another bulk of composer updates

(cherry picked from commit 6685381fd8db507493c3d7c1793f8c05c681bbce)

223 files changed, 6890 insertions, 7561 deletions

diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/AbstractBackend.php b/vendor/sabre/dav/lib/CalDAV/Backend/AbstractBackend.php
index 311b1c415..336e104c8 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/AbstractBackend.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/AbstractBackend.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Backend;
 
 use Sabre\CalDAV;
@@ -14,8 +16,8 @@ use Sabre\VObject;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class AbstractBackend implements BackendInterface {
-
+abstract class AbstractBackend implements BackendInterface
+{
     /**
      * Updates properties for a calendar.
      *
@@ -28,12 +30,11 @@ abstract class AbstractBackend implements BackendInterface {
      *
      * Read the PropPatch documentation for more info and examples.
      *
-     * @param mixed $calendarId
+     * @param mixed                $calendarId
      * @param \Sabre\DAV\PropPatch $propPatch
-     * @return void
      */
-    function updateCalendar($calendarId, \Sabre\DAV\PropPatch $propPatch) {
-
+    public function updateCalendar($calendarId, \Sabre\DAV\PropPatch $propPatch)
+    {
     }
 
     /**
@@ -46,14 +47,14 @@ abstract class AbstractBackend implements BackendInterface {
      *
      * @param mixed $calendarId
      * @param array $uris
+     *
      * @return array
      */
-    function getMultipleCalendarObjects($calendarId, array $uris) {
-
-        return array_map(function($uri) use ($calendarId) {
+    public function getMultipleCalendarObjects($calendarId, array $uris)
+    {
+        return array_map(function ($uri) use ($calendarId) {
             return $this->getCalendarObject($calendarId, $uri);
         }, $uris);
-
     }
 
     /**
@@ -103,23 +104,21 @@ abstract class AbstractBackend implements BackendInterface {
      *
      * @param mixed $calendarId
      * @param array $filters
+     *
      * @return array
      */
-    function calendarQuery($calendarId, array $filters) {
-
+    public function calendarQuery($calendarId, array $filters)
+    {
         $result = [];
         $objects = $this->getCalendarObjects($calendarId);
 
         foreach ($objects as $object) {
-
             if ($this->validateFilterForObject($object, $filters)) {
                 $result[] = $object['uri'];
             }
-
         }
 
         return $result;
-
     }
 
     /**
@@ -128,10 +127,11 @@ abstract class AbstractBackend implements BackendInterface {
      *
      * @param array $object
      * @param array $filters
+     *
      * @return bool
      */
-    protected function validateFilterForObject(array $object, array $filters) {
-
+    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.
@@ -148,7 +148,6 @@ abstract class AbstractBackend implements BackendInterface {
         $vObject->destroy();
 
         return $result;
-
     }
 
     /**
@@ -168,14 +167,14 @@ abstract class AbstractBackend implements BackendInterface {
      *
      * @param string $principalUri
      * @param string $uid
+     *
      * @return string|null
      */
-    function getCalendarObjectByUID($principalUri, $uid) {
-
+    public function getCalendarObjectByUID($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;
@@ -189,38 +188,35 @@ abstract class AbstractBackend implements BackendInterface {
             $results = $this->calendarQuery(
                 $calendar['id'],
                 [
-                    'name'         => 'VCALENDAR',
+                    'name' => 'VCALENDAR',
                     'prop-filters' => [],
                     'comp-filters' => [
                         [
-                            'name'           => 'VEVENT',
+                            'name' => 'VEVENT',
                             'is-not-defined' => false,
-                            'time-range'     => null,
-                            'comp-filters'   => [],
-                            'prop-filters'   => [
+                            'time-range' => null,
+                            'comp-filters' => [],
+                            'prop-filters' => [
                                 [
-                                    'name'           => 'UID',
+                                    'name' => 'UID',
                                     'is-not-defined' => false,
-                                    'time-range'     => null,
-                                    'text-match'     => [
-                                        'value'            => $uid,
+                                    'time-range' => null,
+                                    'text-match' => [
+                                        'value' => $uid,
                                         'negate-condition' => false,
-                                        'collation'        => 'i;octet',
+                                        'collation' => 'i;octet',
                                     ],
                                     'param-filters' => [],
                                 ],
-                            ]
-                        ]
+                            ],
+                        ],
                     ],
                 ]
             );
             if ($results) {
                 // We have a match
-                return $calendar['uri'] . '/' . $results[0];
+                return $calendar['uri'].'/'.$results[0];
             }
-
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/BackendInterface.php b/vendor/sabre/dav/lib/CalDAV/Backend/BackendInterface.php
index bd8ee7602..7d125cf89 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/BackendInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Backend;
 
 /**
@@ -9,8 +11,8 @@ namespace Sabre\CalDAV\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface BackendInterface {
-
+interface BackendInterface
+{
     /**
      * Returns a list of calendars for a principal.
      *
@@ -34,9 +36,10 @@ interface BackendInterface {
      * ACL will automatically be put in read-only mode.
      *
      * @param string $principalUri
+     *
      * @return array
      */
-    function getCalendarsForUser($principalUri);
+    public function getCalendarsForUser($principalUri);
 
     /**
      * Creates a new calendar for a principal.
@@ -48,10 +51,11 @@ interface BackendInterface {
      *
      * @param string $principalUri
      * @param string $calendarUri
-     * @param array $properties
+     * @param array  $properties
+     *
      * @return mixed
      */
-    function createCalendar($principalUri, $calendarUri, array $properties);
+    public function createCalendar($principalUri, $calendarUri, array $properties);
 
     /**
      * Updates properties for a calendar.
@@ -65,19 +69,17 @@ interface BackendInterface {
      *
      * Read the PropPatch documentation for more info and examples.
      *
-     * @param mixed $calendarId
+     * @param mixed                $calendarId
      * @param \Sabre\DAV\PropPatch $propPatch
-     * @return void
      */
-    function updateCalendar($calendarId, \Sabre\DAV\PropPatch $propPatch);
+    public function updateCalendar($calendarId, \Sabre\DAV\PropPatch $propPatch);
 
     /**
-     * Delete a calendar and all its objects
+     * Delete a calendar and all its objects.
      *
      * @param mixed $calendarId
-     * @return void
      */
-    function deleteCalendar($calendarId);
+    public function deleteCalendar($calendarId);
 
     /**
      * Returns all calendar objects within a calendar.
@@ -108,9 +110,10 @@ interface BackendInterface {
      * amount of times this is needed is reduced by a great degree.
      *
      * @param mixed $calendarId
+     *
      * @return array
      */
-    function getCalendarObjects($calendarId);
+    public function getCalendarObjects($calendarId);
 
     /**
      * Returns information from a single calendar object, based on it's object
@@ -124,11 +127,12 @@ interface BackendInterface {
      *
      * This method must return null if the object did not exist.
      *
-     * @param mixed $calendarId
+     * @param mixed  $calendarId
      * @param string $objectUri
+     *
      * @return array|null
      */
-    function getCalendarObject($calendarId, $objectUri);
+    public function getCalendarObject($calendarId, $objectUri);
 
     /**
      * Returns a list of calendar objects.
@@ -140,9 +144,10 @@ interface BackendInterface {
      *
      * @param mixed $calendarId
      * @param array $uris
+     *
      * @return array
      */
-    function getMultipleCalendarObjects($calendarId, array $uris);
+    public function getMultipleCalendarObjects($calendarId, array $uris);
 
     /**
      * Creates a new calendar object.
@@ -157,12 +162,13 @@ interface BackendInterface {
      * 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 mixed  $calendarId
      * @param string $objectUri
      * @param string $calendarData
+     *
      * @return string|null
      */
-    function createCalendarObject($calendarId, $objectUri, $calendarData);
+    public function createCalendarObject($calendarId, $objectUri, $calendarData);
 
     /**
      * Updates an existing calendarobject, based on it's uri.
@@ -177,23 +183,23 @@ interface BackendInterface {
      * 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 mixed  $calendarId
      * @param string $objectUri
      * @param string $calendarData
+     *
      * @return string|null
      */
-    function updateCalendarObject($calendarId, $objectUri, $calendarData);
+    public function updateCalendarObject($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 mixed  $calendarId
      * @param string $objectUri
-     * @return void
      */
-    function deleteCalendarObject($calendarId, $objectUri);
+    public function deleteCalendarObject($calendarId, $objectUri);
 
     /**
      * Performs a calendar-query on the contents of this calendar.
@@ -242,9 +248,10 @@ interface BackendInterface {
      *
      * @param mixed $calendarId
      * @param array $filters
+     *
      * @return array
      */
-    function calendarQuery($calendarId, array $filters);
+    public function calendarQuery($calendarId, array $filters);
 
     /**
      * Searches through all of a users calendars and calendar objects to find
@@ -263,8 +270,8 @@ interface BackendInterface {
      *
      * @param string $principalUri
      * @param string $uid
+     *
      * @return string|null
      */
-    function getCalendarObjectByUID($principalUri, $uid);
-
+    public function getCalendarObjectByUID($principalUri, $uid);
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/NotificationSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/NotificationSupport.php
index bf2ef27a0..0ba493305 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/NotificationSupport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/NotificationSupport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Backend;
 
 use Sabre\CalDAV\Xml\Notification\NotificationInterface;
@@ -22,26 +24,26 @@ use Sabre\CalDAV\Xml\Notification\NotificationInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface NotificationSupport extends BackendInterface {
-
+interface NotificationSupport extends BackendInterface
+{
     /**
      * Returns a list of notifications for a given principal url.
      *
      * @param string $principalUri
+     *
      * @return NotificationInterface[]
      */
-    function getNotificationsForPrincipal($principalUri);
+    public function getNotificationsForPrincipal($principalUri);
 
     /**
      * This deletes a specific notifcation.
      *
      * This may be called by a client once it deems a notification handled.
      *
-     * @param string $principalUri
+     * @param string                $principalUri
      * @param NotificationInterface $notification
-     * @return void
      */
-    function deleteNotification($principalUri, NotificationInterface $notification);
+    public function deleteNotification($principalUri, NotificationInterface $notification);
 
     /**
      * This method is called when a user replied to a request to share.
@@ -49,13 +51,13 @@ interface NotificationSupport extends BackendInterface {
      * If the user chose to accept the share, this method should return the
      * newly created calendar url.
      *
-     * @param string $href The sharee who is replying (often a mailto: address)
-     * @param int $status One of the SharingPlugin::STATUS_* constants
+     * @param string $href        The sharee who is replying (often a mailto: address)
+     * @param int    $status      One of the SharingPlugin::STATUS_* constants
      * @param string $calendarUri The url to the calendar thats being shared
-     * @param string $inReplyTo The unique id this message is a response to
-     * @param string $summary A description of the reply
-     * @return null|string
+     * @param string $inReplyTo   The unique id this message is a response to
+     * @param string $summary     A description of the reply
+     *
+     * @return string|null
      */
-    function shareReply($href, $status, $calendarUri, $inReplyTo, $summary = null);
-
+    public function shareReply($href, $status, $calendarUri, $inReplyTo, $summary = null);
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php b/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php
index 458440588..003dc1392 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/PDO.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Backend;
 
 use Sabre\CalDAV;
@@ -9,7 +11,7 @@ use Sabre\DAV\Xml\Element\Sharee;
 use Sabre\VObject;
 
 /**
- * PDO CalDAV backend
+ * PDO CalDAV backend.
  *
  * This backend is used to store calendar-data in a PDO database, such as
  * sqlite or MySQL
@@ -18,15 +20,10 @@ use Sabre\VObject;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PDO extends AbstractBackend
-    implements
-        SyncSupport,
-        SubscriptionSupport,
-        SchedulingSupport,
-        SharingSupport {
-
+class PDO extends AbstractBackend implements SyncSupport, SubscriptionSupport, SchedulingSupport, SharingSupport
+{
     /**
-     * We need to specify a max date, because we need to stop *somewhere*
+     * 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
@@ -36,14 +33,14 @@ class PDO extends AbstractBackend
     const MAX_DATE = '2038-01-01';
 
     /**
-     * pdo
+     * pdo.
      *
      * @var \PDO
      */
     protected $pdo;
 
     /**
-     * The table name that will be used for calendars
+     * The table name that will be used for calendars.
      *
      * @var string
      */
@@ -60,7 +57,7 @@ class PDO extends AbstractBackend
     public $calendarInstancesTableName = 'calendarinstances';
 
     /**
-     * The table name that will be used for calendar objects
+     * The table name that will be used for calendar objects.
      *
      * @var string
      */
@@ -96,11 +93,11 @@ class PDO extends AbstractBackend
      * @var array
      */
     public $propertyMap = [
-        '{DAV:}displayname'                                   => 'displayname',
+        '{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',
+        '{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',
     ];
 
     /**
@@ -109,24 +106,23 @@ class PDO extends AbstractBackend
      * @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',
+        '{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
+     * Creates the backend.
      *
      * @param \PDO $pdo
      */
-    function __construct(\PDO $pdo) {
-
+    public function __construct(\PDO $pdo)
+    {
         $this->pdo = $pdo;
-
     }
 
     /**
@@ -151,10 +147,11 @@ class PDO extends AbstractBackend
      * ACL will automatically be put in read-only mode.
      *
      * @param string $principalUri
+     *
      * @return array
      */
-    function getCalendarsForUser($principalUri) {
-
+    public function getCalendarsForUser($principalUri)
+    {
         $fields = array_values($this->propertyMap);
         $fields[] = 'calendarid';
         $fields[] = 'uri';
@@ -177,24 +174,23 @@ SQL
 
         $calendars = [];
         while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-
             $components = [];
             if ($row['components']) {
                 $components = explode(',', $row['components']);
             }
 
             $calendar = [
-                'id'                                                                 => [(int)$row['calendarid'], (int)$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'),
-                'share-resource-uri'                                                 => '/ns/share/' . $row['calendarid'],
+                'id' => [(int) $row['calendarid'], (int) $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($row['transparent'] ? 'transparent' : 'opaque'),
+                'share-resource-uri' => '/ns/share/'.$row['calendarid'],
             ];
 
-            $calendar['share-access'] = (int)$row['access'];
+            $calendar['share-access'] = (int) $row['access'];
             // 1 = owner, 2 = readonly, 3 = readwrite
             if ($row['access'] > 1) {
                 // We need to find more information about the original owner.
@@ -203,7 +199,7 @@ SQL
 
                 // read-only is for backwards compatbility. Might go away in
                 // the future.
-                $calendar['read-only'] = (int)$row['access'] === \Sabre\DAV\Sharing\Plugin::ACCESS_READ;
+                $calendar['read-only'] = \Sabre\DAV\Sharing\Plugin::ACCESS_READ === (int) $row['access'];
             }
 
             foreach ($this->propertyMap as $xmlName => $dbName) {
@@ -211,11 +207,9 @@ SQL
             }
 
             $calendars[] = $calendar;
-
         }
 
         return $calendars;
-
     }
 
     /**
@@ -226,11 +220,12 @@ SQL
      *
      * @param string $principalUri
      * @param string $calendarUri
-     * @param array $properties
+     * @param array  $properties
+     *
      * @return string
      */
-    function createCalendar($principalUri, $calendarUri, array $properties) {
-
+    public function createCalendar($principalUri, $calendarUri, array $properties)
+    {
         $fieldNames = [
             'principaluri',
             'uri',
@@ -239,51 +234,48 @@ SQL
         ];
         $values = [
             ':principaluri' => $principalUri,
-            ':uri'          => $calendarUri,
-            ':transparent'  => 0,
+            ':uri' => $calendarUri,
+            ':transparent' => 0,
         ];
 
-
         $sccs = '{urn:ietf:params:xml:ns:caldav}supported-calendar-component-set';
         if (!isset($properties[$sccs])) {
             // Default value
             $components = 'VEVENT,VTODO';
         } else {
             if (!($properties[$sccs] instanceof CalDAV\Xml\Property\SupportedCalendarComponentSet)) {
-                throw new DAV\Exception('The ' . $sccs . ' property must be of type: \Sabre\CalDAV\Xml\Property\SupportedCalendarComponentSet');
+                throw new DAV\Exception('The '.$sccs.' property must be of type: \Sabre\CalDAV\Xml\Property\SupportedCalendarComponentSet');
             }
             $components = implode(',', $properties[$sccs]->getValue());
         }
-        $transp = '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp';
+        $transp = '{'.CalDAV\Plugin::NS_CALDAV.'}schedule-calendar-transp';
         if (isset($properties[$transp])) {
-            $values[':transparent'] = $properties[$transp]->getValue() === 'transparent' ? 1 : 0;
+            $values[':transparent'] = 'transparent' === $properties[$transp]->getValue() ? 1 : 0;
         }
-        $stmt = $this->pdo->prepare("INSERT INTO " . $this->calendarTableName . " (synctoken, components) VALUES (1, ?)");
+        $stmt = $this->pdo->prepare('INSERT INTO '.$this->calendarTableName.' (synctoken, components) VALUES (1, ?)');
         $stmt->execute([$components]);
 
         $calendarId = $this->pdo->lastInsertId(
-            $this->calendarTableName . '_id_seq'
+            $this->calendarTableName.'_id_seq'
         );
 
         $values[':calendarid'] = $calendarId;
 
         foreach ($this->propertyMap as $xmlName => $dbName) {
             if (isset($properties[$xmlName])) {
-
-                $values[':' . $dbName] = $properties[$xmlName];
+                $values[':'.$dbName] = $properties[$xmlName];
                 $fieldNames[] = $dbName;
             }
         }
 
-        $stmt = $this->pdo->prepare("INSERT INTO " . $this->calendarInstancesTableName . " (" . implode(', ', $fieldNames) . ") VALUES (" . implode(', ', array_keys($values)) . ")");
+        $stmt = $this->pdo->prepare('INSERT INTO '.$this->calendarInstancesTableName.' ('.implode(', ', $fieldNames).') VALUES ('.implode(', ', array_keys($values)).')');
 
         $stmt->execute($values);
 
         return [
             $calendarId,
-            $this->pdo->lastInsertId($this->calendarInstancesTableName . '_id_seq')
+            $this->pdo->lastInsertId($this->calendarInstancesTableName.'_id_seq'),
         ];
-
     }
 
     /**
@@ -298,100 +290,88 @@ SQL
      *
      * Read the PropPatch documentation for more info and examples.
      *
-     * @param mixed $calendarId
+     * @param mixed                $calendarId
      * @param \Sabre\DAV\PropPatch $propPatch
-     * @return void
      */
-    function updateCalendar($calendarId, \Sabre\DAV\PropPatch $propPatch) {
-
+    public function updateCalendar($calendarId, \Sabre\DAV\PropPatch $propPatch)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
         list($calendarId, $instanceId) = $calendarId;
 
         $supportedProperties = array_keys($this->propertyMap);
-        $supportedProperties[] = '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp';
+        $supportedProperties[] = '{'.CalDAV\Plugin::NS_CALDAV.'}schedule-calendar-transp';
 
-        $propPatch->handle($supportedProperties, function($mutations) use ($calendarId, $instanceId) {
+        $propPatch->handle($supportedProperties, function ($mutations) use ($calendarId, $instanceId) {
             $newValues = [];
             foreach ($mutations as $propertyName => $propertyValue) {
-
                 switch ($propertyName) {
-                    case '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-calendar-transp' :
+                    case '{'.CalDAV\Plugin::NS_CALDAV.'}schedule-calendar-transp':
                         $fieldName = 'transparent';
-                        $newValues[$fieldName] = $propertyValue->getValue() === 'transparent';
+                        $newValues[$fieldName] = 'transparent' === $propertyValue->getValue();
                         break;
-                    default :
+                    default:
                         $fieldName = $this->propertyMap[$propertyName];
                         $newValues[$fieldName] = $propertyValue;
                         break;
                 }
-
             }
             $valuesSql = [];
             foreach ($newValues as $fieldName => $value) {
-                $valuesSql[] = $fieldName . ' = ?';
+                $valuesSql[] = $fieldName.' = ?';
             }
 
-            $stmt = $this->pdo->prepare("UPDATE " . $this->calendarInstancesTableName . " SET " . implode(', ', $valuesSql) . " WHERE id = ?");
+            $stmt = $this->pdo->prepare('UPDATE '.$this->calendarInstancesTableName.' SET '.implode(', ', $valuesSql).' WHERE id = ?');
             $newValues['id'] = $instanceId;
             $stmt->execute(array_values($newValues));
 
-            $this->addChange($calendarId, "", 2);
+            $this->addChange($calendarId, '', 2);
 
             return true;
-
         });
-
     }
 
     /**
-     * Delete a calendar and all it's objects
+     * Delete a calendar and all it's objects.
      *
      * @param mixed $calendarId
-     * @return void
      */
-    function deleteCalendar($calendarId) {
-
+    public function deleteCalendar($calendarId)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
         list($calendarId, $instanceId) = $calendarId;
 
-        $stmt = $this->pdo->prepare('SELECT access FROM ' . $this->calendarInstancesTableName . ' where id = ?');
+        $stmt = $this->pdo->prepare('SELECT access FROM '.$this->calendarInstancesTableName.' where id = ?');
         $stmt->execute([$instanceId]);
-        $access = (int)$stmt->fetchColumn();
-
-        if ($access === \Sabre\DAV\Sharing\Plugin::ACCESS_SHAREDOWNER) {
+        $access = (int) $stmt->fetchColumn();
 
+        if (\Sabre\DAV\Sharing\Plugin::ACCESS_SHAREDOWNER === $access) {
             /**
              * If the user is the owner of the calendar, we delete all data and all
              * instances.
              **/
-            $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarObjectTableName . ' WHERE calendarid = ?');
+            $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarObjectTableName.' WHERE calendarid = ?');
             $stmt->execute([$calendarId]);
 
-            $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarChangesTableName . ' WHERE calendarid = ?');
+            $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarChangesTableName.' WHERE calendarid = ?');
             $stmt->execute([$calendarId]);
 
-            $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarInstancesTableName . ' WHERE calendarid = ?');
+            $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarInstancesTableName.' WHERE calendarid = ?');
             $stmt->execute([$calendarId]);
 
-            $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarTableName . ' WHERE id = ?');
+            $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarTableName.' WHERE id = ?');
             $stmt->execute([$calendarId]);
-
         } else {
-
             /**
              * If it was an instance of a shared calendar, we only delete that
              * instance.
              */
-            $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarInstancesTableName . ' WHERE id = ?');
+            $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarInstancesTableName.' WHERE id = ?');
             $stmt->execute([$instanceId]);
-
         }
-
-
     }
 
     /**
@@ -423,32 +403,32 @@ SQL
      * amount of times this is needed is reduced by a great degree.
      *
      * @param mixed $calendarId
+     *
      * @return array
      */
-    function getCalendarObjects($calendarId) {
-
+    public function getCalendarObjects($calendarId)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
         list($calendarId, $instanceId) = $calendarId;
 
-        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, calendarid, size, componenttype FROM ' . $this->calendarObjectTableName . ' WHERE 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'          => $row['uri'],
-                'lastmodified' => (int)$row['lastmodified'],
-                'etag'         => '"' . $row['etag'] . '"',
-                'size'         => (int)$row['size'],
-                'component'    => strtolower($row['componenttype']),
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'lastmodified' => (int) $row['lastmodified'],
+                'etag' => '"'.$row['etag'].'"',
+                'size' => (int) $row['size'],
+                'component' => strtolower($row['componenttype']),
             ];
         }
 
         return $result;
-
     }
 
     /**
@@ -463,33 +443,35 @@ SQL
      *
      * This method must return null if the object did not exist.
      *
-     * @param mixed $calendarId
+     * @param mixed  $calendarId
      * @param string $objectUri
+     *
      * @return array|null
      */
-    function getCalendarObject($calendarId, $objectUri) {
-
+    public function getCalendarObject($calendarId, $objectUri)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
         list($calendarId, $instanceId) = $calendarId;
 
-        $stmt = $this->pdo->prepare('SELECT id, uri, lastmodified, etag, calendarid, size, calendardata, componenttype FROM ' . $this->calendarObjectTableName . ' WHERE calendarid = ? AND uri = ?');
+        $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 (!$row) return null;
+        if (!$row) {
+            return null;
+        }
 
         return [
-            'id'           => $row['id'],
-            'uri'          => $row['uri'],
-            'lastmodified' => (int)$row['lastmodified'],
-            'etag'         => '"' . $row['etag'] . '"',
-            'size'         => (int)$row['size'],
+            'id' => $row['id'],
+            'uri' => $row['uri'],
+            'lastmodified' => (int) $row['lastmodified'],
+            'etag' => '"'.$row['etag'].'"',
+            'size' => (int) $row['size'],
             'calendardata' => $row['calendardata'],
-            'component'    => strtolower($row['componenttype']),
+            'component' => strtolower($row['componenttype']),
          ];
-
     }
 
     /**
@@ -502,10 +484,11 @@ SQL
      *
      * @param mixed $calendarId
      * @param array $uris
+     *
      * @return array
      */
-    function getMultipleCalendarObjects($calendarId, array $uris) {
-
+    public function getMultipleCalendarObjects($calendarId, array $uris)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
@@ -513,7 +496,7 @@ SQL
 
         $result = [];
         foreach (array_chunk($uris, 900) as $chunk) {
-            $query = 'SELECT id, uri, lastmodified, etag, calendarid, size, calendardata, componenttype FROM ' . $this->calendarObjectTableName . ' WHERE calendarid = ? AND uri IN (';
+            $query = 'SELECT id, uri, lastmodified, etag, calendarid, size, calendardata, componenttype FROM '.$this->calendarObjectTableName.' WHERE calendarid = ? AND uri IN (';
             // Inserting a whole bunch of question marks
             $query .= implode(',', array_fill(0, count($chunk), '?'));
             $query .= ')';
@@ -522,24 +505,21 @@ SQL
             $stmt->execute(array_merge([$calendarId], $chunk));
 
             while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-
                 $result[] = [
-                    'id'           => $row['id'],
-                    'uri'          => $row['uri'],
-                    'lastmodified' => (int)$row['lastmodified'],
-                    'etag'         => '"' . $row['etag'] . '"',
-                    'size'         => (int)$row['size'],
+                    'id' => $row['id'],
+                    'uri' => $row['uri'],
+                    'lastmodified' => (int) $row['lastmodified'],
+                    'etag' => '"'.$row['etag'].'"',
+                    'size' => (int) $row['size'],
                     'calendardata' => $row['calendardata'],
-                    'component'    => strtolower($row['componenttype']),
+                    'component' => strtolower($row['componenttype']),
                 ];
-
             }
         }
-        return $result;
 
+        return $result;
     }
 
-
     /**
      * Creates a new calendar object.
      *
@@ -553,13 +533,14 @@ SQL
      * 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 mixed  $calendarId
      * @param string $objectUri
      * @param string $calendarData
+     *
      * @return string|null
      */
-    function createCalendarObject($calendarId, $objectUri, $calendarData) {
-
+    public function createCalendarObject($calendarId, $objectUri, $calendarData)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
@@ -567,7 +548,7 @@ SQL
 
         $extraData = $this->getDenormalizedData($calendarData);
 
