Merge remote-tracking branch 'upstream/dev' into plugin-repo

302 files changed, 26433 insertions, 16996 deletions

diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/AbstractBackend.php b/vendor/sabre/dav/lib/CalDAV/Backend/AbstractBackend.php
new file mode 100644
index 000000000..d58b4a46e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/AbstractBackend.php
@@ -0,0 +1,226 @@
+<?php
+
+namespace Sabre\CalDAV\Backend;
+
+use Sabre\VObject;
+use Sabre\CalDAV;
+
+/**
+ * Abstract Calendaring backend. Extend this class to create your own backends.
+ *
+ * Checkout the BackendInterface for all the methods that must be implemented.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+abstract class AbstractBackend implements BackendInterface {
+
+    /**
+     * Updates properties for a calendar.
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documenation for more info and examples.
+     *
+     * @param string $path
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
+     */
+    function updateCalendar($calendarId, \Sabre\DAV\PropPatch $propPatch) {
+
+    }
+
+    /**
+     * Returns a list of calendar objects.
+     *
+     * This method should work identical to getCalendarObject, but instead
+     * return all the calendar objects in the list as an array.
+     *
+     * If the backend supports this, it may allow for some speed-ups.
+     *
+     * @param mixed $calendarId
+     * @param array $uris
+     * @return array
+     */
+    function getMultipleCalendarObjects($calendarId, array $uris) {
+
+        return array_map(function($uri) use ($calendarId) {
+            return $this->getCalendarObject($calendarId, $uri);
+        }, $uris);
+
+    }
+
+    /**
+     * Performs a calendar-query on the contents of this calendar.
+     *
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by \Sabre\CalDAV\CalendarQueryParser.
+     *
+     * Note that it is extremely likely that getCalendarObject for every path
+     * returned from this method will be called almost immediately after. You
+     * may want to anticipate this to speed up these requests.
+     *
+     * This method provides a default implementation, which parses *all* the
+     * iCalendar objects in the specified calendar.
+     *
+     * This default may well be good enough for personal use, and calendars
+     * that aren't very large. But if you anticipate high usage, big calendars
+     * or high loads, you are strongly adviced to optimize certain paths.
+     *
+     * The best way to do so is override this method and to optimize
+     * specifically for 'common filters'.
+     *
+     * Requests that are extremely common are:
+     *   * requests for just VEVENTS
+     *   * requests for just VTODO
+     *   * requests with a time-range-filter on either VEVENT or VTODO.
+     *
+     * ..and combinations of these requests. It may not be worth it to try to
+     * handle every possible situation and just rely on the (relatively
+     * easy to use) CalendarQueryValidator to handle the rest.
+     *
+     * Note that especially time-range-filters may be difficult to parse. A
+     * time-range filter specified on a VEVENT must for instance also handle
+     * recurrence rules correctly.
+     * A good example of how to interprete all these filters can also simply
+     * be found in \Sabre\CalDAV\CalendarQueryFilter. This class is as correct
+     * as possible, so it gives you a good idea on what type of stuff you need
+     * to think of.
+     *
+     * @param mixed $calendarId
+     * @param array $filters
+     * @return array
+     */
+    function calendarQuery($calendarId, array $filters) {
+
+        $result = [];
+        $objects = $this->getCalendarObjects($calendarId);
+
+        foreach ($objects as $object) {
+
+            if ($this->validateFilterForObject($object, $filters)) {
+                $result[] = $object['uri'];
+            }
+
+        }
+
+        return $result;
+
+    }
+
+    /**
+     * This method validates if a filter (as passed to calendarQuery) matches
+     * the given object.
+     *
+     * @param array $object
+     * @param array $filters
+     * @return bool
+     */
+    protected function validateFilterForObject(array $object, array $filters) {
+
+        // Unfortunately, setting the 'calendardata' here is optional. If
+        // it was excluded, we actually need another call to get this as
+        // well.
+        if (!isset($object['calendardata'])) {
+            $object = $this->getCalendarObject($object['calendarid'], $object['uri']);
+        }
+
+        $vObject = VObject\Reader::read($object['calendardata']);
+
+        $validator = new CalDAV\CalendarQueryValidator();
+        $result = $validator->validate($vObject, $filters);
+
+        // Destroy circular references so PHP will GC the object.
+        $vObject->destroy();
+
+        return $result;
+
+    }
+
+    /**
+     * Searches through all of a users calendars and calendar objects to find
+     * an object with a specific UID.
+     *
+     * This method should return the path to this object, relative to the
+     * calendar home, so this path usually only contains two parts:
+     *
+     * calendarpath/objectpath.ics
+     *
+     * If the uid is not found, return null.
+     *
+     * This method should only consider * objects that the principal owns, so
+     * any calendars owned by other principals that also appear in this
+     * collection should be ignored.
+     *
+     * @param string $principalUri
+     * @param string $uid
+     * @return string|null
+     */
+    function getCalendarObjectByUID($principalUri, $uid) {
+
+        // Note: this is a super slow naive implementation of this method. You
+        // are highly recommended to optimize it, if your backend allows it.
+        foreach ($this->getCalendarsForUser($principalUri) as $calendar) {
+
+            // We must ignore calendars owned by other principals.
+            if ($calendar['principaluri'] !== $principalUri) {
+                continue;
+            }
+
+            // Ignore calendars that are shared.
+            if (isset($calendar['{http://sabredav.org/ns}owner-principal']) && $calendar['{http://sabredav.org/ns}owner-principal'] !== $principalUri) {
+                continue;
+            }
+
+            $results = $this->calendarQuery(
+                $calendar['id'],
+                [
+                    'name'         => 'VCALENDAR',
+                    'prop-filters' => [],
+                    'comp-filters' => [
+                        [
+                            'name'           => 'VEVENT',
+                            'is-not-defined' => false,
+                            'time-range'     => null,
+                            'comp-filters'   => [],
+                            'prop-filters'   => [
+                                [
+                                    'name'           => 'UID',
+                                    'is-not-defined' => false,
+                                    'time-range'     => null,
+                                    'text-match'     => [
+                                        'value'            => $uid,
+                                        'negate-condition' => false,
+                                        'collation'        => 'i;octet',
+                                    ],
+                                    'param-filters' => [],
+                                ],
+                            ]
+                        ]
+                    ],
+                ]
+            );
+            if ($results) {
+                // We have a match
+                return $calendar['uri'] . '/' . $results[0];
+            }
+
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/BackendInterface.php b/vendor/sabre/dav/lib/CalDAV/Backend/BackendInterface.php
index 0dc31e5f4..7513fb60d 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/BackendInterface.php
@@ -5,7 +5,7 @@ namespace Sabre\CalDAV\Backend;
 /**
  * Every CalDAV backend must at least implement this interface.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -17,7 +17,7 @@ interface BackendInterface {
      * Every project is an array with the following keys:
      *  * id, a unique id that will be used by other functions to modify the
      *    calendar. This can be the same as the uri or a database key.
-     *  * uri, which the basename of the uri with which the calendar is
+     *  * uri, which is the basename of the uri with which the calendar is
      *    accessed.
      *  * principaluri. The owner of the calendar. Almost always the same as
      *    principalUri passed to this method.
@@ -25,82 +25,74 @@ interface BackendInterface {
      * Furthermore it can contain webdav properties in clark notation. A very
      * common one is '{DAV:}displayname'.
      *
+     * Many clients also require:
+     * {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set
+     * For this property, you can just return an instance of
+     * Sabre\CalDAV\Property\SupportedCalendarComponentSet.
+     *
+     * If you return {http://sabredav.org/ns}read-only and set the value to 1,
+     * ACL will automatically be put in read-only mode.
+     *
      * @param string $principalUri
      * @return array
      */
-    public function getCalendarsForUser($principalUri);
+    function getCalendarsForUser($principalUri);
 
     /**
      * Creates a new calendar for a principal.
      *
-     * If the creation was a success, an id must be returned that can be used to reference
-     * this calendar in other methods, such as updateCalendar.
+     * If the creation was a success, an id must be returned that can be used to
+     * reference this calendar in other methods, such as updateCalendar.
      *
      * @param string $principalUri
      * @param string $calendarUri
      * @param array $properties
      * @return void
      */
-    public function createCalendar($principalUri,$calendarUri,array $properties);
+    function createCalendar($principalUri, $calendarUri, array $properties);
 
     /**
      * Updates properties for a calendar.
      *
-     * The mutations array uses the propertyName in clark-notation as key,
-     * and the array value for the property value. In the case a property
-     * should be deleted, the property value will be null.
-     *
-     * This method must be atomic. If one property cannot be changed, the
-     * entire operation must fail.
-     *
-     * If the operation was successful, true can be returned.
-     * If the operation failed, false can be returned.
-     *
-     * Deletion of a non-existent property is always successful.
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
      *
-     * Lastly, it is optional to return detailed information about any
-     * failures. In this case an array should be returned with the following
-     * structure:
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
      *
-     * array(
-     *   403 => array(
-     *      '{DAV:}displayname' => null,
-     *   ),
-     *   424 => array(
-     *      '{DAV:}owner' => null,
-     *   )
-     * )
+     * Read the PropPatch documentation for more info and examples.
      *
-     * In this example it was forbidden to update {DAV:}displayname.
-     * (403 Forbidden), which in turn also caused {DAV:}owner to fail
-     * (424 Failed Dependency) because the request needs to be atomic.
-     *
-     * @param mixed $calendarId
-     * @param array $mutations
-     * @return bool|array
+     * @param string $path
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
      */
-    public function updateCalendar($calendarId, array $mutations);
+    function updateCalendar($calendarId, \Sabre\DAV\PropPatch $propPatch);
 
     /**
-     * Delete a calendar and all it's objects
+     * Delete a calendar and all its objects
      *
      * @param mixed $calendarId
      * @return void
      */
-    public function deleteCalendar($calendarId);
+    function deleteCalendar($calendarId);
 
     /**
      * Returns all calendar objects within a calendar.
      *
      * Every item contains an array with the following keys:
-     *   * id - unique identifier which will be used for subsequent updates
      *   * calendardata - The iCalendar-compatible calendar data
-     *   * uri - a unique key which will be used to construct the uri. This can be any arbitrary string.
+     *   * uri - a unique key which will be used to construct the uri. This can
+     *     be any arbitrary string, but making sure it ends with '.ics' is a
+     *     good idea. This is only the basename, or filename, not the full
+     *     path.
      *   * lastmodified - a timestamp of the last modification time
      *   * etag - An arbitrary string, surrounded by double-quotes. (e.g.:
-     *   '  "abcdef"')
-     *   * calendarid - The calendarid as it was passed to this function.
+     *   '"abcdef"')
      *   * size - The size of the calendar objects, in bytes.
+     *   * component - optional, a string containing the type of object, such
+     *     as 'vevent' or 'vtodo'. If specified, this will be used to populate
+     *     the Content-Type header.
      *
      * Note that the etag is optional, but it's highly encouraged to return for
      * speed reasons.
@@ -116,12 +108,14 @@ interface BackendInterface {
      * @param mixed $calendarId
      * @return array
      */
-    public function getCalendarObjects($calendarId);
+    function getCalendarObjects($calendarId);
 
     /**
      * Returns information from a single calendar object, based on it's object
      * uri.
      *
+     * The object uri is only the basename, or filename and not a full path.
+     *
      * The returned array must have the same keys as getCalendarObjects. The
      * 'calendardata' object is required here though, while it's not required
      * for getCalendarObjects.
@@ -132,14 +126,30 @@ interface BackendInterface {
      * @param string $objectUri
      * @return array|null
      */
-    public function getCalendarObject($calendarId,$objectUri);
+    function getCalendarObject($calendarId, $objectUri);
+
+    /**
+     * Returns a list of calendar objects.
+     *
+     * This method should work identical to getCalendarObject, but instead
+     * return all the calendar objects in the list as an array.
+     *
+     * If the backend supports this, it may allow for some speed-ups.
+     *
+     * @param mixed $calendarId
+     * @param array $uris
+     * @return array
+     */
+    function getMultipleCalendarObjects($calendarId, array $uris);
 
     /**
      * Creates a new calendar object.
      *
-     * It is possible return an etag from this function, which will be used in
-     * the response to this PUT request. Note that the ETag must be surrounded
-     * by double-quotes.
+     * The object uri is only the basename, or filename and not a full path.
+     *
+     * It is possible to return an etag from this function, which will be used
+     * in the response to this PUT request. Note that the ETag must be
+     * surrounded by double-quotes.
      *
      * However, you should only really return this ETag if you don't mangle the
      * calendar-data. If the result of a subsequent GET to this object is not
@@ -150,11 +160,13 @@ interface BackendInterface {
      * @param string $calendarData
      * @return string|null
      */
-    public function createCalendarObject($calendarId,$objectUri,$calendarData);
+    function createCalendarObject($calendarId, $objectUri, $calendarData);
 
     /**
      * Updates an existing calendarobject, based on it's uri.
      *
+     * The object uri is only the basename, or filename and not a full path.
+     *
      * It is possible return an etag from this function, which will be used in
      * the response to this PUT request. Note that the ETag must be surrounded
      * by double-quotes.
@@ -168,16 +180,18 @@ interface BackendInterface {
      * @param string $calendarData
      * @return string|null
      */
-    public function updateCalendarObject($calendarId,$objectUri,$calendarData);
+    function updateCalendarObject($calendarId, $objectUri, $calendarData);
 
     /**
      * Deletes an existing calendar object.
      *
+     * The object uri is only the basename, or filename and not a full path.
+     *
      * @param mixed $calendarId
      * @param string $objectUri
      * @return void
      */
-    public function deleteCalendarObject($calendarId,$objectUri);
+    function deleteCalendarObject($calendarId, $objectUri);
 
     /**
      * Performs a calendar-query on the contents of this calendar.
@@ -228,6 +242,27 @@ interface BackendInterface {
      * @param array $filters
      * @return array
      */
-    public function calendarQuery($calendarId, array $filters);
+    function calendarQuery($calendarId, array $filters);
+
+    /**
+     * Searches through all of a users calendars and calendar objects to find
+     * an object with a specific UID.
+     *
+     * This method should return the path to this object, relative to the
+     * calendar home, so this path usually only contains two parts:
+     *
+     * calendarpath/objectpath.ics
+     *
+     * If the uid is not found, return null.
+     *
+     * This method should only consider * objects that the principal owns, so
+     * any calendars owned by other principals that also appear in this
+     * collection should be ignored.
+     *
+     * @param string $principalUri
+     * @param string $uid
+     * @return string|null
+     */
+    function getCalendarObjectByUID($principalUri, $uid);
 
 }
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/NotificationSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/NotificationSupport.php
index 96533ad6a..19b9b22a7 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/NotificationSupport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/NotificationSupport.php
@@ -2,6 +2,8 @@
 
 namespace Sabre\CalDAV\Backend;
 
+use Sabre\CalDAV\Xml\Notification\NotificationInterface;
+
 /**
  * Adds caldav notification support to a backend.
  *
@@ -16,7 +18,7 @@ namespace Sabre\CalDAV\Backend;
  *
  * The primary usecase is to allow for calendar-sharing.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -25,13 +27,10 @@ interface NotificationSupport extends BackendInterface {
     /**
      * Returns a list of notifications for a given principal url.
      *
-     * The returned array should only consist of implementations of
-     * \Sabre\CalDAV\Notifications\INotificationType.
-     *
      * @param string $principalUri
-     * @return array
+     * @return NotificationInterface[]
      */
-    public function getNotificationsForPrincipal($principalUri);
+    function getNotificationsForPrincipal($principalUri);
 
     /**
      * This deletes a specific notifcation.
@@ -39,9 +38,9 @@ interface NotificationSupport extends BackendInterface {
      * This may be called by a client once it deems a notification handled.
      *
      * @param string $principalUri
-     * @param \Sabre\CalDAV\Notifications\INotificationType $notification
+     * @param NotificationInterface $notification
      * @return void
      */
-    public function deleteNotification($principalUri, \Sabre\CalDAV\Notifications\INotificationType $notification);
+    function deleteNotification($principalUri, NotificationInterface $notification);
 
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php b/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php
new file mode 100644
index 000000000..76b69dc6e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php
@@ -0,0 +1,1210 @@
+<?php
+
+namespace Sabre\CalDAV\Backend;
+
+use Sabre\VObject;
+use Sabre\CalDAV;
+use Sabre\DAV;
+use Sabre\DAV\Exception\Forbidden;
+
+/**
+ * PDO CalDAV backend
+ *
+ * This backend is used to store calendar-data in a PDO database, such as
+ * sqlite or MySQL
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PDO extends AbstractBackend implements SyncSupport, SubscriptionSupport, SchedulingSupport {
+
+    /**
+     * We need to specify a max date, because we need to stop *somewhere*
+     *
+     * On 32 bit system the maximum for a signed integer is 2147483647, so
+     * MAX_DATE cannot be higher than date('Y-m-d', 2147483647) which results
+     * in 2038-01-19 to avoid problems when the date is converted
+     * to a unix timestamp.
+     */
+    const MAX_DATE = '2038-01-01';
+
+    /**
+     * pdo
+     *
+     * @var \PDO
+     */
+    protected $pdo;
+
+    /**
+     * The table name that will be used for calendars
+     *
+     * @var string
+     */
+    public $calendarTableName = 'calendars';
+
+    /**
+     * The table name that will be used for calendar objects
+     *
+     * @var string
+     */
+    public $calendarObjectTableName = 'calendarobjects';
+
+    /**
+     * The table name that will be used for tracking changes in calendars.
+     *
+     * @var string
+     */
+    public $calendarChangesTableName = 'calendarchanges';
+
+    /**
+     * The table name that will be used inbox items.
+     *
+     * @var string
+     */
+    public $schedulingObjectTableName = 'schedulingobjects';
+
+    /**
+     * The table name that will be used for calendar subscriptions.
+     *
+     * @var string
+     */
+    public $calendarSubscriptionsTableName = 'calendarsubscriptions';
+
+    /**
+     * List of CalDAV properties, and how they map to database fieldnames
+     * Add your own properties by simply adding on to this array.
+     *
+     * Note that only string-based properties are supported here.
+     *
+     * @var array
+     */
+    public $propertyMap = [
+        '{DAV:}displayname'                                   => 'displayname',
+        '{urn:ietf:params:xml:ns:caldav}calendar-description' => 'description',
+        '{urn:ietf:params:xml:ns:caldav}calendar-timezone'    => 'timezone',
+        '{http://apple.com/ns/ical/}calendar-order'           => 'calendarorder',
+        '{http://apple.com/ns/ical/}calendar-color'           => 'calendarcolor',
+    ];
+
+    /**
+     * List of subscription properties, and how they map to database fieldnames.
+     *
+     * @var array
+     */
+    public $subscriptionPropertyMap = [
+        '{DAV:}displayname'                                           => 'displayname',
+        '{http://apple.com/ns/ical/}refreshrate'                      => 'refreshrate',
+        '{http://apple.com/ns/ical/}calendar-order'                   => 'calendarorder',
+        '{http://apple.com/ns/ical/}calendar-color'                   => 'calendarcolor',
+        '{http://calendarserver.org/ns/}subscribed-strip-todos'       => 'striptodos',
+        '{http://calendarserver.org/ns/}subscribed-strip-alarms'      => 'stripalarms',
+        '{http://calendarserver.org/ns/}subscribed-strip-attachments' => 'stripattachments',
+    ];
+
+    /**
+     * Creates the backend
+     *
+     * @param \PDO $pdo
+     */
+    function __construct(\PDO $pdo) {
+
+        $this->pdo = $pdo;
+
+    }
+
+    /**
+     * Returns a list of calendars for a principal.
+     *
+     * Every project is an array with the following keys:
+     *  * id, a unique id that will be used by other functions to modify the
+     *    calendar. This can be the same as the uri or a database key.
+     *  * uri. This is just the 'base uri' or 'filename' of the calendar.
+     *  * principaluri. The owner of the calendar. Almost always the same as
+     *    principalUri passed to this method.
+     *
+     * Furthermore it can contain webdav properties in clark notation. A very
+     * common one is '{DAV:}displayname'.
+     *
+     * Many clients also require:
+     * {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set
+     * For this property, you can just return an instance of
+     * Sabre\CalDAV\Xml\Property\SupportedCalendarComponentSet.
+     *
+     * If you return {http://sabredav.org/ns}read-only and set the value to 1,
+     * ACL will automatically be put in read-only mode.
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    function getCalendarsForUser($principalUri) {
+
+        $fields = array_values($this->propertyMap);
+        $fields[] = 'id';
+        $fields[] = 'uri';
+        $fields[] = 'synctoken';
+        $fields[] = 'components';
+        $fields[] = 'principaluri';
+        $fields[] = 'transparent';
+
+        // Making fields a comma-delimited list
+        $fields = implode(', ', $fields);
+        $stmt = $this->pdo->prepare("SELECT " . $fields . " FROM " . $this->calendarTableName . " WHERE principaluri = ? ORDER BY calendarorder ASC");
+        $stmt->execute([$principalUri]);
+
+        $calendars = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+
+            $components = [];
+            if ($row['components']) {
+                $components = explode(',', $row['components']);
+            }
+
+            $calendar = [
+                'id'                                                                 => $row['id'],
+                'uri'                                                                => $row['uri'],
+                'principaluri'                                                       => $row['principaluri'],
+                '{' . CalDAV\Plugin::NS_CALENDARSERVER . '}getctag'                  => 'http://sabre.io/ns/sync/' . ($row['synctoken'] ? $row['synctoken'] : '0'),
+                '{http://sabredav.org/ns}sync-token'                                 => $row['synctoken'] ? $row['synctoken'] : '0',
+                '{' . CalDAV\Plugin::NS_CALDAV . '}supported-calendar-component-set' => new CalDAV\Xml\Property\SupportedCalendarComponentSet($components),
+                '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp'         => new CalDAV\Xml\Property\ScheduleCalendarTransp($row['transparent'] ? 'transparent' : 'opaque'),
+            ];
+
+
+            foreach ($this->propertyMap as $xmlName => $dbName) {
+                $calendar[$xmlName] = $row[$dbName];
+            }
+
+            $calendars[] = $calendar;
+
+        }
+
+        return $calendars;
+
+    }
+
+    /**
+     * Creates a new calendar for a principal.
+     *
+     * If the creation was a success, an id must be returned that can be used
+     * to reference this calendar in other methods, such as updateCalendar.
+     *
+     * @param string $principalUri
+     * @param string $calendarUri
+     * @param array $properties
+     * @return string
+     */
+    function createCalendar($principalUri, $calendarUri, array $properties) {
+
+        $fieldNames = [
+            'principaluri',
+            'uri',
+            'synctoken',
+            'transparent',
+        ];
+        $values = [
+            ':principaluri' => $principalUri,
+            ':uri'          => $calendarUri,
+            ':synctoken'    => 1,
+            ':transparent'  => 0,
+        ];
+
+        // Default value
+        $sccs = '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set';
+        $fieldNames[] = 'components';
+        if (!isset($properties[$sccs])) {
+            $values[':components'] = 'VEVENT,VTODO';
+        } else {
+            if (!($properties[$sccs] instanceof CalDAV\Xml\Property\SupportedCalendarComponentSet)) {
+                throw new DAV\Exception('The ' . $sccs . ' property must be of type: \Sabre\CalDAV\Xml\Property\SupportedCalendarComponentSet');
+            }
+            $values[':components'] = implode(',', $properties[$sccs]->getValue());
+        }
+        $transp = '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp';
+        if (isset($properties[$transp])) {
+            $values[':transparent'] = $properties[$transp]->getValue() === 'transparent';
+        }
+
+        foreach ($this->propertyMap as $xmlName => $dbName) {
+            if (isset($properties[$xmlName])) {
+
+                $values[':' . $dbName] = $properties[$xmlName];
+                $fieldNames[] = $dbName;
+            }
+        }
+
+        $stmt = $this->pdo->prepare("INSERT INTO " . $this->calendarTableName . " (" . implode(', ', $fieldNames) . ") VALUES (" . implode(', ', array_keys($values)) . ")");
+        $stmt->execute($values);
+
+        return $this->pdo->lastInsertId();
+
+    }
+
+    /**
+     * Updates properties for a calendar.
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documenation for more info and examples.
+     *
+     * @param string $calendarId
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
+     */
+    function updateCalendar($calendarId, \Sabre\DAV\PropPatch $propPatch) {
+
+        $supportedProperties = array_keys($this->propertyMap);
+        $supportedProperties[] = '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp';
+
+        $propPatch->handle($supportedProperties, function($mutations) use ($calendarId) {
+            $newValues = [];
+            foreach ($mutations as $propertyName => $propertyValue) {
+
+                switch ($propertyName) {
+                    case '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp' :
+                        $fieldName = 'transparent';
+                        $newValues[$fieldName] = $propertyValue->getValue() === 'transparent';
+                        break;
+                    default :
+                        $fieldName = $this->propertyMap[$propertyName];
+                        $newValues[$fieldName] = $propertyValue;
+                        break;
+                }
+
+            }
+            $valuesSql = [];
+            foreach ($newValues as $fieldName => $value) {
+                $valuesSql[] = $fieldName . ' = ?';
+            }
+
+            $stmt = $this->pdo->prepare("UPDATE " . $this->calendarTableName . " SET " . implode(', ', $valuesSql) . " WHERE id = ?");
+            $newValues['id'] = $calendarId;
+            $stmt->execute(array_values($newValues));
+
+            $this->addChange($calendarId, "", 2);
+
+            return true;
+
+        });
+
+    }
+
+    /**
+     * Delete a calendar and all it's objects
+     *
+     * @param string $calendarId
+     * @return void
+     */
+    function deleteCalendar($calendarId) {
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarObjectTableName . ' WHERE calendarid = ?');
+        $stmt->execute([$calendarId]);
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarTableName . ' WHERE id = ?');
+        $stmt->execute([$calendarId]);
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarChangesTableName . ' WHERE calendarid = ?');
+        $stmt->execute([$calendarId]);
+
+    }
+
+    /**
+     * Returns all calendar objects within a calendar.
+     *
+     * Every item contains an array with the following keys:
+     *   * calendardata - The iCalendar-compatible calendar data
+     *   * uri - a unique key which will be used to construct the uri. This can
+     *     be any arbitrary string, but making sure it ends with '.ics' is a
+     *     good idea. This is only the basename, or filename, not the full
+     *     path.
+     *   * lastmodified - a timestamp of the last modification time
+     *   * etag - An arbitrary string, surrounded by double-quotes. (e.g.:
+     *   '  "abcdef"')
+     *   * size - The size of the calendar objects, in bytes.
+     *   * component - optional, a string containing the type of object, such
+     *     as 'vevent' or 'vtodo'. If specified, this will be used to populate
+     *     the Content-Type header.
+     *
+     * Note that the etag is optional, but it's highly encouraged to return for
+     * speed reasons.
+     *
+     * The calendardata is also optional. If it's not returned
+     * 'getCalendarObject' will be called later, which *is* expected to return
+     * calendardata.
+     *
+     * If neither etag or size are specified, the calendardata will be
+     * used/fetched to determine these numbers. If both are specified the
+     * amount of times this is needed is reduced by a great degree.
+     *
+     * @param string $calendarId
+     * @return array
+     */
+    function getCalendarObjects($calendarId) {
+
+        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, calendarid, size, componenttype FROM ' . $this->calendarObjectTableName . ' WHERE calendarid = ?');
+        $stmt->execute([$calendarId]);
+
+        $result = [];
+        foreach ($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
+            $result[] = [
+                'id'           => $row['id'],
+                'uri'          => $row['uri'],
+                'lastmodified' => $row['lastmodified'],
+                'etag'         => '"' . $row['etag'] . '"',
+                'calendarid'   => $row['calendarid'],
+                'size'         => (int)$row['size'],
+                'component'    => strtolower($row['componenttype']),
+            ];
+        }
+
+        return $result;
+
+    }
+
+    /**
+     * Returns information from a single calendar object, based on it's object
+     * uri.
+     *
+     * The object uri is only the basename, or filename and not a full path.
+     *
+     * The returned array must have the same keys as getCalendarObjects. The
+     * 'calendardata' object is required here though, while it's not required
+     * for getCalendarObjects.
+     *
+     * This method must return null if the object did not exist.
+     *
+     * @param string $calendarId
+     * @param string $objectUri
+     * @return array|null
+     */
+    function getCalendarObject($calendarId, $objectUri) {
+
+        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, calendarid, size, calendardata, componenttype FROM ' . $this->calendarObjectTableName . ' WHERE calendarid = ? AND uri = ?');
+        $stmt->execute([$calendarId, $objectUri]);
+        $row = $stmt->fetch(\PDO::FETCH_ASSOC);
+
+        if (!$row) return null;
+
+        return [
+            'id'            => $row['id'],
+            'uri'           => $row['uri'],
+            'lastmodified'  => $row['lastmodified'],
+            'etag'          => '"' . $row['etag'] . '"',
+            'calendarid'    => $row['calendarid'],
+            'size'          => (int)$row['size'],
+            'calendardata'  => $row['calendardata'],
+            'component'     => strtolower($row['componenttype']),
+         ];
+
+    }
+
+    /**
+     * Returns a list of calendar objects.
+     *
+     * This method should work identical to getCalendarObject, but instead
+     * return all the calendar objects in the list as an array.
+     *
+     * If the backend supports this, it may allow for some speed-ups.
+     *
+     * @param mixed $calendarId
+     * @param array $uris
+     * @return array
+     */
+    function getMultipleCalendarObjects($calendarId, array $uris) {
+
+        $query = 'SELECT id, uri, lastmodified, etag, calendarid, size, calendardata, componenttype FROM ' . $this->calendarObjectTableName . ' WHERE calendarid = ? AND uri IN (';
+        // Inserting a whole bunch of question marks
+        $query .= implode(',', array_fill(0, count($uris), '?'));
+        $query .= ')';
+
+        $stmt = $this->pdo->prepare($query);
+        $stmt->execute(array_merge([$calendarId], $uris));
+
+        $result = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+
+            $result[] = [
+                'id'           => $row['id'],
+                'uri'          => $row['uri'],
+                'lastmodified' => $row['lastmodified'],
+                'etag'         => '"' . $row['etag'] . '"',
+                'calendarid'   => $row['calendarid'],
+                'size'         => (int)$row['size'],
+                'calendardata' => $row['calendardata'],
+                'component'    => strtolower($row['componenttype']),
+            ];
+
+        }
+        return $result;
+
+    }
+
+
+    /**
+     * Creates a new calendar object.
+     *
+     * The object uri is only the basename, or filename and not a full path.
+     *
+     * It is possible return an etag from this function, which will be used in
+     * the response to this PUT request. Note that the ETag must be surrounded
+     * by double-quotes.
+     *
+     * However, you should only really return this ETag if you don't mangle the
+     * calendar-data. If the result of a subsequent GET to this object is not
+     * the exact same as this request body, you should omit the ETag.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param string $calendarData
+     * @return string|null
+     */
+    function createCalendarObject($calendarId, $objectUri, $calendarData) {
+
+        $extraData = $this->getDenormalizedData($calendarData);
+
+        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->calendarObjectTableName . ' (calendarid, uri, calendardata, lastmodified, etag, size, componenttype, firstoccurence, lastoccurence, uid) VALUES (?,?,?,?,?,?,?,?,?,?)');
+        $stmt->execute([
+            $calendarId,
+            $objectUri,
+            $calendarData,
+            time(),
+            $extraData['etag'],
+            $extraData['size'],
+            $extraData['componentType'],
+            $extraData['firstOccurence'],
+            $extraData['lastOccurence'],
+            $extraData['uid'],
+        ]);
+        $this->addChange($calendarId, $objectUri, 1);
+
+        return '"' . $extraData['etag'] . '"';
+
+    }
+
+    /**
+     * Updates an existing calendarobject, based on it's uri.
+     *
+     * The object uri is only the basename, or filename and not a full path.
+     *
+     * It is possible return an etag from this function, which will be used in
+     * the response to this PUT request. Note that the ETag must be surrounded
+     * by double-quotes.
+     *
+     * However, you should only really return this ETag if you don't mangle the
+     * calendar-data. If the result of a subsequent GET to this object is not
+     * the exact same as this request body, you should omit the ETag.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param string $calendarData
+     * @return string|null
+     */
+    function updateCalendarObject($calendarId, $objectUri, $calendarData) {
+
+        $extraData = $this->getDenormalizedData($calendarData);
+
+        $stmt = $this->pdo->prepare('UPDATE ' . $this->calendarObjectTableName . ' SET calendardata = ?, lastmodified = ?, etag = ?, size = ?, componenttype = ?, firstoccurence = ?, lastoccurence = ?, uid = ? WHERE calendarid = ? AND uri = ?');
+        $stmt->execute([$calendarData, time(), $extraData['etag'], $extraData['size'], $extraData['componentType'], $extraData['firstOccurence'], $extraData['lastOccurence'], $extraData['uid'], $calendarId, $objectUri]);
+
+        $this->addChange($calendarId, $objectUri, 2);
+
+        return '"' . $extraData['etag'] . '"';
+
+    }
+
+    /**
+     * Parses some information from calendar objects, used for optimized
+     * calendar-queries.
+     *
+     * Returns an array with the following keys:
+     *   * etag - An md5 checksum of the object without the quotes.
+     *   * size - Size of the object in bytes
+     *   * componentType - VEVENT, VTODO or VJOURNAL
+     *   * firstOccurence
+     *   * lastOccurence
+     *   * uid - value of the UID property
+     *
+     * @param string $calendarData
+     * @return array
+     */
+    protected function getDenormalizedData($calendarData) {
+
+        $vObject = VObject\Reader::read($calendarData);
+        $componentType = null;
+        $component = null;
+        $firstOccurence = null;
+        $lastOccurence = null;
+        $uid = null;
+        foreach ($vObject->getComponents() as $component) {
+            if ($component->name !== 'VTIMEZONE') {
+                $componentType = $component->name;
+                $uid = (string)$component->UID;
+                break;
+            }
+        }
+        if (!$componentType) {
+            throw new \Sabre\DAV\Exception\BadRequest('Calendar objects must have a VJOURNAL, VEVENT or VTODO component');
+        }
+        if ($componentType === 'VEVENT') {
+            $firstOccurence = $component->DTSTART->getDateTime()->getTimeStamp();
+            // Finding the last occurence is a bit harder
+            if (!isset($component->RRULE)) {
+                if (isset($component->DTEND)) {
+                    $lastOccurence = $component->DTEND->getDateTime()->getTimeStamp();
+                } elseif (isset($component->DURATION)) {
+                    $endDate = clone $component->DTSTART->getDateTime();
+                    $endDate = $endDate->add(VObject\DateTimeParser::parse($component->DURATION->getValue()));
+                    $lastOccurence = $endDate->getTimeStamp();
+                } elseif (!$component->DTSTART->hasTime()) {
+                    $endDate = clone $component->DTSTART->getDateTime();
+                    $endDate = $endDate->modify('+1 day');
+                    $lastOccurence = $endDate->getTimeStamp();
+                } else {
+                    $lastOccurence = $firstOccurence;
+                }
+            } else {
+                $it = new VObject\Recur\EventIterator($vObject, (string)$component->UID);
+                $maxDate = new \DateTime(self::MAX_DATE);
+                if ($it->isInfinite()) {
+                    $lastOccurence = $maxDate->getTimeStamp();
+                } else {
+                    $end = $it->getDtEnd();
+                    while ($it->valid() && $end < $maxDate) {
+                        $end = $it->getDtEnd();
+                        $it->next();
+
+                    }
+                    $lastOccurence = $end->getTimeStamp();
+                }
+
+            }
+        }
+
+        // Destroy circular references to PHP will GC the object.
+        $vObject->destroy();
+
+        return [
+            'etag'           => md5($calendarData),
+            'size'           => strlen($calendarData),
+            'componentType'  => $componentType,
+            'firstOccurence' => $firstOccurence,
+            'lastOccurence'  => $lastOccurence,
+            'uid'            => $uid,
+        ];
+
+    }
+
+    /**
+     * Deletes an existing calendar object.
+     *
+     * The object uri is only the basename, or filename and not a full path.
+     *
+     * @param string $calendarId
+     * @param string $objectUri
+     * @return void
+     */
+    function deleteCalendarObject($calendarId, $objectUri) {
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarObjectTableName . ' WHERE calendarid = ? AND uri = ?');
+        $stmt->execute([$calendarId, $objectUri]);
+
+        $this->addChange($calendarId, $objectUri, 3);
+
+    }
+
+    /**
+     * Performs a calendar-query on the contents of this calendar.
+     *
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by \Sabre\CalDAV\CalendarQueryParser.
+     *
+     * Note that it is extremely likely that getCalendarObject for every path
+     * returned from this method will be called almost immediately after. You
+     * may want to anticipate this to speed up these requests.
+     *
+     * This method provides a default implementation, which parses *all* the
+     * iCalendar objects in the specified calendar.
+     *
+     * This default may well be good enough for personal use, and calendars
+     * that aren't very large. But if you anticipate high usage, big calendars
+     * or high loads, you are strongly adviced to optimize certain paths.
+     *
+     * The best way to do so is override this method and to optimize
+     * specifically for 'common filters'.
+     *
+     * Requests that are extremely common are:
+     *   * requests for just VEVENTS
+     *   * requests for just VTODO
+     *   * requests with a time-range-filter on a VEVENT.
+     *
+     * ..and combinations of these requests. It may not be worth it to try to
+     * handle every possible situation and just rely on the (relatively
+     * easy to use) CalendarQueryValidator to handle the rest.
+     *
+     * Note that especially time-range-filters may be difficult to parse. A
+     * time-range filter specified on a VEVENT must for instance also handle
+     * recurrence rules correctly.
+     * A good example of how to interprete all these filters can also simply
+     * be found in \Sabre\CalDAV\CalendarQueryFilter. This class is as correct
+     * as possible, so it gives you a good idea on what type of stuff you need
+     * to think of.
+     *
+     * This specific implementation (for the PDO) backend optimizes filters on
+     * specific components, and VEVENT time-ranges.
+     *
+     * @param string $calendarId
+     * @param array $filters
+     * @return array
+     */
+    function calendarQuery($calendarId, array $filters) {
+
+        $componentType = null;
+        $requirePostFilter = true;
+        $timeRange = null;
+
+        // if no filters were specified, we don't need to filter after a query
+        if (!$filters['prop-filters'] && !$filters['comp-filters']) {
+            $requirePostFilter = false;
+        }
+
+        // Figuring out if there's a component filter
+        if (count($filters['comp-filters']) > 0 && !$filters['comp-filters'][0]['is-not-defined']) {
+            $componentType = $filters['comp-filters'][0]['name'];
+
+            // Checking if we need post-filters
+            if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['time-range'] && !$filters['comp-filters'][0]['prop-filters']) {
+                $requirePostFilter = false;
+            }
+            // There was a time-range filter
+            if ($componentType == 'VEVENT' && isset($filters['comp-filters'][0]['time-range'])) {
+                $timeRange = $filters['comp-filters'][0]['time-range'];
+
+                // If start time OR the end time is not specified, we can do a
+                // 100% accurate mysql query.
+                if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['prop-filters'] && (!$timeRange['start'] || !$timeRange['end'])) {
+                    $requirePostFilter = false;
+                }
+            }
+
+        }
+
+        if ($requirePostFilter) {
+            $query = "SELECT uri, calendardata FROM " . $this->calendarObjectTableName . " WHERE calendarid = :calendarid";
+        } else {
+            $query = "SELECT uri FROM " . $this->calendarObjectTableName . " WHERE calendarid = :calendarid";
+        }
+
+        $values = [
+            'calendarid' => $calendarId,
+        ];
+
+        if ($componentType) {
+            $query .= " AND componenttype = :componenttype";
+            $values['componenttype'] = $componentType;
+        }
+
+        if ($timeRange && $timeRange['start']) {
+            $query .= " AND lastoccurence > :startdate";
+            $values['startdate'] = $timeRange['start']->getTimeStamp();
+        }
+        if ($timeRange && $timeRange['end']) {
+            $query .= " AND firstoccurence < :enddate";
+            $values['enddate'] = $timeRange['end']->getTimeStamp();
+        }
+
+        $stmt = $this->pdo->prepare($query);
+        $stmt->execute($values);
+
+        $result = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            if ($requirePostFilter) {
+                if (!$this->validateFilterForObject($row, $filters)) {
+                    continue;
+                }
+            }
+            $result[] = $row['uri'];
+
+        }
+
+        return $result;
+
+    }
+
+    /**
+     * Searches through all of a users calendars and calendar objects to find
+     * an object with a specific UID.
+     *
+     * This method should return the path to this object, relative to the
+     * calendar home, so this path usually only contains two parts:
+     *
+     * calendarpath/objectpath.ics
+     *
+     * If the uid is not found, return null.
+     *
+     * This method should only consider * objects that the principal owns, so
+     * any calendars owned by other principals that also appear in this
+     * collection should be ignored.
+     *
+     * @param string $principalUri
+     * @param string $uid
+     * @return string|null
+     */
+    function getCalendarObjectByUID($principalUri, $uid) {
+
+        $query = <<<SQL
+SELECT
+    calendars.uri AS calendaruri, calendarobjects.uri as objecturi
+FROM
+    $this->calendarObjectTableName AS calendarobjects
+LEFT JOIN
+    $this->calendarTableName AS calendars
+    ON calendarobjects.calendarid = calendars.id
+WHERE
+    calendars.principaluri = ?
+    AND
+    calendarobjects.uid = ?
+SQL;
+
+        $stmt = $this->pdo->prepare($query);
+        $stmt->execute([$principalUri, $uid]);
+
+        if ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            return $row['calendaruri'] . '/' . $row['objecturi'];
+        }
+
+    }
+
+    /**
+     * The getChanges method returns all the changes that have happened, since
+     * the specified syncToken in the specified calendar.
+     *
+     * This function should return an array, such as the following:
+     *
+     * [
+     *   'syncToken' => 'The current synctoken',
+     *   'added'   => [
+     *      'new.txt',
+     *   ],
+     *   'modified'   => [
+     *      'modified.txt',
+     *   ],
+     *   'deleted' => [
+     *      'foo.php.bak',
+     *      'old.txt'
+     *   ]
+     * ];
+     *
+     * The returned syncToken property should reflect the *current* syncToken
+     * of the calendar, as reported in the {http://sabredav.org/ns}sync-token
+     * property this is needed here too, to ensure the operation is atomic.
+     *
+     * If the $syncToken argument is specified as null, this is an initial
+     * sync, and all members should be reported.
+     *
+     * The modified property is an array of nodenames that have changed since
+     * the last token.
+     *
+     * The deleted property is an array with nodenames, that have been deleted
+     * from collection.
+     *
+     * The $syncLevel argument is basically the 'depth' of the report. If it's
+     * 1, you only have to report changes that happened only directly in
+     * immediate descendants. If it's 2, it should also include changes from
+     * the nodes below the child collections. (grandchildren)
+     *
+     * The $limit argument allows a client to specify how many results should
+     * be returned at most. If the limit is not specified, it should be treated
+     * as infinite.
+     *
+     * If the limit (infinite or not) is higher than you're willing to return,
+     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     *
+     * If the syncToken is expired (due to data cleanup) or unknown, you must
+     * return null.
+     *
+     * The limit is 'suggestive'. You are free to ignore it.
+     *
+     * @param string $calendarId
+     * @param string $syncToken
+     * @param int $syncLevel
+     * @param int $limit
+     * @return array
+     */
+    function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null) {
+
+        // Current synctoken
+        $stmt = $this->pdo->prepare('SELECT synctoken FROM ' . $this->calendarTableName . ' WHERE id = ?');
+        $stmt->execute([ $calendarId ]);
+        $currentToken = $stmt->fetchColumn(0);
+
+        if (is_null($currentToken)) return null;
+
+        $result = [
+            'syncToken' => $currentToken,
+            'added'     => [],
+            'modified'  => [],
+            'deleted'   => [],
+        ];
+
+        if ($syncToken) {
+
+            $query = "SELECT uri, operation FROM " . $this->calendarChangesTableName . " WHERE synctoken >= ? AND synctoken < ? AND calendarid = ? ORDER BY synctoken";
+            if ($limit > 0) $query .= " LIMIT " . (int)$limit;
+
+            // Fetching all changes
+            $stmt = $this->pdo->prepare($query);
+            $stmt->execute([$syncToken, $currentToken, $calendarId]);
+
+            $changes = [];
+
+            // This loop ensures that any duplicates are overwritten, only the
+            // last change on a node is relevant.
+            while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+
+                $changes[$row['uri']] = $row['operation'];
+
+            }
+
+            foreach ($changes as $uri => $operation) {
+
+                switch ($operation) {
+                    case 1 :
+                        $result['added'][] = $uri;
+                        break;
+                    case 2 :
+                        $result['modified'][] = $uri;
+                        break;
+                    case 3 :
+                        $result['deleted'][] = $uri;
+                        break;
+                }
+
+            }
+        } else {
+            // No synctoken supplied, this is the initial sync.
+            $query = "SELECT uri FROM " . $this->calendarObjectTableName . " WHERE calendarid = ?";
+            $stmt = $this->pdo->prepare($query);
+            $stmt->execute([$calendarId]);
+
+            $result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
+        }
+        return $result;
+
+    }
+
+    /**
+     * Adds a change record to the calendarchanges table.
+     *
+     * @param mixed $calendarId
+     * @param string $objectUri
+     * @param int $operation 1 = add, 2 = modify, 3 = delete.
+     * @return void
+     */
+    protected function addChange($calendarId, $objectUri, $operation) {
+
+        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->calendarChangesTableName . ' (uri, synctoken, calendarid, operation) SELECT ?, synctoken, ?, ? FROM ' . $this->calendarTableName . ' WHERE id = ?');
+        $stmt->execute([
+            $objectUri,
+            $calendarId,
+            $operation,
+            $calendarId
+        ]);
+        $stmt = $this->pdo->prepare('UPDATE ' . $this->calendarTableName . ' SET synctoken = synctoken + 1 WHERE id = ?');
+        $stmt->execute([
+            $calendarId
+        ]);
+
+    }
+
+    /**
+     * Returns a list of subscriptions for a principal.
+     *
+     * Every subscription is an array with the following keys:
+     *  * id, a unique id that will be used by other functions to modify the
+     *    subscription. This can be the same as the uri or a database key.
+     *  * uri. This is just the 'base uri' or 'filename' of the subscription.
+     *  * principaluri. The owner of the subscription. Almost always the same as
+     *    principalUri passed to this method.
+     *  * source. Url to the actual feed
+     *
+     * Furthermore, all the subscription info must be returned too:
+     *
+     * 1. {DAV:}displayname
+     * 2. {http://apple.com/ns/ical/}refreshrate
+     * 3. {http://calendarserver.org/ns/}subscribed-strip-todos (omit if todos
+     *    should not be stripped).
+     * 4. {http://calendarserver.org/ns/}subscribed-strip-alarms (omit if alarms
+     *    should not be stripped).
+     * 5. {http://calendarserver.org/ns/}subscribed-strip-attachments (omit if
+     *    attachments should not be stripped).
+     * 7. {http://apple.com/ns/ical/}calendar-color
+     * 8. {http://apple.com/ns/ical/}calendar-order
+     * 9. {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set
+     *    (should just be an instance of
+     *    Sabre\CalDAV\Property\SupportedCalendarComponentSet, with a bunch of
+     *    default components).
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    function getSubscriptionsForUser($principalUri) {
+
+        $fields = array_values($this->subscriptionPropertyMap);
+        $fields[] = 'id';
+        $fields[] = 'uri';
+        $fields[] = 'source';
+        $fields[] = 'principaluri';
+        $fields[] = 'lastmodified';
+
+        // Making fields a comma-delimited list
+        $fields = implode(', ', $fields);
+        $stmt = $this->pdo->prepare("SELECT " . $fields . " FROM " . $this->calendarSubscriptionsTableName . " WHERE principaluri = ? ORDER BY calendarorder ASC");
+        $stmt->execute([$principalUri]);
+
+        $subscriptions = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+
+            $subscription = [
+                'id'           => $row['id'],
+                'uri'          => $row['uri'],
+                'principaluri' => $row['principaluri'],
+                'source'       => $row['source'],
+                'lastmodified' => $row['lastmodified'],
+
+                '{' . CalDAV\Plugin::NS_CALDAV . '}supported-calendar-component-set' => new CalDAV\Xml\Property\SupportedCalendarComponentSet(['VTODO', 'VEVENT']),
+            ];
+
+            foreach ($this->subscriptionPropertyMap as $xmlName => $dbName) {
+                if (!is_null($row[$dbName])) {
+                    $subscription[$xmlName] = $row[$dbName];
+                }
+            }
+
+            $subscriptions[] = $subscription;
+
+        }
+
+        return $subscriptions;
+
+    }
+
+    /**
+     * Creates a new subscription for a principal.
+     *
+     * If the creation was a success, an id must be returned that can be used to reference
+     * this subscription in other methods, such as updateSubscription.
+     *
+     * @param string $principalUri
+     * @param string $uri
+     * @param array $properties
+     * @return mixed
+     */
+    function createSubscription($principalUri, $uri, array $properties) {
+
+        $fieldNames = [
+            'principaluri',
+            'uri',
+            'source',
+            'lastmodified',
+        ];
+
+        if (!isset($properties['{http://calendarserver.org/ns/}source'])) {
+            throw new Forbidden('The {http://calendarserver.org/ns/}source property is required when creating subscriptions');
+        }
+
+        $values = [
+            ':principaluri' => $principalUri,
+            ':uri'          => $uri,
+            ':source'       => $properties['{http://calendarserver.org/ns/}source']->getHref(),
+            ':lastmodified' => time(),
+        ];
+
+        foreach ($this->subscriptionPropertyMap as $xmlName => $dbName) {
+            if (isset($properties[$xmlName])) {
+
+                $values[':' . $dbName] = $properties[$xmlName];
+                $fieldNames[] = $dbName;
+            }
+        }
+
+        $stmt = $this->pdo->prepare("INSERT INTO " . $this->calendarSubscriptionsTableName . " (" . implode(', ', $fieldNames) . ") VALUES (" . implode(', ', array_keys($values)) . ")");
+        $stmt->execute($values);
+
+        return $this->pdo->lastInsertId();
+
+    }
+
+    /**
+     * Updates a subscription
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documenation for more info and examples.
+     *
+     * @param mixed $subscriptionId
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
+     */
+    function updateSubscription($subscriptionId, DAV\PropPatch $propPatch) {
+
+        $supportedProperties = array_keys($this->subscriptionPropertyMap);
+        $supportedProperties[] = '{http://calendarserver.org/ns/}source';
+
+        $propPatch->handle($supportedProperties, function($mutations) use ($subscriptionId) {
+
+            $newValues = [];
+
+            foreach ($mutations as $propertyName => $propertyValue) {
+
+                if ($propertyName === '{http://calendarserver.org/ns/}source') {
+                    $newValues['source'] = $propertyValue->getHref();
+                } else {
+                    $fieldName = $this->subscriptionPropertyMap[$propertyName];
+                    $newValues[$fieldName] = $propertyValue;
+                }
+
+            }
+
+            // Now we're generating the sql query.
+            $valuesSql = [];
+            foreach ($newValues as $fieldName => $value) {
+                $valuesSql[] = $fieldName . ' = ?';
+            }
+
+            $stmt = $this->pdo->prepare("UPDATE " . $this->calendarSubscriptionsTableName . " SET " . implode(', ', $valuesSql) . ", lastmodified = ? WHERE id = ?");
+            $newValues['lastmodified'] = time();
+            $newValues['id'] = $subscriptionId;
+            $stmt->execute(array_values($newValues));
+
+            return true;
+
+        });
+
+    }
+
+    /**
+     * Deletes a subscription
+     *
+     * @param mixed $subscriptionId
+     * @return void
+     */
+    function deleteSubscription($subscriptionId) {
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarSubscriptionsTableName . ' WHERE id = ?');
+        $stmt->execute([$subscriptionId]);
+
+    }
+
+    /**
+     * Returns a single scheduling object.
+     *
+     * The returned array should contain the following elements:
+     *   * uri - A unique basename for the object. This will be used to
+     *           construct a full uri.
+     *   * calendardata - The iCalendar object
+     *   * lastmodified - The last modification date. Can be an int for a unix
+     *                    timestamp, or a PHP DateTime object.
+     *   * etag - A unique token that must change if the object changed.
+     *   * size - The size of the object, in bytes.
+     *
+     * @param string $principalUri
+     * @param string $objectUri
+     * @return array
+     */
+    function getSchedulingObject($principalUri, $objectUri) {
+
+        $stmt = $this->pdo->prepare('SELECT uri, calendardata, lastmodified, etag, size FROM ' . $this->schedulingObjectTableName . ' WHERE principaluri = ? AND uri = ?');
+        $stmt->execute([$principalUri, $objectUri]);
+        $row = $stmt->fetch(\PDO::FETCH_ASSOC);
+
+        if (!$row) return null;
+
+        return [
+            'uri'          => $row['uri'],
+            'calendardata' => $row['calendardata'],
+            'lastmodified' => $row['lastmodified'],
+            'etag'         => '"' . $row['etag'] . '"',
+            'size'         => (int)$row['size'],
+         ];
+
+    }
+
+    /**
+     * Returns all scheduling objects for the inbox collection.
+     *
+     * These objects should be returned as an array. Every item in the array
+     * should follow the same structure as returned from getSchedulingObject.
+     *
+     * The main difference is that 'calendardata' is optional.
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    function getSchedulingObjects($principalUri) {
+
+        $stmt = $this->pdo->prepare('SELECT id, calendardata, uri, lastmodified, etag, size FROM ' . $this->schedulingObjectTableName . ' WHERE principaluri = ?');
+        $stmt->execute([$principalUri]);
+
+        $result = [];
+        foreach ($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
+            $result[] = [
+                'calendardata' => $row['calendardata'],
+                'uri'          => $row['uri'],
+                'lastmodified' => $row['lastmodified'],
+                'etag'         => '"' . $row['etag'] . '"',
+                'size'         => (int)$row['size'],
+            ];
+        }
+
+        return $result;
+
+    }
+
+    /**
+     * Deletes a scheduling object
+     *
+     * @param string $principalUri
+     * @param string $objectUri
+     * @return void
+     */
+    function deleteSchedulingObject($principalUri, $objectUri) {
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->schedulingObjectTableName . ' WHERE principaluri = ? AND uri = ?');
+        $stmt->execute([$principalUri, $objectUri]);
+
+    }
+
+    /**
+     * Creates a new scheduling object. This should land in a users' inbox.
+     *
+     * @param string $principalUri
+     * @param string $objectUri
+     * @param string $objectData
+     * @return void
+     */
+    function createSchedulingObject($principalUri, $objectUri, $objectData) {
+
+        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->schedulingObjectTableName . ' (principaluri, calendardata, uri, lastmodified, etag, size) VALUES (?, ?, ?, ?, ?, ?)');
+        $stmt->execute([$principalUri, $objectData, $objectUri, time(), md5($objectData), strlen($objectData) ]);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/SchedulingSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/SchedulingSupport.php
new file mode 100644
index 000000000..6ec0bf06b
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/SchedulingSupport.php
@@ -0,0 +1,65 @@
+<?php
+
+namespace Sabre\CalDAV\Backend;
+
+/**
+ * Implementing this interface adds CalDAV Scheduling support to your caldav
+ * server, as defined in rfc6638.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface SchedulingSupport extends BackendInterface {
+
+    /**
+     * Returns a single scheduling object for the inbox collection.
+     *
+     * The returned array should contain the following elements:
+     *   * uri - A unique basename for the object. This will be used to
+     *           construct a full uri.
+     *   * calendardata - The iCalendar object
+     *   * lastmodified - The last modification date. Can be an int for a unix
+     *                    timestamp, or a PHP DateTime object.
+     *   * etag - A unique token that must change if the object changed.
+     *   * size - The size of the object, in bytes.
+     *
+     * @param string $principalUri
+     * @param string $objectUri
+     * @return array
+     */
+    function getSchedulingObject($principalUri, $objectUri);
+
+    /**
+     * Returns all scheduling objects for the inbox collection.
+     *
+     * These objects should be returned as an array. Every item in the array
+     * should follow the same structure as returned from getSchedulingObject.
+     *
+     * The main difference is that 'calendardata' is optional.
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    function getSchedulingObjects($principalUri);
+
+    /**
+     * Deletes a scheduling object from the inbox collection.
+     *
+     * @param string $principalUri
+     * @param string $objectUri
+     * @return void
+     */
+    function deleteSchedulingObject($principalUri, $objectUri);
+
+    /**
+     * Creates a new scheduling object. This should land in a users' inbox.
+     *
+     * @param string $principalUri
+     * @param string $objectUri
+     * @param string $objectData
+     * @return void
+     */
+    function createSchedulingObject($principalUri, $objectUri, $objectData);
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/SharingSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/SharingSupport.php
index 4538fa5b5..6a11b0ab1 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/SharingSupport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/SharingSupport.php
@@ -70,7 +70,7 @@ namespace Sabre\CalDAV\Backend;
  * In the case of an invite, the sharee may reply with an 'accept' or
  * 'decline'. These are always represented by:
  *
- * Sabre\CalDAV\Notifications\Notification\Invite
+ * Sabre\CalDAV\Notifications\Notification\InviteReply
  *
  *
  * Calendar access by sharees
@@ -136,7 +136,7 @@ namespace Sabre\CalDAV\Backend;
  *   * unpublished
  *
  * If a calendar is published, the following property should be returned
- * for each calendar in getCalendarsForPrincipal.
+ * for each calendar in getCalendarsForUser.
  *
  * {http://calendarserver.org/ns/}publish-url
  *
@@ -157,7 +157,7 @@ namespace Sabre\CalDAV\Backend;
  * ==============================================
  *
  * If Sabre\CalDAV\Property\AllowedSharingModes is returned from
- * getCalendarsByUser, this allows the server to specify whether either sharing,
+ * getCalendarsForUser, this allows the server to specify whether either sharing,
  * or publishing is supported.
  *
  * This allows a client to determine in advance which features are available,
@@ -165,7 +165,7 @@ namespace Sabre\CalDAV\Backend;
  * the backend, the SharingPlugin automatically injects it and assumes both
  * features are available.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/SubscriptionSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/SubscriptionSupport.php
new file mode 100644
index 000000000..a39289f5e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/SubscriptionSupport.php
@@ -0,0 +1,89 @@
+<?php
+
+namespace Sabre\CalDAV\Backend;
+
+use Sabre\DAV;
+
+/**
+ * Every CalDAV backend must at least implement this interface.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface SubscriptionSupport extends BackendInterface {
+
+    /**
+     * Returns a list of subscriptions for a principal.
+     *
+     * Every subscription is an array with the following keys:
+     *  * id, a unique id that will be used by other functions to modify the
+     *    subscription. This can be the same as the uri or a database key.
+     *  * uri. This is just the 'base uri' or 'filename' of the subscription.
+     *  * principaluri. The owner of the subscription. Almost always the same as
+     *    principalUri passed to this method.
+     *
+     * Furthermore, all the subscription info must be returned too:
+     *
+     * 1. {DAV:}displayname
+     * 2. {http://apple.com/ns/ical/}refreshrate
+     * 3. {http://calendarserver.org/ns/}subscribed-strip-todos (omit if todos
+     *    should not be stripped).
+     * 4. {http://calendarserver.org/ns/}subscribed-strip-alarms (omit if alarms
+     *    should not be stripped).
+     * 5. {http://calendarserver.org/ns/}subscribed-strip-attachments (omit if
+     *    attachments should not be stripped).
+     * 6. {http://calendarserver.org/ns/}source (Must be a
+     *     Sabre\DAV\Property\Href).
+     * 7. {http://apple.com/ns/ical/}calendar-color
+     * 8. {http://apple.com/ns/ical/}calendar-order
+     * 9. {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set
+     *    (should just be an instance of
+     *    Sabre\CalDAV\Property\SupportedCalendarComponentSet, with a bunch of
+     *    default components).
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    function getSubscriptionsForUser($principalUri);
+
+    /**
+     * Creates a new subscription for a principal.
+     *
+     * If the creation was a success, an id must be returned that can be used to reference
+     * this subscription in other methods, such as updateSubscription.
+     *
+     * @param string $principalUri
+     * @param string $uri
+     * @param array $properties
+     * @return mixed
+     */
+    function createSubscription($principalUri, $uri, array $properties);
+
+    /**
+     * Updates a subscription
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documenation for more info and examples.
+     *
+     * @param mixed $subscriptionId
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
+     */
+    function updateSubscription($subscriptionId, DAV\PropPatch $propPatch);
+
+    /**
+     * Deletes a subscription.
+     *
+     * @param mixed $subscriptionId
+     * @return void
+     */
+    function deleteSubscription($subscriptionId);
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/SyncSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/SyncSupport.php
new file mode 100644
index 000000000..a934505f9
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/SyncSupport.php
@@ -0,0 +1,81 @@
+<?php
+
+namespace Sabre\CalDAV\Backend;
+
+/**
+ * WebDAV-sync support for CalDAV backends.
+ *
+ * In order for backends to advertise support for WebDAV-sync, this interface
+ * must be implemented.
+ *
+ * Implementing this can result in a significant reduction of bandwidth and CPU
+ * time.
+ *
+ * For this to work, you _must_ return a {http://sabredav.org/ns}sync-token
+ * property from getCalendarsFromUser.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface SyncSupport extends BackendInterface {
+
+    /**
+     * The getChanges method returns all the changes that have happened, since
+     * the specified syncToken in the specified calendar.
+     *
+     * This function should return an array, such as the following:
+     *
+     * [
+     *   'syncToken' => 'The current synctoken',
+     *   'added'   => [
+     *      'new.txt',
+     *   ],
+     *   'modified'   => [
+     *      'modified.txt',
+     *   ],
+     *   'deleted' => [
+     *      'foo.php.bak',
+     *      'old.txt'
+     *   ]
+     * );
+     *
+     * The returned syncToken property should reflect the *current* syncToken
+     * of the calendar, as reported in the {http://sabredav.org/ns}sync-token
+     * property This is * needed here too, to ensure the operation is atomic.
+     *
+     * If the $syncToken argument is specified as null, this is an initial
+     * sync, and all members should be reported.
+     *
+     * The modified property is an array of nodenames that have changed since
+     * the last token.
+     *
+     * The deleted property is an array with nodenames, that have been deleted
+     * from collection.
+     *
+     * The $syncLevel argument is basically the 'depth' of the report. If it's
+     * 1, you only have to report changes that happened only directly in
+     * immediate descendants. If it's 2, it should also include changes from
+     * the nodes below the child collections. (grandchildren)
+     *
+     * The $limit argument allows a client to specify how many results should
+     * be returned at most. If the limit is not specified, it should be treated
+     * as infinite.
+     *
+     * If the limit (infinite or not) is higher than you're willing to return,
+     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     *
+     * If the syncToken is expired (due to data cleanup) or unknown, you must
+     * return null.
+     *
+     * The limit is 'suggestive'. You are free to ignore it.
+     *
+     * @param string $calendarId
+     * @param string $syncToken
+     * @param int $syncLevel
+     * @param int $limit
+     * @return array
+     */
+    function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null);
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Calendar.php b/vendor/sabre/dav/lib/CalDAV/Calendar.php
new file mode 100644
index 000000000..ff8e19b15
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Calendar.php
@@ -0,0 +1,527 @@
+<?php
+
+namespace Sabre\CalDAV;
+
+use Sabre\DAV;
+use Sabre\DAVACL;
+use Sabre\DAV\PropPatch;
+
+/**
+ * This object represents a CalDAV calendar.
+ *
+ * A calendar can contain multiple TODO and or Events. These are represented
+ * as \Sabre\CalDAV\CalendarObject objects.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection, DAV\IMultiGet {
+
+    /**
+     * This is an array with calendar information
+     *
+     * @var array
+     */
+    protected $calendarInfo;
+
+    /**
+     * CalDAV backend
+     *
+     * @var Backend\BackendInterface
+     */
+    protected $caldavBackend;
+
+    /**
+     * Constructor
+     *
+     * @param Backend\BackendInterface $caldavBackend
+     * @param array $calendarInfo
+     */
+    function __construct(Backend\BackendInterface $caldavBackend, $calendarInfo) {
+
+        $this->caldavBackend = $caldavBackend;
+        $this->calendarInfo = $calendarInfo;
+
+    }
+
+    /**
+     * Returns the name of the calendar
+     *
+     * @return string
+     */
+    function getName() {
+
+        return $this->calendarInfo['uri'];
+
+    }
+
+    /**
+     * Updates properties on this node.
+     *
+     * This method received a PropPatch object, which contains all the
+     * information about the update.
+     *
+     * To update specific properties, call the 'handle' method on this object.
+     * Read the PropPatch documentation for more information.
+     *
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    function propPatch(PropPatch $propPatch) {
+
+        return $this->caldavBackend->updateCalendar($this->calendarInfo['id'], $propPatch);
+
+    }
+
+    /**
+     * Returns the list of properties
+     *
+     * @param array $requestedProperties
+     * @return array
+     */
+    function getProperties($requestedProperties) {
+
+        $response = [];
+
+        foreach ($this->calendarInfo as $propName => $propValue) {
+
+            if ($propName[0] === '{')
+                $response[$propName] = $this->calendarInfo[$propName];
+
+        }
+        return $response;
+
+    }
+
+    /**
+     * Returns a calendar object
+     *
+     * The contained calendar objects are for example Events or Todo's.
+     *
+     * @param string $name
+     * @return \Sabre\CalDAV\ICalendarObject
+     */
+    function getChild($name) {
+
+        $obj = $this->caldavBackend->getCalendarObject($this->calendarInfo['id'], $name);
+
+        if (!$obj) throw new DAV\Exception\NotFound('Calendar object not found');
+
+        $obj['acl'] = $this->getChildACL();
+
+        return new CalendarObject($this->caldavBackend, $this->calendarInfo, $obj);
+
+    }
+
+    /**
+     * Returns the full list of calendar objects
+     *
+     * @return array
+     */
+    function getChildren() {
+
+        $objs = $this->caldavBackend->getCalendarObjects($this->calendarInfo['id']);
+        $children = [];
+        foreach ($objs as $obj) {
+            $obj['acl'] = $this->getChildACL();
+            $children[] = new CalendarObject($this->caldavBackend, $this->calendarInfo, $obj);
+        }
+        return $children;
+
+    }
+
+    /**
+     * This method receives a list of paths in it's first argument.
+     * It must return an array with Node objects.
+     *
+     * If any children are not found, you do not have to return them.
+     *
+     * @param string[] $paths
+     * @return array
+     */
+    function getMultipleChildren(array $paths) {
+
+        $objs = $this->caldavBackend->getMultipleCalendarObjects($this->calendarInfo['id'], $paths);
+        $children = [];
+        foreach ($objs as $obj) {
+            $obj['acl'] = $this->getChildACL();
+            $children[] = new CalendarObject($this->caldavBackend, $this->calendarInfo, $obj);
+        }
+        return $children;
+
+    }
+
+    /**
+     * Checks if a child-node exists.
+     *
+     * @param string $name
+     * @return bool
+     */
+    function childExists($name) {
+
+        $obj = $this->caldavBackend->getCalendarObject($this->calendarInfo['id'], $name);
+        if (!$obj)
+            return false;
+        else
+            return true;
+
+    }
+
+    /**
+     * Creates a new directory
+     *
+     * We actually block this, as subdirectories are not allowed in calendars.
+     *
+     * @param string $name
+     * @return void
+     */
+    function createDirectory($name) {
+
+        throw new DAV\Exception\MethodNotAllowed('Creating collections in calendar objects is not allowed');
+
+    }
+
+    /**
+     * Creates a new file
+     *
+     * The contents of the new file must be a valid ICalendar string.
+     *
+     * @param string $name
+     * @param resource $calendarData
+     * @return string|null
+     */
+    function createFile($name, $calendarData = null) {
+
+        if (is_resource($calendarData)) {
+            $calendarData = stream_get_contents($calendarData);
+        }
+        return $this->caldavBackend->createCalendarObject($this->calendarInfo['id'], $name, $calendarData);
+
+    }
+
+    /**
+     * Deletes the calendar.
+     *
+     * @return void
+     */
+    function delete() {
+
+        $this->caldavBackend->deleteCalendar($this->calendarInfo['id']);
+
+    }
+
+    /**
+     * Renames the calendar. Note that most calendars use the
+     * {DAV:}displayname to display a name to display a name.
+     *
+     * @param string $newName
+     * @return void
+     */
+    function setName($newName) {
+
+        throw new DAV\Exception\MethodNotAllowed('Renaming calendars is not yet supported');
+
+    }
+
+    /**
+     * Returns the last modification date as a unix timestamp.
+     *
+     * @return void
+     */
+    function getLastModified() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getOwner() {
+
+        return $this->calendarInfo['principaluri'];
+
+    }
+
+    /**
+     * Returns a group principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getGroup() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    function getACL() {
+
+        $acl = [
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner() . '/calendar-proxy-read',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{' . Plugin::NS_CALDAV . '}read-free-busy',
+                'principal' => '{DAV:}authenticated',
+                'protected' => true,
+            ],
+
+        ];
+        if (empty($this->calendarInfo['{http://sabredav.org/ns}read-only'])) {
+            $acl[] = [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ];
+            $acl[] = [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ];
+        }
+
+        return $acl;
+
+    }
+
+    /**
+     * This method returns the ACL's for calendar objects in this calendar.
+     * The result of this method automatically gets passed to the
+     * calendar-object nodes in the calendar.
+     *
+     * @return array
+     */
+    function getChildACL() {
+
+        $acl = [
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner() . '/calendar-proxy-read',
+                'protected' => true,
+            ],
+
+        ];
+        if (empty($this->calendarInfo['{http://sabredav.org/ns}read-only'])) {
+            $acl[] = [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ];
+            $acl[] = [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ];
+
+        }
+        return $acl;
+
+    }
+
+    /**
+     * Updates the ACL
+     *
+     * This method will receive a list of new ACE's.
+     *
+     * @param array $acl
+     * @return void
+     */
+    function setACL(array $acl) {
+
+        throw new DAV\Exception\MethodNotAllowed('Changing ACL is not yet supported');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See \Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    function getSupportedPrivilegeSet() {
+
+        $default = DAVACL\Plugin::getDefaultSupportedPrivilegeSet();
+
+        // We need to inject 'read-free-busy' in the tree, aggregated under
+        // {DAV:}read.
+        foreach ($default['aggregates'] as &$agg) {
+
+            if ($agg['privilege'] !== '{DAV:}read') continue;
+
+            $agg['aggregates'][] = [
+                'privilege' => '{' . Plugin::NS_CALDAV . '}read-free-busy',
+            ];
+
+        }
+        return $default;
+
+    }
+
+    /**
+     * Performs a calendar-query on the contents of this calendar.
+     *
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by Sabre\CalDAV\CalendarQueryParser.
+     *
+     * @param array $filters
+     * @return array
+     */
+    function calendarQuery(array $filters) {
+
+        return $this->caldavBackend->calendarQuery($this->calendarInfo['id'], $filters);
+
+    }
+
+    /**
+     * This method returns the current sync-token for this collection.
+     * This can be any string.
+     *
+     * If null is returned from this function, the plugin assumes there's no
+     * sync information available.
+     *
+     * @return string|null
+     */
+    function getSyncToken() {
+
+        if (
+            $this->caldavBackend instanceof Backend\SyncSupport &&
+            isset($this->calendarInfo['{DAV:}sync-token'])
+        ) {
+            return $this->calendarInfo['{DAV:}sync-token'];
+        }
+        if (
+            $this->caldavBackend instanceof Backend\SyncSupport &&
+            isset($this->calendarInfo['{http://sabredav.org/ns}sync-token'])
+        ) {
+            return $this->calendarInfo['{http://sabredav.org/ns}sync-token'];
+        }
+
+    }
+
+    /**
+     * The getChanges method returns all the changes that have happened, since
+     * the specified syncToken and the current collection.
+     *
+     * This function should return an array, such as the following:
+     *
+     * [
+     *   'syncToken' => 'The current synctoken',
+     *   'added'   => [
+     *      'new.txt',
+     *   ],
+     *   'modified'   => [
+     *      'modified.txt',
+     *   ],
+     *   'deleted' => [
+     *      'foo.php.bak',
+     *      'old.txt'
+     *   ]
+     * ];
+     *
+     * The syncToken property should reflect the *current* syncToken of the
+     * collection, as reported getSyncToken(). This is needed here too, to
+     * ensure the operation is atomic.
+     *
+     * If the syncToken is specified as null, this is an initial sync, and all
+     * members should be reported.
+     *
+     * The modified property is an array of nodenames that have changed since
+     * the last token.
+     *
+     * The deleted property is an array with nodenames, that have been deleted
+     * from collection.
+     *
+     * The second argument is basically the 'depth' of the report. If it's 1,
+     * you only have to report changes that happened only directly in immediate
+     * descendants. If it's 2, it should also include changes from the nodes
+     * below the child collections. (grandchildren)
+     *
+     * The third (optional) argument allows a client to specify how many
+     * results should be returned at most. If the limit is not specified, it
+     * should be treated as infinite.
+     *
+     * If the limit (infinite or not) is higher than you're willing to return,
+     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     *
+     * If the syncToken is expired (due to data cleanup) or unknown, you must
+     * return null.
+     *
+     * The limit is 'suggestive'. You are free to ignore it.
+     *
+     * @param string $syncToken
+     * @param int $syncLevel
+     * @param int $limit
+     * @return array
+     */
+    function getChanges($syncToken, $syncLevel, $limit = null) {
+
+        if (!$this->caldavBackend instanceof Backend\SyncSupport) {
+            return null;
+        }
+
+        return $this->caldavBackend->getChangesForCalendar(
+            $this->calendarInfo['id'],
+            $syncToken,
+            $syncLevel,
+            $limit
+        );
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/UserCalendars.php b/vendor/sabre/dav/lib/CalDAV/CalendarHome.php
index 6e700eb04..a53f829e2 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/UserCalendars.php
+++ b/vendor/sabre/dav/lib/CalDAV/CalendarHome.php
@@ -3,16 +3,24 @@
 namespace Sabre\CalDAV;
 
 use Sabre\DAV;
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\MkCol;
 use Sabre\DAVACL;
+use Sabre\HTTP\URLUtil;
 
 /**
- * The UserCalenders class contains all calendars associated to one user
+ * The CalendarHome represents a node that is usually in a users'
+ * calendar-homeset.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * It contains all the users' calendars, and can optionally contain a
+ * notifications collection, calendar subscriptions, a users' inbox, and a
+ * users' outbox.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
+class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
 
     /**
      * CalDAV backend
@@ -34,7 +42,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      * @param Backend\BackendInterface $caldavBackend
      * @param mixed $userUri
      */
-    public function __construct(Backend\BackendInterface $caldavBackend, $principalInfo) {
+    function __construct(Backend\BackendInterface $caldavBackend, $principalInfo) {
 
         $this->caldavBackend = $caldavBackend;
         $this->principalInfo = $principalInfo;
@@ -46,9 +54,9 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
-        list(,$name) = DAV\URLUtil::splitPath($this->principalInfo['uri']);
+        list(, $name) = URLUtil::splitPath($this->principalInfo['uri']);
         return $name;
 
     }
@@ -59,7 +67,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      * @param string $name
      * @return void
      */
-    public function setName($name) {
+    function setName($name) {
 
         throw new DAV\Exception\Forbidden();
 
@@ -70,7 +78,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return void
      */
-    public function delete() {
+    function delete() {
 
         throw new DAV\Exception\Forbidden();
 
@@ -81,7 +89,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return int
      */
-    public function getLastModified() {
+    function getLastModified() {
 
         return null;
 
@@ -96,7 +104,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      * @param resource $data
      * @return void
      */
-    public function createFile($filename, $data=null) {
+    function createFile($filename, $data = null) {
 
         throw new DAV\Exception\MethodNotAllowed('Creating new files in this collection is not supported');
 
@@ -110,7 +118,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      * @param string $filename
      * @return void
      */
-    public function createDirectory($filename) {
+    function createDirectory($filename) {
 
         throw new DAV\Exception\MethodNotAllowed('Creating new collections in this collection is not supported');
 
@@ -120,17 +128,46 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      * Returns a single calendar, by name
      *
      * @param string $name
-     * @todo needs optimizing
      * @return Calendar
      */
-    public function getChild($name) {
+    function getChild($name) {
+
+        // Special nodes
+        if ($name === 'inbox' && $this->caldavBackend instanceof Backend\SchedulingSupport) {
+            return new Schedule\Inbox($this->caldavBackend, $this->principalInfo['uri']);
+        }
+        if ($name === 'outbox' && $this->caldavBackend instanceof Backend\SchedulingSupport) {
+            return new Schedule\Outbox($this->principalInfo['uri']);
+        }
+        if ($name === 'notifications' && $this->caldavBackend instanceof Backend\NotificationSupport) {
+            return new Notifications\Collection($this->caldavBackend, $this->principalInfo['uri']);
+        }
+
+        // Calendars
+        foreach ($this->caldavBackend->getCalendarsForUser($this->principalInfo['uri']) as $calendar) {
+            if ($calendar['uri'] === $name) {
+                if ($this->caldavBackend instanceof Backend\SharingSupport) {
+                    if (isset($calendar['{http://calendarserver.org/ns/}shared-url'])) {
+                        return new SharedCalendar($this->caldavBackend, $calendar);
+                    } else {
+                        return new ShareableCalendar($this->caldavBackend, $calendar);
+                    }
+                } else {
+                    return new Calendar($this->caldavBackend, $calendar);
+                }
+            }
+        }
 
-        foreach($this->getChildren() as $child) {
-            if ($name==$child->getName())
-                return $child;
+        if ($this->caldavBackend instanceof Backend\SubscriptionSupport) {
+            foreach ($this->caldavBackend->getSubscriptionsForUser($this->principalInfo['uri']) as $subscription) {
+                if ($subscription['uri'] === $name) {
+                    return new Subscriptions\Subscription($this->caldavBackend, $subscription);
+                }
+            }
 
         }
-        throw new DAV\Exception\NotFound('Calendar with name \'' . $name . '\' could not be found');
+
+        throw new NotFound('Node with name \'' . $name . '\' could not be found');
 
     }
 
@@ -138,17 +175,15 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      * Checks if a calendar exists.
      *
      * @param string $name
-     * @todo needs optimizing
      * @return bool
      */
-    public function childExists($name) {
-
-        foreach($this->getChildren() as $child) {
-            if ($name==$child->getName())
-                return true;
+    function childExists($name) {
 
+        try {
+            return !!$this->getChild($name);
+        } catch (NotFound $e) {
+            return false;
         }
-        return false;
 
     }
 
@@ -157,11 +192,11 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return array
      */
-    public function getChildren() {
+    function getChildren() {
 
         $calendars = $this->caldavBackend->getCalendarsForUser($this->principalInfo['uri']);
-        $objs = array();
-        foreach($calendars as $calendar) {
+        $objs = [];
+        foreach ($calendars as $calendar) {
             if ($this->caldavBackend instanceof Backend\SharingSupport) {
                 if (isset($calendar['{http://calendarserver.org/ns/}shared-url'])) {
                     $objs[] = new SharedCalendar($this->caldavBackend, $calendar);
@@ -172,28 +207,41 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
                 $objs[] = new Calendar($this->caldavBackend, $calendar);
             }
         }
-        $objs[] = new Schedule\Outbox($this->principalInfo['uri']);
+
+        if ($this->caldavBackend instanceof Backend\SchedulingSupport) {
+            $objs[] = new Schedule\Inbox($this->caldavBackend, $this->principalInfo['uri']);
+            $objs[] = new Schedule\Outbox($this->principalInfo['uri']);
+        }
 
         // We're adding a notifications node, if it's supported by the backend.
         if ($this->caldavBackend instanceof Backend\NotificationSupport) {
             $objs[] = new Notifications\Collection($this->caldavBackend, $this->principalInfo['uri']);
         }
+
+        // If the backend supports subscriptions, we'll add those as well,
+        if ($this->caldavBackend instanceof Backend\SubscriptionSupport) {
+            foreach ($this->caldavBackend->getSubscriptionsForUser($this->principalInfo['uri']) as $subscription) {
+                $objs[] = new Subscriptions\Subscription($this->caldavBackend, $subscription);
+            }
+        }
+
         return $objs;
 
     }
 
     /**
-     * Creates a new calendar
+     * Creates a new calendar or subscription.
      *
      * @param string $name
-     * @param array $resourceType
-     * @param array $properties
+     * @param MkCol $mkCol
+     * @throws DAV\Exception\InvalidResourceType
      * @return void
      */
-    public function createExtendedCollection($name, array $resourceType, array $properties) {
+    function createExtendedCollection($name, MkCol $mkCol) {
 
         $isCalendar = false;
-        foreach($resourceType as $rt) {
+        $isSubscription = false;
+        foreach ($mkCol->getResourceType() as $rt) {
             switch ($rt) {
                 case '{DAV:}collection' :
                 case '{http://calendarserver.org/ns/}shared-owner' :
@@ -202,14 +250,30 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
                 case '{urn:ietf:params:xml:ns:caldav}calendar' :
                     $isCalendar = true;
                     break;
+                case '{http://calendarserver.org/ns/}subscribed' :
+                    $isSubscription = true;
+                    break;
                 default :
                     throw new DAV\Exception\InvalidResourceType('Unknown resourceType: ' . $rt);
             }
         }
-        if (!$isCalendar) {
-            throw new DAV\Exception\InvalidResourceType('You can only create calendars in this collection');
+
+        $properties = $mkCol->getRemainingValues();
+        $mkCol->setRemainingResultCode(201);
+
+        if ($isSubscription) {
+            if (!$this->caldavBackend instanceof Backend\SubscriptionSupport) {
+                throw new DAV\Exception\InvalidResourceType('This backend does not support subscriptions');
+            }
+            $this->caldavBackend->createSubscription($this->principalInfo['uri'], $name, $properties);
+
+        } elseif ($isCalendar) {
+            $this->caldavBackend->createCalendar($this->principalInfo['uri'], $name, $properties);
+
+        } else {
+            throw new DAV\Exception\InvalidResourceType('You can only create calendars and subscriptions in this collection');
+
         }
-        $this->caldavBackend->createCalendar($this->principalInfo['uri'], $name, $properties);
 
     }
 
@@ -220,7 +284,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return string|null
      */
-    public function getOwner() {
+    function getOwner() {
 
         return $this->principalInfo['uri'];
 
@@ -233,7 +297,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return string|null
      */
-    public function getGroup() {
+    function getGroup() {
 
         return null;
 
@@ -251,36 +315,36 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
 
-        return array(
-            array(
+        return [
+            [
                 'privilege' => '{DAV:}read',
                 'principal' => $this->principalInfo['uri'],
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}write',
                 'principal' => $this->principalInfo['uri'],
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}read',
                 'principal' => $this->principalInfo['uri'] . '/calendar-proxy-write',
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}write',
                 'principal' => $this->principalInfo['uri'] . '/calendar-proxy-write',
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}read',
                 'principal' => $this->principalInfo['uri'] . '/calendar-proxy-read',
                 'protected' => true,
-            ),
+            ],
 
-        );
+        ];
 
     }
 
@@ -292,7 +356,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      * @param array $acl
      * @return void
      */
-    public function setACL(array $acl) {
+    function setACL(array $acl) {
 
         throw new DAV\Exception\MethodNotAllowed('Changing ACL is not yet supported');
 
@@ -310,7 +374,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return array|null
      */
-    public function getSupportedPrivilegeSet() {
+    function getSupportedPrivilegeSet() {
 
         return null;
 
@@ -329,7 +393,7 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
      * @param string $summary A description of the reply
      * @return null|string
      */
-    public function shareReply($href, $status, $calendarUri, $inReplyTo, $summary = null) {
+    function shareReply($href, $status, $calendarUri, $inReplyTo, $summary = null) {
 
         if (!$this->caldavBackend instanceof Backend\SharingSupport) {
             throw new DAV\Exception\NotImplemented('Sharing support is not implemented by this backend.');
@@ -339,4 +403,28 @@ class UserCalendars implements DAV\IExtendedCollection, DAVACL\IACL {
 
     }
 
+    /**
+     * Searches through all of a users calendars and calendar objects to find
+     * an object with a specific UID.
+     *
+     * This method should return the path to this object, relative to the
+     * calendar home, so this path usually only contains two parts:
+     *
+     * calendarpath/objectpath.ics
+     *
+     * If the uid is not found, return null.
+     *
+     * This method should only consider * objects that the principal owns, so
+     * any calendars owned by other principals that also appear in this
+     * collection should be ignored.
+     *
+     * @param string $uid
+     * @return string|null
+     */
+    function getCalendarObjectByUID($uid) {
+
+        return $this->caldavBackend->getCalendarObjectByUID($this->principalInfo['uri'], $uid);
+
+    }
+
 }
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/CalendarObject.php b/vendor/sabre/dav/lib/CalDAV/CalendarObject.php
index 2b9d2877e..393ca4cbd 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/CalendarObject.php
+++ b/vendor/sabre/dav/lib/CalDAV/CalendarObject.php
@@ -5,7 +5,7 @@ namespace Sabre\CalDAV;
 /**
  * The CalendarObject represents a single VEVENT or VTODO within a Calendar.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -35,17 +35,25 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
     /**
      * Constructor
      *
+     * The following properties may be passed within $objectData:
+     *
+     *   * calendarid - This must refer to a calendarid from a caldavBackend
+     *   * uri - A unique uri. Only the 'basename' must be passed.
+     *   * calendardata (optional) - The iCalendar data
+     *   * etag - (optional) The etag for this object, MUST be encloded with
+     *            double-quotes.
+     *   * size - (optional) The size of the data in bytes.
+     *   * lastmodified - (optional) format as a unix timestamp.
+     *   * acl - (optional) Use this to override the default ACL for the node.
+     *
      * @param Backend\BackendInterface $caldavBackend
      * @param array $calendarInfo
      * @param array $objectData
      */
-    public function __construct(Backend\BackendInterface $caldavBackend,array $calendarInfo,array $objectData) {
+    function __construct(Backend\BackendInterface $caldavBackend, array $calendarInfo, array $objectData) {
 
         $this->caldavBackend = $caldavBackend;
 
-        if (!isset($objectData['calendarid'])) {
-            throw new \InvalidArgumentException('The objectData argument must contain a \'calendarid\' property');
-        }
         if (!isset($objectData['uri'])) {
             throw new \InvalidArgumentException('The objectData argument must contain an \'uri\' property');
         }
@@ -60,7 +68,7 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return $this->objectData['uri'];
 
@@ -71,12 +79,12 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return string
      */
-    public function get() {
+    function get() {
 
         // Pre-populating the 'calendardata' is optional, if we don't have it
         // already we fetch it from the backend.
         if (!isset($this->objectData['calendardata'])) {
-            $this->objectData = $this->caldavBackend->getCalendarObject($this->objectData['calendarid'], $this->objectData['uri']);
+            $this->objectData = $this->caldavBackend->getCalendarObject($this->calendarInfo['id'], $this->objectData['uri']);
         }
         return $this->objectData['calendardata'];
 
@@ -88,12 +96,12 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      * @param string|resource $calendarData
      * @return string
      */
-    public function put($calendarData) {
+    function put($calendarData) {
 
         if (is_resource($calendarData)) {
             $calendarData = stream_get_contents($calendarData);
         }
-        $etag = $this->caldavBackend->updateCalendarObject($this->calendarInfo['id'],$this->objectData['uri'],$calendarData);
+        $etag = $this->caldavBackend->updateCalendarObject($this->calendarInfo['id'], $this->objectData['uri'], $calendarData);
         $this->objectData['calendardata'] = $calendarData;
         $this->objectData['etag'] = $etag;
 
@@ -106,9 +114,9 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return void
      */
-    public function delete() {
+    function delete() {
 
-        $this->caldavBackend->deleteCalendarObject($this->calendarInfo['id'],$this->objectData['uri']);
+        $this->caldavBackend->deleteCalendarObject($this->calendarInfo['id'], $this->objectData['uri']);
 
     }
 
@@ -117,9 +125,13 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return string
      */
-    public function getContentType() {
+    function getContentType() {
 
-        return 'text/calendar; charset=utf-8';
+        $mime = 'text/calendar; charset=utf-8';
+        if (isset($this->objectData['component']) && $this->objectData['component']) {
+            $mime .= '; component=' . $this->objectData['component'];
+        }
+        return $mime;
 
     }
 
@@ -130,12 +142,12 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return string
      */
-    public function getETag() {
+    function getETag() {
 
         if (isset($this->objectData['etag'])) {
             return $this->objectData['etag'];
         } else {
-            return '"' . md5($this->get()). '"';
+            return '"' . md5($this->get()) . '"';
         }
 
     }
@@ -145,7 +157,7 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return int
      */
-    public function getLastModified() {
+    function getLastModified() {
 
         return $this->objectData['lastmodified'];
 
@@ -156,9 +168,9 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return int
      */
-    public function getSize() {
+    function getSize() {
 
-        if (array_key_exists('size',$this->objectData)) {
+        if (array_key_exists('size', $this->objectData)) {
             return $this->objectData['size'];
         } else {
             return strlen($this->get());
@@ -173,7 +185,7 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return string|null
      */
-    public function getOwner() {
+    function getOwner() {
 
         return $this->calendarInfo['principaluri'];
 
@@ -186,7 +198,7 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return string|null
      */
-    public function getGroup() {
+    function getGroup() {
 
         return null;
 
@@ -204,7 +216,7 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
 
         // An alternative acl may be specified in the object data.
         if (isset($this->objectData['acl'])) {
@@ -212,34 +224,34 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
         }
 
         // The default ACL
-        return array(
-            array(
+        return [
+            [
                 'privilege' => '{DAV:}read',
                 'principal' => $this->calendarInfo['principaluri'],
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}write',
                 'principal' => $this->calendarInfo['principaluri'],
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}read',
                 'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}write',
                 'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}read',
                 'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-read',
                 'protected' => true,
-            ),
+            ],
 
-        );
+        ];
 
     }
 
@@ -251,7 +263,7 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      * @param array $acl
      * @return void
      */
-    public function setACL(array $acl) {
+    function setACL(array $acl) {
 
         throw new \Sabre\DAV\Exception\MethodNotAllowed('Changing ACL is not yet supported');
 
@@ -269,11 +281,10 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return array|null
      */
-    public function getSupportedPrivilegeSet() {
+    function getSupportedPrivilegeSet() {
 
         return null;
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/CalendarQueryValidator.php b/vendor/sabre/dav/lib/CalDAV/CalendarQueryValidator.php
index 494aed1a7..f3c7524d2 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/CalendarQueryValidator.php
+++ b/vendor/sabre/dav/lib/CalDAV/CalendarQueryValidator.php
@@ -14,7 +14,7 @@ use DateTime;
  * This is used to determine which icalendar objects should be returned for a
  * calendar-query REPORT request.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -29,7 +29,7 @@ class CalendarQueryValidator {
      * @param array $filters
      * @return bool
      */
-    public function validate(VObject\Component $vObject,array $filters) {
+    function validate(VObject\Component\VCalendar $vObject, array $filters) {
 
         // The top level object is always a component filter.
         // We'll parse it manually, as it's pretty simple.
@@ -57,9 +57,9 @@ class CalendarQueryValidator {
      */
     protected function validateCompFilters(VObject\Component $parent, array $filters) {
 
-        foreach($filters as $filter) {
+        foreach ($filters as $filter) {
 
-            $isDefined = isset($parent->$filter['name']);
+            $isDefined = isset($parent->{$filter['name']});
 
             if ($filter['is-not-defined']) {
 
@@ -75,7 +75,7 @@ class CalendarQueryValidator {
             }
 
             if ($filter['time-range']) {
-                foreach($parent->$filter['name'] as $subComponent) {
+                foreach ($parent->{$filter['name']} as $subComponent) {
                     if ($this->validateTimeRange($subComponent, $filter['time-range']['start'], $filter['time-range']['end'])) {
                         continue 2;
                     }
@@ -89,7 +89,7 @@ class CalendarQueryValidator {
 
             // If there are sub-filters, we need to find at least one component
             // for which the subfilters hold true.
-            foreach($parent->$filter['name'] as $subComponent) {
+            foreach ($parent->{$filter['name']} as $subComponent) {
 
                 if (
                     $this->validateCompFilters($subComponent, $filter['comp-filters']) &&
@@ -126,9 +126,9 @@ class CalendarQueryValidator {
      */
     protected function validatePropFilters(VObject\Component $parent, array $filters) {
 
-        foreach($filters as $filter) {
+        foreach ($filters as $filter) {
 
-            $isDefined = isset($parent->$filter['name']);
+            $isDefined = isset($parent->{$filter['name']});
 
             if ($filter['is-not-defined']) {
 
@@ -144,7 +144,7 @@ class CalendarQueryValidator {
             }
 
             if ($filter['time-range']) {
-                foreach($parent->$filter['name'] as $subComponent) {
+                foreach ($parent->{$filter['name']} as $subComponent) {
                     if ($this->validateTimeRange($subComponent, $filter['time-range']['start'], $filter['time-range']['end'])) {
                         continue 2;
                     }
@@ -158,9 +158,9 @@ class CalendarQueryValidator {
 
             // If there are sub-filters, we need to find at least one property
             // for which the subfilters hold true.
-            foreach($parent->$filter['name'] as $subComponent) {
+            foreach ($parent->{$filter['name']} as $subComponent) {
 
-                if(
+                if (
                     $this->validateParamFilters($subComponent, $filter['param-filters']) &&
                     (!$filter['text-match'] || $this->validateTextMatch($subComponent, $filter['text-match']))
                 ) {
@@ -196,7 +196,7 @@ class CalendarQueryValidator {
      */
     protected function validateParamFilters(VObject\Property $parent, array $filters) {
 
-        foreach($filters as $filter) {
+        foreach ($filters as $filter) {
 
             $isDefined = isset($parent[$filter['name']]);
 
@@ -217,30 +217,13 @@ class CalendarQueryValidator {
                 continue;
             }
 
-            if (version_compare(VObject\Version::VERSION, '3.0.0beta1', '>=')) {
-
-                // If there are sub-filters, we need to find at least one parameter
-                // for which the subfilters hold true.
-                foreach($parent[$filter['name']]->getParts() as $subParam) {
-
-                    if($this->validateTextMatch($subParam,$filter['text-match'])) {
-                        // We had a match, so this param-filter succeeds
-                        continue 2;
-                    }
-
-                }
-
-            } else {
-
-                // If there are sub-filters, we need to find at least one parameter
-                // for which the subfilters hold true.
-                foreach($parent[$filter['name']] as $subParam) {
-
-                    if($this->validateTextMatch($subParam,$filter['text-match'])) {
-                        // We had a match, so this param-filter succeeds
-                        continue 2;
-                    }
+            // If there are sub-filters, we need to find at least one parameter
+            // for which the subfilters hold true.
+            foreach ($parent[$filter['name']]->getParts() as $paramPart) {
 
+                if ($this->validateTextMatch($paramPart, $filter['text-match'])) {
+                    // We had a match, so this param-filter succeeds
+                    continue 2;
                 }
 
             }
@@ -270,7 +253,7 @@ class CalendarQueryValidator {
     protected function validateTextMatch($check, array $textMatch) {
 
         if ($check instanceof VObject\Node) {
-            $check = (string)$check;
+            $check = $check->getValue();
         }
 
         $isMatching = \Sabre\DAV\StringUtil::textMatch($check, $textMatch['value'], $textMatch['collation']);
@@ -299,7 +282,7 @@ class CalendarQueryValidator {
             $end = new DateTime('3000-01-01');
         }
 
-        switch($component->name) {
+        switch ($component->name) {
 
             case 'VEVENT' :
             case 'VTODO' :
@@ -318,8 +301,8 @@ class CalendarQueryValidator {
                 if ($component->parent->name === 'VEVENT' && $component->parent->RRULE) {
 
                     // Fire up the iterator!
-                    $it = new VObject\RecurrenceIterator($component->parent->parent, (string)$component->parent->UID);
-                    while($it->valid()) {
+                    $it = new VObject\Recur\EventIterator($component->parent->parent, (string)$component->parent->UID);
+                    while ($it->valid()) {
                         $expandedEvent = $it->getEventObject();
 
                         // We need to check from these expanded alarms, which
@@ -327,7 +310,7 @@ class CalendarQueryValidator {
                         // determine if we can 'give up' expanding events.
                         $firstAlarm = null;
                         if ($expandedEvent->VALARM !== null) {
-                            foreach($expandedEvent->VALARM as $expandedAlarm) {
+                            foreach ($expandedEvent->VALARM as $expandedAlarm) {
 
                                 $effectiveTrigger = $expandedAlarm->getEffectiveTriggerTime();
                                 if ($expandedAlarm->isInTimeRange($start, $end)) {
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/CalendarRootNode.php b/vendor/sabre/dav/lib/CalDAV/CalendarRoot.php
index 4f72ad444..0ac50e41d 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/CalendarRootNode.php
+++ b/vendor/sabre/dav/lib/CalDAV/CalendarRoot.php
@@ -10,11 +10,14 @@ use Sabre\DAVACL\PrincipalBackend;
  * This object is responsible for generating a list of calendar-homes for each
  * user.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * This is the top-most node for the calendars tree. In most servers this class
+ * represents the "/calendars" path.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CalendarRootNode extends \Sabre\DAVACL\AbstractPrincipalCollection {
+class CalendarRoot extends \Sabre\DAVACL\AbstractPrincipalCollection {
 
     /**
      * CalDAV backend
@@ -37,7 +40,7 @@ class CalendarRootNode extends \Sabre\DAVACL\AbstractPrincipalCollection {
      * @param Backend\BackendInterface $caldavBackend
      * @param string $principalPrefix
      */
-    public function __construct(PrincipalBackend\BackendInterface $principalBackend,Backend\BackendInterface $caldavBackend, $principalPrefix = 'principals') {
+    function __construct(PrincipalBackend\BackendInterface $principalBackend, Backend\BackendInterface $caldavBackend, $principalPrefix = 'principals') {
 
         parent::__construct($principalBackend, $principalPrefix);
         $this->caldavBackend = $caldavBackend;
@@ -52,7 +55,7 @@ class CalendarRootNode extends \Sabre\DAVACL\AbstractPrincipalCollection {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return Plugin::CALENDAR_ROOT;
 
@@ -68,9 +71,9 @@ class CalendarRootNode extends \Sabre\DAVACL\AbstractPrincipalCollection {
      * @param array $principal
      * @return \Sabre\DAV\INode
      */
-    public function getChildForPrincipal(array $principal) {
+    function getChildForPrincipal(array $principal) {
 
-        return new UserCalendars($this->caldavBackend, $principal);
+        return new CalendarHome($this->caldavBackend, $principal);
 
     }
 
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Exception/InvalidComponentType.php b/vendor/sabre/dav/lib/CalDAV/Exception/InvalidComponentType.php
index f2a64e33f..5ce8a93f5 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Exception/InvalidComponentType.php
+++ b/vendor/sabre/dav/lib/CalDAV/Exception/InvalidComponentType.php
@@ -8,7 +8,7 @@ use Sabre\CalDAV;
 /**
  * InvalidComponentType
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -23,11 +23,11 @@ class InvalidComponentType extends DAV\Exception\Forbidden {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server, \DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
         $doc = $errorNode->ownerDocument;
 
-        $np = $doc->createElementNS(CalDAV\Plugin::NS_CALDAV,'cal:supported-calendar-component');
+        $np = $doc->createElementNS(CalDAV\Plugin::NS_CALDAV, 'cal:supported-calendar-component');
         $errorNode->appendChild($np);
 
     }
diff --git a/vendor/sabre/dav/lib/CalDAV/ICSExportPlugin.php b/vendor/sabre/dav/lib/CalDAV/ICSExportPlugin.php
new file mode 100644
index 000000000..8c296d50f
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/ICSExportPlugin.php
@@ -0,0 +1,366 @@
+<?php
+
+namespace Sabre\CalDAV;
+
+use DateTimeZone;
+use Sabre\DAV;
+use Sabre\VObject;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Sabre\DAV\Exception\BadRequest;
+use DateTime;
+
+/**
+ * ICS Exporter
+ *
+ * This plugin adds the ability to export entire calendars as .ics files.
+ * This is useful for clients that don't support CalDAV yet. They often do
+ * support ics files.
+ *
+ * To use this, point a http client to a caldav calendar, and add ?expand to
+ * the url.
+ *
+ * Further options that can be added to the url:
+ *   start=123456789 - Only return events after the given unix timestamp
+ *   end=123245679   - Only return events from before the given unix timestamp
+ *   expand=1        - Strip timezone information and expand recurring events.
+ *                     If you'd like to expand, you _must_ also specify start
+ *                     and end.
+ *
+ * By default this plugin returns data in the text/calendar format (iCalendar
+ * 2.0). If you'd like to receive jCal data instead, you can use an Accept
+ * header:
+ *
+ * Accept: application/calendar+json
+ *
+ * Alternatively, you can also specify this in the url using
+ * accept=application/calendar+json, or accept=jcal for short. If the url
+ * parameter and Accept header is specified, the url parameter wins.
+ *
+ * Note that specifying a start or end data implies that only events will be
+ * returned. VTODO and VJOURNAL will be stripped.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class ICSExportPlugin extends DAV\ServerPlugin {
+
+    /**
+     * Reference to Server class
+     *
+     * @var \Sabre\DAV\Server
+     */
+    protected $server;
+
+    /**
+     * Initializes the plugin and registers event handlers
+     *
+     * @param \Sabre\DAV\Server $server
+     * @return void
+     */
+    function initialize(DAV\Server $server) {
+
+        $this->server = $server;
+        $server->on('method:GET', [$this, 'httpGet'], 90);
+        $server->on('browserButtonActions', function($path, $node, &$actions) {
+            if ($node instanceof ICalendar) {
+                $actions .= '<a href="' . htmlspecialchars($path, ENT_QUOTES, 'UTF-8') . '?export"><span class="oi" data-glyph="calendar"></span></a>';
+            }
+        });
+
+    }
+
+    /**
+     * Intercepts GET requests on calendar urls ending with ?export.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpGet(RequestInterface $request, ResponseInterface $response) {
+
+        $queryParams = $request->getQueryParameters();
+        if (!array_key_exists('export', $queryParams)) return;
+
+        $path = $request->getPath();
+
+        $node = $this->server->getProperties($path, [
+            '{DAV:}resourcetype',
+            '{DAV:}displayname',
+            '{http://sabredav.org/ns}sync-token',
+            '{DAV:}sync-token',
+            '{http://apple.com/ns/ical/}calendar-color',
+        ]);
+
+        if (!isset($node['{DAV:}resourcetype']) || !$node['{DAV:}resourcetype']->is('{' . Plugin::NS_CALDAV . '}calendar')) {
+            return;
+        }
+        // Marking the transactionType, for logging purposes.
+        $this->server->transactionType = 'get-calendar-export';
+
+        $properties = $node;
+
+        $start = null;
+        $end = null;
+        $expand = false;
+        $componentType = false;
+        if (isset($queryParams['start'])) {
+            if (!ctype_digit($queryParams['start'])) {
+                throw new BadRequest('The start= parameter must contain a unix timestamp');
+            }
+            $start = DateTime::createFromFormat('U', $queryParams['start']);
+        }
+        if (isset($queryParams['end'])) {
+            if (!ctype_digit($queryParams['end'])) {
+                throw new BadRequest('The end= parameter must contain a unix timestamp');
+            }
+            $end = DateTime::createFromFormat('U', $queryParams['end']);
+        }
+        if (isset($queryParams['expand']) && !!$queryParams['expand']) {
+            if (!$start || !$end) {
+                throw new BadRequest('If you\'d like to expand recurrences, you must specify both a start= and end= parameter.');
+            }
+            $expand = true;
+            $componentType = 'VEVENT';
+        }
+        if (isset($queryParams['componentType'])) {
+            if (!in_array($queryParams['componentType'], ['VEVENT', 'VTODO', 'VJOURNAL'])) {
+                throw new BadRequest('You are not allowed to search for components of type: ' . $queryParams['componentType'] . ' here');
+            }
+            $componentType = $queryParams['componentType'];
+        }
+
+        $format = \Sabre\HTTP\Util::Negotiate(
+            $request->getHeader('Accept'),
+            [
+                'text/calendar',
+                'application/calendar+json',
+            ]
+        );
+
+        if (isset($queryParams['accept'])) {
+            if ($queryParams['accept'] === 'application/calendar+json' || $queryParams['accept'] === 'jcal') {
+                $format = 'application/calendar+json';
+            }
+        }
+        if (!$format) {
+            $format = 'text/calendar';
+        }
+
+        $this->generateResponse($path, $start, $end, $expand, $componentType, $format, $properties, $response);
+
+        // Returning false to break the event chain
+        return false;
+
+    }
+
+    /**
+     * This method is responsible for generating the actual, full response.
+     *
+     * @param string $path
+     * @param DateTime|null $start
+     * @param DateTime|null $end
+     * @param bool $expand
+     * @param string $componentType
+     * @param string $format
+     * @param array $properties
+     * @param ResponseInterface $response
+     */
+    protected function generateResponse($path, $start, $end, $expand, $componentType, $format, $properties, ResponseInterface $response) {
+
+        $calDataProp = '{' . Plugin::NS_CALDAV . '}calendar-data';
+
+        $blobs = [];
+        if ($start || $end || $componentType) {
+
+            // If there was a start or end filter, we need to enlist
+            // calendarQuery for speed.
+            $calendarNode = $this->server->tree->getNodeForPath($path);
+            $queryResult = $calendarNode->calendarQuery([
+                'name'         => 'VCALENDAR',
+                'comp-filters' => [
+                    [
+                        'name'           => $componentType,
+                        'comp-filters'   => [],
+                        'prop-filters'   => [],
+                        'is-not-defined' => false,
+                        'time-range'     => [
+                            'start' => $start,
+                            'end'   => $end,
+                        ],
+                    ],
+                ],
+                'prop-filters'   => [],
+                'is-not-defined' => false,
+                'time-range'     => null,
+            ]);
+
+            // queryResult is just a list of base urls. We need to prefix the
+            // calendar path.
+            $queryResult = array_map(
+                function($item) use ($path) {
+                    return $path . '/' . $item;
+                },
+                $queryResult
+            );
+            $nodes = $this->server->getPropertiesForMultiplePaths($queryResult, [$calDataProp]);
+            unset($queryResult);
+
+        } else {
+            $nodes = $this->server->getPropertiesForPath($path, [$calDataProp], 1);
+        }
+
+        // Flattening the arrays
+        foreach ($nodes as $node) {
+            if (isset($node[200][$calDataProp])) {
+                $blobs[$node['href']] = $node[200][$calDataProp];
+            }
+        }
+        unset($nodes);
+
+        $mergedCalendar = $this->mergeObjects(
+            $properties,
+            $blobs
+        );
+
+        if ($expand) {
+            $calendarTimeZone = null;
+            // We're expanding, and for that we need to figure out the
+            // calendar's timezone.
+            $tzProp = '{' . Plugin::NS_CALDAV . '}calendar-timezone';
+            $tzResult = $this->server->getProperties($path, [$tzProp]);
+            if (isset($tzResult[$tzProp])) {
+                // This property contains a VCALENDAR with a single
+                // VTIMEZONE.
+                $vtimezoneObj = VObject\Reader::read($tzResult[$tzProp]);
+                $calendarTimeZone = $vtimezoneObj->VTIMEZONE->getTimeZone();
+                // Destroy circular references to PHP will GC the object.
+                $vtimezoneObj->destroy();
+                unset($vtimezoneObj);
+            } else {
+                // Defaulting to UTC.
+                $calendarTimeZone = new DateTimeZone('UTC');
+            }
+
+            $mergedCalendar = $mergedCalendar->expand($start, $end, $calendarTimeZone);
+        }
+
+        $response->setHeader('Content-Type', $format);
+
+        switch ($format) {
+            case 'text/calendar' :
+                $mergedCalendar = $mergedCalendar->serialize();
+                break;
+            case 'application/calendar+json' :
+                $mergedCalendar = json_encode($mergedCalendar->jsonSerialize());
+                break;
+        }
+
+        $response->setStatus(200);
+        $response->setBody($mergedCalendar);
+
+    }
+
+    /**
+     * Merges all calendar objects, and builds one big iCalendar blob.
+     *
+     * @param array $properties Some CalDAV properties
+     * @param array $inputObjects
+     * @return VObject\Component\VCalendar
+     */
+    function mergeObjects(array $properties, array $inputObjects) {
+
+        $calendar = new VObject\Component\VCalendar();
+        $calendar->version = '2.0';
+        if (DAV\Server::$exposeVersion) {
+            $calendar->prodid = '-//SabreDAV//SabreDAV ' . DAV\Version::VERSION . '//EN';
+        } else {
+            $calendar->prodid = '-//SabreDAV//SabreDAV//EN';
+        }
+        if (isset($properties['{DAV:}displayname'])) {
+            $calendar->{'X-WR-CALNAME'} = $properties['{DAV:}displayname'];
+        }
+        if (isset($properties['{http://apple.com/ns/ical/}calendar-color'])) {
+            $calendar->{'X-APPLE-CALENDAR-COLOR'} = $properties['{http://apple.com/ns/ical/}calendar-color'];
+        }
+
+        $collectedTimezones = [];
+
+        $timezones = [];
+        $objects = [];
+
+        foreach ($inputObjects as $href => $inputObject) {
+
+            $nodeComp = VObject\Reader::read($inputObject);
+
+            foreach ($nodeComp->children() as $child) {
+
+                switch ($child->name) {
+                    case 'VEVENT' :
+                    case 'VTODO' :
+                    case 'VJOURNAL' :
+                        $objects[] = clone $child;
+                        break;
+
+                    // VTIMEZONE is special, because we need to filter out the duplicates
+                    case 'VTIMEZONE' :
+                        // Naively just checking tzid.
+                        if (in_array((string)$child->TZID, $collectedTimezones)) continue;
+
+                        $timezones[] = clone $child;
+                        $collectedTimezones[] = $child->TZID;
+                        break;
+
+                }
+
+            }
+            // Destroy circular references to PHP will GC the object.
+            $nodeComp->destroy();
+            unset($nodeComp);
+
+        }
+
+        foreach ($timezones as $tz) $calendar->add($tz);
+        foreach ($objects as $obj) $calendar->add($obj);
+
+        return $calendar;
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using \Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'ics-export';
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Adds the ability to export CalDAV calendars as a single iCalendar file.',
+            'link'        => 'http://sabre.io/dav/ics-export-plugin/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/ICalendar.php b/vendor/sabre/dav/lib/CalDAV/ICalendar.php
new file mode 100644
index 000000000..7cf4b1256
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/ICalendar.php
@@ -0,0 +1,18 @@
+<?php
+
+namespace Sabre\CalDAV;
+
+use Sabre\DAVACL;
+
+/**
+ * Calendar interface
+ *
+ * Implement this interface to allow a node to be recognized as an calendar.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface ICalendar extends ICalendarObjectContainer, DAVACL\IACL {
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/ICalendarObject.php b/vendor/sabre/dav/lib/CalDAV/ICalendarObject.php
index 0776abff0..b3a767b74 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/ICalendarObject.php
+++ b/vendor/sabre/dav/lib/CalDAV/ICalendarObject.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Sabre\CalDAV;
+
 use Sabre\DAV;
 
 /**
@@ -11,11 +12,10 @@ use Sabre\DAV;
  *
  * Calendar objects are resources such as Events, Todo's or Journals.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 interface ICalendarObject extends DAV\IFile {
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/ICalendar.php b/vendor/sabre/dav/lib/CalDAV/ICalendarObjectContainer.php
index 0f0547046..0308b8a55 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/ICalendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/ICalendarObjectContainer.php
@@ -1,18 +1,21 @@
 <?php
 
 namespace Sabre\CalDAV;
-use Sabre\DAV;
 
 /**
- * Calendar interface
+ * This interface represents a node that may contain calendar objects.
  *
- * Implement this interface to allow a node to be recognized as an calendar.
+ * This is the shared parent for both the Inbox collection and calendars
+ * resources.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * In most cases you will likely want to look at ICalendar instead of this
+ * interface.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ICalendar extends DAV\ICollection {
+interface ICalendarObjectContainer extends \Sabre\DAV\ICollection {
 
     /**
      * Performs a calendar-query on the contents of this calendar.
@@ -31,6 +34,6 @@ interface ICalendar extends DAV\ICollection {
      * @param array $filters
      * @return array
      */
-    public function calendarQuery(array $filters);
+    function calendarQuery(array $filters);
 
 }
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/IShareableCalendar.php b/vendor/sabre/dav/lib/CalDAV/IShareableCalendar.php
index 4dd62e5c6..cfda91a55 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/IShareableCalendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/IShareableCalendar.php
@@ -5,7 +5,7 @@ namespace Sabre\CalDAV;
 /**
  * This interface represents a Calendar that can be shared with other users.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/ISharedCalendar.php b/vendor/sabre/dav/lib/CalDAV/ISharedCalendar.php
index 917d1c498..84442ac21 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/ISharedCalendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/ISharedCalendar.php
@@ -5,7 +5,7 @@ namespace Sabre\CalDAV;
 /**
  * This interface represents a Calendar that is shared by a different user.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Collection.php b/vendor/sabre/dav/lib/CalDAV/Notifications/Collection.php
index 028b00d87..1fcc1171c 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Collection.php
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/Collection.php
@@ -16,7 +16,7 @@ use Sabre\DAVACL;
  * This collection should only return Sabre\CalDAV\Notifications\INode nodes as
  * its children.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -42,7 +42,7 @@ class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
      * @param CalDAV\Backend\NotificationSupport $caldavBackend
      * @param string $principalUri
      */
-    public function __construct(CalDAV\Backend\NotificationSupport $caldavBackend, $principalUri) {
+    function __construct(CalDAV\Backend\NotificationSupport $caldavBackend, $principalUri) {
 
         $this->caldavBackend = $caldavBackend;
         $this->principalUri = $principalUri;
@@ -54,12 +54,12 @@ class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
      *
      * @return array
      */
-    public function getChildren() {
+    function getChildren() {
 
-        $children = array();
+        $children = [];
         $notifications = $this->caldavBackend->getNotificationsForPrincipal($this->principalUri);
 
-        foreach($notifications as $notification) {
+        foreach ($notifications as $notification) {
 
             $children[] = new Node(
                 $this->caldavBackend,
@@ -77,7 +77,7 @@ class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return 'notifications';
 
@@ -90,7 +90,7 @@ class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
      *
      * @return string|null
      */
-    public function getOwner() {
+    function getOwner() {
 
         return $this->principalUri;
 
@@ -103,7 +103,7 @@ class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
      *
      * @return string|null
      */
-    public function getGroup() {
+    function getGroup() {
 
         return null;
 
@@ -121,20 +121,20 @@ class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
 
-        return array(
-            array(
+        return [
+            [
                 'principal' => $this->getOwner(),
                 'privilege' => '{DAV:}read',
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'principal' => $this->getOwner(),
                 'privilege' => '{DAV:}write',
                 'protected' => true,
-            )
-        );
+            ]
+        ];
 
     }
 
@@ -146,7 +146,7 @@ class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
      * @param array $acl
      * @return void
      */
-    public function setACL(array $acl) {
+    function setACL(array $acl) {
 
         throw new DAV\Exception\NotImplemented('Updating ACLs is not implemented here');
 
@@ -164,7 +164,7 @@ class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
      *
      * @return array|null
      */
-    public function getSupportedPrivilegeSet() {
+    function getSupportedPrivilegeSet() {
 
         return null;
 
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/ICollection.php b/vendor/sabre/dav/lib/CalDAV/Notifications/ICollection.php
index 26e13b211..008e87435 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/ICollection.php
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/ICollection.php
@@ -14,11 +14,10 @@ use Sabre\DAV;
  * This collection should only return Sabre\CalDAV\Notifications\INode nodes as
  * its children.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 interface ICollection extends DAV\ICollection {
 
-
 }
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/INode.php b/vendor/sabre/dav/lib/CalDAV/Notifications/INode.php
index cd7fc5798..f9986b714 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/INode.php
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/INode.php
@@ -12,7 +12,7 @@ namespace Sabre\CalDAV\Notifications;
  * For a complete example, check out the Notification class, which contains
  * some helper functions.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Node.php b/vendor/sabre/dav/lib/CalDAV/Notifications/Node.php
index 6367e9388..47e78d5de 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Node.php
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/Node.php
@@ -4,6 +4,7 @@ namespace Sabre\CalDAV\Notifications;
 
 use Sabre\DAV;
 use Sabre\CalDAV;
+use Sabre\CalDAV\Xml\Notification\NotificationInterface;
 use Sabre\DAVACL;
 
 /**
@@ -12,8 +13,8 @@ use Sabre\DAVACL;
  * The signature is mostly identical to that of Sabre\DAV\IFile, but the get() method
  * MUST return an xml document that matches the requirements of the
  * 'caldav-notifications.txt' spec.
-
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -45,9 +46,9 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @param CalDAV\Backend\NotificationSupport $caldavBackend
      * @param string $principalUri
-     * @param CalDAV\Notifications\INotificationType $notification
+     * @param NotificationInterface $notification
      */
-    public function __construct(CalDAV\Backend\NotificationSupport $caldavBackend, $principalUri, INotificationType $notification) {
+    function __construct(CalDAV\Backend\NotificationSupport $caldavBackend, $principalUri, NotificationInterface $notification) {
 
         $this->caldavBackend = $caldavBackend;
         $this->principalUri = $principalUri;
@@ -60,7 +61,7 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return id
      */
-    public function getName() {
+    function getName() {
 
         return $this->notification->getId() . '.xml';
 
@@ -73,7 +74,7 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return string
      */
-    public function getETag() {
+    function getETag() {
 
         return $this->notification->getETag();
 
@@ -85,7 +86,7 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return INotificationType
      */
-    public function getNotificationType() {
+    function getNotificationType() {
 
         return $this->notification;
 
@@ -96,7 +97,7 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return void
      */
-    public function delete() {
+    function delete() {
 
         $this->caldavBackend->deleteNotification($this->getOwner(), $this->notification);
 
@@ -109,7 +110,7 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return string|null
      */
-    public function getOwner() {
+    function getOwner() {
 
         return $this->principalUri;
 
@@ -122,7 +123,7 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return string|null
      */
-    public function getGroup() {
+    function getGroup() {
 
         return null;
 
@@ -140,20 +141,20 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
 
-        return array(
-            array(
+        return [
+            [
                 'principal' => $this->getOwner(),
                 'privilege' => '{DAV:}read',
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'principal' => $this->getOwner(),
                 'privilege' => '{DAV:}write',
                 'protected' => true,
-            )
-        );
+            ]
+        ];
 
     }
 
@@ -165,7 +166,7 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      * @param array $acl
      * @return void
      */
-    public function setACL(array $acl) {
+    function setACL(array $acl) {
 
         throw new DAV\Exception\NotImplemented('Updating ACLs is not implemented here');
 
@@ -183,7 +184,7 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return array|null
      */
-    public function getSupportedPrivilegeSet() {
+    function getSupportedPrivilegeSet() {
 
         return null;
 
diff --git a/vendor/sabre/dav/lib/CalDAV/Notifications/Plugin.php b/vendor/sabre/dav/lib/CalDAV/Notifications/Plugin.php
new file mode 100644
index 000000000..546bf927f
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/Plugin.php
@@ -0,0 +1,180 @@
+<?php
+
+namespace Sabre\CalDAV\Notifications;
+
+use Sabre\DAV;
+use Sabre\DAV\PropFind;
+use Sabre\DAV\INode as BaseINode;
+use Sabre\DAV\ServerPlugin;
+use Sabre\DAV\Server;
+use Sabre\DAVACL;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * Notifications plugin
+ *
+ * This plugin implements several features required by the caldav-notification
+ * draft specification.
+ *
+ * Before version 2.1.0 this functionality was part of Sabre\CalDAV\Plugin but
+ * this has since been split up.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends ServerPlugin {
+
+    /**
+     * This is the namespace for the proprietary calendarserver extensions
+     */
+    const NS_CALENDARSERVER = 'http://calendarserver.org/ns/';
+
+    /**
+     * Reference to the main server object.
+     *
+     * @var Server
+     */
+    protected $server;
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using \Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'notifications';
+
+    }
+
+    /**
+     * This initializes the plugin.
+     *
+     * This function is called by Sabre\DAV\Server, after
+     * addPlugin is called.
+     *
+     * This method should set up the required event subscriptions.
+     *
+     * @param Server $server
+     * @return void
+     */
+    function initialize(Server $server) {
+
+        $this->server = $server;
+        $server->on('method:GET', [$this, 'httpGet'], 90);
+        $server->on('propFind',   [$this, 'propFind']);
+
+        $server->xml->namespaceMap[self::NS_CALENDARSERVER] = 'cs';
+        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Notifications\\ICollection'] = '{' . self::NS_CALENDARSERVER . '}notification';
+
+        array_push($server->protectedProperties,
+            '{' . self::NS_CALENDARSERVER . '}notification-URL',
+            '{' . self::NS_CALENDARSERVER . '}notificationtype'
+        );
+
+    }
+
+    /**
+     * PropFind
+     *
+     * @param PropFind $propFind
+     * @param BaseINode $node
+     * @return void
+     */
+    function propFind(PropFind $propFind, BaseINode $node) {
+
+        $caldavPlugin = $this->server->getPlugin('caldav');
+
+        if ($node instanceof DAVACL\IPrincipal) {
+
+            $principalUrl = $node->getPrincipalUrl();
+
+            // notification-URL property
+            $propFind->handle('{' . self::NS_CALENDARSERVER . '}notification-URL', function() use ($principalUrl, $caldavPlugin) {
+
+                $notificationPath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl) . '/notifications/';
+                return new DAV\Xml\Property\Href($notificationPath);
+
+            });
+
+        }
+
+        if ($node instanceof INode) {
+
+            $propFind->handle(
+                '{' . self::NS_CALENDARSERVER . '}notificationtype',
+                [$node, 'getNotificationType']
+            );
+
+        }
+
+    }
+
+    /**
+     * This event is triggered before the usual GET request handler.
+     *
+     * We use this to intercept GET calls to notification nodes, and return the
+     * proper response.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function httpGet(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+
+        try {
+            $node = $this->server->tree->getNodeForPath($path);
+        } catch (DAV\Exception\NotFound $e) {
+            return;
+        }
+
+        if (!$node instanceof INode)
+            return;
+
+        $writer = $this->server->xml->getWriter();
+        $writer->contextUri = $this->server->getBaseUri();
+        $writer->openMemory();
+        $writer->startDocument('1.0', 'UTF-8');
+        $writer->startElement('{http://calendarserver.org/ns/}notification');
+        $node->getNotificationType()->xmlSerializeFull($writer);
+        $writer->endElement();
+
+        $response->setHeader('Content-Type', 'application/xml');
+        $response->setHeader('ETag', $node->getETag());
+        $response->setStatus(200);
+        $response->setBody($writer->outputMemory());
+
+        // Return false to break the event chain.
+        return false;
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Adds support for caldav-notifications, which is required to enable caldav-sharing.',
+            'link'        => 'http://sabre.io/dav/caldav-sharing/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Plugin.php b/vendor/sabre/dav/lib/CalDAV/Plugin.php
new file mode 100644
index 000000000..663490023
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Plugin.php
@@ -0,0 +1,1025 @@
+<?php
+
+namespace Sabre\CalDAV;
+
+use DateTimeZone;
+use Sabre\DAV;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\DAV\MkCol;
+use Sabre\DAV\Xml\Property\Href;
+use Sabre\DAVACL;
+use Sabre\VObject;
+use Sabre\HTTP;
+use Sabre\Uri;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * CalDAV plugin
+ *
+ * This plugin provides functionality added by CalDAV (RFC 4791)
+ * It implements new reports, and the MKCALENDAR method.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends DAV\ServerPlugin {
+
+    /**
+     * This is the official CalDAV namespace
+     */
+    const NS_CALDAV = 'urn:ietf:params:xml:ns:caldav';
+
+    /**
+     * This is the namespace for the proprietary calendarserver extensions
+     */
+    const NS_CALENDARSERVER = 'http://calendarserver.org/ns/';
+
+    /**
+     * The hardcoded root for calendar objects. It is unfortunate
+     * that we're stuck with it, but it will have to do for now
+     */
+    const CALENDAR_ROOT = 'calendars';
+
+    /**
+     * Reference to server object
+     *
+     * @var DAV\Server
+     */
+    protected $server;
+
+    /**
+     * The default PDO storage uses a MySQL MEDIUMBLOB for iCalendar data,
+     * which can hold up to 2^24 = 16777216 bytes. This is plenty. We're
+     * capping it to 10M here.
+     */
+    protected $maxResourceSize = 10000000;
+
+    /**
+     * Use this method to tell the server this plugin defines additional
+     * HTTP methods.
+     *
+     * This method is passed a uri. It should only return HTTP methods that are
+     * available for the specified uri.
+     *
+     * @param string $uri
+     * @return array
+     */
+    function getHTTPMethods($uri) {
+
+        // The MKCALENDAR is only available on unmapped uri's, whose
+        // parents extend IExtendedCollection
+        list($parent, $name) = Uri\split($uri);
+
+        $node = $this->server->tree->getNodeForPath($parent);
+
+        if ($node instanceof DAV\IExtendedCollection) {
+            try {
+                $node->getChild($name);
+            } catch (DAV\Exception\NotFound $e) {
+                return ['MKCALENDAR'];
+            }
+        }
+        return [];
+
+    }
+
+    /**
+     * Returns the path to a principal's calendar home.
+     *
+     * The return url must not end with a slash.
+     * This function should return null in case a principal did not have
+     * a calendar home.
+     *
+     * @param string $principalUrl
+     * @return string
+     */
+    function getCalendarHomeForPrincipal($principalUrl) {
+
+        // The default behavior for most sabre/dav servers is that there is a
+        // principals root node, which contains users directly under it.
+        //
+        // This function assumes that there are two components in a principal
+        // path. If there's more, we don't return a calendar home. This
+        // excludes things like the calendar-proxy-read principal (which it
+        // should).
+        $parts = explode('/', trim($principalUrl, '/'));
+        if (count($parts) !== 2) return;
+        if ($parts[0] !== 'principals') return;
+
+        return self::CALENDAR_ROOT . '/' . $parts[1];
+
+    }
+
+    /**
+     * Returns a list of features for the DAV: HTTP header.
+     *
+     * @return array
+     */
+    function getFeatures() {
+
+        return ['calendar-access', 'calendar-proxy'];
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'caldav';
+
+    }
+
+    /**
+     * Returns a list of reports this plugin supports.
+     *
+     * This will be used in the {DAV:}supported-report-set property.
+     * Note that you still need to subscribe to the 'report' event to actually
+     * implement them
+     *
+     * @param string $uri
+     * @return array
+     */
+    function getSupportedReportSet($uri) {
+
+        $node = $this->server->tree->getNodeForPath($uri);
+
+        $reports = [];
+        if ($node instanceof ICalendarObjectContainer || $node instanceof ICalendarObject) {
+            $reports[] = '{' . self::NS_CALDAV . '}calendar-multiget';
+            $reports[] = '{' . self::NS_CALDAV . '}calendar-query';
+        }
+        if ($node instanceof ICalendar) {
+            $reports[] = '{' . self::NS_CALDAV . '}free-busy-query';
+        }
+        // iCal has a bug where it assumes that sync support is enabled, only
+        // if we say we support it on the calendar-home, even though this is
+        // not actually the case.
+        if ($node instanceof CalendarHome && $this->server->getPlugin('sync')) {
+            $reports[] = '{DAV:}sync-collection';
+        }
+        return $reports;
+
+    }
+
+    /**
+     * Initializes the plugin
+     *
+     * @param DAV\Server $server
+     * @return void
+     */
+    function initialize(DAV\Server $server) {
+
+        $this->server = $server;
+
+        $server->on('method:MKCALENDAR',   [$this, 'httpMkCalendar']);
+        $server->on('report',              [$this, 'report']);
+        $server->on('propFind',            [$this, 'propFind']);
+        $server->on('onHTMLActionsPanel',  [$this, 'htmlActionsPanel']);
+        $server->on('beforeCreateFile',    [$this, 'beforeCreateFile']);
+        $server->on('beforeWriteContent',  [$this, 'beforeWriteContent']);
+        $server->on('afterMethod:GET',     [$this, 'httpAfterGET']);
+
+        $server->xml->namespaceMap[self::NS_CALDAV] = 'cal';
+        $server->xml->namespaceMap[self::NS_CALENDARSERVER] = 'cs';
+
+        $server->xml->elementMap['{' . self::NS_CALDAV . '}supported-calendar-component-set'] = 'Sabre\\CalDAV\\Xml\\Property\\SupportedCalendarComponentSet';
+        $server->xml->elementMap['{' . self::NS_CALDAV . '}calendar-query'] = 'Sabre\\CalDAV\\Xml\\Request\\CalendarQueryReport';
+        $server->xml->elementMap['{' . self::NS_CALDAV . '}calendar-multiget'] = 'Sabre\\CalDAV\\Xml\\Request\\CalendarMultiGetReport';
+        $server->xml->elementMap['{' . self::NS_CALDAV . '}free-busy-query'] = 'Sabre\\CalDAV\\Xml\\Request\\FreeBusyQueryReport';
+        $server->xml->elementMap['{' . self::NS_CALDAV . '}mkcalendar'] = 'Sabre\\CalDAV\\Xml\\Request\\MkCalendar';
+        $server->xml->elementMap['{' . self::NS_CALDAV . '}schedule-calendar-transp'] = 'Sabre\\CalDAV\\Xml\\Property\\ScheduleCalendarTransp';
+        $server->xml->elementMap['{' . self::NS_CALDAV . '}supported-calendar-component-set'] = 'Sabre\\CalDAV\\Xml\\Property\\SupportedCalendarComponentSet';
+
+        $server->resourceTypeMapping['\\Sabre\\CalDAV\\ICalendar'] = '{urn:ietf:params:xml:ns:caldav}calendar';
+
+        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Principal\\IProxyRead'] = '{http://calendarserver.org/ns/}calendar-proxy-read';
+        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Principal\\IProxyWrite'] = '{http://calendarserver.org/ns/}calendar-proxy-write';
+
+        array_push($server->protectedProperties,
+
+            '{' . self::NS_CALDAV . '}supported-calendar-component-set',
+            '{' . self::NS_CALDAV . '}supported-calendar-data',
+            '{' . self::NS_CALDAV . '}max-resource-size',
+            '{' . self::NS_CALDAV . '}min-date-time',
+            '{' . self::NS_CALDAV . '}max-date-time',
+            '{' . self::NS_CALDAV . '}max-instances',
+            '{' . self::NS_CALDAV . '}max-attendees-per-instance',
+            '{' . self::NS_CALDAV . '}calendar-home-set',
+            '{' . self::NS_CALDAV . '}supported-collation-set',
+            '{' . self::NS_CALDAV . '}calendar-data',
+
+            // CalendarServer extensions
+            '{' . self::NS_CALENDARSERVER . '}getctag',
+            '{' . self::NS_CALENDARSERVER . '}calendar-proxy-read-for',
+            '{' . self::NS_CALENDARSERVER . '}calendar-proxy-write-for'
+
+        );
+
+        if ($aclPlugin = $server->getPlugin('acl')) {
+            $aclPlugin->principalSearchPropertySet['{' . self::NS_CALDAV . '}calendar-user-address-set'] = 'Calendar address';
+        }
+    }
+
+    /**
+     * This functions handles REPORT requests specific to CalDAV
+     *
+     * @param string $reportName
+     * @param mixed $report
+     * @return bool
+     */
+    function report($reportName, $report) {
+
+        switch ($reportName) {
+            case '{' . self::NS_CALDAV . '}calendar-multiget' :
+                $this->server->transactionType = 'report-calendar-multiget';
+                $this->calendarMultiGetReport($report);
+                return false;
+            case '{' . self::NS_CALDAV . '}calendar-query' :
+                $this->server->transactionType = 'report-calendar-query';
+                $this->calendarQueryReport($report);
+                return false;
+            case '{' . self::NS_CALDAV . '}free-busy-query' :
+                $this->server->transactionType = 'report-free-busy-query';
+                $this->freeBusyQueryReport($report);
+                return false;
+
+        }
+
+
+    }
+
+    /**
+     * This function handles the MKCALENDAR HTTP method, which creates
+     * a new calendar.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpMkCalendar(RequestInterface $request, ResponseInterface $response) {
+
+        $body = $request->getBodyAsString();
+        $path = $request->getPath();
+
+        $properties = [];
+
+        if ($body) {
+
+            try {
+                $mkcalendar = $this->server->xml->expect(
+                    '{urn:ietf:params:xml:ns:caldav}mkcalendar',
+                    $body
+                );
+            } catch (\Sabre\Xml\ParseException $e) {
+                throw new BadRequest($e->getMessage(), null, $e);
+            }
+            $properties = $mkcalendar->getProperties();
+
+        }
+
+        // iCal abuses MKCALENDAR since iCal 10.9.2 to create server-stored
+        // subscriptions. Before that it used MKCOL which was the correct way
+        // to do this.
+        //
+        // If the body had a {DAV:}resourcetype, it means we stumbled upon this
+        // request, and we simply use it instead of the pre-defined list.
+        if (isset($properties['{DAV:}resourcetype'])) {
+            $resourceType = $properties['{DAV:}resourcetype']->getValue();
+        } else {
+            $resourceType = ['{DAV:}collection','{urn:ietf:params:xml:ns:caldav}calendar'];
+        }
+
+        $this->server->createCollection($path, new MkCol($resourceType, $properties));
+
+        $this->server->httpResponse->setStatus(201);
+        $this->server->httpResponse->setHeader('Content-Length', 0);
+
+        // This breaks the method chain.
+        return false;
+    }
+
+    /**
+     * PropFind
+     *
+     * This method handler is invoked before any after properties for a
+     * resource are fetched. This allows us to add in any CalDAV specific
+     * properties.
+     *
+     * @param DAV\PropFind $propFind
+     * @param DAV\INode $node
+     * @return void
+     */
+    function propFind(DAV\PropFind $propFind, DAV\INode $node) {
+
+        $ns = '{' . self::NS_CALDAV . '}';
+
+        if ($node instanceof ICalendarObjectContainer) {
+
+            $propFind->handle($ns . 'max-resource-size', $this->maxResourceSize);
+            $propFind->handle($ns . 'supported-calendar-data', function() {
+                return new Xml\Property\SupportedCalendarData();
+            });
+            $propFind->handle($ns . 'supported-collation-set', function() {
+                return new Xml\Property\SupportedCollationSet();
+            });
+
+        }
+
+        if ($node instanceof DAVACL\IPrincipal) {
+
+            $principalUrl = $node->getPrincipalUrl();
+
+            $propFind->handle('{' . self::NS_CALDAV . '}calendar-home-set', function() use ($principalUrl) {
+
+                $calendarHomePath = $this->getCalendarHomeForPrincipal($principalUrl);
+                if (is_null($calendarHomePath)) return null;
+                return new Href($calendarHomePath . '/');
+
+            });
+            // The calendar-user-address-set property is basically mapped to
+            // the {DAV:}alternate-URI-set property.
+            $propFind->handle('{' . self::NS_CALDAV . '}calendar-user-address-set', function() use ($node) {
+                $addresses = $node->getAlternateUriSet();
+                $addresses[] = $this->server->getBaseUri() . $node->getPrincipalUrl() . '/';
+                return new Href($addresses, false);
+            });
+            // For some reason somebody thought it was a good idea to add
+            // another one of these properties. We're supporting it too.
+            $propFind->handle('{' . self::NS_CALENDARSERVER . '}email-address-set', function() use ($node) {
+                $addresses = $node->getAlternateUriSet();
+                $emails = [];
+                foreach ($addresses as $address) {
+                    if (substr($address, 0, 7) === 'mailto:') {
+                        $emails[] = substr($address, 7);
+                    }
+                }
+                return new Xml\Property\EmailAddressSet($emails);
+            });
+
+            // These two properties are shortcuts for ical to easily find
+            // other principals this principal has access to.
+            $propRead = '{' . self::NS_CALENDARSERVER . '}calendar-proxy-read-for';
+            $propWrite = '{' . self::NS_CALENDARSERVER . '}calendar-proxy-write-for';
+
+            if ($propFind->getStatus($propRead) === 404 || $propFind->getStatus($propWrite) === 404) {
+
+                $aclPlugin = $this->server->getPlugin('acl');
+                $membership = $aclPlugin->getPrincipalMembership($propFind->getPath());
+                $readList = [];
+                $writeList = [];
+
+                foreach ($membership as $group) {
+
+                    $groupNode = $this->server->tree->getNodeForPath($group);
+
+                    $listItem = Uri\split($group)[0] . '/';
+
+                    // If the node is either ap proxy-read or proxy-write
+                    // group, we grab the parent principal and add it to the
+                    // list.
+                    if ($groupNode instanceof Principal\IProxyRead) {
+                        $readList[] = $listItem;
+                    }
+                    if ($groupNode instanceof Principal\IProxyWrite) {
+                        $writeList[] = $listItem;
+                    }
+
+                }
+
+                $propFind->set($propRead, new Href($readList));
+                $propFind->set($propWrite, new Href($writeList));
+
+            }
+
+        } // instanceof IPrincipal
+
+        if ($node instanceof ICalendarObject) {
+
+            // The calendar-data property is not supposed to be a 'real'
+            // property, but in large chunks of the spec it does act as such.
+            // Therefore we simply expose it as a property.
+            $propFind->handle('{' . self::NS_CALDAV . '}calendar-data', function() use ($node) {
+                $val = $node->get();
+                if (is_resource($val))
+                    $val = stream_get_contents($val);
+
+                // Taking out \r to not screw up the xml output
+                return str_replace("\r", "", $val);
+
+            });
+
+        }
+
+    }
+
+    /**
+     * This function handles the calendar-multiget REPORT.
+     *
+     * This report is used by the client to fetch the content of a series
+     * of urls. Effectively avoiding a lot of redundant requests.
+     *
+     * @param CalendarMultiGetReport $report
+     * @return void
+     */
+    function calendarMultiGetReport($report) {
+
+        $needsJson = $report->contentType === 'application/calendar+json';
+
+        $timeZones = [];
+        $propertyList = [];
+
+        $paths = array_map(
+            [$this->server, 'calculateUri'],
+            $report->hrefs
+        );
+
+        foreach ($this->server->getPropertiesForMultiplePaths($paths, $report->properties) as $uri => $objProps) {
+
+            if (($needsJson || $report->expand) && isset($objProps[200]['{' . self::NS_CALDAV . '}calendar-data'])) {
+                $vObject = VObject\Reader::read($objProps[200]['{' . self::NS_CALDAV . '}calendar-data']);
+
+                if ($report->expand) {
+                    // We're expanding, and for that we need to figure out the
+                    // calendar's timezone.
+                    list($calendarPath) = Uri\split($uri);
+                    if (!isset($timeZones[$calendarPath])) {
+                        // Checking the calendar-timezone property.
+                        $tzProp = '{' . self::NS_CALDAV . '}calendar-timezone';
+                        $tzResult = $this->server->getProperties($calendarPath, [$tzProp]);
+                        if (isset($tzResult[$tzProp])) {
+                            // This property contains a VCALENDAR with a single
+                            // VTIMEZONE.
+                            $vtimezoneObj = VObject\Reader::read($tzResult[$tzProp]);
+                            $timeZone = $vtimezoneObj->VTIMEZONE->getTimeZone();
+                        } else {
+                            // Defaulting to UTC.
+                            $timeZone = new DateTimeZone('UTC');
+                        }
+                        $timeZones[$calendarPath] = $timeZone;
+                    }
+
+                    $vObject = $vObject->expand($report->expand['start'], $report->expand['end'], $timeZones[$calendarPath]);
+                }
+                if ($needsJson) {
+                    $objProps[200]['{' . self::NS_CALDAV . '}calendar-data'] = json_encode($vObject->jsonSerialize());
+                } else {
+                    $objProps[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
+                }
+                // Destroy circular references so PHP will garbage collect the
+                // object.
+                $vObject->destroy();
+            }
+
+            $propertyList[] = $objProps;
+
+        }
+
+        $prefer = $this->server->getHTTPPrefer();
+
+        $this->server->httpResponse->setStatus(207);
+        $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $this->server->httpResponse->setHeader('Vary', 'Brief,Prefer');
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($propertyList, $prefer['return'] === 'minimal'));
+
+    }
+
+    /**
+     * This function handles the calendar-query REPORT
+     *
+     * This report is used by clients to request calendar objects based on
+     * complex conditions.
+     *
+     * @param Xml\Request\CalendarQueryReport $report
+     * @return void
+     */
+    function calendarQueryReport($report) {
+
+        $path = $this->server->getRequestUri();
+
+        $needsJson = $report->contentType === 'application/calendar+json';
+
+        $node = $this->server->tree->getNodeForPath($this->server->getRequestUri());
+        $depth = $this->server->getHTTPDepth(0);
+
+        // The default result is an empty array
+        $result = [];
+
+        $calendarTimeZone = null;
+        if ($report->expand) {
+            // We're expanding, and for that we need to figure out the
+            // calendar's timezone.
+            $tzProp = '{' . self::NS_CALDAV . '}calendar-timezone';
+            $tzResult = $this->server->getProperties($path, [$tzProp]);
+            if (isset($tzResult[$tzProp])) {
+                // This property contains a VCALENDAR with a single
+                // VTIMEZONE.
+                $vtimezoneObj = VObject\Reader::read($tzResult[$tzProp]);
+                $calendarTimeZone = $vtimezoneObj->VTIMEZONE->getTimeZone();
+
+                // Destroy circular references so PHP will garbage collect the
+                // object.
+                $vtimezoneObj->destroy();
+            } else {
+                // Defaulting to UTC.
+                $calendarTimeZone = new DateTimeZone('UTC');
+            }
+        }
+
+        // The calendarobject was requested directly. In this case we handle
+        // this locally.
+        if ($depth == 0 && $node instanceof ICalendarObject) {
+
+            $requestedCalendarData = true;
+            $requestedProperties = $report->properties;
+
+            if (!in_array('{urn:ietf:params:xml:ns:caldav}calendar-data', $requestedProperties)) {
+
+                // We always retrieve calendar-data, as we need it for filtering.
+                $requestedProperties[] = '{urn:ietf:params:xml:ns:caldav}calendar-data';
+
+                // If calendar-data wasn't explicitly requested, we need to remove
+                // it after processing.
+                $requestedCalendarData = false;
+            }
+
+            $properties = $this->server->getPropertiesForPath(
+                $path,
+                $requestedProperties,
+                0
+            );
+
+            // This array should have only 1 element, the first calendar
+            // object.
+            $properties = current($properties);
+
+            // If there wasn't any calendar-data returned somehow, we ignore
+            // this.
+            if (isset($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data'])) {
+
+                $validator = new CalendarQueryValidator();
+
+                $vObject = VObject\Reader::read($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
+                if ($validator->validate($vObject, $report->filters)) {
+
+                    // If the client didn't require the calendar-data property,
+                    // we won't give it back.
+                    if (!$requestedCalendarData) {
+                        unset($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
+                    } else {
+
+
+                        if ($report->expand) {
+                            $vObject = $vObject->expand($report->expand['start'], $report->expand['end'], $calendarTimeZone);
+                        }
+                        if ($needsJson) {
+                            $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = json_encode($vObject->jsonSerialize());
+                        } elseif ($report->expand) {
+                            $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
+                        }
+                    }
+
+                    $result = [$properties];
+
+                }
+                // Destroy circular references so PHP will garbage collect the
+                // object.
+                $vObject->destroy();
+
+            }
+
+        }
+
+        if ($node instanceof ICalendarObjectContainer && $depth === 0) {
+
+            if (strpos($this->server->httpRequest->getHeader('User-Agent'), 'MSFT-') === 0) {
+                // Microsoft clients incorrectly supplied depth as 0, when it actually
+                // should have set depth to 1. We're implementing a workaround here
+                // to deal with this.
+                //
+                // This targets at least the following clients:
+                //   Windows 10
+                //   Windows Phone 8, 10
+                $depth = 1;
+            } else {
+                throw new BadRequest('A calendar-query REPORT on a calendar with a Depth: 0 is undefined. Set Depth to 1');
+            }
+
+        }
+
+        // If we're dealing with a calendar, the calendar itself is responsible
+        // for the calendar-query.
+        if ($node instanceof ICalendarObjectContainer && $depth == 1) {
+
+            $nodePaths = $node->calendarQuery($report->filters);
+
+            foreach ($nodePaths as $path) {
+
+                list($properties) =
+                    $this->server->getPropertiesForPath($this->server->getRequestUri() . '/' . $path, $report->properties);
+
+                if (($needsJson || $report->expand)) {
+                    $vObject = VObject\Reader::read($properties[200]['{' . self::NS_CALDAV . '}calendar-data']);
+
+                    if ($report->expand) {
+                        $vObject = $vObject->expand($report->expand['start'], $report->expand['end'], $calendarTimeZone);
+                    }
+
+                    if ($needsJson) {
+                        $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = json_encode($vObject->jsonSerialize());
+                    } else {
+                        $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
+                    }
+
+                    // Destroy circular references so PHP will garbage collect the
+                    // object.
+                    $vObject->destroy();
+                }
+                $result[] = $properties;
+
+            }
+
+        }
+
+        $prefer = $this->server->getHTTPPrefer();
+
+        $this->server->httpResponse->setStatus(207);
+        $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $this->server->httpResponse->setHeader('Vary', 'Brief,Prefer');
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($result, $prefer['return'] === 'minimal'));
+
+    }
+
+    /**
+     * This method is responsible for parsing the request and generating the
+     * response for the CALDAV:free-busy-query REPORT.
+     *
+     * @param Xml\Request\FreeBusyQueryReport $report
+     * @return void
+     */
+    protected function freeBusyQueryReport(Xml\Request\FreeBusyQueryReport $report) {
+
+        $uri = $this->server->getRequestUri();
+
+        $acl = $this->server->getPlugin('acl');
+        if ($acl) {
+            $acl->checkPrivileges($uri, '{' . self::NS_CALDAV . '}read-free-busy');
+        }
+
+        $calendar = $this->server->tree->getNodeForPath($uri);
+        if (!$calendar instanceof ICalendar) {
+            throw new DAV\Exception\NotImplemented('The free-busy-query REPORT is only implemented on calendars');
+        }
+
+        $tzProp = '{' . self::NS_CALDAV . '}calendar-timezone';
+
+        // Figuring out the default timezone for the calendar, for floating
+        // times.
+        $calendarProps = $this->server->getProperties($uri, [$tzProp]);
+
+        if (isset($calendarProps[$tzProp])) {
+            $vtimezoneObj = VObject\Reader::read($calendarProps[$tzProp]);
+            $calendarTimeZone = $vtimezoneObj->VTIMEZONE->getTimeZone();
+            // Destroy circular references so PHP will garbage collect the object.
+            $vtimezoneObj->destroy();
+        } else {
+            $calendarTimeZone = new DateTimeZone('UTC');
+        }
+
+        // Doing a calendar-query first, to make sure we get the most
+        // performance.
+        $urls = $calendar->calendarQuery([
+            'name'         => 'VCALENDAR',
+            'comp-filters' => [
+                [
+                    'name'           => 'VEVENT',
+                    'comp-filters'   => [],
+                    'prop-filters'   => [],
+                    'is-not-defined' => false,
+                    'time-range'     => [
+                        'start' => $report->start,
+                        'end'   => $report->end,
+                    ],
+                ],
+            ],
+            'prop-filters'   => [],
+            'is-not-defined' => false,
+            'time-range'     => null,
+        ]);
+
+        $objects = array_map(function($url) use ($calendar) {
+            $obj = $calendar->getChild($url)->get();
+            return $obj;
+        }, $urls);
+
+        $generator = new VObject\FreeBusyGenerator();
+        $generator->setObjects($objects);
+        $generator->setTimeRange($report->start, $report->end);
+        $generator->setTimeZone($calendarTimeZone);
+        $result = $generator->getResult();
+        $result = $result->serialize();
+
+        $this->server->httpResponse->setStatus(200);
+        $this->server->httpResponse->setHeader('Content-Type', 'text/calendar');
+        $this->server->httpResponse->setHeader('Content-Length', strlen($result));
+        $this->server->httpResponse->setBody($result);
+
+    }
+
+    /**
+     * This method is triggered before a file gets updated with new content.
+     *
+     * This plugin uses this method to ensure that CalDAV objects receive
+     * valid calendar data.
+     *
+     * @param string $path
+     * @param DAV\IFile $node
+     * @param resource $data
+     * @param bool $modified Should be set to true, if this event handler
+     *                       changed &$data.
+     * @return void
+     */
+    function beforeWriteContent($path, DAV\IFile $node, &$data, &$modified) {
+
+        if (!$node instanceof ICalendarObject)
+            return;
+
+        // We're onyl interested in ICalendarObject nodes that are inside of a
+        // real calendar. This is to avoid triggering validation and scheduling
+        // for non-calendars (such as an inbox).
+        list($parent) = Uri\split($path);
+        $parentNode = $this->server->tree->getNodeForPath($parent);
+
+        if (!$parentNode instanceof ICalendar)
+            return;
+
+        $this->validateICalendar(
+            $data,
+            $path,
+            $modified,
+            $this->server->httpRequest,
+            $this->server->httpResponse,
+            false
+        );
+
+    }
+
+    /**
+     * This method is triggered before a new file is created.
+     *
+     * This plugin uses this method to ensure that newly created calendar
+     * objects contain valid calendar data.
+     *
+     * @param string $path
+     * @param resource $data
+     * @param DAV\ICollection $parentNode
+     * @param bool $modified Should be set to true, if this event handler
+     *                       changed &$data.
+     * @return void
+     */
+    function beforeCreateFile($path, &$data, DAV\ICollection $parentNode, &$modified) {
+
+        if (!$parentNode instanceof ICalendar)
+            return;
+
+        $this->validateICalendar(
+            $data,
+            $path,
+            $modified,
+            $this->server->httpRequest,
+            $this->server->httpResponse,
+            true
+        );
+
+    }
+
+    /**
+     * Checks if the submitted iCalendar data is in fact, valid.
+     *
+     * An exception is thrown if it's not.
+     *
+     * @param resource|string $data
+     * @param string $path
+     * @param bool $modified Should be set to true, if this event handler
+     *                       changed &$data.
+     * @param RequestInterface $request The http request.
+     * @param ResponseInterface $response The http response.
+     * @param bool $isNew Is the item a new one, or an update.
+     * @return void
+     */
+    protected function validateICalendar(&$data, $path, &$modified, RequestInterface $request, ResponseInterface $response, $isNew) {
+
+        // If it's a stream, we convert it to a string first.
+        if (is_resource($data)) {
+            $data = stream_get_contents($data);
+        }
+
+        $before = md5($data);
+        // Converting the data to unicode, if needed.
+        $data = DAV\StringUtil::ensureUTF8($data);
+
+        if ($before !== md5($data)) $modified = true;
+
+        try {
+
+            // If the data starts with a [, we can reasonably assume we're dealing
+            // with a jCal object.
+            if (substr($data, 0, 1) === '[') {
+                $vobj = VObject\Reader::readJson($data);
+
+                // Converting $data back to iCalendar, as that's what we
+                // technically support everywhere.
+                $data = $vobj->serialize();
+                $modified = true;
+            } else {
+                $vobj = VObject\Reader::read($data);
+            }
+
+        } catch (VObject\ParseException $e) {
+
+            throw new DAV\Exception\UnsupportedMediaType('This resource only supports valid iCalendar 2.0 data. Parse error: ' . $e->getMessage());
+
+        }
+
+        if ($vobj->name !== 'VCALENDAR') {
+            throw new DAV\Exception\UnsupportedMediaType('This collection can only support iCalendar objects.');
+        }
+
+        $sCCS = '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set';
+
+        // Get the Supported Components for the target calendar
+        list($parentPath) = Uri\split($path);
+        $calendarProperties = $this->server->getProperties($parentPath, [$sCCS]);
+
+        if (isset($calendarProperties[$sCCS])) {
+            $supportedComponents = $calendarProperties[$sCCS]->getValue();
+        } else {
+            $supportedComponents = ['VJOURNAL', 'VTODO', 'VEVENT'];
+        }
+
+        $foundType = null;
+        $foundUID = null;
+        foreach ($vobj->getComponents() as $component) {
+            switch ($component->name) {
+                case 'VTIMEZONE' :
+                    continue 2;
+                case 'VEVENT' :
+                case 'VTODO' :
+                case 'VJOURNAL' :
+                    if (is_null($foundType)) {
+                        $foundType = $component->name;
+                        if (!in_array($foundType, $supportedComponents)) {
+                            throw new Exception\InvalidComponentType('This calendar only supports ' . implode(', ', $supportedComponents) . '. We found a ' . $foundType);
+                        }
+                        if (!isset($component->UID)) {
+                            throw new DAV\Exception\BadRequest('Every ' . $component->name . ' component must have an UID');
+                        }
+                        $foundUID = (string)$component->UID;
+                    } else {
+                        if ($foundType !== $component->name) {
+                            throw new DAV\Exception\BadRequest('A calendar object must only contain 1 component. We found a ' . $component->name . ' as well as a ' . $foundType);
+                        }
+                        if ($foundUID !== (string)$component->UID) {
+                            throw new DAV\Exception\BadRequest('Every ' . $component->name . ' in this object must have identical UIDs');
+                        }
+                    }
+                    break;
+                default :
+                    throw new DAV\Exception\BadRequest('You are not allowed to create components of type: ' . $component->name . ' here');
+
+            }
+        }
+        if (!$foundType)
+            throw new DAV\Exception\BadRequest('iCalendar object must contain at least 1 of VEVENT, VTODO or VJOURNAL');
+
+        // We use an extra variable to allow event handles to tell us wether
+        // the object was modified or not.
+        //
+        // This helps us determine if we need to re-serialize the object.
+        $subModified = false;
+
+        $this->server->emit(
+            'calendarObjectChange',
+            [
+                $request,
+                $response,
+                $vobj,
+                $parentPath,
+                &$subModified,
+                $isNew
+            ]
+        );
+
+        if ($subModified) {
+            // An event handler told us that it modified the object.
+            $data = $vobj->serialize();
+
+            // Using md5 to figure out if there was an *actual* change.
+            if (!$modified && $before !== md5($data)) {
+                $modified = true;
+            }
+
+        }
+
+        // Destroy circular references so PHP will garbage collect the object.
+        $vobj->destroy();
+
+    }
+
+
+    /**
+     * This method is used to generate HTML output for the
+     * DAV\Browser\Plugin. This allows us to generate an interface users
+     * can use to create new calendars.
+     *
+     * @param DAV\INode $node
+     * @param string $output
+     * @return bool
+     */
+    function htmlActionsPanel(DAV\INode $node, &$output) {
+
+        if (!$node instanceof CalendarHome)
+            return;
+
+        $output .= '<tr><td colspan="2"><form method="post" action="">
+            <h3>Create new calendar</h3>
+            <input type="hidden" name="sabreAction" value="mkcol" />
+            <input type="hidden" name="resourceType" value="{DAV:}collection,{' . self::NS_CALDAV . '}calendar" />
+            <label>Name (uri):</label> <input type="text" name="name" /><br />
+            <label>Display name:</label> <input type="text" name="{DAV:}displayname" /><br />
+            <input type="submit" value="create" />
+            </form>
+            </td></tr>';
+
+        return false;
+
+    }
+
+    /**
+     * This event is triggered after GET requests.
+     *
+     * This is used to transform data into jCal, if this was requested.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function httpAfterGet(RequestInterface $request, ResponseInterface $response) {
+
+        if (strpos($response->getHeader('Content-Type'), 'text/calendar') === false) {
+            return;
+        }
+
+        $result = HTTP\Util::negotiate(
+            $request->getHeader('Accept'),
+            ['text/calendar', 'application/calendar+json']
+        );
+
+        if ($result !== 'application/calendar+json') {
+            // Do nothing
+            return;
+        }
+
+        // Transforming.
+        $vobj = VObject\Reader::read($response->getBody());
+
+        $jsonBody = json_encode($vobj->jsonSerialize());
+        $response->setBody($jsonBody);
+
+        // Destroy circular references so PHP will garbage collect the object.
+        $vobj->destroy();
+
+        $response->setHeader('Content-Type', 'application/calendar+json');
+        $response->setHeader('Content-Length', strlen($jsonBody));
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Adds support for CalDAV (rfc4791)',
+            'link'        => 'http://sabre.io/dav/caldav/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/Collection.php b/vendor/sabre/dav/lib/CalDAV/Principal/Collection.php
index 8a747a644..e19719a76 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/Collection.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/Collection.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Sabre\CalDAV\Principal;
+
 use Sabre\DAVACL;
 
 /**
@@ -11,11 +12,11 @@ use Sabre\DAVACL;
  * calendar-proxy-write sub-principals, as defined by the caldav-proxy
  * specification.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Collection extends DAVACL\AbstractPrincipalCollection {
+class Collection extends DAVACL\PrincipalCollection {
 
     /**
      * Returns a child object based on principal information
@@ -23,7 +24,7 @@ class Collection extends DAVACL\AbstractPrincipalCollection {
      * @param array $principalInfo
      * @return User
      */
-    public function getChildForPrincipal(array $principalInfo) {
+    function getChildForPrincipal(array $principalInfo) {
 
         return new User($this->principalBackend, $principalInfo);
 
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/IProxyRead.php b/vendor/sabre/dav/lib/CalDAV/Principal/IProxyRead.php
index 548411fa8..7dd375932 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/IProxyRead.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/IProxyRead.php
@@ -10,7 +10,7 @@ use Sabre\DAVACL;
  * Any principal node implementing this interface will be picked up as a 'proxy
  * principal group'.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/IProxyWrite.php b/vendor/sabre/dav/lib/CalDAV/Principal/IProxyWrite.php
index f0e6e47cb..eda87a4ff 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/IProxyWrite.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/IProxyWrite.php
@@ -10,7 +10,7 @@ use Sabre\DAVACL;
  * Any principal node implementing this interface will be picked up as a 'proxy
  * principal group'.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/ProxyRead.php b/vendor/sabre/dav/lib/CalDAV/Principal/ProxyRead.php
index 62f66b98c..93f0fe095 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/ProxyRead.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/ProxyRead.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Sabre\CalDAV\Principal;
+
 use Sabre\DAVACL;
 use Sabre\DAV;
 
@@ -11,7 +12,7 @@ use Sabre\DAV;
  * This is needed to implement 'Calendar delegation' support. This class is
  * instantiated by User.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -39,7 +40,7 @@ class ProxyRead implements IProxyRead {
      * @param DAVACL\PrincipalBackend\BackendInterface $principalBackend
      * @param array $principalInfo
      */
-    public function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, array $principalInfo) {
+    function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, array $principalInfo) {
 
         $this->principalInfo = $principalInfo;
         $this->principalBackend = $principalBackend;
@@ -51,7 +52,7 @@ class ProxyRead implements IProxyRead {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return 'calendar-proxy-read';
 
@@ -62,7 +63,7 @@ class ProxyRead implements IProxyRead {
      *
      * @return null
      */
-    public function getLastModified() {
+    function getLastModified() {
 
         return null;
 
@@ -74,7 +75,7 @@ class ProxyRead implements IProxyRead {
      * @throws DAV\Exception\Forbidden
      * @return void
      */
-    public function delete() {
+    function delete() {
 
         throw new DAV\Exception\Forbidden('Permission denied to delete node');
 
@@ -87,7 +88,7 @@ class ProxyRead implements IProxyRead {
      * @param string $name The new name
      * @return void
      */
-    public function setName($name) {
+    function setName($name) {
 
         throw new DAV\Exception\Forbidden('Permission denied to rename file');
 
@@ -101,9 +102,9 @@ class ProxyRead implements IProxyRead {
      *
      * @return array
      */
-    public function getAlternateUriSet() {
+    function getAlternateUriSet() {
 
-        return array();
+        return [];
 
     }
 
@@ -112,7 +113,7 @@ class ProxyRead implements IProxyRead {
      *
      * @return string
      */
-    public function getPrincipalUrl() {
+    function getPrincipalUrl() {
 
         return $this->principalInfo['uri'] . '/' . $this->getName();
 
@@ -126,7 +127,7 @@ class ProxyRead implements IProxyRead {
      *
      * @return array
      */
-    public function getGroupMemberSet() {
+    function getGroupMemberSet() {
 
         return $this->principalBackend->getGroupMemberSet($this->getPrincipalUrl());
 
@@ -140,7 +141,7 @@ class ProxyRead implements IProxyRead {
      *
      * @return array
      */
-    public function getGroupMembership() {
+    function getGroupMembership() {
 
         return $this->principalBackend->getGroupMembership($this->getPrincipalUrl());
 
@@ -157,7 +158,7 @@ class ProxyRead implements IProxyRead {
      * @param array $principals
      * @return void
      */
-    public function setGroupMemberSet(array $principals) {
+    function setGroupMemberSet(array $principals) {
 
         $this->principalBackend->setGroupMemberSet($this->getPrincipalUrl(), $principals);
 
@@ -171,7 +172,7 @@ class ProxyRead implements IProxyRead {
      *
      * @return string
      */
-    public function getDisplayName() {
+    function getDisplayName() {
 
         return $this->getName();
 
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/ProxyWrite.php b/vendor/sabre/dav/lib/CalDAV/Principal/ProxyWrite.php
index 02cd81f70..8124c05e0 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/ProxyWrite.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/ProxyWrite.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Sabre\CalDAV\Principal;
+
 use Sabre\DAVACL;
 use Sabre\DAV;
 
@@ -11,7 +12,7 @@ use Sabre\DAV;
  * This is needed to implement 'Calendar delegation' support. This class is
  * instantiated by User.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -39,7 +40,7 @@ class ProxyWrite implements IProxyWrite {
      * @param DAVACL\PrincipalBackend\BackendInterface $principalBackend
      * @param array $principalInfo
      */
-    public function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, array $principalInfo) {
+    function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, array $principalInfo) {
 
         $this->principalInfo = $principalInfo;
         $this->principalBackend = $principalBackend;
@@ -51,7 +52,7 @@ class ProxyWrite implements IProxyWrite {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return 'calendar-proxy-write';
 
@@ -62,7 +63,7 @@ class ProxyWrite implements IProxyWrite {
      *
      * @return null
      */
-    public function getLastModified() {
+    function getLastModified() {
 
         return null;
 