-        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->calendarObjectTableName . ' (calendarid, uri, calendardata, lastmodified, etag, size, componenttype, firstoccurence, lastoccurence, uid) VALUES (?,?,?,?,?,?,?,?,?,?)');
+        $stmt = $this->pdo->prepare('INSERT INTO '.$this->calendarObjectTableName.' (calendarid, uri, calendardata, lastmodified, etag, size, componenttype, firstoccurence, lastoccurence, uid) VALUES (?,?,?,?,?,?,?,?,?,?)');
         $stmt->execute([
             $calendarId,
             $objectUri,
@@ -582,8 +563,7 @@ SQL
         ]);
         $this->addChange($calendarId, $objectUri, 1);
 
-        return '"' . $extraData['etag'] . '"';
-
+        return '"'.$extraData['etag'].'"';
     }
 
     /**
@@ -599,13 +579,14 @@ SQL
      * 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 mixed  $calendarId
      * @param string $objectUri
      * @param string $calendarData
+     *
      * @return string|null
      */
-    function updateCalendarObject($calendarId, $objectUri, $calendarData) {
-
+    public function updateCalendarObject($calendarId, $objectUri, $calendarData)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
@@ -613,13 +594,12 @@ SQL
 
         $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 = $this->pdo->prepare('UPDATE '.$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 '"' . $extraData['etag'] . '"';
-
+        return '"'.$extraData['etag'].'"';
     }
 
     /**
@@ -635,10 +615,11 @@ SQL
      *   * uid - value of the UID property
      *
      * @param string $calendarData
+     *
      * @return array
      */
-    protected function getDenormalizedData($calendarData) {
-
+    protected function getDenormalizedData($calendarData)
+    {
         $vObject = VObject\Reader::read($calendarData);
         $componentType = null;
         $component = null;
@@ -646,16 +627,16 @@ SQL
         $lastOccurence = null;
         $uid = null;
         foreach ($vObject->getComponents() as $component) {
-            if ($component->name !== 'VTIMEZONE') {
+            if ('VTIMEZONE' !== $component->name) {
                 $componentType = $component->name;
-                $uid = (string)$component->UID;
+                $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') {
+        if ('VEVENT' === $componentType) {
             $firstOccurence = $component->DTSTART->getDateTime()->getTimeStamp();
             // Finding the last occurence is a bit harder
             if (!isset($component->RRULE)) {
@@ -673,7 +654,7 @@ SQL
                     $lastOccurence = $firstOccurence;
                 }
             } else {
-                $it = new VObject\Recur\EventIterator($vObject, (string)$component->UID);
+                $it = new VObject\Recur\EventIterator($vObject, (string) $component->UID);
                 $maxDate = new \DateTime(self::MAX_DATE);
                 if ($it->isInfinite()) {
                     $lastOccurence = $maxDate->getTimeStamp();
@@ -682,30 +663,31 @@ SQL
                     while ($it->valid() && $end < $maxDate) {
                         $end = $it->getDtEnd();
                         $it->next();
-
                     }
                     $lastOccurence = $end->getTimeStamp();
                 }
-
             }
 
             // Ensure Occurence values are positive
-            if ($firstOccurence < 0) $firstOccurence = 0;
-            if ($lastOccurence < 0) $lastOccurence = 0;
+            if ($firstOccurence < 0) {
+                $firstOccurence = 0;
+            }
+            if ($lastOccurence < 0) {
+                $lastOccurence = 0;
+            }
         }
 
         // Destroy circular references to PHP will GC the object.
         $vObject->destroy();
 
         return [
-            'etag'           => md5($calendarData),
-            'size'           => strlen($calendarData),
-            'componentType'  => $componentType,
+            'etag' => md5($calendarData),
+            'size' => strlen($calendarData),
+            'componentType' => $componentType,
             'firstOccurence' => $firstOccurence,
-            'lastOccurence'  => $lastOccurence,
-            'uid'            => $uid,
+            'lastOccurence' => $lastOccurence,
+            'uid' => $uid,
         ];
-
     }
 
     /**
@@ -713,22 +695,20 @@ SQL
      *
      * The object uri is only the basename, or filename and not a full path.
      *
-     * @param mixed $calendarId
+     * @param mixed  $calendarId
      * @param string $objectUri
-     * @return void
      */
-    function deleteCalendarObject($calendarId, $objectUri) {
-
+    public function deleteCalendarObject($calendarId, $objectUri)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
         list($calendarId, $instanceId) = $calendarId;
 
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarObjectTableName . ' WHERE calendarid = ? AND uri = ?');
+        $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarObjectTableName.' WHERE calendarid = ? AND uri = ?');
         $stmt->execute([$calendarId, $objectUri]);
 
         $this->addChange($calendarId, $objectUri, 3);
-
     }
 
     /**
@@ -781,10 +761,11 @@ SQL
      *
      * @param mixed $calendarId
      * @param array $filters
+     *
      * @return array
      */
-    function calendarQuery($calendarId, array $filters) {
-
+    public function calendarQuery($calendarId, array $filters)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
@@ -808,7 +789,7 @@ SQL
                 $requirePostFilter = false;
             }
             // There was a time-range filter
-            if ($componentType == 'VEVENT' && isset($filters['comp-filters'][0]['time-range'])) {
+            if ('VEVENT' == $componentType && isset($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
@@ -817,13 +798,12 @@ SQL
                     $requirePostFilter = false;
                 }
             }
-
         }
 
         if ($requirePostFilter) {
-            $query = "SELECT uri, calendardata FROM " . $this->calendarObjectTableName . " WHERE calendarid = :calendarid";
+            $query = 'SELECT uri, calendardata FROM '.$this->calendarObjectTableName.' WHERE calendarid = :calendarid';
         } else {
-            $query = "SELECT uri FROM " . $this->calendarObjectTableName . " WHERE calendarid = :calendarid";
+            $query = 'SELECT uri FROM '.$this->calendarObjectTableName.' WHERE calendarid = :calendarid';
         }
 
         $values = [
@@ -831,16 +811,16 @@ SQL
         ];
 
         if ($componentType) {
-            $query .= " AND componenttype = :componenttype";
+            $query .= ' AND componenttype = :componenttype';
             $values['componenttype'] = $componentType;
         }
 
         if ($timeRange && $timeRange['start']) {
-            $query .= " AND lastoccurence > :startdate";
+            $query .= ' AND lastoccurence > :startdate';
             $values['startdate'] = $timeRange['start']->getTimeStamp();
         }
         if ($timeRange && $timeRange['end']) {
-            $query .= " AND firstoccurence < :enddate";
+            $query .= ' AND firstoccurence < :enddate';
             $values['enddate'] = $timeRange['end']->getTimeStamp();
         }
 
@@ -855,11 +835,9 @@ SQL
                 }
             }
             $result[] = $row['uri'];
-
         }
 
         return $result;
-
     }
 
     /**
@@ -879,10 +857,11 @@ SQL
      *
      * @param string $principalUri
      * @param string $uid
+     *
      * @return string|null
      */
-    function getCalendarObjectByUID($principalUri, $uid) {
-
+    public function getCalendarObjectByUID($principalUri, $uid)
+    {
         $query = <<<SQL
 SELECT
     calendar_instances.uri AS calendaruri, calendarobjects.uri as objecturi
@@ -901,9 +880,8 @@ SQL;
         $stmt->execute([$principalUri, $uid]);
 
         if ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-            return $row['calendaruri'] . '/' . $row['objecturi'];
+            return $row['calendaruri'].'/'.$row['objecturi'];
         }
-
     }
 
     /**
@@ -956,37 +934,41 @@ SQL;
      *
      * The limit is 'suggestive'. You are free to ignore it.
      *
-     * @param mixed $calendarId
+     * @param mixed  $calendarId
      * @param string $syncToken
-     * @param int $syncLevel
-     * @param int $limit
+     * @param int    $syncLevel
+     * @param int    $limit
+     *
      * @return array
      */
-    function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null) {
-
+    public function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
         list($calendarId, $instanceId) = $calendarId;
 
         // Current synctoken
-        $stmt = $this->pdo->prepare('SELECT synctoken FROM ' . $this->calendarTableName . ' WHERE id = ?');
+        $stmt = $this->pdo->prepare('SELECT synctoken FROM '.$this->calendarTableName.' WHERE id = ?');
         $stmt->execute([$calendarId]);
         $currentToken = $stmt->fetchColumn(0);
 
-        if (is_null($currentToken)) return null;
+        if (is_null($currentToken)) {
+            return null;
+        }
 
         $result = [
             'syncToken' => $currentToken,
-            'added'     => [],
-            'modified'  => [],
-            'deleted'   => [],
+            '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;
+            $query = 'SELECT uri, operation FROM '.$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);
@@ -997,60 +979,54 @@ SQL;
             // 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 :
+                    case 1:
                         $result['added'][] = $uri;
                         break;
-                    case 2 :
+                    case 2:
                         $result['modified'][] = $uri;
                         break;
-                    case 3 :
+                    case 3:
                         $result['deleted'][] = $uri;
                         break;
                 }
-
             }
         } else {
             // No synctoken supplied, this is the initial sync.
-            $query = "SELECT uri FROM " . $this->calendarObjectTableName . " WHERE calendarid = ?";
+            $query = 'SELECT uri FROM '.$this->calendarObjectTableName.' WHERE calendarid = ?';
             $stmt = $this->pdo->prepare($query);
             $stmt->execute([$calendarId]);
 
             $result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
         }
-        return $result;
 
+        return $result;
     }
 
     /**
      * Adds a change record to the calendarchanges table.
      *
-     * @param mixed $calendarId
+     * @param mixed  $calendarId
      * @param string $objectUri
-     * @param int $operation 1 = add, 2 = modify, 3 = delete.
-     * @return void
+     * @param int    $operation  1 = add, 2 = modify, 3 = delete
      */
-    protected function addChange($calendarId, $objectUri, $operation) {
-
-        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->calendarChangesTableName . ' (uri, synctoken, calendarid, operation) SELECT ?, synctoken, ?, ? FROM ' . $this->calendarTableName . ' WHERE id = ?');
+    protected function addChange($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
+            $calendarId,
         ]);
-        $stmt = $this->pdo->prepare('UPDATE ' . $this->calendarTableName . ' SET synctoken = synctoken + 1 WHERE id = ?');
+        $stmt = $this->pdo->prepare('UPDATE '.$this->calendarTableName.' SET synctoken = synctoken + 1 WHERE id = ?');
         $stmt->execute([
-            $calendarId
+            $calendarId,
         ]);
-
     }
 
     /**
@@ -1082,10 +1058,11 @@ SQL;
      *    default components).
      *
      * @param string $principalUri
+     *
      * @return array
      */
-    function getSubscriptionsForUser($principalUri) {
-
+    public function getSubscriptionsForUser($principalUri)
+    {
         $fields = array_values($this->subscriptionPropertyMap);
         $fields[] = 'id';
         $fields[] = 'uri';
@@ -1095,20 +1072,19 @@ SQL;
 
         // 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 = $this->pdo->prepare('SELECT '.$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'],
+                'id' => $row['id'],
+                'uri' => $row['uri'],
                 'principaluri' => $row['principaluri'],
-                'source'       => $row['source'],
+                'source' => $row['source'],
                 'lastmodified' => $row['lastmodified'],
 
-                '{' . CalDAV\Plugin::NS_CALDAV . '}supported-calendar-component-set' => new CalDAV\Xml\Property\SupportedCalendarComponentSet(['VTODO', 'VEVENT']),
+                '{'.CalDAV\Plugin::NS_CALDAV.'}supported-calendar-component-set' => new CalDAV\Xml\Property\SupportedCalendarComponentSet(['VTODO', 'VEVENT']),
             ];
 
             foreach ($this->subscriptionPropertyMap as $xmlName => $dbName) {
@@ -1118,11 +1094,9 @@ SQL;
             }
 
             $subscriptions[] = $subscription;
-
         }
 
         return $subscriptions;
-
     }
 
     /**
@@ -1133,11 +1107,12 @@ SQL;
      *
      * @param string $principalUri
      * @param string $uri
-     * @param array $properties
+     * @param array  $properties
+     *
      * @return mixed
      */
-    function createSubscription($principalUri, $uri, array $properties) {
-
+    public function createSubscription($principalUri, $uri, array $properties)
+    {
         $fieldNames = [
             'principaluri',
             'uri',
@@ -1151,30 +1126,28 @@ SQL;
 
         $values = [
             ':principaluri' => $principalUri,
-            ':uri'          => $uri,
-            ':source'       => $properties['{http://calendarserver.org/ns/}source']->getHref(),
+            ':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];
+                $values[':'.$dbName] = $properties[$xmlName];
                 $fieldNames[] = $dbName;
             }
         }
 
-        $stmt = $this->pdo->prepare("INSERT INTO " . $this->calendarSubscriptionsTableName . " (" . implode(', ', $fieldNames) . ") VALUES (" . implode(', ', array_keys($values)) . ")");
+        $stmt = $this->pdo->prepare('INSERT INTO '.$this->calendarSubscriptionsTableName.' ('.implode(', ', $fieldNames).') VALUES ('.implode(', ', array_keys($values)).')');
         $stmt->execute($values);
 
         return $this->pdo->lastInsertId(
-            $this->calendarSubscriptionsTableName . '_id_seq'
+            $this->calendarSubscriptionsTableName.'_id_seq'
         );
-
     }
 
     /**
-     * Updates a subscription
+     * 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
@@ -1185,58 +1158,50 @@ SQL;
      *
      * Read the PropPatch documentation for more info and examples.
      *
-     * @param mixed $subscriptionId
+     * @param mixed                $subscriptionId
      * @param \Sabre\DAV\PropPatch $propPatch
-     * @return void
      */
-    function updateSubscription($subscriptionId, DAV\PropPatch $propPatch) {
-
+    public function updateSubscription($subscriptionId, DAV\PropPatch $propPatch)
+    {
         $supportedProperties = array_keys($this->subscriptionPropertyMap);
         $supportedProperties[] = '{http://calendarserver.org/ns/}source';
 
-        $propPatch->handle($supportedProperties, function($mutations) use ($subscriptionId) {
-
+        $propPatch->handle($supportedProperties, function ($mutations) use ($subscriptionId) {
             $newValues = [];
 
             foreach ($mutations as $propertyName => $propertyValue) {
-
-                if ($propertyName === '{http://calendarserver.org/ns/}source') {
+                if ('{http://calendarserver.org/ns/}source' === $propertyName) {
                     $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 . ' = ?';
+                $valuesSql[] = $fieldName.' = ?';
             }
 
-            $stmt = $this->pdo->prepare("UPDATE " . $this->calendarSubscriptionsTableName . " SET " . implode(', ', $valuesSql) . ", lastmodified = ? WHERE id = ?");
+            $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
+     * Deletes a subscription.
      *
      * @param mixed $subscriptionId
-     * @return void
      */
-    function deleteSubscription($subscriptionId) {
-
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->calendarSubscriptionsTableName . ' WHERE id = ?');
+    public function deleteSubscription($subscriptionId)
+    {
+        $stmt = $this->pdo->prepare('DELETE FROM '.$this->calendarSubscriptionsTableName.' WHERE id = ?');
         $stmt->execute([$subscriptionId]);
-
     }
 
     /**
@@ -1253,24 +1218,26 @@ SQL;
      *
      * @param string $principalUri
      * @param string $objectUri
+     *
      * @return array
      */
-    function getSchedulingObject($principalUri, $objectUri) {
-
-        $stmt = $this->pdo->prepare('SELECT uri, calendardata, lastmodified, etag, size FROM ' . $this->schedulingObjectTableName . ' WHERE principaluri = ? AND uri = ?');
+    public function getSchedulingObject($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 (!$row) return null;
+        if (!$row) {
+            return null;
+        }
 
         return [
-            'uri'          => $row['uri'],
+            'uri' => $row['uri'],
             'calendardata' => $row['calendardata'],
             'lastmodified' => $row['lastmodified'],
-            'etag'         => '"' . $row['etag'] . '"',
-            'size'         => (int)$row['size'],
+            'etag' => '"'.$row['etag'].'"',
+            'size' => (int) $row['size'],
          ];
-
     }
 
     /**
@@ -1282,40 +1249,38 @@ SQL;
      * 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 ' . $this->schedulingObjectTableName . ' WHERE principaluri = ?');
+    public function getSchedulingObjects($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'],
+                'uri' => $row['uri'],
                 'lastmodified' => $row['lastmodified'],
-                'etag'         => '"' . $row['etag'] . '"',
-                'size'         => (int)$row['size'],
+                'etag' => '"'.$row['etag'].'"',
+                'size' => (int) $row['size'],
             ];
         }
 
         return $result;
-
     }
 
     /**
-     * Deletes a scheduling object
+     * Deletes a scheduling object.
      *
      * @param string $principalUri
      * @param string $objectUri
-     * @return void
      */
-    function deleteSchedulingObject($principalUri, $objectUri) {
-
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->schedulingObjectTableName . ' WHERE principaluri = ? AND uri = ?');
+    public function deleteSchedulingObject($principalUri, $objectUri)
+    {
+        $stmt = $this->pdo->prepare('DELETE FROM '.$this->schedulingObjectTableName.' WHERE principaluri = ? AND uri = ?');
         $stmt->execute([$principalUri, $objectUri]);
-
     }
 
     /**
@@ -1324,35 +1289,32 @@ SQL;
      * @param string $principalUri
      * @param string $objectUri
      * @param string $objectData
-     * @return void
      */
-    function createSchedulingObject($principalUri, $objectUri, $objectData) {
-
-        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->schedulingObjectTableName . ' (principaluri, calendardata, uri, lastmodified, etag, size) VALUES (?, ?, ?, ?, ?, ?)');
+    public function createSchedulingObject($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)]);
-
     }
 
     /**
      * Updates the list of shares.
      *
-     * @param mixed $calendarId
+     * @param mixed                           $calendarId
      * @param \Sabre\DAV\Xml\Element\Sharee[] $sharees
-     * @return void
      */
-    function updateInvites($calendarId, array $sharees) {
-
+    public function updateInvites($calendarId, array $sharees)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to $calendarId is expected to be an array with a calendarId and an instanceId');
         }
         $currentInvites = $this->getInvites($calendarId);
         list($calendarId, $instanceId) = $calendarId;
 
-        $removeStmt = $this->pdo->prepare("DELETE FROM " . $this->calendarInstancesTableName . " WHERE calendarid = ? AND share_href = ? AND access IN (2,3)");
-        $updateStmt = $this->pdo->prepare("UPDATE " . $this->calendarInstancesTableName . " SET access = ?, share_displayname = ?, share_invitestatus = ? WHERE calendarid = ? AND share_href = ?");
+        $removeStmt = $this->pdo->prepare('DELETE FROM '.$this->calendarInstancesTableName.' WHERE calendarid = ? AND share_href = ? AND access IN (2,3)');
+        $updateStmt = $this->pdo->prepare('UPDATE '.$this->calendarInstancesTableName.' SET access = ?, share_displayname = ?, share_invitestatus = ? WHERE calendarid = ? AND share_href = ?');
 
         $insertStmt = $this->pdo->prepare('
-INSERT INTO ' . $this->calendarInstancesTableName . '
+INSERT INTO '.$this->calendarInstancesTableName.'
     (
         calendarid,
         principaluri,
@@ -1382,11 +1344,10 @@ INSERT INTO ' . $this->calendarInstancesTableName . '
         ?,
         ?,
         ?
-    FROM ' . $this->calendarInstancesTableName . ' WHERE id = ?');
+    FROM '.$this->calendarInstancesTableName.' WHERE id = ?');
 
         foreach ($sharees as $sharee) {
-
-            if ($sharee->access === \Sabre\DAV\Sharing\Plugin::ACCESS_NOACCESS) {
+            if (\Sabre\DAV\Sharing\Plugin::ACCESS_NOACCESS === $sharee->access) {
                 // if access was set no NOACCESS, it means access for an
                 // existing sharee was removed.
                 $removeStmt->execute([$calendarId, $sharee->href]);
@@ -1404,7 +1365,6 @@ INSERT INTO ' . $this->calendarInstancesTableName . '
             }
 
             foreach ($currentInvites as $oldSharee) {
-
                 if ($oldSharee->href === $sharee->href) {
                     // This is an update
                     $sharee->properties = array_merge(
@@ -1416,11 +1376,10 @@ INSERT INTO ' . $this->calendarInstancesTableName . '
                         isset($sharee->properties['{DAV:}displayname']) ? $sharee->properties['{DAV:}displayname'] : null,
                         $sharee->inviteStatus ?: $oldSharee->inviteStatus,
                         $calendarId,
-                        $sharee->href
+                        $sharee->href,
                     ]);
                     continue 2;
                 }
-
             }
             // If we got here, it means it was a new sharee
             $insertStmt->execute([
@@ -1431,11 +1390,9 @@ INSERT INTO ' . $this->calendarInstancesTableName . '
                 $sharee->href,
                 isset($sharee->properties['{DAV:}displayname']) ? $sharee->properties['{DAV:}displayname'] : null,
                 $sharee->inviteStatus ?: \Sabre\DAV\Sharing\Plugin::INVITE_NORESPONSE,
-                $instanceId
+                $instanceId,
             ]);
-
         }
-
     }
 
     /**
@@ -1451,10 +1408,11 @@ INSERT INTO ' . $this->calendarInstancesTableName . '
      *   $properties
      *
      * @param mixed $calendarId
+     *
      * @return \Sabre\DAV\Xml\Element\Sharee[]
      */
-    function getInvites($calendarId) {
-
+    public function getInvites($calendarId)
+    {
         if (!is_array($calendarId)) {
             throw new \InvalidArgumentException('The value passed to getInvites() is expected to be an array with a calendarId and an instanceId');
         }
@@ -1477,35 +1435,29 @@ SQL;
 
         $result = [];
         while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-
             $result[] = new Sharee([
-                'href'   => isset($row['share_href']) ? $row['share_href'] : \Sabre\HTTP\encodePath($row['principaluri']),
-                'access' => (int)$row['access'],
+                'href' => isset($row['share_href']) ? $row['share_href'] : \Sabre\HTTP\encodePath($row['principaluri']),
+                'access' => (int) $row['access'],
                 /// Everyone is always immediately accepted, for now.
-                'inviteStatus' => (int)$row['share_invitestatus'],
-                'properties'   =>
-                    !empty($row['share_displayname'])
+                'inviteStatus' => (int) $row['share_invitestatus'],
+                'properties' => !empty($row['share_displayname'])
                     ? ['{DAV:}displayname' => $row['share_displayname']]
                     : [],
                 'principal' => $row['principaluri'],
             ]);
-
         }
-        return $result;
 
+        return $result;
     }
 
     /**
-     * Publishes a calendar
+     * Publishes a calendar.
      *
      * @param mixed $calendarId
-     * @param bool $value
-     * @return void
+     * @param bool  $value
      */
-    function setPublishStatus($calendarId, $value) {
-
+    public function setPublishStatus($calendarId, $value)
+    {
         throw new DAV\Exception\NotImplemented('Not implemented');
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/SchedulingSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/SchedulingSupport.php
index 6ec0bf06b..7986d8c33 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/SchedulingSupport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/SchedulingSupport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Backend;
 
 /**
@@ -10,8 +12,8 @@ namespace Sabre\CalDAV\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface SchedulingSupport extends BackendInterface {
-
+interface SchedulingSupport extends BackendInterface
+{
     /**
      * Returns a single scheduling object for the inbox collection.
      *
@@ -26,9 +28,10 @@ interface SchedulingSupport extends BackendInterface {
      *
      * @param string $principalUri
      * @param string $objectUri
+     *
      * @return array
      */
-    function getSchedulingObject($principalUri, $objectUri);
+    public function getSchedulingObject($principalUri, $objectUri);
 
     /**
      * Returns all scheduling objects for the inbox collection.
@@ -39,18 +42,18 @@ interface SchedulingSupport extends BackendInterface {
      * The main difference is that 'calendardata' is optional.
      *
      * @param string $principalUri
+     *
      * @return array
      */
-    function getSchedulingObjects($principalUri);
+    public function getSchedulingObjects($principalUri);
 
     /**
      * Deletes a scheduling object from the inbox collection.
      *
      * @param string $principalUri
      * @param string $objectUri
-     * @return void
      */
-    function deleteSchedulingObject($principalUri, $objectUri);
+    public function deleteSchedulingObject($principalUri, $objectUri);
 
     /**
      * Creates a new scheduling object. This should land in a users' inbox.
@@ -58,8 +61,6 @@ interface SchedulingSupport extends BackendInterface {
      * @param string $principalUri
      * @param string $objectUri
      * @param string $objectData
-     * @return void
      */
-    function createSchedulingObject($principalUri, $objectUri, $objectData);
-
+    public function createSchedulingObject($principalUri, $objectUri, $objectData);
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/SharingSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/SharingSupport.php
index 278ec2564..ce6105990 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/SharingSupport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/SharingSupport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Backend;
 
 /**
@@ -20,16 +22,15 @@ namespace Sabre\CalDAV\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface SharingSupport extends BackendInterface {
-
+interface SharingSupport extends BackendInterface
+{
     /**
      * Updates the list of shares.
      *
-     * @param mixed $calendarId
+     * @param mixed                           $calendarId
      * @param \Sabre\DAV\Xml\Element\Sharee[] $sharees
-     * @return void
      */
-    function updateInvites($calendarId, array $sharees);
+    public function updateInvites($calendarId, array $sharees);
 
     /**
      * Returns the list of people whom this calendar is shared with.
@@ -44,17 +45,16 @@ interface SharingSupport extends BackendInterface {
      *   $properties
      *
      * @param mixed $calendarId
+     *
      * @return \Sabre\DAV\Xml\Element\Sharee[]
      */
-    function getInvites($calendarId);
+    public function getInvites($calendarId);
 
     /**
-     * Publishes a calendar
+     * Publishes a calendar.
      *
      * @param mixed $calendarId
-     * @param bool $value
-     * @return void
+     * @param bool  $value
      */
-    function setPublishStatus($calendarId, $value);
-
+    public function setPublishStatus($calendarId, $value);
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/SimplePDO.php b/vendor/sabre/dav/lib/CalDAV/Backend/SimplePDO.php
index d21f7f916..b6f3c8bef 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/SimplePDO.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/SimplePDO.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Backend;
 
 use Sabre\CalDAV;
@@ -31,24 +33,23 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SimplePDO extends AbstractBackend {
-
+class SimplePDO extends AbstractBackend
+{
     /**
-     * pdo
+     * pdo.
      *
      * @var \PDO
      */
     protected $pdo;
 
     /**
-     * Creates the backend
+     * Creates the backend.
      *
      * @param \PDO $pdo
      */
-    function __construct(\PDO $pdo) {
-
+    public function __construct(\PDO $pdo)
+    {
         $this->pdo = $pdo;
-
     }
 
     /**
@@ -73,27 +74,25 @@ class SimplePDO extends AbstractBackend {
      * ACL will automatically be put in read-only mode.
      *
      * @param string $principalUri
+     *
      * @return array
      */
-    function getCalendarsForUser($principalUri) {
-
+    public function getCalendarsForUser($principalUri)
+    {
         // Making fields a comma-delimited list
-        $stmt = $this->pdo->prepare("SELECT id, uri FROM simple_calendars WHERE principaluri = ? ORDER BY id ASC");
+        $stmt = $this->pdo->prepare('SELECT id, uri FROM simple_calendars WHERE principaluri = ? ORDER BY id ASC');
         $stmt->execute([$principalUri]);
 