@@ -74,7 +75,7 @@ class ProxyWrite implements IProxyWrite {
      * @throws DAV\Exception\Forbidden
      * @return void
      */
-    public function delete() {
+    function delete() {
 
         throw new DAV\Exception\Forbidden('Permission denied to delete node');
 
@@ -87,7 +88,7 @@ class ProxyWrite implements IProxyWrite {
      * @param string $name The new name
      * @return void
      */
-    public function setName($name) {
+    function setName($name) {
 
         throw new DAV\Exception\Forbidden('Permission denied to rename file');
 
@@ -101,9 +102,9 @@ class ProxyWrite implements IProxyWrite {
      *
      * @return array
      */
-    public function getAlternateUriSet() {
+    function getAlternateUriSet() {
 
-        return array();
+        return [];
 
     }
 
@@ -112,7 +113,7 @@ class ProxyWrite implements IProxyWrite {
      *
      * @return string
      */
-    public function getPrincipalUrl() {
+    function getPrincipalUrl() {
 
         return $this->principalInfo['uri'] . '/' . $this->getName();
 
@@ -126,7 +127,7 @@ class ProxyWrite implements IProxyWrite {
      *
      * @return array
      */
-    public function getGroupMemberSet() {
+    function getGroupMemberSet() {
 
         return $this->principalBackend->getGroupMemberSet($this->getPrincipalUrl());
 
@@ -140,7 +141,7 @@ class ProxyWrite implements IProxyWrite {
      *
      * @return array
      */
-    public function getGroupMembership() {
+    function getGroupMembership() {
 
         return $this->principalBackend->getGroupMembership($this->getPrincipalUrl());
 
@@ -157,7 +158,7 @@ class ProxyWrite implements IProxyWrite {
      * @param array $principals
      * @return void
      */
-    public function setGroupMemberSet(array $principals) {
+    function setGroupMemberSet(array $principals) {
 
         $this->principalBackend->setGroupMemberSet($this->getPrincipalUrl(), $principals);
 
@@ -171,7 +172,7 @@ class ProxyWrite implements IProxyWrite {
      *
      * @return string
      */
-    public function getDisplayName() {
+    function getDisplayName() {
 
         return $this->getName();
 
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/User.php b/vendor/sabre/dav/lib/CalDAV/Principal/User.php
index 6f3ccb868..6e97e7cca 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Principal/User.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/User.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Sabre\CalDAV\Principal;
+
 use Sabre\DAV;
 use Sabre\DAVACL;
 
@@ -11,7 +12,7 @@ use Sabre\DAVACL;
  * collection and returns the caldav-proxy-read and caldav-proxy-write child
  * principals.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -25,7 +26,7 @@ class User extends DAVACL\Principal implements DAV\ICollection {
      * @throws DAV\Exception\Forbidden
      * @return void
      */
-    public function createFile($name, $data = null) {
+    function createFile($name, $data = null) {
 
         throw new DAV\Exception\Forbidden('Permission denied to create file (filename ' . $name . ')');
 
@@ -38,7 +39,7 @@ class User extends DAVACL\Principal implements DAV\ICollection {
      * @throws DAV\Exception\Forbidden
      * @return void
      */
-    public function createDirectory($name) {
+    function createDirectory($name) {
 
         throw new DAV\Exception\Forbidden('Permission denied to create directory');
 
@@ -50,7 +51,7 @@ class User extends DAVACL\Principal implements DAV\ICollection {
      * @param string $name
      * @return DAV\INode
      */
-    public function getChild($name) {
+    function getChild($name) {
 
         $principal = $this->principalBackend->getPrincipalByPath($this->getPrincipalURL() . '/' . $name);
         if (!$principal) {
@@ -69,11 +70,11 @@ class User extends DAVACL\Principal implements DAV\ICollection {
     /**
      * Returns an array with all the child nodes
      *
-    * @return DAV\INode[]
+     * @return DAV\INode[]
      */
-    public function getChildren() {
+    function getChildren() {
 
-        $r = array();
+        $r = [];
         if ($this->principalBackend->getPrincipalByPath($this->getPrincipalURL() . '/calendar-proxy-read')) {
             $r[] = new ProxyRead($this->principalBackend, $this->principalProperties);
         }
@@ -91,7 +92,7 @@ class User extends DAVACL\Principal implements DAV\ICollection {
      * @param string $name
      * @return bool
      */
-    public function childExists($name) {
+    function childExists($name) {
 
         try {
             $this->getChild($name);
@@ -114,19 +115,19 @@ class User extends DAVACL\Principal implements DAV\ICollection {
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
 
         $acl = parent::getACL();
-        $acl[] = array(
+        $acl[] = [
             'privilege' => '{DAV:}read',
             'principal' => $this->principalProperties['uri'] . '/calendar-proxy-read',
             'protected' => true,
-        );
-        $acl[] = array(
+        ];
+        $acl[] = [
             'privilege' => '{DAV:}read',
             'principal' => $this->principalProperties['uri'] . '/calendar-proxy-write',
             'protected' => true,
-        );
+        ];
         return $acl;
 
     }
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/IInbox.php b/vendor/sabre/dav/lib/CalDAV/Schedule/IInbox.php
new file mode 100644
index 000000000..c9fd77d93
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/IInbox.php
@@ -0,0 +1,15 @@
+<?php
+
+namespace Sabre\CalDAV\Schedule;
+
+/**
+ * Implement this interface to have a node be recognized as a CalDAV scheduling
+ * inbox.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface IInbox extends \Sabre\CalDAV\ICalendarObjectContainer, \Sabre\DAVACL\IACL {
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/IMipPlugin.php b/vendor/sabre/dav/lib/CalDAV/Schedule/IMipPlugin.php
new file mode 100644
index 000000000..ffb1fe45b
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/IMipPlugin.php
@@ -0,0 +1,190 @@
+<?php
+
+namespace Sabre\CalDAV\Schedule;
+
+use Sabre\DAV;
+use Sabre\VObject\ITip;
+
+/**
+ * iMIP handler.
+ *
+ * This class is responsible for sending out iMIP messages. iMIP is the
+ * email-based transport for iTIP. iTIP deals with scheduling operations for
+ * iCalendar objects.
+ *
+ * If you want to customize the email that gets sent out, you can do so by
+ * extending this class and overriding the sendMessage method.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class IMipPlugin extends DAV\ServerPlugin {
+
+    /**
+     * Email address used in From: header.
+     *
+     * @var string
+     */
+    protected $senderEmail;
+
+    /**
+     * ITipMessage
+     *
+     * @var ITip\Message
+     */
+    protected $itipMessage;
+
+    /**
+     * Creates the email handler.
+     *
+     * @param string $senderEmail. The 'senderEmail' is the email that shows up
+     *                             in the 'From:' address. This should
+     *                             generally be some kind of no-reply email
+     *                             address you own.
+     */
+    function __construct($senderEmail) {
+
+        $this->senderEmail = $senderEmail;
+
+    }
+
+    /*
+     * This initializes the plugin.
+     *
+     * This function is called by Sabre\DAV\Server, after
+     * addPlugin is called.
+     *
+     * This method should set up the required event subscriptions.
+     *
+     * @param DAV\Server $server
+     * @return void
+     */
+    function initialize(DAV\Server $server) {
+
+        $server->on('schedule', [$this, 'schedule'], 120);
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using \Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'imip';
+
+    }
+
+    /**
+     * Event handler for the 'schedule' event.
+     *
+     * @param ITip\Message $iTipMessage
+     * @return void
+     */
+    function schedule(ITip\Message $iTipMessage) {
+
+        // Not sending any emails if the system considers the update
+        // insignificant.
+        if (!$iTipMessage->significantChange) {
+            if (!$iTipMessage->scheduleStatus) {
+                $iTipMessage->scheduleStatus = '1.0;We got the message, but it\'s not significant enough to warrant an email';
+            }
+            return;
+        }
+
+        $summary = $iTipMessage->message->VEVENT->SUMMARY;
+
+        if (parse_url($iTipMessage->sender, PHP_URL_SCHEME) !== 'mailto')
+            return;
+
+        if (parse_url($iTipMessage->recipient, PHP_URL_SCHEME) !== 'mailto')
+            return;
+
+        $sender = substr($iTipMessage->sender, 7);
+        $recipient = substr($iTipMessage->recipient, 7);
+
+        if ($iTipMessage->senderName) {
+            $sender = $iTipMessage->senderName . ' <' . $sender . '>';
+        }
+        if ($iTipMessage->recipientName) {
+            $recipient = $iTipMessage->recipientName . ' <' . $recipient . '>';
+        }
+
+        $subject = 'SabreDAV iTIP message';
+        switch (strtoupper($iTipMessage->method)) {
+            case 'REPLY' :
+                $subject = 'Re: ' . $summary;
+                break;
+            case 'REQUEST' :
+                $subject = $summary;
+                break;
+            case 'CANCEL' :
+                $subject = 'Cancelled: ' . $summary;
+                break;
+        }
+
+        $headers = [
+            'Reply-To: ' . $sender,
+            'From: ' . $this->senderEmail,
+            'Content-Type: text/calendar; charset=UTF-8; method=' . $iTipMessage->method,
+        ];
+        if (DAV\Server::$exposeVersion) {
+            $headers[] = 'X-Sabre-Version: ' . DAV\Version::VERSION;
+        }
+        $this->mail(
+            $recipient,
+            $subject,
+            $iTipMessage->message->serialize(),
+            $headers
+        );
+        $iTipMessage->scheduleStatus = '1.1; Scheduling message is sent via iMip';
+
+    }
+
+    // @codeCoverageIgnoreStart
+    // This is deemed untestable in a reasonable manner
+
+    /**
+     * This function is responsible for sending the actual email.
+     *
+     * @param string $to Recipient email address
+     * @param string $subject Subject of the email
+     * @param string $body iCalendar body
+     * @param array $headers List of headers
+     * @return void
+     */
+    protected function mail($to, $subject, $body, array $headers) {
+
+        mail($to, $subject, $body, implode("\r\n", $headers));
+
+    }
+
+    // @codeCoverageIgnoreEnd
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Email delivery (rfc6037) for CalDAV scheduling',
+            'link'        => 'http://sabre.io/dav/scheduling/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Schedule/IOutbox.php b/vendor/sabre/dav/lib/CalDAV/Schedule/IOutbox.php
index 7341eaa85..88fbdc411 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Schedule/IOutbox.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/IOutbox.php
@@ -6,11 +6,10 @@ namespace Sabre\CalDAV\Schedule;
  * Implement this interface to have a node be recognized as a CalDAV scheduling
  * outbox.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 interface IOutbox extends \Sabre\DAV\ICollection, \Sabre\DAVACL\IACL {
 
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/ISchedulingObject.php b/vendor/sabre/dav/lib/CalDAV/Schedule/ISchedulingObject.php
new file mode 100644
index 000000000..b37cb40a1
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/ISchedulingObject.php
@@ -0,0 +1,13 @@
+<?php
+
+namespace Sabre\CalDAV\Schedule;
+
+/**
+ * The SchedulingObject represents a scheduling object in the Inbox collection
+ *
+ * @license http://sabre.io/license/ Modified BSD License
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ */
+interface ISchedulingObject extends \Sabre\CalDAV\ICalendarObject {
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/Inbox.php b/vendor/sabre/dav/lib/CalDAV/Schedule/Inbox.php
new file mode 100644
index 000000000..13212565e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/Inbox.php
@@ -0,0 +1,261 @@
+<?php
+
+namespace Sabre\CalDAV\Schedule;
+
+use Sabre\DAV;
+use Sabre\CalDAV;
+use Sabre\DAVACL;
+use Sabre\CalDAV\Backend;
+use Sabre\VObject;
+
+/**
+ * The CalDAV scheduling inbox
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Inbox extends DAV\Collection implements IInbox {
+
+    /**
+     * CalDAV backend
+     *
+     * @var Backend\BackendInterface
+     */
+    protected $caldavBackend;
+
+    /**
+     * The principal Uri
+     *
+     * @var string
+     */
+    protected $principalUri;
+
+    /**
+     * Constructor
+     *
+     * @param Backend\SchedulingSupport $caldavBackend
+     * @param string $principalUri
+     */
+    function __construct(Backend\SchedulingSupport $caldavBackend, $principalUri) {
+
+        $this->caldavBackend = $caldavBackend;
+        $this->principalUri = $principalUri;
+
+    }
+
+    /**
+     * Returns the name of the node.
+     *
+     * This is used to generate the url.
+     *
+     * @return string
+     */
+    function getName() {
+
+        return 'inbox';
+
+    }
+
+    /**
+     * Returns an array with all the child nodes
+     *
+     * @return \Sabre\DAV\INode[]
+     */
+    function getChildren() {
+
+        $objs = $this->caldavBackend->getSchedulingObjects($this->principalUri);
+        $children = [];
+        foreach ($objs as $obj) {
+            //$obj['acl'] = $this->getACL();
+            $obj['principaluri'] = $this->principalUri;
+            $children[] = new SchedulingObject($this->caldavBackend, $obj);
+        }
+        return $children;
+
+    }
+
+    /**
+     * Creates a new file in the directory
+     *
+     * Data will either be supplied as a stream resource, or in certain cases
+     * as a string. Keep in mind that you may have to support either.
+     *
+     * After succesful creation of the file, you may choose to return the ETag
+     * of the new file here.
+     *
+     * The returned ETag must be surrounded by double-quotes (The quotes should
+     * be part of the actual string).
+     *
+     * If you cannot accurately determine the ETag, you should not return it.
+     * If you don't store the file exactly as-is (you're transforming it
+     * somehow) you should also not return an ETag.
+     *
+     * This means that if a subsequent GET to this new file does not exactly
+     * return the same contents of what was submitted here, you are strongly
+     * recommended to omit the ETag.
+     *
+     * @param string $name Name of the file
+     * @param resource|string $data Initial payload
+     * @return null|string
+     */
+    function createFile($name, $data = null) {
+
+        $this->caldavBackend->createSchedulingObject($this->principalUri, $name, $data);
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getOwner() {
+
+        return $this->principalUri;
+
+    }
+
+    /**
+     * Returns a group principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getGroup() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    function getACL() {
+
+        return [
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => '{DAV:}authenticated',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}write-properties',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}unbind',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}unbind',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-deliver-invite',
+                'principal' => '{DAV:}authenticated',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-deliver-reply',
+                'principal' => '{DAV:}authenticated',
+                'protected' => true,
+            ],
+        ];
+
+    }
+
+    /**
+     * Updates the ACL
+     *
+     * This method will receive a list of new ACE's.
+     *
+     * @param array $acl
+     * @return void
+     */
+    function setACL(array $acl) {
+
+        throw new DAV\Exception\MethodNotAllowed('You\'re not allowed to update the ACL');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    function getSupportedPrivilegeSet() {
+
+        $ns = '{' . CalDAV\Plugin::NS_CALDAV . '}';
+
+        $default = DAVACL\Plugin::getDefaultSupportedPrivilegeSet();
+        $default['aggregates'][] = [
+            'privilege'  => $ns . 'schedule-deliver',
+            'aggregates' => [
+               ['privilege' => $ns . 'schedule-deliver-invite'],
+               ['privilege' => $ns . 'schedule-deliver-reply'],
+            ],
+        ];
+        return $default;
+
+    }
+
+    /**
+     * Performs a calendar-query on the contents of this calendar.
+     *
+     * The calendar-query is defined in RFC4791 : CalDAV. Using the
+     * calendar-query it is possible for a client to request a specific set of
+     * object, based on contents of iCalendar properties, date-ranges and
+     * iCalendar component types (VTODO, VEVENT).
+     *
+     * This method should just return a list of (relative) urls that match this
+     * query.
+     *
+     * The list of filters are specified as an array. The exact array is
+     * documented by \Sabre\CalDAV\CalendarQueryParser.
+     *
+     * @param array $filters
+     * @return array
+     */
+    function calendarQuery(array $filters) {
+
+        $result = [];
+        $validator = new CalDAV\CalendarQueryValidator();
+
+        $objects = $this->caldavBackend->getSchedulingObjects($this->principalUri);
+        foreach ($objects as $object) {
+            $vObject = VObject\Reader::read($object['calendardata']);
+            if ($validator->validate($vObject, $filters)) {
+                $result[] = $object['uri'];
+            }
+
+            // Destroy circular references to PHP will GC the object.
+            $vObject->destroy();
+        }
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Schedule/Outbox.php b/vendor/sabre/dav/lib/CalDAV/Schedule/Outbox.php
index cf4500f69..dabaee2ca 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Schedule/Outbox.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/Outbox.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Sabre\CalDAV\Schedule;
+
 use Sabre\DAV;
 use Sabre\CalDAV;
 use Sabre\DAVACL;
@@ -12,7 +13,7 @@ use Sabre\DAVACL;
  * free-busy requests. This functionality is completely handled by the
  * Scheduling plugin, so this object is actually mostly static.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -30,7 +31,7 @@ class Outbox extends DAV\Collection implements IOutbox {
      *
      * @param string $principalUri
      */
-    public function __construct($principalUri) {
+    function __construct($principalUri) {
 
         $this->principalUri = $principalUri;
 
@@ -43,7 +44,7 @@ class Outbox extends DAV\Collection implements IOutbox {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return 'outbox';
 
@@ -54,9 +55,9 @@ class Outbox extends DAV\Collection implements IOutbox {
      *
      * @return \Sabre\DAV\INode[]
      */
-    public function getChildren() {
+    function getChildren() {
 
-        return array();
+        return [];
 
     }
 
@@ -67,7 +68,7 @@ class Outbox extends DAV\Collection implements IOutbox {
      *
      * @return string|null
      */
-    public function getOwner() {
+    function getOwner() {
 
         return $this->principalUri;
 
@@ -80,7 +81,7 @@ class Outbox extends DAV\Collection implements IOutbox {
      *
      * @return string|null
      */
-    public function getGroup() {
+    function getGroup() {
 
         return null;
 
@@ -98,25 +99,45 @@ class Outbox extends DAV\Collection implements IOutbox {
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
 
-        return array(
-            array(
+        return [
+            [
                 'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-query-freebusy',
                 'principal' => $this->getOwner(),
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-post-vevent',
                 'principal' => $this->getOwner(),
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}read',
                 'principal' => $this->getOwner(),
                 'protected' => true,
-            ),
-        );
+            ],
+            [
+                'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-query-freebusy',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-post-vevent',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner() . '/calendar-proxy-read',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+        ];
 
     }
 
@@ -128,7 +149,7 @@ class Outbox extends DAV\Collection implements IOutbox {
      * @param array $acl
      * @return void
      */
-    public function setACL(array $acl) {
+    function setACL(array $acl) {
 
         throw new DAV\Exception\MethodNotAllowed('You\'re not allowed to update the ACL');
 
@@ -146,15 +167,15 @@ class Outbox extends DAV\Collection implements IOutbox {
      *
      * @return array|null
      */
-    public function getSupportedPrivilegeSet() {
+    function getSupportedPrivilegeSet() {
 
         $default = DAVACL\Plugin::getDefaultSupportedPrivilegeSet();
-        $default['aggregates'][] = array(
+        $default['aggregates'][] = [
             'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-query-freebusy',
-        );
-        $default['aggregates'][] = array(
+        ];
+        $default['aggregates'][] = [
             'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-post-vevent',
-        );
+        ];
 
         return $default;
 
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php b/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php
new file mode 100644
index 000000000..827d6209b
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php
@@ -0,0 +1,994 @@
+<?php
+
+namespace Sabre\CalDAV\Schedule;
+
+use DateTimeZone;
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+use Sabre\DAV\PropFind;
+use Sabre\DAV\PropPatch;
+use Sabre\DAV\INode;
+use Sabre\DAV\Xml\Property\Href;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Sabre\VObject;
+use Sabre\VObject\Reader;
+use Sabre\VObject\Component\VCalendar;
+use Sabre\VObject\ITip;
+use Sabre\VObject\ITip\Message;
+use Sabre\DAVACL;
+use Sabre\CalDAV\ICalendar;
+use Sabre\CalDAV\ICalendarObject;
+use Sabre\CalDAV\Xml\Property\ScheduleCalendarTransp;
+use Sabre\DAV\Exception\NotFound;
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\DAV\Exception\NotImplemented;
+
+/**
+ * CalDAV scheduling plugin.
+ * =========================
+ *
+ * This plugin provides the functionality added by the "Scheduling Extensions
+ * to CalDAV" standard, as defined in RFC6638.
+ *
+ * calendar-auto-schedule largely works by intercepting a users request to
+ * update their local calendar. If a user creates a new event with attendees,
+ * this plugin is supposed to grab the information from that event, and notify
+ * the attendees of this.
+ *
+ * There's 3 possible transports for this:
+ * * local delivery
+ * * delivery through email (iMip)
+ * * server-to-server delivery (iSchedule)
+ *
+ * iMip is simply, because we just need to add the iTip message as an email
+ * attachment. Local delivery is harder, because we both need to add this same
+ * message to a local DAV inbox, as well as live-update the relevant events.
+ *
+ * iSchedule is something for later.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends ServerPlugin {
+
+    /**
+     * This is the official CalDAV namespace
+     */
+    const NS_CALDAV = 'urn:ietf:params:xml:ns:caldav';
+
+    /**
+     * Reference to main Server object.
+     *
+     * @var Server
+     */
+    protected $server;
+
+    /**
+     * Returns a list of features for the DAV: HTTP header.
+     *
+     * @return array
+     */
+    function getFeatures() {
+
+        return ['calendar-auto-schedule', 'calendar-availability'];
+
+    }
+
+    /**
+     * Returns the name of the plugin.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'caldav-schedule';
+
+    }
+
+    /**
+     * Initializes the plugin
+     *
+     * @param Server $server
+     * @return void
+     */
+    function initialize(Server $server) {
+
+        $this->server = $server;
+        $server->on('method:POST',          [$this, 'httpPost']);
+        $server->on('propFind',             [$this, 'propFind']);
+        $server->on('propPatch',            [$this, 'propPatch']);
+        $server->on('calendarObjectChange', [$this, 'calendarObjectChange']);
+        $server->on('beforeUnbind',         [$this, 'beforeUnbind']);
+        $server->on('schedule',             [$this, 'scheduleLocalDelivery']);
+
+        $ns = '{' . self::NS_CALDAV . '}';
+
+        /**
+         * This information ensures that the {DAV:}resourcetype property has
+         * the correct values.
+         */
+        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Schedule\\IOutbox'] = $ns . 'schedule-outbox';
+        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Schedule\\IInbox'] = $ns . 'schedule-inbox';
+
+        /**
+         * Properties we protect are made read-only by the server.
+         */
+        array_push($server->protectedProperties,
+            $ns . 'schedule-inbox-URL',
+            $ns . 'schedule-outbox-URL',
+            $ns . 'calendar-user-address-set',
+            $ns . 'calendar-user-type',
+            $ns . 'schedule-default-calendar-URL'
+        );
+
+    }
+
+    /**
+     * Use this method to tell the server this plugin defines additional
+     * HTTP methods.
+     *
+     * This method is passed a uri. It should only return HTTP methods that are
+     * available for the specified uri.
+     *
+     * @param string $uri
+     * @return array
+     */
+    function getHTTPMethods($uri) {
+
+        try {
+            $node = $this->server->tree->getNodeForPath($uri);
+        } catch (NotFound $e) {
+            return [];
+        }
+
+        if ($node instanceof IOutbox) {
+            return ['POST'];
+        }
+
+        return [];
+
+    }
+
+    /**
+     * This method handles POST request for the outbox.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpPost(RequestInterface $request, ResponseInterface $response) {
+
+        // Checking if this is a text/calendar content type
+        $contentType = $request->getHeader('Content-Type');
+        if (strpos($contentType, 'text/calendar') !== 0) {
+            return;
+        }
+
+        $path = $request->getPath();
+
+        // Checking if we're talking to an outbox
+        try {
+            $node = $this->server->tree->getNodeForPath($path);
+        } catch (NotFound $e) {
+            return;
+        }
+        if (!$node instanceof IOutbox)
+            return;
+
+        $this->server->transactionType = 'post-caldav-outbox';
+        $this->outboxRequest($node, $request, $response);
+
+        // Returning false breaks the event chain and tells the server we've
+        // handled the request.
+        return false;
+
+    }
+
+    /**
+     * This method handler is invoked during fetching of properties.
+     *
+     * We use this event to add calendar-auto-schedule-specific properties.
+     *
+     * @param PropFind $propFind
+     * @param INode $node
+     * @return void
+     */
+    function propFind(PropFind $propFind, INode $node) {
+
+        if ($node instanceof DAVACL\IPrincipal) {
+
+            $caldavPlugin = $this->server->getPlugin('caldav');
+            $principalUrl = $node->getPrincipalUrl();
+
+            // schedule-outbox-URL property
+            $propFind->handle('{' . self::NS_CALDAV . '}schedule-outbox-URL', function() use ($principalUrl, $caldavPlugin) {
+
+                $calendarHomePath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl);
+                if (!$calendarHomePath) {
+                    return null;
+                }
+                $outboxPath = $calendarHomePath . '/outbox/';
+
+                return new Href($outboxPath);
+
+            });
+            // schedule-inbox-URL property
+            $propFind->handle('{' . self::NS_CALDAV . '}schedule-inbox-URL', function() use ($principalUrl, $caldavPlugin) {
+
+                $calendarHomePath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl);
+                if (!$calendarHomePath) {
+                    return null;
+                }
+                $inboxPath = $calendarHomePath . '/inbox/';
+
+                return new Href($inboxPath);
+
+            });
+
+            $propFind->handle('{' . self::NS_CALDAV . '}schedule-default-calendar-URL', function() use ($principalUrl, $caldavPlugin) {
+
+                // We don't support customizing this property yet, so in the
+                // meantime we just grab the first calendar in the home-set.
+                $calendarHomePath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl);
+
+                if (!$calendarHomePath) {
+                    return null;
+                }
+
+                $sccs = '{' . self::NS_CALDAV . '}supported-calendar-component-set';
+
+                $result = $this->server->getPropertiesForPath($calendarHomePath, [
+                    '{DAV:}resourcetype',
+                    $sccs,
+                ], 1);
+
+                foreach ($result as $child) {
+                    if (!isset($child[200]['{DAV:}resourcetype']) || !$child[200]['{DAV:}resourcetype']->is('{' . self::NS_CALDAV . '}calendar') || $child[200]['{DAV:}resourcetype']->is('{http://calendarserver.org/ns/}shared')) {
+                        // Node is either not a calendar or a shared instance.
+                        continue;
+                    }
+                    if (!isset($child[200][$sccs]) || in_array('VEVENT', $child[200][$sccs]->getValue())) {
+                        // Either there is no supported-calendar-component-set
+                        // (which is fine) or we found one that supports VEVENT.
+                        return new Href($child['href']);
+                    }
+                }
+
+            });
+
+            // The server currently reports every principal to be of type
+            // 'INDIVIDUAL'
+            $propFind->handle('{' . self::NS_CALDAV . '}calendar-user-type', function() {
+
+                return 'INDIVIDUAL';
+
+            });
+
+        }
+
+        // Mapping the old property to the new property.
+        $propFind->handle('{http://calendarserver.org/ns/}calendar-availability', function() use ($propFind, $node) {
+
+             // In case it wasn't clear, the only difference is that we map the
+            // old property to a different namespace.
+             $availProp = '{' . self::NS_CALDAV . '}calendar-availability';
+             $subPropFind = new PropFind(
+                 $propFind->getPath(),
+                 [$availProp]
+             );
+
+             $this->server->getPropertiesByNode(
+                 $subPropFind,
+                 $node
+             );
+
+             $propFind->set(
+                 '{http://calendarserver.org/ns/}calendar-availability',
+                 $subPropFind->get($availProp),
+                 $subPropFind->getStatus($availProp)
+             );
+
+        });
+
+    }
+
+    /**
+     * This method is called during property updates.
+     *
+     * @param string $path
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    function propPatch($path, PropPatch $propPatch) {
+
+        // Mapping the old property to the new property.
+        $propPatch->handle('{http://calendarserver.org/ns/}calendar-availability', function($value) use ($path) {
+
+            $availProp = '{' . self::NS_CALDAV . '}calendar-availability';
+            $subPropPatch = new PropPatch([$availProp => $value]);
+            $this->server->emit('propPatch', [$path, $subPropPatch]);
+            $subPropPatch->commit();
+
+            return $subPropPatch->getResult()[$availProp];
+
+        });
+
+    }
+
+    /**
+     * This method is triggered whenever there was a calendar object gets
+     * created or updated.
+     *
+     * @param RequestInterface $request HTTP request
+     * @param ResponseInterface $response HTTP Response
+     * @param VCalendar $vCal Parsed iCalendar object
+     * @param mixed $calendarPath Path to calendar collection
+     * @param mixed $modified The iCalendar object has been touched.
+     * @param mixed $isNew Whether this was a new item or we're updating one
+     * @return void
+     */
+    function calendarObjectChange(RequestInterface $request, ResponseInterface $response, VCalendar $vCal, $calendarPath, &$modified, $isNew) {
+
+        if (!$this->scheduleReply($this->server->httpRequest)) {
+            return;
+        }
+
+        $calendarNode = $this->server->tree->getNodeForPath($calendarPath);
+
+        $addresses = $this->getAddressesForPrincipal(
+            $calendarNode->getOwner()
+        );
+
+        if (!$isNew) {
+            $node = $this->server->tree->getNodeForPath($request->getPath());
+            $oldObj = Reader::read($node->get());
+        } else {
+            $oldObj = null;
+        }
+
+        $this->processICalendarChange($oldObj, $vCal, $addresses, [], $modified);
+
+        if ($oldObj) {
+            // Destroy circular references so PHP will GC the object.
+            $oldObj->destroy();
+        }
+
+    }
+
+    /**
+     * This method is responsible for delivering the ITip message.
+     *
+     * @param ITip\Message $itipMessage
+     * @return void
+     */
+    function deliver(ITip\Message $iTipMessage) {
+
+        $this->server->emit('schedule', [$iTipMessage]);
+        if (!$iTipMessage->scheduleStatus) {
+            $iTipMessage->scheduleStatus = '5.2;There was no system capable of delivering the scheduling message';
+        }
+        // In case the change was considered 'insignificant', we are going to
+        // remove any error statuses, if any. See ticket #525.
+        list($baseCode) = explode('.', $iTipMessage->scheduleStatus);
+        if (!$iTipMessage->significantChange && in_array($baseCode, ['3', '5'])) {
+            $iTipMessage->scheduleStatus = null;
+        }
+
+    }
+
+    /**
+     * This method is triggered before a file gets deleted.
+     *
+     * We use this event to make sure that when this happens, attendees get
+     * cancellations, and organizers get 'DECLINED' statuses.
+     *
+     * @param string $path
+     * @return void
+     */
+    function beforeUnbind($path) {
+
+        // FIXME: We shouldn't trigger this functionality when we're issuing a
+        // MOVE. This is a hack.
+        if ($this->server->httpRequest->getMethod() === 'MOVE') return;
+
+        $node = $this->server->tree->getNodeForPath($path);
+
+        if (!$node instanceof ICalendarObject || $node instanceof ISchedulingObject) {
+            return;
+        }
+
+        if (!$this->scheduleReply($this->server->httpRequest)) {
+            return;
+        }
+
+        $addresses = $this->getAddressesForPrincipal(
+            $node->getOwner()
+        );
+
+        $broker = new ITip\Broker();
+        $messages = $broker->parseEvent(null, $addresses, $node->get());
+
+        foreach ($messages as $message) {
+            $this->deliver($message);
+        }
+
+    }
+
+    /**
+     * Event handler for the 'schedule' event.
+     *
+     * This handler attempts to look at local accounts to deliver the
+     * scheduling object.
+     *
+     * @param ITip\Message $iTipMessage
+     * @return void
+     */
+    function scheduleLocalDelivery(ITip\Message $iTipMessage) {
+
+        $aclPlugin = $this->server->getPlugin('acl');
+
+        // Local delivery is not available if the ACL plugin is not loaded.
+        if (!$aclPlugin) {
+            return;
+        }
+
+        $caldavNS = '{' . self::NS_CALDAV . '}';
+
+        $principalUri = $aclPlugin->getPrincipalByUri($iTipMessage->recipient);
+        if (!$principalUri) {
+            $iTipMessage->scheduleStatus = '3.7;Could not find principal.';
+            return;
+        }
+
+        // We found a principal URL, now we need to find its inbox.
+        // Unfortunately we may not have sufficient privileges to find this, so
+        // we are temporarily turning off ACL to let this come through.
+        //
+        // Once we support PHP 5.5, this should be wrapped in a try..finally
+        // block so we can ensure that this privilege gets added again after.
+        $this->server->removeListener('propFind', [$aclPlugin, 'propFind']);
+
+        $result = $this->server->getProperties(
+            $principalUri,
+            [
+                '{DAV:}principal-URL',
+                 $caldavNS . 'calendar-home-set',
+                 $caldavNS . 'schedule-inbox-URL',
+                 $caldavNS . 'schedule-default-calendar-URL',
+                '{http://sabredav.org/ns}email-address',
+            ]
+        );
+
+        // Re-registering the ACL event
+        $this->server->on('propFind', [$aclPlugin, 'propFind'], 20);
+
+        if (!isset($result[$caldavNS . 'schedule-inbox-URL'])) {
+            $iTipMessage->scheduleStatus = '5.2;Could not find local inbox';
+            return;
+        }
+        if (!isset($result[$caldavNS . 'calendar-home-set'])) {
+            $iTipMessage->scheduleStatus = '5.2;Could not locate a calendar-home-set';
+            return;
+        }
+        if (!isset($result[$caldavNS . 'schedule-default-calendar-URL'])) {
+            $iTipMessage->scheduleStatus = '5.2;Could not find a schedule-default-calendar-URL property';
+            return;
+        }
+
+        $calendarPath = $result[$caldavNS . 'schedule-default-calendar-URL']->getHref();
+        $homePath = $result[$caldavNS . 'calendar-home-set']->getHref();
+        $inboxPath = $result[$caldavNS . 'schedule-inbox-URL']->getHref();
+
+        if ($iTipMessage->method === 'REPLY') {
+            $privilege = 'schedule-deliver-reply';
+        } else {
+            $privilege = 'schedule-deliver-invite';
+        }
+
+        if (!$aclPlugin->checkPrivileges($inboxPath, $caldavNS . $privilege, DAVACL\Plugin::R_PARENT, false)) {
+            $iTipMessage->scheduleStatus = '3.8;organizer did not have the ' . $privilege . ' privilege on the attendees inbox';
+            return;
+        }
+
+        // Next, we're going to find out if the item already exits in one of
+        // the users' calendars.
+        $uid = $iTipMessage->uid;
+
+        $newFileName = 'sabredav-' . \Sabre\DAV\UUIDUtil::getUUID() . '.ics';
+
+        $home = $this->server->tree->getNodeForPath($homePath);
+        $inbox = $this->server->tree->getNodeForPath($inboxPath);
+
+        $currentObject = null;
+        $objectNode = null;
+        $isNewNode = false;
+
+        $result = $home->getCalendarObjectByUID($uid);
+        if ($result) {
+            // There was an existing object, we need to update probably.
+            $objectPath = $homePath . '/' . $result;
+            $objectNode = $this->server->tree->getNodeForPath($objectPath);
+            $oldICalendarData = $objectNode->get();
+            $currentObject = Reader::read($oldICalendarData);
+        } else {
+            $isNewNode = true;
+        }
+
+        $broker = new ITip\Broker();
+        $newObject = $broker->processMessage($iTipMessage, $currentObject);
+
+        $inbox->createFile($newFileName, $iTipMessage->message->serialize());
+
+        if (!$newObject) {
+            // We received an iTip message referring to a UID that we don't
+            // have in any calendars yet, and processMessage did not give us a
+            // calendarobject back.
+            //
+            // The implication is that processMessage did not understand the
+            // iTip message.
+            $iTipMessage->scheduleStatus = '5.0;iTip message was not processed by the server, likely because we didn\'t understand it.';
+            return;
+        }
+
+        // Note that we are bypassing ACL on purpose by calling this directly.
+        // We may need to look a bit deeper into this later. Supporting ACL
+        // here would be nice.
+        if ($isNewNode) {
+            $calendar = $this->server->tree->getNodeForPath($calendarPath);
+            $calendar->createFile($newFileName, $newObject->serialize());
+        } else {
+            // If the message was a reply, we may have to inform other
+            // attendees of this attendees status. Therefore we're shooting off
+            // another itipMessage.
+            if ($iTipMessage->method === 'REPLY') {
+                $this->processICalendarChange(
+                    $oldICalendarData,
+                    $newObject,
+                    [$iTipMessage->recipient],
+                    [$iTipMessage->sender]
+                );
+            }
+            $objectNode->put($newObject->serialize());
+        }
+        $iTipMessage->scheduleStatus = '1.2;Message delivered locally';
+
+    }
+
+    /**
+     * This method looks at an old iCalendar object, a new iCalendar object and
+     * starts sending scheduling messages based on the changes.
+     *
+     * A list of addresses needs to be specified, so the system knows who made
+     * the update, because the behavior may be different based on if it's an
+     * attendee or an organizer.
+     *
+     * This method may update $newObject to add any status changes.
+     *
+     * @param VCalendar|string $oldObject
+     * @param VCalendar $newObject
+     * @param array $addresses
+     * @param array $ignore Any addresses to not send messages to.
+     * @param bool $modified A marker to indicate that the original object
+     *   modified by this process.
+     * @return void
+     */
+    protected function processICalendarChange($oldObject = null, VCalendar $newObject, array $addresses, array $ignore = [], &$modified = false) {
+
+        $broker = new ITip\Broker();
+        $messages = $broker->parseEvent($newObject, $addresses, $oldObject);
+
+        if ($messages) $modified = true;
+
+        foreach ($messages as $message) {
+
+            if (in_array($message->recipient, $ignore)) {
+                continue;
+            }
+
+            $this->deliver($message);
+
+            if (isset($newObject->VEVENT->ORGANIZER) && ($newObject->VEVENT->ORGANIZER->getNormalizedValue() === $message->recipient)) {
+                if ($message->scheduleStatus) {
+                    $newObject->VEVENT->ORGANIZER['SCHEDULE-STATUS'] = $message->getScheduleStatus();
+                }
+                unset($newObject->VEVENT->ORGANIZER['SCHEDULE-FORCE-SEND']);
+
+            } else {
+
+                if (isset($newObject->VEVENT->ATTENDEE)) foreach ($newObject->VEVENT->ATTENDEE as $attendee) {
+
+                    if ($attendee->getNormalizedValue() === $message->recipient) {
+                        if ($message->scheduleStatus) {
+                            $attendee['SCHEDULE-STATUS'] = $message->getScheduleStatus();
+                        }
+                        unset($attendee['SCHEDULE-FORCE-SEND']);
+                        break;
+                    }
+
+                }
+
+            }
+
+        }
+
+    }
+
+    /**
+     * Returns a list of addresses that are associated with a principal.
+     *
+     * @param string $principal
+     * @return array
+     */
+    protected function getAddressesForPrincipal($principal) {
+
+        $CUAS = '{' . self::NS_CALDAV . '}calendar-user-address-set';
+
+        $properties = $this->server->getProperties(
+            $principal,
+            [$CUAS]
+        );
+
+        // If we can't find this information, we'll stop processing
+        if (!isset($properties[$CUAS])) {
+            return;
+        }
+
+        $addresses = $properties[$CUAS]->getHrefs();
+        return $addresses;
+
+    }
+
+    /**
+     * This method handles POST requests to the schedule-outbox.
+     *
+     * Currently, two types of requests are support:
+     *   * FREEBUSY requests from RFC 6638
+     *   * Simple iTIP messages from draft-desruisseaux-caldav-sched-04
+     *
+     * The latter is from an expired early draft of the CalDAV scheduling
+     * extensions, but iCal depends on a feature from that spec, so we
+     * implement it.
+     *
+     * @param IOutbox $outboxNode
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function outboxRequest(IOutbox $outboxNode, RequestInterface $request, ResponseInterface $response) {
+
+        $outboxPath = $request->getPath();
+
+        // Parsing the request body
+        try {
+            $vObject = VObject\Reader::read($request->getBody());
+        } catch (VObject\ParseException $e) {
+            throw new BadRequest('The request body must be a valid iCalendar object. Parse error: ' . $e->getMessage());
+        }
+
+        // The incoming iCalendar object must have a METHOD property, and a
+        // component. The combination of both determines what type of request
+        // this is.
+        $componentType = null;
+        foreach ($vObject->getComponents() as $component) {
+            if ($component->name !== 'VTIMEZONE') {
+                $componentType = $component->name;
+                break;
+            }
+        }
+        if (is_null($componentType)) {
+            throw new BadRequest('We expected at least one VTODO, VJOURNAL, VFREEBUSY or VEVENT component');
+        }
+
+        // Validating the METHOD
+        $method = strtoupper((string)$vObject->METHOD);
+        if (!$method) {
+            throw new BadRequest('A METHOD property must be specified in iTIP messages');
+        }
+
+        // So we support one type of request:
+        //
+        // REQUEST with a VFREEBUSY component
+
+        $acl = $this->server->getPlugin('acl');
+
+        if ($componentType === 'VFREEBUSY' && $method === 'REQUEST') {
+
+            $acl && $acl->checkPrivileges($outboxPath, '{' . self::NS_CALDAV . '}schedule-query-freebusy');
+            $this->handleFreeBusyRequest($outboxNode, $vObject, $request, $response);
+
+            // Destroy circular references so PHP can GC the object.
+            $vObject->destroy();
+            unset($vObject);
+
+        } else {
+
+            throw new NotImplemented('We only support VFREEBUSY (REQUEST) on this endpoint');
+
+        }
+
+    }
+
+    /**
+     * This method is responsible for parsing a free-busy query request and
+     * returning it's result.
+     *
+     * @param IOutbox $outbox
+     * @param VObject\Component $vObject
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return string
+     */
+    protected function handleFreeBusyRequest(IOutbox $outbox, VObject\Component $vObject, RequestInterface $request, ResponseInterface $response) {
+
+        $vFreeBusy = $vObject->VFREEBUSY;
+        $organizer = $vFreeBusy->organizer;
+
+        $organizer = (string)$organizer;
+
+        // Validating if the organizer matches the owner of the inbox.
+        $owner = $outbox->getOwner();
+
+        $caldavNS = '{' . self::NS_CALDAV . '}';
+
+        $uas = $caldavNS . 'calendar-user-address-set';
+        $props = $this->server->getProperties($owner, [$uas]);
+
+        if (empty($props[$uas]) || !in_array($organizer, $props[$uas]->getHrefs())) {
+            throw new Forbidden('The organizer in the request did not match any of the addresses for the owner of this inbox');
+        }
+
+        if (!isset($vFreeBusy->ATTENDEE)) {
+            throw new BadRequest('You must at least specify 1 attendee');
+        }
+
+        $attendees = [];
+        foreach ($vFreeBusy->ATTENDEE as $attendee) {
+            $attendees[] = (string)$attendee;
+        }
+
+
+        if (!isset($vFreeBusy->DTSTART) || !isset($vFreeBusy->DTEND)) {
+            throw new BadRequest('DTSTART and DTEND must both be specified');
+        }
+
+        $startRange = $vFreeBusy->DTSTART->getDateTime();
+        $endRange = $vFreeBusy->DTEND->getDateTime();
+
+        $results = [];
+        foreach ($attendees as $attendee) {
+            $results[] = $this->getFreeBusyForEmail($attendee, $startRange, $endRange, $vObject);
+        }
+
+        $dom = new \DOMDocument('1.0', 'utf-8');
+        $dom->formatOutput = true;
+        $scheduleResponse = $dom->createElement('cal:schedule-response');
+        foreach ($this->server->xml->namespaceMap as $namespace => $prefix) {
+
+            $scheduleResponse->setAttribute('xmlns:' . $prefix, $namespace);
+
+        }
+        $dom->appendChild($scheduleResponse);
+
+        foreach ($results as $result) {
+            $xresponse = $dom->createElement('cal:response');
+
+            $recipient = $dom->createElement('cal:recipient');
+            $recipientHref = $dom->createElement('d:href');
+
+            $recipientHref->appendChild($dom->createTextNode($result['href']));
+            $recipient->appendChild($recipientHref);
+            $xresponse->appendChild($recipient);
+
+            $reqStatus = $dom->createElement('cal:request-status');
+            $reqStatus->appendChild($dom->createTextNode($result['request-status']));
+            $xresponse->appendChild($reqStatus);
+
+            if (isset($result['calendar-data'])) {
+
+                $calendardata = $dom->createElement('cal:calendar-data');
+                $calendardata->appendChild($dom->createTextNode(str_replace("\r\n", "\n", $result['calendar-data']->serialize())));
+                $xresponse->appendChild($calendardata);
+
+            }
+            $scheduleResponse->appendChild($xresponse);
+        }
+
+        $response->setStatus(200);
+        $response->setHeader('Content-Type', 'application/xml');
+        $response->setBody($dom->saveXML());
+
+    }
+
+    /**
+     * Returns free-busy information for a specific address. The returned
+     * data is an array containing the following properties:
+     *
+     * calendar-data : A VFREEBUSY VObject
+     * request-status : an iTip status code.
+     * href: The principal's email address, as requested
+     *
+     * The following request status codes may be returned:
+     *   * 2.0;description
+     *   * 3.7;description
+     *
+     * @param string $email address
+     * @param DateTimeInterface $start
+     * @param DateTimeInterface $end
+     * @param VObject\Component $request
+     * @return array
+     */
+    protected function getFreeBusyForEmail($email, \DateTimeInterface $start, \DateTimeInterface $end, VObject\Component $request) {
+
+        $caldavNS = '{' . self::NS_CALDAV . '}';
+
+        $aclPlugin = $this->server->getPlugin('acl');
+        if (substr($email, 0, 7) === 'mailto:') $email = substr($email, 7);
+
+        $result = $aclPlugin->principalSearch(
+            ['{http://sabredav.org/ns}email-address' => $email],
+            [
+                '{DAV:}principal-URL',
+                $caldavNS . 'calendar-home-set',
+                $caldavNS . 'schedule-inbox-URL',
+                '{http://sabredav.org/ns}email-address',
+
+            ]
+        );
+
+        if (!count($result)) {
+            return [
+                'request-status' => '3.7;Could not find principal',
+                'href'           => 'mailto:' . $email,
+            ];
+        }
+
+        if (!isset($result[0][200][$caldavNS . 'calendar-home-set'])) {
+            return [
+                'request-status' => '3.7;No calendar-home-set property found',
+                'href'           => 'mailto:' . $email,
+            ];
+        }
+        if (!isset($result[0][200][$caldavNS . 'schedule-inbox-URL'])) {
+            return [
+                'request-status' => '3.7;No schedule-inbox-URL property found',
+                'href'           => 'mailto:' . $email,
+            ];
+        }
+        $homeSet = $result[0][200][$caldavNS . 'calendar-home-set']->getHref();
+        $inboxUrl = $result[0][200][$caldavNS . 'schedule-inbox-URL']->getHref();
+
+        // Grabbing the calendar list
+        $objects = [];
+        $calendarTimeZone = new DateTimeZone('UTC');
+
+        foreach ($this->server->tree->getNodeForPath($homeSet)->getChildren() as $node) {
+            if (!$node instanceof ICalendar) {
+                continue;
+            }
+
+            $sct = $caldavNS . 'schedule-calendar-transp';
+            $ctz = $caldavNS . 'calendar-timezone';
+            $props = $node->getProperties([$sct, $ctz]);
+
+            if (isset($props[$sct]) && $props[$sct]->getValue() == ScheduleCalendarTransp::TRANSPARENT) {
+                // If a calendar is marked as 'transparent', it means we must
+                // ignore it for free-busy purposes.
+                continue;
+            }
+
+            $aclPlugin->checkPrivileges($homeSet . $node->getName(), $caldavNS . 'read-free-busy');
+
+            if (isset($props[$ctz])) {
+                $vtimezoneObj = VObject\Reader::read($props[$ctz]);
+                $calendarTimeZone = $vtimezoneObj->VTIMEZONE->getTimeZone();
+
+                // Destroy circular references so PHP can garbage collect the object.
+                $vtimezoneObj->destroy();
+
+            }
+
+            // Getting the list of object uris within the time-range
+            $urls = $node->calendarQuery([
+                'name'         => 'VCALENDAR',
+                'comp-filters' => [
+                    [
+                        'name'           => 'VEVENT',
+                        'comp-filters'   => [],
+                        'prop-filters'   => [],
+                        'is-not-defined' => false,
+                        'time-range'     => [
+                            'start' => $start,
+                            'end'   => $end,
+                        ],
+                    ],
+                ],
+                'prop-filters'   => [],
+                'is-not-defined' => false,
+                'time-range'     => null,
+            ]);
+
+            $calObjects = array_map(function($url) use ($node) {
+                $obj = $node->getChild($url)->get();
+                return $obj;
+            }, $urls);
+
+            $objects = array_merge($objects, $calObjects);
+
+        }
+
+        $inboxProps = $this->server->getProperties(
+            $inboxUrl,
+            $caldavNS . 'calendar-availability'
+        );
+
+        $vcalendar = new VObject\Component\VCalendar();
+        $vcalendar->METHOD = 'REPLY';
+
+        $generator = new VObject\FreeBusyGenerator();
+        $generator->setObjects($objects);
+        $generator->setTimeRange($start, $end);
+        $generator->setBaseObject($vcalendar);
+        $generator->setTimeZone($calendarTimeZone);
+
+        if ($inboxProps) {
+            $generator->setVAvailability(
+                VObject\Reader::read(
+                    $inboxProps[$caldavNS . 'calendar-availability']
+                )
+            );
+        }
+
+        $result = $generator->getResult();
+
+        $vcalendar->VFREEBUSY->ATTENDEE = 'mailto:' . $email;
+        $vcalendar->VFREEBUSY->UID = (string)$request->VFREEBUSY->UID;
+        $vcalendar->VFREEBUSY->ORGANIZER = clone $request->VFREEBUSY->ORGANIZER;
+
+        return [
+            'calendar-data'  => $result,
+            'request-status' => '2.0;Success',
+            'href'           => 'mailto:' . $email,
+        ];
+    }
+
+    /**
+     * This method checks the 'Schedule-Reply' header
+     * and returns false if it's 'F', otherwise true.
+     *
+     * @param RequestInterface $request
+     * @return bool
+     */
+    private function scheduleReply(RequestInterface $request) {
+
+        $scheduleReply = $request->getHeader('Schedule-Reply');
+        return $scheduleReply !== 'F';
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Adds calendar-auto-schedule, as defined in rf6868',
+            'link'        => 'http://sabre.io/dav/scheduling/',
+        ];
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/SchedulingObject.php b/vendor/sabre/dav/lib/CalDAV/Schedule/SchedulingObject.php
new file mode 100644
index 000000000..a36646e6c
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/SchedulingObject.php
@@ -0,0 +1,165 @@
+<?php
+
+namespace Sabre\CalDAV\Schedule;
+
+use Sabre\CalDAV\Backend;
+use Sabre\DAV\Exception\MethodNotAllowed;
+
+/**
+ * The SchedulingObject represents a scheduling object in the Inbox collection
+ *
+ * @author Brett (https://github.com/bretten)
+ * @license http://sabre.io/license/ Modified BSD License
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ */
+class SchedulingObject extends \Sabre\CalDAV\CalendarObject implements ISchedulingObject {
+
+    /**
+     /* The CalDAV backend
+     *
+     * @var Backend\SchedulingSupport
+     */
+    protected $caldavBackend;
+
+    /**
+     * Array with information about this SchedulingObject
+     *
+     * @var array
+     */
+    protected $objectData;
+
+    /**
+     * Constructor
+     *
+     * The following properties may be passed within $objectData:
+     *
+     *   * uri - A unique uri. Only the 'basename' must be passed.
+     *   * principaluri - the principal that owns the object.
+     *   * calendardata (optional) - The iCalendar data
+     *   * etag - (optional) The etag for this object, MUST be encloded with
+     *            double-quotes.
+     *   * size - (optional) The size of the data in bytes.
+     *   * lastmodified - (optional) format as a unix timestamp.
+     *   * acl - (optional) Use this to override the default ACL for the node.
+     *
+     * @param Backend\BackendInterface $caldavBackend
+     * @param array $objectData
+     */
+    function __construct(Backend\SchedulingSupport $caldavBackend, array $objectData) {
+
+        $this->caldavBackend = $caldavBackend;
+
+        if (!isset($objectData['uri'])) {
+            throw new \InvalidArgumentException('The objectData argument must contain an \'uri\' property');
+        }
+
+        $this->objectData = $objectData;
+
+    }
+
+    /**
+     * Returns the ICalendar-formatted object
+     *
+     * @return string
+     */
+    function get() {
+
+        // Pre-populating the 'calendardata' is optional, if we don't have it
+        // already we fetch it from the backend.
+        if (!isset($this->objectData['calendardata'])) {
+            $this->objectData = $this->caldavBackend->getSchedulingObject($this->objectData['principaluri'], $this->objectData['uri']);
+        }
+        return $this->objectData['calendardata'];
+
+    }
+
+    /**
+     * Updates the ICalendar-formatted object
+     *
+     * @param string|resource $calendarData
+     * @return string
+     */
+    function put($calendarData) {
+
+        throw new MethodNotAllowed('Updating scheduling objects is not supported');
+
+    }
+
+    /**
+     * Deletes the scheduling message
+     *
+     * @return void
+     */
+    function delete() {
+
+        $this->caldavBackend->deleteSchedulingObject($this->objectData['principaluri'], $this->objectData['uri']);
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getOwner() {
+
+        return $this->objectData['principaluri'];
+
+    }
+
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    function getACL() {
+
+        // An alternative acl may be specified in the object data.
+        //
+
+        if (isset($this->objectData['acl'])) {
+            return $this->objectData['acl'];
+        }
+
+        // The default ACL
+        return [
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->objectData['principaluri'],
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->objectData['principaluri'],
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->objectData['principaluri'] . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->objectData['principaluri'] . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->objectData['principaluri'] . '/calendar-proxy-read',
+                'protected' => true,
+            ],
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/ShareableCalendar.php b/vendor/sabre/dav/lib/CalDAV/ShareableCalendar.php
index cabf7eb95..c11695d5f 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/ShareableCalendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/ShareableCalendar.php
@@ -6,7 +6,7 @@ namespace Sabre\CalDAV;
  * This object represents a CalDAV calendar that can be shared with other
  * users.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -30,7 +30,7 @@ class ShareableCalendar extends Calendar implements IShareableCalendar {
      * @param array $remove
      * @return void
      */
-    public function updateShares(array $add, array $remove) {
+    function updateShares(array $add, array $remove) {
 
         $this->caldavBackend->updateShares($this->calendarInfo['id'], $add, $remove);
 
@@ -48,7 +48,7 @@ class ShareableCalendar extends Calendar implements IShareableCalendar {
      *
      * @return array
      */
-    public function getShares() {
+    function getShares() {
 
         return $this->caldavBackend->getShares($this->calendarInfo['id']);
 
@@ -63,7 +63,7 @@ class ShareableCalendar extends Calendar implements IShareableCalendar {
      * @param bool $value
      * @return void
      */
-    public function setPublishStatus($value) {
+    function setPublishStatus($value) {
 
         $this->caldavBackend->setPublishStatus($this->calendarInfo['id'], $value);
 
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/SharedCalendar.php b/vendor/sabre/dav/lib/CalDAV/SharedCalendar.php
index 79eda43ab..7973eff9c 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/SharedCalendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/SharedCalendar.php
@@ -2,12 +2,10 @@
 
 namespace Sabre\CalDAV;
 
-use Sabre\DAVACL;
-
 /**
  * This object represents a CalDAV calendar that is shared by a different user.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -19,14 +17,14 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      * @param Backend\BackendInterface $caldavBackend
      * @param array $calendarInfo
      */
-    public function __construct(Backend\BackendInterface $caldavBackend, $calendarInfo) {
+    function __construct(Backend\BackendInterface $caldavBackend, $calendarInfo) {
 
-        $required = array(
+        $required = [
             '{http://calendarserver.org/ns/}shared-url',
             '{http://sabredav.org/ns}owner-principal',
             '{http://sabredav.org/ns}read-only',
-        );
-        foreach($required as $r) {
+        ];
+        foreach ($required as $r) {
             if (!isset($calendarInfo[$r])) {
                 throw new \InvalidArgumentException('The ' . $r . ' property must be specified for SharedCalendar(s)');
             }
@@ -42,7 +40,7 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      *
      * @return string
      */
-    public function getSharedUrl() {
+    function getSharedUrl() {
 
         return $this->calendarInfo['{http://calendarserver.org/ns/}shared-url'];
 
@@ -55,7 +53,7 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      *
      * @return string|null
      */
-    public function getOwner() {
+    function getOwner() {
 
         return $this->calendarInfo['{http://sabredav.org/ns}owner-principal'];
 
@@ -73,28 +71,62 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
 
         // The top-level ACL only contains access information for the true
         // owner of the calendar, so we need to add the information for the
         // sharee.
         $acl = parent::getACL();
-        $acl[] = array(
+        $acl[] = [
             'privilege' => '{DAV:}read',
             'principal' => $this->calendarInfo['principaluri'],
             'protected' => true,
-        );
+        ];
+        if ($this->calendarInfo['{http://sabredav.org/ns}read-only']) {
+            $acl[] = [
+                'privilege' => '{DAV:}write-properties',
+                'principal' => $this->calendarInfo['principaluri'],
+                'protected' => true,
+            ];
+        } else {
+            $acl[] = [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->calendarInfo['principaluri'],
+                'protected' => true,
+            ];
+        }
+        return $acl;
+
+    }
+
+    /**
+     * This method returns the ACL's for calendar objects in this calendar.
+     * The result of this method automatically gets passed to the
+     * calendar-object nodes in the calendar.
+     *
+     * @return array
+     */
+    function getChildACL() {
+
+        $acl = parent::getChildACL();
+        $acl[] = [
+            'privilege' => '{DAV:}read',
+            'principal' => $this->calendarInfo['principaluri'],
+            'protected' => true,
+        ];
+
         if (!$this->calendarInfo['{http://sabredav.org/ns}read-only']) {
-            $acl[] = array(
+            $acl[] = [
                 'privilege' => '{DAV:}write',
                 'principal' => $this->calendarInfo['principaluri'],
                 'protected' => true,
-            );
+            ];
         }
         return $acl;
 
     }
 
+
     /**
      * Returns the list of people whom this calendar is shared with.
      *
@@ -107,7 +139,7 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      *
      * @return array
      */
-    public function getShares() {
+    function getShares() {
 
         return $this->caldavBackend->getShares($this->calendarInfo['id']);
 
diff --git a/vendor/sabre/dav/lib/CalDAV/SharingPlugin.php b/vendor/sabre/dav/lib/CalDAV/SharingPlugin.php
new file mode 100644
index 000000000..5154fb1de
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/SharingPlugin.php
@@ -0,0 +1,426 @@
+<?php
+
+namespace Sabre\CalDAV;
+
+use Sabre\DAV;
+use Sabre\DAV\Xml\Property\Href;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * This plugin implements support for caldav sharing.
+ *
+ * This spec is defined at:
+ * http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-sharing.txt
+ *
+ * See:
+ * Sabre\CalDAV\Backend\SharingSupport for all the documentation.
+ *
+ * Note: This feature is experimental, and may change in between different
+ * SabreDAV versions.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SharingPlugin extends DAV\ServerPlugin {
+
+    /**
+     * These are the various status constants used by sharing-messages.
+     */
+    const STATUS_ACCEPTED = 1;
+    const STATUS_DECLINED = 2;
+    const STATUS_DELETED = 3;
+    const STATUS_NORESPONSE = 4;
+    const STATUS_INVALID = 5;
+
+    /**
+     * Reference to SabreDAV server object.
+     *
+     * @var Sabre\DAV\Server
+     */
+    protected $server;
+
+    /**
+     * This method should return a list of server-features.
+     *
+     * This is for example 'versioning' and is added to the DAV: header
+     * in an OPTIONS response.
+     *
+     * @return array
+     */
+    function getFeatures() {
+
+        return ['calendarserver-sharing'];
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'caldav-sharing';
+
+    }
+
+    /**
+     * This initializes the plugin.
+     *
+     * This function is called by Sabre\DAV\Server, after
+     * addPlugin is called.
+     *
+     * This method should set up the required event subscriptions.
+     *
+     * @param DAV\Server $server
+     * @return void
+     */
+    function initialize(DAV\Server $server) {
+
+        $this->server = $server;
+        $server->resourceTypeMapping['Sabre\\CalDAV\\ISharedCalendar'] = '{' . Plugin::NS_CALENDARSERVER . '}shared';
+
+        array_push(
+            $this->server->protectedProperties,
+            '{' . Plugin::NS_CALENDARSERVER . '}invite',
+            '{' . Plugin::NS_CALENDARSERVER . '}allowed-sharing-modes',
+            '{' . Plugin::NS_CALENDARSERVER . '}shared-url'
+        );
+
+        $this->server->xml->elementMap['{' . Plugin::NS_CALENDARSERVER . '}share'] = 'Sabre\\CalDAV\\Xml\\Request\\Share';
+        $this->server->xml->elementMap['{' . Plugin::NS_CALENDARSERVER . '}invite-reply'] = 'Sabre\\CalDAV\\Xml\\Request\\InviteReply';
+
+        $this->server->on('propFind',     [$this, 'propFindEarly']);
+        $this->server->on('propFind',     [$this, 'propFindLate'], 150);
+        $this->server->on('propPatch',    [$this, 'propPatch'], 40);
+        $this->server->on('method:POST',  [$this, 'httpPost']);
+
+    }
+
+    /**
+     * This event is triggered when properties are requested for a certain
+     * node.
+     *
+     * This allows us to inject any properties early.
+     *
+     * @param DAV\PropFind $propFind
+     * @param DAV\INode $node
+     * @return void
+     */
+    function propFindEarly(DAV\PropFind $propFind, DAV\INode $node) {
+
+        if ($node instanceof IShareableCalendar) {
+
+            $propFind->handle('{' . Plugin::NS_CALENDARSERVER . '}invite', function() use ($node) {
+                return new Xml\Property\Invite(
+                    $node->getShares()
+                );
+            });
+
+        }
+
+        if ($node instanceof ISharedCalendar) {
+
+            $propFind->handle('{' . Plugin::NS_CALENDARSERVER . '}shared-url', function() use ($node) {
+                return new Href(
+                    $node->getSharedUrl()
+                );
+            });
+
+            $propFind->handle('{' . Plugin::NS_CALENDARSERVER . '}invite', function() use ($node) {
+
+                // Fetching owner information
+                $props = $this->server->getPropertiesForPath($node->getOwner(), [
+                    '{http://sabredav.org/ns}email-address',
+                    '{DAV:}displayname',
+                ], 0);
+
+                $ownerInfo = [
+                    'href' => $node->getOwner(),
+                ];
+
+                if (isset($props[0][200])) {
+
+                    // We're mapping the internal webdav properties to the
+                    // elements caldav-sharing expects.
+                    if (isset($props[0][200]['{http://sabredav.org/ns}email-address'])) {
+                        $ownerInfo['href'] = 'mailto:' . $props[0][200]['{http://sabredav.org/ns}email-address'];
+                    }
+                    if (isset($props[0][200]['{DAV:}displayname'])) {
+                        $ownerInfo['commonName'] = $props[0][200]['{DAV:}displayname'];
+                    }
+
+                }
+
+                return new Xml\Property\Invite(
+                    $node->getShares(),
+                    $ownerInfo
+                );
+
+            });
+
+        }
+
+    }
+
+    /**
+     * This method is triggered *after* all properties have been retrieved.
+     * This allows us to inject the correct resourcetype for calendars that
+     * have been shared.
+     *
+     * @param DAV\PropFind $propFind
+     * @param DAV\INode $node
+     * @return void
+     */
+    function propFindLate(DAV\PropFind $propFind, DAV\INode $node) {
+
+        if ($node instanceof IShareableCalendar) {
+            if ($rt = $propFind->get('{DAV:}resourcetype')) {
+                if (count($node->getShares()) > 0) {
+                    $rt->add('{' . Plugin::NS_CALENDARSERVER . '}shared-owner');
+                }
+            }
+            $propFind->handle('{' . Plugin::NS_CALENDARSERVER . '}allowed-sharing-modes', function() {
+                return new Xml\Property\AllowedSharingModes(true, false);
+            });
+
+        }
+
+    }
+
+    /**
+     * This method is trigged when a user attempts to update a node's
+     * properties.
+     *
+     * A previous draft of the sharing spec stated that it was possible to use
+     * PROPPATCH to remove 'shared-owner' from the resourcetype, thus unsharing
+     * the calendar.
+     *
+     * Even though this is no longer in the current spec, we keep this around
+     * because OS X 10.7 may still make use of this feature.
+     *
+     * @param string $path
+     * @param DAV\PropPatch $propPatch
+     * @return void
+     */
+    function propPatch($path, DAV\PropPatch $propPatch) {
+
+        $node = $this->server->tree->getNodeForPath($path);
+        if (!$node instanceof IShareableCalendar)
+            return;
+
+        $propPatch->handle('{DAV:}resourcetype', function($value) use ($node) {
+            if ($value->is('{' . Plugin::NS_CALENDARSERVER . '}shared-owner')) return false;
+            $shares = $node->getShares();
+            $remove = [];
+            foreach ($shares as $share) {
+                $remove[] = $share['href'];
+            }
+            $node->updateShares([], $remove);
+
+            return true;
+
+        });
+
+    }
+
+    /**
+     * We intercept this to handle POST requests on calendars.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return null|bool
+     */
+    function httpPost(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+
+        // Only handling xml
+        $contentType = $request->getHeader('Content-Type');
+        if (strpos($contentType, 'application/xml') === false && strpos($contentType, 'text/xml') === false)
+            return;
+
+        // Making sure the node exists
+        try {
+            $node = $this->server->tree->getNodeForPath($path);
+        } catch (DAV\Exception\NotFound $e) {
+            return;
+        }
+
+        $requestBody = $request->getBodyAsString();
+
+        // If this request handler could not deal with this POST request, it
+        // will return 'null' and other plugins get a chance to handle the
+        // request.
+        //
+        // However, we already requested the full body. This is a problem,
+        // because a body can only be read once. This is why we preemptively
+        // re-populated the request body with the existing data.
+        $request->setBody($requestBody);
+
+        $message = $this->server->xml->parse($requestBody, $request->getUrl(), $documentType);
+
+        switch ($documentType) {
+
+            // Dealing with the 'share' document, which modified invitees on a
+            // calendar.
+            case '{' . Plugin::NS_CALENDARSERVER . '}share' :
+
+                // We can only deal with IShareableCalendar objects
+                if (!$node instanceof IShareableCalendar) {
+                    return;
+                }
+
+                $this->server->transactionType = 'post-calendar-share';
+
+                // Getting ACL info
+                $acl = $this->server->getPlugin('acl');
+
+                // If there's no ACL support, we allow everything
+                if ($acl) {
+                    $acl->checkPrivileges($path, '{DAV:}write');
+                }
+
+                $node->updateShares($message->set, $message->remove);
+
+                $response->setStatus(200);
+                // Adding this because sending a response body may cause issues,
+                // and I wanted some type of indicator the response was handled.
+                $response->setHeader('X-Sabre-Status', 'everything-went-well');
+
+                // Breaking the event chain
+                return false;
+
+            // The invite-reply document is sent when the user replies to an
+            // invitation of a calendar share.
+            case '{' . Plugin::NS_CALENDARSERVER . '}invite-reply' :
+
+                // This only works on the calendar-home-root node.
+                if (!$node instanceof CalendarHome) {
+                    return;
+                }
+                $this->server->transactionType = 'post-invite-reply';
+
+                // Getting ACL info
+                $acl = $this->server->getPlugin('acl');
+
+                // If there's no ACL support, we allow everything
+                if ($acl) {
+                    $acl->checkPrivileges($path, '{DAV:}write');
+                }
+
+                $url = $node->shareReply(
+                    $message->href,
+                    $message->status,
+                    $message->calendarUri,
+                    $message->inReplyTo,
+                    $message->summary
+                );
+
+                $response->setStatus(200);
+                // Adding this because sending a response body may cause issues,
+                // and I wanted some type of indicator the response was handled.
+                $response->setHeader('X-Sabre-Status', 'everything-went-well');
+
+                if ($url) {
+                    $writer = $this->server->xml->getWriter($this->server->getBaseUri());
+                    $writer->openMemory();
+                    $writer->startDocument();
+                    $writer->startElement('{' . Plugin::NS_CALENDARSERVER . '}shared-as');
+                    $writer->write(new Href($url));
+                    $writer->endElement();
+                    $response->setHeader('Content-Type', 'application/xml');
+                    $response->setBody($writer->outputMemory());
+
+                }
+
+                // Breaking the event chain
+                return false;
+
+            case '{' . Plugin::NS_CALENDARSERVER . '}publish-calendar' :
+
+                // We can only deal with IShareableCalendar objects
+                if (!$node instanceof IShareableCalendar) {
+                    return;
+                }
+                $this->server->transactionType = 'post-publish-calendar';
+
+                // Getting ACL info
+                $acl = $this->server->getPlugin('acl');
+
+                // If there's no ACL support, we allow everything
+                if ($acl) {
+                    $acl->checkPrivileges($path, '{DAV:}write');
+                }
+
+                $node->setPublishStatus(true);
+
+                // iCloud sends back the 202, so we will too.
+                $response->setStatus(202);
+
+                // Adding this because sending a response body may cause issues,
+                // and I wanted some type of indicator the response was handled.
+                $response->setHeader('X-Sabre-Status', 'everything-went-well');
+
+                // Breaking the event chain
+                return false;
+
+            case '{' . Plugin::NS_CALENDARSERVER . '}unpublish-calendar' :
+
+                // We can only deal with IShareableCalendar objects
+                if (!$node instanceof IShareableCalendar) {
+                    return;
+                }
+                $this->server->transactionType = 'post-unpublish-calendar';
+
+                // Getting ACL info
+                $acl = $this->server->getPlugin('acl');
+
+                // If there's no ACL support, we allow everything
+                if ($acl) {
+                    $acl->checkPrivileges($path, '{DAV:}write');
+                }
+
+                $node->setPublishStatus(false);
+
+                $response->setStatus(200);
+
+                // Adding this because sending a response body may cause issues,
+                // and I wanted some type of indicator the response was handled.
+                $response->setHeader('X-Sabre-Status', 'everything-went-well');
+
+                // Breaking the event chain
+                return false;
+
+        }
+
+
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Adds support for caldav-sharing.',
+            'link'        => 'http://sabre.io/dav/caldav-sharing/',
+        ];
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Subscriptions/ISubscription.php b/vendor/sabre/dav/lib/CalDAV/Subscriptions/ISubscription.php
new file mode 100644
index 000000000..7ba259c7b
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Subscriptions/ISubscription.php
@@ -0,0 +1,40 @@
+<?php
+
+namespace Sabre\CalDAV\Subscriptions;
+
+use Sabre\DAV\ICollection;
+use Sabre\DAV\IProperties;
+
+/**
+ * ISubscription
+ *
+ * Nodes implementing this interface represent calendar subscriptions.
+ *
+ * The subscription node doesn't do much, other than returning and updating
+ * subscription-related properties.
+ *
+ * The following properties should be supported:
+ *
+ * 1. {DAV:}displayname
+ * 2. {http://apple.com/ns/ical/}refreshrate
+ * 3. {http://calendarserver.org/ns/}subscribed-strip-todos (omit if todos
+ *    should not be stripped).
+ * 4. {http://calendarserver.org/ns/}subscribed-strip-alarms (omit if alarms
+ *    should not be stripped).
+ * 5. {http://calendarserver.org/ns/}subscribed-strip-attachments (omit if
+ *    attachments should not be stripped).
+ * 6. {http://calendarserver.org/ns/}source (Must be a
+ *     Sabre\DAV\Property\Href).
+ * 7. {http://apple.com/ns/ical/}calendar-color
+ * 8. {http://apple.com/ns/ical/}calendar-order
+ *
+ * It is recommended to support every property.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface ISubscription extends ICollection, IProperties {
+
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Subscriptions/Plugin.php b/vendor/sabre/dav/lib/CalDAV/Subscriptions/Plugin.php
new file mode 100644
index 000000000..7abbfb1f9
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Subscriptions/Plugin.php
@@ -0,0 +1,120 @@
+<?php
+
+namespace Sabre\CalDAV\Subscriptions;
+
+use Sabre\DAV\INode;
+use Sabre\DAV\PropFind;
+use Sabre\DAV\ServerPlugin;
+use Sabre\DAV\Server;
+
+/**
+ * This plugin adds calendar-subscription support to your CalDAV server.
+ *
+ * Some clients support 'managed subscriptions' server-side. This is basically
+ * a list of subscription urls a user is using.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends ServerPlugin {
+
+    /**
+     * This initializes the plugin.
+     *
+     * This function is called by Sabre\DAV\Server, after
+     * addPlugin is called.
+     *
+     * This method should set up the required event subscriptions.
+     *
+     * @param Server $server
+     * @return void
+     */
+    function initialize(Server $server) {
+
+        $server->resourceTypeMapping['Sabre\\CalDAV\\Subscriptions\\ISubscription'] =
+            '{http://calendarserver.org/ns/}subscribed';
+
+        $server->xml->elementMap['{http://calendarserver.org/ns/}source'] =
+            'Sabre\\DAV\\Xml\\Property\\Href';
+
+        $server->on('propFind', [$this, 'propFind'], 150);
+
+    }
+
+    /**
+     * This method should return a list of server-features.
+     *
+     * This is for example 'versioning' and is added to the DAV: header
+     * in an OPTIONS response.
+     *
+     * @return array
+     */
+    function getFeatures() {
+
+        return ['calendarserver-subscribed'];
+
+    }
+
+    /**
+     * Triggered after properties have been fetched.
+     *
+     * @param PropFind $propFind
+     * @param INode $node
+     * @return void
+     */
+    function propFind(PropFind $propFind, INode $node) {
+
+        // There's a bunch of properties that must appear as a self-closing
+        // xml-element. This event handler ensures that this will be the case.
+        $props = [
+            '{http://calendarserver.org/ns/}subscribed-strip-alarms',
+            '{http://calendarserver.org/ns/}subscribed-strip-attachments',
+            '{http://calendarserver.org/ns/}subscribed-strip-todos',
+        ];
+
+        foreach ($props as $prop) {
+
+            if ($propFind->getStatus($prop) === 200) {
+                $propFind->set($prop, '', 200);
+            }
+
+        }
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using \Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'subscriptions';
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'This plugin allows users to store iCalendar subscriptions in their calendar-home.',
+            'link'        => null,
+        ];
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php b/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php
new file mode 100644
index 000000000..ee53da2c6
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php
@@ -0,0 +1,274 @@
+<?php
+
+namespace Sabre\CalDAV\Subscriptions;
+
+use Sabre\DAV\Collection;
+use Sabre\DAV\Xml\Property\Href;
+use Sabre\DAV\PropPatch;
+use Sabre\DAV\Exception\MethodNotAllowed;
+use Sabre\DAVACL\IACL;
+use Sabre\CalDAV\Backend\SubscriptionSupport;
+
+/**
+ * Subscription Node
+ *
+ * This node represents a subscription.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Subscription extends Collection implements ISubscription, IACL {
+
+    /**
+     * caldavBackend
+     *
+     * @var SupportsSubscriptions
+     */
+    protected $caldavBackend;
+
+    /**
+     * subscriptionInfo
+     *
+     * @var array
+     */
+    protected $subscriptionInfo;
+
+    /**
+     * Constructor
+     *
+     * @param SubscriptionSupport $caldavBackend
+     * @param array $calendarInfo
+     */
+    function __construct(SubscriptionSupport $caldavBackend, array $subscriptionInfo) {
+
+        $this->caldavBackend = $caldavBackend;
+        $this->subscriptionInfo = $subscriptionInfo;
+
+        $required = [
+            'id',
+            'uri',
+            'principaluri',
+            'source',
+            ];
+
+        foreach ($required as $r) {
+            if (!isset($subscriptionInfo[$r])) {
+                throw new \InvalidArgumentException('The ' . $r . ' field is required when creating a subscription node');
+            }
+        }
+
+    }
+
+    /**
+     * Returns the name of the node.
+     *
+     * This is used to generate the url.
+     *
+     * @return string
+     */
+    function getName() {
+
+        return $this->subscriptionInfo['uri'];
+
+    }
+
+    /**
+     * Returns the last modification time
+     *
+     * @return int
+     */
+    function getLastModified() {
+
+        if (isset($this->subscriptionInfo['lastmodified'])) {
+            return $this->subscriptionInfo['lastmodified'];
+        }
+
+    }
+
+    /**
+     * Deletes the current node
+     *
+     * @return void
+     */
+    function delete() {
+
+        $this->caldavBackend->deleteSubscription(
+            $this->subscriptionInfo['id']
+        );
+
+    }
+
+    /**
+     * Returns an array with all the child nodes
+     *
+     * @return DAV\INode[]
+     */
+    function getChildren() {
+
+        return [];
+
+    }
+
+    /**
+     * Updates properties on this node.
+     *
+     * This method received a PropPatch object, which contains all the
+     * information about the update.
+     *
+     * To update specific properties, call the 'handle' method on this object.
+     * Read the PropPatch documentation for more information.
+     *
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    function propPatch(PropPatch $propPatch) {
+
+        return $this->caldavBackend->updateSubscription(
+            $this->subscriptionInfo['id'],
+            $propPatch
+        );
+
+    }
+
+    /**
+     * Returns a list of properties for this nodes.
+     *
+     * The properties list is a list of propertynames the client requested,
+     * encoded in clark-notation {xmlnamespace}tagname.
+     *
+     * If the array is empty, it means 'all properties' were requested.
+     *
+     * Note that it's fine to liberally give properties back, instead of
+     * conforming to the list of requested properties.
+     * The Server class will filter out the extra.
+     *
+     * @param array $properties
+     * @return void
+     */
+    function getProperties($properties) {
+
+        $r = [];
+
+        foreach ($properties as $prop) {
+
+            switch ($prop) {
+                case '{http://calendarserver.org/ns/}source' :
+                    $r[$prop] = new Href($this->subscriptionInfo['source'], false);
+                    break;
+                default :
+                    if (array_key_exists($prop, $this->subscriptionInfo)) {
+                        $r[$prop] = $this->subscriptionInfo[$prop];
+                    }
+                    break;
+            }
+
+        }
+
+        return $r;
+
+    }
+
+    /**
+     * Returns the owner principal.
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getOwner() {
+
+        return $this->subscriptionInfo['principaluri'];
+
+    }
+
+    /**
+     * Returns a group principal.
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getGroup() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    function getACL() {
+
+        return [
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner() . '/calendar-proxy-read',
+                'protected' => true,
+            ]
+        ];
+
+    }
+
+    /**
+     * Updates the ACL.
+     *
+     * This method will receive a list of new ACE's.
+     *
+     * @param array $acl
+     * @return void
+     */
+    function setACL(array $acl) {
+
+        throw new MethodNotAllowed('Changing ACL is not yet supported');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See \Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    function getSupportedPrivilegeSet() {
+
+        return null;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CalendarData.php b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CalendarData.php
new file mode 100644
index 000000000..9babcf15c
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CalendarData.php
@@ -0,0 +1,84 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Filter;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\CalDAV\Plugin;
+use Sabre\VObject\DateTimeParser;
+
+/**
+ * CalendarData parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:caldav}calendar-data XML
+ * element, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4791#section-9.6
+ *
+ * This element is used in three distinct places in the caldav spec, but in
+ * this case, this element class only implements the calendar-data element as
+ * it appears in a DAV:prop element, in a calendar-query or calendar-multiget
+ * REPORT request.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class CalendarData implements XmlDeserializable {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $result = [
+            'contentType' => $reader->getAttribute('content-type') ?: 'text/calendar',
+            'version'     => $reader->getAttribute('version') ?: '2.0',
+        ];
+
+        $elems = (array)$reader->parseInnerTree();
+        foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+                case '{' . Plugin::NS_CALDAV . '}expand' :
+
+                    $result['expand'] = [
+                        'start' => isset($elem['attributes']['start']) ? DateTimeParser::parseDateTime($elem['attributes']['start']) : null,
+                        'end'   => isset($elem['attributes']['end']) ? DateTimeParser::parseDateTime($elem['attributes']['end']) : null,
+                    ];
+
+                    if (!$result['expand']['start'] || !$result['expand']['end']) {
+                        throw new BadRequest('The "start" and "end" attributes are required when expanding calendar-data');
+                    }
+                    if ($result['expand']['end'] <= $result['expand']['start']) {
+                        throw new BadRequest('The end-date must be larger than the start-date when expanding calendar-data');
+                    }
+                    break;
+            }
+
+        }
+
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CompFilter.php b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CompFilter.php
new file mode 100644
index 000000000..c9b27dbfd
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CompFilter.php
@@ -0,0 +1,97 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Filter;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\CalDAV\Plugin;
+use Sabre\VObject\DateTimeParser;
+
+/**
+ * CompFilter parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:caldav}comp-filter XML
+ * element, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4791#section-9.6
+ *
+ * The result will be spit out as an array.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class CompFilter implements XmlDeserializable {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $result = [
+            'name'           => null,
+            'is-not-defined' => false,
+            'comp-filters'   => [],
+            'prop-filters'   => [],
+            'time-range'     => false,
+        ];
+
+        $att = $reader->parseAttributes();
+        $result['name'] = $att['name'];
+
+        $elems = $reader->parseInnerTree();
+
+        if (is_array($elems)) foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{' . Plugin::NS_CALDAV . '}comp-filter' :
+                    $result['comp-filters'][] = $elem['value'];
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}prop-filter' :
+                    $result['prop-filters'][] = $elem['value'];
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}is-not-defined' :
+                    $result['is-not-defined'] = true;
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}time-range' :
+                    if ($result['name'] === 'VCALENDAR') {
+                        throw new BadRequest('You cannot add time-range filters on the VCALENDAR component');
+                    }
+                    $result['time-range'] = [
+                        'start' => isset($elem['attributes']['start']) ? DateTimeParser::parseDateTime($elem['attributes']['start']) : null,
+                        'end'   => isset($elem['attributes']['end']) ? DateTimeParser::parseDateTime($elem['attributes']['end']) : null,
+                    ];
+                    if ($result['time-range']['start'] && $result['time-range']['end'] && $result['time-range']['end'] <= $result['time-range']['start']) {
+                        throw new BadRequest('The end-date must be larger than the start-date');
+                    }
+                    break;
+
+            }
+
+        }
+
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Filter/ParamFilter.php b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/ParamFilter.php
new file mode 100644
index 000000000..eb7f564df
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/ParamFilter.php
@@ -0,0 +1,82 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Filter;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * PropFilter parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:caldav}param-filter XML
+ * element, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4791#section-9.7.3
+ *
+ * The result will be spit out as an array.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class ParamFilter implements XmlDeserializable {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * Important note 2: You are responsible for advancing the reader to the
+     * next element. Not doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $result = [
+            'name'           => null,
+            'is-not-defined' => false,
+            'text-match'     => null,
+        ];
+
+        $att = $reader->parseAttributes();
+        $result['name'] = $att['name'];
+
+        $elems = $reader->parseInnerTree();
+
+        if (is_array($elems)) foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{' . Plugin::NS_CALDAV . '}is-not-defined' :
+                    $result['is-not-defined'] = true;
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}text-match' :
+                    $result['text-match'] = [
+                        'negate-condition' => isset($elem['attributes']['negate-condition']) && $elem['attributes']['negate-condition'] === 'yes',
+                        'collation'        => isset($elem['attributes']['collation']) ? $elem['attributes']['collation'] : 'i;ascii-casemap',
+                        'value'            => $elem['value'],
+                    ];
+                    break;
+
+            }
+
+        }
+
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Filter/PropFilter.php b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/PropFilter.php
new file mode 100644
index 000000000..4c2e1b172
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/PropFilter.php
@@ -0,0 +1,98 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Filter;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\CalDAV\Plugin;
+use Sabre\VObject\DateTimeParser;
+
+/**
+ * PropFilter parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:caldav}prop-filter XML
+ * element, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4791#section-9.7.2
+ *
+ * The result will be spit out as an array.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PropFilter implements XmlDeserializable {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $result = [
+            'name'           => null,
+            'is-not-defined' => false,
+            'param-filters'  => [],
+            'text-match'     => null,
+            'time-range'     => false,
+        ];
+
+        $att = $reader->parseAttributes();
+        $result['name'] = $att['name'];
+
+        $elems = $reader->parseInnerTree();
+
+        if (is_array($elems)) foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{' . Plugin::NS_CALDAV . '}param-filter' :
+                    $result['param-filters'][] = $elem['value'];
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}is-not-defined' :
+                    $result['is-not-defined'] = true;
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}time-range' :
+                    $result['time-range'] = [
+                        'start' => isset($elem['attributes']['start']) ? DateTimeParser::parseDateTime($elem['attributes']['start']) : null,
+                        'end'   => isset($elem['attributes']['end']) ? DateTimeParser::parseDateTime($elem['attributes']['end']) : null,
+                    ];
+                    if ($result['time-range']['start'] && $result['time-range']['end'] && $result['time-range']['end'] <= $result['time-range']['start']) {
+                        throw new BadRequest('The end-date must be larger than the start-date');
+                    }
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}text-match' :
+                    $result['text-match'] = [
+                        'negate-condition' => isset($elem['attributes']['negate-condition']) && $elem['attributes']['negate-condition'] === 'yes',
+                        'collation'        => isset($elem['attributes']['collation']) ? $elem['attributes']['collation'] : 'i;ascii-casemap',
+                        'value'            => $elem['value'],
+                    ];
+                    break;
+
+            }
+
+        }
+
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Notification/Invite.php b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/Invite.php
index 8d6974d45..7fb022e33 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Notification/Invite.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/Invite.php
@@ -1,19 +1,22 @@
 <?php
 
-namespace Sabre\CalDAV\Notifications\Notification;
+namespace Sabre\CalDAV\Xml\Notification;
 
+use Sabre\Xml\Writer;
 use Sabre\CalDAV\SharingPlugin as SharingPlugin;
-use Sabre\DAV;
 use Sabre\CalDAV;
 
 /**
  * This class represents the cs:invite-notification notification element.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * This element is defined here:
+ * http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-sharing.txt
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Invite extends DAV\Property implements CalDAV\Notifications\INotificationType {
+class Invite implements NotificationInterface {
 
     /**
      * A unique id for the message
@@ -134,9 +137,9 @@ class Invite extends DAV\Property implements CalDAV\Notifications\INotificationT
      *
      * @param array $values All the options
      */
-    public function __construct(array $values) {
+    function __construct(array $values) {
 
-        $required = array(
+        $required = [
             'id',
             'etag',
             'href',
@@ -145,14 +148,14 @@ class Invite extends DAV\Property implements CalDAV\Notifications\INotificationT
             'readOnly',
             'hostUrl',
             'organizer',
-        );
-        foreach($required as $item) {
+        ];
+        foreach ($required as $item) {
             if (!isset($values[$item])) {
                 throw new \InvalidArgumentException($item . ' is a required constructor option');
             }
         }
 
-        foreach($values as $key=>$value) {
+        foreach ($values as $key => $value) {
             if (!property_exists($this, $key)) {
                 throw new \InvalidArgumentException('Unknown option: ' . $key);
             }
@@ -162,19 +165,27 @@ class Invite extends DAV\Property implements CalDAV\Notifications\INotificationT
     }
 
     /**
-     * Serializes the notification as a single property.
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
      *
-     * You should usually just encode the single top-level element of the
-     * notification.
+     * This allows serializers to be re-used for different element names.
      *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
      * @return void
      */
-    public function serialize(DAV\Server $server, \DOMElement $node) {
+    function xmlSerialize(Writer $writer) {
 
-        $prop = $node->ownerDocument->createElement('cs:invite-notification');
-        $node->appendChild($prop);
+        $writer->writeElement('{' . CalDAV\Plugin::NS_CALENDARSERVER . '}invite-notification');
 
     }
 
@@ -182,116 +193,88 @@ class Invite extends DAV\Property implements CalDAV\Notifications\INotificationT
      * This method serializes the entire notification, as it is used in the
      * response body.
      *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
+     * @param Writer $writer
      * @return void
      */
-    public function serializeBody(DAV\Server $server, \DOMElement $node) {
+    function xmlSerializeFull(Writer $writer) {
 
-        $doc = $node->ownerDocument;
+        $cs = '{' . CalDAV\Plugin::NS_CALENDARSERVER . '}';
 
-        $dt = $doc->createElement('cs:dtstamp');
         $this->dtStamp->setTimezone(new \DateTimezone('GMT'));
-        $dt->appendChild($doc->createTextNode($this->dtStamp->format('Ymd\\THis\\Z')));
-        $node->appendChild($dt);
-
-        $prop = $doc->createElement('cs:invite-notification');
-        $node->appendChild($prop);
+        $writer->writeElement($cs . 'dtstamp', $this->dtStamp->format('Ymd\\THis\\Z'));
 
-        $uid = $doc->createElement('cs:uid');
-        $uid->appendChild( $doc->createTextNode($this->id) );
-        $prop->appendChild($uid);
+        $writer->startElement($cs . 'invite-notification');
 
-        $href = $doc->createElement('d:href');
-        $href->appendChild( $doc->createTextNode( $this->href ) );
-        $prop->appendChild($href);
+        $writer->writeElement($cs . 'uid', $this->id);
+        $writer->writeElement('{DAV:}href', $this->href);
 
-        $nodeName = null;
-        switch($this->type) {
+        switch ($this->type) {
 
             case SharingPlugin::STATUS_ACCEPTED :
-                $nodeName = 'cs:invite-accepted';
+                $writer->writeElement($cs . 'invite-accepted');
                 break;
             case SharingPlugin::STATUS_DECLINED :
-                $nodeName = 'cs:invite-declined';
+                $writer->writeElement($cs . 'invite-declined');
                 break;
             case SharingPlugin::STATUS_DELETED :
-                $nodeName = 'cs:invite-deleted';
+                $writer->writeElement($cs . 'invite-deleted');
                 break;
             case SharingPlugin::STATUS_NORESPONSE :
-                $nodeName = 'cs:invite-noresponse';
+                $writer->writeElement($cs . 'invite-noresponse');
                 break;
 
         }
-        $prop->appendChild(
-            $doc->createElement($nodeName)
-        );
-        $hostHref = $doc->createElement('d:href', $server->getBaseUri() . $this->hostUrl);
-        $hostUrl  = $doc->createElement('cs:hosturl');
-        $hostUrl->appendChild($hostHref);
-        $prop->appendChild($hostUrl);
-
-        $access = $doc->createElement('cs:access');
+
+        $writer->writeElement($cs . 'hosturl', [
+            '{DAV:}href' => $writer->contextUri . $this->hostUrl
+            ]);
+
+        if ($this->summary) {
+            $writer->writeElement($cs . 'summary', $this->summary);
+        }
+
+        $writer->startElement($cs . 'access');
         if ($this->readOnly) {
-            $access->appendChild($doc->createElement('cs:read'));
+            $writer->writeElement($cs . 'read');
         } else {
-            $access->appendChild($doc->createElement('cs:read-write'));
+            $writer->writeElement($cs . 'read-write');
         }
-        $prop->appendChild($access);
+        $writer->endElement(); // access
 
-        $organizerUrl  = $doc->createElement('cs:organizer');
+        $writer->startElement($cs . 'organizer');
         // If the organizer contains a 'mailto:' part, it means it should be
         // treated as absolute.
-        if (strtolower(substr($this->organizer,0,7))==='mailto:') {
-            $organizerHref = new DAV\Property\Href($this->organizer, false);
+        if (strtolower(substr($this->organizer, 0, 7)) === 'mailto:') {
+            $writer->writeElement('{DAV:}href', $this->organizer);
         } else {
-            $organizerHref = new DAV\Property\Href($this->organizer, true);
+            $writer->writeElement('{DAV:}href', $writer->contextUri . $this->organizer);
         }
-        $organizerHref->serialize($server, $organizerUrl);
-
         if ($this->commonName) {
-            $commonName = $doc->createElement('cs:common-name');
-            $commonName->appendChild($doc->createTextNode($this->commonName));
-            $organizerUrl->appendChild($commonName);
-
-            $commonNameOld = $doc->createElement('cs:organizer-cn');
-            $commonNameOld->appendChild($doc->createTextNode($this->commonName));
-            $prop->appendChild($commonNameOld);
-
+            $writer->writeElement($cs . 'common-name', $this->commonName);
         }
         if ($this->firstName) {
-            $firstName = $doc->createElement('cs:first-name');
-            $firstName->appendChild($doc->createTextNode($this->firstName));
-            $organizerUrl->appendChild($firstName);
-
-            $firstNameOld = $doc->createElement('cs:organizer-first');
-            $firstNameOld->appendChild($doc->createTextNode($this->firstName));
-            $prop->appendChild($firstNameOld);
+            $writer->writeElement($cs . 'first-name', $this->firstName);
         }
         if ($this->lastName) {
-            $lastName = $doc->createElement('cs:last-name');
-            $lastName->appendChild($doc->createTextNode($this->lastName));
-            $organizerUrl->appendChild($lastName);
-
-            $lastNameOld = $doc->createElement('cs:organizer-last');
-            $lastNameOld->appendChild($doc->createTextNode($this->lastName));
-            $prop->appendChild($lastNameOld);
+            $writer->writeElement($cs . 'last-name', $this->lastName);
         }
-        $prop->appendChild($organizerUrl);
+        $writer->endElement(); // organizer
 
-        if ($this->summary) {
-            $summary = $doc->createElement('cs:summary');
-            $summary->appendChild($doc->createTextNode($this->summary));
-            $prop->appendChild($summary);
+        if ($this->commonName) {
+            $writer->writeElement($cs . 'organizer-cn', $this->commonName);
+        }
+        if ($this->firstName) {
+            $writer->writeElement($cs . 'organizer-first', $this->firstName);
+        }
+        if ($this->lastName) {
+            $writer->writeElement($cs . 'organizer-last', $this->lastName);
         }
         if ($this->supportedComponents) {
-
-            $xcomp = $doc->createElement('cal:supported-calendar-component-set');
-            $this->supportedComponents->serialize($server, $xcomp);
-            $prop->appendChild($xcomp);
-
+            $writer->writeElement('{' . CalDAV\Plugin::NS_CALDAV . '}supported-calendar-component-set', $this->supportedComponents);
         }
 
+        $writer->endElement(); // invite-notification
+
     }
 
     /**
@@ -302,7 +285,7 @@ class Invite extends DAV\Property implements CalDAV\Notifications\INotificationT
      *
      * @return string
      */
-    public function getId() {
+    function getId() {
 
         return $this->id;
 
@@ -315,7 +298,7 @@ class Invite extends DAV\Property implements CalDAV\Notifications\INotificationT
      *
      * @return string
      */
-    public function getETag() {
+    function getETag() {
 
         return $this->etag;
 
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Notification/InviteReply.php b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/InviteReply.php
index e40751346..945323fed 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Notification/InviteReply.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/InviteReply.php
@@ -1,19 +1,19 @@
 <?php
 
-namespace Sabre\CalDAV\Notifications\Notification;
+namespace Sabre\CalDAV\Xml\Notification;
 
-use Sabre\CalDAV\SharingPlugin as SharingPlugin;
-use Sabre\DAV;
+use Sabre\Xml\Writer;
 use Sabre\CalDAV;
+use Sabre\CalDAV\SharingPlugin;
 
 /**
  * This class represents the cs:invite-reply notification element.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class InviteReply extends DAV\Property implements CalDAV\Notifications\INotificationType {
+class InviteReply implements NotificationInterface {
 
     /**
      * A unique id for the message
@@ -86,10 +86,12 @@ class InviteReply extends DAV\Property implements CalDAV\Notifications\INotifica
      *   * hostUrl      - A url to the shared calendar.
      *   * summary      - Description of the share, can be the same as the
      *                    calendar, but may also be modified (optional).
+     *
+     * @param array $values
      */
-    public function __construct(array $values) {
+    function __construct(array $values) {
 
-        $required = array(
+        $required = [
             'id',
             'etag',
             'href',
@@ -97,14 +99,14 @@ class InviteReply extends DAV\Property implements CalDAV\Notifications\INotifica
             'inReplyTo',
             'type',
             'hostUrl',
-        );
-        foreach($required as $item) {
+        ];
+        foreach ($required as $item) {
             if (!isset($values[$item])) {
                 throw new \InvalidArgumentException($item . ' is a required constructor option');
             }
         }
 
-        foreach($values as $key=>$value) {
+        foreach ($values as $key => $value) {
             if (!property_exists($this, $key)) {
                 throw new \InvalidArgumentException('Unknown option: ' . $key);
             }
@@ -114,19 +116,27 @@ class InviteReply extends DAV\Property implements CalDAV\Notifications\INotifica
     }
 
     /**
-     * Serializes the notification as a single property.
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
      *
-     * You should usually just encode the single top-level element of the
-     * notification.
+     * If you are opening new elements, you must also close them again.
      *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
+     * @param Writer $writer
      * @return void
      */
-    public function serialize(DAV\Server $server, \DOMElement $node) {
+    function xmlSerialize(Writer $writer) {
 
-        $prop = $node->ownerDocument->createElement('cs:invite-reply');
-        $node->appendChild($prop);
+        $writer->writeElement('{' . CalDAV\Plugin::NS_CALENDARSERVER . '}invite-reply');
 
     }
 
@@ -134,58 +144,41 @@ class InviteReply extends DAV\Property implements CalDAV\Notifications\INotifica
      * This method serializes the entire notification, as it is used in the
      * response body.
      *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
+     * @param Writer $writer
      * @return void
      */
-    public function serializeBody(DAV\Server $server, \DOMElement $node) {
+    function xmlSerializeFull(Writer $writer) {
 
-        $doc = $node->ownerDocument;
+        $cs = '{' . CalDAV\Plugin::NS_CALENDARSERVER . '}';
 
-        $dt = $doc->createElement('cs:dtstamp');
         $this->dtStamp->setTimezone(new \DateTimezone('GMT'));
-        $dt->appendChild($doc->createTextNode($this->dtStamp->format('Ymd\\THis\\Z')));
-        $node->appendChild($dt);
+        $writer->writeElement($cs . 'dtstamp', $this->dtStamp->format('Ymd\\THis\\Z'));
 
-        $prop = $doc->createElement('cs:invite-reply');
-        $node->appendChild($prop);
+        $writer->startElement($cs . 'invite-reply');
 
-        $uid = $doc->createElement('cs:uid');
-        $uid->appendChild($doc->createTextNode($this->id));
-        $prop->appendChild($uid);
+        $writer->writeElement($cs . 'uid', $this->id);
+        $writer->writeElement($cs . 'in-reply-to', $this->inReplyTo);
+        $writer->writeElement('{DAV:}href', $this->href);
 
-        $inReplyTo = $doc->createElement('cs:in-reply-to');
-        $inReplyTo->appendChild( $doc->createTextNode($this->inReplyTo) );
-        $prop->appendChild($inReplyTo);
-
-        $href = $doc->createElement('d:href');
-        $href->appendChild( $doc->createTextNode($this->href) );
-        $prop->appendChild($href);
-
-        $nodeName = null;
-        switch($this->type) {
+        switch ($this->type) {
 
             case SharingPlugin::STATUS_ACCEPTED :
-                $nodeName = 'cs:invite-accepted';
+                $writer->writeElement($cs . 'invite-accepted');
                 break;
             case SharingPlugin::STATUS_DECLINED :
-                $nodeName = 'cs:invite-declined';
+                $writer->writeElement($cs . 'invite-declined');
                 break;
 
         }
-        $prop->appendChild(
-            $doc->createElement($nodeName)
-        );
-        $hostHref = $doc->createElement('d:href', $server->getBaseUri() . $this->hostUrl);
-        $hostUrl  = $doc->createElement('cs:hosturl');
-        $hostUrl->appendChild($hostHref);
-        $prop->appendChild($hostUrl);
+
+        $writer->writeElement($cs . 'hosturl', [
+            '{DAV:}href' => $writer->contextUri . $this->hostUrl
+            ]);
 
         if ($this->summary) {
-            $summary = $doc->createElement('cs:summary');
-            $summary->appendChild($doc->createTextNode($this->summary));
-            $prop->appendChild($summary);
+            $writer->writeElement($cs . 'summary', $this->summary);
         }
+        $writer->endElement(); // invite-reply
 
     }
 
@@ -197,7 +190,7 @@ class InviteReply extends DAV\Property implements CalDAV\Notifications\INotifica
      *
      * @return string
      */
-    public function getId() {
+    function getId() {
 
         return $this->id;
 
@@ -210,9 +203,10 @@ class InviteReply extends DAV\Property implements CalDAV\Notifications\INotifica
      *
      * @return string
      */
-    public function getETag() {
+    function getETag() {
 
         return $this->etag;
 
     }
+
 }
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/INotificationType.php b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/NotificationInterface.php
index b646399b9..1c08f12fd 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/INotificationType.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/NotificationInterface.php
@@ -1,26 +1,27 @@
 <?php
 
-namespace Sabre\CalDAV\Notifications;
-use Sabre\DAV;
+namespace Sabre\CalDAV\Xml\Notification;
+
+use Sabre\Xml\XmlSerializable;
+use Sabre\Xml\Writer;
 
 /**
  * This interface reflects a single notification type.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface INotificationType extends DAV\PropertyInterface {
+interface NotificationInterface extends XmlSerializable {
 
     /**
      * This method serializes the entire notification, as it is used in the
      * response body.
      *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
+     * @param Writer $writer
      * @return void
      */
-    function serializeBody(DAV\Server $server, \DOMElement $node);
+    function xmlSerializeFull(Writer $writer);
 
     /**
      * Returns a unique id for this notification
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Notification/SystemStatus.php b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/SystemStatus.php
index 608892dab..d41702e07 100644
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Notifications/Notification/SystemStatus.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/SystemStatus.php
@@ -1,9 +1,9 @@
 <?php
 
-namespace Sabre\CalDAV\Notifications\Notification;
+namespace Sabre\CalDAV\Xml\Notification;
 
-use Sabre\DAV;
-use Sabre\CalDAV;
+use Sabre\Xml\Writer;
+use Sabre\CalDAV\Plugin;
 
 /**
  * SystemStatus notification
@@ -11,11 +11,11 @@ use Sabre\CalDAV;
  * This notification can be used to indicate to the user that the system is
  * down.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SystemStatus extends DAV\Property implements CalDAV\Notifications\INotificationType {
+class SystemStatus implements NotificationInterface {
 
     const TYPE_LOW = 1;
     const TYPE_MEDIUM = 2;
@@ -68,7 +68,7 @@ class SystemStatus extends DAV\Property implements CalDAV\Notifications\INotific
      * @param string $description
      * @param string $href
      */
-    public function __construct($id, $etag, $type = self::TYPE_HIGH, $description = null, $href = null) {
+    function __construct($id, $etag, $type = self::TYPE_HIGH, $description = null, $href = null) {
 
         $this->id = $id;
         $this->type = $type;
@@ -79,18 +79,23 @@ class SystemStatus extends DAV\Property implements CalDAV\Notifications\INotific
     }
 
     /**
-     * Serializes the notification as a single property.
+     * The serialize method is called during xml writing.
      *
-     * You should usually just encode the single top-level element of the
-     * notification.
+     * It should use the $writer argument to encode this object into XML.
      *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
+     * Important note: it is not needed to create the parent element. The
+     * parent element is already created, and we only have to worry about
+     * attributes, child elements and text (if any).
+     *
+     * Important note 2: If you are writing any new elements, you are also
+     * responsible for closing them.
+     *
+     * @param Writer $writer
      * @return void
      */
-    public function serialize(DAV\Server $server, \DOMElement $node) {
+    function xmlSerialize(Writer $writer) {
 
-        switch($this->type) {
+        switch ($this->type) {
             case self::TYPE_LOW :
                 $type = 'low';
                 break;
@@ -103,10 +108,9 @@ class SystemStatus extends DAV\Property implements CalDAV\Notifications\INotific
                 break;
         }
 
-        $prop = $node->ownerDocument->createElement('cs:systemstatus');
-        $prop->setAttribute('type', $type);
-
-        $node->appendChild($prop);
+        $writer->startElement('{' . Plugin::NS_CALENDARSERVER . '}systemstatus');
+        $writer->writeAttribute('type', $type);
+        $writer->endElement();
 
     }
 
@@ -114,13 +118,13 @@ class SystemStatus extends DAV\Property implements CalDAV\Notifications\INotific
      * This method serializes the entire notification, as it is used in the
      * response body.
      *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
+     * @param Writer $writer
      * @return void
      */
-    public function serializeBody(DAV\Server $server, \DOMElement $node) {
+    function xmlSerializeFull(Writer $writer) {
 
-        switch($this->type) {
+        $cs = '{' . Plugin::NS_CALENDARSERVER . '}';
+        switch ($this->type) {
             case self::TYPE_LOW :
                 $type = 'low';
                 break;
@@ -133,23 +137,18 @@ class SystemStatus extends DAV\Property implements CalDAV\Notifications\INotific
                 break;
         }
 
-        $prop = $node->ownerDocument->createElement('cs:systemstatus');
-        $prop->setAttribute('type', $type);
+        $writer->startElement($cs . 'systemstatus');
+        $writer->writeAttribute('type', $type);
+
 
         if ($this->description) {
-            $text = $node->ownerDocument->createTextNode($this->description);
-            $desc = $node->ownerDocument->createElement('cs:description');
-            $desc->appendChild($text);
-            $prop->appendChild($desc);
+            $writer->writeElement($cs . 'description', $this->description);
         }
         if ($this->href) {
-            $text = $node->ownerDocument->createTextNode($this->href);
-            $href = $node->ownerDocument->createElement('d:href');
-            $href->appendChild($text);
-            $prop->appendChild($href);
+            $writer->writeElement('{DAV:}href', $this->href);
         }
 
-        $node->appendChild($prop);
+        $writer->endElement(); // systemstatus
 
     }
 
@@ -161,7 +160,7 @@ class SystemStatus extends DAV\Property implements CalDAV\Notifications\INotific
      *
      * @return string
      */
-    public function getId() {
+    function getId() {
 
         return $this->id;
 
@@ -174,9 +173,10 @@ class SystemStatus extends DAV\Property implements CalDAV\Notifications\INotific
      *
      * @return string
      */
-    public function getETag() {
+    function getETag() {
 
         return $this->etag;
 
     }
+
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/AllowedSharingModes.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/AllowedSharingModes.php
new file mode 100644
index 000000000..c2a2d565e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/AllowedSharingModes.php
@@ -0,0 +1,87 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\XmlSerializable;
+use Sabre\Xml\Writer;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * AllowedSharingModes
+ *
+ * This property encodes the 'allowed-sharing-modes' property, as defined by
+ * the 'caldav-sharing-02' spec, in the http://calendarserver.org/ns/
+ * namespace.
+ *
+ * This property is a representation of the supported-calendar_component-set
+ * property in the CalDAV namespace. It simply requires an array of components,
+ * such as VEVENT, VTODO
+ *
+ * @see https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/caldav-sharing-02.txt
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class AllowedSharingModes implements XmlSerializable {
+
+    /**
+     * Whether or not a calendar can be shared with another user
+     *
+     * @var bool
+     */
+    protected $canBeShared;
+
+    /**
+     * Whether or not the calendar can be placed on a public url.
+     *
+     * @var bool
+     */
+    protected $canBePublished;
+
+    /**
+     * Constructor
+     *
+     * @param bool $canBeShared
+     * @param bool $canBePublished
+     * @return void
+     */
+    function __construct($canBeShared, $canBePublished) {
+
+        $this->canBeShared = $canBeShared;
+        $this->canBePublished = $canBePublished;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        if ($this->canBeShared) {
+            $writer->writeElement('{' . Plugin::NS_CALENDARSERVER . '}can-be-shared');
+        }
+        if ($this->canBePublished) {
+            $writer->writeElement('{' . Plugin::NS_CALENDARSERVER . '}can-be-published');
+        }
+
+    }
+
+
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/EmailAddressSet.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/EmailAddressSet.php
new file mode 100644
index 000000000..f577a9919
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/EmailAddressSet.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+
+/**
+ * email-address-set property
+ *
+ * This property represents the email-address-set property in the
+ * http://calendarserver.org/ns/ namespace.
+ *
+ * It's a list of email addresses associated with a user.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class EmailAddressSet implements XmlSerializable {
+
+    /**
+     * emails
+     *
+     * @var array
+     */
+    private $emails;
+
+    /**
+     * __construct
+     *
+     * @param array $emails
+     */
+    function __construct(array $emails) {
+
+        $this->emails = $emails;
+
+    }
+
+    /**
+     * Returns the email addresses
+     *
+     * @return array
+     */
+    function getValue() {
+
+        return $this->emails;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->emails as $email) {
+
+            $writer->writeElement('{http://calendarserver.org/ns/}email-address', $email);
+
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php
new file mode 100644
index 000000000..3ee053214
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php
@@ -0,0 +1,252 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+use Sabre\CalDAV\Plugin;
+use Sabre\CalDAV\SharingPlugin;
+
+/**
+ * Invite property
+ *
+ * This property encodes the 'invite' property, as defined by
+ * the 'caldav-sharing-02' spec, in the http://calendarserver.org/ns/
+ * namespace.
+ *
+ * @see https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/caldav-sharing-02.txt
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Invite implements Element {
+
+    /**
+     * The list of users a calendar has been shared to.
+     *
+     * @var array
+     */
+    protected $users;
+
+    /**
+     * The organizer contains information about the person who shared the
+     * object.
+     *
+     * @var array
+     */
+    protected $organizer;
+
+    /**
+     * Creates the property.
+     *
+     * Users is an array. Each element of the array has the following
+     * properties:
+     *
+     *   * href - Often a mailto: address
+     *   * commonName - Optional, for example a first and lastname for a user.
+     *   * status - One of the SharingPlugin::STATUS_* constants.
+     *   * readOnly - true or false
+     *   * summary - Optional, description of the share
+     *
+     * The organizer key is optional to specify. It's only useful when a
+     * 'sharee' requests the sharing information.
+     *
+     * The organizer may have the following properties:
+     *   * href - Often a mailto: address.
+     *   * commonName - Optional human-readable name.
+     *   * firstName - Optional first name.
+     *   * lastName - Optional last name.
+     *
+     * If you wonder why these two structures are so different, I guess a
+     * valid answer is that the current spec is still a draft.
+     *
+     * @param array $users
+     */
+    function __construct(array $users, array $organizer = null) {
+
+        $this->users = $users;
+        $this->organizer = $organizer;
+
+    }
+
+    /**
+     * Returns the list of users, as it was passed to the constructor.
+     *
+     * @return array
+     */
+    function getValue() {
+
+        return $this->users;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $cs = '{' . Plugin::NS_CALENDARSERVER . '}';
+
+        if (!is_null($this->organizer)) {
+
+            $writer->startElement($cs . 'organizer');
+            $writer->writeElement('{DAV:}href', $this->organizer['href']);
+
+            if (isset($this->organizer['commonName']) && $this->organizer['commonName']) {
+                $writer->writeElement($cs . 'common-name', $this->organizer['commonName']);
+            }
+            if (isset($this->organizer['firstName']) && $this->organizer['firstName']) {
+                $writer->writeElement($cs . 'first-name', $this->organizer['firstName']);
+            }
+            if (isset($this->organizer['lastName']) && $this->organizer['lastName']) {
+                $writer->writeElement($cs . 'last-name', $this->organizer['lastName']);
+            }
+            $writer->endElement(); // organizer
+
+        }
+
+        foreach ($this->users as $user) {
+
+            $writer->startElement($cs . 'user');
+            $writer->writeElement('{DAV:}href', $user['href']);
+            if (isset($user['commonName']) && $user['commonName']) {
+                $writer->writeElement($cs . 'common-name', $user['commonName']);
+            }
+            switch ($user['status']) {
+
+                case SharingPlugin::STATUS_ACCEPTED :
+                    $writer->writeElement($cs . 'invite-accepted');
+                    break;
+                case SharingPlugin::STATUS_DECLINED :
+                    $writer->writeElement($cs . 'invite-declined');
+                    break;
+                case SharingPlugin::STATUS_NORESPONSE :
+                    $writer->writeElement($cs . 'invite-noresponse');
+                    break;
+                case SharingPlugin::STATUS_INVALID :
+                    $writer->writeElement($cs . 'invite-invalid');
+                    break;
+            }
+
+            $writer->startElement($cs . 'access');
+            if ($user['readOnly']) {
+                $writer->writeElement($cs . 'read');
+            } else {
+                $writer->writeElement($cs . 'read-write');
+            }
+            $writer->endElement(); // access
+
+            if (isset($user['summary']) && $user['summary']) {
+                $writer->writeElement($cs . 'summary', $user['summary']);
+            }
+
+            $writer->endElement(); //user
+
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $cs = '{' . Plugin::NS_CALENDARSERVER . '}';
+
+        $users = [];
+
+        foreach ($reader->parseInnerTree() as $elem) {
+
+            if ($elem['name'] !== $cs . 'user')
+                continue;
+
+            $user = [
+                'href'       => null,
+                'commonName' => null,
+                'readOnly'   => null,
+                'summary'    => null,
+                'status'     => null,
+            ];
+
+            foreach ($elem['value'] as $userElem) {
+
+                switch ($userElem['name']) {
+                    case $cs . 'invite-accepted' :
+                        $user['status'] = SharingPlugin::STATUS_ACCEPTED;
+                        break;
+                    case $cs . 'invite-declined' :
+                        $user['status'] = SharingPlugin::STATUS_DECLINED;
+                        break;
+                    case $cs . 'invite-noresponse' :
+                        $user['status'] = SharingPlugin::STATUS_NORESPONSE;
+                        break;
+                    case $cs . 'invite-invalid' :
+                        $user['status'] = SharingPlugin::STATUS_INVALID;
+                        break;
+                    case '{DAV:}href' :
+                        $user['href'] = $userElem['value'];
+                        break;
+                    case $cs . 'common-name' :
+                        $user['commonName'] = $userElem['value'];
+                        break;
+                    case $cs . 'access' :
+                        foreach ($userElem['value'] as $accessHref) {
+                            if ($accessHref['name'] === $cs . 'read') {
+                                $user['readOnly'] = true;
+                            }
+                        }
+                        break;
+                    case $cs . 'summary' :
+                        $user['summary'] = $userElem['value'];
+                        break;
+
+                }
+
+            }
+            if (!$user['status']) {
+                throw new \InvalidArgumentException('Every user must have one of cs:invite-accepted, cs:invite-declined, cs:invite-noresponse or cs:invite-invalid');
+            }
+
+            $users[] = $user;
+
+        }
+
+        return new self($users);
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php
new file mode 100644
index 000000000..4a253e008
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php
@@ -0,0 +1,140 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+use Sabre\Xml\Element\Elements;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * schedule-calendar-transp property.
+ *
+ * This property is a representation of the schedule-calendar-transp property.
+ * This property is defined in:
+ *
+ * http://tools.ietf.org/html/rfc6638#section-9.1
+ *
+ * Its values are either 'transparent' or 'opaque'. If it's transparent, it
+ * means that this calendar will not be taken into consideration when a
+ * different user queries for free-busy information. If it's 'opaque', it will.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class ScheduleCalendarTransp implements Element {
+
+    const TRANSPARENT = 'transparent';
+    const OPAQUE = 'opaque';
+
+    /**
+     * value
+     *
+     * @var string
+     */
+    protected $value;
+
+    /**
+     * Creates the property
+     *
+     * @param string $value
+     */
+    function __construct($value) {
+
+        if ($value !== self::TRANSPARENT && $value !== self::OPAQUE) {
+            throw new \InvalidArgumentException('The value must either be specified as "transparent" or "opaque"');
+        }
+        $this->value = $value;
+
+    }
+
+    /**
+     * Returns the current value
+     *
+     * @return string
+     */
+    function getValue() {
+
+        return $this->value;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        switch ($this->value) {
+            case self::TRANSPARENT :
+                $writer->writeElement('{' . Plugin::NS_CALDAV . '}transparent');
+                break;
+            case self::OPAQUE :
+                $writer->writeElement('{' . Plugin::NS_CALDAV . '}opaque');
+                break;
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = Elements::xmlDeserialize($reader);
+
+        $value = null;
+
+        foreach ($elems as $elem) {
+            switch ($elem) {
+                case '{' . Plugin::NS_CALDAV . '}opaque' :
+                    $value = self::OPAQUE;
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}transparent' :
+                    $value = self::TRANSPARENT;
+                    break;
+            }
+        }
+        if (is_null($value))
+           return null;
+
+        return new self($value);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarComponentSet.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarComponentSet.php
new file mode 100644
index 000000000..7a26e767e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarComponentSet.php
@@ -0,0 +1,129 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\ParseException;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * SupportedCalendarComponentSet property.
+ *
+ * This class represents the
+ * {urn:ietf:params:xml:ns:caldav}supported-calendar-component-set property, as
+ * defined in:
+ *
+ * https://tools.ietf.org/html/rfc4791#section-5.2.3
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedCalendarComponentSet implements Element {
+
+    /**
+     * List of supported components.
+     *
+     * This array will contain values such as VEVENT, VTODO and VJOURNAL.
+     *
+     * @var array
+     */
+    protected $components = [];
+
+    /**
+     * Creates the property.
+     *
+     * @param array $components
+     */
+    function __construct(array $components) {
+
+        $this->components = $components;
+
+    }
+
+    /**
+     * Returns the list of supported components
+     *
+     * @return array
+     */
+    function getValue() {
+
+        return $this->components;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->components as $component) {
+
+            $writer->startElement('{' . Plugin::NS_CALDAV . '}comp');
+            $writer->writeAttributes(['name' => $component]);
+            $writer->endElement();
+
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = $reader->parseInnerTree();
+
+        $components = [];
+
+        foreach ((array)$elems as $elem) {
+            if ($elem['name'] === '{' . Plugin::NS_CALDAV . '}comp') {
+                $components[] = $elem['attributes']['name'];
+            }
+        }
+
+        if (!$components) {
+            throw new ParseException('supported-calendar-component-set must have at least one CALDAV:comp element');
+        }
+
+        return new self($components);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarData.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarData.php
new file mode 100644
index 000000000..b0c407fd6
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarData.php
@@ -0,0 +1,60 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\XmlSerializable;
+use Sabre\Xml\Writer;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * Supported-calendar-data property
+ *
+ * This property is a representation of the supported-calendar-data property
+ * in the CalDAV namespace. SabreDAV only has support for text/calendar;2.0
+ * so the value is currently hardcoded.
+ *
+ * This property is defined in:
+ * http://tools.ietf.org/html/rfc4791#section-5.2.4
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedCalendarData implements XmlSerializable {
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $writer->startElement('{' . Plugin::NS_CALDAV . '}calendar-data');
+        $writer->writeAttributes([
+            'content-type' => 'text/calendar',
+            'version'      => '2.0',
+        ]);
+        $writer->endElement(); // calendar-data
+        $writer->startElement('{' . Plugin::NS_CALDAV . '}calendar-data');
+        $writer->writeAttributes([
+            'content-type' => 'application/calendar+json',
+        ]);
+        $writer->endElement(); // calendar-data
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCollationSet.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCollationSet.php
new file mode 100644
index 000000000..71de25a62
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCollationSet.php
@@ -0,0 +1,57 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Property;
+
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * supported-collation-set property
+ *
+ * This property is a representation of the supported-collation-set property
+ * in the CalDAV namespace.
+ *
+ * This property is defined in:
+ * http://tools.ietf.org/html/rfc4791#section-7.5.1
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedCollationSet implements XmlSerializable {
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $collations = [
+            'i;ascii-casemap',
+            'i;octet',
+            'i;unicode-casemap'
+        ];
+
+        foreach ($collations as $collation) {
+            $writer->writeElement('{' . Plugin::NS_CALDAV . '}supported-collation', $collation);
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarMultiGetReport.php b/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarMultiGetReport.php
new file mode 100644
index 000000000..79b3bb3ac
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarMultiGetReport.php
@@ -0,0 +1,124 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Request;
+
+use Sabre\Xml\XmlDeserializable;
+use Sabre\Xml\Reader;
+use Sabre\CalDAV\Plugin;
+use Sabre\Uri;
+
+/**
+ * CalendarMultiGetReport request parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:caldav}calendar-multiget
+ * REPORT, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4791#section-7.9
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class CalendarMultiGetReport implements XmlDeserializable {
+
+    /**
+     * An array with requested properties.
+     *
+     * @var array
+     */
+    public $properties;
+
+    /**
+     * This is an array with the urls that are being requested.
+     *
+     * @var array
+     */
+    public $hrefs;
+
+    /**
+     * If the calendar data must be expanded, this will contain an array with 2
+     * elements: start and end.
+     *
+     * Each may be a DateTime or null.
+     *
+     * @var array|null
+     */
+    public $expand = null;
+
+    /**
+     * The mimetype of the content that should be returend. Usually
+     * text/calendar.
+     *
+     * @var string
+     */
+    public $contentType = null;
+
+    /**
+     * The version of calendar-data that should be returned. Usually '2.0',
+     * referring to iCalendar 2.0.
+     *
+     * @var string
+     */
+    public $version = null;
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = $reader->parseInnerTree([
+            '{urn:ietf:params:xml:ns:caldav}calendar-data' => 'Sabre\\CalDAV\\Xml\\Filter\\CalendarData',
+            '{DAV:}prop'                                   => 'Sabre\\Xml\\Element\\KeyValue',
+        ]);
+
+        $newProps = [
+            'hrefs'      => [],
+            'properties' => [],
+        ];
+
+        foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{DAV:}prop' :
+                    $newProps['properties'] = array_keys($elem['value']);
+                    if (isset($elem['value']['{' . Plugin::NS_CALDAV . '}calendar-data'])) {
+                        $newProps += $elem['value']['{' . Plugin::NS_CALDAV . '}calendar-data'];
+                    }
+                    break;
+                case '{DAV:}href' :
+                    $newProps['hrefs'][] = Uri\resolve($reader->contextUri, $elem['value']);
+                    break;
+
+            }
+
+        }
+
+        $obj = new self();
+        foreach ($newProps as $key => $value) {
+            $obj->$key = $value;
+        }
+
+        return $obj;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarQueryReport.php b/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarQueryReport.php
new file mode 100644
index 000000000..848a4dc46
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarQueryReport.php
@@ -0,0 +1,139 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Request;
+
+use Sabre\Xml\XmlDeserializable;
+use Sabre\Xml\Reader;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * CalendarQueryReport request parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:caldav}calendar-query
+ * REPORT, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4791#section-7.9
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class CalendarQueryReport implements XmlDeserializable {
+
+    /**
+     * An array with requested properties.
+     *
+     * @var array
+     */
+    public $properties;
+
+    /**
+     * List of property/component filters.
+     *
+     * @var array
+     */
+    public $filters;
+
+    /**
+     * If the calendar data must be expanded, this will contain an array with 2
+     * elements: start and end.
+     *
+     * Each may be a DateTime or null.
+     *
+     * @var array|null
+     */
+    public $expand = null;
+
+    /**
+     * The mimetype of the content that should be returend. Usually
+     * text/calendar.
+     *
+     * @var string
+     */
+    public $contentType = null;
+
+    /**
+     * The version of calendar-data that should be returned. Usually '2.0',
+     * referring to iCalendar 2.0.
+     *
+     * @var string
+     */
+    public $version = null;
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = $reader->parseInnerTree([
+            '{urn:ietf:params:xml:ns:caldav}comp-filter'   => 'Sabre\\CalDAV\\Xml\\Filter\\CompFilter',
+            '{urn:ietf:params:xml:ns:caldav}prop-filter'   => 'Sabre\\CalDAV\\Xml\\Filter\\PropFilter',
+            '{urn:ietf:params:xml:ns:caldav}param-filter'  => 'Sabre\\CalDAV\\Xml\\Filter\\ParamFilter',
+            '{urn:ietf:params:xml:ns:caldav}calendar-data' => 'Sabre\\CalDAV\\Xml\\Filter\\CalendarData',
+            '{DAV:}prop'                                   => 'Sabre\\Xml\\Element\\KeyValue',
+        ]);
+
+        $newProps = [
+            'filters'    => null,
+            'properties' => [],
+        ];
+
+        if (!is_array($elems)) $elems = [];
+
+        foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{DAV:}prop' :
+                    $newProps['properties'] = array_keys($elem['value']);
+                    if (isset($elem['value']['{' . Plugin::NS_CALDAV . '}calendar-data'])) {
+                        $newProps += $elem['value']['{' . Plugin::NS_CALDAV . '}calendar-data'];
+                    }
+                    break;
+                case '{' . Plugin::NS_CALDAV . '}filter' :
+                    foreach ($elem['value'] as $subElem) {
+                        if ($subElem['name'] === '{' . Plugin::NS_CALDAV . '}comp-filter') {
+                            if (!is_null($newProps['filters'])) {
+                                throw new BadRequest('Only one top-level comp-filter may be defined');
+                            }
+                            $newProps['filters'] = $subElem['value'];
+                        }
+                    }
+                    break;
+
+            }
+
+        }
+
+        if (is_null($newProps['filters'])) {
+            throw new BadRequest('The {' . Plugin::NS_CALDAV . '}filter element is required for this request');
+        }
+
+        $obj = new self();
+        foreach ($newProps as $key => $value) {
+            $obj->$key = $value;
+        }
+        return $obj;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Request/FreeBusyQueryReport.php b/vendor/sabre/dav/lib/CalDAV/Xml/Request/FreeBusyQueryReport.php
new file mode 100644
index 000000000..e3b27d08e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/FreeBusyQueryReport.php
@@ -0,0 +1,91 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Request;
+
+use Sabre\CalDAV\Plugin;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\VObject\DateTimeParser;
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+
+/**
+ * FreeBusyQueryReport
+ *
+ * This class parses the {DAV:}free-busy-query REPORT, as defined in:
+ *
+ * http://tools.ietf.org/html/rfc3253#section-3.8
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class FreeBusyQueryReport implements XmlDeserializable {
+
+    /**
+     * Starttime of report
+     *
+     * @var DateTime|null
+     */
+    public $start;
+
+    /**
+     * End time of report
+     *
+     * @var DateTime|null
+     */
+    public $end;
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $timeRange = '{' . Plugin::NS_CALDAV . '}time-range';
+
+        $start = null;
+        $end = null;
+
+        foreach ((array)$reader->parseInnerTree([]) as $elem) {
+
+            if ($elem['name'] !== $timeRange) continue;
+
+            $start = empty($elem['attributes']['start']) ?: $elem['attributes']['start'];
+            $end = empty($elem['attributes']['end']) ?: $elem['attributes']['end'];
+
+        }
+        if (!$start && !$end) {
+            throw new BadRequest('The freebusy report must have a time-range element');
+        }
+        if ($start) {
+            $start = DateTimeParser::parseDateTime($start);
+        }
+        if ($end) {
+            $end = DateTimeParser::parseDateTime($end);
+        }
+        $result = new self();
+        $result->start = $start;
+        $result->end = $end;
+
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Request/InviteReply.php b/vendor/sabre/dav/lib/CalDAV/Xml/Request/InviteReply.php
new file mode 100644
index 000000000..ec627156f
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/InviteReply.php
@@ -0,0 +1,149 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Request;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\Xml\Element\KeyValue;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\CalDAV\Plugin;
+use Sabre\CalDAV\SharingPlugin;
+
+/**
+ * Invite-reply POST request parser
+ *
+ * This class parses the invite-reply POST request, as defined in:
+ *
+ * http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-sharing.txt
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class InviteReply implements XmlDeserializable {
+
+    /**
+     * The sharee calendar user address.
+     *
+     * This is the address that the original invite was set to
+     *
+     * @var string
+     */
+    public $href;
+
+    /**
+     * The uri to the calendar that was being shared.
+     *
+     * @var string
+     */
+    public $calendarUri;
+
+    /**
+     * The id of the invite message that's being responded to
+     *
+     * @var string
+     */
+    public $inReplyTo;
+
+    /**
+     * An optional message
+     *
+     * @var string
+     */
+    public $summary;
+
+    /**
+     * Either SharingPlugin::STATUS_ACCEPTED or SharingPlugin::STATUS_DECLINED.
+     *
+     * @var int
+     */
+    public $status;
+
+    /**
+     * Constructor
+     *
+     * @param string $href
+     * @param string $calendarUri
+     * @param string $inReplyTo
+     * @param string $summary
+     * @param int $status
+     */
+    function __construct($href, $calendarUri, $inReplyTo, $summary, $status) {
+
+        $this->href = $href;
+        $this->calendarUri = $calendarUri;
+        $this->inReplyTo = $inReplyTo;
+        $this->summary = $summary;
+        $this->status = $status;
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = KeyValue::xmlDeserialize($reader);
+
+        $href = null;
+        $calendarUri = null;
+        $inReplyTo = null;
+        $summary = null;
+        $status = null;
+
+        foreach ($elems as $name => $value) {
+
+            switch ($name) {
+
+                case '{' . Plugin::NS_CALENDARSERVER . '}hosturl' :
+                    foreach ($value as $bla) {
+                        if ($bla['name'] === '{DAV:}href') {
+                            $calendarUri = $bla['value'];
+                        }
+                    }
+                    break;
+                case '{' . Plugin::NS_CALENDARSERVER . '}invite-accepted' :
+                    $status = SharingPlugin::STATUS_ACCEPTED;
+                    break;
+                case '{' . Plugin::NS_CALENDARSERVER . '}invite-declined' :
+                    $status = SharingPlugin::STATUS_DECLINED;
+                    break;
+                case '{' . Plugin::NS_CALENDARSERVER . '}in-reply-to' :
+                    $inReplyTo = $value;
+                    break;
+                case '{' . Plugin::NS_CALENDARSERVER . '}summary' :
+                    $summary = $value;
+                    break;
+                case '{DAV:}href' :
+                    $href = $value;
+                    break;
+            }
+
+        }
+        if (is_null($calendarUri)) {
+            throw new BadRequest('The {http://calendarserver.org/ns/}hosturl/{DAV:}href element must exist');
+        }
+
+        return new self($href, $calendarUri, $inReplyTo, $summary, $status);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Request/MkCalendar.php b/vendor/sabre/dav/lib/CalDAV/Xml/Request/MkCalendar.php
new file mode 100644
index 000000000..7b745db55
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/MkCalendar.php
@@ -0,0 +1,79 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Request;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+
+/**
+ * MKCALENDAR parser.
+ *
+ * This class parses the MKCALENDAR request, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4791#section-5.3.1
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class MkCalendar implements XmlDeserializable {
+
+    /**
+     * The list of properties that will be set.
+     *
+     * @var array
+     */
+    public $properties = [];
+
+    /**
+     * Returns the list of properties the calendar will be initialized with.
+     *
+     * @return array
+     */
+    function getProperties() {
+
+        return $this->properties;
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $self = new self();
+
+        $elementMap = $reader->elementMap;
+        $elementMap['{DAV:}prop']   = 'Sabre\DAV\Xml\Element\Prop';
+        $elementMap['{DAV:}set']    = 'Sabre\Xml\Element\KeyValue';
+        $elems = $reader->parseInnerTree($elementMap);
+
+        foreach ($elems as $elem) {
+            if ($elem['name'] === '{DAV:}set') {
+                $self->properties = array_merge($self->properties, $elem['value']['{DAV:}prop']);
+            }
+        }
+
+        return $self;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Request/Share.php b/vendor/sabre/dav/lib/CalDAV/Xml/Request/Share.php
new file mode 100644
index 000000000..dacc5dc94
--- /dev/null
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/Share.php
@@ -0,0 +1,116 @@
+<?php
+
+namespace Sabre\CalDAV\Xml\Request;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\CalDAV\Plugin;
+
+/**
+ * Share POST request parser
+ *
+ * This class parses the share POST request, as defined in:
+ *
+ * http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-sharing.txt
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Share implements XmlDeserializable {
+
+    /**
+     * The list of new people added or updated.
+     *
+     * Every element has the following keys:
+     * 1. href - An email address
+     * 2. commonName - Some name
+     * 3. summary - An optional description of the share
+     * 4. readOnly - true or false
+     *
+     * @var array
+     */
+    public $set = [];
+
+    /**
+     * List of people removed from the share list.
+     *
+     * The list is a flat list of email addresses (including mailto:).
+     *
+     * @var array
+     */
+    public $remove = [];
+
+    /**
+     * Constructor
+     *
+     * @param array $set
+     * @param array $remove
+     */
+    function __construct(array $set, array $remove) {
+
+        $this->set = $set;
+        $this->remove = $remove;
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = $reader->parseInnerTree([
+            '{' . Plugin::NS_CALENDARSERVER . '}set'    => 'Sabre\\Xml\\Element\\KeyValue',
+            '{' . Plugin::NS_CALENDARSERVER . '}remove' => 'Sabre\\Xml\\Element\\KeyValue',
+        ]);
+
+        $set = [];
+        $remove = [];
+
+        foreach ($elems as $elem) {
+            switch ($elem['name']) {
+
+                case '{' . Plugin::NS_CALENDARSERVER . '}set' :
+                    $sharee = $elem['value'];
+
+                    $sumElem = '{' . Plugin::NS_CALENDARSERVER . '}summary';
+                    $commonName = '{' . Plugin::NS_CALENDARSERVER . '}common-name';
+
+                    $set[] = [
+                        'href'       => $sharee['{DAV:}href'],
+                        'commonName' => isset($sharee[$commonName]) ? $sharee[$commonName] : null,
+                        'summary'    => isset($sharee[$sumElem]) ? $sharee[$sumElem] : null,
+                        'readOnly'   => !array_key_exists('{' . Plugin::NS_CALENDARSERVER . '}read-write', $sharee),
+                    ];
+                    break;
+
+                case '{' . Plugin::NS_CALENDARSERVER . '}remove' :
+                    $remove[] = $elem['value']['{DAV:}href'];
+                    break;
+
+            }
+        }
+
+        return new self($set, $remove);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/AddressBook.php b/vendor/sabre/dav/lib/CardDAV/AddressBook.php
new file mode 100644
index 000000000..70bec8760
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/AddressBook.php
@@ -0,0 +1,433 @@
+<?php
+
+namespace Sabre\CardDAV;
+
+use Sabre\DAV;
+use Sabre\DAVACL;
+
+/**
+ * The AddressBook class represents a CardDAV addressbook, owned by a specific user
+ *
+ * The AddressBook can contain multiple vcards
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class AddressBook extends DAV\Collection implements IAddressBook, DAV\IProperties, DAVACL\IACL, DAV\Sync\ISyncCollection, DAV\IMultiGet {
+
+    /**
+     * This is an array with addressbook information
+     *
+     * @var array
+     */
+    protected $addressBookInfo;
+
+    /**
+     * CardDAV backend
+     *
+     * @var Backend\BackendInterface
+     */
+    protected $carddavBackend;
+
+    /**
+     * Constructor
+     *
+     * @param Backend\BackendInterface $carddavBackend
+     * @param array $addressBookInfo
+     */
+    function __construct(Backend\BackendInterface $carddavBackend, array $addressBookInfo) {
+
+        $this->carddavBackend = $carddavBackend;
+        $this->addressBookInfo = $addressBookInfo;
+
+    }
+
+    /**
+     * Returns the name of the addressbook
+     *
+     * @return string
+     */
+    function getName() {
+
+        return $this->addressBookInfo['uri'];
+
+    }
+
+    /**
+     * Returns a card
+     *
+     * @param string $name
+     * @return \ICard
+     */
+    function getChild($name) {
+
+        $obj = $this->carddavBackend->getCard($this->addressBookInfo['id'], $name);
+        if (!$obj) throw new DAV\Exception\NotFound('Card not found');
+        return new Card($this->carddavBackend, $this->addressBookInfo, $obj);
+
+    }
+
+    /**
+     * Returns the full list of cards
+     *
+     * @return array
+     */
+    function getChildren() {
+
+        $objs = $this->carddavBackend->getCards($this->addressBookInfo['id']);
+        $children = [];
+        foreach ($objs as $obj) {
+            $obj['acl'] = $this->getChildACL();
+            $children[] = new Card($this->carddavBackend, $this->addressBookInfo, $obj);
+        }
+        return $children;
+
+    }
+
+    /**
+     * This method receives a list of paths in it's first argument.
+     * It must return an array with Node objects.
+     *
+     * If any children are not found, you do not have to return them.
+     *
+     * @param string[] $paths
+     * @return array
+     */
+    function getMultipleChildren(array $paths) {
+
+        $objs = $this->carddavBackend->getMultipleCards($this->addressBookInfo['id'], $paths);
+        $children = [];
+        foreach ($objs as $obj) {
+            $obj['acl'] = $this->getChildACL();
+            $children[] = new Card($this->carddavBackend, $this->addressBookInfo, $obj);
+        }
+        return $children;
+
+    }
+
+    /**
+     * Creates a new directory
+     *
+     * We actually block this, as subdirectories are not allowed in addressbooks.
+     *
+     * @param string $name
+     * @return void
+     */
+    function createDirectory($name) {
+
+        throw new DAV\Exception\MethodNotAllowed('Creating collections in addressbooks is not allowed');
+
+    }
+
+    /**
+     * Creates a new file
+     *
+     * The contents of the new file must be a valid VCARD.
+     *
+     * This method may return an ETag.
+     *
+     * @param string $name
+     * @param resource $vcardData
+     * @return string|null
+     */
+    function createFile($name, $vcardData = null) {
+
+        if (is_resource($vcardData)) {
+            $vcardData = stream_get_contents($vcardData);
+        }
+        // Converting to UTF-8, if needed
+        $vcardData = DAV\StringUtil::ensureUTF8($vcardData);
+
+        return $this->carddavBackend->createCard($this->addressBookInfo['id'], $name, $vcardData);
+
+    }
+
+    /**
+     * Deletes the entire addressbook.
+     *
+     * @return void
+     */
+    function delete() {
+
+        $this->carddavBackend->deleteAddressBook($this->addressBookInfo['id']);
+
+    }
+
+    /**
+     * Renames the addressbook
+     *
+     * @param string $newName
+     * @return void
+     */
+    function setName($newName) {
+
+        throw new DAV\Exception\MethodNotAllowed('Renaming addressbooks is not yet supported');
+
+    }
+
+    /**
+     * Returns the last modification date as a unix timestamp.
+     *
+     * @return void
+     */
+    function getLastModified() {
+
+        return null;
+
+    }
+
+    /**
+     * Updates properties on this node.
+     *
+     * This method received a PropPatch object, which contains all the
+     * information about the update.
+     *
+     * To update specific properties, call the 'handle' method on this object.
+     * Read the PropPatch documentation for more information.
+     *
+     * @param DAV\PropPatch $propPatch
+     * @return void
+     */
+    function propPatch(DAV\PropPatch $propPatch) {
+
+        return $this->carddavBackend->updateAddressBook($this->addressBookInfo['id'], $propPatch);
+
+    }
+
+    /**
+     * Returns a list of properties for this nodes.
+     *
+     * The properties list is a list of propertynames the client requested,
+     * encoded in clark-notation {xmlnamespace}tagname
+     *
+     * If the array is empty, it means 'all properties' were requested.
+     *
+     * @param array $properties
+     * @return array
+     */
+    function getProperties($properties) {
+
+        $response = [];
+        foreach ($properties as $propertyName) {
+
+            if (isset($this->addressBookInfo[$propertyName])) {
+
+                $response[$propertyName] = $this->addressBookInfo[$propertyName];
+
+            }
+
+        }
+
+        return $response;
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getOwner() {
+
+        return $this->addressBookInfo['principaluri'];
+
+    }
+
+    /**
+     * Returns a group principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getGroup() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    function getACL() {
+
+        return [
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+
+        ];
+
+    }
+
+    /**
+     * This method returns the ACL's for card nodes in this address book.
+     * The result of this method automatically gets passed to the
+     * card nodes in this address book.
+     *
+     * @return array
+     */
+    function getChildACL() {
+
+        return [
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}write',
+                'principal' => $this->getOwner(),
+                'protected' => true,
+            ],
+        ];
+
+    }
+
+    /**
+     * Updates the ACL
+     *
+     * This method will receive a list of new ACE's.
+     *
+     * @param array $acl
+     * @return void
+     */
+    function setACL(array $acl) {
+
+        throw new DAV\Exception\MethodNotAllowed('Changing ACL is not yet supported');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    function getSupportedPrivilegeSet() {
+
+        return null;
+
+    }
+
+    /**
+     * This method returns the current sync-token for this collection.
+     * This can be any string.
+     *
+     * If null is returned from this function, the plugin assumes there's no
+     * sync information available.
+     *
+     * @return string|null
+     */
+    function getSyncToken() {
+
+        if (
+            $this->carddavBackend instanceof Backend\SyncSupport &&
+            isset($this->addressBookInfo['{DAV:}sync-token'])
+        ) {
+            return $this->addressBookInfo['{DAV:}sync-token'];
+        }
+        if (
+            $this->carddavBackend instanceof Backend\SyncSupport &&
+            isset($this->addressBookInfo['{http://sabredav.org/ns}sync-token'])
+        ) {
+            return $this->addressBookInfo['{http://sabredav.org/ns}sync-token'];
+        }
+
+    }
+
+    /**
+     * The getChanges method returns all the changes that have happened, since
+     * the specified syncToken and the current collection.
+     *
+     * This function should return an array, such as the following:
+     *
+     * [
+     *   'syncToken' => 'The current synctoken',
+     *   'added'   => [
+     *      'new.txt',
+     *   ],
+     *   'modified'   => [
+     *      'modified.txt',
+     *   ],
+     *   'deleted' => [
+     *      'foo.php.bak',
+     *      'old.txt'
+     *   ]
+     * ];
+     *
+     * The syncToken property should reflect the *current* syncToken of the
+     * collection, as reported getSyncToken(). This is needed here too, to
+     * ensure the operation is atomic.
+     *
+     * If the syncToken is specified as null, this is an initial sync, and all
+     * members should be reported.
+     *
+     * The modified property is an array of nodenames that have changed since
+     * the last token.
+     *
+     * The deleted property is an array with nodenames, that have been deleted
+     * from collection.
+     *
+     * The second argument is basically the 'depth' of the report. If it's 1,
+     * you only have to report changes that happened only directly in immediate
+     * descendants. If it's 2, it should also include changes from the nodes
+     * below the child collections. (grandchildren)
+     *
+     * The third (optional) argument allows a client to specify how many
+     * results should be returned at most. If the limit is not specified, it
+     * should be treated as infinite.
+     *
+     * If the limit (infinite or not) is higher than you're willing to return,
+     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     *
+     * If the syncToken is expired (due to data cleanup) or unknown, you must
+     * return null.
+     *
+     * The limit is 'suggestive'. You are free to ignore it.
+     *
+     * @param string $syncToken
+     * @param int $syncLevel
+     * @param int $limit
+     * @return array
+     */
+    function getChanges($syncToken, $syncLevel, $limit = null) {
+
+        if (!$this->carddavBackend instanceof Backend\SyncSupport) {
+            return null;
+        }
+
+        return $this->carddavBackend->getChangesForAddressBook(
+            $this->addressBookInfo['id'],
+            $syncToken,
+            $syncLevel,
+            $limit
+        );
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/UserAddressBooks.php b/vendor/sabre/dav/lib/CardDAV/AddressBookHome.php
index b4af86147..ebc251832 100644
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/UserAddressBooks.php
+++ b/vendor/sabre/dav/lib/CardDAV/AddressBookHome.php
@@ -3,18 +3,20 @@
 namespace Sabre\CardDAV;
 
 use Sabre\DAV;
+use Sabre\DAV\MkCol;
 use Sabre\DAVACL;
+use Sabre\Uri;
 
 /**
- * UserAddressBooks class
+ * AddressBook Home class
  *
- * The UserAddressBooks collection contains a list of addressbooks associated with a user
+ * This collection contains a list of addressbooks associated with one user.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection, DAVACL\IACL {
+class AddressBookHome extends DAV\Collection implements DAV\IExtendedCollection, DAVACL\IACL {
 
     /**
      * Principal uri
@@ -36,7 +38,7 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      * @param Backend\BackendInterface $carddavBackend
      * @param string $principalUri
      */
-    public function __construct(Backend\BackendInterface $carddavBackend, $principalUri) {
+    function __construct(Backend\BackendInterface $carddavBackend, $principalUri) {
 
         $this->carddavBackend = $carddavBackend;
         $this->principalUri = $principalUri;
@@ -48,9 +50,9 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
-        list(,$name) = DAV\URLUtil::splitPath($this->principalUri);
+        list(, $name) = Uri\split($this->principalUri);
         return $name;
 
     }
@@ -61,7 +63,7 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      * @param string $name
      * @return void
      */
-    public function setName($name) {
+    function setName($name) {
 
         throw new DAV\Exception\MethodNotAllowed();
 
@@ -72,7 +74,7 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      *
      * @return void
      */
-    public function delete() {
+    function delete() {
 
         throw new DAV\Exception\MethodNotAllowed();
 
@@ -83,7 +85,7 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      *
      * @return int
      */
-    public function getLastModified() {
+    function getLastModified() {
 
         return null;
 
@@ -98,7 +100,7 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      * @param resource $data
      * @return void
      */
-    public function createFile($filename, $data=null) {
+    function createFile($filename, $data = null) {
 
         throw new DAV\Exception\MethodNotAllowed('Creating new files in this collection is not supported');
 
@@ -112,23 +114,23 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      * @param string $filename
      * @return void
      */
-    public function createDirectory($filename) {
+    function createDirectory($filename) {
 
         throw new DAV\Exception\MethodNotAllowed('Creating new collections in this collection is not supported');
 
     }
 
     /**
-     * Returns a single calendar, by name
+     * Returns a single addressbook, by name
      *
      * @param string $name
      * @todo needs optimizing
      * @return \AddressBook
      */
-    public function getChild($name) {
+    function getChild($name) {
 
-        foreach($this->getChildren() as $child) {
-            if ($name==$child->getName())
+        foreach ($this->getChildren() as $child) {
+            if ($name == $child->getName())
                 return $child;
 
         }
@@ -141,11 +143,11 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      *
      * @return array
      */
-    public function getChildren() {
+    function getChildren() {
 
-        $addressbooks = $this->carddavBackend->getAddressbooksForUser($this->principalUri);
-        $objs = array();
-        foreach($addressbooks as $addressbook) {
+        $addressbooks = $this->carddavBackend->getAddressBooksForUser($this->principalUri);
+        $objs = [];
+        foreach ($addressbooks as $addressbook) {
             $objs[] = new AddressBook($this->carddavBackend, $addressbook);
         }
         return $objs;
@@ -153,18 +155,20 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
     }
 
     /**
-     * Creates a new addressbook
+     * Creates a new address book.
      *
      * @param string $name
-     * @param array $resourceType
-     * @param array $properties
+     * @param MkCol $mkCol
+     * @throws DAV\Exception\InvalidResourceType
      * @return void
      */
-    public function createExtendedCollection($name, array $resourceType, array $properties) {
+    function createExtendedCollection($name, MkCol $mkCol) {
 
-        if (!in_array('{'.Plugin::NS_CARDDAV.'}addressbook',$resourceType) || count($resourceType)!==2) {
+        if (!$mkCol->hasResourceType('{' . Plugin::NS_CARDDAV . '}addressbook')) {
             throw new DAV\Exception\InvalidResourceType('Unknown resourceType for this collection');
         }
+        $properties = $mkCol->getRemainingValues();
+        $mkCol->setRemainingResultCode(201);
         $this->carddavBackend->createAddressBook($this->principalUri, $name, $properties);
 
     }
@@ -176,7 +180,7 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      *
      * @return string|null
      */
-    public function getOwner() {
+    function getOwner() {
 
         return $this->principalUri;
 
@@ -189,7 +193,7 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      *
      * @return string|null
      */
-    public function getGroup() {
+    function getGroup() {
 
         return null;
 
@@ -207,21 +211,20 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
 
-        return array(
-            array(
+        return [
+            [
                 'privilege' => '{DAV:}read',
                 'principal' => $this->principalUri,
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}write',
                 'principal' => $this->principalUri,
                 'protected' => true,
-            ),
-
-        );
+            ],
+        ];
 
     }
 
@@ -233,7 +236,7 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      * @param array $acl
      * @return void
      */
-    public function setACL(array $acl) {
+    function setACL(array $acl) {
 
         throw new DAV\Exception\MethodNotAllowed('Changing ACL is not yet supported');
 
@@ -251,7 +254,7 @@ class UserAddressBooks extends DAV\Collection implements DAV\IExtendedCollection
      *
      * @return array|null
      */
-    public function getSupportedPrivilegeSet() {
+    function getSupportedPrivilegeSet() {
 
         return null;
 
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/AddressBookRoot.php b/vendor/sabre/dav/lib/CardDAV/AddressBookRoot.php
index 789abbc5d..4a33df4ec 100644
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/AddressBookRoot.php
+++ b/vendor/sabre/dav/lib/CardDAV/AddressBookRoot.php
@@ -9,7 +9,7 @@ use Sabre\DAVACL;
  *
  * This object lists a collection of users, which can contain addressbooks.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -43,7 +43,7 @@ class AddressBookRoot extends DAVACL\AbstractPrincipalCollection {
      * @param Backend\BackendInterface $carddavBackend
      * @param string $principalPrefix
      */
-    public function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend,Backend\BackendInterface $carddavBackend, $principalPrefix = 'principals') {
+    function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, Backend\BackendInterface $carddavBackend, $principalPrefix = 'principals') {
 
         $this->carddavBackend = $carddavBackend;
         parent::__construct($principalBackend, $principalPrefix);
@@ -55,7 +55,7 @@ class AddressBookRoot extends DAVACL\AbstractPrincipalCollection {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return Plugin::ADDRESSBOOK_ROOT;
 
@@ -71,9 +71,9 @@ class AddressBookRoot extends DAVACL\AbstractPrincipalCollection {
      * @param array $principal
      * @return \Sabre\DAV\INode
      */
-    public function getChildForPrincipal(array $principal) {
+    function getChildForPrincipal(array $principal) {
 
-        return new UserAddressBooks($this->carddavBackend, $principal['uri']);
+        return new AddressBookHome($this->carddavBackend, $principal['uri']);
 
     }
 
diff --git a/vendor/sabre/dav/lib/CardDAV/Backend/AbstractBackend.php b/vendor/sabre/dav/lib/CardDAV/Backend/AbstractBackend.php
new file mode 100644
index 000000000..03d2346da
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/AbstractBackend.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Sabre\CardDAV\Backend;
+
+/**
+ * CardDAV abstract Backend
+ *
+ * This class serves as a base-class for addressbook backends
+ *
+ * This class doesn't do much, but it was added for consistency.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+abstract class AbstractBackend implements BackendInterface {
+
+    /**
+     * Returns a list of cards.
+     *
+     * This method should work identical to getCard, but instead return all the
+     * cards in the list as an array.
+     *
+     * If the backend supports this, it may allow for some speed-ups.
+     *
+     * @param mixed $addressBookId
+     * @param array $uris
+     * @return array
+     */
+    function getMultipleCards($addressBookId, array $uris) {
+
+        return array_map(function($uri) use ($addressBookId) {
+            return $this->getCard($addressBookId, $uri);
+        }, $uris);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/Backend/BackendInterface.php b/vendor/sabre/dav/lib/CardDAV/Backend/BackendInterface.php
index 982da3a0f..b9691b906 100644
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/Backend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/BackendInterface.php
@@ -11,7 +11,7 @@ namespace Sabre\CardDAV\Backend;
  * class. The value of the addressBookId is completely up to you, it can be any
  * arbitrary value you can use as an unique identifier.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -34,20 +34,25 @@ interface BackendInterface {
      * @param string $principalUri
      * @return array
      */
-    public function getAddressBooksForUser($principalUri);
+    function getAddressBooksForUser($principalUri);
 
     /**
-     * Updates an addressbook's properties
+     * Updates properties for an address book.
      *
-     * See Sabre\DAV\IProperties for a description of the mutations array, as
-     * well as the return value.
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
      *
-     * @param mixed $addressBookId
-     * @param array $mutations
-     * @see Sabre\DAV\IProperties::updateProperties
-     * @return bool|array
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documenation for more info and examples.
+     *
+     * @param string $addressBookId
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
      */
-    public function updateAddressBook($addressBookId, array $mutations);
+    function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch);
 
     /**
      * Creates a new address book
@@ -57,7 +62,7 @@ interface BackendInterface {
      * @param array $properties
      * @return void
      */
-    public function createAddressBook($principalUri, $url, array $properties);
+    function createAddressBook($principalUri, $url, array $properties);
 
     /**
      * Deletes an entire addressbook and all its contents
@@ -65,7 +70,7 @@ interface BackendInterface {
      * @param mixed $addressBookId
      * @return void
      */
-    public function deleteAddressBook($addressBookId);
+    function deleteAddressBook($addressBookId);
 
     /**
      * Returns all cards for a specific addressbook id.
@@ -86,7 +91,7 @@ interface BackendInterface {
      * @param mixed $addressbookId
      * @return array
      */
-    public function getCards($addressbookId);
+    function getCards($addressbookId);
 
     /**
      * Returns a specfic card.
@@ -94,17 +99,33 @@ interface BackendInterface {
      * The same set of properties must be returned as with getCards. The only
      * exception is that 'carddata' is absolutely required.
      *
+     * If the card does not exist, you must return false.
+     *
      * @param mixed $addressBookId
      * @param string $cardUri
      * @return array
      */
-    public function getCard($addressBookId, $cardUri);
+    function getCard($addressBookId, $cardUri);
+
+    /**
+     * Returns a list of cards.
+     *
+     * This method should work identical to getCard, but instead return all the
+     * cards in the list as an array.
+     *
+     * If the backend supports this, it may allow for some speed-ups.
+     *
+     * @param mixed $addressBookId
+     * @param array $uris
+     * @return array
+     */
+    function getMultipleCards($addressBookId, array $uris);
 
     /**
      * Creates a new card.
      *
      * The addressbook id will be passed as the first argument. This is the
-     * same id as it is returned from the getAddressbooksForUser method.
+     * same id as it is returned from the getAddressBooksForUser method.
      *
      * The cardUri is a base uri, and doesn't include the full path. The
      * cardData argument is the vcard body, and is passed as a string.
@@ -125,13 +146,13 @@ interface BackendInterface {
      * @param string $cardData
      * @return string|null
      */
-    public function createCard($addressBookId, $cardUri, $cardData);
+    function createCard($addressBookId, $cardUri, $cardData);
 
     /**
      * Updates a card.
      *
      * The addressbook id will be passed as the first argument. This is the
-     * same id as it is returned from the getAddressbooksForUser method.
+     * same id as it is returned from the getAddressBooksForUser method.
      *
      * The cardUri is a base uri, and doesn't include the full path. The
      * cardData argument is the vcard body, and is passed as a string.
@@ -152,7 +173,7 @@ interface BackendInterface {
      * @param string $cardData
      * @return string|null
      */
-    public function updateCard($addressBookId, $cardUri, $cardData);
+    function updateCard($addressBookId, $cardUri, $cardData);
 
     /**
      * Deletes a card
@@ -161,6 +182,6 @@ interface BackendInterface {
      * @param string $cardUri
      * @return bool
      */
-    public function deleteCard($addressBookId, $cardUri);
+    function deleteCard($addressBookId, $cardUri);
 