         $calendars = [];
         while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-
             $calendars[] = [
-                'id'           => $row['id'],
-                'uri'          => $row['uri'],
+                'id' => $row['id'],
+                'uri' => $row['uri'],
                 'principaluri' => $principalUri,
             ];
-
         }
 
         return $calendars;
-
     }
 
     /**
@@ -104,32 +103,30 @@ class SimplePDO extends AbstractBackend {
      *
      * @param string $principalUri
      * @param string $calendarUri
-     * @param array $properties
+     * @param array  $properties
+     *
      * @return string
      */
-    function createCalendar($principalUri, $calendarUri, array $properties) {
-
-        $stmt = $this->pdo->prepare("INSERT INTO simple_calendars (principaluri, uri) VALUES (?, ?)");
+    public function createCalendar($principalUri, $calendarUri, array $properties)
+    {
+        $stmt = $this->pdo->prepare('INSERT INTO simple_calendars (principaluri, uri) VALUES (?, ?)');
         $stmt->execute([$principalUri, $calendarUri]);
 
         return $this->pdo->lastInsertId();
-
     }
 
     /**
-     * Delete a calendar and all it's objects
+     * Delete a calendar and all it's objects.
      *
      * @param string $calendarId
-     * @return void
      */
-    function deleteCalendar($calendarId) {
-
+    public function deleteCalendar($calendarId)
+    {
         $stmt = $this->pdo->prepare('DELETE FROM simple_calendarobjects WHERE calendarid = ?');
         $stmt->execute([$calendarId]);
 
         $stmt = $this->pdo->prepare('DELETE FROM simple_calendars WHERE id = ?');
         $stmt->execute([$calendarId]);
-
     }
 
     /**
@@ -161,27 +158,27 @@ class SimplePDO extends AbstractBackend {
      * amount of times this is needed is reduced by a great degree.
      *
      * @param string $calendarId
+     *
      * @return array
      */
-    function getCalendarObjects($calendarId) {
-
+    public function getCalendarObjects($calendarId)
+    {
         $stmt = $this->pdo->prepare('SELECT id, uri, calendardata FROM simple_calendarobjects WHERE calendarid = ?');
         $stmt->execute([$calendarId]);
 
         $result = [];
         foreach ($stmt->fetchAll(\PDO::FETCH_ASSOC) as $row) {
             $result[] = [
-                'id'           => $row['id'],
-                'uri'          => $row['uri'],
-                'etag'         => '"' . md5($row['calendardata']) . '"',
-                'calendarid'   => $calendarId,
-                'size'         => strlen($row['calendardata']),
+                'id' => $row['id'],
+                'uri' => $row['uri'],
+                'etag' => '"'.md5($row['calendardata']).'"',
+                'calendarid' => $calendarId,
+                'size' => strlen($row['calendardata']),
                 'calendardata' => $row['calendardata'],
             ];
         }
 
         return $result;
-
     }
 
     /**
@@ -198,25 +195,27 @@ class SimplePDO extends AbstractBackend {
      *
      * @param string $calendarId
      * @param string $objectUri
+     *
      * @return array|null
      */
-    function getCalendarObject($calendarId, $objectUri) {
-
+    public function getCalendarObject($calendarId, $objectUri)
+    {
         $stmt = $this->pdo->prepare('SELECT id, uri, calendardata FROM simple_calendarobjects WHERE calendarid = ? AND uri = ?');
         $stmt->execute([$calendarId, $objectUri]);
         $row = $stmt->fetch(\PDO::FETCH_ASSOC);
 
-        if (!$row) return null;
+        if (!$row) {
+            return null;
+        }
 
         return [
-            'id'           => $row['id'],
-            'uri'          => $row['uri'],
-            'etag'         => '"' . md5($row['calendardata']) . '"',
-            'calendarid'   => $calendarId,
-            'size'         => strlen($row['calendardata']),
+            'id' => $row['id'],
+            'uri' => $row['uri'],
+            'etag' => '"'.md5($row['calendardata']).'"',
+            'calendarid' => $calendarId,
+            'size' => strlen($row['calendardata']),
             'calendardata' => $row['calendardata'],
          ];
-
     }
 
     /**
@@ -232,22 +231,22 @@ class SimplePDO extends AbstractBackend {
      * 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 mixed  $calendarId
      * @param string $objectUri
      * @param string $calendarData
+     *
      * @return string|null
      */
-    function createCalendarObject($calendarId, $objectUri, $calendarData) {
-
+    public function createCalendarObject($calendarId, $objectUri, $calendarData)
+    {
         $stmt = $this->pdo->prepare('INSERT INTO simple_calendarobjects (calendarid, uri, calendardata) VALUES (?,?,?)');
         $stmt->execute([
             $calendarId,
             $objectUri,
-            $calendarData
+            $calendarData,
         ]);
 
-        return '"' . md5($calendarData) . '"';
-
+        return '"'.md5($calendarData).'"';
     }
 
     /**
@@ -263,18 +262,18 @@ class SimplePDO extends AbstractBackend {
      * 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 mixed  $calendarId
      * @param string $objectUri
      * @param string $calendarData
+     *
      * @return string|null
      */
-    function updateCalendarObject($calendarId, $objectUri, $calendarData) {
-
+    public function updateCalendarObject($calendarId, $objectUri, $calendarData)
+    {
         $stmt = $this->pdo->prepare('UPDATE simple_calendarobjects SET calendardata = ? WHERE calendarid = ? AND uri = ?');
         $stmt->execute([$calendarData, $calendarId, $objectUri]);
 
-        return '"' . md5($calendarData) . '"';
-
+        return '"'.md5($calendarData).'"';
     }
 
     /**
@@ -284,13 +283,10 @@ class SimplePDO extends AbstractBackend {
      *
      * @param string $calendarId
      * @param string $objectUri
-     * @return void
      */
-    function deleteCalendarObject($calendarId, $objectUri) {
-
+    public function deleteCalendarObject($calendarId, $objectUri)
+    {
         $stmt = $this->pdo->prepare('DELETE FROM simple_calendarobjects WHERE calendarid = ? AND uri = ?');
         $stmt->execute([$calendarId, $objectUri]);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/SubscriptionSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/SubscriptionSupport.php
index d77a2fe0f..2aaf95cdb 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/SubscriptionSupport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/SubscriptionSupport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Backend;
 
 use Sabre\DAV;
@@ -11,8 +13,8 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface SubscriptionSupport extends BackendInterface {
-
+interface SubscriptionSupport extends BackendInterface
+{
     /**
      * Returns a list of subscriptions for a principal.
      *
@@ -43,9 +45,10 @@ interface SubscriptionSupport extends BackendInterface {
      *    default components).
      *
      * @param string $principalUri
+     *
      * @return array
      */
-    function getSubscriptionsForUser($principalUri);
+    public function getSubscriptionsForUser($principalUri);
 
     /**
      * Creates a new subscription for a principal.
@@ -55,13 +58,14 @@ interface SubscriptionSupport extends BackendInterface {
      *
      * @param string $principalUri
      * @param string $uri
-     * @param array $properties
+     * @param array  $properties
+     *
      * @return mixed
      */
-    function createSubscription($principalUri, $uri, array $properties);
+    public function createSubscription($principalUri, $uri, array $properties);
 
     /**
-     * Updates a subscription
+     * 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
@@ -72,18 +76,15 @@ interface SubscriptionSupport extends BackendInterface {
      *
      * Read the PropPatch documentation for more info and examples.
      *
-     * @param mixed $subscriptionId
+     * @param mixed                $subscriptionId
      * @param \Sabre\DAV\PropPatch $propPatch
-     * @return void
      */
-    function updateSubscription($subscriptionId, DAV\PropPatch $propPatch);
+    public function updateSubscription($subscriptionId, DAV\PropPatch $propPatch);
 
     /**
      * Deletes a subscription.
      *
      * @param mixed $subscriptionId
-     * @return void
      */
-    function deleteSubscription($subscriptionId);
-
+    public function deleteSubscription($subscriptionId);
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Backend/SyncSupport.php b/vendor/sabre/dav/lib/CalDAV/Backend/SyncSupport.php
index a934505f9..c7f67d176 100644
--- a/vendor/sabre/dav/lib/CalDAV/Backend/SyncSupport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Backend/SyncSupport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Backend;
 
 /**
@@ -18,8 +20,8 @@ namespace Sabre\CalDAV\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface SyncSupport extends BackendInterface {
-
+interface SyncSupport extends BackendInterface
+{
     /**
      * The getChanges method returns all the changes that have happened, since
      * the specified syncToken in the specified calendar.
@@ -72,10 +74,10 @@ interface SyncSupport extends BackendInterface {
      *
      * @param string $calendarId
      * @param string $syncToken
-     * @param int $syncLevel
-     * @param int $limit
+     * @param int    $syncLevel
+     * @param int    $limit
+     *
      * @return array
      */
-    function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null);
-
+    public function getChangesForCalendar($calendarId, $syncToken, $syncLevel, $limit = null);
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Calendar.php b/vendor/sabre/dav/lib/CalDAV/Calendar.php
index 7467900cc..717f04f94 100644
--- a/vendor/sabre/dav/lib/CalDAV/Calendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/Calendar.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use Sabre\DAV;
@@ -16,46 +18,44 @@ use Sabre\DAVACL;
  * @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 {
-
+class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection, DAV\IMultiGet
+{
     use DAVACL\ACLTrait;
 
     /**
-     * This is an array with calendar information
+     * This is an array with calendar information.
      *
      * @var array
      */
     protected $calendarInfo;
 
     /**
-     * CalDAV backend
+     * CalDAV backend.
      *
      * @var Backend\BackendInterface
      */
     protected $caldavBackend;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param Backend\BackendInterface $caldavBackend
-     * @param array $calendarInfo
+     * @param array                    $calendarInfo
      */
-    function __construct(Backend\BackendInterface $caldavBackend, $calendarInfo) {
-
+    public function __construct(Backend\BackendInterface $caldavBackend, $calendarInfo)
+    {
         $this->caldavBackend = $caldavBackend;
         $this->calendarInfo = $calendarInfo;
-
     }
 
     /**
-     * Returns the name of the calendar
+     * Returns the name of the calendar.
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return $this->calendarInfo['uri'];
-
     }
 
     /**
@@ -68,69 +68,68 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      * Read the PropPatch documentation for more information.
      *
      * @param PropPatch $propPatch
-     * @return void
      */
-    function propPatch(PropPatch $propPatch) {
-
+    public function propPatch(PropPatch $propPatch)
+    {
         return $this->caldavBackend->updateCalendar($this->calendarInfo['id'], $propPatch);
-
     }
 
     /**
-     * Returns the list of properties
+     * Returns the list of properties.
      *
      * @param array $requestedProperties
+     *
      * @return array
      */
-    function getProperties($requestedProperties) {
-
+    public function getProperties($requestedProperties)
+    {
         $response = [];
 
         foreach ($this->calendarInfo as $propName => $propValue) {
-
-            if (!is_null($propValue) && $propName[0] === '{')
+            if (!is_null($propValue) && '{' === $propName[0]) {
                 $response[$propName] = $this->calendarInfo[$propName];
-
+            }
         }
-        return $response;
 
+        return $response;
     }
 
     /**
-     * Returns a calendar object
+     * 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) {
-
+    public function getChild($name)
+    {
         $obj = $this->caldavBackend->getCalendarObject($this->calendarInfo['id'], $name);
 
-        if (!$obj) throw new DAV\Exception\NotFound('Calendar object not found');
-
+        if (!$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
+     * Returns the full list of calendar objects.
      *
      * @return array
      */
-    function getChildren() {
-
+    public 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;
 
+        return $children;
     }
 
     /**
@@ -140,77 +139,75 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      * If any children are not found, you do not have to return them.
      *
      * @param string[] $paths
+     *
      * @return array
      */
-    function getMultipleChildren(array $paths) {
-
+    public 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;
 
+        return $children;
     }
 
     /**
      * Checks if a child-node exists.
      *
      * @param string $name
+     *
      * @return bool
      */
-    function childExists($name) {
-
+    public function childExists($name)
+    {
         $obj = $this->caldavBackend->getCalendarObject($this->calendarInfo['id'], $name);
-        if (!$obj)
+        if (!$obj) {
             return false;
-        else
+        } else {
             return true;
-
+        }
     }
 
     /**
-     * Creates a new directory
+     * Creates a new directory.
      *
      * We actually block this, as subdirectories are not allowed in calendars.
      *
      * @param string $name
-     * @return void
      */
-    function createDirectory($name) {
-
+    public function createDirectory($name)
+    {
         throw new DAV\Exception\MethodNotAllowed('Creating collections in calendar objects is not allowed');
-
     }
 
     /**
-     * Creates a new file
+     * Creates a new file.
      *
      * The contents of the new file must be a valid ICalendar string.
      *
-     * @param string $name
+     * @param string   $name
      * @param resource $calendarData
+     *
      * @return string|null
      */
-    function createFile($name, $calendarData = null) {
-
+    public function createFile($name, $calendarData = null)
+    {
         if (is_resource($calendarData)) {
             $calendarData = stream_get_contents($calendarData);
         }
-        return $this->caldavBackend->createCalendarObject($this->calendarInfo['id'], $name, $calendarData);
 
+        return $this->caldavBackend->createCalendarObject($this->calendarInfo['id'], $name, $calendarData);
     }
 
     /**
      * Deletes the calendar.
-     *
-     * @return void
      */
-    function delete() {
-
+    public function delete()
+    {
         $this->caldavBackend->deleteCalendar($this->calendarInfo['id']);
-
     }
 
     /**
@@ -218,36 +215,30 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      * {DAV:}displayname to display a name to display a name.
      *
      * @param string $newName
-     * @return void
      */
-    function setName($newName) {
-
+    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 null
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         return null;
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->calendarInfo['principaluri'];
-
     }
 
     /**
@@ -262,8 +253,8 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         $acl = [
             [
                 'privilege' => '{DAV:}read',
@@ -272,20 +263,19 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'principal' => $this->getOwner().'/calendar-proxy-write',
                 'protected' => true,
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner() . '/calendar-proxy-read',
+                'principal' => $this->getOwner().'/calendar-proxy-read',
                 'protected' => true,
             ],
             [
-                'privilege' => '{' . Plugin::NS_CALDAV . '}read-free-busy',
+                'privilege' => '{'.Plugin::NS_CALDAV.'}read-free-busy',
                 'principal' => '{DAV:}authenticated',
                 'protected' => true,
             ],
-
         ];
         if (empty($this->calendarInfo['{http://sabredav.org/ns}read-only'])) {
             $acl[] = [
@@ -295,13 +285,12 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
             ];
             $acl[] = [
                 'privilege' => '{DAV:}write',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'principal' => $this->getOwner().'/calendar-proxy-write',
                 'protected' => true,
             ];
         }
 
         return $acl;
-
     }
 
     /**
@@ -311,8 +300,8 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      *
      * @return array
      */
-    function getChildACL() {
-
+    public function getChildACL()
+    {
         $acl = [
             [
                 'privilege' => '{DAV:}read',
@@ -322,15 +311,14 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
 
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'principal' => $this->getOwner().'/calendar-proxy-write',
                 'protected' => true,
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner() . '/calendar-proxy-read',
+                'principal' => $this->getOwner().'/calendar-proxy-read',
                 'protected' => true,
             ],
-
         ];
         if (empty($this->calendarInfo['{http://sabredav.org/ns}read-only'])) {
             $acl[] = [
@@ -340,16 +328,14 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
             ];
             $acl[] = [
                 'privilege' => '{DAV:}write',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'principal' => $this->getOwner().'/calendar-proxy-write',
                 'protected' => true,
             ];
-
         }
-        return $acl;
 
+        return $acl;
     }
 
-
     /**
      * Performs a calendar-query on the contents of this calendar.
      *
@@ -365,12 +351,12 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      * documented by Sabre\CalDAV\CalendarQueryParser.
      *
      * @param array $filters
+     *
      * @return array
      */
-    function calendarQuery(array $filters) {
-
+    public function calendarQuery(array $filters)
+    {
         return $this->caldavBackend->calendarQuery($this->calendarInfo['id'], $filters);
-
     }
 
     /**
@@ -382,8 +368,8 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      *
      * @return string|null
      */
-    function getSyncToken() {
-
+    public function getSyncToken()
+    {
         if (
             $this->caldavBackend instanceof Backend\SyncSupport &&
             isset($this->calendarInfo['{DAV:}sync-token'])
@@ -396,7 +382,6 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
         ) {
             return $this->calendarInfo['{http://sabredav.org/ns}sync-token'];
         }
-
     }
 
     /**
@@ -450,12 +435,13 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
      * The limit is 'suggestive'. You are free to ignore it.
      *
      * @param string $syncToken
-     * @param int $syncLevel
-     * @param int $limit
+     * @param int    $syncLevel
+     * @param int    $limit
+     *
      * @return array
      */
-    function getChanges($syncToken, $syncLevel, $limit = null) {
-
+    public function getChanges($syncToken, $syncLevel, $limit = null)
+    {
         if (!$this->caldavBackend instanceof Backend\SyncSupport) {
             return null;
         }
@@ -466,7 +452,5 @@ class Calendar implements ICalendar, DAV\IProperties, DAV\Sync\ISyncCollection,
             $syncLevel,
             $limit
         );
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/CalendarHome.php b/vendor/sabre/dav/lib/CalDAV/CalendarHome.php
index ffd7f72fb..663d449bf 100644
--- a/vendor/sabre/dav/lib/CalDAV/CalendarHome.php
+++ b/vendor/sabre/dav/lib/CalDAV/CalendarHome.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use Sabre\DAV;
 use Sabre\DAV\Exception\NotFound;
 use Sabre\DAV\MkCol;
 use Sabre\DAVACL;
-use Sabre\HTTP\URLUtil;
+use Sabre\Uri;
 
 /**
  * The CalendarHome represents a node that is usually in a users'
@@ -20,81 +22,74 @@ use Sabre\HTTP\URLUtil;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
-
+class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL
+{
     use DAVACL\ACLTrait;
 
     /**
-     * CalDAV backend
+     * CalDAV backend.
      *
      * @var Backend\BackendInterface
      */
     protected $caldavBackend;
 
     /**
-     * Principal information
+     * Principal information.
      *
      * @var array
      */
     protected $principalInfo;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param Backend\BackendInterface $caldavBackend
-     * @param array $principalInfo
+     * @param array                    $principalInfo
      */
-    function __construct(Backend\BackendInterface $caldavBackend, $principalInfo) {
-
+    public function __construct(Backend\BackendInterface $caldavBackend, $principalInfo)
+    {
         $this->caldavBackend = $caldavBackend;
         $this->principalInfo = $principalInfo;
-
     }
 
     /**
-     * Returns the name of this object
+     * Returns the name of this object.
      *
      * @return string
      */
-    function getName() {
+    public function getName()
+    {
+        list(, $name) = Uri\split($this->principalInfo['uri']);
 
-        list(, $name) = URLUtil::splitPath($this->principalInfo['uri']);
         return $name;
-
     }
 
     /**
-     * Updates the name of this object
+     * Updates the name of this object.
      *
      * @param string $name
-     * @return void
      */
-    function setName($name) {
-
+    public function setName($name)
+    {
         throw new DAV\Exception\Forbidden();
-
     }
 
     /**
-     * Deletes this object
-     *
-     * @return void
+     * Deletes this object.
      */
-    function delete() {
-
+    public function delete()
+    {
         throw new DAV\Exception\Forbidden();
-
     }
 
     /**
-     * Returns the last modification date
+     * Returns the last modification date.
      *
      * @return int
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         return null;
-
     }
 
     /**
@@ -102,14 +97,12 @@ class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * This is currently not allowed
      *
-     * @param string $filename
+     * @param string   $filename
      * @param resource $data
-     * @return void
      */
-    function createFile($filename, $data = null) {
-
+    public function createFile($filename, $data = null)
+    {
         throw new DAV\Exception\MethodNotAllowed('Creating new files in this collection is not supported');
-
     }
 
     /**
@@ -118,30 +111,29 @@ class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
      * This is currently not allowed.
      *
      * @param string $filename
-     * @return void
      */
-    function createDirectory($filename) {
-
+    public 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 calendar, by name.
      *
      * @param string $name
+     *
      * @return Calendar
      */
-    function getChild($name) {
-
+    public function getChild($name)
+    {
         // Special nodes
-        if ($name === 'inbox' && $this->caldavBackend instanceof Backend\SchedulingSupport) {
+        if ('inbox' === $name && $this->caldavBackend instanceof Backend\SchedulingSupport) {
             return new Schedule\Inbox($this->caldavBackend, $this->principalInfo['uri']);
         }
-        if ($name === 'outbox' && $this->caldavBackend instanceof Backend\SchedulingSupport) {
+        if ('outbox' === $name && $this->caldavBackend instanceof Backend\SchedulingSupport) {
             return new Schedule\Outbox($this->principalInfo['uri']);
         }
-        if ($name === 'notifications' && $this->caldavBackend instanceof Backend\NotificationSupport) {
+        if ('notifications' === $name && $this->caldavBackend instanceof Backend\NotificationSupport) {
             return new Notifications\Collection($this->caldavBackend, $this->principalInfo['uri']);
         }
 
@@ -162,36 +154,34 @@ class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
                     return new Subscriptions\Subscription($this->caldavBackend, $subscription);
                 }
             }
-
         }
 
-        throw new NotFound('Node with name \'' . $name . '\' could not be found');
-
+        throw new NotFound('Node with name \''.$name.'\' could not be found');
     }
 
     /**
      * Checks if a calendar exists.
      *
      * @param string $name
+     *
      * @return bool
      */
-    function childExists($name) {
-
+    public function childExists($name)
+    {
         try {
-            return !!$this->getChild($name);
+            return (bool) $this->getChild($name);
         } catch (NotFound $e) {
             return false;
         }
-
     }
 
     /**
-     * Returns a list of calendars
+     * Returns a list of calendars.
      *
      * @return array
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         $calendars = $this->caldavBackend->getCalendarsForUser($this->principalInfo['uri']);
         $objs = [];
         foreach ($calendars as $calendar) {
@@ -220,35 +210,34 @@ class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
         }
 
         return $objs;
-
     }
 
     /**
      * Creates a new calendar or subscription.
      *
      * @param string $name
-     * @param MkCol $mkCol
+     * @param MkCol  $mkCol
+     *
      * @throws DAV\Exception\InvalidResourceType
-     * @return void
      */
-    function createExtendedCollection($name, MkCol $mkCol) {
-
+    public function createExtendedCollection($name, MkCol $mkCol)
+    {
         $isCalendar = false;
         $isSubscription = false;
         foreach ($mkCol->getResourceType() as $rt) {
             switch ($rt) {
-                case '{DAV:}collection' :
-                case '{http://calendarserver.org/ns/}shared-owner' :
+                case '{DAV:}collection':
+                case '{http://calendarserver.org/ns/}shared-owner':
                     // ignore
                     break;
-                case '{urn:ietf:params:xml:ns:caldav}calendar' :
+                case '{urn:ietf:params:xml:ns:caldav}calendar':
                     $isCalendar = true;
                     break;
-                case '{http://calendarserver.org/ns/}subscribed' :
+                case '{http://calendarserver.org/ns/}subscribed':
                     $isSubscription = true;
                     break;
-                default :
-                    throw new DAV\Exception\InvalidResourceType('Unknown resourceType: ' . $rt);
+                default:
+                    throw new DAV\Exception\InvalidResourceType('Unknown resourceType: '.$rt);
             }
         }
 
@@ -260,15 +249,11 @@ class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
                 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');
-
         }
-
     }
 
     /**
@@ -276,10 +261,9 @@ class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return string
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->principalInfo['uri'];
-
     }
 
     /**
@@ -294,8 +278,8 @@ class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         return [
             [
                 'privilege' => '{DAV:}read',
@@ -309,46 +293,43 @@ class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->principalInfo['uri'] . '/calendar-proxy-write',
+                'principal' => $this->principalInfo['uri'].'/calendar-proxy-write',
                 'protected' => true,
             ],
             [
                 'privilege' => '{DAV:}write',
-                'principal' => $this->principalInfo['uri'] . '/calendar-proxy-write',
+                'principal' => $this->principalInfo['uri'].'/calendar-proxy-write',
                 'protected' => true,
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->principalInfo['uri'] . '/calendar-proxy-read',
+                'principal' => $this->principalInfo['uri'].'/calendar-proxy-read',
                 'protected' => true,
             ],
-
         ];
-
     }
 
-
     /**
      * This method is called when a user replied to a request to share.
      *
      * This method should return the url of the newly created calendar if the
      * share was accepted.
      *
-     * @param string $href The sharee who is replying (often a mailto: address)
-     * @param int    $status One of the SharingPlugin::STATUS_* constants
+     * @param string $href        The sharee who is replying (often a mailto: address)
+     * @param int    $status      One of the SharingPlugin::STATUS_* constants
      * @param string $calendarUri The url to the calendar thats being shared
-     * @param string $inReplyTo The unique id this message is a response to
-     * @param string $summary A description of the reply
-     * @return null|string
+     * @param string $inReplyTo   The unique id this message is a response to
+     * @param string $summary     A description of the reply
+     *
+     * @return string|null
      */
-    function shareReply($href, $status, $calendarUri, $inReplyTo, $summary = null) {
-
+    public function shareReply($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.');
         }
 
         return $this->caldavBackend->shareReply($href, $status, $calendarUri, $inReplyTo, $summary);
-
     }
 
     /**
@@ -367,12 +348,11 @@ class CalendarHome implements DAV\IExtendedCollection, DAVACL\IACL {
      * collection should be ignored.
      *
      * @param string $uid
+     *
      * @return string|null
      */
-    function getCalendarObjectByUID($uid) {
-
+    public function getCalendarObjectByUID($uid)
+    {
         return $this->caldavBackend->getCalendarObjectByUID($this->principalInfo['uri'], $uid);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/CalendarObject.php b/vendor/sabre/dav/lib/CalDAV/CalendarObject.php
index 9d6532a35..3f28ee7f7 100644
--- a/vendor/sabre/dav/lib/CalDAV/CalendarObject.php
+++ b/vendor/sabre/dav/lib/CalDAV/CalendarObject.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 /**
@@ -9,33 +11,33 @@ namespace Sabre\CalDAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\DAVACL\IACL {
-
+class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\DAVACL\IACL
+{
     use \Sabre\DAVACL\ACLTrait;
 
     /**
-     * Sabre\CalDAV\Backend\BackendInterface
+     * Sabre\CalDAV\Backend\BackendInterface.
      *
      * @var Backend\AbstractBackend
      */
     protected $caldavBackend;
 
     /**
-     * Array with information about this CalendarObject
+     * Array with information about this CalendarObject.
      *
      * @var array
      */
     protected $objectData;
 