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php b/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php
new file mode 100644
index 000000000..5509ddc02
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php
@@ -0,0 +1,545 @@
+<?php
+
+namespace Sabre\CardDAV\Backend;
+
+use Sabre\CardDAV;
+use Sabre\DAV;
+
+/**
+ * PDO CardDAV backend
+ *
+ * This CardDAV backend uses PDO to store addressbooks
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PDO extends AbstractBackend implements SyncSupport {
+
+    /**
+     * PDO connection
+     *
+     * @var PDO
+     */
+    protected $pdo;
+
+    /**
+     * The PDO table name used to store addressbooks
+     */
+    public $addressBooksTableName = 'addressbooks';
+
+    /**
+     * The PDO table name used to store cards
+     */
+    public $cardsTableName = 'cards';
+
+    /**
+     * The table name that will be used for tracking changes in address books.
+     *
+     * @var string
+     */
+    public $addressBookChangesTableName = 'addressbookchanges';
+
+    /**
+     * Sets up the object
+     *
+     * @param \PDO $pdo
+     */
+    function __construct(\PDO $pdo) {
+
+        $this->pdo = $pdo;
+
+    }
+
+    /**
+     * Returns the list of addressbooks for a specific user.
+     *
+     * @param string $principalUri
+     * @return array
+     */
+    function getAddressBooksForUser($principalUri) {
+
+        $stmt = $this->pdo->prepare('SELECT id, uri, displayname, principaluri, description, synctoken FROM ' . $this->addressBooksTableName . ' WHERE principaluri = ?');
+        $stmt->execute([$principalUri]);
+
+        $addressBooks = [];
+
+        foreach ($stmt->fetchAll() as $row) {
+
+            $addressBooks[] = [
+                'id'                                                          => $row['id'],
+                'uri'                                                         => $row['uri'],
+                'principaluri'                                                => $row['principaluri'],
+                '{DAV:}displayname'                                           => $row['displayname'],
+                '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
+                '{http://calendarserver.org/ns/}getctag'                      => $row['synctoken'],
+                '{http://sabredav.org/ns}sync-token'                          => $row['synctoken'] ? $row['synctoken'] : '0',
+            ];
+
+        }
+
+        return $addressBooks;
+
+    }
+
+
+    /**
+     * Updates properties for an address book.
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documenation for more info and examples.
+     *
+     * @param string $addressBookId
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
+     */
+    function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch) {
+
+        $supportedProperties = [
+            '{DAV:}displayname',
+            '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description',
+        ];
+
+        $propPatch->handle($supportedProperties, function($mutations) use ($addressBookId) {
+
+            $updates = [];
+            foreach ($mutations as $property => $newValue) {
+
+                switch ($property) {
+                    case '{DAV:}displayname' :
+                        $updates['displayname'] = $newValue;
+                        break;
+                    case '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description' :
+                        $updates['description'] = $newValue;
+                        break;
+                }
+            }
+            $query = 'UPDATE ' . $this->addressBooksTableName . ' SET ';
+            $first = true;
+            foreach ($updates as $key => $value) {
+                if ($first) {
+                    $first = false;
+                } else {
+                    $query .= ', ';
+                }
+                $query .= ' `' . $key . '` = :' . $key . ' ';
+            }
+            $query .= ' WHERE id = :addressbookid';
+
+            $stmt = $this->pdo->prepare($query);
+            $updates['addressbookid'] = $addressBookId;
+
+            $stmt->execute($updates);
+
+            $this->addChange($addressBookId, "", 2);
+
+            return true;
+
+        });
+
+    }
+
+    /**
+     * Creates a new address book
+     *
+     * @param string $principalUri
+     * @param string $url Just the 'basename' of the url.
+     * @param array $properties
+     * @return int Last insert id
+     */
+    function createAddressBook($principalUri, $url, array $properties) {
+
+        $values = [
+            'displayname'  => null,
+            'description'  => null,
+            'principaluri' => $principalUri,
+            'uri'          => $url,
+        ];
+
+        foreach ($properties as $property => $newValue) {
+
+            switch ($property) {
+                case '{DAV:}displayname' :
+                    $values['displayname'] = $newValue;
+                    break;
+                case '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description' :
+                    $values['description'] = $newValue;
+                    break;
+                default :
+                    throw new DAV\Exception\BadRequest('Unknown property: ' . $property);
+            }
+
+        }
+
+        $query = 'INSERT INTO ' . $this->addressBooksTableName . ' (uri, displayname, description, principaluri, synctoken) VALUES (:uri, :displayname, :description, :principaluri, 1)';
+        $stmt = $this->pdo->prepare($query);
+        $stmt->execute($values);
+        return $this->pdo->lastInsertId();
+
+    }
+
+    /**
+     * Deletes an entire addressbook and all its contents
+     *
+     * @param int $addressBookId
+     * @return void
+     */
+    function deleteAddressBook($addressBookId) {
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->cardsTableName . ' WHERE addressbookid = ?');
+        $stmt->execute([$addressBookId]);
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->addressBooksTableName . ' WHERE id = ?');
+        $stmt->execute([$addressBookId]);
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->addressBookChangesTableName . ' WHERE addressbookid = ?');
+        $stmt->execute([$addressBookId]);
+
+    }
+
+    /**
+     * Returns all cards for a specific addressbook id.
+     *
+     * This method should return the following properties for each card:
+     *   * carddata - raw vcard data
+     *   * uri - Some unique url
+     *   * lastmodified - A unix timestamp
+     *
+     * It's recommended to also return the following properties:
+     *   * etag - A unique etag. This must change every time the card changes.
+     *   * size - The size of the card in bytes.
+     *
+     * If these last two properties are provided, less time will be spent
+     * calculating them. If they are specified, you can also ommit carddata.
+     * This may speed up certain requests, especially with large cards.
+     *
+     * @param mixed $addressbookId
+     * @return array
+     */
+    function getCards($addressbookId) {
+
+        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, size FROM ' . $this->cardsTableName . ' WHERE addressbookid = ?');
+        $stmt->execute([$addressbookId]);
+
+        $result = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            $row['etag'] = '"' . $row['etag'] . '"';
+            $result[] = $row;
+        }
+        return $result;
+
+    }
+
+    /**
+     * Returns a specfic card.
+     *
+     * The same set of properties must be returned as with getCards. The only
+     * exception is that 'carddata' is absolutely required.
+     *
+     * If the card does not exist, you must return false.
+     *
+     * @param mixed $addressBookId
+     * @param string $cardUri
+     * @return array
+     */
+    function getCard($addressBookId, $cardUri) {
+
+        $stmt = $this->pdo->prepare('SELECT id, carddata, uri, lastmodified, etag, size FROM ' . $this->cardsTableName . ' WHERE addressbookid = ? AND uri = ? LIMIT 1');
+        $stmt->execute([$addressBookId, $cardUri]);
+
+        $result = $stmt->fetch(\PDO::FETCH_ASSOC);
+
+        if (!$result) return false;
+
+        $result['etag'] = '"' . $result['etag'] . '"';
+        return $result;
+
+    }
+
+    /**
+     * Returns a list of cards.
+     *
+     * This method should work identical to getCard, but instead return all the
+     * cards in the list as an array.
+     *
+     * If the backend supports this, it may allow for some speed-ups.
+     *
+     * @param mixed $addressBookId
+     * @param array $uris
+     * @return array
+     */
+    function getMultipleCards($addressBookId, array $uris) {
+
+        $query = 'SELECT id, uri, lastmodified, etag, size, carddata FROM ' . $this->cardsTableName . ' WHERE addressbookid = ? AND uri IN (';
+        // Inserting a whole bunch of question marks
+        $query .= implode(',', array_fill(0, count($uris), '?'));
+        $query .= ')';
+
+        $stmt = $this->pdo->prepare($query);
+        $stmt->execute(array_merge([$addressBookId], $uris));
+        $result = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            $row['etag'] = '"' . $row['etag'] . '"';
+            $result[] = $row;
+        }
+        return $result;
+
+    }
+
+    /**
+     * Creates a new card.
+     *
+     * The addressbook id will be passed as the first argument. This is the
+     * same id as it is returned from the getAddressBooksForUser method.
+     *
+     * The cardUri is a base uri, and doesn't include the full path. The
+     * cardData argument is the vcard body, and is passed as a string.
+     *
+     * It is possible to return an ETag from this method. This ETag is for the
+     * newly created resource, and must be enclosed with double quotes (that
+     * is, the string itself must contain the double quotes).
+     *
+     * You should only return the ETag if you store the carddata as-is. If a
+     * subsequent GET request on the same card does not have the same body,
+     * byte-by-byte and you did return an ETag here, clients tend to get
+     * confused.
+     *
+     * If you don't return an ETag, you can just return null.
+     *
+     * @param mixed $addressBookId
+     * @param string $cardUri
+     * @param string $cardData
+     * @return string|null
+     */
+    function createCard($addressBookId, $cardUri, $cardData) {
+
+        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->cardsTableName . ' (carddata, uri, lastmodified, addressbookid, size, etag) VALUES (?, ?, ?, ?, ?, ?)');
+
+        $etag = md5($cardData);
+
+        $stmt->execute([
+            $cardData,
+            $cardUri,
+            time(),
+            $addressBookId,
+            strlen($cardData),
+            $etag,
+        ]);
+
+        $this->addChange($addressBookId, $cardUri, 1);
+
+        return '"' . $etag . '"';
+
+    }
+
+    /**
+     * Updates a card.
+     *
+     * The addressbook id will be passed as the first argument. This is the
+     * same id as it is returned from the getAddressBooksForUser method.
+     *
+     * The cardUri is a base uri, and doesn't include the full path. The
+     * cardData argument is the vcard body, and is passed as a string.
+     *
+     * It is possible to return an ETag from this method. This ETag should
+     * match that of the updated resource, and must be enclosed with double
+     * quotes (that is: the string itself must contain the actual quotes).
+     *
+     * You should only return the ETag if you store the carddata as-is. If a
+     * subsequent GET request on the same card does not have the same body,
+     * byte-by-byte and you did return an ETag here, clients tend to get
+     * confused.
+     *
+     * If you don't return an ETag, you can just return null.
+     *
+     * @param mixed $addressBookId
+     * @param string $cardUri
+     * @param string $cardData
+     * @return string|null
+     */
+    function updateCard($addressBookId, $cardUri, $cardData) {
+
+        $stmt = $this->pdo->prepare('UPDATE ' . $this->cardsTableName . ' SET carddata = ?, lastmodified = ?, size = ?, etag = ? WHERE uri = ? AND addressbookid =?');
+
+        $etag = md5($cardData);
+        $stmt->execute([
+            $cardData,
+            time(),
+            strlen($cardData),
+            $etag,
+            $cardUri,
+            $addressBookId
+        ]);
+
+        $this->addChange($addressBookId, $cardUri, 2);
+
+        return '"' . $etag . '"';
+
+    }
+
+    /**
+     * Deletes a card
+     *
+     * @param mixed $addressBookId
+     * @param string $cardUri
+     * @return bool
+     */
+    function deleteCard($addressBookId, $cardUri) {
+
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->cardsTableName . ' WHERE addressbookid = ? AND uri = ?');
+        $stmt->execute([$addressBookId, $cardUri]);
+
+        $this->addChange($addressBookId, $cardUri, 3);
+
+        return $stmt->rowCount() === 1;
+
+    }
+
+    /**
+     * The getChanges method returns all the changes that have happened, since
+     * the specified syncToken in the specified address book.
+     *
+     * This function should return an array, such as the following:
+     *
+     * [
+     *   'syncToken' => 'The current synctoken',
+     *   'added'   => [
+     *      'new.txt',
+     *   ],
+     *   'modified'   => [
+     *      'updated.txt',
+     *   ],
+     *   'deleted' => [
+     *      'foo.php.bak',
+     *      'old.txt'
+     *   ]
+     * ];
+     *
+     * The returned syncToken property should reflect the *current* syncToken
+     * of the addressbook, as reported in the {http://sabredav.org/ns}sync-token
+     * property. This is needed here too, to ensure the operation is atomic.
+     *
+     * If the $syncToken argument is specified as null, this is an initial
+     * sync, and all members should be reported.
+     *
+     * The modified property is an array of nodenames that have changed since
+     * the last token.
+     *
+     * The deleted property is an array with nodenames, that have been deleted
+     * from collection.
+     *
+     * The $syncLevel argument is basically the 'depth' of the report. If it's
+     * 1, you only have to report changes that happened only directly in
+     * immediate descendants. If it's 2, it should also include changes from
+     * the nodes below the child collections. (grandchildren)
+     *
+     * The $limit argument allows a client to specify how many results should
+     * be returned at most. If the limit is not specified, it should be treated
+     * as infinite.
+     *
+     * If the limit (infinite or not) is higher than you're willing to return,
+     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     *
+     * If the syncToken is expired (due to data cleanup) or unknown, you must
+     * return null.
+     *
+     * The limit is 'suggestive'. You are free to ignore it.
+     *
+     * @param string $addressBookId
+     * @param string $syncToken
+     * @param int $syncLevel
+     * @param int $limit
+     * @return array
+     */
+    function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null) {
+
+        // Current synctoken
+        $stmt = $this->pdo->prepare('SELECT synctoken FROM ' . $this->addressBooksTableName . ' WHERE id = ?');
+        $stmt->execute([ $addressBookId ]);
+        $currentToken = $stmt->fetchColumn(0);
+
+        if (is_null($currentToken)) return null;
+
+        $result = [
+            'syncToken' => $currentToken,
+            'added'     => [],
+            'modified'  => [],
+            'deleted'   => [],
+        ];
+
+        if ($syncToken) {
+
+            $query = "SELECT uri, operation FROM " . $this->addressBookChangesTableName . " WHERE synctoken >= ? AND synctoken < ? AND addressbookid = ? ORDER BY synctoken";
+            if ($limit > 0) $query .= " LIMIT " . (int)$limit;
+
+            // Fetching all changes
+            $stmt = $this->pdo->prepare($query);
+            $stmt->execute([$syncToken, $currentToken, $addressBookId]);
+
+            $changes = [];
+
+            // This loop ensures that any duplicates are overwritten, only the
+            // last change on a node is relevant.
+            while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+
+                $changes[$row['uri']] = $row['operation'];
+
+            }
+
+            foreach ($changes as $uri => $operation) {
+
+                switch ($operation) {
+                    case 1:
+                        $result['added'][] = $uri;
+                        break;
+                    case 2:
+                        $result['modified'][] = $uri;
+                        break;
+                    case 3:
+                        $result['deleted'][] = $uri;
+                        break;
+                }
+
+            }
+        } else {
+            // No synctoken supplied, this is the initial sync.
+            $query = "SELECT uri FROM " . $this->cardsTableName . " WHERE addressbookid = ?";
+            $stmt = $this->pdo->prepare($query);
+            $stmt->execute([$addressBookId]);
+
+            $result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
+        }
+        return $result;
+
+    }
+
+    /**
+     * Adds a change record to the addressbookchanges table.
+     *
+     * @param mixed $addressBookId
+     * @param string $objectUri
+     * @param int $operation 1 = add, 2 = modify, 3 = delete
+     * @return void
+     */
+    protected function addChange($addressBookId, $objectUri, $operation) {
+
+        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->addressBookChangesTableName . ' (uri, synctoken, addressbookid, operation) SELECT ?, synctoken, ?, ? FROM ' . $this->addressBooksTableName . ' WHERE id = ?');
+        $stmt->execute([
+            $objectUri,
+            $addressBookId,
+            $operation,
+            $addressBookId
+        ]);
+        $stmt = $this->pdo->prepare('UPDATE ' . $this->addressBooksTableName . ' SET synctoken = synctoken + 1 WHERE id = ?');
+        $stmt->execute([
+            $addressBookId
+        ]);
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php b/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php
new file mode 100644
index 000000000..f80618a8e
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php
@@ -0,0 +1,81 @@
+<?php
+
+namespace Sabre\CardDAV\Backend;
+
+/**
+ * WebDAV-sync support for CardDAV backends.
+ *
+ * In order for backends to advertise support for WebDAV-sync, this interface
+ * must be implemented.
+ *
+ * Implementing this can result in a significant reduction of bandwidth and CPU
+ * time.
+ *
+ * For this to work, you _must_ return a {http://sabredav.org/ns}sync-token
+ * property from getAddressBooksForUser.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface SyncSupport extends BackendInterface {
+
+    /**
+     * The getChanges method returns all the changes that have happened, since
+     * the specified syncToken in the specified address book.
+     *
+     * This function should return an array, such as the following:
+     *
+     * [
+     *   'syncToken' => 'The current synctoken',
+     *   'added'   => [
+     *      'new.txt',
+     *   ],
+     *   'modified'   => [
+     *      'modified.txt',
+     *   ],
+     *   'deleted' => [
+     *      'foo.php.bak',
+     *      'old.txt'
+     *   ]
+     * ];
+     *
+     * The returned syncToken property should reflect the *current* syncToken
+     * of the calendar, as reported in the {http://sabredav.org/ns}sync-token
+     * property. This is needed here too, to ensure the operation is atomic.
+     *
+     * If the $syncToken argument is specified as null, this is an initial
+     * sync, and all members should be reported.
+     *
+     * The modified property is an array of nodenames that have changed since
+     * the last token.
+     *
+     * The deleted property is an array with nodenames, that have been deleted
+     * from collection.
+     *
+     * The $syncLevel argument is basically the 'depth' of the report. If it's
+     * 1, you only have to report changes that happened only directly in
+     * immediate descendants. If it's 2, it should also include changes from
+     * the nodes below the child collections. (grandchildren)
+     *
+     * The $limit argument allows a client to specify how many results should
+     * be returned at most. If the limit is not specified, it should be treated
+     * as infinite.
+     *
+     * If the limit (infinite or not) is higher than you're willing to return,
+     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     *
+     * If the syncToken is expired (due to data cleanup) or unknown, you must
+     * return null.
+     *
+     * The limit is 'suggestive'. You are free to ignore it.
+     *
+     * @param string $addressBookId
+     * @param string $syncToken
+     * @param int $syncLevel
+     * @param int $limit
+     * @return array
+     */
+    function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null);
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/Card.php b/vendor/sabre/dav/lib/CardDAV/Card.php
index cc65f7600..8da672502 100644
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/Card.php
+++ b/vendor/sabre/dav/lib/CardDAV/Card.php
@@ -5,11 +5,10 @@ namespace Sabre\CardDAV;
 use Sabre\DAVACL;
 use Sabre\DAV;
 
-
 /**
  * The Card object represents a single Card from an addressbook
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -43,7 +42,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      * @param array $addressBookInfo
      * @param array $cardData
      */
-    public function __construct(Backend\BackendInterface $carddavBackend,array $addressBookInfo,array $cardData) {
+    function __construct(Backend\BackendInterface $carddavBackend, array $addressBookInfo, array $cardData) {
 
         $this->carddavBackend = $carddavBackend;
         $this->addressBookInfo = $addressBookInfo;
@@ -56,7 +55,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return $this->cardData['uri'];
 
@@ -67,7 +66,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return string
      */
-    public function get() {
+    function get() {
 
         // Pre-populating 'carddata' is optional. If we don't yet have it
         // already, we fetch it from the backend.
@@ -84,7 +83,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      * @param string $cardData
      * @return string|null
      */
-    public function put($cardData) {
+    function put($cardData) {
 
         if (is_resource($cardData))
             $cardData = stream_get_contents($cardData);
@@ -92,7 +91,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
         // Converting to UTF-8, if needed
         $cardData = DAV\StringUtil::ensureUTF8($cardData);
 
-        $etag = $this->carddavBackend->updateCard($this->addressBookInfo['id'],$this->cardData['uri'],$cardData);
+        $etag = $this->carddavBackend->updateCard($this->addressBookInfo['id'], $this->cardData['uri'], $cardData);
         $this->cardData['carddata'] = $cardData;
         $this->cardData['etag'] = $etag;
 
@@ -105,9 +104,9 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return void
      */
-    public function delete() {
+    function delete() {
 
-        $this->carddavBackend->deleteCard($this->addressBookInfo['id'],$this->cardData['uri']);
+        $this->carddavBackend->deleteCard($this->addressBookInfo['id'], $this->cardData['uri']);
 
     }
 
@@ -116,9 +115,9 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return string
      */
-    public function getContentType() {
+    function getContentType() {
 
-        return 'text/x-vcard; charset=utf-8';
+        return 'text/vcard; charset=utf-8';
 
     }
 
@@ -127,7 +126,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return string
      */
-    public function getETag() {
+    function getETag() {
 
         if (isset($this->cardData['etag'])) {
             return $this->cardData['etag'];
@@ -148,9 +147,9 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return int
      */
-    public function getLastModified() {
+    function getLastModified() {
 
-        return isset($this->cardData['lastmodified'])?$this->cardData['lastmodified']:null;
+        return isset($this->cardData['lastmodified']) ? $this->cardData['lastmodified'] : null;
 
     }
 
@@ -159,7 +158,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return int
      */
-    public function getSize() {
+    function getSize() {
 
         if (array_key_exists('size', $this->cardData)) {
             return $this->cardData['size'];
@@ -176,7 +175,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return string|null
      */
-    public function getOwner() {
+    function getOwner() {
 
         return $this->addressBookInfo['principaluri'];
 
@@ -189,7 +188,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return string|null
      */
-    public function getGroup() {
+    function getGroup() {
 
         return null;
 
@@ -207,20 +206,25 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
+
+        // An alternative acl may be specified through the cardData array.
+        if (isset($this->cardData['acl'])) {
+            return $this->cardData['acl'];
+        }
 
-        return array(
-            array(
+        return [
+            [
                 'privilege' => '{DAV:}read',
                 'principal' => $this->addressBookInfo['principaluri'],
                 'protected' => true,
-            ),
-            array(
+            ],
+            [
                 'privilege' => '{DAV:}write',
                 'principal' => $this->addressBookInfo['principaluri'],
                 'protected' => true,
-            ),
-        );
+            ],
+        ];
 
     }
 
@@ -232,7 +236,7 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      * @param array $acl
      * @return void
      */
-    public function setACL(array $acl) {
+    function setACL(array $acl) {
 
         throw new DAV\Exception\MethodNotAllowed('Changing ACL is not yet supported');
 
@@ -250,11 +254,10 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return array|null
      */
-    public function getSupportedPrivilegeSet() {
+    function getSupportedPrivilegeSet() {
 
         return null;
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/IAddressBook.php b/vendor/sabre/dav/lib/CardDAV/IAddressBook.php
index e9e990cbd..f80e05575 100644
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/IAddressBook.php
+++ b/vendor/sabre/dav/lib/CardDAV/IAddressBook.php
@@ -9,12 +9,10 @@ use Sabre\DAV;
  *
  * Implement this interface to allow a node to be recognized as an addressbook.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 interface IAddressBook extends DAV\ICollection {
 
-
-
 }
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/ICard.php b/vendor/sabre/dav/lib/CardDAV/ICard.php
index e9a633132..a974cbd8f 100644
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/ICard.php
+++ b/vendor/sabre/dav/lib/CardDAV/ICard.php
@@ -10,11 +10,10 @@ use Sabre\DAV;
  * Extend the ICard interface to allow your custom nodes to be picked up as
  * 'Cards'.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 interface ICard extends DAV\IFile {
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/IDirectory.php b/vendor/sabre/dav/lib/CardDAV/IDirectory.php
index c2774cb45..d991a1cc8 100644
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/IDirectory.php
+++ b/vendor/sabre/dav/lib/CardDAV/IDirectory.php
@@ -11,11 +11,10 @@ namespace Sabre\CardDAV;
  * A full description can be found in the IETF draft:
  *   - draft-daboo-carddav-directory-gateway
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 interface IDirectory extends IAddressBook {
 
-
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Plugin.php b/vendor/sabre/dav/lib/CardDAV/Plugin.php
new file mode 100644
index 000000000..b8bded098
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Plugin.php
@@ -0,0 +1,871 @@
+<?php
+
+namespace Sabre\CardDAV;
+
+use Sabre\DAV;
+use Sabre\DAV\Exception\ReportNotSupported;
+use Sabre\DAV\Xml\Property\Href;
+use Sabre\DAVACL;
+use Sabre\HTTP;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Sabre\VObject;
+
+/**
+ * CardDAV plugin
+ *
+ * The CardDAV plugin adds CardDAV functionality to the WebDAV server
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends DAV\ServerPlugin {
+
+    /**
+     * Url to the addressbooks
+     */
+    const ADDRESSBOOK_ROOT = 'addressbooks';
+
+    /**
+     * xml namespace for CardDAV elements
+     */
+    const NS_CARDDAV = 'urn:ietf:params:xml:ns:carddav';
+
+    /**
+     * Add urls to this property to have them automatically exposed as
+     * 'directories' to the user.
+     *
+     * @var array
+     */
+    public $directories = [];
+
+    /**
+     * Server class
+     *
+     * @var Sabre\DAV\Server
+     */
+    protected $server;
+
+    /**
+     * The default PDO storage uses a MySQL MEDIUMBLOB for iCalendar data,
+     * which can hold up to 2^24 = 16777216 bytes. This is plenty. We're
+     * capping it to 10M here.
+     */
+    protected $maxResourceSize = 10000000;
+
+    /**
+     * Initializes the plugin
+     *
+     * @param DAV\Server $server
+     * @return void
+     */
+    function initialize(DAV\Server $server) {
+
+        /* Events */
+        $server->on('propFind',            [$this, 'propFindEarly']);
+        $server->on('propFind',            [$this, 'propFindLate'], 150);
+        $server->on('report',              [$this, 'report']);
+        $server->on('onHTMLActionsPanel',  [$this, 'htmlActionsPanel']);
+        $server->on('beforeWriteContent',  [$this, 'beforeWriteContent']);
+        $server->on('beforeCreateFile',    [$this, 'beforeCreateFile']);
+        $server->on('afterMethod:GET',     [$this, 'httpAfterGet']);
+
+        $server->xml->namespaceMap[self::NS_CARDDAV] = 'card';
+
+        $server->xml->elementMap['{' . self::NS_CARDDAV . '}addressbook-query'] = 'Sabre\\CardDAV\\Xml\\Request\\AddressBookQueryReport';
+        $server->xml->elementMap['{' . self::NS_CARDDAV . '}addressbook-multiget'] = 'Sabre\\CardDAV\\Xml\\Request\\AddressBookMultiGetReport';
+
+        /* Mapping Interfaces to {DAV:}resourcetype values */
+        $server->resourceTypeMapping['Sabre\\CardDAV\\IAddressBook'] = '{' . self::NS_CARDDAV . '}addressbook';
+        $server->resourceTypeMapping['Sabre\\CardDAV\\IDirectory'] = '{' . self::NS_CARDDAV . '}directory';
+
+        /* Adding properties that may never be changed */
+        $server->protectedProperties[] = '{' . self::NS_CARDDAV . '}supported-address-data';
+        $server->protectedProperties[] = '{' . self::NS_CARDDAV . '}max-resource-size';
+        $server->protectedProperties[] = '{' . self::NS_CARDDAV . '}addressbook-home-set';
+        $server->protectedProperties[] = '{' . self::NS_CARDDAV . '}supported-collation-set';
+
+        $server->xml->elementMap['{http://calendarserver.org/ns/}me-card'] = 'Sabre\\DAV\\Xml\\Property\\Href';
+
+        $this->server = $server;
+
+    }
+
+    /**
+     * Returns a list of supported features.
+     *
+     * This is used in the DAV: header in the OPTIONS and PROPFIND requests.
+     *
+     * @return array
+     */
+    function getFeatures() {
+
+        return ['addressbook'];
+
+    }
+
+    /**
+     * Returns a list of reports this plugin supports.
+     *
+     * This will be used in the {DAV:}supported-report-set property.
+     * Note that you still need to subscribe to the 'report' event to actually
+     * implement them
+     *
+     * @param string $uri
+     * @return array
+     */
+    function getSupportedReportSet($uri) {
+
+        $node = $this->server->tree->getNodeForPath($uri);
+        if ($node instanceof IAddressBook || $node instanceof ICard) {
+            return [
+                 '{' . self::NS_CARDDAV . '}addressbook-multiget',
+                 '{' . self::NS_CARDDAV . '}addressbook-query',
+            ];
+        }
+        return [];
+
+    }
+
+
+    /**
+     * Adds all CardDAV-specific properties
+     *
+     * @param DAV\PropFind $propFind
+     * @param DAV\INode $node
+     * @return void
+     */
+    function propFindEarly(DAV\PropFind $propFind, DAV\INode $node) {
+
+        $ns = '{' . self::NS_CARDDAV . '}';
+
+        if ($node instanceof IAddressBook) {
+
+            $propFind->handle($ns . 'max-resource-size', $this->maxResourceSize);
+            $propFind->handle($ns . 'supported-address-data', function() {
+                return new Xml\Property\SupportedAddressData();
+            });
+            $propFind->handle($ns . 'supported-collation-set', function() {
+                return new Xml\Property\SupportedCollationSet();
+            });
+
+        }
+        if ($node instanceof DAVACL\IPrincipal) {
+
+            $path = $propFind->getPath();
+
+            $propFind->handle('{' . self::NS_CARDDAV . '}addressbook-home-set', function() use ($path) {
+                return new Href($this->getAddressBookHomeForPrincipal($path) . '/');
+            });
+
+            if ($this->directories) $propFind->handle('{' . self::NS_CARDDAV . '}directory-gateway', function() {
+                return new Href($this->directories);
+            });
+
+        }
+
+        if ($node instanceof ICard) {
+
+            // The address-data property is not supposed to be a 'real'
+            // property, but in large chunks of the spec it does act as such.
+            // Therefore we simply expose it as a property.
+            $propFind->handle('{' . self::NS_CARDDAV . '}address-data', function() use ($node) {
+                $val = $node->get();
+                if (is_resource($val))
+                    $val = stream_get_contents($val);
+
+                return $val;
+
+            });
+
+        }
+
+    }
+
+    /**
+     * This functions handles REPORT requests specific to CardDAV
+     *
+     * @param string $reportName
+     * @param \DOMNode $dom
+     * @param mixed $path
+     * @return bool
+     */
+    function report($reportName, $dom, $path) {
+
+        switch ($reportName) {
+            case '{' . self::NS_CARDDAV . '}addressbook-multiget' :
+                $this->server->transactionType = 'report-addressbook-multiget';
+                $this->addressbookMultiGetReport($dom);
+                return false;
+            case '{' . self::NS_CARDDAV . '}addressbook-query' :
+                $this->server->transactionType = 'report-addressbook-query';
+                $this->addressBookQueryReport($dom);
+                return false;
+            default :
+                return;
+
+        }
+
+
+    }
+
+    /**
+     * Returns the addressbook home for a given principal
+     *
+     * @param string $principal
+     * @return string
+     */
+    protected function getAddressbookHomeForPrincipal($principal) {
+
+        list(, $principalId) = \Sabre\HTTP\URLUtil::splitPath($principal);
+        return self::ADDRESSBOOK_ROOT . '/' . $principalId;
+
+    }
+
+
+    /**
+     * This function handles the addressbook-multiget REPORT.
+     *
+     * This report is used by the client to fetch the content of a series
+     * of urls. Effectively avoiding a lot of redundant requests.
+     *
+     * @param Xml\Request\AddressBookMultiGetReport $report
+     * @return void
+     */
+    function addressbookMultiGetReport($report) {
+
+        $contentType = $report->contentType;
+        $version = $report->version;
+        if ($version) {
+            $contentType .= '; version=' . $version;
+        }
+
+        $vcardType = $this->negotiateVCard(
+            $contentType
+        );
+
+        $propertyList = [];
+        $paths = array_map(
+            [$this->server, 'calculateUri'],
+            $report->hrefs
+        );
+        foreach ($this->server->getPropertiesForMultiplePaths($paths, $report->properties) as $props) {
+
+            if (isset($props['200']['{' . self::NS_CARDDAV . '}address-data'])) {
+
+                $props['200']['{' . self::NS_CARDDAV . '}address-data'] = $this->convertVCard(
+                    $props[200]['{' . self::NS_CARDDAV . '}address-data'],
+                    $vcardType
+                );
+
+            }
+            $propertyList[] = $props;
+
+        }
+
+        $prefer = $this->server->getHTTPPrefer();
+
+        $this->server->httpResponse->setStatus(207);
+        $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $this->server->httpResponse->setHeader('Vary', 'Brief,Prefer');
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($propertyList, $prefer['return'] === 'minimal'));
+
+    }
+
+    /**
+     * This method is triggered before a file gets updated with new content.
+     *
+     * This plugin uses this method to ensure that Card nodes receive valid
+     * vcard data.
+     *
+     * @param string $path
+     * @param DAV\IFile $node
+     * @param resource $data
+     * @param bool $modified Should be set to true, if this event handler
+     *                       changed &$data.
+     * @return void
+     */
+    function beforeWriteContent($path, DAV\IFile $node, &$data, &$modified) {
+
+        if (!$node instanceof ICard)
+            return;
+
+        $this->validateVCard($data, $modified);
+
+    }
+
+    /**
+     * This method is triggered before a new file is created.
+     *
+     * This plugin uses this method to ensure that Card nodes receive valid
+     * vcard data.
+     *
+     * @param string $path
+     * @param resource $data
+     * @param DAV\ICollection $parentNode
+     * @param bool $modified Should be set to true, if this event handler
+     *                       changed &$data.
+     * @return void
+     */
+    function beforeCreateFile($path, &$data, DAV\ICollection $parentNode, &$modified) {
+
+        if (!$parentNode instanceof IAddressBook)
+            return;
+
+        $this->validateVCard($data, $modified);
+
+    }
+
+    /**
+     * Checks if the submitted iCalendar data is in fact, valid.
+     *
+     * An exception is thrown if it's not.
+     *
+     * @param resource|string $data
+     * @param bool $modified Should be set to true, if this event handler
+     *                       changed &$data.
+     * @return void
+     */
+    protected function validateVCard(&$data, &$modified) {
+
+        // If it's a stream, we convert it to a string first.
+        if (is_resource($data)) {
+            $data = stream_get_contents($data);
+        }
+
+        $before = md5($data);
+
+        // Converting the data to unicode, if needed.
+        $data = DAV\StringUtil::ensureUTF8($data);
+
+        if (md5($data) !== $before) $modified = true;
+
+        try {
+
+            // If the data starts with a [, we can reasonably assume we're dealing
+            // with a jCal object.
+            if (substr($data, 0, 1) === '[') {
+                $vobj = VObject\Reader::readJson($data);
+
+                // Converting $data back to iCalendar, as that's what we
+                // technically support everywhere.
+                $data = $vobj->serialize();
+                $modified = true;
+            } else {
+                $vobj = VObject\Reader::read($data);
+            }
+
+        } catch (VObject\ParseException $e) {
+
+            throw new DAV\Exception\UnsupportedMediaType('This resource only supports valid vCard or jCard data. Parse error: ' . $e->getMessage());
+
+        }
+
+        if ($vobj->name !== 'VCARD') {
+            throw new DAV\Exception\UnsupportedMediaType('This collection can only support vcard objects.');
+        }
+
+        if (!isset($vobj->UID)) {
+            // No UID in vcards is invalid, but we'll just add it in anyway.
+            $vobj->add('UID', DAV\UUIDUtil::getUUID());
+            $data = $vobj->serialize();
+            $modified = true;
+        }
+
+        // Destroy circular references to PHP will GC the object.
+        $vobj->destroy();
+    }
+
+
+    /**
+     * This function handles the addressbook-query REPORT
+     *
+     * This report is used by the client to filter an addressbook based on a
+     * complex query.
+     *
+     * @param Xml\Request\AddressBookQueryReport $report
+     * @return void
+     */
+    protected function addressbookQueryReport($report) {
+
+        $depth = $this->server->getHTTPDepth(0);
+
+        if ($depth == 0) {
+            $candidateNodes = [
+                $this->server->tree->getNodeForPath($this->server->getRequestUri())
+            ];
+            if (!$candidateNodes[0] instanceof ICard) {
+                throw new ReportNotSupported('The addressbook-query report is not supported on this url with Depth: 0');
+            }
+        } else {
+            $candidateNodes = $this->server->tree->getChildren($this->server->getRequestUri());
+        }
+
+        $contentType = $report->contentType;
+        if ($report->version) {
+            $contentType .= '; version=' . $report->version;
+        }
+
+        $vcardType = $this->negotiateVCard(
+            $contentType
+        );
+
+        $validNodes = [];
+        foreach ($candidateNodes as $node) {
+
+            if (!$node instanceof ICard)
+                continue;
+
+            $blob = $node->get();
+            if (is_resource($blob)) {
+                $blob = stream_get_contents($blob);
+            }
+
+            if (!$this->validateFilters($blob, $report->filters, $report->test)) {
+                continue;
+            }
+
+            $validNodes[] = $node;
+
+            if ($report->limit && $report->limit <= count($validNodes)) {
+                // We hit the maximum number of items, we can stop now.
+                break;
+            }
+
+        }
+
+        $result = [];
+        foreach ($validNodes as $validNode) {
+
+            if ($depth == 0) {
+                $href = $this->server->getRequestUri();
+            } else {
+                $href = $this->server->getRequestUri() . '/' . $validNode->getName();
+            }
+
+            list($props) = $this->server->getPropertiesForPath($href, $report->properties, 0);
+
+            if (isset($props[200]['{' . self::NS_CARDDAV . '}address-data'])) {
+
+                $props[200]['{' . self::NS_CARDDAV . '}address-data'] = $this->convertVCard(
+                    $props[200]['{' . self::NS_CARDDAV . '}address-data'],
+                    $vcardType
+                );
+
+            }
+            $result[] = $props;
+
+        }
+
+        $prefer = $this->server->getHTTPPrefer();
+
+        $this->server->httpResponse->setStatus(207);
+        $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $this->server->httpResponse->setHeader('Vary', 'Brief,Prefer');
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($result, $prefer['return'] === 'minimal'));
+
+    }
+
+    /**
+     * Validates if a vcard makes it throught a list of filters.
+     *
+     * @param string $vcardData
+     * @param array $filters
+     * @param string $test anyof or allof (which means OR or AND)
+     * @return bool
+     */
+    function validateFilters($vcardData, array $filters, $test) {
+
+
+        if (!$filters) return true;
+        $vcard = VObject\Reader::read($vcardData);
+
+        foreach ($filters as $filter) {
+
+            $isDefined = isset($vcard->{$filter['name']});
+            if ($filter['is-not-defined']) {
+                if ($isDefined) {
+                    $success = false;
+                } else {
+                    $success = true;
+                }
+            } elseif ((!$filter['param-filters'] && !$filter['text-matches']) || !$isDefined) {
+
+                // We only need to check for existence
+                $success = $isDefined;
+
+            } else {
+
+                $vProperties = $vcard->select($filter['name']);
+
+                $results = [];
+                if ($filter['param-filters']) {
+                    $results[] = $this->validateParamFilters($vProperties, $filter['param-filters'], $filter['test']);
+                }
+                if ($filter['text-matches']) {
+                    $texts = [];
+                    foreach ($vProperties as $vProperty)
+                        $texts[] = $vProperty->getValue();
+
+                    $results[] = $this->validateTextMatches($texts, $filter['text-matches'], $filter['test']);
+                }
+
+                if (count($results) === 1) {
+                    $success = $results[0];
+                } else {
+                    if ($filter['test'] === 'anyof') {
+                        $success = $results[0] || $results[1];
+                    } else {
+                        $success = $results[0] && $results[1];
+                    }
+                }
+
+            } // else
+
+            // There are two conditions where we can already determine whether
+            // or not this filter succeeds.
+            if ($test === 'anyof' && $success) {
+
+                // Destroy circular references to PHP will GC the object.
+                $vcard->destroy();
+
+                return true;
+            }
+            if ($test === 'allof' && !$success) {
+
+                // Destroy circular references to PHP will GC the object.
+                $vcard->destroy();
+
+                return false;
+            }
+
+        } // foreach
+
+
+        // Destroy circular references to PHP will GC the object.
+        $vcard->destroy();
+
+        // If we got all the way here, it means we haven't been able to
+        // determine early if the test failed or not.
+        //
+        // This implies for 'anyof' that the test failed, and for 'allof' that
+        // we succeeded. Sounds weird, but makes sense.
+        return $test === 'allof';
+
+    }
+
+    /**
+     * Validates if a param-filter can be applied to a specific property.
+     *
+     * @todo currently we're only validating the first parameter of the passed
+     *       property. Any subsequence parameters with the same name are
+     *       ignored.
+     * @param array $vProperties
+     * @param array $filters
+     * @param string $test
+     * @return bool
+     */
+    protected function validateParamFilters(array $vProperties, array $filters, $test) {
+
+        foreach ($filters as $filter) {
+
+            $isDefined = false;
+            foreach ($vProperties as $vProperty) {
+                $isDefined = isset($vProperty[$filter['name']]);
+                if ($isDefined) break;
+            }
+
+            if ($filter['is-not-defined']) {
+                if ($isDefined) {
+                    $success = false;
+                } else {
+                    $success = true;
+                }
+
+            // If there's no text-match, we can just check for existence
+            } elseif (!$filter['text-match'] || !$isDefined) {
+
+                $success = $isDefined;
+
+            } else {
+
+                $success = false;
+                foreach ($vProperties as $vProperty) {
+                    // If we got all the way here, we'll need to validate the
+                    // text-match filter.
+                    $success = DAV\StringUtil::textMatch($vProperty[$filter['name']]->getValue(), $filter['text-match']['value'], $filter['text-match']['collation'], $filter['text-match']['match-type']);
+                    if ($success) break;
+                }
+                if ($filter['text-match']['negate-condition']) {
+                    $success = !$success;
+                }
+
+            } // else
+
+            // There are two conditions where we can already determine whether
+            // or not this filter succeeds.
+            if ($test === 'anyof' && $success) {
+                return true;
+            }
+            if ($test === 'allof' && !$success) {
+                return false;
+            }
+
+        }
+
+        // If we got all the way here, it means we haven't been able to
+        // determine early if the test failed or not.
+        //
+        // This implies for 'anyof' that the test failed, and for 'allof' that
+        // we succeeded. Sounds weird, but makes sense.
+        return $test === 'allof';
+
+    }
+
+    /**
+     * Validates if a text-filter can be applied to a specific property.
+     *
+     * @param array $texts
+     * @param array $filters
+     * @param string $test
+     * @return bool
+     */
+    protected function validateTextMatches(array $texts, array $filters, $test) {
+
+        foreach ($filters as $filter) {
+
+            $success = false;
+            foreach ($texts as $haystack) {
+                $success = DAV\StringUtil::textMatch($haystack, $filter['value'], $filter['collation'], $filter['match-type']);
+
+                // Breaking on the first match
+                if ($success) break;
+            }
+            if ($filter['negate-condition']) {
+                $success = !$success;
+            }
+
+            if ($success && $test === 'anyof')
+                return true;
+
+            if (!$success && $test == 'allof')
+                return false;
+
+
+        }
+
+        // If we got all the way here, it means we haven't been able to
+        // determine early if the test failed or not.
+        //
+        // This implies for 'anyof' that the test failed, and for 'allof' that
+        // we succeeded. Sounds weird, but makes sense.
+        return $test === 'allof';
+
+    }
+
+    /**
+     * This event is triggered when fetching properties.
+     *
+     * This event is scheduled late in the process, after most work for
+     * propfind has been done.
+     *
+     * @param DAV\PropFind $propFind
+     * @param DAV\INode $node
+     * @return void
+     */
+    function propFindLate(DAV\PropFind $propFind, DAV\INode $node) {
+
+        // If the request was made using the SOGO connector, we must rewrite
+        // the content-type property. By default SabreDAV will send back
+        // text/x-vcard; charset=utf-8, but for SOGO we must strip that last
+        // part.
+        if (strpos($this->server->httpRequest->getHeader('User-Agent'), 'Thunderbird') === false) {
+            return;
+        }
+        $contentType = $propFind->get('{DAV:}getcontenttype');
+        list($part) = explode(';', $contentType);
+        if ($part === 'text/x-vcard' || $part === 'text/vcard') {
+            $propFind->set('{DAV:}getcontenttype', 'text/x-vcard');
+        }
+
+    }
+
+    /**
+     * This method is used to generate HTML output for the
+     * Sabre\DAV\Browser\Plugin. This allows us to generate an interface users
+     * can use to create new addressbooks.
+     *
+     * @param DAV\INode $node
+     * @param string $output
+     * @return bool
+     */
+    function htmlActionsPanel(DAV\INode $node, &$output) {
+
+        if (!$node instanceof AddressBookHome)
+            return;
+
+        $output .= '<tr><td colspan="2"><form method="post" action="">
+            <h3>Create new address book</h3>
+            <input type="hidden" name="sabreAction" value="mkcol" />
+            <input type="hidden" name="resourceType" value="{DAV:}collection,{' . self::NS_CARDDAV . '}addressbook" />
+            <label>Name (uri):</label> <input type="text" name="name" /><br />
+            <label>Display name:</label> <input type="text" name="{DAV:}displayname" /><br />
+            <input type="submit" value="create" />
+            </form>
+            </td></tr>';
+
+        return false;
+
+    }
+
+    /**
+     * This event is triggered after GET requests.
+     *
+     * This is used to transform data into jCal, if this was requested.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function httpAfterGet(RequestInterface $request, ResponseInterface $response) {
+
+        if (strpos($response->getHeader('Content-Type'), 'text/vcard') === false) {
+            return;
+        }
+
+        $target = $this->negotiateVCard($request->getHeader('Accept'), $mimeType);
+
+        $newBody = $this->convertVCard(
+            $response->getBody(),
+            $target
+        );
+
+        $response->setBody($newBody);
+        $response->setHeader('Content-Type', $mimeType . '; charset=utf-8');
+        $response->setHeader('Content-Length', strlen($newBody));
+
+    }
+
+    /**
+     * This helper function performs the content-type negotiation for vcards.
+     *
+     * It will return one of the following strings:
+     * 1. vcard3
+     * 2. vcard4
+     * 3. jcard
+     *
+     * It defaults to vcard3.
+     *
+     * @param string $input
+     * @param string $mimeType
+     * @return string
+     */
+    protected function negotiateVCard($input, &$mimeType = null) {
+
+        $result = HTTP\Util::negotiate(
+            $input,
+            [
+                // Most often used mime-type. Version 3
+                'text/x-vcard',
+                // The correct standard mime-type. Defaults to version 3 as
+                // well.
+                'text/vcard',
+                // vCard 4
+                'text/vcard; version=4.0',
+                // vCard 3
+                'text/vcard; version=3.0',
+                // jCard
+                'application/vcard+json',
+            ]
+        );
+
+        $mimeType = $result;
+        switch ($result) {
+
+            default :
+            case 'text/x-vcard' :
+            case 'text/vcard' :
+            case 'text/vcard; version=3.0' :
+                $mimeType = 'text/vcard';
+                return 'vcard3';
+            case 'text/vcard; version=4.0' :
+                return 'vcard4';
+            case 'application/vcard+json' :
+                return 'jcard';
+
+        // @codeCoverageIgnoreStart
+        }
+        // @codeCoverageIgnoreEnd
+
+    }
+
+    /**
+     * Converts a vcard blob to a different version, or jcard.
+     *
+     * @param string $data
+     * @param string $target
+     * @return string
+     */
+    protected function convertVCard($data, $target) {
+
+        $data = VObject\Reader::read($data);
+        switch ($target) {
+            default :
+            case 'vcard3' :
+                $data = $data->convert(VObject\Document::VCARD30);
+                $newResult = $data->serialize();
+                break;
+            case 'vcard4' :
+                $data = $data->convert(VObject\Document::VCARD40);
+                $newResult = $data->serialize();
+                break;
+            case 'jcard' :
+                $data = $data->convert(VObject\Document::VCARD40);
+                $newResult = json_encode($data->jsonSerialize());
+                break;
+
+        }
+        // Destroy circular references to PHP will GC the object.
+        $data->destroy();
+
+        return $newResult;
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'carddav';
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Adds support for CardDAV (rfc6352)',
+            'link'        => 'http://sabre.io/dav/carddav/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/VCFExportPlugin.php b/vendor/sabre/dav/lib/CardDAV/VCFExportPlugin.php
new file mode 100644
index 000000000..de8b3bb84
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/VCFExportPlugin.php
@@ -0,0 +1,152 @@
+<?php
+
+namespace Sabre\CardDAV;
+
+use Sabre\DAV;
+use Sabre\VObject;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * VCF Exporter
+ *
+ * This plugin adds the ability to export entire address books as .vcf files.
+ * This is useful for clients that don't support CardDAV yet. They often do
+ * support vcf files.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @author Thomas Tanghus (http://tanghus.net/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class VCFExportPlugin extends DAV\ServerPlugin {
+
+    /**
+     * Reference to Server class
+     *
+     * @var Sabre\DAV\Server
+     */
+    protected $server;
+
+    /**
+     * Initializes the plugin and registers event handlers
+     *
+     * @param DAV\Server $server
+     * @return void
+     */
+    function initialize(DAV\Server $server) {
+
+        $this->server = $server;
+        $this->server->on('method:GET', [$this, 'httpGet'], 90);
+        $server->on('browserButtonActions', function($path, $node, &$actions) {
+            if ($node instanceof IAddressBook) {
+                $actions .= '<a href="' . htmlspecialchars($path, ENT_QUOTES, 'UTF-8') . '?export"><span class="oi" data-glyph="book"></span></a>';
+            }
+        });
+    }
+
+    /**
+     * Intercepts GET requests on addressbook urls ending with ?export.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpGet(RequestInterface $request, ResponseInterface $response) {
+
+        $queryParams = $request->getQueryParameters();
+        if (!array_key_exists('export', $queryParams)) return;
+
+        $path = $request->getPath();
+
+        $node = $this->server->tree->getNodeForPath($path);
+
+        if (!($node instanceof IAddressBook)) return;
+
+        $this->server->transactionType = 'get-addressbook-export';
+
+        // Checking ACL, if available.
+        if ($aclPlugin = $this->server->getPlugin('acl')) {
+            $aclPlugin->checkPrivileges($path, '{DAV:}read');
+        }
+
+        $response->setHeader('Content-Type', 'text/directory');
+        $response->setStatus(200);
+
+        $nodes = $this->server->getPropertiesForPath($path, [
+            '{' . Plugin::NS_CARDDAV . '}address-data',
+        ], 1);
+
+        $response->setBody($this->generateVCF($nodes));
+
+        // Returning false to break the event chain
+        return false;
+
+    }
+
+    /**
+     * Merges all vcard objects, and builds one big vcf export
+     *
+     * @param array $nodes
+     * @return string
+     */
+    function generateVCF(array $nodes) {
+
+        $output = "";
+
+        foreach ($nodes as $node) {
+
+            if (!isset($node[200]['{' . Plugin::NS_CARDDAV . '}address-data'])) {
+                continue;
+            }
+            $nodeData = $node[200]['{' . Plugin::NS_CARDDAV . '}address-data'];
+
+            // Parsing this node so VObject can clean up the output.
+            $vcard = VObject\Reader::read($nodeData);
+            $output .= $vcard->serialize();
+
+            // Destroy circular references to PHP will GC the object.
+            $vcard->destroy();
+
+        }
+
+        return $output;
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using \Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'vcf-export';
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Adds the ability to export CardDAV addressbooks as a single vCard file.',
+            'link'        => 'http://sabre.io/dav/vcf-export-plugin/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/Xml/Filter/AddressData.php b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/AddressData.php
new file mode 100644
index 000000000..34028db85
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/AddressData.php
@@ -0,0 +1,59 @@
+<?php
+
+namespace Sabre\CardDAV\Xml\Filter;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+
+/**
+ * AddressData parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:carddav}address-data XML
+ * element, as defined in:
+ *
+ * http://tools.ietf.org/html/rfc6352#section-10.4
+ *
+ * This element is used in two distinct places, but this one specifically
+ * encodes the address-data element as it appears in the addressbook-query
+ * adressbook-multiget REPORT requests.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class AddressData implements XmlDeserializable {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $result = [
+            'contentType' => $reader->getAttribute('content-type') ?: 'text/vcard',
+            'version'     => $reader->getAttribute('version') ?: '3.0',
+        ];
+
+        $reader->next();
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/Xml/Filter/ParamFilter.php b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/ParamFilter.php
new file mode 100644
index 000000000..9646ae3e6
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/ParamFilter.php
@@ -0,0 +1,89 @@
+<?php
+
+namespace Sabre\CardDAV\Xml\Filter;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\CardDAV\Plugin;
+
+/**
+ * ParamFilter parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:carddav}param-filter XML
+ * element, as defined in:
+ *
+ * http://tools.ietf.org/html/rfc6352#section-10.5.2
+ *
+ * The result will be spit out as an array.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+abstract class ParamFilter implements Element {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $result = [
+            'name'           => null,
+            'is-not-defined' => false,
+            'text-match'     => null,
+        ];
+
+        $att = $reader->parseAttributes();
+        $result['name'] = $att['name'];
+
+        $elems = $reader->parseInnerTree();
+
+        if (is_array($elems)) foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{' . Plugin::NS_CARDDAV . '}is-not-defined' :
+                    $result['is-not-defined'] = true;
+                    break;
+                case '{' . Plugin::NS_CARDDAV . '}text-match' :
+                    $matchType = isset($elem['attributes']['match-type']) ? $elem['attributes']['match-type'] : 'contains';
+
+                    if (!in_array($matchType, ['contains', 'equals', 'starts-with', 'ends-with'])) {
+                        throw new BadRequest('Unknown match-type: ' . $matchType);
+                    }
+                    $result['text-match'] = [
+                        'negate-condition' => isset($elem['attributes']['negate-condition']) && $elem['attributes']['negate-condition'] === 'yes',
+                        'collation'        => isset($elem['attributes']['collation']) ? $elem['attributes']['collation'] : 'i;unicode-casemap',
+                        'value'            => $elem['value'],
+                        'match-type'       => $matchType,
+                    ];
+                    break;
+
+            }
+
+        }
+
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/Xml/Filter/PropFilter.php b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/PropFilter.php
new file mode 100644
index 000000000..c162da160
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/PropFilter.php
@@ -0,0 +1,98 @@
+<?php
+
+namespace Sabre\CardDAV\Xml\Filter;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\CardDAV\Plugin;
+
+/**
+ * PropFilter parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:carddav}prop-filter XML
+ * element, as defined in:
+ *
+ * http://tools.ietf.org/html/rfc6352#section-10.5.1
+ *
+ * The result will be spit out as an array.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PropFilter implements XmlDeserializable {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $result = [
+            'name'           => null,
+            'test'           => 'anyof',
+            'is-not-defined' => false,
+            'param-filters'  => [],
+            'text-matches'   => [],
+        ];
+
+        $att = $reader->parseAttributes();
+        $result['name'] = $att['name'];
+
+        if (isset($att['test']) && $att['test'] === 'allof') {
+            $result['test'] = 'allof';
+        }
+
+        $elems = $reader->parseInnerTree();
+
+        if (is_array($elems)) foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{' . Plugin::NS_CARDDAV . '}param-filter' :
+                    $result['param-filters'][] = $elem['value'];
+                    break;
+                case '{' . Plugin::NS_CARDDAV . '}is-not-defined' :
+                    $result['is-not-defined'] = true;
+                    break;
+                case '{' . Plugin::NS_CARDDAV . '}text-match' :
+                    $matchType = isset($elem['attributes']['match-type']) ? $elem['attributes']['match-type'] : 'contains';
+
+                    if (!in_array($matchType, ['contains', 'equals', 'starts-with', 'ends-with'])) {
+                        throw new BadRequest('Unknown match-type: ' . $matchType);
+                    }
+                    $result['text-matches'][] = [
+                        'negate-condition' => isset($elem['attributes']['negate-condition']) && $elem['attributes']['negate-condition'] === 'yes',
+                        'collation'        => isset($elem['attributes']['collation']) ? $elem['attributes']['collation'] : 'i;unicode-casemap',
+                        'value'            => $elem['value'],
+                        'match-type'       => $matchType,
+                    ];
+                    break;
+
+            }
+
+        }
+
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedAddressData.php b/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedAddressData.php
new file mode 100644
index 000000000..6ff57b6e3
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedAddressData.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Sabre\CardDAV\Xml\Property;
+
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+use Sabre\CardDAV\Plugin;
+
+/**
+ * Supported-address-data property
+ *
+ * This property is a representation of the supported-address-data property
+ * in the CardDAV namespace.
+ *
+ * This property is defined in:
+ *
+ * http://tools.ietf.org/html/rfc6352#section-6.2.2
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedAddressData implements XmlSerializable {
+
+    /**
+     * supported versions
+     *
+     * @var array
+     */
+    protected $supportedData = [];
+
+    /**
+     * Creates the property
+     *
+     * @param array|null $supportedData
+     */
+    function __construct(array $supportedData = null) {
+
+        if (is_null($supportedData)) {
+            $supportedData = [
+                ['contentType' => 'text/vcard', 'version' => '3.0'],
+                ['contentType' => 'text/vcard', 'version' => '4.0'],
+                ['contentType' => 'application/vcard+json', 'version' => '4.0'],
+            ];
+        }
+
+        $this->supportedData = $supportedData;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->supportedData as $supported) {
+            $writer->startElement('{' . Plugin::NS_CARDDAV . '}address-data-type');
+            $writer->writeAttributes([
+                'content-type' => $supported['contentType'],
+                'version'      => $supported['version']
+                ]);
+            $writer->endElement(); // address-data-type
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedCollationSet.php b/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedCollationSet.php
new file mode 100644
index 000000000..1fc064900
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedCollationSet.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Sabre\CardDAV\Xml\Property;
+
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+
+/**
+ * supported-collation-set property
+ *
+ * This property is a representation of the supported-collation-set property
+ * in the CardDAV namespace.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedCollationSet implements XmlSerializable {
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach (['i;ascii-casemap', 'i;octet', 'i;unicode-casemap'] as $coll) {
+            $writer->writeElement('{urn:ietf:params:xml:ns:carddav}supported-collation', $coll);
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookMultiGetReport.php b/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookMultiGetReport.php
new file mode 100644
index 000000000..c97c5eb4f
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookMultiGetReport.php
@@ -0,0 +1,113 @@
+<?php
+
+namespace Sabre\CardDAV\Xml\Request;
+
+use Sabre\CardDAV\Plugin;
+use Sabre\Uri;
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+
+/**
+ * AddressBookMultiGetReport request parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:carddav}addressbook-multiget
+ * REPORT, as defined in:
+ *
+ * http://tools.ietf.org/html/rfc6352#section-8.7
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class AddressBookMultiGetReport implements XmlDeserializable {
+
+    /**
+     * An array with requested properties.
+     *
+     * @var array
+     */
+    public $properties;
+
+    /**
+     * This is an array with the urls that are being requested.
+     *
+     * @var array
+     */
+    public $hrefs;
+
+    /**
+     * The mimetype of the content that should be returend. Usually
+     * text/vcard.
+     *
+     * @var string
+     */
+    public $contentType = null;
+
+    /**
+     * The version of vcard data that should be returned. Usually 3.0,
+     * referring to vCard 3.0.
+     *
+     * @var string
+     */
+    public $version = null;
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = $reader->parseInnerTree([
+            '{urn:ietf:params:xml:ns:carddav}address-data' => 'Sabre\\CardDAV\\Xml\\Filter\\AddressData',
+            '{DAV:}prop'                                   => 'Sabre\\Xml\\Element\\KeyValue',
+        ]);
+
+        $newProps = [
+            'hrefs'      => [],
+            'properties' => []
+        ];
+
+        foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{DAV:}prop' :
+                    $newProps['properties'] = array_keys($elem['value']);
+                    if (isset($elem['value']['{' . Plugin::NS_CARDDAV . '}address-data'])) {
+                        $newProps += $elem['value']['{' . Plugin::NS_CARDDAV . '}address-data'];
+                    }
+                    break;
+                case '{DAV:}href' :
+                    $newProps['hrefs'][] = Uri\resolve($reader->contextUri, $elem['value']);
+                    break;
+
+            }
+
+        }
+
+        $obj = new self();
+        foreach ($newProps as $key => $value) {
+            $obj->$key = $value;
+        }
+        return $obj;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookQueryReport.php b/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookQueryReport.php
new file mode 100644
index 000000000..a68ac5800
--- /dev/null
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookQueryReport.php
@@ -0,0 +1,192 @@
+<?php
+
+namespace Sabre\CardDAV\Xml\Request;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\CardDAV\Plugin;
+
+/**
+ * AddressBookQueryReport request parser.
+ *
+ * This class parses the {urn:ietf:params:xml:ns:carddav}addressbook-query
+ * REPORT, as defined in:
+ *
+ * http://tools.ietf.org/html/rfc6352#section-8.6
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class AddressBookQueryReport implements XmlDeserializable {
+
+    /**
+     * An array with requested properties.
+     *
+     * @var array
+     */
+    public $properties;
+
+    /**
+     * List of property/component filters.
+     *
+     * This is an array with filters. Every item is a property filter. Every
+     * property filter has the following keys:
+     *   * name - name of the component to filter on
+     *   * test - anyof or allof
+     *   * is-not-defined - Test for non-existence
+     *   * param-filters - A list of parameter filters on the property
+     *   * text-matches - A list of text values the filter needs to match
+     *
+     * Each param-filter has the following keys:
+     *   * name - name of the parameter
+     *   * is-not-defined - Test for non-existence
+     *   * text-match - Match the parameter value
+     *
+     * Each text-match in property filters, and the single text-match in
+     * param-filters have the following keys:
+     *
+     *   * value - value to match
+     *   * match-type - contains, starts-with, ends-with, equals
+     *   * negate-condition - Do the opposite match
+     *   * collation - Usually i;unicode-casemap
+     *
+     * @var array
+     */
+    public $filters;
+
+    /**
+     * The number of results the client wants
+     *
+     * null means it wasn't specified, which in most cases means 'all results'.
+     *
+     * @var int|null
+     */
+    public $limit;
+
+    /**
+     * Either 'anyof' or 'allof'
+     *
+     * @var string
+     */
+    public $test;
+
+    /**
+     * The mimetype of the content that should be returend. Usually
+     * text/vcard.
+     *
+     * @var string
+     */
+    public $contentType = null;
+
+    /**
+     * The version of vcard data that should be returned. Usually 3.0,
+     * referring to vCard 3.0.
+     *
+     * @var string
+     */
+    public $version = null;
+
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = (array)$reader->parseInnerTree([
+            '{urn:ietf:params:xml:ns:carddav}prop-filter'  => 'Sabre\\CardDAV\\Xml\\Filter\\PropFilter',
+            '{urn:ietf:params:xml:ns:carddav}param-filter' => 'Sabre\\CardDAV\\Xml\\Filter\\ParamFilter',
+            '{urn:ietf:params:xml:ns:carddav}address-data' => 'Sabre\\CardDAV\\Xml\\Filter\\AddressData',
+            '{DAV:}prop'                                   => 'Sabre\\Xml\\Element\\KeyValue',
+        ]);
+
+        $newProps = [
+            'filters'    => null,
+            'properties' => [],
+            'test'       => 'anyof',
+            'limit'      => null,
+        ];
+
+        if (!is_array($elems)) $elems = [];
+
+        foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{DAV:}prop' :
+                    $newProps['properties'] = array_keys($elem['value']);
+                    if (isset($elem['value']['{' . Plugin::NS_CARDDAV . '}address-data'])) {
+                        $newProps += $elem['value']['{' . Plugin::NS_CARDDAV . '}address-data'];
+                    }
+                    break;
+                case '{' . Plugin::NS_CARDDAV . '}filter' :
+
+                    if (!is_null($newProps['filters'])) {
+                        throw new BadRequest('You can only include 1 {' . Plugin::NS_CARDDAV . '}filter element');
+                    }
+                    if (isset($elem['attributes']['test'])) {
+                        $newProps['test'] = $elem['attributes']['test'];
+                        if ($newProps['test'] !== 'allof' && $newProps['test'] !== 'anyof') {
+                            throw new BadRequest('The "test" attribute must be one of "allof" or "anyof"');
+                        }
+                    }
+
+                    $newProps['filters'] = [];
+                    foreach ((array)$elem['value'] as $subElem) {
+                        if ($subElem['name'] === '{' . Plugin::NS_CARDDAV . '}prop-filter') {
+                            $newProps['filters'][] = $subElem['value'];
+                        }
+                    }
+                    break;
+                case '{' . Plugin::NS_CARDDAV . '}limit' :
+                    foreach ($elem['value'] as $child) {
+                        if ($child['name'] === '{' . Plugin::NS_CARDDAV . '}nresults') {
+                            $newProps['limit'] = (int)$child['value'];
+                        }
+                    }
+                    break;
+
+            }
+
+        }
+
+        if (is_null($newProps['filters'])) {
+            /*
+             * We are supposed to throw this error, but KDE sometimes does not
+             * include the filter element, and we need to treat it as if no
+             * filters are supplied
+             */
+            //throw new BadRequest('The {' . Plugin::NS_CARDDAV . '}filter element is required for this request');
+            $newProps['filters'] = [];
+
+        }
+
+        $obj = new self();
+        foreach ($newProps as $key => $value) {
+            $obj->$key = $value;
+        }
+
+        return $obj;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBasic.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBasic.php
new file mode 100644
index 000000000..40a95f8bf
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBasic.php
@@ -0,0 +1,144 @@
+<?php
+
+namespace Sabre\DAV\Auth\Backend;
+
+use Sabre\DAV;
+use Sabre\HTTP;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * HTTP Basic authentication backend class
+ *
+ * This class can be used by authentication objects wishing to use HTTP Basic
+ * Most of the digest logic is handled, implementors just need to worry about
+ * the validateUserPass method.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author James David Low (http://jameslow.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+abstract class AbstractBasic implements BackendInterface {
+
+    /**
+     * Authentication Realm.
+     *
+     * The realm is often displayed by browser clients when showing the
+     * authentication dialog.
+     *
+     * @var string
+     */
+    protected $realm = 'sabre/dav';
+
+    /**
+     * This is the prefix that will be used to generate principal urls.
+     *
+     * @var string
+     */
+    protected $principalPrefix = 'principals/';
+
+    /**
+     * Validates a username and password
+     *
+     * This method should return true or false depending on if login
+     * succeeded.
+     *
+     * @param string $username
+     * @param string $password
+     * @return bool
+     */
+    abstract protected function validateUserPass($username, $password);
+
+    /**
+     * Sets the authentication realm for this backend.
+     *
+     * @param string $realm
+     * @return void
+     */
+    function setRealm($realm) {
+
+        $this->realm = $realm;
+
+    }
+
+    /**
+     * When this method is called, the backend must check if authentication was
+     * successful.
+     *
+     * The returned value must be one of the following
+     *
+     * [true, "principals/username"]
+     * [false, "reason for failure"]
+     *
+     * If authentication was successful, it's expected that the authentication
+     * backend returns a so-called principal url.
+     *
+     * Examples of a principal url:
+     *
+     * principals/admin
+     * principals/user1
+     * principals/users/joe
+     * principals/uid/123457
+     *
+     * If you don't use WebDAV ACL (RFC3744) we recommend that you simply
+     * return a string such as:
+     *
+     * principals/users/[username]
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return array
+     */
+    function check(RequestInterface $request, ResponseInterface $response) {
+
+        $auth = new HTTP\Auth\Basic(
+            $this->realm,
+            $request,
+            $response
+        );
+
+        $userpass = $auth->getCredentials();
+        if (!$userpass) {
+            return [false, "No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured"];
+        }
+        if (!$this->validateUserPass($userpass[0], $userpass[1])) {
+            return [false, "Username or password was incorrect"];
+        }
+        return [true, $this->principalPrefix . $userpass[0]];
+
+    }
+
+    /**
+     * This method is called when a user could not be authenticated, and
+     * authentication was required for the current request.
+     *
+     * This gives you the opportunity to set authentication headers. The 401
+     * status code will already be set.
+     *
+     * In this case of Basic Auth, this would for example mean that the
+     * following header needs to be set:
+     *
+     * $response->addHeader('WWW-Authenticate', 'Basic realm=SabreDAV');
+     *
+     * Keep in mind that in the case of multiple authentication backends, other
+     * WWW-Authenticate headers may already have been set, and you'll want to
+     * append your own WWW-Authenticate header instead of overwriting the
+     * existing one.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function challenge(RequestInterface $request, ResponseInterface $response) {
+
+        $auth = new HTTP\Auth\Basic(
+            $this->realm,
+            $request,
+            $response
+        );
+        $auth->requireLogin();
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBearer.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBearer.php
new file mode 100644
index 000000000..ae7a8a12f
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBearer.php
@@ -0,0 +1,138 @@
+<?php
+
+namespace Sabre\DAV\Auth\Backend;
+
+use Sabre\DAV;
+use Sabre\HTTP;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * HTTP Bearer authentication backend class
+ *
+ * This class can be used by authentication objects wishing to use HTTP Bearer
+ * Most of the digest logic is handled, implementors just need to worry about
+ * the validateBearerToken method.
+ *
+ * @copyright Copyright (C) 2007-2015 fruux GmbH (https://fruux.com/).
+ * @author François Kooman (https://tuxed.net/)
+ * @author James David Low (http://jameslow.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+abstract class AbstractBearer implements BackendInterface {
+
+    /**
+     * Authentication Realm.
+     *
+     * The realm is often displayed by browser clients when showing the
+     * authentication dialog.
+     *
+     * @var string
+     */
+    protected $realm = 'sabre/dav';
+
+    /**
+     * Validates a Bearer token
+     *
+     * This method should return the full principal url, or false if the
+     * token was incorrect.
+     *
+     * @param string $bearerToken
+     * @return string|false
+     */
+    abstract protected function validateBearerToken($bearerToken);
+
+    /**
+     * Sets the authentication realm for this backend.
+     *
+     * @param string $realm
+     * @return void
+     */
+    function setRealm($realm) {
+
+        $this->realm = $realm;
+
+    }
+
+    /**
+     * When this method is called, the backend must check if authentication was
+     * successful.
+     *
+     * The returned value must be one of the following
+     *
+     * [true, "principals/username"]
+     * [false, "reason for failure"]
+     *
+     * If authentication was successful, it's expected that the authentication
+     * backend returns a so-called principal url.
+     *
+     * Examples of a principal url:
+     *
+     * principals/admin
+     * principals/user1
+     * principals/users/joe
+     * principals/uid/123457
+     *
+     * If you don't use WebDAV ACL (RFC3744) we recommend that you simply
+     * return a string such as:
+     *
+     * principals/users/[username]
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return array
+     */
+    function check(RequestInterface $request, ResponseInterface $response) {
+
+        $auth = new HTTP\Auth\Bearer(
+            $this->realm,
+            $request,
+            $response
+        );
+
+        $bearerToken = $auth->getToken($request);
+        if (!$bearerToken) {
+            return [false, "No 'Authorization: Bearer' header found. Either the client didn't send one, or the server is mis-configured"];
+        }
+        $principalUrl = $this->validateBearerToken($bearerToken);
+        if (!$principalUrl) {
+            return [false, "Bearer token was incorrect"];
+        }
+        return [true, $principalUrl];
+
+    }
+
+    /**
+     * This method is called when a user could not be authenticated, and
+     * authentication was required for the current request.
+     *
+     * This gives you the opportunity to set authentication headers. The 401
+     * status code will already be set.
+     *
+     * In this case of Bearer Auth, this would for example mean that the
+     * following header needs to be set:
+     *
+     * $response->addHeader('WWW-Authenticate', 'Bearer realm=SabreDAV');
+     *
+     * Keep in mind that in the case of multiple authentication backends, other
+     * WWW-Authenticate headers may already have been set, and you'll want to
+     * append your own WWW-Authenticate header instead of overwriting the
+     * existing one.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function challenge(RequestInterface $request, ResponseInterface $response) {
+
+        $auth = new HTTP\Auth\Bearer(
+            $this->realm,
+            $request,
+            $response
+        );
+        $auth->requireLogin();
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractDigest.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractDigest.php
new file mode 100644
index 000000000..0251decc1
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractDigest.php
@@ -0,0 +1,162 @@
+<?php
+
+namespace Sabre\DAV\Auth\Backend;
+
+use Sabre\HTTP;
+use Sabre\DAV;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * HTTP Digest authentication backend class
+ *
+ * This class can be used by authentication objects wishing to use HTTP Digest
+ * Most of the digest logic is handled, implementors just need to worry about
+ * the getDigestHash method
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+abstract class AbstractDigest implements BackendInterface {
+
+    /**
+     * Authentication Realm.
+     *
+     * The realm is often displayed by browser clients when showing the
+     * authentication dialog.
+     *
+     * @var string
+     */
+    protected $realm = 'SabreDAV';
+
+    /**
+     * This is the prefix that will be used to generate principal urls.
+     *
+     * @var string
+     */
+    protected $principalPrefix = 'principals/';
+
+    /**
+     * Sets the authentication realm for this backend.
+     *
+     * Be aware that for Digest authentication, the realm influences the digest
+     * hash. Choose the realm wisely, because if you change it later, all the
+     * existing hashes will break and nobody can authenticate.
+     *
+     * @param string $realm
+     * @return void
+     */
+    function setRealm($realm) {
+
+        $this->realm = $realm;
+
+    }
+
+    /**
+     * Returns a users digest hash based on the username and realm.
+     *
+     * If the user was not known, null must be returned.
+     *
+     * @param string $realm
+     * @param string $username
+     * @return string|null
+     */
+    abstract function getDigestHash($realm, $username);
+
+    /**
+     * When this method is called, the backend must check if authentication was
+     * successful.
+     *
+     * The returned value must be one of the following
+     *
+     * [true, "principals/username"]
+     * [false, "reason for failure"]
+     *
+     * If authentication was successful, it's expected that the authentication
+     * backend returns a so-called principal url.
+     *
+     * Examples of a principal url:
+     *
+     * principals/admin
+     * principals/user1
+     * principals/users/joe
+     * principals/uid/123457
+     *
+     * If you don't use WebDAV ACL (RFC3744) we recommend that you simply
+     * return a string such as:
+     *
+     * principals/users/[username]
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return array
+     */
+    function check(RequestInterface $request, ResponseInterface $response) {
+
+        $digest = new HTTP\Auth\Digest(
+            $this->realm,
+            $request,
+            $response
+        );
+        $digest->init();
+
+        $username = $digest->getUsername();
+
+        // No username was given
+        if (!$username) {
+            return [false, "No 'Authorization: Digest' header found. Either the client didn't send one, or the server is misconfigured"];
+        }
+
+        $hash = $this->getDigestHash($this->realm, $username);
+        // If this was false, the user account didn't exist
+        if ($hash === false || is_null($hash)) {
+            return [false, "Username or password was incorrect"];
+        }
+        if (!is_string($hash)) {
+            throw new DAV\Exception('The returned value from getDigestHash must be a string or null');
+        }
+
+        // If this was false, the password or part of the hash was incorrect.
+        if (!$digest->validateA1($hash)) {
+            return [false, "Username or password was incorrect"];
+        }
+
+        return [true, $this->principalPrefix . $username];
+
+    }
+
+    /**
+     * This method is called when a user could not be authenticated, and
+     * authentication was required for the current request.
+     *
+     * This gives you the opportunity to set authentication headers. The 401
+     * status code will already be set.
+     *
+     * In this case of Basic Auth, this would for example mean that the
+     * following header needs to be set:
+     *
+     * $response->addHeader('WWW-Authenticate', 'Basic realm=SabreDAV');
+     *
+     * Keep in mind that in the case of multiple authentication backends, other
+     * WWW-Authenticate headers may already have been set, and you'll want to
+     * append your own WWW-Authenticate header instead of overwriting the
+     * existing one.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function challenge(RequestInterface $request, ResponseInterface $response) {
+
+        $auth = new HTTP\Auth\Digest(
+            $this->realm,
+            $request,
+            $response
+        );
+        $auth->init();
+        $auth->requireLogin();
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/Apache.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/Apache.php
new file mode 100644
index 000000000..e203d2685
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/Apache.php
@@ -0,0 +1,96 @@
+<?php
+
+namespace Sabre\DAV\Auth\Backend;
+
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * Apache authenticator
+ *
+ * This authentication backend assumes that authentication has been
+ * configured in apache, rather than within SabreDAV.
+ *
+ * Make sure apache is properly configured for this to work.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Apache implements BackendInterface {
+
+    /**
+     * This is the prefix that will be used to generate principal urls.
+     *
+     * @var string
+     */
+    protected $principalPrefix = 'principals/';
+
+    /**
+     * When this method is called, the backend must check if authentication was
+     * successful.
+     *
+     * The returned value must be one of the following
+     *
+     * [true, "principals/username"]
+     * [false, "reason for failure"]
+     *
+     * If authentication was successful, it's expected that the authentication
+     * backend returns a so-called principal url.
+     *
+     * Examples of a principal url:
+     *
+     * principals/admin
+     * principals/user1
+     * principals/users/joe
+     * principals/uid/123457
+     *
+     * If you don't use WebDAV ACL (RFC3744) we recommend that you simply
+     * return a string such as:
+     *
+     * principals/users/[username]
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return array
+     */
+    function check(RequestInterface $request, ResponseInterface $response) {
+
+        $remoteUser = $request->getRawServerValue('REMOTE_USER');
+        if (is_null($remoteUser)) {
+            $remoteUser = $request->getRawServerValue('REDIRECT_REMOTE_USER');
+        }
+        if (is_null($remoteUser)) {
+            return [false, 'No REMOTE_USER property was found in the PHP $_SERVER super-global. This likely means your server is not configured correctly'];
+        }
+
+        return [true, $this->principalPrefix . $remoteUser];
+
+    }
+
+    /**
+     * This method is called when a user could not be authenticated, and
+     * authentication was required for the current request.
+     *
+     * This gives you the opportunity to set authentication headers. The 401
+     * status code will already be set.
+     *
+     * In this case of Basic Auth, this would for example mean that the
+     * following header needs to be set:
+     *
+     * $response->addHeader('WWW-Authenticate', 'Basic realm=SabreDAV');
+     *
+     * Keep in mind that in the case of multiple authentication backends, other
+     * WWW-Authenticate headers may already have been set, and you'll want to
+     * append your own WWW-Authenticate header instead of overwriting the
+     * existing one.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function challenge(RequestInterface $request, ResponseInterface $response) {
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/BackendInterface.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/BackendInterface.php
new file mode 100644
index 000000000..0fb2210f4
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/BackendInterface.php
@@ -0,0 +1,70 @@
+<?php
+
+namespace Sabre\DAV\Auth\Backend;
+
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * This is the base class for any authentication object.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface BackendInterface {
+
+    /**
+     * When this method is called, the backend must check if authentication was
+     * successful.
+     *
+     * The returned value must be one of the following
+     *
+     * [true, "principals/username"]
+     * [false, "reason for failure"]
+     *
+     * If authentication was successful, it's expected that the authentication
+     * backend returns a so-called principal url.
+     *
+     * Examples of a principal url:
+     *
+     * principals/admin
+     * principals/user1
+     * principals/users/joe
+     * principals/uid/123457
+     *
+     * If you don't use WebDAV ACL (RFC3744) we recommend that you simply
+     * return a string such as:
+     *
+     * principals/users/[username]
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return array
+     */
+    function check(RequestInterface $request, ResponseInterface $response);
+
+    /**
+     * This method is called when a user could not be authenticated, and
+     * authentication was required for the current request.
+     *
+     * This gives you the opportunity to set authentication headers. The 401
+     * status code will already be set.
+     *
+     * In this case of Basic Auth, this would for example mean that the
+     * following header needs to be set:
+     *
+     * $response->addHeader('WWW-Authenticate', 'Basic realm=SabreDAV');
+     *
+     * Keep in mind that in the case of multiple authentication backends, other
+     * WWW-Authenticate headers may already have been set, and you'll want to
+     * append your own WWW-Authenticate header instead of overwriting the
+     * existing one.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function challenge(RequestInterface $request, ResponseInterface $response);
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/BasicCallBack.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/BasicCallBack.php
new file mode 100644
index 000000000..7ad8f48b2
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/BasicCallBack.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace Sabre\DAV\Auth\Backend;
+
+/**
+ * Extremely simply HTTP Basic auth backend.
+ *
+ * This backend basically works by calling a callback, which receives a
+ * username and password.
+ * The callback must return true or false depending on if authentication was
+ * correct.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class BasicCallBack extends AbstractBasic {
+
+    /**
+     * Callback
+     *
+     * @var callable
+     */
+    protected $callBack;
+
+    /**
+     * Creates the backend.
+     *
+     * A callback must be provided to handle checking the username and
+     * password.
+     *
+     * @param callable $callBack
+     * @return void
+     */
+    function __construct(callable $callBack) {
+
+        $this->callBack = $callBack;
+
+    }
+
+    /**
+     * Validates a username and password
+     *
+     * This method should return true or false depending on if login
+     * succeeded.
+     *
+     * @param string $username
+     * @param string $password
+     * @return bool
+     */
+    protected function validateUserPass($username, $password) {
+
+        $cb = $this->callBack;
+        return $cb($username, $password);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/File.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/File.php
index a8e913614..6756e68df 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/File.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/File.php
@@ -9,7 +9,7 @@ use Sabre\DAV;
  *
  * The backend file must conform to Apache's htdigest format
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -20,7 +20,7 @@ class File extends AbstractDigest {
      *
      * @var array
      */
-    protected $users = array();
+    protected $users = [];
 
     /**
      * Creates the backend object.
@@ -29,7 +29,7 @@ class File extends AbstractDigest {
      *
      * @param string|null $filename
      */
-    public function __construct($filename=null) {
+    function __construct($filename = null) {
 
         if (!is_null($filename))
             $this->loadFile($filename);
@@ -43,14 +43,14 @@ class File extends AbstractDigest {
      * @param string $filename
      * @return void
      */
-    public function loadFile($filename) {
+    function loadFile($filename) {
 
-        foreach(file($filename,FILE_IGNORE_NEW_LINES) as $line) {
+        foreach (file($filename, FILE_IGNORE_NEW_LINES) as $line) {
 
             if (substr_count($line, ":") !== 2)
                 throw new DAV\Exception('Malformed htdigest file. Every line should contain 2 colons');
 
-            list($username,$realm,$A1) = explode(':',$line);
+            list($username, $realm, $A1) = explode(':', $line);
 
             if (!preg_match('/^[a-zA-Z0-9]{32}$/', $A1))
                 throw new DAV\Exception('Malformed htdigest file. Invalid md5 hash');
@@ -68,9 +68,9 @@ class File extends AbstractDigest {
      * @param string $username
      * @return string
      */
-    public function getDigestHash($realm, $username) {
+    function getDigestHash($realm, $username) {
 
-        return isset($this->users[$realm . ':' . $username])?$this->users[$realm . ':' . $username]:false;
+        return isset($this->users[$realm . ':' . $username]) ? $this->users[$realm . ':' . $username] : false;
 
     }
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/PDO.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/PDO.php
index f153d8429..76ad89391 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/PDO.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/PDO.php
@@ -3,11 +3,9 @@
 namespace Sabre\DAV\Auth\Backend;
 
 /**
- * This is an authentication backend that uses a file to manage passwords.
+ * This is an authentication backend that uses a database to manage passwords.
  *
- * The backend file must conform to Apache's htdigest format
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -25,7 +23,7 @@ class PDO extends AbstractDigest {
      *
      * @var string
      */
-    protected $tableName;
+    public $tableName = 'users';
 
 
     /**
@@ -34,12 +32,10 @@ class PDO extends AbstractDigest {
      * If the filename argument is passed in, it will parse out the specified file fist.
      *
      * @param PDO $pdo
-     * @param string $tableName The PDO table name to use
      */
-    public function __construct(\PDO $pdo, $tableName = 'users') {
+    function __construct(\PDO $pdo) {
 
         $this->pdo = $pdo;
-        $this->tableName = $tableName;
 
     }
 
@@ -50,15 +46,11 @@ class PDO extends AbstractDigest {
      * @param string $username
      * @return string|null
      */
-    public function getDigestHash($realm,$username) {
-
-        $stmt = $this->pdo->prepare('SELECT username, digesta1 FROM '.$this->tableName.' WHERE username = ?');
-        $stmt->execute(array($username));
-        $result = $stmt->fetchAll();
-
-        if (!count($result)) return;
+    function getDigestHash($realm, $username) {
 
-        return $result[0]['digesta1'];
+        $stmt = $this->pdo->prepare('SELECT digesta1 FROM ' . $this->tableName . ' WHERE username = ?');
+        $stmt->execute([$username]);
+        return $stmt->fetchColumn() ?: null;
 
     }
 
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Plugin.php b/vendor/sabre/dav/lib/DAV/Auth/Plugin.php
new file mode 100644
index 000000000..818d8a4ad
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Auth/Plugin.php
@@ -0,0 +1,213 @@
+<?php
+
+namespace Sabre\DAV\Auth;
+
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Sabre\HTTP\URLUtil;
+use Sabre\DAV\Exception\NotAuthenticated;
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+
+/**
+ * This plugin provides Authentication for a WebDAV server.
+ *
+ * It works by providing a Auth\Backend class. Several examples of these
+ * classes can be found in the Backend directory.
+ *
+ * It's possible to provide more than one backend to this plugin. If more than
+ * one backend was provided, each backend will attempt to authenticate. Only if
+ * all backends fail, we throw a 401.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends ServerPlugin {
+
+    /**
+     * authentication backends
+     */
+    protected $backends;
+
+    /**
+     * The currently logged in principal. Will be `null` if nobody is currently
+     * logged in.
+     *
+     * @var string|null
+     */
+    protected $currentPrincipal;
+
+    /**
+     * Creates the authentication plugin
+     *
+     * @param Backend\BackendInterface $authBackend
+     */
+    function __construct(Backend\BackendInterface $authBackend = null) {
+
+        if (!is_null($authBackend)) {
+            $this->addBackend($authBackend);
+        }
+
+    }
+
+    /**
+     * Adds an authentication backend to the plugin.
+     *
+     * @param Backend\BackendInterface $authBackend
+     * @return void
+     */
+    function addBackend(Backend\BackendInterface $authBackend) {
+
+        $this->backends[] = $authBackend;
+
+    }
+
+    /**
+     * Initializes the plugin. This function is automatically called by the server
+     *
+     * @param Server $server
+     * @return void
+     */
+    function initialize(Server $server) {
+
+        $server->on('beforeMethod', [$this, 'beforeMethod'], 10);
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'auth';
+
+    }
+
+    /**
+     * Returns the currently logged-in principal.
+     *
+     * This will return a string such as:
+     *
+     * principals/username
+     * principals/users/username
+     *
+     * This method will return null if nobody is logged in.
+     *
+     * @return string|null
+     */
+    function getCurrentPrincipal() {
+
+        return $this->currentPrincipal;
+
+    }
+
+    /**
+     * Returns the current username.
+     *
+     * This method is deprecated and is only kept for backwards compatibility
+     * purposes. Please switch to getCurrentPrincipal().
+     *
+     * @deprecated Will be removed in a future version!
+     * @return string|null
+     */
+    function getCurrentUser() {
+
+        // We just do a 'basename' on the principal to give back a sane value
+        // here.
+        list(, $userName) = URLUtil::splitPath(
+            $this->getCurrentPrincipal()
+        );
+
+        return $userName;
+
+    }
+
+    /**
+     * This method is called before any HTTP method and forces users to be authenticated
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function beforeMethod(RequestInterface $request, ResponseInterface $response) {
+
+        if ($this->currentPrincipal) {
+
+            // We already have authentication information. This means that the
+            // event has already fired earlier, and is now likely fired for a
+            // sub-request.
+            //
+            // We don't want to authenticate users twice, so we simply don't do
+            // anything here. See Issue #700 for additional reasoning.
+            //
+            // This is not a perfect solution, but will be fixed once the
+            // "currently authenticated principal" is information that's not
+            // not associated with the plugin, but rather per-request.
+            //
+            // See issue #580 for more information about that.
+            return;
+
+        }
+        if (!$this->backends) {
+            throw new \Sabre\DAV\Exception('No authentication backends were configured on this server.');
+        }
+        $reasons = [];
+        foreach ($this->backends as $backend) {
+
+            $result = $backend->check(
+                $request,
+                $response
+            );
+
+            if (!is_array($result) || count($result) !== 2 || !is_bool($result[0]) || !is_string($result[1])) {
+                throw new \Sabre\DAV\Exception('The authentication backend did not return a correct value from the check() method.');
+            }
+
+            if ($result[0]) {
+                $this->currentPrincipal = $result[1];
+                // Exit early
+                return;
+            }
+            $reasons[] = $result[1];
+
+        }
+
+        // If we got here, it means that no authentication backend was
+        // successful in authenticating the user.
+        $this->currentPrincipal = null;
+
+        foreach ($this->backends as $backend) {
+            $backend->challenge($request, $response);
+        }
+        throw new NotAuthenticated(implode(', ', $reasons));
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Generic authentication plugin',
+            'link'        => 'http://sabre.io/dav/authentication/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/GuessContentType.php b/vendor/sabre/dav/lib/DAV/Browser/GuessContentType.php
index 9fd47b930..01cddc230 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/GuessContentType.php
+++ b/vendor/sabre/dav/lib/DAV/Browser/GuessContentType.php
@@ -2,7 +2,10 @@
 
 namespace Sabre\DAV\Browser;
 
+use Sabre\HTTP\URLUtil;
 use Sabre\DAV;
+use Sabre\DAV\PropFind;
+use Sabre\DAV\Inode;
 
 /**
  * GuessContentType plugin
@@ -15,7 +18,7 @@ use Sabre\DAV;
  * so this extension does what the rest of the world does, and guesses it based
  * on the file extension.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -28,7 +31,7 @@ class GuessContentType extends DAV\ServerPlugin {
      *
      * @var array
      */
-    public $extensionMap = array(
+    public $extensionMap = [
 
         // images
         'jpg' => 'image/jpeg',
@@ -37,12 +40,12 @@ class GuessContentType extends DAV\ServerPlugin {
 
         // groupware
         'ics' => 'text/calendar',
-        'vcf' => 'text/x-vcard',
+        'vcf' => 'text/vcard',
 
         // text
         'txt' => 'text/plain',
 
-    );
+    ];
 
     /**
      * Initializes the plugin
@@ -50,34 +53,31 @@ class GuessContentType extends DAV\ServerPlugin {
      * @param DAV\Server $server
      * @return void
      */
-    public function initialize(DAV\Server $server) {
+    function initialize(DAV\Server $server) {
 
         // Using a relatively low priority (200) to allow other extensions
         // to set the content-type first.
-        $server->subscribeEvent('afterGetProperties',array($this,'afterGetProperties'),200);
+        $server->on('propFind', [$this, 'propFind'], 200);
 
     }
 
     /**
-     * Handler for teh afterGetProperties event
+     * Our PROPFIND handler
      *
-     * @param string $path
-     * @param array $properties
+     * Here we set a contenttype, if the node didn't already have one.
+     *
+     * @param PropFind $propFind
+     * @param INode $node
      * @return void
      */
-    public function afterGetProperties($path, &$properties) {
-
-        if (array_key_exists('{DAV:}getcontenttype', $properties[404])) {
+    function propFind(PropFind $propFind, INode $node) {
 
-            list(, $fileName) = DAV\URLUtil::splitPath($path);
-            $contentType = $this->getContentType($fileName);
+        $propFind->handle('{DAV:}getcontenttype', function() use ($propFind) {
 
-            if ($contentType) {
-                $properties[200]['{DAV:}getcontenttype'] = $contentType;
-                unset($properties[404]['{DAV:}getcontenttype']);
-            }
+            list(, $fileName) = URLUtil::splitPath($propFind->getPath());
+            return $this->getContentType($fileName);
 
-        }
+        });
 
     }
 
@@ -90,9 +90,11 @@ class GuessContentType extends DAV\ServerPlugin {
     protected function getContentType($fileName) {
 
         // Just grabbing the extension
-        $extension = strtolower(substr($fileName,strrpos($fileName,'.')+1));
-        if (isset($this->extensionMap[$extension]))
+        $extension = strtolower(substr($fileName, strrpos($fileName, '.') + 1));
+        if (isset($this->extensionMap[$extension])) {
             return $this->extensionMap[$extension];
+        }
+        return 'application/octet-stream';
 
     }
 
diff --git a/vendor/sabre/dav/lib/DAV/Browser/HtmlOutput.php b/vendor/sabre/dav/lib/DAV/Browser/HtmlOutput.php
new file mode 100644
index 000000000..f4be6b348
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/HtmlOutput.php
@@ -0,0 +1,34 @@
+<?php
+
+namespace Sabre\DAV\Browser;
+
+/**
+ * WebDAV properties that implement this interface are able to generate their
+ * own html output for the browser plugin.
+ *
+ * This is only useful for display purposes, and might make it a bit easier for
+ * people to read and understand the value of some properties.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface HtmlOutput {
+
+    /**
+     * Generate html representation for this value.
+     *
+     * The html output is 100% trusted, and no effort is being made to sanitize
+     * it. It's up to the implementor to sanitize user provided values.
+     *
+     * The output must be in UTF-8.
+     *
+     * The baseUri parameter is a url to the root of the application, and can
+     * be used to construct local links.
+     *
+     * @param HtmlOutputHelper $html
+     * @return string
+     */
+    function toHtml(HtmlOutputHelper $html);
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Browser/HtmlOutputHelper.php b/vendor/sabre/dav/lib/DAV/Browser/HtmlOutputHelper.php
new file mode 100644
index 000000000..249d54047
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/HtmlOutputHelper.php
@@ -0,0 +1,117 @@
+<?php
+
+namespace Sabre\DAV\Browser;
+
+use Sabre\Uri;
+use Sabre\Xml\Service as XmlService;
+
+/**
+ * This class provides a few utility functions for easily generating HTML for
+ * the browser plugin.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class HtmlOutputHelper {
+
+    /**
+     * Link to the root of the application.
+     *
+     * @var string
+     */
+    protected $baseUri;
+
+    /**
+     * List of xml namespaces.
+     *
+     * @var array
+     */
+    protected $namespaceMap;
+
+    /**
+     * Creates the object.
+     *
+     * baseUri must point to the root of the application. This will be used to
+     * easily generate links.
+     *
+     * The namespaceMap contains an array with the list of xml namespaces and
+     * their prefixes. WebDAV uses a lot of XML with complex namespaces, so
+     * that can be used to make output a lot shorter.
+     *
+     * @param string $baseUri
+     * @param array $namespaceMap
+     */
+    function __construct($baseUri, array $namespaceMap) {
+
+        $this->baseUri = $baseUri;
+        $this->namespaceMap = $namespaceMap;
+
+    }
+
+    /**
+     * Generates a 'full' url based on a relative one.
+     *
+     * For relative urls, the base of the application is taken as the reference
+     * url, not the 'current url of the current request'.
+     *
+     * Absolute urls are left alone.
+     *
+     * @param string $path
+     * @return string
+     */
+    function fullUrl($path) {
+
+        return Uri\resolve($this->baseUri, $path);
+
+    }
+
+    /**
+     * Escape string for HTML output.
+     *
+     * @param string $input
+     * @return string
+     */
+    function h($input) {
+
+        return htmlspecialchars($input, ENT_COMPAT, 'UTF-8');
+
+    }
+
+    /**
+     * Generates a full <a>-tag.
+     *
+     * Url is automatically expanded. If label is not specified, we re-use the
+     * url.
+     *
+     * @param string $url
+     * @param string $label
+     * @return string
+     */
+    function link($url, $label = null) {
+
+        $url = $this->h($this->fullUrl($url));
+        return '<a href="' . $url . '">' . ($label ? $this->h($label) : $url) . '</a>';
+
+    }
+
+    /**
+     * This method takes an xml element in clark-notation, and turns it into a
+     * shortened version with a prefix, if it was a known namespace.
+     *
+     * @param string $element
+     * @return string
+     */
+    function xmlName($element) {
+
+        list($ns, $localName) = XmlService::parseClarkNotation($element);
+        if (isset($this->namespaceMap[$ns])) {
+            $propName = $this->namespaceMap[$ns] . ':' . $localName;
+        } else {
+            $propName = $element;
+        }
+        return "<span title=\"" . $this->h($element) . "\">" . $this->h($propName) . "</span>";
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/MapGetToPropFind.php b/vendor/sabre/dav/lib/DAV/Browser/MapGetToPropFind.php
index 881c063b9..38ee63bcd 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/MapGetToPropFind.php
+++ b/vendor/sabre/dav/lib/DAV/Browser/MapGetToPropFind.php
@@ -3,6 +3,8 @@
 namespace Sabre\DAV\Browser;
 
 use Sabre\DAV;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
 
 /**
  * This is a simple plugin that will map any GET request for non-files to
@@ -10,7 +12,7 @@ use Sabre\DAV;
  *
  * This should allow easy debugging of PROPFIND
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -29,27 +31,28 @@ class MapGetToPropFind extends DAV\ServerPlugin {
      * @param DAV\Server $server
      * @return void
      */
-    public function initialize(DAV\Server $server) {
+    function initialize(DAV\Server $server) {
 
         $this->server = $server;
-        $this->server->subscribeEvent('beforeMethod',array($this,'httpGetInterceptor'));
+        $this->server->on('method:GET', [$this, 'httpGet'], 90);
     }
 
     /**
      * This method intercepts GET requests to non-files, and changes it into an HTTP PROPFIND request
      *
-     * @param string $method
-     * @param string $uri
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
      * @return bool
      */
-    public function httpGetInterceptor($method, $uri) {
+    function httpGet(RequestInterface $request, ResponseInterface $response) {
 
-        if ($method!='GET') return true;
-
-        $node = $this->server->tree->getNodeForPath($uri);
+        $node = $this->server->tree->getNodeForPath($request->getPath());
         if ($node instanceof DAV\IFile) return;
 
-        $this->server->invokeMethod('PROPFIND',$uri);
+        $subRequest = clone $request;
+        $subRequest->setMethod('PROPFIND');
+
+        $this->server->invokeMethod($subRequest, $response);
         return false;
 
     }
diff --git a/vendor/sabre/dav/lib/DAV/Browser/Plugin.php b/vendor/sabre/dav/lib/DAV/Browser/Plugin.php
new file mode 100644
index 000000000..07ca6c3e5
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/Plugin.php
@@ -0,0 +1,797 @@
+<?php
+
+namespace Sabre\DAV\Browser;
+
+use Sabre\DAV;
+use Sabre\DAV\MkCol;
+use Sabre\HTTP\URLUtil;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * Browser Plugin
+ *
+ * This plugin provides a html representation, so that a WebDAV server may be accessed
+ * using a browser.
+ *
+ * The class intercepts GET requests to collection resources and generates a simple
+ * html index.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends DAV\ServerPlugin {
+
+    /**
+     * reference to server class
+     *
+     * @var Sabre\DAV\Server
+     */
+    protected $server;
+
+    /**
+     * enablePost turns on the 'actions' panel, which allows people to create
+     * folders and upload files straight from a browser.
+     *
+     * @var bool
+     */
+    protected $enablePost = true;
+
+    /**
+     * A list of properties that are usually not interesting. This can cut down
+     * the browser output a bit by removing the properties that most people
+     * will likely not want to see.
+     *
+     * @var array
+     */
+    public $uninterestingProperties = [
+        '{DAV:}supportedlock',
+        '{DAV:}acl-restrictions',
+        '{DAV:}supported-privilege-set',
+        '{DAV:}supported-method-set',
+    ];
+
+    /**
+     * Creates the object.
+     *
+     * By default it will allow file creation and uploads.
+     * Specify the first argument as false to disable this
+     *
+     * @param bool $enablePost
+     */
+    function __construct($enablePost = true) {
+
+        $this->enablePost = $enablePost;
+
+    }
+
+    /**
+     * Initializes the plugin and subscribes to events
+     *
+     * @param DAV\Server $server
+     * @return void
+     */
+    function initialize(DAV\Server $server) {
+
+        $this->server = $server;
+        $this->server->on('method:GET', [$this, 'httpGetEarly'], 90);
+        $this->server->on('method:GET', [$this, 'httpGet'], 200);
+        $this->server->on('onHTMLActionsPanel', [$this, 'htmlActionsPanel'], 200);
+        if ($this->enablePost) $this->server->on('method:POST', [$this, 'httpPOST']);
+    }
+
+    /**
+     * This method intercepts GET requests that have ?sabreAction=info
+     * appended to the URL
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpGetEarly(RequestInterface $request, ResponseInterface $response) {
+
+        $params = $request->getQueryParameters();
+        if (isset($params['sabreAction']) && $params['sabreAction'] === 'info') {
+            return $this->httpGet($request, $response);
+        }
+
+    }
+
+    /**
+     * This method intercepts GET requests to collections and returns the html
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpGet(RequestInterface $request, ResponseInterface $response) {
+
+        // We're not using straight-up $_GET, because we want everything to be
+        // unit testable.
+        $getVars = $request->getQueryParameters();
+
+        // CSP headers
+        $this->server->httpResponse->setHeader('Content-Security-Policy', "img-src 'self'; style-src 'self';");
+
+        $sabreAction = isset($getVars['sabreAction']) ? $getVars['sabreAction'] : null;
+
+        switch ($sabreAction) {
+
+            case 'asset' :
+                // Asset handling, such as images
+                $this->serveAsset(isset($getVars['assetName']) ? $getVars['assetName'] : null);
+                return false;
+            default :
+            case 'info' :
+                try {
+                    $this->server->tree->getNodeForPath($request->getPath());
+                } catch (DAV\Exception\NotFound $e) {
+                    // We're simply stopping when the file isn't found to not interfere
+                    // with other plugins.
+                    return;
+                }
+
+                $response->setStatus(200);
+                $response->setHeader('Content-Type', 'text/html; charset=utf-8');
+
+                $response->setBody(
+                    $this->generateDirectoryIndex($request->getPath())
+                );
+
+                return false;
+
+            case 'plugins' :
+                $response->setStatus(200);
+                $response->setHeader('Content-Type', 'text/html; charset=utf-8');
+
+                $response->setBody(
+                    $this->generatePluginListing()
+                );
+
+                return false;
+
+        }
+
+    }
+
+    /**
+     * Handles POST requests for tree operations.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpPOST(RequestInterface $request, ResponseInterface $response) {
+
+        $contentType = $request->getHeader('Content-Type');
+        list($contentType) = explode(';', $contentType);
+        if ($contentType !== 'application/x-www-form-urlencoded' &&
+            $contentType !== 'multipart/form-data') {
+                return;
+        }
+        $postVars = $request->getPostData();
+
+        if (!isset($postVars['sabreAction']))
+            return;
+
+        $uri = $request->getPath();
+
+        if ($this->server->emit('onBrowserPostAction', [$uri, $postVars['sabreAction'], $postVars])) {
+
+            switch ($postVars['sabreAction']) {
+
+                case 'mkcol' :
+                    if (isset($postVars['name']) && trim($postVars['name'])) {
+                        // Using basename() because we won't allow slashes
+                        list(, $folderName) = URLUtil::splitPath(trim($postVars['name']));
+
+                        if (isset($postVars['resourceType'])) {
+                            $resourceType = explode(',', $postVars['resourceType']);
+                        } else {
+                            $resourceType = ['{DAV:}collection'];
+                        }
+
+                        $properties = [];
+                        foreach ($postVars as $varName => $varValue) {
+                            // Any _POST variable in clark notation is treated
+                            // like a property.
+                            if ($varName[0] === '{') {
+                                // PHP will convert any dots to underscores.
+                                // This leaves us with no way to differentiate
+                                // the two.
+                                // Therefore we replace the string *DOT* with a
+                                // real dot. * is not allowed in uris so we
+                                // should be good.
+                                $varName = str_replace('*DOT*', '.', $varName);
+                                $properties[$varName] = $varValue;
+                            }
+                        }
+
+                        $mkCol = new MkCol(
+                            $resourceType,
+                            $properties
+                        );
+                        $this->server->createCollection($uri . '/' . $folderName, $mkCol);
+                    }
+                    break;
+
+                // @codeCoverageIgnoreStart
+                case 'put' :
+
+                    if ($_FILES) $file = current($_FILES);
+                    else break;
+
+                    list(, $newName) = URLUtil::splitPath(trim($file['name']));
+                    if (isset($postVars['name']) && trim($postVars['name']))
+                        $newName = trim($postVars['name']);
+
+                    // Making sure we only have a 'basename' component
+                    list(, $newName) = URLUtil::splitPath($newName);
+
+                    if (is_uploaded_file($file['tmp_name'])) {
+                        $this->server->createFile($uri . '/' . $newName, fopen($file['tmp_name'], 'r'));
+                    }
+                    break;
+                // @codeCoverageIgnoreEnd
+
+            }
+
+        }
+        $response->setHeader('Location', $request->getUrl());
+        $response->setStatus(302);
+        return false;
+
+    }
+
+    /**
+     * Escapes a string for html.
+     *
+     * @param string $value
+     * @return string
+     */
+    function escapeHTML($value) {
+
+        return htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
+
+    }
+
+    /**
+     * Generates the html directory index for a given url
+     *
+     * @param string $path
+     * @return string
+     */
+    function generateDirectoryIndex($path) {
+
+        $html = $this->generateHeader($path ? $path : '/', $path);
+
+        $node = $this->server->tree->getNodeForPath($path);
+        if ($node instanceof DAV\ICollection) {
+
+            $html .= "<section><h1>Nodes</h1>\n";
+            $html .= "<table class=\"nodeTable\">";
+
+            $subNodes = $this->server->getPropertiesForChildren($path, [
+                '{DAV:}displayname',
+                '{DAV:}resourcetype',
+                '{DAV:}getcontenttype',
+                '{DAV:}getcontentlength',
+                '{DAV:}getlastmodified',
+            ]);
+
+            foreach ($subNodes as $subPath => $subProps) {
+
+                $subNode = $this->server->tree->getNodeForPath($subPath);
+                $fullPath = $this->server->getBaseUri() . URLUtil::encodePath($subPath);
+                list(, $displayPath) = URLUtil::splitPath($subPath);
+
+                $subNodes[$subPath]['subNode'] = $subNode;
+                $subNodes[$subPath]['fullPath'] = $fullPath;
+                $subNodes[$subPath]['displayPath'] = $displayPath;
+            }
+            uasort($subNodes, [$this, 'compareNodes']);
+
+            foreach ($subNodes as $subProps) {
+                $type = [
+                    'string' => 'Unknown',
+                    'icon'   => 'cog',
+                ];
+                if (isset($subProps['{DAV:}resourcetype'])) {
+                    $type = $this->mapResourceType($subProps['{DAV:}resourcetype']->getValue(), $subProps['subNode']);
+                }
+
+                $html .= '<tr>';
+                $html .= '<td class="nameColumn"><a href="' . $this->escapeHTML($subProps['fullPath']) . '"><span class="oi" data-glyph="' . $this->escapeHTML($type['icon']) . '"></span> ' . $this->escapeHTML($subProps['displayPath']) . '</a></td>';
+                $html .= '<td class="typeColumn">' . $this->escapeHTML($type['string']) . '</td>';
+                $html .= '<td>';
+                if (isset($subProps['{DAV:}getcontentlength'])) {
+                    $html .= $this->escapeHTML($subProps['{DAV:}getcontentlength'] . ' bytes');
+                }
+                $html .= '</td><td>';
+                if (isset($subProps['{DAV:}getlastmodified'])) {
+                    $lastMod = $subProps['{DAV:}getlastmodified']->getTime();
+                    $html .= $this->escapeHTML($lastMod->format('F j, Y, g:i a'));
+                }
+                $html .= '</td>';
+
+                $buttonActions = '';
+                if ($subProps['subNode'] instanceof DAV\IFile) {
+                    $buttonActions =  '<a href="' . $this->escapeHTML($subProps['fullPath']) . '?sabreAction=info"><span class="oi" data-glyph="info"></span></a>';
+                }
+                $this->server->emit('browserButtonActions', [$subProps['fullPath'], $subProps['subNode'], &$buttonActions]);
+
+                $html .= '<td>' . $buttonActions . '</td>';
+                $html .= '</tr>';
+            }
+
+            $html .= '</table>';
+
+        }
+
+        $html .= "</section>";
+        $html .= "<section><h1>Properties</h1>";
+        $html .= "<table class=\"propTable\">";
+
+        // Allprops request
+        $propFind = new PropFindAll($path);
+        $properties = $this->server->getPropertiesByNode($propFind, $node);
+
+        $properties = $propFind->getResultForMultiStatus()[200];
+
+        foreach ($properties as $propName => $propValue) {
+            if (!in_array($propName, $this->uninterestingProperties)) {
+                $html .= $this->drawPropertyRow($propName, $propValue);
+            }
+
+        }
+
+
+        $html .= "</table>";
+        $html .= "</section>";
+
+        /* Start of generating actions */
+
+        $output = '';
+        if ($this->enablePost) {
+            $this->server->emit('onHTMLActionsPanel', [$node, &$output]);
+        }
+
+        if ($output) {
+
+            $html .= "<section><h1>Actions</h1>";
+            $html .= "<div class=\"actions\">\n";
+            $html .= $output;
+            $html .= "</div>\n";
+            $html .= "</section>\n";
+        }
+
+        $html .= $this->generateFooter();
+
+        $this->server->httpResponse->setHeader('Content-Security-Policy', "img-src 'self'; style-src 'self';");
+
+        return $html;
+
+    }
+
+    /**
+     * Generates the 'plugins' page.
+     *
+     * @return string
+     */
+    function generatePluginListing() {
+
+        $html = $this->generateHeader('Plugins');
+
+        $html .= "<section><h1>Plugins</h1>";
+        $html .= "<table class=\"propTable\">";
+        foreach ($this->server->getPlugins() as $plugin) {
+            $info = $plugin->getPluginInfo();
+            $html .= '<tr><th>' . $info['name'] . '</th>';
+            $html .= '<td>' . $info['description'] . '</td>';
+            $html .= '<td>';
+            if (isset($info['link']) && $info['link']) {
+                $html .= '<a href="' . $this->escapeHTML($info['link']) . '"><span class="oi" data-glyph="book"></span></a>';
+            }
+            $html .= '</td></tr>';
+        }
+        $html .= "</table>";
+        $html .= "</section>";
+
+        /* Start of generating actions */
+
+        $html .= $this->generateFooter();
+
+        return $html;
+
+    }
+
+    /**
+     * Generates the first block of HTML, including the <head> tag and page
+     * header.
+     *
+     * Returns footer.
+     *
+     * @param string $title
+     * @param string $path
+     * @return void
+     */
+    function generateHeader($title, $path = null) {
+
+        $version = DAV\Version::VERSION;
+
+        $vars = [
+            'title'     => $this->escapeHTML($title),
+            'favicon'   => $this->escapeHTML($this->getAssetUrl('favicon.ico')),
+            'style'     => $this->escapeHTML($this->getAssetUrl('sabredav.css')),
+            'iconstyle' => $this->escapeHTML($this->getAssetUrl('openiconic/open-iconic.css')),
+            'logo'      => $this->escapeHTML($this->getAssetUrl('sabredav.png')),
+            'baseUrl'   => $this->server->getBaseUri(),
+        ];
+
+        $html = <<<HTML
+<!DOCTYPE html>
+<html>
+<head>
+    <title>$vars[title] - sabre/dav $version</title>
+    <link rel="shortcut icon" href="$vars[favicon]"   type="image/vnd.microsoft.icon" />
+    <link rel="stylesheet"    href="$vars[style]"     type="text/css" />
+    <link rel="stylesheet"    href="$vars[iconstyle]" type="text/css" />
+
+</head>
+<body>
+    <header>
+        <div class="logo">
+            <a href="$vars[baseUrl]"><img src="$vars[logo]" alt="sabre/dav" /> $vars[title]</a>
+        </div>
+    </header>
+
+    <nav>
+HTML;
+
+        // If the path is empty, there's no parent.
+        if ($path)  {
+            list($parentUri) = URLUtil::splitPath($path);
+            $fullPath = $this->server->getBaseUri() . URLUtil::encodePath($parentUri);
+            $html .= '<a href="' . $fullPath . '" class="btn">⇤ Go to parent</a>';
+        } else {
+            $html .= '<span class="btn disabled">⇤ Go to parent</span>';
+        }
+
+        $html .= ' <a href="?sabreAction=plugins" class="btn"><span class="oi" data-glyph="puzzle-piece"></span> Plugins</a>';
+
+        $html .= "</nav>";
+
+        return $html;
+
+    }
+
+    /**
+     * Generates the page footer.
+     *
+     * Returns html.
+     *
+     * @return string
+     */
+    function generateFooter() {
+
+        $version = DAV\Version::VERSION;
+        return <<<HTML
+<footer>Generated by SabreDAV $version (c)2007-2015 <a href="http://sabre.io/">http://sabre.io/</a></footer>
+</body>
+</html>
+HTML;
+
+    }
+
+    /**
+     * This method is used to generate the 'actions panel' output for
+     * collections.
+     *
+     * This specifically generates the interfaces for creating new files, and
+     * creating new directories.
+     *
+     * @param DAV\INode $node
+     * @param mixed $output
+     * @return void
+     */
+    function htmlActionsPanel(DAV\INode $node, &$output) {
+
+        if (!$node instanceof DAV\ICollection)
+            return;
+
+        // We also know fairly certain that if an object is a non-extended
+        // SimpleCollection, we won't need to show the panel either.
+        if (get_class($node) === 'Sabre\\DAV\\SimpleCollection')
+            return;
+
+        ob_start();
+        echo '<form method="post" action="">
+        <h3>Create new folder</h3>
+        <input type="hidden" name="sabreAction" value="mkcol" />
+        <label>Name:</label> <input type="text" name="name" /><br />
+        <input type="submit" value="create" />
+        </form>
+        <form method="post" action="" enctype="multipart/form-data">
+        <h3>Upload file</h3>
+        <input type="hidden" name="sabreAction" value="put" />
+        <label>Name (optional):</label> <input type="text" name="name" /><br />
+        <label>File:</label> <input type="file" name="file" /><br />
+        <input type="submit" value="upload" />
+        </form>
+        ';
+
+        $output .= ob_get_clean();
+
+    }
+
+    /**
+     * This method takes a path/name of an asset and turns it into url
+     * suiteable for http access.
+     *
+     * @param string $assetName
+     * @return string
+     */
+    protected function getAssetUrl($assetName) {
+
+        return $this->server->getBaseUri() . '?sabreAction=asset&assetName=' . urlencode($assetName);
+
+    }
+
+    /**
+     * This method returns a local pathname to an asset.
+     *
+     * @param string $assetName
+     * @return string
+     * @throws DAV\Exception\NotFound
+     */
+    protected function getLocalAssetPath($assetName) {
+
+        $assetDir = __DIR__ . '/assets/';
+        $path = $assetDir . $assetName;
+
+        // Making sure people aren't trying to escape from the base path.
+        $path = str_replace('\\', '/', $path);
+        if (strpos($path, '/../') !== false || strrchr($path, '/') === '/..') {
+            throw new DAV\Exception\NotFound('Path does not exist, or escaping from the base path was detected');
+        }
+        if (strpos(realpath($path), realpath($assetDir)) === 0 && file_exists($path)) {
+            return $path;
+        }
+        throw new DAV\Exception\NotFound('Path does not exist, or escaping from the base path was detected');
+    }
+
+    /**
+     * This method reads an asset from disk and generates a full http response.
+     *
+     * @param string $assetName
+     * @return void
+     */
+    protected function serveAsset($assetName) {
+
+        $assetPath = $this->getLocalAssetPath($assetName);
+
+        // Rudimentary mime type detection
+        $mime = 'application/octet-stream';
+        $map = [
+            'ico'  => 'image/vnd.microsoft.icon',
+            'png'  => 'image/png',
+            'css'  => 'text/css',
+        ];
+
+        $ext = substr($assetName, strrpos($assetName, '.') + 1);
+        if (isset($map[$ext])) {
+            $mime = $map[$ext];
+        }
+
+        $this->server->httpResponse->setHeader('Content-Type', $mime);
+        $this->server->httpResponse->setHeader('Content-Length', filesize($assetPath));
+        $this->server->httpResponse->setHeader('Cache-Control', 'public, max-age=1209600');
+        $this->server->httpResponse->setStatus(200);
+        $this->server->httpResponse->setBody(fopen($assetPath, 'r'));
+
+    }
+
+    /**
+     * Sort helper function: compares two directory entries based on type and
+     * display name. Collections sort above other types.
+     *
+     * @param array $a
+     * @param array $b
+     * @return int
+     */
+    protected function compareNodes($a, $b) {
+
+        $typeA = (isset($a['{DAV:}resourcetype']))
+            ? (in_array('{DAV:}collection', $a['{DAV:}resourcetype']->getValue()))
+            : false;
+
+        $typeB = (isset($b['{DAV:}resourcetype']))
+            ? (in_array('{DAV:}collection', $b['{DAV:}resourcetype']->getValue()))
+            : false;
+
+        // If same type, sort alphabetically by filename:
+        if ($typeA === $typeB) {
+            return strnatcasecmp($a['displayPath'], $b['displayPath']);
+        }
+        return (($typeA < $typeB) ? 1 : -1);
+
+    }
+
+    /**
+     * Maps a resource type to a human-readable string and icon.
+     *
+     * @param array $resourceTypes
+     * @param INode $node
+     * @return array
+     */
+    private function mapResourceType(array $resourceTypes, $node) {
+
+        if (!$resourceTypes) {
+            if ($node instanceof DAV\IFile) {
+                return [
+                    'string' => 'File',
+                    'icon'   => 'file',
+                ];
+            } else {
+                return [
+                    'string' => 'Unknown',
+                    'icon'   => 'cog',
+                ];
+            }
+        }
+
+        $types = [
+            '{http://calendarserver.org/ns/}calendar-proxy-write' => [
+                'string' => 'Proxy-Write',
+                'icon'   => 'people',
+            ],
+            '{http://calendarserver.org/ns/}calendar-proxy-read' => [
+                'string' => 'Proxy-Read',
+                'icon'   => 'people',
+            ],
+            '{urn:ietf:params:xml:ns:caldav}schedule-outbox' => [
+                'string' => 'Outbox',
+                'icon'   => 'inbox',
+            ],
+            '{urn:ietf:params:xml:ns:caldav}schedule-inbox' => [
+                'string' => 'Inbox',
+                'icon'   => 'inbox',
+            ],
+            '{urn:ietf:params:xml:ns:caldav}calendar' => [
+                'string' => 'Calendar',
+                'icon'   => 'calendar',
+            ],
+            '{http://calendarserver.org/ns/}shared-owner' => [
+                'string' => 'Shared',
+                'icon'   => 'calendar',
+            ],
+            '{http://calendarserver.org/ns/}subscribed' => [
+                'string' => 'Subscription',
+                'icon'   => 'calendar',
+            ],
+            '{urn:ietf:params:xml:ns:carddav}directory' => [
+                'string' => 'Directory',
+                'icon'   => 'globe',
+            ],
+            '{urn:ietf:params:xml:ns:carddav}addressbook' => [
+                'string' => 'Address book',
+                'icon'   => 'book',
+            ],
+            '{DAV:}principal' => [
+                'string' => 'Principal',
+                'icon'   => 'person',
+            ],
+            '{DAV:}collection' => [
+                'string' => 'Collection',
+                'icon'   => 'folder',
+            ],
+        ];
+
+        $info = [
+            'string' => [],
+            'icon'   => 'cog',
+        ];
+        foreach ($resourceTypes as $k => $resourceType) {
+            if (isset($types[$resourceType])) {
+                $info['string'][] = $types[$resourceType]['string'];
+            } else {
+                $info['string'][] = $resourceType;
+            }
+        }
+        foreach ($types as $key => $resourceInfo) {
+            if (in_array($key, $resourceTypes)) {
+                $info['icon'] = $resourceInfo['icon'];
+                break;
+            }
+        }
+        $info['string'] = implode(', ', $info['string']);
+
+        return $info;
+
+    }
+
+    /**
+     * Draws a table row for a property
+     *
+     * @param string $name
+     * @param mixed $value
+     * @return string
+     */
+    private function drawPropertyRow($name, $value) {
+
+        $html = new HtmlOutputHelper(
+            $this->server->getBaseUri(),
+            $this->server->xml->namespaceMap
+        );
+
+        return "<tr><th>" . $html->xmlName($name) . "</th><td>" . $this->drawPropertyValue($html, $value) . "</td></tr>";
+
+    }
+
+    /**
+     * Draws a table row for a property
+     *
+     * @param HtmlOutputHelper $html
+     * @param mixed $value
+     * @return string
+     */
+    private function drawPropertyValue($html, $value) {
+
+        if (is_scalar($value)) {
+            return $html->h($value);
+        } elseif ($value instanceof HtmlOutput) {
+            return $value->toHtml($html);
+        } elseif ($value instanceof \Sabre\Xml\XmlSerializable) {
+
+            // There's no default html output for this property, we're going
+            // to output the actual xml serialization instead.
+            $xml = $this->server->xml->write('{DAV:}root', $value, $this->server->getBaseUri());
+            // removing first and last line, as they contain our root
+            // element.
+            $xml = explode("\n", $xml);
+            $xml = array_slice($xml, 2, -2);
+            return "<pre>" . $html->h(implode("\n", $xml)) . "</pre>";
+
+        } else {
+            return "<em>unknown</em>";
+        }
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins;
+     * using \Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'browser';
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Generates HTML indexes and debug information for your sabre/dav server',
+            'link'        => 'http://sabre.io/dav/browser-plugin/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Browser/PropFindAll.php b/vendor/sabre/dav/lib/DAV/Browser/PropFindAll.php
new file mode 100644
index 000000000..1ac439672
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/PropFindAll.php
@@ -0,0 +1,132 @@
+<?php
+
+namespace Sabre\DAV\Browser;
+
+use Sabre\DAV\PropFind;
+
+/**
+ * This class is used by the browser plugin to trick the system in returning
+ * every defined property.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PropFindAll extends PropFind {
+
+    /**
+     * Creates the PROPFIND object
+     *
+     * @param string $path
+     */
+    function __construct($path) {
+
+        parent::__construct($path, []);
+
+    }
+
+    /**
+     * Handles a specific property.
+     *
+     * This method checks wether the specified property was requested in this
+     * PROPFIND request, and if so, it will call the callback and use the
+     * return value for it's value.
+     *
+     * Example:
+     *
+     * $propFind->handle('{DAV:}displayname', function() {
+     *      return 'hello';
+     * });
+     *
+     * Note that handle will only work the first time. If null is returned, the
+     * value is ignored.
+     *
+     * It's also possible to not pass a callback, but immediately pass a value
+     *
+     * @param string $propertyName
+     * @param mixed $valueOrCallBack
+     * @return void
+     */
+    function handle($propertyName, $valueOrCallBack) {
+
+        if (is_callable($valueOrCallBack)) {
+            $value = $valueOrCallBack();
+        } else {
+            $value = $valueOrCallBack;
+        }
+        if (!is_null($value)) {
+            $this->result[$propertyName] = [200, $value];
+        }
+
+    }
+
+    /**
+     * Sets the value of the property
+     *
+     * If status is not supplied, the status will default to 200 for non-null
+     * properties, and 404 for null properties.
+     *
+     * @param string $propertyName
+     * @param mixed $value
+     * @param int $status
+     * @return void
+     */
+    function set($propertyName, $value, $status = null) {
+
+        if (is_null($status)) {
+            $status = is_null($value) ? 404 : 200;
+        }
+        $this->result[$propertyName] = [$status, $value];
+
+    }
+
+    /**
+     * Returns the current value for a property.
+     *
+     * @param string $propertyName
+     * @return mixed
+     */
+    function get($propertyName) {
+
+        return isset($this->result[$propertyName]) ? $this->result[$propertyName][1] : null;
+
+    }
+
+    /**
+     * Returns the current status code for a property name.
+     *
+     * If the property does not appear in the list of requested properties,
+     * null will be returned.
+     *
+     * @param string $propertyName
+     * @return int|null
+     */
+    function getStatus($propertyName) {
+
+        return isset($this->result[$propertyName]) ? $this->result[$propertyName][0] : 404;
+
+    }
+
+    /**
+     * Returns all propertynames that have a 404 status, and thus don't have a
+     * value yet.
+     *
+     * @return array
+     */
+    function get404Properties() {
+
+        $result = [];
+        foreach ($this->result as $propertyName => $stuff) {
+            if ($stuff[0] === 404) {
+                $result[] = $propertyName;
+            }
+        }
+        // If there's nothing in this list, we're adding one fictional item.
+        if (!$result) {
+            $result[] = '{http://sabredav.org/ns}idk';
+        }
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/ICON-LICENSE b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/ICON-LICENSE
new file mode 100644
index 000000000..2199f4a69
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/ICON-LICENSE
@@ -0,0 +1,21 @@
+The MIT License (MIT)
+
+Copyright (c) 2014 Waybury
+
+Permission is hereby granted, free of charge, to any person obtaining a copy
+of this software and associated documentation files (the "Software"), to deal
+in the Software without restriction, including without limitation the rights
+to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
+copies of the Software, and to permit persons to whom the Software is
+furnished to do so, subject to the following conditions:
+
+The above copyright notice and this permission notice shall be included in
+all copies or substantial portions of the Software.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
+IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
+FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
+AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
+LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
+OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN
+THE SOFTWARE.
\ No newline at end of file
diff --git a/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.css b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.css
new file mode 100644
index 000000000..e74867400
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.css
@@ -0,0 +1,510 @@
+@font-face {
+  font-family: 'Icons';
+  src: url('?sabreAction=asset&assetName=openiconic/open-iconic.eot');
+  src: url('?sabreAction=asset&assetName=openiconic/open-iconic.eot?#iconic-sm') format('embedded-opentype'), url('?sabreAction=asset&assetName=openiconic/open-iconic.woff') format('woff'), url('?sabreAction=asset&assetName=openiconic/open-iconic.ttf') format('truetype'), url('?sabreAction=asset&assetName=openiconic/open-iconic.otf') format('opentype'), url('?sabreAction=asset&assetName=openiconic/open-iconic.svg#iconic-sm') format('svg');
+  font-weight: normal;
+  font-style: normal;
+}
+
+.oi[data-glyph].oi-text-replace {
+  font-size: 0;
+  line-height: 0;
+}
+
+.oi[data-glyph].oi-text-replace:before {
+  width: 1em;
+  text-align: center;
+}
+
+.oi[data-glyph]:before {
+  font-family: 'Icons';
+  display: inline-block;
+  speak: none;
+  line-height: 1;
+  vertical-align: baseline;
+  font-weight: normal;
+  font-style: normal;
+  -webkit-font-smoothing: antialiased;
+  -moz-osx-font-smoothing: grayscale;
+}
+
+.oi[data-glyph]:empty:before {
+  width: 1em;
+  text-align: center;
+  box-sizing: content-box;
+}
+
+.oi[data-glyph].oi-align-left:before {
+  text-align: left;
+}
+
+.oi[data-glyph].oi-align-right:before {
+  text-align: right;
+}
+
+.oi[data-glyph].oi-align-center:before {
+  text-align: center;
+}
+
+.oi[data-glyph].oi-flip-horizontal:before {
+  -webkit-transform: scale(-1, 1);
+  -ms-transform: scale(-1, 1);
+  transform: scale(-1, 1);
+}
+.oi[data-glyph].oi-flip-vertical:before {
+  -webkit-transform: scale(1, -1);
+  -ms-transform: scale(-1, 1);
+  transform: scale(1, -1);
+}
+.oi[data-glyph].oi-flip-horizontal-vertical:before {
+  -webkit-transform: scale(-1, -1);
+  -ms-transform: scale(-1, 1);
+  transform: scale(-1, -1);
+}
+
+
+.oi[data-glyph=account-login]:before { content:'\e000'; }
+
+.oi[data-glyph=account-logout]:before { content:'\e001'; }
+
+.oi[data-glyph=action-redo]:before { content:'\e002'; }
+
+.oi[data-glyph=action-undo]:before { content:'\e003'; }
+
+.oi[data-glyph=align-center]:before { content:'\e004'; }
+
+.oi[data-glyph=align-left]:before { content:'\e005'; }
+
+.oi[data-glyph=align-right]:before { content:'\e006'; }
+
+.oi[data-glyph=aperture]:before { content:'\e007'; }
+
+.oi[data-glyph=arrow-bottom]:before { content:'\e008'; }
+
+.oi[data-glyph=arrow-circle-bottom]:before { content:'\e009'; }
+
+.oi[data-glyph=arrow-circle-left]:before { content:'\e00a'; }
+
+.oi[data-glyph=arrow-circle-right]:before { content:'\e00b'; }
+
+.oi[data-glyph=arrow-circle-top]:before { content:'\e00c'; }
+
+.oi[data-glyph=arrow-left]:before { content:'\e00d'; }
+
+.oi[data-glyph=arrow-right]:before { content:'\e00e'; }
+
+.oi[data-glyph=arrow-thick-bottom]:before { content:'\e00f'; }
+
+.oi[data-glyph=arrow-thick-left]:before { content:'\e010'; }
+
+.oi[data-glyph=arrow-thick-right]:before { content:'\e011'; }
+
+.oi[data-glyph=arrow-thick-top]:before { content:'\e012'; }
+
+.oi[data-glyph=arrow-top]:before { content:'\e013'; }
+
+.oi[data-glyph=audio-spectrum]:before { content:'\e014'; }
+
+.oi[data-glyph=audio]:before { content:'\e015'; }
+
+.oi[data-glyph=badge]:before { content:'\e016'; }
+
+.oi[data-glyph=ban]:before { content:'\e017'; }
+
+.oi[data-glyph=bar-chart]:before { content:'\e018'; }
+
+.oi[data-glyph=basket]:before { content:'\e019'; }
+
+.oi[data-glyph=battery-empty]:before { content:'\e01a'; }
+
+.oi[data-glyph=battery-full]:before { content:'\e01b'; }
+
+.oi[data-glyph=beaker]:before { content:'\e01c'; }
+
+.oi[data-glyph=bell]:before { content:'\e01d'; }
+
+.oi[data-glyph=bluetooth]:before { content:'\e01e'; }
+
+.oi[data-glyph=bold]:before { content:'\e01f'; }
+
+.oi[data-glyph=bolt]:before { content:'\e020'; }
+
+.oi[data-glyph=book]:before { content:'\e021'; }
+
+.oi[data-glyph=bookmark]:before { content:'\e022'; }
+
+.oi[data-glyph=box]:before { content:'\e023'; }
+
+.oi[data-glyph=briefcase]:before { content:'\e024'; }
+
+.oi[data-glyph=british-pound]:before { content:'\e025'; }
+
+.oi[data-glyph=browser]:before { content:'\e026'; }
+
+.oi[data-glyph=brush]:before { content:'\e027'; }
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diff --git a/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.eot b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.eot
new file mode 100644
index 000000000..7ca7c170f
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.eot
diff --git a/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.otf b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.otf
new file mode 100644
index 000000000..d79fb13a1
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.otf
diff --git a/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.svg b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.svg
new file mode 100644
index 000000000..0792c003a
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.svg
@@ -0,0 +1,543 @@
+<?xml version="1.0" standalone="no"?>
+<!DOCTYPE svg PUBLIC "-//W3C//DTD SVG 1.1//EN" "http://www.w3.org/Graphics/SVG/1.1/DTD/svg11.dtd" >
+<!--
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+-->
+<svg xmlns="http://www.w3.org/2000/svg">
+<metadata>
+Created by FontForge 20120731 at Wed Apr 30 22:56:47 2014
+ By P.J. Onori
+Created by P.J. Onori with FontForge 2.0 (http://fontforge.sf.net)
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diff --git a/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.ttf b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.ttf
new file mode 100644
index 000000000..0f94acd1e
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.ttf
diff --git a/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.woff b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.woff
new file mode 100644
index 000000000..793176af4
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/assets/openiconic/open-iconic.woff
diff --git a/vendor/sabre/dav/lib/DAV/Browser/assets/sabredav.css b/vendor/sabre/dav/lib/DAV/Browser/assets/sabredav.css
new file mode 100644
index 000000000..c9ab2c74f
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/assets/sabredav.css
@@ -0,0 +1,228 @@
+/* Start of reset */
+
+* {
+  -webkit-box-sizing: border-box;
+  -moz-box-sizing: border-box;
+  box-sizing: border-box;
+}
+body {
+    margin: 0;
+}
+
+
+/**
+ * Define consistent border, margin, and padding.
+ */
+fieldset {
+  border: 1px solid #c0c0c0;
+  margin: 0 2px;
+  padding: 0.35em 0.625em 0.75em;
+}
+
+table {
+  border-collapse: collapse;
+  border-spacing: 0;
+}
+td,
+th {
+  padding: 0;
+}
+
+/** End of reset */
+
+
+body {
+  font-family: 'Roboto', sans-serif;
+  font-size: 14px;
+  line-height: 22px;
+  font-weight: 300;
+}
+h1 {
+  font-size: 42px;
+  line-height: 44px;
+  padding-bottom: 5px;
+  color: #b10610;
+  margin-top: 10px;
+  margin-bottom: 30px;
+}
+h2 {
+  color: #333333;
+  font-size: 28px;
+  line-height: 44px;
+  font-weight: 300;
+}
+h3 {
+  font-size: 21px;
+  margin-top: 20px;
+  margin-bottom: 10px;
+}
+a {
+  color: #31a1cd;
+}
+h1 a {
+  text-decoration: none;
+}
+h2 a {
+  color: #333333;
+}
+a:visited {
+  color: #6098a2;
+}
+h2 a:visited {
+  color: #333333;
+}
+a:hover {
+  color: #b10610;
+}
+hr {
+  border: none;
+  border-top: 1px dashed #c9ea75;
+  margin-top: 30px;
+  margin-bottom: 30px;
+}
+header {
+  background: #eeeeee;
+}
+header a {
+  font-size: 28px;
+  font-weight: 500;
+  color: #333;
+  text-decoration: none;
+}
+.logo {
+  padding: 5px 10px;
+}
+.logo img {
+  vertical-align: middle;
+  border: 0;
+}
+input, button {
+    font: inherit;
+    color: inherit;
+}
+
+input[type=text] {
+  border: 1px solid #bbbbbb;
+  line-height: 22px;
+  padding: 5px 10px;
+  border-radius: 3px;
+}
+
+nav {
+    padding: 5px;
+}
+
+.btn, button, input[type=submit] {
+  display: inline-block;
+  color: white;
+  background: #4fa3ac;
+  padding: 9px 15px;
+  border-radius: 2px;
+  border: 0;
+  text-decoration: none;
+}
+a.btn:visited {
+    color: white;
+}
+
+.btn.disabled {
+  background: #eeeeee;
+  color: #bbbbbb;
+}
+section {
+  margin: 40px 10px;
+}
+
+section table {
+    height: 40px;
+}
+
+.nodeTable tr {
+    border-bottom: 3px solid white;
+}
+
+.nodeTable td {
+    padding: 10px 10px 10px 10px;
+
+}
+
+.nodeTable a {
+    text-decoration: none;
+}
+
+.nodeTable .nameColumn {
+  font-weight: bold;
+  padding: 10px 20px;
+  background: #ebf5f6;
+  min-width: 200px;
+}
+.nodeTable .oi {
+  color: #b10610;
+}
+
+.propTable tr {
+    height: 40px;
+}
+
+.propTable th {
+  background: #f6f6f6;
+  padding: 0 10px;
+  text-align: left;
+}
+
+.propTable td {
+  padding: 0 10px;
+  background: #eeeeee;
+}
+
+.propTable pre {
+    font-size: 80%;
+    background: #f8f8f8;
+}
+
+.actions {
+  border: 1px dotted #76baa6;
+  padding: 20px;
+  margin-bottom: 20px;
+
+}
+
+.actions h3 {
+  margin-top: 10px;
+  margin-bottom: 30px;
+  padding-bottom: 20px;
+  border-bottom: 1px solid #eeeeee;
+}
+
+.actions label {
+    width: 150px;
+    display: inline-block;
+    line-height: 40px;
+}
+
+.actions input[type=text] {
+    width: 450px;
+}
+
+.actions input[type=submit] {
+    display: inline-block;
+    margin-left: 153px;
+}
+
+footer {
+  padding: 50px 0;
+  font-size: 80%;
+  text-align: center;
+}
+
+ul.tree {
+    list-style: none;
+    margin: 0;
+    padding: 0;
+}
+
+ul.tree ul {
+    list-style: none;
+    padding-left: 10px;
+    border-left: 4px solid #ccc;
+}
diff --git a/vendor/sabre/dav/lib/DAV/Browser/assets/sabredav.png b/vendor/sabre/dav/lib/DAV/Browser/assets/sabredav.png
new file mode 100644
index 000000000..48a97398a
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Browser/assets/sabredav.png
diff --git a/vendor/sabre/dav/lib/DAV/Client.php b/vendor/sabre/dav/lib/DAV/Client.php
new file mode 100644
index 000000000..d46b397b6
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Client.php
@@ -0,0 +1,448 @@
+<?php
+
+namespace Sabre\DAV;
+
+use Sabre\HTTP;
+
+/**
+ * SabreDAV DAV client
+ *
+ * This client wraps around Curl to provide a convenient API to a WebDAV
+ * server.
+ *
+ * NOTE: This class is experimental, it's api will likely change in the future.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Client extends HTTP\Client {
+
+    /**
+     * The xml service.
+     *
+     * Uset this service to configure the property and namespace maps.
+     *
+     * @var mixed
+     */
+    public $xml;
+
+    /**
+     * The elementMap
+     *
+     * This property is linked via reference to $this->xml->elementMap.
+     * It's deprecated as of version 3.0.0, and should no longer be used.
+     *
+     * @deprecated
+     * @var array
+     */
+    public $propertyMap = [];
+
+    /**
+     * Base URI
+     *
+     * This URI will be used to resolve relative urls.
+     *
+     * @var string
+     */
+    protected $baseUri;
+
+    /**
+     * Basic authentication
+     */
+    const AUTH_BASIC = 1;
+
+    /**
+     * Digest authentication
+     */
+    const AUTH_DIGEST = 2;
+
+    /**
+     * NTLM authentication
+     */
+    const AUTH_NTLM = 4;
+
+    /**
+     * Identity encoding, which basically does not nothing.
+     */
+    const ENCODING_IDENTITY = 1;
+
+    /**
+     * Deflate encoding
+     */
+    const ENCODING_DEFLATE = 2;
+
+    /**
+     * Gzip encoding
+     */
+    const ENCODING_GZIP = 4;
+
+    /**
+     * Sends all encoding headers.
+     */
+    const ENCODING_ALL = 7;
+
+    /**
+     * Content-encoding
+     *
+     * @var int
+     */
+    protected $encoding = self::ENCODING_IDENTITY;
+
+    /**
+     * Constructor
+     *
+     * Settings are provided through the 'settings' argument. The following
+     * settings are supported:
+     *
+     *   * baseUri
+     *   * userName (optional)
+     *   * password (optional)
+     *   * proxy (optional)
+     *   * authType (optional)
+     *   * encoding (optional)
+     *
+     *  authType must be a bitmap, using self::AUTH_BASIC, self::AUTH_DIGEST
+     *  and self::AUTH_NTLM. If you know which authentication method will be
+     *  used, it's recommended to set it, as it will save a great deal of
+     *  requests to 'discover' this information.
+     *
+     *  Encoding is a bitmap with one of the ENCODING constants.
+     *
+     * @param array $settings
+     */
+    function __construct(array $settings) {
+
+        if (!isset($settings['baseUri'])) {
+            throw new \InvalidArgumentException('A baseUri must be provided');
+        }
+
+        parent::__construct();
+
+        $this->baseUri = $settings['baseUri'];
+
+        if (isset($settings['proxy'])) {
+            $this->addCurlSetting(CURLOPT_PROXY, $settings['proxy']);
+        }
+
+        if (isset($settings['userName'])) {
+            $userName = $settings['userName'];
+            $password = isset($settings['password']) ? $settings['password'] : '';
+
+            if (isset($settings['authType'])) {
+                $curlType = 0;
+                if ($settings['authType'] & self::AUTH_BASIC) {
+                    $curlType |= CURLAUTH_BASIC;
+                }
+                if ($settings['authType'] & self::AUTH_DIGEST) {
+                    $curlType |= CURLAUTH_DIGEST;
+                }
+                if ($settings['authType'] & self::AUTH_NTLM) {
+                    $curlType |= CURLAUTH_NTLM;
+                }
+            } else {
+                $curlType = CURLAUTH_BASIC | CURLAUTH_DIGEST;
+            }
+
+            $this->addCurlSetting(CURLOPT_HTTPAUTH, $curlType);
+            $this->addCurlSetting(CURLOPT_USERPWD, $userName . ':' . $password);
+
+        }
+
+        if (isset($settings['encoding'])) {
+            $encoding = $settings['encoding'];
+
+            $encodings = [];
+            if ($encoding & self::ENCODING_IDENTITY) {
+                $encodings[] = 'identity';
+            }
+            if ($encoding & self::ENCODING_DEFLATE) {
+                $encodings[] = 'deflate';
+            }
+            if ($encoding & self::ENCODING_GZIP) {
+                $encodings[] = 'gzip';
+            }
+            $this->addCurlSetting(CURLOPT_ENCODING, implode(',', $encodings));
+        }
+
+        $this->addCurlSetting(CURLOPT_USERAGENT, 'sabre-dav/' . Version::VERSION . ' (http://sabre.io/)');
+
+        $this->xml = new Xml\Service();
+        // BC
+        $this->propertyMap = & $this->xml->elementMap;
+
+    }
+
+    /**
+     * Does a PROPFIND request
+     *
+     * The list of requested properties must be specified as an array, in clark
+     * notation.
+     *
+     * The returned array will contain a list of filenames as keys, and
+     * properties as values.
+     *
+     * The properties array will contain the list of properties. Only properties
+     * that are actually returned from the server (without error) will be
+     * returned, anything else is discarded.
+     *
+     * Depth should be either 0 or 1. A depth of 1 will cause a request to be
+     * made to the server to also return all child resources.
+     *
+     * @param string $url
+     * @param array $properties
+     * @param int $depth
+     * @return array
+     */
+    function propFind($url, array $properties, $depth = 0) {
+
+        $dom = new \DOMDocument('1.0', 'UTF-8');
+        $dom->formatOutput = true;
+        $root = $dom->createElementNS('DAV:', 'd:propfind');
+        $prop = $dom->createElement('d:prop');
+
+        foreach ($properties as $property) {
+
+            list(
+                $namespace,
+                $elementName
+            ) = \Sabre\Xml\Service::parseClarkNotation($property);
+
+            if ($namespace === 'DAV:') {
+                $element = $dom->createElement('d:' . $elementName);
+            } else {
+                $element = $dom->createElementNS($namespace, 'x:' . $elementName);
+            }
+
+            $prop->appendChild($element);
+        }
+
+        $dom->appendChild($root)->appendChild($prop);
+        $body = $dom->saveXML();
+
+        $url = $this->getAbsoluteUrl($url);
+
+        $request = new HTTP\Request('PROPFIND', $url, [
+            'Depth'        => $depth,
+            'Content-Type' => 'application/xml'
+        ], $body);
+
+        $response = $this->send($request);
+
+        if ((int)$response->getStatus() >= 400) {
+            throw new \Sabre\HTTP\ClientHttpException($response);
+        }
+
+        $result = $this->parseMultiStatus($response->getBodyAsString());
+
+        // If depth was 0, we only return the top item
+        if ($depth === 0) {
+            reset($result);
+            $result = current($result);
+            return isset($result[200]) ? $result[200] : [];
+        }
+
+        $newResult = [];
+        foreach ($result as $href => $statusList) {
+
+            $newResult[$href] = isset($statusList[200]) ? $statusList[200] : [];
+
+        }
+
+        return $newResult;
+
+    }
+
+    /**
+     * Updates a list of properties on the server
+     *
+     * The list of properties must have clark-notation properties for the keys,
+     * and the actual (string) value for the value. If the value is null, an
+     * attempt is made to delete the property.
+     *
+     * @param string $url
+     * @param array $properties
+     * @return bool
+     */
+    function propPatch($url, array $properties) {
+
+        $propPatch = new Xml\Request\PropPatch();
+        $propPatch->properties = $properties;
+        $xml = $this->xml->write(
+            '{DAV:}propertyupdate',
+            $propPatch
+        );
+
+        $url = $this->getAbsoluteUrl($url);
+        $request = new HTTP\Request('PROPPATCH', $url, [
+            'Content-Type' => 'application/xml',
+        ], $xml);
+        $response = $this->send($request);
+
+        if ($response->getStatus() >= 400) {
+            throw new \Sabre\HTTP\ClientHttpException($response);
+        }
+
+        if ($response->getStatus() === 207) {
+            // If it's a 207, the request could still have failed, but the
+            // information is hidden in the response body.
+            $result = $this->parseMultiStatus($response->getBodyAsString());
+
+            $errorProperties = [];
+            foreach ($result as $href => $statusList) {
+                foreach ($statusList as $status => $properties) {
+
+                    if ($status >= 400) {
+                        foreach ($properties as $propName => $propValue) {
+                            $errorProperties[] = $propName . ' (' . $status . ')';
+                        }
+                    }
+
+                }
+            }
+            if ($errorProperties) {
+
+                throw new \Sabre\HTTP\ClientException('PROPPATCH failed. The following properties errored: ' . implode(', ', $errorProperties));
+            }
+        }
+        return true;
+
+    }
+
+    /**
+     * Performs an HTTP options request
+     *
+     * This method returns all the features from the 'DAV:' header as an array.
+     * If there was no DAV header, or no contents this method will return an
+     * empty array.
+     *
+     * @return array
+     */
+    function options() {
+
+        $request = new HTTP\Request('OPTIONS', $this->getAbsoluteUrl(''));
+        $response = $this->send($request);
+
+        $dav = $response->getHeader('Dav');
+        if (!$dav) {
+            return [];
+        }
+
+        $features = explode(',', $dav);
+        foreach ($features as &$v) {
+            $v = trim($v);
+        }
+        return $features;
+
+    }
+
+    /**
+     * Performs an actual HTTP request, and returns the result.
+     *
+     * If the specified url is relative, it will be expanded based on the base
+     * url.
+     *
+     * The returned array contains 3 keys:
+     *   * body - the response body
+     *   * httpCode - a HTTP code (200, 404, etc)
+     *   * headers - a list of response http headers. The header names have
+     *     been lowercased.
+     *
+     * For large uploads, it's highly recommended to specify body as a stream
+     * resource. You can easily do this by simply passing the result of
+     * fopen(..., 'r').
+     *
+     * This method will throw an exception if an HTTP error was received. Any
+     * HTTP status code above 399 is considered an error.
+     *
+     * Note that it is no longer recommended to use this method, use the send()
+     * method instead.
+     *
+     * @param string $method
+     * @param string $url
+     * @param string|resource|null $body
+     * @param array $headers
+     * @throws ClientException, in case a curl error occurred.
+     * @return array
+     */
+    function request($method, $url = '', $body = null, array $headers = []) {
+
+        $url = $this->getAbsoluteUrl($url);
+
+        $response = $this->send(new HTTP\Request($method, $url, $headers, $body));
+        return [
+            'body'       => $response->getBodyAsString(),
+            'statusCode' => (int)$response->getStatus(),
+            'headers'    => array_change_key_case($response->getHeaders()),
+        ];
+
+    }
+
+    /**
+     * Returns the full url based on the given url (which may be relative). All
+     * urls are expanded based on the base url as given by the server.
+     *
+     * @param string $url
+     * @return string
+     */
+    function getAbsoluteUrl($url) {
+
+        // If the url starts with http:// or https://, the url is already absolute.
+        if (preg_match('/^http(s?):\/\//', $url)) {
+            return $url;
+        }
+
+        // If the url starts with a slash, we must calculate the url based off
+        // the root of the base url.
+        if (strpos($url, '/') === 0) {
+            $parts = parse_url($this->baseUri);
+            return $parts['scheme'] . '://' . $parts['host'] . (isset($parts['port']) ? ':' . $parts['port'] : '') . $url;
+        }
+
+        // Otherwise...
+        return $this->baseUri . $url;
+
+    }
+
+    /**
+     * Parses a WebDAV multistatus response body
+     *
+     * This method returns an array with the following structure
+     *
+     * [
+     *   'url/to/resource' => [
+     *     '200' => [
+     *        '{DAV:}property1' => 'value1',
+     *        '{DAV:}property2' => 'value2',
+     *     ],
+     *     '404' => [
+     *        '{DAV:}property1' => null,
+     *        '{DAV:}property2' => null,
+     *     ],
+     *   ],
+     *   'url/to/resource2' => [
+     *      .. etc ..
+     *   ]
+     * ]
+     *
+     *
+     * @param string $body xml body
+     * @return array
+     */
+    function parseMultiStatus($body) {
+
+        $multistatus = $this->xml->expect('{DAV:}multistatus', $body);
+
+        $result = [];
+
+        foreach ($multistatus->getResponses() as $response) {
+
+            $result[$response->getHref()] = $response->getResponseProperties();
+
+        }
+
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Collection.php b/vendor/sabre/dav/lib/DAV/Collection.php
index 0090a4d6e..a46bcc342 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Collection.php
+++ b/vendor/sabre/dav/lib/DAV/Collection.php
@@ -8,7 +8,7 @@ namespace Sabre\DAV;
  * This is a helper class, that should aid in getting collections classes setup.
  * Most of its methods are implemented, and throw permission denied exceptions
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -28,11 +28,11 @@ abstract class Collection extends Node implements ICollection {
      * @throws Exception\NotFound
      * @return INode
      */
-    public function getChild($name) {
+    function getChild($name) {
 
-        foreach($this->getChildren() as $child) {
+        foreach ($this->getChildren() as $child) {
 
-            if ($child->getName()==$name) return $child;
+            if ($child->getName() === $name) return $child;
 
         }
         throw new Exception\NotFound('File not found: ' . $name);
@@ -47,14 +47,14 @@ abstract class Collection extends Node implements ICollection {
      * @param string $name
      * @return bool
      */
-    public function childExists($name) {
+    function childExists($name) {
 
         try {
 
             $this->getChild($name);
             return true;
 
-        } catch(Exception\NotFound $e) {
+        } catch (Exception\NotFound $e) {
 
             return false;
 
@@ -86,7 +86,7 @@ abstract class Collection extends Node implements ICollection {
      * @param resource|string $data Initial payload
      * @return null|string
      */
-    public function createFile($name, $data = null) {
+    function createFile($name, $data = null) {
 
         throw new Exception\Forbidden('Permission denied to create file (filename ' . $name . ')');
 
@@ -99,7 +99,7 @@ abstract class Collection extends Node implements ICollection {
      * @throws Exception\Forbidden
      * @return void
      */
-    public function createDirectory($name) {
+    function createDirectory($name) {
 
         throw new Exception\Forbidden('Permission denied to create directory');
 
@@ -107,4 +107,3 @@ abstract class Collection extends Node implements ICollection {
 
 
 }
-
diff --git a/vendor/sabre/dav/lib/DAV/CorePlugin.php b/vendor/sabre/dav/lib/DAV/CorePlugin.php
new file mode 100644
index 000000000..3a70b2a7e
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/CorePlugin.php
@@ -0,0 +1,927 @@
+<?php
+
+namespace Sabre\DAV;
+
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Sabre\Xml\ParseException;
+
+/**
+ * The core plugin provides all the basic features for a WebDAV server.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class CorePlugin extends ServerPlugin {
+
+    /**
+     * Reference to server object.
+     *
+     * @var Server
+     */
+    protected $server;
+
+    /**
+     * Sets up the plugin
+     *
+     * @param Server $server
+     * @return void
+     */
+    function initialize(Server $server) {
+
+        $this->server = $server;
+        $server->on('method:GET',       [$this, 'httpGet']);
+        $server->on('method:OPTIONS',   [$this, 'httpOptions']);
+        $server->on('method:HEAD',      [$this, 'httpHead']);
+        $server->on('method:DELETE',    [$this, 'httpDelete']);
+        $server->on('method:PROPFIND',  [$this, 'httpPropFind']);
+        $server->on('method:PROPPATCH', [$this, 'httpPropPatch']);
+        $server->on('method:PUT',       [$this, 'httpPut']);
+        $server->on('method:MKCOL',     [$this, 'httpMkcol']);
+        $server->on('method:MOVE',      [$this, 'httpMove']);
+        $server->on('method:COPY',      [$this, 'httpCopy']);
+        $server->on('method:REPORT',    [$this, 'httpReport']);
+
+        $server->on('propPatch',        [$this, 'propPatchProtectedPropertyCheck'], 90);
+        $server->on('propPatch',        [$this, 'propPatchNodeUpdate'], 200);
+        $server->on('propFind',         [$this, 'propFind']);
+        $server->on('propFind',         [$this, 'propFindNode'], 120);
+        $server->on('propFind',         [$this, 'propFindLate'], 200);
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'core';
+
+    }
+
+    /**
+     * This is the default implementation for the GET method.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpGet(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+        $node = $this->server->tree->getNodeForPath($path);
+
+        if (!$node instanceof IFile) return;
+
+        $body = $node->get();
+
+        // Converting string into stream, if needed.
+        if (is_string($body)) {
+            $stream = fopen('php://temp', 'r+');
+            fwrite($stream, $body);
+            rewind($stream);
+            $body = $stream;
+        }
+
+        /*
+         * TODO: getetag, getlastmodified, getsize should also be used using
+         * this method
+         */
+        $httpHeaders = $this->server->getHTTPHeaders($path);
+
+        /* ContentType needs to get a default, because many webservers will otherwise
+         * default to text/html, and we don't want this for security reasons.
+         */
+        if (!isset($httpHeaders['Content-Type'])) {
+            $httpHeaders['Content-Type'] = 'application/octet-stream';
+        }
+
+
+        if (isset($httpHeaders['Content-Length'])) {
+
+            $nodeSize = $httpHeaders['Content-Length'];
+
+            // Need to unset Content-Length, because we'll handle that during figuring out the range
+            unset($httpHeaders['Content-Length']);
+
+        } else {
+            $nodeSize = null;
+        }
+
+        $response->addHeaders($httpHeaders);
+
+        $range = $this->server->getHTTPRange();
+        $ifRange = $request->getHeader('If-Range');
+        $ignoreRangeHeader = false;
+
+        // If ifRange is set, and range is specified, we first need to check
+        // the precondition.
+        if ($nodeSize && $range && $ifRange) {
+
+            // if IfRange is parsable as a date we'll treat it as a DateTime
+            // otherwise, we must treat it as an etag.
+            try {
+                $ifRangeDate = new \DateTime($ifRange);
+
+                // It's a date. We must check if the entity is modified since
+                // the specified date.
+                if (!isset($httpHeaders['Last-Modified'])) $ignoreRangeHeader = true;
+                else {
+                    $modified = new \DateTime($httpHeaders['Last-Modified']);
+                    if ($modified > $ifRangeDate) $ignoreRangeHeader = true;
+                }
+
+            } catch (\Exception $e) {
+
+                // It's an entity. We can do a simple comparison.
+                if (!isset($httpHeaders['ETag'])) $ignoreRangeHeader = true;
+                elseif ($httpHeaders['ETag'] !== $ifRange) $ignoreRangeHeader = true;
+            }
+        }
+
+        // We're only going to support HTTP ranges if the backend provided a filesize
+        if (!$ignoreRangeHeader && $nodeSize && $range) {
+
+            // Determining the exact byte offsets
+            if (!is_null($range[0])) {
+
+                $start = $range[0];
+                $end = $range[1] ? $range[1] : $nodeSize - 1;
+                if ($start >= $nodeSize)
+                    throw new Exception\RequestedRangeNotSatisfiable('The start offset (' . $range[0] . ') exceeded the size of the entity (' . $nodeSize . ')');
+
+                if ($end < $start) throw new Exception\RequestedRangeNotSatisfiable('The end offset (' . $range[1] . ') is lower than the start offset (' . $range[0] . ')');
+                if ($end >= $nodeSize) $end = $nodeSize - 1;
+
+            } else {
+
+                $start = $nodeSize - $range[1];
+                $end  = $nodeSize - 1;
+
+                if ($start < 0) $start = 0;
+
+            }
+
+            // Streams may advertise themselves as seekable, but still not
+            // actually allow fseek.  We'll manually go forward in the stream
+            // if fseek failed.
+            if (!stream_get_meta_data($body)['seekable'] || fseek($body, $start, SEEK_SET) === -1) {
+                $consumeBlock = 8192;
+                for ($consumed = 0; $start - $consumed > 0;){
+                    if (feof($body)) throw new Exception\RequestedRangeNotSatisfiable('The start offset (' . $start . ') exceeded the size of the entity (' . $consumed . ')');
+                    $consumed += strlen(fread($body, min($start - $consumed, $consumeBlock)));
+                }
+            }
+
+            $response->setHeader('Content-Length', $end - $start + 1);
+            $response->setHeader('Content-Range', 'bytes ' . $start . '-' . $end . '/' . $nodeSize);
+            $response->setStatus(206);
+            $response->setBody($body);
+
+        } else {
+
+            if ($nodeSize) $response->setHeader('Content-Length', $nodeSize);
+            $response->setStatus(200);
+            $response->setBody($body);
+
+        }
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+    /**
+     * HTTP OPTIONS
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpOptions(RequestInterface $request, ResponseInterface $response) {
+
+        $methods = $this->server->getAllowedMethods($request->getPath());
+
+        $response->setHeader('Allow', strtoupper(implode(', ', $methods)));
+        $features = ['1', '3', 'extended-mkcol'];
+
+        foreach ($this->server->getPlugins() as $plugin) {
+            $features = array_merge($features, $plugin->getFeatures());
+        }
+
+        $response->setHeader('DAV', implode(', ', $features));
+        $response->setHeader('MS-Author-Via', 'DAV');
+        $response->setHeader('Accept-Ranges', 'bytes');
+        $response->setHeader('Content-Length', '0');
+        $response->setStatus(200);
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+    /**
+     * HTTP HEAD
+     *
+     * This method is normally used to take a peak at a url, and only get the
+     * HTTP response headers, without the body. This is used by clients to
+     * determine if a remote file was changed, so they can use a local cached
+     * version, instead of downloading it again
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpHead(RequestInterface $request, ResponseInterface $response) {
+
+        // This is implemented by changing the HEAD request to a GET request,
+        // and dropping the response body.
+        $subRequest = clone $request;
+        $subRequest->setMethod('GET');
+
+        try {
+            $this->server->invokeMethod($subRequest, $response, false);
+            $response->setBody('');
+        } catch (Exception\NotImplemented $e) {
+            // Some clients may do HEAD requests on collections, however, GET
+            // requests and HEAD requests _may_ not be defined on a collection,
+            // which would trigger a 501.
+            // This breaks some clients though, so we're transforming these
+            // 501s into 200s.
+            $response->setStatus(200);
+            $response->setBody('');
+            $response->setHeader('Content-Type', 'text/plain');
+            $response->setHeader('X-Sabre-Real-Status', $e->getHTTPCode());
+        }
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+    /**
+     * HTTP Delete
+     *
+     * The HTTP delete method, deletes a given uri
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function httpDelete(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+
+        if (!$this->server->emit('beforeUnbind', [$path])) return false;
+        $this->server->tree->delete($path);
+        $this->server->emit('afterUnbind', [$path]);
+
+        $response->setStatus(204);
+        $response->setHeader('Content-Length', '0');
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+    /**
+     * WebDAV PROPFIND
+     *
+     * This WebDAV method requests information about an uri resource, or a list of resources
+     * If a client wants to receive the properties for a single resource it will add an HTTP Depth: header with a 0 value
+     * If the value is 1, it means that it also expects a list of sub-resources (e.g.: files in a directory)
+     *
+     * The request body contains an XML data structure that has a list of properties the client understands
+     * The response body is also an xml document, containing information about every uri resource and the requested properties
+     *
+     * It has to return a HTTP 207 Multi-status status code
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function httpPropFind(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+
+        $requestBody = $request->getBodyAsString();
+        if (strlen($requestBody)) {
+            try {
+                $propFindXml = $this->server->xml->expect('{DAV:}propfind', $requestBody);
+            } catch (ParseException $e) {
+                throw new BadRequest($e->getMessage(), null, $e);
+            }
+        } else {
+            $propFindXml = new Xml\Request\PropFind();
+            $propFindXml->allProp = true;
+            $propFindXml->properties = [];
+        }
+
+        $depth = $this->server->getHTTPDepth(1);
+        // The only two options for the depth of a propfind is 0 or 1 - as long as depth infinity is not enabled
+        if (!$this->server->enablePropfindDepthInfinity && $depth != 0) $depth = 1;
+
+        $newProperties = $this->server->getPropertiesForPath($path, $propFindXml->properties, $depth);
+
+        // This is a multi-status response
+        $response->setStatus(207);
+        $response->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $response->setHeader('Vary', 'Brief,Prefer');
+
+        // Normally this header is only needed for OPTIONS responses, however..
+        // iCal seems to also depend on these being set for PROPFIND. Since
+        // this is not harmful, we'll add it.
+        $features = ['1', '3', 'extended-mkcol'];
+        foreach ($this->server->getPlugins() as $plugin) {
+            $features = array_merge($features, $plugin->getFeatures());
+        }
+        $response->setHeader('DAV', implode(', ', $features));
+
+        $prefer = $this->server->getHTTPPrefer();
+        $minimal = $prefer['return'] === 'minimal';
+
+        $data = $this->server->generateMultiStatus($newProperties, $minimal);
+        $response->setBody($data);
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+    /**
+     * WebDAV PROPPATCH
+     *
+     * This method is called to update properties on a Node. The request is an XML body with all the mutations.
+     * In this XML body it is specified which properties should be set/updated and/or deleted
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpPropPatch(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+
+        try {
+            $propPatch = $this->server->xml->expect('{DAV:}propertyupdate', $request->getBody());
+        } catch (ParseException $e) {
+            throw new BadRequest($e->getMessage(), null, $e);
+        }
+        $newProperties = $propPatch->properties;
+
+        $result = $this->server->updateProperties($path, $newProperties);
+
+        $prefer = $this->server->getHTTPPrefer();
+        $response->setHeader('Vary', 'Brief,Prefer');
+
+        if ($prefer['return'] === 'minimal') {
+
+            // If return-minimal is specified, we only have to check if the
+            // request was succesful, and don't need to return the
+            // multi-status.
+            $ok = true;
+            foreach ($result as $prop => $code) {
+                if ((int)$code > 299) {
+                    $ok = false;
+                }
+            }
+
+            if ($ok) {
+
+                $response->setStatus(204);
+                return false;
+
+            }
+
+        }
+
+        $response->setStatus(207);
+        $response->setHeader('Content-Type', 'application/xml; charset=utf-8');
+
+
+        // Reorganizing the result for generateMultiStatus
+        $multiStatus = [];
+        foreach ($result as $propertyName => $code) {
+            if (isset($multiStatus[$code])) {
+                $multiStatus[$code][$propertyName] = null;
+            } else {
+                $multiStatus[$code] = [$propertyName => null];
+            }
+        }
+        $multiStatus['href'] = $path;
+
+        $response->setBody(
+            $this->server->generateMultiStatus([$multiStatus])
+        );
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+    /**
+     * HTTP PUT method
+     *
+     * This HTTP method updates a file, or creates a new one.
+     *
+     * If a new resource was created, a 201 Created status code should be returned. If an existing resource is updated, it's a 204 No Content
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpPut(RequestInterface $request, ResponseInterface $response) {
+
+        $body = $request->getBodyAsStream();
+        $path = $request->getPath();
+
+        // Intercepting Content-Range
+        if ($request->getHeader('Content-Range')) {
+            /*
+               An origin server that allows PUT on a given target resource MUST send
+               a 400 (Bad Request) response to a PUT request that contains a
+               Content-Range header field.
+
+               Reference: http://tools.ietf.org/html/rfc7231#section-4.3.4
+            */
+            throw new Exception\BadRequest('Content-Range on PUT requests are forbidden.');
+        }
+
+        // Intercepting the Finder problem
+        if (($expected = $request->getHeader('X-Expected-Entity-Length')) && $expected > 0) {
+
+            /*
+            Many webservers will not cooperate well with Finder PUT requests,
+            because it uses 'Chunked' transfer encoding for the request body.
+
+            The symptom of this problem is that Finder sends files to the
+            server, but they arrive as 0-length files in PHP.
+
+            If we don't do anything, the user might think they are uploading
+            files successfully, but they end up empty on the server. Instead,
+            we throw back an error if we detect this.
+
+            The reason Finder uses Chunked, is because it thinks the files
+            might change as it's being uploaded, and therefore the
+            Content-Length can vary.
+
+            Instead it sends the X-Expected-Entity-Length header with the size
+            of the file at the very start of the request. If this header is set,
+            but we don't get a request body we will fail the request to
+            protect the end-user.
+            */
+
+            // Only reading first byte
+            $firstByte = fread($body, 1);
+            if (strlen($firstByte) !== 1) {
+                throw new Exception\Forbidden('This server is not compatible with OS/X finder. Consider using a different WebDAV client or webserver.');
+            }
+
+            // The body needs to stay intact, so we copy everything to a
+            // temporary stream.
+
+            $newBody = fopen('php://temp', 'r+');
+            fwrite($newBody, $firstByte);
+            stream_copy_to_stream($body, $newBody);
+            rewind($newBody);
+
+            $body = $newBody;
+
+        }
+
+        if ($this->server->tree->nodeExists($path)) {
+
+            $node = $this->server->tree->getNodeForPath($path);
+
+            // If the node is a collection, we'll deny it
+            if (!($node instanceof IFile)) throw new Exception\Conflict('PUT is not allowed on non-files.');
+
+            if (!$this->server->updateFile($path, $body, $etag)) {
+                return false;
+            }
+
+            $response->setHeader('Content-Length', '0');
+            if ($etag) $response->setHeader('ETag', $etag);
+            $response->setStatus(204);
+
+        } else {
+
+            $etag = null;
+            // If we got here, the resource didn't exist yet.
+            if (!$this->server->createFile($path, $body, $etag)) {
+                // For one reason or another the file was not created.
+                return false;
+            }
+
+            $response->setHeader('Content-Length', '0');
+            if ($etag) $response->setHeader('ETag', $etag);
+            $response->setStatus(201);
+
+        }
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+
+    /**
+     * WebDAV MKCOL
+     *
+     * The MKCOL method is used to create a new collection (directory) on the server
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpMkcol(RequestInterface $request, ResponseInterface $response) {
+
+        $requestBody = $request->getBodyAsString();
+        $path = $request->getPath();
+
+        if ($requestBody) {
+
+            $contentType = $request->getHeader('Content-Type');
+            if (strpos($contentType, 'application/xml') !== 0 && strpos($contentType, 'text/xml') !== 0) {
+
+                // We must throw 415 for unsupported mkcol bodies
+                throw new Exception\UnsupportedMediaType('The request body for the MKCOL request must have an xml Content-Type');
+
+            }
+
+            try {
+                $mkcol = $this->server->xml->expect('{DAV:}mkcol', $requestBody);
+            } catch (\Sabre\Xml\ParseException $e) {
+                throw new Exception\BadRequest($e->getMessage(), null, $e);
+            }
+
+            $properties = $mkcol->getProperties();
+
+            if (!isset($properties['{DAV:}resourcetype']))
+                throw new Exception\BadRequest('The mkcol request must include a {DAV:}resourcetype property');
+
+            $resourceType = $properties['{DAV:}resourcetype']->getValue();
+            unset($properties['{DAV:}resourcetype']);
+
+        } else {
+
+            $properties = [];
+            $resourceType = ['{DAV:}collection'];
+
+        }
+
+        $mkcol = new MkCol($resourceType, $properties);
+
+        $result = $this->server->createCollection($path, $mkcol);
+
+        if (is_array($result)) {
+            $response->setStatus(207);
+            $response->setHeader('Content-Type', 'application/xml; charset=utf-8');
+
+            $response->setBody(
+                $this->server->generateMultiStatus([$result])
+            );
+
+        } else {
+            $response->setHeader('Content-Length', '0');
+            $response->setStatus(201);
+        }
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+    /**
+     * WebDAV HTTP MOVE method
+     *
+     * This method moves one uri to a different uri. A lot of the actual request processing is done in getCopyMoveInfo
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpMove(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+
+        $moveInfo = $this->server->getCopyAndMoveInfo($request);
+
+        if ($moveInfo['destinationExists']) {
+
+            if (!$this->server->emit('beforeUnbind', [$moveInfo['destination']])) return false;
+
+        }
+        if (!$this->server->emit('beforeUnbind', [$path])) return false;
+        if (!$this->server->emit('beforeBind', [$moveInfo['destination']])) return false;
+        if (!$this->server->emit('beforeMove', [$path, $moveInfo['destination']])) return false;
+
+        if ($moveInfo['destinationExists']) {
+
+            $this->server->tree->delete($moveInfo['destination']);
+            $this->server->emit('afterUnbind', [$moveInfo['destination']]);
+
+        }
+
+        $this->server->tree->move($path, $moveInfo['destination']);
+
+        // Its important afterMove is called before afterUnbind, because it
+        // allows systems to transfer data from one path to another.
+        // PropertyStorage uses this. If afterUnbind was first, it would clean
+        // up all the properties before it has a chance.
+        $this->server->emit('afterMove', [$path, $moveInfo['destination']]);
+        $this->server->emit('afterUnbind', [$path]);
+        $this->server->emit('afterBind', [$moveInfo['destination']]);
+
+        // If a resource was overwritten we should send a 204, otherwise a 201
+        $response->setHeader('Content-Length', '0');
+        $response->setStatus($moveInfo['destinationExists'] ? 204 : 201);
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+    /**
+     * WebDAV HTTP COPY method
+     *
+     * This method copies one uri to a different uri, and works much like the MOVE request
+     * A lot of the actual request processing is done in getCopyMoveInfo
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpCopy(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+
+        $copyInfo = $this->server->getCopyAndMoveInfo($request);
+
+        if (!$this->server->emit('beforeBind', [$copyInfo['destination']])) return false;
+        if ($copyInfo['destinationExists']) {
+            if (!$this->server->emit('beforeUnbind', [$copyInfo['destination']])) return false;
+            $this->server->tree->delete($copyInfo['destination']);
+        }
+
+        $this->server->tree->copy($path, $copyInfo['destination']);
+        $this->server->emit('afterBind', [$copyInfo['destination']]);
+
+        // If a resource was overwritten we should send a 204, otherwise a 201
+        $response->setHeader('Content-Length', '0');
+        $response->setStatus($copyInfo['destinationExists'] ? 204 : 201);
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+
+    }
+
+    /**
+     * HTTP REPORT method implementation
+     *
+     * Although the REPORT method is not part of the standard WebDAV spec (it's from rfc3253)
+     * It's used in a lot of extensions, so it made sense to implement it into the core.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpReport(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+
+        $result = $this->server->xml->parse(
+            $request->getBody(),
+            $request->getUrl(),
+            $rootElementName
+        );
+
+        if ($this->server->emit('report', [$rootElementName, $result, $path])) {
+
+            // If emit returned true, it means the report was not supported
+            throw new Exception\ReportNotSupported();
+
+        }
+
+        // Sending back false will interupt the event chain and tell the server
+        // we've handled this method.
+        return false;
+
+    }
+
+    /**
+     * This method is called during property updates.
+     *
+     * Here we check if a user attempted to update a protected property and
+     * ensure that the process fails if this is the case.
+     *
+     * @param string $path
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    function propPatchProtectedPropertyCheck($path, PropPatch $propPatch) {
+
+        // Comparing the mutation list to the list of propetected properties.
+        $mutations = $propPatch->getMutations();
+
+        $protected = array_intersect(
+            $this->server->protectedProperties,
+            array_keys($mutations)
+        );
+
+        if ($protected) {
+            $propPatch->setResultCode($protected, 403);
+        }
+
+    }
+
+    /**
+     * This method is called during property updates.
+     *
+     * Here we check if a node implements IProperties and let the node handle
+     * updating of (some) properties.
+     *
+     * @param string $path
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    function propPatchNodeUpdate($path, PropPatch $propPatch) {
+
+        // This should trigger a 404 if the node doesn't exist.
+        $node = $this->server->tree->getNodeForPath($path);
+
+        if ($node instanceof IProperties) {
+            $node->propPatch($propPatch);
+        }
+
+    }
+
+    /**
+     * This method is called when properties are retrieved.
+     *
+     * Here we add all the default properties.
+     *
+     * @param PropFind $propFind
+     * @param INode $node
+     * @return void
+     */
+    function propFind(PropFind $propFind, INode $node) {
+
+        $propFind->handle('{DAV:}getlastmodified', function() use ($node) {
+            $lm = $node->getLastModified();
+            if ($lm) {
+                return new Xml\Property\GetLastModified($lm);
+            }
+        });
+
+        if ($node instanceof IFile) {
+            $propFind->handle('{DAV:}getcontentlength', [$node, 'getSize']);
+            $propFind->handle('{DAV:}getetag', [$node, 'getETag']);
+            $propFind->handle('{DAV:}getcontenttype', [$node, 'getContentType']);
+        }
+
+        if ($node instanceof IQuota) {
+            $quotaInfo = null;
+            $propFind->handle('{DAV:}quota-used-bytes', function() use (&$quotaInfo, $node) {
+                $quotaInfo = $node->getQuotaInfo();
+                return $quotaInfo[0];
+            });
+            $propFind->handle('{DAV:}quota-available-bytes', function() use (&$quotaInfo, $node) {
+                if (!$quotaInfo) {
+                    $quotaInfo = $node->getQuotaInfo();
+                }
+                return $quotaInfo[1];
+            });
+        }
+
+        $propFind->handle('{DAV:}supported-report-set', function() use ($propFind) {
+            $reports = [];
+            foreach ($this->server->getPlugins() as $plugin) {
+                $reports = array_merge($reports, $plugin->getSupportedReportSet($propFind->getPath()));
+            }
+            return new Xml\Property\SupportedReportSet($reports);
+        });
+        $propFind->handle('{DAV:}resourcetype', function() use ($node) {
+            return new Xml\Property\ResourceType($this->server->getResourceTypeForNode($node));
+        });
+        $propFind->handle('{DAV:}supported-method-set', function() use ($propFind) {
+            return new Xml\Property\SupportedMethodSet(
+                $this->server->getAllowedMethods($propFind->getPath())
+            );
+        });
+
+    }
+
+    /**
+     * Fetches properties for a node.
+     *
+     * This event is called a bit later, so plugins have a chance first to
+     * populate the result.
+     *
+     * @param PropFind $propFind
+     * @param INode $node
+     * @return void
+     */
+    function propFindNode(PropFind $propFind, INode $node) {
+
+        if ($node instanceof IProperties && $propertyNames = $propFind->get404Properties()) {
+
+            $nodeProperties = $node->getProperties($propertyNames);
+            foreach ($propertyNames as $propertyName) {
+                if (array_key_exists($propertyName, $nodeProperties)) {
+                    $propFind->set($propertyName, $nodeProperties[$propertyName], 200);
+                }
+            }
+
+        }
+
+    }
+
+    /**
+     * This method is called when properties are retrieved.
+     *
+     * This specific handler is called very late in the process, because we
+     * want other systems to first have a chance to handle the properties.
+     *
+     * @param PropFind $propFind
+     * @param INode $node
+     * @return void
+     */
+    function propFindLate(PropFind $propFind, INode $node) {
+
+        $propFind->handle('{http://calendarserver.org/ns/}getctag', function() use ($propFind) {
+
+            // If we already have a sync-token from the current propFind
+            // request, we can re-use that.
+            $val = $propFind->get('{http://sabredav.org/ns}sync-token');
+            if ($val) return $val;
+
+            $val = $propFind->get('{DAV:}sync-token');
+            if ($val && is_scalar($val)) {
+                return $val;
+            }
+            if ($val && $val instanceof Xml\Property\Href) {
+                return substr($val->getHref(), strlen(Sync\Plugin::SYNCTOKEN_PREFIX));
+            }
+
+            // If we got here, the earlier two properties may simply not have
+            // been part of the earlier request. We're going to fetch them.
+            $result = $this->server->getProperties($propFind->getPath(), [
+                '{http://sabredav.org/ns}sync-token',
+                '{DAV:}sync-token',
+            ]);
+
+            if (isset($result['{http://sabredav.org/ns}sync-token'])) {
+                return $result['{http://sabredav.org/ns}sync-token'];
+            }
+            if (isset($result['{DAV:}sync-token'])) {
+                $val = $result['{DAV:}sync-token'];
+                if (is_scalar($val)) {
+                    return $val;
+                } elseif ($val instanceof Xml\Property\Href) {
+                    return substr($val->getHref(), strlen(Sync\Plugin::SYNCTOKEN_PREFIX));
+                }
+            }
+
+        });
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'The Core plugin provides a lot of the basic functionality required by WebDAV, such as a default implementation for all HTTP and WebDAV methods.',
+            'link'        => null,
+        ];
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception.php b/vendor/sabre/dav/lib/DAV/Exception.php
index 22a319e9f..14f5bab2a 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception.php
+++ b/vendor/sabre/dav/lib/DAV/Exception.php
@@ -1,15 +1,5 @@
 <?php
 