     /**
-     * Array with information about the containing calendar
+     * Array with information about the containing calendar.
      *
      * @var array
      */
     protected $calendarInfo;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * The following properties may be passed within $objectData:
      *
@@ -49,11 +51,11 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *   * acl - (optional) Use this to override the default ACL for the node.
      *
      * @param Backend\BackendInterface $caldavBackend
-     * @param array $calendarInfo
-     * @param array $objectData
+     * @param array                    $calendarInfo
+     * @param array                    $objectData
      */
-    function __construct(Backend\BackendInterface $caldavBackend, array $calendarInfo, array $objectData) {
-
+    public function __construct(Backend\BackendInterface $caldavBackend, array $calendarInfo, array $objectData)
+    {
         $this->caldavBackend = $caldavBackend;
 
         if (!isset($objectData['uri'])) {
@@ -62,44 +64,43 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
 
         $this->calendarInfo = $calendarInfo;
         $this->objectData = $objectData;
-
     }
 
     /**
-     * Returns the uri for this object
+     * Returns the uri for this object.
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return $this->objectData['uri'];
-
     }
 
     /**
-     * Returns the ICalendar-formatted object
+     * Returns the ICalendar-formatted object.
      *
      * @return string
      */
-    function get() {
-
+    public 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->calendarInfo['id'], $this->objectData['uri']);
         }
-        return $this->objectData['calendardata'];
 
+        return $this->objectData['calendardata'];
     }
 
     /**
-     * Updates the ICalendar-formatted object
+     * Updates the ICalendar-formatted object.
      *
      * @param string|resource $calendarData
+     *
      * @return string
      */
-    function put($calendarData) {
-
+    public function put($calendarData)
+    {
         if (is_resource($calendarData)) {
             $calendarData = stream_get_contents($calendarData);
         }
@@ -108,33 +109,29 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
         $this->objectData['etag'] = $etag;
 
         return $etag;
-
     }
 
     /**
-     * Deletes the calendar object
-     *
-     * @return void
+     * Deletes the calendar object.
      */
-    function delete() {
-
+    public function delete()
+    {
         $this->caldavBackend->deleteCalendarObject($this->calendarInfo['id'], $this->objectData['uri']);
-
     }
 
     /**
-     * Returns the mime content-type
+     * Returns the mime content-type.
      *
      * @return string
      */
-    function getContentType() {
-
+    public function getContentType()
+    {
         $mime = 'text/calendar; charset=utf-8';
         if (isset($this->objectData['component']) && $this->objectData['component']) {
-            $mime .= '; component=' . $this->objectData['component'];
+            $mime .= '; component='.$this->objectData['component'];
         }
-        return $mime;
 
+        return $mime;
     }
 
     /**
@@ -144,53 +141,49 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return string
      */
-    function getETag() {
-
+    public function getETag()
+    {
         if (isset($this->objectData['etag'])) {
             return $this->objectData['etag'];
         } else {
-            return '"' . md5($this->get()) . '"';
+            return '"'.md5($this->get()).'"';
         }
-
     }
 
     /**
-     * Returns the last modification date as a unix timestamp
+     * Returns the last modification date as a unix timestamp.
      *
      * @return int
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         return $this->objectData['lastmodified'];
-
     }
 
     /**
-     * Returns the size of this object in bytes
+     * Returns the size of this object in bytes.
      *
      * @return int
      */
-    function getSize() {
-
+    public function getSize()
+    {
         if (array_key_exists('size', $this->objectData)) {
             return $this->objectData['size'];
         } else {
             return strlen($this->get());
         }
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->calendarInfo['principaluri'];
-
     }
 
     /**
@@ -205,8 +198,8 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         // An alternative acl may be specified in the object data.
         if (isset($this->objectData['acl'])) {
             return $this->objectData['acl'];
@@ -221,17 +214,14 @@ class CalendarObject extends \Sabre\DAV\File implements ICalendarObject, \Sabre\
             ],
             [
                 'privilege' => '{DAV:}all',
-                'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
+                'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-write',
                 'protected' => true,
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-read',
+                'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-read',
                 'protected' => true,
             ],
-
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/CalendarQueryValidator.php b/vendor/sabre/dav/lib/CalDAV/CalendarQueryValidator.php
index df8008fe2..0e7f1307d 100644
--- a/vendor/sabre/dav/lib/CalDAV/CalendarQueryValidator.php
+++ b/vendor/sabre/dav/lib/CalDAV/CalendarQueryValidator.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use DateTime;
 use Sabre\VObject;
 
 /**
- * CalendarQuery Validator
+ * CalendarQuery Validator.
  *
  * This class is responsible for checking if an iCalendar object matches a set
  * of filters. The main function to do this is 'validate'.
@@ -18,19 +20,20 @@ use Sabre\VObject;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CalendarQueryValidator {
-
+class CalendarQueryValidator
+{
     /**
-     * Verify if a list of filters applies to the calendar data object
+     * Verify if a list of filters applies to the calendar data object.
      *
      * The list of filters must be formatted as parsed by \Sabre\CalDAV\CalendarQueryParser
      *
      * @param VObject\Component\VCalendar $vObject
-     * @param array $filters
+     * @param array                       $filters
+     *
      * @return bool
      */
-    function validate(VObject\Component\VCalendar $vObject, array $filters) {
-
+    public function validate(VObject\Component\VCalendar $vObject, array $filters)
+    {
         // The top level object is always a component filter.
         // We'll parse it manually, as it's pretty simple.
         if ($vObject->name !== $filters['name']) {
@@ -40,8 +43,6 @@ class CalendarQueryValidator {
         return
             $this->validateCompFilters($vObject, $filters['comp-filters']) &&
             $this->validatePropFilters($vObject, $filters['prop-filters']);
-
-
     }
 
     /**
@@ -52,23 +53,21 @@ class CalendarQueryValidator {
      * itself.
      *
      * @param VObject\Component $parent
-     * @param array $filters
+     * @param array             $filters
+     *
      * @return bool
      */
-    protected function validateCompFilters(VObject\Component $parent, array $filters) {
-
+    protected function validateCompFilters(VObject\Component $parent, array $filters)
+    {
         foreach ($filters as $filter) {
-
             $isDefined = isset($parent->{$filter['name']});
 
             if ($filter['is-not-defined']) {
-
                 if ($isDefined) {
                     return false;
                 } else {
                     continue;
                 }
-
             }
             if (!$isDefined) {
                 return false;
@@ -80,6 +79,7 @@ class CalendarQueryValidator {
                         continue 2;
                     }
                 }
+
                 return false;
             }
 
@@ -90,27 +90,23 @@ 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) {
-
                 if (
                     $this->validateCompFilters($subComponent, $filter['comp-filters']) &&
                     $this->validatePropFilters($subComponent, $filter['prop-filters'])) {
-                        // We had a match, so this comp-filter succeeds
-                        continue 2;
+                    // We had a match, so this comp-filter succeeds
+                    continue 2;
                 }
-
             }
 
             // If we got here it means there were sub-comp-filters or
             // sub-prop-filters and there was no match. This means this filter
             // needs to return false.
             return false;
-
         }
 
         // If we got here it means we got through all comp-filters alive so the
         // filters were all true.
         return true;
-
     }
 
     /**
@@ -121,23 +117,21 @@ class CalendarQueryValidator {
      * itself.
      *
      * @param VObject\Component $parent
-     * @param array $filters
+     * @param array             $filters
+     *
      * @return bool
      */
-    protected function validatePropFilters(VObject\Component $parent, array $filters) {
-
+    protected function validatePropFilters(VObject\Component $parent, array $filters)
+    {
         foreach ($filters as $filter) {
-
             $isDefined = isset($parent->{$filter['name']});
 
             if ($filter['is-not-defined']) {
-
                 if ($isDefined) {
                     return false;
                 } else {
                     continue;
                 }
-
             }
             if (!$isDefined) {
                 return false;
@@ -149,6 +143,7 @@ class CalendarQueryValidator {
                         continue 2;
                     }
                 }
+
                 return false;
             }
 
@@ -159,7 +154,6 @@ 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) {
-
                 if (
                     $this->validateParamFilters($subComponent, $filter['param-filters']) &&
                     (!$filter['text-match'] || $this->validateTextMatch($subComponent, $filter['text-match']))
@@ -167,20 +161,17 @@ class CalendarQueryValidator {
                     // We had a match, so this prop-filter succeeds
                     continue 2;
                 }
-
             }
 
             // If we got here it means there were sub-param-filters or
             // text-match filters and there was no match. This means the
             // filter needs to return false.
             return false;
-
         }
 
         // If we got here it means we got through all prop-filters alive so the
         // filters were all true.
         return true;
-
     }
 
     /**
@@ -191,23 +182,21 @@ class CalendarQueryValidator {
      * itself.
      *
      * @param VObject\Property $parent
-     * @param array $filters
+     * @param array            $filters
+     *
      * @return bool
      */
-    protected function validateParamFilters(VObject\Property $parent, array $filters) {
-
+    protected function validateParamFilters(VObject\Property $parent, array $filters)
+    {
         foreach ($filters as $filter) {
-
             $isDefined = isset($parent[$filter['name']]);
 
             if ($filter['is-not-defined']) {
-
                 if ($isDefined) {
                     return false;
                 } else {
                     continue;
                 }
-
             }
             if (!$isDefined) {
                 return false;
@@ -220,24 +209,20 @@ class CalendarQueryValidator {
             // If there are sub-filters, we need to find at least one parameter
             // for which the subfilters hold true.
             foreach ($parent[$filter['name']]->getParts() as $paramPart) {
-
                 if ($this->validateTextMatch($paramPart, $filter['text-match'])) {
                     // We had a match, so this param-filter succeeds
                     continue 2;
                 }
-
             }
 
             // If we got here it means there was a text-match filter and there
             // were no matches. This means the filter needs to return false.
             return false;
-
         }
 
         // If we got here it means we got through all param-filters alive so the
         // filters were all true.
         return true;
-
     }
 
     /**
@@ -246,20 +231,20 @@ class CalendarQueryValidator {
      * A single text-match should be specified as well as the specific property
      * or parameter we need to validate.
      *
-     * @param VObject\Node|string $check Value to check against.
-     * @param array $textMatch
+     * @param VObject\Node|string $check     value to check against
+     * @param array               $textMatch
+     *
      * @return bool
      */
-    protected function validateTextMatch($check, array $textMatch) {
-
+    protected function validateTextMatch($check, array $textMatch)
+    {
         if ($check instanceof VObject\Node) {
             $check = $check->getValue();
         }
 
         $isMatching = \Sabre\DAV\StringUtil::textMatch($check, $textMatch['value'], $textMatch['collation']);
 
-        return ($textMatch['negate-condition'] xor $isMatching);
-
+        return $textMatch['negate-condition'] xor $isMatching;
     }
 
     /**
@@ -269,12 +254,13 @@ class CalendarQueryValidator {
      * complex.
      *
      * @param VObject\Node $component
-     * @param DateTime $start
-     * @param DateTime $end
+     * @param DateTime     $start
+     * @param DateTime     $end
+     *
      * @return bool
      */
-    protected function validateTimeRange(VObject\Node $component, $start, $end) {
-
+    protected function validateTimeRange(VObject\Node $component, $start, $end)
+    {
         if (is_null($start)) {
             $start = new DateTime('1900-01-01');
         }
@@ -283,14 +269,13 @@ class CalendarQueryValidator {
         }
 
         switch ($component->name) {
-
-            case 'VEVENT' :
-            case 'VTODO' :
-            case 'VJOURNAL' :
+            case 'VEVENT':
+            case 'VTODO':
+            case 'VJOURNAL':
 
                 return $component->isInTimeRange($start, $end);
 
-            case 'VALARM' :
+            case 'VALARM':
 
                 // If the valarm is wrapped in a recurring event, we need to
                 // expand the recursions, and validate each.
@@ -298,10 +283,9 @@ class CalendarQueryValidator {
                 // Our datamodel doesn't easily allow us to do this straight
                 // in the VALARM component code, so this is a hack, and an
                 // expensive one too.
-                if ($component->parent->name === 'VEVENT' && $component->parent->RRULE) {
-
+                if ('VEVENT' === $component->parent->name && $component->parent->RRULE) {
                     // Fire up the iterator!
-                    $it = new VObject\Recur\EventIterator($component->parent->parent, (string)$component->parent->UID);
+                    $it = new VObject\Recur\EventIterator($component->parent->parent, (string) $component->parent->UID);
                     while ($it->valid()) {
                         $expandedEvent = $it->getEventObject();
 
@@ -309,15 +293,14 @@ class CalendarQueryValidator {
                         // one is the first to trigger. Based on this, we can
                         // determine if we can 'give up' expanding events.
                         $firstAlarm = null;
-                        if ($expandedEvent->VALARM !== null) {
+                        if (null !== $expandedEvent->VALARM) {
                             foreach ($expandedEvent->VALARM as $expandedAlarm) {
-
                                 $effectiveTrigger = $expandedAlarm->getEffectiveTriggerTime();
                                 if ($expandedAlarm->isInTimeRange($start, $end)) {
                                     return true;
                                 }
 
-                                if ((string)$expandedAlarm->TRIGGER['VALUE'] === 'DATE-TIME') {
+                                if ('DATE-TIME' === (string) $expandedAlarm->TRIGGER['VALUE']) {
                                     // This is an alarm with a non-relative trigger
                                     // time, likely created by a buggy client. The
                                     // implication is that every alarm in this
@@ -346,30 +329,26 @@ class CalendarQueryValidator {
                         }
                         $it->next();
                     }
+
                     return false;
                 } else {
                     return $component->isInTimeRange($start, $end);
                 }
 
-            case 'VFREEBUSY' :
-                throw new \Sabre\DAV\Exception\NotImplemented('time-range filters are currently not supported on ' . $component->name . ' components');
-
-            case 'COMPLETED' :
-            case 'CREATED' :
-            case 'DTEND' :
-            case 'DTSTAMP' :
-            case 'DTSTART' :
-            case 'DUE' :
-            case 'LAST-MODIFIED' :
-                return ($start <= $component->getDateTime() && $end >= $component->getDateTime());
-
-
-
-            default :
-                throw new \Sabre\DAV\Exception\BadRequest('You cannot create a time-range filter on a ' . $component->name . ' component');
-
+                // no break
+            case 'VFREEBUSY':
+                throw new \Sabre\DAV\Exception\NotImplemented('time-range filters are currently not supported on '.$component->name.' components');
+            case 'COMPLETED':
+            case 'CREATED':
+            case 'DTEND':
+            case 'DTSTAMP':
+            case 'DTSTART':
+            case 'DUE':
+            case 'LAST-MODIFIED':
+                return $start <= $component->getDateTime() && $end >= $component->getDateTime();
+
+            default:
+                throw new \Sabre\DAV\Exception\BadRequest('You cannot create a time-range filter on a '.$component->name.' component');
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/CalendarRoot.php b/vendor/sabre/dav/lib/CalDAV/CalendarRoot.php
index 1d6b2ac9f..42f1a44d5 100644
--- a/vendor/sabre/dav/lib/CalDAV/CalendarRoot.php
+++ b/vendor/sabre/dav/lib/CalDAV/CalendarRoot.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use Sabre\DAVACL\PrincipalBackend;
 
 /**
- * Calendars collection
+ * Calendars collection.
  *
  * This object is responsible for generating a list of calendar-homes for each
  * user.
@@ -17,17 +19,17 @@ use Sabre\DAVACL\PrincipalBackend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CalendarRoot extends \Sabre\DAVACL\AbstractPrincipalCollection {
-
+class CalendarRoot extends \Sabre\DAVACL\AbstractPrincipalCollection
+{
     /**
-     * CalDAV backend
+     * CalDAV backend.
      *
      * @var Backend\BackendInterface
      */
     protected $caldavBackend;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * This constructor needs both an authentication and a caldav backend.
      *
@@ -37,28 +39,26 @@ class CalendarRoot extends \Sabre\DAVACL\AbstractPrincipalCollection {
      * to override this.
      *
      * @param PrincipalBackend\BackendInterface $principalBackend
-     * @param Backend\BackendInterface $caldavBackend
-     * @param string $principalPrefix
+     * @param Backend\BackendInterface          $caldavBackend
+     * @param string                            $principalPrefix
      */
-    function __construct(PrincipalBackend\BackendInterface $principalBackend, Backend\BackendInterface $caldavBackend, $principalPrefix = 'principals') {
-
+    public function __construct(PrincipalBackend\BackendInterface $principalBackend, Backend\BackendInterface $caldavBackend, $principalPrefix = 'principals')
+    {
         parent::__construct($principalBackend, $principalPrefix);
         $this->caldavBackend = $caldavBackend;
-
     }
 
     /**
-     * Returns the nodename
+     * Returns the nodename.
      *
      * We're overriding this, because the default will be the 'principalPrefix',
      * and we want it to be Sabre\CalDAV\Plugin::CALENDAR_ROOT
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return Plugin::CALENDAR_ROOT;
-
     }
 
     /**
@@ -69,12 +69,11 @@ class CalendarRoot extends \Sabre\DAVACL\AbstractPrincipalCollection {
      * supplied by the authentication backend.
      *
      * @param array $principal
+     *
      * @return \Sabre\DAV\INode
      */
-    function getChildForPrincipal(array $principal) {
-
+    public function getChildForPrincipal(array $principal)
+    {
         return new CalendarHome($this->caldavBackend, $principal);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Exception/InvalidComponentType.php b/vendor/sabre/dav/lib/CalDAV/Exception/InvalidComponentType.php
index 7aff2edab..3385ad8fe 100644
--- a/vendor/sabre/dav/lib/CalDAV/Exception/InvalidComponentType.php
+++ b/vendor/sabre/dav/lib/CalDAV/Exception/InvalidComponentType.php
@@ -1,35 +1,34 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Exception;
 
 use Sabre\CalDAV;
 use Sabre\DAV;
 
 /**
- * InvalidComponentType
+ * InvalidComponentType.
  *
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class InvalidComponentType extends DAV\Exception\Forbidden {
-
+class InvalidComponentType extends DAV\Exception\Forbidden
+{
     /**
      * Adds in extra information in the xml response.
      *
      * This method adds the {CALDAV:}supported-calendar-component as defined in rfc4791
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         $doc = $errorNode->ownerDocument;
 
         $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
index fc8b971f3..717d3a9c9 100644
--- a/vendor/sabre/dav/lib/CalDAV/ICSExportPlugin.php
+++ b/vendor/sabre/dav/lib/CalDAV/ICSExportPlugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use DateTime;
@@ -11,7 +13,7 @@ use Sabre\HTTP\ResponseInterface;
 use Sabre\VObject;
 
 /**
- * ICS Exporter
+ * 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
@@ -44,44 +46,49 @@ use Sabre\VObject;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ICSExportPlugin extends DAV\ServerPlugin {
-
+class ICSExportPlugin extends DAV\ServerPlugin
+{
     /**
-     * Reference to Server class
+     * Reference to Server class.
      *
      * @var \Sabre\DAV\Server
      */
     protected $server;
 
     /**
-     * Initializes the plugin and registers event handlers
+     * Initializes the plugin and registers event handlers.
      *
      * @param \Sabre\DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public function initialize(DAV\Server $server)
+    {
         $this->server = $server;
         $server->on('method:GET', [$this, 'httpGet'], 90);
-        $server->on('browserButtonActions', function($path, $node, &$actions) {
+        $server->on('browserButtonActions', function ($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>';
+                $actions .= '<a href="'.htmlspecialchars($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 RequestInterface  $request
      * @param ResponseInterface $response
+     *
+     * @throws BadRequest
+     * @throws DAV\Exception\NotFound
+     * @throws VObject\InvalidDataException
+     *
      * @return bool
      */
-    function httpGet(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpGet(RequestInterface $request, ResponseInterface $response)
+    {
         $queryParams = $request->getQueryParameters();
-        if (!array_key_exists('export', $queryParams)) return;
+        if (!array_key_exists('export', $queryParams)) {
+            return;
+        }
 
         $path = $request->getPath();
 
@@ -93,7 +100,7 @@ class ICSExportPlugin extends DAV\ServerPlugin {
             '{http://apple.com/ns/ical/}calendar-color',
         ]);
 
-        if (!isset($node['{DAV:}resourcetype']) || !$node['{DAV:}resourcetype']->is('{' . Plugin::NS_CALDAV . '}calendar')) {
+        if (!isset($node['{DAV:}resourcetype']) || !$node['{DAV:}resourcetype']->is('{'.Plugin::NS_CALDAV.'}calendar')) {
             return;
         }
         // Marking the transactionType, for logging purposes.
@@ -117,7 +124,7 @@ class ICSExportPlugin extends DAV\ServerPlugin {
             }
             $end = DateTime::createFromFormat('U', $queryParams['end']);
         }
-        if (isset($queryParams['expand']) && !!$queryParams['expand']) {
+        if (isset($queryParams['expand']) && (bool) $queryParams['expand']) {
             if (!$start || !$end) {
                 throw new BadRequest('If you\'d like to expand recurrences, you must specify both a start= and end= parameter.');
             }
@@ -126,12 +133,12 @@ class ICSExportPlugin extends DAV\ServerPlugin {
         }
         if (isset($queryParams['componentType'])) {
             if (!in_array($queryParams['componentType'], ['VEVENT', 'VTODO', 'VJOURNAL'])) {
-                throw new BadRequest('You are not allowed to search for components of type: ' . $queryParams['componentType'] . ' here');
+                throw new BadRequest('You are not allowed to search for components of type: '.$queryParams['componentType'].' here');
             }
             $componentType = $queryParams['componentType'];
         }
 
-        $format = \Sabre\HTTP\Util::Negotiate(
+        $format = \Sabre\HTTP\negotiateContentType(
             $request->getHeader('Accept'),
             [
                 'text/calendar',
@@ -140,7 +147,7 @@ class ICSExportPlugin extends DAV\ServerPlugin {
         );
 
         if (isset($queryParams['accept'])) {
-            if ($queryParams['accept'] === 'application/calendar+json' || $queryParams['accept'] === 'jcal') {
+            if ('application/calendar+json' === $queryParams['accept'] || 'jcal' === $queryParams['accept']) {
                 $format = 'application/calendar+json';
             }
         }
@@ -152,61 +159,61 @@ class ICSExportPlugin extends DAV\ServerPlugin {
 
         // 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 string            $path
+     * @param DateTime|null     $start
+     * @param DateTime|null     $end
+     * @param bool              $expand
+     * @param string            $componentType
+     * @param string            $format
+     * @param array             $properties
      * @param ResponseInterface $response
+     *
+     * @throws DAV\Exception\NotFound
+     * @throws VObject\InvalidDataException
      */
-    protected function generateResponse($path, $start, $end, $expand, $componentType, $format, $properties, ResponseInterface $response) {
-
-        $calDataProp = '{' . Plugin::NS_CALDAV . '}calendar-data';
+    protected function generateResponse($path, $start, $end, $expand, $componentType, $format, $properties, ResponseInterface $response)
+    {
+        $calDataProp = '{'.Plugin::NS_CALDAV.'}calendar-data';
         $calendarNode = $this->server->tree->getNodeForPath($path);
 
         $blobs = [];
         if ($start || $end || $componentType) {
-
             // If there was a start or end filter, we need to enlist
             // calendarQuery for speed.
             $queryResult = $calendarNode->calendarQuery([
-                'name'         => 'VCALENDAR',
+                'name' => 'VCALENDAR',
                 'comp-filters' => [
                     [
-                        'name'           => $componentType,
-                        'comp-filters'   => [],
-                        'prop-filters'   => [],
+                        'name' => $componentType,
+                        'comp-filters' => [],
+                        'prop-filters' => [],
                         'is-not-defined' => false,
-                        'time-range'     => [
+                        'time-range' => [
                             'start' => $start,
-                            'end'   => $end,
+                            'end' => $end,
                         ],
                     ],
                 ],
-                'prop-filters'   => [],
+                'prop-filters' => [],
                 'is-not-defined' => false,
-                'time-range'     => null,
+                '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 . '/' . $item;
+                function ($item) use ($path) {
+                    return $path.'/'.$item;
                 },
                 $queryResult
             );
             $nodes = $this->server->getPropertiesForMultiplePaths($queryResult, [$calDataProp]);
             unset($queryResult);
-
         } else {
             $nodes = $this->server->getPropertiesForPath($path, [$calDataProp], 1);
         }
@@ -228,7 +235,7 @@ class ICSExportPlugin extends DAV\ServerPlugin {
             $calendarTimeZone = null;
             // We're expanding, and for that we need to figure out the
             // calendar's timezone.
-            $tzProp = '{' . Plugin::NS_CALDAV . '}calendar-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
@@ -249,11 +256,11 @@ class ICSExportPlugin extends DAV\ServerPlugin {
         $filenameExtension = '.ics';
 
         switch ($format) {
-            case 'text/calendar' :
+            case 'text/calendar':
                 $mergedCalendar = $mergedCalendar->serialize();
                 $filenameExtension = '.ics';
                 break;
-            case 'application/calendar+json' :
+            case 'application/calendar+json':
                 $mergedCalendar = json_encode($mergedCalendar->jsonSerialize());
                 $filenameExtension = '.json';
                 break;
@@ -264,29 +271,29 @@ class ICSExportPlugin extends DAV\ServerPlugin {
             '',
             $calendarNode->getName()
         );
-        $filename .= '-' . date('Y-m-d') . $filenameExtension;
+        $filename .= '-'.date('Y-m-d').$filenameExtension;
 
-        $response->setHeader('Content-Disposition', 'attachment; filename="' . $filename . '"');
+        $response->setHeader('Content-Disposition', 'attachment; filename="'.$filename.'"');
         $response->setHeader('Content-Type', $format);
 
         $response->setStatus(200);
         $response->setBody($mergedCalendar);
-
     }
 
     /**
      * Merges all calendar objects, and builds one big iCalendar blob.
      *
-     * @param array $properties Some CalDAV properties
+     * @param array $properties   Some CalDAV properties
      * @param array $inputObjects
+     *
      * @return VObject\Component\VCalendar
      */
-    function mergeObjects(array $properties, array $inputObjects) {
-
+    public 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';
+            $calendar->PRODID = '-//SabreDAV//SabreDAV '.DAV\Version::VERSION.'//EN';
         } else {
             $calendar->PRODID = '-//SabreDAV//SabreDAV//EN';
         }
@@ -303,41 +310,41 @@ class ICSExportPlugin extends DAV\ServerPlugin {
         $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' :
+                    case 'VEVENT':
+                    case 'VTODO':
+                    case 'VJOURNAL':
                         $objects[] = clone $child;
                         break;
 
                     // VTIMEZONE is special, because we need to filter out the duplicates
-                    case 'VTIMEZONE' :
+                    case 'VTIMEZONE':
                         // Naively just checking tzid.
-                        if (in_array((string)$child->TZID, $collectedTimezones)) continue;
+                        if (in_array((string) $child->TZID, $collectedTimezones)) {
+                            break;
+                        }
 
                         $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);
+        foreach ($timezones as $tz) {
+            $calendar->add($tz);
+        }
+        foreach ($objects as $obj) {
+            $calendar->add($obj);
+        }
 
         return $calendar;
-
     }
 
     /**
@@ -348,10 +355,9 @@ class ICSExportPlugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'ics-export';
-
     }
 
     /**
@@ -365,14 +371,12 @@ class ICSExportPlugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Adds the ability to export CalDAV calendars as a single iCalendar file.',
-            'link'        => 'http://sabre.io/dav/ics-export-plugin/',
+            '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
index 7cf4b1256..8636e0bae 100644
--- a/vendor/sabre/dav/lib/CalDAV/ICalendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/ICalendar.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use Sabre\DAVACL;
 