-/**
- * SabreDAV base exception
- *
- * This is SabreDAV's base exception file, use this to implement your own exception.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-
 namespace Sabre\DAV;
 
 /**
@@ -20,6 +10,10 @@ namespace Sabre\DAV;
  *
  * This class also allows you to generate custom xml data for your exceptions. This will be displayed
  * in the 'error' element in the failing response.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
  */
 class Exception extends \Exception {
 
@@ -28,7 +22,7 @@ class Exception extends \Exception {
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 500;
 
@@ -41,7 +35,7 @@ class Exception extends \Exception {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(Server $server,\DOMElement $errorNode) {
+    function serialize(Server $server, \DOMElement $errorNode) {
 
 
     }
@@ -54,11 +48,10 @@ class Exception extends \Exception {
      * @param Server $server
      * @return array
      */
-    public function getHTTPHeaders(Server $server) {
+    function getHTTPHeaders(Server $server) {
 
-        return array();
+        return [];
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/BadRequest.php b/vendor/sabre/dav/lib/DAV/Exception/BadRequest.php
index d59727e3a..c21f493da 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/BadRequest.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/BadRequest.php
@@ -2,24 +2,26 @@
 
 namespace Sabre\DAV\Exception;
 
+use Sabre\DAV;
+
 /**
  * BadRequest
  *
  * The BadRequest is thrown when the user submitted an invalid HTTP request
  * BadRequest
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class BadRequest extends \Sabre\DAV\Exception {
+class BadRequest extends DAV\Exception {
 
     /**
      * Returns the HTTP statuscode for this exception
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 400;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/Conflict.php b/vendor/sabre/dav/lib/DAV/Exception/Conflict.php
index cbb8fcf1a..4190e6082 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/Conflict.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/Conflict.php
@@ -2,24 +2,26 @@
 
 namespace Sabre\DAV\Exception;
 
+use Sabre\DAV;
+
 /**
  * Conflict
  *
  * A 409 Conflict is thrown when a user tried to make a directory over an existing
  * file or in a parent directory that doesn't exist.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Conflict extends \Sabre\DAV\Exception {
+class Conflict extends DAV\Exception {
 
     /**
      * Returns the HTTP statuscode for this exception
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 409;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/ConflictingLock.php b/vendor/sabre/dav/lib/DAV/Exception/ConflictingLock.php
index 715870f46..b2d2746c5 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/ConflictingLock.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/ConflictingLock.php
@@ -10,7 +10,7 @@ use Sabre\DAV;
  * Similar to  the Locked exception, this exception thrown when a LOCK request
  * was made, on a resource which was already locked
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -23,13 +23,12 @@ class ConflictingLock extends Locked {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server, \DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
         if ($this->lock) {
-            $error = $errorNode->ownerDocument->createElementNS('DAV:','d:no-conflicting-lock');
+            $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:no-conflicting-lock');
             $errorNode->appendChild($error);
-            if (!is_object($this->lock)) var_dump($this->lock);
-            $error->appendChild($errorNode->ownerDocument->createElementNS('DAV:','d:href',$this->lock->uri));
+            $error->appendChild($errorNode->ownerDocument->createElementNS('DAV:', 'd:href', $this->lock->uri));
         }
 
     }
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/Forbidden.php b/vendor/sabre/dav/lib/DAV/Exception/Forbidden.php
index 2dc620612..77df7ca9e 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/Forbidden.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/Forbidden.php
@@ -2,23 +2,25 @@
 
 namespace Sabre\DAV\Exception;
 
+use Sabre\DAV;
+
 /**
  * Forbidden
  *
  * This exception is thrown whenever a user tries to do an operation he's not allowed to
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Forbidden extends \Sabre\DAV\Exception {
+class Forbidden extends DAV\Exception {
 
     /**
      * Returns the HTTP statuscode for this exception
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 403;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/InsufficientStorage.php b/vendor/sabre/dav/lib/DAV/Exception/InsufficientStorage.php
index f7e382c5a..96e1acc50 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/InsufficientStorage.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/InsufficientStorage.php
@@ -2,23 +2,25 @@
 
 namespace Sabre\DAV\Exception;
 
+use Sabre\DAV;
+
 /**
  * InsufficientStorage
  *
  * This Exception can be thrown, when for example a harddisk is full or a quota is exceeded
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class InsufficientStorage extends \Sabre\DAV\Exception {
+class InsufficientStorage extends DAV\Exception {
 
     /**
      * Returns the HTTP statuscode for this exception
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 507;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/InvalidResourceType.php b/vendor/sabre/dav/lib/DAV/Exception/InvalidResourceType.php
index 847ed4786..505fe5c10 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/InvalidResourceType.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/InvalidResourceType.php
@@ -10,7 +10,7 @@ namespace Sabre\DAV\Exception;
  *
  * See RFC5689 section 3.3
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -23,9 +23,9 @@ class InvalidResourceType extends Forbidden {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(\Sabre\DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(\Sabre\DAV\Server $server, \DOMElement $errorNode) {
 
-        $error = $errorNode->ownerDocument->createElementNS('DAV:','d:valid-resourcetype');
+        $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:valid-resourcetype');
         $errorNode->appendChild($error);
 
     }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/InvalidSyncToken.php b/vendor/sabre/dav/lib/DAV/Exception/InvalidSyncToken.php
new file mode 100644
index 000000000..51a253b29
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Exception/InvalidSyncToken.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Sabre\DAV\Exception;
+
+use Sabre\DAV;
+
+/**
+ * InvalidSyncToken
+ *
+ * This exception is emited for the {DAV:}valid-sync-token pre-condition, as
+ * defined in rfc6578, section 3.2.
+ *
+ * http://tools.ietf.org/html/rfc6578#section-3.2
+ *
+ * This is emitted in cases where the the sync-token, supplied by a client is
+ * either completely unknown, or has expired.
+ *
+ * @author Evert Pot (http://evertpot.com/)
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class InvalidSyncToken extends Forbidden {
+
+    /**
+     * This method allows the exception to include additional information into the WebDAV error response
+     *
+     * @param DAV\Server $server
+     * @param \DOMElement $errorNode
+     * @return void
+     */
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
+
+        $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:valid-sync-token');
+        $errorNode->appendChild($error);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/LengthRequired.php b/vendor/sabre/dav/lib/DAV/Exception/LengthRequired.php
index 9487686dc..989718558 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/LengthRequired.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/LengthRequired.php
@@ -10,7 +10,7 @@ use Sabre\DAV;
  * This exception is thrown when a request was made that required a
  * Content-Length header, but did not contain one.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -21,7 +21,7 @@ class LengthRequired extends DAV\Exception {
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 411;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/LockTokenMatchesRequestUri.php b/vendor/sabre/dav/lib/DAV/Exception/LockTokenMatchesRequestUri.php
index 37fc7f8dc..5f8c31868 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/LockTokenMatchesRequestUri.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/LockTokenMatchesRequestUri.php
@@ -9,7 +9,7 @@ use Sabre\DAV;
  *
  * This exception is thrown by UNLOCK if a supplied lock-token is invalid
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -18,7 +18,7 @@ class LockTokenMatchesRequestUri extends Conflict {
     /**
      * Creates the exception
      */
-    public function __construct() {
+    function __construct() {
 
         $this->message = 'The locktoken supplied does not match any locks on this entity';
 
@@ -31,9 +31,9 @@ class LockTokenMatchesRequestUri extends Conflict {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
-        $error = $errorNode->ownerDocument->createElementNS('DAV:','d:lock-token-matches-request-uri');
+        $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:lock-token-matches-request-uri');
         $errorNode->appendChild($error);
 
     }
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/Locked.php b/vendor/sabre/dav/lib/DAV/Exception/Locked.php
index 2bee1b02f..8176db46e 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/Locked.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/Locked.php
@@ -9,7 +9,7 @@ use Sabre\DAV;
  *
  * The 423 is thrown when a client tried to access a resource that was locked, without supplying a valid lock token
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -30,7 +30,7 @@ class Locked extends DAV\Exception {
      *
      * @param DAV\Locks\LockInfo $lock
      */
-    public function __construct(DAV\Locks\LockInfo $lock = null) {
+    function __construct(DAV\Locks\LockInfo $lock = null) {
 
         $this->lock = $lock;
 
@@ -41,7 +41,7 @@ class Locked extends DAV\Exception {
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 423;
 
@@ -54,13 +54,13 @@ class Locked extends DAV\Exception {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
         if ($this->lock) {
-            $error = $errorNode->ownerDocument->createElementNS('DAV:','d:lock-token-submitted');
+            $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:lock-token-submitted');
             $errorNode->appendChild($error);
 
-            $href = $errorNode->ownerDocument->createElementNS('DAV:','d:href');
+            $href = $errorNode->ownerDocument->createElementNS('DAV:', 'd:href');
             $href->appendChild($errorNode->ownerDocument->createTextNode($this->lock->uri));
             $error->appendChild(
                 $href
@@ -70,4 +70,3 @@ class Locked extends DAV\Exception {
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/MethodNotAllowed.php b/vendor/sabre/dav/lib/DAV/Exception/MethodNotAllowed.php
index 05970cfa8..30c1c2553 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/MethodNotAllowed.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/MethodNotAllowed.php
@@ -2,23 +2,25 @@
 
 namespace Sabre\DAV\Exception;
 
+use Sabre\DAV;
+
 /**
  * MethodNotAllowed
  *
  * The 405 is thrown when a client tried to create a directory on an already existing directory
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class MethodNotAllowed extends \Sabre\DAV\Exception {
+class MethodNotAllowed extends DAV\Exception {
 
     /**
      * Returns the HTTP statuscode for this exception
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 405;
 
@@ -32,13 +34,13 @@ class MethodNotAllowed extends \Sabre\DAV\Exception {
      * @param \Sabre\DAV\Server $server
      * @return array
      */
-    public function getHTTPHeaders(\Sabre\DAV\Server $server) {
+    function getHTTPHeaders(\Sabre\DAV\Server $server) {
 
         $methods = $server->getAllowedMethods($server->getRequestUri());
 
-        return array(
-            'Allow' => strtoupper(implode(', ',$methods)),
-        );
+        return [
+            'Allow' => strtoupper(implode(', ', $methods)),
+        ];
 
     }
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/NotAuthenticated.php b/vendor/sabre/dav/lib/DAV/Exception/NotAuthenticated.php
index c082d489b..e69a60c75 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/NotAuthenticated.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/NotAuthenticated.php
@@ -10,7 +10,7 @@ use Sabre\DAV;
  * This exception is thrown when the client did not provide valid
  * authentication credentials.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -21,7 +21,7 @@ class NotAuthenticated extends DAV\Exception {
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 401;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/NotFound.php b/vendor/sabre/dav/lib/DAV/Exception/NotFound.php
index 83e699cb2..b0397446d 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/NotFound.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/NotFound.php
@@ -2,27 +2,28 @@
 
 namespace Sabre\DAV\Exception;
 
+use Sabre\DAV;
+
 /**
  * NotFound
  *
  * This Exception is thrown when a Node couldn't be found. It returns HTTP error code 404
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class NotFound extends \Sabre\DAV\Exception {
+class NotFound extends DAV\Exception {
 
     /**
      * Returns the HTTP statuscode for this exception
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 404;
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/NotImplemented.php b/vendor/sabre/dav/lib/DAV/Exception/NotImplemented.php
index 5f031cb7f..68f309222 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/NotImplemented.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/NotImplemented.php
@@ -2,23 +2,25 @@
 
 namespace Sabre\DAV\Exception;
 
+use Sabre\DAV;
+
 /**
  * NotImplemented
  *
  * This exception is thrown when the client tried to call an unsupported HTTP method or other feature
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class NotImplemented extends \Sabre\DAV\Exception {
+class NotImplemented extends DAV\Exception {
 
     /**
      * Returns the HTTP statuscode for this exception
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 501;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/PaymentRequired.php b/vendor/sabre/dav/lib/DAV/Exception/PaymentRequired.php
index 3c256a064..43e17344a 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/PaymentRequired.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/PaymentRequired.php
@@ -10,7 +10,7 @@ use Sabre\DAV;
  * The PaymentRequired exception may be thrown in a case where a user must pay
  * to access a certain resource or operation.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -21,7 +21,7 @@ class PaymentRequired extends DAV\Exception {
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 402;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/PreconditionFailed.php b/vendor/sabre/dav/lib/DAV/Exception/PreconditionFailed.php
index deb8a5bea..550360e5a 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/PreconditionFailed.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/PreconditionFailed.php
@@ -11,7 +11,7 @@ use Sabre\DAV;
  * like for example an If, If-None-Match or If-Match header, which caused the HTTP
  * request to not execute (the condition of the header failed)
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -33,7 +33,7 @@ class PreconditionFailed extends DAV\Exception {
      * @param string $message
      * @param string $header
      */
-    public function __construct($message, $header=null) {
+    function __construct($message, $header = null) {
 
         parent::__construct($message);
         $this->header = $header;
@@ -45,7 +45,7 @@ class PreconditionFailed extends DAV\Exception {
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 412;
 
@@ -58,7 +58,7 @@ class PreconditionFailed extends DAV\Exception {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
         if ($this->header) {
             $prop = $errorNode->ownerDocument->createElement('s:header');
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/ReportNotSupported.php b/vendor/sabre/dav/lib/DAV/Exception/ReportNotSupported.php
index 8e32096e0..a83695627 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/ReportNotSupported.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/ReportNotSupported.php
@@ -9,11 +9,11 @@ use Sabre\DAV;
  *
  * This exception is thrown when the client requested an unknown report through the REPORT method
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ReportNotSupported extends Forbidden {
+class ReportNotSupported extends UnsupportedMediaType {
 
     /**
      * This method allows the exception to include additional information into the WebDAV error response
@@ -22,9 +22,9 @@ class ReportNotSupported extends Forbidden {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
-        $error = $errorNode->ownerDocument->createElementNS('DAV:','d:supported-report');
+        $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:supported-report');
         $errorNode->appendChild($error);
 
     }
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/RequestedRangeNotSatisfiable.php b/vendor/sabre/dav/lib/DAV/Exception/RequestedRangeNotSatisfiable.php
index 25002be6a..c8ccfc062 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/RequestedRangeNotSatisfiable.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/RequestedRangeNotSatisfiable.php
@@ -10,7 +10,7 @@ use Sabre\DAV;
  * This exception is normally thrown when the user
  * request a range that is out of the entity bounds.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -21,11 +21,10 @@ class RequestedRangeNotSatisfiable extends DAV\Exception {
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 416;
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/ServiceUnavailable.php b/vendor/sabre/dav/lib/DAV/Exception/ServiceUnavailable.php
index 59e433954..31df606e2 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/ServiceUnavailable.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/ServiceUnavailable.php
@@ -11,20 +11,20 @@ use Sabre\DAV;
  * is currently not available (e.g. down for maintenance).
  *
  * @author Thomas Müller <thomas.mueller@tmit.eu>
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 class ServiceUnavailable extends DAV\Exception {
 
-	/**
-	 * Returns the HTTP statuscode for this exception
-	 *
-	 * @return int
-	 */
-	public function getHTTPCode() {
+    /**
+     * Returns the HTTP statuscode for this exception
+     *
+     * @return int
+     */
+    function getHTTPCode() {
 
-		return 503;
+        return 503;
 
-	}
+    }
 
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/TooManyMatches.php b/vendor/sabre/dav/lib/DAV/Exception/TooManyMatches.php
new file mode 100644
index 000000000..d0f0f84e8
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Exception/TooManyMatches.php
@@ -0,0 +1,38 @@
+<?php
+
+namespace Sabre\DAV\Exception;
+
+use Sabre\DAV;
+
+/**
+ * TooManyMatches
+ *
+ * This exception is emited for the {DAV:}number-of-matches-within-limits
+ * post-condition, as defined in rfc6578, section 3.2.
+ *
+ * http://tools.ietf.org/html/rfc6578#section-3.2
+ *
+ * This is emitted in cases where the response to a {DAV:}sync-collection would
+ * generate more results than the implementation is willing to send back.
+ *
+ * @author Evert Pot (http://evertpot.com/)
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class TooManyMatches extends Forbidden {
+
+    /**
+     * This method allows the exception to include additional information into the WebDAV error response
+     *
+     * @param DAV\Server $server
+     * @param \DOMElement $errorNode
+     * @return void
+     */
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
+
+        $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:number-of-matches-within-limits');
+        $errorNode->appendChild($error);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/UnsupportedMediaType.php b/vendor/sabre/dav/lib/DAV/Exception/UnsupportedMediaType.php
index 46eea60df..f3d92842d 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/UnsupportedMediaType.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/UnsupportedMediaType.php
@@ -2,24 +2,26 @@
 
 namespace Sabre\DAV\Exception;
 
+use Sabre\DAV;
+
 /**
  * UnSupportedMediaType
  *
  * The 415 Unsupported Media Type status code is generally sent back when the client
  * tried to call an HTTP method, with a body the server didn't understand
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class UnsupportedMediaType extends \Sabre\DAV\Exception {
+class UnsupportedMediaType extends DAV\Exception {
 
     /**
      * returns the http statuscode for this exception
      *
      * @return int
      */
-    public function getHTTPCode() {
+    function getHTTPCode() {
 
         return 415;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/FS/Directory.php b/vendor/sabre/dav/lib/DAV/FS/Directory.php
index 6fdd2aecf..963e5554c 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/FS/Directory.php
+++ b/vendor/sabre/dav/lib/DAV/FS/Directory.php
@@ -1,12 +1,13 @@
 <?php
 
 namespace Sabre\DAV\FS;
+
 use Sabre\DAV;
 
 /**
  * Directory class
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -36,10 +37,11 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
      * @param resource|string $data Initial payload
      * @return null|string
      */
-    public function createFile($name, $data = null) {
+    function createFile($name, $data = null) {
 
         $newPath = $this->path . '/' . $name;
-        file_put_contents($newPath,$data);
+        file_put_contents($newPath, $data);
+        clearstatcache(true, $newPath);
 
     }
 
@@ -49,10 +51,11 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
      * @param string $name
      * @return void
      */
-    public function createDirectory($name) {
+    function createDirectory($name) {
 
         $newPath = $this->path . '/' . $name;
         mkdir($newPath);
+        clearstatcache(true, $newPath);
 
     }
 
@@ -66,7 +69,7 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
      * @throws DAV\Exception\NotFound
      * @return DAV\INode
      */
-    public function getChild($name) {
+    function getChild($name) {
 
         $path = $this->path . '/' . $name;
 
@@ -74,7 +77,7 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
 
         if (is_dir($path)) {
 
-            return new Directory($path);
+            return new self($path);
 
         } else {
 
@@ -89,10 +92,19 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
      *
      * @return DAV\INode[]
      */
-    public function getChildren() {
+    function getChildren() {
+
+        $nodes = [];
+        $iterator = new \FilesystemIterator(
+            $this->path,
+            \FilesystemIterator::CURRENT_AS_SELF
+          | \FilesystemIterator::SKIP_DOTS
+        );
+        foreach ($iterator as $entry) {
+
+            $nodes[] = $this->getChild($entry->getFilename());
 
-        $nodes = array();
-        foreach(scandir($this->path) as $node) if($node!='.' && $node!='..') $nodes[] = $this->getChild($node);
+        }
         return $nodes;
 
     }
@@ -103,7 +115,7 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
      * @param string $name
      * @return bool
      */
-    public function childExists($name) {
+    function childExists($name) {
 
         $path = $this->path . '/' . $name;
         return file_exists($path);
@@ -115,9 +127,9 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
      *
      * @return void
      */
-    public function delete() {
+    function delete() {
 
-        foreach($this->getChildren() as $child) $child->delete();
+        foreach ($this->getChildren() as $child) $child->delete();
         rmdir($this->path);
 
     }
@@ -127,14 +139,13 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
      *
      * @return array
      */
-    public function getQuotaInfo() {
+    function getQuotaInfo() {
 
-        return array(
-            disk_total_space($this->path)-disk_free_space($this->path),
+        return [
+            disk_total_space($this->path) - disk_free_space($this->path),
             disk_free_space($this->path)
-            );
+        ];
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/FS/File.php b/vendor/sabre/dav/lib/DAV/FS/File.php
index d10370fae..4fc5af057 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/FS/File.php
+++ b/vendor/sabre/dav/lib/DAV/FS/File.php
@@ -7,7 +7,7 @@ use Sabre\DAV;
 /**
  * File class
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -19,20 +19,21 @@ class File extends Node implements DAV\IFile {
      * @param resource $data
      * @return void
      */
-    public function put($data) {
+    function put($data) {
 
-        file_put_contents($this->path,$data);
+        file_put_contents($this->path, $data);
+        clearstatcache(true, $this->path);
 
     }
 
     /**
      * Returns the data
      *
-     * @return string
+     * @return resource
      */
-    public function get() {
+    function get() {
 
-        return fopen($this->path,'r');
+        return fopen($this->path, 'r');
 
     }
 
@@ -41,7 +42,7 @@ class File extends Node implements DAV\IFile {
      *
      * @return void
      */
-    public function delete() {
+    function delete() {
 
         unlink($this->path);
 
@@ -52,7 +53,7 @@ class File extends Node implements DAV\IFile {
      *
      * @return int
      */
-    public function getSize() {
+    function getSize() {
 
         return filesize($this->path);
 
@@ -68,9 +69,13 @@ class File extends Node implements DAV\IFile {
      *
      * @return mixed
      */
-    public function getETag() {
+    function getETag() {
 
-        return null;
+        return '"' . sha1(
+            fileinode($this->path) .
+            filesize($this->path) .
+            filemtime($this->path)
+        ) . '"';
 
     }
 
@@ -81,11 +86,10 @@ class File extends Node implements DAV\IFile {
      *
      * @return mixed
      */
-    public function getContentType() {
+    function getContentType() {
 
         return null;
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/FS/Node.php b/vendor/sabre/dav/lib/DAV/FS/Node.php
index 605fa3c82..831c11911 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/FS/Node.php
+++ b/vendor/sabre/dav/lib/DAV/FS/Node.php
@@ -3,13 +3,14 @@
 namespace Sabre\DAV\FS;
 
 use Sabre\DAV;
+use Sabre\HTTP\URLUtil;
 
 /**
  * Base node-class
  *
  * The node class implements the method used by both the File and the Directory classes
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -27,7 +28,7 @@ abstract class Node implements DAV\INode {
      *
      * @param string $path
      */
-    public function __construct($path) {
+    function __construct($path) {
 
         $this->path = $path;
 
@@ -40,9 +41,9 @@ abstract class Node implements DAV\INode {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
-        list(, $name)  = DAV\URLUtil::splitPath($this->path);
+        list(, $name)  = URLUtil::splitPath($this->path);
         return $name;
 
     }
@@ -53,30 +54,27 @@ abstract class Node implements DAV\INode {
      * @param string $name The new name
      * @return void
      */
-    public function setName($name) {
+    function setName($name) {
 
-        list($parentPath, ) = DAV\URLUtil::splitPath($this->path);
-        list(, $newName) = DAV\URLUtil::splitPath($name);
+        list($parentPath, ) = URLUtil::splitPath($this->path);
+        list(, $newName) = URLUtil::splitPath($name);
 
         $newPath = $parentPath . '/' . $newName;
-        rename($this->path,$newPath);
+        rename($this->path, $newPath);
 
         $this->path = $newPath;
 
     }
 
-
-
     /**
      * Returns the last modification time, as a unix timestamp
      *
      * @return int
      */
-    public function getLastModified() {
+    function getLastModified() {
 
         return filemtime($this->path);
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/DAV/FSExt/Directory.php b/vendor/sabre/dav/lib/DAV/FSExt/Directory.php
new file mode 100644
index 000000000..648079e26
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/FSExt/Directory.php
@@ -0,0 +1,219 @@
+<?php
+
+namespace Sabre\DAV\FSExt;
+
+use Sabre\DAV;
+use Sabre\DAV\FS\Node;
+
+/**
+ * Directory class
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Directory extends Node implements DAV\ICollection, DAV\IQuota, DAV\IMoveTarget {
+
+    /**
+     * Creates a new file in the directory
+     *
+     * Data will either be supplied as a stream resource, or in certain cases
+     * as a string. Keep in mind that you may have to support either.
+     *
+     * After successful creation of the file, you may choose to return the ETag
+     * of the new file here.
+     *
+     * The returned ETag must be surrounded by double-quotes (The quotes should
+     * be part of the actual string).
+     *
+     * If you cannot accurately determine the ETag, you should not return it.
+     * If you don't store the file exactly as-is (you're transforming it
+     * somehow) you should also not return an ETag.
+     *
+     * This means that if a subsequent GET to this new file does not exactly
+     * return the same contents of what was submitted here, you are strongly
+     * recommended to omit the ETag.
+     *
+     * @param string $name Name of the file
+     * @param resource|string $data Initial payload
+     * @return null|string
+     */
+    function createFile($name, $data = null) {
+
+        // We're not allowing dots
+        if ($name == '.' || $name == '..') throw new DAV\Exception\Forbidden('Permission denied to . and ..');
+        $newPath = $this->path . '/' . $name;
+        file_put_contents($newPath, $data);
+        clearstatcache(true, $newPath);
+
+        return '"' . sha1(
+            fileinode($newPath) .
+            filesize($newPath) .
+            filemtime($newPath)
+        ) . '"';
+
+    }
+
+    /**
+     * Creates a new subdirectory
+     *
+     * @param string $name
+     * @return void
+     */
+    function createDirectory($name) {
+
+        // We're not allowing dots
+        if ($name == '.' || $name == '..') throw new DAV\Exception\Forbidden('Permission denied to . and ..');
+        $newPath = $this->path . '/' . $name;
+        mkdir($newPath);
+        clearstatcache(true, $newPath);
+
+    }
+
+    /**
+     * Returns a specific child node, referenced by its name
+     *
+     * This method must throw Sabre\DAV\Exception\NotFound if the node does not
+     * exist.
+     *
+     * @param string $name
+     * @throws DAV\Exception\NotFound
+     * @return DAV\INode
+     */
+    function getChild($name) {
+
+        $path = $this->path . '/' . $name;
+
+        if (!file_exists($path)) throw new DAV\Exception\NotFound('File could not be located');
+        if ($name == '.' || $name == '..') throw new DAV\Exception\Forbidden('Permission denied to . and ..');
+
+        if (is_dir($path)) {
+
+            return new self($path);
+
+        } else {
+
+            return new File($path);
+
+        }
+
+    }
+
+    /**
+     * Checks if a child exists.
+     *
+     * @param string $name
+     * @return bool
+     */
+    function childExists($name) {
+
+        if ($name == '.' || $name == '..')
+            throw new DAV\Exception\Forbidden('Permission denied to . and ..');
+
+        $path = $this->path . '/' . $name;
+        return file_exists($path);
+
+    }
+
+    /**
+     * Returns an array with all the child nodes
+     *
+     * @return DAV\INode[]
+     */
+    function getChildren() {
+
+        $nodes = [];
+        $iterator = new \FilesystemIterator(
+            $this->path,
+            \FilesystemIterator::CURRENT_AS_SELF
+          | \FilesystemIterator::SKIP_DOTS
+        );
+
+        foreach ($iterator as $entry) {
+
+            $node = $entry->getFilename();
+
+            if ($node === '.sabredav')
+                continue;
+
+            $nodes[] = $this->getChild($node);
+
+        }
+        return $nodes;
+
+    }
+
+    /**
+     * Deletes all files in this directory, and then itself
+     *
+     * @return bool
+     */
+    function delete() {
+
+        // Deleting all children
+        foreach ($this->getChildren() as $child) $child->delete();
+
+        // Removing resource info, if its still around
+        if (file_exists($this->path . '/.sabredav')) unlink($this->path . '/.sabredav');
+
+        // Removing the directory itself
+        rmdir($this->path);
+
+        return true;
+
+    }
+
+    /**
+     * Returns available diskspace information
+     *
+     * @return array
+     */
+    function getQuotaInfo() {
+
+        $total = disk_total_space(realpath($this->path));
+        $free = disk_free_space(realpath($this->path));
+
+        return [
+            $total - $free,
+            $free
+        ];
+    }
+
+    /**
+     * Moves a node into this collection.
+     *
+     * It is up to the implementors to:
+     *   1. Create the new resource.
+     *   2. Remove the old resource.
+     *   3. Transfer any properties or other data.
+     *
+     * Generally you should make very sure that your collection can easily move
+     * the move.
+     *
+     * If you don't, just return false, which will trigger sabre/dav to handle
+     * the move itself. If you return true from this function, the assumption
+     * is that the move was successful.
+     *
+     * @param string $targetName New local file/collection name.
+     * @param string $sourcePath Full path to source node
+     * @param DAV\INode $sourceNode Source node itself
+     * @return bool
+     */
+    function moveInto($targetName, $sourcePath, DAV\INode $sourceNode) {
+
+        // We only support FSExt\Directory or FSExt\File objects, so
+        // anything else we want to quickly reject.
+        if (!$sourceNode instanceof self && !$sourceNode instanceof File) {
+            return false;
+        }
+
+        // PHP allows us to access protected properties from other objects, as
+        // long as they are defined in a class that has a shared inheritence
+        // with the current class.
+        rename($sourceNode->path, $this->path . '/' . $targetName);
+
+        return true;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/FSExt/File.php b/vendor/sabre/dav/lib/DAV/FSExt/File.php
index 6588fad7e..eb5ae19fe 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/FSExt/File.php
+++ b/vendor/sabre/dav/lib/DAV/FSExt/File.php
@@ -1,12 +1,14 @@
 <?php
 
 namespace Sabre\DAV\FSExt;
+
 use Sabre\DAV;
+use Sabre\DAV\FS\Node;
 
 /**
  * File class
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -15,15 +17,16 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
     /**
      * Updates the data
      *
-     * data is a readable stream resource.
+     * Data is a readable stream resource.
      *
      * @param resource|string $data
      * @return string
      */
-    public function put($data) {
+    function put($data) {
 
-        file_put_contents($this->path,$data);
-        return '"' . md5_file($this->path) . '"';
+        file_put_contents($this->path, $data);
+        clearstatcache(true, $this->path);
+        return $this->getETag();
 
     }
 
@@ -42,7 +45,7 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
      * The third argument is the start or end byte.
      *
      * After a successful put operation, you may choose to return an ETag. The
-     * etag must always be surrounded by double-quotes. These quotes must
+     * ETAG must always be surrounded by double-quotes. These quotes must
      * appear in the actual string you're returning.
      *
      * Clients may use the ETag from a PUT request to later on make sure that
@@ -54,15 +57,15 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
      * @param int $offset
      * @return string|null
      */
-    public function patch($data, $rangeType, $offset = null) {
+    function patch($data, $rangeType, $offset = null) {
 
-        switch($rangeType) {
+        switch ($rangeType) {
             case 1 :
                 $f = fopen($this->path, 'a');
                 break;
             case 2 :
                 $f = fopen($this->path, 'c');
-                fseek($f,$offset);
+                fseek($f, $offset);
                 break;
             case 3 :
                 $f = fopen($this->path, 'c');
@@ -72,10 +75,11 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
         if (is_string($data)) {
             fwrite($f, $data);
         } else {
-            stream_copy_to_stream($data,$f);
+            stream_copy_to_stream($data, $f);
         }
         fclose($f);
-        return '"' . md5_file($this->path) . '"';
+        clearstatcache(true, $this->path);
+        return $this->getETag();
 
     }
 
@@ -84,9 +88,9 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
      *
      * @return resource
      */
-    public function get() {
+    function get() {
 
-        return fopen($this->path,'r');
+        return fopen($this->path, 'r');
 
     }
 
@@ -95,10 +99,9 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
      *
      * @return bool
      */
-    public function delete() {
+    function delete() {
 
-        unlink($this->path);
-        return parent::delete();
+        return unlink($this->path);
 
     }
 
@@ -112,9 +115,13 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
      *
      * @return string|null
      */
-    public function getETag() {
+    function getETag() {
 
-        return '"' . md5_file($this->path). '"';
+        return '"' . sha1(
+            fileinode($this->path) .
+            filesize($this->path) .
+            filemtime($this->path)
+        ) . '"';
 
     }
 
@@ -125,7 +132,7 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
      *
      * @return string|null
      */
-    public function getContentType() {
+    function getContentType() {
 
         return null;
 
@@ -136,11 +143,10 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
      *
      * @return int
      */
-    public function getSize() {
+    function getSize() {
 
         return filesize($this->path);
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/File.php b/vendor/sabre/dav/lib/DAV/File.php
index af8ce735f..e0a0391db 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/File.php
+++ b/vendor/sabre/dav/lib/DAV/File.php
@@ -8,7 +8,7 @@ namespace Sabre\DAV;
  * This is a helper class, that should aid in getting file classes setup.
  * Most of its methods are implemented, and throw permission denied exceptions
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -22,7 +22,7 @@ abstract class File extends Node implements IFile {
      * @param resource $data
      * @return void
      */
-    public function put($data) {
+    function put($data) {
 
         throw new Exception\Forbidden('Permission denied to change data');
 
@@ -35,7 +35,7 @@ abstract class File extends Node implements IFile {
      *
      * @return mixed
      */
-    public function get() {
+    function get() {
 
         throw new Exception\Forbidden('Permission denied to read this file');
 
@@ -46,7 +46,7 @@ abstract class File extends Node implements IFile {
      *
      * @return int
      */
-    public function getSize() {
+    function getSize() {
 
         return 0;
 
@@ -62,7 +62,7 @@ abstract class File extends Node implements IFile {
      *
      * @return string|null
      */
-    public function getETag() {
+    function getETag() {
 
         return null;
 
@@ -75,11 +75,10 @@ abstract class File extends Node implements IFile {
      *
      * @return string|null
      */
-    public function getContentType() {
+    function getContentType() {
 
         return null;
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/ICollection.php b/vendor/sabre/dav/lib/DAV/ICollection.php
index c38d5e553..390d9b741 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/ICollection.php
+++ b/vendor/sabre/dav/lib/DAV/ICollection.php
@@ -7,7 +7,7 @@ namespace Sabre\DAV;
  *
  * This interface should be implemented by each class that represents a collection
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -74,4 +74,3 @@ interface ICollection extends INode {
     function childExists($name);
 
 }
-
diff --git a/vendor/sabre/dav/lib/DAV/IExtendedCollection.php b/vendor/sabre/dav/lib/DAV/IExtendedCollection.php
new file mode 100644
index 000000000..c561d7072
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/IExtendedCollection.php
@@ -0,0 +1,43 @@
+<?php
+
+namespace Sabre\DAV;
+
+/**
+ * The IExtendedCollection interface.
+ *
+ * This interface can be used to create special-type of collection-resources
+ * as defined by RFC 5689.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface IExtendedCollection extends ICollection {
+
+    /**
+     * Creates a new collection.
+     *
+     * This method will receive a MkCol object with all the information about
+     * the new collection that's being created.
+     *
+     * The MkCol object contains information about the resourceType of the new
+     * collection. If you don't support the specified resourceType, you should
+     * throw Exception\InvalidResourceType.
+     *
+     * The object also contains a list of WebDAV properties for the new
+     * collection.
+     *
+     * You should call the handle() method on this object to specify exactly
+     * which properties you are storing. This allows the system to figure out
+     * exactly which properties you didn't store, which in turn allows other
+     * plugins (such as the propertystorage plugin) to handle storing the
+     * property for you.
+     *
+     * @param string $name
+     * @param MkCol $mkCol
+     * @throws Exception\InvalidResourceType
+     * @return void
+     */
+    function createExtendedCollection($name, MkCol $mkCol);
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/IFile.php b/vendor/sabre/dav/lib/DAV/IFile.php
index 6245d3fad..e16a3a58a 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/IFile.php
+++ b/vendor/sabre/dav/lib/DAV/IFile.php
@@ -9,14 +9,14 @@ namespace Sabre\DAV;
  * this specific node a PUT or GET method may be performed, to either update,
  * or retrieve the contents of the file.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 interface IFile extends INode {
 
     /**
-     * Updates the data
+     * Replaces the contents of the file.
      *
      * The data argument is a readable stream resource.
      *
@@ -60,9 +60,14 @@ interface IFile extends INode {
      *
      * An ETag is a unique identifier representing the current version of the file. If the file changes, the ETag MUST change.
      *
-     * Return null if the ETag can not effectively be determined
+     * Return null if the ETag can not effectively be determined.
      *
-     * @return void
+     * The ETag must be surrounded by double-quotes, so something like this
+     * would make a valid ETag:
+     *
+     *   return '"someetag"';
+     *
+     * @return string|null
      */
     function getETag();
 
@@ -74,4 +79,3 @@ interface IFile extends INode {
     function getSize();
 
 }
-
diff --git a/vendor/sabre/dav/lib/DAV/IMoveTarget.php b/vendor/sabre/dav/lib/DAV/IMoveTarget.php
new file mode 100644
index 000000000..f0f67bc26
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/IMoveTarget.php
@@ -0,0 +1,44 @@
+<?php
+
+namespace Sabre\DAV;
+
+/**
+ * By implementing this interface, a collection can effectively say "other
+ * nodes may be moved into this collection".
+ *
+ * The benefit of this, is that sabre/dav will by default perform a move, by
+ * tranfersing an entire directory tree, copying every collection, and deleting
+ * every item.
+ *
+ * If a backend supports a better optimized move operation, this can trigger
+ * some huge speed gains.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface IMoveTarget extends ICollection {
+
+    /**
+     * Moves a node into this collection.
+     *
+     * It is up to the implementors to:
+     *   1. Create the new resource.
+     *   2. Remove the old resource.
+     *   3. Transfer any properties or other data.
+     *
+     * Generally you should make very sure that your collection can easily move
+     * the move.
+     *
+     * If you don't, just return false, which will trigger sabre/dav to handle
+     * the move itself. If you return true from this function, the assumption
+     * is that the move was successful.
+     *
+     * @param string $targetName New local file/collection name.
+     * @param string $sourcePath Full path to source node
+     * @param INode $sourceNode Source node itself
+     * @return bool
+     */
+    function moveInto($targetName, $sourcePath, INode $sourceNode);
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/IMultiGet.php b/vendor/sabre/dav/lib/DAV/IMultiGet.php
new file mode 100644
index 000000000..e26b457ef
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/IMultiGet.php
@@ -0,0 +1,36 @@
+<?php
+
+namespace Sabre\DAV;
+
+/**
+ * IMultiGet
+ *
+ * This interface adds a tiny bit of functionality to collections.
+ *
+ * There a certain situations, in particular in relation to WebDAV-Sync, CalDAV
+ * and CardDAV, where information for a list of items will be requested.
+ *
+ * Because the getChild() call is the main abstraction method, this can in
+ * reality result in many database calls, which could potentially be
+ * optimized.
+ *
+ * The MultiGet interface is used by the server in these cases.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface IMultiGet extends ICollection {
+
+    /**
+     * This method receives a list of paths in it's first argument.
+     * It must return an array with Node objects.
+     *
+     * If any children are not found, you do not have to return them.
+     *
+     * @param string[] $paths
+     * @return array
+     */
+    function getMultipleChildren(array $paths);
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/INode.php b/vendor/sabre/dav/lib/DAV/INode.php
index e183c84be..b5e6cb9ef 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/INode.php
+++ b/vendor/sabre/dav/lib/DAV/INode.php
@@ -5,7 +5,7 @@ namespace Sabre\DAV;
 /**
  * The INode interface is the base interface, and the parent class of both ICollection and IFile
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -43,4 +43,3 @@ interface INode {
     function getLastModified();
 
 }
-
diff --git a/vendor/sabre/dav/lib/DAV/IProperties.php b/vendor/sabre/dav/lib/DAV/IProperties.php
new file mode 100644
index 000000000..00969c2c4
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/IProperties.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Sabre\DAV;
+
+/**
+ * IProperties interface
+ *
+ * Implement this interface to support custom WebDAV properties requested and sent from clients.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface IProperties extends INode {
+
+    /**
+     * Updates properties on this node.
+     *
+     * This method received a PropPatch object, which contains all the
+     * information about the update.
+     *
+     * To update specific properties, call the 'handle' method on this object.
+     * Read the PropPatch documentation for more information.
+     *
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    function propPatch(PropPatch $propPatch);
+
+    /**
+     * Returns a list of properties for this nodes.
+     *
+     * The properties list is a list of propertynames the client requested,
+     * encoded in clark-notation {xmlnamespace}tagname
+     *
+     * If the array is empty, it means 'all properties' were requested.
+     *
+     * Note that it's fine to liberally give properties back, instead of
+     * conforming to the list of requested properties.
+     * The Server class will filter out the extra.
+     *
+     * @param array $properties
+     * @return array
+     */
+    function getProperties($properties);
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/IQuota.php b/vendor/sabre/dav/lib/DAV/IQuota.php
index 988df3d06..e16f386b9 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/IQuota.php
+++ b/vendor/sabre/dav/lib/DAV/IQuota.php
@@ -9,7 +9,7 @@ namespace Sabre\DAV;
  * will check for quota information on any given node. If the information is not available it will
  * attempt to fetch the information from the root node.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -24,4 +24,3 @@ interface IQuota extends ICollection {
     function getQuotaInfo();
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/AbstractBackend.php b/vendor/sabre/dav/lib/DAV/Locks/Backend/AbstractBackend.php
index b2c7b983a..044316cdb 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/AbstractBackend.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Backend/AbstractBackend.php
@@ -2,8 +2,6 @@
 
 namespace Sabre\DAV\Locks\Backend;
 
-use Sabre\DAV\Locks;
-
 /**
  * This is an Abstract clas for lock backends.
  *
@@ -11,11 +9,10 @@ use Sabre\DAV\Locks;
  * to ensure that if default code is required in the backend, there will be a
  * non-bc-breaking way to do so.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 abstract class AbstractBackend implements BackendInterface {
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/BackendInterface.php b/vendor/sabre/dav/lib/DAV/Locks/Backend/BackendInterface.php
index bae666b2f..a2d2fe89c 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Backend/BackendInterface.php
@@ -8,7 +8,7 @@ use Sabre\DAV\Locks;
  * If you are defining your own Locks backend, you must implement this
  * interface.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -27,7 +27,7 @@ interface BackendInterface {
      * @param bool $returnChildLocks
      * @return array
      */
-    public function getLocks($uri, $returnChildLocks);
+    function getLocks($uri, $returnChildLocks);
 
     /**
      * Locks a uri
@@ -36,7 +36,7 @@ interface BackendInterface {
      * @param Locks\LockInfo $lockInfo
      * @return bool
      */
-    public function lock($uri,Locks\LockInfo $lockInfo);
+    function lock($uri, Locks\LockInfo $lockInfo);
 
     /**
      * Removes a lock from a uri
@@ -45,7 +45,6 @@ interface BackendInterface {
      * @param Locks\LockInfo $lockInfo
      * @return bool
      */
-    public function unlock($uri,Locks\LockInfo $lockInfo);
+    function unlock($uri, Locks\LockInfo $lockInfo);
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/File.php b/vendor/sabre/dav/lib/DAV/Locks/Backend/File.php
index 9ac7e06b2..849539bee 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/File.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Backend/File.php
@@ -5,14 +5,15 @@ namespace Sabre\DAV\Locks\Backend;
 use Sabre\DAV\Locks\LockInfo;
 
 /**
- * The Lock manager allows you to handle all file-locks centrally.
+ * This Locks backend stores all locking information in a single file.
  *
- * This Lock Manager stores all its data in a single file.
+ * Note that this is not nearly as robust as a database. If you are considering
+ * using this backend, keep in mind that the PDO backend can work with SqLite,
+ * which is designed to be a good file-based database.
  *
- * Note that this is not nearly as robust as a database, you are encouraged
- * to use the PDO backend instead.
+ * It literally solves the problem this class solves as well, but much better.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -30,7 +31,7 @@ class File extends AbstractBackend {
      *
      * @param string $locksFile path to file
      */
-    public function __construct($locksFile) {
+    function __construct($locksFile) {
 
         $this->locksFile = $locksFile;
 
@@ -49,20 +50,20 @@ class File extends AbstractBackend {
      * @param bool $returnChildLocks
      * @return array
      */
-    public function getLocks($uri, $returnChildLocks) {
+    function getLocks($uri, $returnChildLocks) {
 
-        $newLocks = array();
+        $newLocks = [];
 
         $locks = $this->getData();
 
-        foreach($locks as $lock) {
+        foreach ($locks as $lock) {
 
             if ($lock->uri === $uri ||
                 //deep locks on parents
-                ($lock->depth!=0 && strpos($uri, $lock->uri . '/')===0) ||
+                ($lock->depth != 0 && strpos($uri, $lock->uri . '/') === 0) ||
 
                 // locks on children
-                ($returnChildLocks && (strpos($lock->uri, $uri . '/')===0)) ) {
+                ($returnChildLocks && (strpos($lock->uri, $uri . '/') === 0))) {
 
                 $newLocks[] = $lock;
 
@@ -71,7 +72,7 @@ class File extends AbstractBackend {
         }
 
         // Checking if we can remove any of these locks
-        foreach($newLocks as $k=>$lock) {
+        foreach ($newLocks as $k => $lock) {
             if (time() > $lock->timeout + $lock->created) unset($newLocks[$k]);
         }
         return $newLocks;
@@ -85,7 +86,7 @@ class File extends AbstractBackend {
      * @param LockInfo $lockInfo
      * @return bool
      */
-    public function lock($uri, LockInfo $lockInfo) {
+    function lock($uri, LockInfo $lockInfo) {
 
         // We're making the lock timeout 30 minutes
         $lockInfo->timeout = 1800;
@@ -94,7 +95,7 @@ class File extends AbstractBackend {
 
         $locks = $this->getData();
 
-        foreach($locks as $k=>$lock) {
+        foreach ($locks as $k => $lock) {
             if (
                 ($lock->token == $lockInfo->token) ||
                 (time() > $lock->timeout + $lock->created)
@@ -115,10 +116,10 @@ class File extends AbstractBackend {
      * @param LockInfo $lockInfo
      * @return bool
      */
-    public function unlock($uri, LockInfo $lockInfo) {
+    function unlock($uri, LockInfo $lockInfo) {
 
         $locks = $this->getData();
-        foreach($locks as $k=>$lock) {
+        foreach ($locks as $k => $lock) {
 
             if ($lock->token == $lockInfo->token) {
 
@@ -139,21 +140,22 @@ class File extends AbstractBackend {
      */
     protected function getData() {
 
-        if (!file_exists($this->locksFile)) return array();
+        if (!file_exists($this->locksFile)) return [];
 
         // opening up the file, and creating a shared lock
-        $handle = fopen($this->locksFile,'r');
-        flock($handle,LOCK_SH);
+        $handle = fopen($this->locksFile, 'r');
+        flock($handle, LOCK_SH);
 
         // Reading data until the eof
         $data = stream_get_contents($handle);
 
         // We're all good
+        flock($handle, LOCK_UN);
         fclose($handle);
 
         // Unserializing and checking if the resource file contains data for this file
         $data = unserialize($data);
-        if (!$data) return array();
+        if (!$data) return [];
         return $data;
 
     }
@@ -167,17 +169,17 @@ class File extends AbstractBackend {
     protected function putData(array $newData) {
 
         // opening up the file, and creating an exclusive lock
-        $handle = fopen($this->locksFile,'a+');
-        flock($handle,LOCK_EX);
+        $handle = fopen($this->locksFile, 'a+');
+        flock($handle, LOCK_EX);
 
         // We can only truncate and rewind once the lock is acquired.
-        ftruncate($handle,0);
+        ftruncate($handle, 0);
         rewind($handle);
 
-        fwrite($handle,serialize($newData));
+        fwrite($handle, serialize($newData));
+        flock($handle, LOCK_UN);
         fclose($handle);
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/PDO.php b/vendor/sabre/dav/lib/DAV/Locks/Backend/PDO.php
index ebaeef860..a01d9bae4 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/PDO.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Backend/PDO.php
@@ -10,36 +10,34 @@ use Sabre\DAV\Locks\LockInfo;
  * This Lock Manager stores all its data in a database. You must pass a PDO
  * connection object in the constructor.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 class PDO extends AbstractBackend {
 
     /**
-     * The PDO connection object
+     * The PDO tablename this backend uses.
      *
-     * @var pdo
+     * @var string
      */
-    private $pdo;
+    public $tableName = 'locks';
 
     /**
-     * The PDO tablename this backend uses.
+     * The PDO connection object
      *
-     * @var string
+     * @var pdo
      */
-    protected $tableName;
+    protected $pdo;
 
     /**
      * Constructor
      *
      * @param PDO $pdo
-     * @param string $tableName
      */
-    public function __construct(\PDO $pdo, $tableName = 'locks') {
+    function __construct(\PDO $pdo) {
 
         $this->pdo = $pdo;
-        $this->tableName = $tableName;
 
     }
 
@@ -56,46 +54,46 @@ class PDO extends AbstractBackend {
      * @param bool $returnChildLocks
      * @return array
      */
-    public function getLocks($uri, $returnChildLocks) {
+    function getLocks($uri, $returnChildLocks) {
 
         // NOTE: the following 10 lines or so could be easily replaced by
         // pure sql. MySQL's non-standard string concatenation prevents us
         // from doing this though.
-        $query = 'SELECT owner, token, timeout, created, scope, depth, uri FROM '.$this->tableName.' WHERE ((created + timeout) > CAST(? AS UNSIGNED INTEGER)) AND ((uri = ?)';
-        $params = array(time(),$uri);
+        $query = 'SELECT owner, token, timeout, created, scope, depth, uri FROM ' . $this->tableName . ' WHERE (created > (? - timeout)) AND ((uri = ?)';
+        $params = [time(),$uri];
 
         // We need to check locks for every part in the uri.
-        $uriParts = explode('/',$uri);
+        $uriParts = explode('/', $uri);
 
         // We already covered the last part of the uri
         array_pop($uriParts);
 
-        $currentPath='';
+        $currentPath = '';
 
-        foreach($uriParts as $part) {
+        foreach ($uriParts as $part) {
 
-            if ($currentPath) $currentPath.='/';
-            $currentPath.=$part;
+            if ($currentPath) $currentPath .= '/';
+            $currentPath .= $part;
 
-            $query.=' OR (depth!=0 AND uri = ?)';
+            $query .= ' OR (depth!=0 AND uri = ?)';
             $params[] = $currentPath;
 
         }
 
         if ($returnChildLocks) {
 
-            $query.=' OR (uri LIKE ?)';
+            $query .= ' OR (uri LIKE ?)';
             $params[] = $uri . '/%';
 
         }
-        $query.=')';
+        $query .= ')';
 
         $stmt = $this->pdo->prepare($query);
         $stmt->execute($params);
         $result = $stmt->fetchAll();
 
-        $lockList = array();
-        foreach($result as $row) {
+        $lockList = [];
+        foreach ($result as $row) {
 
             $lockInfo = new LockInfo();
             $lockInfo->owner = $row['owner'];
@@ -120,25 +118,41 @@ class PDO extends AbstractBackend {
      * @param LockInfo $lockInfo
      * @return bool
      */
-    public function lock($uri, LockInfo $lockInfo) {
+    function lock($uri, LockInfo $lockInfo) {
 
         // We're making the lock timeout 30 minutes
-        $lockInfo->timeout = 30*60;
+        $lockInfo->timeout = 30 * 60;
         $lockInfo->created = time();
         $lockInfo->uri = $uri;
 
-        $locks = $this->getLocks($uri,false);
+        $locks = $this->getLocks($uri, false);
         $exists = false;
-        foreach($locks as $lock) {
+        foreach ($locks as $lock) {
             if ($lock->token == $lockInfo->token) $exists = true;
         }
 
         if ($exists) {
-            $stmt = $this->pdo->prepare('UPDATE '.$this->tableName.' SET owner = ?, timeout = ?, scope = ?, depth = ?, uri = ?, created = ? WHERE token = ?');
-            $stmt->execute(array($lockInfo->owner,$lockInfo->timeout,$lockInfo->scope,$lockInfo->depth,$uri,$lockInfo->created,$lockInfo->token));
+            $stmt = $this->pdo->prepare('UPDATE ' . $this->tableName . ' SET owner = ?, timeout = ?, scope = ?, depth = ?, uri = ?, created = ? WHERE token = ?');
+            $stmt->execute([
+                $lockInfo->owner,
+                $lockInfo->timeout,
+                $lockInfo->scope,
+                $lockInfo->depth,
+                $uri,
+                $lockInfo->created,
+                $lockInfo->token
+            ]);
         } else {
-            $stmt = $this->pdo->prepare('INSERT INTO '.$this->tableName.' (owner,timeout,scope,depth,uri,created,token) VALUES (?,?,?,?,?,?,?)');
-            $stmt->execute(array($lockInfo->owner,$lockInfo->timeout,$lockInfo->scope,$lockInfo->depth,$uri,$lockInfo->created,$lockInfo->token));
+            $stmt = $this->pdo->prepare('INSERT INTO ' . $this->tableName . ' (owner,timeout,scope,depth,uri,created,token) VALUES (?,?,?,?,?,?,?)');
+            $stmt->execute([
+                $lockInfo->owner,
+                $lockInfo->timeout,
+                $lockInfo->scope,
+                $lockInfo->depth,
+                $uri,
+                $lockInfo->created,
+                $lockInfo->token
+            ]);
         }
 
         return true;
@@ -154,14 +168,13 @@ class PDO extends AbstractBackend {
      * @param LockInfo $lockInfo
      * @return bool
      */
-    public function unlock($uri, LockInfo $lockInfo) {
+    function unlock($uri, LockInfo $lockInfo) {
 
-        $stmt = $this->pdo->prepare('DELETE FROM '.$this->tableName.' WHERE uri = ? AND token = ?');
-        $stmt->execute(array($uri,$lockInfo->token));
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->tableName . ' WHERE uri = ? AND token = ?');
+        $stmt->execute([$uri, $lockInfo->token]);
 
-        return $stmt->rowCount()===1;
+        return $stmt->rowCount() === 1;
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Locks/LockInfo.php b/vendor/sabre/dav/lib/DAV/Locks/LockInfo.php
index 74bdb0f9c..2c8cca0fe 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Locks/LockInfo.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/LockInfo.php
@@ -8,7 +8,7 @@ namespace Sabre\DAV\Locks;
  * An object of the LockInfo class holds all the information relevant to a
  * single lock.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -78,4 +78,3 @@ class LockInfo {
     public $uri;
 
 }
-
diff --git a/vendor/sabre/dav/lib/DAV/Locks/Plugin.php b/vendor/sabre/dav/lib/DAV/Locks/Plugin.php
new file mode 100644
index 000000000..4855b7076
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Locks/Plugin.php
@@ -0,0 +1,589 @@
+<?php
+
+namespace Sabre\DAV\Locks;
+
+use Sabre\DAV;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+
+/**
+ * Locking plugin
+ *
+ * This plugin provides locking support to a WebDAV server.
+ * The easiest way to get started, is by hooking it up as such:
+ *
+ * $lockBackend = new Sabre\DAV\Locks\Backend\File('./mylockdb');
+ * $lockPlugin = new Sabre\DAV\Locks\Plugin($lockBackend);
+ * $server->addPlugin($lockPlugin);
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends DAV\ServerPlugin {
+
+    /**
+     * locksBackend
+     *
+     * @var Backend\Backend\Interface
+     */
+    protected $locksBackend;
+
+    /**
+     * server
+     *
+     * @var Sabre\DAV\Server
+     */
+    protected $server;
+
+    /**
+     * __construct
+     *
+     * @param Backend\BackendInterface $locksBackend
+     */
+    function __construct(Backend\BackendInterface $locksBackend) {
+
+        $this->locksBackend = $locksBackend;
+
+    }
+
+    /**
+     * Initializes the plugin
+     *
+     * This method is automatically called by the Server class after addPlugin.
+     *
+     * @param DAV\Server $server
+     * @return void
+     */
+    function initialize(DAV\Server $server) {
+
+        $this->server = $server;
+
+        $this->server->xml->elementMap['{DAV:}lockinfo'] = 'Sabre\\DAV\\Xml\\Request\\Lock';
+
+        $server->on('method:LOCK',    [$this, 'httpLock']);
+        $server->on('method:UNLOCK',  [$this, 'httpUnlock']);
+        $server->on('validateTokens', [$this, 'validateTokens']);
+        $server->on('propFind',       [$this, 'propFind']);
+        $server->on('afterUnbind',    [$this, 'afterUnbind']);
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'locks';
+
+    }
+
+    /**
+     * This method is called after most properties have been found
+     * it allows us to add in any Lock-related properties
+     *
+     * @param DAV\PropFind $propFind
+     * @param DAV\INode $node
+     * @return void
+     */
+    function propFind(DAV\PropFind $propFind, DAV\INode $node) {
+
+        $propFind->handle('{DAV:}supportedlock', function() {
+            return new DAV\Xml\Property\SupportedLock();
+        });
+        $propFind->handle('{DAV:}lockdiscovery', function() use ($propFind) {
+            return new DAV\Xml\Property\LockDiscovery(
+                $this->getLocks($propFind->getPath())
+            );
+        });
+
+    }
+
+    /**
+     * Use this method to tell the server this plugin defines additional
+     * HTTP methods.
+     *
+     * This method is passed a uri. It should only return HTTP methods that are
+     * available for the specified uri.
+     *
+     * @param string $uri
+     * @return array
+     */
+    function getHTTPMethods($uri) {
+
+        return ['LOCK','UNLOCK'];
+
+    }
+
+    /**
+     * Returns a list of features for the HTTP OPTIONS Dav: header.
+     *
+     * In this case this is only the number 2. The 2 in the Dav: header
+     * indicates the server supports locks.
+     *
+     * @return array
+     */
+    function getFeatures() {
+
+        return [2];
+
+    }
+
+    /**
+     * Returns all lock information on a particular uri
+     *
+     * This function should return an array with Sabre\DAV\Locks\LockInfo objects. If there are no locks on a file, return an empty array.
+     *
+     * Additionally there is also the possibility of locks on parent nodes, so we'll need to traverse every part of the tree
+     * If the $returnChildLocks argument is set to true, we'll also traverse all the children of the object
+     * for any possible locks and return those as well.
+     *
+     * @param string $uri
+     * @param bool $returnChildLocks
+     * @return array
+     */
+    function getLocks($uri, $returnChildLocks = false) {
+
+        return $this->locksBackend->getLocks($uri, $returnChildLocks);
+
+    }
+
+    /**
+     * Locks an uri
+     *
+     * The WebDAV lock request can be operated to either create a new lock on a file, or to refresh an existing lock
+     * If a new lock is created, a full XML body should be supplied, containing information about the lock such as the type
+     * of lock (shared or exclusive) and the owner of the lock
+     *
+     * If a lock is to be refreshed, no body should be supplied and there should be a valid If header containing the lock
+     *
+     * Additionally, a lock can be requested for a non-existent file. In these case we're obligated to create an empty file as per RFC4918:S7.3
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function httpLock(RequestInterface $request, ResponseInterface $response) {
+
+        $uri = $request->getPath();
+
+        $existingLocks = $this->getLocks($uri);
+
+        if ($body = $request->getBodyAsString()) {
+            // This is a new lock request
+
+            $existingLock = null;
+            // Checking if there's already non-shared locks on the uri.
+            foreach ($existingLocks as $existingLock) {
+                if ($existingLock->scope === LockInfo::EXCLUSIVE) {
+                    throw new DAV\Exception\ConflictingLock($existingLock);
+                }
+            }
+
+            $lockInfo = $this->parseLockRequest($body);
+            $lockInfo->depth = $this->server->getHTTPDepth();
+            $lockInfo->uri = $uri;
+            if ($existingLock && $lockInfo->scope != LockInfo::SHARED)
+                throw new DAV\Exception\ConflictingLock($existingLock);
+
+        } else {
+
+            // Gonna check if this was a lock refresh.
+            $existingLocks = $this->getLocks($uri);
+            $conditions = $this->server->getIfConditions($request);
+            $found = null;
+
+            foreach ($existingLocks as $existingLock) {
+                foreach ($conditions as $condition) {
+                    foreach ($condition['tokens'] as $token) {
+                        if ($token['token'] === 'opaquelocktoken:' . $existingLock->token) {
+                            $found = $existingLock;
+                            break 3;
+                        }
+                    }
+                }
+            }
+
+            // If none were found, this request is in error.
+            if (is_null($found)) {
+                if ($existingLocks) {
+                    throw new DAV\Exception\Locked(reset($existingLocks));
+                } else {
+                    throw new DAV\Exception\BadRequest('An xml body is required for lock requests');
+                }
+
+            }
+
+            // This must have been a lock refresh
+            $lockInfo = $found;
+
+            // The resource could have been locked through another uri.
+            if ($uri != $lockInfo->uri) $uri = $lockInfo->uri;
+
+        }
+
+        if ($timeout = $this->getTimeoutHeader()) $lockInfo->timeout = $timeout;
+
+        $newFile = false;
+
+        // If we got this far.. we should go check if this node actually exists. If this is not the case, we need to create it first
+        try {
+            $this->server->tree->getNodeForPath($uri);
+
+            // We need to call the beforeWriteContent event for RFC3744
+            // Edit: looks like this is not used, and causing problems now.
+            //
+            // See Issue 222
+            // $this->server->emit('beforeWriteContent',array($uri));
+
+        } catch (DAV\Exception\NotFound $e) {
+
+            // It didn't, lets create it
+            $this->server->createFile($uri, fopen('php://memory', 'r'));
+            $newFile = true;
+
+        }
+
+        $this->lockNode($uri, $lockInfo);
+
+        $response->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $response->setHeader('Lock-Token', '<opaquelocktoken:' . $lockInfo->token . '>');
+        $response->setStatus($newFile ? 201 : 200);
+        $response->setBody($this->generateLockResponse($lockInfo));
+
+        // Returning false will interupt the event chain and mark this method
+        // as 'handled'.
+        return false;
+
+    }
+
+    /**
+     * Unlocks a uri
+     *
+     * This WebDAV method allows you to remove a lock from a node. The client should provide a valid locktoken through the Lock-token http header
+     * The server should return 204 (No content) on success
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return void
+     */
+    function httpUnlock(RequestInterface $request, ResponseInterface $response) {
+
+        $lockToken = $request->getHeader('Lock-Token');
+
+        // If the locktoken header is not supplied, we need to throw a bad request exception
+        if (!$lockToken) throw new DAV\Exception\BadRequest('No lock token was supplied');
+
+        $path = $request->getPath();
+        $locks = $this->getLocks($path);
+
+        // Windows sometimes forgets to include < and > in the Lock-Token
+        // header
+        if ($lockToken[0] !== '<') $lockToken = '<' . $lockToken . '>';
+
+        foreach ($locks as $lock) {
+
+            if ('<opaquelocktoken:' . $lock->token . '>' == $lockToken) {
+
+                $this->unlockNode($path, $lock);
+                $response->setHeader('Content-Length', '0');
+                $response->setStatus(204);
+
+                // Returning false will break the method chain, and mark the
+                // method as 'handled'.
+                return false;
+
+            }
+
+        }
+
+        // If we got here, it means the locktoken was invalid
+        throw new DAV\Exception\LockTokenMatchesRequestUri();
+
+    }
+
+    /**
+     * This method is called after a node is deleted.
+     *
+     * We use this event to clean up any locks that still exist on the node.
+     *
+     * @param string $path
+     * @return void
+     */
+    function afterUnbind($path) {
+
+        $locks = $this->getLocks($path, $includeChildren = true);
+        foreach ($locks as $lock) {
+            $this->unlockNode($path, $lock);
+        }
+
+    }
+
+    /**
+     * Locks a uri
+     *
+     * All the locking information is supplied in the lockInfo object. The object has a suggested timeout, but this can be safely ignored
+     * It is important that if the existing timeout is ignored, the property is overwritten, as this needs to be sent back to the client
+     *
+     * @param string $uri
+     * @param LockInfo $lockInfo
+     * @return bool
+     */
+    function lockNode($uri, LockInfo $lockInfo) {
+
+        if (!$this->server->emit('beforeLock', [$uri, $lockInfo])) return;
+        return $this->locksBackend->lock($uri, $lockInfo);
+
+    }
+
+    /**
+     * Unlocks a uri
+     *
+     * This method removes a lock from a uri. It is assumed all the supplied information is correct and verified
+     *
+     * @param string $uri
+     * @param LockInfo $lockInfo
+     * @return bool
+     */
+    function unlockNode($uri, LockInfo $lockInfo) {
+
+        if (!$this->server->emit('beforeUnlock', [$uri, $lockInfo])) return;
+        return $this->locksBackend->unlock($uri, $lockInfo);
+
+    }
+
+
+    /**
+     * Returns the contents of the HTTP Timeout header.
+     *
+     * The method formats the header into an integer.
+     *
+     * @return int
+     */
+    function getTimeoutHeader() {
+
+        $header = $this->server->httpRequest->getHeader('Timeout');
+
+        if ($header) {
+
+            if (stripos($header, 'second-') === 0) $header = (int)(substr($header, 7));
+            elseif (stripos($header, 'infinite') === 0) $header = LockInfo::TIMEOUT_INFINITE;
+            else throw new DAV\Exception\BadRequest('Invalid HTTP timeout header');
+
+        } else {
+
+            $header = 0;
+
+        }
+
+        return $header;
+
+    }
+
+    /**
+     * Generates the response for successful LOCK requests
+     *
+     * @param LockInfo $lockInfo
+     * @return string
+     */
+    protected function generateLockResponse(LockInfo $lockInfo) {
+
+        return $this->server->xml->write('{DAV:}prop', [
+            '{DAV:}lockdiscovery' =>
+                new DAV\Xml\Property\LockDiscovery([$lockInfo])
+        ]);
+    }
+
+    /**
+     * The validateTokens event is triggered before every request.
+     *
+     * It's a moment where this plugin can check all the supplied lock tokens
+     * in the If: header, and check if they are valid.
+     *
+     * In addition, it will also ensure that it checks any missing lokens that
+     * must be present in the request, and reject requests without the proper
+     * tokens.
+     *
+     * @param RequestInterface $request
+     * @param mixed $conditions
+     * @return void
+     */
+    function validateTokens(RequestInterface $request, &$conditions) {
+
+        // First we need to gather a list of locks that must be satisfied.
+        $mustLocks = [];
+        $method = $request->getMethod();
+
+        // Methods not in that list are operations that doesn't alter any
+        // resources, and we don't need to check the lock-states for.
+        switch ($method) {
+
+            case 'DELETE' :
+                $mustLocks = array_merge($mustLocks, $this->getLocks(
+                    $request->getPath(),
+                    true
+                ));
+                break;
+            case 'MKCOL' :
+            case 'MKCALENDAR' :
+            case 'PROPPATCH' :
+            case 'PUT' :
+            case 'PATCH' :
+                $mustLocks = array_merge($mustLocks, $this->getLocks(
+                    $request->getPath(),
+                    false
+                ));
+                break;
+            case 'MOVE' :
+                $mustLocks = array_merge($mustLocks, $this->getLocks(
+                    $request->getPath(),
+                    true
+                ));
+                $mustLocks = array_merge($mustLocks, $this->getLocks(
+                    $this->server->calculateUri($request->getHeader('Destination')),
+                    false
+                ));
+                break;
+            case 'COPY' :
+                $mustLocks = array_merge($mustLocks, $this->getLocks(
+                    $this->server->calculateUri($request->getHeader('Destination')),
+                    false
+                ));
+                break;
+            case 'LOCK' :
+                //Temporary measure.. figure out later why this is needed
+                // Here we basically ignore all incoming tokens...
+                foreach ($conditions as $ii => $condition) {
+                    foreach ($condition['tokens'] as $jj => $token) {
+                        $conditions[$ii]['tokens'][$jj]['validToken'] = true;
+                    }
+                }
+                return;
+
+        }
+
+        // It's possible that there's identical locks, because of shared
+        // parents. We're removing the duplicates here.
+        $tmp = [];
+        foreach ($mustLocks as $lock) $tmp[$lock->token] = $lock;
+        $mustLocks = array_values($tmp);
+
+        foreach ($conditions as $kk => $condition) {
+
+            foreach ($condition['tokens'] as $ii => $token) {
+
+                // Lock tokens always start with opaquelocktoken:
+                if (substr($token['token'], 0, 16) !== 'opaquelocktoken:') {
+                    continue;
+                }
+
+                $checkToken = substr($token['token'], 16);
+                // Looping through our list with locks.
+                foreach ($mustLocks as $jj => $mustLock) {
+
+                    if ($mustLock->token == $checkToken) {
+
+                        // We have a match!
+                        // Removing this one from mustlocks
+                        unset($mustLocks[$jj]);
+
+                        // Marking the condition as valid.
+                        $conditions[$kk]['tokens'][$ii]['validToken'] = true;
+
+                        // Advancing to the next token
+                        continue 2;
+
+                    }
+
+                }
+
+                // If we got here, it means that there was a
+                // lock-token, but it was not in 'mustLocks'.
+                //
+                // This is an edge-case, as it could mean that token
+                // was specified with a url that was not 'required' to
+                // check. So we're doing one extra lookup to make sure
+                // we really don't know this token.
+                //
+                // This also gets triggered when the user specified a
+                // lock-token that was expired.
+                $oddLocks = $this->getLocks($condition['uri']);
+                foreach ($oddLocks as $oddLock) {
+
+                    if ($oddLock->token === $checkToken) {
+
+                        // We have a hit!
+                        $conditions[$kk]['tokens'][$ii]['validToken'] = true;
+                        continue 2;
+
+                    }
+                }
+
+                // If we get all the way here, the lock-token was
+                // really unknown.
+
+
+            }
+
+        }
+
+        // If there's any locks left in the 'mustLocks' array, it means that
+        // the resource was locked and we must block it.
+        if ($mustLocks) {
+
+            throw new DAV\Exception\Locked(reset($mustLocks));
+
+        }
+
+    }
+
+    /**
+     * Parses a webdav lock xml body, and returns a new Sabre\DAV\Locks\LockInfo object
+     *
+     * @param string $body
+     * @return LockInfo
+     */
+    protected function parseLockRequest($body) {
+
+        $result = $this->server->xml->expect(
+            '{DAV:}lockinfo',
+            $body
+        );
+
+        $lockInfo = new LockInfo();
+
+        $lockInfo->owner = $result->owner;
+        $lockInfo->token = DAV\UUIDUtil::getUUID();
+        $lockInfo->scope = $result->scope;
+
+        return $lockInfo;
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'The locks plugin turns this server into a class-2 WebDAV server and adds support for LOCK and UNLOCK',
+            'link'        => 'http://sabre.io/dav/locks/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/MkCol.php b/vendor/sabre/dav/lib/DAV/MkCol.php
new file mode 100644
index 000000000..c79055418
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/MkCol.php
@@ -0,0 +1,71 @@
+<?php
+
+namespace Sabre\DAV;
+
+/**
+ * This class represents a MKCOL operation.
+ *
+ * MKCOL creates a new collection. MKCOL comes in two flavours:
+ *
+ * 1. MKCOL with no body, signifies the creation of a simple collection.
+ * 2. MKCOL with a request body. This can create a collection with a specific
+ *    resource type, and a set of properties that should be set on the new
+ *    collection. This can be used to create caldav calendars, carddav address
+ *    books, etc.
+ *
+ * Property updates must always be atomic. This means that a property update
+ * must either completely succeed, or completely fail.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class MkCol extends PropPatch {
+
+    /**
+     * A list of resource-types in clark-notation.
+     *
+     * @var array
+     */
+    protected $resourceType;
+
+    /**
+     * Creates the MKCOL object.
+     *
+     * @param string[] $resourceType List of resourcetype values.
+     * @param array $mutations List of new properties values.
+     */
+    function __construct(array $resourceType, array $mutations) {
+
+        $this->resourceType = $resourceType;
+        parent::__construct($mutations);
+
+    }
+
+    /**
+     * Returns the resourcetype of the new collection.
+     *
+     * @return string[]
+     */
+    function getResourceType() {
+
+        return $this->resourceType;
+
+    }
+
+    /**
+     * Returns true or false if the MKCOL operation has at least the specified
+     * resource type.
+     *
+     * If the resourcetype is specified as an array, all resourcetypes are
+     * checked.
+     *
+     * @param string|string[] $resourceType
+     */
+    function hasResourceType($resourceType) {
+
+        return count(array_diff((array)$resourceType, $this->resourceType)) === 0;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Mount/Plugin.php b/vendor/sabre/dav/lib/DAV/Mount/Plugin.php
index 8376b03b0..8e06acb9f 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Mount/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Mount/Plugin.php
@@ -3,13 +3,15 @@
 namespace Sabre\DAV\Mount;
 
 use Sabre\DAV;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
 
 /**
  * This plugin provides support for RFC4709: Mounting WebDAV servers
  *
  * Simply append ?mount to any collection to generate the davmount response.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -28,10 +30,10 @@ class Plugin extends DAV\ServerPlugin {
      * @param DAV\Server $server
      * @return void
      */
-    public function initialize(DAV\Server $server) {
+    function initialize(DAV\Server $server) {
 
         $this->server = $server;
-        $this->server->subscribeEvent('beforeMethod',array($this,'beforeMethod'), 90);
+        $this->server->on('method:GET', [$this, 'httpGet'], 90);
 
     }
 
@@ -39,21 +41,21 @@ class Plugin extends DAV\ServerPlugin {
      * 'beforeMethod' event handles. This event handles intercepts GET requests ending
      * with ?mount
      *
-     * @param string $method
-     * @param string $uri
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
      * @return bool
      */
-    public function beforeMethod($method, $uri) {
+    function httpGet(RequestInterface $request, ResponseInterface $response) {
 
-        if ($method!='GET') return;
-        if ($this->server->httpRequest->getQueryString()!='mount') return;
+        $queryParams = $request->getQueryParameters();
+        if (!array_key_exists('mount', $queryParams)) return;
 
-        $currentUri = $this->server->httpRequest->getAbsoluteUri();
+        $currentUri = $request->getAbsoluteUrl();
 
         // Stripping off everything after the ?
-        list($currentUri) = explode('?',$currentUri);
+        list($currentUri) = explode('?', $currentUri);
 
-        $this->davMount($currentUri);
+        $this->davMount($response, $currentUri);
 
         // Returning false to break the event chain
         return false;
@@ -63,19 +65,20 @@ class Plugin extends DAV\ServerPlugin {
     /**
      * Generates the davmount response
      *
+     * @param ResponseInterface $response
      * @param string $uri absolute uri
      * @return void
      */
-    public function davMount($uri) {
+    function davMount(ResponseInterface $response, $uri) {
 
-        $this->server->httpResponse->sendStatus(200);
-        $this->server->httpResponse->setHeader('Content-Type','application/davmount+xml');
+        $response->setStatus(200);
+        $response->setHeader('Content-Type', 'application/davmount+xml');
         ob_start();
         echo '<?xml version="1.0"?>', "\n";
         echo "<dm:mount xmlns:dm=\"http://purl.org/NET/webdav/mount\">\n";
         echo "  <dm:url>", htmlspecialchars($uri, ENT_NOQUOTES, 'UTF-8'), "</dm:url>\n";
         echo "</dm:mount>";
-        $this->server->httpResponse->sendBody(ob_get_clean());
+        $response->setBody(ob_get_clean());
 
     }
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Node.php b/vendor/sabre/dav/lib/DAV/Node.php
index 44e47be68..ba270e8f9 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Node.php
+++ b/vendor/sabre/dav/lib/DAV/Node.php
@@ -7,22 +7,22 @@ namespace Sabre\DAV;
  *
  * This is a helper class, that should aid in getting nodes setup.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 abstract class Node implements INode {
 
     /**
-     * Returns the last modification time
+     * Returns the last modification time as a unix timestamp.
      *
-     * In this case, it will simply return the current time
+     * If the information is not available, return null.
      *
      * @return int
      */
-    public function getLastModified() {
+    function getLastModified() {
 
-        return time();
+        return null;
 
     }
 
@@ -32,7 +32,7 @@ abstract class Node implements INode {
      * @throws Sabre\DAV\Exception\Forbidden
      * @return void
      */
-    public function delete() {
+    function delete() {
 
         throw new Exception\Forbidden('Permission denied to delete node');
 
@@ -45,11 +45,10 @@ abstract class Node implements INode {
      * @param string $name The new name
      * @return void
      */
-    public function setName($name) {
+    function setName($name) {
 
         throw new Exception\Forbidden('Permission denied to rename file');
 
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/PartialUpdate/IPatchSupport.php b/vendor/sabre/dav/lib/DAV/PartialUpdate/IPatchSupport.php
index aff1d320f..97d24f9cb 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/PartialUpdate/IPatchSupport.php
+++ b/vendor/sabre/dav/lib/DAV/PartialUpdate/IPatchSupport.php
@@ -9,7 +9,7 @@ use Sabre\DAV;
  * It may be used to update a file chunk, upload big a file into smaller
  * chunks or resume an upload
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Jean-Tiare LE BIGOT (http://www.jtlebi.fr/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -45,4 +45,3 @@ interface IPatchSupport extends DAV\IFile {
     function patch($data, $rangeType, $offset = null);
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/PartialUpdate/Plugin.php b/vendor/sabre/dav/lib/DAV/PartialUpdate/Plugin.php
index 2c402dc8f..24ba970b1 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/PartialUpdate/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/PartialUpdate/Plugin.php
@@ -3,6 +3,8 @@
 namespace Sabre\DAV\PartialUpdate;
 
 use Sabre\DAV;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
 
 /**
  * Partial update plugin (Patch method)
@@ -14,7 +16,7 @@ use Sabre\DAV;
  * $patchPlugin = new \Sabre\DAV\PartialUpdate\Plugin();
  * $server->addPlugin($patchPlugin);
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Jean-Tiare LE BIGOT (http://www.jtlebi.fr/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -39,10 +41,10 @@ class Plugin extends DAV\ServerPlugin {
      * @param DAV\Server $server
      * @return void
      */
-    public function initialize(DAV\Server $server) {
+    function initialize(DAV\Server $server) {
 
         $this->server = $server;
-        $server->subscribeEvent('unknownMethod',array($this,'unknownMethod'));
+        $server->on('method:PATCH', [$this, 'httpPatch']);
 
     }
 
@@ -54,57 +56,37 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    public function getPluginName() {
+    function getPluginName() {
 
         return 'partialupdate';
 
     }
 
     /**
-     * This method is called by the Server if the user used an HTTP method
-     * the server didn't recognize.
-     *
-     * This plugin intercepts the PATCH methods.
-     *
-     * @param string $method
-     * @param string $uri
-     * @return bool|null
-     */
-    public function unknownMethod($method, $uri) {
-
-        switch($method) {
-
-            case 'PATCH':
-                return $this->httpPatch($uri);
-
-        }
-
-    }
-
-    /**
      * Use this method to tell the server this plugin defines additional
      * HTTP methods.
      *
      * This method is passed a uri. It should only return HTTP methods that are
      * available for the specified uri.
      *
-     * We claim to support PATCH method (partial update) if and only if
+     * We claim to support PATCH method (partirl update) if and only if
      *     - the node exist
      *     - the node implements our partial update interface
      *
      * @param string $uri
      * @return array
      */
-    public function getHTTPMethods($uri) {
+    function getHTTPMethods($uri) {
 
         $tree = $this->server->tree;
+
         if ($tree->nodeExists($uri)) {
             $node = $tree->getNodeForPath($uri);
-            if ($node instanceof IFile || $node instanceof IPatchSupport) {
-                return array('PATCH');
+            if ($node instanceof IPatchSupport) {
+                return ['PATCH'];
             }
         }
-        return array();
+        return [];
 
     }
 
@@ -113,9 +95,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    public function getFeatures() {
+    function getFeatures() {
 
-        return array('sabredav-partialupdate');
+        return ['sabredav-partialupdate'];
 
     }
 
@@ -126,25 +108,28 @@ class Plugin extends DAV\ServerPlugin {
      * existing resource. If the resource does not exist yet and the first
      * offset is not 0, the request fails
      *
-     * @param string $uri
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
      * @return void
      */
-    protected function httpPatch($uri) {
+    function httpPatch(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
 
         // Get the node. Will throw a 404 if not found
-        $node = $this->server->tree->getNodeForPath($uri);
-        if (!$node instanceof IFile && !$node instanceof IPatchSupport) {
+        $node = $this->server->tree->getNodeForPath($path);
+        if (!$node instanceof IPatchSupport) {
             throw new DAV\Exception\MethodNotAllowed('The target resource does not support the PATCH method.');
         }
 
-        $range = $this->getHTTPUpdateRange();
+        $range = $this->getHTTPUpdateRange($request);
 
         if (!$range) {
             throw new DAV\Exception\BadRequest('No valid "X-Update-Range" found in the headers');
         }
 
         $contentType = strtolower(
-            $this->server->httpRequest->getHeader('Content-Type')
+            $request->getHeader('Content-Type')
         );
 
         if ($contentType != 'application/x-sabredav-partialupdate') {
@@ -154,7 +139,7 @@ class Plugin extends DAV\ServerPlugin {
         $len = $this->server->httpRequest->getHeader('Content-Length');
         if (!$len) throw new DAV\Exception\LengthRequired('A Content-Length header is required');
 
-        switch($range[0]) {
+        switch ($range[0]) {
             case self::RANGE_START :
                 // Calculate the end-range if it doesn't exist.
                 if (!$range[2]) {
@@ -163,48 +148,33 @@ class Plugin extends DAV\ServerPlugin {
                     if ($range[2] < $range[1]) {
                         throw new DAV\Exception\RequestedRangeNotSatisfiable('The end offset (' . $range[2] . ') is lower than the start offset (' . $range[1] . ')');
                     }
-                    if($range[2] - $range[1] + 1 != $len) {
+                    if ($range[2] - $range[1] + 1 != $len) {
                         throw new DAV\Exception\RequestedRangeNotSatisfiable('Actual data length (' . $len . ') is not consistent with begin (' . $range[1] . ') and end (' . $range[2] . ') offsets');
                     }
                 }
                 break;
         }
-        // Checking If-None-Match and related headers.
-        if (!$this->server->checkPreconditions()) return;
 
-        if (!$this->server->broadcastEvent('beforeWriteContent',array($uri, $node, null)))
+        if (!$this->server->emit('beforeWriteContent', [$path, $node, null]))
             return;
 
         $body = $this->server->httpRequest->getBody();
 
 
-        if ($node instanceof IPatchSupport) {
-            $etag = $node->patch($body, $range[0], isset($range[1])?$range[1]:null);
-        } else {
-            // The old interface
-            switch($range[0]) {
-                case self::RANGE_APPEND :
-                    throw new DAV\Exception\NotImplemented('This node does not support the append syntax. Please upgrade it to IPatchSupport');
-                case self::RANGE_START :
-                    $etag = $node->putRange($body, $range[1]);
-                    break;
-                case self::RANGE_END :
-                    throw new DAV\Exception\NotImplemented('This node does not support the end-range syntax. Please upgrade it to IPatchSupport');
-                    break;
-            }
-        }
+        $etag = $node->patch($body, $range[0], isset($range[1]) ? $range[1] : null);
 
-        $this->server->broadcastEvent('afterWriteContent',array($uri, $node));
+        $this->server->emit('afterWriteContent', [$path, $node]);
 
-        $this->server->httpResponse->setHeader('Content-Length','0');
-        if ($etag) $this->server->httpResponse->setHeader('ETag',$etag);
-        $this->server->httpResponse->sendStatus(204);
+        $response->setHeader('Content-Length', '0');
+        if ($etag) $response->setHeader('ETag', $etag);
+        $response->setStatus(204);
 
+        // Breaks the event chain
         return false;
 
     }
 
-   /**
+    /**
      * Returns the HTTP custom range update header
      *
      * This method returns null if there is no well-formed HTTP range request
@@ -216,30 +186,29 @@ class Plugin extends DAV\ServerPlugin {
      * Examples:
      *
      * null - invalid
-     * array(1) - append
-     * array(2,10,15) - update bytes 10, 11, 12, 13, 14, 15
-     * array(2,10,null) - update bytes 10 until the end of the patch body
-     * array(3,-5) - update from 5 bytes from the end of the file.
+     * [1] - append
+     * [2,10,15] - update bytes 10, 11, 12, 13, 14, 15
+     * [2,10,null] - update bytes 10 until the end of the patch body
+     * [3,-5] - update from 5 bytes from the end of the file.
      *
+     * @param RequestInterface $request
      * @return array|null
      */
-    public function getHTTPUpdateRange() {
+    function getHTTPUpdateRange(RequestInterface $request) {
 
-        $range = $this->server->httpRequest->getHeader('X-Update-Range');
+        $range = $request->getHeader('X-Update-Range');
         if (is_null($range)) return null;
 
         // Matching "Range: bytes=1234-5678: both numbers are optional
 
-        if (!preg_match('/^(append)|(?:bytes=([0-9]+)-([0-9]*))|(?:bytes=(-[0-9]+))$/i',$range,$matches)) return null;
+        if (!preg_match('/^(append)|(?:bytes=([0-9]+)-([0-9]*))|(?:bytes=(-[0-9]+))$/i', $range, $matches)) return null;
 
-        if ($matches[1]==='append') {
-            return array(self::RANGE_APPEND);
-        } elseif (strlen($matches[2])>0) {
-            return array(self::RANGE_START, $matches[2], $matches[3]?:null);
-        } elseif ($matches[4]) {
-            return array(self::RANGE_END, $matches[4]);
+        if ($matches[1] === 'append') {
+            return [self::RANGE_APPEND];
+        } elseif (strlen($matches[2]) > 0) {
+            return [self::RANGE_START, $matches[2], $matches[3] ?: null];
         } else {
-            return null;
+            return [self::RANGE_END, $matches[4]];
         }
 
     }
diff --git a/vendor/sabre/dav/lib/DAV/PropFind.php b/vendor/sabre/dav/lib/DAV/PropFind.php
new file mode 100644
index 000000000..8ae6b6cfd
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/PropFind.php
@@ -0,0 +1,347 @@
+<?php
+
+namespace Sabre\DAV;
+
+/**
+ * This class holds all the information about a PROPFIND request.
+ *
+ * It contains the type of PROPFIND request, which properties were requested
+ * and also the returned items.
+ */
+class PropFind {
+
+    /**
+     * A normal propfind
+     */
+    const NORMAL = 0;
+
+    /**
+     * An allprops request.
+     *
+     * While this was originally intended for instructing the server to really
+     * fetch every property, because it was used so often and it's so heavy
+     * this turned into a small list of default properties after a while.
+     *
+     * So 'all properties' now means a hardcoded list.
+     */
+    const ALLPROPS = 1;
+
+    /**
+     * A propname request. This just returns a list of properties that are
+     * defined on a node, without their values.
+     */
+    const PROPNAME = 2;
+
+    /**
+     * Creates the PROPFIND object
+     *
+     * @param string $path
+     * @param array $properties
+     * @param int $depth
+     * @param int $requestType
+     */
+    function __construct($path, array $properties, $depth = 0, $requestType = self::NORMAL) {
+
+        $this->path = $path;
+        $this->properties = $properties;
+        $this->depth = $depth;
+        $this->requestType = $requestType;
+
+        if ($requestType === self::ALLPROPS) {
+            $this->properties = [
+                '{DAV:}getlastmodified',
+                '{DAV:}getcontentlength',
+                '{DAV:}resourcetype',
+                '{DAV:}quota-used-bytes',
+                '{DAV:}quota-available-bytes',
+                '{DAV:}getetag',
+                '{DAV:}getcontenttype',
+            ];
+        }
+
+        foreach ($this->properties as $propertyName) {
+
+            // Seeding properties with 404's.
+            $this->result[$propertyName] = [404, null];
+
+        }
+        $this->itemsLeft = count($this->result);
+
+    }
+
+    /**
+     * Handles a specific property.
+     *
+     * This method checks wether the specified property was requested in this
+     * PROPFIND request, and if so, it will call the callback and use the
+     * return value for it's value.
+     *
+     * Example:
+     *
+     * $propFind->handle('{DAV:}displayname', function() {
+     *      return 'hello';
+     * });
+     *
+     * Note that handle will only work the first time. If null is returned, the
+     * value is ignored.
+     *
+     * It's also possible to not pass a callback, but immediately pass a value
+     *
+     * @param string $propertyName
+     * @param mixed $valueOrCallBack
+     * @return void
+     */
+    function handle($propertyName, $valueOrCallBack) {
+
+        if ($this->itemsLeft && isset($this->result[$propertyName]) && $this->result[$propertyName][0] === 404) {
+            if (is_callable($valueOrCallBack)) {
+                $value = $valueOrCallBack();
+            } else {
+                $value = $valueOrCallBack;
+            }
+            if (!is_null($value)) {
+                $this->itemsLeft--;
+                $this->result[$propertyName] = [200, $value];
+            }
+        }
+
+    }
+
+    /**
+     * Sets the value of the property
+     *
+     * If status is not supplied, the status will default to 200 for non-null
+     * properties, and 404 for null properties.
+     *
+     * @param string $propertyName
+     * @param mixed $value
+     * @param int $status
+     * @return void
+     */
+    function set($propertyName, $value, $status = null) {
+
+        if (is_null($status)) {
+            $status = is_null($value) ? 404 : 200;
+        }
+        // If this is an ALLPROPS request and the property is
+        // unknown, add it to the result; else ignore it:
+        if (!isset($this->result[$propertyName])) {
+            if ($this->requestType === self::ALLPROPS) {
+                $this->result[$propertyName] = [$status, $value];
+            }
+            return;
+        }
+        if ($status !== 404 && $this->result[$propertyName][0] === 404) {
+            $this->itemsLeft--;
+        } elseif ($status === 404 && $this->result[$propertyName][0] !== 404) {
+            $this->itemsLeft++;
+        }
+        $this->result[$propertyName] = [$status, $value];
+
+    }
+
+    /**
+     * Returns the current value for a property.
+     *
+     * @param string $propertyName
+     * @return mixed
+     */
+    function get($propertyName) {
+
+        return isset($this->result[$propertyName]) ? $this->result[$propertyName][1] : null;
+
+    }
+
+    /**
+     * Returns the current status code for a property name.
+     *
+     * If the property does not appear in the list of requested properties,
+     * null will be returned.
+     *
+     * @param string $propertyName
+     * @return int|null
+     */
+    function getStatus($propertyName) {
+
+        return isset($this->result[$propertyName]) ? $this->result[$propertyName][0] : null;
+
+    }
+
+    /**
+     * Updates the path for this PROPFIND.
+     *
+     * @param string $path
+     * @return void
+     */
+    function setPath($path) {
+
+        $this->path = $path;
+
+    }
+
+    /**
+     * Returns the path this PROPFIND request is for.
+     *
+     * @return string
+     */
+    function getPath() {
+
+        return $this->path;
+
+    }
+
+    /**
+     * Returns the depth of this propfind request.
+     *
+     * @return int
+     */
+    function getDepth() {
+
+        return $this->depth;
+
+    }
+
+    /**
+     * Updates the depth of this propfind request.
+     *
+     * @param int $depth
+     * @return void
+     */
+    function setDepth($depth) {
+
+        $this->depth = $depth;
+
+    }
+
+    /**
+     * Returns all propertynames that have a 404 status, and thus don't have a
+     * value yet.
+     *
+     * @return array
+     */
+    function get404Properties() {
+
+        if ($this->itemsLeft === 0) {
+            return [];
+        }
+        $result = [];
+        foreach ($this->result as $propertyName => $stuff) {
+            if ($stuff[0] === 404) {
+                $result[] = $propertyName;
+            }
+        }
+        return $result;
+
+    }
+
+    /**
+     * Returns the full list of requested properties.
+     *
+     * This returns just their names, not a status or value.
+     *
+     * @return array
+     */
+    function getRequestedProperties() {
+
+        return $this->properties;
+
+    }
+
+    /**
+     * Returns true if this was an '{DAV:}allprops' request.
+     *
+     * @return bool
+     */
+    function isAllProps() {
+
+        return $this->requestType === self::ALLPROPS;
+
+    }
+
+    /**
+     * Returns a result array that's often used in multistatus responses.
+     *
+     * The array uses status codes as keys, and property names and value pairs
+     * as the value of the top array.. such as :
+     *
+     * [
+     *  200 => [ '{DAV:}displayname' => 'foo' ],
+     * ]
+     *
+     * @return array
+     */
+    function getResultForMultiStatus() {
+
+        $r = [
+            200 => [],
+            404 => [],
+        ];
+        foreach ($this->result as $propertyName => $info) {
+            if (!isset($r[$info[0]])) {
+                $r[$info[0]] = [$propertyName => $info[1]];
+            } else {
+                $r[$info[0]][$propertyName] = $info[1];
+            }
+        }
+        // Removing the 404's for multi-status requests.
+        if ($this->requestType === self::ALLPROPS) unset($r[404]);
+        return $r;
+
+    }
+
+    /**
+     * The path that we're fetching properties for.
+     *
+     * @var string
+     */
+    protected $path;
+
+    /**
+     * The Depth of the request.
+     *
+     * 0 means only the current item. 1 means the current item + its children.
+     * It can also be DEPTH_INFINITY if this is enabled in the server.
+     *
+     * @var int
+     */
+    protected $depth = 0;
+
+    /**
+     * The type of request. See the TYPE constants
+     */
+    protected $requestType;
+
+    /**
+     * A list of requested properties
+     *
+     * @var array
+     */
+    protected $properties = [];
+
+    /**
+     * The result of the operation.
+     *
+     * The keys in this array are property names.
+     * The values are an array with two elements: the http status code and then
+     * optionally a value.
+     *
+     * Example:
+     *
+     * [
+     *    "{DAV:}owner" : [404],
+     *    "{DAV:}displayname" : [200, "Admin"]
+     * ]
+     *
+     * @var array
+     */
+    protected $result = [];
+
+    /**
+     * This is used as an internal counter for the number of properties that do
+     * not yet have a value.
+     *
+     * @var int
+     */
+    protected $itemsLeft;
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/PropPatch.php b/vendor/sabre/dav/lib/DAV/PropPatch.php
new file mode 100644
index 000000000..6d599dacc
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/PropPatch.php
@@ -0,0 +1,373 @@
+<?php
+
+namespace Sabre\DAV;
+
+use UnexpectedValueException;
+
+/**
+ * This class represents a set of properties that are going to be updated.
+ *
+ * Usually this is simply a PROPPATCH request, but it can also be used for
+ * internal updates.
+ *
+ * Property updates must always be atomic. This means that a property update
+ * must either completely succeed, or completely fail.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PropPatch {
+
+    /**
+     * Properties that are being updated.
+     *
+     * This is a key-value list. If the value is null, the property is supposed
+     * to be deleted.
+     *
+     * @var array
+     */
+    protected $mutations;
+
+    /**
+     * A list of properties and the result of the update. The result is in the
+     * form of a HTTP status code.
+     *
+     * @var array
+     */
+    protected $result = [];
+
+    /**
+     * This is the list of callbacks when we're performing the actual update.
+     *
+     * @var array
+     */
+    protected $propertyUpdateCallbacks = [];
+
+    /**
+     * This property will be set to true if the operation failed.
+     *
+     * @var bool
+     */
+    protected $failed = false;
+
+    /**
+     * Constructor
+     *
+     * @param array $mutations A list of updates
+     */
+    function __construct(array $mutations) {
+
+        $this->mutations = $mutations;
+
+    }
+
+    /**
+     * Call this function if you wish to handle updating certain properties.
+     * For instance, your class may be responsible for handling updates for the
+     * {DAV:}displayname property.
+     *
+     * In that case, call this method with the first argument
+     * "{DAV:}displayname" and a second argument that's a method that does the
+     * actual updating.
+     *
+     * It's possible to specify more than one property as an array.
+     *
+     * The callback must return a boolean or an it. If the result is true, the
+     * operation was considered successful. If it's false, it's consided
+     * failed.
+     *
+     * If the result is an integer, we'll use that integer as the http status
+     * code associated with the operation.
+     *
+     * @param string|string[] $properties
+     * @param callable $callback
+     * @return void
+     */
+    function handle($properties, callable $callback) {
+
+        $usedProperties = [];
+        foreach ((array)$properties as $propertyName) {
+
+            if (array_key_exists($propertyName, $this->mutations) && !isset($this->result[$propertyName])) {
+
+                $usedProperties[] = $propertyName;
+                // HTTP Accepted
+                $this->result[$propertyName] = 202;
+            }
+
+        }
+
+        // Only registering if there's any unhandled properties.
+        if (!$usedProperties) {
+            return;
+        }
+        $this->propertyUpdateCallbacks[] = [
+            // If the original argument to this method was a string, we need
+            // to also make sure that it stays that way, so the commit function
+            // knows how to format the arguments to the callback.
+            is_string($properties) ? $properties : $usedProperties,
+            $callback
+        ];
+
+    }
+
+    /**
+     * Call this function if you wish to handle _all_ properties that haven't
+     * been handled by anything else yet. Note that you effectively claim with
+     * this that you promise to process _all_ properties that are coming in.
+     *
+     * @param callable $callback
+     * @return void
+     */
+    function handleRemaining(callable $callback) {
+
+        $properties = $this->getRemainingMutations();
+        if (!$properties) {
+            // Nothing to do, don't register callback
+            return;
+        }
+
+        foreach ($properties as $propertyName) {
+            // HTTP Accepted
+            $this->result[$propertyName] = 202;
+
+            $this->propertyUpdateCallbacks[] = [
+                $properties,
+                $callback
+            ];
+        }
+
+    }
+
+    /**
+     * Sets the result code for one or more properties.
+     *
+     * @param string|string[] $properties
+     * @param int $resultCode
+     * @return void
+     */
+    function setResultCode($properties, $resultCode) {
+
+        foreach ((array)$properties as $propertyName) {
+            $this->result[$propertyName] = $resultCode;
+        }
+
+        if ($resultCode >= 400) {
+            $this->failed = true;
+        }
+
+    }
+
+    /**
+     * Sets the result code for all properties that did not have a result yet.
+     *
+     * @param int $resultCode
+     * @return void
+     */
+    function setRemainingResultCode($resultCode) {
+
+        $this->setResultCode(
+            $this->getRemainingMutations(),
+            $resultCode
+        );
+
+    }
+
+    /**
+     * Returns the list of properties that don't have a result code yet.
+     *
+     * This method returns a list of property names, but not its values.
+     *
+     * @return string[]
+     */
+    function getRemainingMutations() {
+
+        $remaining = [];
+        foreach ($this->mutations as $propertyName => $propValue) {
+            if (!isset($this->result[$propertyName])) {
+                $remaining[] = $propertyName;
+            }
+        }
+
+        return $remaining;
+
+    }
+
+    /**
+     * Returns the list of properties that don't have a result code yet.
+     *
+     * This method returns list of properties and their values.
+     *
+     * @return array
+     */
+    function getRemainingValues() {
+
+        $remaining = [];
+        foreach ($this->mutations as $propertyName => $propValue) {
+            if (!isset($this->result[$propertyName])) {
+                $remaining[$propertyName] = $propValue;
+            }
+        }
+
+        return $remaining;
+
+    }
+
+    /**
+     * Performs the actual update, and calls all callbacks.
+     *
+     * This method returns true or false depending on if the operation was
+     * successful.
+     *
+     * @return bool
+     */
+    function commit() {
+
+        // First we validate if every property has a handler
+        foreach ($this->mutations as $propertyName => $value) {
+
+            if (!isset($this->result[$propertyName])) {
+                $this->failed = true;
+                $this->result[$propertyName] = 403;
+            }
+
+        }
+
+        foreach ($this->propertyUpdateCallbacks as $callbackInfo) {
+
+            if ($this->failed) {
+                break;
+            }
+            if (is_string($callbackInfo[0])) {
+                $this->doCallbackSingleProp($callbackInfo[0], $callbackInfo[1]);
+            } else {
+                $this->doCallbackMultiProp($callbackInfo[0], $callbackInfo[1]);
+            }
+
+        }
+
+        /**
+         * If anywhere in this operation updating a property failed, we must
+         * update all other properties accordingly.
+         */
+        if ($this->failed) {
+
+            foreach ($this->result as $propertyName => $status) {
+                if ($status === 202) {
+                    // Failed dependency
+                    $this->result[$propertyName] = 424;
+                }
+            }
+
+        }
+
+        return !$this->failed;
+
+    }
+
+    /**
+     * Executes a property callback with the single-property syntax.
+     *
+     * @param string $propertyName
+     * @param callable $callback
+     * @return void
+     */
+    private function doCallBackSingleProp($propertyName, callable $callback) {
+
+        $result = $callback($this->mutations[$propertyName]);
+        if (is_bool($result)) {
+            if ($result) {
+                if (is_null($this->mutations[$propertyName])) {
+                    // Delete
+                    $result = 204;
+                } else {
+                    // Update
+                    $result = 200;
+                }
+            } else {
+                // Fail
+                $result = 403;
+            }
+        }
+        if (!is_int($result)) {
+            throw new UnexpectedValueException('A callback sent to handle() did not return an int or a bool');
+        }
+        $this->result[$propertyName] = $result;
+        if ($result >= 400) {
+            $this->failed = true;
+        }
+
+    }
+
+    /**
+     * Executes a property callback with the multi-property syntax.
+     *
+     * @param array $propertyList
+     * @param callable $callback
+     * @return void
+     */
+    private function doCallBackMultiProp(array $propertyList, callable $callback) {
+
+        $argument = [];
+        foreach ($propertyList as $propertyName) {
+            $argument[$propertyName] = $this->mutations[$propertyName];
+        }
+
+        $result = $callback($argument);
+
+        if (is_array($result)) {
+            foreach ($propertyList as $propertyName) {
+                if (!isset($result[$propertyName])) {
+                    $resultCode = 500;
+                } else {
+                    $resultCode = $result[$propertyName];
+                }
+                if ($resultCode >= 400) {
+                    $this->failed = true;
+                }
+                $this->result[$propertyName] = $resultCode;
+
+            }
+        } elseif ($result === true) {
+
+            // Success
+            foreach ($argument as $propertyName => $propertyValue) {
+                $this->result[$propertyName] = is_null($propertyValue) ? 204 : 200;
+            }
+
+        } elseif ($result === false) {
+            // Fail :(
+            $this->failed = true;
+            foreach ($propertyList as $propertyName) {
+                $this->result[$propertyName] = 403;
+            }
+        } else {
+            throw new UnexpectedValueException('A callback sent to handle() did not return an array or a bool');
+        }
+
+    }
+
+    /**
+     * Returns the result of the operation.
+     *
+     * @return array
+     */
+    function getResult() {
+
+        return $this->result;
+
+    }
+
+    /**
+     * Returns the full list of mutations
+     *
+     * @return array
+     */
+    function getMutations() {
+
+        return $this->mutations;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/BackendInterface.php b/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/BackendInterface.php
new file mode 100644
index 000000000..31ecafdb2
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/BackendInterface.php
@@ -0,0 +1,80 @@
+<?php
+
+namespace Sabre\DAV\PropertyStorage\Backend;
+
+use Sabre\DAV\PropFind;
+use Sabre\DAV\PropPatch;
+
+/**
+ * Propertystorage backend interface.
+ *
+ * Propertystorage backends must implement this interface to be used by the
+ * propertystorage plugin.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface BackendInterface {
+
+    /**
+     * Fetches properties for a path.
+     *
+     * This method received a PropFind object, which contains all the
+     * information about the properties that need to be fetched.
+     *
+     * Ususually you would just want to call 'get404Properties' on this object,
+     * as this will give you the _exact_ list of properties that need to be
+     * fetched, and haven't yet.
+     *
+     * However, you can also support the 'allprops' property here. In that
+     * case, you should check for $propFind->isAllProps().
+     *
+     * @param string $path
+     * @param PropFind $propFind
+     * @return void
+     */
+    function propFind($path, PropFind $propFind);
+
+    /**
+     * Updates properties for a path
+     *
+     * This method received a PropPatch object, which contains all the
+     * information about the update.
+     *
+     * Usually you would want to call 'handleRemaining' on this object, to get;
+     * a list of all properties that need to be stored.
+     *
+     * @param string $path
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    function propPatch($path, PropPatch $propPatch);
+
+    /**
+     * This method is called after a node is deleted.
+     *
+     * This allows a backend to clean up all associated properties.
+     *
+     * The delete method will get called once for the deletion of an entire
+     * tree.
+     *
+     * @param string $path
+     * @return void
+     */
+    function delete($path);
+
+    /**
+     * This method is called after a successful MOVE
+     *
+     * This should be used to migrate all properties from one path to another.
+     * Note that entire collections may be moved, so ensure that all properties
+     * for children are also moved along.
+     *
+     * @param string $source
+     * @param string $destination
+     * @return void
+     */
+    function move($source, $destination);
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/PDO.php b/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/PDO.php
new file mode 100644
index 000000000..910e4979d
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/PDO.php
@@ -0,0 +1,217 @@
+<?php
+
+namespace Sabre\DAV\PropertyStorage\Backend;
+
+use Sabre\DAV\PropFind;
+use Sabre\DAV\PropPatch;
+use Sabre\DAV\Xml\Property\Complex;
+
+/**
+ * PropertyStorage PDO backend.
+ *
+ * This backend class uses a PDO-enabled database to store webdav properties.
+ * Both sqlite and mysql have been tested.
+ *
+ * The database structure can be found in the examples/sql/ directory.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PDO implements BackendInterface {
+
+    /**
+     * Value is stored as string.
+     */
+    const VT_STRING = 1;
+
+    /**
+     * Value is stored as XML fragment.
+     */
+    const VT_XML = 2;
+
+    /**
+     * Value is stored as a property object.
+     */
+    const VT_OBJECT = 3;
+
+    /**
+     * PDO
+     *
+     * @var \PDO
+     */
+    protected $pdo;
+
+    /**
+     * PDO table name we'll be using
+     *
+     * @var string
+     */
+    public $tableName = 'propertystorage';
+
+    /**
+     * Creates the PDO property storage engine
+     *
+     * @param \PDO $pdo
+     */
+    function __construct(\PDO $pdo) {
+
+        $this->pdo = $pdo;
+
+    }
+
+    /**
+     * Fetches properties for a path.
+     *
+     * This method received a PropFind object, which contains all the
+     * information about the properties that need to be fetched.
+     *
+     * Ususually you would just want to call 'get404Properties' on this object,
+     * as this will give you the _exact_ list of properties that need to be
+     * fetched, and haven't yet.
+     *
+     * However, you can also support the 'allprops' property here. In that
+     * case, you should check for $propFind->isAllProps().
+     *
+     * @param string $path
+     * @param PropFind $propFind
+     * @return void
+     */
+    function propFind($path, PropFind $propFind) {
+
+        if (!$propFind->isAllProps() && count($propFind->get404Properties()) === 0) {
+            return;
+        }
+
+        $query = 'SELECT name, value, valuetype FROM ' . $this->tableName . ' WHERE path = ?';
+        $stmt = $this->pdo->prepare($query);
+        $stmt->execute([$path]);
+
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            switch ($row['valuetype']) {
+                case null :
+                case self::VT_STRING :
+                    $propFind->set($row['name'], $row['value']);
+                    break;
+                case self::VT_XML :
+                    $propFind->set($row['name'], new Complex($row['value']));
+                    break;
+                case self::VT_OBJECT :
+                    $propFind->set($row['name'], unserialize($row['value']));
+                    break;
+            }
+        }
+
+    }
+
+    /**
+     * Updates properties for a path
+     *
+     * This method received a PropPatch object, which contains all the
+     * information about the update.
+     *
+     * Usually you would want to call 'handleRemaining' on this object, to get;
+     * a list of all properties that need to be stored.
+     *
+     * @param string $path
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    function propPatch($path, PropPatch $propPatch) {
+
+        $propPatch->handleRemaining(function($properties) use ($path) {
+
+            $updateStmt = $this->pdo->prepare("REPLACE INTO " . $this->tableName . " (path, name, valuetype, value) VALUES (?, ?, ?, ?)");
+            $deleteStmt = $this->pdo->prepare("DELETE FROM " . $this->tableName . " WHERE path = ? AND name = ?");
+
+            foreach ($properties as $name => $value) {
+
+                if (!is_null($value)) {
+                    if (is_scalar($value)) {
+                        $valueType = self::VT_STRING;
+                    } elseif ($value instanceof Complex) {
+                        $valueType = self::VT_XML;
+                        $value = $value->getXml();
+                    } else {
+                        $valueType = self::VT_OBJECT;
+                        $value = serialize($value);
+                    }
+                    $updateStmt->execute([$path, $name, $valueType, $value]);
+                } else {
+                    $deleteStmt->execute([$path, $name]);
+                }
+
+            }
+
+            return true;
+
+        });
+
+    }
+
+    /**
+     * This method is called after a node is deleted.
+     *
+     * This allows a backend to clean up all associated properties.
+     *
+     * The delete method will get called once for the deletion of an entire
+     * tree.
+     *
+     * @param string $path
+     * @return void
+     */
+    function delete($path) {
+
+        $stmt = $this->pdo->prepare("DELETE FROM " . $this->tableName . "  WHERE path = ? OR path LIKE ? ESCAPE '='");
+        $childPath = strtr(
+            $path,
+            [
+                '=' => '==',
+                '%' => '=%',
+                '_' => '=_'
+            ]
+        ) . '/%';
+
+        $stmt->execute([$path, $childPath]);
+
+    }
+
+    /**
+     * This method is called after a successful MOVE
+     *
+     * This should be used to migrate all properties from one path to another.
+     * Note that entire collections may be moved, so ensure that all properties
+     * for children are also moved along.
+     *
+     * @param string $source
+     * @param string $destination
+     * @return void
+     */
+    function move($source, $destination) {
+
+        // I don't know a way to write this all in a single sql query that's
+        // also compatible across db engines, so we're letting PHP do all the
+        // updates. Much slower, but it should still be pretty fast in most
+        // cases.
+        $select = $this->pdo->prepare('SELECT id, path FROM ' . $this->tableName . '  WHERE path = ? OR path LIKE ?');
+        $select->execute([$source, $source . '/%']);
+
+        $update = $this->pdo->prepare('UPDATE ' . $this->tableName . ' SET path = ? WHERE id = ?');
+        while ($row = $select->fetch(\PDO::FETCH_ASSOC)) {
+
+            // Sanity check. SQL may select too many records, such as records
+            // with different cases.
+            if ($row['path'] !== $source && strpos($row['path'], $source . '/') !== 0) continue;
+
+            $trailingPart = substr($row['path'], strlen($source) + 1);
+            $newPath = $destination;
+            if ($trailingPart) {
+                $newPath .= '/' . $trailingPart;
+            }
+            $update->execute([$newPath, $row['id']]);
+
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/PropertyStorage/Plugin.php b/vendor/sabre/dav/lib/DAV/PropertyStorage/Plugin.php
new file mode 100644
index 000000000..0c28b7882
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/PropertyStorage/Plugin.php
@@ -0,0 +1,180 @@
+<?php
+
+namespace Sabre\DAV\PropertyStorage;
+
+use Sabre\DAV\Server;
+use Sabre\DAV\ServerPlugin;
+use Sabre\DAV\PropPatch;
+use Sabre\DAV\PropFind;
+use Sabre\DAV\INode;
+
+/**
+ * PropertyStorage Plugin.
+ *
+ * Adding this plugin to your server allows clients to store any arbitrary
+ * WebDAV property.
+ *
+ * See:
+ *   http://sabre.io/dav/property-storage/
+ *
+ * for more information.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends ServerPlugin {
+
+    /**
+     * If you only want this plugin to store properties for a limited set of
+     * paths, you can use a pathFilter to do this.
+     *
+     * The pathFilter should be a callable. The callable retrieves a path as
+     * its argument, and should return true or false wether it allows
+     * properties to be stored.
+     *
+     * @var callable
+     */
+    public $pathFilter;
+
+    /**
+     * Creates the plugin
+     *
+     * @param Backend\BackendInterface $backend
+     */
+    function __construct(Backend\BackendInterface $backend) {
+
+        $this->backend = $backend;
+
+    }
+
+    /**
+     * This initializes the plugin.
+     *
+     * This function is called by Sabre\DAV\Server, after
+     * addPlugin is called.
+     *
+     * This method should set up the required event subscriptions.
+     *
+     * @param Server $server
+     * @return void
+     */
+    function initialize(Server $server) {
+
+        $server->on('propFind',    [$this, 'propFind'], 130);
+        $server->on('propPatch',   [$this, 'propPatch'], 300);
+        $server->on('afterMove',   [$this, 'afterMove']);
+        $server->on('afterUnbind', [$this, 'afterUnbind']);
+
+    }
+
+    /**
+     * Called during PROPFIND operations.
+     *
+     * If there's any requested properties that don't have a value yet, this
+     * plugin will look in the property storage backend to find them.
+     *
+     * @param PropFind $propFind
+     * @param INode $node
+     * @return void
+     */
+    function propFind(PropFind $propFind, INode $node) {
+
+        $path = $propFind->getPath();
+        $pathFilter = $this->pathFilter;
+        if ($pathFilter && !$pathFilter($path)) return;
+        $this->backend->propFind($propFind->getPath(), $propFind);
+
+    }
+
+    /**
+     * Called during PROPPATCH operations
+     *
+     * If there's any updated properties that haven't been stored, the
+     * propertystorage backend can handle it.
+     *
+     * @param string $path
+     * @param PropPatch $propPatch
+     * @return void
+     */
+    function propPatch($path, PropPatch $propPatch) {
+
+        $pathFilter = $this->pathFilter;
+        if ($pathFilter && !$pathFilter($path)) return;
+        $this->backend->propPatch($path, $propPatch);
+
+    }
+
+    /**
+     * Called after a node is deleted.
+     *
+     * This allows the backend to clean up any properties still in the
+     * database.
+     *
+     * @param string $path
+     * @return void
+     */
+    function afterUnbind($path) {
+
+        $pathFilter = $this->pathFilter;
+        if ($pathFilter && !$pathFilter($path)) return;
+        $this->backend->delete($path);
+
+    }
+
+    /**
+     * Called after a node is moved.
+     *
+     * This allows the backend to move all the associated properties.
+     *
+     * @param string $source
+     * @param string $destination
+     * @return void
+     */
+    function afterMove($source, $destination) {
+
+        $pathFilter = $this->pathFilter;
+        if ($pathFilter && !$pathFilter($source)) return;
+        // If the destination is filtered, afterUnbind will handle cleaning up
+        // the properties.
+        if ($pathFilter && !$pathFilter($destination)) return;
+
+        $this->backend->move($source, $destination);
+
+    }
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using \Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'property-storage';
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'This plugin allows any arbitrary WebDAV property to be set on any resource.',
+            'link'        => 'http://sabre.io/dav/property-storage/',
+        ];
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/DAV/Server.php b/vendor/sabre/dav/lib/DAV/Server.php
new file mode 100644
index 000000000..b37652812
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Server.php
@@ -0,0 +1,1627 @@
+<?php
+
+namespace Sabre\DAV;
+
+use Sabre\Event\EventEmitter;
+use Sabre\HTTP;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Sabre\HTTP\URLUtil;
+use Sabre\Uri;
+
+/**
+ * Main DAV server class
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Server extends EventEmitter {
+
+    /**
+     * Infinity is used for some request supporting the HTTP Depth header and indicates that the operation should traverse the entire tree
+     */
+    const DEPTH_INFINITY = -1;
+
+    /**
+     * XML namespace for all SabreDAV related elements
+     */
+    const NS_SABREDAV = 'http://sabredav.org/ns';
+
+    /**
+     * The tree object
+     *
+     * @var Sabre\DAV\Tree
+     */
+    public $tree;
+
+    /**
+     * The base uri
+     *
+     * @var string
+     */
+    protected $baseUri = null;
+
+    /**
+     * httpResponse
+     *
+     * @var Sabre\HTTP\Response
+     */
+    public $httpResponse;
+
+    /**
+     * httpRequest
+     *
+     * @var Sabre\HTTP\Request
+     */
+    public $httpRequest;
+
+    /**
+     * PHP HTTP Sapi
+     *
+     * @var Sabre\HTTP\Sapi
+     */
+    public $sapi;
+
+    /**
+     * The list of plugins
+     *
+     * @var array
+     */
+    protected $plugins = [];
+
+    /**
+     * This property will be filled with a unique string that describes the
+     * transaction. This is useful for performance measuring and logging
+     * purposes.
+     *
+     * By default it will just fill it with a lowercased HTTP method name, but
+     * plugins override this. For example, the WebDAV-Sync sync-collection
+     * report will set this to 'report-sync-collection'.
+     *
+     * @var string
+     */
+    public $transactionType;
+
+    /**
+     * This is a list of properties that are always server-controlled, and
+     * must not get modified with PROPPATCH.
+     *
+     * Plugins may add to this list.
+     *
+     * @var string[]
+     */
+    public $protectedProperties = [
+
+        // RFC4918
+        '{DAV:}getcontentlength',
+        '{DAV:}getetag',
+        '{DAV:}getlastmodified',
+        '{DAV:}lockdiscovery',
+        '{DAV:}supportedlock',
+
+        // RFC4331
+        '{DAV:}quota-available-bytes',
+        '{DAV:}quota-used-bytes',
+
+        // RFC3744
+        '{DAV:}supported-privilege-set',
+        '{DAV:}current-user-privilege-set',
+        '{DAV:}acl',
+        '{DAV:}acl-restrictions',
+        '{DAV:}inherited-acl-set',
+
+        // RFC3253
+        '{DAV:}supported-method-set',
+        '{DAV:}supported-report-set',
+
+        // RFC6578
+        '{DAV:}sync-token',
+
+        // calendarserver.org extensions
+        '{http://calendarserver.org/ns/}ctag',
+
+        // sabredav extensions
+        '{http://sabredav.org/ns}sync-token',
+
+    ];
+
+    /**
+     * This is a flag that allow or not showing file, line and code
+     * of the exception in the returned XML
+     *
+     * @var bool
+     */
+    public $debugExceptions = false;
+
+    /**
+     * This property allows you to automatically add the 'resourcetype' value
+     * based on a node's classname or interface.
+     *
+     * The preset ensures that {DAV:}collection is automatically added for nodes
+     * implementing Sabre\DAV\ICollection.
+     *
+     * @var array
+     */
+    public $resourceTypeMapping = [
+        'Sabre\\DAV\\ICollection' => '{DAV:}collection',
+    ];
+
+    /**
+     * This property allows the usage of Depth: infinity on PROPFIND requests.
+     *
+     * By default Depth: infinity is treated as Depth: 1. Allowing Depth:
+     * infinity is potentially risky, as it allows a single client to do a full
+     * index of the webdav server, which is an easy DoS attack vector.
+     *
+     * Only turn this on if you know what you're doing.
+     *
+     * @var bool
+     */
+    public $enablePropfindDepthInfinity = false;
+
+    /**
+     * Reference to the XML utility object.
+     *
+     * @var Xml\Service
+     */
+    public $xml;
+
+    /**
+     * If this setting is turned off, SabreDAV's version number will be hidden
+     * from various places.
+     *
+     * Some people feel this is a good security measure.
+     *
+     * @var bool
+     */
+    static $exposeVersion = true;
+
+    /**
+     * Sets up the server
+     *
+     * If a Sabre\DAV\Tree object is passed as an argument, it will
+     * use it as the directory tree. If a Sabre\DAV\INode is passed, it
+     * will create a Sabre\DAV\Tree and use the node as the root.
+     *
+     * If nothing is passed, a Sabre\DAV\SimpleCollection is created in
+     * a Sabre\DAV\Tree.
+     *
+     * If an array is passed, we automatically create a root node, and use
+     * the nodes in the array as top-level children.
+     *
+     * @param Tree|INode|array|null $treeOrNode The tree object
+     */
+    function __construct($treeOrNode = null) {
+
+        if ($treeOrNode instanceof Tree) {
+            $this->tree = $treeOrNode;
+        } elseif ($treeOrNode instanceof INode) {
+            $this->tree = new Tree($treeOrNode);
+        } elseif (is_array($treeOrNode)) {
+
+            // If it's an array, a list of nodes was passed, and we need to
+            // create the root node.
+            foreach ($treeOrNode as $node) {
+                if (!($node instanceof INode)) {
+                    throw new Exception('Invalid argument passed to constructor. If you\'re passing an array, all the values must implement Sabre\\DAV\\INode');
+                }
+            }
+
+            $root = new SimpleCollection('root', $treeOrNode);
+            $this->tree = new Tree($root);
+
+        } elseif (is_null($treeOrNode)) {
+            $root = new SimpleCollection('root');
+            $this->tree = new Tree($root);
+        } else {
+            throw new Exception('Invalid argument passed to constructor. Argument must either be an instance of Sabre\\DAV\\Tree, Sabre\\DAV\\INode, an array or null');
+        }
+
+        $this->xml = new Xml\Service();
+        $this->sapi = new HTTP\Sapi();
+        $this->httpResponse = new HTTP\Response();
+        $this->httpRequest = $this->sapi->getRequest();
+        $this->addPlugin(new CorePlugin());
+
+    }
+
+    /**
+     * Starts the DAV Server
+     *
+     * @return void
+     */
+    function exec() {
+
+        try {
+
+            // If nginx (pre-1.2) is used as a proxy server, and SabreDAV as an
+            // origin, we must make sure we send back HTTP/1.0 if this was
+            // requested.
+            // This is mainly because nginx doesn't support Chunked Transfer
+            // Encoding, and this forces the webserver SabreDAV is running on,
+            // to buffer entire responses to calculate Content-Length.
+            $this->httpResponse->setHTTPVersion($this->httpRequest->getHTTPVersion());
+
+            // Setting the base url
+            $this->httpRequest->setBaseUrl($this->getBaseUri());
+            $this->invokeMethod($this->httpRequest, $this->httpResponse);
+
+        } catch (\Exception $e) {
+
+            try {
+                $this->emit('exception', [$e]);
+            } catch (\Exception $ignore) {
+            }
+            $DOM = new \DOMDocument('1.0', 'utf-8');
+            $DOM->formatOutput = true;
+
+            $error = $DOM->createElementNS('DAV:', 'd:error');
+            $error->setAttribute('xmlns:s', self::NS_SABREDAV);
+            $DOM->appendChild($error);
+
+            $h = function($v) {
+
+                return htmlspecialchars($v, ENT_NOQUOTES, 'UTF-8');
+
+            };
+
+            if (self::$exposeVersion) {
+                $error->appendChild($DOM->createElement('s:sabredav-version', $h(Version::VERSION)));
+            }
+
+            $error->appendChild($DOM->createElement('s:exception', $h(get_class($e))));
+            $error->appendChild($DOM->createElement('s:message', $h($e->getMessage())));
+            if ($this->debugExceptions) {
+                $error->appendChild($DOM->createElement('s:file', $h($e->getFile())));
+                $error->appendChild($DOM->createElement('s:line', $h($e->getLine())));
+                $error->appendChild($DOM->createElement('s:code', $h($e->getCode())));
+                $error->appendChild($DOM->createElement('s:stacktrace', $h($e->getTraceAsString())));
+            }
+
+            if ($this->debugExceptions) {
+                $previous = $e;
+                while ($previous = $previous->getPrevious()) {
+                    $xPrevious = $DOM->createElement('s:previous-exception');
+                    $xPrevious->appendChild($DOM->createElement('s:exception', $h(get_class($previous))));
+                    $xPrevious->appendChild($DOM->createElement('s:message', $h($previous->getMessage())));
+                    $xPrevious->appendChild($DOM->createElement('s:file', $h($previous->getFile())));
+                    $xPrevious->appendChild($DOM->createElement('s:line', $h($previous->getLine())));
+                    $xPrevious->appendChild($DOM->createElement('s:code', $h($previous->getCode())));
+                    $xPrevious->appendChild($DOM->createElement('s:stacktrace', $h($previous->getTraceAsString())));
+                    $error->appendChild($xPrevious);
+                }
+            }
+
+
+            if ($e instanceof Exception) {
+
+                $httpCode = $e->getHTTPCode();
+                $e->serialize($this, $error);
+                $headers = $e->getHTTPHeaders($this);
+
+            } else {
+
+                $httpCode = 500;
+                $headers = [];
+
+            }
+            $headers['Content-Type'] = 'application/xml; charset=utf-8';
+
+            $this->httpResponse->setStatus($httpCode);
+            $this->httpResponse->setHeaders($headers);
+            $this->httpResponse->setBody($DOM->saveXML());
+            $this->sapi->sendResponse($this->httpResponse);
+
+        }
+
+    }
+
+    /**
+     * Sets the base server uri
+     *
+     * @param string $uri
+     * @return void
+     */
+    function setBaseUri($uri) {
+
+        // If the baseUri does not end with a slash, we must add it
+        if ($uri[strlen($uri) - 1] !== '/')
+            $uri .= '/';
+
+        $this->baseUri = $uri;
+
+    }
+
+    /**
+     * Returns the base responding uri
+     *
+     * @return string
+     */
+    function getBaseUri() {
+
+        if (is_null($this->baseUri)) $this->baseUri = $this->guessBaseUri();
+        return $this->baseUri;
+
+    }
+
+    /**
+     * This method attempts to detect the base uri.
+     * Only the PATH_INFO variable is considered.
+     *
+     * If this variable is not set, the root (/) is assumed.
+     *
+     * @return string
+     */
+    function guessBaseUri() {
+
+        $pathInfo = $this->httpRequest->getRawServerValue('PATH_INFO');
+        $uri = $this->httpRequest->getRawServerValue('REQUEST_URI');
+
+        // If PATH_INFO is found, we can assume it's accurate.
+        if (!empty($pathInfo)) {
+
+            // We need to make sure we ignore the QUERY_STRING part
+            if ($pos = strpos($uri, '?'))
+                $uri = substr($uri, 0, $pos);
+
+            // PATH_INFO is only set for urls, such as: /example.php/path
+            // in that case PATH_INFO contains '/path'.
+            // Note that REQUEST_URI is percent encoded, while PATH_INFO is
+            // not, Therefore they are only comparable if we first decode
+            // REQUEST_INFO as well.
+            $decodedUri = URLUtil::decodePath($uri);
+
+            // A simple sanity check:
+            if (substr($decodedUri, strlen($decodedUri) - strlen($pathInfo)) === $pathInfo) {
+                $baseUri = substr($decodedUri, 0, strlen($decodedUri) - strlen($pathInfo));
+                return rtrim($baseUri, '/') . '/';
+            }
+
+            throw new Exception('The REQUEST_URI (' . $uri . ') did not end with the contents of PATH_INFO (' . $pathInfo . '). This server might be misconfigured.');
+
+        }
+
+        // The last fallback is that we're just going to assume the server root.
+        return '/';
+
+    }
+
+    /**
+     * Adds a plugin to the server
+     *
+     * For more information, console the documentation of Sabre\DAV\ServerPlugin
+     *
+     * @param ServerPlugin $plugin
+     * @return void
+     */
+    function addPlugin(ServerPlugin $plugin) {
+
+        $this->plugins[$plugin->getPluginName()] = $plugin;
+        $plugin->initialize($this);
+
+    }
+
+    /**
+     * Returns an initialized plugin by it's name.
+     *
+     * This function returns null if the plugin was not found.
+     *
+     * @param string $name
+     * @return ServerPlugin
+     */
+    function getPlugin($name) {
+
+        if (isset($this->plugins[$name]))
+            return $this->plugins[$name];
+
+        return null;
+
+    }
+
+    /**
+     * Returns all plugins
+     *
+     * @return array
+     */
+    function getPlugins() {
+
+        return $this->plugins;
+
+    }
+
+    /**
+     * Handles a http request, and execute a method based on its name
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @param $sendResponse Whether to send the HTTP response to the DAV client.
+     * @return void
+     */
+    function invokeMethod(RequestInterface $request, ResponseInterface $response, $sendResponse = true) {
+
+        $method = $request->getMethod();
+
+        if (!$this->emit('beforeMethod:' . $method, [$request, $response])) return;
+        if (!$this->emit('beforeMethod', [$request, $response])) return;
+
+        if (self::$exposeVersion) {
+            $response->setHeader('X-Sabre-Version', Version::VERSION);
+        }
+
+        $this->transactionType = strtolower($method);
+
+        if (!$this->checkPreconditions($request, $response)) {
+            $this->sapi->sendResponse($response);
+            return;
+        }
+
+        if ($this->emit('method:' . $method, [$request, $response])) {
+            if ($this->emit('method', [$request, $response])) {
+                $exMessage = "There was no plugin in the system that was willing to handle this " . $method . " method.";
+                if ($method === "GET") {
+                    $exMessage .= " Enable the Browser plugin to get a better result here.";
+                }
+
+                // Unsupported method
+                throw new Exception\NotImplemented($exMessage);
+            }
+        }
+
+        if (!$this->emit('afterMethod:' . $method, [$request, $response])) return;
+        if (!$this->emit('afterMethod', [$request, $response])) return;
+
+        if ($response->getStatus() === null) {
+            throw new Exception('No subsystem set a valid HTTP status code. Something must have interrupted the request without providing further detail.');
+        }
+        if ($sendResponse) {
+            $this->sapi->sendResponse($response);
+            $this->emit('afterResponse', [$request, $response]);
+        }
+
+    }
+
+    // {{{ HTTP/WebDAV protocol helpers
+
+    /**
+     * Returns an array with all the supported HTTP methods for a specific uri.
+     *
+     * @param string $path
+     * @return array
+     */
+    function getAllowedMethods($path) {
+
+        $methods = [
+            'OPTIONS',
+            'GET',
+            'HEAD',
+            'DELETE',
+            'PROPFIND',
+            'PUT',
+            'PROPPATCH',
+            'COPY',
+            'MOVE',
+            'REPORT'
+        ];
+
+        // The MKCOL is only allowed on an unmapped uri
+        try {
+            $this->tree->getNodeForPath($path);
+        } catch (Exception\NotFound $e) {
+            $methods[] = 'MKCOL';
+        }
+
+        // We're also checking if any of the plugins register any new methods
+        foreach ($this->plugins as $plugin) $methods = array_merge($methods, $plugin->getHTTPMethods($path));
+        array_unique($methods);
+
+        return $methods;
+
+    }
+
+    /**
+     * Gets the uri for the request, keeping the base uri into consideration
+     *
+     * @return string
+     */
+    function getRequestUri() {
+
+        return $this->calculateUri($this->httpRequest->getUrl());
+
+    }
+
+    /**
+     * Turns a URI such as the REQUEST_URI into a local path.
+     *
+     * This method:
+     *   * strips off the base path
+     *   * normalizes the path
+     *   * uri-decodes the path
+     *
+     * @param string $uri
+     * @throws Exception\Forbidden A permission denied exception is thrown whenever there was an attempt to supply a uri outside of the base uri
+     * @return string
+     */
+    function calculateUri($uri) {
+
+        if ($uri[0] != '/' && strpos($uri, '://')) {
+
+            $uri = parse_url($uri, PHP_URL_PATH);
+
+        }
+
+        $uri = Uri\normalize(str_replace('//', '/', $uri));
+        $baseUri = Uri\normalize($this->getBaseUri());
+
+        if (strpos($uri, $baseUri) === 0) {
+
+            return trim(URLUtil::decodePath(substr($uri, strlen($baseUri))), '/');
+
+        // A special case, if the baseUri was accessed without a trailing
+        // slash, we'll accept it as well.
+        } elseif ($uri . '/' === $baseUri) {
+
+            return '';
+
+        } else {
+
+            throw new Exception\Forbidden('Requested uri (' . $uri . ') is out of base uri (' . $this->getBaseUri() . ')');
+
+        }
+
+    }
+
+    /**
+     * Returns the HTTP depth header
+     *
+     * This method returns the contents of the HTTP depth request header. If the depth header was 'infinity' it will return the Sabre\DAV\Server::DEPTH_INFINITY object
+     * It is possible to supply a default depth value, which is used when the depth header has invalid content, or is completely non-existent
+     *
+     * @param mixed $default
+     * @return int
+     */
+    function getHTTPDepth($default = self::DEPTH_INFINITY) {
+
+        // If its not set, we'll grab the default
+        $depth = $this->httpRequest->getHeader('Depth');
+
+        if (is_null($depth)) return $default;
+
+        if ($depth == 'infinity') return self::DEPTH_INFINITY;
+
+
+        // If its an unknown value. we'll grab the default
+        if (!ctype_digit($depth)) return $default;
+
+        return (int)$depth;
+
+    }
+
+    /**
+     * Returns the HTTP range header
+     *
+     * This method returns null if there is no well-formed HTTP range request
+     * header or array($start, $end).
+     *
+     * The first number is the offset of the first byte in the range.
+     * The second number is the offset of the last byte in the range.
+     *
+     * If the second offset is null, it should be treated as the offset of the last byte of the entity
+     * If the first offset is null, the second offset should be used to retrieve the last x bytes of the entity
+     *
+     * @return array|null
+     */
+    function getHTTPRange() {
+
+        $range = $this->httpRequest->getHeader('range');
+        if (is_null($range)) return null;
+
+        // Matching "Range: bytes=1234-5678: both numbers are optional
+
+        if (!preg_match('/^bytes=([0-9]*)-([0-9]*)$/i', $range, $matches)) return null;
+
+        if ($matches[1] === '' && $matches[2] === '') return null;
+
+        return [
+            $matches[1] !== '' ? $matches[1] : null,
+            $matches[2] !== '' ? $matches[2] : null,
+        ];
+
+    }
+
+    /**
+     * Returns the HTTP Prefer header information.
+     *
+     * The prefer header is defined in:
+     * http://tools.ietf.org/html/draft-snell-http-prefer-14
+     *
+     * This method will return an array with options.
+     *
+     * Currently, the following options may be returned:
+     *  [
+     *      'return-asynch'         => true,
+     *      'return-minimal'        => true,
+     *      'return-representation' => true,
+     *      'wait'                  => 30,
+     *      'strict'                => true,
+     *      'lenient'               => true,
+     *  ]
+     *
+     * This method also supports the Brief header, and will also return
+     * 'return-minimal' if the brief header was set to 't'.
+     *
+     * For the boolean options, false will be returned if the headers are not
+     * specified. For the integer options it will be 'null'.
+     *
+     * @return array
+     */
+    function getHTTPPrefer() {
+
+        $result = [
+            // can be true or false
+            'respond-async' => false,
+            // Could be set to 'representation' or 'minimal'.
+            'return'        => null,
+            // Used as a timeout, is usually a number.
+            'wait'          => null,
+            // can be 'strict' or 'lenient'.
+            'handling'      => false,
+        ];
+
+        if ($prefer = $this->httpRequest->getHeader('Prefer')) {
+
+            $result = array_merge(
+                $result,
+                \Sabre\HTTP\parsePrefer($prefer)
+            );
+
+        } elseif ($this->httpRequest->getHeader('Brief') == 't') {
+            $result['return'] = 'minimal';
+        }
+
+        return $result;
+
+    }
+
+
+    /**
+     * Returns information about Copy and Move requests
+     *
+     * This function is created to help getting information about the source and the destination for the
+     * WebDAV MOVE and COPY HTTP request. It also validates a lot of information and throws proper exceptions
+     *
+     * The returned value is an array with the following keys:
+     *   * destination - Destination path
+     *   * destinationExists - Whether or not the destination is an existing url (and should therefore be overwritten)
+     *
+     * @param RequestInterface $request
+     * @throws Exception\BadRequest upon missing or broken request headers
+     * @throws Exception\UnsupportedMediaType when trying to copy into a
+     *         non-collection.
+     * @throws Exception\PreconditionFailed If overwrite is set to false, but
+     *         the destination exists.
+     * @throws Exception\Forbidden when source and destination paths are
+     *         identical.
+     * @throws Exception\Conflict When trying to copy a node into its own
+     *         subtree.
+     * @return array
+     */
+    function getCopyAndMoveInfo(RequestInterface $request) {
+
+        // Collecting the relevant HTTP headers
+        if (!$request->getHeader('Destination')) throw new Exception\BadRequest('The destination header was not supplied');
+        $destination = $this->calculateUri($request->getHeader('Destination'));
+        $overwrite = $request->getHeader('Overwrite');
+        if (!$overwrite) $overwrite = 'T';
+        if (strtoupper($overwrite) == 'T') $overwrite = true;
+        elseif (strtoupper($overwrite) == 'F') $overwrite = false;
+        // We need to throw a bad request exception, if the header was invalid
+        else throw new Exception\BadRequest('The HTTP Overwrite header should be either T or F');
+
+        list($destinationDir) = URLUtil::splitPath($destination);
+
+        try {
+            $destinationParent = $this->tree->getNodeForPath($destinationDir);
+            if (!($destinationParent instanceof ICollection)) throw new Exception\UnsupportedMediaType('The destination node is not a collection');
+        } catch (Exception\NotFound $e) {
+
+            // If the destination parent node is not found, we throw a 409
+            throw new Exception\Conflict('The destination node is not found');
+        }
+
+        try {
+
+            $destinationNode = $this->tree->getNodeForPath($destination);
+
+            // If this succeeded, it means the destination already exists
+            // we'll need to throw precondition failed in case overwrite is false
+            if (!$overwrite) throw new Exception\PreconditionFailed('The destination node already exists, and the overwrite header is set to false', 'Overwrite');
+
+        } catch (Exception\NotFound $e) {
+
+            // Destination didn't exist, we're all good
+            $destinationNode = false;
+
+        }
+
+        $requestPath = $request->getPath();
+        if ($destination === $requestPath) {
+            throw new Exception\Forbidden('Source and destination uri are identical.');
+        }
+        if (substr($destination, 0, strlen($requestPath) + 1) === $requestPath . '/') {
+            throw new Exception\Conflict('The destination may not be part of the same subtree as the source path.');
+        }
+
+        // These are the three relevant properties we need to return
+        return [
+            'destination'       => $destination,
+            'destinationExists' => !!$destinationNode,
+            'destinationNode'   => $destinationNode,
+        ];
+
+    }
+
+    /**
+     * Returns a list of properties for a path
+     *
+     * This is a simplified version getPropertiesForPath. If you aren't
+     * interested in status codes, but you just want to have a flat list of
+     * properties, use this method.
+     *
+     * Please note though that any problems related to retrieving properties,
+     * such as permission issues will just result in an empty array being
+     * returned.
+     *
+     * @param string $path
+     * @param array $propertyNames
+     */
+    function getProperties($path, $propertyNames) {
+
+        $result = $this->getPropertiesForPath($path, $propertyNames, 0);
+        if (isset($result[0][200])) {
+            return $result[0][200];
+        } else {
+            return [];
+        }
+
+    }
+
+    /**
+     * A kid-friendly way to fetch properties for a node's children.
+     *
+     * The returned array will be indexed by the path of the of child node.
+     * Only properties that are actually found will be returned.
+     *
+     * The parent node will not be returned.
+     *
+     * @param string $path
+     * @param array $propertyNames
+     * @return array
+     */
+    function getPropertiesForChildren($path, $propertyNames) {
+
+        $result = [];
+        foreach ($this->getPropertiesForPath($path, $propertyNames, 1) as $k => $row) {
+
+            // Skipping the parent path
+            if ($k === 0) continue;
+
+            $result[$row['href']] = $row[200];
+
+        }
+        return $result;
+
+    }
+
+    /**
+     * Returns a list of HTTP headers for a particular resource
+     *
+     * The generated http headers are based on properties provided by the
+     * resource. The method basically provides a simple mapping between
+     * DAV property and HTTP header.
+     *
+     * The headers are intended to be used for HEAD and GET requests.
+     *
+     * @param string $path
+     * @return array
+     */
+    function getHTTPHeaders($path) {
+
+        $propertyMap = [
+            '{DAV:}getcontenttype'   => 'Content-Type',
+            '{DAV:}getcontentlength' => 'Content-Length',
+            '{DAV:}getlastmodified'  => 'Last-Modified',
+            '{DAV:}getetag'          => 'ETag',
+        ];
+
+        $properties = $this->getProperties($path, array_keys($propertyMap));
+
+        $headers = [];
+        foreach ($propertyMap as $property => $header) {
+            if (!isset($properties[$property])) continue;
+
+            if (is_scalar($properties[$property])) {
+                $headers[$header] = $properties[$property];
+
+            // GetLastModified gets special cased
+            } elseif ($properties[$property] instanceof Xml\Property\GetLastModified) {
+                $headers[$header] = HTTP\Util::toHTTPDate($properties[$property]->getTime());
+            }
+
+        }
+
+        return $headers;
+
+    }
+
+    /**
+     * Small helper to support PROPFIND with DEPTH_INFINITY.
+     *
+     * @param array[] $propFindRequests
+     * @param PropFind $propFind
+     * @return void
+     */
+    private function addPathNodesRecursively(&$propFindRequests, PropFind $propFind) {
+
+        $newDepth = $propFind->getDepth();
+        $path = $propFind->getPath();
+
+        if ($newDepth !== self::DEPTH_INFINITY) {
+            $newDepth--;
+        }
+
+        foreach ($this->tree->getChildren($path) as $childNode) {
+            $subPropFind = clone $propFind;
+            $subPropFind->setDepth($newDepth);
+            if ($path !== '') {
+                $subPath = $path . '/' . $childNode->getName();
+            } else {
+                $subPath = $childNode->getName();
+            }
+            $subPropFind->setPath($subPath);
+
+            $propFindRequests[] = [
+                $subPropFind,
+                $childNode
+            ];
+
+            if (($newDepth === self::DEPTH_INFINITY || $newDepth >= 1) && $childNode instanceof ICollection) {
+                $this->addPathNodesRecursively($propFindRequests, $subPropFind);
+            }
+
+        }
+    }
+
+    /**
+     * Returns a list of properties for a given path
+     *
+     * The path that should be supplied should have the baseUrl stripped out
+     * The list of properties should be supplied in Clark notation. If the list is empty
+     * 'allprops' is assumed.
+     *
+     * If a depth of 1 is requested child elements will also be returned.
+     *
+     * @param string $path
+     * @param array $propertyNames
+     * @param int $depth
+     * @return array
+     */
+    function getPropertiesForPath($path, $propertyNames = [], $depth = 0) {
+
+        // The only two options for the depth of a propfind is 0 or 1 - as long as depth infinity is not enabled
+        if (!$this->enablePropfindDepthInfinity && $depth != 0) $depth = 1;
+
+        $path = trim($path, '/');
+
+        $propFindType = $propertyNames ? PropFind::NORMAL : PropFind::ALLPROPS;
+        $propFind = new PropFind($path, (array)$propertyNames, $depth, $propFindType);
+
+        $parentNode = $this->tree->getNodeForPath($path);
+
+        $propFindRequests = [[
+            $propFind,
+            $parentNode
+        ]];
+
+        if (($depth > 0 || $depth === self::DEPTH_INFINITY) && $parentNode instanceof ICollection) {
+            $this->addPathNodesRecursively($propFindRequests, $propFind);
+        }
+
+        $returnPropertyList = [];
+
+        foreach ($propFindRequests as $propFindRequest) {
+
+            list($propFind, $node) = $propFindRequest;
+            $r = $this->getPropertiesByNode($propFind, $node);
+            if ($r) {
+                $result = $propFind->getResultForMultiStatus();
+                $result['href'] = $propFind->getPath();
+
+                // WebDAV recommends adding a slash to the path, if the path is
+                // a collection.
+                // Furthermore, iCal also demands this to be the case for
+                // principals. This is non-standard, but we support it.
+                $resourceType = $this->getResourceTypeForNode($node);
+                if (in_array('{DAV:}collection', $resourceType) || in_array('{DAV:}principal', $resourceType)) {
+                    $result['href'] .= '/';
+                }
+                $returnPropertyList[] = $result;
+            }
+
+        }
+
+        return $returnPropertyList;
+
+    }
+
+    /**
+     * Returns a list of properties for a list of paths.
+     *
+     * The path that should be supplied should have the baseUrl stripped out
+     * The list of properties should be supplied in Clark notation. If the list is empty
+     * 'allprops' is assumed.
+     *
+     * The result is returned as an array, with paths for it's keys.
+     * The result may be returned out of order.
+     *
+     * @param array $paths
+     * @param array $propertyNames
+     * @return array
+     */
+    function getPropertiesForMultiplePaths(array $paths, array $propertyNames = []) {
+
+        $result = [
+        ];
+
+        $nodes = $this->tree->getMultipleNodes($paths);
+
+        foreach ($nodes as $path => $node) {
+
+            $propFind = new PropFind($path, $propertyNames);
+            $r = $this->getPropertiesByNode($propFind, $node);
+            if ($r) {
+                $result[$path] = $propFind->getResultForMultiStatus();
+                $result[$path]['href'] = $path;
+
+                $resourceType = $this->getResourceTypeForNode($node);
+                if (in_array('{DAV:}collection', $resourceType) || in_array('{DAV:}principal', $resourceType)) {
+                    $result[$path]['href'] .= '/';
+                }
+            }
+
+        }
+
+        return $result;
+
+    }
+
+
+    /**
+     * Determines all properties for a node.
+     *
+     * This method tries to grab all properties for a node. This method is used
+     * internally getPropertiesForPath and a few others.
+     *
+     * It could be useful to call this, if you already have an instance of your
+     * target node and simply want to run through the system to get a correct
+     * list of properties.
+     *
+     * @param PropFind $propFind
+     * @param INode $node
+     * @return bool
+     */
+    function getPropertiesByNode(PropFind $propFind, INode $node) {
+
+        return $this->emit('propFind', [$propFind, $node]);
+
+    }
+
+    /**
+     * This method is invoked by sub-systems creating a new file.
+     *
+     * Currently this is done by HTTP PUT and HTTP LOCK (in the Locks_Plugin).
+     * It was important to get this done through a centralized function,
+     * allowing plugins to intercept this using the beforeCreateFile event.
+     *
+     * This method will return true if the file was actually created
+     *
+     * @param string   $uri
+     * @param resource $data
+     * @param string   $etag
+     * @return bool
+     */
+    function createFile($uri, $data, &$etag = null) {
+
+        list($dir, $name) = URLUtil::splitPath($uri);
+
+        if (!$this->emit('beforeBind', [$uri])) return false;
+
+        $parent = $this->tree->getNodeForPath($dir);
+        if (!$parent instanceof ICollection) {
+            throw new Exception\Conflict('Files can only be created as children of collections');
+        }
+
+        // It is possible for an event handler to modify the content of the
+        // body, before it gets written. If this is the case, $modified
+        // should be set to true.
+        //
+        // If $modified is true, we must not send back an ETag.
+        $modified = false;
+        if (!$this->emit('beforeCreateFile', [$uri, &$data, $parent, &$modified])) return false;
+
+        $etag = $parent->createFile($name, $data);
+
+        if ($modified) $etag = null;
+
+        $this->tree->markDirty($dir . '/' . $name);
+
+        $this->emit('afterBind', [$uri]);
+        $this->emit('afterCreateFile', [$uri, $parent]);
+
+        return true;
+    }
+
+    /**
+     * This method is invoked by sub-systems updating a file.
+     *
+     * This method will return true if the file was actually updated
+     *
+     * @param string   $uri
+     * @param resource $data
+     * @param string   $etag
+     * @return bool
+     */
+    function updateFile($uri, $data, &$etag = null) {
+
+        $node = $this->tree->getNodeForPath($uri);
+
+        // It is possible for an event handler to modify the content of the
+        // body, before it gets written. If this is the case, $modified
+        // should be set to true.
+        //
+        // If $modified is true, we must not send back an ETag.
+        $modified = false;
+        if (!$this->emit('beforeWriteContent', [$uri, $node, &$data, &$modified])) return false;
+
+        $etag = $node->put($data);
+        if ($modified) $etag = null;
+        $this->emit('afterWriteContent', [$uri, $node]);
+
+        return true;
+    }
+
+
+
+    /**
+     * This method is invoked by sub-systems creating a new directory.
+     *
+     * @param string $uri
+     * @return void
+     */
+    function createDirectory($uri) {
+
+        $this->createCollection($uri, new MkCol(['{DAV:}collection'], []));
+
+    }
+
+    /**
+     * Use this method to create a new collection
+     *
+     * @param string $uri The new uri
+     * @param MkCol $mkCol
+     * @return array|null
+     */
+    function createCollection($uri, MkCol $mkCol) {
+
+        list($parentUri, $newName) = URLUtil::splitPath($uri);
+
+        // Making sure the parent exists
+        try {
+            $parent = $this->tree->getNodeForPath($parentUri);
+
+        } catch (Exception\NotFound $e) {
+            throw new Exception\Conflict('Parent node does not exist');
+
+        }
+
+        // Making sure the parent is a collection
+        if (!$parent instanceof ICollection) {
+            throw new Exception\Conflict('Parent node is not a collection');
+        }
+
+        // Making sure the child does not already exist
+        try {
+            $parent->getChild($newName);
+
+            // If we got here.. it means there's already a node on that url, and we need to throw a 405
+            throw new Exception\MethodNotAllowed('The resource you tried to create already exists');
+
+        } catch (Exception\NotFound $e) {
+            // NotFound is the expected behavior.
+        }
+
+
+        if (!$this->emit('beforeBind', [$uri])) return;
+
+        if ($parent instanceof IExtendedCollection) {
+
+            /**
+             * If the parent is an instance of IExtendedCollection, it means that
+             * we can pass the MkCol object directly as it may be able to store
+             * properties immediately.
+             */
+            $parent->createExtendedCollection($newName, $mkCol);
+
+        } else {
+
+            /**
+             * If the parent is a standard ICollection, it means only
+             * 'standard' collections can be created, so we should fail any
+             * MKCOL operation that carries extra resourcetypes.
+             */
+            if (count($mkCol->getResourceType()) > 1) {
+                throw new Exception\InvalidResourceType('The {DAV:}resourcetype you specified is not supported here.');
+            }
+
+            $parent->createDirectory($newName);
+
+        }
+
+        // If there are any properties that have not been handled/stored,
+        // we ask the 'propPatch' event to handle them. This will allow for
+        // example the propertyStorage system to store properties upon MKCOL.
+        if ($mkCol->getRemainingMutations()) {
+            $this->emit('propPatch', [$uri, $mkCol]);
+        }
+        $success = $mkCol->commit();
+
+        if (!$success) {
+            $result = $mkCol->getResult();
+            // generateMkCol needs the href key to exist.
+            $result['href'] = $uri;
+            return $result;
+        }
+
+        $this->tree->markDirty($parentUri);
+        $this->emit('afterBind', [$uri]);
+
+    }
+
+    /**
+     * This method updates a resource's properties
+     *
+     * The properties array must be a list of properties. Array-keys are
+     * property names in clarknotation, array-values are it's values.
+     * If a property must be deleted, the value should be null.
+     *
+     * Note that this request should either completely succeed, or
+     * completely fail.
+     *
+     * The response is an array with properties for keys, and http status codes
+     * as their values.
+     *
+     * @param string $path
+     * @param array $properties
+     * @return array
+     */
+    function updateProperties($path, array $properties) {
+
+        $propPatch = new PropPatch($properties);
+        $this->emit('propPatch', [$path, $propPatch]);
+        $propPatch->commit();
+
+        return $propPatch->getResult();
+
+    }
+
+    /**
+     * This method checks the main HTTP preconditions.
+     *
+     * Currently these are:
+     *   * If-Match
+     *   * If-None-Match
+     *   * If-Modified-Since
+     *   * If-Unmodified-Since
+     *
+     * The method will return true if all preconditions are met
+     * The method will return false, or throw an exception if preconditions
+     * failed. If false is returned the operation should be aborted, and
+     * the appropriate HTTP response headers are already set.
+     *
+     * Normally this method will throw 412 Precondition Failed for failures
+     * related to If-None-Match, If-Match and If-Unmodified Since. It will
+     * set the status to 304 Not Modified for If-Modified_since.
+     *
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
+     * @return bool
+     */
+    function checkPreconditions(RequestInterface $request, ResponseInterface $response) {
+
+        $path = $request->getPath();
+        $node = null;
+        $lastMod = null;
+        $etag = null;
+
+        if ($ifMatch = $request->getHeader('If-Match')) {
+
+            // If-Match contains an entity tag. Only if the entity-tag
+            // matches we are allowed to make the request succeed.
+            // If the entity-tag is '*' we are only allowed to make the
+            // request succeed if a resource exists at that url.
+            try {
+                $node = $this->tree->getNodeForPath($path);
+            } catch (Exception\NotFound $e) {
+                throw new Exception\PreconditionFailed('An If-Match header was specified and the resource did not exist', 'If-Match');
+            }
+
+            // Only need to check entity tags if they are not *
+            if ($ifMatch !== '*') {
+
+                // There can be multiple ETags
+                $ifMatch = explode(',', $ifMatch);
+                $haveMatch = false;
+                foreach ($ifMatch as $ifMatchItem) {
+
+                    // Stripping any extra spaces
+                    $ifMatchItem = trim($ifMatchItem, ' ');
+
+                    $etag = $node instanceof IFile ? $node->getETag() : null;
+                    if ($etag === $ifMatchItem) {
+                        $haveMatch = true;
+                    } else {
+                        // Evolution has a bug where it sometimes prepends the "
+                        // with a \. This is our workaround.
+                        if (str_replace('\\"', '"', $ifMatchItem) === $etag) {
+                            $haveMatch = true;
+                        }
+                    }
+
+                }
+                if (!$haveMatch) {
+                    if ($etag) $response->setHeader('ETag', $etag);
+                     throw new Exception\PreconditionFailed('An If-Match header was specified, but none of the specified the ETags matched.', 'If-Match');
+                }
+            }
+        }
+
+        if ($ifNoneMatch = $request->getHeader('If-None-Match')) {
+
+            // The If-None-Match header contains an ETag.
+            // Only if the ETag does not match the current ETag, the request will succeed
+            // The header can also contain *, in which case the request
+            // will only succeed if the entity does not exist at all.
+            $nodeExists = true;
+            if (!$node) {
+                try {
+                    $node = $this->tree->getNodeForPath($path);
+                } catch (Exception\NotFound $e) {
+                    $nodeExists = false;
+                }
+            }
+            if ($nodeExists) {
+                $haveMatch = false;
+                if ($ifNoneMatch === '*') $haveMatch = true;
+                else {
+
+                    // There might be multiple ETags
+                    $ifNoneMatch = explode(',', $ifNoneMatch);
+                    $etag = $node instanceof IFile ? $node->getETag() : null;
+
+                    foreach ($ifNoneMatch as $ifNoneMatchItem) {
+
+                        // Stripping any extra spaces
+                        $ifNoneMatchItem = trim($ifNoneMatchItem, ' ');
+
+                        if ($etag === $ifNoneMatchItem) $haveMatch = true;
+
+                    }
+
+                }
+
+                if ($haveMatch) {
+                    if ($etag) $response->setHeader('ETag', $etag);
+                    if ($request->getMethod() === 'GET') {
+                        $response->setStatus(304);
+                        return false;
+                    } else {
+                        throw new Exception\PreconditionFailed('An If-None-Match header was specified, but the ETag matched (or * was specified).', 'If-None-Match');
+                    }
+                }
+            }
+
+        }
+
+        if (!$ifNoneMatch && ($ifModifiedSince = $request->getHeader('If-Modified-Since'))) {
+
+            // The If-Modified-Since header contains a date. We
+            // will only return the entity if it has been changed since
+            // that date. If it hasn't been changed, we return a 304
+            // header
+            // Note that this header only has to be checked if there was no If-None-Match header
+            // as per the HTTP spec.
+            $date = HTTP\Util::parseHTTPDate($ifModifiedSince);
+
+            if ($date) {
+                if (is_null($node)) {
+                    $node = $this->tree->getNodeForPath($path);
+                }
+                $lastMod = $node->getLastModified();
+                if ($lastMod) {
+                    $lastMod = new \DateTime('@' . $lastMod);
+                    if ($lastMod <= $date) {
+                        $response->setStatus(304);
+                        $response->setHeader('Last-Modified', HTTP\Util::toHTTPDate($lastMod));
+                        return false;
+                    }
+                }
+            }
+        }
+
+        if ($ifUnmodifiedSince = $request->getHeader('If-Unmodified-Since')) {
+
+            // The If-Unmodified-Since will allow allow the request if the
+            // entity has not changed since the specified date.
+            $date = HTTP\Util::parseHTTPDate($ifUnmodifiedSince);
+
+            // We must only check the date if it's valid
+            if ($date) {
+                if (is_null($node)) {
+                    $node = $this->tree->getNodeForPath($path);
+                }
+                $lastMod = $node->getLastModified();
+                if ($lastMod) {
+                    $lastMod = new \DateTime('@' . $lastMod);
+                    if ($lastMod > $date) {
+                        throw new Exception\PreconditionFailed('An If-Unmodified-Since header was specified, but the entity has been changed since the specified date.', 'If-Unmodified-Since');
+                    }
+                }
+            }
+
+        }
+
+        // Now the hardest, the If: header. The If: header can contain multiple
+        // urls, ETags and so-called 'state tokens'.
+        //
+        // Examples of state tokens include lock-tokens (as defined in rfc4918)
+        // and sync-tokens (as defined in rfc6578).
+        //
+        // The only proper way to deal with these, is to emit events, that a
+        // Sync and Lock plugin can pick up.
+        $ifConditions = $this->getIfConditions($request);
+
+        foreach ($ifConditions as $kk => $ifCondition) {
+            foreach ($ifCondition['tokens'] as $ii => $token) {
+                $ifConditions[$kk]['tokens'][$ii]['validToken'] = false;
+            }
+        }
+
+        // Plugins are responsible for validating all the tokens.
+        // If a plugin deemed a token 'valid', it will set 'validToken' to
+        // true.
+        $this->emit('validateTokens', [ $request, &$ifConditions ]);
+
+        // Now we're going to analyze the result.
+
+        // Every ifCondition needs to validate to true, so we exit as soon as
+        // we have an invalid condition.
+        foreach ($ifConditions as $ifCondition) {
+
+            $uri = $ifCondition['uri'];
+            $tokens = $ifCondition['tokens'];
+
+            // We only need 1 valid token for the condition to succeed.
+            foreach ($tokens as $token) {
+
+                $tokenValid = $token['validToken'] || !$token['token'];
+
+                $etagValid = false;
+                if (!$token['etag']) {
+                    $etagValid = true;
+                }
+                // Checking the ETag, only if the token was already deamed
+                // valid and there is one.
+                if ($token['etag'] && $tokenValid) {
+
+                    // The token was valid, and there was an ETag. We must
+                    // grab the current ETag and check it.
+                    $node = $this->tree->getNodeForPath($uri);
+                    $etagValid = $node instanceof IFile && $node->getETag() == $token['etag'];
+
+                }
+
+
+                if (($tokenValid && $etagValid) ^ $token['negate']) {
+                    // Both were valid, so we can go to the next condition.
+                    continue 2;
+                }
+
+
+            }
+
+            // If we ended here, it means there was no valid ETag + token
+            // combination found for the current condition. This means we fail!
+            throw new Exception\PreconditionFailed('Failed to find a valid token/etag combination for ' . $uri, 'If');
+
+        }
+
+        return true;
+
+    }
+
+    /**
+     * This method is created to extract information from the WebDAV HTTP 'If:' header
+     *
+     * The If header can be quite complex, and has a bunch of features. We're using a regex to extract all relevant information
+     * The function will return an array, containing structs with the following keys
+     *
+     *   * uri   - the uri the condition applies to.
+     *   * tokens - The lock token. another 2 dimensional array containing 3 elements
+     *
+     * Example 1:
+     *
+     * If: (<opaquelocktoken:181d4fae-7d8c-11d0-a765-00a0c91e6bf2>)
+     *
+     * Would result in:
+     *
+     * [
+     *    [
+     *       'uri' => '/request/uri',
+     *       'tokens' => [
+     *          [
+     *              [
+     *                  'negate' => false,
+     *                  'token'  => 'opaquelocktoken:181d4fae-7d8c-11d0-a765-00a0c91e6bf2',
+     *                  'etag'   => ""
+     *              ]
+     *          ]
+     *       ],
+     *    ]
+     * ]
+     *
+     * Example 2:
+     *
+     * If: </path/> (Not <opaquelocktoken:181d4fae-7d8c-11d0-a765-00a0c91e6bf2> ["Im An ETag"]) (["Another ETag"]) </path2/> (Not ["Path2 ETag"])
+     *
+     * Would result in:
+     *
+     * [
+     *    [
+     *       'uri' => 'path',
+     *       'tokens' => [
+     *          [
+     *              [
+     *                  'negate' => true,
+     *                  'token'  => 'opaquelocktoken:181d4fae-7d8c-11d0-a765-00a0c91e6bf2',
+     *                  'etag'   => '"Im An ETag"'
+     *              ],
+     *              [
+     *                  'negate' => false,
+     *                  'token'  => '',
+     *                  'etag'   => '"Another ETag"'
+     *              ]
+     *          ]
+     *       ],
+     *    ],
+     *    [
+     *       'uri' => 'path2',
+     *       'tokens' => [
+     *          [
+     *              [
+     *                  'negate' => true,
+     *                  'token'  => '',
+     *                  'etag'   => '"Path2 ETag"'
+     *              ]
+     *          ]
+     *       ],
+     *    ],
+     * ]
+     *
+     * @param RequestInterface $request
+     * @return array
+     */
+    function getIfConditions(RequestInterface $request) {
+
+        $header = $request->getHeader('If');
+        if (!$header) return [];
+
+        $matches = [];
+
+        $regex = '/(?:\<(?P<uri>.*?)\>\s)?\((?P<not>Not\s)?(?:\<(?P<token>[^\>]*)\>)?(?:\s?)(?:\[(?P<etag>[^\]]*)\])?\)/im';
+        preg_match_all($regex, $header, $matches, PREG_SET_ORDER);
+
+        $conditions = [];
+
+        foreach ($matches as $match) {
+
+            // If there was no uri specified in this match, and there were
+            // already conditions parsed, we add the condition to the list of
+            // conditions for the previous uri.
+            if (!$match['uri'] && count($conditions)) {
+                $conditions[count($conditions) - 1]['tokens'][] = [
+                    'negate' => $match['not'] ? true : false,
+                    'token'  => $match['token'],
+                    'etag'   => isset($match['etag']) ? $match['etag'] : ''
+                ];
+            } else {
+
+                if (!$match['uri']) {
+                    $realUri = $request->getPath();
+                } else {
+                    $realUri = $this->calculateUri($match['uri']);
+                }
+
+                $conditions[] = [
+                    'uri'    => $realUri,
+                    'tokens' => [
+                        [
+                            'negate' => $match['not'] ? true : false,
+                            'token'  => $match['token'],
+                            'etag'   => isset($match['etag']) ? $match['etag'] : ''
+                        ]
+                    ],
+
+                ];
+            }
+
+        }
+
+        return $conditions;
+
+    }
+
+    /**
+     * Returns an array with resourcetypes for a node.
+     *
+     * @param INode $node
+     * @return array
+     */
+    function getResourceTypeForNode(INode $node) {
+
+        $result = [];
+        foreach ($this->resourceTypeMapping as $className => $resourceType) {
+            if ($node instanceof $className) $result[] = $resourceType;
+        }
+        return $result;
+
+    }
+
+    // }}}
+    // {{{ XML Readers & Writers
+
+
+    /**
+     * Generates a WebDAV propfind response body based on a list of nodes.
+     *
+     * If 'strip404s' is set to true, all 404 responses will be removed.
+     *
+     * @param array $fileProperties The list with nodes
+     * @param bool strip404s
+     * @return string
+     */
+    function generateMultiStatus(array $fileProperties, $strip404s = false) {
+
+        $xml = [];
+
+        foreach ($fileProperties as $entry) {
+
+            $href = $entry['href'];
+            unset($entry['href']);
+            if ($strip404s) {
+                unset($entry[404]);
+            }
+            $response = new Xml\Element\Response(
+                ltrim($href, '/'),
+                $entry
+            );
+            $xml[] = [
+                'name'  => '{DAV:}response',
+                'value' => $response
+            ];
+
+        }
+        return $this->xml->write('{DAV:}multistatus', $xml, $this->baseUri);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/ServerPlugin.php b/vendor/sabre/dav/lib/DAV/ServerPlugin.php
index c393f43fb..b2c468ab3 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/ServerPlugin.php
+++ b/vendor/sabre/dav/lib/DAV/ServerPlugin.php
@@ -7,7 +7,7 @@ namespace Sabre\DAV;
  *
  * Plugins can modify or extend the servers behaviour.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -24,7 +24,7 @@ abstract class ServerPlugin {
      * @param Server $server
      * @return void
      */
-    abstract public function initialize(Server $server);
+    abstract function initialize(Server $server);
 