 /**
- * Calendar interface
+ * Calendar interface.
  *
  * Implement this interface to allow a node to be recognized as an calendar.
  *
@@ -13,6 +15,6 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ICalendar extends ICalendarObjectContainer, DAVACL\IACL {
-
+interface ICalendar extends ICalendarObjectContainer, DAVACL\IACL
+{
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/ICalendarObject.php b/vendor/sabre/dav/lib/CalDAV/ICalendarObject.php
index b3a767b74..86d9be634 100644
--- a/vendor/sabre/dav/lib/CalDAV/ICalendarObject.php
+++ b/vendor/sabre/dav/lib/CalDAV/ICalendarObject.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use Sabre\DAV;
 
 /**
- * CalendarObject interface
+ * CalendarObject interface.
  *
  * Extend the ICalendarObject interface to allow your custom nodes to be picked up as
  * CalendarObjects.
@@ -16,6 +18,6 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ICalendarObject extends DAV\IFile {
-
+interface ICalendarObject extends DAV\IFile
+{
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/ICalendarObjectContainer.php b/vendor/sabre/dav/lib/CalDAV/ICalendarObjectContainer.php
index 0308b8a55..d9346f311 100644
--- a/vendor/sabre/dav/lib/CalDAV/ICalendarObjectContainer.php
+++ b/vendor/sabre/dav/lib/CalDAV/ICalendarObjectContainer.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 /**
@@ -15,8 +17,8 @@ namespace Sabre\CalDAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ICalendarObjectContainer extends \Sabre\DAV\ICollection {
-
+interface ICalendarObjectContainer extends \Sabre\DAV\ICollection
+{
     /**
      * Performs a calendar-query on the contents of this calendar.
      *
@@ -32,8 +34,8 @@ interface ICalendarObjectContainer extends \Sabre\DAV\ICollection {
      * documented by \Sabre\CalDAV\CalendarQueryParser.
      *
      * @param array $filters
+     *
      * @return array
      */
-    function calendarQuery(array $filters);
-
+    public function calendarQuery(array $filters);
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/ISharedCalendar.php b/vendor/sabre/dav/lib/CalDAV/ISharedCalendar.php
index 15f3b5335..e3e9a7314 100644
--- a/vendor/sabre/dav/lib/CalDAV/ISharedCalendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/ISharedCalendar.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use Sabre\DAV\Sharing\ISharedNode;
@@ -11,8 +13,8 @@ use Sabre\DAV\Sharing\ISharedNode;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ISharedCalendar extends ISharedNode {
-
+interface ISharedCalendar extends ISharedNode
+{
     /**
      * Marks this calendar as published.
      *
@@ -20,7 +22,6 @@ interface ISharedCalendar extends ISharedNode {
      * subscribable calendar.
      *
      * @param bool $value
-     * @return void
      */
-    function setPublishStatus($value);
+    public function setPublishStatus($value);
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Notifications/Collection.php b/vendor/sabre/dav/lib/CalDAV/Notifications/Collection.php
index 557832a5a..884f205e4 100644
--- a/vendor/sabre/dav/lib/CalDAV/Notifications/Collection.php
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/Collection.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Notifications;
 
 use Sabre\CalDAV;
@@ -20,49 +22,47 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
-
+class Collection extends DAV\Collection implements ICollection, DAVACL\IACL
+{
     use DAVACL\ACLTrait;
 
     /**
-     * The notification backend
+     * The notification backend.
      *
      * @var CalDAV\Backend\NotificationSupport
      */
     protected $caldavBackend;
 
     /**
-     * Principal uri
+     * Principal uri.
      *
      * @var string
      */
     protected $principalUri;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param CalDAV\Backend\NotificationSupport $caldavBackend
-     * @param string $principalUri
+     * @param string                             $principalUri
      */
-    function __construct(CalDAV\Backend\NotificationSupport $caldavBackend, $principalUri) {
-
+    public function __construct(CalDAV\Backend\NotificationSupport $caldavBackend, $principalUri)
+    {
         $this->caldavBackend = $caldavBackend;
         $this->principalUri = $principalUri;
-
     }
 
     /**
-     * Returns all notifications for a principal
+     * Returns all notifications for a principal.
      *
      * @return array
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         $children = [];
         $notifications = $this->caldavBackend->getNotificationsForPrincipal($this->principalUri);
 
         foreach ($notifications as $notification) {
-
             $children[] = new Node(
                 $this->caldavBackend,
                 $this->principalUri,
@@ -71,31 +71,27 @@ class Collection extends DAV\Collection implements ICollection, DAVACL\IACL {
         }
 
         return $children;
-
     }
 
     /**
-     * Returns the name of this object
+     * Returns the name of this object.
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return 'notifications';
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->principalUri;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Notifications/ICollection.php b/vendor/sabre/dav/lib/CalDAV/Notifications/ICollection.php
index 008e87435..b12fb3909 100644
--- a/vendor/sabre/dav/lib/CalDAV/Notifications/ICollection.php
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/ICollection.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Notifications;
 
 use Sabre\DAV;
@@ -18,6 +20,6 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ICollection extends DAV\ICollection {
-
+interface ICollection extends DAV\ICollection
+{
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Notifications/INode.php b/vendor/sabre/dav/lib/CalDAV/Notifications/INode.php
index 783b92be9..c5897ef4e 100644
--- a/vendor/sabre/dav/lib/CalDAV/Notifications/INode.php
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/INode.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Notifications;
 
 use Sabre\CalDAV\Xml\Notification\NotificationInterface;
@@ -18,15 +20,15 @@ use Sabre\CalDAV\Xml\Notification\NotificationInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface INode {
-
+interface INode
+{
     /**
      * This method must return an xml element, using the
      * Sabre\CalDAV\Xml\Notification\NotificationInterface classes.
      *
      * @return NotificationInterface
      */
-    function getNotificationType();
+    public function getNotificationType();
 
     /**
      * Returns the etag for the notification.
@@ -35,6 +37,5 @@ interface INode {
      *
      * @return string
      */
-    function getETag();
-
+    public function getETag();
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Notifications/Node.php b/vendor/sabre/dav/lib/CalDAV/Notifications/Node.php
index ad7ddf8f5..b1ec13ff4 100644
--- a/vendor/sabre/dav/lib/CalDAV/Notifications/Node.php
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/Node.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Notifications;
 
 use Sabre\CalDAV;
@@ -18,55 +20,53 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Node extends DAV\File implements INode, DAVACL\IACL {
-
+class Node extends DAV\File implements INode, DAVACL\IACL
+{
     use DAVACL\ACLTrait;
 
     /**
-     * The notification backend
+     * The notification backend.
      *
      * @var CalDAV\Backend\NotificationSupport
      */
     protected $caldavBackend;
 
     /**
-     * The actual notification
+     * The actual notification.
      *
      * @var NotificationInterface
      */
     protected $notification;
 
     /**
-     * Owner principal of the notification
+     * Owner principal of the notification.
      *
      * @var string
      */
     protected $principalUri;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param CalDAV\Backend\NotificationSupport $caldavBackend
-     * @param string $principalUri
-     * @param NotificationInterface $notification
+     * @param string                             $principalUri
+     * @param NotificationInterface              $notification
      */
-    function __construct(CalDAV\Backend\NotificationSupport $caldavBackend, $principalUri, NotificationInterface $notification) {
-
+    public function __construct(CalDAV\Backend\NotificationSupport $caldavBackend, $principalUri, NotificationInterface $notification)
+    {
         $this->caldavBackend = $caldavBackend;
         $this->principalUri = $principalUri;
         $this->notification = $notification;
-
     }
 
     /**
-     * Returns the path name for this notification
+     * Returns the path name for this notification.
      *
      * @return string
      */
-    function getName() {
-
-        return $this->notification->getId() . '.xml';
-
+    public function getName()
+    {
+        return $this->notification->getId().'.xml';
     }
 
     /**
@@ -76,10 +76,9 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return string
      */
-    function getETag() {
-
+    public function getETag()
+    {
         return $this->notification->getETag();
-
     }
 
     /**
@@ -88,34 +87,28 @@ class Node extends DAV\File implements INode, DAVACL\IACL {
      *
      * @return NotificationInterface
      */
-    function getNotificationType() {
-
+    public function getNotificationType()
+    {
         return $this->notification;
-
     }
 
     /**
-     * Deletes this notification
-     *
-     * @return void
+     * Deletes this notification.
      */
-    function delete() {
-
+    public function delete()
+    {
         $this->caldavBackend->deleteNotification($this->getOwner(), $this->notification);
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->principalUri;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Notifications/Plugin.php b/vendor/sabre/dav/lib/CalDAV/Notifications/Plugin.php
index e742351f5..182b70c8e 100644
--- a/vendor/sabre/dav/lib/CalDAV/Notifications/Plugin.php
+++ b/vendor/sabre/dav/lib/CalDAV/Notifications/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Notifications;
 
 use Sabre\DAV;
@@ -12,7 +14,7 @@ use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
 
 /**
- * Notifications plugin
+ * Notifications plugin.
  *
  * This plugin implements several features required by the caldav-notification
  * draft specification.
@@ -24,10 +26,10 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends ServerPlugin {
-
+class Plugin extends ServerPlugin
+{
     /**
-     * This is the namespace for the proprietary calendarserver extensions
+     * This is the namespace for the proprietary calendarserver extensions.
      */
     const NS_CALENDARSERVER = 'http://calendarserver.org/ns/';
 
@@ -46,10 +48,9 @@ class Plugin extends ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'notifications';
-
     }
 
     /**
@@ -61,58 +62,49 @@ class Plugin extends ServerPlugin {
      * This method should set up the required event subscriptions.
      *
      * @param Server $server
-     * @return void
      */
-    function initialize(Server $server) {
-
+    public function initialize(Server $server)
+    {
         $this->server = $server;
         $server->on('method:GET', [$this, 'httpGet'], 90);
-        $server->on('propFind',   [$this, 'propFind']);
+        $server->on('propFind', [$this, 'propFind']);
 
         $server->xml->namespaceMap[self::NS_CALENDARSERVER] = 'cs';
-        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Notifications\\ICollection'] = '{' . self::NS_CALENDARSERVER . '}notification';
+        $server->resourceTypeMapping['\\Sabre\\CalDAV\\Notifications\\ICollection'] = '{'.self::NS_CALENDARSERVER.'}notification';
 
         array_push($server->protectedProperties,
-            '{' . self::NS_CALENDARSERVER . '}notification-URL',
-            '{' . self::NS_CALENDARSERVER . '}notificationtype'
+            '{'.self::NS_CALENDARSERVER.'}notification-URL',
+            '{'.self::NS_CALENDARSERVER.'}notificationtype'
         );
-
     }
 
     /**
-     * PropFind
+     * PropFind.
      *
-     * @param PropFind $propFind
+     * @param PropFind  $propFind
      * @param BaseINode $node
-     * @return void
      */
-    function propFind(PropFind $propFind, BaseINode $node) {
-
+    public 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) {
+            $propFind->handle('{'.self::NS_CALENDARSERVER.'}notification-URL', function () use ($principalUrl, $caldavPlugin) {
+                $notificationPath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl).'/notifications/';
 
-                $notificationPath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl) . '/notifications/';
                 return new DAV\Xml\Property\Href($notificationPath);
-
             });
-
         }
 
         if ($node instanceof INode) {
-
             $propFind->handle(
-                '{' . self::NS_CALENDARSERVER . '}notificationtype',
+                '{'.self::NS_CALENDARSERVER.'}notificationtype',
                 [$node, 'getNotificationType']
             );
-
         }
-
     }
 
     /**
@@ -121,12 +113,11 @@ class Plugin extends ServerPlugin {
      * We use this to intercept GET calls to notification nodes, and return the
      * proper response.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function httpGet(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpGet(RequestInterface $request, ResponseInterface $response)
+    {
         $path = $request->getPath();
 
         try {
@@ -135,8 +126,9 @@ class Plugin extends ServerPlugin {
             return;
         }
 
-        if (!$node instanceof INode)
+        if (!$node instanceof INode) {
             return;
+        }
 
         $writer = $this->server->xml->getWriter();
         $writer->contextUri = $this->server->getBaseUri();
@@ -153,7 +145,6 @@ class Plugin extends ServerPlugin {
 
         // Return false to break the event chain.
         return false;
-
     }
 
     /**
@@ -167,14 +158,12 @@ class Plugin extends ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Adds support for caldav-notifications, which is required to enable caldav-sharing.',
-            'link'        => 'http://sabre.io/dav/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
index def11d52d..04eaedf73 100644
--- a/vendor/sabre/dav/lib/CalDAV/Plugin.php
+++ b/vendor/sabre/dav/lib/CalDAV/Plugin.php
@@ -1,8 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use DateTimeZone;
+use Sabre\CalDAV\Xml\Request\CalendarMultiGetReport;
 use Sabre\DAV;
 use Sabre\DAV\Exception\BadRequest;
 use Sabre\DAV\INode;
@@ -16,7 +19,7 @@ use Sabre\Uri;
 use Sabre\VObject;
 
 /**
- * CalDAV plugin
+ * CalDAV plugin.
  *
  * This plugin provides functionality added by CalDAV (RFC 4791)
  * It implements new reports, and the MKCALENDAR method.
@@ -25,26 +28,26 @@ use Sabre\VObject;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends DAV\ServerPlugin {
-
+class Plugin extends DAV\ServerPlugin
+{
     /**
-     * This is the official CalDAV namespace
+     * This is the official CalDAV namespace.
      */
     const NS_CALDAV = 'urn:ietf:params:xml:ns:caldav';
 
     /**
-     * This is the namespace for the proprietary calendarserver extensions
+     * 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
+     * that we're stuck with it, but it will have to do for now.
      */
     const CALENDAR_ROOT = 'calendars';
 
     /**
-     * Reference to server object
+     * Reference to server object.
      *
      * @var DAV\Server
      */
@@ -65,14 +68,19 @@ class Plugin extends DAV\ServerPlugin {
      * available for the specified uri.
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getHTTPMethods($uri) {
-
+    public function getHTTPMethods($uri)
+    {
         // The MKCALENDAR is only available on unmapped uri's, whose
         // parents extend IExtendedCollection
         list($parent, $name) = Uri\split($uri);
 
+        if ('' === $uri) {
+            $parent = '';
+        }
+
         $node = $this->server->tree->getNodeForPath($parent);
 
         if ($node instanceof DAV\IExtendedCollection) {
@@ -82,8 +90,8 @@ class Plugin extends DAV\ServerPlugin {
                 return ['MKCALENDAR'];
             }
         }
-        return [];
 
+        return [];
     }
 
     /**
@@ -94,10 +102,11 @@ class Plugin extends DAV\ServerPlugin {
      * a calendar home.
      *
      * @param string $principalUrl
+     *
      * @return string
      */
-    function getCalendarHomeForPrincipal($principalUrl) {
-
+    public 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.
         //
@@ -106,11 +115,14 @@ class Plugin extends DAV\ServerPlugin {
         // 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 . '/' . $parts[1];
+        if (2 !== count($parts)) {
+            return;
+        }
+        if ('principals' !== $parts[0]) {
+            return;
+        }
 
+        return self::CALENDAR_ROOT.'/'.$parts[1];
     }
 
     /**
@@ -118,10 +130,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return ['calendar-access', 'calendar-proxy'];
-
     }
 
     /**
@@ -132,10 +143,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'caldav';
-
     }
 
     /**
@@ -146,19 +156,20 @@ class Plugin extends DAV\ServerPlugin {
      * implement them
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getSupportedReportSet($uri) {
-
+    public 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';
+            $reports[] = '{'.self::NS_CALDAV.'}calendar-multiget';
+            $reports[] = '{'.self::NS_CALDAV.'}calendar-query';
         }
         if ($node instanceof ICalendar) {
-            $reports[] = '{' . self::NS_CALDAV . '}free-busy-query';
+            $reports[] = '{'.self::NS_CALDAV.'}free-busy-query';
         }
         // iCal has a bug where it assumes that sync support is enabled, only
         // if we say we support it on the calendar-home, even though this is
@@ -166,39 +177,38 @@ class Plugin extends DAV\ServerPlugin {
         if ($node instanceof CalendarHome && $this->server->getPlugin('sync')) {
             $reports[] = '{DAV:}sync-collection';
         }
-        return $reports;
 
+        return $reports;
     }
 
     /**
-     * Initializes the plugin
+     * Initializes the plugin.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public 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']);
+        $server->on('method:MKCALENDAR', [$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']);
         $server->on('getSupportedPrivilegeSet', [$this, 'getSupportedPrivilegeSet']);
 
         $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->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';
 
@@ -206,86 +216,84 @@ class Plugin extends DAV\ServerPlugin {
         $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',
+            '{'.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'
-
+            '{'.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';
+            $aclPlugin->principalSearchPropertySet['{'.self::NS_CALDAV.'}calendar-user-address-set'] = 'Calendar address';
         }
     }
 
     /**
-     * This functions handles REPORT requests specific to CalDAV
+     * This functions handles REPORT requests specific to CalDAV.
      *
      * @param string $reportName
-     * @param mixed $report
-     * @param mixed $path
+     * @param mixed  $report
+     * @param mixed  $path
+     *
      * @return bool
      */
-    function report($reportName, $report, $path) {
-
+    public function report($reportName, $report, $path)
+    {
         switch ($reportName) {
-            case '{' . self::NS_CALDAV . '}calendar-multiget' :
+            case '{'.self::NS_CALDAV.'}calendar-multiget':
                 $this->server->transactionType = 'report-calendar-multiget';
                 $this->calendarMultiGetReport($report);
+
                 return false;
-            case '{' . self::NS_CALDAV . '}calendar-query' :
+            case '{'.self::NS_CALDAV.'}calendar-query':
                 $this->server->transactionType = 'report-calendar-query';
                 $this->calendarQueryReport($report);
+
                 return false;
-            case '{' . self::NS_CALDAV . '}free-busy-query' :
+            case '{'.self::NS_CALDAV.'}free-busy-query':
                 $this->server->transactionType = 'report-free-busy-query';
                 $this->freeBusyQueryReport($report);
-                return false;
 
+                return false;
         }
-
-
     }
 
     /**
      * This function handles the MKCALENDAR HTTP method, which creates
      * a new calendar.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpMkCalendar(RequestInterface $request, ResponseInterface $response) {
-
+    public 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, $e);
+                throw new BadRequest($e->getMessage(), 0, $e);
             }
             $properties = $mkcalendar->getProperties();
-
         }
 
         // iCal abuses MKCALENDAR since iCal 10.9.2 to create server-stored
@@ -297,7 +305,7 @@ class Plugin extends DAV\ServerPlugin {
         if (isset($properties['{DAV:}resourcetype'])) {
             $resourceType = $properties['{DAV:}resourcetype']->getValue();
         } else {
-            $resourceType = ['{DAV:}collection','{urn:ietf:params:xml:ns:caldav}calendar'];
+            $resourceType = ['{DAV:}collection', '{urn:ietf:params:xml:ns:caldav}calendar'];
         }
 
         $this->server->createCollection($path, new MkCol($resourceType, $properties));
@@ -310,80 +318,77 @@ class Plugin extends DAV\ServerPlugin {
     }
 
     /**
-     * PropFind
+     * 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
+     * @param DAV\INode    $node
      */
-    function propFind(DAV\PropFind $propFind, DAV\INode $node) {
-
-        $ns = '{' . self::NS_CALDAV . '}';
+    public 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() {
+            $propFind->handle($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() {
+            $propFind->handle($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) {
-
+            $propFind->handle('{'.self::NS_CALDAV.'}calendar-home-set', function () use ($principalUrl) {
                 $calendarHomePath = $this->getCalendarHomeForPrincipal($principalUrl);
-                if (is_null($calendarHomePath)) return null;
-                return new LocalHref($calendarHomePath . '/');
+                if (is_null($calendarHomePath)) {
+                    return null;
+                }
 
+                return new LocalHref($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) {
+            $propFind->handle('{'.self::NS_CALDAV.'}calendar-user-address-set', function () use ($node) {
                 $addresses = $node->getAlternateUriSet();
-                $addresses[] = $this->server->getBaseUri() . $node->getPrincipalUrl() . '/';
+                $addresses[] = $this->server->getBaseUri().$node->getPrincipalUrl().'/';
+
                 return new LocalHref($addresses);
             });
             // 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) {
+            $propFind->handle('{'.self::NS_CALENDARSERVER.'}email-address-set', function () use ($node) {
                 $addresses = $node->getAlternateUriSet();
                 $emails = [];
                 foreach ($addresses as $address) {
-                    if (substr($address, 0, 7) === 'mailto:') {
+                    if ('mailto:' === substr($address, 0, 7)) {
                         $emails[] = substr($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) {
+            $propRead = '{'.self::NS_CALENDARSERVER.'}calendar-proxy-read-for';
+            $propWrite = '{'.self::NS_CALENDARSERVER.'}calendar-proxy-write-for';
 
+            if (404 === $propFind->getStatus($propRead) || 404 === $propFind->getStatus($propWrite)) {
                 $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] . '/';
+                    $listItem = Uri\split($group)[0].'/';
 
                     // If the node is either ap proxy-read or proxy-write
                     // group, we grab the parent principal and add it to the
@@ -394,33 +399,27 @@ class Plugin extends DAV\ServerPlugin {
                     if ($groupNode instanceof Principal\IProxyWrite) {
                         $writeList[] = $listItem;
                     }
-
                 }
 
                 $propFind->set($propRead, new LocalHref($readList));
                 $propFind->set($propWrite, new LocalHref($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) {
+            $propFind->handle('{'.self::NS_CALDAV.'}calendar-data', function () use ($node) {
                 $val = $node->get();
-                if (is_resource($val))
+                if (is_resource($val)) {
                     $val = stream_get_contents($val);
+                }
 
                 // Taking out \r to not screw up the xml output
-                return str_replace("\r", "", $val);
-
+                return str_replace("\r", '', $val);
             });
-
         }
-
     }
 
     /**
@@ -430,11 +429,10 @@ class Plugin extends DAV\ServerPlugin {
      * of urls. Effectively avoiding a lot of redundant requests.
      *
      * @param CalendarMultiGetReport $report
-     * @return void
      */
-    function calendarMultiGetReport($report) {
-
-        $needsJson = $report->contentType === 'application/calendar+json';
+    public function calendarMultiGetReport($report)
+    {
+        $needsJson = 'application/calendar+json' === $report->contentType;
 
         $timeZones = [];
         $propertyList = [];
@@ -445,9 +443,8 @@ class Plugin extends DAV\ServerPlugin {
         );
 
         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 (($needsJson || $report->expand) && isset($objProps[200]['{'.self::NS_CALDAV.'}calendar-data'])) {
+                $vObject = VObject\Reader::read($objProps[200]['{'.self::NS_CALDAV.'}calendar-data']);
 
                 if ($report->expand) {
                     // We're expanding, and for that we need to figure out the
@@ -455,7 +452,7 @@ class Plugin extends DAV\ServerPlugin {
                     list($calendarPath) = Uri\split($uri);
                     if (!isset($timeZones[$calendarPath])) {
                         // Checking the calendar-timezone property.
-                        $tzProp = '{' . self::NS_CALDAV . '}calendar-timezone';
+                        $tzProp = '{'.self::NS_CALDAV.'}calendar-timezone';
                         $tzResult = $this->server->getProperties($calendarPath, [$tzProp]);
                         if (isset($tzResult[$tzProp])) {
                             // This property contains a VCALENDAR with a single
@@ -472,9 +469,9 @@ class Plugin extends DAV\ServerPlugin {
                     $vObject = $vObject->expand($report->expand['start'], $report->expand['end'], $timeZones[$calendarPath]);
                 }
                 if ($needsJson) {
-                    $objProps[200]['{' . self::NS_CALDAV . '}calendar-data'] = json_encode($vObject->jsonSerialize());
+                    $objProps[200]['{'.self::NS_CALDAV.'}calendar-data'] = json_encode($vObject->jsonSerialize());
                 } else {
-                    $objProps[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
+                    $objProps[200]['{'.self::NS_CALDAV.'}calendar-data'] = $vObject->serialize();
                 }
                 // Destroy circular references so PHP will garbage collect the
                 // object.
@@ -482,7 +479,6 @@ class Plugin extends DAV\ServerPlugin {
             }
 
             $propertyList[] = $objProps;
-
         }
 
         $prefer = $this->server->getHTTPPrefer();
@@ -490,24 +486,22 @@ class Plugin extends DAV\ServerPlugin {
         $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'));
-
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($propertyList, 'minimal' === $prefer['return']));
     }
 
     /**
-     * This function handles the calendar-query REPORT
+     * 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) {
-
+    public function calendarQueryReport($report)
+    {
         $path = $this->server->getRequestUri();
 
-        $needsJson = $report->contentType === 'application/calendar+json';
+        $needsJson = 'application/calendar+json' === $report->contentType;
 
         $node = $this->server->tree->getNodeForPath($this->server->getRequestUri());
         $depth = $this->server->getHTTPDepth(0);
@@ -519,7 +513,7 @@ class Plugin extends DAV\ServerPlugin {
         if ($report->expand) {
             // We're expanding, and for that we need to figure out the
             // calendar's timezone.
-            $tzProp = '{' . self::NS_CALDAV . '}calendar-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
@@ -538,13 +532,11 @@ class Plugin extends DAV\ServerPlugin {
 
         // The calendarobject was requested directly. In this case we handle
         // this locally.
-        if ($depth == 0 && $node instanceof ICalendarObject) {
-
+        if (0 == $depth && $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';
 
@@ -566,43 +558,35 @@ class Plugin extends DAV\ServerPlugin {
             // 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());
+                            $properties[200]['{'.self::NS_CALDAV.'}calendar-data'] = json_encode($vObject->jsonSerialize());
                         } elseif ($report->expand) {
-                            $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
+                            $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) {
+        if ($node instanceof ICalendarObjectContainer && 0 === $depth) {
+            if (0 === strpos((string) $this->server->httpRequest->getHeader('User-Agent'), 'MSFT-')) {
                 // 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.
@@ -614,31 +598,28 @@ class Plugin extends DAV\ServerPlugin {
             } 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 && $depth == 1) {
-
+        if ($node instanceof ICalendarObjectContainer && 1 == $depth) {
             $nodePaths = $node->calendarQuery($report->filters);
 
             foreach ($nodePaths as $path) {
-
                 list($properties) =
-                    $this->server->getPropertiesForPath($this->server->getRequestUri() . '/' . $path, $report->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']);
+                    $vObject = VObject\Reader::read($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());
+                        $properties[200]['{'.self::NS_CALDAV.'}calendar-data'] = json_encode($vObject->jsonSerialize());
                     } else {
-                        $properties[200]['{' . self::NS_CALDAV . '}calendar-data'] = $vObject->serialize();
+                        $properties[200]['{'.self::NS_CALDAV.'}calendar-data'] = $vObject->serialize();
                     }
 
                     // Destroy circular references so PHP will garbage collect the
@@ -646,9 +627,7 @@ class Plugin extends DAV\ServerPlugin {
                     $vObject->destroy();
                 }
                 $result[] = $properties;
-
             }
-
         }
 
         $prefer = $this->server->getHTTPPrefer();
@@ -656,8 +635,7 @@ class Plugin extends DAV\ServerPlugin {
         $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'));
-
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($result, 'minimal' === $prefer['return']));
     }
 
     /**
@@ -665,15 +643,14 @@ class Plugin extends DAV\ServerPlugin {
      * response for the CALDAV:free-busy-query REPORT.
      *
      * @param Xml\Request\FreeBusyQueryReport $report
-     * @return void
      */
-    protected function freeBusyQueryReport(Xml\Request\FreeBusyQueryReport $report) {
-
+    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');
+            $acl->checkPrivileges($uri, '{'.self::NS_CALDAV.'}read-free-busy');
         }
 
         $calendar = $this->server->tree->getNodeForPath($uri);
@@ -681,7 +658,7 @@ class Plugin extends DAV\ServerPlugin {
             throw new DAV\Exception\NotImplemented('The free-busy-query REPORT is only implemented on calendars');
         }
 
-        $tzProp = '{' . self::NS_CALDAV . '}calendar-timezone';
+        $tzProp = '{'.self::NS_CALDAV.'}calendar-timezone';
 
         // Figuring out the default timezone for the calendar, for floating
         // times.
@@ -699,26 +676,27 @@ class Plugin extends DAV\ServerPlugin {
         // Doing a calendar-query first, to make sure we get the most
         // performance.
         $urls = $calendar->calendarQuery([
-            'name'         => 'VCALENDAR',
+            'name' => 'VCALENDAR',
             'comp-filters' => [
                 [
-                    'name'           => 'VEVENT',
-                    'comp-filters'   => [],
-                    'prop-filters'   => [],
+                    'name' => 'VEVENT',
+                    'comp-filters' => [],
+                    'prop-filters' => [],
                     'is-not-defined' => false,
-                    'time-range'     => [
+                    'time-range' => [
                         'start' => $report->start,
-                        'end'   => $report->end,
+                        'end' => $report->end,
                     ],
                 ],
             ],
-            'prop-filters'   => [],
+            'prop-filters' => [],
             'is-not-defined' => false,
-            'time-range'     => null,
+            'time-range' => null,
         ]);
 
-        $objects = array_map(function($url) use ($calendar) {
+        $objects = array_map(function ($url) use ($calendar) {
             $obj = $calendar->getChild($url)->get();
+
             return $obj;
         }, $urls);
 
@@ -733,7 +711,6 @@ class Plugin extends DAV\ServerPlugin {
         $this->server->httpResponse->setHeader('Content-Type', 'text/calendar');
         $this->server->httpResponse->setHeader('Content-Length', strlen($result));
         $this->server->httpResponse->setBody($result);
-
     }
 
     /**
@@ -742,17 +719,17 @@ class Plugin extends DAV\ServerPlugin {
      * This plugin uses this method to ensure that CalDAV objects receive
      * valid calendar data.
      *
-     * @param string $path
+     * @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
+     * @param resource  $data
+     * @param bool      $modified should be set to true, if this event handler
+     *                            changed &$data
      */
-    function beforeWriteContent($path, DAV\IFile $node, &$data, &$modified) {
-
-        if (!$node instanceof ICalendarObject)
+    public 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
@@ -760,8 +737,9 @@ class Plugin extends DAV\ServerPlugin {
         list($parent) = Uri\split($path);
         $parentNode = $this->server->tree->getNodeForPath($parent);
 
-        if (!$parentNode instanceof ICalendar)
+        if (!$parentNode instanceof ICalendar) {
             return;
+        }
 
         $this->validateICalendar(
             $data,
@@ -771,7 +749,6 @@ class Plugin extends DAV\ServerPlugin {
             $this->server->httpResponse,
             false
         );
-
     }
 
     /**
@@ -780,17 +757,17 @@ class Plugin extends DAV\ServerPlugin {
      * This plugin uses this method to ensure that newly created calendar
      * objects contain valid calendar data.
      *
-     * @param string $path
-     * @param resource $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
+     * @param bool            $modified   should be set to true, if this event handler
+     *                                    changed &$data
      */
-    function beforeCreateFile($path, &$data, DAV\ICollection $parentNode, &$modified) {
-
-        if (!$parentNode instanceof ICalendar)
+    public function beforeCreateFile($path, &$data, DAV\ICollection $parentNode, &$modified)
+    {
+        if (!$parentNode instanceof ICalendar) {
             return;
+        }
 
         $this->validateICalendar(
             $data,
@@ -800,7 +777,6 @@ class Plugin extends DAV\ServerPlugin {
             $this->server->httpResponse,
             true
         );
-
     }
 
     /**
@@ -808,17 +784,16 @@ class Plugin extends DAV\ServerPlugin {
      *
      * 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
+     * @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              $isNew    is the item a new one, or an update
      */
-    protected function validateICalendar(&$data, $path, &$modified, RequestInterface $request, ResponseInterface $response, $isNew) {
-
+    protected function validateICalendar(&$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);
@@ -827,10 +802,9 @@ class Plugin extends DAV\ServerPlugin {
         $before = $data;
 
         try {
-
             // If the data starts with a [, we can reasonably assume we're dealing
             // with a jCal object.
-            if (substr($data, 0, 1) === '[') {
+            if ('[' === substr($data, 0, 1)) {
                 $vobj = VObject\Reader::readJson($data);
 
                 // Converting $data back to iCalendar, as that's what we
@@ -840,14 +814,11 @@ class Plugin extends DAV\ServerPlugin {
             } 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: ' . $e->getMessage());
-
+            throw new DAV\Exception\UnsupportedMediaType('This resource only supports valid iCalendar 2.0 data. Parse error: '.$e->getMessage());
         }
 
-        if ($vobj->name !== 'VCALENDAR') {
+        if ('VCALENDAR' !== $vobj->name) {
             throw new DAV\Exception\UnsupportedMediaType('This collection can only support iCalendar objects.');
         }
 
@@ -867,25 +838,24 @@ class Plugin extends DAV\ServerPlugin {
 
         foreach ($vobj->getComponents() as $component) {
             switch ($component->name) {
-                case 'VTIMEZONE' :
+                case 'VTIMEZONE':
                     continue 2;
-                case 'VEVENT' :
-                case 'VTODO' :
-                case 'VJOURNAL' :
+                case 'VEVENT':
+                case 'VTODO':
+                case 'VJOURNAL':
                     $foundType = $component->name;
                     break;
             }
-
         }
 
         if (!$foundType || !in_array($foundType, $supportedComponents)) {
-            throw new Exception\InvalidComponentType('iCalendar objects must at least have a component of type ' . implode(', ', $supportedComponents));
+            throw new Exception\InvalidComponentType('iCalendar objects must at least have a component of type '.implode(', ', $supportedComponents));
         }
 
         $options = VObject\Node::PROFILE_CALDAV;
         $prefer = $this->server->getHTTPPrefer();
 
-        if ($prefer['handling'] !== 'strict') {
+        if ('strict' !== $prefer['handling']) {
             $options |= VObject\Node::REPAIR;
         }
 
@@ -897,32 +867,28 @@ class Plugin extends DAV\ServerPlugin {
         // $messages contains a list of problems with the vcard, along with
         // their severity.
         foreach ($messages as $message) {
-
             if ($message['level'] > $highestLevel) {
                 // Recording the highest reported error level.
                 $highestLevel = $message['level'];
                 $warningMessage = $message['message'];
             }
             switch ($message['level']) {
-
-                case 1 :
+                case 1:
                     // Level 1 means that there was a problem, but it was repaired.
                     $modified = true;
                     break;
-                case 2 :
+                case 2:
                     // Level 2 means a warning, but not critical
                     break;
-                case 3 :
+                case 3:
                     // Level 3 means a critical error
-                    throw new DAV\Exception\UnsupportedMediaType('Validation error in iCalendar: ' . $message['message']);
-
+                    throw new DAV\Exception\UnsupportedMediaType('Validation error in iCalendar: '.$message['message']);
             }
-
         }
         if ($warningMessage) {
             $response->setHeader(
                 'X-Sabre-Ew-Gross',
-                'iCalendar validation warning: ' . $warningMessage
+                'iCalendar validation warning: '.$warningMessage
             );
         }
 
@@ -940,7 +906,7 @@ class Plugin extends DAV\ServerPlugin {
                 $vobj,
                 $parentPath,
                 &$subModified,
-                $isNew
+                $isNew,
             ]
         );
 
@@ -949,15 +915,13 @@ class Plugin extends DAV\ServerPlugin {
             $data = $vobj->serialize();
 
             // Using md5 to figure out if there was an *actual* change.
-            if (!$modified && strcmp($data, $before) !== 0) {
+            if (!$modified && 0 !== strcmp($data, $before)) {
                 $modified = true;
             }
-
         }
 
         // Destroy circular references so PHP will garbage collect the object.
         $vobj->destroy();
-
     }
 
     /**
@@ -967,11 +931,11 @@ class Plugin extends DAV\ServerPlugin {
      * @param INode $node
      * @param array $supportedPrivilegeSet
      */
-    function getSupportedPrivilegeSet(INode $node, array &$supportedPrivilegeSet) {
-
+    public function getSupportedPrivilegeSet(INode $node, array &$supportedPrivilegeSet)
+    {
         if ($node instanceof ICalendar) {
-            $supportedPrivilegeSet['{DAV:}read']['aggregates']['{' . self::NS_CALDAV . '}read-free-busy'] = [
-                'abstract'   => false,
+            $supportedPrivilegeSet['{DAV:}read']['aggregates']['{'.self::NS_CALDAV.'}read-free-busy'] = [
+                'abstract' => false,
                 'aggregates' => [],
             ];
         }
@@ -983,18 +947,20 @@ class Plugin extends DAV\ServerPlugin {
      * can use to create new calendars.
      *
      * @param DAV\INode $node
-     * @param string $output
+     * @param string    $output
+     *
      * @return bool
      */
-    function htmlActionsPanel(DAV\INode $node, &$output) {
-
-        if (!$node instanceof CalendarHome)
+    public 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" />
+            <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" />
@@ -1002,7 +968,6 @@ class Plugin extends DAV\ServerPlugin {
             </td></tr>';
 
         return false;
-
     }
 
     /**
@@ -1010,22 +975,22 @@ class Plugin extends DAV\ServerPlugin {
      *
      * This is used to transform data into jCal, if this was requested.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function httpAfterGet(RequestInterface $request, ResponseInterface $response) {
-
-        if (strpos($response->getHeader('Content-Type'), 'text/calendar') === false) {
+    public function httpAfterGet(RequestInterface $request, ResponseInterface $response)
+    {
+        $contentType = $response->getHeader('Content-Type');
+        if (null === $contentType || false === strpos($contentType, 'text/calendar')) {
             return;
         }
 
-        $result = HTTP\Util::negotiate(
+        $result = HTTP\negotiateContentType(
             $request->getHeader('Accept'),
             ['text/calendar', 'application/calendar+json']
         );
 
-        if ($result !== 'application/calendar+json') {
+        if ('application/calendar+json' !== $result) {
             // Do nothing
             return;
         }
@@ -1041,7 +1006,6 @@ class Plugin extends DAV\ServerPlugin {
 
         $response->setHeader('Content-Type', 'application/calendar+json');
         $response->setHeader('Content-Length', strlen($jsonBody));
-
     }
 
     /**
@@ -1055,14 +1019,12 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Adds support for CalDAV (rfc4791)',
-            'link'        => 'http://sabre.io/dav/caldav/',
+            'link' => 'http://sabre.io/dav/caldav/',
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Principal/Collection.php b/vendor/sabre/dav/lib/CalDAV/Principal/Collection.php
index e19719a76..cae29c752 100644
--- a/vendor/sabre/dav/lib/CalDAV/Principal/Collection.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/Collection.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Principal;
 
 use Sabre\DAVACL;
 
 /**
- * Principal collection
+ * Principal collection.
  *
  * This is an alternative collection to the standard ACL principal collection.
  * This collection adds support for the calendar-proxy-read and
@@ -16,18 +18,17 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Collection extends DAVACL\PrincipalCollection {
-
+class Collection extends DAVACL\PrincipalCollection
+{
     /**
-     * Returns a child object based on principal information
+     * Returns a child object based on principal information.
      *
      * @param array $principalInfo
+     *
      * @return User
      */
-    function getChildForPrincipal(array $principalInfo) {
-
+    public function getChildForPrincipal(array $principalInfo)
+    {
         return new User($this->principalBackend, $principalInfo);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Principal/IProxyRead.php b/vendor/sabre/dav/lib/CalDAV/Principal/IProxyRead.php
index 7dd375932..96e6991c5 100644
--- a/vendor/sabre/dav/lib/CalDAV/Principal/IProxyRead.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/IProxyRead.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Principal;
 
 use Sabre\DAVACL;
 
 /**
- * ProxyRead principal interface
+ * ProxyRead principal interface.
  *
  * Any principal node implementing this interface will be picked up as a 'proxy
  * principal group'.
@@ -14,6 +16,6 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IProxyRead extends DAVACL\IPrincipal {
-
+interface IProxyRead extends DAVACL\IPrincipal
+{
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Principal/IProxyWrite.php b/vendor/sabre/dav/lib/CalDAV/Principal/IProxyWrite.php
index eda87a4ff..2556039ca 100644
--- a/vendor/sabre/dav/lib/CalDAV/Principal/IProxyWrite.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/IProxyWrite.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Principal;
 
 use Sabre\DAVACL;
 
 /**
- * ProxyWrite principal interface
+ * ProxyWrite principal interface.
  *
  * Any principal node implementing this interface will be picked up as a 'proxy
  * principal group'.
@@ -14,6 +16,6 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IProxyWrite extends DAVACL\IPrincipal {
-
+interface IProxyWrite extends DAVACL\IPrincipal
+{
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Principal/ProxyRead.php b/vendor/sabre/dav/lib/CalDAV/Principal/ProxyRead.php
index e3881831e..1b24984bd 100644
--- a/vendor/sabre/dav/lib/CalDAV/Principal/ProxyRead.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/ProxyRead.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Principal;
 
 use Sabre\DAV;
 use Sabre\DAVACL;
 
 /**
- * ProxyRead principal
+ * ProxyRead principal.
  *
  * This class represents a principal group, hosted under the main principal.
  * This is needed to implement 'Calendar delegation' support. This class is
@@ -16,8 +18,8 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ProxyRead implements IProxyRead {
-
+class ProxyRead implements IProxyRead
+{
     /**
      * Principal information from the parent principal.
      *
@@ -26,7 +28,7 @@ class ProxyRead implements IProxyRead {
     protected $principalInfo;
 
     /**
-     * Principal backend
+     * Principal backend.
      *
      * @var DAVACL\PrincipalBackend\BackendInterface
      */
@@ -38,13 +40,12 @@ class ProxyRead implements IProxyRead {
      * Note that you MUST supply the parent principal information.
      *
      * @param DAVACL\PrincipalBackend\BackendInterface $principalBackend
-     * @param array $principalInfo
+     * @param array                                    $principalInfo
      */
-    function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, array $principalInfo) {
-
+    public function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, array $principalInfo)
+    {
         $this->principalInfo = $principalInfo;
         $this->principalBackend = $principalBackend;
-
     }
 
     /**
@@ -52,103 +53,91 @@ class ProxyRead implements IProxyRead {
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return 'calendar-proxy-read';
-
     }
 
     /**
-     * Returns the last modification time
-     *
-     * @return null
+     * Returns the last modification time.
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         return null;
-
     }
 
     /**
-     * Deletes the current node
+     * Deletes the current node.
      *
      * @throws DAV\Exception\Forbidden
-     * @return void
      */
-    function delete() {
-
+    public function delete()
+    {
         throw new DAV\Exception\Forbidden('Permission denied to delete node');
-
     }
 
     /**
-     * Renames the node
+     * Renames the node.
      *
      * @param string $name The new name
+     *
      * @throws DAV\Exception\Forbidden
-     * @return void
      */
-    function setName($name) {
-
+    public function setName($name)
+    {
         throw new DAV\Exception\Forbidden('Permission denied to rename file');
-
     }
 
-
     /**
-     * Returns a list of alternative urls for a principal
+     * Returns a list of alternative urls for a principal.
      *
      * This can for example be an email address, or ldap url.
      *
      * @return array
      */
-    function getAlternateUriSet() {
-
+    public function getAlternateUriSet()
+    {
         return [];
-
     }
 
     /**
-     * Returns the full principal url
+     * Returns the full principal url.
      *
      * @return string
      */
-    function getPrincipalUrl() {
-
-        return $this->principalInfo['uri'] . '/' . $this->getName();
-
+    public function getPrincipalUrl()
+    {
+        return $this->principalInfo['uri'].'/'.$this->getName();
     }
 
     /**
-     * Returns the list of group members
+     * Returns the list of group members.
      *
      * If this principal is a group, this function should return
      * all member principal uri's for the group.
      *
      * @return array
      */
-    function getGroupMemberSet() {
-
+    public function getGroupMemberSet()
+    {
         return $this->principalBackend->getGroupMemberSet($this->getPrincipalUrl());
-
     }
 
     /**
-     * Returns the list of groups this principal is member of
+     * Returns the list of groups this principal is member of.
      *
      * If this principal is a member of a (list of) groups, this function
      * should return a list of principal uri's for it's members.
      *
      * @return array
      */
-    function getGroupMembership() {
-
+    public function getGroupMembership()
+    {
         return $this->principalBackend->getGroupMembership($this->getPrincipalUrl());
-
     }
 
     /**
-     * Sets a list of group members
+     * Sets a list of group members.
      *
      * If this principal is a group, this method sets all the group members.
      * The list of members is always overwritten, never appended to.
@@ -156,26 +145,22 @@ class ProxyRead implements IProxyRead {
      * This method should throw an exception if the members could not be set.
      *
      * @param array $principals
-     * @return void
      */
-    function setGroupMemberSet(array $principals) {
-
+    public function setGroupMemberSet(array $principals)
+    {
         $this->principalBackend->setGroupMemberSet($this->getPrincipalUrl(), $principals);
-
     }
 
     /**
-     * Returns the displayname
+     * Returns the displayname.
      *
      * This should be a human readable name for the principal.
      * If none is available, return the nodename.
      *
      * @return string
      */
-    function getDisplayName() {
-
+    public function getDisplayName()
+    {
         return $this->getName();
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Principal/ProxyWrite.php b/vendor/sabre/dav/lib/CalDAV/Principal/ProxyWrite.php
index 43dd9bf07..7b9c78e0a 100644
--- a/vendor/sabre/dav/lib/CalDAV/Principal/ProxyWrite.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/ProxyWrite.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Principal;
 
 use Sabre\DAV;
 use Sabre\DAVACL;
 
 /**
- * ProxyWrite principal
+ * ProxyWrite principal.
  *
  * This class represents a principal group, hosted under the main principal.
  * This is needed to implement 'Calendar delegation' support. This class is
@@ -16,35 +18,34 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ProxyWrite implements IProxyWrite {
-
+class ProxyWrite implements IProxyWrite
+{
     /**
-     * Parent principal information
+     * Parent principal information.
      *
      * @var array
      */
     protected $principalInfo;
 
     /**
-     * Principal Backend
+     * Principal Backend.
      *
      * @var DAVACL\PrincipalBackend\BackendInterface
      */
     protected $principalBackend;
 
     /**
-     * Creates the object
+     * Creates the object.
      *
      * Note that you MUST supply the parent principal information.
      *
      * @param DAVACL\PrincipalBackend\BackendInterface $principalBackend
-     * @param array $principalInfo
+     * @param array                                    $principalInfo
      */
-    function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, array $principalInfo) {
-
+    public function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, array $principalInfo)
+    {
         $this->principalInfo = $principalInfo;
         $this->principalBackend = $principalBackend;
-
     }
 
     /**
@@ -52,103 +53,91 @@ class ProxyWrite implements IProxyWrite {
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return 'calendar-proxy-write';
-
     }
 
     /**
-     * Returns the last modification time
-     *
-     * @return null
+     * Returns the last modification time.
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         return null;
-
     }
 
     /**
-     * Deletes the current node
+     * Deletes the current node.
      *
      * @throws DAV\Exception\Forbidden
-     * @return void
      */
-    function delete() {
-
+    public function delete()
+    {
         throw new DAV\Exception\Forbidden('Permission denied to delete node');
-
     }
 
     /**
-     * Renames the node
+     * Renames the node.
      *
      * @param string $name The new name
+     *
      * @throws DAV\Exception\Forbidden
-     * @return void
      */
-    function setName($name) {
-
+    public function setName($name)
+    {
         throw new DAV\Exception\Forbidden('Permission denied to rename file');
-
     }
 
-
     /**
-     * Returns a list of alternative urls for a principal
+     * Returns a list of alternative urls for a principal.
      *
      * This can for example be an email address, or ldap url.
      *
      * @return array
      */
-    function getAlternateUriSet() {
-
+    public function getAlternateUriSet()
+    {
         return [];
-
     }
 
     /**
-     * Returns the full principal url
+     * Returns the full principal url.
      *
      * @return string
      */
-    function getPrincipalUrl() {
-
-        return $this->principalInfo['uri'] . '/' . $this->getName();
-
+    public function getPrincipalUrl()
+    {
+        return $this->principalInfo['uri'].'/'.$this->getName();
     }
 
     /**
-     * Returns the list of group members
+     * Returns the list of group members.
      *
      * If this principal is a group, this function should return
      * all member principal uri's for the group.
      *
      * @return array
      */
-    function getGroupMemberSet() {
-
+    public function getGroupMemberSet()
+    {
         return $this->principalBackend->getGroupMemberSet($this->getPrincipalUrl());
-
     }
 
     /**
-     * Returns the list of groups this principal is member of
+     * Returns the list of groups this principal is member of.
      *
      * If this principal is a member of a (list of) groups, this function
      * should return a list of principal uri's for it's members.
      *
      * @return array
      */
-    function getGroupMembership() {
-
+    public function getGroupMembership()
+    {
         return $this->principalBackend->getGroupMembership($this->getPrincipalUrl());
-
     }
 
     /**
-     * Sets a list of group members
+     * Sets a list of group members.
      *
      * If this principal is a group, this method sets all the group members.
      * The list of members is always overwritten, never appended to.
@@ -156,26 +145,22 @@ class ProxyWrite implements IProxyWrite {
      * This method should throw an exception if the members could not be set.
      *
      * @param array $principals
-     * @return void
      */
-    function setGroupMemberSet(array $principals) {
-
+    public function setGroupMemberSet(array $principals)
+    {
         $this->principalBackend->setGroupMemberSet($this->getPrincipalUrl(), $principals);
-
     }
 
     /**
-     * Returns the displayname
+     * Returns the displayname.
      *
      * This should be a human readable name for the principal.
      * If none is available, return the nodename.
      *
      * @return string
      */
-    function getDisplayName() {
-
+    public function getDisplayName()
+    {
         return $this->getName();
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Principal/User.php b/vendor/sabre/dav/lib/CalDAV/Principal/User.php
index 6e97e7cca..88bf4b4f7 100644
--- a/vendor/sabre/dav/lib/CalDAV/Principal/User.php
+++ b/vendor/sabre/dav/lib/CalDAV/Principal/User.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Principal;
 
 use Sabre\DAV;
 use Sabre\DAVACL;
 
 /**
- * CalDAV principal
+ * CalDAV principal.
  *
  * This is a standard user-principal for CalDAV. This principal is also a
  * collection and returns the caldav-proxy-read and caldav-proxy-write child
@@ -16,91 +18,91 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class User extends DAVACL\Principal implements DAV\ICollection {
-
+class User extends DAVACL\Principal implements DAV\ICollection
+{
     /**
-     * Creates a new file in the directory
+     * Creates a new file in the directory.
+     *
+     * @param string   $name Name of the file
+     * @param resource $data initial payload, passed as a readable stream resource
      *
-     * @param string $name Name of the file
-     * @param resource $data Initial payload, passed as a readable stream resource.
      * @throws DAV\Exception\Forbidden
-     * @return void
      */
-    function createFile($name, $data = null) {
-
-        throw new DAV\Exception\Forbidden('Permission denied to create file (filename ' . $name . ')');
-
+    public function createFile($name, $data = null)
+    {
+        throw new DAV\Exception\Forbidden('Permission denied to create file (filename '.$name.')');
     }
 
     /**
-     * Creates a new subdirectory
+     * Creates a new subdirectory.
      *
      * @param string $name
+     *
      * @throws DAV\Exception\Forbidden
-     * @return void
      */
-    function createDirectory($name) {
-
+    public function createDirectory($name)
+    {
         throw new DAV\Exception\Forbidden('Permission denied to create directory');
-
     }
 
     /**
-     * Returns a specific child node, referenced by its name
+     * Returns a specific child node, referenced by its name.
      *
      * @param string $name
+     *
      * @return DAV\INode
      */
-    function getChild($name) {
-
-        $principal = $this->principalBackend->getPrincipalByPath($this->getPrincipalURL() . '/' . $name);
+    public function getChild($name)
+    {
+        $principal = $this->principalBackend->getPrincipalByPath($this->getPrincipalURL().'/'.$name);
         if (!$principal) {
-            throw new DAV\Exception\NotFound('Node with name ' . $name . ' was not found');
+            throw new DAV\Exception\NotFound('Node with name '.$name.' was not found');
         }
-        if ($name === 'calendar-proxy-read')
+        if ('calendar-proxy-read' === $name) {
             return new ProxyRead($this->principalBackend, $this->principalProperties);
+        }
 
-        if ($name === 'calendar-proxy-write')
+        if ('calendar-proxy-write' === $name) {
             return new ProxyWrite($this->principalBackend, $this->principalProperties);
+        }
 
-        throw new DAV\Exception\NotFound('Node with name ' . $name . ' was not found');
-
+        throw new DAV\Exception\NotFound('Node with name '.$name.' was not found');
     }
 
     /**
-     * Returns an array with all the child nodes
+     * Returns an array with all the child nodes.
      *
      * @return DAV\INode[]
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         $r = [];
-        if ($this->principalBackend->getPrincipalByPath($this->getPrincipalURL() . '/calendar-proxy-read')) {
+        if ($this->principalBackend->getPrincipalByPath($this->getPrincipalURL().'/calendar-proxy-read')) {
             $r[] = new ProxyRead($this->principalBackend, $this->principalProperties);
         }
-        if ($this->principalBackend->getPrincipalByPath($this->getPrincipalURL() . '/calendar-proxy-write')) {
+        if ($this->principalBackend->getPrincipalByPath($this->getPrincipalURL().'/calendar-proxy-write')) {
             $r[] = new ProxyWrite($this->principalBackend, $this->principalProperties);
         }
 
         return $r;
-
     }
 
     /**
-     * Returns whether or not the child node exists
+     * Returns whether or not the child node exists.
      *
      * @param string $name
+     *
      * @return bool
      */
-    function childExists($name) {
-
+    public function childExists($name)
+    {
         try {
             $this->getChild($name);
+
             return true;
         } catch (DAV\Exception\NotFound $e) {
             return false;
         }
-
     }
 
     /**
@@ -115,21 +117,20 @@ class User extends DAVACL\Principal implements DAV\ICollection {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         $acl = parent::getACL();
         $acl[] = [
             'privilege' => '{DAV:}read',
-            'principal' => $this->principalProperties['uri'] . '/calendar-proxy-read',
+            'principal' => $this->principalProperties['uri'].'/calendar-proxy-read',
             'protected' => true,
         ];
         $acl[] = [
             'privilege' => '{DAV:}read',
-            'principal' => $this->principalProperties['uri'] . '/calendar-proxy-write',
+            'principal' => $this->principalProperties['uri'].'/calendar-proxy-write',
             'protected' => true,
         ];
-        return $acl;
 