     /**
      * This method should return a list of server-features.
@@ -34,9 +34,9 @@ abstract class ServerPlugin {
      *
      * @return array
      */
-    public function getFeatures() {
+    function getFeatures() {
 
-        return array();
+        return [];
 
     }
 
@@ -47,12 +47,12 @@ abstract class ServerPlugin {
      * This method is passed a uri. It should only return HTTP methods that are
      * available for the specified uri.
      *
-     * @param string $uri
+     * @param string $path
      * @return array
      */
-    public function getHTTPMethods($uri) {
+    function getHTTPMethods($path) {
 
-        return array();
+        return [];
 
     }
 
@@ -64,7 +64,7 @@ abstract class ServerPlugin {
      *
      * @return string
      */
-    public function getPluginName() {
+    function getPluginName() {
 
         return get_class($this);
 
@@ -80,11 +80,31 @@ abstract class ServerPlugin {
      * @param string $uri
      * @return array
      */
-    public function getSupportedReportSet($uri) {
+    function getSupportedReportSet($uri) {
 
-        return array();
+        return [];
 
     }
 
-}
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => null,
+            'link'        => null,
+        ];
 
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/SimpleCollection.php b/vendor/sabre/dav/lib/DAV/SimpleCollection.php
index 1bdb166c7..998cfcbff 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/SimpleCollection.php
+++ b/vendor/sabre/dav/lib/DAV/SimpleCollection.php
@@ -8,7 +8,7 @@ namespace Sabre\DAV;
  * The SimpleCollection is used to quickly setup static directory structures.
  * Just create the object with a proper name, and add children to use it.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -17,9 +17,9 @@ class SimpleCollection extends Collection {
     /**
      * List of childnodes
      *
-     * @var array
+     * @var INode[]
      */
-    protected $children = array();
+    protected $children = [];
 
     /**
      * Name of this resource
@@ -35,12 +35,12 @@ class SimpleCollection extends Collection {
      * This nodes must be instances of INode
      *
      * @param string $name
-     * @param array $children
+     * @param INode[] $children
      */
-    public function __construct($name,array $children = array()) {
+    function __construct($name, array $children = []) {
 
         $this->name = $name;
-        foreach($children as $child) {
+        foreach ($children as $child) {
 
             if (!($child instanceof INode)) throw new Exception('Only instances of Sabre\DAV\INode are allowed to be passed in the children argument');
             $this->addChild($child);
@@ -55,7 +55,7 @@ class SimpleCollection extends Collection {
      * @param INode $child
      * @return void
      */
-    public function addChild(INode $child) {
+    function addChild(INode $child) {
 
         $this->children[$child->getName()] = $child;
 
@@ -66,7 +66,7 @@ class SimpleCollection extends Collection {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return $this->name;
 
@@ -85,7 +85,7 @@ class SimpleCollection extends Collection {
      * @throws Exception\NotFound
      * @return INode
      */
-    public function getChild($name) {
+    function getChild($name) {
 
         if (isset($this->children[$name])) return $this->children[$name];
         throw new Exception\NotFound('File not found: ' . $name . ' in \'' . $this->getName() . '\'');
@@ -95,9 +95,9 @@ class SimpleCollection extends Collection {
     /**
      * Returns a list of children for this collection
      *
-     * @return array
+     * @return INode[]
      */
-    public function getChildren() {
+    function getChildren() {
 
         return array_values($this->children);
 
@@ -105,4 +105,3 @@ class SimpleCollection extends Collection {
 
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/SimpleFile.php b/vendor/sabre/dav/lib/DAV/SimpleFile.php
index b7413fdde..bcad786f3 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/SimpleFile.php
+++ b/vendor/sabre/dav/lib/DAV/SimpleFile.php
@@ -9,7 +9,7 @@ namespace Sabre\DAV;
  * the directory structure. One usecase would be to add a 'readme.txt' to a
  * root of a webserver with some standard content.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -20,7 +20,7 @@ class SimpleFile extends File {
      *
      * @var string
      */
-    protected $contents = array();
+    protected $contents = [];
 
     /**
      * Name of this resource
@@ -46,7 +46,7 @@ class SimpleFile extends File {
      * @param string $contents
      * @param string|null $mimeType
      */
-    public function __construct($name, $contents, $mimeType = null) {
+    function __construct($name, $contents, $mimeType = null) {
 
         $this->name = $name;
         $this->contents = $contents;
@@ -61,7 +61,7 @@ class SimpleFile extends File {
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         return $this->name;
 
@@ -74,7 +74,7 @@ class SimpleFile extends File {
      *
      * @return mixed
      */
-    public function get() {
+    function get() {
 
         return $this->contents;
 
@@ -85,7 +85,7 @@ class SimpleFile extends File {
      *
      * @return int
      */
-    public function getSize() {
+    function getSize() {
 
         return strlen($this->contents);
 
@@ -100,9 +100,9 @@ class SimpleFile extends File {
      * Return null if the ETag can not effectively be determined
      * @return string
      */
-    public function getETag() {
+    function getETag() {
 
-        return '"' . md5($this->contents) . '"';
+        return '"' . sha1($this->contents) . '"';
 
     }
 
@@ -112,7 +112,7 @@ class SimpleFile extends File {
      * If null is returned, we'll assume application/octet-stream
      * @return string
      */
-    public function getContentType() {
+    function getContentType() {
 
         return $this->mimeType;
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/StringUtil.php b/vendor/sabre/dav/lib/DAV/StringUtil.php
index c71575f49..10eecebfd 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/StringUtil.php
+++ b/vendor/sabre/dav/lib/DAV/StringUtil.php
@@ -9,7 +9,7 @@ namespace Sabre\DAV;
  * the CalDAV calendar-query REPORT, and CardDAV addressbook-query REPORT.
  * Because they both need it, it was decided to put it in Sabre\DAV instead.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -24,15 +24,15 @@ class StringUtil {
      * @param string $matchType
      * @return bool
      */
-    static public function textMatch($haystack, $needle, $collation, $matchType = 'contains') {
+    static function textMatch($haystack, $needle, $collation, $matchType = 'contains') {
 
-        switch($collation) {
+        switch ($collation) {
 
             case 'i;ascii-casemap' :
                 // default strtolower takes locale into consideration
                 // we don't want this.
-                $haystack = str_replace(range('a','z'), range('A','Z'), $haystack);
-                $needle = str_replace(range('a','z'), range('A','Z'), $needle);
+                $haystack = str_replace(range('a', 'z'), range('A', 'Z'), $haystack);
+                $needle = str_replace(range('a', 'z'), range('A', 'Z'), $needle);
                 break;
 
             case 'i;octet' :
@@ -49,16 +49,16 @@ class StringUtil {
 
         }
 
-        switch($matchType) {
+        switch ($matchType) {
 
             case 'contains' :
-                return strpos($haystack, $needle)!==false;
+                return strpos($haystack, $needle) !== false;
             case 'equals' :
                 return $haystack === $needle;
             case 'starts-with' :
-                return strpos($haystack, $needle)===0;
+                return strpos($haystack, $needle) === 0;
             case 'ends-with' :
-                return strrpos($haystack, $needle)===strlen($haystack)-strlen($needle);
+                return strrpos($haystack, $needle) === strlen($haystack) - strlen($needle);
             default :
                 throw new Exception\BadRequest('Match-type: ' . $matchType . ' is not supported');
 
@@ -76,9 +76,9 @@ class StringUtil {
      * @param string $input
      * @return string
      */
-    static public function ensureUTF8($input) {
+    static function ensureUTF8($input) {
 
-        $encoding = mb_detect_encoding($input , array('UTF-8','ISO-8859-1'), true);
+        $encoding = mb_detect_encoding($input, ['UTF-8', 'ISO-8859-1'], true);
 
         if ($encoding === 'ISO-8859-1') {
             return utf8_encode($input);
diff --git a/vendor/sabre/dav/lib/DAV/Sync/ISyncCollection.php b/vendor/sabre/dav/lib/DAV/Sync/ISyncCollection.php
new file mode 100644
index 000000000..d3dc28a80
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Sync/ISyncCollection.php
@@ -0,0 +1,88 @@
+<?php
+
+namespace Sabre\DAV\Sync;
+
+use Sabre\DAV;
+
+/**
+ * If a class extends ISyncCollection, it supports WebDAV-sync.
+ *
+ * You are responsible for maintaining a changelist for this collection. This
+ * means that if any child nodes in this collection was created, modified or
+ * deleted in any way, you should maintain an updated changelist.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface ISyncCollection extends DAV\ICollection {
+
+    /**
+     * This method returns the current sync-token for this collection.
+     * This can be any string.
+     *
+     * If null is returned from this function, the plugin assumes there's no
+     * sync information available.
+     *
+     * @return string|null
+     */
+    function getSyncToken();
+
+    /**
+     * The getChanges method returns all the changes that have happened, since
+     * the specified syncToken and the current collection.
+     *
+     * This function should return an array, such as the following:
+     *
+     * [
+     *   'syncToken' => 'The current synctoken',
+     *   'added'   => [
+     *      'new.txt',
+     *   ],
+     *   'modified'   => [
+     *      'modified.txt',
+     *   ],
+     *   'deleted' => array(
+     *      'foo.php.bak',
+     *      'old.txt'
+     *   )
+     * ];
+     *
+     * The syncToken property should reflect the *current* syncToken of the
+     * collection, as reported getSyncToken(). This is needed here too, to
+     * ensure the operation is atomic.
+     *
+     * If the syncToken is specified as null, this is an initial sync, and all
+     * members should be reported.
+     *
+     * The modified property is an array of nodenames that have changed since
+     * the last token.
+     *
+     * The deleted property is an array with nodenames, that have been deleted
+     * from collection.
+     *
+     * The second argument is basically the 'depth' of the report. If it's 1,
+     * you only have to report changes that happened only directly in immediate
+     * descendants. If it's 2, it should also include changes from the nodes
+     * below the child collections. (grandchildren)
+     *
+     * The third (optional) argument allows a client to specify how many
+     * results should be returned at most. If the limit is not specified, it
+     * should be treated as infinite.
+     *
+     * If the limit (infinite or not) is higher than you're willing to return,
+     * you should throw a Sabre\DAV\Exception\TooMuchMatches() exception.
+     *
+     * If the syncToken is expired (due to data cleanup) or unknown, you must
+     * return null.
+     *
+     * The limit is 'suggestive'. You are free to ignore it.
+     *
+     * @param string $syncToken
+     * @param int $syncLevel
+     * @param int $limit
+     * @return array
+     */
+    function getChanges($syncToken, $syncLevel, $limit = null);
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Sync/Plugin.php b/vendor/sabre/dav/lib/DAV/Sync/Plugin.php
new file mode 100644
index 000000000..4a141c72b
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Sync/Plugin.php
@@ -0,0 +1,277 @@
+<?php
+
+namespace Sabre\DAV\Sync;
+
+use Sabre\DAV;
+use Sabre\HTTP\RequestInterface;
+use Sabre\DAV\Xml\Request\SyncCollectionReport;
+
+/**
+ * This plugin all WebDAV-sync capabilities to the Server.
+ *
+ * WebDAV-sync is defined by rfc6578
+ *
+ * The sync capabilities only work with collections that implement
+ * Sabre\DAV\Sync\ISyncCollection.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Plugin extends DAV\ServerPlugin {
+
+    /**
+     * Reference to server object
+     *
+     * @var DAV\Server
+     */
+    protected $server;
+
+    const SYNCTOKEN_PREFIX = 'http://sabre.io/ns/sync/';
+
+    /**
+     * Returns a plugin name.
+     *
+     * Using this name other plugins will be able to access other plugins
+     * using \Sabre\DAV\Server::getPlugin
+     *
+     * @return string
+     */
+    function getPluginName() {
+
+        return 'sync';
+
+    }
+
+    /**
+     * Initializes the plugin.
+     *
+     * This is when the plugin registers it's hooks.
+     *
+     * @param DAV\Server $server
+     * @return void
+     */
+    function initialize(DAV\Server $server) {
+
+        $this->server = $server;
+        $server->xml->elementMap['{DAV:}sync-collection'] = 'Sabre\\DAV\\Xml\\Request\\SyncCollectionReport';
+
+        $self = $this;
+
+        $server->on('report', function($reportName, $dom, $uri) use ($self) {
+
+            if ($reportName === '{DAV:}sync-collection') {
+                $this->server->transactionType = 'report-sync-collection';
+                $self->syncCollection($uri, $dom);
+                return false;
+            }
+
+        });
+
+        $server->on('propFind',       [$this, 'propFind']);
+        $server->on('validateTokens', [$this, 'validateTokens']);
+
+    }
+
+    /**
+     * Returns a list of reports this plugin supports.
+     *
+     * This will be used in the {DAV:}supported-report-set property.
+     * Note that you still need to subscribe to the 'report' event to actually
+     * implement them
+     *
+     * @param string $uri
+     * @return array
+     */
+    function getSupportedReportSet($uri) {
+
+        $node = $this->server->tree->getNodeForPath($uri);
+        if ($node instanceof ISyncCollection && $node->getSyncToken()) {
+            return [
+                '{DAV:}sync-collection',
+            ];
+        }
+
+        return [];
+
+    }
+
+
+    /**
+     * This method handles the {DAV:}sync-collection HTTP REPORT.
+     *
+     * @param string $uri
+     * @param SyncCollectionReport $report
+     * @return void
+     */
+    function syncCollection($uri, SyncCollectionReport $report) {
+
+        // Getting the data
+        $node = $this->server->tree->getNodeForPath($uri);
+        if (!$node instanceof ISyncCollection) {
+            throw new DAV\Exception\ReportNotSupported('The {DAV:}sync-collection REPORT is not supported on this url.');
+        }
+        $token = $node->getSyncToken();
+        if (!$token) {
+            throw new DAV\Exception\ReportNotSupported('No sync information is available at this node');
+        }
+
+        $syncToken = $report->syncToken;
+        if (!is_null($syncToken)) {
+            // Sync-token must start with our prefix
+            if (substr($syncToken, 0, strlen(self::SYNCTOKEN_PREFIX)) !== self::SYNCTOKEN_PREFIX) {
+                throw new DAV\Exception\InvalidSyncToken('Invalid or unknown sync token');
+            }
+
+            $syncToken = substr($syncToken, strlen(self::SYNCTOKEN_PREFIX));
+
+        }
+        $changeInfo = $node->getChanges($syncToken, $report->syncLevel, $report->limit);
+
+        if (is_null($changeInfo)) {
+
+            throw new DAV\Exception\InvalidSyncToken('Invalid or unknown sync token');
+
+        }
+
+        // Encoding the response
+        $this->sendSyncCollectionResponse(
+            $changeInfo['syncToken'],
+            $uri,
+            $changeInfo['added'],
+            $changeInfo['modified'],
+            $changeInfo['deleted'],
+            $report->properties
+        );
+
+    }
+
+    /**
+     * Sends the response to a sync-collection request.
+     *
+     * @param string $syncToken
+     * @param string $collectionUrl
+     * @param array $added
+     * @param array $modified
+     * @param array $deleted
+     * @param array $properties
+     * @return void
+     */
+    protected function sendSyncCollectionResponse($syncToken, $collectionUrl, array $added, array $modified, array $deleted, array $properties) {
+
+
+        $fullPaths = [];
+
+        // Pre-fetching children, if this is possible.
+        foreach (array_merge($added, $modified) as $item) {
+            $fullPath = $collectionUrl . '/' . $item;
+            $fullPaths[] = $fullPath;
+        }
+
+        $responses = [];
+        foreach ($this->server->getPropertiesForMultiplePaths($fullPaths, $properties) as $fullPath => $props) {
+
+            // The 'Property_Response' class is responsible for generating a
+            // single {DAV:}response xml element.
+            $responses[] = new DAV\Xml\Element\Response($fullPath, $props);
+
+        }
+
+
+
+        // Deleted items also show up as 'responses'. They have no properties,
+        // and a single {DAV:}status element set as 'HTTP/1.1 404 Not Found'.
+        foreach ($deleted as $item) {
+
+            $fullPath = $collectionUrl . '/' . $item;
+            $responses[] = new DAV\Xml\Element\Response($fullPath, [], 404);
+
+        }
+        $multiStatus = new DAV\Xml\Response\MultiStatus($responses, self::SYNCTOKEN_PREFIX . $syncToken);
+
+        $this->server->httpResponse->setStatus(207);
+        $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $this->server->httpResponse->setBody(
+            $this->server->xml->write('{DAV:}multistatus', $multiStatus, $this->server->getBaseUri())
+        );
+
+    }
+
+    /**
+     * This method is triggered whenever properties are requested for a node.
+     * We intercept this to see if we must return a {DAV:}sync-token.
+     *
+     * @param DAV\PropFind $propFind
+     * @param DAV\INode $node
+     * @return void
+     */
+    function propFind(DAV\PropFind $propFind, DAV\INode $node) {
+
+        $propFind->handle('{DAV:}sync-token', function() use ($node) {
+            if (!$node instanceof ISyncCollection || !$token = $node->getSyncToken()) {
+                return;
+            }
+            return self::SYNCTOKEN_PREFIX . $token;
+        });
+
+    }
+
+    /**
+     * The validateTokens event is triggered before every request.
+     *
+     * It's a moment where this plugin can check all the supplied lock tokens
+     * in the If: header, and check if they are valid.
+     *
+     * @param RequestInterface $request
+     * @param array $conditions
+     * @return void
+     */
+    function validateTokens(RequestInterface $request, &$conditions) {
+
+        foreach ($conditions as $kk => $condition) {
+
+            foreach ($condition['tokens'] as $ii => $token) {
+
+                // Sync-tokens must always start with our designated prefix.
+                if (substr($token['token'], 0, strlen(self::SYNCTOKEN_PREFIX)) !== self::SYNCTOKEN_PREFIX) {
+                    continue;
+                }
+
+                // Checking if the token is a match.
+                $node = $this->server->tree->getNodeForPath($condition['uri']);
+
+                if (
+                    $node instanceof ISyncCollection &&
+                    $node->getSyncToken() == substr($token['token'], strlen(self::SYNCTOKEN_PREFIX))
+                ) {
+                    $conditions[$kk]['tokens'][$ii]['validToken'] = true;
+                }
+
+            }
+
+        }
+
+    }
+
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
+
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Adds support for WebDAV Collection Sync (rfc6578)',
+            'link'        => 'http://sabre.io/dav/sync/',
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/TemporaryFileFilterPlugin.php b/vendor/sabre/dav/lib/DAV/TemporaryFileFilterPlugin.php
index 37f976b7b..c5b8aa1ca 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/TemporaryFileFilterPlugin.php
+++ b/vendor/sabre/dav/lib/DAV/TemporaryFileFilterPlugin.php
@@ -2,6 +2,10 @@
 
 namespace Sabre\DAV;
 
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Sabre\HTTP\URLUtil;
+
 /**
  * Temporary File Filter Plugin
  *
@@ -22,7 +26,7 @@ namespace Sabre\DAV;
  * Additional patterns can be added, by adding on to the
  * temporaryFilePatterns property.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -34,7 +38,7 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      *
      * @var array
      */
-    public $temporaryFilePatterns = array(
+    public $temporaryFilePatterns = [
         '/^\._(.*)$/',     // OS/X resource forks
         '/^.DS_Store$/',   // OS/X custom folder settings
         '/^desktop.ini$/', // Windows custom folder settings
@@ -42,7 +46,7 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
         '/^.(.*).swp$/',   // ViM temporary files
         '/^\.dat(.*)$/',   // Smultron seems to create these
         '/^~lock.(.*)#$/', // Windows 7 lockfiles
-    );
+    ];
 
     /**
      * A reference to the main Server class
@@ -68,9 +72,9 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      *
      * @param string|null $dataDir
      */
-    public function __construct($dataDir = null) {
+    function __construct($dataDir = null) {
 
-        if (!$dataDir) $dataDir = ini_get('session.save_path').'/sabredav/';
+        if (!$dataDir) $dataDir = ini_get('session.save_path') . '/sabredav/';
         if (!is_dir($dataDir)) mkdir($dataDir);
         $this->dataDir = $dataDir;
 
@@ -85,11 +89,11 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      * @param Server $server
      * @return void
      */
-    public function initialize(Server $server) {
+    function initialize(Server $server) {
 
         $this->server = $server;
-        $server->subscribeEvent('beforeMethod',array($this,'beforeMethod'));
-        $server->subscribeEvent('beforeCreateFile',array($this,'beforeCreateFile'));
+        $server->on('beforeMethod',    [$this, 'beforeMethod']);
+        $server->on('beforeCreateFile', [$this, 'beforeCreateFile']);
 
     }
 
@@ -99,26 +103,26 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      * This method intercepts any GET, DELETE, PUT and PROPFIND calls to
      * filenames that are known to match the 'temporary file' regex.
      *
-     * @param string $method
-     * @param string $uri
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
      * @return bool
      */
-    public function beforeMethod($method, $uri) {
+    function beforeMethod(RequestInterface $request, ResponseInterface $response) {
 
-        if (!$tempLocation = $this->isTempFile($uri))
-            return true;
+        if (!$tempLocation = $this->isTempFile($request->getPath()))
+            return;
 
-        switch($method) {
+        switch ($request->getMethod()) {
             case 'GET' :
-                return $this->httpGet($tempLocation);
+                return $this->httpGet($request, $response, $tempLocation);
             case 'PUT' :
-                return $this->httpPut($tempLocation);
+                return $this->httpPut($request, $response, $tempLocation);
             case 'PROPFIND' :
-                return $this->httpPropfind($tempLocation, $uri);
+                return $this->httpPropfind($request, $response, $tempLocation);
             case 'DELETE' :
-                return $this->httpDelete($tempLocation);
-         }
-         return true;
+                return $this->httpDelete($request, $response, $tempLocation);
+        }
+        return;
 
     }
 
@@ -130,18 +134,21 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      *
      * @param string $uri
      * @param resource $data
+     * @param DAV\ICollection $parentNode
+     * @param bool $modified Should be set to true, if this event handler
+     *                       changed &$data.
      * @return bool
      */
-    public function beforeCreateFile($uri,$data) {
+    function beforeCreateFile($uri, $data, $parent, $modified) {
 
         if ($tempPath = $this->isTempFile($uri)) {
 
             $hR = $this->server->httpResponse;
-            $hR->setHeader('X-Sabre-Temp','true');
-            file_put_contents($tempPath,$data);
+            $hR->setHeader('X-Sabre-Temp', 'true');
+            file_put_contents($tempPath, $data);
             return false;
         }
-        return true;
+        return;
 
     }
 
@@ -151,16 +158,16 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      * temporary file storage.
      *
      * @param string $path
-     * @return boolean|string
+     * @return bool|string
      */
     protected function isTempFile($path) {
 
         // We're only interested in the basename.
         list(, $tempPath) = URLUtil::splitPath($path);
 
-        foreach($this->temporaryFilePatterns as $tempFile) {
+        foreach ($this->temporaryFilePatterns as $tempFile) {
 
-            if (preg_match($tempFile,$tempPath)) {
+            if (preg_match($tempFile, $tempPath)) {
                 return $this->getDataDir() . '/sabredav_' . md5($path) . '.tempfile';
             }
 
@@ -176,19 +183,20 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      * If the file doesn't exist, it will return false which will kick in
      * the regular system for the GET method.
      *
+     * @param RequestInterface $request
+     * @param ResponseInterface $hR
      * @param string $tempLocation
      * @return bool
      */
-    public function httpGet($tempLocation) {
+    function httpGet(RequestInterface $request, ResponseInterface $hR, $tempLocation) {
 
-        if (!file_exists($tempLocation)) return true;
+        if (!file_exists($tempLocation)) return;
 
-        $hR = $this->server->httpResponse;
-        $hR->setHeader('Content-Type','application/octet-stream');
-        $hR->setHeader('Content-Length',filesize($tempLocation));
-        $hR->setHeader('X-Sabre-Temp','true');
-        $hR->sendStatus(200);
-        $hR->sendBody(fopen($tempLocation,'r'));
+        $hR->setHeader('Content-Type', 'application/octet-stream');
+        $hR->setHeader('Content-Length', filesize($tempLocation));
+        $hR->setHeader('X-Sabre-Temp', 'true');
+        $hR->setStatus(200);
+        $hR->setBody(fopen($tempLocation, 'r'));
         return false;
 
     }
@@ -196,13 +204,14 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
     /**
      * This method handles the PUT method.
      *
+     * @param RequestInterface $request
+     * @param ResponseInterface $hR
      * @param string $tempLocation
      * @return bool
      */
-    public function httpPut($tempLocation) {
+    function httpPut(RequestInterface $request, ResponseInterface $hR, $tempLocation) {
 
-        $hR = $this->server->httpResponse;
-        $hR->setHeader('X-Sabre-Temp','true');
+        $hR->setHeader('X-Sabre-Temp', 'true');
 
         $newFile = !file_exists($tempLocation);
 
@@ -210,8 +219,8 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
              throw new Exception\PreconditionFailed('The resource already exists, and an If-None-Match header was supplied');
         }
 
-        file_put_contents($tempLocation,$this->server->httpRequest->getBody());
-        $hR->sendStatus($newFile?201:200);
+        file_put_contents($tempLocation, $this->server->httpRequest->getBody());
+        $hR->setStatus($newFile ? 201 : 200);
         return false;
 
     }
@@ -222,17 +231,18 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      * If the file didn't exist, it will return false, which will make the
      * standard HTTP DELETE handler kick in.
      *
+     * @param RequestInterface $request
+     * @param ResponseInterface $hR
      * @param string $tempLocation
      * @return bool
      */
-    public function httpDelete($tempLocation) {
+    function httpDelete(RequestInterface $request, ResponseInterface $hR, $tempLocation) {
 
-        if (!file_exists($tempLocation)) return true;
+        if (!file_exists($tempLocation)) return;
 
         unlink($tempLocation);
-        $hR = $this->server->httpResponse;
-        $hR->setHeader('X-Sabre-Temp','true');
-        $hR->sendStatus(204);
+        $hR->setHeader('X-Sabre-Temp', 'true');
+        $hR->setStatus(204);
         return false;
 
     }
@@ -244,34 +254,32 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      * for which properties were requested, and just sends back a default
      * set of properties.
      *
+     * @param RequestInterface $request
+     * @param ResponseInterface $hR
      * @param string $tempLocation
-     * @param string $uri
      * @return bool
      */
-    public function httpPropfind($tempLocation, $uri) {
-
-        if (!file_exists($tempLocation)) return true;
+    function httpPropfind(RequestInterface $request, ResponseInterface $hR, $tempLocation) {
 
-        $hR = $this->server->httpResponse;
-        $hR->setHeader('X-Sabre-Temp','true');
-        $hR->sendStatus(207);
-        $hR->setHeader('Content-Type','application/xml; charset=utf-8');
+        if (!file_exists($tempLocation)) return;
 
-        $this->server->parsePropFindRequest($this->server->httpRequest->getBody(true));
+        $hR->setHeader('X-Sabre-Temp', 'true');
+        $hR->setStatus(207);
+        $hR->setHeader('Content-Type', 'application/xml; charset=utf-8');
 
-        $properties = array(
-            'href' => $uri,
-            200 => array(
-                '{DAV:}getlastmodified' => new Property\GetLastModified(filemtime($tempLocation)),
-                '{DAV:}getcontentlength' => filesize($tempLocation),
-                '{DAV:}resourcetype' => new Property\ResourceType(null),
-                '{'.Server::NS_SABREDAV.'}tempFile' => true,
+        $properties = [
+            'href' => $request->getPath(),
+            200    => [
+                '{DAV:}getlastmodified'                 => new Xml\Property\GetLastModified(filemtime($tempLocation)),
+                '{DAV:}getcontentlength'                => filesize($tempLocation),
+                '{DAV:}resourcetype'                    => new Xml\Property\ResourceType(null),
+                '{' . Server::NS_SABREDAV . '}tempFile' => true,
 
-            ),
-         );
+            ],
+        ];
 
-        $data = $this->server->generateMultiStatus(array($properties));
-        $hR->sendBody($data);
+        $data = $this->server->generateMultiStatus([$properties]);
+        $hR->setBody($data);
         return false;
 
     }
diff --git a/vendor/sabre/dav/lib/DAV/Tree.php b/vendor/sabre/dav/lib/DAV/Tree.php
new file mode 100644
index 000000000..4563f7c72
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Tree.php
@@ -0,0 +1,340 @@
+<?php
+
+namespace Sabre\DAV;
+
+use Sabre\HTTP\URLUtil;
+
+/**
+ * The tree object is responsible for basic tree operations.
+ *
+ * It allows for fetching nodes by path, facilitates deleting, copying and
+ * moving.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Tree {
+
+    /**
+     * The root node
+     *
+     * @var ICollection
+     */
+    protected $rootNode;
+
+    /**
+     * This is the node cache. Accessed nodes are stored here.
+     * Arrays keys are path names, values are the actual nodes.
+     *
+     * @var array
+     */
+    protected $cache = [];
+
+    /**
+     * Creates the object
+     *
+     * This method expects the rootObject to be passed as a parameter
+     *
+     * @param ICollection $rootNode
+     */
+    function __construct(ICollection $rootNode) {
+
+        $this->rootNode = $rootNode;
+
+    }
+
+    /**
+     * Returns the INode object for the requested path
+     *
+     * @param string $path
+     * @return INode
+     */
+    function getNodeForPath($path) {
+
+        $path = trim($path, '/');
+        if (isset($this->cache[$path])) return $this->cache[$path];
+
+        // Is it the root node?
+        if (!strlen($path)) {
+            return $this->rootNode;
+        }
+
+        // Attempting to fetch its parent
+        list($parentName, $baseName) = URLUtil::splitPath($path);
+
+        // If there was no parent, we must simply ask it from the root node.
+        if ($parentName === "") {
+            $node = $this->rootNode->getChild($baseName);
+        } else {
+            // Otherwise, we recursively grab the parent and ask him/her.
+            $parent = $this->getNodeForPath($parentName);
+
+            if (!($parent instanceof ICollection))
+                throw new Exception\NotFound('Could not find node at path: ' . $path);
+
+            $node = $parent->getChild($baseName);
+
+        }
+
+        $this->cache[$path] = $node;
+        return $node;
+
+    }
+
+    /**
+     * This function allows you to check if a node exists.
+     *
+     * Implementors of this class should override this method to make
+     * it cheaper.
+     *
+     * @param string $path
+     * @return bool
+     */
+    function nodeExists($path) {
+
+        try {
+
+            // The root always exists
+            if ($path === '') return true;
+
+            list($parent, $base) = URLUtil::splitPath($path);
+
+            $parentNode = $this->getNodeForPath($parent);
+            if (!$parentNode instanceof ICollection) return false;
+            return $parentNode->childExists($base);
+
+        } catch (Exception\NotFound $e) {
+
+            return false;
+
+        }
+
+    }
+
+    /**
+     * Copies a file from path to another
+     *
+     * @param string $sourcePath The source location
+     * @param string $destinationPath The full destination path
+     * @return void
+     */
+    function copy($sourcePath, $destinationPath) {
+
+        $sourceNode = $this->getNodeForPath($sourcePath);
+
+        // grab the dirname and basename components
+        list($destinationDir, $destinationName) = URLUtil::splitPath($destinationPath);
+
+        $destinationParent = $this->getNodeForPath($destinationDir);
+        $this->copyNode($sourceNode, $destinationParent, $destinationName);
+
+        $this->markDirty($destinationDir);
+
+    }
+
+    /**
+     * Moves a file from one location to another
+     *
+     * @param string $sourcePath The path to the file which should be moved
+     * @param string $destinationPath The full destination path, so not just the destination parent node
+     * @return int
+     */
+    function move($sourcePath, $destinationPath) {
+
+        list($sourceDir) = URLUtil::splitPath($sourcePath);
+        list($destinationDir, $destinationName) = URLUtil::splitPath($destinationPath);
+
+        if ($sourceDir === $destinationDir) {
+            // If this is a 'local' rename, it means we can just trigger a rename.
+            $sourceNode = $this->getNodeForPath($sourcePath);
+            $sourceNode->setName($destinationName);
+        } else {
+            $newParentNode = $this->getNodeForPath($destinationDir);
+            $moveSuccess = false;
+            if ($newParentNode instanceof IMoveTarget) {
+                // The target collection may be able to handle the move
+                $sourceNode = $this->getNodeForPath($sourcePath);
+                $moveSuccess = $newParentNode->moveInto($destinationName, $sourcePath, $sourceNode);
+            }
+            if (!$moveSuccess) {
+                $this->copy($sourcePath, $destinationPath);
+                $this->getNodeForPath($sourcePath)->delete();
+            }
+        }
+        $this->markDirty($sourceDir);
+        $this->markDirty($destinationDir);
+
+    }
+
+    /**
+     * Deletes a node from the tree
+     *
+     * @param string $path
+     * @return void
+     */
+    function delete($path) {
+
+        $node = $this->getNodeForPath($path);
+        $node->delete();
+
+        list($parent) = URLUtil::splitPath($path);
+        $this->markDirty($parent);
+
+    }
+
+    /**
+     * Returns a list of childnodes for a given path.
+     *
+     * @param string $path
+     * @return array
+     */
+    function getChildren($path) {
+
+        $node = $this->getNodeForPath($path);
+        $children = $node->getChildren();
+        $basePath = trim($path, '/');
+        if ($basePath !== '') $basePath .= '/';
+
+        foreach ($children as $child) {
+
+            $this->cache[$basePath . $child->getName()] = $child;
+
+        }
+        return $children;
+
+    }
+
+    /**
+     * This method is called with every tree update
+     *
+     * Examples of tree updates are:
+     *   * node deletions
+     *   * node creations
+     *   * copy
+     *   * move
+     *   * renaming nodes
+     *
+     * If Tree classes implement a form of caching, this will allow
+     * them to make sure caches will be expired.
+     *
+     * If a path is passed, it is assumed that the entire subtree is dirty
+     *
+     * @param string $path
+     * @return void
+     */
+    function markDirty($path) {
+
+        // We don't care enough about sub-paths
+        // flushing the entire cache
+        $path = trim($path, '/');
+        foreach ($this->cache as $nodePath => $node) {
+            if ($nodePath == $path || strpos($nodePath, $path . '/') === 0)
+                unset($this->cache[$nodePath]);
+
+        }
+
+    }
+
+    /**
+     * This method tells the tree system to pre-fetch and cache a list of
+     * children of a single parent.
+     *
+     * There are a bunch of operations in the WebDAV stack that request many
+     * children (based on uris), and sometimes fetching many at once can
+     * optimize this.
+     *
+     * This method returns an array with the found nodes. It's keys are the
+     * original paths. The result may be out of order.
+     *
+     * @param array $paths List of nodes that must be fetched.
+     * @return array
+     */
+    function getMultipleNodes($paths) {
+
+        // Finding common parents
+        $parents = [];
+        foreach ($paths as $path) {
+            list($parent, $node) = URLUtil::splitPath($path);
+            if (!isset($parents[$parent])) {
+                $parents[$parent] = [$node];
+            } else {
+                $parents[$parent][] = $node;
+            }
+        }
+
+        $result = [];
+
+        foreach ($parents as $parent => $children) {
+
+            $parentNode = $this->getNodeForPath($parent);
+            if ($parentNode instanceof IMultiGet) {
+                foreach ($parentNode->getMultipleChildren($children) as $childNode) {
+                    $fullPath = $parent . '/' . $childNode->getName();
+                    $result[$fullPath] = $childNode;
+                    $this->cache[$fullPath] = $childNode;
+                }
+            } else {
+                foreach ($children as $child) {
+                    $fullPath = $parent . '/' . $child;
+                    $result[$fullPath] = $this->getNodeForPath($fullPath);
+                }
+            }
+
+        }
+
+        return $result;
+
+    }
+
+
+    /**
+     * copyNode
+     *
+     * @param INode $source
+     * @param ICollection $destinationParent
+     * @param string $destinationName
+     * @return void
+     */
+    protected function copyNode(INode $source, ICollection $destinationParent, $destinationName = null) {
+
+        if (!$destinationName) $destinationName = $source->getName();
+
+        if ($source instanceof IFile) {
+
+            $data = $source->get();
+
+            // If the body was a string, we need to convert it to a stream
+            if (is_string($data)) {
+                $stream = fopen('php://temp', 'r+');
+                fwrite($stream, $data);
+                rewind($stream);
+                $data = $stream;
+            }
+            $destinationParent->createFile($destinationName, $data);
+            $destination = $destinationParent->getChild($destinationName);
+
+        } elseif ($source instanceof ICollection) {
+
+            $destinationParent->createDirectory($destinationName);
+
+            $destination = $destinationParent->getChild($destinationName);
+            foreach ($source->getChildren() as $child) {
+
+                $this->copyNode($child, $destination);
+
+            }
+
+        }
+        if ($source instanceof IProperties && $destination instanceof IProperties) {
+
+            $props = $source->getProperties([]);
+            $propPatch = new PropPatch($props);
+            $destination->propPatch($propPatch);
+            $propPatch->commit();
+
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/UUIDUtil.php b/vendor/sabre/dav/lib/DAV/UUIDUtil.php
index 6a904a7bc..177adafd3 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/UUIDUtil.php
+++ b/vendor/sabre/dav/lib/DAV/UUIDUtil.php
@@ -9,7 +9,7 @@ namespace Sabre\DAV;
  * UUIDs are used a decent amount within various *DAV standards, so it made
  * sense to include it.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -25,24 +25,24 @@ class UUIDUtil {
      */
     static function getUUID() {
 
-        return sprintf( '%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
+        return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
             // 32 bits for "time_low"
-            mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ),
+            mt_rand(0, 0xffff), mt_rand(0, 0xffff),
 
             // 16 bits for "time_mid"
-            mt_rand( 0, 0xffff ),
+            mt_rand(0, 0xffff),
 
             // 16 bits for "time_hi_and_version",
             // four most significant bits holds version number 4
-            mt_rand( 0, 0x0fff ) | 0x4000,
+            mt_rand(0, 0x0fff) | 0x4000,
 
             // 16 bits, 8 bits for "clk_seq_hi_res",
             // 8 bits for "clk_seq_low",
             // two most significant bits holds zero and one for variant DCE1.1
-            mt_rand( 0, 0x3fff ) | 0x8000,
+            mt_rand(0, 0x3fff) | 0x8000,
 
             // 48 bits for "node"
-            mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff ), mt_rand( 0, 0xffff )
+            mt_rand(0, 0xffff), mt_rand(0, 0xffff), mt_rand(0, 0xffff)
         );
     }
 
@@ -57,7 +57,7 @@ class UUIDUtil {
         return preg_match(
             '/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i',
             $uuid
-        ) == true;
+        ) !== 0;
 
     }
 
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Version.php b/vendor/sabre/dav/lib/DAV/Version.php
index afe603c3c..f9331943a 100644
--- a/vendor/sabre/dav/lib/Sabre/DAV/Version.php
+++ b/vendor/sabre/dav/lib/DAV/Version.php
@@ -5,7 +5,7 @@ namespace Sabre\DAV;
 /**
  * This class contains the SabreDAV version constants.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -14,11 +14,6 @@ class Version {
     /**
      * Full version number
      */
-    const VERSION = '1.8.10';
-
-    /**
-     * Stability : alpha, beta, stable
-     */
-    const STABILITY = 'stable';
+    const VERSION = '3.1.3';
 
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Element/Prop.php b/vendor/sabre/dav/lib/DAV/Xml/Element/Prop.php
new file mode 100644
index 000000000..db5332c50
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Element/Prop.php
@@ -0,0 +1,116 @@
+<?php
+
+namespace Sabre\DAV\Xml\Element;
+
+use Sabre\DAV\Xml\Property\Complex;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\Xml\Reader;
+
+/**
+ * This class is responsible for decoding the {DAV:}prop element as it appears
+ * in {DAV:}property-update.
+ *
+ * This class doesn't return an instance of itself. It just returns a
+ * key->value array.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Prop implements XmlDeserializable {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        // If there's no children, we don't do anything.
+        if ($reader->isEmptyElement) {
+            $reader->next();
+            return [];
+        }
+
+        $values = [];
+
+        $reader->read();
+        do {
+
+            if ($reader->nodeType === Reader::ELEMENT) {
+
+                $clark = $reader->getClark();
+                $values[$clark] = self::parseCurrentElement($reader)['value'];
+
+            } else {
+                $reader->read();
+            }
+
+        } while ($reader->nodeType !== Reader::END_ELEMENT);
+
+        $reader->read();
+
+        return $values;
+
+    }
+
+    /**
+     * This function behaves similar to Sabre\Xml\Reader::parseCurrentElement,
+     * but instead of creating deep xml array structures, it will turn any
+     * top-level element it doesn't recognize into either a string, or an
+     * XmlFragment class.
+     *
+     * This method returns arn array with 2 properties:
+     *   * name - A clark-notation XML element name.
+     *   * value - The parsed value.
+     *
+     * @param Reader $reader
+     * @return array
+     */
+    private static function parseCurrentElement(Reader $reader) {
+
+        $name = $reader->getClark();
+
+        if (array_key_exists($name, $reader->elementMap)) {
+            $deserializer = $reader->elementMap[$name];
+            if (is_subclass_of($deserializer, 'Sabre\\Xml\\XmlDeserializable')) {
+                $value = call_user_func([ $deserializer, 'xmlDeserialize' ], $reader);
+            } elseif (is_callable($deserializer)) {
+                $value = call_user_func($deserializer, $reader);
+            } else {
+                $type = gettype($deserializer);
+                if ($type === 'string') {
+                    $type .= ' (' . $deserializer . ')';
+                } elseif ($type === 'object') {
+                    $type .= ' (' . get_class($deserializer) . ')';
+                }
+                throw new \LogicException('Could not use this type as a deserializer: ' . $type);
+            }
+        } else {
+            $value = Complex::xmlDeserialize($reader);
+        }
+
+        return [
+            'name'  => $name,
+            'value' => $value,
+        ];
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Element/Response.php b/vendor/sabre/dav/lib/DAV/Xml/Element/Response.php
new file mode 100644
index 000000000..97a2bb59f
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Element/Response.php
@@ -0,0 +1,253 @@
+<?php
+
+namespace Sabre\DAV\Xml\Element;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+
+/**
+ * WebDAV {DAV:}response parser
+ *
+ * This class parses the {DAV:}response element, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4918#section-14.24
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Response implements Element {
+
+    /**
+     * Url for the response
+     *
+     * @var string
+     */
+    protected $href;
+
+    /**
+     * Propertylist, ordered by HTTP status code
+     *
+     * @var array
+     */
+    protected $responseProperties;
+
+    /**
+     * The HTTP status for an entire response.
+     *
+     * This is currently only used in WebDAV-Sync
+     *
+     * @var string
+     */
+    protected $httpStatus;
+
+    /**
+     * The href argument is a url relative to the root of the server. This
+     * class will calculate the full path.
+     *
+     * The responseProperties argument is a list of properties
+     * within an array with keys representing HTTP status codes
+     *
+     * Besides specific properties, the entire {DAV:}response element may also
+     * have a http status code.
+     * In most cases you don't need it.
+     *
+     * This is currently used by the Sync extension to indicate that a node is
+     * deleted.
+     *
+     * @param string $href
+     * @param array $responseProperties
+     * @param string $httpStatus
+     */
+    function __construct($href, array $responseProperties, $httpStatus = null) {
+
+        $this->href = $href;
+        $this->responseProperties = $responseProperties;
+        $this->httpStatus = $httpStatus;
+
+    }
+
+    /**
+     * Returns the url
+     *
+     * @return string
+     */
+    function getHref() {
+
+        return $this->href;
+
+    }
+
+    /**
+     * Returns the httpStatus value
+     *
+     * @return string
+     */
+    function getHttpStatus() {
+
+        return $this->httpStatus;
+
+    }
+
+    /**
+     * Returns the property list
+     *
+     * @return array
+     */
+    function getResponseProperties() {
+
+        return $this->responseProperties;
+
+    }
+
+
+    /**
+     * The serialize method is called during xml writing.
+     *
+     * It should use the $writer argument to encode this object into XML.
+     *
+     * Important note: it is not needed to create the parent element. The
+     * parent element is already created, and we only have to worry about
+     * attributes, child elements and text (if any).
+     *
+     * Important note 2: If you are writing any new elements, you are also
+     * responsible for closing them.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        if ($status = $this->getHTTPStatus()) {
+            $writer->writeElement('{DAV:}status', 'HTTP/1.1 ' . $status . ' ' . \Sabre\HTTP\Response::$statusCodes[$status]);
+        }
+        $writer->writeElement('{DAV:}href', $writer->contextUri . \Sabre\HTTP\encodePath($this->getHref()));
+
+        $empty = true;
+
+        foreach ($this->getResponseProperties() as $status => $properties) {
+
+            // Skipping empty lists
+            if (!$properties || (!ctype_digit($status) && !is_int($status))) {
+                continue;
+            }
+            $empty = false;
+            $writer->startElement('{DAV:}propstat');
+            $writer->writeElement('{DAV:}prop', $properties);
+            $writer->writeElement('{DAV:}status', 'HTTP/1.1 ' . $status . ' ' . \Sabre\HTTP\Response::$statusCodes[$status]);
+            $writer->endElement(); // {DAV:}propstat
+
+        }
+        if ($empty) {
+            /*
+             * The WebDAV spec _requires_ at least one DAV:propstat to appear for
+             * every DAV:response. In some circumstances however, there are no
+             * properties to encode.
+             *
+             * In those cases we MUST specify at least one DAV:propstat anyway, with
+             * no properties.
+             */
+            $writer->writeElement('{DAV:}propstat', [
+                '{DAV:}prop'   => [],
+                '{DAV:}status' => 'HTTP/1.1 418 ' . \Sabre\HTTP\Response::$statusCodes[418]
+            ]);
+
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $reader->pushContext();
+
+        $reader->elementMap['{DAV:}propstat'] = 'Sabre\\Xml\\Element\\KeyValue';
+
+        // We are overriding the parser for {DAV:}prop. This deserializer is
+        // almost identical to the one for Sabre\Xml\Element\KeyValue.
+        //
+        // The difference is that if there are any child-elements inside of
+        // {DAV:}prop, that have no value, normally any deserializers are
+        // called. But we don't want this, because a singular element without
+        // child-elements implies 'no value' in {DAV:}prop, so we want to skip
+        // deserializers and just set null for those.
+        $reader->elementMap['{DAV:}prop'] = function(Reader $reader) {
+
+            if ($reader->isEmptyElement) {
+                $reader->next();
+                return [];
+            }
+            $values = [];
+            $reader->read();
+            do {
+                if ($reader->nodeType === Reader::ELEMENT) {
+                    $clark = $reader->getClark();
+
+                    if ($reader->isEmptyElement) {
+                        $values[$clark] = null;
+                        $reader->next();
+                    } else {
+                        $values[$clark] = $reader->parseCurrentElement()['value'];
+                    }
+                } else {
+                    $reader->read();
+                }
+            } while ($reader->nodeType !== Reader::END_ELEMENT);
+            $reader->read();
+            return $values;
+
+        };
+        $elems = $reader->parseInnerTree();
+        $reader->popContext();
+
+        $href = null;
+        $propertyLists = [];
+        $statusCode = null;
+
+        foreach ($elems as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{DAV:}href' :
+                    $href = $elem['value'];
+                    break;
+                case '{DAV:}propstat' :
+                    $status = $elem['value']['{DAV:}status'];
+                    list(, $status, ) = explode(' ', $status, 3);
+                    $properties = isset($elem['value']['{DAV:}prop']) ? $elem['value']['{DAV:}prop'] : [];
+                    if ($properties) $propertyLists[$status] = $properties;
+                    break;
+                case '{DAV:}status' :
+                    list(, $statusCode, ) = explode(' ', $elem['value'], 3);
+                    break;
+
+            }
+
+        }
+
+        return new self($href, $propertyLists, $statusCode);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/Complex.php b/vendor/sabre/dav/lib/DAV/Xml/Property/Complex.php
new file mode 100644
index 000000000..1d9202082
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/Complex.php
@@ -0,0 +1,89 @@
+<?php
+
+namespace Sabre\DAV\Xml\Property;
+
+use Sabre\Xml\Element\XmlFragment;
+use Sabre\Xml\Reader;
+
+/**
+ * This class represents a 'complex' property that didn't have a default
+ * decoder.
+ *
+ * It's basically a container for an xml snippet.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Complex extends XmlFragment {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $xml = $reader->readInnerXml();
+
+        if ($reader->nodeType === Reader::ELEMENT && $reader->isEmptyElement) {
+            // Easy!
+            $reader->next();
+            return null;
+        }
+        // Now we have a copy of the inner xml, we need to traverse it to get
+        // all the strings. If there's no non-string data, we just return the
+        // string, otherwise we return an instance of this class.
+        $reader->read();
+
+        $nonText = false;
+        $text = '';
+
+        while (true) {
+
+            switch ($reader->nodeType) {
+                case Reader::ELEMENT :
+                    $nonText = true;
+                    $reader->next();
+                    continue 2;
+                case Reader::TEXT :
+                case Reader::CDATA :
+                    $text .= $reader->value;
+                    break;
+                case Reader::END_ELEMENT :
+                    break 2;
+            }
+            $reader->read();
+
+        }
+
+        // Make sure we advance the cursor one step further.
+        $reader->read();
+
+        if ($nonText) {
+            $new = new self($xml);
+            return $new;
+        } else {
+            return $text;
+        }
+
+    }
+
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/GetLastModified.php b/vendor/sabre/dav/lib/DAV/Xml/Property/GetLastModified.php
new file mode 100644
index 000000000..2db47269f
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/GetLastModified.php
@@ -0,0 +1,110 @@
+<?php
+
+namespace Sabre\DAV\Xml\Property;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+use Sabre\HTTP;
+use DateTime;
+use DateTimeZone;
+
+/**
+ * This property represents the {DAV:}getlastmodified property.
+ *
+ * Defined in:
+ * http://tools.ietf.org/html/rfc4918#section-15.7
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class GetLastModified implements Element {
+
+    /**
+     * time
+     *
+     * @var DateTime
+     */
+    public $time;
+
+    /**
+     * Constructor
+     *
+     * @param int|DateTime $time
+     */
+    function __construct($time) {
+
+        if ($time instanceof DateTime) {
+            $this->time = clone $time;
+        } else {
+            $this->time = new DateTime('@' . $time);
+        }
+
+        // Setting timezone to UTC
+        $this->time->setTimezone(new DateTimeZone('UTC'));
+
+    }
+
+    /**
+     * getTime
+     *
+     * @return DateTime
+     */
+    function getTime() {
+
+        return $this->time;
+
+    }
+
+    /**
+     * The serialize method is called during xml writing.
+     *
+     * It should use the $writer argument to encode this object into XML.
+     *
+     * Important note: it is not needed to create the parent element. The
+     * parent element is already created, and we only have to worry about
+     * attributes, child elements and text (if any).
+     *
+     * Important note 2: If you are writing any new elements, you are also
+     * responsible for closing them.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $writer->write(
+            HTTP\Util::toHTTPDate($this->time)
+        );
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * Important note 2: You are responsible for advancing the reader to the
+     * next element. Not doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        return
+            new self(new DateTime($reader->parseInnerTree()));
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/Href.php b/vendor/sabre/dav/lib/DAV/Xml/Property/Href.php
new file mode 100644
index 000000000..538e98d0f
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/Href.php
@@ -0,0 +1,176 @@
+<?php
+
+namespace Sabre\DAV\Xml\Property;
+
+use Sabre\DAV\Browser\HtmlOutput;
+use Sabre\DAV\Browser\HtmlOutputHelper;
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+
+/**
+ * Href property
+ *
+ * This class represents any WebDAV property that contains a {DAV:}href
+ * element, and there are many.
+ *
+ * It can support either 1 or more hrefs. If while unserializing no valid
+ * {DAV:}href elements were found, this property will unserialize itself as
+ * null.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Href implements Element, HtmlOutput {
+
+    /**
+     * List of uris
+     *
+     * @var array
+     */
+    protected $hrefs;
+
+    /**
+     * Automatically prefix the url with the server base directory
+     *
+     * @var bool
+     */
+    protected $autoPrefix = true;
+
+    /**
+     * Constructor
+     *
+     * You must either pass a string for a single href, or an array of hrefs.
+     *
+     * If auto-prefix is set to false, the hrefs will be treated as absolute
+     * and not relative to the servers base uri.
+     *
+     * @param string|string[] $href
+     * @param bool $autoPrefix
+     */
+    function __construct($hrefs, $autoPrefix = true) {
+
+        if (is_string($hrefs)) {
+            $hrefs = [$hrefs];
+        }
+        $this->hrefs = $hrefs;
+        $this->autoPrefix = $autoPrefix;
+
+
+    }
+
+    /**
+     * Returns the first Href.
+     *
+     * @return string
+     */
+    function getHref() {
+
+        return $this->hrefs[0];
+
+    }
+
+    /**
+     * Returns the hrefs as an array
+     *
+     * @return array
+     */
+    function getHrefs() {
+
+        return $this->hrefs;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->getHrefs() as $href) {
+            if ($this->autoPrefix) {
+                $href = $writer->contextUri . \Sabre\HTTP\encodePath($href);
+            }
+            $writer->writeElement('{DAV:}href', $href);
+        }
+
+    }
+
+    /**
+     * Generate html representation for this value.
+     *
+     * The html output is 100% trusted, and no effort is being made to sanitize
+     * it. It's up to the implementor to sanitize user provided values.
+     *
+     * The output must be in UTF-8.
+     *
+     * The baseUri parameter is a url to the root of the application, and can
+     * be used to construct local links.
+     *
+     * @param HtmlOutputHelper $html
+     * @return string
+     */
+    function toHtml(HtmlOutputHelper $html) {
+
+        $links = [];
+        foreach ($this->getHrefs() as $href) {
+            $links[] = $html->link($href);
+        }
+        return implode('<br />', $links);
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $hrefs = [];
+        foreach ((array)$reader->parseInnerTree() as $elem) {
+            if ($elem['name'] !== '{DAV:}href')
+                continue;
+
+            $hrefs[] = $elem['value'];
+
+        }
+        if ($hrefs) {
+            return new self($hrefs, false);
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/LockDiscovery.php b/vendor/sabre/dav/lib/DAV/Xml/Property/LockDiscovery.php
new file mode 100644
index 000000000..f4b692219
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/LockDiscovery.php
@@ -0,0 +1,106 @@
+<?php
+
+namespace Sabre\DAV\Xml\Property;
+
+use Sabre\DAV;
+use Sabre\DAV\Locks\LockInfo;
+use Sabre\Xml\Element\XmlFragment;
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+
+/**
+ * Represents {DAV:}lockdiscovery property.
+ *
+ * This property is defined here:
+ * http://tools.ietf.org/html/rfc4918#section-15.8
+ *
+ * This property contains all the open locks on a given resource
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class LockDiscovery implements XmlSerializable {
+
+    /**
+     * locks
+     *
+     * @var LockInfo[]
+     */
+    public $locks;
+
+    /**
+     * Hides the {DAV:}lockroot element from the response.
+     *
+     * It was reported that showing the lockroot in the response can break
+     * Office 2000 compatibility.
+     *
+     * @var bool
+     */
+    static $hideLockRoot = false;
+
+    /**
+     * __construct
+     *
+     * @param LockInfo[] $locks
+     */
+    function __construct($locks) {
+
+        $this->locks = $locks;
+
+    }
+
+    /**
+     * The serialize method is called during xml writing.
+     *
+     * It should use the $writer argument to encode this object into XML.
+     *
+     * Important note: it is not needed to create the parent element. The
+     * parent element is already created, and we only have to worry about
+     * attributes, child elements and text (if any).
+     *
+     * Important note 2: If you are writing any new elements, you are also
+     * responsible for closing them.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->locks as $lock) {
+
+            $writer->startElement('{DAV:}activelock');
+
+            $writer->startElement('{DAV:}lockscope');
+            if ($lock->scope === LockInfo::SHARED) {
+                $writer->writeElement('{DAV:}shared');
+            } else {
+                $writer->writeElement('{DAV:}exclusive');
+            }
+
+            $writer->endElement(); // {DAV:}lockscope
+
+            $writer->startElement('{DAV:}locktype');
+            $writer->writeElement('{DAV:}write');
+            $writer->endElement(); // {DAV:}locktype
+
+            if (!self::$hideLockRoot) {
+                $writer->startElement('{DAV:}lockroot');
+                $writer->writeElement('{DAV:}href', $writer->contextUri . $lock->uri);
+                $writer->endElement(); // {DAV:}lockroot
+            }
+            $writer->writeElement('{DAV:}depth', ($lock->depth == DAV\Server::DEPTH_INFINITY ? 'infinity' : $lock->depth));
+            $writer->writeElement('{DAV:}timeout', 'Second-' . $lock->timeout);
+
+            $writer->startElement('{DAV:}locktoken');
+            $writer->writeElement('{DAV:}href', 'opaquelocktoken:' . $lock->token);
+            $writer->endElement(); // {DAV:}locktoken
+
+            $writer->writeElement('{DAV:}owner', new XmlFragment($lock->owner));
+            $writer->endElement(); // {DAV:}activelock
+
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/ResourceType.php b/vendor/sabre/dav/lib/DAV/Xml/Property/ResourceType.php
new file mode 100644
index 000000000..302888321
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/ResourceType.php
@@ -0,0 +1,128 @@
+<?php
+
+namespace Sabre\DAV\Xml\Property;
+
+use Sabre\DAV\Browser\HtmlOutput;
+use Sabre\DAV\Browser\HtmlOutputHelper;
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+
+/**
+ * {DAV:}resourcetype property
+ *
+ * This class represents the {DAV:}resourcetype property, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4918#section-15.9
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class ResourceType extends Element\Elements implements HtmlOutput {
+
+    /**
+     * Constructor
+     *
+     * You can either pass null (for no resourcetype), a string (for a single
+     * resourcetype) or an array (for multiple).
+     *
+     * The resourcetype must be specified in clark-notation
+     *
+     * @param array|string|null $resourceType
+     */
+    function __construct($resourceTypes = null) {
+
+        parent::__construct((array)$resourceTypes);
+
+    }
+
+    /**
+     * Returns the values in clark-notation
+     *
+     * For example array('{DAV:}collection')
+     *
+     * @return array
+     */
+    function getValue() {
+
+        return $this->value;
+
+    }
+
+    /**
+     * Checks if the principal contains a certain value
+     *
+     * @param string $type
+     * @return bool
+     */
+    function is($type) {
+
+        return in_array($type, $this->value);
+
+    }
+
+    /**
+     * Adds a resourcetype value to this property
+     *
+     * @param string $type
+     * @return void
+     */
+    function add($type) {
+
+        $this->value[] = $type;
+        $this->value = array_unique($this->value);
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * Important note 2: You are responsible for advancing the reader to the
+     * next element. Not doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        return
+            new self(parent::xmlDeserialize($reader));
+
+    }
+
+    /**
+     * Generate html representation for this value.
+     *
+     * The html output is 100% trusted, and no effort is being made to sanitize
+     * it. It's up to the implementor to sanitize user provided values.
+     *
+     * The output must be in UTF-8.
+     *
+     * The baseUri parameter is a url to the root of the application, and can
+     * be used to construct local links.
+     *
+     * @param HtmlOutputHelper $html
+     * @return string
+     */
+    function toHtml(HtmlOutputHelper $html) {
+
+        return implode(
+            ', ',
+            array_map([$html, 'xmlName'], $this->getValue())
+        );
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedLock.php b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedLock.php
new file mode 100644
index 000000000..f6d01aa37
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedLock.php
@@ -0,0 +1,54 @@
+<?php
+
+namespace Sabre\DAV\Xml\Property;
+
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+
+/**
+ * This class represents the {DAV:}supportedlock property.
+ *
+ * This property is defined here:
+ * http://tools.ietf.org/html/rfc4918#section-15.10
+ *
+ * This property contains information about what kind of locks
+ * this server supports.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedLock implements XmlSerializable {
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $writer->writeElement('{DAV:}lockentry', [
+            '{DAV:}lockscope' => ['{DAV:}exclusive' => null],
+            '{DAV:}locktype'  => ['{DAV:}write'     => null],
+        ]);
+        $writer->writeElement('{DAV:}lockentry', [
+            '{DAV:}lockscope' => ['{DAV:}shared' => null],
+            '{DAV:}locktype'  => ['{DAV:}write'  => null],
+        ]);
+
+    }
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedMethodSet.php b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedMethodSet.php
new file mode 100644
index 000000000..56b418db6
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedMethodSet.php
@@ -0,0 +1,126 @@
+<?php
+
+namespace Sabre\DAV\Xml\Property;
+
+use Sabre\DAV\Browser\HtmlOutput;
+use Sabre\DAV\Browser\HtmlOutputHelper;
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+
+/**
+ * supported-method-set property.
+ *
+ * This property is defined in RFC3253, but since it's
+ * so common in other webdav-related specs, it is part of the core server.
+ *
+ * This property is defined here:
+ * http://tools.ietf.org/html/rfc3253#section-3.1.3
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedMethodSet implements XmlSerializable, HtmlOutput {
+
+    /**
+     * List of methods
+     *
+     * @var string[]
+     */
+    protected $methods = [];
+
+    /**
+     * Creates the property
+     *
+     * Any reports passed in the constructor
+     * should be valid report-types in clark-notation.
+     *
+     * Either a string or an array of strings must be passed.
+     *
+     * @param string|string[] $methods
+     */
+    function __construct($methods = null) {
+
+        $this->methods = (array)$methods;
+
+    }
+
+    /**
+     * Returns the list of supported http methods.
+     *
+     * @return string[]
+     */
+    function getValue() {
+
+        return $this->methods;
+
+    }
+
+    /**
+     * Returns true or false if the property contains a specific method.
+     *
+     * @param string $methodName
+     * @return bool
+     */
+    function has($methodName) {
+
+        return in_array(
+            $methodName,
+            $this->methods
+        );
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->getValue() as $val) {
+            $writer->startElement('{DAV:}supported-method');
+            $writer->writeAttribute('name', $val);
+            $writer->endElement();
+        }
+
+    }
+
+    /**
+     * Generate html representation for this value.
+     *
+     * The html output is 100% trusted, and no effort is being made to sanitize
+     * it. It's up to the implementor to sanitize user provided values.
+     *
+     * The output must be in UTF-8.
+     *
+     * The baseUri parameter is a url to the root of the application, and can
+     * be used to construct local links.
+     *
+     * @param HtmlOutputHelper $html
+     * @return string
+     */
+    function toHtml(HtmlOutputHelper $html) {
+
+        return implode(
+            ', ',
+            array_map([$html, 'h'], $this->getValue())
+        );
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedReportSet.php b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedReportSet.php
new file mode 100644
index 000000000..ebf27300d
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedReportSet.php
@@ -0,0 +1,154 @@
+<?php
+
+namespace Sabre\DAV\Xml\Property;
+
+use Sabre\DAV;
+use Sabre\DAV\Browser\HtmlOutput;
+use Sabre\DAV\Browser\HtmlOutputHelper;
+use Sabre\Xml\Writer;
+use Sabre\Xml\XmlSerializable;
+
+/**
+ * supported-report-set property.
+ *
+ * This property is defined in RFC3253, but since it's
+ * so common in other webdav-related specs, it is part of the core server.
+ *
+ * This property is defined here:
+ * http://tools.ietf.org/html/rfc3253#section-3.1.5
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedReportSet implements XmlSerializable, HtmlOutput {
+
+    /**
+     * List of reports
+     *
+     * @var array
+     */
+    protected $reports = [];
+
+    /**
+     * Creates the property
+     *
+     * Any reports passed in the constructor
+     * should be valid report-types in clark-notation.
+     *
+     * Either a string or an array of strings must be passed.
+     *
+     * @param string|string[] $reports
+     */
+    function __construct($reports = null) {
+
+        if (!is_null($reports))
+            $this->addReport($reports);
+
+    }
+
+    /**
+     * Adds a report to this property
+     *
+     * The report must be a string in clark-notation.
+     * Multiple reports can be specified as an array.
+     *
+     * @param mixed $report
+     * @return void
+     */
+    function addReport($report) {
+
+        $report = (array)$report;
+
+        foreach ($report as $r) {
+
+            if (!preg_match('/^{([^}]*)}(.*)$/', $r))
+                throw new DAV\Exception('Reportname must be in clark-notation');
+
+            $this->reports[] = $r;
+
+        }
+
+    }
+
+    /**
+     * Returns the list of supported reports
+     *
+     * @return string[]
+     */
+    function getValue() {
+
+        return $this->reports;
+
+    }
+
+    /**
+     * Returns true or false if the property contains a specific report.
+     *
+     * @param string $reportName
+     * @return bool
+     */
+    function has($reportName) {
+
+        return in_array(
+            $reportName,
+            $this->reports
+        );
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->getValue() as $val) {
+            $writer->startElement('{DAV:}supported-report');
+            $writer->startElement('{DAV:}report');
+            $writer->writeElement($val);
+            $writer->endElement();
+            $writer->endElement();
+        }
+
+    }
+
+    /**
+     * Generate html representation for this value.
+     *
+     * The html output is 100% trusted, and no effort is being made to sanitize
+     * it. It's up to the implementor to sanitize user provided values.
+     *
+     * The output must be in UTF-8.
+     *
+     * The baseUri parameter is a url to the root of the application, and can
+     * be used to construct local links.
+     *
+     * @param HtmlOutputHelper $html
+     * @return string
+     */
+    function toHtml(HtmlOutputHelper $html) {
+
+        return implode(
+            ', ',
+            array_map([$html, 'xmlName'], $this->getValue())
+        );
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Request/Lock.php b/vendor/sabre/dav/lib/DAV/Xml/Request/Lock.php
new file mode 100644
index 000000000..76df98d13
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/Lock.php
@@ -0,0 +1,81 @@
+<?php
+
+namespace Sabre\DAV\Xml\Request;
+
+use Sabre\DAV\Locks\LockInfo;
+use Sabre\Xml\Element\KeyValue;
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+
+/**
+ * WebDAV LOCK request parser.
+ *
+ * This class parses the {DAV:}lockinfo request, as defined in:
+ *
+ * http://tools.ietf.org/html/rfc4918#section-9.10
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Lock implements XmlDeserializable {
+
+    /**
+     * Owner of the lock
+     *
+     * @var string
+     */
+    public $owner;
+
+    /**
+     * Scope of the lock.
+     *
+     * Either LockInfo::SHARED or LockInfo::EXCLUSIVE
+     * @var int
+     */
+    public $scope;
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $reader->pushContext();
+        $reader->elementMap['{DAV:}owner'] = 'Sabre\\Xml\\Element\\XmlFragment';
+
+        $values = KeyValue::xmlDeserialize($reader);
+
+        $reader->popContext();
+
+        $new = new self();
+        $new->owner = !empty($values['{DAV:}owner']) ? $values['{DAV:}owner']->getXml() : null;
+        $new->scope = LockInfo::SHARED;
+
+        if (isset($values['{DAV:}lockscope'])) {
+            foreach ($values['{DAV:}lockscope'] as $elem) {
+                if ($elem['name'] === '{DAV:}exclusive') $new->scope = LockInfo::EXCLUSIVE;
+            }
+        }
+        return $new;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Request/MkCol.php b/vendor/sabre/dav/lib/DAV/Xml/Request/MkCol.php
new file mode 100644
index 000000000..5db239061
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/MkCol.php
@@ -0,0 +1,82 @@
+<?php
+
+namespace Sabre\DAV\Xml\Request;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+
+/**
+ * WebDAV Extended MKCOL request parser.
+ *
+ * This class parses the {DAV:}mkol request, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc5689#section-5.1
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class MkCol implements XmlDeserializable {
+
+    /**
+     * The list of properties that will be set.
+     *
+     * @var array
+     */
+    protected $properties = [];
+
+    /**
+     * Returns a key=>value array with properties that are supposed to get set
+     * during creation of the new collection.
+     *
+     * @return array
+     */
+    function getProperties() {
+
+        return $this->properties;
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $self = new self();
+
+        $elementMap = $reader->elementMap;
+        $elementMap['{DAV:}prop']   = 'Sabre\DAV\Xml\Element\Prop';
+        $elementMap['{DAV:}set']    = 'Sabre\Xml\Element\KeyValue';
+        $elementMap['{DAV:}remove'] = 'Sabre\Xml\Element\KeyValue';
+
+        $elems = $reader->parseInnerTree($elementMap);
+
+        foreach ($elems as $elem) {
+            if ($elem['name'] === '{DAV:}set') {
+                $self->properties = array_merge($self->properties, $elem['value']['{DAV:}prop']);
+            }
+        }
+
+        return $self;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Request/PropFind.php b/vendor/sabre/dav/lib/DAV/Xml/Request/PropFind.php
new file mode 100644
index 000000000..ad3ad7c43
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/PropFind.php
@@ -0,0 +1,83 @@
+<?php
+
+namespace Sabre\DAV\Xml\Request;
+
+use Sabre\Xml\Element\KeyValue;
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+
+/**
+ * WebDAV PROPFIND request parser.
+ *
+ * This class parses the {DAV:}propfind request, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4918#section-14.20
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PropFind implements XmlDeserializable {
+
+    /**
+     * If this is set to true, this was an 'allprop' request.
+     *
+     * @var bool
+     */
+    public $allProp = false;
+
+    /**
+     * The property list
+     *
+     * @var null|array
+     */
+    public $properties;
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $self = new self();
+
+        $reader->pushContext();
+        $reader->elementMap['{DAV:}prop'] = 'Sabre\Xml\Element\Elements';
+
+        foreach (KeyValue::xmlDeserialize($reader) as $k => $v) {
+
+            switch ($k) {
+                case '{DAV:}prop' :
+                    $self->properties = $v;
+                    break;
+                case '{DAV:}allprop' :
+                    $self->allProp = true;
+
+            }
+
+        }
+
+        $reader->popContext();
+
+        return $self;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Request/PropPatch.php b/vendor/sabre/dav/lib/DAV/Xml/Request/PropPatch.php
new file mode 100644
index 000000000..07a05f887
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/PropPatch.php
@@ -0,0 +1,118 @@
+<?php
+
+namespace Sabre\DAV\Xml\Request;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+
+/**
+ * WebDAV PROPPATCH request parser.
+ *
+ * This class parses the {DAV:}propertyupdate request, as defined in:
+ *
+ * https://tools.ietf.org/html/rfc4918#section-14.20
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PropPatch implements Element {
+
+    /**
+     * The list of properties that will be updated and removed.
+     *
+     * If a property will be removed, it's value will be set to null.
+     *
+     * @var array
+     */
+    public $properties = [];
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->properties as $propertyName => $propertyValue) {
+
+            if (is_null($propertyValue)) {
+                $writer->startElement("{DAV:}remove");
+                $writer->write(['{DAV:}prop' => [$propertyName => $propertyValue]]);
+                $writer->endElement();
+            } else {
+                $writer->startElement("{DAV:}set");
+                $writer->write(['{DAV:}prop' => [$propertyName => $propertyValue]]);
+                $writer->endElement();
+            }
+
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $self = new self();
+
+        $elementMap = $reader->elementMap;
+        $elementMap['{DAV:}prop']   = 'Sabre\DAV\Xml\Element\Prop';
+        $elementMap['{DAV:}set']    = 'Sabre\Xml\Element\KeyValue';
+        $elementMap['{DAV:}remove'] = 'Sabre\Xml\Element\KeyValue';
+
+        $elems = $reader->parseInnerTree($elementMap);
+
+        foreach ($elems as $elem) {
+            if ($elem['name'] === '{DAV:}set') {
+                $self->properties = array_merge($self->properties, $elem['value']['{DAV:}prop']);
+            }
+            if ($elem['name'] === '{DAV:}remove') {
+
+                // Ensuring there are no values.
+                foreach ($elem['value']['{DAV:}prop'] as $remove => $value) {
+                    $self->properties[$remove] = null;
+                }
+
+            }
+        }
+
+        return $self;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Request/SyncCollectionReport.php b/vendor/sabre/dav/lib/DAV/Xml/Request/SyncCollectionReport.php
new file mode 100644
index 000000000..3092ada47
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/SyncCollectionReport.php
@@ -0,0 +1,122 @@
+<?php
+
+namespace Sabre\DAV\Xml\Request;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\Xml\Element\KeyValue;
+use Sabre\DAV\Exception\BadRequest;
+
+/**
+ * SyncCollection request parser.
+ *
+ * This class parses the {DAV:}sync-collection reprot, as defined in:
+ *
+ * http://tools.ietf.org/html/rfc6578#section-3.2
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SyncCollectionReport implements XmlDeserializable {
+
+    /**
+     * The sync-token the client supplied for the report.
+     *
+     * @var string|null
+     */
+    public $syncToken;
+
+    /**
+     * The 'depth' of the sync the client is interested in.
+     *
+     * @var int
+     */
+    public $syncLevel;
+
+    /**
+     * Maximum amount of items returned.
+     *
+     * @var int|null
+     */
+    public $limit;
+
+    /**
+     * The list of properties that are being requested for every change.
+     *
+     * @var null|array
+     */
+    public $properties;
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $self = new self();
+
+        $reader->pushContext();
+
+        $reader->elementMap['{DAV:}prop']   = 'Sabre\Xml\Element\Elements';
+        $elems = KeyValue::xmlDeserialize($reader);
+
+        $reader->popContext();
+
+        $required = [
+            '{DAV:}sync-token',
+            '{DAV:}prop',
+            ];
+
+        foreach ($required as $elem) {
+            if (!array_key_exists($elem, $elems)) {
+                throw new BadRequest('The ' . $elem . ' element in the {DAV:}sync-collection report is required');
+            }
+        }
+
+
+        $self->properties = $elems['{DAV:}prop'];
+        $self->syncToken = $elems['{DAV:}sync-token'];
+
+        if (isset($elems['{DAV:}limit'])) {
+            $nresults = null;
+            foreach ($elems['{DAV:}limit'] as $child) {
+                if ($child['name'] === '{DAV:}nresults') {
+                    $nresults = (int)$child['value'];
+                }
+            }
+            $self->limit = $nresults;
+        }
+
+        if (isset($elems['{DAV:}sync-level'])) {
+
+            $value = $elems['{DAV:}sync-level'];
+            if ($value === 'infinity') {
+                $value = \Sabre\DAV\Server::DEPTH_INFINITY;
+            }
+            $self->syncLevel = $value;
+
+        }
+
+        return $self;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Response/MultiStatus.php b/vendor/sabre/dav/lib/DAV/Xml/Response/MultiStatus.php
new file mode 100644
index 000000000..16a3d4a68
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Response/MultiStatus.php
@@ -0,0 +1,142 @@
+<?php
+
+namespace Sabre\DAV\Xml\Response;
+
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+
+/**
+ * WebDAV MultiStatus parser
+ *
+ * This class parses the {DAV:}multistatus response, as defined in:
+ * https://tools.ietf.org/html/rfc4918#section-14.16
+ *
+ * And it also adds the {DAV:}synctoken change from:
+ * http://tools.ietf.org/html/rfc6578#section-6.4
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class MultiStatus implements Element {
+
+    /**
+     * The responses
+     *
+     * @var \Sabre\DAV\Xml\Element\Response[]
+     */
+    protected $responses;
+
+    /**
+     * A sync token (from RFC6578).
+     *
+     * @var string
+     */
+    protected $syncToken;
+
+    /**
+     * Constructor
+     *
+     * @param \Sabre\DAV\Xml\Element\Response[] $responses
+     * @param string $syncToken
+     */
+    function __construct(array $responses, $syncToken = null) {
+
+        $this->responses = $responses;
+        $this->syncToken = $syncToken;
+
+    }
+
+    /**
+     * Returns the response list.
+     *
+     * @return \Sabre\DAV\Xml\Element\Response[]
+     */
+    function getResponses() {
+
+        return $this->responses;
+
+    }
+
+    /**
+     * Returns the sync-token, if available.
+     *
+     * @return string|null
+     */
+    function getSyncToken() {
+
+        return $this->syncToken;
+
+    }
+
+    /**
+     * The serialize method is called during xml writing.
+     *
+     * It should use the $writer argument to encode this object into XML.
+     *
+     * Important note: it is not needed to create the parent element. The
+     * parent element is already created, and we only have to worry about
+     * attributes, child elements and text (if any).
+     *
+     * Important note 2: If you are writing any new elements, you are also
+     * responsible for closing them.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->getResponses() as $response) {
+            $writer->writeElement('{DAV:}response', $response);
+        }
+        if ($syncToken = $this->getSyncToken()) {
+            $writer->writeElement('{DAV:}sync-token', $syncToken);
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elementMap = $reader->elementMap;
+        $elementMap['{DAV:}prop'] = 'Sabre\\DAV\\Xml\\Element\\Prop';
+        $elements = $reader->parseInnerTree($elementMap);
+
+        $responses = [];
+        $syncToken = null;
+
+        if ($elements) foreach ($elements as $elem) {
+            if ($elem['name'] === '{DAV:}response') {
+                $responses[] = $elem['value'];
+            }
+            if ($elem['name'] === '{DAV:}sync-token') {
+                $syncToken = $elem['value'];
+            }
+        }
+
+        return new self($responses, $syncToken);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Service.php b/vendor/sabre/dav/lib/DAV/Xml/Service.php
new file mode 100644
index 000000000..f41ed984a
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Xml/Service.php
@@ -0,0 +1,47 @@
+<?php
+
+namespace Sabre\DAV\Xml;
+
+/**
+ * XML service for WebDAV
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Service extends \Sabre\Xml\Service {
+
+    /**
+     * This is a list of XML elements that we automatically map to PHP classes.
+     *
+     * For instance, this list may contain an entry `{DAV:}propfind` that would
+     * be mapped to Sabre\DAV\Xml\Request\PropFind
+     */
+    public $elementMap = [
+        '{DAV:}multistatus' => 'Sabre\\DAV\\Xml\\Response\\MultiStatus',
+        '{DAV:}response'    => 'Sabre\\DAV\\Xml\\Element\\Response',
+
+        // Requests
+        '{DAV:}propfind'       => 'Sabre\\DAV\\Xml\\Request\\PropFind',
+        '{DAV:}propertyupdate' => 'Sabre\\DAV\\Xml\\Request\\PropPatch',
+        '{DAV:}mkcol'          => 'Sabre\\DAV\\Xml\\Request\\MkCol',
+
+        // Properties
+        '{DAV:}resourcetype' => 'Sabre\\DAV\\Xml\\Property\\ResourceType',
+
+    ];
+
+    /**
+     * This is a default list of namespaces.
+     *
+     * If you are defining your own custom namespace, add it here to reduce
+     * bandwidth and improve legibility of xml bodies.
+     *
+     * @var array
+     */
+    public $namespaceMap = [
+        'DAV:'                   => 'd',
+        'http://sabredav.org/ns' => 's',
+    ];
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/AbstractPrincipalCollection.php b/vendor/sabre/dav/lib/DAVACL/AbstractPrincipalCollection.php
index a116236f3..460f78981 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/AbstractPrincipalCollection.php
+++ b/vendor/sabre/dav/lib/DAVACL/AbstractPrincipalCollection.php
@@ -1,7 +1,9 @@
 <?php
 
 namespace Sabre\DAVACL;
+
 use Sabre\DAV;
+use Sabre\HTTP\URLUtil;
 
 /**
  * Principals Collection
@@ -11,25 +13,25 @@ use Sabre\DAV;
  *
  * To use this class, simply implement the getChildForPrincipal method.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
 abstract class AbstractPrincipalCollection extends DAV\Collection implements IPrincipalCollection {
 
     /**
-     * Node or 'directory' name.
+     * Principal backend
      *
-     * @var string
+     * @var PrincipalBackend\BackendInterface
      */
-    protected $path;
+    protected $principalBackend;
 
     /**
-     * Principal backend
+     * The path to the principals we're listing from.
      *
-     * @var PrincipalBackend\BackendInterface
+     * @var string
      */
-    protected $principalBackend;
+    protected $principalPrefix;
 
     /**
      * If this value is set to true, it effectively disables listing of users
@@ -51,7 +53,7 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
      * @param PrincipalBackend\BackendInterface $principalBackend
      * @param string $principalPrefix
      */
-    public function __construct(PrincipalBackend\BackendInterface $principalBackend, $principalPrefix = 'principals') {
+    function __construct(PrincipalBackend\BackendInterface $principalBackend, $principalPrefix = 'principals') {
 
         $this->principalPrefix = $principalPrefix;
         $this->principalBackend = $principalBackend;
@@ -75,9 +77,9 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
-        list(,$name) = DAV\URLUtil::splitPath($this->principalPrefix);
+        list(, $name) = URLUtil::splitPath($this->principalPrefix);
         return $name;
 
     }
@@ -87,13 +89,13 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
      *
      * @return array
      */
-    public function getChildren() {
+    function getChildren() {
 
         if ($this->disableListing)
             throw new DAV\Exception\MethodNotAllowed('Listing members of this collection is disabled');
 
-        $children = array();
-        foreach($this->principalBackend->getPrincipalsByPrefix($this->principalPrefix) as $principalInfo) {
+        $children = [];
+        foreach ($this->principalBackend->getPrincipalsByPrefix($this->principalPrefix) as $principalInfo) {
 
             $children[] = $this->getChildForPrincipal($principalInfo);
 
@@ -110,7 +112,7 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
      * @throws DAV\Exception\NotFound
      * @return IPrincipal
      */
-    public function getChild($name) {
+    function getChild($name) {
 
         $principalInfo = $this->principalBackend->getPrincipalByPath($this->principalPrefix . '/' . $name);
         if (!$principalInfo) throw new DAV\Exception\NotFound('Principal with name ' . $name . ' not found');
@@ -130,26 +132,50 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
      * keys in searchProperties are the WebDAV property names, while the values
      * are the property values to search on.
      *
-     * If multiple properties are being searched on, the search should be
-     * AND'ed.
+     * By default, if multiple properties are submitted to this method, the
+     * various properties should be combined with 'AND'. If $test is set to
+     * 'anyof', it should be combined using 'OR'.
      *
      * This method should simply return a list of 'child names', which may be
      * used to call $this->getChild in the future.
      *
      * @param array $searchProperties
+     * @param string $test
      * @return array
      */
-    public function searchPrincipals(array $searchProperties) {
+    function searchPrincipals(array $searchProperties, $test = 'allof') {
 
-        $result = $this->principalBackend->searchPrincipals($this->principalPrefix, $searchProperties);
-        $r = array();
+        $result = $this->principalBackend->searchPrincipals($this->principalPrefix, $searchProperties, $test);
+        $r = [];
 
-        foreach($result as $row) {
-            list(, $r[]) = DAV\URLUtil::splitPath($row);
+        foreach ($result as $row) {
+            list(, $r[]) = URLUtil::splitPath($row);
         }
 
         return $r;
 
     }
 
+    /**
+     * Finds a principal by its URI.
+     *
+     * This method may receive any type of uri, but mailto: addresses will be
+     * the most common.
+     *
+     * Implementation of this API is optional. It is currently used by the
+     * CalDAV system to find principals based on their email addresses. If this
+     * API is not implemented, some features may not work correctly.
+     *
+     * This method must return a relative principal path, or null, if the
+     * principal was not found or you refuse to find it.
+     *
+     * @param string $uri
+     * @return string
+     */
+    function findByUri($uri) {
+
+        return $this->principalBackend->findByUri($uri, $this->principalPrefix);
+
+    }
+
 }
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/AceConflict.php b/vendor/sabre/dav/lib/DAVACL/Exception/AceConflict.php
index 6ee9afd73..22450b4a6 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/AceConflict.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/AceConflict.php
@@ -8,7 +8,7 @@ use Sabre\DAV;
  * This exception is thrown when a client attempts to set conflicting
  * permissions.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -23,11 +23,11 @@ class AceConflict extends DAV\Exception\Conflict {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
         $doc = $errorNode->ownerDocument;
 
-        $np = $doc->createElementNS('DAV:','d:no-ace-conflict');
+        $np = $doc->createElementNS('DAV:', 'd:no-ace-conflict');
         $errorNode->appendChild($np);
 
     }
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/NeedPrivileges.php b/vendor/sabre/dav/lib/DAVACL/Exception/NeedPrivileges.php
index f7e435883..5624fd22f 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/NeedPrivileges.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/NeedPrivileges.php
@@ -10,7 +10,7 @@ use Sabre\DAV;
  * The 403-need privileges is thrown when a user didn't have the appropriate
  * permissions to perform an operation
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -36,7 +36,7 @@ class NeedPrivileges extends DAV\Exception\Forbidden {
      * @param string $uri
      * @param array $privileges
      */
-    public function __construct($uri,array $privileges) {
+    function __construct($uri, array $privileges) {
 
         $this->uri = $uri;
         $this->privileges = $privileges;
@@ -54,25 +54,25 @@ class NeedPrivileges extends DAV\Exception\Forbidden {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
         $doc = $errorNode->ownerDocument;
 
-        $np = $doc->createElementNS('DAV:','d:need-privileges');
+        $np = $doc->createElementNS('DAV:', 'd:need-privileges');
         $errorNode->appendChild($np);
 
-        foreach($this->privileges as $privilege) {
+        foreach ($this->privileges as $privilege) {
 
-            $resource = $doc->createElementNS('DAV:','d:resource');
+            $resource = $doc->createElementNS('DAV:', 'd:resource');
             $np->appendChild($resource);
 
-            $resource->appendChild($doc->createElementNS('DAV:','d:href',$server->getBaseUri() . $this->uri));
+            $resource->appendChild($doc->createElementNS('DAV:', 'd:href', $server->getBaseUri() . $this->uri));
 
-            $priv = $doc->createElementNS('DAV:','d:privilege');
+            $priv = $doc->createElementNS('DAV:', 'd:privilege');
             $resource->appendChild($priv);
 
-            preg_match('/^{([^}]*)}(.*)$/',$privilege,$privilegeParts);
-            $priv->appendChild($doc->createElementNS($privilegeParts[1],'d:' . $privilegeParts[2]));
+            preg_match('/^{([^}]*)}(.*)$/', $privilege, $privilegeParts);
+            $priv->appendChild($doc->createElementNS($privilegeParts[1], 'd:' . $privilegeParts[2]));
 
 
         }
@@ -80,4 +80,3 @@ class NeedPrivileges extends DAV\Exception\Forbidden {
     }
 
 }
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/NoAbstract.php b/vendor/sabre/dav/lib/DAVACL/Exception/NoAbstract.php
index ba6f76cdb..a2363b174 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/NoAbstract.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/NoAbstract.php
@@ -8,7 +8,7 @@ use Sabre\DAV;
  * This exception is thrown when a user tries to set a privilege that's marked
  * as abstract.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -23,11 +23,11 @@ class NoAbstract extends DAV\Exception\PreconditionFailed {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
         $doc = $errorNode->ownerDocument;
 
-        $np = $doc->createElementNS('DAV:','d:no-abstract');
+        $np = $doc->createElementNS('DAV:', 'd:no-abstract');
         $errorNode->appendChild($np);
 
     }
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/NotRecognizedPrincipal.php b/vendor/sabre/dav/lib/DAVACL/Exception/NotRecognizedPrincipal.php
index f61edef07..4349bf101 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/NotRecognizedPrincipal.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/NotRecognizedPrincipal.php
@@ -8,7 +8,7 @@ use Sabre\DAV;
  * If a client tried to set a privilege assigned to a non-existant principal,
  * this exception will be thrown.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -23,11 +23,11 @@ class NotRecognizedPrincipal extends DAV\Exception\PreconditionFailed {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
         $doc = $errorNode->ownerDocument;
 
-        $np = $doc->createElementNS('DAV:','d:recognized-principal');
+        $np = $doc->createElementNS('DAV:', 'd:recognized-principal');
         $errorNode->appendChild($np);
 
     }
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/NotSupportedPrivilege.php b/vendor/sabre/dav/lib/DAVACL/Exception/NotSupportedPrivilege.php
index 6d30698cd..73b81190d 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Exception/NotSupportedPrivilege.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/NotSupportedPrivilege.php
@@ -8,7 +8,7 @@ use Sabre\DAV;
  * If a client tried to set a privilege that doesn't exist, this exception will
  * be thrown.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -23,11 +23,11 @@ class NotSupportedPrivilege extends DAV\Exception\PreconditionFailed {
      * @param \DOMElement $errorNode
      * @return void
      */
-    public function serialize(DAV\Server $server,\DOMElement $errorNode) {
+    function serialize(DAV\Server $server, \DOMElement $errorNode) {
 
         $doc = $errorNode->ownerDocument;
 
-        $np = $doc->createElementNS('DAV:','d:not-supported-privilege');
+        $np = $doc->createElementNS('DAV:', 'd:not-supported-privilege');
         $errorNode->appendChild($np);
 
     }
diff --git a/vendor/sabre/dav/lib/DAVACL/FS/Collection.php b/vendor/sabre/dav/lib/DAVACL/FS/Collection.php
new file mode 100644
index 000000000..5fab4768c
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/FS/Collection.php
@@ -0,0 +1,153 @@
+<?php
+
+namespace Sabre\DAVACL\FS;
+
+use Sabre\DAV\FSExt\Directory as BaseCollection;
+use Sabre\DAVACL\IACL;
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\Exception\NotFound;
+
+/**
+ * This is an ACL-enabled collection.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Collection extends BaseCollection implements IACL {
+
+    /**
+     * A list of ACL rules.
+     *
+     * @var array
+     */
+    protected $acl;
+
+    /**
+     * Owner uri, or null for no owner.
+     *
+     * @var string|null
+     */
+    protected $owner;
+
+    /**
+     * Constructor
+     *
+     * @param string $path on-disk path.
+     * @param array $acl ACL rules.
+     * @param string|null $owner principal owner string.
+     */
+    function __construct($path, array $acl, $owner = null) {
+
+        parent::__construct($path);
+        $this->acl = $acl;
+        $this->owner = $owner;
+
+    }
+
+    /**
+     * Returns a specific child node, referenced by its name
+     *
+     * This method must throw Sabre\DAV\Exception\NotFound if the node does not
+     * exist.
+     *
+     * @param string $name
+     * @throws DAV\Exception\NotFound
+     * @return DAV\INode
+     */
+    function getChild($name) {
+
+        $path = $this->path . '/' . $name;
+
+        if (!file_exists($path)) throw new NotFound('File could not be located');
+        if ($name == '.' || $name == '..') throw new Forbidden('Permission denied to . and ..');
+
+        if (is_dir($path)) {
+
+            return new self($path, $this->acl, $this->owner);
+
+        } else {
+
+            return new File($path, $this->acl, $this->owner);
+
+        }
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getOwner() {
+
+        return $this->owner;
+
+    }
+
+    /**
+     * Returns a group principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getGroup() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    function getACL() {
+
+        return $this->acl;
+
+    }
+
+    /**
+     * Updates the ACL
+     *
+     * This method will receive a list of new ACE's as an array argument.
+     *
+     * @param array $acl
+     * @return void
+     */
+    function setACL(array $acl) {
+
+        throw new Forbidden('Setting ACL is not allowed here');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    function getSupportedPrivilegeSet() {
+
+        return null;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/FS/File.php b/vendor/sabre/dav/lib/DAVACL/FS/File.php
new file mode 100644
index 000000000..0d549528b
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/FS/File.php
@@ -0,0 +1,123 @@
+<?php
+
+namespace Sabre\DAVACL\FS;
+
+use Sabre\DAV\FSExt\File as BaseFile;
+use Sabre\DAVACL\IACL;
+use Sabre\DAV\Exception\Forbidden;
+
+/**
+ * This is an ACL-enabled file node.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class File extends BaseFile implements IACL {
+
+    /**
+     * A list of ACL rules.
+     *
+     * @var array
+     */
+    protected $acl;
+
+    /**
+     * Owner uri, or null for no owner.
+     *
+     * @var string|null
+     */
+    protected $owner;
+
+    /**
+     * Constructor
+     *
+     * @param string $path on-disk path.
+     * @param array $acl ACL rules.
+     * @param string|null $owner principal owner string.
+     */
+    function __construct($path, array $acl, $owner = null) {
+
+        parent::__construct($path);
+        $this->acl = $acl;
+        $this->owner = $owner;
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getOwner() {
+
+        return $this->owner;
+
+    }
+
+    /**
+     * Returns a group principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getGroup() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    function getACL() {
+
+        return $this->acl;
+
+    }
+
+    /**
+     * Updates the ACL
+     *
+     * This method will receive a list of new ACE's as an array argument.
+     *
+     * @param array $acl
+     * @return void
+     */
+    function setACL(array $acl) {
+
+        throw new Forbidden('Setting ACL is not allowed here');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    function getSupportedPrivilegeSet() {
+
+        return null;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/FS/HomeCollection.php b/vendor/sabre/dav/lib/DAVACL/FS/HomeCollection.php
new file mode 100644
index 000000000..c27616770
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/FS/HomeCollection.php
@@ -0,0 +1,188 @@
+<?php
+
+namespace Sabre\DAVACL\FS;
+
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAVACL\AbstractPrincipalCollection;
+use Sabre\DAVACL\IACL;
+use Sabre\DAVACL\PrincipalBackend\BackendInterface;
+use Sabre\Uri;
+
+/**
+ * This collection contains a collection for every principal.
+ * It is similar to /home on many unix systems.
+ *
+ * The per-user collections can only be accessed by the user who owns the
+ * collection.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class HomeCollection extends AbstractPrincipalCollection implements IACL {
+
+    /**
+     * Name of this collection.
+     *
+     * @var string
+     */
+    public $collectionName = 'home';
+
+    /**
+     * Path to where the users' files are actually stored.
+     *
+     * @var string
+     */
+    protected $storagePath;
+
+    /**
+     * Creates the home collection.
+     *
+     * @param BackendInterface $principalBackend
+     * @param string $storagePath Where the actual files are stored.
+     * @param string $principalPrefix list of principals to iterate.
+     */
+    function __construct(BackendInterface $principalBackend, $storagePath, $principalPrefix = 'principals') {
+
+        parent::__construct($principalBackend, $principalPrefix);
+        $this->storagePath = $storagePath;
+
+    }
+
+    /**
+     * Returns the name of the node.
+     *
+     * This is used to generate the url.
+     *
+     * @return string
+     */
+    function getName() {
+
+        return $this->collectionName;
+
+    }
+
+    /**
+     * Returns a principals' collection of files.
+     *
+     * The passed array contains principal information, and is guaranteed to
+     * at least contain a uri item. Other properties may or may not be
+     * supplied by the authentication backend.
+     *
+     * @param array $principalInfo
+     * @return void
+     */
+    function getChildForPrincipal(array $principalInfo) {
+
+        $owner = $principalInfo['uri'];
+        $acl = [
+            [
+                'privilege' => '{DAV:}read',
+                'principal' => $owner,
+                'protected' => true,
+            ],
+            [
+                'privilege' => '{DAV:}write',
+                'principal' => $owner,
+                'protected' => true,
+            ],
+        ];
+
+        list(, $principalBaseName) = Uri\split($owner);
+
+        $path = $this->storagePath . '/' . $principalBaseName;
+
+        if (!is_dir($path)) {
+            mkdir($path, 0777, true);
+        }
+        return new Collection(
+            $path,
+            $acl,
+            $owner
+        );
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getOwner() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a group principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getGroup() {
+
+        return null;
+
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    function getACL() {
+
+        return [
+            [
+                'principal' => '{DAV:}authenticated',
+                'privilege' => '{DAV:}read',
+                'protected' => true,
+            ]
+        ];
+
+    }
+
+    /**
+     * Updates the ACL
+     *
+     * This method will receive a list of new ACE's as an array argument.
+     *
+     * @param array $acl
+     * @return void
+     */
+    function setACL(array $acl) {
+
+        throw new Forbidden('Setting ACL is not allowed here');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    function getSupportedPrivilegeSet() {
+
+        return null;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/IACL.php b/vendor/sabre/dav/lib/DAVACL/IACL.php
index 088ca3eec..81908d08f 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/IACL.php
+++ b/vendor/sabre/dav/lib/DAVACL/IACL.php
@@ -1,6 +1,7 @@
 <?php
 
 namespace Sabre\DAVACL;
+
 use Sabre\DAV;
 
 /**
@@ -8,7 +9,7 @@ use Sabre\DAV;
  *
  * If you want to add WebDAV ACL to a node, you must implement this class
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/IPrincipal.php b/vendor/sabre/dav/lib/DAVACL/IPrincipal.php
index d88a0289b..13728471e 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/IPrincipal.php
+++ b/vendor/sabre/dav/lib/DAVACL/IPrincipal.php
@@ -9,7 +9,7 @@ use Sabre\DAV;
  *
  * Implement this interface to define your own principals
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/IPrincipalCollection.php b/vendor/sabre/dav/lib/DAVACL/IPrincipalCollection.php
index 2c097f9d7..3ab8382fa 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/IPrincipalCollection.php
+++ b/vendor/sabre/dav/lib/DAVACL/IPrincipalCollection.php
@@ -10,11 +10,11 @@ use Sabre\DAV;
  * Implement this interface to ensure that your principal collection can be
  * searched using the principal-property-search REPORT.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IPrincipalCollection extends DAV\INode {
+interface IPrincipalCollection extends DAV\ICollection {
 
     /**
      * This method is used to search for principals matching a set of
@@ -28,15 +28,35 @@ interface IPrincipalCollection extends DAV\INode {
      * keys in searchProperties are the WebDAV property names, while the values
      * are the property values to search on.
      *
-     * If multiple properties are being searched on, the search should be
-     * AND'ed.
+     * By default, if multiple properties are submitted to this method, the
+     * various properties should be combined with 'AND'. If $test is set to
+     * 'anyof', it should be combined using 'OR'.
      *
      * This method should simply return a list of 'child names', which may be
      * used to call $this->getChild in the future.
      *
      * @param array $searchProperties
+     * @param string $test
      * @return array
      */
-    function searchPrincipals(array $searchProperties);
+    function searchPrincipals(array $searchProperties, $test = 'allof');
+
+    /**
+     * Finds a principal by its URI.
+     *
+     * This method may receive any type of uri, but mailto: addresses will be
+     * the most common.
+     *
+     * Implementation of this API is optional. It is currently used by the
+     * CalDAV system to find principals based on their email addresses. If this
+     * API is not implemented, some features may not work correctly.
+     *
+     * This method must return a relative principal path, or null, if the
+     * principal was not found or you refuse to find it.
+     *
+     * @param string $uri
+     * @return string
+     */
+    function findByUri($uri);
 
 }
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Plugin.php b/vendor/sabre/dav/lib/DAVACL/Plugin.php
index f9bf4bb44..601dffecc 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Plugin.php
+++ b/vendor/sabre/dav/lib/DAVACL/Plugin.php
@@ -1,7 +1,13 @@
 <?php
 
 namespace Sabre\DAVACL;
+
 use Sabre\DAV;
+use Sabre\DAV\INode;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\HTTP\RequestInterface;
+use Sabre\HTTP\ResponseInterface;
+use Sabre\Uri;
 
 /**
  * SabreDAV ACL Plugin
@@ -13,7 +19,7 @@ use Sabre\DAV;
  * property, defined in RFC5397 and the {DAV:}expand-property report, as
  * defined in RFC3253.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -53,9 +59,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @var array
      */
-    public $principalCollectionSet = array(
+    public $principalCollectionSet = [
         'principals',
-    );
+    ];
 
     /**
      * By default ACL is only enforced for nodes that have ACL support (the
@@ -81,15 +87,6 @@ class Plugin extends DAV\ServerPlugin {
     public $hideNodesFromListings = false;
 
     /**
-     * This string is prepended to the username of the currently logged in
-     * user. This allows the plugin to determine the principal path based on
-     * the username.
-     *
-     * @var string
-     */
-    public $defaultUsernamePath = 'principals';
-
-    /**
      * This list of properties are the properties a client can search on using
      * the {DAV:}principal-property-search report.
      *
@@ -97,10 +94,10 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @var array
      */
-    public $principalSearchPropertySet = array(
-        '{DAV:}displayname' => 'Display name',
+    public $principalSearchPropertySet = [
+        '{DAV:}displayname'                     => 'Display name',
         '{http://sabredav.org/ns}email-address' => 'Email address',
-    );
+    ];
 
     /**
      * Any principal uri's added here, will automatically be added to the list
@@ -109,7 +106,7 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @var array
      */
-    public $adminPrincipals = array();
+    public $adminPrincipals = [];
 
     /**
      * Returns a list of features added by this plugin.
@@ -118,9 +115,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    public function getFeatures() {
+    function getFeatures() {
 
-        return array('access-control', 'calendarserver-principal-property-search');
+        return ['access-control', 'calendarserver-principal-property-search'];
 
     }
 
@@ -130,9 +127,9 @@ class Plugin extends DAV\ServerPlugin {
      * @param string $uri
      * @return array
      */
-    public function getMethods($uri) {
+    function getMethods($uri) {
 
-        return array('ACL');
+        return ['ACL'];
 
     }
 
@@ -144,7 +141,7 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    public function getPluginName() {
+    function getPluginName() {
 
         return 'acl';
 
@@ -160,13 +157,13 @@ class Plugin extends DAV\ServerPlugin {
      * @param string $uri
      * @return array
      */
-    public function getSupportedReportSet($uri) {
+    function getSupportedReportSet($uri) {
 
-        return array(
+        return [
             '{DAV:}expand-property',
             '{DAV:}principal-property-search',
             '{DAV:}principal-search-property-set',
-        );
+        ];
 
     }
 
@@ -185,9 +182,9 @@ class Plugin extends DAV\ServerPlugin {
      * @throws Sabre\DAVACL\Exception\NeedPrivileges
      * @return bool
      */
-    public function checkPrivileges($uri, $privileges, $recursion = self::R_PARENT, $throwExceptions = true) {
+    function checkPrivileges($uri, $privileges, $recursion = self::R_PARENT, $throwExceptions = true) {
 
-        if (!is_array($privileges)) $privileges = array($privileges);
+        if (!is_array($privileges)) $privileges = [$privileges];
 
         $acl = $this->getCurrentUserPrivilegeSet($uri);
 
@@ -196,15 +193,15 @@ class Plugin extends DAV\ServerPlugin {
                 return true;
             } else {
                 if ($throwExceptions)
-                    throw new Exception\NeedPrivileges($uri,$privileges);
+                    throw new Exception\NeedPrivileges($uri, $privileges);
                 else
                     return false;
 
             }
         }
 
-        $failed = array();
-        foreach($privileges as $priv) {
+        $failed = [];
+        foreach ($privileges as $priv) {
 
             if (!in_array($priv, $acl)) {
                 $failed[] = $priv;
@@ -214,7 +211,7 @@ class Plugin extends DAV\ServerPlugin {
 
         if ($failed) {
             if ($throwExceptions)
-                throw new Exception\NeedPrivileges($uri,$failed);
+                throw new Exception\NeedPrivileges($uri, $failed);
             else
                 return false;
         }
@@ -230,16 +227,13 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string|null
      */
-    public function getCurrentUserPrincipal() {
+    function getCurrentUserPrincipal() {
 
         $authPlugin = $this->server->getPlugin('auth');
         if (is_null($authPlugin)) return null;
         /** @var $authPlugin Sabre\DAV\Auth\Plugin */
 
-        $userName = $authPlugin->getCurrentUser();
-        if (!$userName) return null;
-
-        return $this->defaultUsernamePath . '/' .  $userName;
+        return $authPlugin->getCurrentPrincipal();
 
     }
 
@@ -250,14 +244,14 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    public function getCurrentUserPrincipals() {
+    function getCurrentUserPrincipals() {
 
         $currentUser = $this->getCurrentUserPrincipal();
 
-        if (is_null($currentUser)) return array();
+        if (is_null($currentUser)) return [];
 
         return array_merge(
-            array($currentUser),
+            [$currentUser],
             $this->getPrincipalMembership($currentUser)
         );
 
@@ -269,7 +263,7 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @var array
      */
-    protected $principalMembershipCache = array();
+    protected $principalMembershipCache = [];
 
 
     /**
@@ -278,23 +272,23 @@ class Plugin extends DAV\ServerPlugin {
      * @param string $principal
      * @return array
      */
-    public function getPrincipalMembership($mainPrincipal) {
+    function getPrincipalMembership($mainPrincipal) {
 
         // First check our cache
         if (isset($this->principalMembershipCache[$mainPrincipal])) {
             return $this->principalMembershipCache[$mainPrincipal];
         }
 
-        $check = array($mainPrincipal);
-        $principals = array();
+        $check = [$mainPrincipal];
+        $principals = [];
 
-        while(count($check)) {
+        while (count($check)) {
 
             $principal = array_shift($check);
 
             $node = $this->server->tree->getNodeForPath($principal);
             if ($node instanceof IPrincipal) {
-                foreach($node->getGroupMembership() as $groupMember) {
+                foreach ($node->getGroupMembership() as $groupMember) {
 
                     if (!in_array($groupMember, $principals)) {
 
@@ -325,10 +319,10 @@ class Plugin extends DAV\ServerPlugin {
      * You can either get the list of privileges by a uri (path) or by
      * specifying a Node.
      *
-     * @param string|DAV\INode $node
+     * @param string|INode $node
      * @return array
      */
-    public function getSupportedPrivilegeSet($node) {
+    function getSupportedPrivilegeSet($node) {
 
         if (is_string($node)) {
             $node = $this->server->tree->getNodeForPath($node);
@@ -353,54 +347,54 @@ class Plugin extends DAV\ServerPlugin {
      */
     static function getDefaultSupportedPrivilegeSet() {
 
-        return array(
+        return [
             'privilege'  => '{DAV:}all',
             'abstract'   => true,
-            'aggregates' => array(
-                array(
+            'aggregates' => [
+                [
                     'privilege'  => '{DAV:}read',
-                    'aggregates' => array(
-                        array(
+                    'aggregates' => [
+                        [
                             'privilege' => '{DAV:}read-acl',
-                            'abstract'  => true,
-                        ),
-                        array(
+                            'abstract'  => false,
+                        ],
+                        [
                             'privilege' => '{DAV:}read-current-user-privilege-set',
-                            'abstract'  => true,
-                        ),
-                    ),
-                ), // {DAV:}read
-                array(
+                            'abstract'  => false,
+                        ],
+                    ],
+                ], // {DAV:}read
+                [
                     'privilege'  => '{DAV:}write',
-                    'aggregates' => array(
-                        array(
+                    'aggregates' => [
+                        [
                             'privilege' => '{DAV:}write-acl',
-                            'abstract'  => true,
-                        ),
-                        array(
+                            'abstract'  => false,
+                        ],
+                        [
                             'privilege' => '{DAV:}write-properties',
-                            'abstract'  => true,
-                        ),
-                        array(
+                            'abstract'  => false,
+                        ],
+                        [
                             'privilege' => '{DAV:}write-content',
-                            'abstract'  => true,
-                        ),
-                        array(
+                            'abstract'  => false,
+                        ],
+                        [
                             'privilege' => '{DAV:}bind',
-                            'abstract'  => true,
-                        ),
-                        array(
+                            'abstract'  => false,
+                        ],
+                        [
                             'privilege' => '{DAV:}unbind',
-                            'abstract'  => true,
-                        ),
-                        array(
+                            'abstract'  => false,
+                        ],
+                        [
                             'privilege' => '{DAV:}unlock',
-                            'abstract'  => true,
-                        ),
-                    ),
-                ), // {DAV:}write
-            ),
-        ); // {DAV:}all
+                            'abstract'  => false,
+                        ],
+                    ],
+                ], // {DAV:}write
+            ],
+        ]; // {DAV:}all
 
     }
 
@@ -415,68 +409,65 @@ class Plugin extends DAV\ServerPlugin {
      *   - abstract
      *   - concrete
      *
-     * @param string|DAV\INode $node
+     * @param string|INode $node
      * @return array
      */
-    final public function getFlatPrivilegeSet($node) {
+    final function getFlatPrivilegeSet($node) {
 
         $privs = $this->getSupportedPrivilegeSet($node);
 
-        $flat = array();
-        $this->getFPSTraverse($privs, null, $flat);
+        $fpsTraverse = null;
+        $fpsTraverse = function($priv, $concrete, &$flat) use (&$fpsTraverse) {
 
-        return $flat;
+            $myPriv = [
+                'privilege'  => $priv['privilege'],
+                'abstract'   => isset($priv['abstract']) && $priv['abstract'],
+                'aggregates' => [],
+                'concrete'   => isset($priv['abstract']) && $priv['abstract'] ? $concrete : $priv['privilege'],
+            ];
 
-    }
+            if (isset($priv['aggregates'])) {
 
-    /**
-     * Traverses the privilege set tree for reordering
-     *
-     * This function is solely used by getFlatPrivilegeSet, and would have been
-     * a closure if it wasn't for the fact I need to support PHP 5.2.
-     *
-     * @param array $priv
-     * @param $concrete
-     * @param array $flat
-     * @return void
-     */
-    final private function getFPSTraverse($priv, $concrete, &$flat) {
+                foreach ($priv['aggregates'] as $subPriv) {
 
-        $myPriv = array(
-            'privilege' => $priv['privilege'],
-            'abstract' => isset($priv['abstract']) && $priv['abstract'],
-            'aggregates' => array(),
-            'concrete' => isset($priv['abstract']) && $priv['abstract']?$concrete:$priv['privilege'],
-        );
+                    $myPriv['aggregates'][] = $subPriv['privilege'];
 
-        if (isset($priv['aggregates']))
-            foreach($priv['aggregates'] as $subPriv) $myPriv['aggregates'][] = $subPriv['privilege'];
+                }
 
-        $flat[$priv['privilege']] = $myPriv;
+            }
+
+            $flat[$priv['privilege']] = $myPriv;
 
-        if (isset($priv['aggregates'])) {
+            if (isset($priv['aggregates'])) {
 
-            foreach($priv['aggregates'] as $subPriv) {
+                foreach ($priv['aggregates'] as $subPriv) {
 
-                $this->getFPSTraverse($subPriv, $myPriv['concrete'], $flat);
+                    $fpsTraverse($subPriv, $myPriv['concrete'], $flat);
+
+                }
 
             }
 
-        }
+        };
+
+        $flat = [];
+        $fpsTraverse($privs, null, $flat);
+
+        return $flat;
 
     }
 
     /**
      * Returns the full ACL list.
      *
-     * Either a uri or a DAV\INode may be passed.
+     * Either a uri or a INode may be passed.
      *
      * null will be returned if the node doesn't support ACLs.
      *
      * @param string|DAV\INode $node
      * @return array
      */
-    public function getACL($node) {
+    function getACL($node) {
 
         if (is_string($node)) {
             $node = $this->server->tree->getNodeForPath($node);
@@ -485,12 +476,12 @@ class Plugin extends DAV\ServerPlugin {
             return null;
         }
         $acl = $node->getACL();
-        foreach($this->adminPrincipals as $adminPrincipal) {
-            $acl[] = array(
+        foreach ($this->adminPrincipals as $adminPrincipal) {
+            $acl[] = [
                 'principal' => $adminPrincipal,
                 'privilege' => '{DAV:}all',
                 'protected' => true,
-            );
+            ];
         }
         return $acl;
 
@@ -507,7 +498,7 @@ class Plugin extends DAV\ServerPlugin {
      * @param string|DAV\INode $node
      * @return array
      */
-    public function getCurrentUserPrivilegeSet($node) {
+    function getCurrentUserPrivilegeSet($node) {
 
         if (is_string($node)) {
             $node = $this->server->tree->getNodeForPath($node);
@@ -519,13 +510,13 @@ class Plugin extends DAV\ServerPlugin {
 
         $principals = $this->getCurrentUserPrincipals();
 
-        $collected = array();
+        $collected = [];
 
-        foreach($acl as $ace) {
+        foreach ($acl as $ace) {
 
             $principal = $ace['principal'];
 
-            switch($principal) {
+            switch ($principal) {
 
                 case '{DAV:}owner' :
                     $owner = $node->getOwner();
@@ -564,13 +555,13 @@ class Plugin extends DAV\ServerPlugin {
         // Now we deduct all aggregated privileges.
         $flat = $this->getFlatPrivilegeSet($node);
 
-        $collected2 = array();
-        while(count($collected)) {
+        $collected2 = [];
+        while (count($collected)) {
 
             $current = array_pop($collected);
             $collected2[] = $current['privilege'];
 
-            foreach($flat[$current['privilege']]['aggregates'] as $subPriv) {
+            foreach ($flat[$current['privilege']]['aggregates'] as $subPriv) {
                 $collected2[] = $subPriv;
                 $collected[] = $flat[$subPriv];
             }
@@ -581,6 +572,37 @@ class Plugin extends DAV\ServerPlugin {
 
     }
 
+
+    /**
+     * Returns a principal based on its uri.
+     *
+     * Returns null if the principal could not be found.
+     *
+     * @param string $uri
+     * @return null|string
+     */
+    function getPrincipalByUri($uri) {
+
+        $result = null;
+        $collections = $this->principalCollectionSet;
+        foreach ($collections as $collection) {
+
+            $principalCollection = $this->server->tree->getNodeForPath($collection);
+            if (!$principalCollection instanceof IPrincipalCollection) {
+                // Not a principal collection, we're simply going to ignore
+                // this.
+                continue;
+            }
+
+            $result = $principalCollection->findByUri($uri);
+            if ($result) {
+                return $result;
+            }
+
+        }
+
+    }
+
     /**
      * Principal property search
      *
@@ -598,21 +620,22 @@ class Plugin extends DAV\ServerPlugin {
      * @param string $collectionUri      The principal collection to search on.
      *                                   If this is ommitted, the standard
      *                                   principal collection-set will be used.
+     * @param string $test               "allof" to use AND to search the
+     *                                   properties. 'anyof' for OR.
      * @return array     This method returns an array structure similar to
      *                  Sabre\DAV\Server::getPropertiesForPath. Returned
      *                  properties are index by a HTTP status code.
-     *
      */
-    public function principalSearch(array $searchProperties, array $requestedProperties, $collectionUri = null) {
+    function principalSearch(array $searchProperties, array $requestedProperties, $collectionUri = null, $test = 'allof') {
 
         if (!is_null($collectionUri)) {
-            $uris = array($collectionUri);
+            $uris = [$collectionUri];
         } else {
             $uris = $this->principalCollectionSet;
         }
 
-        $lookupResults = array();
-        foreach($uris as $uri) {
+        $lookupResults = [];
+        foreach ($uris as $uri) {
 
             $principalCollection = $this->server->tree->getNodeForPath($uri);
             if (!$principalCollection instanceof IPrincipalCollection) {
@@ -621,16 +644,16 @@ class Plugin extends DAV\ServerPlugin {
                 continue;
             }
 
-            $results = $principalCollection->searchPrincipals($searchProperties);
-            foreach($results as $result) {
-                $lookupResults[] = rtrim($uri,'/') . '/' . $result;
+            $results = $principalCollection->searchPrincipals($searchProperties, $test);
+            foreach ($results as $result) {
+                $lookupResults[] = rtrim($uri, '/') . '/' . $result;
             }
 
         }
 
-        $matches = array();
+        $matches = [];
 
-        foreach($lookupResults as $lookupResult) {
+        foreach ($lookupResults as $lookupResult) {
 
             list($matches[]) = $this->server->getPropertiesForPath($lookupResult, $requestedProperties, 0);
 
@@ -648,18 +671,18 @@ class Plugin extends DAV\ServerPlugin {
      * @param DAV\Server $server
      * @return void
      */
-    public function initialize(DAV\Server $server) {
+    function initialize(DAV\Server $server) {
 
         $this->server = $server;
-        $server->subscribeEvent('beforeGetProperties',array($this,'beforeGetProperties'));
-
-        $server->subscribeEvent('beforeMethod', array($this,'beforeMethod'),20);
-        $server->subscribeEvent('beforeBind', array($this,'beforeBind'),20);
-        $server->subscribeEvent('beforeUnbind', array($this,'beforeUnbind'),20);
-        $server->subscribeEvent('updateProperties',array($this,'updateProperties'));
-        $server->subscribeEvent('beforeUnlock', array($this,'beforeUnlock'),20);
-        $server->subscribeEvent('report',array($this,'report'));
-        $server->subscribeEvent('unknownMethod', array($this, 'unknownMethod'));
+        $server->on('propFind',            [$this, 'propFind'], 20);
+        $server->on('beforeMethod',        [$this, 'beforeMethod'], 20);
+        $server->on('beforeBind',          [$this, 'beforeBind'], 20);
+        $server->on('beforeUnbind',        [$this, 'beforeUnbind'], 20);
+        $server->on('propPatch',           [$this, 'propPatch']);
+        $server->on('beforeUnlock',        [$this, 'beforeUnlock'], 20);
+        $server->on('report',              [$this, 'report']);
+        $server->on('method:ACL',          [$this, 'httpAcl']);
+        $server->on('onHTMLActionsPanel',  [$this, 'htmlActionsPanel']);
 
         array_push($server->protectedProperties,
             '{DAV:}alternate-URI-set',
@@ -682,34 +705,40 @@ class Plugin extends DAV\ServerPlugin {
 
         // Mapping the group-member-set property to the HrefList property
         // class.
-        $server->propertyMap['{DAV:}group-member-set'] = 'Sabre\\DAV\\Property\\HrefList';
+        $server->xml->elementMap['{DAV:}group-member-set'] = 'Sabre\\DAV\\Xml\\Property\\Href';
+        $server->xml->elementMap['{DAV:}acl'] = 'Sabre\\DAVACL\\Xml\\Property\\Acl';
+        $server->xml->elementMap['{DAV:}expand-property'] = 'Sabre\\DAVACL\\Xml\\Request\\ExpandPropertyReport';
+        $server->xml->elementMap['{DAV:}principal-property-search'] = 'Sabre\\DAVACL\\Xml\\Request\\PrincipalPropertySearchReport';
+        $server->xml->elementMap['{DAV:}principal-search-property-set'] = 'Sabre\\DAVACL\\Xml\\Request\\PrincipalSearchPropertySetReport';
 
     }
 
-
     /* {{{ Event handlers */
 
     /**
      * Triggered before any method is handled
      *
-     * @param string $method
-     * @param string $uri
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
      * @return void
      */
-    public function beforeMethod($method, $uri) {
+    function beforeMethod(RequestInterface $request, ResponseInterface $response) {
+
+        $method = $request->getMethod();
+        $path = $request->getPath();
 
-        $exists = $this->server->tree->nodeExists($uri);
+        $exists = $this->server->tree->nodeExists($path);
 
         // If the node doesn't exists, none of these checks apply
         if (!$exists) return;
 
-        switch($method) {
+        switch ($method) {
 
             case 'GET' :
             case 'HEAD' :
             case 'OPTIONS' :
                 // For these 3 we only need to know if the node is readable.
-                $this->checkPrivileges($uri,'{DAV:}read');
+                $this->checkPrivileges($path, '{DAV:}read');
                 break;
 
             case 'PUT' :
@@ -719,16 +748,16 @@ class Plugin extends DAV\ServerPlugin {
                 // already exists, and bind on the parent if the node is being
                 // created.
                 // The bind privilege is handled in the beforeBind event.
-                $this->checkPrivileges($uri,'{DAV:}write-content');
+                $this->checkPrivileges($path, '{DAV:}write-content');
                 break;
 
 
             case 'PROPPATCH' :
-                $this->checkPrivileges($uri,'{DAV:}write-properties');
+                $this->checkPrivileges($path, '{DAV:}write-properties');
                 break;
 
             case 'ACL' :
-                $this->checkPrivileges($uri,'{DAV:}write-acl');
+                $this->checkPrivileges($path, '{DAV:}write-acl');
                 break;
 
             case 'COPY' :
@@ -744,7 +773,7 @@ class Plugin extends DAV\ServerPlugin {
                 //
                 // If MOVE is used beforeUnbind will also be used to check if
                 // the sourcenode can be deleted.
-                $this->checkPrivileges($uri,'{DAV:}read',self::R_RECURSIVE);
+                $this->checkPrivileges($path, '{DAV:}read', self::R_RECURSIVE);
 
                 break;
 
@@ -761,10 +790,10 @@ class Plugin extends DAV\ServerPlugin {
      * @param string $uri
      * @return void
      */
-    public function beforeBind($uri) {
+    function beforeBind($uri) {
 
-        list($parentUri,$nodeName) = DAV\URLUtil::splitPath($uri);
-        $this->checkPrivileges($parentUri,'{DAV:}bind');
+        list($parentUri) = Uri\split($uri);
+        $this->checkPrivileges($parentUri, '{DAV:}bind');
 
     }
 
@@ -777,10 +806,10 @@ class Plugin extends DAV\ServerPlugin {
      * @param string $uri
      * @return void
      */
-    public function beforeUnbind($uri) {
+    function beforeUnbind($uri) {
 
-        list($parentUri,$nodeName) = DAV\URLUtil::splitPath($uri);
-        $this->checkPrivileges($parentUri,'{DAV:}unbind',self::R_RECURSIVEPARENTS);
+        list($parentUri) = Uri\split($uri);
+        $this->checkPrivileges($parentUri, '{DAV:}unbind', self::R_RECURSIVEPARENTS);
 
     }
 
@@ -792,7 +821,7 @@ class Plugin extends DAV\ServerPlugin {
      * @TODO: not yet implemented
      * @return void
      */
-    public function beforeUnlock($uri, DAV\Locks\LockInfo $lock) {
+    function beforeUnlock($uri, DAV\Locks\LockInfo $lock) {
 
 
     }
@@ -800,28 +829,33 @@ class Plugin extends DAV\ServerPlugin {
     /**
      * Triggered before properties are looked up in specific nodes.
      *
-     * @param string $uri
+     * @param DAV\PropFind $propFind
      * @param DAV\INode $node
      * @param array $requestedProperties
      * @param array $returnedProperties
      * @TODO really should be broken into multiple methods, or even a class.
      * @return bool
      */
-    public function beforeGetProperties($uri, DAV\INode $node, &$requestedProperties, &$returnedProperties) {
+    function propFind(DAV\PropFind $propFind, DAV\INode $node) {
 
-        // Checking the read permission
-        if (!$this->checkPrivileges($uri,'{DAV:}read',self::R_PARENT,false)) {
+        $path = $propFind->getPath();
 
+        // Checking the read permission
+        if (!$this->checkPrivileges($path, '{DAV:}read', self::R_PARENT, false)) {
             // User is not allowed to read properties
+
+            // Returning false causes the property-fetching system to pretend
+            // that the node does not exist, and will cause it to be hidden
+            // from listings such as PROPFIND or the browser plugin.
             if ($this->hideNodesFromListings) {
                 return false;
             }
 
-            // Marking all requested properties as '403'.
-            foreach($requestedProperties as $key=>$requestedProperty) {
-                unset($requestedProperties[$key]);
-                $returnedProperties[403][$requestedProperty] = null;
+            // Otherwise we simply mark every property as 403.
+            foreach ($propFind->getRequestedProperties() as $requestedProperty) {
+                $propFind->set($requestedProperty, null, 403);
             }
+
             return;
 
         }
@@ -829,116 +863,78 @@ class Plugin extends DAV\ServerPlugin {
         /* Adding principal properties */
         if ($node instanceof IPrincipal) {
 
-            if (false !== ($index = array_search('{DAV:}alternate-URI-set', $requestedProperties))) {
-
-                unset($requestedProperties[$index]);
-                $returnedProperties[200]['{DAV:}alternate-URI-set'] = new DAV\Property\HrefList($node->getAlternateUriSet());
-
-            }
-            if (false !== ($index = array_search('{DAV:}principal-URL', $requestedProperties))) {
-
-                unset($requestedProperties[$index]);
-                $returnedProperties[200]['{DAV:}principal-URL'] = new DAV\Property\Href($node->getPrincipalUrl() . '/');
-
-            }
-            if (false !== ($index = array_search('{DAV:}group-member-set', $requestedProperties))) {
-
-                unset($requestedProperties[$index]);
-                $returnedProperties[200]['{DAV:}group-member-set'] = new DAV\Property\HrefList($node->getGroupMemberSet());
-
-            }
-            if (false !== ($index = array_search('{DAV:}group-membership', $requestedProperties))) {
-
-                unset($requestedProperties[$index]);
-                $returnedProperties[200]['{DAV:}group-membership'] = new DAV\Property\HrefList($node->getGroupMembership());
-
-            }
-
-            if (false !== ($index = array_search('{DAV:}displayname', $requestedProperties))) {
-
-                $returnedProperties[200]['{DAV:}displayname'] = $node->getDisplayName();
-
-            }
+            $propFind->handle('{DAV:}alternate-URI-set', function() use ($node) {
+                return new DAV\Xml\Property\Href($node->getAlternateUriSet());
+            });
+            $propFind->handle('{DAV:}principal-URL', function() use ($node) {
+                return new DAV\Xml\Property\Href($node->getPrincipalUrl() . '/');
+            });
+            $propFind->handle('{DAV:}group-member-set', function() use ($node) {
+                $members = $node->getGroupMemberSet();
+                foreach ($members as $k => $member) {
+                    $members[$k] = rtrim($member, '/') . '/';
+                }
+                return new DAV\Xml\Property\Href($members);
+            });
+            $propFind->handle('{DAV:}group-membership', function() use ($node) {
+                $members = $node->getGroupMembership();
+                foreach ($members as $k => $member) {
+                    $members[$k] = rtrim($member, '/') . '/';
+                }
+                return new DAV\Xml\Property\Href($members);
+            });
+            $propFind->handle('{DAV:}displayname', [$node, 'getDisplayName']);
 
         }
-        if (false !== ($index = array_search('{DAV:}principal-collection-set', $requestedProperties))) {
 
-            unset($requestedProperties[$index]);
+        $propFind->handle('{DAV:}principal-collection-set', function() {
+
             $val = $this->principalCollectionSet;
             // Ensuring all collections end with a slash
-            foreach($val as $k=>$v) $val[$k] = $v . '/';
-            $returnedProperties[200]['{DAV:}principal-collection-set'] = new DAV\Property\HrefList($val);
-
-        }
-        if (false !== ($index = array_search('{DAV:}current-user-principal', $requestedProperties))) {
+            foreach ($val as $k => $v) $val[$k] = $v . '/';
+            return new DAV\Xml\Property\Href($val);
 
-            unset($requestedProperties[$index]);
+        });
+        $propFind->handle('{DAV:}current-user-principal', function() {
             if ($url = $this->getCurrentUserPrincipal()) {
-                $returnedProperties[200]['{DAV:}current-user-principal'] = new Property\Principal(Property\Principal::HREF, $url . '/');
+                return new Xml\Property\Principal(Xml\Property\Principal::HREF, $url . '/');
             } else {
-                $returnedProperties[200]['{DAV:}current-user-principal'] = new Property\Principal(Property\Principal::UNAUTHENTICATED);
+                return new Xml\Property\Principal(Xml\Property\Principal::UNAUTHENTICATED);
             }
-
-        }
-        if (false !== ($index = array_search('{DAV:}supported-privilege-set', $requestedProperties))) {
-
-            unset($requestedProperties[$index]);
-            $returnedProperties[200]['{DAV:}supported-privilege-set'] = new Property\SupportedPrivilegeSet($this->getSupportedPrivilegeSet($node));
-
-        }
-        if (false !== ($index = array_search('{DAV:}current-user-privilege-set', $requestedProperties))) {
-
-            if (!$this->checkPrivileges($uri, '{DAV:}read-current-user-privilege-set', self::R_PARENT, false)) {
-                $returnedProperties[403]['{DAV:}current-user-privilege-set'] = null;
-                unset($requestedProperties[$index]);
+        });
+        $propFind->handle('{DAV:}supported-privilege-set', function() use ($node) {
+            return new Xml\Property\SupportedPrivilegeSet($this->getSupportedPrivilegeSet($node));
+        });
+        $propFind->handle('{DAV:}current-user-privilege-set', function() use ($node, $propFind, $path) {
+            if (!$this->checkPrivileges($path, '{DAV:}read-current-user-privilege-set', self::R_PARENT, false)) {
+                $propFind->set('{DAV:}current-user-privilege-set', null, 403);
             } else {
                 $val = $this->getCurrentUserPrivilegeSet($node);
                 if (!is_null($val)) {
-                    unset($requestedProperties[$index]);
-                    $returnedProperties[200]['{DAV:}current-user-privilege-set'] = new Property\CurrentUserPrivilegeSet($val);
+                    return new Xml\Property\CurrentUserPrivilegeSet($val);
                 }
             }
-
-        }
-
-        /* The ACL property contains all the permissions */
-        if (false !== ($index = array_search('{DAV:}acl', $requestedProperties))) {
-
-            if (!$this->checkPrivileges($uri, '{DAV:}read-acl', self::R_PARENT, false)) {
-
-                unset($requestedProperties[$index]);
-                $returnedProperties[403]['{DAV:}acl'] = null;
-
+        });
+        $propFind->handle('{DAV:}acl', function() use ($node, $propFind, $path) {
+            /* The ACL property contains all the permissions */
+            if (!$this->checkPrivileges($path, '{DAV:}read-acl', self::R_PARENT, false)) {
+                $propFind->set('{DAV:}acl', null, 403);
             } else {
-
                 $acl = $this->getACL($node);
                 if (!is_null($acl)) {
-                    unset($requestedProperties[$index]);
-                    $returnedProperties[200]['{DAV:}acl'] = new Property\Acl($this->getACL($node));
+                    return new Xml\Property\Acl($this->getACL($node));
                 }
-
             }
-
-        }
-
-        /* The acl-restrictions property contains information on how privileges
-         * must behave.
-         */
-        if (false !== ($index = array_search('{DAV:}acl-restrictions', $requestedProperties))) {
-            unset($requestedProperties[$index]);
-            $returnedProperties[200]['{DAV:}acl-restrictions'] = new Property\AclRestrictions();
-        }
+        });
+        $propFind->handle('{DAV:}acl-restrictions', function() {
+            return new Xml\Property\AclRestrictions();
+        });
 
         /* Adding ACL properties */
         if ($node instanceof IACL) {
-
-            if (false !== ($index = array_search('{DAV:}owner', $requestedProperties))) {
-
-                unset($requestedProperties[$index]);
-                $returnedProperties[200]['{DAV:}owner'] = new DAV\Property\Href($node->getOwner() . '/');
-
-            }
-
+            $propFind->handle('{DAV:}owner', function() use ($node) {
+                return new DAV\Xml\Property\Href($node->getOwner() . '/');
+            });
         }
 
     }
@@ -947,42 +943,36 @@ class Plugin extends DAV\ServerPlugin {
      * This method intercepts PROPPATCH methods and make sure the
      * group-member-set is updated correctly.
      *
-     * @param array $propertyDelta
-     * @param array $result
-     * @param DAV\INode $node
-     * @return bool
+     * @param string $path
+     * @param DAV\PropPatch $propPatch
+     * @return void
      */
-    public function updateProperties(&$propertyDelta, &$result, DAV\INode $node) {
-
-        if (!array_key_exists('{DAV:}group-member-set', $propertyDelta))
-            return;
-
-        if (is_null($propertyDelta['{DAV:}group-member-set'])) {
-            $memberSet = array();
-        } elseif ($propertyDelta['{DAV:}group-member-set'] instanceof DAV\Property\HrefList) {
-            $memberSet = array_map(
-                array($this->server,'calculateUri'),
-                $propertyDelta['{DAV:}group-member-set']->getHrefs()
-            );
-        } else {
-            throw new DAV\Exception('The group-member-set property MUST be an instance of Sabre\DAV\Property\HrefList or null');
-        }
-
-        if (!($node instanceof IPrincipal)) {
-            $result[403]['{DAV:}group-member-set'] = null;
-            unset($propertyDelta['{DAV:}group-member-set']);
-
-            // Returning false will stop the updateProperties process
-            return false;
-        }
+    function propPatch($path, DAV\PropPatch $propPatch) {
+
+        $propPatch->handle('{DAV:}group-member-set', function($value) use ($path) {
+            if (is_null($value)) {
+                $memberSet = [];
+            } elseif ($value instanceof DAV\Xml\Property\Href) {
+                $memberSet = array_map(
+                    [$this->server, 'calculateUri'],
+                    $value->getHrefs()
+                );
+            } else {
+                throw new DAV\Exception('The group-member-set property MUST be an instance of Sabre\DAV\Property\HrefList or null');
+            }
+            $node = $this->server->tree->getNodeForPath($path);
+            if (!($node instanceof IPrincipal)) {
+                // Fail
+                return false;
+            }
 
-        $node->setGroupMemberSet($memberSet);
-        // We must also clear our cache, just in case
+            $node->setGroupMemberSet($memberSet);
+            // We must also clear our cache, just in case
 
-        $this->principalMembershipCache = array();
+            $this->principalMembershipCache = [];
 
-        $result[200]['{DAV:}group-member-set'] = null;
-        unset($propertyDelta['{DAV:}group-member-set']);
+            return true;
+        });
 
     }
 
@@ -990,21 +980,25 @@ class Plugin extends DAV\ServerPlugin {
      * This method handles HTTP REPORT requests
      *
      * @param string $reportName
-     * @param \DOMNode $dom
+     * @param mixed $report
+     * @param mixed $path
      * @return bool
      */
-    public function report($reportName, $dom) {
+    function report($reportName, $report, $path) {
 
-        switch($reportName) {
+        switch ($reportName) {
 
             case '{DAV:}principal-property-search' :
-                $this->principalPropertySearchReport($dom);
+                $this->server->transactionType = 'report-principal-property-search';
+                $this->principalPropertySearchReport($report);
                 return false;
             case '{DAV:}principal-search-property-set' :
-                $this->principalSearchPropertySetReport($dom);
+                $this->server->transactionType = 'report-principal-search-property-set';
+                $this->principalSearchPropertySetReport($report);
                 return false;
             case '{DAV:}expand-property' :
-                $this->expandPropertyReport($dom);
+                $this->server->transactionType = 'report-expand-property';
+                $this->expandPropertyReport($report);
                 return false;
 
         }
@@ -1012,45 +1006,31 @@ class Plugin extends DAV\ServerPlugin {
     }
 
     /**
-     * This event is triggered for any HTTP method that is not known by the
-     * webserver.
+     * This method is responsible for handling the 'ACL' event.
      *
-     * @param string $method
-     * @param string $uri
+     * @param RequestInterface $request
+     * @param ResponseInterface $response
      * @return bool
      */
-    public function unknownMethod($method, $uri) {
+    function httpAcl(RequestInterface $request, ResponseInterface $response) {
 
-        if ($method!=='ACL') return;
+        $path = $request->getPath();
+        $body = $request->getBodyAsString();
 
-        $this->httpACL($uri);
-        return false;
-
-    }
-
-    /**
-     * This method is responsible for handling the 'ACL' event.
-     *
-     * @param string $uri
-     * @return void
-     */
-    public function httpACL($uri) {
-
-        $body = $this->server->httpRequest->getBody(true);
-        $dom = DAV\XMLUtil::loadDOMDocument($body);
+        if (!$body) {
+            throw new DAV\Exception\BadRequest('XML body expected in ACL request');
+        }
 
-        $newAcl =
-            Property\Acl::unserialize($dom->firstChild)
-            ->getPrivileges();
+        $acl = $this->server->xml->expect('{DAV:}acl', $body);
+        $newAcl = $acl->getPrivileges();
 
         // Normalizing urls
-        foreach($newAcl as $k=>$newAce) {
+        foreach ($newAcl as $k => $newAce) {
             $newAcl[$k]['principal'] = $this->server->calculateUri($newAce['principal']);
         }
+        $node = $this->server->tree->getNodeForPath($path);
 
-        $node = $this->server->tree->getNodeForPath($uri);
-
-        if (!($node instanceof IACL)) {
+        if (!$node instanceof IACL) {
             throw new DAV\Exception\MethodNotAllowed('This node does not support the ACL method');
         }
 
@@ -1060,12 +1040,12 @@ class Plugin extends DAV\ServerPlugin {
 
         /* Checking if protected principals from the existing principal set are
            not overwritten. */
-        foreach($oldAcl as $oldAce) {
+        foreach ($oldAcl as $oldAce) {
 
             if (!isset($oldAce['protected']) || !$oldAce['protected']) continue;
 
             $found = false;
-            foreach($newAcl as $newAce) {
+            foreach ($newAcl as $newAce) {
                 if (
                     $newAce['privilege'] === $oldAce['privilege'] &&
                     $newAce['principal'] === $oldAce['principal'] &&
@@ -1079,7 +1059,7 @@ class Plugin extends DAV\ServerPlugin {
 
         }
 
-        foreach($newAcl as $newAce) {
+        foreach ($newAcl as $newAce) {
 
             // Do we recognize the privilege
             if (!isset($supportedPrivileges[$newAce['privilege']])) {
@@ -1103,6 +1083,11 @@ class Plugin extends DAV\ServerPlugin {
         }
         $node->setACL($newAcl);
 
+        $response->setStatus(200);
+
+        // Breaking the event chain, because we handled this method.
+        return false;
+
     }
 
     /* }}} */
@@ -1120,73 +1105,24 @@ class Plugin extends DAV\ServerPlugin {
      * Other rfc's, such as ACL rely on this report, so it made sense to put
      * it in this plugin.
      *
-     * @param \DOMElement $dom
+     * @param Xml\Request\ExpandPropertyReport $report
      * @return void
      */
-    protected function expandPropertyReport($dom) {
+    protected function expandPropertyReport($report) {
 
-        $requestedProperties = $this->parseExpandPropertyReportRequest($dom->firstChild->firstChild);
         $depth = $this->server->getHTTPDepth(0);
         $requestUri = $this->server->getRequestUri();
 
-        $result = $this->expandProperties($requestUri,$requestedProperties,$depth);
-
-        $dom = new \DOMDocument('1.0','utf-8');
-        $dom->formatOutput = true;
-        $multiStatus = $dom->createElement('d:multistatus');
-        $dom->appendChild($multiStatus);
-
-        // Adding in default namespaces
-        foreach($this->server->xmlNamespaces as $namespace=>$prefix) {
-
-            $multiStatus->setAttribute('xmlns:' . $prefix,$namespace);
-
-        }
-
-        foreach($result as $response) {
-            $response->serialize($this->server, $multiStatus);
-        }
-
-        $xml = $dom->saveXML();
-        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->sendStatus(207);
-        $this->server->httpResponse->sendBody($xml);
-
-    }
-
-    /**
-     * This method is used by expandPropertyReport to parse
-     * out the entire HTTP request.
-     *
-     * @param \DOMElement $node
-     * @return array
-     */
-    protected function parseExpandPropertyReportRequest($node) {
-
-        $requestedProperties = array();
-        do {
-
-            if (DAV\XMLUtil::toClarkNotation($node)!=='{DAV:}property') continue;
-
-            if ($node->firstChild) {
-
-                $children = $this->parseExpandPropertyReportRequest($node->firstChild);
-
-            } else {
-
-                $children = array();
-
-            }
-
-            $namespace = $node->getAttribute('namespace');
-            if (!$namespace) $namespace = 'DAV:';
-
-            $propName = '{'.$namespace.'}' . $node->getAttribute('name');
-            $requestedProperties[$propName] = $children;
+        $result = $this->expandProperties($requestUri, $report->properties, $depth);
 
-        } while ($node = $node->nextSibling);
-
-        return $requestedProperties;
+        $xml = $this->server->xml->write(
+            '{DAV:}multistatus',
+            new DAV\Xml\Response\MultiStatus($result),
+            $this->server->getBaseUri()
+        );
+        $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $this->server->httpResponse->setStatus(207);
+        $this->server->httpResponse->setBody($xml);
 
     }
 
@@ -1203,33 +1139,39 @@ class Plugin extends DAV\ServerPlugin {
 
         $foundProperties = $this->server->getPropertiesForPath($path, array_keys($requestedProperties), $depth);
 
-        $result = array();
+        $result = [];
 
-        foreach($foundProperties as $node) {
+        foreach ($foundProperties as $node) {
 
-            foreach($requestedProperties as $propertyName=>$childRequestedProperties) {
+            foreach ($requestedProperties as $propertyName => $childRequestedProperties) {
 
                 // We're only traversing if sub-properties were requested
-                if(count($childRequestedProperties)===0) continue;
+                if (count($childRequestedProperties) === 0) continue;
 
                 // We only have to do the expansion if the property was found
                 // and it contains an href element.
-                if (!array_key_exists($propertyName,$node[200])) continue;
+                if (!array_key_exists($propertyName, $node[200])) continue;
 
-                if ($node[200][$propertyName] instanceof DAV\Property\IHref) {
-                    $hrefs = array($node[200][$propertyName]->getHref());
-                } elseif ($node[200][$propertyName] instanceof DAV\Property\HrefList) {
-                    $hrefs = $node[200][$propertyName]->getHrefs();
+                if (!$node[200][$propertyName] instanceof DAV\Xml\Property\Href) {
+                    continue;
                 }
 
-                $childProps = array();
-                foreach($hrefs as $href) {
-                    $childProps = array_merge($childProps, $this->expandProperties($href, $childRequestedProperties, 0));
+                $childHrefs = $node[200][$propertyName]->getHrefs();
+                $childProps = [];
+
+                foreach ($childHrefs as $href) {
+                    // Gathering the result of the children
+                    $childProps[] = [
+                        'name'  => '{DAV:}response',
+                        'value' => $this->expandProperties($href, $childRequestedProperties, 0)[0]
+                    ];
                 }
-                $node[200][$propertyName] = new DAV\Property\ResponseList($childProps);
+
+                // Replacing the property with its expannded form.
+                $node[200][$propertyName] = $childProps;
 
             }
-            $result[] = new DAV\Property\Response($node['href'], $node);
+            $result[] = new DAV\Xml\Element\Response($node['href'], $node);
 
         }
 
@@ -1245,57 +1187,49 @@ class Plugin extends DAV\ServerPlugin {
      * of properties the client may search on, using the
      * {DAV:}principal-property-search report.
      *
-     * @param \DOMDocument $dom
+     * @param Xml\Request\PrincipalSearchPropertySetReport $report
      * @return void
      */
-    protected function principalSearchPropertySetReport(\DOMDocument $dom) {
+    protected function principalSearchPropertySetReport($report) {
 
         $httpDepth = $this->server->getHTTPDepth(0);
-        if ($httpDepth!==0) {
+        if ($httpDepth !== 0) {
             throw new DAV\Exception\BadRequest('This report is only defined when Depth: 0');
         }
 
-        if ($dom->firstChild->hasChildNodes())
-            throw new DAV\Exception\BadRequest('The principal-search-property-set report element is not allowed to have child elements');
-
-        $dom = new \DOMDocument('1.0','utf-8');
-        $dom->formatOutput = true;
-        $root = $dom->createElement('d:principal-search-property-set');
-        $dom->appendChild($root);
-        // Adding in default namespaces
-        foreach($this->server->xmlNamespaces as $namespace=>$prefix) {
-
-            $root->setAttribute('xmlns:' . $prefix,$namespace);
-
-        }
+        $writer = $this->server->xml->getWriter();
+        $writer->openMemory();
+        $writer->startDocument();
 
-        $nsList = $this->server->xmlNamespaces;
+        $writer->startElement('{DAV:}principal-search-property-set');
 
-        foreach($this->principalSearchPropertySet as $propertyName=>$description) {
+        foreach ($this->principalSearchPropertySet as $propertyName => $description) {
 
-            $psp = $dom->createElement('d:principal-search-property');
-            $root->appendChild($psp);
+            $writer->startElement('{DAV:}principal-search-property');
+            $writer->startElement('{DAV:}prop');
 
-            $prop = $dom->createElement('d:prop');
-            $psp->appendChild($prop);
+            $writer->writeElement($propertyName);
 
-            $propName = null;
-            preg_match('/^{([^}]*)}(.*)$/',$propertyName,$propName);
+            $writer->endElement(); // prop
 
-            $currentProperty = $dom->createElement($nsList[$propName[1]] . ':' . $propName[2]);
-            $prop->appendChild($currentProperty);
+            if ($description) {
+                $writer->write([[
+                    'name'       => '{DAV:}description',
+                    'value'      => $description,
+                    'attributes' => ['xml:lang' => 'en']
+                ]]);
+            }
 
-            $descriptionElem = $dom->createElement('d:description');
-            $descriptionElem->setAttribute('xml:lang','en');
-            $descriptionElem->appendChild($dom->createTextNode($description));
-            $psp->appendChild($descriptionElem);
+            $writer->endElement(); // principal-search-property
 
 
         }
 
-        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->sendStatus(200);
-        $this->server->httpResponse->sendBody($dom->saveXML());
+        $writer->endElement(); // principal-search-property-set
+
+        $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $this->server->httpResponse->setStatus(200);
+        $this->server->httpResponse->setBody($writer->outputMemory());
 
     }
 
@@ -1307,96 +1241,83 @@ class Plugin extends DAV\ServerPlugin {
      * clients to search for groups of principals, based on the value of one
      * or more properties.
      *
-     * @param \DOMDocument $dom
+     * @param Xml\Request\PrincipalPropertySearchReport $report
      * @return void
      */
-    protected function principalPropertySearchReport(\DOMDocument $dom) {
-
-        list($searchProperties, $requestedProperties, $applyToPrincipalCollectionSet) = $this->parsePrincipalPropertySearchReportRequest($dom);
+    protected function principalPropertySearchReport($report) {
 
         $uri = null;
-        if (!$applyToPrincipalCollectionSet) {
-            $uri = $this->server->getRequestUri();
+        if (!$report->applyToPrincipalCollectionSet) {
+            $uri = $this->server->httpRequest->getPath();
         }
-        $result = $this->principalSearch($searchProperties, $requestedProperties, $uri);
+        if ($this->server->getHttpDepth('0') !== 0) {
+            throw new BadRequest('Depth must be 0');
+        }
+        $result = $this->principalSearch(
+            $report->searchProperties,
+            $report->properties,
+            $uri,
+            $report->test
+        );
 
-        $prefer = $this->server->getHTTPPRefer();
+        $prefer = $this->server->getHTTPPrefer();
 
-        $this->server->httpResponse->sendStatus(207);
-        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
-        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($result, $prefer['return-minimal']));
+        $this->server->httpResponse->setStatus(207);
+        $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
+        $this->server->httpResponse->setHeader('Vary', 'Brief,Prefer');
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($result, $prefer['return'] === 'minimal'));
 
     }
 
+    /* }}} */
+
     /**
-     * parsePrincipalPropertySearchReportRequest
-     *
-     * This method parses the request body from a
-     * {DAV:}principal-property-search report.
-     *
-     * This method returns an array with two elements:
-     *  1. an array with properties to search on, and their values
-     *  2. a list of propertyvalues that should be returned for the request.
+     * This method is used to generate HTML output for the
+     * DAV\Browser\Plugin. This allows us to generate an interface users
+     * can use to create new calendars.
      *
-     * @param \DOMDocument $dom
-     * @return array
+     * @param DAV\INode $node
+     * @param string $output
+     * @return bool
      */
-    protected function parsePrincipalPropertySearchReportRequest($dom) {
-
-        $httpDepth = $this->server->getHTTPDepth(0);
-        if ($httpDepth!==0) {
-            throw new DAV\Exception\BadRequest('This report is only defined when Depth: 0');
-        }
-
-        $searchProperties = array();
-
-        $applyToPrincipalCollectionSet = false;
+    function htmlActionsPanel(DAV\INode $node, &$output) {
 
-        // Parsing the search request
-        foreach($dom->firstChild->childNodes as $searchNode) {
-
-            if (DAV\XMLUtil::toClarkNotation($searchNode) == '{DAV:}apply-to-principal-collection-set') {
-                $applyToPrincipalCollectionSet = true;
-            }
-
-            if (DAV\XMLUtil::toClarkNotation($searchNode)!=='{DAV:}property-search')
-                continue;
-
-            $propertyName = null;
-            $propertyValue = null;
-
-            foreach($searchNode->childNodes as $childNode) {
-
-                switch(DAV\XMLUtil::toClarkNotation($childNode)) {
-
-                    case '{DAV:}prop' :
-                        $property = DAV\XMLUtil::parseProperties($searchNode);
-                        reset($property);
-                        $propertyName = key($property);
-                        break;
-
-                    case '{DAV:}match' :
-                        $propertyValue = $childNode->textContent;
-                        break;
-
-                }
-
-
-            }
-
-            if (is_null($propertyName) || is_null($propertyValue))
-                throw new DAV\Exception\BadRequest('Invalid search request. propertyname: ' . $propertyName . '. propertvvalue: ' . $propertyValue);
-
-            $searchProperties[$propertyName] = $propertyValue;
+        if (!$node instanceof PrincipalCollection)
+            return;
 
-        }
+        $output .= '<tr><td colspan="2"><form method="post" action="">
+            <h3>Create new principal</h3>
+            <input type="hidden" name="sabreAction" value="mkcol" />
+            <input type="hidden" name="resourceType" value="{DAV:}principal" />
+            <label>Name (uri):</label> <input type="text" name="name" /><br />
+            <label>Display name:</label> <input type="text" name="{DAV:}displayname" /><br />
+            <label>Email address:</label> <input type="text" name="{http://sabredav*DOT*org/ns}email-address" /><br />
+            <input type="submit" value="create" />
+            </form>
+            </td></tr>';
 
-        return array($searchProperties, array_keys(DAV\XMLUtil::parseProperties($dom->firstChild)), $applyToPrincipalCollectionSet);
+        return false;
 
     }
 
+    /**
+     * Returns a bunch of meta-data about the plugin.
+     *
+     * Providing this information is optional, and is mainly displayed by the
+     * Browser plugin.
+     *
+     * The description key in the returned array may contain html and will not
+     * be sanitized.
+     *
+     * @return array
+     */
+    function getPluginInfo() {
 
-    /* }}} */
+        return [
+            'name'        => $this->getPluginName(),
+            'description' => 'Adds support for WebDAV ACL (rfc3744)',
+            'link'        => 'http://sabre.io/dav/acl/',
+        ];
 
+    }
 }
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Principal.php b/vendor/sabre/dav/lib/DAVACL/Principal.php
index 89277f850..16375d3fc 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Principal.php
+++ b/vendor/sabre/dav/lib/DAVACL/Principal.php
@@ -3,6 +3,7 @@
 namespace Sabre\DAVACL;
 
 use Sabre\DAV;
+use Sabre\HTTP\URLUtil;
 
 /**
  * Principal class
@@ -15,7 +16,7 @@ use Sabre\DAV;
  * This principal also has basic ACL settings, only allowing the principal
  * access it's own principal.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -41,7 +42,7 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      * @param IPrincipalBackend $principalBackend
      * @param array $principalProperties
      */
-    public function __construct(PrincipalBackend\BackendInterface $principalBackend, array $principalProperties = array()) {
+    function __construct(PrincipalBackend\BackendInterface $principalBackend, array $principalProperties = []) {
 
         if (!isset($principalProperties['uri'])) {
             throw new DAV\Exception('The principal properties must at least contain the \'uri\' key');
@@ -56,7 +57,7 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return string
      */
-    public function getPrincipalUrl() {
+    function getPrincipalUrl() {
 
         return $this->principalProperties['uri'];
 
@@ -69,9 +70,9 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return array
      */
-    public function getAlternateUriSet() {
+    function getAlternateUriSet() {
 
-        $uris = array();
+        $uris = [];
         if (isset($this->principalProperties['{DAV:}alternate-URI-set'])) {
 
             $uris = $this->principalProperties['{DAV:}alternate-URI-set'];
@@ -94,7 +95,7 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return array
      */
-    public function getGroupMemberSet() {
+    function getGroupMemberSet() {
 
         return $this->principalBackend->getGroupMemberSet($this->principalProperties['uri']);
 
@@ -108,13 +109,12 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return array
      */
-    public function getGroupMembership() {
+    function getGroupMembership() {
 
         return $this->principalBackend->getGroupMemberShip($this->principalProperties['uri']);
 
     }
 
-
     /**
      * Sets a list of group members
      *
@@ -126,22 +126,21 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      * @param array $groupMembers
      * @return void
      */
-    public function setGroupMemberSet(array $groupMembers) {
+    function setGroupMemberSet(array $groupMembers) {
 
         $this->principalBackend->setGroupMemberSet($this->principalProperties['uri'], $groupMembers);
 
     }
 
-
     /**
      * Returns this principals name.
      *
      * @return string
      */
-    public function getName() {
+    function getName() {
 
         $uri = $this->principalProperties['uri'];
-        list(, $name) = DAV\URLUtil::splitPath($uri);
+        list(, $name) = URLUtil::splitPath($uri);
         return $name;
 
     }
@@ -151,7 +150,7 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return string
      */
-    public function getDisplayName() {
+    function getDisplayName() {
 
         if (isset($this->principalProperties['{DAV:}displayname'])) {
             return $this->principalProperties['{DAV:}displayname'];
@@ -167,10 +166,10 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      * @param array $requestedProperties
      * @return array
      */
-    public function getProperties($requestedProperties) {
+    function getProperties($requestedProperties) {
 
-        $newProperties = array();
-        foreach($requestedProperties as $propName) {
+        $newProperties = [];
+        foreach ($requestedProperties as $propName) {
 
             if (isset($this->principalProperties[$propName])) {
                 $newProperties[$propName] = $this->principalProperties[$propName];
@@ -183,15 +182,23 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
     }
 