+        return $acl;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/IInbox.php b/vendor/sabre/dav/lib/CalDAV/Schedule/IInbox.php
index c9fd77d93..64a94becc 100644
--- a/vendor/sabre/dav/lib/CalDAV/Schedule/IInbox.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/IInbox.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Schedule;
 
 /**
@@ -10,6 +12,6 @@ namespace Sabre\CalDAV\Schedule;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IInbox extends \Sabre\CalDAV\ICalendarObjectContainer, \Sabre\DAVACL\IACL {
-
+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
index 6f5acb29a..d71b3c0f8 100644
--- a/vendor/sabre/dav/lib/CalDAV/Schedule/IMipPlugin.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/IMipPlugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Schedule;
 
 use Sabre\DAV;
@@ -19,8 +21,8 @@ use Sabre\VObject\ITip;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class IMipPlugin extends DAV\ServerPlugin {
-
+class IMipPlugin extends DAV\ServerPlugin
+{
     /**
      * Email address used in From: header.
      *
@@ -29,7 +31,7 @@ class IMipPlugin extends DAV\ServerPlugin {
     protected $senderEmail;
 
     /**
-     * ITipMessage
+     * ITipMessage.
      *
      * @var ITip\Message
      */
@@ -43,10 +45,9 @@ class IMipPlugin extends DAV\ServerPlugin {
      *                             generally be some kind of no-reply email
      *                             address you own.
      */
-    function __construct($senderEmail) {
-
+    public function __construct($senderEmail)
+    {
         $this->senderEmail = $senderEmail;
-
     }
 
     /*
@@ -60,10 +61,9 @@ class IMipPlugin extends DAV\ServerPlugin {
      * @param DAV\Server $server
      * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public function initialize(DAV\Server $server)
+    {
         $server->on('schedule', [$this, 'schedule'], 120);
-
     }
 
     /**
@@ -74,67 +74,68 @@ class IMipPlugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'imip';
-
     }
 
     /**
      * Event handler for the 'schedule' event.
      *
      * @param ITip\Message $iTipMessage
-     * @return void
      */
-    function schedule(ITip\Message $iTipMessage) {
-
+    public 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($iTipMessage->sender, PHP_URL_SCHEME) !== 'mailto')
+        if ('mailto' !== parse_url($iTipMessage->sender, PHP_URL_SCHEME)) {
             return;
+        }
 
-        if (parse_url($iTipMessage->recipient, PHP_URL_SCHEME) !== 'mailto')
+        if ('mailto' !== parse_url($iTipMessage->recipient, PHP_URL_SCHEME)) {
             return;
+        }
 
         $sender = substr($iTipMessage->sender, 7);
         $recipient = substr($iTipMessage->recipient, 7);
 
         if ($iTipMessage->senderName) {
-            $sender = $iTipMessage->senderName . ' <' . $sender . '>';
+            $sender = $iTipMessage->senderName.' <'.$sender.'>';
         }
-        if ($iTipMessage->recipientName) {
-            $recipient = $iTipMessage->recipientName . ' <' . $recipient . '>';
+        if ($iTipMessage->recipientName && $iTipMessage->recipientName != $recipient) {
+            $recipient = $iTipMessage->recipientName.' <'.$recipient.'>';
         }
 
         $subject = 'SabreDAV iTIP message';
         switch (strtoupper($iTipMessage->method)) {
-            case 'REPLY' :
-                $subject = 'Re: ' . $summary;
+            case 'REPLY':
+                $subject = 'Re: '.$summary;
                 break;
-            case 'REQUEST' :
-                $subject = $summary;
+            case 'REQUEST':
+                $subject = 'Invitation: '.$summary;
                 break;
-            case 'CANCEL' :
-                $subject = 'Cancelled: ' . $summary;
+            case 'CANCEL':
+                $subject = 'Cancelled: '.$summary;
                 break;
         }
 
         $headers = [
-            'Reply-To: ' . $sender,
-            'From: ' . $this->senderEmail,
-            'Content-Type: text/calendar; charset=UTF-8; method=' . $iTipMessage->method,
+            'Reply-To: '.$sender,
+            'From: '.$iTipMessage->senderName.' <'.$this->senderEmail.'>',
+            'Content-Type: text/calendar; charset=UTF-8; method='.$iTipMessage->method,
         ];
         if (DAV\Server::$exposeVersion) {
-            $headers[] = 'X-Sabre-Version: ' . DAV\Version::VERSION;
+            $headers[] = 'X-Sabre-Version: '.DAV\Version::VERSION;
         }
         $this->mail(
             $recipient,
@@ -143,7 +144,6 @@ class IMipPlugin extends DAV\ServerPlugin {
             $headers
         );
         $iTipMessage->scheduleStatus = '1.1; Scheduling message is sent via iMip';
-
     }
 
     // @codeCoverageIgnoreStart
@@ -152,16 +152,14 @@ class IMipPlugin extends DAV\ServerPlugin {
     /**
      * This function is responsible for sending the actual email.
      *
-     * @param string $to Recipient email address
+     * @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
+     * @param string $body    iCalendar body
+     * @param array  $headers List of headers
      */
-    protected function mail($to, $subject, $body, array $headers) {
-
+    protected function mail($to, $subject, $body, array $headers)
+    {
         mail($to, $subject, $body, implode("\r\n", $headers));
-
     }
 
     // @codeCoverageIgnoreEnd
@@ -177,14 +175,12 @@ class IMipPlugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Email delivery (rfc6047) for CalDAV scheduling',
-            'link'        => 'http://sabre.io/dav/scheduling/',
+            'link' => 'http://sabre.io/dav/scheduling/',
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/IOutbox.php b/vendor/sabre/dav/lib/CalDAV/Schedule/IOutbox.php
index 88fbdc411..384b503df 100644
--- a/vendor/sabre/dav/lib/CalDAV/Schedule/IOutbox.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/IOutbox.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Schedule;
 
 /**
@@ -10,6 +12,6 @@ namespace Sabre\CalDAV\Schedule;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IOutbox extends \Sabre\DAV\ICollection, \Sabre\DAVACL\IACL {
-
+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
index b37cb40a1..345b55d9f 100644
--- a/vendor/sabre/dav/lib/CalDAV/Schedule/ISchedulingObject.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/ISchedulingObject.php
@@ -1,13 +1,15 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Schedule;
 
 /**
- * The SchedulingObject represents a scheduling object in the Inbox collection
+ * 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 {
-
+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
index 81b017307..d92f1dd4c 100644
--- a/vendor/sabre/dav/lib/CalDAV/Schedule/Inbox.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/Inbox.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Schedule;
 
 use Sabre\CalDAV;
@@ -9,41 +11,40 @@ use Sabre\DAVACL;
 use Sabre\VObject;
 
 /**
- * The CalDAV scheduling inbox
+ * 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 {
-
+class Inbox extends DAV\Collection implements IInbox
+{
     use DAVACL\ACLTrait;
 
     /**
-     * CalDAV backend
+     * CalDAV backend.
      *
      * @var Backend\BackendInterface
      */
     protected $caldavBackend;
 
     /**
-     * The principal Uri
+     * The principal Uri.
      *
      * @var string
      */
     protected $principalUri;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param Backend\SchedulingSupport $caldavBackend
-     * @param string $principalUri
+     * @param string                    $principalUri
      */
-    function __construct(Backend\SchedulingSupport $caldavBackend, $principalUri) {
-
+    public function __construct(Backend\SchedulingSupport $caldavBackend, $principalUri)
+    {
         $this->caldavBackend = $caldavBackend;
         $this->principalUri = $principalUri;
-
     }
 
     /**
@@ -53,19 +54,18 @@ class Inbox extends DAV\Collection implements IInbox {
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return 'inbox';
-
     }
 
     /**
-     * Returns an array with all the child nodes
+     * Returns an array with all the child nodes.
      *
      * @return \Sabre\DAV\INode[]
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         $objs = $this->caldavBackend->getSchedulingObjects($this->principalUri);
         $children = [];
         foreach ($objs as $obj) {
@@ -73,12 +73,12 @@ class Inbox extends DAV\Collection implements IInbox {
             $obj['principaluri'] = $this->principalUri;
             $children[] = new SchedulingObject($this->caldavBackend, $obj);
         }
-        return $children;
 
+        return $children;
     }
 
     /**
-     * Creates a new file in the directory
+     * 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.
@@ -97,27 +97,26 @@ class Inbox extends DAV\Collection implements IInbox {
      * 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 string          $name Name of the file
      * @param resource|string $data Initial payload
-     * @return null|string
+     *
+     * @return string|null
      */
-    function createFile($name, $data = null) {
-
+    public function createFile($name, $data = null)
+    {
         $this->caldavBackend->createSchedulingObject($this->principalUri, $name, $data);
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->principalUri;
-
     }
 
     /**
@@ -132,8 +131,8 @@ class Inbox extends DAV\Collection implements IInbox {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         return [
             [
                 'privilege' => '{DAV:}read',
@@ -152,16 +151,15 @@ class Inbox extends DAV\Collection implements IInbox {
             ],
             [
                 'privilege' => '{DAV:}unbind',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'principal' => $this->getOwner().'/calendar-proxy-write',
                 'protected' => true,
             ],
             [
-                'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-deliver',
+                'privilege' => '{'.CalDAV\Plugin::NS_CALDAV.'}schedule-deliver',
                 'principal' => '{DAV:}authenticated',
                 'protected' => true,
             ],
         ];
-
     }
 
     /**
@@ -179,10 +177,11 @@ class Inbox extends DAV\Collection implements IInbox {
      * documented by \Sabre\CalDAV\CalendarQueryParser.
      *
      * @param array $filters
+     *
      * @return array
      */
-    function calendarQuery(array $filters) {
-
+    public function calendarQuery(array $filters)
+    {
         $result = [];
         $validator = new CalDAV\CalendarQueryValidator();
 
@@ -196,8 +195,7 @@ class Inbox extends DAV\Collection implements IInbox {
             // Destroy circular references to PHP will GC the object.
             $vObject->destroy();
         }
-        return $result;
 
+        return $result;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/Outbox.php b/vendor/sabre/dav/lib/CalDAV/Schedule/Outbox.php
index 888ea3086..1442c4cc6 100644
--- a/vendor/sabre/dav/lib/CalDAV/Schedule/Outbox.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/Outbox.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Schedule;
 
 use Sabre\CalDAV;
@@ -7,7 +9,7 @@ use Sabre\DAV;
 use Sabre\DAVACL;
 
 /**
- * The CalDAV scheduling outbox
+ * The CalDAV scheduling outbox.
  *
  * The outbox is mainly used as an endpoint in the tree for a client to do
  * free-busy requests. This functionality is completely handled by the
@@ -17,26 +19,25 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Outbox extends DAV\Collection implements IOutbox {
-
+class Outbox extends DAV\Collection implements IOutbox
+{
     use DAVACL\ACLTrait;
 
     /**
-     * The principal Uri
+     * The principal Uri.
      *
      * @var string
      */
     protected $principalUri;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param string $principalUri
      */
-    function __construct($principalUri) {
-
+    public function __construct($principalUri)
+    {
         $this->principalUri = $principalUri;
-
     }
 
     /**
@@ -46,34 +47,31 @@ class Outbox extends DAV\Collection implements IOutbox {
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return 'outbox';
-
     }
 
     /**
-     * Returns an array with all the child nodes
+     * Returns an array with all the child nodes.
      *
      * @return \Sabre\DAV\INode[]
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         return [];
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->principalUri;
-
     }
 
     /**
@@ -88,11 +86,11 @@ class Outbox extends DAV\Collection implements IOutbox {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         return [
             [
-                'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-send',
+                'privilege' => '{'.CalDAV\Plugin::NS_CALDAV.'}schedule-send',
                 'principal' => $this->getOwner(),
                 'protected' => true,
             ],
@@ -102,22 +100,20 @@ class Outbox extends DAV\Collection implements IOutbox {
                 'protected' => true,
             ],
             [
-                'privilege' => '{' . CalDAV\Plugin::NS_CALDAV . '}schedule-send',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'privilege' => '{'.CalDAV\Plugin::NS_CALDAV.'}schedule-send',
+                'principal' => $this->getOwner().'/calendar-proxy-write',
                 'protected' => true,
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner() . '/calendar-proxy-read',
+                'principal' => $this->getOwner().'/calendar-proxy-read',
                 'protected' => true,
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'principal' => $this->getOwner().'/calendar-proxy-write',
                 'protected' => true,
             ],
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php b/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php
index 0b991e619..d2c9b68e9 100644
--- a/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Schedule;
 
 use DateTimeZone;
@@ -28,7 +30,7 @@ use Sabre\VObject\Reader;
 
 /**
  * CalDAV scheduling plugin.
- * =========================
+ * =========================.
  *
  * This plugin provides the functionality added by the "Scheduling Extensions
  * to CalDAV" standard, as defined in RFC6638.
@@ -53,10 +55,10 @@ use Sabre\VObject\Reader;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends ServerPlugin {
-
+class Plugin extends ServerPlugin
+{
     /**
-     * This is the official CalDAV namespace
+     * This is the official CalDAV namespace.
      */
     const NS_CALDAV = 'urn:ietf:params:xml:ns:caldav';
 
@@ -72,10 +74,9 @@ class Plugin extends ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return ['calendar-auto-schedule', 'calendar-availability'];
-
     }
 
     /**
@@ -86,49 +87,46 @@ class Plugin extends ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'caldav-schedule';
-
     }
 
     /**
-     * Initializes the plugin
+     * Initializes the plugin.
      *
      * @param Server $server
-     * @return void
      */
-    function initialize(Server $server) {
-
+    public 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']);
+        $server->on('method:POST', [$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']);
         $server->on('getSupportedPrivilegeSet', [$this, 'getSupportedPrivilegeSet']);
 
-        $ns = '{' . self::NS_CALDAV . '}';
+        $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';
+        $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'
+            $ns.'schedule-inbox-URL',
+            $ns.'schedule-outbox-URL',
+            $ns.'calendar-user-address-set',
+            $ns.'calendar-user-type',
+            $ns.'schedule-default-calendar-URL'
         );
-
     }
 
     /**
@@ -139,10 +137,11 @@ class Plugin extends ServerPlugin {
      * available for the specified uri.
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getHTTPMethods($uri) {
-
+    public function getHTTPMethods($uri)
+    {
         try {
             $node = $this->server->tree->getNodeForPath($uri);
         } catch (NotFound $e) {
@@ -154,21 +153,21 @@ class Plugin extends ServerPlugin {
         }
 
         return [];
-
     }
 
     /**
      * This method handles POST request for the outbox.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpPost(RequestInterface $request, ResponseInterface $response) {
-
+    public 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) {
+        if (!$contentType || 0 !== strpos($contentType, 'text/calendar')) {
             return;
         }
 
@@ -180,8 +179,9 @@ class Plugin extends ServerPlugin {
         } catch (NotFound $e) {
             return;
         }
-        if (!$node instanceof IOutbox)
+        if (!$node instanceof IOutbox) {
             return;
+        }
 
         $this->server->transactionType = 'post-caldav-outbox';
         $this->outboxRequest($node, $request, $response);
@@ -189,7 +189,6 @@ class Plugin extends ServerPlugin {
         // Returning false breaks the event chain and tells the server we've
         // handled the request.
         return false;
-
     }
 
     /**
@@ -198,43 +197,36 @@ class Plugin extends ServerPlugin {
      * We use this event to add calendar-auto-schedule-specific properties.
      *
      * @param PropFind $propFind
-     * @param INode $node
-     * @return void
+     * @param INode    $node
      */
-    function propFind(PropFind $propFind, INode $node) {
-
+    public 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) {
-
+            $propFind->handle('{'.self::NS_CALDAV.'}schedule-outbox-URL', function () use ($principalUrl, $caldavPlugin) {
                 $calendarHomePath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl);
                 if (!$calendarHomePath) {
                     return null;
                 }
-                $outboxPath = $calendarHomePath . '/outbox/';
+                $outboxPath = $calendarHomePath.'/outbox/';
 
                 return new LocalHref($outboxPath);
-
             });
             // schedule-inbox-URL property
-            $propFind->handle('{' . self::NS_CALDAV . '}schedule-inbox-URL', function() use ($principalUrl, $caldavPlugin) {
-
+            $propFind->handle('{'.self::NS_CALDAV.'}schedule-inbox-URL', function () use ($principalUrl, $caldavPlugin) {
                 $calendarHomePath = $caldavPlugin->getCalendarHomeForPrincipal($principalUrl);
                 if (!$calendarHomePath) {
                     return null;
                 }
-                $inboxPath = $calendarHomePath . '/inbox/';
+                $inboxPath = $calendarHomePath.'/inbox/';
 
                 return new LocalHref($inboxPath);
-
             });
 
-            $propFind->handle('{' . self::NS_CALDAV . '}schedule-default-calendar-URL', function() use ($principalUrl, $caldavPlugin) {
-
+            $propFind->handle('{'.self::NS_CALDAV.'}schedule-default-calendar-URL', function () use ($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);
@@ -243,7 +235,7 @@ class Plugin extends ServerPlugin {
                     return null;
                 }
 
-                $sccs = '{' . self::NS_CALDAV . '}supported-calendar-component-set';
+                $sccs = '{'.self::NS_CALDAV.'}supported-calendar-component-set';
 
                 $result = $this->server->getPropertiesForPath($calendarHomePath, [
                     '{DAV:}resourcetype',
@@ -252,18 +244,17 @@ class Plugin extends ServerPlugin {
                 ], 1);
 
                 foreach ($result as $child) {
-                    if (!isset($child[200]['{DAV:}resourcetype']) || !$child[200]['{DAV:}resourcetype']->is('{' . self::NS_CALDAV . '}calendar')) {
+                    if (!isset($child[200]['{DAV:}resourcetype']) || !$child[200]['{DAV:}resourcetype']->is('{'.self::NS_CALDAV.'}calendar')) {
                         // Node is either not a calendar
                         continue;
                     }
                     if (isset($child[200]['{DAV:}share-access'])) {
                         $shareAccess = $child[200]['{DAV:}share-access']->getValue();
-                        if ($shareAccess !== Sharing\Plugin::ACCESS_NOTSHARED && $shareAccess !== Sharing\Plugin::ACCESS_SHAREDOWNER) {
+                        if (Sharing\Plugin::ACCESS_NOTSHARED !== $shareAccess && Sharing\Plugin::ACCESS_SHAREDOWNER !== $shareAccess) {
                             // Node is a shared node, not owned by the relevant
                             // user.
                             continue;
                         }
-
                     }
                     if (!isset($child[200][$sccs]) || in_array('VEVENT', $child[200][$sccs]->getValue())) {
                         // Either there is no supported-calendar-component-set
@@ -271,82 +262,70 @@ class Plugin extends ServerPlugin {
                         return new LocalHref($child['href']);
                     }
                 }
-
             });
 
             // The server currently reports every principal to be of type
             // 'INDIVIDUAL'
-            $propFind->handle('{' . self::NS_CALDAV . '}calendar-user-type', function() {
-
+            $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
+        $propFind->handle('{http://calendarserver.org/ns/}calendar-availability', function () use ($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(
+            $availProp = '{'.self::NS_CALDAV.'}calendar-availability';
+            $subPropFind = new PropFind(
                  $propFind->getPath(),
                  [$availProp]
              );
 
-             $this->server->getPropertiesByNode(
+            $this->server->getPropertiesByNode(
                  $subPropFind,
                  $node
              );
 
-             $propFind->set(
+            $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 string    $path
      * @param PropPatch $propPatch
-     * @return void
      */
-    function propPatch($path, PropPatch $propPatch) {
-
+    public function propPatch($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';
+        $propPatch->handle('{http://calendarserver.org/ns/}calendar-availability', function ($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
+     * @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
      */
-    function calendarObjectChange(RequestInterface $request, ResponseInterface $response, VCalendar $vCal, $calendarPath, &$modified, $isNew) {
-
+    public function calendarObjectChange(RequestInterface $request, ResponseInterface $response, VCalendar $vCal, $calendarPath, &$modified, $isNew)
+    {
         if (!$this->scheduleReply($this->server->httpRequest)) {
             return;
         }
@@ -370,17 +349,15 @@ class Plugin extends ServerPlugin {
             // 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) {
-
+    public function deliver(ITip\Message $iTipMessage)
+    {
         $this->server->emit('schedule', [$iTipMessage]);
         if (!$iTipMessage->scheduleStatus) {
             $iTipMessage->scheduleStatus = '5.2;There was no system capable of delivering the scheduling message';
@@ -391,7 +368,6 @@ class Plugin extends ServerPlugin {
         if (!$iTipMessage->significantChange && in_array($baseCode, ['3', '5'])) {
             $iTipMessage->scheduleStatus = null;
         }
-
     }
 
     /**
@@ -401,13 +377,14 @@ class Plugin extends ServerPlugin {
      * cancellations, and organizers get 'DECLINED' statuses.
      *
      * @param string $path
-     * @return void
      */
-    function beforeUnbind($path) {
-
+    public 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;
+        if ('MOVE' === $this->server->httpRequest->getMethod()) {
+            return;
+        }
 
         $node = $this->server->tree->getNodeForPath($path);
 
@@ -429,7 +406,6 @@ class Plugin extends ServerPlugin {
         foreach ($messages as $message) {
             $this->deliver($message);
         }
-
     }
 
     /**
@@ -439,10 +415,9 @@ class Plugin extends ServerPlugin {
      * scheduling object.
      *
      * @param ITip\Message $iTipMessage
-     * @return void
      */
-    function scheduleLocalDelivery(ITip\Message $iTipMessage) {
-
+    public function scheduleLocalDelivery(ITip\Message $iTipMessage)
+    {
         $aclPlugin = $this->server->getPlugin('acl');
 
         // Local delivery is not available if the ACL plugin is not loaded.
@@ -450,11 +425,12 @@ class Plugin extends ServerPlugin {
             return;
         }
 
-        $caldavNS = '{' . self::NS_CALDAV . '}';
+        $caldavNS = '{'.self::NS_CALDAV.'}';
 
         $principalUri = $aclPlugin->getPrincipalByUri($iTipMessage->recipient);
         if (!$principalUri) {
             $iTipMessage->scheduleStatus = '3.7;Could not find principal.';
+
             return;
         }
 
@@ -470,9 +446,9 @@ class Plugin extends ServerPlugin {
             $principalUri,
             [
                 '{DAV:}principal-URL',
-                 $caldavNS . 'calendar-home-set',
-                 $caldavNS . 'schedule-inbox-URL',
-                 $caldavNS . 'schedule-default-calendar-URL',
+                 $caldavNS.'calendar-home-set',
+                 $caldavNS.'schedule-inbox-URL',
+                 $caldavNS.'schedule-default-calendar-URL',
                 '{http://sabredav.org/ns}email-address',
             ]
         );
@@ -480,31 +456,35 @@ class Plugin extends ServerPlugin {
         // Re-registering the ACL event
         $this->server->on('propFind', [$aclPlugin, 'propFind'], 20);
 
-        if (!isset($result[$caldavNS . 'schedule-inbox-URL'])) {
+        if (!isset($result[$caldavNS.'schedule-inbox-URL'])) {
             $iTipMessage->scheduleStatus = '5.2;Could not find local inbox';
+
             return;
         }
-        if (!isset($result[$caldavNS . 'calendar-home-set'])) {
+        if (!isset($result[$caldavNS.'calendar-home-set'])) {
             $iTipMessage->scheduleStatus = '5.2;Could not locate a calendar-home-set';
+
             return;
         }
-        if (!isset($result[$caldavNS . 'schedule-default-calendar-URL'])) {
+        if (!isset($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();
+        $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') {
+        if ('REPLY' === $iTipMessage->method) {
             $privilege = 'schedule-deliver-reply';
         } else {
             $privilege = 'schedule-deliver-invite';
         }
 
-        if (!$aclPlugin->checkPrivileges($inboxPath, $caldavNS . $privilege, DAVACL\Plugin::R_PARENT, false)) {
-            $iTipMessage->scheduleStatus = '3.8;insufficient privileges: ' . $privilege . ' is required on the recipient schedule inbox.';
+        if (!$aclPlugin->checkPrivileges($inboxPath, $caldavNS.$privilege, DAVACL\Plugin::R_PARENT, false)) {
+            $iTipMessage->scheduleStatus = '3.8;insufficient privileges: '.$privilege.' is required on the recipient schedule inbox.';
+
             return;
         }
 
@@ -512,7 +492,7 @@ class Plugin extends ServerPlugin {
         // the users' calendars.
         $uid = $iTipMessage->uid;
 
-        $newFileName = 'sabredav-' . \Sabre\DAV\UUIDUtil::getUUID() . '.ics';
+        $newFileName = 'sabredav-'.\Sabre\DAV\UUIDUtil::getUUID().'.ics';
 
         $home = $this->server->tree->getNodeForPath($homePath);
         $inbox = $this->server->tree->getNodeForPath($inboxPath);
@@ -524,7 +504,7 @@ class Plugin extends ServerPlugin {
         $result = $home->getCalendarObjectByUID($uid);
         if ($result) {
             // There was an existing object, we need to update probably.
-            $objectPath = $homePath . '/' . $result;
+            $objectPath = $homePath.'/'.$result;
             $objectNode = $this->server->tree->getNodeForPath($objectPath);
             $oldICalendarData = $objectNode->get();
             $currentObject = Reader::read($oldICalendarData);
@@ -545,6 +525,7 @@ class Plugin extends ServerPlugin {
             // 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;
         }
 
@@ -558,7 +539,7 @@ class Plugin extends ServerPlugin {
             // 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') {
+            if ('REPLY' === $iTipMessage->method) {
                 $this->processICalendarChange(
                     $oldICalendarData,
                     $newObject,
@@ -569,7 +550,6 @@ class Plugin extends ServerPlugin {
             $objectNode->put($newObject->serialize());
         }
         $iTipMessage->scheduleStatus = '1.2;Message delivered locally';
-
     }
 