     /**
-     * Updates this principals properties.
-     * 
-     * @param array $mutations
-     * @see Sabre\DAV\IProperties::updateProperties
-     * @return bool|array
+     * Updates properties on this node.
+     *
+     * This method received a PropPatch object, which contains all the
+     * information about the update.
+     *
+     * To update specific properties, call the 'handle' method on this object.
+     * Read the PropPatch documentation for more information.
+     *
+     * @param DAV\PropPatch $propPatch
+     * @return void
      */
-    public function updateProperties($mutations) {
+    function propPatch(DAV\PropPatch $propPatch) {
 
-        return $this->principalBackend->updatePrincipal($this->principalProperties['uri'], $mutations);
+        return $this->principalBackend->updatePrincipal(
+            $this->principalProperties['uri'],
+            $propPatch
+        );
 
     }
 
@@ -202,7 +209,7 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return string|null
      */
-    public function getOwner() {
+    function getOwner() {
 
         return $this->principalProperties['uri'];
 
@@ -216,7 +223,7 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return string|null
      */
-    public function getGroup() {
+    function getGroup() {
 
         return null;
 
@@ -234,15 +241,15 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return array
      */
-    public function getACL() {
+    function getACL() {
 
-        return array(
-            array(
+        return [
+            [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->getPrincipalUrl(),
+                'principal' => '{DAV:}authenticated',
                 'protected' => true,
-            ),
-        );
+            ],
+        ];
 
     }
 
@@ -254,7 +261,7 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      * @param array $acl
      * @return void
      */
-    public function setACL(array $acl) {
+    function setACL(array $acl) {
 
         throw new DAV\Exception\MethodNotAllowed('Updating ACLs is not allowed here');
 
@@ -272,7 +279,7 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return array|null
      */
-    public function getSupportedPrivilegeSet() {
+    function getSupportedPrivilegeSet() {
 
         return null;
 
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php
new file mode 100644
index 000000000..9bf9ba445
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php
@@ -0,0 +1,53 @@
+<?php
+
+namespace Sabre\DAVACL\PrincipalBackend;
+
+/**
+ * Abstract Principal Backend
+ *
+ * Currently this class has no function. It's here for consistency and so we
+ * have a non-bc-breaking way to add a default generic implementation to
+ * functions we may add in the future.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+abstract class AbstractBackend implements BackendInterface {
+
+    /**
+     * Finds a principal by its URI.
+     *
+     * This method may receive any type of uri, but mailto: addresses will be
+     * the most common.
+     *
+     * Implementation of this API is optional. It is currently used by the
+     * CalDAV system to find principals based on their email addresses. If this
+     * API is not implemented, some features may not work correctly.
+     *
+     * This method must return a relative principal path, or null, if the
+     * principal was not found or you refuse to find it.
+     *
+     * @param string $uri
+     * @param string $principalPrefix
+     * @return string
+     */
+    function findByUri($uri, $principalPrefix) {
+
+        // Note that the default implementation here is a bit slow and could
+        // likely be optimized.
+        if (substr($uri, 0, 7) !== 'mailto:') {
+            return;
+        }
+        $result = $this->searchPrincipals(
+            $principalPrefix,
+            ['{http://sabredav.org/ns}email-address' => substr($uri, 7)]
+        );
+
+        if ($result) {
+            return $result[0];
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalBackend/BackendInterface.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
index d0416ac9c..2cb83071a 100644
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalBackend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
@@ -9,7 +9,7 @@ namespace Sabre\DAVACL\PrincipalBackend;
  * implement Sabre\DAVACL\IPrincipal directly. This interface is used solely by
  * Sabre\DAVACL\AbstractPrincipalCollection.
  *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
@@ -46,67 +46,35 @@ interface BackendInterface {
     /**
      * Updates one ore more webdav properties on a principal.
      *
-     * The list of mutations is supplied as an array. Each key in the array is
-     * a propertyname, such as {DAV:}displayname.
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
      *
-     * Each value is the actual value to be updated. If a value is null, it
-     * must be deleted.
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
      *
-     * This method should be atomic. It must either completely succeed, or
-     * completely fail. Success and failure can simply be returned as 'true' or
-     * 'false'.
-     *
-     * It is also possible to return detailed failure information. In that case
-     * an array such as this should be returned:
-     *
-     * array(
-     *   200 => array(
-     *      '{DAV:}prop1' => null,
-     *   ),
-     *   201 => array(
-     *      '{DAV:}prop2' => null,
-     *   ),
-     *   403 => array(
-     *      '{DAV:}prop3' => null,
-     *   ),
-     *   424 => array(
-     *      '{DAV:}prop4' => null,
-     *   ),
-     * );
-     *
-     * In this previous example prop1 was successfully updated or deleted, and
-     * prop2 was succesfully created.
-     *
-     * prop3 failed to update due to '403 Forbidden' and because of this prop4
-     * also could not be updated with '424 Failed dependency'.
-     *
-     * This last example was actually incorrect. While 200 and 201 could appear
-     * in 1 response, if there's any error (403) the other properties should
-     * always fail with 423 (failed dependency).
-     *
-     * But anyway, if you don't want to scratch your head over this, just
-     * return true or false.
+     * Read the PropPatch documenation for more info and examples.
      *
      * @param string $path
-     * @param array $mutations
-     * @return array|bool
+     * @param \Sabre\DAV\PropPatch $propPatch
+     * @return void
      */
-    function updatePrincipal($path, $mutations);
+    function updatePrincipal($path, \Sabre\DAV\PropPatch $propPatch);
 
     /**
      * This method is used to search for principals matching a set of
      * properties.
      *
      * This search is specifically used by RFC3744's principal-property-search
-     * REPORT. You should at least allow searching on
-     * http://sabredav.org/ns}email-address.
+     * REPORT.
      *
      * The actual search should be a unicode-non-case-sensitive search. The
      * keys in searchProperties are the WebDAV property names, while the values
      * are the property values to search on.
      *
-     * If multiple properties are being searched on, the search should be
-     * AND'ed.
+     * By default, if multiple properties are submitted to this method, the
+     * various properties should be combined with 'AND'. If $test is set to
+     * 'anyof', it should be combined using 'OR'.
      *
      * This method should simply return an array with full principal uri's.
      *
@@ -119,9 +87,29 @@ interface BackendInterface {
      *
      * @param string $prefixPath
      * @param array $searchProperties
+     * @param string $test
      * @return array
      */
-    function searchPrincipals($prefixPath, array $searchProperties);
+    function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof');
+
+    /**
+     * Finds a principal by its URI.
+     *
+     * This method may receive any type of uri, but mailto: addresses will be
+     * the most common.
+     *
+     * Implementation of this API is optional. It is currently used by the
+     * CalDAV system to find principals based on their email addresses. If this
+     * API is not implemented, some features may not work correctly.
+     *
+     * This method must return a relative principal path, or null, if the
+     * principal was not found or you refuse to find it.
+     *
+     * @param string $uri
+     * @param string $principalPrefix
+     * @return string
+     */
+    function findByUri($uri, $principalPrefix);
 
     /**
      * Returns the list of members for a group-principal
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/CreatePrincipalSupport.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/CreatePrincipalSupport.php
new file mode 100644
index 000000000..e354a697d
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/CreatePrincipalSupport.php
@@ -0,0 +1,30 @@
+<?php
+
+namespace Sabre\DAVACL\PrincipalBackend;
+
+use Sabre\DAV\MkCol;
+
+/**
+ * Implement this interface to add support for creating new principals to your
+ * principal backend.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+interface CreatePrincipalSupport extends BackendInterface {
+
+    /**
+     * Creates a new principal.
+     *
+     * This method receives a full path for the new principal. The mkCol object
+     * contains any additional webdav properties specified during the creation
+     * of the principal.
+     *
+     * @param string $path
+     * @param MkCol $mkCol
+     * @return void
+     */
+    function createPrincipal($path, MkCol $mkCol);
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/PDO.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/PDO.php
new file mode 100644
index 000000000..01b7a175c
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/PDO.php
@@ -0,0 +1,431 @@
+<?php
+
+namespace Sabre\DAVACL\PrincipalBackend;
+
+use Sabre\DAV;
+use Sabre\DAV\MkCol;
+use Sabre\HTTP\URLUtil;
+
+/**
+ * PDO principal backend
+ *
+ *
+ * This backend assumes all principals are in a single collection. The default collection
+ * is 'principals/', but this can be overriden.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PDO extends AbstractBackend implements CreatePrincipalSupport {
+
+    /**
+     * PDO table name for 'principals'
+     *
+     * @var string
+     */
+    public $tableName = 'principals';
+
+    /**
+     * PDO table name for 'group members'
+     *
+     * @var string
+     */
+    public $groupMembersTableName = 'groupmembers';
+
+    /**
+     * pdo
+     *
+     * @var PDO
+     */
+    protected $pdo;
+
+    /**
+     * A list of additional fields to support
+     *
+     * @var array
+     */
+    protected $fieldMap = [
+
+        /**
+         * This property can be used to display the users' real name.
+         */
+        '{DAV:}displayname' => [
+            'dbField' => 'displayname',
+        ],
+
+        /**
+         * This is the users' primary email-address.
+         */
+        '{http://sabredav.org/ns}email-address' => [
+            'dbField' => 'email',
+        ],
+    ];
+
+    /**
+     * Sets up the backend.
+     *
+     * @param PDO $pdo
+     */
+    function __construct(\PDO $pdo) {
+
+        $this->pdo = $pdo;
+
+    }
+
+    /**
+     * Returns a list of principals based on a prefix.
+     *
+     * This prefix will often contain something like 'principals'. You are only
+     * expected to return principals that are in this base path.
+     *
+     * You are expected to return at least a 'uri' for every user, you can
+     * return any additional properties if you wish so. Common properties are:
+     *   {DAV:}displayname
+     *   {http://sabredav.org/ns}email-address - This is a custom SabreDAV
+     *     field that's actualy injected in a number of other properties. If
+     *     you have an email address, use this property.
+     *
+     * @param string $prefixPath
+     * @return array
+     */
+    function getPrincipalsByPrefix($prefixPath) {
+
+        $fields = [
+            'uri',
+        ];
+
+        foreach ($this->fieldMap as $key => $value) {
+            $fields[] = $value['dbField'];
+        }
+        $result = $this->pdo->query('SELECT ' . implode(',', $fields) . '  FROM ' . $this->tableName);
+
+        $principals = [];
+
+        while ($row = $result->fetch(\PDO::FETCH_ASSOC)) {
+
+            // Checking if the principal is in the prefix
+            list($rowPrefix) = URLUtil::splitPath($row['uri']);
+            if ($rowPrefix !== $prefixPath) continue;
+
+            $principal = [
+                'uri' => $row['uri'],
+            ];
+            foreach ($this->fieldMap as $key => $value) {
+                if ($row[$value['dbField']]) {
+                    $principal[$key] = $row[$value['dbField']];
+                }
+            }
+            $principals[] = $principal;
+
+        }
+
+        return $principals;
+
+    }
+
+    /**
+     * Returns a specific principal, specified by it's path.
+     * The returned structure should be the exact same as from
+     * getPrincipalsByPrefix.
+     *
+     * @param string $path
+     * @return array
+     */
+    function getPrincipalByPath($path) {
+
+        $fields = [
+            'id',
+            'uri',
+        ];
+
+        foreach ($this->fieldMap as $key => $value) {
+            $fields[] = $value['dbField'];
+        }
+        $stmt = $this->pdo->prepare('SELECT ' . implode(',', $fields) . '  FROM ' . $this->tableName . ' WHERE uri = ?');
+        $stmt->execute([$path]);
+
+        $row = $stmt->fetch(\PDO::FETCH_ASSOC);
+        if (!$row) return;
+
+        $principal = [
+            'id'  => $row['id'],
+            'uri' => $row['uri'],
+        ];
+        foreach ($this->fieldMap as $key => $value) {
+            if ($row[$value['dbField']]) {
+                $principal[$key] = $row[$value['dbField']];
+            }
+        }
+        return $principal;
+
+    }
+
+    /**
+     * Updates one ore more webdav properties on a principal.
+     *
+     * The list of mutations is stored in a Sabre\DAV\PropPatch object.
+     * To do the actual updates, you must tell this object which properties
+     * you're going to process with the handle() method.
+     *
+     * Calling the handle method is like telling the PropPatch object "I
+     * promise I can handle updating this property".
+     *
+     * Read the PropPatch documenation for more info and examples.
+     *
+     * @param string $path
+     * @param DAV\PropPatch $propPatch
+     */
+    function updatePrincipal($path, DAV\PropPatch $propPatch) {
+
+        $propPatch->handle(array_keys($this->fieldMap), function($properties) use ($path) {
+
+            $query = "UPDATE " . $this->tableName . " SET ";
+            $first = true;
+
+            $values = [];
+
+            foreach ($properties as $key => $value) {
+
+                $dbField = $this->fieldMap[$key]['dbField'];
+
+                if (!$first) {
+                    $query .= ', ';
+                }
+                $first = false;
+                $query .= $dbField . ' = :' . $dbField;
+                $values[$dbField] = $value;
+
+            }
+
+            $query .= " WHERE uri = :uri";
+            $values['uri'] = $path;
+
+            $stmt = $this->pdo->prepare($query);
+            $stmt->execute($values);
+
+            return true;
+
+        });
+
+    }
+
+    /**
+     * This method is used to search for principals matching a set of
+     * properties.
+     *
+     * This search is specifically used by RFC3744's principal-property-search
+     * REPORT.
+     *
+     * The actual search should be a unicode-non-case-sensitive search. The
+     * keys in searchProperties are the WebDAV property names, while the values
+     * are the property values to search on.
+     *
+     * By default, if multiple properties are submitted to this method, the
+     * various properties should be combined with 'AND'. If $test is set to
+     * 'anyof', it should be combined using 'OR'.
+     *
+     * This method should simply return an array with full principal uri's.
+     *
+     * If somebody attempted to search on a property the backend does not
+     * support, you should simply return 0 results.
+     *
+     * You can also just return 0 results if you choose to not support
+     * searching at all, but keep in mind that this may stop certain features
+     * from working.
+     *
+     * @param string $prefixPath
+     * @param array $searchProperties
+     * @param string $test
+     * @return array
+     */
+    function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof') {
+        if (count($searchProperties) == 0) return [];    //No criteria
+
+        $query = 'SELECT uri FROM ' . $this->tableName . ' WHERE ';
+        $values = [];
+        foreach ($searchProperties as $property => $value) {
+            switch ($property) {
+                case '{DAV:}displayname' :
+                    $column = "displayname";
+                    break;
+                case '{http://sabredav.org/ns}email-address' :
+                    $column = "email";
+                    break;
+                default :
+                    // Unsupported property
+                    return [];
+            }
+            if (count($values) > 0) $query .= (strcmp($test, "anyof") == 0 ? " OR " : " AND ");
+            $query .= 'lower(' . $column . ') LIKE lower(?)';
+            $values[] = '%' . $value . '%';
+
+        }
+        $stmt = $this->pdo->prepare($query);
+        $stmt->execute($values);
+
+        $principals = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+
+            // Checking if the principal is in the prefix
+            list($rowPrefix) = URLUtil::splitPath($row['uri']);
+            if ($rowPrefix !== $prefixPath) continue;
+
+            $principals[] = $row['uri'];
+
+        }
+
+        return $principals;
+
+    }
+
+    /**
+     * Finds a principal by its URI.
+     *
+     * This method may receive any type of uri, but mailto: addresses will be
+     * the most common.
+     *
+     * Implementation of this API is optional. It is currently used by the
+     * CalDAV system to find principals based on their email addresses. If this
+     * API is not implemented, some features may not work correctly.
+     *
+     * This method must return a relative principal path, or null, if the
+     * principal was not found or you refuse to find it.
+     *
+     * @param string $uri
+     * @param string $principalPrefix
+     * @return string
+     */
+    function findByUri($uri, $principalPrefix) {
+        $value = null;
+        $scheme = null;
+        list($scheme, $value) = explode(":", $uri, 2);
+        if ($value == null) return null;
+
+        $uri = null;
+        switch ($scheme){
+            case "mailto":
+                $query = 'SELECT uri FROM ' . $this->tableName . ' WHERE lower(email)=lower(?)';
+                $stmt = $this->pdo->prepare($query);
+                $stmt->execute([ $value ]);
+            
+                while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+                    // Checking if the principal is in the prefix
+                    list($rowPrefix) = URLUtil::splitPath($row['uri']);
+                    if ($rowPrefix !== $principalPrefix) continue;
+                    
+                    $uri = $row['uri'];
+                    break; //Stop on first match
+                }
+                break;
+            default:
+                //unsupported uri scheme
+                return null;
+        }
+        return $uri;
+    }
+
+    /**
+     * Returns the list of members for a group-principal
+     *
+     * @param string $principal
+     * @return array
+     */
+    function getGroupMemberSet($principal) {
+
+        $principal = $this->getPrincipalByPath($principal);
+        if (!$principal) throw new DAV\Exception('Principal not found');
+
+        $stmt = $this->pdo->prepare('SELECT principals.uri as uri FROM ' . $this->groupMembersTableName . ' AS groupmembers LEFT JOIN ' . $this->tableName . ' AS principals ON groupmembers.member_id = principals.id WHERE groupmembers.principal_id = ?');
+        $stmt->execute([$principal['id']]);
+
+        $result = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            $result[] = $row['uri'];
+        }
+        return $result;
+
+    }
+
+    /**
+     * Returns the list of groups a principal is a member of
+     *
+     * @param string $principal
+     * @return array
+     */
+    function getGroupMembership($principal) {
+
+        $principal = $this->getPrincipalByPath($principal);
+        if (!$principal) throw new DAV\Exception('Principal not found');
+
+        $stmt = $this->pdo->prepare('SELECT principals.uri as uri FROM ' . $this->groupMembersTableName . ' AS groupmembers LEFT JOIN ' . $this->tableName . ' AS principals ON groupmembers.principal_id = principals.id WHERE groupmembers.member_id = ?');
+        $stmt->execute([$principal['id']]);
+
+        $result = [];
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            $result[] = $row['uri'];
+        }
+        return $result;
+
+    }
+
+    /**
+     * Updates the list of group members for a group principal.
+     *
+     * The principals should be passed as a list of uri's.
+     *
+     * @param string $principal
+     * @param array $members
+     * @return void
+     */
+    function setGroupMemberSet($principal, array $members) {
+
+        // Grabbing the list of principal id's.
+        $stmt = $this->pdo->prepare('SELECT id, uri FROM ' . $this->tableName . ' WHERE uri IN (? ' . str_repeat(', ? ', count($members)) . ');');
+        $stmt->execute(array_merge([$principal], $members));
+
+        $memberIds = [];
+        $principalId = null;
+
+        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
+            if ($row['uri'] == $principal) {
+                $principalId = $row['id'];
+            } else {
+                $memberIds[] = $row['id'];
+            }
+        }
+        if (!$principalId) throw new DAV\Exception('Principal not found');
+
+        // Wiping out old members
+        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->groupMembersTableName . ' WHERE principal_id = ?;');
+        $stmt->execute([$principalId]);
+
+        foreach ($memberIds as $memberId) {
+
+            $stmt = $this->pdo->prepare('INSERT INTO ' . $this->groupMembersTableName . ' (principal_id, member_id) VALUES (?, ?);');
+            $stmt->execute([$principalId, $memberId]);
+
+        }
+
+    }
+
+    /**
+     * Creates a new principal.
+     *
+     * This method receives a full path for the new principal. The mkCol object
+     * contains any additional webdav properties specified during the creation
+     * of the principal.
+     *
+     * @param string $path
+     * @param MkCol $mkCol
+     * @return void
+     */
+    function createPrincipal($path, MkCol $mkCol) {
+
+        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->tableName . ' (uri) VALUES (?)');
+        $stmt->execute([$path]);
+        $this->updatePrincipal($path, $mkCol);
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalCollection.php b/vendor/sabre/dav/lib/DAVACL/PrincipalCollection.php
new file mode 100644
index 000000000..54911e7b5
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalCollection.php
@@ -0,0 +1,151 @@
+<?php
+
+namespace Sabre\DAVACL;
+
+use Sabre\DAV\Exception\InvalidResourceType;
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\IExtendedCollection;
+use Sabre\DAV\MkCol;
+
+/**
+ * Principals Collection
+ *
+ * This collection represents a list of users.
+ * The users are instances of Sabre\DAVACL\Principal
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PrincipalCollection extends AbstractPrincipalCollection implements IExtendedCollection, IACL {
+
+    /**
+     * This method returns a node for a principal.
+     *
+     * The passed array contains principal information, and is guaranteed to
+     * at least contain a uri item. Other properties may or may not be
+     * supplied by the authentication backend.
+     *
+     * @param array $principal
+     * @return \Sabre\DAV\INode
+     */
+    function getChildForPrincipal(array $principal) {
+
+        return new Principal($this->principalBackend, $principal);
+
+    }
+
+    /**
+     * Creates a new collection.
+     *
+     * This method will receive a MkCol object with all the information about
+     * the new collection that's being created.
+     *
+     * The MkCol object contains information about the resourceType of the new
+     * collection. If you don't support the specified resourceType, you should
+     * throw Exception\InvalidResourceType.
+     *
+     * The object also contains a list of WebDAV properties for the new
+     * collection.
+     *
+     * You should call the handle() method on this object to specify exactly
+     * which properties you are storing. This allows the system to figure out
+     * exactly which properties you didn't store, which in turn allows other
+     * plugins (such as the propertystorage plugin) to handle storing the
+     * property for you.
+     *
+     * @param string $name
+     * @param MkCol $mkCol
+     * @throws Exception\InvalidResourceType
+     * @return void
+     */
+    function createExtendedCollection($name, MkCol $mkCol) {
+
+        if (!$mkCol->hasResourceType('{DAV:}principal')) {
+            throw new InvalidResourceType('Only resources of type {DAV:}principal may be created here');
+        }
+
+        $this->principalBackend->createPrincipal(
+            $this->principalPrefix . '/' . $name,
+            $mkCol
+        );
+
+    }
+
+    /**
+     * Returns the owner principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getOwner() {
+        return null;
+    }
+
+    /**
+     * Returns a group principal
+     *
+     * This must be a url to a principal, or null if there's no owner
+     *
+     * @return string|null
+     */
+    function getGroup() {
+        return null;
+    }
+
+    /**
+     * Returns a list of ACE's for this node.
+     *
+     * Each ACE has the following properties:
+     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
+     *     currently the only supported privileges
+     *   * 'principal', a url to the principal who owns the node
+     *   * 'protected' (optional), indicating that this ACE is not allowed to
+     *      be updated.
+     *
+     * @return array
+     */
+    function getACL() {
+        return [
+            [
+                'principal' => '{DAV:}authenticated',
+                'privilege' => '{DAV:}read',
+                'protected' => true,
+            ],
+        ];
+    }
+
+    /**
+     * Updates the ACL
+     *
+     * This method will receive a list of new ACE's as an array argument.
+     *
+     * @param array $acl
+     * @return void
+     */
+    function setACL(array $acl) {
+
+        throw new Forbidden('Updating ACLs is not allowed on this node');
+
+    }
+
+    /**
+     * Returns the list of supported privileges for this node.
+     *
+     * The returned data structure is a list of nested privileges.
+     * See Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
+     * standard structure.
+     *
+     * If null is returned from this method, the default privilege set is used,
+     * which is fine for most common usecases.
+     *
+     * @return array|null
+     */
+    function getSupportedPrivilegeSet() {
+
+        return null;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Property/Acl.php b/vendor/sabre/dav/lib/DAVACL/Xml/Property/Acl.php
new file mode 100644
index 000000000..9f5e40df1
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/Acl.php
@@ -0,0 +1,277 @@
+<?php
+
+namespace Sabre\DAVACL\Xml\Property;
+
+use Sabre\DAV;
+use Sabre\DAV\Browser\HtmlOutput;
+use Sabre\DAV\Browser\HtmlOutputHelper;
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+
+/**
+ * This class represents the {DAV:}acl property.
+ *
+ * The {DAV:}acl property is a full list of access control entries for a
+ * resource.
+ *
+ * {DAV:}acl is used as a WebDAV property, but it is also used within the body
+ * of the ACL request.
+ *
+ * See:
+ * http://tools.ietf.org/html/rfc3744#section-5.5
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Acl implements Element, HtmlOutput {
+
+    /**
+     * List of privileges
+     *
+     * @var array
+     */
+    protected $privileges;
+
+    /**
+     * Whether or not the server base url is required to be prefixed when
+     * serializing the property.
+     *
+     * @var bool
+     */
+    protected $prefixBaseUrl;
+
+    /**
+     * Constructor
+     *
+     * This object requires a structure similar to the return value from
+     * Sabre\DAVACL\Plugin::getACL().
+     *
+     * Each privilege is a an array with at least a 'privilege' property, and a
+     * 'principal' property. A privilege may have a 'protected' property as
+     * well.
+     *
+     * The prefixBaseUrl should be set to false, if the supplied principal urls
+     * are already full urls. If this is kept to true, the servers base url
+     * will automatically be prefixed.
+     *
+     * @param array $privileges
+     * @param bool $prefixBaseUrl
+     */
+    function __construct(array $privileges, $prefixBaseUrl = true) {
+
+        $this->privileges = $privileges;
+        $this->prefixBaseUrl = $prefixBaseUrl;
+
+    }
+
+    /**
+     * Returns the list of privileges for this property
+     *
+     * @return array
+     */
+    function getPrivileges() {
+
+        return $this->privileges;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->privileges as $ace) {
+
+            $this->serializeAce($writer, $ace);
+
+        }
+
+    }
+
+    /**
+     * Generate html representation for this value.
+     *
+     * The html output is 100% trusted, and no effort is being made to sanitize
+     * it. It's up to the implementor to sanitize user provided values.
+     *
+     * The output must be in UTF-8.
+     *
+     * The baseUri parameter is a url to the root of the application, and can
+     * be used to construct local links.
+     *
+     * @param HtmlOutputHelper $html
+     * @return string
+     */
+    function toHtml(HtmlOutputHelper $html) {
+
+        ob_start();
+        echo "<table>";
+        echo "<tr><th>Principal</th><th>Privilege</th><th></th></tr>";
+        foreach ($this->privileges as $privilege) {
+
+            echo '<tr>';
+            // if it starts with a {, it's a special principal
+            if ($privilege['principal'][0] === '{') {
+                echo '<td>', $html->xmlName($privilege['principal']), '</td>';
+            } else {
+                echo '<td>', $html->link($privilege['principal']), '</td>';
+            }
+            echo '<td>', $html->xmlName($privilege['privilege']), '</td>';
+            echo '<td>';
+            if (!empty($privilege['protected'])) echo '(protected)';
+            echo '</td>';
+            echo '</tr>';
+
+        }
+        echo "</table>";
+        return ob_get_clean();
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * Important note 2: You are responsible for advancing the reader to the
+     * next element. Not doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elementMap = [
+            '{DAV:}ace'       => 'Sabre\Xml\Element\KeyValue',
+            '{DAV:}privilege' => 'Sabre\Xml\Element\Elements',
+            '{DAV:}principal' => 'Sabre\DAVACL\Xml\Property\Principal',
+        ];
+
+        $privileges = [];
+
+        foreach ((array)$reader->parseInnerTree($elementMap) as $element) {
+
+            if ($element['name'] !== '{DAV:}ace') {
+                continue;
+            }
+            $ace = $element['value'];
+
+            if (empty($ace['{DAV:}principal'])) {
+                throw new DAV\Exception\BadRequest('Each {DAV:}ace element must have one {DAV:}principal element');
+            }
+            $principal = $ace['{DAV:}principal'];
+
+            switch ($principal->getType()) {
+                case Principal::HREF :
+                    $principal = $principal->getHref();
+                    break;
+                case Principal::AUTHENTICATED :
+                    $principal = '{DAV:}authenticated';
+                    break;
+                case Principal::UNAUTHENTICATED :
+                    $principal = '{DAV:}unauthenticated';
+                    break;
+                case Principal::ALL :
+                    $principal = '{DAV:}all';
+                    break;
+
+            }
+
+            $protected = array_key_exists('{DAV:}protected', $ace);
+
+            if (!isset($ace['{DAV:}grant'])) {
+                throw new DAV\Exception\NotImplemented('Every {DAV:}ace element must have a {DAV:}grant element. {DAV:}deny is not yet supported');
+            }
+            foreach ($ace['{DAV:}grant'] as $elem) {
+                if ($elem['name'] !== '{DAV:}privilege') {
+                    continue;
+                }
+
+                foreach ($elem['value'] as $priv) {
+                    $privileges[] = [
+                        'principal' => $principal,
+                        'protected' => $protected,
+                        'privilege' => $priv,
+                    ];
+                }
+
+            }
+
+        }
+
+        return new self($privileges);
+
+    }
+
+    /**
+     * Serializes a single access control entry.
+     *
+     * @param Writer $writer
+     * @param array $ace
+     * @return void
+     */
+    private function serializeAce(Writer $writer, array $ace) {
+
+        $writer->startElement('{DAV:}ace');
+
+        switch ($ace['principal']) {
+            case '{DAV:}authenticated' :
+                $principal = new Principal(Principal::AUTHENTICATED);
+                break;
+            case '{DAV:}unauthenticated' :
+                $principal = new Principal(Principal::UNAUTHENTICATED);
+                break;
+            case '{DAV:}all' :
+                $principal = new Principal(Principal::ALL);
+                break;
+            default:
+                $principal = new Principal(Principal::HREF, $ace['principal']);
+                break;
+        }
+
+        $writer->writeElement('{DAV:}principal', $principal);
+        $writer->startElement('{DAV:}grant');
+        $writer->startElement('{DAV:}privilege');
+
+        $writer->writeElement($ace['privilege']);
+
+        $writer->endElement(); // privilege
+        $writer->endElement(); // grant
+
+        if (!empty($ace['protected'])) {
+            $writer->writeElement('{DAV:}protected');
+        }
+
+        $writer->endElement(); // ace
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Property/AclRestrictions.php b/vendor/sabre/dav/lib/DAVACL/Xml/Property/AclRestrictions.php
new file mode 100644
index 000000000..f669cc5e1
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/AclRestrictions.php
@@ -0,0 +1,45 @@
+<?php
+
+namespace Sabre\DAVACL\Xml\Property;
+
+use Sabre\Xml\XmlSerializable;
+use Sabre\Xml\Writer;
+
+/**
+ * AclRestrictions property
+ *
+ * This property represents {DAV:}acl-restrictions, as defined in RFC3744.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class AclRestrictions implements XmlSerializable {
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $writer->writeElement('{DAV:}grant-only');
+        $writer->writeElement('{DAV:}no-invert');
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Property/CurrentUserPrivilegeSet.php b/vendor/sabre/dav/lib/DAVACL/Xml/Property/CurrentUserPrivilegeSet.php
new file mode 100644
index 000000000..0a95eb2b7
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/CurrentUserPrivilegeSet.php
@@ -0,0 +1,159 @@
+<?php
+
+namespace Sabre\DAVACL\Xml\Property;
+
+use Sabre\DAV\Browser\HtmlOutput;
+use Sabre\DAV\Browser\HtmlOutputHelper;
+use Sabre\Xml\Element;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+
+/**
+ * CurrentUserPrivilegeSet
+ *
+ * This class represents the current-user-privilege-set property. When
+ * requested, it contain all the privileges a user has on a specific node.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class CurrentUserPrivilegeSet implements Element, HtmlOutput {
+
+    /**
+     * List of privileges
+     *
+     * @var array
+     */
+    private $privileges;
+
+    /**
+     * Creates the object
+     *
+     * Pass the privileges in clark-notation
+     *
+     * @param array $privileges
+     */
+    function __construct(array $privileges) {
+
+        $this->privileges = $privileges;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        foreach ($this->privileges as $privName) {
+
+            $writer->startElement('{DAV:}privilege');
+            $writer->writeElement($privName);
+            $writer->endElement();
+
+        }
+
+
+    }
+
+    /**
+     * Returns true or false, whether the specified principal appears in the
+     * list.
+     *
+     * @param string $privilegeName
+     * @return bool
+     */
+    function has($privilegeName) {
+
+        return in_array($privilegeName, $this->privileges);
+
+    }
+
+    /**
+     * Returns the list of privileges.
+     *
+     * @return array
+     */
+    function getValue() {
+
+        return $this->privileges;
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $result = [];
+
+        $tree = $reader->parseInnerTree(['{DAV:}privilege' => 'Sabre\\Xml\\Element\\Elements']);
+        foreach ($tree as $element) {
+            if ($element['name'] !== '{DAV:}privilege') {
+                continue;
+            }
+            $result[] = $element['value'][0];
+        }
+        return new self($result);
+
+    }
+
+    /**
+     * Generate html representation for this value.
+     *
+     * The html output is 100% trusted, and no effort is being made to sanitize
+     * it. It's up to the implementor to sanitize user provided values.
+     *
+     * The output must be in UTF-8.
+     *
+     * The baseUri parameter is a url to the root of the application, and can
+     * be used to construct local links.
+     *
+     * @param HtmlOutputHelper $html
+     * @return string
+     */
+    function toHtml(HtmlOutputHelper $html) {
+
+        return implode(
+            ', ',
+            array_map([$html, 'xmlName'], $this->getValue())
+        );
+
+    }
+
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Property/Principal.php b/vendor/sabre/dav/lib/DAVACL/Xml/Property/Principal.php
new file mode 100644
index 000000000..d32249d8b
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/Principal.php
@@ -0,0 +1,196 @@
+<?php
+
+namespace Sabre\DAVACL\Xml\Property;
+
+use Sabre\DAV;
+use Sabre\DAV\Browser\HtmlOutputHelper;
+use Sabre\DAV\Exception\BadRequest;
+use Sabre\Xml\Reader;
+use Sabre\Xml\Writer;
+
+/**
+ * Principal property
+ *
+ * The principal property represents a principal from RFC3744 (ACL).
+ * The property can be used to specify a principal or pseudo principals.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class Principal extends DAV\Xml\Property\Href {
+
+    /**
+     * To specify a not-logged-in user, use the UNAUTHENTICATED principal
+     */
+    const UNAUTHENTICATED = 1;
+
+    /**
+     * To specify any principal that is logged in, use AUTHENTICATED
+     */
+    const AUTHENTICATED = 2;
+
+    /**
+     * Specific principals can be specified with the HREF
+     */
+    const HREF = 3;
+
+    /**
+     * Everybody, basically
+     */
+    const ALL = 4;
+
+    /**
+     * Principal-type
+     *
+     * Must be one of the UNAUTHENTICATED, AUTHENTICATED or HREF constants.
+     *
+     * @var int
+     */
+    protected $type;
+
+    /**
+     * Creates the property.
+     *
+     * The 'type' argument must be one of the type constants defined in this class.
+     *
+     * 'href' is only required for the HREF type.
+     *
+     * @param int $type
+     * @param string|null $href
+     */
+    function __construct($type, $href = null) {
+
+        $this->type = $type;
+        if ($type === self::HREF && is_null($href)) {
+            throw new DAV\Exception('The href argument must be specified for the HREF principal type.');
+        }
+        if ($href) {
+            $href = rtrim($href, '/') . '/';
+            parent::__construct($href);
+        }
+
+    }
+
+    /**
+     * Returns the principal type
+     *
+     * @return int
+     */
+    function getType() {
+
+        return $this->type;
+
+    }
+
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        switch ($this->type) {
+
+            case self::UNAUTHENTICATED :
+                $writer->writeElement('{DAV:}unauthenticated');
+                break;
+            case self::AUTHENTICATED :
+                $writer->writeElement('{DAV:}authenticated');
+                break;
+            case self::HREF :
+                parent::xmlSerialize($writer);
+                break;
+            case self::ALL :
+                $writer->writeElement('{DAV:}all');
+                break;
+        }
+
+    }
+
+    /**
+     * Generate html representation for this value.
+     *
+     * The html output is 100% trusted, and no effort is being made to sanitize
+     * it. It's up to the implementor to sanitize user provided values.
+     *
+     * The output must be in UTF-8.
+     *
+     * The baseUri parameter is a url to the root of the application, and can
+     * be used to construct local links.
+     *
+     * @param HtmlOutputHelper $html
+     * @return string
+     */
+    function toHtml(HtmlOutputHelper $html) {
+
+        switch ($this->type) {
+
+            case self::UNAUTHENTICATED :
+                return '<em>unauthenticated</em>';
+            case self::AUTHENTICATED :
+                return '<em>authenticated</em>';
+            case self::HREF :
+                return parent::toHtml($html);
+            case self::ALL :
+                return '<em>all</em>';
+        }
+
+    }
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called staticly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * Important note 2: You are responsible for advancing the reader to the
+     * next element. Not doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $tree = $reader->parseInnerTree()[0];
+
+        switch ($tree['name']) {
+            case '{DAV:}unauthenticated' :
+                return new self(self::UNAUTHENTICATED);
+            case '{DAV:}authenticated' :
+                return new self(self::AUTHENTICATED);
+            case '{DAV:}href':
+                return new self(self::HREF, $tree['value']);
+            case '{DAV:}all':
+                return new self(self::ALL);
+            default :
+                throw new BadRequest('Unknown or unsupported principal type: ' . $tree['name']);
+        }
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Property/SupportedPrivilegeSet.php b/vendor/sabre/dav/lib/DAVACL/Xml/Property/SupportedPrivilegeSet.php
new file mode 100644
index 000000000..572bed4dd
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/SupportedPrivilegeSet.php
@@ -0,0 +1,159 @@
+<?php
+
+namespace Sabre\DAVACL\Xml\Property;
+
+use Sabre\DAV\Browser\HtmlOutput;
+use Sabre\DAV\Browser\HtmlOutputHelper;
+use Sabre\Xml\XmlSerializable;
+use Sabre\Xml\Writer;
+
+/**
+ * SupportedPrivilegeSet property
+ *
+ * This property encodes the {DAV:}supported-privilege-set property, as defined
+ * in rfc3744. Please consult the rfc for details about it's structure.
+ *
+ * This class expects a structure like the one given from
+ * Sabre\DAVACL\Plugin::getSupportedPrivilegeSet as the argument in its
+ * constructor.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class SupportedPrivilegeSet implements XmlSerializable, HtmlOutput {
+
+    /**
+     * privileges
+     *
+     * @var array
+     */
+    protected $privileges;
+
+    /**
+     * Constructor
+     *
+     * @param array $privileges
+     */
+    function __construct(array $privileges) {
+
+        $this->privileges = $privileges;
+
+    }
+
+    /**
+     * Returns the privilege value.
+     *
+     * @return array
+     */
+    function getValue() {
+
+        return $this->privileges;
+
+    }
+
+    /**
+     * The xmlSerialize metod is called during xml writing.
+     *
+     * Use the $writer argument to write its own xml serialization.
+     *
+     * An important note: do _not_ create a parent element. Any element
+     * implementing XmlSerializble should only ever write what's considered
+     * its 'inner xml'.
+     *
+     * The parent of the current element is responsible for writing a
+     * containing element.
+     *
+     * This allows serializers to be re-used for different element names.
+     *
+     * If you are opening new elements, you must also close them again.
+     *
+     * @param Writer $writer
+     * @return void
+     */
+    function xmlSerialize(Writer $writer) {
+
+        $this->serializePriv($writer, $this->privileges);
+
+    }
+
+    /**
+     * Generate html representation for this value.
+     *
+     * The html output is 100% trusted, and no effort is being made to sanitize
+     * it. It's up to the implementor to sanitize user provided values.
+     *
+     * The output must be in UTF-8.
+     *
+     * The baseUri parameter is a url to the root of the application, and can
+     * be used to construct local links.
+     *
+     * @param HtmlOutputHelper $html
+     * @return string
+     */
+    function toHtml(HtmlOutputHelper $html) {
+
+        $traverse = function($priv) use (&$traverse, $html) {
+            echo "<li>";
+            echo $html->xmlName($priv['privilege']);
+            if (isset($priv['abstract']) && $priv['abstract']) {
+                echo " <i>(abstract)</i>";
+            }
+            if (isset($priv['description'])) {
+                echo " " . $html->h($priv['description']);
+            }
+            if (isset($priv['aggregates'])) {
+                echo "\n<ul>\n";
+                foreach ($priv['aggregates'] as $subPriv) {
+                    $traverse($subPriv);
+                }
+                echo "</ul>";
+            }
+            echo "</li>\n";
+        };
+
+        ob_start();
+        echo "<ul class=\"tree\">";
+        $traverse($this->getValue());
+        echo "</ul>\n";
+
+        return ob_get_clean();
+
+    }
+
+
+
+    /**
+     * Serializes a property
+     *
+     * This is a recursive function.
+     *
+     * @param Writer $writer
+     * @param array $privilege
+     * @return void
+     */
+    private function serializePriv(Writer $writer, $privilege) {
+
+        $writer->startElement('{DAV:}supported-privilege');
+
+        $writer->startElement('{DAV:}privilege');
+        $writer->writeElement($privilege['privilege']);
+        $writer->endElement(); // privilege
+
+        if (!empty($privilege['abstract'])) {
+            $writer->writeElement('{DAV:}abstract');
+        }
+        if (!empty($privilege['description'])) {
+            $writer->writeElement('{DAV:}description', $privilege['description']);
+        }
+        if (isset($privilege['aggregates'])) {
+            foreach ($privilege['aggregates'] as $subPrivilege) {
+                $this->serializePriv($writer, $subPrivilege);
+            }
+        }
+
+        $writer->endElement(); // supported-privilege
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Request/ExpandPropertyReport.php b/vendor/sabre/dav/lib/DAVACL/Xml/Request/ExpandPropertyReport.php
new file mode 100644
index 000000000..3f535e301
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Request/ExpandPropertyReport.php
@@ -0,0 +1,103 @@
+<?php
+
+namespace Sabre\DAVACL\Xml\Request;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+
+/**
+ * ExpandProperty request parser.
+ *
+ * This class parses the {DAV:}expand-property REPORT, as defined in:
+ *
+ * http://tools.ietf.org/html/rfc3253#section-3.8
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class ExpandPropertyReport implements XmlDeserializable {
+
+    /**
+     * An array with requested properties.
+     *
+     * The requested properties will be used as keys in this array. The value
+     * is normally null.
+     *
+     * If the value is an array though, it means the property must be expanded.
+     * Within the array, the sub-properties, which themselves may be null or
+     * arrays.
+     *
+     * @var array
+     */
+    public $properties;
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $elems = $reader->parseInnerTree();
+
+        $obj = new self();
+        $obj->properties = self::traverse($elems);
+
+        return $obj;
+
+    }
+
+    /**
+     * This method is used by deserializeXml, to recursively parse the
+     * {DAV:}property elements.
+     *
+     * @param array $elems
+     * @return void
+     */
+    private static function traverse($elems) {
+
+        $result = [];
+
+        foreach ($elems as $elem) {
+
+            if ($elem['name'] !== '{DAV:}property') {
+                continue;
+            }
+
+            $namespace = isset($elem['attributes']['namespace']) ?
+                $elem['attributes']['namespace'] :
+                'DAV:';
+
+            $propName = '{' . $namespace . '}' . $elem['attributes']['name'];
+
+            $value = null;
+            if (is_array($elem['value'])) {
+                $value = self::traverse($elem['value']);
+            }
+
+            $result[$propName] = $value;
+
+        }
+
+        return $result;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalPropertySearchReport.php b/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalPropertySearchReport.php
new file mode 100644
index 000000000..1e7aa4481
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalPropertySearchReport.php
@@ -0,0 +1,127 @@
+<?php
+
+namespace Sabre\DAVACL\Xml\Request;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\DAV\Exception\BadRequest;
+
+/**
+ * PrincipalSearchPropertySetReport request parser.
+ *
+ * This class parses the {DAV:}principal-property-search REPORT, as defined
+ * in:
+ *
+ * https://tools.ietf.org/html/rfc3744#section-9.4
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PrincipalPropertySearchReport implements XmlDeserializable {
+
+    /**
+     * The requested properties.
+     *
+     * @var array|null
+     */
+    public $properties;
+
+    /**
+     * searchProperties
+     *
+     * @var array
+     */
+    public $searchProperties = [];
+
+    /**
+     * By default the property search will be conducted on the url of the http
+     * request. If this is set to true, it will be applied to the principal
+     * collection set instead.
+     *
+     * @var bool
+     */
+    public $applyToPrincipalCollectionSet = false;
+
+    /**
+     * Search for principals matching ANY of the properties (OR) or a ALL of
+     * the properties (AND).
+     *
+     * This property is either "anyof" or "allof".
+     *
+     * @var string
+     */
+    public $test;
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        $self = new self();
+
+        $foundSearchProp = false;
+        $self->test = 'allof';
+        if ($reader->getAttribute('test') === 'anyof') {
+            $self->test = 'anyof';
+        }
+
+        $elemMap = [
+            '{DAV:}property-search' => 'Sabre\\Xml\\Element\\KeyValue',
+            '{DAV:}prop'            => 'Sabre\\Xml\\Element\\KeyValue',
+        ];
+        
+        foreach ($reader->parseInnerTree($elemMap) as $elem) {
+
+            switch ($elem['name']) {
+
+                case '{DAV:}prop' :
+                    $self->properties = array_keys($elem['value']);
+                    break;
+                case '{DAV:}property-search' :
+                    $foundSearchProp = true;
+                    // This property has two sub-elements:
+                    //   {DAV:}prop - The property to be searched on. This may
+                    //                also be more than one
+                    //   {DAV:}match - The value to match with
+                    if (!isset($elem['value']['{DAV:}prop']) || !isset($elem['value']['{DAV:}match'])) {
+                        throw new BadRequest('The {DAV:}property-search element must contain one {DAV:}match and one {DAV:}prop element');
+                    }
+                    foreach ($elem['value']['{DAV:}prop'] as $propName => $discard) {
+                        $self->searchProperties[$propName] = $elem['value']['{DAV:}match'];
+                    }
+                    break;
+                case '{DAV:}apply-to-principal-collection-set' :
+                    $self->applyToPrincipalCollectionSet = true;
+                    break;
+
+            }
+
+        }
+        if (!$foundSearchProp) {
+            throw new BadRequest('The {DAV:}principal-property-search report must contain at least 1 {DAV:}property-search element');
+        }
+
+        return $self;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalSearchPropertySetReport.php b/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalSearchPropertySetReport.php
new file mode 100644
index 000000000..ade157b19
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalSearchPropertySetReport.php
@@ -0,0 +1,58 @@
+<?php
+
+namespace Sabre\DAVACL\Xml\Request;
+
+use Sabre\Xml\Reader;
+use Sabre\Xml\XmlDeserializable;
+use Sabre\DAV\Exception\BadRequest;
+
+/**
+ * PrincipalSearchPropertySetReport request parser.
+ *
+ * This class parses the {DAV:}principal-search-property-set REPORT, as defined
+ * in:
+ *
+ * https://tools.ietf.org/html/rfc3744#section-9.5
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class PrincipalSearchPropertySetReport implements XmlDeserializable {
+
+    /**
+     * The deserialize method is called during xml parsing.
+     *
+     * This method is called statictly, this is because in theory this method
+     * may be used as a type of constructor, or factory method.
+     *
+     * Often you want to return an instance of the current class, but you are
+     * free to return other data as well.
+     *
+     * You are responsible for advancing the reader to the next element. Not
+     * doing anything will result in a never-ending loop.
+     *
+     * If you just want to skip parsing for this element altogether, you can
+     * just call $reader->next();
+     *
+     * $reader->parseInnerTree() will parse the entire sub-tree, and advance to
+     * the next element.
+     *
+     * @param Reader $reader
+     * @return mixed
+     */
+    static function xmlDeserialize(Reader $reader) {
+
+        if (!$reader->isEmptyElement) {
+            throw new BadRequest('The {DAV:}principal-search-property-set element must be empty');
+        }
+
+        // The element is actually empty, so there's not much to do.
+        $reader->next();
+
+        $self = new self();
+        return $self;
+
+    }
+
+}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/AbstractBackend.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/AbstractBackend.php
deleted file mode 100644
index c83409eab..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/AbstractBackend.php
+++ /dev/null
@@ -1,155 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV\Backend;
-
-use Sabre\VObject;
-use Sabre\CalDAV;
-
-/**
- * Abstract Calendaring backend. Extend this class to create your own backends.
- *
- * Checkout the BackendInterface for all the methods that must be implemented.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-abstract class AbstractBackend implements BackendInterface {
-
-    /**
-     * Updates properties for a calendar.
-     *
-     * The mutations array uses the propertyName in clark-notation as key,
-     * and the array value for the property value. In the case a property
-     * should be deleted, the property value will be null.
-     *
-     * This method must be atomic. If one property cannot be changed, the
-     * entire operation must fail.
-     *
-     * If the operation was successful, true can be returned.
-     * If the operation failed, false can be returned.
-     *
-     * Deletion of a non-existent property is always successful.
-     *
-     * Lastly, it is optional to return detailed information about any
-     * failures. In this case an array should be returned with the following
-     * structure:
-     *
-     * array(
-     *   403 => array(
-     *      '{DAV:}displayname' => null,
-     *   ),
-     *   424 => array(
-     *      '{DAV:}owner' => null,
-     *   )
-     * )
-     *
-     * In this example it was forbidden to update {DAV:}displayname.
-     * (403 Forbidden), which in turn also caused {DAV:}owner to fail
-     * (424 Failed Dependency) because the request needs to be atomic.
-     *
-     * @param mixed $calendarId
-     * @param array $mutations
-     * @return bool|array
-     */
-    public function updateCalendar($calendarId, array $mutations) {
-
-        return false;
-
-    }
-
-    /**
-     * Performs a calendar-query on the contents of this calendar.
-     *
-     * The calendar-query is defined in RFC4791 : CalDAV. Using the
-     * calendar-query it is possible for a client to request a specific set of
-     * object, based on contents of iCalendar properties, date-ranges and
-     * iCalendar component types (VTODO, VEVENT).
-     *
-     * This method should just return a list of (relative) urls that match this
-     * query.
-     *
-     * The list of filters are specified as an array. The exact array is
-     * documented by \Sabre\CalDAV\CalendarQueryParser.
-     *
-     * Note that it is extremely likely that getCalendarObject for every path
-     * returned from this method will be called almost immediately after. You
-     * may want to anticipate this to speed up these requests.
-     *
-     * This method provides a default implementation, which parses *all* the
-     * iCalendar objects in the specified calendar.
-     *
-     * This default may well be good enough for personal use, and calendars
-     * that aren't very large. But if you anticipate high usage, big calendars
-     * or high loads, you are strongly adviced to optimize certain paths.
-     *
-     * The best way to do so is override this method and to optimize
-     * specifically for 'common filters'.
-     *
-     * Requests that are extremely common are:
-     *   * requests for just VEVENTS
-     *   * requests for just VTODO
-     *   * requests with a time-range-filter on either VEVENT or VTODO.
-     *
-     * ..and combinations of these requests. It may not be worth it to try to
-     * handle every possible situation and just rely on the (relatively
-     * easy to use) CalendarQueryValidator to handle the rest.
-     *
-     * Note that especially time-range-filters may be difficult to parse. A
-     * time-range filter specified on a VEVENT must for instance also handle
-     * recurrence rules correctly.
-     * A good example of how to interprete all these filters can also simply
-     * be found in \Sabre\CalDAV\CalendarQueryFilter. This class is as correct
-     * as possible, so it gives you a good idea on what type of stuff you need
-     * to think of.
-     *
-     * @param mixed $calendarId
-     * @param array $filters
-     * @return array
-     */
-    public function calendarQuery($calendarId, array $filters) {
-
-        $result = array();
-        $objects = $this->getCalendarObjects($calendarId);
-
-        $validator = new \Sabre\CalDAV\CalendarQueryValidator();
-
-        foreach($objects as $object) {
-
-            if ($this->validateFilterForObject($object, $filters)) {
-                $result[] = $object['uri'];
-            }
-
-        }
-
-        return $result;
-
-    }
-
-    /**
-     * This method validates if a filters (as passed to calendarQuery) matches
-     * the given object.
-     *
-     * @param array $object
-     * @param array $filters
-     * @return bool
-     */
-    protected function validateFilterForObject(array $object, array $filters) {
-
-        // Unfortunately, setting the 'calendardata' here is optional. If
-        // it was excluded, we actually need another call to get this as
-        // well.
-        if (!isset($object['calendardata'])) {
-            $object = $this->getCalendarObject($object['calendarid'], $object['uri']);
-        }
-
-        $data = is_resource($object['calendardata'])?stream_get_contents($object['calendardata']):$object['calendardata'];
-        $vObject = VObject\Reader::read($data);
-
-        $validator = new CalDAV\CalendarQueryValidator();
-        return $validator->validate($vObject, $filters);
-
-    }
-
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/PDO.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/PDO.php
deleted file mode 100644
index 2e93a7b25..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Backend/PDO.php
+++ /dev/null
@@ -1,691 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV\Backend;
-
-use Sabre\VObject;
-use Sabre\CalDAV;
-use Sabre\DAV;
-
-/**
- * PDO CalDAV backend
- *
- * This backend is used to store calendar-data in a PDO database, such as
- * sqlite or MySQL
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class PDO extends AbstractBackend {
-
-    /**
-     * We need to specify a max date, because we need to stop *somewhere*
-     *
-     * On 32 bit system the maximum for a signed integer is 2147483647, so
-     * MAX_DATE cannot be higher than date('Y-m-d', 2147483647) which results
-     * in 2038-01-19 to avoid problems when the date is converted
-     * to a unix timestamp.
-     */
-    const MAX_DATE = '2038-01-01';
-
-    /**
-     * pdo
-     *
-     * @var \PDO
-     */
-    protected $pdo;
-
-    /**
-     * The table name that will be used for calendars
-     *
-     * @var string
-     */
-    protected $calendarTableName;
-
-    /**
-     * The table name that will be used for calendar objects
-     *
-     * @var string
-     */
-    protected $calendarObjectTableName;
-
-    /**
-     * List of CalDAV properties, and how they map to database fieldnames
-     * Add your own properties by simply adding on to this array.
-     *
-     * Note that only string-based properties are supported here.
-     *
-     * @var array
-     */
-    public $propertyMap = array(
-        '{DAV:}displayname'                          => 'displayname',
-        '{urn:ietf:params:xml:ns:caldav}calendar-description' => 'description',
-        '{urn:ietf:params:xml:ns:caldav}calendar-timezone'    => 'timezone',
-        '{http://apple.com/ns/ical/}calendar-order'  => 'calendarorder',
-        '{http://apple.com/ns/ical/}calendar-color'  => 'calendarcolor',
-    );
-
-    /**
-     * Creates the backend
-     *
-     * @param \PDO $pdo
-     * @param string $calendarTableName
-     * @param string $calendarObjectTableName
-     */
-    public function __construct(\PDO $pdo, $calendarTableName = 'calendars', $calendarObjectTableName = 'calendarobjects') {
-
-        $this->pdo = $pdo;
-        $this->calendarTableName = $calendarTableName;
-        $this->calendarObjectTableName = $calendarObjectTableName;
-
-    }
-
-    /**
-     * Returns a list of calendars for a principal.
-     *
-     * Every project is an array with the following keys:
-     *  * id, a unique id that will be used by other functions to modify the
-     *    calendar. This can be the same as the uri or a database key.
-     *  * uri, which the basename of the uri with which the calendar is
-     *    accessed.
-     *  * principaluri. The owner of the calendar. Almost always the same as
-     *    principalUri passed to this method.
-     *
-     * Furthermore it can contain webdav properties in clark notation. A very
-     * common one is '{DAV:}displayname'.
-     *
-     * @param string $principalUri
-     * @return array
-     */
-    public function getCalendarsForUser($principalUri) {
-
-        $fields = array_values($this->propertyMap);
-        $fields[] = 'id';
-        $fields[] = 'uri';
-        $fields[] = 'ctag';
-        $fields[] = 'components';
-        $fields[] = 'principaluri';
-        $fields[] = 'transparent';
-
-        // Making fields a comma-delimited list
-        $fields = implode(', ', $fields);
-        $stmt = $this->pdo->prepare("SELECT " . $fields . " FROM ".$this->calendarTableName." WHERE principaluri = ? ORDER BY calendarorder ASC");
-        $stmt->execute(array($principalUri));
-
-        $calendars = array();
-        while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-
-            $components = array();
-            if ($row['components']) {
-                $components = explode(',',$row['components']);
-            }
-
-            $calendar = array(
-                'id' => $row['id'],
-                'uri' => $row['uri'],
-                'principaluri' => $row['principaluri'],
-                '{' . CalDAV\Plugin::NS_CALENDARSERVER . '}getctag' => $row['ctag']?$row['ctag']:'0',
-                '{' . CalDAV\Plugin::NS_CALDAV . '}supported-calendar-component-set' => new CalDAV\Property\SupportedCalendarComponentSet($components),
-                '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp' => new CalDAV\Property\ScheduleCalendarTransp($row['transparent']?'transparent':'opaque'),
-            );
-
-
-            foreach($this->propertyMap as $xmlName=>$dbName) {
-                $calendar[$xmlName] = $row[$dbName];
-            }
-
-            $calendars[] = $calendar;
-
-        }
-
-        return $calendars;
-
-    }
-
-    /**
-     * Creates a new calendar for a principal.
-     *
-     * If the creation was a success, an id must be returned that can be used to reference
-     * this calendar in other methods, such as updateCalendar
-     *
-     * @param string $principalUri
-     * @param string $calendarUri
-     * @param array $properties
-     * @return string
-     */
-    public function createCalendar($principalUri, $calendarUri, array $properties) {
-
-        $fieldNames = array(
-            'principaluri',
-            'uri',
-            'ctag',
-            'transparent',
-        );
-        $values = array(
-            ':principaluri' => $principalUri,
-            ':uri'          => $calendarUri,
-            ':ctag'         => 1,
-            ':transparent'  => 0,
-        );
-
-        // Default value
-        $sccs = '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set';
-        $fieldNames[] = 'components';
-        if (!isset($properties[$sccs])) {
-            $values[':components'] = 'VEVENT,VTODO';
-        } else {
-            if (!($properties[$sccs] instanceof CalDAV\Property\SupportedCalendarComponentSet)) {
-                throw new DAV\Exception('The ' . $sccs . ' property must be of type: \Sabre\CalDAV\Property\SupportedCalendarComponentSet');
-            }
-            $values[':components'] = implode(',',$properties[$sccs]->getValue());
-        }
-        $transp = '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp';
-        if (isset($properties[$transp])) {
-            $values[':transparent'] = $properties[$transp]->getValue()==='transparent';
-        }
-
-        foreach($this->propertyMap as $xmlName=>$dbName) {
-            if (isset($properties[$xmlName])) {
-
-                $values[':' . $dbName] = $properties[$xmlName];
-                $fieldNames[] = $dbName;
-            }
-        }
-
-        $stmt = $this->pdo->prepare("INSERT INTO ".$this->calendarTableName." (".implode(', ', $fieldNames).") VALUES (".implode(', ',array_keys($values)).")");
-        $stmt->execute($values);
-
-        return $this->pdo->lastInsertId();
-
-    }
-
-    /**
-     * Updates properties for a calendar.
-     *
-     * The mutations array uses the propertyName in clark-notation as key,
-     * and the array value for the property value. In the case a property
-     * should be deleted, the property value will be null.
-     *
-     * This method must be atomic. If one property cannot be changed, the
-     * entire operation must fail.
-     *
-     * If the operation was successful, true can be returned.
-     * If the operation failed, false can be returned.
-     *
-     * Deletion of a non-existent property is always successful.
-     *
-     * Lastly, it is optional to return detailed information about any
-     * failures. In this case an array should be returned with the following
-     * structure:
-     *
-     * array(
-     *   403 => array(
-     *      '{DAV:}displayname' => null,
-     *   ),
-     *   424 => array(
-     *      '{DAV:}owner' => null,
-     *   )
-     * )
-     *
-     * In this example it was forbidden to update {DAV:}displayname.
-     * (403 Forbidden), which in turn also caused {DAV:}owner to fail
-     * (424 Failed Dependency) because the request needs to be atomic.
-     *
-     * @param string $calendarId
-     * @param array $mutations
-     * @return bool|array
-     */
-    public function updateCalendar($calendarId, array $mutations) {
-
-        $newValues = array();
-        $result = array(
-            200 => array(), // Ok
-            403 => array(), // Forbidden
-            424 => array(), // Failed Dependency
-        );
-
-        $hasError = false;
-
-        foreach($mutations as $propertyName=>$propertyValue) {
-
-            switch($propertyName) {
-                case '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp' :
-                    $fieldName = 'transparent';
-                    $newValues[$fieldName] = $propertyValue->getValue()==='transparent';
-                    break;
-                default :
-                    // Checking the property map
-                    if (!isset($this->propertyMap[$propertyName])) {
-                        // We don't know about this property.
-                        $hasError = true;
-                        $result[403][$propertyName] = null;
-                        unset($mutations[$propertyName]);
-                        continue;
-                    }
-
-                    $fieldName = $this->propertyMap[$propertyName];
-                    $newValues[$fieldName] = $propertyValue;
-            }
-
-        }
-
-        // If there were any errors we need to fail the request
-        if ($hasError) {
-            // Properties has the remaining properties
-            foreach($mutations as $propertyName=>$propertyValue) {
-                $result[424][$propertyName] = null;
-            }
-
-            // Removing unused statuscodes for cleanliness
-            foreach($result as $status=>$properties) {
-                if (is_array($properties) && count($properties)===0) unset($result[$status]);
-            }
-
-            return $result;
-
-        }
-
-        // Success
-
-        // Now we're generating the sql query.
-        $valuesSql = array();
-        foreach($newValues as $fieldName=>$value) {
-            $valuesSql[] = $fieldName . ' = ?';
-        }
-        $valuesSql[] = 'ctag = ctag + 1';
-
-        $stmt = $this->pdo->prepare("UPDATE " . $this->calendarTableName . " SET " . implode(', ',$valuesSql) . " WHERE id = ?");
-        $newValues['id'] = $calendarId;
-        $stmt->execute(array_values($newValues));
-
-        return true;
-
-    }
-
-    /**
-     * Delete a calendar and all it's objects
-     *
-     * @param string $calendarId
-     * @return void
-     */
-    public function deleteCalendar($calendarId) {
-
-        $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarObjectTableName.' WHERE calendarid = ?');
-        $stmt->execute(array($calendarId));
-
-        $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarTableName.' WHERE id = ?');
-        $stmt->execute(array($calendarId));
-
-    }
-
-    /**
-     * Returns all calendar objects within a calendar.
-     *
-     * Every item contains an array with the following keys:
-     *   * id - unique identifier which will be used for subsequent updates
-     *   * calendardata - The iCalendar-compatible calendar data
-     *   * uri - a unique key which will be used to construct the uri. This can be any arbitrary string.
-     *   * lastmodified - a timestamp of the last modification time
-     *   * etag - An arbitrary string, surrounded by double-quotes. (e.g.:
-     *   '  "abcdef"')
-     *   * calendarid - The calendarid as it was passed to this function.
-     *   * size - The size of the calendar objects, in bytes.
-     *
-     * Note that the etag is optional, but it's highly encouraged to return for
-     * speed reasons.
-     *
-     * The calendardata is also optional. If it's not returned
-     * 'getCalendarObject' will be called later, which *is* expected to return
-     * calendardata.
-     *
-     * If neither etag or size are specified, the calendardata will be
-     * used/fetched to determine these numbers. If both are specified the
-     * amount of times this is needed is reduced by a great degree.
-     *
-     * @param string $calendarId
-     * @return array
-     */
-    public function getCalendarObjects($calendarId) {
-
-        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, calendarid, size FROM '.$this->calendarObjectTableName.' WHERE calendarid = ?');
-        $stmt->execute(array($calendarId));
-
-        $result = array();
-        foreach($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
-            $result[] = array(
-                'id'           => $row['id'],
-                'uri'          => $row['uri'],
-                'lastmodified' => $row['lastmodified'],
-                'etag'         => '"' . $row['etag'] . '"',
-                'calendarid'   => $row['calendarid'],
-                'size'         => (int)$row['size'],
-            );
-        }
-
-        return $result;
-
-    }
-
-    /**
-     * Returns information from a single calendar object, based on it's object
-     * uri.
-     *
-     * The returned array must have the same keys as getCalendarObjects. The
-     * 'calendardata' object is required here though, while it's not required
-     * for getCalendarObjects.
-     *
-     * This method must return null if the object did not exist.
-     *
-     * @param string $calendarId
-     * @param string $objectUri
-     * @return array|null
-     */
-    public function getCalendarObject($calendarId,$objectUri) {
-
-        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, calendarid, size, calendardata FROM '.$this->calendarObjectTableName.' WHERE calendarid = ? AND uri = ?');
-        $stmt->execute(array($calendarId, $objectUri));
-        $row = $stmt->fetch(\PDO::FETCH_ASSOC);
-
-        if(!$row) return null;
-
-        return array(
-            'id'           => $row['id'],
-            'uri'          => $row['uri'],
-            'lastmodified' => $row['lastmodified'],
-            'etag'         => '"' . $row['etag'] . '"',
-            'calendarid'   => $row['calendarid'],
-            'size'         => (int)$row['size'],
-            'calendardata' => $row['calendardata'],
-         );
-
-    }
-
-
-    /**
-     * Creates a new calendar object.
-     *
-     * It is possible return an etag from this function, which will be used in
-     * the response to this PUT request. Note that the ETag must be surrounded
-     * by double-quotes.
-     *
-     * However, you should only really return this ETag if you don't mangle the
-     * calendar-data. If the result of a subsequent GET to this object is not
-     * the exact same as this request body, you should omit the ETag.
-     *
-     * @param mixed $calendarId
-     * @param string $objectUri
-     * @param string $calendarData
-     * @return string|null
-     */
-    public function createCalendarObject($calendarId,$objectUri,$calendarData) {
-
-        $extraData = $this->getDenormalizedData($calendarData);
-
-        $stmt = $this->pdo->prepare('INSERT INTO '.$this->calendarObjectTableName.' (calendarid, uri, calendardata, lastmodified, etag, size, componenttype, firstoccurence, lastoccurence) VALUES (?,?,?,?,?,?,?,?,?)');
-        $stmt->execute(array(
-            $calendarId,
-            $objectUri,
-            $calendarData,
-            time(),
-            $extraData['etag'],
-            $extraData['size'],
-            $extraData['componentType'],
-            $extraData['firstOccurence'],
-            $extraData['lastOccurence'],
-        ));
-        $stmt = $this->pdo->prepare('UPDATE '.$this->calendarTableName.' SET ctag = ctag + 1 WHERE id = ?');
-        $stmt->execute(array($calendarId));
-
-        return '"' . $extraData['etag'] . '"';
-
-    }
-
-    /**
-     * Updates an existing calendarobject, based on it's uri.
-     *
-     * It is possible return an etag from this function, which will be used in
-     * the response to this PUT request. Note that the ETag must be surrounded
-     * by double-quotes.
-     *
-     * However, you should only really return this ETag if you don't mangle the
-     * calendar-data. If the result of a subsequent GET to this object is not
-     * the exact same as this request body, you should omit the ETag.
-     *
-     * @param mixed $calendarId
-     * @param string $objectUri
-     * @param string $calendarData
-     * @return string|null
-     */
-    public function updateCalendarObject($calendarId,$objectUri,$calendarData) {
-
-        $extraData = $this->getDenormalizedData($calendarData);
-
-        $stmt = $this->pdo->prepare('UPDATE '.$this->calendarObjectTableName.' SET calendardata = ?, lastmodified = ?, etag = ?, size = ?, componenttype = ?, firstoccurence = ?, lastoccurence = ? WHERE calendarid = ? AND uri = ?');
-        $stmt->execute(array($calendarData,time(), $extraData['etag'], $extraData['size'], $extraData['componentType'], $extraData['firstOccurence'], $extraData['lastOccurence'] ,$calendarId,$objectUri));
-        $stmt = $this->pdo->prepare('UPDATE '.$this->calendarTableName.' SET ctag = ctag + 1 WHERE id = ?');
-        $stmt->execute(array($calendarId));
-
-        return '"' . $extraData['etag'] . '"';
-
-    }
-
-    /**
-     * Parses some information from calendar objects, used for optimized
-     * calendar-queries.
-     *
-     * Returns an array with the following keys:
-     *   * etag
-     *   * size
-     *   * componentType
-     *   * firstOccurence
-     *   * lastOccurence
-     *
-     * @param string $calendarData
-     * @return array
-     */
-    protected function getDenormalizedData($calendarData) {
-
-        $vObject = VObject\Reader::read($calendarData);
-        $componentType = null;
-        $component = null;
-        $firstOccurence = null;
-        $lastOccurence = null;
-        foreach($vObject->getComponents() as $component) {
-            if ($component->name!=='VTIMEZONE') {
-                $componentType = $component->name;
-                break;
-            }
-        }
-        if (!$componentType) {
-            throw new \Sabre\DAV\Exception\BadRequest('Calendar objects must have a VJOURNAL, VEVENT or VTODO component');
-        }
-        if ($componentType === 'VEVENT') {
-            $firstOccurence = $component->DTSTART->getDateTime()->getTimeStamp();
-            // Finding the last occurence is a bit harder
-            if (!isset($component->RRULE)) {
-                if (isset($component->DTEND)) {
-                    $lastOccurence = $component->DTEND->getDateTime()->getTimeStamp();
-                } elseif (isset($component->DURATION)) {
-                    $endDate = clone $component->DTSTART->getDateTime();
-                    $endDate->add(VObject\DateTimeParser::parse($component->DURATION->getValue()));
-                    $lastOccurence = $endDate->getTimeStamp();
-                } elseif (!$component->DTSTART->hasTime()) {
-                    $endDate = clone $component->DTSTART->getDateTime();
-                    $endDate->modify('+1 day');
-                    $lastOccurence = $endDate->getTimeStamp();
-                } else {
-                    $lastOccurence = $firstOccurence;
-                }
-            } else {
-                $it = new VObject\RecurrenceIterator($vObject, (string)$component->UID);
-                $maxDate = new \DateTime(self::MAX_DATE);
-                if ($it->isInfinite()) {
-                    $lastOccurence = $maxDate->getTimeStamp();
-                } else {
-                    $end = $it->getDtEnd();
-                    while($it->valid() && $end < $maxDate) {
-                        $end = $it->getDtEnd();
-                        $it->next();
-
-                    }
-                    $lastOccurence = $end->getTimeStamp();
-                }
-
-            }
-        }
-
-        return array(
-            'etag' => md5($calendarData),
-            'size' => strlen($calendarData),
-            'componentType' => $componentType,
-            'firstOccurence' => $firstOccurence,
-            'lastOccurence'  => $lastOccurence,
-        );
-
-    }
-
-    /**
-     * Deletes an existing calendar object.
-     *
-     * @param string $calendarId
-     * @param string $objectUri
-     * @return void
-     */
-    public function deleteCalendarObject($calendarId,$objectUri) {
-
-        $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarObjectTableName.' WHERE calendarid = ? AND uri = ?');
-        $stmt->execute(array($calendarId,$objectUri));
-        $stmt = $this->pdo->prepare('UPDATE '. $this->calendarTableName .' SET ctag = ctag + 1 WHERE id = ?');
-        $stmt->execute(array($calendarId));
-
-    }
-
-    /**
-     * Performs a calendar-query on the contents of this calendar.
-     *
-     * The calendar-query is defined in RFC4791 : CalDAV. Using the
-     * calendar-query it is possible for a client to request a specific set of
-     * object, based on contents of iCalendar properties, date-ranges and
-     * iCalendar component types (VTODO, VEVENT).
-     *
-     * This method should just return a list of (relative) urls that match this
-     * query.
-     *
-     * The list of filters are specified as an array. The exact array is
-     * documented by \Sabre\CalDAV\CalendarQueryParser.
-     *
-     * Note that it is extremely likely that getCalendarObject for every path
-     * returned from this method will be called almost immediately after. You
-     * may want to anticipate this to speed up these requests.
-     *
-     * This method provides a default implementation, which parses *all* the
-     * iCalendar objects in the specified calendar.
-     *
-     * This default may well be good enough for personal use, and calendars
-     * that aren't very large. But if you anticipate high usage, big calendars
-     * or high loads, you are strongly adviced to optimize certain paths.
-     *
-     * The best way to do so is override this method and to optimize
-     * specifically for 'common filters'.
-     *
-     * Requests that are extremely common are:
-     *   * requests for just VEVENTS
-     *   * requests for just VTODO
-     *   * requests with a time-range-filter on a VEVENT.
-     *
-     * ..and combinations of these requests. It may not be worth it to try to
-     * handle every possible situation and just rely on the (relatively
-     * easy to use) CalendarQueryValidator to handle the rest.
-     *
-     * Note that especially time-range-filters may be difficult to parse. A
-     * time-range filter specified on a VEVENT must for instance also handle
-     * recurrence rules correctly.
-     * A good example of how to interprete all these filters can also simply
-     * be found in \Sabre\CalDAV\CalendarQueryFilter. This class is as correct
-     * as possible, so it gives you a good idea on what type of stuff you need
-     * to think of.
-     *
-     * This specific implementation (for the PDO) backend optimizes filters on
-     * specific components, and VEVENT time-ranges.
-     *
-     * @param string $calendarId
-     * @param array $filters
-     * @return array
-     */
-    public function calendarQuery($calendarId, array $filters) {
-
-        $result = array();
-        $validator = new \Sabre\CalDAV\CalendarQueryValidator();
-
-        $componentType = null;
-        $requirePostFilter = true;
-        $timeRange = null;
-
-        // if no filters were specified, we don't need to filter after a query
-        if (!$filters['prop-filters'] && !$filters['comp-filters']) {
-            $requirePostFilter = false;
-        }
-
-        // Figuring out if there's a component filter
-        if (count($filters['comp-filters']) > 0 && !$filters['comp-filters'][0]['is-not-defined']) {
-            $componentType = $filters['comp-filters'][0]['name'];
-
-            // Checking if we need post-filters
-            if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['time-range'] && !$filters['comp-filters'][0]['prop-filters']) {
-                $requirePostFilter = false;
-            }
-            // There was a time-range filter
-            if ($componentType == 'VEVENT' && isset($filters['comp-filters'][0]['time-range'])) {
-                $timeRange = $filters['comp-filters'][0]['time-range'];
-
-                // If start time OR the end time is not specified, we can do a
-                // 100% accurate mysql query.
-                if (!$filters['prop-filters'] && !$filters['comp-filters'][0]['comp-filters'] && !$filters['comp-filters'][0]['prop-filters'] && (!$timeRange['start'] || !$timeRange['end'])) {
-                    $requirePostFilter = false;
-                }
-            }
-
-        }
-
-        if ($requirePostFilter) {
-            $query = "SELECT uri, calendardata FROM ".$this->calendarObjectTableName." WHERE calendarid = :calendarid";
-        } else {
-            $query = "SELECT uri FROM ".$this->calendarObjectTableName." WHERE calendarid = :calendarid";
-        }
-
-        $values = array(
-            'calendarid' => $calendarId,
-        );
-
-        if ($componentType) {
-            $query.=" AND componenttype = :componenttype";
-            $values['componenttype'] = $componentType;
-        }
-
-        if ($timeRange && $timeRange['start']) {
-            $query.=" AND lastoccurence > :startdate";
-            $values['startdate'] = $timeRange['start']->getTimeStamp();
-        }
-        if ($timeRange && $timeRange['end']) {
-            $query.=" AND firstoccurence < :enddate";
-            $values['enddate'] = $timeRange['end']->getTimeStamp();
-        }
-
-        $stmt = $this->pdo->prepare($query);
-        $stmt->execute($values);
-
-        $result = array();
-        while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-            if ($requirePostFilter) {
-                if (!$this->validateFilterForObject($row, $filters)) {
-                    continue;
-                }
-            }
-            $result[] = $row['uri'];
-
-        }
-
-        return $result;
-
-    }
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Calendar.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Calendar.php
deleted file mode 100644
index 74fa15bb1..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Calendar.php
+++ /dev/null
@@ -1,376 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV;
-
-use Sabre\DAV;
-use Sabre\DAVACL;
-
-/**
- * This object represents a CalDAV calendar.
- *
- * A calendar can contain multiple TODO and or Events. These are represented
- * as \Sabre\CalDAV\CalendarObject objects.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Calendar implements ICalendar, DAV\IProperties, DAVACL\IACL {
-
-    /**
-     * This is an array with calendar information
-     *
-     * @var array
-     */
-    protected $calendarInfo;
-
-    /**
-     * CalDAV backend
-     *
-     * @var Backend\BackendInterface
-     */
-    protected $caldavBackend;
-
-    /**
-     * Constructor
-     *
-     * @param Backend\BackendInterface $caldavBackend
-     * @param array $calendarInfo
-     */
-    public function __construct(Backend\BackendInterface $caldavBackend, $calendarInfo) {
-
-        $this->caldavBackend = $caldavBackend;
-        $this->calendarInfo = $calendarInfo;
-
-    }
-
-    /**
-     * Returns the name of the calendar
-     *
-     * @return string
-     */
-    public function getName() {
-
-        return $this->calendarInfo['uri'];
-
-    }
-
-    /**
-     * Updates properties such as the display name and description
-     *
-     * @param array $mutations
-     * @return array
-     */
-    public function updateProperties($mutations) {
-
-        return $this->caldavBackend->updateCalendar($this->calendarInfo['id'],$mutations);
-
-    }
-
-    /**
-     * Returns the list of properties
-     *
-     * @param array $requestedProperties
-     * @return array
-     */
-    public function getProperties($requestedProperties) {
-
-        $response = array();
-
-        foreach($requestedProperties as $prop) switch($prop) {
-
-            case '{urn:ietf:params:xml:ns:caldav}supported-calendar-data' :
-                $response[$prop] = new Property\SupportedCalendarData();
-                break;
-            case '{urn:ietf:params:xml:ns:caldav}supported-collation-set' :
-                $response[$prop] =  new Property\SupportedCollationSet();
-                break;
-            case '{DAV:}owner' :
-                $response[$prop] = new DAVACL\Property\Principal(DAVACL\Property\Principal::HREF,$this->calendarInfo['principaluri']);
-                break;
-            default :
-                if (isset($this->calendarInfo[$prop])) $response[$prop] = $this->calendarInfo[$prop];
-                break;
-
-        }
-        return $response;
-
-    }
-
-    /**
-     * Returns a calendar object
-     *
-     * The contained calendar objects are for example Events or Todo's.
-     *
-     * @param string $name
-     * @return \Sabre\CalDAV\ICalendarObject
-     */
-    public function getChild($name) {
-
-        $obj = $this->caldavBackend->getCalendarObject($this->calendarInfo['id'],$name);
-
-        if (!$obj) throw new DAV\Exception\NotFound('Calendar object not found');
-
-        $obj['acl'] = $this->getACL();
-        // Removing the irrelivant
-        foreach($obj['acl'] as $key=>$acl) {
-            if ($acl['privilege'] === '{' . Plugin::NS_CALDAV . '}read-free-busy') {
-                unset($obj['acl'][$key]);
-            }
-        }
-
-        return new CalendarObject($this->caldavBackend,$this->calendarInfo,$obj);
-
-    }
-
-    /**
-     * Returns the full list of calendar objects
-     *
-     * @return array
-     */
-    public function getChildren() {
-
-        $objs = $this->caldavBackend->getCalendarObjects($this->calendarInfo['id']);
-        $children = array();
-        foreach($objs as $obj) {
-            $obj['acl'] = $this->getACL();
-            // Removing the irrelivant
-            foreach($obj['acl'] as $key=>$acl) {
-                if ($acl['privilege'] === '{' . Plugin::NS_CALDAV . '}read-free-busy') {
-                    unset($obj['acl'][$key]);
-                }
-            }
-            $children[] = new CalendarObject($this->caldavBackend,$this->calendarInfo,$obj);
-        }
-        return $children;
-
-    }
-
-    /**
-     * Checks if a child-node exists.
-     *
-     * @param string $name
-     * @return bool
-     */
-    public function childExists($name) {
-
-        $obj = $this->caldavBackend->getCalendarObject($this->calendarInfo['id'],$name);
-        if (!$obj)
-            return false;
-        else
-            return true;
-
-    }
-
-    /**
-     * Creates a new directory
-     *
-     * We actually block this, as subdirectories are not allowed in calendars.
-     *
-     * @param string $name
-     * @return void
-     */
-    public function createDirectory($name) {
-
-        throw new DAV\Exception\MethodNotAllowed('Creating collections in calendar objects is not allowed');
-
-    }
-
-    /**
-     * Creates a new file
-     *
-     * The contents of the new file must be a valid ICalendar string.
-     *
-     * @param string $name
-     * @param resource $calendarData
-     * @return string|null
-     */
-    public function createFile($name,$calendarData = null) {
-
-        if (is_resource($calendarData)) {
-            $calendarData = stream_get_contents($calendarData);
-        }
-        return $this->caldavBackend->createCalendarObject($this->calendarInfo['id'],$name,$calendarData);
-
-    }
-
-    /**
-     * Deletes the calendar.
-     *
-     * @return void
-     */
-    public function delete() {
-
-        $this->caldavBackend->deleteCalendar($this->calendarInfo['id']);
-
-    }
-
-    /**
-     * Renames the calendar. Note that most calendars use the
-     * {DAV:}displayname to display a name to display a name.
-     *
-     * @param string $newName
-     * @return void
-     */
-    public function setName($newName) {
-
-        throw new DAV\Exception\MethodNotAllowed('Renaming calendars is not yet supported');
-
-    }
-
-    /**
-     * Returns the last modification date as a unix timestamp.
-     *
-     * @return void
-     */
-    public function getLastModified() {
-
-        return null;
-
-    }
-
-    /**
-     * Returns the owner principal
-     *
-     * This must be a url to a principal, or null if there's no owner
-     *
-     * @return string|null
-     */
-    public function getOwner() {
-
-        return $this->calendarInfo['principaluri'];
-
-    }
-
-    /**
-     * Returns a group principal
-     *
-     * This must be a url to a principal, or null if there's no owner
-     *
-     * @return string|null
-     */
-    public function getGroup() {
-
-        return null;
-
-    }
-
-    /**
-     * Returns a list of ACE's for this node.
-     *
-     * Each ACE has the following properties:
-     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
-     *     currently the only supported privileges
-     *   * 'principal', a url to the principal who owns the node
-     *   * 'protected' (optional), indicating that this ACE is not allowed to
-     *      be updated.
-     *
-     * @return array
-     */
-    public function getACL() {
-
-        return array(
-            array(
-                'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner(),
-                'protected' => true,
-            ),
-            array(
-                'privilege' => '{DAV:}write',
-                'principal' => $this->getOwner(),
-                'protected' => true,
-            ),
-            array(
-                'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
-                'protected' => true,
-            ),
-            array(
-                'privilege' => '{DAV:}write',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
-                'protected' => true,
-            ),
-            array(
-                'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner() . '/calendar-proxy-read',
-                'protected' => true,
-            ),
-            array(
-                'privilege' => '{' . Plugin::NS_CALDAV . '}read-free-busy',
-                'principal' => '{DAV:}authenticated',
-                'protected' => true,
-            ),
-
-        );
-
-    }
-
-    /**
-     * Updates the ACL
-     *
-     * This method will receive a list of new ACE's.
-     *
-     * @param array $acl
-     * @return void
-     */
-    public function setACL(array $acl) {
-
-        throw new DAV\Exception\MethodNotAllowed('Changing ACL is not yet supported');
-
-    }
-
-    /**
-     * Returns the list of supported privileges for this node.
-     *
-     * The returned data structure is a list of nested privileges.
-     * See \Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
-     * standard structure.
-     *
-     * If null is returned from this method, the default privilege set is used,
-     * which is fine for most common usecases.
-     *
-     * @return array|null
-     */
-    public function getSupportedPrivilegeSet() {
-
-        $default = DAVACL\Plugin::getDefaultSupportedPrivilegeSet();
-
-        // We need to inject 'read-free-busy' in the tree, aggregated under
-        // {DAV:}read.
-        foreach($default['aggregates'] as &$agg) {
-
-            if ($agg['privilege'] !== '{DAV:}read') continue;
-
-            $agg['aggregates'][] = array(
-                'privilege' => '{' . Plugin::NS_CALDAV . '}read-free-busy',
-            );
-
-        }
-        return $default;
-
-    }
-
-    /**
-     * Performs a calendar-query on the contents of this calendar.
-     *
-     * The calendar-query is defined in RFC4791 : CalDAV. Using the
-     * calendar-query it is possible for a client to request a specific set of
-     * object, based on contents of iCalendar properties, date-ranges and
-     * iCalendar component types (VTODO, VEVENT).
-     *
-     * This method should just return a list of (relative) urls that match this
-     * query.
-     *
-     * The list of filters are specified as an array. The exact array is
-     * documented by Sabre\CalDAV\CalendarQueryParser.
-     *
-     * @param array $filters
-     * @return array
-     */
-    public function calendarQuery(array $filters) {
-
-        return $this->caldavBackend->calendarQuery($this->calendarInfo['id'], $filters);
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/CalendarQueryParser.php b/vendor/sabre/dav/lib/Sabre/CalDAV/CalendarQueryParser.php
deleted file mode 100644
index 0a3472408..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/CalendarQueryParser.php
+++ /dev/null
@@ -1,298 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV;
-
-use Sabre\VObject;
-
-/**
- * Parses the calendar-query report request body.
- *
- * Whoever designed this format, and the CalDAV equivalent even more so,
- * has no feel for design.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class CalendarQueryParser {
-
-    /**
-     * List of requested properties the client wanted
-     *
-     * @var array
-     */
-    public $requestedProperties;
-
-    /**
-     * List of property/component filters.
-     *
-     * @var array
-     */
-    public $filters;
-
-    /**
-     * This property will contain null if CALDAV:expand was not specified,
-     * otherwise it will contain an array with 2 elements (start, end). Each
-     * contain a DateTime object.
-     *
-     * If expand is specified, recurring calendar objects are to be expanded
-     * into their individual components, and only the components that fall
-     * within the specified time-range are to be returned.
-     *
-     * For more details, see rfc4791, section 9.6.5.
-     *
-     * @var null|array
-     */
-    public $expand;
-
-    /**
-     * DOM Document
-     *
-     * @var DOMDocument
-     */
-    protected $dom;
-
-    /**
-     * DOM XPath object
-     *
-     * @var DOMXPath
-     */
-    protected $xpath;
-
-    /**
-     * Creates the parser
-     *
-     * @param \DOMDocument $dom
-     */
-    public function __construct(\DOMDocument $dom) {
-
-        $this->dom = $dom;
-        $this->xpath = new \DOMXPath($dom);
-        $this->xpath->registerNameSpace('cal',Plugin::NS_CALDAV);
-        $this->xpath->registerNameSpace('dav','urn:DAV');
-
-    }
-
-    /**
-     * Parses the request.
-     *
-     * @return void
-     */
-    public function parse() {
-
-        $filterNode = null;
-
-        $filter = $this->xpath->query('/cal:calendar-query/cal:filter');
-        if ($filter->length !== 1) {
-            throw new \Sabre\DAV\Exception\BadRequest('Only one filter element is allowed');
-        }
-
-        $compFilters = $this->parseCompFilters($filter->item(0));
-        if (count($compFilters)!==1) {
-            throw new \Sabre\DAV\Exception\BadRequest('There must be exactly 1 top-level comp-filter.');
-        }
-
-        $this->filters = $compFilters[0];
-        $this->requestedProperties = array_keys(\Sabre\DAV\XMLUtil::parseProperties($this->dom->firstChild));
-
-        $expand = $this->xpath->query('/cal:calendar-query/dav:prop/cal:calendar-data/cal:expand');
-        if ($expand->length>0) {
-            $this->expand = $this->parseExpand($expand->item(0));
-        }
-
-
-    }
-
-    /**
-     * Parses all the 'comp-filter' elements from a node
-     *
-     * @param \DOMElement $parentNode
-     * @return array
-     */
-    protected function parseCompFilters(\DOMElement $parentNode) {
-
-        $compFilterNodes = $this->xpath->query('cal:comp-filter', $parentNode);
-        $result = array();
-
-        for($ii=0; $ii < $compFilterNodes->length; $ii++) {
-
-            $compFilterNode = $compFilterNodes->item($ii);
-
-            $compFilter = array();
-            $compFilter['name'] = $compFilterNode->getAttribute('name');
-            $compFilter['is-not-defined'] = $this->xpath->query('cal:is-not-defined', $compFilterNode)->length>0;
-            $compFilter['comp-filters'] = $this->parseCompFilters($compFilterNode);
-            $compFilter['prop-filters'] = $this->parsePropFilters($compFilterNode);
-            $compFilter['time-range'] = $this->parseTimeRange($compFilterNode);
-
-            if ($compFilter['time-range'] && !in_array($compFilter['name'],array(
-                'VEVENT',
-                'VTODO',
-                'VJOURNAL',
-                'VFREEBUSY',
-                'VALARM',
-            ))) {
-                throw new \Sabre\DAV\Exception\BadRequest('The time-range filter is not defined for the ' . $compFilter['name'] . ' component');
-            };
-
-            $result[] = $compFilter;
-
-        }
-
-        return $result;
-
-    }
-
-    /**
-     * Parses all the prop-filter elements from a node
-     *
-     * @param \DOMElement $parentNode
-     * @return array
-     */
-    protected function parsePropFilters(\DOMElement $parentNode) {
-
-        $propFilterNodes = $this->xpath->query('cal:prop-filter', $parentNode);
-        $result = array();
-
-        for ($ii=0; $ii < $propFilterNodes->length; $ii++) {
-
-            $propFilterNode = $propFilterNodes->item($ii);
-            $propFilter = array();
-            $propFilter['name'] = $propFilterNode->getAttribute('name');
-            $propFilter['is-not-defined'] = $this->xpath->query('cal:is-not-defined', $propFilterNode)->length>0;
-            $propFilter['param-filters'] = $this->parseParamFilters($propFilterNode);
-            $propFilter['text-match'] = $this->parseTextMatch($propFilterNode);
-            $propFilter['time-range'] = $this->parseTimeRange($propFilterNode);
-
-            $result[] = $propFilter;
-
-        }
-
-        return $result;
-
-    }
-
-    /**
-     * Parses the param-filter element
-     *
-     * @param \DOMElement $parentNode
-     * @return array
-     */
-    protected function parseParamFilters(\DOMElement $parentNode) {
-
-        $paramFilterNodes = $this->xpath->query('cal:param-filter', $parentNode);
-        $result = array();
-
-        for($ii=0;$ii<$paramFilterNodes->length;$ii++) {
-
-            $paramFilterNode = $paramFilterNodes->item($ii);
-            $paramFilter = array();
-            $paramFilter['name'] = $paramFilterNode->getAttribute('name');
-            $paramFilter['is-not-defined'] = $this->xpath->query('cal:is-not-defined', $paramFilterNode)->length>0;
-            $paramFilter['text-match'] = $this->parseTextMatch($paramFilterNode);
-
-            $result[] = $paramFilter;
-
-        }
-
-        return $result;
-
-    }
-
-    /**
-     * Parses the text-match element
-     *
-     * @param \DOMElement $parentNode
-     * @return array|null
-     */
-    protected function parseTextMatch(\DOMElement $parentNode) {
-
-        $textMatchNodes = $this->xpath->query('cal:text-match', $parentNode);
-
-        if ($textMatchNodes->length === 0)
-            return null;
-
-        $textMatchNode = $textMatchNodes->item(0);
-        $negateCondition = $textMatchNode->getAttribute('negate-condition');
-        $negateCondition = $negateCondition==='yes';
-        $collation = $textMatchNode->getAttribute('collation');
-        if (!$collation) $collation = 'i;ascii-casemap';
-
-        return array(
-            'negate-condition' => $negateCondition,
-            'collation' => $collation,
-            'value' => $textMatchNode->nodeValue
-        );
-
-    }
-
-    /**
-     * Parses the time-range element
-     *
-     * @param \DOMElement $parentNode
-     * @return array|null
-     */
-    protected function parseTimeRange(\DOMElement $parentNode) {
-
-        $timeRangeNodes = $this->xpath->query('cal:time-range', $parentNode);
-        if ($timeRangeNodes->length === 0) {
-            return null;
-        }
-
-        $timeRangeNode = $timeRangeNodes->item(0);
-
-        if ($start = $timeRangeNode->getAttribute('start')) {
-            $start = VObject\DateTimeParser::parseDateTime($start);
-        } else {
-            $start = null;
-        }
-        if ($end = $timeRangeNode->getAttribute('end')) {
-            $end = VObject\DateTimeParser::parseDateTime($end);
-        } else {
-            $end = null;
-        }
-
-        if (!is_null($start) && !is_null($end) && $end <= $start) {
-            throw new \Sabre\DAV\Exception\BadRequest('The end-date must be larger than the start-date in the time-range filter');
-        }
-
-        return array(
-            'start' => $start,
-            'end' => $end,
-        );
-
-    }
-
-    /**
-     * Parses the CALDAV:expand element
-     *
-     * @param \DOMElement $parentNode
-     * @return void
-     */
-    protected function parseExpand(\DOMElement $parentNode) {
-
-        $start = $parentNode->getAttribute('start');
-        if(!$start) {
-            throw new \Sabre\DAV\Exception\BadRequest('The "start" attribute is required for the CALDAV:expand element');
-        }
-        $start = VObject\DateTimeParser::parseDateTime($start);
-
-        $end = $parentNode->getAttribute('end');
-        if(!$end) {
-            throw new \Sabre\DAV\Exception\BadRequest('The "end" attribute is required for the CALDAV:expand element');
-        }
-
-        $end = VObject\DateTimeParser::parseDateTime($end);
-
-        if ($end <= $start) {
-            throw new \Sabre\DAV\Exception\BadRequest('The end-date must be larger than the start-date in the expand element.');
-        }
-
-        return array(
-            'start' => $start,
-            'end' => $end,
-        );
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/ICSExportPlugin.php b/vendor/sabre/dav/lib/Sabre/CalDAV/ICSExportPlugin.php
deleted file mode 100644
index bba7fbd5a..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/ICSExportPlugin.php
+++ /dev/null
@@ -1,142 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV;
-
-use Sabre\DAV;
-use Sabre\VObject;
-
-/**
- * ICS Exporter
- *
- * This plugin adds the ability to export entire calendars as .ics files.
- * This is useful for clients that don't support CalDAV yet. They often do
- * support ics files.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class ICSExportPlugin extends DAV\ServerPlugin {
-
-    /**
-     * Reference to Server class
-     *
-     * @var \Sabre\DAV\Server
-     */
-    protected $server;
-
-    /**
-     * Initializes the plugin and registers event handlers
-     *
-     * @param \Sabre\DAV\Server $server
-     * @return void
-     */
-    public function initialize(DAV\Server $server) {
-
-        $this->server = $server;
-        $this->server->subscribeEvent('beforeMethod',array($this,'beforeMethod'), 90);
-
-    }
-
-    /**
-     * 'beforeMethod' event handles. This event handles intercepts GET requests ending
-     * with ?export
-     *
-     * @param string $method
-     * @param string $uri
-     * @return bool
-     */
-    public function beforeMethod($method, $uri) {
-
-        if ($method!='GET') return;
-        if ($this->server->httpRequest->getQueryString()!='export') return;
-
-        // splitting uri
-        list($uri) = explode('?',$uri,2);
-
-        $node = $this->server->tree->getNodeForPath($uri);
-
-        if (!($node instanceof Calendar)) return;
-
-        // Checking ACL, if available.
-        if ($aclPlugin = $this->server->getPlugin('acl')) {
-            $aclPlugin->checkPrivileges($uri, '{DAV:}read');
-        }
-
-        $this->server->httpResponse->setHeader('Content-Type','text/calendar');
-        $this->server->httpResponse->sendStatus(200);
-
-        $nodes = $this->server->getPropertiesForPath($uri, array(
-            '{' . Plugin::NS_CALDAV . '}calendar-data',
-        ),1);
-
-        $this->server->httpResponse->sendBody($this->generateICS($nodes));
-
-        // Returning false to break the event chain
-        return false;
-
-    }
-
-    /**
-     * Merges all calendar objects, and builds one big ics export
-     *
-     * @param array $nodes
-     * @return string
-     */
-    public function generateICS(array $nodes) {
-
-        $calendar = new VObject\Component\VCalendar();
-        $calendar->version = '2.0';
-        if (DAV\Server::$exposeVersion) {
-            $calendar->prodid = '-//SabreDAV//SabreDAV ' . DAV\Version::VERSION . '//EN';
-        } else {
-            $calendar->prodid = '-//SabreDAV//SabreDAV//EN';
-        }
-        $calendar->calscale = 'GREGORIAN';
-
-        $collectedTimezones = array();
-
-        $timezones = array();
-        $objects = array();
-
-        foreach($nodes as $node) {
-
-            if (!isset($node[200]['{' . Plugin::NS_CALDAV . '}calendar-data'])) {
-                continue;
-            }
-            $nodeData = $node[200]['{' . Plugin::NS_CALDAV . '}calendar-data'];
-
-            $nodeComp = VObject\Reader::read($nodeData);
-
-            foreach($nodeComp->children() as $child) {
-
-                switch($child->name) {
-                    case 'VEVENT' :
-                    case 'VTODO' :
-                    case 'VJOURNAL' :
-                        $objects[] = $child;
-                        break;
-
-                    // VTIMEZONE is special, because we need to filter out the duplicates
-                    case 'VTIMEZONE' :
-                        // Naively just checking tzid.
-                        if (in_array((string)$child->TZID, $collectedTimezones)) continue;
-
-                        $timezones[] = $child;
-                        $collectedTimezones[] = $child->TZID;
-                        break;
-
-                }
-
-            }
-
-        }
-
-        foreach($timezones as $tz) $calendar->add($tz);
-        foreach($objects as $obj) $calendar->add($obj);
-
-        return $calendar->serialize();
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Plugin.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Plugin.php
deleted file mode 100644
index 610929388..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Plugin.php
+++ /dev/null
@@ -1,1338 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV;
-
-use Sabre\DAV;
-use Sabre\DAVACL;
-use Sabre\VObject;
-
-/**
- * CalDAV plugin
- *
- * This plugin provides functionality added by CalDAV (RFC 4791)
- * It implements new reports, and the MKCALENDAR method.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Plugin extends DAV\ServerPlugin {
-
-    /**
-     * This is the official CalDAV namespace
-     */
-    const NS_CALDAV = 'urn:ietf:params:xml:ns:caldav';
-
-    /**
-     * This is the namespace for the proprietary calendarserver extensions
-     */
-    const NS_CALENDARSERVER = 'http://calendarserver.org/ns/';
-
-    /**
-     * The hardcoded root for calendar objects. It is unfortunate
-     * that we're stuck with it, but it will have to do for now
-     */
-    const CALENDAR_ROOT = 'calendars';
-
-    /**
-     * Reference to server object
-     *
-     * @var DAV\Server
-     */
-    protected $server;
-
-    /**
-     * The email handler for invites and other scheduling messages.
-     *
-     * @var Schedule\IMip
-     */
-    protected $imipHandler;
-
-    /**
-     * Sets the iMIP handler.
-     *
-     * iMIP = The email transport of iCalendar scheduling messages. Setting
-     * this is optional, but if you want the server to allow invites to be sent
-     * out, you must set a handler.
-     *
-     * Specifically iCal will plain assume that the server supports this. If
-     * the server doesn't, iCal will display errors when inviting people to
-     * events.
-     *
-     * @param Schedule\IMip $imipHandler
-     * @return void
-     */
-    public function setIMipHandler(Schedule\IMip $imipHandler) {
-
-        $this->imipHandler = $imipHandler;
-
-    }
-
-    /**
-     * Use this method to tell the server this plugin defines additional
-     * HTTP methods.
-     *
-     * This method is passed a uri. It should only return HTTP methods that are
-     * available for the specified uri.
-     *
-     * @param string $uri
-     * @return array
-     */
-    public function getHTTPMethods($uri) {
-
-        // The MKCALENDAR is only available on unmapped uri's, whose
-        // parents extend IExtendedCollection
-        list($parent, $name) = DAV\URLUtil::splitPath($uri);
-
-        $node = $this->server->tree->getNodeForPath($parent);
-
-        if ($node instanceof DAV\IExtendedCollection) {
-            try {
-                $node->getChild($name);
-            } catch (DAV\Exception\NotFound $e) {
-                return array('MKCALENDAR');
-            }
-        }
-        return array();
-
-    }
-
-    /**
-     * Returns a list of features for the DAV: HTTP header.
-     *
-     * @return array
-     */
-    public function getFeatures() {
-
-        return array('calendar-access', 'calendar-proxy');
-
-    }
-
-    /**
-     * Returns a plugin name.
-     *
-     * Using this name other plugins will be able to access other plugins
-     * using DAV\Server::getPlugin
-     *
-     * @return string
-     */
-    public function getPluginName() {
-
-        return 'caldav';
-
-    }
-
-    /**
-     * Returns a list of reports this plugin supports.
-     *
-     * This will be used in the {DAV:}supported-report-set property.
-     * Note that you still need to subscribe to the 'report' event to actually
-     * implement them
-     *
-     * @param string $uri
-     * @return array
-     */
-    public function getSupportedReportSet($uri) {
-
-        $node = $this->server->tree->getNodeForPath($uri);
-
-        $reports = array();
-        if ($node instanceof ICalendar || $node instanceof ICalendarObject) {
-            $reports[] = '{' . self::NS_CALDAV . '}calendar-multiget';
-            $reports[] = '{' . self::NS_CALDAV . '}calendar-query';
-        }
-        if ($node instanceof ICalendar) {
-            $reports[] = '{' . self::NS_CALDAV . '}free-busy-query';
-        }
-        return $reports;
-
-    }
-
-    /**
-     * Initializes the plugin
-     *
-     * @param DAV\Server $server
-     * @return void
-     */
-    public function initialize(DAV\Server $server) {
-
-        $this->server = $server;
-
-        $server->subscribeEvent('unknownMethod',array($this,'unknownMethod'));
-        //$server->subscribeEvent('unknownMethod',array($this,'unknownMethod2'),1000);
-        $server->subscribeEvent('report',array($this,'report'));
-        $server->subscribeEvent('beforeGetProperties',array($this,'beforeGetProperties'));
-        $server->subscribeEvent('onHTMLActionsPanel', array($this,'htmlActionsPanel'));
-        $server->subscribeEvent('onBrowserPostAction', array($this,'browserPostAction'));
-        $server->subscribeEvent('beforeWriteContent', array($this, 'beforeWriteContent'));
-        $server->subscribeEvent('beforeCreateFile', array($this, 'beforeCreateFile'));
-        $server->subscribeEvent('beforeMethod', array($this,'beforeMethod'));
-
-        $server->xmlNamespaces[self::NS_CALDAV] = 'cal';
-        $server->xmlNamespaces[self::NS_CALENDARSERVER] = 'cs';
-
-        $server->propertyMap['{' . self::NS_CALDAV . '}supported-calendar-component-set'] = 'Sabre\\CalDAV\\Property\\SupportedCalendarComponentSet';
-        $server->propertyMap['{' . self::NS_CALDAV . '}schedule-calendar-transp'] = 'Sabre\\CalDAV\\Property\\ScheduleCalendarTransp';
-
-        $server->resourceTypeMapping['\\Sabre\\CalDAV\\ICalendar'] = '{urn:ietf:params:xml:ns:caldav}calendar';
-        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Schedule\\IOutbox'] = '{urn:ietf:params:xml:ns:caldav}schedule-outbox';
-        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Principal\\IProxyRead'] = '{http://calendarserver.org/ns/}calendar-proxy-read';
-        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Principal\\IProxyWrite'] = '{http://calendarserver.org/ns/}calendar-proxy-write';
-        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Notifications\\ICollection'] = '{' . self::NS_CALENDARSERVER . '}notification';
-
-        array_push($server->protectedProperties,
-
-            '{' . self::NS_CALDAV . '}supported-calendar-component-set',
-            '{' . self::NS_CALDAV . '}supported-calendar-data',
-            '{' . self::NS_CALDAV . '}max-resource-size',
-            '{' . self::NS_CALDAV . '}min-date-time',
-            '{' . self::NS_CALDAV . '}max-date-time',
-            '{' . self::NS_CALDAV . '}max-instances',
-            '{' . self::NS_CALDAV . '}max-attendees-per-instance',
-            '{' . self::NS_CALDAV . '}calendar-home-set',
-            '{' . self::NS_CALDAV . '}supported-collation-set',
-            '{' . self::NS_CALDAV . '}calendar-data',
-
-            // scheduling extension
-            '{' . self::NS_CALDAV . '}schedule-inbox-URL',
-            '{' . self::NS_CALDAV . '}schedule-outbox-URL',
-            '{' . self::NS_CALDAV . '}calendar-user-address-set',
-            '{' . self::NS_CALDAV . '}calendar-user-type',
-
-            // CalendarServer extensions
-            '{' . self::NS_CALENDARSERVER . '}getctag',
-            '{' . self::NS_CALENDARSERVER . '}calendar-proxy-read-for',
-            '{' . self::NS_CALENDARSERVER . '}calendar-proxy-write-for',
-            '{' . self::NS_CALENDARSERVER . '}notification-URL',
-            '{' . self::NS_CALENDARSERVER . '}notificationtype'
-
-        );
-    }
-
-    /**
-     * This function handles support for the MKCALENDAR method
-     *
-     * @param string $method
-     * @param string $uri
-     * @return bool
-     */
-    public function unknownMethod($method, $uri) {
-
-        switch ($method) {
-            case 'MKCALENDAR' :
-                $this->httpMkCalendar($uri);
-                // false is returned to stop the propagation of the
-                // unknownMethod event.
-                return false;
-            case 'POST' :
-
-                // Checking if this is a text/calendar content type
-                $contentType = $this->server->httpRequest->getHeader('Content-Type');
-                if (strpos($contentType, 'text/calendar')!==0) {
-                    return;
-                }
-
-                // Checking if we're talking to an outbox
-                try {
-                    $node = $this->server->tree->getNodeForPath($uri);
-                } catch (DAV\Exception\NotFound $e) {
-                    return;
-                }
-                if (!$node instanceof Schedule\IOutbox)
-                    return;
-
-                $this->outboxRequest($node, $uri);
-                return false;
-
-        }
-
-    }
-
-    /**
-     * This functions handles REPORT requests specific to CalDAV
-     *
-     * @param string $reportName
-     * @param \DOMNode $dom
-     * @return bool
-     */
-    public function report($reportName,$dom) {
-
-        switch($reportName) {
-            case '{'.self::NS_CALDAV.'}calendar-multiget' :
-                $this->calendarMultiGetReport($dom);
-                return false;
-            case '{'.self::NS_CALDAV.'}calendar-query' :
-                $this->calendarQueryReport($dom);
-                return false;
-            case '{'.self::NS_CALDAV.'}free-busy-query' :
-                $this->freeBusyQueryReport($dom);
-                return false;
-
-        }
-
-
-    }
-
-    /**
-     * This function handles the MKCALENDAR HTTP method, which creates
-     * a new calendar.
-     *
-     * @param string $uri
-     * @return void
-     */
-    public function httpMkCalendar($uri) {
-
-        // Due to unforgivable bugs in iCal, we're completely disabling MKCALENDAR support
-        // for clients matching iCal in the user agent
-        //$ua = $this->server->httpRequest->getHeader('User-Agent');
-        //if (strpos($ua,'iCal/')!==false) {
-        //    throw new \Sabre\DAV\Exception\Forbidden('iCal has major bugs in it\'s RFC3744 support. Therefore we are left with no other choice but disabling this feature.');
-        //}
-
-        $body = $this->server->httpRequest->getBody(true);
-        $properties = array();
-
-        if ($body) {
-
-            $dom = DAV\XMLUtil::loadDOMDocument($body);
-
-            foreach($dom->firstChild->childNodes as $child) {
-
-                if (DAV\XMLUtil::toClarkNotation($child)!=='{DAV:}set') continue;
-                foreach(DAV\XMLUtil::parseProperties($child,$this->server->propertyMap) as $k=>$prop) {
-                    $properties[$k] = $prop;
-                }
-
-            }
-        }
-
-        $resourceType = array('{DAV:}collection','{urn:ietf:params:xml:ns:caldav}calendar');
-
-        $this->server->createCollection($uri,$resourceType,$properties);
-
-        $this->server->httpResponse->sendStatus(201);
-        $this->server->httpResponse->setHeader('Content-Length',0);
-    }
-
-    /**
-     * beforeGetProperties
-     *
-     * This method handler is invoked before any after properties for a
-     * resource are fetched. This allows us to add in any CalDAV specific
-     * properties.
-     *
-     * @param string $path
-     * @param DAV\INode $node
-     * @param array $requestedProperties
-     * @param array $returnedProperties
-     * @return void
-     */
-    public function beforeGetProperties($path, DAV\INode $node, &$requestedProperties, &$returnedProperties) {
-
-        if ($node instanceof DAVACL\IPrincipal) {
-
-            // calendar-home-set property
-            $calHome = '{' . self::NS_CALDAV . '}calendar-home-set';
-            if (in_array($calHome,$requestedProperties)) {
-                $principalId = $node->getName();
-                $calendarHomePath = self::CALENDAR_ROOT . '/' . $principalId . '/';
-
-                unset($requestedProperties[array_search($calHome, $requestedProperties)]);
-                $returnedProperties[200][$calHome] = new DAV\Property\Href($calendarHomePath);
-
-            }
-
-            // schedule-outbox-URL property
-            $scheduleProp = '{' . self::NS_CALDAV . '}schedule-outbox-URL';
-            if (in_array($scheduleProp,$requestedProperties)) {
-                $principalId = $node->getName();
-                $outboxPath = self::CALENDAR_ROOT . '/' . $principalId . '/outbox';
-
-                unset($requestedProperties[array_search($scheduleProp, $requestedProperties)]);
-                $returnedProperties[200][$scheduleProp] = new DAV\Property\Href($outboxPath);
-
-            }
-
-            // calendar-user-address-set property
-            $calProp = '{' . self::NS_CALDAV . '}calendar-user-address-set';
-            if (in_array($calProp,$requestedProperties)) {
-
-                $addresses = $node->getAlternateUriSet();
-                $addresses[] = $this->server->getBaseUri() . DAV\URLUtil::encodePath($node->getPrincipalUrl() . '/');
-                unset($requestedProperties[array_search($calProp, $requestedProperties)]);
-                $returnedProperties[200][$calProp] = new DAV\Property\HrefList($addresses, false);
-
-            }
-
-            // These two properties are shortcuts for ical to easily find
-            // other principals this principal has access to.
-            $propRead = '{' . self::NS_CALENDARSERVER . '}calendar-proxy-read-for';
-            $propWrite = '{' . self::NS_CALENDARSERVER . '}calendar-proxy-write-for';
-            if (in_array($propRead,$requestedProperties) || in_array($propWrite,$requestedProperties)) {
-
-                $aclPlugin = $this->server->getPlugin('acl');
-                $membership = $aclPlugin->getPrincipalMembership($path);
-                $readList = array();
-                $writeList = array();
-
-                foreach($membership as $group) {
-
-                    $groupNode = $this->server->tree->getNodeForPath($group);
-
-                    // If the node is either ap proxy-read or proxy-write
-                    // group, we grab the parent principal and add it to the
-                    // list.
-                    if ($groupNode instanceof Principal\IProxyRead) {
-                        list($readList[]) = DAV\URLUtil::splitPath($group);
-                    }
-                    if ($groupNode instanceof Principal\IProxyWrite) {
-                        list($writeList[]) = DAV\URLUtil::splitPath($group);
-                    }
-
-                }
-                if (in_array($propRead,$requestedProperties)) {
-                    unset($requestedProperties[$propRead]);
-                    $returnedProperties[200][$propRead] = new DAV\Property\HrefList($readList);
-                }
-                if (in_array($propWrite,$requestedProperties)) {
-                    unset($requestedProperties[$propWrite]);
-                    $returnedProperties[200][$propWrite] = new DAV\Property\HrefList($writeList);
-                }
-
-            }
-
-            // notification-URL property
-            $notificationUrl = '{' . self::NS_CALENDARSERVER . '}notification-URL';
-            if (($index = array_search($notificationUrl, $requestedProperties)) !== false) {
-                $principalId = $node->getName();
-                $calendarHomePath = 'calendars/' . $principalId . '/notifications/';
-                unset($requestedProperties[$index]);
-                $returnedProperties[200][$notificationUrl] = new DAV\Property\Href($calendarHomePath);
-            }
-
-        } // instanceof IPrincipal
-
-        if ($node instanceof Notifications\INode) {
-
-            $propertyName = '{' . self::NS_CALENDARSERVER . '}notificationtype';
-            if (($index = array_search($propertyName, $requestedProperties)) !== false) {
-
-                $returnedProperties[200][$propertyName] =
-                    $node->getNotificationType();
-
-                unset($requestedProperties[$index]);
-
-            }
-
-        } // instanceof Notifications_INode
-
-
-        if ($node instanceof ICalendarObject) {
-            // The calendar-data property is not supposed to be a 'real'
-            // property, but in large chunks of the spec it does act as such.
-            // Therefore we simply expose it as a property.
-            $calDataProp = '{' . Plugin::NS_CALDAV . '}calendar-data';
-            if (in_array($calDataProp, $requestedProperties)) {
-                unset($requestedProperties[$calDataProp]);
-                $val = $node->get();
-                if (is_resource($val))
-                    $val = stream_get_contents($val);
-
-                // Taking out \r to not screw up the xml output
-                $returnedProperties[200][$calDataProp] = str_replace("\r","", $val);
-
-            }
-        }
-
-    }
-
-    /**
-     * This function handles the calendar-multiget REPORT.
-     *
-     * This report is used by the client to fetch the content of a series
-     * of urls. Effectively avoiding a lot of redundant requests.
-     *
-     * @param \DOMNode $dom
-     * @return void
-     */
-    public function calendarMultiGetReport($dom) {
-
-        $properties = array_keys(DAV\XMLUtil::parseProperties($dom->firstChild));
-        $hrefElems = $dom->getElementsByTagNameNS('urn:DAV','href');
-
-        $xpath = new \DOMXPath($dom);
-        $xpath->registerNameSpace('cal',Plugin::NS_CALDAV);
-        $xpath->registerNameSpace('dav','urn:DAV');
-
-        $expand = $xpath->query('/cal:calendar-multiget/dav:prop/cal:calendar-data/cal:expand');
-        if ($expand->length>0) {
-            $expandElem = $expand->item(0);
-            $start = $expandElem->getAttribute('start');
-            $end = $expandElem->getAttribute('end');
-            if(!$start || !$end) {
-                throw new DAV\Exception\BadRequest('The "start" and "end" attributes are required for the CALDAV:expand element');
-            }
-            $start = VObject\DateTimeParser::parseDateTime($start);
-            $end = VObject\DateTimeParser::parseDateTime($end);
-
-            if ($end <= $start) {
-                throw new DAV\Exception\BadRequest('The end-date must be larger than the start-date in the expand element.');
-            }
-
-            $expand = true;
-
-        } else {
-
-            $expand = false;
-
-        }
-
-        foreach($hrefElems as $elem) {
-            $uri = $this->server->calculateUri($elem->nodeValue);
-            list($objProps) = $this->server->getPropertiesForPath($uri,$properties);
-
-            if ($expand && isset($objProps[200]['{' . self::NS_CALDAV . '}calendar-data'])) {
-                $vObject = VObject\Reader::read($objProps[200]['{' . self::NS_CALDAV . '}calendar-data']);
-                $vObject->expand($start, $end);
-                $objProps[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
-            }
-
-            $propertyList[]=$objProps;
-
-        }
-
-        $prefer = $this->server->getHTTPPRefer();
-
-        $this->server->httpResponse->sendStatus(207);
-        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
-        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($propertyList, $prefer['return-minimal']));
-
-    }
-
-    /**
-     * This function handles the calendar-query REPORT
-     *
-     * This report is used by clients to request calendar objects based on
-     * complex conditions.
-     *
-     * @param \DOMNode $dom
-     * @return void
-     */
-    public function calendarQueryReport($dom) {
-
-        $parser = new CalendarQueryParser($dom);
-        $parser->parse();
-
-        $node = $this->server->tree->getNodeForPath($this->server->getRequestUri());
-        $depth = $this->server->getHTTPDepth(0);
-
-        // The default result is an empty array
-        $result = array();
-
-        // The calendarobject was requested directly. In this case we handle
-        // this locally.
-        if ($depth == 0 && $node instanceof ICalendarObject) {
-
-            $requestedCalendarData = true;
-            $requestedProperties = $parser->requestedProperties;
-
-            if (!in_array('{urn:ietf:params:xml:ns:caldav}calendar-data', $requestedProperties)) {
-
-                // We always retrieve calendar-data, as we need it for filtering.
-                $requestedProperties[] = '{urn:ietf:params:xml:ns:caldav}calendar-data';
-
-                // If calendar-data wasn't explicitly requested, we need to remove
-                // it after processing.
-                $requestedCalendarData = false;
-            }
-
-            $properties = $this->server->getPropertiesForPath(
-                $this->server->getRequestUri(),
-                $requestedProperties,
-                0
-            );
-
-            // This array should have only 1 element, the first calendar
-            // object.
-            $properties = current($properties);
-
-            // If there wasn't any calendar-data returned somehow, we ignore
-            // this.
-            if (isset($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data'])) {
-
-                $validator = new CalendarQueryValidator();
-
-                $vObject = VObject\Reader::read($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
-                if ($validator->validate($vObject,$parser->filters)) {
-
-                    // If the client didn't require the calendar-data property,
-                    // we won't give it back.
-                    if (!$requestedCalendarData) {
-                        unset($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
-                    } else {
-                        if ($parser->expand) {
-                            $vObject->expand($parser->expand['start'], $parser->expand['end']);
-                            $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
-                        }
-                    }
-
-                    $result = array($properties);
-
-                }
-
-            }
-
-        }
-        // If we're dealing with a calendar, the calendar itself is responsible
-        // for the calendar-query.
-        if ($node instanceof ICalendar && $depth = 1) {
-
-            $nodePaths = $node->calendarQuery($parser->filters);
-
-            foreach($nodePaths as $path) {
-
-                list($properties) =
-                    $this->server->getPropertiesForPath($this->server->getRequestUri() . '/' . $path, $parser->requestedProperties);
-
-                if ($parser->expand) {
-                    // We need to do some post-processing
-                    $vObject = VObject\Reader::read($properties[200]['{urn:ietf:params:xml:ns:caldav}calendar-data']);
-                    $vObject->expand($parser->expand['start'], $parser->expand['end']);
-                    $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
-                }
-
-                $result[] = $properties;
-
-            }
-
-        }
-
-        $prefer = $this->server->getHTTPPRefer();
-
-        $this->server->httpResponse->sendStatus(207);
-        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
-        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($result, $prefer['return-minimal']));
-
-    }
-
-    /**
-     * This method is responsible for parsing the request and generating the
-     * response for the CALDAV:free-busy-query REPORT.
-     *
-     * @param \DOMNode $dom
-     * @return void
-     */
-    protected function freeBusyQueryReport(\DOMNode $dom) {
-
-        $start = null;
-        $end = null;
-
-        foreach($dom->firstChild->childNodes as $childNode) {
-
-            $clark = DAV\XMLUtil::toClarkNotation($childNode);
-            if ($clark == '{' . self::NS_CALDAV . '}time-range') {
-                $start = $childNode->getAttribute('start');
-                $end = $childNode->getAttribute('end');
-                break;
-            }
-
-        }
-        if ($start) {
-            $start = VObject\DateTimeParser::parseDateTime($start);
-        }
-        if ($end) {
-            $end = VObject\DateTimeParser::parseDateTime($end);
-        }
-
-        if (!$start && !$end) {
-            throw new DAV\Exception\BadRequest('The freebusy report must have a time-range filter');
-        }
-        $acl = $this->server->getPlugin('acl');
-
-        if (!$acl) {
-            throw new DAV\Exception('The ACL plugin must be loaded for free-busy queries to work');
-        }
-        $uri = $this->server->getRequestUri();
-        $acl->checkPrivileges($uri,'{' . self::NS_CALDAV . '}read-free-busy');
-
-        $calendar = $this->server->tree->getNodeForPath($uri);
-        if (!$calendar instanceof ICalendar) {
-            throw new DAV\Exception\NotImplemented('The free-busy-query REPORT is only implemented on calendars');
-        }
-
-        // Doing a calendar-query first, to make sure we get the most
-        // performance.
-        $urls = $calendar->calendarQuery(array(
-            'name' => 'VCALENDAR',
-            'comp-filters' => array(
-                array(
-                    'name' => 'VEVENT',
-                    'comp-filters' => array(),
-                    'prop-filters' => array(),
-                    'is-not-defined' => false,
-                    'time-range' => array(
-                        'start' => $start,
-                        'end' => $end,
-                    ),
-                ),
-            ),
-            'prop-filters' => array(),
-            'is-not-defined' => false,
-            'time-range' => null,
-        ));
-
-        $objects = array_map(function($url) use ($calendar) {
-            $obj = $calendar->getChild($url)->get();
-            return $obj;
-        }, $urls);
-
-        $generator = new VObject\FreeBusyGenerator();
-        $generator->setObjects($objects);
-        $generator->setTimeRange($start, $end);
-        $result = $generator->getResult();
-        $result = $result->serialize();
-
-        $this->server->httpResponse->sendStatus(200);
-        $this->server->httpResponse->setHeader('Content-Type', 'text/calendar');
-        $this->server->httpResponse->setHeader('Content-Length', strlen($result));
-        $this->server->httpResponse->sendBody($result);
-
-    }
-
-    /**
-     * This method is triggered before a file gets updated with new content.
-     *
-     * This plugin uses this method to ensure that CalDAV objects receive
-     * valid calendar data.
-     *
-     * @param string $path
-     * @param DAV\IFile $node
-     * @param resource $data
-     * @return void
-     */
-    public function beforeWriteContent($path, DAV\IFile $node, &$data) {
-
-        if (!$node instanceof ICalendarObject)
-            return;
-
-        $this->validateICalendar($data, $path);
-
-    }
-
-    /**
-     * This method is triggered before a new file is created.
-     *
-     * This plugin uses this method to ensure that newly created calendar
-     * objects contain valid calendar data.
-     *
-     * @param string $path
-     * @param resource $data
-     * @param DAV\ICollection $parentNode
-     * @return void
-     */
-    public function beforeCreateFile($path, &$data, DAV\ICollection $parentNode) {
-
-        if (!$parentNode instanceof Calendar)
-            return;
-
-        $this->validateICalendar($data, $path);
-
-    }
-
-    /**
-     * This event is triggered before any HTTP request is handled.
-     *
-     * We use this to intercept GET calls to notification nodes, and return the
-     * proper response.
-     *
-     * @param string $method
-     * @param string $path
-     * @return void
-     */
-    public function beforeMethod($method, $path) {
-
-        if ($method!=='GET') return;
-
-        try {
-            $node = $this->server->tree->getNodeForPath($path);
-        } catch (DAV\Exception\NotFound $e) {
-            return;
-        }
-
-        if (!$node instanceof Notifications\INode)
-            return;
-
-        if (!$this->server->checkPreconditions(true)) return false;
-        $dom = new \DOMDocument('1.0', 'UTF-8');
-
-        $dom->formatOutput = true;
-
-        $root = $dom->createElement('cs:notification');
-        foreach($this->server->xmlNamespaces as $namespace => $prefix) {
-            $root->setAttribute('xmlns:' . $prefix, $namespace);
-        }
-
-        $dom->appendChild($root);
-        $node->getNotificationType()->serializeBody($this->server, $root);
-
-        $this->server->httpResponse->setHeader('Content-Type','application/xml');
-        $this->server->httpResponse->setHeader('ETag',$node->getETag());
-        $this->server->httpResponse->sendStatus(200);
-        $this->server->httpResponse->sendBody($dom->saveXML());
-
-        return false;
-
-    }
-
-    /**
-     * Checks if the submitted iCalendar data is in fact, valid.
-     *
-     * An exception is thrown if it's not.
-     *
-     * @param resource|string $data
-     * @param string $path
-     * @return void
-     */
-    protected function validateICalendar(&$data, $path) {
-
-        // If it's a stream, we convert it to a string first.
-        if (is_resource($data)) {
-            $data = stream_get_contents($data);
-        }
-
-        // Converting the data to unicode, if needed.
-        $data = DAV\StringUtil::ensureUTF8($data);
-
-        try {
-
-            $vobj = VObject\Reader::read($data);
-
-        } catch (VObject\ParseException $e) {
-
-            throw new DAV\Exception\UnsupportedMediaType('This resource only supports valid iCalendar 2.0 data. Parse error: ' . $e->getMessage());
-
-        }
-
-        if ($vobj->name !== 'VCALENDAR') {
-            throw new DAV\Exception\UnsupportedMediaType('This collection can only support iCalendar objects.');
-        }
-
-        // Get the Supported Components for the target calendar
-        list($parentPath,$object) = DAV\URLUtil::splitPath($path);
-        $calendarProperties = $this->server->getProperties($parentPath,array('{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set'));
-        $supportedComponents = $calendarProperties['{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set']->getValue();
-
-        $foundType = null;
-        $foundUID = null;
-        foreach($vobj->getComponents() as $component) {
-            switch($component->name) {
-                case 'VTIMEZONE' :
-                    continue 2;
-                case 'VEVENT' :
-                case 'VTODO' :
-                case 'VJOURNAL' :
-                    if (is_null($foundType)) {
-                        $foundType = $component->name;
-                        if (!in_array($foundType, $supportedComponents)) {
-                            throw new Exception\InvalidComponentType('This calendar only supports ' . implode(', ', $supportedComponents) . '. We found a ' . $foundType);
-                        }
-                        if (!isset($component->UID)) {
-                            throw new DAV\Exception\BadRequest('Every ' . $component->name . ' component must have an UID');
-                        }
-                        $foundUID = (string)$component->UID;
-                    } else {
-                        if ($foundType !== $component->name) {
-                            throw new DAV\Exception\BadRequest('A calendar object must only contain 1 component. We found a ' . $component->name . ' as well as a ' . $foundType);
-                        }
-                        if ($foundUID !== (string)$component->UID) {
-                            throw new DAV\Exception\BadRequest('Every ' . $component->name . ' in this object must have identical UIDs');
-                        }
-                    }
-                    break;
-                default :
-                    throw new DAV\Exception\BadRequest('You are not allowed to create components of type: ' . $component->name . ' here');
-
-            }
-        }
-        if (!$foundType)
-            throw new DAV\Exception\BadRequest('iCalendar object must contain at least 1 of VEVENT, VTODO or VJOURNAL');
-
-    }
-
-    /**
-     * This method handles POST requests to the schedule-outbox.
-     *
-     * Currently, two types of requests are support:
-     *   * FREEBUSY requests from RFC 6638
-     *   * Simple iTIP messages from draft-desruisseaux-caldav-sched-04
-     *
-     * The latter is from an expired early draft of the CalDAV scheduling
-     * extensions, but iCal depends on a feature from that spec, so we
-     * implement it.
-     *
-     * @param Schedule\IOutbox $outboxNode
-     * @param string $outboxUri
-     * @return void
-     */
-    public function outboxRequest(Schedule\IOutbox $outboxNode, $outboxUri) {
-
-        // Parsing the request body
-        try {
-            $vObject = VObject\Reader::read($this->server->httpRequest->getBody(true));
-        } catch (VObject\ParseException $e) {
-            throw new DAV\Exception\BadRequest('The request body must be a valid iCalendar object. Parse error: ' . $e->getMessage());
-        }
-
-        // The incoming iCalendar object must have a METHOD property, and a
-        // component. The combination of both determines what type of request
-        // this is.
-        $componentType = null;
-        foreach($vObject->getComponents() as $component) {
-            if ($component->name !== 'VTIMEZONE') {
-                $componentType = $component->name;
-                break;
-            }
-        }
-        if (is_null($componentType)) {
-            throw new DAV\Exception\BadRequest('We expected at least one VTODO, VJOURNAL, VFREEBUSY or VEVENT component');
-        }
-
-        // Validating the METHOD
-        $method = strtoupper((string)$vObject->METHOD);
-        if (!$method) {
-            throw new DAV\Exception\BadRequest('A METHOD property must be specified in iTIP messages');
-        }
-
-        // So we support two types of requests:
-        //
-        // REQUEST with a VFREEBUSY component
-        // REQUEST, REPLY, ADD, CANCEL on VEVENT components
-
-        $acl = $this->server->getPlugin('acl');
-
-        if ($componentType === 'VFREEBUSY' && $method === 'REQUEST') {
-
-            $acl && $acl->checkPrivileges($outboxUri,'{' . Plugin::NS_CALDAV . '}schedule-query-freebusy');
-            $this->handleFreeBusyRequest($outboxNode, $vObject);
-
-        } elseif ($componentType === 'VEVENT' && in_array($method, array('REQUEST','REPLY','ADD','CANCEL'))) {
-
-            $acl && $acl->checkPrivileges($outboxUri,'{' . Plugin::NS_CALDAV . '}schedule-post-vevent');
-            $this->handleEventNotification($outboxNode, $vObject);
-
-        } else {
-
-            throw new DAV\Exception\NotImplemented('SabreDAV supports only VFREEBUSY (REQUEST) and VEVENT (REQUEST, REPLY, ADD, CANCEL)');
-
-        }
-
-    }
-
-    /**
-     * This method handles the REQUEST, REPLY, ADD and CANCEL methods for
-     * VEVENT iTip messages.
-     *
-     * @return void
-     */
-    protected function handleEventNotification(Schedule\IOutbox $outboxNode, VObject\Component $vObject) {
-
-        $originator = $this->server->httpRequest->getHeader('Originator');
-        $recipients = $this->server->httpRequest->getHeader('Recipient');
-
-        if (!$originator) {
-            throw new DAV\Exception\BadRequest('The Originator: header must be specified when making POST requests');
-        }
-        if (!$recipients) {
-            throw new DAV\Exception\BadRequest('The Recipient: header must be specified when making POST requests');
-        }
-
-        $recipients = explode(',',$recipients);
-        foreach($recipients as $k=>$recipient) {
-
-            $recipient = trim($recipient);
-            if (!preg_match('/^mailto:(.*)@(.*)$/i', $recipient)) {
-                throw new DAV\Exception\BadRequest('Recipients must start with mailto: and must be valid email address');
-            }
-            $recipient = substr($recipient, 7);
-            $recipients[$k] = $recipient;
-        }
-
-        // We need to make sure that 'originator' matches one of the email
-        // addresses of the selected principal.
-        $principal = $outboxNode->getOwner();
-        $props = $this->server->getProperties($principal,array(
-            '{' . self::NS_CALDAV . '}calendar-user-address-set',
-        ));
-
-        $addresses = array();
-        if (isset($props['{' . self::NS_CALDAV . '}calendar-user-address-set'])) {
-            $addresses = $props['{' . self::NS_CALDAV . '}calendar-user-address-set']->getHrefs();
-        }
-
-        $found = false;
-        foreach($addresses as $address) {
-
-            // Trimming the / on both sides, just in case..
-            if (rtrim(strtolower($originator),'/') === rtrim(strtolower($address),'/')) {
-                $found = true;
-                break;
-            }
-
-        }
-
-        if (!$found) {
-            throw new DAV\Exception\Forbidden('The addresses specified in the Originator header did not match any addresses in the owners calendar-user-address-set header');
-        }
-
-        // If the Originator header was a url, and not a mailto: address..
-        // we're going to try to pull the mailto: from the vobject body.
-        if (strtolower(substr($originator,0,7)) !== 'mailto:') {
-            $originator = (string)$vObject->VEVENT->ORGANIZER;
-
-        }
-        if (strtolower(substr($originator,0,7)) !== 'mailto:') {
-            throw new DAV\Exception\Forbidden('Could not find mailto: address in both the Orignator header, and the ORGANIZER property in the VEVENT');
-        }
-        $originator = substr($originator,7);
-
-        $result = $this->iMIPMessage($originator, $recipients, $vObject, $principal);
-        $this->server->httpResponse->sendStatus(200);
-        $this->server->httpResponse->setHeader('Content-Type','application/xml');
-        $this->server->httpResponse->sendBody($this->generateScheduleResponse($result));
-
-    }
-
-    /**
-     * Sends an iMIP message by email.
-     *
-     * This method must return an array with status codes per recipient.
-     * This should look something like:
-     *
-     * array(
-     *    'user1@example.org' => '2.0;Success'
-     * )
-     *
-     * Formatting for this status code can be found at:
-     * https://tools.ietf.org/html/rfc5545#section-3.8.8.3
-     *
-     * A list of valid status codes can be found at:
-     * https://tools.ietf.org/html/rfc5546#section-3.6
-     *
-     * @param string $originator
-     * @param array $recipients
-     * @param VObject\Component $vObject
-     * @param string $principal Principal url
-     * @return array 
-     */
-    protected function iMIPMessage($originator, array $recipients, VObject\Component $vObject, $principal) {
-
-        if (!$this->imipHandler) {
-            $resultStatus = '5.2;This server does not support this operation';
-        } else {
-            $this->imipHandler->sendMessage($originator, $recipients, $vObject, $principal);
-            $resultStatus = '2.0;Success';
-        }
-
-        $result = array();
-        foreach($recipients as $recipient) {
-            $result[$recipient] = $resultStatus;
-        }
-
-        return $result;
-
-    }
-
-    /**
-     * Generates a schedule-response XML body
-     *
-     * The recipients array is a key->value list, containing email addresses
-     * and iTip status codes. See the iMIPMessage method for a description of
-     * the value.
-     *
-     * @param array $recipients
-     * @return string
-     */
-    public function generateScheduleResponse(array $recipients) {
-
-        $dom = new \DOMDocument('1.0','utf-8');
-        $dom->formatOutput = true;
-        $xscheduleResponse = $dom->createElement('cal:schedule-response');
-        $dom->appendChild($xscheduleResponse);
-
-        foreach($this->server->xmlNamespaces as $namespace=>$prefix) {
-
-            $xscheduleResponse->setAttribute('xmlns:' . $prefix, $namespace);
-
-        }
-
-        foreach($recipients as $recipient=>$status) {
-            $xresponse = $dom->createElement('cal:response');
-
-            $xrecipient = $dom->createElement('cal:recipient');
-            $xrecipient->appendChild($dom->createTextNode($recipient));
-            $xresponse->appendChild($xrecipient);
-
-            $xrequestStatus = $dom->createElement('cal:request-status');
-            $xrequestStatus->appendChild($dom->createTextNode($status));
-            $xresponse->appendChild($xrequestStatus);
-
-            $xscheduleResponse->appendChild($xresponse);
-
-        }
-
-        return $dom->saveXML();
-
-    }
-
-    /**
-     * This method is responsible for parsing a free-busy query request and
-     * returning it's result.
-     *
-     * @param Schedule\IOutbox $outbox
-     * @param string $request
-     * @return string
-     */
-    protected function handleFreeBusyRequest(Schedule\IOutbox $outbox, VObject\Component $vObject) {
-
-        $vFreeBusy = $vObject->VFREEBUSY;
-        $organizer = $vFreeBusy->organizer;
-
-        $organizer = (string)$organizer;
-
-        // Validating if the organizer matches the owner of the inbox.
-        $owner = $outbox->getOwner();
-
-        $caldavNS = '{' . Plugin::NS_CALDAV . '}';
-
-        $uas = $caldavNS . 'calendar-user-address-set';
-        $props = $this->server->getProperties($owner,array($uas));
-
-        if (empty($props[$uas]) || !in_array($organizer, $props[$uas]->getHrefs())) {
-            throw new DAV\Exception\Forbidden('The organizer in the request did not match any of the addresses for the owner of this inbox');
-        }
-
-        if (!isset($vFreeBusy->ATTENDEE)) {
-            throw new DAV\Exception\BadRequest('You must at least specify 1 attendee');
-        }
-
-        $attendees = array();
-        foreach($vFreeBusy->ATTENDEE as $attendee) {
-            $attendees[]= (string)$attendee;
-        }
-
-
-        if (!isset($vFreeBusy->DTSTART) || !isset($vFreeBusy->DTEND)) {
-            throw new DAV\Exception\BadRequest('DTSTART and DTEND must both be specified');
-        }
-
-        $startRange = $vFreeBusy->DTSTART->getDateTime();
-        $endRange = $vFreeBusy->DTEND->getDateTime();
-
-        $results = array();
-        foreach($attendees as $attendee) {
-            $results[] = $this->getFreeBusyForEmail($attendee, $startRange, $endRange, $vObject);
-        }
-
-        $dom = new \DOMDocument('1.0','utf-8');
-        $dom->formatOutput = true;
-        $scheduleResponse = $dom->createElement('cal:schedule-response');
-        foreach($this->server->xmlNamespaces as $namespace=>$prefix) {
-
-            $scheduleResponse->setAttribute('xmlns:' . $prefix,$namespace);
-
-        }
-        $dom->appendChild($scheduleResponse);
-
-        foreach($results as $result) {
-            $response = $dom->createElement('cal:response');
-
-            $recipient = $dom->createElement('cal:recipient');
-            $recipientHref = $dom->createElement('d:href');
-
-            $recipientHref->appendChild($dom->createTextNode($result['href']));
-            $recipient->appendChild($recipientHref);
-            $response->appendChild($recipient);
-
-            $reqStatus = $dom->createElement('cal:request-status');
-            $reqStatus->appendChild($dom->createTextNode($result['request-status']));
-            $response->appendChild($reqStatus);
-
-            if (isset($result['calendar-data'])) {
-
-                $calendardata = $dom->createElement('cal:calendar-data');
-                $calendardata->appendChild($dom->createTextNode(str_replace("\r\n","\n",$result['calendar-data']->serialize())));
-                $response->appendChild($calendardata);
-
-            }
-            $scheduleResponse->appendChild($response);
-        }
-
-        $this->server->httpResponse->sendStatus(200);
-        $this->server->httpResponse->setHeader('Content-Type','application/xml');
-        $this->server->httpResponse->sendBody($dom->saveXML());
-
-    }
-
-    /**
-     * Returns free-busy information for a specific address. The returned
-     * data is an array containing the following properties:
-     *
-     * calendar-data : A VFREEBUSY VObject
-     * request-status : an iTip status code.
-     * href: The principal's email address, as requested
-     *
-     * The following request status codes may be returned:
-     *   * 2.0;description
-     *   * 3.7;description
-     *
-     * @param string $email address
-     * @param \DateTime $start
-     * @param \DateTime $end
-     * @param VObject\Component $request
-     * @return array
-     */
-    protected function getFreeBusyForEmail($email, \DateTime $start, \DateTime $end, VObject\Component $request) {
-
-        $caldavNS = '{' . Plugin::NS_CALDAV . '}';
-
-        $aclPlugin = $this->server->getPlugin('acl');
-        if (substr($email,0,7)==='mailto:') $email = substr($email,7);
-
-        $result = $aclPlugin->principalSearch(
-            array('{http://sabredav.org/ns}email-address' => $email),
-            array(
-                '{DAV:}principal-URL', $caldavNS . 'calendar-home-set',
-                '{http://sabredav.org/ns}email-address',
-            )
-        );
-
-        if (!count($result)) {
-            return array(
-                'request-status' => '3.7;Could not find principal',
-                'href' => 'mailto:' . $email,
-            );
-        }
-
-        if (!isset($result[0][200][$caldavNS . 'calendar-home-set'])) {
-            return array(
-                'request-status' => '3.7;No calendar-home-set property found',
-                'href' => 'mailto:' . $email,
-            );
-        }
-        $homeSet = $result[0][200][$caldavNS . 'calendar-home-set']->getHref();
-
-        // Grabbing the calendar list
-        $objects = array();
-        foreach($this->server->tree->getNodeForPath($homeSet)->getChildren() as $node) {
-            if (!$node instanceof ICalendar) {
-                continue;
-            }
-            $aclPlugin->checkPrivileges($homeSet . $node->getName() ,$caldavNS . 'read-free-busy');
-
-            // Getting the list of object uris within the time-range
-            $urls = $node->calendarQuery(array(
-                'name' => 'VCALENDAR',
-                'comp-filters' => array(
-                    array(
-                        'name' => 'VEVENT',
-                        'comp-filters' => array(),
-                        'prop-filters' => array(),
-                        'is-not-defined' => false,
-                        'time-range' => array(
-                            'start' => $start,
-                            'end' => $end,
-                        ),
-                    ),
-                ),
-                'prop-filters' => array(),
-                'is-not-defined' => false,
-                'time-range' => null,
-            ));
-
-            $calObjects = array_map(function($url) use ($node) {
-                $obj = $node->getChild($url)->get();
-                return $obj;
-            }, $urls);
-
-            $objects = array_merge($objects,$calObjects);
-
-        }
-
-        $vcalendar = new VObject\Component\VCalendar();
-        $vcalendar->VERSION = '2.0';
-        $vcalendar->METHOD = 'REPLY';
-        $vcalendar->CALSCALE = 'GREGORIAN';
-        $vcalendar->PRODID = '-//SabreDAV//SabreDAV ' . DAV\Version::VERSION . '//EN';
-
-        $generator = new VObject\FreeBusyGenerator();
-        $generator->setObjects($objects);
-        $generator->setTimeRange($start, $end);
-        $generator->setBaseObject($vcalendar);
-
-        $result = $generator->getResult();
-
-        $vcalendar->VFREEBUSY->ATTENDEE = 'mailto:' . $email;
-        $vcalendar->VFREEBUSY->UID = (string)$request->VFREEBUSY->UID;
-        $vcalendar->VFREEBUSY->ORGANIZER = clone $request->VFREEBUSY->ORGANIZER;
-
-        return array(
-            'calendar-data' => $result,
-            'request-status' => '2.0;Success',
-            'href' => 'mailto:' . $email,
-        );
-    }
-
-    /**
-     * This method is used to generate HTML output for the
-     * DAV\Browser\Plugin. This allows us to generate an interface users
-     * can use to create new calendars.
-     *
-     * @param DAV\INode $node
-     * @param string $output
-     * @return bool
-     */
-    public function htmlActionsPanel(DAV\INode $node, &$output) {
-
-        if (!$node instanceof UserCalendars)
-            return;
-
-        $output.= '<tr><td colspan="2"><form method="post" action="">
-            <h3>Create new calendar</h3>
-            <input type="hidden" name="sabreAction" value="mkcalendar" />
-            <label>Name (uri):</label> <input type="text" name="name" /><br />
-            <label>Display name:</label> <input type="text" name="{DAV:}displayname" /><br />
-            <input type="submit" value="create" />
-            </form>
-            </td></tr>';
-
-        return false;
-
-    }
-
-    /**
-     * This method allows us to intercept the 'mkcalendar' sabreAction. This
-     * action enables the user to create new calendars from the browser plugin.
-     *
-     * @param string $uri
-     * @param string $action
-     * @param array $postVars
-     * @return bool
-     */
-    public function browserPostAction($uri, $action, array $postVars) {
-
-        if ($action!=='mkcalendar')
-            return;
-
-        $resourceType = array('{DAV:}collection','{urn:ietf:params:xml:ns:caldav}calendar');
-        $properties = array();
-        if (isset($postVars['{DAV:}displayname'])) {
-            $properties['{DAV:}displayname'] = $postVars['{DAV:}displayname'];
-        }
-        $this->server->createCollection($uri . '/' . $postVars['name'],$resourceType,$properties);
-        return false;
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/AllowedSharingModes.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Property/AllowedSharingModes.php
deleted file mode 100644
index ca8312d40..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/AllowedSharingModes.php
+++ /dev/null
@@ -1,74 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV\Property;
-
-use Sabre\DAV;
-
-/**
- * AllowedSharingModes
- *
- * This property encodes the 'allowed-sharing-modes' property, as defined by
- * the 'caldav-sharing-02' spec, in the http://calendarserver.org/ns/
- * namespace.
- *
- * This property is a representation of the supported-calendar_component-set
- * property in the CalDAV namespace. It simply requires an array of components,
- * such as VEVENT, VTODO
- *
- * @see https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/caldav-sharing-02.txt
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class AllowedSharingModes extends DAV\Property {
-
-    /**
-     * Whether or not a calendar can be shared with another user
-     *
-     * @var bool
-     */
-    protected $canBeShared;
-
-    /**
-     * Whether or not the calendar can be placed on a public url.
-     *
-     * @var bool
-     */
-    protected $canBePublished;
-
-    /**
-     * Constructor
-     *
-     * @param bool $canBeShared
-     * @param bool $canBePublished
-     * @return void
-     */
-    public function __construct($canBeShared, $canBePublished) {
-
-        $this->canBeShared = $canBeShared;
-        $this->canBePublished = $canBePublished;
-
-    }
-
-    /**
-     * Serializes the property in a DOMDocument
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server, \DOMElement $node) {
-
-       $doc = $node->ownerDocument;
-       if ($this->canBeShared) {
-            $xcomp = $doc->createElement('cs:can-be-shared');
-            $node->appendChild($xcomp);
-       }
-       if ($this->canBePublished) {
-            $xcomp = $doc->createElement('cs:can-be-published');
-            $node->appendChild($xcomp);
-       }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/Invite.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Property/Invite.php
deleted file mode 100644
index 86ef69e80..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/Invite.php
+++ /dev/null
@@ -1,227 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV\Property;
-
-use Sabre\CalDAV\SharingPlugin as SharingPlugin;
-use Sabre\DAV;
-use Sabre\CalDAV;
-
-/**
- * Invite property
- *
- * This property encodes the 'invite' property, as defined by
- * the 'caldav-sharing-02' spec, in the http://calendarserver.org/ns/
- * namespace.
- *
- * @see https://trac.calendarserver.org/browser/CalendarServer/trunk/doc/Extensions/caldav-sharing-02.txt
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Invite extends DAV\Property {
-
-    /**
-     * The list of users a calendar has been shared to.
-     *
-     * @var array
-     */
-    protected $users;
-
-    /**
-     * The organizer contains information about the person who shared the
-     * object.
-     *
-     * @var array
-     */
-    protected $organizer;
-
-    /**
-     * Creates the property.
-     *
-     * Users is an array. Each element of the array has the following
-     * properties:
-     *
-     *   * href - Often a mailto: address
-     *   * commonName - Optional, for example a first and lastname for a user.
-     *   * status - One of the SharingPlugin::STATUS_* constants.
-     *   * readOnly - true or false
-     *   * summary - Optional, description of the share
-     *
-     * The organizer key is optional to specify. It's only useful when a
-     * 'sharee' requests the sharing information.
-     *
-     * The organizer may have the following properties:
-     *   * href - Often a mailto: address.
-     *   * commonName - Optional human-readable name.
-     *   * firstName - Optional first name.
-     *   * lastName - Optional last name.
-     *
-     * If you wonder why these two structures are so different, I guess a
-     * valid answer is that the current spec is still a draft.
-     *
-     * @param array $users
-     */
-    public function __construct(array $users, array $organizer = null) {
-
-        $this->users = $users;
-        $this->organizer = $organizer;
-
-    }
-
-    /**
-     * Returns the list of users, as it was passed to the constructor.
-     *
-     * @return array
-     */
-    public function getValue() {
-
-        return $this->users;
-
-    }
-
-    /**
-     * Serializes the property in a DOMDocument
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $node) {
-
-       $doc = $node->ownerDocument;
-
-       if (!is_null($this->organizer)) {
-
-           $xorganizer = $doc->createElement('cs:organizer');
-
-           $href = $doc->createElement('d:href');
-           $href->appendChild($doc->createTextNode($this->organizer['href']));
-           $xorganizer->appendChild($href);
-
-           if (isset($this->organizer['commonName']) && $this->organizer['commonName']) {
-               $commonName = $doc->createElement('cs:common-name');
-               $commonName->appendChild($doc->createTextNode($this->organizer['commonName']));
-               $xorganizer->appendChild($commonName);
-           }
-           if (isset($this->organizer['firstName']) && $this->organizer['firstName']) {
-               $firstName = $doc->createElement('cs:first-name');
-               $firstName->appendChild($doc->createTextNode($this->organizer['firstName']));
-               $xorganizer->appendChild($firstName);
-           }
-           if (isset($this->organizer['lastName']) && $this->organizer['lastName']) {
-               $lastName = $doc->createElement('cs:last-name');
-               $lastName->appendChild($doc->createTextNode($this->organizer['lastName']));
-               $xorganizer->appendChild($lastName);
-           }
-
-           $node->appendChild($xorganizer);
-
-
-       }
-
-       foreach($this->users as $user) {
-
-           $xuser = $doc->createElement('cs:user');
-
-           $href = $doc->createElement('d:href');
-           $href->appendChild($doc->createTextNode($user['href']));
-           $xuser->appendChild($href);
-
-           if (isset($user['commonName']) && $user['commonName']) {
-               $commonName = $doc->createElement('cs:common-name');
-               $commonName->appendChild($doc->createTextNode($user['commonName']));
-               $xuser->appendChild($commonName);
-           }
-
-           switch($user['status']) {
-
-               case SharingPlugin::STATUS_ACCEPTED :
-                   $status = $doc->createElement('cs:invite-accepted');
-                   $xuser->appendChild($status);
-                   break;
-               case SharingPlugin::STATUS_DECLINED :
-                   $status = $doc->createElement('cs:invite-declined');
-                   $xuser->appendChild($status);
-                   break;
-               case SharingPlugin::STATUS_NORESPONSE :
-                   $status = $doc->createElement('cs:invite-noresponse');
-                   $xuser->appendChild($status);
-                   break;
-               case SharingPlugin::STATUS_INVALID :
-                   $status = $doc->createElement('cs:invite-invalid');
-                   $xuser->appendChild($status);
-                   break;
-
-           }
-
-           $xaccess = $doc->createElement('cs:access');
-
-           if ($user['readOnly']) {
-                $xaccess->appendChild(
-                    $doc->createElement('cs:read')
-                );
-           } else {
-                $xaccess->appendChild(
-                    $doc->createElement('cs:read-write')
-                );
-           }
-           $xuser->appendChild($xaccess);
-
-           if (isset($user['summary']) && $user['summary']) {
-               $summary = $doc->createElement('cs:summary');
-               $summary->appendChild($doc->createTextNode($user['summary']));
-               $xuser->appendChild($summary);
-           }
-
-           $node->appendChild($xuser);
-
-       }
-
-
-    }
-
-    /**
-     * Unserializes the property.
-     *
-     * This static method should return a an instance of this object.
-     *
-     * @param \DOMElement $prop
-     * @return DAV\IProperty
-     */
-    static function unserialize(\DOMElement $prop) {
-
-        $xpath = new \DOMXPath($prop->ownerDocument);
-        $xpath->registerNamespace('cs', CalDAV\Plugin::NS_CALENDARSERVER);
-        $xpath->registerNamespace('d',  'urn:DAV');
-
-        $users = array();
-
-        foreach($xpath->query('cs:user', $prop) as $user) {
-
-            $status = null;
-            if ($xpath->evaluate('boolean(cs:invite-accepted)', $user)) {
-                $status = SharingPlugin::STATUS_ACCEPTED;
-            } elseif ($xpath->evaluate('boolean(cs:invite-declined)', $user)) {
-                $status = SharingPlugin::STATUS_DECLINED;
-            } elseif ($xpath->evaluate('boolean(cs:invite-noresponse)', $user)) {
-                $status = SharingPlugin::STATUS_NORESPONSE;
-            } elseif ($xpath->evaluate('boolean(cs:invite-invalid)', $user)) {
-                $status = SharingPlugin::STATUS_INVALID;
-            } else {
-                throw new DAV\Exception('Every cs:user property must have one of cs:invite-accepted, cs:invite-declined, cs:invite-noresponse or cs:invite-invalid');
-            }
-            $users[] = array(
-                'href' => $xpath->evaluate('string(d:href)', $user),
-                'commonName' => $xpath->evaluate('string(cs:common-name)', $user),
-                'readOnly' => $xpath->evaluate('boolean(cs:access/cs:read)', $user),
-                'summary' => $xpath->evaluate('string(cs:summary)', $user),
-                'status' => $status,
-            );
-
-        }
-
-        return new self($users);
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/ScheduleCalendarTransp.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Property/ScheduleCalendarTransp.php
deleted file mode 100644
index 7f12d7585..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/ScheduleCalendarTransp.php
+++ /dev/null
@@ -1,102 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV\Property;
-
-use Sabre\DAV;
-use Sabre\CalDAV;
-
-/**
- * schedule-calendar-transp property.
- *
- * This property is a representation of the schedule-calendar-transp property.
- * This property is defined in RFC6638 (caldav scheduling).
- *
- * Its values are either 'transparent' or 'opaque'. If it's transparent, it
- * means that this calendar will not be taken into consideration when a
- * different user queries for free-busy information. If it's 'opaque', it will.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class ScheduleCalendarTransp extends DAV\Property {
-
-    const TRANSPARENT = 'transparent';
-    const OPAQUE = 'opaque';
-
-    protected $value;
-
-    /**
-     * Creates the property
-     *
-     * @param string $value
-     */
-    public function __construct($value) {
-
-        if ($value !== self::TRANSPARENT && $value !== self::OPAQUE) {
-            throw new \InvalidArgumentException('The value must either be specified as "transparent" or "opaque"');
-        }
-        $this->value = $value;
-
-    }
-
-    /**
-     * Returns the current value
-     *
-     * @return string
-     */
-    public function getValue() {
-
-        return $this->value;
-
-    }
-
-    /**
-     * Serializes the property in a DOMDocument
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $node) {
-
-        $doc = $node->ownerDocument;
-        switch($this->value) {
-            case self::TRANSPARENT :
-                $xval = $doc->createElement('cal:transparent');
-                break;
-            case self::OPAQUE :
-                $xval = $doc->createElement('cal:opaque');
-                break;
-        }
-
-        $node->appendChild($xval);
-
-    }
-
-    /**
-     * Unserializes the DOMElement back into a Property class.
-     *
-     * @param \DOMElement $node
-     * @return ScheduleCalendarTransp
-     */
-    static function unserialize(\DOMElement $node) {
-
-        $value = null;
-        foreach($node->childNodes as $childNode) {
-            switch(DAV\XMLUtil::toClarkNotation($childNode)) {
-                case '{' . CalDAV\Plugin::NS_CALDAV . '}opaque' :
-                    $value = self::OPAQUE;
-                    break;
-                case '{' . CalDAV\Plugin::NS_CALDAV . '}transparent' :
-                    $value = self::TRANSPARENT;
-                    break;
-            }
-        }
-        if (is_null($value))
-           return null;
-
-        return new self($value);
-
-    }
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/SupportedCalendarComponentSet.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Property/SupportedCalendarComponentSet.php
deleted file mode 100644
index 2538fa45d..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/SupportedCalendarComponentSet.php
+++ /dev/null
@@ -1,88 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV\Property;
-
-use Sabre\DAV;
-use Sabre\CalDAV;
-
-/**
- * Supported component set property
- *
- * This property is a representation of the supported-calendar_component-set
- * property in the CalDAV namespace. It simply requires an array of components,
- * such as VEVENT, VTODO
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class SupportedCalendarComponentSet extends DAV\Property {
-
-    /**
-     * List of supported components, such as "VEVENT, VTODO"
-     *
-     * @var array
-     */
-    private $components;
-
-    /**
-     * Creates the property
-     *
-     * @param array $components
-     */
-    public function __construct(array $components) {
-
-       $this->components = $components;
-
-    }
-
-    /**
-     * Returns the list of supported components
-     *
-     * @return array
-     */
-    public function getValue() {
-
-        return $this->components;
-
-    }
-
-    /**
-     * Serializes the property in a DOMDocument
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $node) {
-
-       $doc = $node->ownerDocument;
-       foreach($this->components as $component) {
-
-            $xcomp = $doc->createElement('cal:comp');
-            $xcomp->setAttribute('name',$component);
-            $node->appendChild($xcomp);
-
-       }
-
-    }
-
-    /**
-     * Unserializes the DOMElement back into a Property class.
-     *
-     * @param \DOMElement $node
-     * @return Property_SupportedCalendarComponentSet
-     */
-    static function unserialize(\DOMElement $node) {
-
-        $components = array();
-        foreach($node->childNodes as $childNode) {
-            if (DAV\XMLUtil::toClarkNotation($childNode)==='{' . CalDAV\Plugin::NS_CALDAV . '}comp') {
-                $components[] = $childNode->getAttribute('name');
-            }
-        }
-        return new self($components);
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/SupportedCalendarData.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Property/SupportedCalendarData.php
deleted file mode 100644
index efab80a91..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/SupportedCalendarData.php
+++ /dev/null
@@ -1,40 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV\Property;
-use Sabre\DAV;
-use Sabre\CalDAV\Plugin;
-
-/**
- * Supported-calendar-data property
- *
- * This property is a representation of the supported-calendar-data property
- * in the CalDAV namespace. SabreDAV only has support for text/calendar;2.0
- * so the value is currently hardcoded.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class SupportedCalendarData extends DAV\Property {
-
-    /**
-     * Serializes the property in a DOMDocument
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $node) {
-
-        $doc = $node->ownerDocument;
-
-        $prefix = isset($server->xmlNamespaces[Plugin::NS_CALDAV])?$server->xmlNamespaces[Plugin::NS_CALDAV]:'cal';
-
-        $caldata = $doc->createElement($prefix . ':calendar-data');
-        $caldata->setAttribute('content-type','text/calendar');
-        $caldata->setAttribute('version','2.0');
-
-        $node->appendChild($caldata);
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/SupportedCollationSet.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Property/SupportedCollationSet.php
deleted file mode 100644
index 63c37fe5a..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Property/SupportedCollationSet.php
+++ /dev/null
@@ -1,45 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV\Property;
-use Sabre\DAV;
-
-/**
- * supported-collation-set property
- *
- * This property is a representation of the supported-collation-set property
- * in the CalDAV namespace.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class SupportedCollationSet extends DAV\Property {
-
-    /**
-     * Serializes the property in a DOM document
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $node) {
-
-        $doc = $node->ownerDocument;
-
-        $prefix = $node->lookupPrefix('urn:ietf:params:xml:ns:caldav');
-        if (!$prefix) $prefix = 'cal';
-
-        $node->appendChild(
-            $doc->createElement($prefix . ':supported-collation','i;ascii-casemap')
-        );
-        $node->appendChild(
-            $doc->createElement($prefix . ':supported-collation','i;octet')
-        );
-        $node->appendChild(
-            $doc->createElement($prefix . ':supported-collation','i;unicode-casemap')
-        );
-
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Schedule/IMip.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Schedule/IMip.php
deleted file mode 100644
index b2b0d98b1..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Schedule/IMip.php
+++ /dev/null
@@ -1,111 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV\Schedule;
-
-use Sabre\VObject;
-use Sabre\DAV;
-
-/**
- * iMIP handler.
- *
- * This class is responsible for sending out iMIP messages. iMIP is the
- * email-based transport for iTIP. iTIP deals with scheduling operations for
- * iCalendar objects.
- *
- * If you want to customize the email that gets sent out, you can do so by
- * extending this class and overriding the sendMessage method.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class IMip {
-
-    /**
-     * Email address used in From: header.
-     *
-     * @var string
-     */
-    protected $senderEmail;
-
-    /**
-     * Creates the email handler.
-     *
-     * @param string $senderEmail. The 'senderEmail' is the email that shows up
-     *                             in the 'From:' address. This should
-     *                             generally be some kind of no-reply email
-     *                             address you own.
-     */
-    public function __construct($senderEmail) {
-
-        $this->senderEmail = $senderEmail;
-
-    }
-
-    /**
-     * Sends one or more iTip messages through email.
-     *
-     * @param string $originator Originator Email
-     * @param array $recipients Array of email addresses
-     * @param VObject\Component $vObject
-     * @param string $principal Principal Url of the originator
-     * @return void
-     */
-    public function sendMessage($originator, array $recipients, VObject\Component $vObject, $principal) {
-
-        foreach($recipients as $recipient) {
-
-            $to = $recipient;
-            $replyTo = $originator;
-            $subject = 'SabreDAV iTIP message';
-
-            switch(strtoupper($vObject->METHOD)) {
-                case 'REPLY' :
-                    $subject = 'Response for: ' . $vObject->VEVENT->SUMMARY;
-                    break;
-                case 'REQUEST' :
-                    $subject = 'Invitation for: ' .$vObject->VEVENT->SUMMARY;
-                    break;
-                case 'CANCEL' :
-                    $subject = 'Cancelled event: ' . $vObject->VEVENT->SUMMARY;
-                    break;
-            }
-
-            $headers = array();
-            $headers[] = 'Reply-To: ' . $replyTo;
-            $headers[] = 'From: ' . $this->senderEmail;
-            $headers[] = 'Content-Type: text/calendar; method=' . (string)$vObject->method . '; charset=utf-8';
-            if (DAV\Server::$exposeVersion) {
-                $headers[] = 'X-Sabre-Version: ' . DAV\Version::VERSION . '-' . DAV\Version::STABILITY;
-            }
-
-            $vcalBody = $vObject->serialize();
-
-            $this->mail($to, $subject, $vcalBody, $headers);
-
-        }
-
-    }
-
-    // @codeCoverageIgnoreStart
-    // This is deemed untestable in a reasonable manner
-
-    /**
-     * This function is reponsible for sending the actual email.
-     *
-     * @param string $to Recipient email address
-     * @param string $subject Subject of the email
-     * @param string $body iCalendar body
-     * @param array $headers List of headers
-     * @return void
-     */
-    protected function mail($to, $subject, $body, array $headers) {
-
-
-        mail($to, $subject, $body, implode("\r\n", $headers));
-
-    }
-
-    // @codeCoverageIgnoreEnd
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/SharingPlugin.php b/vendor/sabre/dav/lib/Sabre/CalDAV/SharingPlugin.php
deleted file mode 100644
index e869cb278..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/SharingPlugin.php
+++ /dev/null
@@ -1,526 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV;
-
-use Sabre\DAV;
-
-/**
- * This plugin implements support for caldav sharing.
- *
- * This spec is defined at:
- * http://svn.calendarserver.org/repository/calendarserver/CalendarServer/trunk/doc/Extensions/caldav-sharing.txt
- *
- * See:
- * Sabre\CalDAV\Backend\SharingSupport for all the documentation.
- *
- * Note: This feature is experimental, and may change in between different
- * SabreDAV versions.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class SharingPlugin extends DAV\ServerPlugin {
-
-    /**
-     * These are the various status constants used by sharing-messages.
-     */
-    const STATUS_ACCEPTED = 1;
-    const STATUS_DECLINED = 2;
-    const STATUS_DELETED = 3;
-    const STATUS_NORESPONSE = 4;
-    const STATUS_INVALID = 5;
-
-    /**
-     * Reference to SabreDAV server object.
-     *
-     * @var Sabre\DAV\Server
-     */
-    protected $server;
-
-    /**
-     * This method should return a list of server-features.
-     *
-     * This is for example 'versioning' and is added to the DAV: header
-     * in an OPTIONS response.
-     *
-     * @return array
-     */
-    public function getFeatures() {
-
-        return array('calendarserver-sharing');
-
-    }
-
-    /**
-     * Returns a plugin name.
-     *
-     * Using this name other plugins will be able to access other plugins
-     * using Sabre\DAV\Server::getPlugin
-     *
-     * @return string
-     */
-    public function getPluginName() {
-
-        return 'caldav-sharing';
-
-    }
-
-    /**
-     * This initializes the plugin.
-     *
-     * This function is called by Sabre\DAV\Server, after
-     * addPlugin is called.
-     *
-     * This method should set up the required event subscriptions.
-     *
-     * @param DAV\Server $server
-     * @return void
-     */
-    public function initialize(DAV\Server $server) {
-
-        $this->server = $server;
-        $server->resourceTypeMapping['Sabre\\CalDAV\\ISharedCalendar'] = '{' . Plugin::NS_CALENDARSERVER . '}shared';
-
-        array_push(
-            $this->server->protectedProperties,
-            '{' . Plugin::NS_CALENDARSERVER . '}invite',
-            '{' . Plugin::NS_CALENDARSERVER . '}allowed-sharing-modes',
-            '{' . Plugin::NS_CALENDARSERVER . '}shared-url'
-        );
-
-        $this->server->subscribeEvent('beforeGetProperties', array($this, 'beforeGetProperties'));
-        $this->server->subscribeEvent('afterGetProperties', array($this, 'afterGetProperties'));
-        $this->server->subscribeEvent('updateProperties', array($this, 'updateProperties'));
-        $this->server->subscribeEvent('unknownMethod', array($this,'unknownMethod'));
-
-    }
-
-    /**
-     * This event is triggered when properties are requested for a certain
-     * node.
-     *
-     * This allows us to inject any properties early.
-     *
-     * @param string $path
-     * @param DAV\INode $node
-     * @param array $requestedProperties
-     * @param array $returnedProperties
-     * @return void
-     */
-    public function beforeGetProperties($path, DAV\INode $node, &$requestedProperties, &$returnedProperties) {
-
-        if ($node instanceof IShareableCalendar) {
-            if (($index = array_search('{' . Plugin::NS_CALENDARSERVER . '}invite', $requestedProperties))!==false) {
-
-                unset($requestedProperties[$index]);
-                $returnedProperties[200]['{' . Plugin::NS_CALENDARSERVER . '}invite'] =
-                    new Property\Invite(
-                        $node->getShares()
-                    );
-
-            }
-
-        }
-
-        if ($node instanceof ISharedCalendar) {
-
-            if (($index = array_search('{' . Plugin::NS_CALENDARSERVER . '}shared-url', $requestedProperties))!==false) {
-
-                unset($requestedProperties[$index]);
-                $returnedProperties[200]['{' . Plugin::NS_CALENDARSERVER . '}shared-url'] =
-                    new DAV\Property\Href(
-                        $node->getSharedUrl()
-                    );
-
-            }
-            // The 'invite' property is slightly different for the 'shared'
-            // instance of the calendar, as it also contains the owner
-            // information.
-            if (($index = array_search('{' . Plugin::NS_CALENDARSERVER . '}invite', $requestedProperties))!==false) {
-
-                unset($requestedProperties[$index]);
-
-                // Fetching owner information
-                $props = $this->server->getPropertiesForPath($node->getOwner(), array(
-                    '{http://sabredav.org/ns}email-address',
-                    '{DAV:}displayname',
-                ), 1);
-
-                $ownerInfo = array(
-                    'href' => $node->getOwner(),
-                );
-
-                if (isset($props[0][200])) {
-
-                    // We're mapping the internal webdav properties to the
-                    // elements caldav-sharing expects.
-                    if (isset($props[0][200]['{http://sabredav.org/ns}email-address'])) {
-                        $ownerInfo['href'] = 'mailto:' . $props[0][200]['{http://sabredav.org/ns}email-address'];
-                    }
-                    if (isset($props[0][200]['{DAV:}displayname'])) {
-                        $ownerInfo['commonName'] = $props[0][200]['{DAV:}displayname'];
-                    }
-
-                }
-
-                $returnedProperties[200]['{' . Plugin::NS_CALENDARSERVER . '}invite'] =
-                    new Property\Invite(
-                        $node->getShares(),
-                        $ownerInfo
-                    );
-
-            }
-
-
-        }
-
-    }
-
-    /**
-     * This method is triggered *after* all properties have been retrieved.
-     * This allows us to inject the correct resourcetype for calendars that
-     * have been shared.
-     *
-     * @param string $path
-     * @param array $properties
-     * @param DAV\INode $node
-     * @return void
-     */
-    public function afterGetProperties($path, &$properties, DAV\INode $node) {
-
-        if ($node instanceof IShareableCalendar) {
-            if (isset($properties[200]['{DAV:}resourcetype'])) {
-                if (count($node->getShares())>0) {
-                    $properties[200]['{DAV:}resourcetype']->add(
-                        '{' . Plugin::NS_CALENDARSERVER . '}shared-owner'
-                    );
-                }
-            }
-            $propName = '{' . Plugin::NS_CALENDARSERVER . '}allowed-sharing-modes';
-            if (array_key_exists($propName, $properties[404])) {
-                unset($properties[404][$propName]);
-                $properties[200][$propName] = new Property\AllowedSharingModes(true,false);
-            }
-
-        }
-
-    }
-
-    /**
-     * This method is trigged when a user attempts to update a node's
-     * properties.
-     *
-     * A previous draft of the sharing spec stated that it was possible to use
-     * PROPPATCH to remove 'shared-owner' from the resourcetype, thus unsharing
-     * the calendar.
-     *
-     * Even though this is no longer in the current spec, we keep this around
-     * because OS X 10.7 may still make use of this feature.
-     *
-     * @param array $mutations
-     * @param array $result
-     * @param DAV\INode $node
-     * @return void
-     */
-    public function updateProperties(array &$mutations, array &$result, DAV\INode $node) {
-
-        if (!$node instanceof IShareableCalendar)
-            return;
-
-        if (!isset($mutations['{DAV:}resourcetype'])) {
-            return;
-        }
-
-        // Only doing something if shared-owner is indeed not in the list.
-        if($mutations['{DAV:}resourcetype']->is('{' . Plugin::NS_CALENDARSERVER . '}shared-owner')) return;
-
-        $shares = $node->getShares();
-        $remove = array();
-        foreach($shares as $share) {
-            $remove[] = $share['href'];
-        }
-        $node->updateShares(array(), $remove);
-
-        // We're marking this update as 200 OK
-        $result[200]['{DAV:}resourcetype'] = null;
-
-        // Removing it from the mutations list
-        unset($mutations['{DAV:}resourcetype']);
-
-    }
-
-    /**
-     * This event is triggered when the server didn't know how to handle a
-     * certain request.
-     *
-     * We intercept this to handle POST requests on calendars.
-     *
-     * @param string $method
-     * @param string $uri
-     * @return null|bool
-     */
-    public function unknownMethod($method, $uri) {
-
-        if ($method!=='POST') {
-            return;
-        }
-
-        // Only handling xml
-        $contentType = $this->server->httpRequest->getHeader('Content-Type');
-        if (strpos($contentType,'application/xml')===false && strpos($contentType,'text/xml')===false)
-            return;
-
-        // Making sure the node exists
-        try {
-            $node = $this->server->tree->getNodeForPath($uri);
-        } catch (DAV\Exception\NotFound $e) {
-            return;
-        }
-
-        $requestBody = $this->server->httpRequest->getBody(true);
-
-        // If this request handler could not deal with this POST request, it
-        // will return 'null' and other plugins get a chance to handle the
-        // request.
-        //
-        // However, we already requested the full body. This is a problem,
-        // because a body can only be read once. This is why we preemptively
-        // re-populated the request body with the existing data.
-        $this->server->httpRequest->setBody($requestBody);
-
-        $dom = DAV\XMLUtil::loadDOMDocument($requestBody);
-
-        $documentType = DAV\XMLUtil::toClarkNotation($dom->firstChild);
-
-        switch($documentType) {
-
-            // Dealing with the 'share' document, which modified invitees on a
-            // calendar.
-            case '{' . Plugin::NS_CALENDARSERVER . '}share' :
-
-                // We can only deal with IShareableCalendar objects
-                if (!$node instanceof IShareableCalendar) {
-                    return;
-                }
-
-                // Getting ACL info
-                $acl = $this->server->getPlugin('acl');
-
-                // If there's no ACL support, we allow everything
-                if ($acl) {
-                    $acl->checkPrivileges($uri, '{DAV:}write');
-                }
-
-                $mutations = $this->parseShareRequest($dom);
-
-                $node->updateShares($mutations[0], $mutations[1]);
-
-                $this->server->httpResponse->sendStatus(200);
-                // Adding this because sending a response body may cause issues,
-                // and I wanted some type of indicator the response was handled.
-                $this->server->httpResponse->setHeader('X-Sabre-Status', 'everything-went-well');
-
-                // Breaking the event chain
-                return false;
-
-            // The invite-reply document is sent when the user replies to an
-            // invitation of a calendar share.
-            case '{'. Plugin::NS_CALENDARSERVER.'}invite-reply' :
-
-                // This only works on the calendar-home-root node.
-                if (!$node instanceof UserCalendars) {
-                    return;
-                }
-
-                // Getting ACL info
-                $acl = $this->server->getPlugin('acl');
-
-                // If there's no ACL support, we allow everything
-                if ($acl) {
-                    $acl->checkPrivileges($uri, '{DAV:}write');
-                }
-
-                $message = $this->parseInviteReplyRequest($dom);
-
-                $url = $node->shareReply(
-                    $message['href'],
-                    $message['status'],
-                    $message['calendarUri'],
-                    $message['inReplyTo'],
-                    $message['summary']
-                );
-
-                $this->server->httpResponse->sendStatus(200);
-                // Adding this because sending a response body may cause issues,
-                // and I wanted some type of indicator the response was handled.
-                $this->server->httpResponse->setHeader('X-Sabre-Status', 'everything-went-well');
-
-                if ($url) {
-                    $dom = new \DOMDocument('1.0', 'UTF-8');
-                    $dom->formatOutput = true;
-
-                    $root = $dom->createElement('cs:shared-as');
-                    foreach($this->server->xmlNamespaces as $namespace => $prefix) {
-                        $root->setAttribute('xmlns:' . $prefix, $namespace);
-                    }
-
-                    $dom->appendChild($root);
-                    $href = new DAV\Property\Href($url);
-
-                    $href->serialize($this->server, $root);
-                    $this->server->httpResponse->setHeader('Content-Type','application/xml');
-                    $this->server->httpResponse->sendBody($dom->saveXML());
-
-                }
-
-                // Breaking the event chain
-                return false;
-
-            case '{' . Plugin::NS_CALENDARSERVER . '}publish-calendar' :
-
-                // We can only deal with IShareableCalendar objects
-                if (!$node instanceof IShareableCalendar) {
-                    return;
-                }
-
-                // Getting ACL info
-                $acl = $this->server->getPlugin('acl');
-
-                // If there's no ACL support, we allow everything
-                if ($acl) {
-                    $acl->checkPrivileges($uri, '{DAV:}write');
-                }
-
-                $node->setPublishStatus(true);
-
-                // iCloud sends back the 202, so we will too.
-                $this->server->httpResponse->sendStatus(202);
-
-                // Adding this because sending a response body may cause issues,
-                // and I wanted some type of indicator the response was handled.
-                $this->server->httpResponse->setHeader('X-Sabre-Status', 'everything-went-well');
-
-                // Breaking the event chain
-                return false;
-
-            case '{' . Plugin::NS_CALENDARSERVER . '}unpublish-calendar' :
-
-                // We can only deal with IShareableCalendar objects
-                if (!$node instanceof IShareableCalendar) {
-                    return;
-                }
-
-                // Getting ACL info
-                $acl = $this->server->getPlugin('acl');
-
-                // If there's no ACL support, we allow everything
-                if ($acl) {
-                    $acl->checkPrivileges($uri, '{DAV:}write');
-                }
-
-                $node->setPublishStatus(false);
-
-                $this->server->httpResponse->sendStatus(200);
-
-                // Adding this because sending a response body may cause issues,
-                // and I wanted some type of indicator the response was handled.
-                $this->server->httpResponse->setHeader('X-Sabre-Status', 'everything-went-well');
-
-                // Breaking the event chain
-                return false;
-
-        }
-
-
-
-    }
-
-    /**
-     * Parses the 'share' POST request.
-     *
-     * This method returns an array, containing two arrays.
-     * The first array is a list of new sharees. Every element is a struct
-     * containing a:
-     *   * href element. (usually a mailto: address)
-     *   * commonName element (often a first and lastname, but can also be
-     *     false)
-     *   * readOnly (true or false)
-     *   * summary (A description of the share, can also be false)
-     *
-     * The second array is a list of sharees that are to be removed. This is
-     * just a simple array with 'hrefs'.
-     *
-     * @param \DOMDocument $dom
-     * @return array
-     */
-    protected function parseShareRequest(\DOMDocument $dom) {
-
-        $xpath = new \DOMXPath($dom);
-        $xpath->registerNamespace('cs', Plugin::NS_CALENDARSERVER);
-        $xpath->registerNamespace('d', 'urn:DAV');
-
-        $set = array();
-        $elems = $xpath->query('cs:set');
-
-        for($i=0; $i < $elems->length; $i++) {
-
-            $xset = $elems->item($i);
-            $set[] = array(
-                'href' => $xpath->evaluate('string(d:href)', $xset),
-                'commonName' => $xpath->evaluate('string(cs:common-name)', $xset),
-                'summary' => $xpath->evaluate('string(cs:summary)', $xset),
-                'readOnly' => $xpath->evaluate('boolean(cs:read)', $xset)!==false
-            );
-
-        }
-
-        $remove = array();
-        $elems = $xpath->query('cs:remove');
-
-        for($i=0; $i < $elems->length; $i++) {
-
-            $xremove = $elems->item($i);
-            $remove[] = $xpath->evaluate('string(d:href)', $xremove);
-
-        }
-
-        return array($set, $remove);
-
-    }
-
-    /**
-     * Parses the 'invite-reply' POST request.
-     *
-     * This method returns an array, containing the following properties:
-     *   * href - The sharee who is replying
-     *   * status - One of the self::STATUS_* constants
-     *   * calendarUri - The url of the shared calendar
-     *   * inReplyTo - The unique id of the share invitation.
-     *   * summary - Optional description of the reply.
-     *
-     * @param \DOMDocument $dom
-     * @return array
-     */
-    protected function parseInviteReplyRequest(\DOMDocument $dom) {
-
-        $xpath = new \DOMXPath($dom);
-        $xpath->registerNamespace('cs', Plugin::NS_CALENDARSERVER);
-        $xpath->registerNamespace('d', 'urn:DAV');
-
-        $hostHref = $xpath->evaluate('string(cs:hosturl/d:href)');
-        if (!$hostHref) {
-            throw new DAV\Exception\BadRequest('The {' . Plugin::NS_CALENDARSERVER . '}hosturl/{DAV:}href element is required');
-        }
-
-        return array(
-            'href' => $xpath->evaluate('string(d:href)'),
-            'calendarUri' => $this->server->calculateUri($hostHref),
-            'inReplyTo' => $xpath->evaluate('string(cs:in-reply-to)'),
-            'summary' => $xpath->evaluate('string(cs:summary)'),
-            'status' => $xpath->evaluate('boolean(cs:invite-accepted)')?self::STATUS_ACCEPTED:self::STATUS_DECLINED
-        );
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CalDAV/Version.php b/vendor/sabre/dav/lib/Sabre/CalDAV/Version.php
deleted file mode 100644
index f30fc20ea..000000000
--- a/vendor/sabre/dav/lib/Sabre/CalDAV/Version.php
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-
-namespace Sabre\CalDAV;
-
-/**
- * This class contains the Sabre\CalDAV version constants.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Version {
-
-    /**
-     * Full version number
-     */
-    const VERSION = '1.8.7';
-
-    /**
-     * Stability : alpha, beta, stable
-     */
-    const STABILITY = 'stable';
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/AddressBook.php b/vendor/sabre/dav/lib/Sabre/CardDAV/AddressBook.php
deleted file mode 100644
index 399f38e8d..000000000
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/AddressBook.php
+++ /dev/null
@@ -1,315 +0,0 @@
-<?php
-
-namespace Sabre\CardDAV;
-
-use Sabre\DAV;
-use Sabre\DAVACL;
-
-/**
- * The AddressBook class represents a CardDAV addressbook, owned by a specific user
- *
- * The AddressBook can contain multiple vcards
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class AddressBook extends DAV\Collection implements IAddressBook, DAV\IProperties, DAVACL\IACL {
-
-    /**
-     * This is an array with addressbook information
-     *
-     * @var array
-     */
-    protected $addressBookInfo;
-
-    /**
-     * CardDAV backend
-     *
-     * @var Backend\BackendInterface
-     */
-    protected $carddavBackend;
-
-    /**
-     * Constructor
-     *
-     * @param Backend\BackendInterface $carddavBackend
-     * @param array $addressBookInfo
-     */
-    public function __construct(Backend\BackendInterface $carddavBackend, array $addressBookInfo) {
-
-        $this->carddavBackend = $carddavBackend;
-        $this->addressBookInfo = $addressBookInfo;
-
-    }
-
-    /**
-     * Returns the name of the addressbook
-     *
-     * @return string
-     */
-    public function getName() {
-
-        return $this->addressBookInfo['uri'];
-
-    }
-
-    /**
-     * Returns a card
-     *
-     * @param string $name
-     * @return \ICard
-     */
-    public function getChild($name) {
-
-        $obj = $this->carddavBackend->getCard($this->addressBookInfo['id'],$name);
-        if (!$obj) throw new DAV\Exception\NotFound('Card not found');
-        return new Card($this->carddavBackend,$this->addressBookInfo,$obj);
-
-    }
-
-    /**
-     * Returns the full list of cards
-     *
-     * @return array
-     */
-    public function getChildren() {
-
-        $objs = $this->carddavBackend->getCards($this->addressBookInfo['id']);
-        $children = array();
-        foreach($objs as $obj) {
-            $children[] = new Card($this->carddavBackend,$this->addressBookInfo,$obj);
-        }
-        return $children;
-
-    }
-
-    /**
-     * Creates a new directory
-     *
-     * We actually block this, as subdirectories are not allowed in addressbooks.
-     *
-     * @param string $name
-     * @return void
-     */
-    public function createDirectory($name) {
-
-        throw new DAV\Exception\MethodNotAllowed('Creating collections in addressbooks is not allowed');
-
-    }
-
-    /**
-     * Creates a new file
-     *
-     * The contents of the new file must be a valid VCARD.
-     *
-     * This method may return an ETag.
-     *
-     * @param string $name
-     * @param resource $vcardData
-     * @return string|null
-     */
-    public function createFile($name,$vcardData = null) {
-
-        if (is_resource($vcardData)) {
-            $vcardData = stream_get_contents($vcardData);
-        }
-        // Converting to UTF-8, if needed
-        $vcardData = DAV\StringUtil::ensureUTF8($vcardData);
-
-        return $this->carddavBackend->createCard($this->addressBookInfo['id'],$name,$vcardData);
-
-    }
-
-    /**
-     * Deletes the entire addressbook.
-     *
-     * @return void
-     */
-    public function delete() {
-
-        $this->carddavBackend->deleteAddressBook($this->addressBookInfo['id']);
-
-    }
-
-    /**
-     * Renames the addressbook
-     *
-     * @param string $newName
-     * @return void
-     */
-    public function setName($newName) {
-
-        throw new DAV\Exception\MethodNotAllowed('Renaming addressbooks is not yet supported');
-
-    }
-
-    /**
-     * Returns the last modification date as a unix timestamp.
-     *
-     * @return void
-     */
-    public function getLastModified() {
-
-        return null;
-
-    }
-
-    /**
-     * Updates properties on this node,
-     *
-     * The properties array uses the propertyName in clark-notation as key,
-     * and the array value for the property value. In the case a property
-     * should be deleted, the property value will be null.
-     *
-     * This method must be atomic. If one property cannot be changed, the
-     * entire operation must fail.
-     *
-     * If the operation was successful, true can be returned.
-     * If the operation failed, false can be returned.
-     *
-     * Deletion of a non-existent property is always successful.
-     *
-     * Lastly, it is optional to return detailed information about any
-     * failures. In this case an array should be returned with the following
-     * structure:
-     *
-     * array(
-     *   403 => array(
-     *      '{DAV:}displayname' => null,
-     *   ),
-     *   424 => array(
-     *      '{DAV:}owner' => null,
-     *   )
-     * )
-     *
-     * In this example it was forbidden to update {DAV:}displayname.
-     * (403 Forbidden), which in turn also caused {DAV:}owner to fail
-     * (424 Failed Dependency) because the request needs to be atomic.
-     *
-     * @param array $mutations
-     * @return bool|array
-     */
-    public function updateProperties($mutations) {
-
-        return $this->carddavBackend->updateAddressBook($this->addressBookInfo['id'], $mutations);
-
-    }
-
-    /**
-     * Returns a list of properties for this nodes.
-     *
-     * The properties list is a list of propertynames the client requested,
-     * encoded in clark-notation {xmlnamespace}tagname
-     *
-     * If the array is empty, it means 'all properties' were requested.
-     *
-     * @param array $properties
-     * @return array
-     */
-    public function getProperties($properties) {
-
-        $response = array();
-        foreach($properties as $propertyName) {
-
-            if (isset($this->addressBookInfo[$propertyName])) {
-
-                $response[$propertyName] = $this->addressBookInfo[$propertyName];
-
-            }
-
-        }
-
-        return $response;
-
-    }
-
-    /**
-     * Returns the owner principal
-     *
-     * This must be a url to a principal, or null if there's no owner
-     *
-     * @return string|null
-     */
-    public function getOwner() {
-
-        return $this->addressBookInfo['principaluri'];
-
-    }
-
-    /**
-     * Returns a group principal
-     *
-     * This must be a url to a principal, or null if there's no owner
-     *
-     * @return string|null
-     */
-    public function getGroup() {
-
-        return null;
-
-    }
-
-    /**
-     * Returns a list of ACE's for this node.
-     *
-     * Each ACE has the following properties:
-     *   * 'privilege', a string such as {DAV:}read or {DAV:}write. These are
-     *     currently the only supported privileges
-     *   * 'principal', a url to the principal who owns the node
-     *   * 'protected' (optional), indicating that this ACE is not allowed to
-     *      be updated.
-     *
-     * @return array
-     */
-    public function getACL() {
-
-        return array(
-            array(
-                'privilege' => '{DAV:}read',
-                'principal' => $this->addressBookInfo['principaluri'],
-                'protected' => true,
-            ),
-            array(
-                'privilege' => '{DAV:}write',
-                'principal' => $this->addressBookInfo['principaluri'],
-                'protected' => true,
-            ),
-
-        );
-
-    }
-
-    /**
-     * Updates the ACL
-     *
-     * This method will receive a list of new ACE's.
-     *
-     * @param array $acl
-     * @return void
-     */
-    public function setACL(array $acl) {
-
-        throw new DAV\Exception\MethodNotAllowed('Changing ACL is not yet supported');
-
-    }
-
-    /**
-     * Returns the list of supported privileges for this node.
-     *
-     * The returned data structure is a list of nested privileges.
-     * See Sabre\DAVACL\Plugin::getDefaultSupportedPrivilegeSet for a simple
-     * standard structure.
-     *
-     * If null is returned from this method, the default privilege set is used,
-     * which is fine for most common usecases.
-     *
-     * @return array|null
-     */
-    public function getSupportedPrivilegeSet() {
-
-        return null;
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/AddressBookQueryParser.php b/vendor/sabre/dav/lib/Sabre/CardDAV/AddressBookQueryParser.php
deleted file mode 100644
index 3277d98b0..000000000
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/AddressBookQueryParser.php
+++ /dev/null
@@ -1,221 +0,0 @@
-<?php
-
-namespace Sabre\CardDAV;
-
-use Sabre\DAV;
-
-/**
- * Parses the addressbook-query report request body.
- *
- * Whoever designed this format, and the CalDAV equivalent even more so,
- * has no feel for design.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class AddressBookQueryParser {
-
-    const TEST_ANYOF = 'anyof';
-    const TEST_ALLOF = 'allof';
-
-    /**
-     * List of requested properties the client wanted
-     *
-     * @var array
-     */
-    public $requestedProperties;
-
-    /**
-     * The number of results the client wants
-     *
-     * null means it wasn't specified, which in most cases means 'all results'.
-     *
-     * @var int|null
-     */
-    public $limit;
-
-    /**
-     * List of property filters.
-     *
-     * @var array
-     */
-    public $filters;
-
-    /**
-     * Either TEST_ANYOF or TEST_ALLOF
-     *
-     * @var string
-     */
-    public $test;
-
-    /**
-     * DOM Document
-     *
-     * @var DOMDocument
-     */
-    protected $dom;
-
-    /**
-     * DOM XPath object
-     *
-     * @var DOMXPath
-     */
-    protected $xpath;
-
-    /**
-     * Creates the parser
-     *
-     * @param \DOMDocument $dom
-     */
-    public function __construct(\DOMDocument $dom) {
-
-        $this->dom = $dom;
-
-        $this->xpath = new \DOMXPath($dom);
-        $this->xpath->registerNameSpace('card',Plugin::NS_CARDDAV);
-
-    }
-
-    /**
-     * Parses the request.
-     *
-     * @return void
-     */
-    public function parse() {
-
-        $filterNode = null;
-
-        $limit = $this->xpath->evaluate('number(/card:addressbook-query/card:limit/card:nresults)');
-        if (is_nan($limit)) $limit = null;
-
-        $filter = $this->xpath->query('/card:addressbook-query/card:filter');
-
-        // According to the CardDAV spec there needs to be exactly 1 filter
-        // element. However, KDE 4.8.2 contains a bug that will encode 0 filter
-        // elements, so this is a workaround for that.
-        //
-        // See: https://bugs.kde.org/show_bug.cgi?id=300047
-        if ($filter->length === 0) {
-            $test = null;
-            $filter = null;
-        } elseif ($filter->length === 1) {
-            $filter = $filter->item(0);
-            $test = $this->xpath->evaluate('string(@test)', $filter);
-        } else {
-            throw new DAV\Exception\BadRequest('Only one filter element is allowed');
-        }
-
-        if (!$test) $test = self::TEST_ANYOF;
-        if ($test !== self::TEST_ANYOF && $test !== self::TEST_ALLOF) {
-            throw new DAV\Exception\BadRequest('The test attribute must either hold "anyof" or "allof"');
-        }
-
-        $propFilters = array();
-
-        $propFilterNodes = $this->xpath->query('card:prop-filter', $filter);
-        for($ii=0; $ii < $propFilterNodes->length; $ii++) {
-
-            $propFilters[] = $this->parsePropFilterNode($propFilterNodes->item($ii));
-
-
-        }
-
-        $this->filters = $propFilters;
-        $this->limit = $limit;
-        $this->requestedProperties = array_keys(DAV\XMLUtil::parseProperties($this->dom->firstChild));
-        $this->test = $test;
-
-    }
-
-    /**
-     * Parses the prop-filter xml element
-     *
-     * @param \DOMElement $propFilterNode
-     * @return array
-     */
-    protected function parsePropFilterNode(\DOMElement $propFilterNode) {
-
-        $propFilter = array();
-        $propFilter['name'] = $propFilterNode->getAttribute('name');
-        $propFilter['test'] = $propFilterNode->getAttribute('test');
-        if (!$propFilter['test']) $propFilter['test'] = 'anyof';
-
-        $propFilter['is-not-defined'] = $this->xpath->query('card:is-not-defined', $propFilterNode)->length>0;
-
-        $paramFilterNodes = $this->xpath->query('card:param-filter', $propFilterNode);
-
-        $propFilter['param-filters'] = array();
-
-
-        for($ii=0;$ii<$paramFilterNodes->length;$ii++) {
-
-            $propFilter['param-filters'][] = $this->parseParamFilterNode($paramFilterNodes->item($ii));
-
-        }
-        $propFilter['text-matches'] = array();
-        $textMatchNodes = $this->xpath->query('card:text-match', $propFilterNode);
-
-        for($ii=0;$ii<$textMatchNodes->length;$ii++) {
-
-            $propFilter['text-matches'][] = $this->parseTextMatchNode($textMatchNodes->item($ii));
-
-        }
-
-        return $propFilter;
-
-    }
-
-    /**
-     * Parses the param-filter element
-     *
-     * @param \DOMElement $paramFilterNode
-     * @return array
-     */
-    public function parseParamFilterNode(\DOMElement $paramFilterNode) {
-
-        $paramFilter = array();
-        $paramFilter['name'] = $paramFilterNode->getAttribute('name');
-        $paramFilter['is-not-defined'] = $this->xpath->query('card:is-not-defined', $paramFilterNode)->length>0;
-        $paramFilter['text-match'] = null;
-
-        $textMatch = $this->xpath->query('card:text-match', $paramFilterNode);
-        if ($textMatch->length>0) {
-            $paramFilter['text-match'] = $this->parseTextMatchNode($textMatch->item(0));
-        }
-
-        return $paramFilter;
-
-    }
-
-    /**
-     * Text match
-     *
-     * @param \DOMElement $textMatchNode
-     * @return array
-     */
-    public function parseTextMatchNode(\DOMElement $textMatchNode) {
-
-        $matchType = $textMatchNode->getAttribute('match-type');
-        if (!$matchType) $matchType = 'contains';
-
-        if (!in_array($matchType, array('contains', 'equals', 'starts-with', 'ends-with'))) {
-            throw new DAV\Exception\BadRequest('Unknown match-type: ' . $matchType);
-        }
-
-        $negateCondition = $textMatchNode->getAttribute('negate-condition');
-        $negateCondition = $negateCondition==='yes';
-        $collation = $textMatchNode->getAttribute('collation');
-        if (!$collation) $collation = 'i;unicode-casemap';
-
-        return array(
-            'negate-condition' => $negateCondition,
-            'collation' => $collation,
-            'match-type' => $matchType,
-            'value' => $textMatchNode->nodeValue
-        );
-
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/Backend/AbstractBackend.php b/vendor/sabre/dav/lib/Sabre/CardDAV/Backend/AbstractBackend.php
deleted file mode 100644
index 46909efef..000000000
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/Backend/AbstractBackend.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?php
-
-namespace Sabre\CardDAV\Backend;
-
-/**
- * CardDAV abstract Backend
- *
- * This class serves as a base-class for addressbook backends
- *
- * This class doesn't do much, but it was added for consistency.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-abstract class AbstractBackend implements BackendInterface {
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/Backend/PDO.php b/vendor/sabre/dav/lib/Sabre/CardDAV/Backend/PDO.php
deleted file mode 100644
index 67e0ae3aa..000000000
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/Backend/PDO.php
+++ /dev/null
@@ -1,333 +0,0 @@
-<?php
-
-namespace Sabre\CardDAV\Backend;
-
-use Sabre\CardDAV;
-use Sabre\DAV;
-
-/**
- * PDO CardDAV backend
- *
- * This CardDAV backend uses PDO to store addressbooks
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class PDO extends AbstractBackend {
-
-    /**
-     * PDO connection
-     *
-     * @var PDO
-     */
-    protected $pdo;
-
-    /**
-     * The PDO table name used to store addressbooks
-     */
-    protected $addressBooksTableName;
-
-    /**
-     * The PDO table name used to store cards
-     */
-    protected $cardsTableName;
-
-    /**
-     * Sets up the object
-     *
-     * @param \PDO $pdo
-     * @param string $addressBooksTableName
-     * @param string $cardsTableName
-     */
-    public function __construct(\PDO $pdo, $addressBooksTableName = 'addressbooks', $cardsTableName = 'cards') {
-
-        $this->pdo = $pdo;
-        $this->addressBooksTableName = $addressBooksTableName;
-        $this->cardsTableName = $cardsTableName;
-
-    }
-
-    /**
-     * Returns the list of addressbooks for a specific user.
-     *
-     * @param string $principalUri
-     * @return array
-     */
-    public function getAddressBooksForUser($principalUri) {
-
-        $stmt = $this->pdo->prepare('SELECT id, uri, displayname, principaluri, description, ctag FROM '.$this->addressBooksTableName.' WHERE principaluri = ?');
-        $stmt->execute(array($principalUri));
-
-        $addressBooks = array();
-
-        foreach($stmt->fetchAll() as $row) {
-
-            $addressBooks[] = array(
-                'id'  => $row['id'],
-                'uri' => $row['uri'],
-                'principaluri' => $row['principaluri'],
-                '{DAV:}displayname' => $row['displayname'],
-                '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description' => $row['description'],
-                '{http://calendarserver.org/ns/}getctag' => $row['ctag'],
-                '{' . CardDAV\Plugin::NS_CARDDAV . '}supported-address-data' =>
-                    new CardDAV\Property\SupportedAddressData(),
-            );
-
-        }
-
-        return $addressBooks;
-
-    }
-
-
-    /**
-     * Updates an addressbook's properties
-     *
-     * See Sabre\DAV\IProperties for a description of the mutations array, as
-     * well as the return value.
-     *
-     * @param mixed $addressBookId
-     * @param array $mutations
-     * @see Sabre\DAV\IProperties::updateProperties
-     * @return bool|array
-     */
-    public function updateAddressBook($addressBookId, array $mutations) {
-
-        $updates = array();
-
-        foreach($mutations as $property=>$newValue) {
-
-            switch($property) {
-                case '{DAV:}displayname' :
-                    $updates['displayname'] = $newValue;
-                    break;
-                case '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description' :
-                    $updates['description'] = $newValue;
-                    break;
-                default :
-                    // If any unsupported values were being updated, we must
-                    // let the entire request fail.
-                    return false;
-            }
-
-        }
-
-        // No values are being updated?
-        if (!$updates) {
-            return false;
-        }
-
-        $query = 'UPDATE ' . $this->addressBooksTableName . ' SET ctag = ctag + 1 ';
-        foreach($updates as $key=>$value) {
-            $query.=', `' . $key . '` = :' . $key . ' ';
-        }
-        $query.=' WHERE id = :addressbookid';
-
-        $stmt = $this->pdo->prepare($query);
-        $updates['addressbookid'] = $addressBookId;
-
-        $stmt->execute($updates);
-
-        return true;
-
-    }
-
-    /**
-     * Creates a new address book
-     *
-     * @param string $principalUri
-     * @param string $url Just the 'basename' of the url.
-     * @param array $properties
-     * @return void
-     */
-    public function createAddressBook($principalUri, $url, array $properties) {
-
-        $values = array(
-            'displayname' => null,
-            'description' => null,
-            'principaluri' => $principalUri,
-            'uri' => $url,
-        );
-
-        foreach($properties as $property=>$newValue) {
-
-            switch($property) {
-                case '{DAV:}displayname' :
-                    $values['displayname'] = $newValue;
-                    break;
-                case '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description' :
-                    $values['description'] = $newValue;
-                    break;
-                default :
-                    throw new DAV\Exception\BadRequest('Unknown property: ' . $property);
-            }
-
-        }
-
-        $query = 'INSERT INTO ' . $this->addressBooksTableName . ' (uri, displayname, description, principaluri, ctag) VALUES (:uri, :displayname, :description, :principaluri, 1)';
-        $stmt = $this->pdo->prepare($query);
-        $stmt->execute($values);
-
-    }
-
-    /**
-     * Deletes an entire addressbook and all its contents
-     *
-     * @param int $addressBookId
-     * @return void
-     */
-    public function deleteAddressBook($addressBookId) {
-
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->cardsTableName . ' WHERE addressbookid = ?');
-        $stmt->execute(array($addressBookId));
-
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->addressBooksTableName . ' WHERE id = ?');
-        $stmt->execute(array($addressBookId));
-
-    }
-
-    /**
-     * Returns all cards for a specific addressbook id.
-     *
-     * This method should return the following properties for each card:
-     *   * carddata - raw vcard data
-     *   * uri - Some unique url
-     *   * lastmodified - A unix timestamp
-     *
-     * It's recommended to also return the following properties:
-     *   * etag - A unique etag. This must change every time the card changes.
-     *   * size - The size of the card in bytes.
-     *
-     * If these last two properties are provided, less time will be spent
-     * calculating them. If they are specified, you can also ommit carddata.
-     * This may speed up certain requests, especially with large cards.
-     *
-     * @param mixed $addressbookId
-     * @return array
-     */
-    public function getCards($addressbookId) {
-
-        $stmt = $this->pdo->prepare('SELECT id, carddata, uri, lastmodified FROM ' . $this->cardsTableName . ' WHERE addressbookid = ?');
-        $stmt->execute(array($addressbookId));
-
-        return $stmt->fetchAll(\PDO::FETCH_ASSOC);
-
-
-    }
-
-    /**
-     * Returns a specfic card.
-     *
-     * The same set of properties must be returned as with getCards. The only
-     * exception is that 'carddata' is absolutely required.
-     *
-     * @param mixed $addressBookId
-     * @param string $cardUri
-     * @return array
-     */
-    public function getCard($addressBookId, $cardUri) {
-
-        $stmt = $this->pdo->prepare('SELECT id, carddata, uri, lastmodified FROM ' . $this->cardsTableName . ' WHERE addressbookid = ? AND uri = ? LIMIT 1');
-        $stmt->execute(array($addressBookId, $cardUri));
-
-        $result = $stmt->fetchAll(\PDO::FETCH_ASSOC);
-
-        return (count($result)>0?$result[0]:false);
-
-    }
-
-    /**
-     * Creates a new card.
-     *
-     * The addressbook id will be passed as the first argument. This is the
-     * same id as it is returned from the getAddressbooksForUser method.
-     *
-     * The cardUri is a base uri, and doesn't include the full path. The
-     * cardData argument is the vcard body, and is passed as a string.
-     *
-     * It is possible to return an ETag from this method. This ETag is for the
-     * newly created resource, and must be enclosed with double quotes (that
-     * is, the string itself must contain the double quotes).
-     *
-     * You should only return the ETag if you store the carddata as-is. If a
-     * subsequent GET request on the same card does not have the same body,
-     * byte-by-byte and you did return an ETag here, clients tend to get
-     * confused.
-     *
-     * If you don't return an ETag, you can just return null.
-     *
-     * @param mixed $addressBookId
-     * @param string $cardUri
-     * @param string $cardData
-     * @return string|null
-     */
-    public function createCard($addressBookId, $cardUri, $cardData) {
-
-        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->cardsTableName . ' (carddata, uri, lastmodified, addressbookid) VALUES (?, ?, ?, ?)');
-
-        $result = $stmt->execute(array($cardData, $cardUri, time(), $addressBookId));
-
-        $stmt2 = $this->pdo->prepare('UPDATE ' . $this->addressBooksTableName . ' SET ctag = ctag + 1 WHERE id = ?');
-        $stmt2->execute(array($addressBookId));
-
-        return '"' . md5($cardData) . '"';
-
-    }
-
-    /**
-     * Updates a card.
-     *
-     * The addressbook id will be passed as the first argument. This is the
-     * same id as it is returned from the getAddressbooksForUser method.
-     *
-     * The cardUri is a base uri, and doesn't include the full path. The
-     * cardData argument is the vcard body, and is passed as a string.
-     *
-     * It is possible to return an ETag from this method. This ETag should
-     * match that of the updated resource, and must be enclosed with double
-     * quotes (that is: the string itself must contain the actual quotes).
-     *
-     * You should only return the ETag if you store the carddata as-is. If a
-     * subsequent GET request on the same card does not have the same body,
-     * byte-by-byte and you did return an ETag here, clients tend to get
-     * confused.
-     *
-     * If you don't return an ETag, you can just return null.
-     *
-     * @param mixed $addressBookId
-     * @param string $cardUri
-     * @param string $cardData
-     * @return string|null
-     */
-    public function updateCard($addressBookId, $cardUri, $cardData) {
-
-        $stmt = $this->pdo->prepare('UPDATE ' . $this->cardsTableName . ' SET carddata = ?, lastmodified = ? WHERE uri = ? AND addressbookid =?');
-        $stmt->execute(array($cardData, time(), $cardUri, $addressBookId));
-
-        $stmt2 = $this->pdo->prepare('UPDATE ' . $this->addressBooksTableName . ' SET ctag = ctag + 1 WHERE id = ?');
-        $stmt2->execute(array($addressBookId));
-
-        return '"' . md5($cardData) . '"';
-
-    }
-
-    /**
-     * Deletes a card
-     *
-     * @param mixed $addressBookId
-     * @param string $cardUri
-     * @return bool
-     */
-    public function deleteCard($addressBookId, $cardUri) {
-
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->cardsTableName . ' WHERE addressbookid = ? AND uri = ?');
-        $stmt->execute(array($addressBookId, $cardUri));
-
-        $stmt2 = $this->pdo->prepare('UPDATE ' . $this->addressBooksTableName . ' SET ctag = ctag + 1 WHERE id = ?');
-        $stmt2->execute(array($addressBookId));
-
-        return $stmt->rowCount()===1;
-
-    }
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/Plugin.php b/vendor/sabre/dav/lib/Sabre/CardDAV/Plugin.php
deleted file mode 100644
index 71a61fefc..000000000
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/Plugin.php
+++ /dev/null
@@ -1,706 +0,0 @@
-<?php
-
-namespace Sabre\CardDAV;
-
-use Sabre\DAV;
-use Sabre\DAVACL;
-use Sabre\VObject;
-
-/**
- * CardDAV plugin
- *
- * The CardDAV plugin adds CardDAV functionality to the WebDAV server
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Plugin extends DAV\ServerPlugin {
-
-    /**
-     * Url to the addressbooks
-     */
-    const ADDRESSBOOK_ROOT = 'addressbooks';
-
-    /**
-     * xml namespace for CardDAV elements
-     */
-    const NS_CARDDAV = 'urn:ietf:params:xml:ns:carddav';
-
-    /**
-     * Add urls to this property to have them automatically exposed as
-     * 'directories' to the user.
-     *
-     * @var array
-     */
-    public $directories = array();
-
-    /**
-     * Server class
-     *
-     * @var Sabre\DAV\Server
-     */
-    protected $server;
-
-    /**
-     * Initializes the plugin
-     *
-     * @param DAV\Server $server
-     * @return void
-     */
-    public function initialize(DAV\Server $server) {
-
-        /* Events */
-        $server->subscribeEvent('beforeGetProperties', array($this, 'beforeGetProperties'));
-        $server->subscribeEvent('afterGetProperties',  array($this, 'afterGetProperties'));
-        $server->subscribeEvent('updateProperties', array($this, 'updateProperties'));
-        $server->subscribeEvent('report', array($this,'report'));
-        $server->subscribeEvent('onHTMLActionsPanel', array($this,'htmlActionsPanel'));
-        $server->subscribeEvent('onBrowserPostAction', array($this,'browserPostAction'));
-        $server->subscribeEvent('beforeWriteContent', array($this, 'beforeWriteContent'));
-        $server->subscribeEvent('beforeCreateFile', array($this, 'beforeCreateFile'));
-
-        /* Namespaces */
-        $server->xmlNamespaces[self::NS_CARDDAV] = 'card';
-
-        /* Mapping Interfaces to {DAV:}resourcetype values */
-        $server->resourceTypeMapping['Sabre\\CardDAV\\IAddressBook'] = '{' . self::NS_CARDDAV . '}addressbook';
-        $server->resourceTypeMapping['Sabre\\CardDAV\\IDirectory'] = '{' . self::NS_CARDDAV . '}directory';
-
-        /* Adding properties that may never be changed */
-        $server->protectedProperties[] = '{' . self::NS_CARDDAV . '}supported-address-data';
-        $server->protectedProperties[] = '{' . self::NS_CARDDAV . '}max-resource-size';
-        $server->protectedProperties[] = '{' . self::NS_CARDDAV . '}addressbook-home-set';
-        $server->protectedProperties[] = '{' . self::NS_CARDDAV . '}supported-collation-set';
-
-        $server->propertyMap['{http://calendarserver.org/ns/}me-card'] = 'Sabre\\DAV\\Property\\Href';
-
-        $this->server = $server;
-
-    }
-
-    /**
-     * Returns a list of supported features.
-     *
-     * This is used in the DAV: header in the OPTIONS and PROPFIND requests.
-     *
-     * @return array
-     */
-    public function getFeatures() {
-
-        return array('addressbook');
-
-    }
-
-    /**
-     * Returns a list of reports this plugin supports.
-     *
-     * This will be used in the {DAV:}supported-report-set property.
-     * Note that you still need to subscribe to the 'report' event to actually
-     * implement them
-     *
-     * @param string $uri
-     * @return array
-     */
-    public function getSupportedReportSet($uri) {
-
-        $node = $this->server->tree->getNodeForPath($uri);
-        if ($node instanceof IAddressBook || $node instanceof ICard) {
-            return array(
-                 '{' . self::NS_CARDDAV . '}addressbook-multiget',
-                 '{' . self::NS_CARDDAV . '}addressbook-query',
-            );
-        }
-        return array();
-
-    }
-
-
-    /**
-     * Adds all CardDAV-specific properties
-     *
-     * @param string $path
-     * @param DAV\INode $node
-     * @param array $requestedProperties
-     * @param array $returnedProperties
-     * @return void
-     */
-    public function beforeGetProperties($path, DAV\INode $node, array &$requestedProperties, array &$returnedProperties) {
-
-        if ($node instanceof DAVACL\IPrincipal) {
-
-            // calendar-home-set property
-            $addHome = '{' . self::NS_CARDDAV . '}addressbook-home-set';
-            if (in_array($addHome,$requestedProperties)) {
-                $principalId = $node->getName();
-                $addressbookHomePath = self::ADDRESSBOOK_ROOT . '/' . $principalId . '/';
-                unset($requestedProperties[array_search($addHome, $requestedProperties)]);
-                $returnedProperties[200][$addHome] = new DAV\Property\Href($addressbookHomePath);
-            }
-
-            $directories = '{' . self::NS_CARDDAV . '}directory-gateway';
-            if ($this->directories && in_array($directories, $requestedProperties)) {
-                unset($requestedProperties[array_search($directories, $requestedProperties)]);
-                $returnedProperties[200][$directories] = new DAV\Property\HrefList($this->directories);
-            }
-
-        }
-
-        if ($node instanceof ICard) {
-
-            // The address-data property is not supposed to be a 'real'
-            // property, but in large chunks of the spec it does act as such.
-            // Therefore we simply expose it as a property.
-            $addressDataProp = '{' . self::NS_CARDDAV . '}address-data';
-            if (in_array($addressDataProp, $requestedProperties)) {
-                unset($requestedProperties[$addressDataProp]);
-                $val = $node->get();
-                if (is_resource($val))
-                    $val = stream_get_contents($val);
-
-                $returnedProperties[200][$addressDataProp] = $val;
-
-            }
-        }
-
-        if ($node instanceof UserAddressBooks) {
-
-            $meCardProp = '{http://calendarserver.org/ns/}me-card';
-            if (in_array($meCardProp, $requestedProperties)) {
-
-                $props = $this->server->getProperties($node->getOwner(), array('{http://sabredav.org/ns}vcard-url'));
-                if (isset($props['{http://sabredav.org/ns}vcard-url'])) {
-
-                    $returnedProperties[200][$meCardProp] = new DAV\Property\Href(
-                        $props['{http://sabredav.org/ns}vcard-url']
-                    );
-                    $pos = array_search($meCardProp, $requestedProperties);
-                    unset($requestedProperties[$pos]);
-
-                }
-
-            }
-
-        }
-
-    }
-
-    /**
-     * This event is triggered when a PROPPATCH method is executed
-     *
-     * @param array $mutations
-     * @param array $result
-     * @param DAV\INode $node
-     * @return bool
-     */
-    public function updateProperties(&$mutations, &$result, DAV\INode $node) {
-
-        if (!$node instanceof UserAddressBooks) {
-            return true;
-        }
-
-        $meCard = '{http://calendarserver.org/ns/}me-card';
-
-        // The only property we care about
-        if (!isset($mutations[$meCard]))
-            return true;
-
-        $value = $mutations[$meCard];
-        unset($mutations[$meCard]);
-
-        if ($value instanceof DAV\Property\IHref) {
-            $value = $value->getHref();
-            $value = $this->server->calculateUri($value);
-        } elseif (!is_null($value)) {
-            $result[400][$meCard] = null;
-            return false;
-        }
-
-        $innerResult = $this->server->updateProperties(
-            $node->getOwner(),
-            array(
-                '{http://sabredav.org/ns}vcard-url' => $value,
-            )
-        );
-
-        $closureResult = false;
-        foreach($innerResult as $status => $props) {
-            if (is_array($props) && array_key_exists('{http://sabredav.org/ns}vcard-url', $props)) {
-                $result[$status][$meCard] = null;
-                $closureResult = ($status>=200 && $status<300);
-            }
-
-        }
-
-        return $result;
-
-    }
-
-    /**
-     * This functions handles REPORT requests specific to CardDAV
-     *
-     * @param string $reportName
-     * @param \DOMNode $dom
-     * @return bool
-     */
-    public function report($reportName,$dom) {
-
-        switch($reportName) {
-            case '{'.self::NS_CARDDAV.'}addressbook-multiget' :
-                $this->addressbookMultiGetReport($dom);
-                return false;
-            case '{'.self::NS_CARDDAV.'}addressbook-query' :
-                $this->addressBookQueryReport($dom);
-                return false;
-            default :
-                return;
-
-        }
-
-
-    }
-
-    /**
-     * This function handles the addressbook-multiget REPORT.
-     *
-     * This report is used by the client to fetch the content of a series
-     * of urls. Effectively avoiding a lot of redundant requests.
-     *
-     * @param \DOMNode $dom
-     * @return void
-     */
-    public function addressbookMultiGetReport($dom) {
-
-        $properties = array_keys(DAV\XMLUtil::parseProperties($dom->firstChild));
-
-        $hrefElems = $dom->getElementsByTagNameNS('urn:DAV','href');
-        $propertyList = array();
-
-        foreach($hrefElems as $elem) {
-
-            $uri = $this->server->calculateUri($elem->nodeValue);
-            list($propertyList[]) = $this->server->getPropertiesForPath($uri,$properties);
-
-        }
-
-        $prefer = $this->server->getHTTPPRefer();
-
-        $this->server->httpResponse->sendStatus(207);
-        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
-        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($propertyList, $prefer['return-minimal']));
-
-    }
-
-    /**
-     * This method is triggered before a file gets updated with new content.
-     *
-     * This plugin uses this method to ensure that Card nodes receive valid
-     * vcard data.
-     *
-     * @param string $path
-     * @param DAV\IFile $node
-     * @param resource $data
-     * @return void
-     */
-    public function beforeWriteContent($path, DAV\IFile $node, &$data) {
-
-        if (!$node instanceof ICard)
-            return;
-
-        $this->validateVCard($data);
-
-    }
-
-    /**
-     * This method is triggered before a new file is created.
-     *
-     * This plugin uses this method to ensure that Card nodes receive valid
-     * vcard data.
-     *
-     * @param string $path
-     * @param resource $data
-     * @param DAV\ICollection $parentNode
-     * @return void
-     */
-    public function beforeCreateFile($path, &$data, DAV\ICollection $parentNode) {
-
-        if (!$parentNode instanceof IAddressBook)
-            return;
-
-        $this->validateVCard($data);
-
-    }
-
-    /**
-     * Checks if the submitted iCalendar data is in fact, valid.
-     *
-     * An exception is thrown if it's not.
-     *
-     * @param resource|string $data
-     * @return void
-     */
-    protected function validateVCard(&$data) {
-
-        // If it's a stream, we convert it to a string first.
-        if (is_resource($data)) {
-            $data = stream_get_contents($data);
-        }
-
-        // Converting the data to unicode, if needed.
-        $data = DAV\StringUtil::ensureUTF8($data);
-
-        try {
-
-            $vobj = VObject\Reader::read($data);
-
-        } catch (VObject\ParseException $e) {
-
-            throw new DAV\Exception\UnsupportedMediaType('This resource only supports valid vcard data. Parse error: ' . $e->getMessage());
-
-        }
-
-        if ($vobj->name !== 'VCARD') {
-            throw new DAV\Exception\UnsupportedMediaType('This collection can only support vcard objects.');
-        }
-
-        if (!isset($vobj->UID)) {
-            // No UID in vcards is invalid, but we'll just add it in anyway.
-            $vobj->add('UID', DAV\UUIDUtil::getUUID());
-            $data = $vobj->serialize();
-        }
-
-    }
-
-
-    /**
-     * This function handles the addressbook-query REPORT
-     *
-     * This report is used by the client to filter an addressbook based on a
-     * complex query.
-     *
-     * @param \DOMNode $dom
-     * @return void
-     */
-    protected function addressbookQueryReport($dom) {
-
-        $query = new AddressBookQueryParser($dom);
-        $query->parse();
-
-        $depth = $this->server->getHTTPDepth(0);
-
-        if ($depth==0) {
-            $candidateNodes = array(
-                $this->server->tree->getNodeForPath($this->server->getRequestUri())
-            );
-        } else {
-            $candidateNodes = $this->server->tree->getChildren($this->server->getRequestUri());
-        }
-
-        $validNodes = array();
-        foreach($candidateNodes as $node) {
-
-            if (!$node instanceof ICard)
-                continue;
-
-            $blob = $node->get();
-            if (is_resource($blob)) {
-                $blob = stream_get_contents($blob);
-            }
-
-            if (!$this->validateFilters($blob, $query->filters, $query->test)) {
-                continue;
-            }
-
-            $validNodes[] = $node;
-
-            if ($query->limit && $query->limit <= count($validNodes)) {
-                // We hit the maximum number of items, we can stop now.
-                break;
-            }
-
-        }
-
-        $result = array();
-        foreach($validNodes as $validNode) {
-
-            if ($depth==0) {
-                $href = $this->server->getRequestUri();
-            } else {
-                $href = $this->server->getRequestUri() . '/' . $validNode->getName();
-            }
-
-            list($result[]) = $this->server->getPropertiesForPath($href, $query->requestedProperties, 0);
-
-        }
-
-        $prefer = $this->server->getHTTPPRefer();
-
-        $this->server->httpResponse->sendStatus(207);
-        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->setHeader('Vary','Brief,Prefer');
-        $this->server->httpResponse->sendBody($this->server->generateMultiStatus($result, $prefer['return-minimal']));
-
-    }
-
-    /**
-     * Validates if a vcard makes it throught a list of filters.
-     *
-     * @param string $vcardData
-     * @param array $filters
-     * @param string $test anyof or allof (which means OR or AND)
-     * @return bool
-     */
-    public function validateFilters($vcardData, array $filters, $test) {
-
-        $vcard = VObject\Reader::read($vcardData);
-
-        if (!$filters) return true;
-
-        foreach($filters as $filter) {
-
-            $isDefined = isset($vcard->{$filter['name']});
-            if ($filter['is-not-defined']) {
-                if ($isDefined) {
-                    $success = false;
-                } else {
-                    $success = true;
-                }
-            } elseif ((!$filter['param-filters'] && !$filter['text-matches']) || !$isDefined) {
-
-                // We only need to check for existence
-                $success = $isDefined;
-
-            } else {
-
-                $vProperties = $vcard->select($filter['name']);
-
-                $results = array();
-                if ($filter['param-filters']) {
-                    $results[] = $this->validateParamFilters($vProperties, $filter['param-filters'], $filter['test']);
-                }
-                if ($filter['text-matches']) {
-                    $texts = array();
-                    foreach($vProperties as $vProperty)
-                        $texts[] = $vProperty->getValue();
-
-                    $results[] = $this->validateTextMatches($texts, $filter['text-matches'], $filter['test']);
-                }
-
-                if (count($results)===1) {
-                    $success = $results[0];
-                } else {
-                    if ($filter['test'] === 'anyof') {
-                        $success = $results[0] || $results[1];
-                    } else {
-                        $success = $results[0] && $results[1];
-                    }
-                }
-
-            } // else
-
-            // There are two conditions where we can already determine whether
-            // or not this filter succeeds.
-            if ($test==='anyof' && $success) {
-                return true;
-            }
-            if ($test==='allof' && !$success) {
-                return false;
-            }
-
-        } // foreach
-
-        // If we got all the way here, it means we haven't been able to
-        // determine early if the test failed or not.
-        //
-        // This implies for 'anyof' that the test failed, and for 'allof' that
-        // we succeeded. Sounds weird, but makes sense.
-        return $test==='allof';
-
-    }
-
-    /**
-     * Validates if a param-filter can be applied to a specific property.
-     *
-     * @todo currently we're only validating the first parameter of the passed
-     *       property. Any subsequence parameters with the same name are
-     *       ignored.
-     * @param array $vProperties
-     * @param array $filters
-     * @param string $test
-     * @return bool
-     */
-    protected function validateParamFilters(array $vProperties, array $filters, $test) {
-
-        foreach($filters as $filter) {
-
-            $isDefined = false;
-            foreach($vProperties as $vProperty) {
-                $isDefined = isset($vProperty[$filter['name']]);
-                if ($isDefined) break;
-            }
-
-            if ($filter['is-not-defined']) {
-                if ($isDefined) {
-                    $success = false;
-                } else {
-                    $success = true;
-                }
-
-            // If there's no text-match, we can just check for existence
-            } elseif (!$filter['text-match'] || !$isDefined) {
-
-                $success = $isDefined;
-
-            } else {
-
-                $success = false;
-                foreach($vProperties as $vProperty) {
-                    // If we got all the way here, we'll need to validate the
-                    // text-match filter.
-                    $success = DAV\StringUtil::textMatch($vProperty[$filter['name']]->getValue(), $filter['text-match']['value'], $filter['text-match']['collation'], $filter['text-match']['match-type']);
-                    if ($success) break;
-                }
-                if ($filter['text-match']['negate-condition']) {
-                    $success = !$success;
-                }
-
-            } // else
-
-            // There are two conditions where we can already determine whether
-            // or not this filter succeeds.
-            if ($test==='anyof' && $success) {
-                return true;
-            }
-            if ($test==='allof' && !$success) {
-                return false;
-            }
-
-        }
-
-        // If we got all the way here, it means we haven't been able to
-        // determine early if the test failed or not.
-        //
-        // This implies for 'anyof' that the test failed, and for 'allof' that
-        // we succeeded. Sounds weird, but makes sense.
-        return $test==='allof';
-
-    }
-
-    /**
-     * Validates if a text-filter can be applied to a specific property.
-     *
-     * @param array $texts
-     * @param array $filters
-     * @param string $test
-     * @return bool
-     */
-    protected function validateTextMatches(array $texts, array $filters, $test) {
-
-        foreach($filters as $filter) {
-
-            $success = false;
-            foreach($texts as $haystack) {
-                $success = DAV\StringUtil::textMatch($haystack, $filter['value'], $filter['collation'], $filter['match-type']);
-
-                // Breaking on the first match
-                if ($success) break;
-            }
-            if ($filter['negate-condition']) {
-                $success = !$success;
-            }
-
-            if ($success && $test==='anyof')
-                return true;
-
-            if (!$success && $test=='allof')
-                return false;
-
-
-        }
-
-        // If we got all the way here, it means we haven't been able to
-        // determine early if the test failed or not.
-        //
-        // This implies for 'anyof' that the test failed, and for 'allof' that
-        // we succeeded. Sounds weird, but makes sense.
-        return $test==='allof';
-
-    }
-
-    /**
-     * This event is triggered after webdav-properties have been retrieved.
-     *
-     * @return bool
-     */
-    public function afterGetProperties($uri, &$properties) {
-
-        // If the request was made using the SOGO connector, we must rewrite
-        // the content-type property. By default SabreDAV will send back
-        // text/x-vcard; charset=utf-8, but for SOGO we must strip that last
-        // part.
-        if (!isset($properties[200]['{DAV:}getcontenttype']))
-            return;
-
-        if (strpos($this->server->httpRequest->getHeader('User-Agent'),'Thunderbird')===false) {
-            return;
-        }
-
-        if (strpos($properties[200]['{DAV:}getcontenttype'],'text/x-vcard')===0) {
-            $properties[200]['{DAV:}getcontenttype'] = 'text/x-vcard';
-        }
-
-    }
-
-    /**
-     * This method is used to generate HTML output for the
-     * Sabre\DAV\Browser\Plugin. This allows us to generate an interface users
-     * can use to create new calendars.
-     *
-     * @param DAV\INode $node
-     * @param string $output
-     * @return bool
-     */
-    public function htmlActionsPanel(DAV\INode $node, &$output) {
-
-        if (!$node instanceof UserAddressBooks)
-            return;
-
-        $output.= '<tr><td colspan="2"><form method="post" action="">
-            <h3>Create new address book</h3>
-            <input type="hidden" name="sabreAction" value="mkaddressbook" />
-            <label>Name (uri):</label> <input type="text" name="name" /><br />
-            <label>Display name:</label> <input type="text" name="{DAV:}displayname" /><br />
-            <input type="submit" value="create" />
-            </form>
-            </td></tr>';
-
-        return false;
-
-    }
-
-    /**
-     * This method allows us to intercept the 'mkcalendar' sabreAction. This
-     * action enables the user to create new calendars from the browser plugin.
-     *
-     * @param string $uri
-     * @param string $action
-     * @param array $postVars
-     * @return bool
-     */
-    public function browserPostAction($uri, $action, array $postVars) {
-
-        if ($action!=='mkaddressbook')
-            return;
-
-        $resourceType = array('{DAV:}collection','{urn:ietf:params:xml:ns:carddav}addressbook');
-        $properties = array();
-        if (isset($postVars['{DAV:}displayname'])) {
-            $properties['{DAV:}displayname'] = $postVars['{DAV:}displayname'];
-        }
-        $this->server->createCollection($uri . '/' . $postVars['name'],$resourceType,$properties);
-        return false;
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/Property/SupportedAddressData.php b/vendor/sabre/dav/lib/Sabre/CardDAV/Property/SupportedAddressData.php
deleted file mode 100644
index 9d8dd2e6d..000000000
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/Property/SupportedAddressData.php
+++ /dev/null
@@ -1,72 +0,0 @@
-<?php
-
-namespace Sabre\CardDAV\Property;
-
-use Sabre\DAV;
-use Sabre\CardDAV;
-
-/**
- * Supported-address-data property
- *
- * This property is a representation of the supported-address-data property
- * in the CardDAV namespace.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class SupportedAddressData extends DAV\Property {
-
-    /**
-     * supported versions
-     *
-     * @var array
-     */
-    protected $supportedData = array();
-
-    /**
-     * Creates the property
-     *
-     * @param array|null $supportedData
-     */
-    public function __construct(array $supportedData = null) {
-
-        if (is_null($supportedData)) {
-            $supportedData = array(
-                array('contentType' => 'text/vcard', 'version' => '3.0'),
-                // array('contentType' => 'text/vcard', 'version' => '4.0'),
-            );
-        }
-
-       $this->supportedData = $supportedData;
-
-    }
-
-    /**
-     * Serializes the property in a DOMDocument
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $node) {
-
-        $doc = $node->ownerDocument;
-
-        $prefix =
-            isset($server->xmlNamespaces[CardDAV\Plugin::NS_CARDDAV]) ?
-            $server->xmlNamespaces[CardDAV\Plugin::NS_CARDDAV] :
-            'card';
-
-        foreach($this->supportedData as $supported) {
-
-            $caldata = $doc->createElementNS(CardDAV\Plugin::NS_CARDDAV, $prefix . ':address-data-type');
-            $caldata->setAttribute('content-type',$supported['contentType']);
-            $caldata->setAttribute('version',$supported['version']);
-            $node->appendChild($caldata);
-
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/VCFExportPlugin.php b/vendor/sabre/dav/lib/Sabre/CardDAV/VCFExportPlugin.php
deleted file mode 100644
index 3f91a3012..000000000
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/VCFExportPlugin.php
+++ /dev/null
@@ -1,108 +0,0 @@
-<?php
-
-namespace Sabre\CardDAV;
-
-use Sabre\DAV;
-use Sabre\VObject;
-
-/**
- * VCF Exporter
- *
- * This plugin adds the ability to export entire address books as .vcf files.
- * This is useful for clients that don't support CardDAV yet. They often do
- * support vcf files.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @author Thomas Tanghus (http://tanghus.net/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class VCFExportPlugin extends DAV\ServerPlugin {
-
-    /**
-     * Reference to Server class
-     *
-     * @var Sabre\DAV\Server
-     */
-    protected $server;
-
-    /**
-     * Initializes the plugin and registers event handlers
-     *
-     * @param DAV\Server $server
-     * @return void
-     */
-    public function initialize(DAV\Server $server) {
-
-        $this->server = $server;
-        $this->server->subscribeEvent('beforeMethod',array($this,'beforeMethod'), 90);
-
-    }
-
-    /**
-     * 'beforeMethod' event handles. This event handles intercepts GET requests ending
-     * with ?export
-     *
-     * @param string $method
-     * @param string $uri
-     * @return bool
-     */
-    public function beforeMethod($method, $uri) {
-
-        if ($method!='GET') return;
-        if ($this->server->httpRequest->getQueryString()!='export') return;
-
-        // splitting uri
-        list($uri) = explode('?',$uri,2);
-
-        $node = $this->server->tree->getNodeForPath($uri);
-
-        if (!($node instanceof IAddressBook)) return;
-
-        // Checking ACL, if available.
-        if ($aclPlugin = $this->server->getPlugin('acl')) {
-            $aclPlugin->checkPrivileges($uri, '{DAV:}read');
-        }
-
-        $this->server->httpResponse->setHeader('Content-Type','text/directory');
-        $this->server->httpResponse->sendStatus(200);
-
-        $nodes = $this->server->getPropertiesForPath($uri, array(
-            '{' . Plugin::NS_CARDDAV . '}address-data',
-        ),1);
-
-        $this->server->httpResponse->sendBody($this->generateVCF($nodes));
-
-        // Returning false to break the event chain
-        return false;
-
-    }
-
-    /**
-     * Merges all vcard objects, and builds one big vcf export
-     *
-     * @param array $nodes
-     * @return string
-     */
-    public function generateVCF(array $nodes) {
-
-        $output = "";
-
-        foreach($nodes as $node) {
-
-            if (!isset($node[200]['{' . Plugin::NS_CARDDAV . '}address-data'])) {
-                continue;
-            }
-            $nodeData = $node[200]['{' . Plugin::NS_CARDDAV . '}address-data'];
-
-            // Parsing this node so VObject can clean up the output.
-            $output .=
-               VObject\Reader::read($nodeData)->serialize();
-
-        }
-
-        return $output;
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/CardDAV/Version.php b/vendor/sabre/dav/lib/Sabre/CardDAV/Version.php
deleted file mode 100644
index 00221941b..000000000
--- a/vendor/sabre/dav/lib/Sabre/CardDAV/Version.php
+++ /dev/null
@@ -1,26 +0,0 @@
-<?php
-
-namespace Sabre\CardDAV;
-
-/**
- * Version Class
- *
- * This class contains the Sabre\CardDAV version information
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Version {
-
-    /**
-     * Full version number
-     */
-    const VERSION = '1.8.7';
-
-    /**
-     * Stability : alpha, beta, stable
-     */
-    const STABILITY = 'stable';
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/AbstractBasic.php b/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/AbstractBasic.php
deleted file mode 100644
index 599f932d4..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/AbstractBasic.php
+++ /dev/null
@@ -1,87 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Auth\Backend;
-
-use Sabre\DAV;
-use Sabre\HTTP;
-
-/**
- * HTTP Basic authentication backend class
- *
- * This class can be used by authentication objects wishing to use HTTP Basic
- * Most of the digest logic is handled, implementors just need to worry about
- * the validateUserPass method.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author James David Low (http://jameslow.com/)
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-abstract class AbstractBasic implements BackendInterface {
-
-    /**
-     * This variable holds the currently logged in username.
-     *
-     * @var string|null
-     */
-    protected $currentUser;
-
-    /**
-     * Validates a username and password
-     *
-     * This method should return true or false depending on if login
-     * succeeded.
-     *
-     * @param string $username
-     * @param string $password
-     * @return bool
-     */
-    abstract protected function validateUserPass($username, $password);
-
-    /**
-     * Returns information about the currently logged in username.
-     *
-     * If nobody is currently logged in, this method should return null.
-     *
-     * @return string|null
-     */
-    public function getCurrentUser() {
-        return $this->currentUser;
-    }
-
-
-    /**
-     * Authenticates the user based on the current request.
-     *
-     * If authentication is successful, true must be returned.
-     * If authentication fails, an exception must be thrown.
-     *
-     * @param DAV\Server $server
-     * @param string $realm
-     * @throws DAV\Exception\NotAuthenticated
-     * @return bool
-     */
-    public function authenticate(DAV\Server $server, $realm) {
-
-        $auth = new HTTP\BasicAuth();
-        $auth->setHTTPRequest($server->httpRequest);
-        $auth->setHTTPResponse($server->httpResponse);
-        $auth->setRealm($realm);
-        $userpass = $auth->getUserPass();
-        if (!$userpass) {
-            $auth->requireLogin();
-            throw new DAV\Exception\NotAuthenticated('No basic authentication headers were found');
-        }
-
-        // Authenticates the user
-        if (!$this->validateUserPass($userpass[0],$userpass[1])) {
-            $auth->requireLogin();
-            throw new DAV\Exception\NotAuthenticated('Username or password does not match');
-        }
-        $this->currentUser = $userpass[0];
-        return true;
-    }
-
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/AbstractDigest.php b/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/AbstractDigest.php
deleted file mode 100644
index dc00438c9..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/AbstractDigest.php
+++ /dev/null
@@ -1,101 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Auth\Backend;
-
-use Sabre\HTTP;
-use Sabre\DAV;
-
-/**
- * HTTP Digest authentication backend class
- *
- * This class can be used by authentication objects wishing to use HTTP Digest
- * Most of the digest logic is handled, implementors just need to worry about
- * the getDigestHash method
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-abstract class AbstractDigest implements BackendInterface {
-
-    /**
-     * This variable holds the currently logged in username.
-     *
-     * @var array|null
-     */
-    protected $currentUser;
-
-    /**
-     * Returns a users digest hash based on the username and realm.
-     *
-     * If the user was not known, null must be returned.
-     *
-     * @param string $realm
-     * @param string $username
-     * @return string|null
-     */
-    abstract public function getDigestHash($realm, $username);
-
-    /**
-     * Authenticates the user based on the current request.
-     *
-     * If authentication is successful, true must be returned.
-     * If authentication fails, an exception must be thrown.
-     *
-     * @param DAV\Server $server
-     * @param string $realm
-     * @throws DAV\Exception\NotAuthenticated
-     * @return bool
-     */
-    public function authenticate(DAV\Server $server, $realm) {
-
-        $digest = new HTTP\DigestAuth();
-
-        // Hooking up request and response objects
-        $digest->setHTTPRequest($server->httpRequest);
-        $digest->setHTTPResponse($server->httpResponse);
-
-        $digest->setRealm($realm);
-        $digest->init();
-
-        $username = $digest->getUsername();
-
-        // No username was given
-        if (!$username) {
-            $digest->requireLogin();
-            throw new DAV\Exception\NotAuthenticated('No digest authentication headers were found');
-        }
-
-        $hash = $this->getDigestHash($realm, $username);
-        // If this was false, the user account didn't exist
-        if ($hash===false || is_null($hash)) {
-            $digest->requireLogin();
-            throw new DAV\Exception\NotAuthenticated('The supplied username was not on file');
-        }
-        if (!is_string($hash)) {
-            throw new DAV\Exception('The returned value from getDigestHash must be a string or null');
-        }
-
-        // If this was false, the password or part of the hash was incorrect.
-        if (!$digest->validateA1($hash)) {
-            $digest->requireLogin();
-            throw new DAV\Exception\NotAuthenticated('Incorrect username');
-        }
-
-        $this->currentUser = $username;
-        return true;
-
-    }
-
-    /**
-     * Returns the currently logged in username.
-     *
-     * @return string|null
-     */
-    public function getCurrentUser() {
-
-        return $this->currentUser;
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/Apache.php b/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/Apache.php
deleted file mode 100644
index 66fdd91e1..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/Apache.php
+++ /dev/null
@@ -1,63 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Auth\Backend;
-use Sabre\DAV;
-
-/**
- * Apache authenticator
- *
- * This authentication backend assumes that authentication has been
- * configured in apache, rather than within SabreDAV.
- *
- * Make sure apache is properly configured for this to work.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Apache implements BackendInterface {
-
-    /**
-     * Current apache user
-     *
-     * @var string
-     */
-    protected $remoteUser;
-
-    /**
-     * Authenticates the user based on the current request.
-     *
-     * If authentication is successful, true must be returned.
-     * If authentication fails, an exception must be thrown.
-     *
-     * @param DAV\Server $server
-     * @param string $realm
-     * @return bool
-     */
-    public function authenticate(DAV\Server $server, $realm) {
-
-        $remoteUser = $server->httpRequest->getRawServerValue('REMOTE_USER');
-        if (is_null($remoteUser)) {
-            throw new DAV\Exception('We did not receive the $_SERVER[REMOTE_USER] property. This means that apache might have been misconfigured');
-        }
-
-        $this->remoteUser = $remoteUser;
-        return true;
-
-    }
-
-    /**
-     * Returns information about the currently logged in user.
-     *
-     * If nobody is currently logged in, this method should return null.
-     *
-     * @return array|null
-     */
-    public function getCurrentUser() {
-
-        return $this->remoteUser;
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/BackendInterface.php b/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/BackendInterface.php
deleted file mode 100644
index b8d04e2e1..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Backend/BackendInterface.php
+++ /dev/null
@@ -1,36 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Auth\Backend;
-
-/**
- * This is the base class for any authentication object.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-interface BackendInterface {
-
-    /**
-     * Authenticates the user based on the current request.
-     *
-     * If authentication is successful, true must be returned.
-     * If authentication fails, an exception must be thrown.
-     *
-     * @param \Sabre\DAV\Server $server
-     * @param string $realm
-     * @return bool
-     */
-    function authenticate(\Sabre\DAV\Server $server,$realm);
-
-    /**
-     * Returns information about the currently logged in username.
-     *
-     * If nobody is currently logged in, this method should return null.
-     *
-     * @return string|null
-     */
-    function getCurrentUser();
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Plugin.php b/vendor/sabre/dav/lib/Sabre/DAV/Auth/Plugin.php
deleted file mode 100644
index dbebc20f0..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Auth/Plugin.php
+++ /dev/null
@@ -1,112 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Auth;
-use Sabre\DAV;
-
-/**
- * This plugin provides Authentication for a WebDAV server.
- *
- * It relies on a Backend object, which provides user information.
- *
- * Additionally, it provides support for:
- *  * {DAV:}current-user-principal property from RFC5397
- *  * {DAV:}principal-collection-set property from RFC3744
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Plugin extends DAV\ServerPlugin {
-
-    /**
-     * Reference to main server object
-     *
-     * @var Sabre\DAV\Server
-     */
-    protected $server;
-
-    /**
-     * Authentication backend
-     *
-     * @var Backend\BackendInterface
-     */
-    protected $authBackend;
-
-    /**
-     * The authentication realm.
-     *
-     * @var string
-     */
-    private $realm;
-
-    /**
-     * __construct
-     *
-     * @param Backend\BackendInterface $authBackend
-     * @param string $realm
-     */
-    public function __construct(Backend\BackendInterface $authBackend, $realm) {
-
-        $this->authBackend = $authBackend;
-        $this->realm = $realm;
-
-    }
-
-    /**
-     * Initializes the plugin. This function is automatically called by the server
-     *
-     * @param DAV\Server $server
-     * @return void
-     */
-    public function initialize(DAV\Server $server) {
-
-        $this->server = $server;
-        $this->server->subscribeEvent('beforeMethod',array($this,'beforeMethod'),10);
-
-    }
-
-    /**
-     * Returns a plugin name.
-     *
-     * Using this name other plugins will be able to access other plugins
-     * using DAV\Server::getPlugin
-     *
-     * @return string
-     */
-    public function getPluginName() {
-
-        return 'auth';
-
-    }
-
-    /**
-     * Returns the current users' principal uri.
-     *
-     * If nobody is logged in, this will return null.
-     *
-     * @return string|null
-     */
-    public function getCurrentUser() {
-
-        $userInfo = $this->authBackend->getCurrentUser();
-        if (!$userInfo) return null;
-
-        return $userInfo;
-
-    }
-
-    /**
-     * This method is called before any HTTP method and forces users to be authenticated
-     *
-     * @param string $method
-     * @param string $uri
-     * @throws Sabre\DAV\Exception\NotAuthenticated
-     * @return bool
-     */
-    public function beforeMethod($method, $uri) {
-
-        $this->authBackend->authenticate($this->server,$this->realm);
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/Plugin.php b/vendor/sabre/dav/lib/Sabre/DAV/Browser/Plugin.php
deleted file mode 100644
index 751c22965..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/Plugin.php
+++ /dev/null
@@ -1,491 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Browser;
-
-use Sabre\DAV;
-
-/**
- * Browser Plugin
- *
- * This plugin provides a html representation, so that a WebDAV server may be accessed
- * using a browser.
- *
- * The class intercepts GET requests to collection resources and generates a simple
- * html index.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Plugin extends DAV\ServerPlugin {
-
-    /**
-     * List of default icons for nodes.
-     *
-     * This is an array with class / interface names as keys, and asset names
-     * as values.
-     *
-     * The evaluation order is reversed. The last item in the list gets
-     * precendence.
-     *
-     * @var array
-     */
-    public $iconMap = array(
-        'Sabre\\DAV\\IFile' => 'icons/file',
-        'Sabre\\DAV\\ICollection' => 'icons/collection',
-        'Sabre\\DAVACL\\IPrincipal' => 'icons/principal',
-        'Sabre\\CalDAV\\ICalendar' => 'icons/calendar',
-        'Sabre\\CardDAV\\IAddressBook' => 'icons/addressbook',
-        'Sabre\\CardDAV\\ICard' => 'icons/card',
-    );
-
-    /**
-     * The file extension used for all icons
-     *
-     * @var string
-     */
-    public $iconExtension = '.png';
-
-    /**
-     * reference to server class
-     *
-     * @var Sabre\DAV\Server
-     */
-    protected $server;
-
-    /**
-     * enablePost turns on the 'actions' panel, which allows people to create
-     * folders and upload files straight from a browser.
-     *
-     * @var bool
-     */
-    protected $enablePost = true;
-
-    /**
-     * By default the browser plugin will generate a favicon and other images.
-     * To turn this off, set this property to false.
-     *
-     * @var bool
-     */
-    protected $enableAssets = true;
-
-    /**
-     * Creates the object.
-     *
-     * By default it will allow file creation and uploads.
-     * Specify the first argument as false to disable this
-     *
-     * @param bool $enablePost
-     * @param bool $enableAssets
-     */
-    public function __construct($enablePost=true, $enableAssets = true) {
-
-        $this->enablePost = $enablePost;
-        $this->enableAssets = $enableAssets;
-
-    }
-
-    /**
-     * Initializes the plugin and subscribes to events
-     *
-     * @param DAV\Server $server
-     * @return void
-     */
-    public function initialize(DAV\Server $server) {
-
-        $this->server = $server;
-        $this->server->subscribeEvent('beforeMethod',array($this,'httpGetInterceptor'));
-        $this->server->subscribeEvent('onHTMLActionsPanel', array($this, 'htmlActionsPanel'),200);
-        if ($this->enablePost) $this->server->subscribeEvent('unknownMethod',array($this,'httpPOSTHandler'));
-    }
-
-    /**
-     * This method intercepts GET requests to collections and returns the html
-     *
-     * @param string $method
-     * @param string $uri
-     * @return bool
-     */
-    public function httpGetInterceptor($method, $uri) {
-
-        if ($method !== 'GET') return true;
-
-        // We're not using straight-up $_GET, because we want everything to be
-        // unit testable.
-        $getVars = array();
-        parse_str($this->server->httpRequest->getQueryString(), $getVars);
-
-        if (isset($getVars['sabreAction']) && $getVars['sabreAction'] === 'asset' && isset($getVars['assetName'])) {
-            $this->serveAsset($getVars['assetName']);
-            return false;
-        }
-
-        try {
-            $node = $this->server->tree->getNodeForPath($uri);
-        } catch (DAV\Exception\NotFound $e) {
-            // We're simply stopping when the file isn't found to not interfere
-            // with other plugins.
-            return;
-        }
-        if ($node instanceof DAV\IFile)
-            return;
-
-        $this->server->httpResponse->sendStatus(200);
-        $this->server->httpResponse->setHeader('Content-Type','text/html; charset=utf-8');
-
-        $this->server->httpResponse->sendBody(
-            $this->generateDirectoryIndex($uri)
-        );
-
-        return false;
-
-    }
-
-    /**
-     * Handles POST requests for tree operations.
-     *
-     * @param string $method
-     * @param string $uri
-     * @return bool
-     */
-    public function httpPOSTHandler($method, $uri) {
-
-        if ($method!='POST') return;
-        $contentType = $this->server->httpRequest->getHeader('Content-Type');
-        list($contentType) = explode(';', $contentType);
-        if ($contentType !== 'application/x-www-form-urlencoded' &&
-            $contentType !== 'multipart/form-data') {
-                return;
-        }
-        $postVars = $this->server->httpRequest->getPostVars();
-
-        if (!isset($postVars['sabreAction']))
-            return;
-
-        if ($this->server->broadcastEvent('onBrowserPostAction', array($uri, $postVars['sabreAction'], $postVars))) {
-
-            switch($postVars['sabreAction']) {
-
-                case 'mkcol' :
-                    if (isset($postVars['name']) && trim($postVars['name'])) {
-                        // Using basename() because we won't allow slashes
-                        list(, $folderName) = DAV\URLUtil::splitPath(trim($postVars['name']));
-                        $this->server->createDirectory($uri . '/' . $folderName);
-                    }
-                    break;
-                case 'put' :
-                    if ($_FILES) $file = current($_FILES);
-                    else break;
-
-                    list(, $newName) = DAV\URLUtil::splitPath(trim($file['name']));
-                    if (isset($postVars['name']) && trim($postVars['name']))
-                        $newName = trim($postVars['name']);
-
-                    // Making sure we only have a 'basename' component
-                    list(, $newName) = DAV\URLUtil::splitPath($newName);
-
-                    if (is_uploaded_file($file['tmp_name'])) {
-                        $this->server->createFile($uri . '/' . $newName, fopen($file['tmp_name'],'r'));
-                    }
-                    break;
-
-            }
-
-        }
-        $this->server->httpResponse->setHeader('Location',$this->server->httpRequest->getUri());
-        $this->server->httpResponse->sendStatus(302);
-        return false;
-
-    }
-
-    /**
-     * Escapes a string for html.
-     *
-     * @param string $value
-     * @return string
-     */
-    public function escapeHTML($value) {
-
-        return htmlspecialchars($value,ENT_QUOTES,'UTF-8');
-
-    }
-
-    /**
-     * Generates the html directory index for a given url
-     *
-     * @param string $path
-     * @return string
-     */
-    public function generateDirectoryIndex($path) {
-
-        $version = '';
-        if (DAV\Server::$exposeVersion) {
-            $version = DAV\Version::VERSION ."-". DAV\Version::STABILITY;
-        }
-
-        $html = "<html>
-<head>
-  <title>Index for " . $this->escapeHTML($path) . "/ - SabreDAV " . $version . "</title>
-  <style type=\"text/css\">
-  body { Font-family: arial}
-  h1 { font-size: 150% }
-  </style>
-        ";
-
-        if ($this->enableAssets) {
-            $html.='<link rel="shortcut icon" href="'.$this->getAssetUrl('favicon.ico').'" type="image/vnd.microsoft.icon" />';
-        }
-
-        $html .= "</head>
-<body>
-  <h1>Index for " . $this->escapeHTML($path) . "/</h1>
-  <table>
-    <tr><th width=\"24\"></th><th>Name</th><th>Type</th><th>Size</th><th>Last modified</th></tr>
-    <tr><td colspan=\"5\"><hr /></td></tr>";
-
-        $files = $this->server->getPropertiesForPath($path,array(
-            '{DAV:}displayname',
-            '{DAV:}resourcetype',
-            '{DAV:}getcontenttype',
-            '{DAV:}getcontentlength',
-            '{DAV:}getlastmodified',
-        ),1);
-
-        $parent = $this->server->tree->getNodeForPath($path);
-
-
-        if ($path) {
-
-            list($parentUri) = DAV\URLUtil::splitPath($path);
-            $fullPath = DAV\URLUtil::encodePath($this->server->getBaseUri() . $parentUri);
-
-            $icon = $this->enableAssets?'<a href="' . $fullPath . '"><img src="' . $this->getAssetUrl('icons/parent' . $this->iconExtension) . '" width="24" alt="Parent" /></a>':'';
-            $html.= "<tr>
-    <td>$icon</td>
-    <td><a href=\"{$fullPath}\">..</a></td>
-    <td>[parent]</td>
-    <td></td>
-    <td></td>
-    </tr>";
-
-        }
-
-        foreach($files as $file) {
-
-            // This is the current directory, we can skip it
-            if (rtrim($file['href'],'/')==$path) continue;
-
-            list(, $name) = DAV\URLUtil::splitPath($file['href']);
-
-            $type = null;
-
-
-            if (isset($file[200]['{DAV:}resourcetype'])) {
-                $type = $file[200]['{DAV:}resourcetype']->getValue();
-
-                // resourcetype can have multiple values
-                if (!is_array($type)) $type = array($type);
-
-                foreach($type as $k=>$v) {
-
-                    // Some name mapping is preferred
-                    switch($v) {
-                        case '{DAV:}collection' :
-                            $type[$k] = 'Collection';
-                            break;
-                        case '{DAV:}principal' :
-                            $type[$k] = 'Principal';
-                            break;
-                        case '{urn:ietf:params:xml:ns:carddav}addressbook' :
-                            $type[$k] = 'Addressbook';
-                            break;
-                        case '{urn:ietf:params:xml:ns:caldav}calendar' :
-                            $type[$k] = 'Calendar';
-                            break;
-                        case '{urn:ietf:params:xml:ns:caldav}schedule-inbox' :
-                            $type[$k] = 'Schedule Inbox';
-                            break;
-                        case '{urn:ietf:params:xml:ns:caldav}schedule-outbox' :
-                            $type[$k] = 'Schedule Outbox';
-                            break;
-                        case '{http://calendarserver.org/ns/}calendar-proxy-read' :
-                            $type[$k] = 'Proxy-Read';
-                            break;
-                        case '{http://calendarserver.org/ns/}calendar-proxy-write' :
-                            $type[$k] = 'Proxy-Write';
-                            break;
-                    }
-
-                }
-                $type = implode(', ', $type);
-            }
-
-            // If no resourcetype was found, we attempt to use
-            // the contenttype property
-            if (!$type && isset($file[200]['{DAV:}getcontenttype'])) {
-                $type = $file[200]['{DAV:}getcontenttype'];
-            }
-            if (!$type) $type = 'Unknown';
-
-            $size = isset($file[200]['{DAV:}getcontentlength'])?(int)$file[200]['{DAV:}getcontentlength']:'';
-            $lastmodified = isset($file[200]['{DAV:}getlastmodified'])?$file[200]['{DAV:}getlastmodified']->getTime()->format(\DateTime::ATOM):'';
-
-            $fullPath = DAV\URLUtil::encodePath('/' . trim($this->server->getBaseUri() . ($path?$path . '/':'') . $name,'/'));
-
-            $displayName = isset($file[200]['{DAV:}displayname'])?$file[200]['{DAV:}displayname']:$name;
-
-            $displayName = $this->escapeHTML($displayName);
-            $type = $this->escapeHTML($type);
-
-            $icon = '';
-
-            if ($this->enableAssets) {
-                $node = $this->server->tree->getNodeForPath(($path?$path.'/':'') . $name);
-                foreach(array_reverse($this->iconMap) as $class=>$iconName) {
-
-                    if ($node instanceof $class) {
-                        $icon = '<a href="' . $fullPath . '"><img src="' . $this->getAssetUrl($iconName . $this->iconExtension) . '" alt="" width="24" /></a>';
-                        break;
-                    }
-
-
-                }
-
-            }
-
-            $html.= "<tr>
-    <td>$icon</td>
-    <td><a href=\"{$fullPath}\">{$displayName}</a></td>
-    <td>{$type}</td>
-    <td>{$size}</td>
-    <td>{$lastmodified}</td>
-    </tr>";
-
-        }
-
-        $html.= "<tr><td colspan=\"5\"><hr /></td></tr>";
-
-        $output = '';
-
-        if ($this->enablePost) {
-            $this->server->broadcastEvent('onHTMLActionsPanel',array($parent, &$output));
-        }
-
-        $html.=$output;
-
-        $html.= "</table>
-        <address>Generated by SabreDAV " . $version . " (c)2007-2014 <a href=\"http://sabre.io/\">http://sabre.io/</a></address>
-        </body>
-        </html>";
-
-        return $html;
-
-    }
-
-    /**
-     * This method is used to generate the 'actions panel' output for
-     * collections.
-     *
-     * This specifically generates the interfaces for creating new files, and
-     * creating new directories.
-     *
-     * @param DAV\INode $node
-     * @param mixed $output
-     * @return void
-     */
-    public function htmlActionsPanel(DAV\INode $node, &$output) {
-
-        if (!$node instanceof DAV\ICollection)
-            return;
-
-        // We also know fairly certain that if an object is a non-extended
-        // SimpleCollection, we won't need to show the panel either.
-        if (get_class($node)==='Sabre\\DAV\\SimpleCollection')
-            return;
-
-        $output.= '<tr><td colspan="2"><form method="post" action="">
-            <h3>Create new folder</h3>
-            <input type="hidden" name="sabreAction" value="mkcol" />
-            Name: <input type="text" name="name" /><br />
-            <input type="submit" value="create" />
-            </form>
-            <form method="post" action="" enctype="multipart/form-data">
-            <h3>Upload file</h3>
-            <input type="hidden" name="sabreAction" value="put" />
-            Name (optional): <input type="text" name="name" /><br />
-            File: <input type="file" name="file" /><br />
-            <input type="submit" value="upload" />
-            </form>
-            </td></tr>';
-
-    }
-
-    /**
-     * This method takes a path/name of an asset and turns it into url
-     * suiteable for http access.
-     *
-     * @param string $assetName
-     * @return string
-     */
-    protected function getAssetUrl($assetName) {
-
-        return $this->server->getBaseUri() . '?sabreAction=asset&assetName=' . urlencode($assetName);
-
-    }
-
-    /**
-     * This method returns a local pathname to an asset.
-     *
-     * @param string $assetName
-     * @return string
-     */
-    protected function getLocalAssetPath($assetName) {
-
-        $assetDir = __DIR__ . '/assets/';
-        $path = $assetDir . $assetName;
-
-        // Making sure people aren't trying to escape from the base path.
-        if (strpos(realpath($path), realpath($assetDir)) === 0) {
-            return $path;
-        }
-        throw new DAV\Exception\Forbidden('Path does not exist, or escaping from the base path was detected');
-    }
-
-    /**
-     * This method reads an asset from disk and generates a full http response.
-     *
-     * @param string $assetName
-     * @return void
-     */
-    protected function serveAsset($assetName) {
-
-        $assetPath = $this->getLocalAssetPath($assetName);
-        if (!file_exists($assetPath)) {
-            throw new DAV\Exception\NotFound('Could not find an asset with this name');
-        }
-        // Rudimentary mime type detection
-        switch(strtolower(substr($assetPath,strpos($assetPath,'.')+1))) {
-
-        case 'ico' :
-            $mime = 'image/vnd.microsoft.icon';
-            break;
-
-        case 'png' :
-            $mime = 'image/png';
-            break;
-
-        default:
-            $mime = 'application/octet-stream';
-            break;
-
-        }
-
-        $this->server->httpResponse->setHeader('Content-Type', $mime);
-        $this->server->httpResponse->setHeader('Content-Length', filesize($assetPath));
-        $this->server->httpResponse->setHeader('Cache-Control', 'public, max-age=1209600');
-        $this->server->httpResponse->sendStatus(200);
-        $this->server->httpResponse->sendBody(fopen($assetPath,'r'));
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/addressbook.png b/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/addressbook.png
deleted file mode 100644
index c9acc8417..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/addressbook.png
+++ /dev/null
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/calendar.png b/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/calendar.png
deleted file mode 100644
index 3ecd6a800..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/calendar.png
+++ /dev/null
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/card.png b/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/card.png
deleted file mode 100644
index 2ce954866..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/card.png
+++ /dev/null
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/collection.png b/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/collection.png
deleted file mode 100644
index 156fa64fd..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/collection.png
+++ /dev/null
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/file.png b/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/file.png
deleted file mode 100644
index 3b98551ce..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/file.png
+++ /dev/null
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/parent.png b/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/parent.png
deleted file mode 100644
index 156fa64fd..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/parent.png
+++ /dev/null
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/principal.png b/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/principal.png
deleted file mode 100644
index f8988f828..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Browser/assets/icons/principal.png
+++ /dev/null
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Client.php b/vendor/sabre/dav/lib/Sabre/DAV/Client.php
deleted file mode 100644
index 705b32195..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Client.php
+++ /dev/null
@@ -1,575 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-
-/**
- * SabreDAV DAV client
- *
- * This client wraps around Curl to provide a convenient API to a WebDAV
- * server.
- *
- * NOTE: This class is experimental, it's api will likely change in the future.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Client {
-
-    /**
-     * The propertyMap is a key-value array.
-     *
-     * If you use the propertyMap, any {DAV:}multistatus responses with the
-     * proeprties listed in this array, will automatically be mapped to a
-     * respective class.
-     *
-     * The {DAV:}resourcetype property is automatically added. This maps to
-     * Sabre\DAV\Property\ResourceType
-     *
-     * @var array
-     */
-    public $propertyMap = array();
-
-    protected $baseUri;
-    protected $userName;
-    protected $password;
-    protected $proxy;
-    protected $trustedCertificates;
-
-    /**
-     * Basic authentication
-     */
-    const AUTH_BASIC = 1;
-
-    /**
-     * Digest authentication
-     */
-    const AUTH_DIGEST = 2;
-
-    /**
-     * The authentication type we're using.
-     *
-     * This is a bitmask of AUTH_BASIC and AUTH_DIGEST.
-     *
-     * If DIGEST is used, the client makes 1 extra request per request, to get
-     * the authentication tokens.
-     *
-     * @var int
-     */
-    protected $authType;
-
-    /**
-     * Indicates if SSL verification is enabled or not.
-     *
-     * @var boolean
-     */
-    protected $verifyPeer;
-
-    /**
-     * Constructor
-     *
-     * Settings are provided through the 'settings' argument. The following
-     * settings are supported:
-     *
-     *   * baseUri
-     *   * userName (optional)
-     *   * password (optional)
-     *   * proxy (optional)
-     *
-     * @param array $settings
-     */
-    public function __construct(array $settings) {
-
-        if (!isset($settings['baseUri'])) {
-            throw new \InvalidArgumentException('A baseUri must be provided');
-        }
-
-        $validSettings = array(
-            'baseUri',
-            'userName',
-            'password',
-            'proxy',
-        );
-
-        foreach($validSettings as $validSetting) {
-            if (isset($settings[$validSetting])) {
-                $this->$validSetting = $settings[$validSetting];
-            }
-        }
-
-        if (isset($settings['authType'])) {
-            $this->authType = $settings['authType'];
-        } else {
-            $this->authType = self::AUTH_BASIC | self::AUTH_DIGEST;
-        }
-
-        $this->propertyMap['{DAV:}resourcetype'] = 'Sabre\\DAV\\Property\\ResourceType';
-
-    }
-
-    /**
-     * Add trusted root certificates to the webdav client.
-     *
-     * The parameter certificates should be a absolute path to a file
-     * which contains all trusted certificates
-     *
-     * @param string $certificates
-     */
-    public function addTrustedCertificates($certificates) {
-        $this->trustedCertificates = $certificates;
-    }
-
-    /**
-     * Enables/disables SSL peer verification
-     *
-     * @param boolean $value
-     */
-    public function setVerifyPeer($value) {
-        $this->verifyPeer = $value;
-    }
-
-    /**
-     * Does a PROPFIND request
-     *
-     * The list of requested properties must be specified as an array, in clark
-     * notation.
-     *
-     * The returned array will contain a list of filenames as keys, and
-     * properties as values.
-     *
-     * The properties array will contain the list of properties. Only properties
-     * that are actually returned from the server (without error) will be
-     * returned, anything else is discarded.
-     *
-     * Depth should be either 0 or 1. A depth of 1 will cause a request to be
-     * made to the server to also return all child resources.
-     *
-     * @param string $url
-     * @param array $properties
-     * @param int $depth
-     * @return array
-     */
-    public function propFind($url, array $properties, $depth = 0) {
-
-        $body = '<?xml version="1.0"?>' . "\n";
-        $body.= '<d:propfind xmlns:d="DAV:">' . "\n";
-        $body.= '  <d:prop>' . "\n";
-
-        foreach($properties as $property) {
-
-            list(
-                $namespace,
-                $elementName
-            ) = XMLUtil::parseClarkNotation($property);
-
-            if ($namespace === 'DAV:') {
-                $body.='    <d:' . $elementName . ' />' . "\n";
-            } else {
-                $body.="    <x:" . $elementName . " xmlns:x=\"" . $namespace . "\"/>\n";
-            }
-
-        }
-
-        $body.= '  </d:prop>' . "\n";
-        $body.= '</d:propfind>';
-
-        $response = $this->request('PROPFIND', $url, $body, array(
-            'Depth' => $depth,
-            'Content-Type' => 'application/xml'
-        ));
-
-        $result = $this->parseMultiStatus($response['body']);
-
-        // If depth was 0, we only return the top item
-        if ($depth===0) {
-            reset($result);
-            $result = current($result);
-            return isset($result[200])?$result[200]:array();
-        }
-
-        $newResult = array();
-        foreach($result as $href => $statusList) {
-
-            $newResult[$href] = isset($statusList[200])?$statusList[200]:array();
-
-        }
-
-        return $newResult;
-
-    }
-
-    /**
-     * Updates a list of properties on the server
-     *
-     * The list of properties must have clark-notation properties for the keys,
-     * and the actual (string) value for the value. If the value is null, an
-     * attempt is made to delete the property.
-     *
-     * @todo Must be building the request using the DOM, and does not yet
-     *       support complex properties.
-     * @param string $url
-     * @param array $properties
-     * @return void
-     */
-    public function propPatch($url, array $properties) {
-
-        $body = '<?xml version="1.0"?>' . "\n";
-        $body.= '<d:propertyupdate xmlns:d="DAV:">' . "\n";
-
-        foreach($properties as $propName => $propValue) {
-
-            list(
-                $namespace,
-                $elementName
-            ) = XMLUtil::parseClarkNotation($propName);
-
-            if ($propValue === null) {
-
-                $body.="<d:remove><d:prop>\n";
-
-                if ($namespace === 'DAV:') {
-                    $body.='    <d:' . $elementName . ' />' . "\n";
-                } else {
-                    $body.="    <x:" . $elementName . " xmlns:x=\"" . $namespace . "\"/>\n";
-                }
-
-                $body.="</d:prop></d:remove>\n";
-
-            } else {
-
-                $body.="<d:set><d:prop>\n";
-                if ($namespace === 'DAV:') {
-                    $body.='    <d:' . $elementName . '>';
-                } else {
-                    $body.="    <x:" . $elementName . " xmlns:x=\"" . $namespace . "\">";
-                }
-                // Shitty.. i know
-                $body.=htmlspecialchars($propValue, ENT_NOQUOTES, 'UTF-8');
-                if ($namespace === 'DAV:') {
-                    $body.='</d:' . $elementName . '>' . "\n";
-                } else {
-                    $body.="</x:" . $elementName . ">\n";
-                }
-                $body.="</d:prop></d:set>\n";
-
-            }
-
-        }
-
-        $body.= '</d:propertyupdate>';
-
-        $this->request('PROPPATCH', $url, $body, array(
-            'Content-Type' => 'application/xml'
-        ));
-
-    }
-
-    /**
-     * Performs an HTTP options request
-     *
-     * This method returns all the features from the 'DAV:' header as an array.
-     * If there was no DAV header, or no contents this method will return an
-     * empty array.
-     *
-     * @return array
-     */
-    public function options() {
-
-        $result = $this->request('OPTIONS');
-        if (!isset($result['headers']['dav'])) {
-            return array();
-        }
-
-        $features = explode(',', $result['headers']['dav']);
-        foreach($features as &$v) {
-            $v = trim($v);
-        }
-        return $features;
-
-    }
-
-    /**
-     * Performs an actual HTTP request, and returns the result.
-     *
-     * If the specified url is relative, it will be expanded based on the base
-     * url.
-     *
-     * The returned array contains 3 keys:
-     *   * body - the response body
-     *   * httpCode - a HTTP code (200, 404, etc)
-     *   * headers - a list of response http headers. The header names have
-     *     been lowercased.
-     *
-     * @param string $method
-     * @param string $url
-     * @param string $body
-     * @param array $headers
-     * @return array
-     */
-    public function request($method, $url = '', $body = null, $headers = array()) {
-
-        $url = $this->getAbsoluteUrl($url);
-
-        $curlSettings = array(
-            CURLOPT_RETURNTRANSFER => true,
-            // Return headers as part of the response
-            CURLOPT_HEADER => true,
-
-            // For security we cast this to a string. If somehow an array could
-            // be passed here, it would be possible for an attacker to use @ to
-            // post local files.
-            CURLOPT_POSTFIELDS => (string)$body,
-            // Automatically follow redirects
-            CURLOPT_FOLLOWLOCATION => true,
-            CURLOPT_MAXREDIRS => 5,
-        );
-
-        if($this->verifyPeer !== null) {
-            $curlSettings[CURLOPT_SSL_VERIFYPEER] = $this->verifyPeer;
-        }
-
-        if($this->trustedCertificates) {
-            $curlSettings[CURLOPT_CAINFO] = $this->trustedCertificates;
-        }
-
-        switch ($method) {
-            case 'HEAD' :
-
-                // do not read body with HEAD requests (this is necessary because cURL does not ignore the body with HEAD
-                // requests when the Content-Length header is given - which in turn is perfectly valid according to HTTP
-                // specs...) cURL does unfortunately return an error in this case ("transfer closed transfer closed with
-                // ... bytes remaining to read") this can be circumvented by explicitly telling cURL to ignore the
-                // response body
-                $curlSettings[CURLOPT_NOBODY] = true;
-                $curlSettings[CURLOPT_CUSTOMREQUEST] = 'HEAD';
-                break;
-
-            default:
-                $curlSettings[CURLOPT_CUSTOMREQUEST] = $method;
-                break;
-
-        }
-
-        // Adding HTTP headers
-        $nHeaders = array();
-        foreach($headers as $key=>$value) {
-
-            $nHeaders[] = $key . ': ' . $value;
-
-        }
-        $curlSettings[CURLOPT_HTTPHEADER] = $nHeaders;
-
-        if ($this->proxy) {
-            $curlSettings[CURLOPT_PROXY] = $this->proxy;
-        }
-
-        if ($this->userName && $this->authType) {
-            $curlType = 0;
-            if ($this->authType & self::AUTH_BASIC) {
-                $curlType |= CURLAUTH_BASIC;
-            }
-            if ($this->authType & self::AUTH_DIGEST) {
-                $curlType |= CURLAUTH_DIGEST;
-            }
-            $curlSettings[CURLOPT_HTTPAUTH] = $curlType;
-            $curlSettings[CURLOPT_USERPWD] = $this->userName . ':' . $this->password;
-        }
-
-        list(
-            $response,
-            $curlInfo,
-            $curlErrNo,
-            $curlError
-        ) = $this->curlRequest($url, $curlSettings);
-
-        $headerBlob = substr($response, 0, $curlInfo['header_size']);
-        $response = substr($response, $curlInfo['header_size']);
-
-        // In the case of 100 Continue, or redirects we'll have multiple lists
-        // of headers for each separate HTTP response. We can easily split this
-        // because they are separated by \r\n\r\n
-        $headerBlob = explode("\r\n\r\n", trim($headerBlob, "\r\n"));
-
-        // We only care about the last set of headers
-        $headerBlob = $headerBlob[count($headerBlob)-1];
-
-        // Splitting headers
-        $headerBlob = explode("\r\n", $headerBlob);
-
-        $headers = array();
-        foreach($headerBlob as $header) {
-            $parts = explode(':', $header, 2);
-            if (count($parts)==2) {
-                $headers[strtolower(trim($parts[0]))] = trim($parts[1]);
-            }
-        }
-
-        $response = array(
-            'body' => $response,
-            'statusCode' => $curlInfo['http_code'],
-            'headers' => $headers
-        );
-
-        if ($curlErrNo) {
-            throw new Exception('[CURL] Error while making request: ' . $curlError . ' (error code: ' . $curlErrNo . ')');
-        }
-
-        if ($response['statusCode']>=400) {
-            switch ($response['statusCode']) {
-                case 400 :
-                    throw new Exception\BadRequest('Bad request');
-                case 401 :
-                    throw new Exception\NotAuthenticated('Not authenticated');
-                case 402 :
-                    throw new Exception\PaymentRequired('Payment required');
-                case 403 :
-                    throw new Exception\Forbidden('Forbidden');
-                case 404:
-                    throw new Exception\NotFound('Resource not found.');
-                case 405 :
-                    throw new Exception\MethodNotAllowed('Method not allowed');
-                case 409 :
-                    throw new Exception\Conflict('Conflict');
-                case 412 :
-                    throw new Exception\PreconditionFailed('Precondition failed');
-                case 416 :
-                    throw new Exception\RequestedRangeNotSatisfiable('Requested Range Not Satisfiable');
-                case 500 :
-                    throw new Exception('Internal server error');
-                case 501 :
-                    throw new Exception\NotImplemented('Not Implemented');
-                case 507 :
-                    throw new Exception\InsufficientStorage('Insufficient storage');
-                default:
-                    throw new Exception('HTTP error response. (errorcode ' . $response['statusCode'] . ')');
-            }
-        }
-
-        return $response;
-
-    }
-
-    /**
-     * Wrapper for all curl functions.
-     *
-     * The only reason this was split out in a separate method, is so it
-     * becomes easier to unittest.
-     *
-     * @param string $url
-     * @param array $settings
-     * @return array
-     */
-    // @codeCoverageIgnoreStart
-    protected function curlRequest($url, $settings) {
-
-        $curl = curl_init($url);
-        curl_setopt_array($curl, $settings);
-
-        return array(
-            curl_exec($curl),
-            curl_getinfo($curl),
-            curl_errno($curl),
-            curl_error($curl)
-        );
-
-    }
-    // @codeCoverageIgnoreEnd
-
-    /**
-     * Returns the full url based on the given url (which may be relative). All
-     * urls are expanded based on the base url as given by the server.
-     *
-     * @param string $url
-     * @return string
-     */
-    protected function getAbsoluteUrl($url) {
-
-        // If the url starts with http:// or https://, the url is already absolute.
-        if (preg_match('/^http(s?):\/\//', $url)) {
-            return $url;
-        }
-
-        // If the url starts with a slash, we must calculate the url based off
-        // the root of the base url.
-        if (strpos($url,'/') === 0) {
-            $parts = parse_url($this->baseUri);
-            return $parts['scheme'] . '://' . $parts['host'] . (isset($parts['port'])?':' . $parts['port']:'') . $url;
-        }
-
-        // Otherwise...
-        return $this->baseUri . $url;
-
-    }
-
-    /**
-     * Parses a WebDAV multistatus response body
-     *
-     * This method returns an array with the following structure
-     *
-     * array(
-     *   'url/to/resource' => array(
-     *     '200' => array(
-     *        '{DAV:}property1' => 'value1',
-     *        '{DAV:}property2' => 'value2',
-     *     ),
-     *     '404' => array(
-     *        '{DAV:}property1' => null,
-     *        '{DAV:}property2' => null,
-     *     ),
-     *   )
-     *   'url/to/resource2' => array(
-     *      .. etc ..
-     *   )
-     * )
-     *
-     *
-     * @param string $body xml body
-     * @return array
-     */
-    public function parseMultiStatus($body) {
-
-        $body = XMLUtil::convertDAVNamespace($body);
-
-        // Fixes an XXE vulnerability on PHP versions older than 5.3.23 or
-        // 5.4.13.
-        $previous = libxml_disable_entity_loader(true);
-        $responseXML = simplexml_load_string($body, null, LIBXML_NOBLANKS | LIBXML_NOCDATA);
-        libxml_disable_entity_loader($previous);
-
-        if ($responseXML===false) {
-            throw new \InvalidArgumentException('The passed data is not valid XML');
-        }
-
-        $responseXML->registerXPathNamespace('d', 'urn:DAV');
-
-        $propResult = array();
-
-        foreach($responseXML->xpath('d:response') as $response) {
-            $response->registerXPathNamespace('d', 'urn:DAV');
-            $href = $response->xpath('d:href');
-            $href = (string)$href[0];
-
-            $properties = array();
-
-            foreach($response->xpath('d:propstat') as $propStat) {
-
-                $propStat->registerXPathNamespace('d', 'urn:DAV');
-                $status = $propStat->xpath('d:status');
-                list($httpVersion, $statusCode, $message) = explode(' ', (string)$status[0],3);
-
-                // Only using the propertymap for results with status 200.
-                $propertyMap = $statusCode==='200' ? $this->propertyMap : array();
-
-                $properties[$statusCode] = XMLUtil::parseProperties(dom_import_simplexml($propStat), $propertyMap);
-
-            }
-
-            $propResult[$href] = $properties;
-
-        }
-
-        return $propResult;
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Exception/FileNotFound.php b/vendor/sabre/dav/lib/Sabre/DAV/Exception/FileNotFound.php
deleted file mode 100644
index aa4844cb9..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Exception/FileNotFound.php
+++ /dev/null
@@ -1,19 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Exception;
-
-/**
- * FileNotFound
- *
- * Deprecated: Warning, this class is deprecated and will be removed in a
- * future version of SabreDAV. Please use Sabre\DAV\Exception\NotFound instead.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @deprecated Use Sabre\DAV\Exception\NotFound instead
- * @license http://sabre.io/license/ Modified BSD License
- */
-class FileNotFound extends NotFound {
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/FSExt/Directory.php b/vendor/sabre/dav/lib/Sabre/DAV/FSExt/Directory.php
deleted file mode 100644
index da3d2cc69..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/FSExt/Directory.php
+++ /dev/null
@@ -1,159 +0,0 @@
-<?php
-
-namespace Sabre\DAV\FSExt;
-
-use Sabre\DAV;
-
-/**
- * Directory class
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Directory extends Node implements DAV\ICollection, DAV\IQuota {
-
-    /**
-     * Creates a new file in the directory
-     *
-     * Data will either be supplied as a stream resource, or in certain cases
-     * as a string. Keep in mind that you may have to support either.
-     *
-     * After successful creation of the file, you may choose to return the ETag
-     * of the new file here.
-     *
-     * The returned ETag must be surrounded by double-quotes (The quotes should
-     * be part of the actual string).
-     *
-     * If you cannot accurately determine the ETag, you should not return it.
-     * If you don't store the file exactly as-is (you're transforming it
-     * somehow) you should also not return an ETag.
-     *
-     * This means that if a subsequent GET to this new file does not exactly
-     * return the same contents of what was submitted here, you are strongly
-     * recommended to omit the ETag.
-     *
-     * @param string $name Name of the file
-     * @param resource|string $data Initial payload
-     * @return null|string
-     */
-    public function createFile($name, $data = null) {
-
-        // We're not allowing dots
-        if ($name=='.' || $name=='..') throw new DAV\Exception\Forbidden('Permission denied to . and ..');
-        $newPath = $this->path . '/' . $name;
-        file_put_contents($newPath,$data);
-
-        return '"' . md5_file($newPath) . '"';
-
-    }
-
-    /**
-     * Creates a new subdirectory
-     *
-     * @param string $name
-     * @return void
-     */
-    public function createDirectory($name) {
-
-        // We're not allowing dots
-        if ($name=='.' || $name=='..') throw new DAV\Exception\Forbidden('Permission denied to . and ..');
-        $newPath = $this->path . '/' . $name;
-        mkdir($newPath);
-
-    }
-
-    /**
-     * Returns a specific child node, referenced by its name
-     *
-     * This method must throw Sabre\DAV\Exception\NotFound if the node does not
-     * exist.
-     *
-     * @param string $name
-     * @throws DAV\Exception\NotFound
-     * @return DAV\INode
-     */
-    public function getChild($name) {
-
-        $path = $this->path . '/' . $name;
-
-        if (!file_exists($path)) throw new DAV\Exception\NotFound('File could not be located');
-        if ($name=='.' || $name=='..') throw new DAV\Exception\Forbidden('Permission denied to . and ..');
-
-        if (is_dir($path)) {
-
-            return new Directory($path);
-
-        } else {
-
-            return new File($path);
-
-        }
-
-    }
-
-    /**
-     * Checks if a child exists.
-     *
-     * @param string $name
-     * @return bool
-     */
-    public function childExists($name) {
-
-        if ($name=='.' || $name=='..')
-            throw new DAV\Exception\Forbidden('Permission denied to . and ..');
-
-        $path = $this->path . '/' . $name;
-        return file_exists($path);
-
-    }
-
-    /**
-     * Returns an array with all the child nodes
-     *
-     * @return DAV\INode[]
-     */
-    public function getChildren() {
-
-        $nodes = array();
-        foreach(scandir($this->path) as $node) if($node!='.' && $node!='..' && $node!='.sabredav') $nodes[] = $this->getChild($node);
-        return $nodes;
-
-    }
-
-    /**
-     * Deletes all files in this directory, and then itself
-     *
-     * @return bool
-     */
-    public function delete() {
-
-        // Deleting all children
-        foreach($this->getChildren() as $child) $child->delete();
-
-        // Removing resource info, if its still around
-        if (file_exists($this->path . '/.sabredav')) unlink($this->path . '/.sabredav');
-
-        // Removing the directory itself
-        rmdir($this->path);
-
-        return parent::delete();
-
-    }
-
-    /**
-     * Returns available diskspace information
-     *
-     * @return array
-     */
-    public function getQuotaInfo() {
-
-        return array(
-            disk_total_space($this->path)-disk_free_space($this->path),
-            disk_free_space($this->path)
-            );
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/FSExt/Node.php b/vendor/sabre/dav/lib/Sabre/DAV/FSExt/Node.php
deleted file mode 100644
index 0e11582f3..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/FSExt/Node.php
+++ /dev/null
@@ -1,214 +0,0 @@
-<?php
-
-namespace Sabre\DAV\FSExt;
-
-use Sabre\DAV;
-
-/**
- * Base node-class
- *
- * The node class implements the method used by both the File and the Directory classes
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-abstract class Node extends DAV\FS\Node implements DAV\IProperties {
-
-    /**
-     * Updates properties on this node,
-     *
-     * @param array $properties
-     * @see Sabre\DAV\IProperties::updateProperties
-     * @return bool|array
-     */
-    public function updateProperties($properties) {
-
-        $resourceData = $this->getResourceData();
-
-        foreach($properties as $propertyName=>$propertyValue) {
-
-            // If it was null, we need to delete the property
-            if (is_null($propertyValue)) {
-                if (isset($resourceData['properties'][$propertyName])) {
-                    unset($resourceData['properties'][$propertyName]);
-                }
-            } else {
-                $resourceData['properties'][$propertyName] = $propertyValue;
-            }
-
-        }
-
-        $this->putResourceData($resourceData);
-        return true;
-    }
-
-    /**
-     * Returns a list of properties for this nodes.;
-     *
-     * The properties list is a list of propertynames the client requested, encoded as xmlnamespace#tagName, for example: http://www.example.org/namespace#author
-     * If the array is empty, all properties should be returned
-     *
-     * @param array $properties
-     * @return array
-     */
-    function getProperties($properties) {
-
-        $resourceData = $this->getResourceData();
-
-        // if the array was empty, we need to return everything
-        if (!$properties) return $resourceData['properties'];
-
-        $props = array();
-        foreach($properties as $property) {
-            if (isset($resourceData['properties'][$property])) $props[$property] = $resourceData['properties'][$property];
-        }
-
-        return $props;
-
-    }
-
-    /**
-     * Returns the path to the resource file
-     *
-     * @return string
-     */
-    protected function getResourceInfoPath() {
-
-        list($parentDir) = DAV\URLUtil::splitPath($this->path);
-        return $parentDir . '/.sabredav';
-
-    }
-
-    /**
-     * Returns all the stored resource information
-     *
-     * @return array
-     */
-    protected function getResourceData() {
-
-        $path = $this->getResourceInfoPath();
-        if (!file_exists($path)) return array('properties' => array());
-
-        // opening up the file, and creating a shared lock
-        $handle = fopen($path,'r');
-        flock($handle,LOCK_SH);
-        $data = '';
-
-        // Reading data until the eof
-        while(!feof($handle)) {
-            $data.=fread($handle,8192);
-        }
-
-        // We're all good
-        fclose($handle);
-
-        // Unserializing and checking if the resource file contains data for this file
-        $data = unserialize($data);
-        if (!isset($data[$this->getName()])) {
-            return array('properties' => array());
-        }
-
-        $data = $data[$this->getName()];
-        if (!isset($data['properties'])) $data['properties'] = array();
-        return $data;
-
-    }
-
-    /**
-     * Updates the resource information
-     *
-     * @param array $newData
-     * @return void
-     */
-    protected function putResourceData(array $newData) {
-
-        $path = $this->getResourceInfoPath();
-
-        // opening up the file, and creating a shared lock
-        $handle = fopen($path,'a+');
-        flock($handle,LOCK_EX);
-        $data = '';
-
-        rewind($handle);
-
-        // Reading data until the eof
-        while(!feof($handle)) {
-            $data.=fread($handle,8192);
-        }
-
-        // Unserializing and checking if the resource file contains data for this file
-        $data = unserialize($data);
-        $data[$this->getName()] = $newData;
-        ftruncate($handle,0);
-        rewind($handle);
-
-        fwrite($handle,serialize($data));
-        fclose($handle);
-
-    }
-
-    /**
-     * Renames the node
-     *
-     * @param string $name The new name
-     * @return void
-     */
-    public function setName($name) {
-
-        list($parentPath, ) = DAV\URLUtil::splitPath($this->path);
-        list(, $newName) = DAV\URLUtil::splitPath($name);
-        $newPath = $parentPath . '/' . $newName;
-
-        // We're deleting the existing resourcedata, and recreating it
-        // for the new path.
-        $resourceData = $this->getResourceData();
-        $this->deleteResourceData();
-
-        rename($this->path,$newPath);
-        $this->path = $newPath;
-        $this->putResourceData($resourceData);
-
-
-    }
-
-    /**
-     * @return bool
-     */
-    public function deleteResourceData() {
-
-        // When we're deleting this node, we also need to delete any resource information
-        $path = $this->getResourceInfoPath();
-        if (!file_exists($path)) return true;
-
-        // opening up the file, and creating a shared lock
-        $handle = fopen($path,'a+');
-        flock($handle,LOCK_EX);
-        $data = '';
-
-        rewind($handle);
-
-        // Reading data until the eof
-        while(!feof($handle)) {
-            $data.=fread($handle,8192);
-        }
-
-        // Unserializing and checking if the resource file contains data for this file
-        $data = unserialize($data);
-        if (isset($data[$this->getName()])) unset($data[$this->getName()]);
-        ftruncate($handle,0);
-        rewind($handle);
-        fwrite($handle,serialize($data));
-        fclose($handle);
-
-        return true;
-    }
-
-    public function delete() {
-
-        return $this->deleteResourceData();
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/IExtendedCollection.php b/vendor/sabre/dav/lib/Sabre/DAV/IExtendedCollection.php
deleted file mode 100644
index 8d3748467..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/IExtendedCollection.php
+++ /dev/null
@@ -1,28 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-
-/**
- * The IExtendedCollection interface.
- *
- * This interface can be used to create special-type of collection-resources
- * as defined by RFC 5689.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-interface IExtendedCollection extends ICollection {
-
-    /**
-     * Creates a new collection
-     *
-     * @param string $name
-     * @param array $resourceType
-     * @param array $properties
-     * @return void
-     */
-    function createExtendedCollection($name, array $resourceType, array $properties);
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/IProperties.php b/vendor/sabre/dav/lib/Sabre/DAV/IProperties.php
deleted file mode 100644
index f3601575b..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/IProperties.php
+++ /dev/null
@@ -1,71 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-
-/**
- * IProperties interface
- *
- * Implement this interface to support custom WebDAV properties requested and sent from clients.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-interface IProperties extends INode {
-
-    /**
-     * Updates properties on this node,
-     *
-     * The properties array uses the propertyName in clark-notation as key,
-     * and the array value for the property value. In the case a property
-     * should be deleted, the property value will be null.
-     *
-     * This method must be atomic. If one property cannot be changed, the
-     * entire operation must fail.
-     *
-     * If the operation was successful, true can be returned.
-     * If the operation failed, false can be returned.
-     *
-     * Deletion of a non-existent property is always successful.
-     *
-     * Lastly, it is optional to return detailed information about any
-     * failures. In this case an array should be returned with the following
-     * structure:
-     *
-     * array(
-     *   403 => array(
-     *      '{DAV:}displayname' => null,
-     *   ),
-     *   424 => array(
-     *      '{DAV:}owner' => null,
-     *   )
-     * )
-     *
-     * In this example it was forbidden to update {DAV:}displayname.
-     * (403 Forbidden), which in turn also caused {DAV:}owner to fail
-     * (424 Failed Dependency) because the request needs to be atomic.
-     *
-     * @param array $mutations
-     * @return bool|array
-     */
-    function updateProperties($mutations);
-
-    /**
-     * Returns a list of properties for this nodes.
-     *
-     * The properties list is a list of propertynames the client requested,
-     * encoded in clark-notation {xmlnamespace}tagname
-     *
-     * If the array is empty, it means 'all properties' were requested.
-     *
-     * Note that it's fine to liberally give properties back, instead of
-     * conforming to the list of requested properties.
-     * The Server class will filter out the extra.
-     *
-     * @param array $properties
-     * @return void
-     */
-    function getProperties($properties);
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/FS.php b/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/FS.php
deleted file mode 100644
index a9b0aaaaf..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Backend/FS.php
+++ /dev/null
@@ -1,193 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Locks\Backend;
-
-use Sabre\DAV\Locks\LockInfo;
-
-/**
- * This Lock Backend stores all its data in the filesystem in separate file per
- * node.
- *
- * This Lock Manager is now deprecated. It has a bug that allows parent
- * collections to be deletes when children deeper in the tree are locked.
- *
- * This also means that using this backend means you will not pass the Neon
- * Litmus test.
- *
- * You are recommended to use either the PDO or the File backend instead.
- *
- * @deprecated
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class FS extends AbstractBackend {
-
-    /**
-     * The default data directory
-     *
-     * @var string
-     */
-    private $dataDir;
-
-    public function __construct($dataDir) {
-
-        $this->dataDir = $dataDir;
-
-    }
-
-    protected function getFileNameForUri($uri) {
-
-        return $this->dataDir . '/sabredav_' . md5($uri) . '.locks';
-
-    }
-
-
-    /**
-     * Returns a list of Sabre\DAV\Locks\LockInfo objects
-     *
-     * This method should return all the locks for a particular uri, including
-     * locks that might be set on a parent uri.
-     *
-     * If returnChildLocks is set to true, this method should also look for
-     * any locks in the subtree of the uri for locks.
-     *
-     * @param string $uri
-     * @param bool $returnChildLocks
-     * @return array
-     */
-    public function getLocks($uri, $returnChildLocks) {
-
-        $lockList = array();
-        $currentPath = '';
-
-        foreach(explode('/',$uri) as $uriPart) {
-
-            // weird algorithm that can probably be improved, but we're traversing the path top down
-            if ($currentPath) $currentPath.='/';
-            $currentPath.=$uriPart;
-
-            $uriLocks = $this->getData($currentPath);
-
-            foreach($uriLocks as $uriLock) {
-
-                // Unless we're on the leaf of the uri-tree we should ignore locks with depth 0
-                if($uri==$currentPath || $uriLock->depth!=0) {
-                    $uriLock->uri = $currentPath;
-                    $lockList[] = $uriLock;
-                }
-
-            }
-
-        }
-
-        // Checking if we can remove any of these locks
-        foreach($lockList as $k=>$lock) {
-            if (time() > $lock->timeout + $lock->created) unset($lockList[$k]);
-        }
-        return $lockList;
-
-    }
-
-    /**
-     * Locks a uri
-     *
-     * @param string $uri
-     * @param LockInfo $lockInfo
-     * @return bool
-     */
-    public function lock($uri, LockInfo $lockInfo) {
-
-        // We're making the lock timeout 30 minutes
-        $lockInfo->timeout = 1800;
-        $lockInfo->created = time();
-
-        $locks = $this->getLocks($uri,false);
-        foreach($locks as $k=>$lock) {
-            if ($lock->token == $lockInfo->token) unset($locks[$k]);
-        }
-        $locks[] = $lockInfo;
-        $this->putData($uri,$locks);
-        return true;
-
-    }
-
-    /**
-     * Removes a lock from a uri
-     *
-     * @param string $uri
-     * @param LockInfo $lockInfo
-     * @return bool
-     */
-    public function unlock($uri, LockInfo $lockInfo) {
-
-        $locks = $this->getLocks($uri,false);
-        foreach($locks as $k=>$lock) {
-
-            if ($lock->token == $lockInfo->token) {
-
-                unset($locks[$k]);
-                $this->putData($uri,$locks);
-                return true;
-
-            }
-        }
-        return false;
-
-    }
-
-    /**
-     * Returns the stored data for a uri
-     *
-     * @param string $uri
-     * @return array
-     */
-    protected function getData($uri) {
-
-        $path = $this->getFilenameForUri($uri);
-        if (!file_exists($path)) return array();
-
-        // opening up the file, and creating a shared lock
-        $handle = fopen($path,'r');
-        flock($handle,LOCK_SH);
-        $data = '';
-
-        // Reading data until the eof
-        while(!feof($handle)) {
-            $data.=fread($handle,8192);
-        }
-
-        // We're all good
-        fclose($handle);
-
-        // Unserializing and checking if the resource file contains data for this file
-        $data = unserialize($data);
-        if (!$data) return array();
-        return $data;
-
-    }
-
-    /**
-     * Updates the lock information
-     *
-     * @param string $uri
-     * @param array $newData
-     * @return void
-     */
-    protected function putData($uri,array $newData) {
-
-        $path = $this->getFileNameForUri($uri);
-
-        // opening up the file, and creating a shared lock
-        $handle = fopen($path,'a+');
-        flock($handle,LOCK_EX);
-        ftruncate($handle,0);
-        rewind($handle);
-
-        fwrite($handle,serialize($newData));
-        fclose($handle);
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Plugin.php b/vendor/sabre/dav/lib/Sabre/DAV/Locks/Plugin.php
deleted file mode 100644
index 001f8175d..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Locks/Plugin.php
+++ /dev/null
@@ -1,649 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Locks;
-
-use Sabre\DAV;
-
-/**
- * Locking plugin
- *
- * This plugin provides locking support to a WebDAV server.
- * The easiest way to get started, is by hooking it up as such:
- *
- * $lockBackend = new Sabre\DAV\Locks\Backend\File('./mylockdb');
- * $lockPlugin = new Sabre\DAV\Locks\Plugin($lockBackend);
- * $server->addPlugin($lockPlugin);
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Plugin extends DAV\ServerPlugin {
-
-    /**
-     * locksBackend
-     *
-     * @var Backend\Backend\Interface
-     */
-    protected $locksBackend;
-
-    /**
-     * server
-     *
-     * @var Sabre\DAV\Server
-     */
-    protected $server;
-
-    /**
-     * __construct
-     *
-     * @param Backend\BackendInterface $locksBackend
-     */
-    public function __construct(Backend\BackendInterface $locksBackend = null) {
-
-        $this->locksBackend = $locksBackend;
-
-    }
-
-    /**
-     * Initializes the plugin
-     *
-     * This method is automatically called by the Server class after addPlugin.
-     *
-     * @param DAV\Server $server
-     * @return void
-     */
-    public function initialize(DAV\Server $server) {
-
-        $this->server = $server;
-        $server->subscribeEvent('unknownMethod',array($this,'unknownMethod'));
-        $server->subscribeEvent('beforeMethod',array($this,'beforeMethod'),50);
-        $server->subscribeEvent('afterGetProperties',array($this,'afterGetProperties'));
-
-    }
-
-    /**
-     * Returns a plugin name.
-     *
-     * Using this name other plugins will be able to access other plugins
-     * using Sabre\DAV\Server::getPlugin
-     *
-     * @return string
-     */
-    public function getPluginName() {
-
-        return 'locks';
-
-    }
-
-    /**
-     * This method is called by the Server if the user used an HTTP method
-     * the server didn't recognize.
-     *
-     * This plugin intercepts the LOCK and UNLOCK methods.
-     *
-     * @param string $method
-     * @param string $uri
-     * @return bool
-     */
-    public function unknownMethod($method, $uri) {
-
-        switch($method) {
-
-            case 'LOCK'   : $this->httpLock($uri); return false;
-            case 'UNLOCK' : $this->httpUnlock($uri); return false;
-
-        }
-
-    }
-
-    /**
-     * This method is called after most properties have been found
-     * it allows us to add in any Lock-related properties
-     *
-     * @param string $path
-     * @param array $newProperties
-     * @return bool
-     */
-    public function afterGetProperties($path, &$newProperties) {
-
-        foreach($newProperties[404] as $propName=>$discard) {
-
-            switch($propName) {
-
-                case '{DAV:}supportedlock' :
-                    $val = false;
-                    if ($this->locksBackend) $val = true;
-                    $newProperties[200][$propName] = new DAV\Property\SupportedLock($val);
-                    unset($newProperties[404][$propName]);
-                    break;
-
-                case '{DAV:}lockdiscovery' :
-                    $newProperties[200][$propName] = new DAV\Property\LockDiscovery($this->getLocks($path));
-                    unset($newProperties[404][$propName]);
-                    break;
-
-            }
-
-
-        }
-        return true;
-
-    }
-
-
-    /**
-     * This method is called before the logic for any HTTP method is
-     * handled.
-     *
-     * This plugin uses that feature to intercept access to locked resources.
-     *
-     * @param string $method
-     * @param string $uri
-     * @return bool
-     */
-    public function beforeMethod($method, $uri) {
-
-        switch($method) {
-
-            case 'DELETE' :
-                $lastLock = null;
-                if (!$this->validateLock($uri,$lastLock, true))
-                    throw new DAV\Exception\Locked($lastLock);
-                break;
-            case 'MKCOL' :
-            case 'PROPPATCH' :
-            case 'PUT' :
-            case 'PATCH' :
-                $lastLock = null;
-                if (!$this->validateLock($uri,$lastLock))
-                    throw new DAV\Exception\Locked($lastLock);
-                break;
-            case 'MOVE' :
-                $lastLock = null;
-                if (!$this->validateLock(array(
-                      $uri,
-                      $this->server->calculateUri($this->server->httpRequest->getHeader('Destination')),
-                    ),$lastLock, true))
-                        throw new DAV\Exception\Locked($lastLock);
-                break;
-            case 'COPY' :
-                $lastLock = null;
-                if (!$this->validateLock(
-                      $this->server->calculateUri($this->server->httpRequest->getHeader('Destination')),
-                      $lastLock, true))
-                        throw new DAV\Exception\Locked($lastLock);
-                break;
-        }
-
-        return true;
-
-    }
-
-    /**
-     * Use this method to tell the server this plugin defines additional
-     * HTTP methods.
-     *
-     * This method is passed a uri. It should only return HTTP methods that are
-     * available for the specified uri.
-     *
-     * @param string $uri
-     * @return array
-     */
-    public function getHTTPMethods($uri) {
-
-        if ($this->locksBackend)
-            return array('LOCK','UNLOCK');
-
-        return array();
-
-    }
-
-    /**
-     * Returns a list of features for the HTTP OPTIONS Dav: header.
-     *
-     * In this case this is only the number 2. The 2 in the Dav: header
-     * indicates the server supports locks.
-     *
-     * @return array
-     */
-    public function getFeatures() {
-
-        return array(2);
-
-    }
-
-    /**
-     * Returns all lock information on a particular uri
-     *
-     * This function should return an array with Sabre\DAV\Locks\LockInfo objects. If there are no locks on a file, return an empty array.
-     *
-     * Additionally there is also the possibility of locks on parent nodes, so we'll need to traverse every part of the tree
-     * If the $returnChildLocks argument is set to true, we'll also traverse all the children of the object
-     * for any possible locks and return those as well.
-     *
-     * @param string $uri
-     * @param bool $returnChildLocks
-     * @return array
-     */
-    public function getLocks($uri, $returnChildLocks = false) {
-
-        $lockList = array();
-
-        if ($this->locksBackend)
-            $lockList = array_merge($lockList,$this->locksBackend->getLocks($uri, $returnChildLocks));
-
-        return $lockList;
-
-    }
-
-    /**
-     * Locks an uri
-     *
-     * The WebDAV lock request can be operated to either create a new lock on a file, or to refresh an existing lock
-     * If a new lock is created, a full XML body should be supplied, containing information about the lock such as the type
-     * of lock (shared or exclusive) and the owner of the lock
-     *
-     * If a lock is to be refreshed, no body should be supplied and there should be a valid If header containing the lock
-     *
-     * Additionally, a lock can be requested for a non-existent file. In these case we're obligated to create an empty file as per RFC4918:S7.3
-     *
-     * @param string $uri
-     * @return void
-     */
-    protected function httpLock($uri) {
-
-        $lastLock = null;
-        if (!$this->validateLock($uri,$lastLock)) {
-
-            // If the existing lock was an exclusive lock, we need to fail
-            if (!$lastLock || $lastLock->scope == LockInfo::EXCLUSIVE) {
-                //var_dump($lastLock);
-                throw new DAV\Exception\ConflictingLock($lastLock);
-            }
-
-        }
-
-        if ($body = $this->server->httpRequest->getBody(true)) {
-            // This is a new lock request
-            $lockInfo = $this->parseLockRequest($body);
-            $lockInfo->depth = $this->server->getHTTPDepth();
-            $lockInfo->uri = $uri;
-            if($lastLock && $lockInfo->scope != LockInfo::SHARED) throw new DAV\Exception\ConflictingLock($lastLock);
-
-        } elseif ($lastLock) {
-
-            // This must have been a lock refresh
-            $lockInfo = $lastLock;
-
-            // The resource could have been locked through another uri.
-            if ($uri!=$lockInfo->uri) $uri = $lockInfo->uri;
-
-        } else {
-
-            // There was neither a lock refresh nor a new lock request
-            throw new DAV\Exception\BadRequest('An xml body is required for lock requests');
-
-        }
-
-        if ($timeout = $this->getTimeoutHeader()) $lockInfo->timeout = $timeout;
-
-        $newFile = false;
-
-        // If we got this far.. we should go check if this node actually exists. If this is not the case, we need to create it first
-        try {
-            $this->server->tree->getNodeForPath($uri);
-
-            // We need to call the beforeWriteContent event for RFC3744
-            // Edit: looks like this is not used, and causing problems now.
-            //
-            // See Issue 222
-            // $this->server->broadcastEvent('beforeWriteContent',array($uri));
-
-        } catch (DAV\Exception\NotFound $e) {
-
-            // It didn't, lets create it
-            $this->server->createFile($uri,fopen('php://memory','r'));
-            $newFile = true;
-
-        }
-
-        $this->lockNode($uri,$lockInfo);
-
-        $this->server->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->server->httpResponse->setHeader('Lock-Token','<opaquelocktoken:' . $lockInfo->token . '>');
-        $this->server->httpResponse->sendStatus($newFile?201:200);
-        $this->server->httpResponse->sendBody($this->generateLockResponse($lockInfo));
-
-    }
-
-    /**
-     * Unlocks a uri
-     *
-     * This WebDAV method allows you to remove a lock from a node. The client should provide a valid locktoken through the Lock-token http header
-     * The server should return 204 (No content) on success
-     *
-     * @param string $uri
-     * @return void
-     */
-    protected function httpUnlock($uri) {
-
-        $lockToken = $this->server->httpRequest->getHeader('Lock-Token');
-
-        // If the locktoken header is not supplied, we need to throw a bad request exception
-        if (!$lockToken) throw new DAV\Exception\BadRequest('No lock token was supplied');
-
-        $locks = $this->getLocks($uri);
-
-        // Windows sometimes forgets to include < and > in the Lock-Token
-        // header
-        if ($lockToken[0]!=='<') $lockToken = '<' . $lockToken . '>';
-
-        foreach($locks as $lock) {
-
-            if ('<opaquelocktoken:' . $lock->token . '>' == $lockToken) {
-
-                $this->unlockNode($uri,$lock);
-                $this->server->httpResponse->setHeader('Content-Length','0');
-                $this->server->httpResponse->sendStatus(204);
-                return;
-
-            }
-
-        }
-
-        // If we got here, it means the locktoken was invalid
-        throw new DAV\Exception\LockTokenMatchesRequestUri();
-
-    }
-
-    /**
-     * Locks a uri
-     *
-     * All the locking information is supplied in the lockInfo object. The object has a suggested timeout, but this can be safely ignored
-     * It is important that if the existing timeout is ignored, the property is overwritten, as this needs to be sent back to the client
-     *
-     * @param string $uri
-     * @param LockInfo $lockInfo
-     * @return bool
-     */
-    public function lockNode($uri,LockInfo $lockInfo) {
-
-        if (!$this->server->broadcastEvent('beforeLock',array($uri,$lockInfo))) return;
-
-        if ($this->locksBackend) return $this->locksBackend->lock($uri,$lockInfo);
-        throw new DAV\Exception\MethodNotAllowed('Locking support is not enabled for this resource. No Locking backend was found so if you didn\'t expect this error, please check your configuration.');
-
-    }
-
-    /**
-     * Unlocks a uri
-     *
-     * This method removes a lock from a uri. It is assumed all the supplied information is correct and verified
-     *
-     * @param string $uri
-     * @param LockInfo $lockInfo
-     * @return bool
-     */
-    public function unlockNode($uri, LockInfo $lockInfo) {
-
-        if (!$this->server->broadcastEvent('beforeUnlock',array($uri,$lockInfo))) return;
-        if ($this->locksBackend) return $this->locksBackend->unlock($uri,$lockInfo);
-
-    }
-
-
-    /**
-     * Returns the contents of the HTTP Timeout header.
-     *
-     * The method formats the header into an integer.
-     *
-     * @return int
-     */
-    public function getTimeoutHeader() {
-
-        $header = $this->server->httpRequest->getHeader('Timeout');
-
-        if ($header) {
-
-            if (stripos($header,'second-')===0) $header = (int)(substr($header,7));
-            else if (strtolower($header)=='infinite') $header = LockInfo::TIMEOUT_INFINITE;
-            else throw new DAV\Exception\BadRequest('Invalid HTTP timeout header');
-
-        } else {
-
-            $header = 0;
-
-        }
-
-        return $header;
-
-    }
-
-    /**
-     * Generates the response for successful LOCK requests
-     *
-     * @param LockInfo $lockInfo
-     * @return string
-     */
-    protected function generateLockResponse(LockInfo $lockInfo) {
-
-        $dom = new \DOMDocument('1.0','utf-8');
-        $dom->formatOutput = true;
-
-        $prop = $dom->createElementNS('DAV:','d:prop');
-        $dom->appendChild($prop);
-
-        $lockDiscovery = $dom->createElementNS('DAV:','d:lockdiscovery');
-        $prop->appendChild($lockDiscovery);
-
-        $lockObj = new DAV\Property\LockDiscovery(array($lockInfo),true);
-        $lockObj->serialize($this->server,$lockDiscovery);
-
-        return $dom->saveXML();
-
-    }
-
-    /**
-     * validateLock should be called when a write operation is about to happen
-     * It will check if the requested url is locked, and see if the correct lock tokens are passed
-     *
-     * @param mixed $urls List of relevant urls. Can be an array, a string or nothing at all for the current request uri
-     * @param mixed $lastLock This variable will be populated with the last checked lock object (Sabre\DAV\Locks\LockInfo)
-     * @param bool $checkChildLocks If set to true, this function will also look for any locks set on child resources of the supplied urls. This is needed for for example deletion of entire trees.
-     * @return bool
-     */
-    protected function validateLock($urls = null,&$lastLock = null, $checkChildLocks = false) {
-
-        if (is_null($urls)) {
-            $urls = array($this->server->getRequestUri());
-        } elseif (is_string($urls)) {
-            $urls = array($urls);
-        } elseif (!is_array($urls)) {
-            throw new DAV\Exception('The urls parameter should either be null, a string or an array');
-        }
-
-        $conditions = $this->getIfConditions();
-
-        // We're going to loop through the urls and make sure all lock conditions are satisfied
-        foreach($urls as $url) {
-
-            $locks = $this->getLocks($url, $checkChildLocks);
-
-            // If there were no conditions, but there were locks, we fail
-            if (!$conditions && $locks) {
-                reset($locks);
-                $lastLock = current($locks);
-                return false;
-            }
-
-            // If there were no locks or conditions, we go to the next url
-            if (!$locks && !$conditions) continue;
-
-            foreach($conditions as $condition) {
-
-                if (!$condition['uri']) {
-                    $conditionUri = $this->server->getRequestUri();
-                } else {
-                    $conditionUri = $this->server->calculateUri($condition['uri']);
-                }
-
-                // If the condition has a url, and it isn't part of the affected url at all, check the next condition
-                if ($conditionUri && strpos($url,$conditionUri)!==0) continue;
-
-                // The tokens array contians arrays with 2 elements. 0=true/false for normal/not condition, 1=locktoken
-                // At least 1 condition has to be satisfied
-                foreach($condition['tokens'] as $conditionToken) {
-
-                    $etagValid = true;
-                    $lockValid  = true;
-
-                    // key 2 can contain an etag
-                    if ($conditionToken[2]) {
-
-                        $uri = $conditionUri?$conditionUri:$this->server->getRequestUri();
-                        $node = $this->server->tree->getNodeForPath($uri);
-                        $etagValid = $node instanceof DAV\IFile && $node->getETag()==$conditionToken[2];
-
-                    }
-
-                    // key 1 can contain a lock token
-                    if ($conditionToken[1]) {
-
-                        $lockValid = false;
-                        // Match all the locks
-                        foreach($locks as $lockIndex=>$lock) {
-
-                            $lockToken = 'opaquelocktoken:' . $lock->token;
-
-                            // Checking NOT
-                            if (!$conditionToken[0] && $lockToken != $conditionToken[1]) {
-
-                                // Condition valid, onto the next
-                                $lockValid = true;
-                                break;
-                            }
-                            if ($conditionToken[0] && $lockToken == $conditionToken[1]) {
-
-                                $lastLock = $lock;
-                                // Condition valid and lock matched
-                                unset($locks[$lockIndex]);
-                                $lockValid = true;
-                                break;
-
-                            }
-
-                        }
-
-                    }
-
-                    // If, after checking both etags and locks they are stil valid,
-                    // we can continue with the next condition.
-                    if ($etagValid && $lockValid) continue 2;
-               }
-               // No conditions matched, so we fail
-               throw new DAV\Exception\PreconditionFailed('The tokens provided in the if header did not match','If');
-            }
-
-            // Conditions were met, we'll also need to check if all the locks are gone
-            if (count($locks)) {
-
-                reset($locks);
-
-                // There's still locks, we fail
-                $lastLock = current($locks);
-                return false;
-
-            }
-
-
-        }
-
-        // We got here, this means every condition was satisfied
-        return true;
-
-    }
-
-    /**
-     * This method is created to extract information from the WebDAV HTTP 'If:' header
-     *
-     * The If header can be quite complex, and has a bunch of features. We're using a regex to extract all relevant information
-     * The function will return an array, containing structs with the following keys
-     *
-     *   * uri   - the uri the condition applies to. If this is returned as an
-     *     empty string, this implies it's referring to the request url.
-     *   * tokens - The lock token. another 2 dimensional array containing 2 elements (0 = true/false.. If this is a negative condition its set to false, 1 = the actual token)
-     *   * etag - an etag, if supplied
-     *
-     * @return array
-     */
-    public function getIfConditions() {
-
-        $header = $this->server->httpRequest->getHeader('If');
-        if (!$header) return array();
-
-        $matches = array();
-
-        $regex = '/(?:\<(?P<uri>.*?)\>\s)?\((?P<not>Not\s)?(?:\<(?P<token>[^\>]*)\>)?(?:\s?)(?:\[(?P<etag>[^\]]*)\])?\)/im';
-        preg_match_all($regex,$header,$matches,PREG_SET_ORDER);
-
-        $conditions = array();
-
-        foreach($matches as $match) {
-
-            $condition = array(
-                'uri'   => $match['uri'],
-                'tokens' => array(
-                    array($match['not']?0:1,$match['token'],isset($match['etag'])?$match['etag']:'')
-                ),
-            );
-
-            if (!$condition['uri'] && count($conditions)) $conditions[count($conditions)-1]['tokens'][] = array(
-                $match['not']?0:1,
-                $match['token'],
-                isset($match['etag'])?$match['etag']:''
-            );
-            else {
-                $conditions[] = $condition;
-            }
-
-        }
-
-        return $conditions;
-
-    }
-
-    /**
-     * Parses a webdav lock xml body, and returns a new Sabre\DAV\Locks\LockInfo object
-     *
-     * @param string $body
-     * @return DAV\Locks\LockInfo
-     */
-    protected function parseLockRequest($body) {
-
-        // Fixes an XXE vulnerability on PHP versions older than 5.3.23 or
-        // 5.4.13.
-        $previous = libxml_disable_entity_loader(true);
-
-
-        $xml = simplexml_load_string(
-            DAV\XMLUtil::convertDAVNamespace($body),
-            null,
-            LIBXML_NOWARNING);
-        libxml_disable_entity_loader($previous);
-
-        $xml->registerXPathNamespace('d','urn:DAV');
-        $lockInfo = new LockInfo();
-
-        $children = $xml->children("urn:DAV");
-        $lockInfo->owner = (string)$children->owner;
-
-        $lockInfo->token = DAV\UUIDUtil::getUUID();
-        $lockInfo->scope = count($xml->xpath('d:lockscope/d:exclusive'))>0 ? LockInfo::EXCLUSIVE : LockInfo::SHARED;
-
-        return $lockInfo;
-
-    }
-
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/ObjectTree.php b/vendor/sabre/dav/lib/Sabre/DAV/ObjectTree.php
deleted file mode 100644
index 3e7c0fcf8..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/ObjectTree.php
+++ /dev/null
@@ -1,159 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-
-/**
- * ObjectTree class
- *
- * This implementation of the Tree class makes use of the INode, IFile and ICollection API's
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class ObjectTree extends Tree {
-
-    /**
-     * The root node
-     *
-     * @var ICollection
-     */
-    protected $rootNode;
-
-    /**
-     * This is the node cache. Accessed nodes are stored here
-     *
-     * @var array
-     */
-    protected $cache = array();
-
-    /**
-     * Creates the object
-     *
-     * This method expects the rootObject to be passed as a parameter
-     *
-     * @param ICollection $rootNode
-     */
-    public function __construct(ICollection $rootNode) {
-
-        $this->rootNode = $rootNode;
-
-    }
-
-    /**
-     * Returns the INode object for the requested path
-     *
-     * @param string $path
-     * @return INode
-     */
-    public function getNodeForPath($path) {
-
-        $path = trim($path,'/');
-        if (isset($this->cache[$path])) return $this->cache[$path];
-
-        // Is it the root node?
-        if (!strlen($path)) {
-            return $this->rootNode;
-        }
-
-        // Attempting to fetch its parent
-        list($parentName, $baseName) = URLUtil::splitPath($path);
-
-        // If there was no parent, we must simply ask it from the root node.
-        if ($parentName==="") {
-            $node = $this->rootNode->getChild($baseName);
-        } else {
-            // Otherwise, we recursively grab the parent and ask him/her.
-            $parent = $this->getNodeForPath($parentName);
-
-            if (!($parent instanceof ICollection))
-                throw new Exception\NotFound('Could not find node at path: ' . $path);
-
-            $node = $parent->getChild($baseName);
-
-        }
-
-        $this->cache[$path] = $node;
-        return $node;
-
-    }
-
-    /**
-     * This function allows you to check if a node exists.
-     *
-     * @param string $path
-     * @return bool
-     */
-    public function nodeExists($path) {
-
-        try {
-
-            // The root always exists
-            if ($path==='') return true;
-
-            list($parent, $base) = URLUtil::splitPath($path);
-
-            $parentNode = $this->getNodeForPath($parent);
-            if (!$parentNode instanceof ICollection) return false;
-            return $parentNode->childExists($base);
-
-        } catch (Exception\NotFound $e) {
-
-            return false;
-
-        }
-
-    }
-
-    /**
-     * Returns a list of childnodes for a given path.
-     *
-     * @param string $path
-     * @return array
-     */
-    public function getChildren($path) {
-
-        $node = $this->getNodeForPath($path);
-        $children = $node->getChildren();
-        foreach($children as $child) {
-
-            $this->cache[trim($path,'/') . '/' . $child->getName()] = $child;
-
-        }
-        return $children;
-
-    }
-
-    /**
-     * This method is called with every tree update
-     *
-     * Examples of tree updates are:
-     *   * node deletions
-     *   * node creations
-     *   * copy
-     *   * move
-     *   * renaming nodes
-     *
-     * If Tree classes implement a form of caching, this will allow
-     * them to make sure caches will be expired.
-     *
-     * If a path is passed, it is assumed that the entire subtree is dirty
-     *
-     * @param string $path
-     * @return void
-     */
-    public function markDirty($path) {
-
-        // We don't care enough about sub-paths
-        // flushing the entire cache
-        $path = trim($path,'/');
-        foreach($this->cache as $nodePath=>$node) {
-            if ($nodePath == $path || strpos($nodePath,$path.'/')===0)
-                unset($this->cache[$nodePath]);
-
-        }
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/PartialUpdate/IFile.php b/vendor/sabre/dav/lib/Sabre/DAV/PartialUpdate/IFile.php
deleted file mode 100644
index 9cfb47377..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/PartialUpdate/IFile.php
+++ /dev/null
@@ -1,39 +0,0 @@
-<?php
-
-namespace Sabre\DAV\PartialUpdate;
-
-use Sabre\DAV;
-
-/**
- * This interface is deprecated. Use IPatchSupport instead.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Jean-Tiare LE BIGOT (http://www.jtlebi.fr/)
- * @license http://sabre.io/license/ Modified BSD License
- * @deprecated
- */
-interface IFile extends DAV\IFile {
-
-    /**
-     * Updates the data at a given offset
-     *
-     * The data argument is a readable stream resource.
-     * The offset argument is an integer describing the offset. Contrary to
-     * what's sent in the request, the offset here is a 0-based index.
-     *
-     * After a successful put operation, you may choose to return an ETag. The
-     * etag must always be surrounded by double-quotes. These quotes must
-     * appear in the actual string you're returning.
-     *
-     * Clients may use the ETag from a PUT request to later on make sure that
-     * when they update the file, the contents haven't changed in the mean
-     * time.
-     *
-     * @param resource $data
-     * @param integer $offset
-     * @return string|null
-     */
-    function putRange($data, $offset);
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property.php b/vendor/sabre/dav/lib/Sabre/DAV/Property.php
deleted file mode 100644
index d0c265907..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property.php
+++ /dev/null
@@ -1,31 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-
-/**
- * Abstract property class
- *
- * Extend this class to create custom complex properties
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-abstract class Property implements PropertyInterface {
-
-    /**
-     * Unserializes the property.
-     *
-     * This static method should return a an instance of this object.
-     *
-     * @param \DOMElement $prop
-     * @return DAV\IProperty
-     */
-    static function unserialize(\DOMElement $prop) {
-
-        throw new Exception('Unserialize has not been implemented for this class');
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/GetLastModified.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/GetLastModified.php
deleted file mode 100644
index 987e3fc02..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/GetLastModified.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-use Sabre\DAV;
-use Sabre\HTTP;
-
-/**
- * This property represents the {DAV:}getlastmodified property.
- *
- * Although this is normally a simple property, windows requires us to add
- * some new attributes.
- *
- * This class uses unix timestamps internally, and converts them to RFC 1123 times for
- * serialization
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class GetLastModified extends DAV\Property {
-
-    /**
-     * time
-     *
-     * @var int
-     */
-    public $time;
-
-    /**
-     * __construct
-     *
-     * @param int|DateTime $time
-     */
-    public function __construct($time) {
-
-        if ($time instanceof \DateTime) {
-            $this->time = $time;
-        } elseif (is_int($time) || ctype_digit($time)) {
-            $this->time = new \DateTime('@' . $time);
-        } else {
-            $this->time = new \DateTime($time);
-        }
-
-        // Setting timezone to UTC
-        $this->time->setTimezone(new \DateTimeZone('UTC'));
-
-    }
-
-    /**
-     * serialize
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $prop
-     * @return void
-     */
-    public function serialize(DAV\Server $server, \DOMElement $prop) {
-
-        $doc = $prop->ownerDocument;
-        //$prop->setAttribute('xmlns:b','urn:uuid:c2f41010-65b3-11d1-a29f-00aa00c14882/');
-        //$prop->setAttribute('b:dt','dateTime.rfc1123');
-        $prop->nodeValue = HTTP\Util::toHTTPDate($this->time);
-
-    }
-
-    /**
-     * getTime
-     *
-     * @return \DateTime
-     */
-    public function getTime() {
-
-        return $this->time;
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/Href.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/Href.php
deleted file mode 100644
index f0c162706..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/Href.php
+++ /dev/null
@@ -1,99 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-use Sabre\DAV;
-
-/**
- * Href property
- *
- * The href property represents a url within a {DAV:}href element.
- * This is used by many WebDAV extensions, but not really within the WebDAV core spec
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Href extends DAV\Property implements IHref {
-
-    /**
-     * href
-     *
-     * @var string
-     */
-    private $href;
-
-    /**
-     * Automatically prefix the url with the server base directory
-     *
-     * @var bool
-     */
-    private $autoPrefix = true;
-
-    /**
-     * __construct
-     *
-     * @param string $href
-     * @param bool $autoPrefix
-     */
-    public function __construct($href, $autoPrefix = true) {
-
-        $this->href = $href;
-        $this->autoPrefix = $autoPrefix;
-
-    }
-
-    /**
-     * Returns the uri
-     *
-     * @return string
-     */
-    public function getHref() {
-
-        return $this->href;
-
-    }
-
-    /**
-     * Serializes this property.
-     *
-     * It will additionally prepend the href property with the server's base uri.
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $dom
-     * @return void
-     */
-    public function serialize(DAV\Server $server, \DOMElement $dom) {
-
-        $prefix = $server->xmlNamespaces['DAV:'];
-        $elem = $dom->ownerDocument->createElement($prefix . ':href');
-
-        if ($this->autoPrefix) {
-            $value = $server->getBaseUri() . DAV\URLUtil::encodePath($this->href);
-        } else {
-            $value = $this->href;
-        }
-        $elem->appendChild($dom->ownerDocument->createTextNode($value));
-
-        $dom->appendChild($elem);
-
-    }
-
-    /**
-     * Unserializes this property from a DOM Element
-     *
-     * This method returns an instance of this class.
-     * It will only decode {DAV:}href values. For non-compatible elements null will be returned.
-     *
-     * @param \DOMElement $dom
-     * @return DAV\Property\Href
-     */
-    static function unserialize(\DOMElement $dom) {
-
-        if ($dom->firstChild && DAV\XMLUtil::toClarkNotation($dom->firstChild)==='{DAV:}href') {
-            return new self($dom->firstChild->textContent,false);
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/HrefList.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/HrefList.php
deleted file mode 100644
index a5bad4ace..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/HrefList.php
+++ /dev/null
@@ -1,105 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-use Sabre\DAV;
-
-/**
- * HrefList property
- *
- * This property contains multiple {DAV:}href elements, each containing a url.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class HrefList extends DAV\Property {
-
-    /**
-     * hrefs
-     *
-     * @var array
-     */
-    private $hrefs;
-
-    /**
-     * Automatically prefix the url with the server base directory
-     *
-     * @var bool
-     */
-    private $autoPrefix = true;
-
-    /**
-     * __construct
-     *
-     * @param array $hrefs
-     * @param bool $autoPrefix
-     */
-    public function __construct(array $hrefs, $autoPrefix = true) {
-
-        $this->hrefs = $hrefs;
-        $this->autoPrefix = $autoPrefix;
-
-    }
-
-    /**
-     * Returns the uris
-     *
-     * @return array
-     */
-    public function getHrefs() {
-
-        return $this->hrefs;
-
-    }
-
-    /**
-     * Serializes this property.
-     *
-     * It will additionally prepend the href property with the server's base uri.
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $dom
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $dom) {
-
-        $prefix = $server->xmlNamespaces['DAV:'];
-
-        foreach($this->hrefs as $href) {
-
-            $elem = $dom->ownerDocument->createElement($prefix . ':href');
-            if ($this->autoPrefix) {
-                $value = $server->getBaseUri() . DAV\URLUtil::encodePath($href);
-            } else {
-                $value = $href;
-            }
-            $elem->appendChild($dom->ownerDocument->createTextNode($value));
-
-            $dom->appendChild($elem);
-        }
-
-    }
-
-    /**
-     * Unserializes this property from a DOM Element
-     *
-     * This method returns an instance of this class.
-     * It will only decode {DAV:}href values.
-     *
-     * @param \DOMElement $dom
-     * @return DAV\Property\HrefList
-     */
-    static function unserialize(\DOMElement $dom) {
-
-        $hrefs = array();
-        foreach($dom->childNodes as $child) {
-            if (DAV\XMLUtil::toClarkNotation($child)==='{DAV:}href') {
-                $hrefs[] = $child->textContent;
-            }
-        }
-        return new self($hrefs, false);
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/IHref.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/IHref.php
deleted file mode 100644
index 268ab8d51..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/IHref.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-/**
- * IHref interface
- *
- * Any property implementing this interface can expose a related url.
- * This is used by certain subsystems to aquire more information about for example
- * the owner of a file
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-interface IHref {
-
-    /**
-     * getHref
-     *
-     * @return string
-     */
-    function getHref();
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/LockDiscovery.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/LockDiscovery.php
deleted file mode 100644
index 6b47935af..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/LockDiscovery.php
+++ /dev/null
@@ -1,104 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-use Sabre\DAV;
-
-/**
- * Represents {DAV:}lockdiscovery property
- *
- * This property contains all the open locks on a given resource
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class LockDiscovery extends DAV\Property {
-
-    /**
-     * locks
-     *
-     * @var array
-     */
-    public $locks;
-
-    /**
-     * Should we show the locktoken as well?
-     *
-     * @var bool
-     */
-    public $revealLockToken;
-
-    /**
-     * Hides the {DAV:}lockroot element from the response.
-     *
-     * It was reported that showing the lockroot in the response can break
-     * Office 2000 compatibility.
-     */
-    static public $hideLockRoot = false;
-
-    /**
-     * __construct
-     *
-     * @param array $locks
-     * @param bool $revealLockToken
-     */
-    public function __construct($locks, $revealLockToken = false) {
-
-        $this->locks = $locks;
-        $this->revealLockToken = $revealLockToken;
-
-    }
-
-    /**
-     * serialize
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $prop
-     * @return void
-     */
-    public function serialize(DAV\Server $server, \DOMElement $prop) {
-
-        $doc = $prop->ownerDocument;
-
-        foreach($this->locks as $lock) {
-
-            $activeLock = $doc->createElementNS('DAV:','d:activelock');
-            $prop->appendChild($activeLock);
-
-            $lockScope = $doc->createElementNS('DAV:','d:lockscope');
-            $activeLock->appendChild($lockScope);
-
-            $lockScope->appendChild($doc->createElementNS('DAV:','d:' . ($lock->scope==DAV\Locks\LockInfo::EXCLUSIVE?'exclusive':'shared')));
-
-            $lockType = $doc->createElementNS('DAV:','d:locktype');
-            $activeLock->appendChild($lockType);
-
-            $lockType->appendChild($doc->createElementNS('DAV:','d:write'));
-
-            /* {DAV:}lockroot */
-            if (!self::$hideLockRoot) {
-                $lockRoot = $doc->createElementNS('DAV:','d:lockroot');
-                $activeLock->appendChild($lockRoot);
-                $href = $doc->createElementNS('DAV:','d:href');
-                $href->appendChild($doc->createTextNode($server->getBaseUri() . $lock->uri));
-                $lockRoot->appendChild($href);
-            }
-
-            $activeLock->appendChild($doc->createElementNS('DAV:','d:depth',($lock->depth == DAV\Server::DEPTH_INFINITY?'infinity':$lock->depth)));
-            $activeLock->appendChild($doc->createElementNS('DAV:','d:timeout','Second-' . $lock->timeout));
-
-            if ($this->revealLockToken) {
-                $lockToken = $doc->createElementNS('DAV:','d:locktoken');
-                $activeLock->appendChild($lockToken);
-                $lockToken->appendChild($doc->createElementNS('DAV:','d:href','opaquelocktoken:' . $lock->token));
-            }
-
-            $activeLock->appendChild($doc->createElementNS('DAV:','d:owner',$lock->owner));
-
-        }
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/ResourceType.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/ResourceType.php
deleted file mode 100644
index 68134f3f9..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/ResourceType.php
+++ /dev/null
@@ -1,127 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-use Sabre\DAV;
-
-/**
- * This class represents the {DAV:}resourcetype property
- *
- * Normally for files this is empty, and for collection {DAV:}collection.
- * However, other specs define different values for this.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class ResourceType extends DAV\Property {
-
-    /**
-     * resourceType
-     *
-     * @var array
-     */
-    public $resourceType = array();
-
-    /**
-     * __construct
-     *
-     * @param mixed $resourceType
-     */
-    public function __construct($resourceType = array()) {
-
-        if ($resourceType === DAV\Server::NODE_FILE)
-            $this->resourceType = array();
-        elseif ($resourceType === DAV\Server::NODE_DIRECTORY)
-            $this->resourceType = array('{DAV:}collection');
-        elseif (is_array($resourceType))
-            $this->resourceType = $resourceType;
-        else
-            $this->resourceType = array($resourceType);
-
-    }
-
-    /**
-     * serialize
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $prop
-     * @return void
-     */
-    public function serialize(DAV\Server $server, \DOMElement $prop) {
-
-        $propName = null;
-        $rt = $this->resourceType;
-
-        foreach($rt as $resourceType) {
-            if (preg_match('/^{([^}]*)}(.*)$/',$resourceType,$propName)) {
-
-                if (isset($server->xmlNamespaces[$propName[1]])) {
-                    $prop->appendChild($prop->ownerDocument->createElement($server->xmlNamespaces[$propName[1]] . ':' . $propName[2]));
-                } else {
-                    $prop->appendChild($prop->ownerDocument->createElementNS($propName[1],'custom:' . $propName[2]));
-                }
-
-            }
-        }
-
-    }
-
-    /**
-     * Returns the values in clark-notation
-     *
-     * For example array('{DAV:}collection')
-     *
-     * @return array
-     */
-    public function getValue() {
-
-        return $this->resourceType;
-
-    }
-
-    /**
-     * Checks if the principal contains a certain value
-     *
-     * @param string $type
-     * @return bool
-     */
-    public function is($type) {
-
-        return in_array($type, $this->resourceType);
-
-    }
-
-    /**
-     * Adds a resourcetype value to this property
-     *
-     * @param string $type
-     * @return void
-     */
-    public function add($type) {
-
-        $this->resourceType[] = $type;
-        $this->resourceType = array_unique($this->resourceType);
-
-    }
-
-    /**
-     * Unserializes a DOM element into a ResourceType property.
-     *
-     * @param \DOMElement $dom
-     * @return DAV\Property\ResourceType
-     */
-    static public function unserialize(\DOMElement $dom) {
-
-        $value = array();
-        foreach($dom->childNodes as $child) {
-
-            $value[] = DAV\XMLUtil::toClarkNotation($child);
-
-        }
-
-        return new self($value);
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/Response.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/Response.php
deleted file mode 100644
index 370abc26b..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/Response.php
+++ /dev/null
@@ -1,157 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-use Sabre\DAV;
-
-/**
- * Response property
- *
- * This class represents the {DAV:}response XML element.
- * This is used by the Server class to encode individual items within a multistatus
- * response.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Response extends DAV\Property implements IHref {
-
-    /**
-     * Url for the response
-     *
-     * @var string
-     */
-    private $href;
-
-    /**
-     * Propertylist, ordered by HTTP status code
-     *
-     * @var array
-     */
-    private $responseProperties;
-
-    /**
-     * The responseProperties argument is a list of properties
-     * within an array with keys representing HTTP status codes
-     *
-     * @param string $href
-     * @param array $responseProperties
-     */
-    public function __construct($href, array $responseProperties) {
-
-        $this->href = $href;
-        $this->responseProperties = $responseProperties;
-
-    }
-
-    /**
-     * Returns the url
-     *
-     * @return string
-     */
-    public function getHref() {
-
-        return $this->href;
-
-    }
-
-    /**
-     * Returns the property list
-     *
-     * @return array
-     */
-    public function getResponseProperties() {
-
-        return $this->responseProperties;
-
-    }
-
-    /**
-     * serialize
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $dom
-     * @return void
-     */
-    public function serialize(DAV\Server $server, \DOMElement $dom) {
-
-        $document = $dom->ownerDocument;
-        $properties = $this->responseProperties;
-
-        $xresponse = $document->createElement('d:response');
-        $dom->appendChild($xresponse);
-
-        $uri = DAV\URLUtil::encodePath($this->href);
-
-        // Adding the baseurl to the beginning of the url
-        $uri = $server->getBaseUri() . $uri;
-
-        $xresponse->appendChild($document->createElement('d:href',$uri));
-
-        // The properties variable is an array containing properties, grouped by
-        // HTTP status
-        foreach($properties as $httpStatus=>$propertyGroup) {
-
-            // The 'href' is also in this array, and it's special cased.
-            // We will ignore it
-            if ($httpStatus=='href') continue;
-
-            // If there are no properties in this group, we can also just carry on
-            if (!count($propertyGroup)) continue;
-
-            $xpropstat = $document->createElement('d:propstat');
-            $xresponse->appendChild($xpropstat);
-
-            $xprop = $document->createElement('d:prop');
-            $xpropstat->appendChild($xprop);
-
-            $nsList = $server->xmlNamespaces;
-
-            foreach($propertyGroup as $propertyName=>$propertyValue) {
-
-                $propName = null;
-                preg_match('/^{([^}]*)}(.*)$/',$propertyName,$propName);
-
-                // special case for empty namespaces
-                if ($propName[1]=='') {
-
-                    $currentProperty = $document->createElement($propName[2]);
-                    $xprop->appendChild($currentProperty);
-                    $currentProperty->setAttribute('xmlns','');
-
-                } else {
-
-                    if (!isset($nsList[$propName[1]])) {
-                        $nsList[$propName[1]] = 'x' . count($nsList);
-                    }
-
-                    // If the namespace was defined in the top-level xml namespaces, it means
-                    // there was already a namespace declaration, and we don't have to worry about it.
-                    if (isset($server->xmlNamespaces[$propName[1]])) {
-                        $currentProperty = $document->createElement($nsList[$propName[1]] . ':' . $propName[2]);
-                    } else {
-                        $currentProperty = $document->createElementNS($propName[1],$nsList[$propName[1]].':' . $propName[2]);
-                    }
-                    $xprop->appendChild($currentProperty);
-
-                }
-
-                if (is_scalar($propertyValue)) {
-                    $text = $document->createTextNode($propertyValue);
-                    $currentProperty->appendChild($text);
-                } elseif ($propertyValue instanceof DAV\PropertyInterface) {
-                    $propertyValue->serialize($server,$currentProperty);
-                } elseif (!is_null($propertyValue)) {
-                    throw new DAV\Exception('Unknown property value type: ' . gettype($propertyValue) . ' for property: ' . $propertyName);
-                }
-
-            }
-
-            $xpropstat->appendChild($document->createElement('d:status',$server->httpResponse->getStatusMessage($httpStatus)));
-
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/ResponseList.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/ResponseList.php
deleted file mode 100644
index 9db6cbbf5..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/ResponseList.php
+++ /dev/null
@@ -1,59 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-use Sabre\DAV;
-
-/**
- * ResponseList property
- *
- * This class represents multiple {DAV:}response XML elements.
- * This is used by the Server class to encode items within a multistatus
- * response.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class ResponseList extends DAV\Property {
-
-    /**
-     * Response objects.
-     *
-     * @var array
-     */
-    private $responses;
-
-    /**
-     * The only valid argument is a list of Sabre\DAV\Property\Response
-     * objects.
-     *
-     * @param array $responses;
-     */
-    public function __construct($responses) {
-
-        foreach($responses as $response) {
-            if (!($response instanceof Response)) {
-                throw new \InvalidArgumentException('You must pass an array of Sabre\DAV\Property\Response objects');
-            }
-        }
-        $this->responses = $responses;
-
-    }
-
-    /**
-     * serialize
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $dom
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $dom) {
-
-        foreach($this->responses as $response) {
-            $response->serialize($server, $dom);
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/SupportedLock.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/SupportedLock.php
deleted file mode 100644
index 035c2f330..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/SupportedLock.php
+++ /dev/null
@@ -1,78 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-use Sabre\DAV;
-
-/**
- * This class represents the {DAV:}supportedlock property
- *
- * This property contains information about what kind of locks
- * this server supports.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class SupportedLock extends DAV\Property {
-
-    /**
-     * supportsLocks
-     *
-     * @var mixed
-     */
-    public $supportsLocks = false;
-
-    /**
-     * __construct
-     *
-     * @param mixed $supportsLocks
-     */
-    public function __construct($supportsLocks) {
-
-        $this->supportsLocks = $supportsLocks;
-
-    }
-
-    /**
-     * serialize
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $prop
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $prop) {
-
-        $doc = $prop->ownerDocument;
-
-        if (!$this->supportsLocks) return null;
-
-        $lockEntry1 = $doc->createElement('d:lockentry');
-        $lockEntry2 = $doc->createElement('d:lockentry');
-
-        $prop->appendChild($lockEntry1);
-        $prop->appendChild($lockEntry2);
-
-        $lockScope1 = $doc->createElement('d:lockscope');
-        $lockScope2 = $doc->createElement('d:lockscope');
-        $lockType1 = $doc->createElement('d:locktype');
-        $lockType2 = $doc->createElement('d:locktype');
-
-        $lockEntry1->appendChild($lockScope1);
-        $lockEntry1->appendChild($lockType1);
-        $lockEntry2->appendChild($lockScope2);
-        $lockEntry2->appendChild($lockType2);
-
-        $lockScope1->appendChild($doc->createElement('d:exclusive'));
-        $lockScope2->appendChild($doc->createElement('d:shared'));
-
-        $lockType1->appendChild($doc->createElement('d:write'));
-        $lockType2->appendChild($doc->createElement('d:write'));
-
-        //$frag->appendXML('<d:lockentry><d:lockscope><d:exclusive /></d:lockscope><d:locktype><d:write /></d:locktype></d:lockentry>');
-        //$frag->appendXML('<d:lockentry><d:lockscope><d:shared /></d:lockscope><d:locktype><d:write /></d:locktype></d:lockentry>');
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Property/SupportedReportSet.php b/vendor/sabre/dav/lib/Sabre/DAV/Property/SupportedReportSet.php
deleted file mode 100644
index a8a90bb18..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Property/SupportedReportSet.php
+++ /dev/null
@@ -1,111 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Property;
-
-use Sabre\DAV;
-
-/**
- * supported-report-set property.
- *
- * This property is defined in RFC3253, but since it's
- * so common in other webdav-related specs, it is part of the core server.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class SupportedReportSet extends DAV\Property {
-
-    /**
-     * List of reports
-     *
-     * @var array
-     */
-    protected $reports = array();
-
-    /**
-     * Creates the property
-     *
-     * Any reports passed in the constructor
-     * should be valid report-types in clark-notation.
-     *
-     * Either a string or an array of strings must be passed.
-     *
-     * @param mixed $reports
-     */
-    public function __construct($reports = null) {
-
-        if (!is_null($reports))
-            $this->addReport($reports);
-
-    }
-
-    /**
-     * Adds a report to this property
-     *
-     * The report must be a string in clark-notation.
-     * Multiple reports can be specified as an array.
-     *
-     * @param mixed $report
-     * @return void
-     */
-    public function addReport($report) {
-
-        if (!is_array($report)) $report = array($report);
-
-        foreach($report as $r) {
-
-            if (!preg_match('/^{([^}]*)}(.*)$/',$r))
-                throw new DAV\Exception('Reportname must be in clark-notation');
-
-            $this->reports[] = $r;
-
-        }
-
-    }
-
-    /**
-     * Returns the list of supported reports
-     *
-     * @return array
-     */
-    public function getValue() {
-
-        return $this->reports;
-
-    }
-
-    /**
-     * Serializes the node
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $prop
-     * @return void
-     */
-    public function serialize(DAV\Server $server, \DOMElement $prop) {
-
-        foreach($this->reports as $reportName) {
-
-            $supportedReport = $prop->ownerDocument->createElement('d:supported-report');
-            $prop->appendChild($supportedReport);
-
-            $report = $prop->ownerDocument->createElement('d:report');
-            $supportedReport->appendChild($report);
-
-            preg_match('/^{([^}]*)}(.*)$/',$reportName,$matches);
-
-            list(, $namespace, $element) = $matches;
-
-            $prefix = isset($server->xmlNamespaces[$namespace])?$server->xmlNamespaces[$namespace]:null;
-
-            if ($prefix) {
-                $report->appendChild($prop->ownerDocument->createElement($prefix . ':' . $element));
-            } else {
-                $report->appendChild($prop->ownerDocument->createElementNS($namespace, 'x:' . $element));
-            }
-
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/PropertyInterface.php b/vendor/sabre/dav/lib/Sabre/DAV/PropertyInterface.php
deleted file mode 100644
index 2fb0d7db6..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/PropertyInterface.php
+++ /dev/null
@@ -1,21 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-
-/**
- * PropertyInterface
- *
- * Implement this interface to create new complex properties
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-interface PropertyInterface {
-
-    public function serialize(Server $server, \DOMElement $prop);
-
-    static function unserialize(\DOMElement $prop);
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Server.php b/vendor/sabre/dav/lib/Sabre/DAV/Server.php
deleted file mode 100644
index e0a68ab50..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Server.php
+++ /dev/null
@@ -1,2178 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-use Sabre\HTTP;
-
-/**
- * Main DAV server class
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Server {
-
-    /**
-     * Infinity is used for some request supporting the HTTP Depth header and indicates that the operation should traverse the entire tree
-     */
-    const DEPTH_INFINITY = -1;
-
-    /**
-     * Nodes that are files, should have this as the type property
-     */
-    const NODE_FILE = 1;
-
-    /**
-     * Nodes that are directories, should use this value as the type property
-     */
-    const NODE_DIRECTORY = 2;
-
-    /**
-     * XML namespace for all SabreDAV related elements
-     */
-    const NS_SABREDAV = 'http://sabredav.org/ns';
-
-    /**
-     * The tree object
-     *
-     * @var Sabre\DAV\Tree
-     */
-    public $tree;
-
-    /**
-     * The base uri
-     *
-     * @var string
-     */
-    protected $baseUri = null;
-
-    /**
-     * httpResponse
-     *
-     * @var Sabre\HTTP\Response
-     */
-    public $httpResponse;
-
-    /**
-     * httpRequest
-     *
-     * @var Sabre\HTTP\Request
-     */
-    public $httpRequest;
-
-    /**
-     * The list of plugins
-     *
-     * @var array
-     */
-    protected $plugins = array();
-
-    /**
-     * This array contains a list of callbacks we should call when certain events are triggered
-     *
-     * @var array
-     */
-    protected $eventSubscriptions = array();
-
-    /**
-     * This is a default list of namespaces.
-     *
-     * If you are defining your own custom namespace, add it here to reduce
-     * bandwidth and improve legibility of xml bodies.
-     *
-     * @var array
-     */
-    public $xmlNamespaces = array(
-        'DAV:' => 'd',
-        'http://sabredav.org/ns' => 's',
-    );
-
-    /**
-     * The propertymap can be used to map properties from
-     * requests to property classes.
-     *
-     * @var array
-     */
-    public $propertyMap = array(
-        '{DAV:}resourcetype' => 'Sabre\\DAV\\Property\\ResourceType',
-    );
-
-    public $protectedProperties = array(
-        // RFC4918
-        '{DAV:}getcontentlength',
-        '{DAV:}getetag',
-        '{DAV:}getlastmodified',
-        '{DAV:}lockdiscovery',
-        '{DAV:}supportedlock',
-
-        // RFC4331
-        '{DAV:}quota-available-bytes',
-        '{DAV:}quota-used-bytes',
-
-        // RFC3744
-        '{DAV:}supported-privilege-set',
-        '{DAV:}current-user-privilege-set',
-        '{DAV:}acl',
-        '{DAV:}acl-restrictions',
-        '{DAV:}inherited-acl-set',
-
-    );
-
-    /**
-     * This is a flag that allow or not showing file, line and code
-     * of the exception in the returned XML
-     *
-     * @var bool
-     */
-    public $debugExceptions = false;
-
-    /**
-     * This property allows you to automatically add the 'resourcetype' value
-     * based on a node's classname or interface.
-     *
-     * The preset ensures that {DAV:}collection is automaticlly added for nodes
-     * implementing Sabre\DAV\ICollection.
-     *
-     * @var array
-     */
-    public $resourceTypeMapping = array(
-        'Sabre\\DAV\\ICollection' => '{DAV:}collection',
-    );
-
-    /**
-     * If this setting is turned off, SabreDAV's version number will be hidden
-     * from various places.
-     *
-     * Some people feel this is a good security measure.
-     *
-     * @var bool
-     */
-    static public $exposeVersion = true;
-
-    /**
-     * Sets up the server
-     *
-     * If a Sabre\DAV\Tree object is passed as an argument, it will
-     * use it as the directory tree. If a Sabre\DAV\INode is passed, it
-     * will create a Sabre\DAV\ObjectTree and use the node as the root.
-     *
-     * If nothing is passed, a Sabre\DAV\SimpleCollection is created in
-     * a Sabre\DAV\ObjectTree.
-     *
-     * If an array is passed, we automatically create a root node, and use
-     * the nodes in the array as top-level children.
-     *
-     * @param Tree|INode|array|null $treeOrNode The tree object
-     */
-    public function __construct($treeOrNode = null) {
-
-        if ($treeOrNode instanceof Tree) {
-            $this->tree = $treeOrNode;
-        } elseif ($treeOrNode instanceof INode) {
-            $this->tree = new ObjectTree($treeOrNode);
-        } elseif (is_array($treeOrNode)) {
-
-            // If it's an array, a list of nodes was passed, and we need to
-            // create the root node.
-            foreach($treeOrNode as $node) {
-                if (!($node instanceof INode)) {
-                    throw new Exception('Invalid argument passed to constructor. If you\'re passing an array, all the values must implement Sabre\\DAV\\INode');
-                }
-            }
-
-            $root = new SimpleCollection('root', $treeOrNode);
-            $this->tree = new ObjectTree($root);
-
-        } elseif (is_null($treeOrNode)) {
-            $root = new SimpleCollection('root');
-            $this->tree = new ObjectTree($root);
-        } else {
-            throw new Exception('Invalid argument passed to constructor. Argument must either be an instance of Sabre\\DAV\\Tree, Sabre\\DAV\\INode, an array or null');
-        }
-        $this->httpResponse = new HTTP\Response();
-        $this->httpRequest = new HTTP\Request();
-
-    }
-
-    /**
-     * Starts the DAV Server
-     *
-     * @return void
-     */
-    public function exec() {
-
-        try {
-
-            // If nginx (pre-1.2) is used as a proxy server, and SabreDAV as an
-            // origin, we must make sure we send back HTTP/1.0 if this was
-            // requested.
-            // This is mainly because nginx doesn't support Chunked Transfer
-            // Encoding, and this forces the webserver SabreDAV is running on,
-            // to buffer entire responses to calculate Content-Length.
-            $this->httpResponse->defaultHttpVersion = $this->httpRequest->getHTTPVersion();
-
-            $this->invokeMethod($this->httpRequest->getMethod(), $this->getRequestUri());
-
-        } catch (Exception $e) {
-
-            try {
-                $this->broadcastEvent('exception', array($e));
-            } catch (Exception $ignore) {
-            }
-            $DOM = new \DOMDocument('1.0','utf-8');
-            $DOM->formatOutput = true;
-
-            $error = $DOM->createElementNS('DAV:','d:error');
-            $error->setAttribute('xmlns:s',self::NS_SABREDAV);
-            $DOM->appendChild($error);
-
-            $h = function($v) {
-
-                return htmlspecialchars($v, ENT_NOQUOTES, 'UTF-8');
-
-            };
-
-            $error->appendChild($DOM->createElement('s:exception',$h(get_class($e))));
-            $error->appendChild($DOM->createElement('s:message',$h($e->getMessage())));
-            if ($this->debugExceptions) {
-                $error->appendChild($DOM->createElement('s:file',$h($e->getFile())));
-                $error->appendChild($DOM->createElement('s:line',$h($e->getLine())));
-                $error->appendChild($DOM->createElement('s:code',$h($e->getCode())));
-                $error->appendChild($DOM->createElement('s:stacktrace',$h($e->getTraceAsString())));
-
-            }
-            if (self::$exposeVersion) {
-                $error->appendChild($DOM->createElement('s:sabredav-version',$h(Version::VERSION)));
-            }
-
-            if($e instanceof Exception) {
-
-                $httpCode = $e->getHTTPCode();
-                $e->serialize($this,$error);
-                $headers = $e->getHTTPHeaders($this);
-
-            } else {
-
-                $httpCode = 500;
-                $headers = array();
-
-            }
-            $headers['Content-Type'] = 'application/xml; charset=utf-8';
-
-            $this->httpResponse->sendStatus($httpCode);
-            $this->httpResponse->setHeaders($headers);
-            $this->httpResponse->sendBody($DOM->saveXML());
-
-        }
-
-    }
-
-    /**
-     * Sets the base server uri
-     *
-     * @param string $uri
-     * @return void
-     */
-    public function setBaseUri($uri) {
-
-        // If the baseUri does not end with a slash, we must add it
-        if ($uri[strlen($uri)-1]!=='/')
-            $uri.='/';
-
-        $this->baseUri = $uri;
-
-    }
-
-    /**
-     * Returns the base responding uri
-     *
-     * @return string
-     */
-    public function getBaseUri() {
-
-        if (is_null($this->baseUri)) $this->baseUri = $this->guessBaseUri();
-        return $this->baseUri;
-
-    }
-
-    /**
-     * This method attempts to detect the base uri.
-     * Only the PATH_INFO variable is considered.
-     *
-     * If this variable is not set, the root (/) is assumed.
-     *
-     * @return string
-     */
-    public function guessBaseUri() {
-
-        $pathInfo = $this->httpRequest->getRawServerValue('PATH_INFO');
-        $uri = $this->httpRequest->getRawServerValue('REQUEST_URI');
-
-        // If PATH_INFO is found, we can assume it's accurate.
-        if (!empty($pathInfo)) {
-
-            // We need to make sure we ignore the QUERY_STRING part
-            if ($pos = strpos($uri,'?'))
-                $uri = substr($uri,0,$pos);
-
-            // PATH_INFO is only set for urls, such as: /example.php/path
-            // in that case PATH_INFO contains '/path'.
-            // Note that REQUEST_URI is percent encoded, while PATH_INFO is
-            // not, Therefore they are only comparable if we first decode
-            // REQUEST_INFO as well.
-            $decodedUri = URLUtil::decodePath($uri);
-
-            // A simple sanity check:
-            if(substr($decodedUri,strlen($decodedUri)-strlen($pathInfo))===$pathInfo) {
-                $baseUri = substr($decodedUri,0,strlen($decodedUri)-strlen($pathInfo));
-                return rtrim($baseUri,'/') . '/';
-            }
-
-            throw new Exception('The REQUEST_URI ('. $uri . ') did not end with the contents of PATH_INFO (' . $pathInfo . '). This server might be misconfigured.');
-
-        }
-
-        // The last fallback is that we're just going to assume the server root.
-        return '/';
-
-    }
-
-    /**
-     * Adds a plugin to the server
-     *
-     * For more information, console the documentation of Sabre\DAV\ServerPlugin
-     *
-     * @param ServerPlugin $plugin
-     * @return void
-     */
-    public function addPlugin(ServerPlugin $plugin) {
-
-        $this->plugins[$plugin->getPluginName()] = $plugin;
-        $plugin->initialize($this);
-
-    }
-
-    /**
-     * Returns an initialized plugin by it's name.
-     *
-     * This function returns null if the plugin was not found.
-     *
-     * @param string $name
-     * @return ServerPlugin
-     */
-    public function getPlugin($name) {
-
-        if (isset($this->plugins[$name]))
-            return $this->plugins[$name];
-
-        // This is a fallback and deprecated.
-        foreach($this->plugins as $plugin) {
-            if (get_class($plugin)===$name) return $plugin;
-        }
-
-        return null;
-
-    }
-
-    /**
-     * Returns all plugins
-     *
-     * @return array
-     */
-    public function getPlugins() {
-
-        return $this->plugins;
-
-    }
-
-
-    /**
-     * Subscribe to an event.
-     *
-     * When the event is triggered, we'll call all the specified callbacks.
-     * It is possible to control the order of the callbacks through the
-     * priority argument.
-     *
-     * This is for example used to make sure that the authentication plugin
-     * is triggered before anything else. If it's not needed to change this
-     * number, it is recommended to ommit.
-     *
-     * @param string $event
-     * @param callback $callback
-     * @param int $priority
-     * @return void
-     */
-    public function subscribeEvent($event, $callback, $priority = 100) {
-
-        if (!isset($this->eventSubscriptions[$event])) {
-            $this->eventSubscriptions[$event] = array();
-        }
-        while(isset($this->eventSubscriptions[$event][$priority])) $priority++;
-        $this->eventSubscriptions[$event][$priority] = $callback;
-        ksort($this->eventSubscriptions[$event]);
-
-    }
-
-    /**
-     * Broadcasts an event
-     *
-     * This method will call all subscribers. If one of the subscribers returns false, the process stops.
-     *
-     * The arguments parameter will be sent to all subscribers
-     *
-     * @param string $eventName
-     * @param array $arguments
-     * @return bool
-     */
-    public function broadcastEvent($eventName,$arguments = array()) {
-
-        if (isset($this->eventSubscriptions[$eventName])) {
-
-            foreach($this->eventSubscriptions[$eventName] as $subscriber) {
-
-                $result = call_user_func_array($subscriber,$arguments);
-                if ($result===false) return false;
-
-            }
-
-        }
-
-        return true;
-
-    }
-
-    /**
-     * Handles a http request, and execute a method based on its name
-     *
-     * @param string $method
-     * @param string $uri
-     * @return void
-     */
-    public function invokeMethod($method, $uri) {
-
-        $method = strtoupper($method);
-
-        if (!$this->broadcastEvent('beforeMethod',array($method, $uri))) return;
-
-        // Make sure this is a HTTP method we support
-        $internalMethods = array(
-            'OPTIONS',
-            'GET',
-            'HEAD',
-            'DELETE',
-            'PROPFIND',
-            'MKCOL',
-            'PUT',
-            'PROPPATCH',
-            'COPY',
-            'MOVE',
-            'REPORT'
-        );
-
-        if (in_array($method,$internalMethods)) {
-
-            call_user_func(array($this,'http' . $method), $uri);
-
-        } else {
-
-            if ($this->broadcastEvent('unknownMethod',array($method, $uri))) {
-                // Unsupported method
-                throw new Exception\NotImplemented('There was no handler found for this "' . $method . '" method');
-            }
-
-        }
-
-    }
-
-    // {{{ HTTP Method implementations
-
-    /**
-     * HTTP OPTIONS
-     *
-     * @param string $uri
-     * @return void
-     */
-    protected function httpOptions($uri) {
-
-        $methods = $this->getAllowedMethods($uri);
-
-        $this->httpResponse->setHeader('Allow',strtoupper(implode(', ',$methods)));
-        $features = array('1','3', 'extended-mkcol');
-
-        foreach($this->plugins as $plugin) $features = array_merge($features,$plugin->getFeatures());
-
-        $this->httpResponse->setHeader('DAV',implode(', ',$features));
-        $this->httpResponse->setHeader('MS-Author-Via','DAV');
-        $this->httpResponse->setHeader('Accept-Ranges','bytes');
-        if (self::$exposeVersion) {
-            $this->httpResponse->setHeader('X-Sabre-Version',Version::VERSION);
-        }
-        $this->httpResponse->setHeader('Content-Length',0);
-        $this->httpResponse->sendStatus(200);
-
-    }
-
-    /**
-     * HTTP GET
-     *
-     * This method simply fetches the contents of a uri, like normal
-     *
-     * @param string $uri
-     * @return bool
-     */
-    protected function httpGet($uri) {
-
-        $node = $this->tree->getNodeForPath($uri,0);
-
-        if (!$this->checkPreconditions(true)) return false;
-        if (!$node instanceof IFile) throw new Exception\NotImplemented('GET is only implemented on File objects');
-
-        $body = $node->get();
-
-        // Converting string into stream, if needed.
-        if (is_string($body)) {
-            $stream = fopen('php://temp','r+');
-            fwrite($stream,$body);
-            rewind($stream);
-            $body = $stream;
-        }
-
-        /*
-         * TODO: getetag, getlastmodified, getsize should also be used using
-         * this method
-         */
-        $httpHeaders = $this->getHTTPHeaders($uri);
-
-        /* ContentType needs to get a default, because many webservers will otherwise
-         * default to text/html, and we don't want this for security reasons.
-         */
-        if (!isset($httpHeaders['Content-Type'])) {
-            $httpHeaders['Content-Type'] = 'application/octet-stream';
-        }
-
-
-        if (isset($httpHeaders['Content-Length'])) {
-
-            $nodeSize = $httpHeaders['Content-Length'];
-
-            // Need to unset Content-Length, because we'll handle that during figuring out the range
-            unset($httpHeaders['Content-Length']);
-
-        } else {
-            $nodeSize = null;
-        }
-
-        $this->httpResponse->setHeaders($httpHeaders);
-
-        $range = $this->getHTTPRange();
-        $ifRange = $this->httpRequest->getHeader('If-Range');
-        $ignoreRangeHeader = false;
-
-        // If ifRange is set, and range is specified, we first need to check
-        // the precondition.
-        if ($nodeSize && $range && $ifRange) {
-
-            // if IfRange is parsable as a date we'll treat it as a DateTime
-            // otherwise, we must treat it as an etag.
-            try {
-                $ifRangeDate = new \DateTime($ifRange);
-
-                // It's a date. We must check if the entity is modified since
-                // the specified date.
-                if (!isset($httpHeaders['Last-Modified'])) $ignoreRangeHeader = true;
-                else {
-                    $modified = new \DateTime($httpHeaders['Last-Modified']);
-                    if($modified > $ifRangeDate) $ignoreRangeHeader = true;
-                }
-
-            } catch (\Exception $e) {
-
-                // It's an entity. We can do a simple comparison.
-                if (!isset($httpHeaders['ETag'])) $ignoreRangeHeader = true;
-                elseif ($httpHeaders['ETag']!==$ifRange) $ignoreRangeHeader = true;
-            }
-        }
-
-        // We're only going to support HTTP ranges if the backend provided a filesize
-        if (!$ignoreRangeHeader && $nodeSize && $range) {
-
-            // Determining the exact byte offsets
-            if (!is_null($range[0])) {
-
-                $start = $range[0];
-                $end = $range[1]?$range[1]:$nodeSize-1;
-                if($start >= $nodeSize)
-                    throw new Exception\RequestedRangeNotSatisfiable('The start offset (' . $range[0] . ') exceeded the size of the entity (' . $nodeSize . ')');
-
-                if($end < $start) throw new Exception\RequestedRangeNotSatisfiable('The end offset (' . $range[1] . ') is lower than the start offset (' . $range[0] . ')');
-                if($end >= $nodeSize) $end = $nodeSize-1;
-
-            } else {
-
-                $start = $nodeSize-$range[1];
-                $end  = $nodeSize-1;
-
-                if ($start<0) $start = 0;
-
-            }
-
-            // New read/write stream
-            $newStream = fopen('php://temp','r+');
-
-            // stream_copy_to_stream() has a bug/feature: the `whence` argument
-            // is interpreted as SEEK_SET (count from absolute offset 0), while
-            // for a stream it should be SEEK_CUR (count from current offset).
-            // If a stream is nonseekable, the function fails. So we *emulate*
-            // the correct behaviour with fseek():
-            if ($start > 0) {
-                if (($curOffs = ftell($body)) === false) $curOffs = 0;
-                fseek($body, $start - $curOffs, SEEK_CUR);
-            }
-            stream_copy_to_stream($body, $newStream, $end-$start+1);
-            rewind($newStream);
-
-            $this->httpResponse->setHeader('Content-Length', $end-$start+1);
-            $this->httpResponse->setHeader('Content-Range','bytes ' . $start . '-' . $end . '/' . $nodeSize);
-            $this->httpResponse->sendStatus(206);
-            $this->httpResponse->sendBody($newStream);
-
-
-        } else {
-
-            if ($nodeSize) $this->httpResponse->setHeader('Content-Length',$nodeSize);
-            $this->httpResponse->sendStatus(200);
-            $this->httpResponse->sendBody($body);
-
-        }
-
-    }
-
-    /**
-     * HTTP HEAD
-     *
-     * This method is normally used to take a peak at a url, and only get the HTTP response headers, without the body
-     * This is used by clients to determine if a remote file was changed, so they can use a local cached version, instead of downloading it again
-     *
-     * @param string $uri
-     * @return void
-     */
-    protected function httpHead($uri) {
-
-        $node = $this->tree->getNodeForPath($uri);
-        /* This information is only collection for File objects.
-         * Ideally we want to throw 405 Method Not Allowed for every
-         * non-file, but MS Office does not like this
-         */
-        if ($node instanceof IFile) {
-            $headers = $this->getHTTPHeaders($this->getRequestUri());
-            if (!isset($headers['Content-Type'])) {
-                $headers['Content-Type'] = 'application/octet-stream';
-            }
-            $this->httpResponse->setHeaders($headers);
-        }
-        $this->httpResponse->sendStatus(200);
-
-    }
-
-    /**
-     * HTTP Delete
-     *
-     * The HTTP delete method, deletes a given uri
-     *
-     * @param string $uri
-     * @return void
-     */
-    protected function httpDelete($uri) {
-
-        // Checking If-None-Match and related headers.
-        if (!$this->checkPreconditions()) return;
-
-        if (!$this->broadcastEvent('beforeUnbind',array($uri))) return;
-        $this->tree->delete($uri);
-        $this->broadcastEvent('afterUnbind',array($uri));
-
-        $this->httpResponse->sendStatus(204);
-        $this->httpResponse->setHeader('Content-Length','0');
-
-    }
-
-
-    /**
-     * WebDAV PROPFIND
-     *
-     * This WebDAV method requests information about an uri resource, or a list of resources
-     * If a client wants to receive the properties for a single resource it will add an HTTP Depth: header with a 0 value
-     * If the value is 1, it means that it also expects a list of sub-resources (e.g.: files in a directory)
-     *
-     * The request body contains an XML data structure that has a list of properties the client understands
-     * The response body is also an xml document, containing information about every uri resource and the requested properties
-     *
-     * It has to return a HTTP 207 Multi-status status code
-     *
-     * @param string $uri
-     * @return void
-     */
-    protected function httpPropfind($uri) {
-
-        $requestedProperties = $this->parsePropFindRequest($this->httpRequest->getBody(true));
-
-        $depth = $this->getHTTPDepth(1);
-        // The only two options for the depth of a propfind is 0 or 1
-        if ($depth!=0) $depth = 1;
-
-        $newProperties = $this->getPropertiesForPath($uri,$requestedProperties,$depth);
-
-        // This is a multi-status response
-        $this->httpResponse->sendStatus(207);
-        $this->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-        $this->httpResponse->setHeader('Vary','Brief,Prefer');
-
-        // Normally this header is only needed for OPTIONS responses, however..
-        // iCal seems to also depend on these being set for PROPFIND. Since
-        // this is not harmful, we'll add it.
-        $features = array('1','3', 'extended-mkcol');
-        foreach($this->plugins as $plugin) $features = array_merge($features,$plugin->getFeatures());
-        $this->httpResponse->setHeader('DAV',implode(', ',$features));
-
-        $prefer = $this->getHTTPPrefer();
-        $minimal = $prefer['return-minimal'];
-
-        $data = $this->generateMultiStatus($newProperties, $minimal);
-        $this->httpResponse->sendBody($data);
-
-    }
-
-    /**
-     * WebDAV PROPPATCH
-     *
-     * This method is called to update properties on a Node. The request is an XML body with all the mutations.
-     * In this XML body it is specified which properties should be set/updated and/or deleted
-     *
-     * @param string $uri
-     * @return void
-     */
-    protected function httpPropPatch($uri) {
-
-        $newProperties = $this->parsePropPatchRequest($this->httpRequest->getBody(true));
-
-        $result = $this->updateProperties($uri, $newProperties);
-
-        $prefer = $this->getHTTPPrefer();
-        $this->httpResponse->setHeader('Vary','Brief,Prefer');
-
-        if ($prefer['return-minimal']) {
-
-            // If return-minimal is specified, we only have to check if the
-            // request was succesful, and don't need to return the
-            // multi-status.
-            $ok = true;
-            foreach($result as $code=>$prop) {
-                if ((int)$code > 299) {
-                    $ok = false;
-                }
-            }
-
-            if ($ok) {
-
-                $this->httpResponse->sendStatus(204);
-                return;
-
-            }
-
-        }
-
-        $this->httpResponse->sendStatus(207);
-        $this->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-
-        $this->httpResponse->sendBody(
-            $this->generateMultiStatus(array($result))
-        );
-
-    }
-
-    /**
-     * HTTP PUT method
-     *
-     * This HTTP method updates a file, or creates a new one.
-     *
-     * If a new resource was created, a 201 Created status code should be returned. If an existing resource is updated, it's a 204 No Content
-     *
-     * @param string $uri
-     * @return bool
-     */
-    protected function httpPut($uri) {
-
-        $body = $this->httpRequest->getBody();
-
-        // Intercepting Content-Range
-        if ($this->httpRequest->getHeader('Content-Range')) {
-            /**
-            Content-Range is dangerous for PUT requests:  PUT per definition
-            stores a full resource.  draft-ietf-httpbis-p2-semantics-15 says
-            in section 7.6:
-              An origin server SHOULD reject any PUT request that contains a
-              Content-Range header field, since it might be misinterpreted as
-              partial content (or might be partial content that is being mistakenly
-              PUT as a full representation).  Partial content updates are possible
-              by targeting a separately identified resource with state that
-              overlaps a portion of the larger resource, or by using a different
-              method that has been specifically defined for partial updates (for
-              example, the PATCH method defined in [RFC5789]).
-            This clarifies RFC2616 section 9.6:
-              The recipient of the entity MUST NOT ignore any Content-*
-              (e.g. Content-Range) headers that it does not understand or implement
-              and MUST return a 501 (Not Implemented) response in such cases.
-            OTOH is a PUT request with a Content-Range currently the only way to
-            continue an aborted upload request and is supported by curl, mod_dav,
-            Tomcat and others.  Since some clients do use this feature which results
-            in unexpected behaviour (cf PEAR::HTTP_WebDAV_Client 1.0.1), we reject
-            all PUT requests with a Content-Range for now.
-            */
-
-            throw new Exception\NotImplemented('PUT with Content-Range is not allowed.');
-        }
-
-        // Intercepting the Finder problem
-        if (($expected = $this->httpRequest->getHeader('X-Expected-Entity-Length')) && $expected > 0) {
-
-            /**
-            Many webservers will not cooperate well with Finder PUT requests,
-            because it uses 'Chunked' transfer encoding for the request body.
-
-            The symptom of this problem is that Finder sends files to the
-            server, but they arrive as 0-length files in PHP.
-
-            If we don't do anything, the user might think they are uploading
-            files successfully, but they end up empty on the server. Instead,
-            we throw back an error if we detect this.
-
-            The reason Finder uses Chunked, is because it thinks the files
-            might change as it's being uploaded, and therefore the
-            Content-Length can vary.
-
-            Instead it sends the X-Expected-Entity-Length header with the size
-            of the file at the very start of the request. If this header is set,
-            but we don't get a request body we will fail the request to
-            protect the end-user.
-            */
-
-            // Only reading first byte
-            $firstByte = fread($body,1);
-            if (strlen($firstByte)!==1) {
-                throw new Exception\Forbidden('This server is not compatible with OS/X finder. Consider using a different WebDAV client or webserver.');
-            }
-
-            // The body needs to stay intact, so we copy everything to a
-            // temporary stream.
-
-            $newBody = fopen('php://temp','r+');
-            fwrite($newBody,$firstByte);
-            stream_copy_to_stream($body, $newBody);
-            rewind($newBody);
-
-            $body = $newBody;
-
-        }
-
-        // Checking If-None-Match and related headers.
-        if (!$this->checkPreconditions()) return;
-
-        if ($this->tree->nodeExists($uri)) {
-
-            $node = $this->tree->getNodeForPath($uri);
-
-            // If the node is a collection, we'll deny it
-            if (!($node instanceof IFile)) throw new Exception\Conflict('PUT is not allowed on non-files.');
-            if (!$this->broadcastEvent('beforeWriteContent',array($uri, $node, &$body))) return false;
-
-            $etag = $node->put($body);
-
-            $this->broadcastEvent('afterWriteContent',array($uri, $node));
-
-            $this->httpResponse->setHeader('Content-Length','0');
-            if ($etag) $this->httpResponse->setHeader('ETag',$etag);
-            $this->httpResponse->sendStatus(204);
-
-        } else {
-
-            $etag = null;
-            // If we got here, the resource didn't exist yet.
-            if (!$this->createFile($this->getRequestUri(),$body,$etag)) {
-                // For one reason or another the file was not created.
-                return;
-            }
-
-            $this->httpResponse->setHeader('Content-Length','0');
-            if ($etag) $this->httpResponse->setHeader('ETag', $etag);
-            $this->httpResponse->sendStatus(201);
-
-        }
-
-    }
-
-
-    /**
-     * WebDAV MKCOL
-     *
-     * The MKCOL method is used to create a new collection (directory) on the server
-     *
-     * @param string $uri
-     * @return void
-     */
-    protected function httpMkcol($uri) {
-
-        $requestBody = $this->httpRequest->getBody(true);
-
-        if ($requestBody) {
-
-            $contentType = $this->httpRequest->getHeader('Content-Type');
-            if (strpos($contentType,'application/xml')!==0 && strpos($contentType,'text/xml')!==0) {
-
-                // We must throw 415 for unsupported mkcol bodies
-                throw new Exception\UnsupportedMediaType('The request body for the MKCOL request must have an xml Content-Type');
-
-            }
-
-            $dom = XMLUtil::loadDOMDocument($requestBody);
-            if (XMLUtil::toClarkNotation($dom->firstChild)!=='{DAV:}mkcol') {
-
-                // We must throw 415 for unsupported mkcol bodies
-                throw new Exception\UnsupportedMediaType('The request body for the MKCOL request must be a {DAV:}mkcol request construct.');
-
-            }
-
-            $properties = array();
-            foreach($dom->firstChild->childNodes as $childNode) {
-
-                if (XMLUtil::toClarkNotation($childNode)!=='{DAV:}set') continue;
-                $properties = array_merge($properties, XMLUtil::parseProperties($childNode, $this->propertyMap));
-
-            }
-            if (!isset($properties['{DAV:}resourcetype']))
-                throw new Exception\BadRequest('The mkcol request must include a {DAV:}resourcetype property');
-
-            $resourceType = $properties['{DAV:}resourcetype']->getValue();
-            unset($properties['{DAV:}resourcetype']);
-
-        } else {
-
-            $properties = array();
-            $resourceType = array('{DAV:}collection');
-
-        }
-
-        $result = $this->createCollection($uri, $resourceType, $properties);
-
-        if (is_array($result)) {
-            $this->httpResponse->sendStatus(207);
-            $this->httpResponse->setHeader('Content-Type','application/xml; charset=utf-8');
-
-            $this->httpResponse->sendBody(
-                $this->generateMultiStatus(array($result))
-            );
-
-        } else {
-            $this->httpResponse->setHeader('Content-Length','0');
-            $this->httpResponse->sendStatus(201);
-        }
-
-    }
-
-    /**
-     * WebDAV HTTP MOVE method
-     *
-     * This method moves one uri to a different uri. A lot of the actual request processing is done in getCopyMoveInfo
-     *
-     * @param string $uri
-     * @return bool
-     */
-    protected function httpMove($uri) {
-
-        $moveInfo = $this->getCopyAndMoveInfo();
-
-        // If the destination is part of the source tree, we must fail
-        if ($moveInfo['destination']==$uri)
-            throw new Exception\Forbidden('Source and destination uri are identical.');
-
-        if ($moveInfo['destinationExists']) {
-
-            if (!$this->broadcastEvent('beforeUnbind',array($moveInfo['destination']))) return false;
-            $this->tree->delete($moveInfo['destination']);
-            $this->broadcastEvent('afterUnbind',array($moveInfo['destination']));
-
-        }
-
-        if (!$this->broadcastEvent('beforeUnbind',array($uri))) return false;
-        if (!$this->broadcastEvent('beforeBind',array($moveInfo['destination']))) return false;
-        $this->tree->move($uri,$moveInfo['destination']);
-        $this->broadcastEvent('afterUnbind',array($uri));
-        $this->broadcastEvent('afterBind',array($moveInfo['destination']));
-
-        // If a resource was overwritten we should send a 204, otherwise a 201
-        $this->httpResponse->setHeader('Content-Length','0');
-        $this->httpResponse->sendStatus($moveInfo['destinationExists']?204:201);
-
-    }
-
-    /**
-     * WebDAV HTTP COPY method
-     *
-     * This method copies one uri to a different uri, and works much like the MOVE request
-     * A lot of the actual request processing is done in getCopyMoveInfo
-     *
-     * @param string $uri
-     * @return bool
-     */
-    protected function httpCopy($uri) {
-
-        $copyInfo = $this->getCopyAndMoveInfo();
-        // If the destination is part of the source tree, we must fail
-        if ($copyInfo['destination']==$uri)
-            throw new Exception\Forbidden('Source and destination uri are identical.');
-
-        if ($copyInfo['destinationExists']) {
-            if (!$this->broadcastEvent('beforeUnbind',array($copyInfo['destination']))) return false;
-            $this->tree->delete($copyInfo['destination']);
-
-        }
-        if (!$this->broadcastEvent('beforeBind',array($copyInfo['destination']))) return false;
-        $this->tree->copy($uri,$copyInfo['destination']);
-        $this->broadcastEvent('afterBind',array($copyInfo['destination']));
-
-        // If a resource was overwritten we should send a 204, otherwise a 201
-        $this->httpResponse->setHeader('Content-Length','0');
-        $this->httpResponse->sendStatus($copyInfo['destinationExists']?204:201);
-
-    }
-
-
-
-    /**
-     * HTTP REPORT method implementation
-     *
-     * Although the REPORT method is not part of the standard WebDAV spec (it's from rfc3253)
-     * It's used in a lot of extensions, so it made sense to implement it into the core.
-     *
-     * @param string $uri
-     * @return void
-     */
-    protected function httpReport($uri) {
-
-        $body = $this->httpRequest->getBody(true);
-        $dom = XMLUtil::loadDOMDocument($body);
-
-        $reportName = XMLUtil::toClarkNotation($dom->firstChild);
-
-        if ($this->broadcastEvent('report',array($reportName,$dom, $uri))) {
-
-            // If broadcastEvent returned true, it means the report was not supported
-            throw new Exception\ReportNotSupported();
-
-        }
-
-    }
-
-    // }}}
-    // {{{ HTTP/WebDAV protocol helpers
-
-    /**
-     * Returns an array with all the supported HTTP methods for a specific uri.
-     *
-     * @param string $uri
-     * @return array
-     */
-    public function getAllowedMethods($uri) {
-
-        $methods = array(
-            'OPTIONS',
-            'GET',
-            'HEAD',
-            'DELETE',
-            'PROPFIND',
-            'PUT',
-            'PROPPATCH',
-            'COPY',
-            'MOVE',
-            'REPORT'
-        );
-
-        // The MKCOL is only allowed on an unmapped uri
-        try {
-            $this->tree->getNodeForPath($uri);
-        } catch (Exception\NotFound $e) {
-            $methods[] = 'MKCOL';
-        }
-
-        // We're also checking if any of the plugins register any new methods
-        foreach($this->plugins as $plugin) $methods = array_merge($methods, $plugin->getHTTPMethods($uri));
-        array_unique($methods);
-
-        return $methods;
-
-    }
-
-    /**
-     * Gets the uri for the request, keeping the base uri into consideration
-     *
-     * @return string
-     */
-    public function getRequestUri() {
-
-        return $this->calculateUri($this->httpRequest->getUri());
-
-    }
-
-    /**
-     * Calculates the uri for a request, making sure that the base uri is stripped out
-     *
-     * @param string $uri
-     * @throws Exception\Forbidden A permission denied exception is thrown whenever there was an attempt to supply a uri outside of the base uri
-     * @return string
-     */
-    public function calculateUri($uri) {
-
-        if ($uri[0]!='/' && strpos($uri,'://')) {
-
-            $uri = parse_url($uri,PHP_URL_PATH);
-
-        }
-
-        $uri = str_replace('//','/',$uri);
-
-        if (strpos($uri,$this->getBaseUri())===0) {
-
-            return trim(URLUtil::decodePath(substr($uri,strlen($this->getBaseUri()))),'/');
-
-        // A special case, if the baseUri was accessed without a trailing
-        // slash, we'll accept it as well.
-        } elseif ($uri.'/' === $this->getBaseUri()) {
-
-            return '';
-
-        } else {
-
-            throw new Exception\Forbidden('Requested uri (' . $uri . ') is out of base uri (' . $this->getBaseUri() . ')');
-
-        }
-
-    }
-
-    /**
-     * Returns the HTTP depth header
-     *
-     * This method returns the contents of the HTTP depth request header. If the depth header was 'infinity' it will return the Sabre\DAV\Server::DEPTH_INFINITY object
-     * It is possible to supply a default depth value, which is used when the depth header has invalid content, or is completely non-existent
-     *
-     * @param mixed $default
-     * @return int
-     */
-    public function getHTTPDepth($default = self::DEPTH_INFINITY) {
-
-        // If its not set, we'll grab the default
-        $depth = $this->httpRequest->getHeader('Depth');
-
-        if (is_null($depth)) return $default;
-
-        if ($depth == 'infinity') return self::DEPTH_INFINITY;
-
-
-        // If its an unknown value. we'll grab the default
-        if (!ctype_digit($depth)) return $default;
-
-        return (int)$depth;
-
-    }
-
-    /**
-     * Returns the HTTP range header
-     *
-     * This method returns null if there is no well-formed HTTP range request
-     * header or array($start, $end).
-     *
-     * The first number is the offset of the first byte in the range.
-     * The second number is the offset of the last byte in the range.
-     *
-     * If the second offset is null, it should be treated as the offset of the last byte of the entity
-     * If the first offset is null, the second offset should be used to retrieve the last x bytes of the entity
-     *
-     * @return array|null
-     */
-    public function getHTTPRange() {
-
-        $range = $this->httpRequest->getHeader('range');
-        if (is_null($range)) return null;
-
-        // Matching "Range: bytes=1234-5678: both numbers are optional
-
-        if (!preg_match('/^bytes=([0-9]*)-([0-9]*)$/i',$range,$matches)) return null;
-
-        if ($matches[1]==='' && $matches[2]==='') return null;
-
-        return array(
-            $matches[1]!==''?$matches[1]:null,
-            $matches[2]!==''?$matches[2]:null,
-        );
-
-    }
-
-    /**
-     * Returns the HTTP Prefer header information.
-     *
-     * The prefer header is defined in:
-     * http://tools.ietf.org/html/draft-snell-http-prefer-14
-     *
-     * This method will return an array with options.
-     *
-     * Currently, the following options may be returned:
-     *   array(
-     *      'return-asynch'         => true,
-     *      'return-minimal'        => true,
-     *      'return-representation' => true,
-     *      'wait'                  => 30,
-     *      'strict'                => true,
-     *      'lenient'               => true,
-     *   )
-     *
-     * This method also supports the Brief header, and will also return
-     * 'return-minimal' if the brief header was set to 't'.
-     *
-     * For the boolean options, false will be returned if the headers are not
-     * specified. For the integer options it will be 'null'.
-     *
-     * @return array
-     */
-    public function getHTTPPrefer() {
-
-        $result = array(
-            'return-asynch'         => false,
-            'return-minimal'        => false,
-            'return-representation' => false,
-            'wait'                  => null,
-            'strict'                => false,
-            'lenient'               => false,
-        );
-
-        if ($prefer = $this->httpRequest->getHeader('Prefer')) {
-
-            $parameters = array_map('trim',
-                explode(',', $prefer)
-            );
-
-            foreach($parameters as $parameter) {
-
-                // Right now our regex only supports the tokens actually
-                // specified in the draft. We may need to expand this if new
-                // tokens get registered.
-                if(!preg_match('/^(?P<token>[a-z0-9-]+)(?:=(?P<value>[0-9]+))?$/', $parameter, $matches)) {
-                    continue;
-                }
-
-                switch($matches['token']) {
-
-                    case 'return-asynch' :
-                    case 'return-minimal' :
-                    case 'return-representation' :
-                    case 'strict' :
-                    case 'lenient' :
-                        $result[$matches['token']] = true;
-                        break;
-                    case 'wait' :
-                        $result[$matches['token']] = $matches['value'];
-                        break;
-
-                }
-
-            }
-
-        }
-
-        if ($this->httpRequest->getHeader('Brief')=='t') {
-            $result['return-minimal'] = true;
-        }
-
-        return $result;
-
-    }
-
-
-    /**
-     * Returns information about Copy and Move requests
-     *
-     * This function is created to help getting information about the source and the destination for the
-     * WebDAV MOVE and COPY HTTP request. It also validates a lot of information and throws proper exceptions
-     *
-     * The returned value is an array with the following keys:
-     *   * destination - Destination path
-     *   * destinationExists - Whether or not the destination is an existing url (and should therefore be overwritten)
-     *
-     * @return array
-     */
-    public function getCopyAndMoveInfo() {
-
-        // Collecting the relevant HTTP headers
-        if (!$this->httpRequest->getHeader('Destination')) throw new Exception\BadRequest('The destination header was not supplied');
-        $destination = $this->calculateUri($this->httpRequest->getHeader('Destination'));
-        $overwrite = $this->httpRequest->getHeader('Overwrite');
-        if (!$overwrite) $overwrite = 'T';
-        if (strtoupper($overwrite)=='T') $overwrite = true;
-        elseif (strtoupper($overwrite)=='F') $overwrite = false;
-        // We need to throw a bad request exception, if the header was invalid
-        else throw new Exception\BadRequest('The HTTP Overwrite header should be either T or F');
-
-        list($destinationDir) = URLUtil::splitPath($destination);
-
-        try {
-            $destinationParent = $this->tree->getNodeForPath($destinationDir);
-            if (!($destinationParent instanceof ICollection)) throw new Exception\UnsupportedMediaType('The destination node is not a collection');
-        } catch (Exception\NotFound $e) {
-
-            // If the destination parent node is not found, we throw a 409
-            throw new Exception\Conflict('The destination node is not found');
-        }
-
-        try {
-
-            $destinationNode = $this->tree->getNodeForPath($destination);
-
-            // If this succeeded, it means the destination already exists
-            // we'll need to throw precondition failed in case overwrite is false
-            if (!$overwrite) throw new Exception\PreconditionFailed('The destination node already exists, and the overwrite header is set to false','Overwrite');
-
-        } catch (Exception\NotFound $e) {
-
-            // Destination didn't exist, we're all good
-            $destinationNode = false;
-
-
-
-        }
-
-        // These are the three relevant properties we need to return
-        return array(
-            'destination'       => $destination,
-            'destinationExists' => $destinationNode==true,
-            'destinationNode'   => $destinationNode,
-        );
-
-    }
-
-    /**
-     * Returns a list of properties for a path
-     *
-     * This is a simplified version getPropertiesForPath.
-     * if you aren't interested in status codes, but you just
-     * want to have a flat list of properties. Use this method.
-     *
-     * @param string $path
-     * @param array $propertyNames
-     */
-    public function getProperties($path, $propertyNames) {
-
-        $result = $this->getPropertiesForPath($path,$propertyNames,0);
-        return $result[0][200];
-
-    }
-
-    /**
-     * A kid-friendly way to fetch properties for a node's children.
-     *
-     * The returned array will be indexed by the path of the of child node.
-     * Only properties that are actually found will be returned.
-     *
-     * The parent node will not be returned.
-     *
-     * @param string $path
-     * @param array $propertyNames
-     * @return array
-     */
-    public function getPropertiesForChildren($path, $propertyNames) {
-
-        $result = array();
-        foreach($this->getPropertiesForPath($path,$propertyNames,1) as $k=>$row) {
-
-            // Skipping the parent path
-            if ($k === 0) continue;
-
-            $result[$row['href']] = $row[200];
-
-        }
-        return $result;
-
-    }
-
-    /**
-     * Returns a list of HTTP headers for a particular resource
-     *
-     * The generated http headers are based on properties provided by the
-     * resource. The method basically provides a simple mapping between
-     * DAV property and HTTP header.
-     *
-     * The headers are intended to be used for HEAD and GET requests.
-     *
-     * @param string $path
-     * @return array
-     */
-    public function getHTTPHeaders($path) {
-
-        $propertyMap = array(
-            '{DAV:}getcontenttype'   => 'Content-Type',
-            '{DAV:}getcontentlength' => 'Content-Length',
-            '{DAV:}getlastmodified'  => 'Last-Modified',
-            '{DAV:}getetag'          => 'ETag',
-        );
-
-        $properties = $this->getProperties($path,array_keys($propertyMap));
-
-        $headers = array();
-        foreach($propertyMap as $property=>$header) {
-            if (!isset($properties[$property])) continue;
-
-            if (is_scalar($properties[$property])) {
-                $headers[$header] = $properties[$property];
-
-            // GetLastModified gets special cased
-            } elseif ($properties[$property] instanceof Property\GetLastModified) {
-                $headers[$header] = HTTP\Util::toHTTPDate($properties[$property]->getTime());
-            }
-
-        }
-
-        return $headers;
-
-    }
-
-    /**
-     * Returns a list of properties for a given path
-     *
-     * The path that should be supplied should have the baseUrl stripped out
-     * The list of properties should be supplied in Clark notation. If the list is empty
-     * 'allprops' is assumed.
-     *
-     * If a depth of 1 is requested child elements will also be returned.
-     *
-     * @param string $path
-     * @param array $propertyNames
-     * @param int $depth
-     * @return array
-     */
-    public function getPropertiesForPath($path, $propertyNames = array(), $depth = 0) {
-
-        if ($depth!=0) $depth = 1;
-
-        $path = rtrim($path,'/');
-
-        // This event allows people to intercept these requests early on in the
-        // process.
-        //
-        // We're not doing anything with the result, but this can be helpful to
-        // pre-fetch certain expensive live properties.
-        $this->broadCastEvent('beforeGetPropertiesForPath', array($path, $propertyNames, $depth));
-
-        $returnPropertyList = array();
-
-        $parentNode = $this->tree->getNodeForPath($path);
-        $nodes = array(
-            $path => $parentNode
-        );
-        if ($depth==1 && $parentNode instanceof ICollection) {
-            foreach($this->tree->getChildren($path) as $childNode)
-                $nodes[$path . '/' . $childNode->getName()] = $childNode;
-        }
-
-        // If the propertyNames array is empty, it means all properties are requested.
-        // We shouldn't actually return everything we know though, and only return a
-        // sensible list.
-        $allProperties = count($propertyNames)==0;
-
-        foreach($nodes as $myPath=>$node) {
-
-            $currentPropertyNames = $propertyNames;
-
-            $newProperties = array(
-                '200' => array(),
-                '404' => array(),
-            );
-
-            if ($allProperties) {
-                // Default list of propertyNames, when all properties were requested.
-                $currentPropertyNames = array(
-                    '{DAV:}getlastmodified',
-                    '{DAV:}getcontentlength',
-                    '{DAV:}resourcetype',
-                    '{DAV:}quota-used-bytes',
-                    '{DAV:}quota-available-bytes',
-                    '{DAV:}getetag',
-                    '{DAV:}getcontenttype',
-                );
-            }
-
-            // If the resourceType was not part of the list, we manually add it
-            // and mark it for removal. We need to know the resourcetype in order
-            // to make certain decisions about the entry.
-            // WebDAV dictates we should add a / and the end of href's for collections
-            $removeRT = false;
-            if (!in_array('{DAV:}resourcetype',$currentPropertyNames)) {
-                $currentPropertyNames[] = '{DAV:}resourcetype';
-                $removeRT = true;
-            }
-
-            $result = $this->broadcastEvent('beforeGetProperties',array($myPath, $node, &$currentPropertyNames, &$newProperties));
-            // If this method explicitly returned false, we must ignore this
-            // node as it is inaccessible.
-            if ($result===false) continue;
-
-            if (count($currentPropertyNames) > 0) {
-
-                if ($node instanceof IProperties) {
-                    $nodeProperties = $node->getProperties($currentPropertyNames);
-
-                    // The getProperties method may give us too much,
-                    // properties, in case the implementor was lazy.
-                    //
-                    // So as we loop through this list, we will only take the
-                    // properties that were actually requested and discard the
-                    // rest.
-                    foreach($currentPropertyNames as $k=>$currentPropertyName) {
-                        if (isset($nodeProperties[$currentPropertyName])) {
-                            unset($currentPropertyNames[$k]);
-                            $newProperties[200][$currentPropertyName] = $nodeProperties[$currentPropertyName];
-                        }
-                    }
-
-                }
-
-            }
-
-            foreach($currentPropertyNames as $prop) {
-
-                if (isset($newProperties[200][$prop])) continue;
-
-                switch($prop) {
-                    case '{DAV:}getlastmodified'       : if ($node->getLastModified()) $newProperties[200][$prop] = new Property\GetLastModified($node->getLastModified()); break;
-                    case '{DAV:}getcontentlength'      :
-                        if ($node instanceof IFile) {
-                            $size = $node->getSize();
-                            if (!is_null($size)) {
-                                $newProperties[200][$prop] = (int)$node->getSize();
-                            }
-                        }
-                        break;
-                    case '{DAV:}quota-used-bytes'      :
-                        if ($node instanceof IQuota) {
-                            $quotaInfo = $node->getQuotaInfo();
-                            $newProperties[200][$prop] = $quotaInfo[0];
-                        }
-                        break;
-                    case '{DAV:}quota-available-bytes' :
-                        if ($node instanceof IQuota) {
-                            $quotaInfo = $node->getQuotaInfo();
-                            $newProperties[200][$prop] = $quotaInfo[1];
-                        }
-                        break;
-                    case '{DAV:}getetag'               : if ($node instanceof IFile && $etag = $node->getETag())  $newProperties[200][$prop] = $etag; break;
-                    case '{DAV:}getcontenttype'        : if ($node instanceof IFile && $ct = $node->getContentType())  $newProperties[200][$prop] = $ct; break;
-                    case '{DAV:}supported-report-set'  :
-                        $reports = array();
-                        foreach($this->plugins as $plugin) {
-                            $reports = array_merge($reports, $plugin->getSupportedReportSet($myPath));
-                        }
-                        $newProperties[200][$prop] = new Property\SupportedReportSet($reports);
-                        break;
-                    case '{DAV:}resourcetype' :
-                        $newProperties[200]['{DAV:}resourcetype'] = new Property\ResourceType();
-                        foreach($this->resourceTypeMapping as $className => $resourceType) {
-                            if ($node instanceof $className) $newProperties[200]['{DAV:}resourcetype']->add($resourceType);
-                        }
-                        break;
-
-                }
-
-                // If we were unable to find the property, we will list it as 404.
-                if (!$allProperties && !isset($newProperties[200][$prop])) $newProperties[404][$prop] = null;
-
-            }
-
-            $this->broadcastEvent('afterGetProperties',array(trim($myPath,'/'),&$newProperties, $node));
-
-            $newProperties['href'] = trim($myPath,'/');
-
-            // Its is a WebDAV recommendation to add a trailing slash to collectionnames.
-            // Apple's iCal also requires a trailing slash for principals (rfc 3744), though this is non-standard.
-            if ($myPath!='' && isset($newProperties[200]['{DAV:}resourcetype'])) {
-                $rt = $newProperties[200]['{DAV:}resourcetype'];
-                if ($rt->is('{DAV:}collection') || $rt->is('{DAV:}principal')) {
-                    $newProperties['href'] .='/';
-                }
-            }
-
-            // If the resourcetype property was manually added to the requested property list,
-            // we will remove it again.
-            if ($removeRT) unset($newProperties[200]['{DAV:}resourcetype']);
-
-            $returnPropertyList[] = $newProperties;
-
-        }
-
-        return $returnPropertyList;
-
-    }
-
-    /**
-     * This method is invoked by sub-systems creating a new file.
-     *
-     * Currently this is done by HTTP PUT and HTTP LOCK (in the Locks_Plugin).
-     * It was important to get this done through a centralized function,
-     * allowing plugins to intercept this using the beforeCreateFile event.
-     *
-     * This method will return true if the file was actually created
-     *
-     * @param string   $uri
-     * @param resource $data
-     * @param string   $etag
-     * @return bool
-     */
-    public function createFile($uri,$data, &$etag = null) {
-
-        list($dir,$name) = URLUtil::splitPath($uri);
-
-        if (!$this->broadcastEvent('beforeBind',array($uri))) return false;
-
-        $parent = $this->tree->getNodeForPath($dir);
-        if (!$parent instanceof ICollection) {
-            throw new Exception\Conflict('Files can only be created as children of collections');
-        }
-
-        if (!$this->broadcastEvent('beforeCreateFile',array($uri, &$data, $parent))) return false;
-
-        $etag = $parent->createFile($name,$data);
-        $this->tree->markDirty($dir . '/' . $name);
-
-        $this->broadcastEvent('afterBind',array($uri));
-        $this->broadcastEvent('afterCreateFile',array($uri, $parent));
-
-        return true;
-    }
-
-    /**
-     * This method is invoked by sub-systems creating a new directory.
-     *
-     * @param string $uri
-     * @return void
-     */
-    public function createDirectory($uri) {
-
-        $this->createCollection($uri,array('{DAV:}collection'),array());
-
-    }
-
-    /**
-     * Use this method to create a new collection
-     *
-     * The {DAV:}resourcetype is specified using the resourceType array.
-     * At the very least it must contain {DAV:}collection.
-     *
-     * The properties array can contain a list of additional properties.
-     *
-     * @param string $uri The new uri
-     * @param array $resourceType The resourceType(s)
-     * @param array $properties A list of properties
-     * @return array|null
-     */
-    public function createCollection($uri, array $resourceType, array $properties) {
-
-        list($parentUri,$newName) = URLUtil::splitPath($uri);
-
-        // Making sure {DAV:}collection was specified as resourceType
-        if (!in_array('{DAV:}collection', $resourceType)) {
-            throw new Exception\InvalidResourceType('The resourceType for this collection must at least include {DAV:}collection');
-        }
-
-
-        // Making sure the parent exists
-        try {
-
-            $parent = $this->tree->getNodeForPath($parentUri);
-
-        } catch (Exception\NotFound $e) {
-
-            throw new Exception\Conflict('Parent node does not exist');
-
-        }
-
-        // Making sure the parent is a collection
-        if (!$parent instanceof ICollection) {
-            throw new Exception\Conflict('Parent node is not a collection');
-        }
-
-
-
-        // Making sure the child does not already exist
-        try {
-            $parent->getChild($newName);
-
-            // If we got here.. it means there's already a node on that url, and we need to throw a 405
-            throw new Exception\MethodNotAllowed('The resource you tried to create already exists');
-
-        } catch (Exception\NotFound $e) {
-            // This is correct
-        }
-
-
-        if (!$this->broadcastEvent('beforeBind',array($uri))) return;
-
-        // There are 2 modes of operation. The standard collection
-        // creates the directory, and then updates properties
-        // the extended collection can create it directly.
-        if ($parent instanceof IExtendedCollection) {
-
-            $parent->createExtendedCollection($newName, $resourceType, $properties);
-
-        } else {
-
-            // No special resourcetypes are supported
-            if (count($resourceType)>1) {
-                throw new Exception\InvalidResourceType('The {DAV:}resourcetype you specified is not supported here.');
-            }
-
-            $parent->createDirectory($newName);
-            $rollBack = false;
-            $exception = null;
-            $errorResult = null;
-
-            if (count($properties)>0) {
-
-                try {
-
-                    $errorResult = $this->updateProperties($uri, $properties);
-                    if (!isset($errorResult[200])) {
-                        $rollBack = true;
-                    }
-
-                } catch (Exception $e) {
-
-                    $rollBack = true;
-                    $exception = $e;
-
-                }
-
-            }
-
-            if ($rollBack) {
-                if (!$this->broadcastEvent('beforeUnbind',array($uri))) return;
-                $this->tree->delete($uri);
-
-                // Re-throwing exception
-                if ($exception) throw $exception;
-
-                return $errorResult;
-            }
-
-        }
-        $this->tree->markDirty($parentUri);
-        $this->broadcastEvent('afterBind',array($uri));
-
-    }
-
-    /**
-     * This method updates a resource's properties
-     *
-     * The properties array must be a list of properties. Array-keys are
-     * property names in clarknotation, array-values are it's values.
-     * If a property must be deleted, the value should be null.
-     *
-     * Note that this request should either completely succeed, or
-     * completely fail.
-     *
-     * The response is an array with statuscodes for keys, which in turn
-     * contain arrays with propertynames. This response can be used
-     * to generate a multistatus body.
-     *
-     * @param string $uri
-     * @param array $properties
-     * @return array
-     */
-    public function updateProperties($uri, array $properties) {
-
-        // we'll start by grabbing the node, this will throw the appropriate
-        // exceptions if it doesn't.
-        $node = $this->tree->getNodeForPath($uri);
-
-        $result = array(
-            200 => array(),
-            403 => array(),
-            424 => array(),
-        );
-        $remainingProperties = $properties;
-        $hasError = false;
-
-        // Running through all properties to make sure none of them are protected
-        if (!$hasError) foreach($properties as $propertyName => $value) {
-            if(in_array($propertyName, $this->protectedProperties)) {
-                $result[403][$propertyName] = null;
-                unset($remainingProperties[$propertyName]);
-                $hasError = true;
-            }
-        }
-
-        if (!$hasError) {
-            // Allowing plugins to take care of property updating
-            $hasError = !$this->broadcastEvent('updateProperties',array(
-                &$remainingProperties,
-                &$result,
-                $node
-            ));
-        }
-
-        // If the node is not an instance of Sabre\DAV\IProperties, every
-        // property is 403 Forbidden
-        if (!$hasError && count($remainingProperties) && !($node instanceof IProperties)) {
-            $hasError = true;
-            foreach($properties as $propertyName=> $value) {
-                $result[403][$propertyName] = null;
-            }
-            $remainingProperties = array();
-        }
-
-        // Only if there were no errors we may attempt to update the resource
-        if (!$hasError) {
-
-            if (count($remainingProperties)>0) {
-
-                $updateResult = $node->updateProperties($remainingProperties);
-
-                if ($updateResult===true) {
-                    // success
-                    foreach($remainingProperties as $propertyName=>$value) {
-                        $result[200][$propertyName] = null;
-                    }
-
-                } elseif ($updateResult===false) {
-                    // The node failed to update the properties for an
-                    // unknown reason
-                    foreach($remainingProperties as $propertyName=>$value) {
-                        $result[403][$propertyName] = null;
-                    }
-
-                } elseif (is_array($updateResult)) {
-
-                    // The node has detailed update information
-                    // We need to merge the results with the earlier results.
-                    foreach($updateResult as $status => $props) {
-                        if (is_array($props)) {
-                            if (!isset($result[$status]))
-                                $result[$status] = array();
-
-                            $result[$status] = array_merge($result[$status], $updateResult[$status]);
-                        }
-                    }
-
-                } else {
-                    throw new Exception('Invalid result from updateProperties');
-                }
-                $remainingProperties = array();
-            }
-
-        }
-
-        foreach($remainingProperties as $propertyName=>$value) {
-            // if there are remaining properties, it must mean
-            // there's a dependency failure
-            $result[424][$propertyName] = null;
-        }
-
-        // Removing empty array values
-        foreach($result as $status=>$props) {
-
-            if (count($props)===0) unset($result[$status]);
-
-        }
-        $result['href'] = $uri;
-        return $result;
-
-    }
-
-    /**
-     * This method checks the main HTTP preconditions.
-     *
-     * Currently these are:
-     *   * If-Match
-     *   * If-None-Match
-     *   * If-Modified-Since
-     *   * If-Unmodified-Since
-     *
-     * The method will return true if all preconditions are met
-     * The method will return false, or throw an exception if preconditions
-     * failed. If false is returned the operation should be aborted, and
-     * the appropriate HTTP response headers are already set.
-     *
-     * Normally this method will throw 412 Precondition Failed for failures
-     * related to If-None-Match, If-Match and If-Unmodified Since. It will
-     * set the status to 304 Not Modified for If-Modified_since.
-     *
-     * If the $handleAsGET argument is set to true, it will also return 304
-     * Not Modified for failure of the If-None-Match precondition. This is the
-     * desired behaviour for HTTP GET and HTTP HEAD requests.
-     *
-     * @param bool $handleAsGET
-     * @return bool
-     */
-    public function checkPreconditions($handleAsGET = false) {
-
-        $uri = $this->getRequestUri();
-        $node = null;
-        $lastMod = null;
-        $etag = null;
-
-        if ($ifMatch = $this->httpRequest->getHeader('If-Match')) {
-
-            // If-Match contains an entity tag. Only if the entity-tag
-            // matches we are allowed to make the request succeed.
-            // If the entity-tag is '*' we are only allowed to make the
-            // request succeed if a resource exists at that url.
-            try {
-                $node = $this->tree->getNodeForPath($uri);
-            } catch (Exception\NotFound $e) {
-                throw new Exception\PreconditionFailed('An If-Match header was specified and the resource did not exist','If-Match');
-            }
-
-            // Only need to check entity tags if they are not *
-            if ($ifMatch!=='*') {
-
-                // There can be multiple etags
-                $ifMatch = explode(',',$ifMatch);
-                $haveMatch = false;
-                foreach($ifMatch as $ifMatchItem) {
-
-                    // Stripping any extra spaces
-                    $ifMatchItem = trim($ifMatchItem,' ');
-
-                    $etag = $node->getETag();
-                    if ($etag===$ifMatchItem) {
-                        $haveMatch = true;
-                    } else {
-                        // Evolution has a bug where it sometimes prepends the "
-                        // with a \. This is our workaround.
-                        if (str_replace('\\"','"', $ifMatchItem) === $etag) {
-                            $haveMatch = true;
-                        }
-                    }
-
-                }
-                if (!$haveMatch) {
-                     throw new Exception\PreconditionFailed('An If-Match header was specified, but none of the specified the ETags matched.','If-Match');
-                }
-            }
-        }
-
-        if ($ifNoneMatch = $this->httpRequest->getHeader('If-None-Match')) {
-
-            // The If-None-Match header contains an etag.
-            // Only if the ETag does not match the current ETag, the request will succeed
-            // The header can also contain *, in which case the request
-            // will only succeed if the entity does not exist at all.
-            $nodeExists = true;
-            if (!$node) {
-                try {
-                    $node = $this->tree->getNodeForPath($uri);
-                } catch (Exception\NotFound $e) {
-                    $nodeExists = false;
-                }
-            }
-            if ($nodeExists) {
-                $haveMatch = false;
-                if ($ifNoneMatch==='*') $haveMatch = true;
-                else {
-
-                    // There might be multiple etags
-                    $ifNoneMatch = explode(',', $ifNoneMatch);
-                    $etag = $node->getETag();
-
-                    foreach($ifNoneMatch as $ifNoneMatchItem) {
-
-                        // Stripping any extra spaces
-                        $ifNoneMatchItem = trim($ifNoneMatchItem,' ');
-
-                        if ($etag===$ifNoneMatchItem) $haveMatch = true;
-
-                    }
-
-                }
-
-                if ($haveMatch) {
-                    if ($handleAsGET) {
-                        $this->httpResponse->sendStatus(304);
-                        return false;
-                    } else {
-                        throw new Exception\PreconditionFailed('An If-None-Match header was specified, but the ETag matched (or * was specified).','If-None-Match');
-                    }
-                }
-            }
-
-        }
-
-        if (!$ifNoneMatch && ($ifModifiedSince = $this->httpRequest->getHeader('If-Modified-Since'))) {
-
-            // The If-Modified-Since header contains a date. We
-            // will only return the entity if it has been changed since
-            // that date. If it hasn't been changed, we return a 304
-            // header
-            // Note that this header only has to be checked if there was no If-None-Match header
-            // as per the HTTP spec.
-            $date = HTTP\Util::parseHTTPDate($ifModifiedSince);
-
-            if ($date) {
-                if (is_null($node)) {
-                    $node = $this->tree->getNodeForPath($uri);
-                }
-                $lastMod = $node->getLastModified();
-                if ($lastMod) {
-                    $lastMod = new \DateTime('@' . $lastMod);
-                    if ($lastMod <= $date) {
-                        $this->httpResponse->sendStatus(304);
-                        $this->httpResponse->setHeader('Last-Modified', HTTP\Util::toHTTPDate($lastMod));
-                        return false;
-                    }
-                }
-            }
-        }
-
-        if ($ifUnmodifiedSince = $this->httpRequest->getHeader('If-Unmodified-Since')) {
-
-            // The If-Unmodified-Since will allow allow the request if the
-            // entity has not changed since the specified date.
-            $date = HTTP\Util::parseHTTPDate($ifUnmodifiedSince);
-
-            // We must only check the date if it's valid
-            if ($date) {
-                if (is_null($node)) {
-                    $node = $this->tree->getNodeForPath($uri);
-                }
-                $lastMod = $node->getLastModified();
-                if ($lastMod) {
-                    $lastMod = new \DateTime('@' . $lastMod);
-                    if ($lastMod > $date) {
-                        throw new Exception\PreconditionFailed('An If-Unmodified-Since header was specified, but the entity has been changed since the specified date.','If-Unmodified-Since');
-                    }
-                }
-            }
-
-        }
-        return true;
-
-    }
-
-    // }}}
-    // {{{ XML Readers & Writers
-
-
-    /**
-     * Generates a WebDAV propfind response body based on a list of nodes.
-     *
-     * If 'strip404s' is set to true, all 404 responses will be removed.
-     *
-     * @param array $fileProperties The list with nodes
-     * @param bool strip404s
-     * @return string
-     */
-    public function generateMultiStatus(array $fileProperties, $strip404s = false) {
-
-        $dom = new \DOMDocument('1.0','utf-8');
-        //$dom->formatOutput = true;
-        $multiStatus = $dom->createElement('d:multistatus');
-        $dom->appendChild($multiStatus);
-
-        // Adding in default namespaces
-        foreach($this->xmlNamespaces as $namespace=>$prefix) {
-
-            $multiStatus->setAttribute('xmlns:' . $prefix,$namespace);
-
-        }
-
-        foreach($fileProperties as $entry) {
-
-            $href = $entry['href'];
-            unset($entry['href']);
-
-            if ($strip404s && isset($entry[404])) {
-                unset($entry[404]);
-            }
-
-            $response = new Property\Response($href,$entry);
-            $response->serialize($this,$multiStatus);
-
-        }
-
-        return $dom->saveXML();
-
-    }
-
-    /**
-     * This method parses a PropPatch request
-     *
-     * PropPatch changes the properties for a resource. This method
-     * returns a list of properties.
-     *
-     * The keys in the returned array contain the property name (e.g.: {DAV:}displayname,
-     * and the value contains the property value. If a property is to be removed the value
-     * will be null.
-     *
-     * @param string $body xml body
-     * @return array list of properties in need of updating or deletion
-     */
-    public function parsePropPatchRequest($body) {
-
-        //We'll need to change the DAV namespace declaration to something else in order to make it parsable
-        $dom = XMLUtil::loadDOMDocument($body);
-
-        $newProperties = array();
-
-        foreach($dom->firstChild->childNodes as $child) {
-
-            if ($child->nodeType !== XML_ELEMENT_NODE) continue;
-
-            $operation = XMLUtil::toClarkNotation($child);
-
-            if ($operation!=='{DAV:}set' && $operation!=='{DAV:}remove') continue;
-
-            $innerProperties = XMLUtil::parseProperties($child, $this->propertyMap);
-
-            foreach($innerProperties as $propertyName=>$propertyValue) {
-
-                if ($operation==='{DAV:}remove') {
-                    $propertyValue = null;
-                }
-
-                $newProperties[$propertyName] = $propertyValue;
-
-            }
-
-        }
-
-        return $newProperties;
-
-    }
-
-    /**
-     * This method parses the PROPFIND request and returns its information
-     *
-     * This will either be a list of properties, or an empty array; in which case
-     * an {DAV:}allprop was requested.
-     *
-     * @param string $body
-     * @return array
-     */
-    public function parsePropFindRequest($body) {
-
-        // If the propfind body was empty, it means IE is requesting 'all' properties
-        if (!$body) return array();
-
-        $dom = XMLUtil::loadDOMDocument($body);
-        $elem = $dom->getElementsByTagNameNS('urn:DAV','propfind')->item(0);
-        return array_keys(XMLUtil::parseProperties($elem));
-
-    }
-
-    // }}}
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Tree.php b/vendor/sabre/dav/lib/Sabre/DAV/Tree.php
deleted file mode 100644
index ab94168b2..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Tree.php
+++ /dev/null
@@ -1,193 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-
-/**
- * Abstract tree object
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-abstract class Tree {
-
-    /**
-     * This function must return an INode object for a path
-     * If a Path doesn't exist, thrown a Exception_NotFound
-     *
-     * @param string $path
-     * @throws Exception\NotFound
-     * @return INode
-     */
-    abstract function getNodeForPath($path);
-
-    /**
-     * This function allows you to check if a node exists.
-     *
-     * Implementors of this class should override this method to make
-     * it cheaper.
-     *
-     * @param string $path
-     * @return bool
-     */
-    public function nodeExists($path) {
-
-        try {
-
-            $this->getNodeForPath($path);
-            return true;
-
-        } catch (Exception\NotFound $e) {
-
-            return false;
-
-        }
-
-    }
-
-    /**
-     * Copies a file from path to another
-     *
-     * @param string $sourcePath The source location
-     * @param string $destinationPath The full destination path
-     * @return void
-     */
-    public function copy($sourcePath, $destinationPath) {
-
-        $sourceNode = $this->getNodeForPath($sourcePath);
-
-        // grab the dirname and basename components
-        list($destinationDir, $destinationName) = URLUtil::splitPath($destinationPath);
-
-        $destinationParent = $this->getNodeForPath($destinationDir);
-        $this->copyNode($sourceNode,$destinationParent,$destinationName);
-
-        $this->markDirty($destinationDir);
-
-    }
-
-    /**
-     * Moves a file from one location to another
-     *
-     * @param string $sourcePath The path to the file which should be moved
-     * @param string $destinationPath The full destination path, so not just the destination parent node
-     * @return int
-     */
-    public function move($sourcePath, $destinationPath) {
-
-        list($sourceDir, $sourceName) = URLUtil::splitPath($sourcePath);
-        list($destinationDir, $destinationName) = URLUtil::splitPath($destinationPath);
-
-        if ($sourceDir===$destinationDir) {
-            $renameable = $this->getNodeForPath($sourcePath);
-            $renameable->setName($destinationName);
-        } else {
-            $this->copy($sourcePath,$destinationPath);
-            $this->getNodeForPath($sourcePath)->delete();
-        }
-        $this->markDirty($sourceDir);
-        $this->markDirty($destinationDir);
-
-    }
-
-    /**
-     * Deletes a node from the tree
-     *
-     * @param string $path
-     * @return void
-     */
-    public function delete($path) {
-
-        $node = $this->getNodeForPath($path);
-        $node->delete();
-
-        list($parent) = URLUtil::splitPath($path);
-        $this->markDirty($parent);
-
-    }
-
-    /**
-     * Returns a list of childnodes for a given path.
-     *
-     * @param string $path
-     * @return array
-     */
-    public function getChildren($path) {
-
-        $node = $this->getNodeForPath($path);
-        return $node->getChildren();
-
-    }
-
-    /**
-     * This method is called with every tree update
-     *
-     * Examples of tree updates are:
-     *   * node deletions
-     *   * node creations
-     *   * copy
-     *   * move
-     *   * renaming nodes
-     *
-     * If Tree classes implement a form of caching, this will allow
-     * them to make sure caches will be expired.
-     *
-     * If a path is passed, it is assumed that the entire subtree is dirty
-     *
-     * @param string $path
-     * @return void
-     */
-    public function markDirty($path) {
-
-
-    }
-
-    /**
-     * copyNode
-     *
-     * @param INode $source
-     * @param ICollection $destinationParent
-     * @param string $destinationName
-     * @return void
-     */
-    protected function copyNode(INode $source,ICollection $destinationParent,$destinationName = null) {
-
-        if (!$destinationName) $destinationName = $source->getName();
-
-        if ($source instanceof IFile) {
-
-            $data = $source->get();
-
-            // If the body was a string, we need to convert it to a stream
-            if (is_string($data)) {
-                $stream = fopen('php://temp','r+');
-                fwrite($stream,$data);
-                rewind($stream);
-                $data = $stream;
-            }
-            $destinationParent->createFile($destinationName,$data);
-            $destination = $destinationParent->getChild($destinationName);
-
-        } elseif ($source instanceof ICollection) {
-
-            $destinationParent->createDirectory($destinationName);
-
-            $destination = $destinationParent->getChild($destinationName);
-            foreach($source->getChildren() as $child) {
-
-                $this->copyNode($child,$destination);
-
-            }
-
-        }
-        if ($source instanceof IProperties && $destination instanceof IProperties) {
-
-            $props = $source->getProperties(array());
-            $destination->updateProperties($props);
-
-        }
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/Tree/Filesystem.php b/vendor/sabre/dav/lib/Sabre/DAV/Tree/Filesystem.php
deleted file mode 100644
index a477725a5..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/Tree/Filesystem.php
+++ /dev/null
@@ -1,133 +0,0 @@
-<?php
-
-namespace Sabre\DAV\Tree;
-
-use Sabre\DAV;
-
-/**
- * FileSystem Tree
- *
- * This class is an alternative to the standard ObjectTree. This tree can only
- * use Sabre\DAV\FS\Directory and File classes, but as a result it allows for a few
- * optimizations that otherwise wouldn't be possible.
- *
- * Specifically copying and moving are much, much faster.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Filesystem extends DAV\Tree {
-
-    /**
-     * Base url on the filesystem.
-     *
-     * @var string
-     */
-    protected $basePath;
-
-    /**
-     * Creates this tree
-     *
-     * Supply the path you'd like to share.
-     *
-     * @param string $basePath
-     */
-    public function __construct($basePath) {
-
-        $this->basePath = $basePath;
-
-    }
-
-    /**
-     * Returns a new node for the given path
-     *
-     * @param string $path
-     * @return DAV\FS\Node
-     */
-    public function getNodeForPath($path) {
-
-        $realPath = $this->getRealPath($path);
-        if (!file_exists($realPath)) { 
-            throw new DAV\Exception\NotFound('File at location ' . $realPath . ' not found');
-        }
-        if (is_dir($realPath)) {
-            return new DAV\FS\Directory($realPath);
-        } else {
-            return new DAV\FS\File($realPath);
-        }
-
-    }
-
-    /**
-     * Returns the real filesystem path for a webdav url.
-     *
-     * @param string $publicPath
-     * @return string
-     */
-    protected function getRealPath($publicPath) {
-
-        return rtrim($this->basePath,'/') . '/' . trim($publicPath,'/');
-
-    }
-
-    /**
-     * Copies a file or directory.
-     *
-     * This method must work recursively and delete the destination
-     * if it exists
-     *
-     * @param string $source
-     * @param string $destination
-     * @return void
-     */
-    public function copy($source,$destination) {
-
-        $source = $this->getRealPath($source);
-        $destination = $this->getRealPath($destination);
-        $this->realCopy($source,$destination);
-
-    }
-
-    /**
-     * Used by self::copy
-     *
-     * @param string $source
-     * @param string $destination
-     * @return void
-     */
-    protected function realCopy($source,$destination) {
-
-        if (is_file($source)) {
-            copy($source,$destination);
-        } else {
-            mkdir($destination);
-            foreach(scandir($source) as $subnode) {
-
-                if ($subnode=='.' || $subnode=='..') continue;
-                $this->realCopy($source.'/'.$subnode,$destination.'/'.$subnode);
-
-            }
-        }
-
-    }
-
-    /**
-     * Moves a file or directory recursively.
-     *
-     * If the destination exists, delete it first.
-     *
-     * @param string $source
-     * @param string $destination
-     * @return void
-     */
-    public function move($source,$destination) {
-
-        $source = $this->getRealPath($source);
-        $destination = $this->getRealPath($destination);
-        rename($source,$destination);
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/URLUtil.php b/vendor/sabre/dav/lib/Sabre/DAV/URLUtil.php
deleted file mode 100644
index b7254e9a1..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/URLUtil.php
+++ /dev/null
@@ -1,124 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-
-/**
- * URL utility class
- *
- * This class provides methods to deal with encoding and decoding url (percent encoded) strings.
- *
- * It was not possible to use PHP's built-in methods for this, because some clients don't like
- * encoding of certain characters.
- *
- * Specifically, it was found that GVFS (gnome's webdav client) does not like encoding of ( and
- * ). Since these are reserved, but don't have a reserved meaning in url, these characters are
- * kept as-is.
- *
- * It was also discovered that versions of the SOGO connector for thunderbird
- * has issues with urlencoded colons.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class URLUtil {
-
-    /**
-     * Encodes the path of a url.
-     *
-     * slashes (/) are treated as path-separators.
-     *
-     * @param string $path
-     * @return string
-     */
-    static function encodePath($path) {
-
-        return preg_replace_callback('/([^A-Za-z0-9_\-\.~\(\)\/:])/',function($match) {
-
-            return '%'.sprintf('%02x',ord($match[0]));
-
-        }, $path);
-
-    }
-
-    /**
-     * Encodes a 1 segment of a path
-     *
-     * Slashes are considered part of the name, and are encoded as %2f
-     *
-     * @param string $pathSegment
-     * @return string
-     */
-    static function encodePathSegment($pathSegment) {
-
-        return preg_replace_callback('/([^A-Za-z0-9_\-\.~\(\):])/',function($match) {
-
-            return '%'.sprintf('%02x',ord($match[0]));
-
-        }, $pathSegment);
-    }
-
-    /**
-     * Decodes a url-encoded path
-     *
-     * @param string $path
-     * @return string
-     */
-    static function decodePath($path) {
-
-        return self::decodePathSegment($path);
-
-    }
-
-    /**
-     * Decodes a url-encoded path segment
-     *
-     * @param string $path
-     * @return string
-     */
-    static function decodePathSegment($path) {
-
-        $path = rawurldecode($path);
-        $encoding = mb_detect_encoding($path, array('UTF-8','ISO-8859-1'));
-
-        switch($encoding) {
-
-            case 'ISO-8859-1' :
-                $path = utf8_encode($path);
-
-        }
-
-        return $path;
-
-    }
-
-    /**
-     * Returns the 'dirname' and 'basename' for a path.
-     *
-     * The reason there is a custom function for this purpose, is because
-     * basename() is locale aware (behaviour changes if C locale or a UTF-8 locale is used)
-     * and we need a method that just operates on UTF-8 characters.
-     *
-     * In addition basename and dirname are platform aware, and will treat backslash (\) as a
-     * directory separator on windows.
-     *
-     * This method returns the 2 components as an array.
-     *
-     * If there is no dirname, it will return an empty string. Any / appearing at the end of the
-     * string is stripped off.
-     *
-     * @param string $path
-     * @return array
-     */
-    static function splitPath($path) {
-
-        $matches = array();
-        if(preg_match('/^(?:(?:(.*)(?:\/+))?([^\/]+))(?:\/?)$/u',$path,$matches)) {
-            return array($matches[1],$matches[2]);
-        } else {
-            return array(null,null);
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAV/XMLUtil.php b/vendor/sabre/dav/lib/Sabre/DAV/XMLUtil.php
deleted file mode 100644
index 2bf81b3b8..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAV/XMLUtil.php
+++ /dev/null
@@ -1,191 +0,0 @@
-<?php
-
-namespace Sabre\DAV;
-
-/**
- * XML utilities for WebDAV
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class XMLUtil {
-
-    /**
-     * Returns the 'clark notation' for an element.
-     *
-     * For example, and element encoded as:
-     * <b:myelem xmlns:b="http://www.example.org/" />
-     * will be returned as:
-     * {http://www.example.org}myelem
-     *
-     * This format is used throughout the SabreDAV sourcecode.
-     * Elements encoded with the urn:DAV namespace will
-     * be returned as if they were in the DAV: namespace. This is to avoid
-     * compatibility problems.
-     *
-     * This function will return null if a nodetype other than an Element is passed.
-     *
-     * @param \DOMNode $dom
-     * @return string
-     */
-    static function toClarkNotation(\DOMNode $dom) {
-
-        if ($dom->nodeType !== XML_ELEMENT_NODE) return null;
-
-        // Mapping back to the real namespace, in case it was dav
-        if ($dom->namespaceURI=='urn:DAV') $ns = 'DAV:'; else $ns = $dom->namespaceURI;
-
-        // Mapping to clark notation
-        return '{' . $ns . '}' . $dom->localName;
-
-    }
-
-    /**
-     * Parses a clark-notation string, and returns the namespace and element
-     * name components.
-     *
-     * If the string was invalid, it will throw an InvalidArgumentException.
-     *
-     * @param string $str
-     * @throws InvalidArgumentException
-     * @return array
-     */
-    static function parseClarkNotation($str) {
-
-        if (!preg_match('/^{([^}]*)}(.*)$/',$str,$matches)) {
-            throw new \InvalidArgumentException('\'' . $str . '\' is not a valid clark-notation formatted string');
-        }
-
-        return array(
-            $matches[1],
-            $matches[2]
-        );
-
-    }
-
-    /**
-     * This method takes an XML document (as string) and converts all instances of the
-     * DAV: namespace to urn:DAV
-     *
-     * This is unfortunately needed, because the DAV: namespace violates the xml namespaces
-     * spec, and causes the DOM to throw errors
-     *
-     * @param string $xmlDocument
-     * @return array|string|null
-     */
-    static function convertDAVNamespace($xmlDocument) {
-
-        // This is used to map the DAV: namespace to urn:DAV. This is needed, because the DAV:
-        // namespace is actually a violation of the XML namespaces specification, and will cause errors
-        return preg_replace("/xmlns(:[A-Za-z0-9_]*)?=(\"|\')DAV:(\\2)/","xmlns\\1=\\2urn:DAV\\2",$xmlDocument);
-
-    }
-
-    /**
-     * This method provides a generic way to load a DOMDocument for WebDAV use.
-     *
-     * This method throws a Sabre\DAV\Exception\BadRequest exception for any xml errors.
-     * It does not preserve whitespace, and it converts the DAV: namespace to urn:DAV.
-     *
-     * @param string $xml
-     * @throws Sabre\DAV\Exception\BadRequest
-     * @return DOMDocument
-     */
-    static function loadDOMDocument($xml) {
-
-        if (empty($xml))
-            throw new Exception\BadRequest('Empty XML document sent');
-
-        // The BitKinex client sends xml documents as UTF-16. PHP 5.3.1 (and presumably lower)
-        // does not support this, so we must intercept this and convert to UTF-8.
-        if (substr($xml,0,12) === "\x3c\x00\x3f\x00\x78\x00\x6d\x00\x6c\x00\x20\x00") {
-
-            // Note: the preceeding byte sequence is "<?xml" encoded as UTF_16, without the BOM.
-            $xml = iconv('UTF-16LE','UTF-8',$xml);
-
-            // Because the xml header might specify the encoding, we must also change this.
-            // This regex looks for the string encoding="UTF-16" and replaces it with
-            // encoding="UTF-8".
-            $xml = preg_replace('|<\?xml([^>]*)encoding="UTF-16"([^>]*)>|u','<?xml\1encoding="UTF-8"\2>',$xml);
-
-        }
-
-        // Retaining old error setting
-        $oldErrorSetting =  libxml_use_internal_errors(true);
-        // Fixes an XXE vulnerability on PHP versions older than 5.3.23 or
-        // 5.4.13.
-        $oldEntityLoaderSetting = libxml_disable_entity_loader(true);
-
-        // Clearing any previous errors
-        libxml_clear_errors();
-
-        $dom = new \DOMDocument();
-
-        // We don't generally care about any whitespace
-        $dom->preserveWhiteSpace = false;
-
-        $dom->loadXML(self::convertDAVNamespace($xml),LIBXML_NOWARNING | LIBXML_NOERROR);
-
-        if ($error = libxml_get_last_error()) {
-            libxml_clear_errors();
-            throw new Exception\BadRequest('The request body had an invalid XML body. (message: ' . $error->message . ', errorcode: ' . $error->code . ', line: ' . $error->line . ')');
-        }
-
-        // Restoring old mechanism for error handling
-        if ($oldErrorSetting===false) libxml_use_internal_errors(false);
-        if ($oldEntityLoaderSetting===false) libxml_disable_entity_loader(false);
-
-        return $dom;
-
-    }
-
-    /**
-     * Parses all WebDAV properties out of a DOM Element
-     *
-     * Generally WebDAV properties are enclosed in {DAV:}prop elements. This
-     * method helps by going through all these and pulling out the actual
-     * propertynames, making them array keys and making the property values,
-     * well.. the array values.
-     *
-     * If no value was given (self-closing element) null will be used as the
-     * value. This is used in for example PROPFIND requests.
-     *
-     * Complex values are supported through the propertyMap argument. The
-     * propertyMap should have the clark-notation properties as it's keys, and
-     * classnames as values.
-     *
-     * When any of these properties are found, the unserialize() method will be
-     * (statically) called. The result of this method is used as the value.
-     *
-     * @param \DOMElement $parentNode
-     * @param array $propertyMap
-     * @return array
-     */
-    static function parseProperties(\DOMElement $parentNode, array $propertyMap = array()) {
-
-        $propList = array();
-        foreach($parentNode->childNodes as $propNode) {
-
-            if (self::toClarkNotation($propNode)!=='{DAV:}prop') continue;
-
-            foreach($propNode->childNodes as $propNodeData) {
-
-                /* If there are no elements in here, we actually get 1 text node, this special case is dedicated to netdrive */
-                if ($propNodeData->nodeType != XML_ELEMENT_NODE) continue;
-
-                $propertyName = self::toClarkNotation($propNodeData);
-                if (isset($propertyMap[$propertyName])) {
-                    $propList[$propertyName] = call_user_func(array($propertyMap[$propertyName],'unserialize'),$propNodeData);
-                } else {
-                    $propList[$propertyName] = $propNodeData->textContent;
-                }
-            }
-
-
-        }
-        return $propList;
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalBackend/AbstractBackend.php b/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalBackend/AbstractBackend.php
deleted file mode 100644
index 984f9ad82..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalBackend/AbstractBackend.php
+++ /dev/null
@@ -1,18 +0,0 @@
-<?php
-
-namespace Sabre\DAVACL\PrincipalBackend;
-
-/**
- * Abstract Principal Backend
- *
- * Currently this class has no function. It's here for consistency and so we
- * have a non-bc-breaking way to add a default generic implementation to
- * functions we may add in the future.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-abstract class AbstractBackend implements BackendInterface {
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalBackend/PDO.php b/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalBackend/PDO.php
deleted file mode 100644
index 0921768c3..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalBackend/PDO.php
+++ /dev/null
@@ -1,428 +0,0 @@
-<?php
-
-namespace Sabre\DAVACL\PrincipalBackend;
-
-use Sabre\DAV;
-use Sabre\DAVACL;
-
-/**
- * PDO principal backend
- *
- *
- * This backend assumes all principals are in a single collection. The default collection
- * is 'principals/', but this can be overriden.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class PDO extends AbstractBackend {
-
-    /**
-     * pdo
-     *
-     * @var PDO
-     */
-    protected $pdo;
-
-    /**
-     * PDO table name for 'principals'
-     *
-     * @var string
-     */
-    protected $tableName;
-
-    /**
-     * PDO table name for 'group members'
-     *
-     * @var string
-     */
-    protected $groupMembersTableName;
-
-    /**
-     * A list of additional fields to support
-     *
-     * @var array
-     */
-    protected $fieldMap = array(
-
-        /**
-         * This property can be used to display the users' real name.
-         */
-        '{DAV:}displayname' => array(
-            'dbField' => 'displayname',
-        ),
-
-        /**
-         * This property is actually used by the CardDAV plugin, where it gets
-         * mapped to {http://calendarserver.orgi/ns/}me-card.
-         *
-         * The reason we don't straight-up use that property, is because
-         * me-card is defined as a property on the users' addressbook
-         * collection.
-         */
-        '{http://sabredav.org/ns}vcard-url' => array(
-            'dbField' => 'vcardurl',
-        ),
-        /**
-         * This is the users' primary email-address.
-         */
-        '{http://sabredav.org/ns}email-address' => array(
-            'dbField' => 'email',
-        ),
-    );
-
-    /**
-     * Sets up the backend.
-     *
-     * @param PDO $pdo
-     * @param string $tableName
-     * @param string $groupMembersTableName
-     */
-    public function __construct(\PDO $pdo, $tableName = 'principals', $groupMembersTableName = 'groupmembers') {
-
-        $this->pdo = $pdo;
-        $this->tableName = $tableName;
-        $this->groupMembersTableName = $groupMembersTableName;
-
-    }
-
-
-    /**
-     * Returns a list of principals based on a prefix.
-     *
-     * This prefix will often contain something like 'principals'. You are only
-     * expected to return principals that are in this base path.
-     *
-     * You are expected to return at least a 'uri' for every user, you can
-     * return any additional properties if you wish so. Common properties are:
-     *   {DAV:}displayname
-     *   {http://sabredav.org/ns}email-address - This is a custom SabreDAV
-     *     field that's actualy injected in a number of other properties. If
-     *     you have an email address, use this property.
-     *
-     * @param string $prefixPath
-     * @return array
-     */
-    public function getPrincipalsByPrefix($prefixPath) {
-
-        $fields = array(
-            'uri',
-        );
-
-        foreach($this->fieldMap as $key=>$value) {
-            $fields[] = $value['dbField'];
-        }
-        $result = $this->pdo->query('SELECT '.implode(',', $fields).'  FROM '. $this->tableName);
-
-        $principals = array();
-
-        while($row = $result->fetch(\PDO::FETCH_ASSOC)) {
-
-            // Checking if the principal is in the prefix
-            list($rowPrefix) = DAV\URLUtil::splitPath($row['uri']);
-            if ($rowPrefix !== $prefixPath) continue;
-
-            $principal = array(
-                'uri' => $row['uri'],
-            );
-            foreach($this->fieldMap as $key=>$value) {
-                if ($row[$value['dbField']]) {
-                    $principal[$key] = $row[$value['dbField']];
-                }
-            }
-            $principals[] = $principal;
-
-        }
-
-        return $principals;
-
-    }
-
-    /**
-     * Returns a specific principal, specified by it's path.
-     * The returned structure should be the exact same as from
-     * getPrincipalsByPrefix.
-     *
-     * @param string $path
-     * @return array
-     */
-    public function getPrincipalByPath($path) {
-
-        $fields = array(
-            'id',
-            'uri',
-        );
-
-        foreach($this->fieldMap as $key=>$value) {
-            $fields[] = $value['dbField'];
-        }
-        $stmt = $this->pdo->prepare('SELECT '.implode(',', $fields).'  FROM '. $this->tableName . ' WHERE uri = ?');
-        $stmt->execute(array($path));
-
-        $row = $stmt->fetch(\PDO::FETCH_ASSOC);
-        if (!$row) return;
-
-        $principal = array(
-            'id'  => $row['id'],
-            'uri' => $row['uri'],
-        );
-        foreach($this->fieldMap as $key=>$value) {
-            if ($row[$value['dbField']]) {
-                $principal[$key] = $row[$value['dbField']];
-            }
-        }
-        return $principal;
-
-    }
-
-    /**
-     * Updates one ore more webdav properties on a principal.
-     *
-     * The list of mutations is supplied as an array. Each key in the array is
-     * a propertyname, such as {DAV:}displayname.
-     *
-     * Each value is the actual value to be updated. If a value is null, it
-     * must be deleted.
-     *
-     * This method should be atomic. It must either completely succeed, or
-     * completely fail. Success and failure can simply be returned as 'true' or
-     * 'false'.
-     *
-     * It is also possible to return detailed failure information. In that case
-     * an array such as this should be returned:
-     *
-     * array(
-     *   200 => array(
-     *      '{DAV:}prop1' => null,
-     *   ),
-     *   201 => array(
-     *      '{DAV:}prop2' => null,
-     *   ),
-     *   403 => array(
-     *      '{DAV:}prop3' => null,
-     *   ),
-     *   424 => array(
-     *      '{DAV:}prop4' => null,
-     *   ),
-     * );
-     *
-     * In this previous example prop1 was successfully updated or deleted, and
-     * prop2 was succesfully created.
-     *
-     * prop3 failed to update due to '403 Forbidden' and because of this prop4
-     * also could not be updated with '424 Failed dependency'.
-     *
-     * This last example was actually incorrect. While 200 and 201 could appear
-     * in 1 response, if there's any error (403) the other properties should
-     * always fail with 423 (failed dependency).
-     *
-     * But anyway, if you don't want to scratch your head over this, just
-     * return true or false.
-     *
-     * @param string $path
-     * @param array $mutations
-     * @return array|bool
-     */
-    public function updatePrincipal($path, $mutations) {
-
-        $updateAble = array();
-        foreach($mutations as $key=>$value) {
-
-            // We are not aware of this field, we must fail.
-            if (!isset($this->fieldMap[$key])) {
-
-                $response = array(
-                    403 => array(
-                        $key => null,
-                    ),
-                    424 => array(),
-                );
-
-                // Adding the rest to the response as a 424
-                foreach($mutations as $subKey=>$subValue) {
-                    if ($subKey !== $key) {
-                        $response[424][$subKey] = null;
-                    }
-                }
-                return $response;
-            }
-
-            $updateAble[$this->fieldMap[$key]['dbField']] = $value;
-
-        }
-
-        // No fields to update
-        $query = "UPDATE " . $this->tableName . " SET ";
-
-        $first = true;
-        foreach($updateAble as $key => $value) {
-            if (!$first) {
-                $query.= ', ';
-            }
-            $first = false;
-            $query.= "$key = :$key ";
-        }
-        $query.='WHERE uri = :uri';
-        $stmt = $this->pdo->prepare($query);
-        $updateAble['uri'] =  $path;
-        $stmt->execute($updateAble);
-
-        return true;
-
-    }
-
-    /**
-     * This method is used to search for principals matching a set of
-     * properties.
-     *
-     * This search is specifically used by RFC3744's principal-property-search
-     * REPORT. You should at least allow searching on
-     * http://sabredav.org/ns}email-address.
-     *
-     * The actual search should be a unicode-non-case-sensitive search. The
-     * keys in searchProperties are the WebDAV property names, while the values
-     * are the property values to search on.
-     *
-     * If multiple properties are being searched on, the search should be
-     * AND'ed.
-     *
-     * This method should simply return an array with full principal uri's.
-     *
-     * If somebody attempted to search on a property the backend does not
-     * support, you should simply return 0 results.
-     *
-     * You can also just return 0 results if you choose to not support
-     * searching at all, but keep in mind that this may stop certain features
-     * from working.
-     *
-     * @param string $prefixPath
-     * @param array $searchProperties
-     * @return array
-     */
-    public function searchPrincipals($prefixPath, array $searchProperties) {
-
-        $query = 'SELECT uri FROM ' . $this->tableName . ' WHERE 1=1 ';
-        $values = array();
-        foreach($searchProperties as $property => $value) {
-
-            switch($property) {
-
-                case '{DAV:}displayname' :
-                    $query.=' AND displayname LIKE ?';
-                    $values[] = '%' . $value . '%';
-                    break;
-                case '{http://sabredav.org/ns}email-address' :
-                    $query.=' AND email LIKE ?';
-                    $values[] = '%' . $value . '%';
-                    break;
-                default :
-                    // Unsupported property
-                    return array();
-
-            }
-
-        }
-        $stmt = $this->pdo->prepare($query);
-        $stmt->execute($values);
-
-        $principals = array();
-        while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-
-            // Checking if the principal is in the prefix
-            list($rowPrefix) = DAV\URLUtil::splitPath($row['uri']);
-            if ($rowPrefix !== $prefixPath) continue;
-
-            $principals[] = $row['uri'];
-
-        }
-
-        return $principals;
-
-    }
-
-    /**
-     * Returns the list of members for a group-principal
-     *
-     * @param string $principal
-     * @return array
-     */
-    public function getGroupMemberSet($principal) {
-
-        $principal = $this->getPrincipalByPath($principal);
-        if (!$principal) throw new DAV\Exception('Principal not found');
-
-        $stmt = $this->pdo->prepare('SELECT principals.uri as uri FROM '.$this->groupMembersTableName.' AS groupmembers LEFT JOIN '.$this->tableName.' AS principals ON groupmembers.member_id = principals.id WHERE groupmembers.principal_id = ?');
-        $stmt->execute(array($principal['id']));
-
-        $result = array();
-        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-            $result[] = $row['uri'];
-        }
-        return $result;
-
-    }
-
-    /**
-     * Returns the list of groups a principal is a member of
-     *
-     * @param string $principal
-     * @return array
-     */
-    public function getGroupMembership($principal) {
-
-        $principal = $this->getPrincipalByPath($principal);
-        if (!$principal) throw new DAV\Exception('Principal not found');
-
-        $stmt = $this->pdo->prepare('SELECT principals.uri as uri FROM '.$this->groupMembersTableName.' AS groupmembers LEFT JOIN '.$this->tableName.' AS principals ON groupmembers.principal_id = principals.id WHERE groupmembers.member_id = ?');
-        $stmt->execute(array($principal['id']));
-
-        $result = array();
-        while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-            $result[] = $row['uri'];
-        }
-        return $result;
-
-    }
-
-    /**
-     * Updates the list of group members for a group principal.
-     *
-     * The principals should be passed as a list of uri's.
-     *
-     * @param string $principal
-     * @param array $members
-     * @return void
-     */
-    public function setGroupMemberSet($principal, array $members) {
-
-        // Grabbing the list of principal id's.
-        $stmt = $this->pdo->prepare('SELECT id, uri FROM '.$this->tableName.' WHERE uri IN (? ' . str_repeat(', ? ', count($members)) . ');');
-        $stmt->execute(array_merge(array($principal), $members));
-
-        $memberIds = array();
-        $principalId = null;
-
-        while($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-            if ($row['uri'] == $principal) {
-                $principalId = $row['id'];
-            } else {
-                $memberIds[] = $row['id'];
-            }
-        }
-        if (!$principalId) throw new DAV\Exception('Principal not found');
-
-        // Wiping out old members
-        $stmt = $this->pdo->prepare('DELETE FROM '.$this->groupMembersTableName.' WHERE principal_id = ?;');
-        $stmt->execute(array($principalId));
-
-        foreach($memberIds as $memberId) {
-
-            $stmt = $this->pdo->prepare('INSERT INTO '.$this->groupMembersTableName.' (principal_id, member_id) VALUES (?, ?);');
-            $stmt->execute(array($principalId, $memberId));
-
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalCollection.php b/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalCollection.php
deleted file mode 100644
index 3aadf399d..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/PrincipalCollection.php
+++ /dev/null
@@ -1,33 +0,0 @@
-<?php
-
-namespace Sabre\DAVACL;
-
-/**
- * Principals Collection
- *
- * This collection represents a list of users.
- * The users are instances of Sabre\DAVACL\Principal
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class PrincipalCollection extends AbstractPrincipalCollection {
-
-    /**
-     * This method returns a node for a principal.
-     *
-     * The passed array contains principal information, and is guaranteed to
-     * at least contain a uri item. Other properties may or may not be
-     * supplied by the authentication backend.
-     *
-     * @param array $principal
-     * @return \Sabre\DAV\INode
-     */
-    public function getChildForPrincipal(array $principal) {
-
-        return new Principal($this->principalBackend, $principal);
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/Acl.php b/vendor/sabre/dav/lib/Sabre/DAVACL/Property/Acl.php
deleted file mode 100644
index e6a70ce91..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/Acl.php
+++ /dev/null
@@ -1,211 +0,0 @@
-<?php
-
-namespace Sabre\DAVACL\Property;
-
-use Sabre\DAV;
-
-/**
- * This class represents the {DAV:}acl property
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Acl extends DAV\Property {
-
-    /**
-     * List of privileges
-     *
-     * @var array
-     */
-    private $privileges;
-
-    /**
-     * Whether or not the server base url is required to be prefixed when
-     * serializing the property.
-     *
-     * @var boolean
-     */
-    private $prefixBaseUrl;
-
-    /**
-     * Constructor
-     *
-     * This object requires a structure similar to the return value from
-     * Sabre\DAVACL\Plugin::getACL().
-     *
-     * Each privilege is a an array with at least a 'privilege' property, and a
-     * 'principal' property. A privilege may have a 'protected' property as
-     * well.
-     *
-     * The prefixBaseUrl should be set to false, if the supplied principal urls
-     * are already full urls. If this is kept to true, the servers base url
-     * will automatically be prefixed.
-     *
-     * @param bool $prefixBaseUrl
-     * @param array $privileges
-     */
-    public function __construct(array $privileges, $prefixBaseUrl = true) {
-
-        $this->privileges = $privileges;
-        $this->prefixBaseUrl = $prefixBaseUrl;
-
-    }
-
-    /**
-     * Returns the list of privileges for this property
-     *
-     * @return array
-     */
-    public function getPrivileges() {
-
-        return $this->privileges;
-
-    }
-
-    /**
-     * Serializes the property into a DOMElement
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $node) {
-
-        $doc = $node->ownerDocument;
-        foreach($this->privileges as $ace) {
-
-            $this->serializeAce($doc, $node, $ace, $server);
-
-        }
-
-    }
-
-    /**
-     * Unserializes the {DAV:}acl xml element.
-     *
-     * @param \DOMElement $dom
-     * @return Acl
-     */
-    static public function unserialize(\DOMElement $dom) {
-
-        $privileges = array();
-        $xaces = $dom->getElementsByTagNameNS('urn:DAV','ace');
-        for($ii=0; $ii < $xaces->length; $ii++) {
-
-            $xace = $xaces->item($ii);
-            $principal = $xace->getElementsByTagNameNS('urn:DAV','principal');
-            if ($principal->length !== 1) {
-                throw new DAV\Exception\BadRequest('Each {DAV:}ace element must have one {DAV:}principal element');
-            }
-            $principal = Principal::unserialize($principal->item(0));
-
-            switch($principal->getType()) {
-                case Principal::HREF :
-                    $principal = $principal->getHref();
-                    break;
-                case Principal::AUTHENTICATED :
-                    $principal = '{DAV:}authenticated';
-                    break;
-                case Principal::UNAUTHENTICATED :
-                    $principal = '{DAV:}unauthenticated';
-                    break;
-                case Principal::ALL :
-                    $principal = '{DAV:}all';
-                    break;
-
-            }
-
-            $protected = false;
-
-            if ($xace->getElementsByTagNameNS('urn:DAV','protected')->length > 0) {
-                $protected = true;
-            }
-
-            $grants = $xace->getElementsByTagNameNS('urn:DAV','grant');
-            if ($grants->length < 1) {
-                throw new DAV\Exception\NotImplemented('Every {DAV:}ace element must have a {DAV:}grant element. {DAV:}deny is not yet supported');
-            }
-            $grant = $grants->item(0);
-
-            $xprivs = $grant->getElementsByTagNameNS('urn:DAV','privilege');
-            for($jj=0; $jj<$xprivs->length; $jj++) {
-
-                $xpriv = $xprivs->item($jj);
-
-                $privilegeName = null;
-
-                for ($kk=0;$kk<$xpriv->childNodes->length;$kk++) {
-
-                    $childNode = $xpriv->childNodes->item($kk);
-                    if ($t = DAV\XMLUtil::toClarkNotation($childNode)) {
-                        $privilegeName = $t;
-                        break;
-                    }
-                }
-                if (is_null($privilegeName)) {
-                    throw new DAV\Exception\BadRequest('{DAV:}privilege elements must have a privilege element contained within them.');
-                }
-
-                $privileges[] = array(
-                    'principal' => $principal,
-                    'protected' => $protected,
-                    'privilege' => $privilegeName,
-                );
-
-            }
-
-        }
-
-        return new self($privileges);
-
-    }
-
-    /**
-     * Serializes a single access control entry.
-     *
-     * @param \DOMDocument $doc
-     * @param \DOMElement $node
-     * @param array $ace
-     * @param DAV\Server $server
-     * @return void
-     */
-    private function serializeAce($doc,$node,$ace, DAV\Server $server) {
-
-        $xace  = $doc->createElementNS('DAV:','d:ace');
-        $node->appendChild($xace);
-
-        $principal = $doc->createElementNS('DAV:','d:principal');
-        $xace->appendChild($principal);
-        switch($ace['principal']) {
-            case '{DAV:}authenticated' :
-                $principal->appendChild($doc->createElementNS('DAV:','d:authenticated'));
-                break;
-            case '{DAV:}unauthenticated' :
-                $principal->appendChild($doc->createElementNS('DAV:','d:unauthenticated'));
-                break;
-            case '{DAV:}all' :
-                $principal->appendChild($doc->createElementNS('DAV:','d:all'));
-                break;
-            default:
-                $principal->appendChild($doc->createElementNS('DAV:','d:href',($this->prefixBaseUrl?$server->getBaseUri():'') . $ace['principal'] . '/'));
-        }
-
-        $grant = $doc->createElementNS('DAV:','d:grant');
-        $xace->appendChild($grant);
-
-        $privParts = null;
-
-        preg_match('/^{([^}]*)}(.*)$/',$ace['privilege'],$privParts);
-
-        $xprivilege = $doc->createElementNS('DAV:','d:privilege');
-        $grant->appendChild($xprivilege);
-
-        $xprivilege->appendChild($doc->createElementNS($privParts[1],'d:'.$privParts[2]));
-
-        if (isset($ace['protected']) && $ace['protected'])
-            $xace->appendChild($doc->createElement('d:protected'));
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/AclRestrictions.php b/vendor/sabre/dav/lib/Sabre/DAVACL/Property/AclRestrictions.php
deleted file mode 100644
index aa6fd17d6..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/AclRestrictions.php
+++ /dev/null
@@ -1,34 +0,0 @@
-<?php
-
-namespace Sabre\DAVACL\Property;
-
-use Sabre\DAV;
-
-/**
- * AclRestrictions property
- *
- * This property represents {DAV:}acl-restrictions, as defined in RFC3744.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class AclRestrictions extends DAV\Property {
-
-    /**
-     * Serializes the property into a DOMElement
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $elem
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $elem) {
-
-        $doc = $elem->ownerDocument;
-
-        $elem->appendChild($doc->createElementNS('DAV:','d:grant-only'));
-        $elem->appendChild($doc->createElementNS('DAV:','d:no-invert'));
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/CurrentUserPrivilegeSet.php b/vendor/sabre/dav/lib/Sabre/DAVACL/Property/CurrentUserPrivilegeSet.php
deleted file mode 100644
index e0501dbd6..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/CurrentUserPrivilegeSet.php
+++ /dev/null
@@ -1,124 +0,0 @@
-<?php
-
-namespace Sabre\DAVACL\Property;
-
-use Sabre\DAV;
-
-/**
- * CurrentUserPrivilegeSet
- *
- * This class represents the current-user-privilege-set property. When
- * requested, it contain all the privileges a user has on a specific node.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class CurrentUserPrivilegeSet extends DAV\Property {
-
-    /**
-     * List of privileges
-     *
-     * @var array
-     */
-    private $privileges;
-
-    /**
-     * Creates the object
-     *
-     * Pass the privileges in clark-notation
-     *
-     * @param array $privileges
-     */
-    public function __construct(array $privileges) {
-
-        $this->privileges = $privileges;
-
-    }
-
-    /**
-     * Serializes the property in the DOM
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $node) {
-
-        $doc = $node->ownerDocument;
-        foreach($this->privileges as $privName) {
-
-            $this->serializePriv($doc,$node,$privName);
-
-        }
-
-    }
-
-    /**
-     * Returns true or false, whether the specified principal appears in the
-     * list.
-     *
-     * @return bool
-     */
-    public function has($privilegeName) {
-
-        return in_array($privilegeName, $this->privileges);
-
-    }
-
-    /**
-     * Serializes one privilege
-     *
-     * @param \DOMDocument $doc
-     * @param \DOMElement $node
-     * @param string $privName
-     * @return void
-     */
-    protected function serializePriv($doc,$node,$privName) {
-
-        $xp  = $doc->createElementNS('DAV:','d:privilege');
-        $node->appendChild($xp);
-
-        $privParts = null;
-        preg_match('/^{([^}]*)}(.*)$/',$privName,$privParts);
-
-        $xp->appendChild($doc->createElementNS($privParts[1],'d:'.$privParts[2]));
-
-    }
-
-    /**
-     * Unserializes the {DAV:}current-user-privilege-set element.
-     *
-     * @param DOMElement $node
-     * @return CurrentUserPrivilegeSet
-     */
-    static public function unserialize(\DOMElement $node) {
-
-        $result = array();
-
-        $xprivs = $node->getElementsByTagNameNS('urn:DAV','privilege');
-
-        for($jj=0; $jj<$xprivs->length; $jj++) {
-
-            $xpriv = $xprivs->item($jj);
-
-            $privilegeName = null;
-
-            for ($kk=0;$kk<$xpriv->childNodes->length;$kk++) {
-
-                $childNode = $xpriv->childNodes->item($kk);
-                if ($t = DAV\XMLUtil::toClarkNotation($childNode)) {
-                    $privilegeName = $t;
-                    break;
-                }
-            }
-
-            $result[] = $privilegeName;
-
-        }
-
-        return new self($result);
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/Principal.php b/vendor/sabre/dav/lib/Sabre/DAVACL/Property/Principal.php
deleted file mode 100644
index 6c644b024..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/Principal.php
+++ /dev/null
@@ -1,161 +0,0 @@
-<?php
-
-namespace Sabre\DAVACL\Property;
-use Sabre\DAV;
-
-/**
- * Principal property
- *
- * The principal property represents a principal from RFC3744 (ACL).
- * The property can be used to specify a principal or pseudo principals.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Principal extends DAV\Property implements DAV\Property\IHref {
-
-    /**
-     * To specify a not-logged-in user, use the UNAUTHENTICATED principal
-     */
-    const UNAUTHENTICATED = 1;
-
-    /**
-     * To specify any principal that is logged in, use AUTHENTICATED
-     */
-    const AUTHENTICATED = 2;
-
-    /**
-     * Specific principals can be specified with the HREF
-     */
-    const HREF = 3;
-
-    /**
-     * Everybody, basically
-     */
-    const ALL = 4;
-
-    /**
-     * Principal-type
-     *
-     * Must be one of the UNAUTHENTICATED, AUTHENTICATED or HREF constants.
-     *
-     * @var int
-     */
-    private $type;
-
-    /**
-     * Url to principal
-     *
-     * This value is only used for the HREF principal type.
-     *
-     * @var string
-     */
-    private $href;
-
-    /**
-     * Creates the property.
-     *
-     * The 'type' argument must be one of the type constants defined in this class.
-     *
-     * 'href' is only required for the HREF type.
-     *
-     * @param int $type
-     * @param string|null $href
-     */
-    public function __construct($type, $href = null) {
-
-        $this->type = $type;
-
-        if ($type===self::HREF && is_null($href)) {
-            throw new DAV\Exception('The href argument must be specified for the HREF principal type.');
-        }
-        $this->href = $href;
-
-    }
-
-    /**
-     * Returns the principal type
-     *
-     * @return int
-     */
-    public function getType() {
-
-        return $this->type;
-
-    }
-
-    /**
-     * Returns the principal uri.
-     *
-     * @return string
-     */
-    public function getHref() {
-
-        return $this->href;
-
-    }
-
-    /**
-     * Serializes the property into a DOMElement.
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server, \DOMElement $node) {
-
-        $prefix = $server->xmlNamespaces['DAV:'];
-        switch($this->type) {
-
-            case self::UNAUTHENTICATED :
-                $node->appendChild(
-                    $node->ownerDocument->createElement($prefix . ':unauthenticated')
-                );
-                break;
-            case self::AUTHENTICATED :
-                $node->appendChild(
-                    $node->ownerDocument->createElement($prefix . ':authenticated')
-                );
-                break;
-            case self::HREF :
-                $href = $node->ownerDocument->createElement($prefix . ':href');
-                $href->nodeValue = $server->getBaseUri() . DAV\URLUtil::encodePath($this->href);
-                $node->appendChild($href);
-                break;
-
-        }
-
-    }
-
-    /**
-     * Deserializes a DOM element into a property object.
-     *
-     * @param \DOMElement $dom
-     * @return Principal
-     */
-    static public function unserialize(\DOMElement $dom) {
-
-        $parent = $dom->firstChild;
-        while(!DAV\XMLUtil::toClarkNotation($parent)) {
-            $parent = $parent->nextSibling;
-        }
-
-        switch(DAV\XMLUtil::toClarkNotation($parent)) {
-
-            case '{DAV:}unauthenticated' :
-                return new self(self::UNAUTHENTICATED);
-            case '{DAV:}authenticated' :
-                return new self(self::AUTHENTICATED);
-            case '{DAV:}href':
-                return new self(self::HREF, $parent->textContent);
-            case '{DAV:}all':
-                return new self(self::ALL);
-            default :
-                throw new DAV\Exception\BadRequest('Unexpected element (' . DAV\XMLUtil::toClarkNotation($parent) . '). Could not deserialize');
-
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/SupportedPrivilegeSet.php b/vendor/sabre/dav/lib/Sabre/DAVACL/Property/SupportedPrivilegeSet.php
deleted file mode 100644
index 5f152d9e5..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Property/SupportedPrivilegeSet.php
+++ /dev/null
@@ -1,94 +0,0 @@
-<?php
-
-namespace Sabre\DAVACL\Property;
-
-use Sabre\DAV;
-
-/**
- * SupportedPrivilegeSet property
- *
- * This property encodes the {DAV:}supported-privilege-set property, as defined
- * in rfc3744. Please consult the rfc for details about it's structure.
- *
- * This class expects a structure like the one given from
- * Sabre\DAVACL\Plugin::getSupportedPrivilegeSet as the argument in its
- * constructor.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class SupportedPrivilegeSet extends DAV\Property {
-
-    /**
-     * privileges
-     *
-     * @var array
-     */
-    private $privileges;
-
-    /**
-     * Constructor
-     *
-     * @param array $privileges
-     */
-    public function __construct(array $privileges) {
-
-        $this->privileges = $privileges;
-
-    }
-
-    /**
-     * Serializes the property into a domdocument.
-     *
-     * @param DAV\Server $server
-     * @param \DOMElement $node
-     * @return void
-     */
-    public function serialize(DAV\Server $server,\DOMElement $node) {
-
-        $doc = $node->ownerDocument;
-        $this->serializePriv($doc, $node, $this->privileges);
-
-    }
-
-    /**
-     * Serializes a property
-     *
-     * This is a recursive function.
-     *
-     * @param \DOMDocument $doc
-     * @param \DOMElement $node
-     * @param array $privilege
-     * @return void
-     */
-    private function serializePriv($doc,$node,$privilege) {
-
-        $xsp = $doc->createElementNS('DAV:','d:supported-privilege');
-        $node->appendChild($xsp);
-
-        $xp  = $doc->createElementNS('DAV:','d:privilege');
-        $xsp->appendChild($xp);
-
-        $privParts = null;
-        preg_match('/^{([^}]*)}(.*)$/',$privilege['privilege'],$privParts);
-
-        $xp->appendChild($doc->createElementNS($privParts[1],'d:'.$privParts[2]));
-
-        if (isset($privilege['abstract']) && $privilege['abstract']) {
-            $xsp->appendChild($doc->createElementNS('DAV:','d:abstract'));
-        }
-
-        if (isset($privilege['description'])) {
-            $xsp->appendChild($doc->createElementNS('DAV:','d:description',$privilege['description']));
-        }
-
-        if (isset($privilege['aggregates'])) {
-            foreach($privilege['aggregates'] as $subPrivilege) {
-                $this->serializePriv($doc,$xsp,$subPrivilege);
-            }
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/DAVACL/Version.php b/vendor/sabre/dav/lib/Sabre/DAVACL/Version.php
deleted file mode 100644
index 344e22d7b..000000000
--- a/vendor/sabre/dav/lib/Sabre/DAVACL/Version.php
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-
-namespace Sabre\DAVACL;
-
-/**
- * This class contains the SabreDAV version constants.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Version {
-
-    /**
-     * Full version number
-     */
-    const VERSION = '1.8.7';
-
-    /**
-     * Stability : alpha, beta, stable
-     */
-    const STABILITY = 'stable';
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/HTTP/AWSAuth.php b/vendor/sabre/dav/lib/Sabre/HTTP/AWSAuth.php
deleted file mode 100644
index 603470fb4..000000000
--- a/vendor/sabre/dav/lib/Sabre/HTTP/AWSAuth.php
+++ /dev/null
@@ -1,227 +0,0 @@
-<?php
-
-namespace Sabre\HTTP;
-
-/**
- * HTTP AWS Authentication handler
- *
- * Use this class to leverage amazon's AWS authentication header
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class AWSAuth extends AbstractAuth {
-
-    /**
-     * The signature supplied by the HTTP client
-     *
-     * @var string
-     */
-    private $signature = null;
-
-    /**
-     * The accesskey supplied by the HTTP client
-     *
-     * @var string
-     */
-    private $accessKey = null;
-
-    /**
-     * An error code, if any
-     *
-     * This value will be filled with one of the ERR_* constants
-     *
-     * @var int
-     */
-    public $errorCode = 0;
-
-    const ERR_NOAWSHEADER = 1;
-    const ERR_MD5CHECKSUMWRONG = 2;
-    const ERR_INVALIDDATEFORMAT = 3;
-    const ERR_REQUESTTIMESKEWED = 4;
-    const ERR_INVALIDSIGNATURE = 5;
-
-    /**
-     * Gathers all information from the headers
-     *
-     * This method needs to be called prior to anything else.
-     *
-     * @return bool
-     */
-    public function init() {
-
-        $authHeader = $this->httpRequest->getHeader('Authorization');
-        $authHeader = explode(' ',$authHeader);
-
-        if ($authHeader[0]!='AWS' || !isset($authHeader[1])) {
-            $this->errorCode = self::ERR_NOAWSHEADER;
-             return false;
-        }
-
-        list($this->accessKey,$this->signature) = explode(':',$authHeader[1]);
-
-        return true;
-
-    }
-
-    /**
-     * Returns the username for the request
-     *
-     * @return string
-     */
-    public function getAccessKey() {
-
-        return $this->accessKey;
-
-    }
-
-    /**
-     * Validates the signature based on the secretKey
-     *
-     * @param string $secretKey
-     * @return bool
-     */
-    public function validate($secretKey) {
-
-        $contentMD5 = $this->httpRequest->getHeader('Content-MD5');
-
-        if ($contentMD5) {
-            // We need to validate the integrity of the request
-            $body = $this->httpRequest->getBody(true);
-            $this->httpRequest->setBody($body,true);
-
-            if ($contentMD5!=base64_encode(md5($body,true))) {
-                // content-md5 header did not match md5 signature of body
-                $this->errorCode = self::ERR_MD5CHECKSUMWRONG;
-                return false;
-            }
-
-        }
-
-        if (!$requestDate = $this->httpRequest->getHeader('x-amz-date'))
-            $requestDate = $this->httpRequest->getHeader('Date');
-
-        if (!$this->validateRFC2616Date($requestDate))
-            return false;
-
-        $amzHeaders = $this->getAmzHeaders();
-
-        $signature = base64_encode(
-            $this->hmacsha1($secretKey,
-                $this->httpRequest->getMethod() . "\n" .
-                $contentMD5 . "\n" .
-                $this->httpRequest->getHeader('Content-type') . "\n" .
-                $requestDate . "\n" .
-                $amzHeaders .
-                $this->httpRequest->getURI()
-            )
-        );
-
-        if ($this->signature != $signature) {
-
-            $this->errorCode = self::ERR_INVALIDSIGNATURE;
-            return false;
-
-        }
-
-        return true;
-
-    }
-
-
-    /**
-     * Returns an HTTP 401 header, forcing login
-     *
-     * This should be called when username and password are incorrect, or not supplied at all
-     *
-     * @return void
-     */
-    public function requireLogin() {
-
-        $this->httpResponse->setHeader('WWW-Authenticate','AWS');
-        $this->httpResponse->sendStatus(401);
-
-    }
-
-    /**
-     * Makes sure the supplied value is a valid RFC2616 date.
-     *
-     * If we would just use strtotime to get a valid timestamp, we have no way of checking if a
-     * user just supplied the word 'now' for the date header.
-     *
-     * This function also makes sure the Date header is within 15 minutes of the operating
-     * system date, to prevent replay attacks.
-     *
-     * @param string $dateHeader
-     * @return bool
-     */
-    protected function validateRFC2616Date($dateHeader) {
-
-        $date = Util::parseHTTPDate($dateHeader);
-
-        // Unknown format
-        if (!$date) {
-            $this->errorCode = self::ERR_INVALIDDATEFORMAT;
-            return false;
-        }
-
-        $min = new \DateTime('-15 minutes');
-        $max = new \DateTime('+15 minutes');
-
-        // We allow 15 minutes around the current date/time
-        if ($date > $max || $date < $min) {
-            $this->errorCode = self::ERR_REQUESTTIMESKEWED;
-            return false;
-        }
-
-        return $date;
-
-    }
-
-    /**
-     * Returns a list of AMZ headers
-     *
-     * @return string
-     */
-    protected function getAmzHeaders() {
-
-        $amzHeaders = array();
-        $headers = $this->httpRequest->getHeaders();
-        foreach($headers as $headerName => $headerValue) {
-            if (strpos(strtolower($headerName),'x-amz-')===0) {
-                $amzHeaders[strtolower($headerName)] = str_replace(array("\r\n"),array(' '),$headerValue) . "\n";
-            }
-        }
-        ksort($amzHeaders);
-
-        $headerStr = '';
-        foreach($amzHeaders as $h=>$v) {
-            $headerStr.=$h.':'.$v;
-        }
-
-        return $headerStr;
-
-    }
-
-    /**
-     * Generates an HMAC-SHA1 signature
-     *
-     * @param string $key
-     * @param string $message
-     * @return string
-     */
-    private function hmacsha1($key, $message) {
-
-        $blocksize=64;
-        if (strlen($key)>$blocksize)
-            $key=pack('H*', sha1($key));
-        $key=str_pad($key,$blocksize,chr(0x00));
-        $ipad=str_repeat(chr(0x36),$blocksize);
-        $opad=str_repeat(chr(0x5c),$blocksize);
-        $hmac = pack('H*',sha1(($key^$opad).pack('H*',sha1(($key^$ipad).$message))));
-        return $hmac;
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/HTTP/AbstractAuth.php b/vendor/sabre/dav/lib/Sabre/HTTP/AbstractAuth.php
deleted file mode 100644
index 1ddf412b7..000000000
--- a/vendor/sabre/dav/lib/Sabre/HTTP/AbstractAuth.php
+++ /dev/null
@@ -1,111 +0,0 @@
-<?php
-
-namespace Sabre\HTTP;
-
-/**
- * HTTP Authentication baseclass
- *
- * This class has the common functionality for BasicAuth and DigestAuth
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-abstract class AbstractAuth {
-
-    /**
-     * The realm will be displayed in the dialog boxes
-     *
-     * This identifier can be changed through setRealm()
-     *
-     * @var string
-     */
-    protected $realm = 'SabreDAV';
-
-    /**
-     * HTTP response helper
-     *
-     * @var Sabre\HTTP\Response
-     */
-    protected $httpResponse;
-
-
-    /**
-     * HTTP request helper
-     *
-     * @var Sabre\HTTP\Request
-     */
-    protected $httpRequest;
-
-    /**
-     * __construct
-     *
-     */
-    public function __construct() {
-
-        $this->httpResponse = new Response();
-        $this->httpRequest = new Request();
-
-    }
-
-    /**
-     * Sets an alternative HTTP response object
-     *
-     * @param Response $response
-     * @return void
-     */
-    public function setHTTPResponse(Response $response) {
-
-        $this->httpResponse = $response;
-
-    }
-
-    /**
-     * Sets an alternative HTTP request object
-     *
-     * @param Request $request
-     * @return void
-     */
-    public function setHTTPRequest(Request $request) {
-
-        $this->httpRequest = $request;
-
-    }
-
-
-    /**
-     * Sets the realm
-     *
-     * The realm is often displayed in authentication dialog boxes
-     * Commonly an application name displayed here
-     *
-     * @param string $realm
-     * @return void
-     */
-    public function setRealm($realm) {
-
-        $this->realm = $realm;
-
-    }
-
-    /**
-     * Returns the realm
-     *
-     * @return string
-     */
-    public function getRealm() {
-
-        return $this->realm;
-
-    }
-
-    /**
-     * Returns an HTTP 401 header, forcing login
-     *
-     * This should be called when username and password are incorrect, or not supplied at all
-     *
-     * @return void
-     */
-    abstract public function requireLogin();
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/HTTP/BasicAuth.php b/vendor/sabre/dav/lib/Sabre/HTTP/BasicAuth.php
deleted file mode 100644
index 659964faa..000000000
--- a/vendor/sabre/dav/lib/Sabre/HTTP/BasicAuth.php
+++ /dev/null
@@ -1,67 +0,0 @@
-<?php
-
-namespace Sabre\HTTP;
-
-/**
- * HTTP Basic Authentication handler
- *
- * Use this class for easy http authentication setup
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class BasicAuth extends AbstractAuth {
-
-    /**
-     * Returns the supplied username and password.
-     *
-     * The returned array has two values:
-     *   * 0 - username
-     *   * 1 - password
-     *
-     * If nothing was supplied, 'false' will be returned
-     *
-     * @return mixed
-     */
-    public function getUserPass() {
-
-        // Apache and mod_php
-        if (($user = $this->httpRequest->getRawServerValue('PHP_AUTH_USER')) && ($pass = $this->httpRequest->getRawServerValue('PHP_AUTH_PW'))) {
-
-            return array($user,$pass);
-
-        }
-
-        // Most other webservers
-        $auth = $this->httpRequest->getHeader('Authorization');
-
-        // Apache could prefix environment variables with REDIRECT_ when urls
-        // are passed through mod_rewrite
-        if (!$auth) {
-            $auth = $this->httpRequest->getRawServerValue('REDIRECT_HTTP_AUTHORIZATION');
-        }
-
-        if (!$auth) return false;
-
-        if (strpos(strtolower($auth),'basic')!==0) return false;
-
-        return explode(':', base64_decode(substr($auth, 6)),2);
-
-    }
-
-    /**
-     * Returns an HTTP 401 header, forcing login
-     *
-     * This should be called when username and password are incorrect, or not supplied at all
-     *
-     * @return void
-     */
-    public function requireLogin() {
-
-        $this->httpResponse->setHeader('WWW-Authenticate','Basic realm="' . $this->realm . '"');
-        $this->httpResponse->sendStatus(401);
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/HTTP/DigestAuth.php b/vendor/sabre/dav/lib/Sabre/HTTP/DigestAuth.php
deleted file mode 100644
index aae6d84d6..000000000
--- a/vendor/sabre/dav/lib/Sabre/HTTP/DigestAuth.php
+++ /dev/null
@@ -1,240 +0,0 @@
-<?php
-
-namespace Sabre\HTTP;
-
-/**
- * HTTP Digest Authentication handler
- *
- * Use this class for easy http digest authentication.
- * Instructions:
- *
- *  1. Create the object
- *  2. Call the setRealm() method with the realm you plan to use
- *  3. Call the init method function.
- *  4. Call the getUserName() function. This function may return false if no
- *     authentication information was supplied. Based on the username you
- *     should check your internal database for either the associated password,
- *     or the so-called A1 hash of the digest.
- *  5. Call either validatePassword() or validateA1(). This will return true
- *     or false.
- *  6. To make sure an authentication prompt is displayed, call the
- *     requireLogin() method.
- *
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class DigestAuth extends AbstractAuth {
-
-    /**
-     * These constants are used in setQOP();
-     */
-    const QOP_AUTH = 1;
-    const QOP_AUTHINT = 2;
-
-    protected $nonce;
-    protected $opaque;
-    protected $digestParts;
-    protected $A1;
-    protected $qop = self::QOP_AUTH;
-
-    /**
-     * Initializes the object
-     */
-    public function __construct() {
-
-        $this->nonce = uniqid();
-        $this->opaque = md5($this->realm);
-        parent::__construct();
-
-    }
-
-    /**
-     * Gathers all information from the headers
-     *
-     * This method needs to be called prior to anything else.
-     *
-     * @return void
-     */
-    public function init() {
-
-        $digest = $this->getDigest();
-        $this->digestParts = $this->parseDigest($digest);
-
-    }
-
-    /**
-     * Sets the quality of protection value.
-     *
-     * Possible values are:
-     *   Sabre\HTTP\DigestAuth::QOP_AUTH
-     *   Sabre\HTTP\DigestAuth::QOP_AUTHINT
-     *
-     * Multiple values can be specified using logical OR.
-     *
-     * QOP_AUTHINT ensures integrity of the request body, but this is not
-     * supported by most HTTP clients. QOP_AUTHINT also requires the entire
-     * request body to be md5'ed, which can put strains on CPU and memory.
-     *
-     * @param int $qop
-     * @return void
-     */
-    public function setQOP($qop) {
-
-        $this->qop = $qop;
-
-    }
-
-    /**
-     * Validates the user.
-     *
-     * The A1 parameter should be md5($username . ':' . $realm . ':' . $password);
-     *
-     * @param string $A1
-     * @return bool
-     */
-    public function validateA1($A1) {
-
-        $this->A1 = $A1;
-        return $this->validate();
-
-    }
-
-    /**
-     * Validates authentication through a password. The actual password must be provided here.
-     * It is strongly recommended not store the password in plain-text and use validateA1 instead.
-     *
-     * @param string $password
-     * @return bool
-     */
-    public function validatePassword($password) {
-
-        $this->A1 = md5($this->digestParts['username'] . ':' . $this->realm . ':' . $password);
-        return $this->validate();
-
-    }
-
-    /**
-     * Returns the username for the request
-     *
-     * @return string
-     */
-    public function getUsername() {
-
-        return $this->digestParts['username'];
-
-    }
-
-    /**
-     * Validates the digest challenge
-     *
-     * @return bool
-     */
-    protected function validate() {
-
-        $A2 = $this->httpRequest->getMethod() . ':' . $this->digestParts['uri'];
-
-        if ($this->digestParts['qop']=='auth-int') {
-            // Making sure we support this qop value
-            if (!($this->qop & self::QOP_AUTHINT)) return false;
-            // We need to add an md5 of the entire request body to the A2 part of the hash
-            $body = $this->httpRequest->getBody(true);
-            $this->httpRequest->setBody($body,true);
-            $A2 .= ':' . md5($body);
-        } else {
-
-            // We need to make sure we support this qop value
-            if (!($this->qop & self::QOP_AUTH)) return false;
-        }
-
-        $A2 = md5($A2);
-
-        $validResponse = md5("{$this->A1}:{$this->digestParts['nonce']}:{$this->digestParts['nc']}:{$this->digestParts['cnonce']}:{$this->digestParts['qop']}:{$A2}");
-
-        return $this->digestParts['response']==$validResponse;
-
-
-    }
-
-    /**
-     * Returns an HTTP 401 header, forcing login
-     *
-     * This should be called when username and password are incorrect, or not supplied at all
-     *
-     * @return void
-     */
-    public function requireLogin() {
-
-        $qop = '';
-        switch($this->qop) {
-            case self::QOP_AUTH    : $qop = 'auth'; break;
-            case self::QOP_AUTHINT : $qop = 'auth-int'; break;
-            case self::QOP_AUTH | self::QOP_AUTHINT : $qop = 'auth,auth-int'; break;
-        }
-
-        $this->httpResponse->setHeader('WWW-Authenticate','Digest realm="' . $this->realm . '",qop="'.$qop.'",nonce="' . $this->nonce . '",opaque="' . $this->opaque . '"');
-        $this->httpResponse->sendStatus(401);
-
-    }
-
-
-    /**
-     * This method returns the full digest string.
-     *
-     * It should be compatibile with mod_php format and other webservers.
-     *
-     * If the header could not be found, null will be returned
-     *
-     * @return mixed
-     */
-    public function getDigest() {
-
-        // mod_php
-        $digest = $this->httpRequest->getRawServerValue('PHP_AUTH_DIGEST');
-        if ($digest) return $digest;
-
-        // most other servers
-        $digest = $this->httpRequest->getHeader('Authorization');
-
-        // Apache could prefix environment variables with REDIRECT_ when urls
-        // are passed through mod_rewrite
-        if (!$digest) {
-            $digest = $this->httpRequest->getRawServerValue('REDIRECT_HTTP_AUTHORIZATION');
-        }
-
-        if ($digest && strpos(strtolower($digest),'digest')===0) {
-            return substr($digest,7);
-        } else {
-            return null;
-        }
-
-    }
-
-
-    /**
-     * Parses the different pieces of the digest string into an array.
-     *
-     * This method returns false if an incomplete digest was supplied
-     *
-     * @param string $digest
-     * @return mixed
-     */
-    protected function parseDigest($digest) {
-
-        // protect against missing data
-        $needed_parts = array('nonce'=>1, 'nc'=>1, 'cnonce'=>1, 'qop'=>1, 'username'=>1, 'uri'=>1, 'response'=>1);
-        $data = array();
-
-        preg_match_all('@(\w+)=(?:(?:")([^"]+)"|([^\s,$]+))@', $digest, $matches, PREG_SET_ORDER);
-
-        foreach ($matches as $m) {
-            $data[$m[1]] = $m[2] ? $m[2] : $m[3];
-            unset($needed_parts[$m[1]]);
-        }
-
-        return $needed_parts ? false : $data;
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/HTTP/Request.php b/vendor/sabre/dav/lib/Sabre/HTTP/Request.php
deleted file mode 100644
index a71a52b42..000000000
--- a/vendor/sabre/dav/lib/Sabre/HTTP/Request.php
+++ /dev/null
@@ -1,284 +0,0 @@
-<?php
-
-namespace Sabre\HTTP;
-
-/**
- * HTTP Request information
- *
- * This object can be used to easily access information about an HTTP request.
- * It can additionally be used to create 'mock' requests.
- *
- * This class mostly operates independent, but because of the nature of a single
- * request per run it can operate as a singleton. For more information check out
- * the behaviour around 'defaultInputStream'.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Request {
-
-    /**
-     * PHP's $_SERVER data
-     *
-     * @var array
-     */
-    protected $_SERVER;
-
-    /**
-     * PHP's $_POST data
-     *
-     * @var array
-     */
-    protected $_POST;
-
-    /**
-     * The request body, if any.
-     *
-     * This is stored in the form of a stream resource.
-     *
-     * @var resource
-     */
-    protected $body = null;
-
-    /**
-     * This will be set as the 'default' inputStream for a specific HTTP request
-     * We sometimes need to retain, or rebuild this if we need multiple runs
-     * of parsing the original HTTP request.
-     *
-     * @var resource
-     */
-    static $defaultInputStream=null;
-
-    /**
-     * Sets up the object
-     *
-     * The serverData and postData array can be used to override usage of PHP's
-     * global _SERVER and _POST variable respectively.
-     *
-     * @param array $serverData
-     * @param array $postData
-     */
-    public function __construct(array $serverData = null, array $postData = null) {
-
-       if ($serverData) $this->_SERVER = $serverData;
-       else $this->_SERVER =& $_SERVER;
-
-       if ($postData) $this->_POST = $postData;
-       else $this->_POST =& $_POST;
-
-    }
-
-    /**
-     * Returns the value for a specific http header.
-     *
-     * This method returns null if the header did not exist.
-     *
-     * @param string $name
-     * @return string
-     */
-    public function getHeader($name) {
-
-        $name = strtoupper(str_replace(array('-'),array('_'),$name));
-        if (isset($this->_SERVER['HTTP_' . $name])) {
-            return $this->_SERVER['HTTP_' . $name];
-        }
-
-        // There's a few headers that seem to end up in the top-level
-        // server array.
-        switch($name) {
-            case 'CONTENT_TYPE' :
-            case 'CONTENT_LENGTH' :
-                if (isset($this->_SERVER[$name])) {
-                    return $this->_SERVER[$name];
-                }
-                break;
-
-        }
-        return;
-
-    }
-
-    /**
-     * Returns all (known) HTTP headers.
-     *
-     * All headers are converted to lower-case, and additionally all underscores
-     * are automatically converted to dashes
-     *
-     * @return array
-     */
-    public function getHeaders() {
-
-        $hdrs = array();
-        foreach($this->_SERVER as $key=>$value) {
-
-            switch($key) {
-                case 'CONTENT_LENGTH' :
-                case 'CONTENT_TYPE' :
-                    $hdrs[strtolower(str_replace('_','-',$key))] = $value;
-                    break;
-                default :
-                    if (strpos($key,'HTTP_')===0) {
-                        $hdrs[substr(strtolower(str_replace('_','-',$key)),5)] = $value;
-                    }
-                    break;
-            }
-
-        }
-
-        return $hdrs;
-
-    }
-
-    /**
-     * Returns the HTTP request method
-     *
-     * This is for example POST or GET
-     *
-     * @return string
-     */
-    public function getMethod() {
-
-        return $this->_SERVER['REQUEST_METHOD'];
-
-    }
-
-    /**
-     * Returns the requested uri
-     *
-     * @return string
-     */
-    public function getUri() {
-
-        return $this->_SERVER['REQUEST_URI'];
-
-    }
-
-    /**
-     * Will return protocol + the hostname + the uri
-     *
-     * @return string
-     */
-    public function getAbsoluteUri() {
-
-        // Checking if the request was made through HTTPS. The last in line is for IIS
-        $protocol = isset($this->_SERVER['HTTPS']) && ($this->_SERVER['HTTPS']) && ($this->_SERVER['HTTPS']!='off');
-        return ($protocol?'https':'http') . '://'  . $this->getHeader('Host') . $this->getUri();
-
-    }
-
-    /**
-     * Returns everything after the ? from the current url
-     *
-     * @return string
-     */
-    public function getQueryString() {
-
-        return isset($this->_SERVER['QUERY_STRING'])?$this->_SERVER['QUERY_STRING']:'';
-
-    }
-
-    /**
-     * Returns the HTTP request body body
-     *
-     * This method returns a readable stream resource.
-     * If the asString parameter is set to true, a string is sent instead.
-     *
-     * @param bool $asString
-     * @return resource
-     */
-    public function getBody($asString = false) {
-
-        if (is_null($this->body)) {
-            if (!is_null(self::$defaultInputStream)) {
-                $this->body = self::$defaultInputStream;
-            } else {
-                $this->body = fopen('php://input','r');
-                self::$defaultInputStream = $this->body;
-            }
-        }
-        if ($asString) {
-            $body = stream_get_contents($this->body);
-            return $body;
-        } else {
-            return $this->body;
-        }
-
-    }
-
-    /**
-     * Sets the contents of the HTTP request body
-     *
-     * This method can either accept a string, or a readable stream resource.
-     *
-     * If the setAsDefaultInputStream is set to true, it means for this run of the
-     * script the supplied body will be used instead of php://input.
-     *
-     * @param mixed $body
-     * @param bool $setAsDefaultInputStream
-     * @return void
-     */
-    public function setBody($body,$setAsDefaultInputStream = false) {
-
-        if(is_resource($body)) {
-            $this->body = $body;
-        } else {
-
-            $stream = fopen('php://temp','r+');
-            fputs($stream,$body);
-            rewind($stream);
-            // String is assumed
-            $this->body = $stream;
-        }
-        if ($setAsDefaultInputStream) {
-            self::$defaultInputStream = $this->body;
-        }
-
-    }
-
-    /**
-     * Returns PHP's _POST variable.
-     *
-     * The reason this is in a method is so it can be subclassed and
-     * overridden.
-     *
-     * @return array
-     */
-    public function getPostVars() {
-
-        return $this->_POST;
-
-    }
-
-    /**
-     * Returns a specific item from the _SERVER array.
-     *
-     * Do not rely on this feature, it is for internal use only.
-     *
-     * @param string $field
-     * @return string
-     */
-    public function getRawServerValue($field) {
-
-        return isset($this->_SERVER[$field])?$this->_SERVER[$field]:null;
-
-    }
-
-    /**
-     * Returns the HTTP version specified within the request.
-     *
-     * @return string
-     */
-    public function getHTTPVersion() {
-
-        $protocol = $this->getRawServerValue('SERVER_PROTOCOL');
-        if ($protocol==='HTTP/1.0') {
-            return '1.0';
-        } else {
-            return '1.1';
-        }
-
-    }
-
-}
-
diff --git a/vendor/sabre/dav/lib/Sabre/HTTP/Response.php b/vendor/sabre/dav/lib/Sabre/HTTP/Response.php
deleted file mode 100644
index a7fc0da12..000000000
--- a/vendor/sabre/dav/lib/Sabre/HTTP/Response.php
+++ /dev/null
@@ -1,175 +0,0 @@
-<?php
-
-namespace Sabre\HTTP;
-
-/**
- * This class represents a HTTP response.
- *
- * It contains the HTTP status code, response headers and a message body.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Response {
-
-    /**
-     * The HTTP version to return in the header() line.
-     *
-     * By default you will definitely want this to be HTTP/1.1, but in some
-     * edge cases (most notably pre 1.2 nginx servers acting as a proxy), you
-     * want to force this to 1.0.
-     *
-     * @var string
-     */
-    public $defaultHttpVersion = '1.1';
-
-    /**
-     * Returns a full HTTP status message for an HTTP status code
-     *
-     * @param int $code
-     * @return string
-     */
-    public function getStatusMessage($code, $httpVersion = '1.1') {
-
-        $msg = array(
-            100 => 'Continue',
-            101 => 'Switching Protocols',
-            102 => 'Processing',
-            200 => 'OK',
-            201 => 'Created',
-            202 => 'Accepted',
-            203 => 'Non-Authorative Information',
-            204 => 'No Content',
-            205 => 'Reset Content',
-            206 => 'Partial Content',
-            207 => 'Multi-Status', // RFC 4918
-            208 => 'Already Reported', // RFC 5842
-            226 => 'IM Used', // RFC 3229
-            300 => 'Multiple Choices',
-            301 => 'Moved Permanently',
-            302 => 'Found',
-            303 => 'See Other',
-            304 => 'Not Modified',
-            305 => 'Use Proxy',
-            306 => 'Reserved',
-            307 => 'Temporary Redirect',
-            400 => 'Bad request',
-            401 => 'Unauthorized',
-            402 => 'Payment Required',
-            403 => 'Forbidden',
-            404 => 'Not Found',
-            405 => 'Method Not Allowed',
-            406 => 'Not Acceptable',
-            407 => 'Proxy Authentication Required',
-            408 => 'Request Timeout',
-            409 => 'Conflict',
-            410 => 'Gone',
-            411 => 'Length Required',
-            412 => 'Precondition failed',
-            413 => 'Request Entity Too Large',
-            414 => 'Request-URI Too Long',
-            415 => 'Unsupported Media Type',
-            416 => 'Requested Range Not Satisfiable',
-            417 => 'Expectation Failed',
-            418 => 'I\'m a teapot', // RFC 2324
-            422 => 'Unprocessable Entity', // RFC 4918
-            423 => 'Locked', // RFC 4918
-            424 => 'Failed Dependency', // RFC 4918
-            426 => 'Upgrade required',
-            428 => 'Precondition required', // draft-nottingham-http-new-status
-            429 => 'Too Many Requests', // draft-nottingham-http-new-status
-            431 => 'Request Header Fields Too Large', // draft-nottingham-http-new-status
-            500 => 'Internal Server Error',
-            501 => 'Not Implemented',
-            502 => 'Bad Gateway',
-            503 => 'Service Unavailable',
-            504 => 'Gateway Timeout',
-            505 => 'HTTP Version not supported',
-            506 => 'Variant Also Negotiates',
-            507 => 'Insufficient Storage', // RFC 4918
-            508 => 'Loop Detected', // RFC 5842
-            509 => 'Bandwidth Limit Exceeded', // non-standard
-            510 => 'Not extended',
-            511 => 'Network Authentication Required', // draft-nottingham-http-new-status
-       );
-
-       return 'HTTP/' . $httpVersion . ' ' . $code . ' ' . $msg[$code];
-
-    }
-
-    // @codeCoverageIgnoreStart
-    // We cannot reasonably test header() related methods.
-
-    /**
-     * Sends an HTTP status header to the client.
-     *
-     * @param int $code HTTP status code
-     * @return bool
-     */
-    public function sendStatus($code) {
-
-        if (!headers_sent())
-            return header($this->getStatusMessage($code, $this->defaultHttpVersion));
-        else return false;
-
-    }
-
-    /**
-     * Sets an HTTP header for the response
-     *
-     * @param string $name
-     * @param string $value
-     * @param bool $replace
-     * @return bool
-     */
-    public function setHeader($name, $value, $replace = true) {
-
-        $value = str_replace(array("\r","\n"),array('\r','\n'),$value);
-        if (!headers_sent())
-            return header($name . ': ' . $value, $replace);
-        else return false;
-
-
-    }
-    // @codeCoverageIgnoreEnd
-
-    /**
-     * Sets a bunch of HTTP Headers
-     *
-     * headersnames are specified as keys, value in the array value
-     *
-     * @param array $headers
-     * @return void
-     */
-    public function setHeaders(array $headers) {
-
-        foreach($headers as $key=>$value)
-            $this->setHeader($key, $value);
-
-    }
-
-    /**
-     * Sends the entire response body
-     *
-     * This method can accept either an open filestream, or a string.
-     *
-     * @param mixed $body
-     * @return void
-     */
-    public function sendBody($body) {
-
-        if (is_resource($body)) {
-
-            file_put_contents('php://output', $body);
-
-        } else {
-
-            // We assume a string
-            echo $body;
-
-        }
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/HTTP/Util.php b/vendor/sabre/dav/lib/Sabre/HTTP/Util.php
deleted file mode 100644
index 147246253..000000000
--- a/vendor/sabre/dav/lib/Sabre/HTTP/Util.php
+++ /dev/null
@@ -1,82 +0,0 @@
-<?php
-
-namespace Sabre\HTTP;
-
-/**
- * HTTP utility methods
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @author Paul Voegler
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Util {
-
-    /**
-     * Parses a RFC2616-compatible date string
-     *
-     * This method returns false if the date is invalid
-     *
-     * @param string $dateHeader
-     * @return bool|DateTime
-     */
-    static function parseHTTPDate($dateHeader) {
-
-        //RFC 2616 section 3.3.1 Full Date
-        //Only the format is checked, valid ranges are checked by strtotime below
-        $month = '(Jan|Feb|Mar|Apr|May|Jun|Jul|Aug|Sep|Oct|Nov|Dec)';
-        $weekday = '(Monday|Tuesday|Wednesday|Thursday|Friday|Saturday|Sunday)';
-        $wkday = '(Mon|Tue|Wed|Thu|Fri|Sat|Sun)';
-        $time = '[0-2]\d(\:[0-5]\d){2}';
-        $date3 = $month . ' ([1-3]\d| \d)';
-        $date2 = '[0-3]\d\-' . $month . '\-\d\d';
-        //4-digit year cannot begin with 0 - unix timestamp begins in 1970
-        $date1 = '[0-3]\d ' . $month . ' [1-9]\d{3}';
-
-        //ANSI C's asctime() format
-        //4-digit year cannot begin with 0 - unix timestamp begins in 1970
-        $asctime_date = $wkday . ' ' . $date3 . ' ' . $time . ' [1-9]\d{3}';
-        //RFC 850, obsoleted by RFC 1036
-        $rfc850_date = $weekday . ', ' . $date2 . ' ' . $time . ' GMT';
-        //RFC 822, updated by RFC 1123
-        $rfc1123_date = $wkday . ', ' . $date1 . ' ' . $time . ' GMT';
-        //allowed date formats by RFC 2616
-        $HTTP_date = "($rfc1123_date|$rfc850_date|$asctime_date)";
-
-        //allow for space around the string and strip it
-        $dateHeader = trim($dateHeader, ' ');
-        if (!preg_match('/^' . $HTTP_date . '$/', $dateHeader))
-            return false;
-
-        //append implicit GMT timezone to ANSI C time format
-        if (strpos($dateHeader, ' GMT') === false)
-            $dateHeader .= ' GMT';
-
-
-        $realDate = strtotime($dateHeader);
-        //strtotime can return -1 or false in case of error
-        if ($realDate !== false && $realDate >= 0)
-            return new \DateTime('@' . $realDate, new \DateTimeZone('UTC'));
-
-    }
-
-    /**
-     * Transforms a DateTime object to HTTP's most common date format.
-     *
-     * We're serializing it as the RFC 1123 date, which, for HTTP must be
-     * specified as GMT.
-     *
-     * @param \DateTime $dateTime
-     * @return string
-     */
-    static function toHTTPDate(\DateTime $dateTime) {
-
-        // We need to clone it, as we don't want to affect the existing
-        // DateTime.
-        $dateTime = clone $dateTime;
-        $dateTime->setTimeZone(new \DateTimeZone('GMT'));
-        return $dateTime->format('D, d M Y H:i:s \G\M\T');
-
-    }
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/HTTP/Version.php b/vendor/sabre/dav/lib/Sabre/HTTP/Version.php
deleted file mode 100644
index 0e913835c..000000000
--- a/vendor/sabre/dav/lib/Sabre/HTTP/Version.php
+++ /dev/null
@@ -1,24 +0,0 @@
-<?php
-
-namespace Sabre\HTTP;
-
-/**
- * This class contains the Sabre\HTTP version constants.
- *
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-class Version {
-
-    /**
-     * Full version number
-     */
-    const VERSION = '1.8.9';
-
-    /**
-     * Stability : alpha, beta, stable
-     */
-    const STABILITY = 'stable';
-
-}
diff --git a/vendor/sabre/dav/lib/Sabre/autoload.php b/vendor/sabre/dav/lib/Sabre/autoload.php
deleted file mode 100644
index c5945ee1d..000000000
--- a/vendor/sabre/dav/lib/Sabre/autoload.php
+++ /dev/null
@@ -1,25 +0,0 @@
-<?php
-
-/**
- * SabreDAV's autoloader
- *
- * This file is kept for backwards compatibility purposes.
- * SabreDAV now uses the composer autoloader.
- *
- * You should stop including this file, and include 'vendor/autoload.php'
- * instead.
- *
- * @deprecated Will be removed in a future version!
- * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
- * @author Evert Pot (http://evertpot.com/)
- * @license http://sabre.io/license/ Modified BSD License
- */
-
-/**
- * We are assuming that the composer autoloader is just 2 directories up.
- *
- * This is not the case when sabredav is installed as a dependency. But, in
- * those cases it's not expected that people will look for this file anyway.
- */
-
-require __DIR__ . '/../../vendor/autoload.php';