     /**
@@ -581,54 +561,53 @@ class Plugin extends ServerPlugin {
      * @param INode $node
      * @param array $supportedPrivilegeSet
      */
-    function getSupportedPrivilegeSet(INode $node, array &$supportedPrivilegeSet) {
-
-        $ns = '{' . self::NS_CALDAV . '}';
+    public function getSupportedPrivilegeSet(INode $node, array &$supportedPrivilegeSet)
+    {
+        $ns = '{'.self::NS_CALDAV.'}';
         if ($node instanceof IOutbox) {
-            $supportedPrivilegeSet[$ns . 'schedule-send'] = [
-                'abstract'   => false,
+            $supportedPrivilegeSet[$ns.'schedule-send'] = [
+                'abstract' => false,
                 'aggregates' => [
-                    $ns . 'schedule-send-invite' => [
-                        'abstract'   => false,
+                    $ns.'schedule-send-invite' => [
+                        'abstract' => false,
                         'aggregates' => [],
                     ],
-                    $ns . 'schedule-send-reply' => [
-                        'abstract'   => false,
+                    $ns.'schedule-send-reply' => [
+                        'abstract' => false,
                         'aggregates' => [],
                     ],
-                    $ns . 'schedule-send-freebusy' => [
-                        'abstract'   => false,
+                    $ns.'schedule-send-freebusy' => [
+                        'abstract' => false,
                         'aggregates' => [],
                     ],
                     // Privilege from an earlier scheduling draft, but still
                     // used by some clients.
-                    $ns . 'schedule-post-vevent' => [
-                        'abstract'   => false,
+                    $ns.'schedule-post-vevent' => [
+                        'abstract' => false,
                         'aggregates' => [],
                     ],
-                ]
+                ],
             ];
         }
         if ($node instanceof IInbox) {
-            $supportedPrivilegeSet[$ns . 'schedule-deliver'] = [
-                'abstract'   => false,
+            $supportedPrivilegeSet[$ns.'schedule-deliver'] = [
+                'abstract' => false,
                 'aggregates' => [
-                    $ns . 'schedule-deliver-invite' => [
-                        'abstract'   => false,
+                    $ns.'schedule-deliver-invite' => [
+                        'abstract' => false,
                         'aggregates' => [],
                     ],
-                    $ns . 'schedule-deliver-reply' => [
-                        'abstract'   => false,
+                    $ns.'schedule-deliver-reply' => [
+                        'abstract' => false,
                         'aggregates' => [],
                     ],
-                    $ns . 'schedule-query-freebusy' => [
-                        'abstract'   => false,
+                    $ns.'schedule-query-freebusy' => [
+                        'abstract' => false,
                         'aggregates' => [],
                     ],
-                ]
+                ],
             ];
         }
-
     }
 
     /**
@@ -642,22 +621,22 @@ class Plugin extends ServerPlugin {
      * 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
+     * @param VCalendar        $newObject
+     * @param array            $addresses
+     * @param array            $ignore    any addresses to not send messages to
+     * @param bool             $modified  a marker to indicate that the original object
+     *                                    modified by this process
      */
-    protected function processICalendarChange($oldObject = null, VCalendar $newObject, array $addresses, array $ignore = [], &$modified = false) {
-
+    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) $modified = true;
+        if ($messages) {
+            $modified = true;
+        }
 
         foreach ($messages as $message) {
-
             if (in_array($message->recipient, $ignore)) {
                 continue;
             }
@@ -669,36 +648,32 @@ class Plugin extends ServerPlugin {
                     $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'] = $message->getScheduleStatus();
+                if (isset($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;
                         }
-                        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) {
-
-        $CUAS = '{' . self::NS_CALDAV . '}calendar-user-address-set';
+    protected function getAddressesForPrincipal($principal)
+    {
+        $CUAS = '{'.self::NS_CALDAV.'}calendar-user-address-set';
 
         $properties = $this->server->getProperties(
             $principal,
@@ -707,12 +682,12 @@ class Plugin extends ServerPlugin {
 
         // If we can't find this information, we'll stop processing
         if (!isset($properties[$CUAS])) {
-            return;
+            return [];
         }
 
         $addresses = $properties[$CUAS]->getHrefs();
-        return $addresses;
 
+        return $addresses;
     }
 
     /**
@@ -726,20 +701,19 @@ class Plugin extends ServerPlugin {
      * extensions, but iCal depends on a feature from that spec, so we
      * implement it.
      *
-     * @param IOutbox $outboxNode
-     * @param RequestInterface $request
+     * @param IOutbox           $outboxNode
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function outboxRequest(IOutbox $outboxNode, RequestInterface $request, ResponseInterface $response) {
-
+    public 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: ' . $e->getMessage());
+            throw new BadRequest('The request body must be a valid iCalendar object. Parse error: '.$e->getMessage());
         }
 
         // The incoming iCalendar object must have a METHOD property, and a
@@ -747,7 +721,7 @@ class Plugin extends ServerPlugin {
         // this is.
         $componentType = null;
         foreach ($vObject->getComponents() as $component) {
-            if ($component->name !== 'VTIMEZONE') {
+            if ('VTIMEZONE' !== $component->name) {
                 $componentType = $component->name;
                 break;
             }
@@ -757,7 +731,7 @@ class Plugin extends ServerPlugin {
         }
 
         // Validating the METHOD
-        $method = strtoupper((string)$vObject->METHOD);
+        $method = strtoupper((string) $vObject->METHOD);
         if (!$method) {
             throw new BadRequest('A METHOD property must be specified in iTIP messages');
         }
@@ -768,46 +742,42 @@ class Plugin extends ServerPlugin {
 
         $acl = $this->server->getPlugin('acl');
 
-        if ($componentType === 'VFREEBUSY' && $method === 'REQUEST') {
-
-            $acl && $acl->checkPrivileges($outboxPath, '{' . self::NS_CALDAV . '}schedule-send-freebusy');
+        if ('VFREEBUSY' === $componentType && 'REQUEST' === $method) {
+            $acl && $acl->checkPrivileges($outboxPath, '{'.self::NS_CALDAV.'}schedule-send-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 IOutbox           $outbox
      * @param VObject\Component $vObject
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return string
      */
-    protected function handleFreeBusyRequest(IOutbox $outbox, VObject\Component $vObject, RequestInterface $request, ResponseInterface $response) {
-
+    protected function handleFreeBusyRequest(IOutbox $outbox, VObject\Component $vObject, RequestInterface $request, ResponseInterface $response)
+    {
         $vFreeBusy = $vObject->VFREEBUSY;
         $organizer = $vFreeBusy->ORGANIZER;
 
-        $organizer = (string)$organizer;
+        $organizer = (string) $organizer;
 
         // Validating if the organizer matches the owner of the inbox.
         $owner = $outbox->getOwner();
 
-        $caldavNS = '{' . self::NS_CALDAV . '}';
+        $caldavNS = '{'.self::NS_CALDAV.'}';
 
-        $uas = $caldavNS . 'calendar-user-address-set';
+        $uas = $caldavNS.'calendar-user-address-set';
         $props = $this->server->getProperties($owner, [$uas]);
 
         if (empty($props[$uas]) || !in_array($organizer, $props[$uas]->getHrefs())) {
@@ -820,10 +790,9 @@ class Plugin extends ServerPlugin {
 
         $attendees = [];
         foreach ($vFreeBusy->ATTENDEE as $attendee) {
-            $attendees[] = (string)$attendee;
+            $attendees[] = (string) $attendee;
         }
 
-
         if (!isset($vFreeBusy->DTSTART) || !isset($vFreeBusy->DTEND)) {
             throw new BadRequest('DTSTART and DTEND must both be specified');
         }
@@ -840,9 +809,7 @@ class Plugin extends ServerPlugin {
         $dom->formatOutput = true;
         $scheduleResponse = $dom->createElement('cal:schedule-response');
         foreach ($this->server->xml->namespaceMap as $namespace => $prefix) {
-
-            $scheduleResponse->setAttribute('xmlns:' . $prefix, $namespace);
-
+            $scheduleResponse->setAttribute('xmlns:'.$prefix, $namespace);
         }
         $dom->appendChild($scheduleResponse);
 
@@ -861,11 +828,9 @@ class Plugin extends ServerPlugin {
             $xresponse->appendChild($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);
         }
@@ -873,12 +838,11 @@ class Plugin extends ServerPlugin {
         $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:
+     * data is an array containing the following properties:.
      *
      * calendar-data : A VFREEBUSY VObject
      * request-status : an iTip status code.
@@ -888,54 +852,56 @@ class Plugin extends ServerPlugin {
      *   * 2.0;description
      *   * 3.7;description
      *
-     * @param string $email address
+     * @param string             $email   address
      * @param \DateTimeInterface $start
      * @param \DateTimeInterface $end
-     * @param VObject\Component $request
+     * @param VObject\Component  $request
+     *
      * @return array
      */
-    protected function getFreeBusyForEmail($email, \DateTimeInterface $start, \DateTimeInterface $end, VObject\Component $request) {
-
-        $caldavNS = '{' . self::NS_CALDAV . '}';
+    protected function getFreeBusyForEmail($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);
+        if ('mailto:' === substr($email, 0, 7)) {
+            $email = substr($email, 7);
+        }
 
         $result = $aclPlugin->principalSearch(
             ['{http://sabredav.org/ns}email-address' => $email],
             [
                 '{DAV:}principal-URL',
-                $caldavNS . 'calendar-home-set',
-                $caldavNS . 'schedule-inbox-URL',
+                $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:' . $email,
+                'href' => 'mailto:'.$email,
             ];
         }
 
-        if (!isset($result[0][200][$caldavNS . 'calendar-home-set'])) {
+        if (!isset($result[0][200][$caldavNS.'calendar-home-set'])) {
             return [
                 'request-status' => '3.7;No calendar-home-set property found',
-                'href'           => 'mailto:' . $email,
+                'href' => 'mailto:'.$email,
             ];
         }
-        if (!isset($result[0][200][$caldavNS . 'schedule-inbox-URL'])) {
+        if (!isset($result[0][200][$caldavNS.'schedule-inbox-URL'])) {
             return [
                 'request-status' => '3.7;No schedule-inbox-URL property found',
-                'href'           => 'mailto:' . $email,
+                'href' => 'mailto:'.$email,
             ];
         }
-        $homeSet = $result[0][200][$caldavNS . 'calendar-home-set']->getHref();
-        $inboxUrl = $result[0][200][$caldavNS . 'schedule-inbox-URL']->getHref();
+        $homeSet = $result[0][200][$caldavNS.'calendar-home-set']->getHref();
+        $inboxUrl = $result[0][200][$caldavNS.'schedule-inbox-URL']->getHref();
 
         // Do we have permission?
-        $aclPlugin->checkPrivileges($inboxUrl, $caldavNS . 'schedule-query-freebusy');
+        $aclPlugin->checkPrivileges($inboxUrl, $caldavNS.'schedule-query-freebusy');
 
         // Grabbing the calendar list
         $objects = [];
@@ -946,11 +912,11 @@ class Plugin extends ServerPlugin {
                 continue;
             }
 
-            $sct = $caldavNS . 'schedule-calendar-transp';
-            $ctz = $caldavNS . 'calendar-timezone';
+            $sct = $caldavNS.'schedule-calendar-transp';
+            $ctz = $caldavNS.'calendar-timezone';
             $props = $node->getProperties([$sct, $ctz]);
 
-            if (isset($props[$sct]) && $props[$sct]->getValue() == ScheduleCalendarTransp::TRANSPARENT) {
+            if (isset($props[$sct]) && ScheduleCalendarTransp::TRANSPARENT == $props[$sct]->getValue()) {
                 // If a calendar is marked as 'transparent', it means we must
                 // ignore it for free-busy purposes.
                 continue;
@@ -962,41 +928,40 @@ class Plugin extends ServerPlugin {
 
                 // 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',
+                'name' => 'VCALENDAR',
                 'comp-filters' => [
                     [
-                        'name'           => 'VEVENT',
-                        'comp-filters'   => [],
-                        'prop-filters'   => [],
+                        'name' => 'VEVENT',
+                        'comp-filters' => [],
+                        'prop-filters' => [],
                         'is-not-defined' => false,
-                        'time-range'     => [
+                        'time-range' => [
                             'start' => $start,
-                            'end'   => $end,
+                            'end' => $end,
                         ],
                     ],
                 ],
-                'prop-filters'   => [],
+                'prop-filters' => [],
                 'is-not-defined' => false,
-                'time-range'     => null,
+                'time-range' => null,
             ]);
 
-            $calObjects = array_map(function($url) use ($node) {
+            $calObjects = array_map(function ($url) use ($node) {
                 $obj = $node->getChild($url)->get();
+
                 return $obj;
             }, $urls);
 
             $objects = array_merge($objects, $calObjects);
-
         }
 
         $inboxProps = $this->server->getProperties(
             $inboxUrl,
-            $caldavNS . 'calendar-availability'
+            $caldavNS.'calendar-availability'
         );
 
         $vcalendar = new VObject\Component\VCalendar();
@@ -1011,21 +976,21 @@ class Plugin extends ServerPlugin {
         if ($inboxProps) {
             $generator->setVAvailability(
                 VObject\Reader::read(
-                    $inboxProps[$caldavNS . 'calendar-availability']
+                    $inboxProps[$caldavNS.'calendar-availability']
                 )
             );
         }
 
         $result = $generator->getResult();
 
-        $vcalendar->VFREEBUSY->ATTENDEE = 'mailto:' . $email;
-        $vcalendar->VFREEBUSY->UID = (string)$request->VFREEBUSY->UID;
+        $vcalendar->VFREEBUSY->ATTENDEE = 'mailto:'.$email;
+        $vcalendar->VFREEBUSY->UID = (string) $request->VFREEBUSY->UID;
         $vcalendar->VFREEBUSY->ORGANIZER = clone $request->VFREEBUSY->ORGANIZER;
 
         return [
-            'calendar-data'  => $result,
+            'calendar-data' => $result,
             'request-status' => '2.0;Success',
-            'href'           => 'mailto:' . $email,
+            'href' => 'mailto:'.$email,
         ];
     }
 
@@ -1034,13 +999,14 @@ class Plugin extends ServerPlugin {
      * and returns false if it's 'F', otherwise true.
      *
      * @param RequestInterface $request
+     *
      * @return bool
      */
-    private function scheduleReply(RequestInterface $request) {
-
+    private function scheduleReply(RequestInterface $request)
+    {
         $scheduleReply = $request->getHeader('Schedule-Reply');
-        return $scheduleReply !== 'F';
 
+        return 'F' !== $scheduleReply;
     }
 
     /**
@@ -1054,13 +1020,12 @@ class Plugin extends ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Adds calendar-auto-schedule, as defined in rfc6638',
-            'link'        => 'http://sabre.io/dav/scheduling/',
+            '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
index 0cd05a965..d34c92327 100644
--- a/vendor/sabre/dav/lib/CalDAV/Schedule/SchedulingObject.php
+++ b/vendor/sabre/dav/lib/CalDAV/Schedule/SchedulingObject.php
@@ -1,35 +1,23 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Schedule;
 
 use Sabre\CalDAV\Backend;
 use Sabre\DAV\Exception\MethodNotAllowed;
 
 /**
- * The SchedulingObject represents a scheduling object in the Inbox collection
+ * 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;
-
+class SchedulingObject extends \Sabre\CalDAV\CalendarObject implements ISchedulingObject
+{
     /**
-     * Constructor
+     * Constructor.
      *
      * The following properties may be passed within $objectData:
      *
@@ -43,73 +31,65 @@ class SchedulingObject extends \Sabre\CalDAV\CalendarObject implements IScheduli
      *   * acl - (optional) Use this to override the default ACL for the node.
      *
      * @param Backend\SchedulingSupport $caldavBackend
-     * @param array $objectData
+     * @param array                     $objectData
      */
-    function __construct(Backend\SchedulingSupport $caldavBackend, array $objectData) {
-
-        $this->caldavBackend = $caldavBackend;
+    public function __construct(Backend\SchedulingSupport $caldavBackend, array $objectData)
+    {
+        parent::__construct($caldavBackend, [], $objectData);
 
         if (!isset($objectData['uri'])) {
             throw new \InvalidArgumentException('The objectData argument must contain an \'uri\' property');
         }
-
-        $this->objectData = $objectData;
-
     }
 
     /**
-     * Returns the ICalendar-formatted object
+     * Returns the ICalendar-formatted object.
      *
      * @return string
      */
-    function get() {
-
+    public 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'];
 
+        return $this->objectData['calendardata'];
     }
 
     /**
-     * Updates the ICalendar-formatted object
+     * Updates the ICalendar-formatted object.
      *
      * @param string|resource $calendarData
+     *
      * @return string
      */
-    function put($calendarData) {
-
+    public function put($calendarData)
+    {
         throw new MethodNotAllowed('Updating scheduling objects is not supported');
-
     }
 
     /**
-     * Deletes the scheduling message
-     *
-     * @return void
+     * Deletes the scheduling message.
      */
-    function delete() {
-
+    public function delete()
+    {
         $this->caldavBackend->deleteSchedulingObject($this->objectData['principaluri'], $this->objectData['uri']);
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->objectData['principaluri'];
-
     }
 
-
     /**
      * Returns a list of ACE's for this node.
      *
@@ -122,8 +102,8 @@ class SchedulingObject extends \Sabre\CalDAV\CalendarObject implements IScheduli
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         // An alternative acl may be specified in the object data.
         //
 
@@ -140,16 +120,14 @@ class SchedulingObject extends \Sabre\CalDAV\CalendarObject implements IScheduli
             ],
             [
                 'privilege' => '{DAV:}all',
-                'principal' => $this->objectData['principaluri'] . '/calendar-proxy-write',
+                'principal' => $this->objectData['principaluri'].'/calendar-proxy-write',
                 'protected' => true,
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->objectData['principaluri'] . '/calendar-proxy-read',
+                'principal' => $this->objectData['principaluri'].'/calendar-proxy-read',
                 'protected' => true,
             ],
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/SharedCalendar.php b/vendor/sabre/dav/lib/CalDAV/SharedCalendar.php
index 7a77616e3..818392f57 100644
--- a/vendor/sabre/dav/lib/CalDAV/SharedCalendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/SharedCalendar.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use Sabre\DAV\Sharing\Plugin as SPlugin;
@@ -11,8 +13,8 @@ use Sabre\DAV\Sharing\Plugin as SPlugin;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SharedCalendar extends Calendar implements ISharedCalendar {
-
+class SharedCalendar extends Calendar implements ISharedCalendar
+{
     /**
      * Returns the 'access level' for the instance of this shared resource.
      *
@@ -21,10 +23,9 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      *
      * @return int
      */
-    function getShareAccess() {
-
+    public function getShareAccess()
+    {
         return isset($this->calendarInfo['share-access']) ? $this->calendarInfo['share-access'] : SPlugin::ACCESS_NOTSHARED;
-
     }
 
     /**
@@ -38,10 +39,9 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      *
      * @return string
      */
-    function getShareResourceUri() {
-
+    public function getShareResourceUri()
+    {
         return $this->calendarInfo['share-resource-uri'];
-
     }
 
     /**
@@ -50,12 +50,10 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      * Every item must be a Sharee object.
      *
      * @param \Sabre\DAV\Xml\Element\Sharee[] $sharees
-     * @return void
      */
-    function updateInvites(array $sharees) {
-
+    public function updateInvites(array $sharees)
+    {
         $this->caldavBackend->updateInvites($this->calendarInfo['id'], $sharees);
-
     }
 
     /**
@@ -74,10 +72,9 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      *
      * @return \Sabre\DAV\Xml\Element\Sharee[]
      */
-    function getInvites() {
-
+    public function getInvites()
+    {
         return $this->caldavBackend->getInvites($this->calendarInfo['id']);
-
     }
 
     /**
@@ -87,12 +84,10 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      * subscribable calendar.
      *
      * @param bool $value
-     * @return void
      */
-    function setPublishStatus($value) {
-
+    public function setPublishStatus($value)
+    {
         $this->caldavBackend->setPublishStatus($this->calendarInfo['id'], $value);
-
     }
 
     /**
@@ -107,13 +102,13 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         $acl = [];
 
         switch ($this->getShareAccess()) {
-            case SPlugin::ACCESS_NOTSHARED :
-            case SPlugin::ACCESS_SHAREDOWNER :
+            case SPlugin::ACCESS_NOTSHARED:
+            case SPlugin::ACCESS_SHAREDOWNER:
                 $acl[] = [
                     'privilege' => '{DAV:}share',
                     'principal' => $this->calendarInfo['principaluri'],
@@ -121,11 +116,11 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
                 ];
                 $acl[] = [
                     'privilege' => '{DAV:}share',
-                    'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
+                    'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-write',
                     'protected' => true,
                 ];
-                // No break intentional!
-            case SPlugin::ACCESS_READWRITE :
+                // no break intentional!
+            case SPlugin::ACCESS_READWRITE:
                 $acl[] = [
                     'privilege' => '{DAV:}write',
                     'principal' => $this->calendarInfo['principaluri'],
@@ -133,11 +128,11 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
                 ];
                 $acl[] = [
                     'privilege' => '{DAV:}write',
-                    'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
+                    'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-write',
                     'protected' => true,
                 ];
-                // No break intentional!
-            case SPlugin::ACCESS_READ :
+                // no break intentional!
+            case SPlugin::ACCESS_READ:
                 $acl[] = [
                     'privilege' => '{DAV:}write-properties',
                     'principal' => $this->calendarInfo['principaluri'],
@@ -145,7 +140,7 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
                 ];
                 $acl[] = [
                     'privilege' => '{DAV:}write-properties',
-                    'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
+                    'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-write',
                     'protected' => true,
                 ];
                 $acl[] = [
@@ -155,26 +150,25 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
                 ];
                 $acl[] = [
                     'privilege' => '{DAV:}read',
-                    'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-read',
+                    'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-read',
                     'protected' => true,
                 ];
                 $acl[] = [
                     'privilege' => '{DAV:}read',
-                    'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
+                    'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-write',
                     'protected' => true,
                 ];
                 $acl[] = [
-                    'privilege' => '{' . Plugin::NS_CALDAV . '}read-free-busy',
+                    'privilege' => '{'.Plugin::NS_CALDAV.'}read-free-busy',
                     'principal' => '{DAV:}authenticated',
                     'protected' => true,
                 ];
                 break;
         }
-        return $acl;
 
+        return $acl;
     }
 
-
     /**
      * This method returns the ACL's for calendar objects in this calendar.
      * The result of this method automatically gets passed to the
@@ -182,15 +176,13 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
      *
      * @return array
      */
-    function getChildACL() {
-
+    public function getChildACL()
+    {
         $acl = [];
 
         switch ($this->getShareAccess()) {
-            case SPlugin::ACCESS_NOTSHARED :
-                // No break intentional
-            case SPlugin::ACCESS_SHAREDOWNER :
-                // No break intentional
+            case SPlugin::ACCESS_NOTSHARED:
+            case SPlugin::ACCESS_SHAREDOWNER:
             case SPlugin::ACCESS_READWRITE:
                 $acl[] = [
                     'privilege' => '{DAV:}write',
@@ -199,10 +191,10 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
                 ];
                 $acl[] = [
                     'privilege' => '{DAV:}write',
-                    'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
+                    'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-write',
                     'protected' => true,
                 ];
-                // No break intentional
+                // no break intentional
             case SPlugin::ACCESS_READ:
                 $acl[] = [
                     'privilege' => '{DAV:}read',
@@ -211,19 +203,17 @@ class SharedCalendar extends Calendar implements ISharedCalendar {
                 ];
                 $acl[] = [
                     'privilege' => '{DAV:}read',
-                    'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-write',
+                    'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-write',
                     'protected' => true,
                 ];
                 $acl[] = [
                     'privilege' => '{DAV:}read',
-                    'principal' => $this->calendarInfo['principaluri'] . '/calendar-proxy-read',
+                    'principal' => $this->calendarInfo['principaluri'].'/calendar-proxy-read',
                     'protected' => true,
                 ];
                 break;
         }
 
         return $acl;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/SharingPlugin.php b/vendor/sabre/dav/lib/CalDAV/SharingPlugin.php
index 5cce79678..be8c46a9e 100644
--- a/vendor/sabre/dav/lib/CalDAV/SharingPlugin.php
+++ b/vendor/sabre/dav/lib/CalDAV/SharingPlugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV;
 
 use Sabre\DAV;
@@ -23,8 +25,8 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SharingPlugin extends DAV\ServerPlugin {
-
+class SharingPlugin extends DAV\ServerPlugin
+{
     /**
      * Reference to SabreDAV server object.
      *
@@ -40,10 +42,9 @@ class SharingPlugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return ['calendarserver-sharing'];
-
     }
 
     /**
@@ -54,10 +55,9 @@ class SharingPlugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'caldav-sharing';
-
     }
 
     /**
@@ -69,10 +69,9 @@ class SharingPlugin extends DAV\ServerPlugin {
      * This method should set up the required event subscriptions.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public function initialize(DAV\Server $server)
+    {
         $this->server = $server;
 
         if (is_null($this->server->getPlugin('sharing'))) {
@@ -81,19 +80,18 @@ class SharingPlugin extends DAV\ServerPlugin {
 
         array_push(
             $this->server->protectedProperties,
-            '{' . Plugin::NS_CALENDARSERVER . '}invite',
-            '{' . Plugin::NS_CALENDARSERVER . '}allowed-sharing-modes',
-            '{' . Plugin::NS_CALENDARSERVER . '}shared-url'
+            '{'.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->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']);
     }
 
     /**
@@ -103,47 +101,17 @@ class SharingPlugin extends DAV\ServerPlugin {
      * This allows us to inject any properties early.
      *
      * @param DAV\PropFind $propFind
-     * @param DAV\INode $node
-     * @return void
+     * @param DAV\INode    $node
      */
-    function propFindEarly(DAV\PropFind $propFind, DAV\INode $node) {
-
+    public function propFindEarly(DAV\PropFind $propFind, DAV\INode $node)
+    {
         if ($node instanceof ISharedCalendar) {
-
-            $propFind->handle('{' . Plugin::NS_CALENDARSERVER . '}invite', function() use ($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'];
-                    }
-
-                }
-
+            $propFind->handle('{'.Plugin::NS_CALENDARSERVER.'}invite', function () use ($node) {
                 return new Xml\Property\Invite(
-                    $node->getInvites(),
-                    $ownerInfo
+                    $node->getInvites()
                 );
-
             });
-
         }
-
     }
 
     /**
@@ -152,31 +120,27 @@ class SharingPlugin extends DAV\ServerPlugin {
      * have been shared.
      *
      * @param DAV\PropFind $propFind
-     * @param DAV\INode $node
-     * @return void
+     * @param DAV\INode    $node
      */
-    function propFindLate(DAV\PropFind $propFind, DAV\INode $node) {
-
+    public function propFindLate(DAV\PropFind $propFind, DAV\INode $node)
+    {
         if ($node instanceof ISharedCalendar) {
             $shareAccess = $node->getShareAccess();
             if ($rt = $propFind->get('{DAV:}resourcetype')) {
                 switch ($shareAccess) {
-                    case \Sabre\DAV\Sharing\Plugin::ACCESS_SHAREDOWNER :
-                        $rt->add('{' . Plugin::NS_CALENDARSERVER . '}shared-owner');
+                    case \Sabre\DAV\Sharing\Plugin::ACCESS_SHAREDOWNER:
+                        $rt->add('{'.Plugin::NS_CALENDARSERVER.'}shared-owner');
                         break;
-                    case \Sabre\DAV\Sharing\Plugin::ACCESS_READ :
-                    case \Sabre\DAV\Sharing\Plugin::ACCESS_READWRITE :
-                        $rt->add('{' . Plugin::NS_CALENDARSERVER . '}shared');
+                    case \Sabre\DAV\Sharing\Plugin::ACCESS_READ:
+                    case \Sabre\DAV\Sharing\Plugin::ACCESS_READWRITE:
+                        $rt->add('{'.Plugin::NS_CALENDARSERVER.'}shared');
                         break;
-
                 }
             }
-            $propFind->handle('{' . Plugin::NS_CALENDARSERVER . '}allowed-sharing-modes', function() {
+            $propFind->handle('{'.Plugin::NS_CALENDARSERVER.'}allowed-sharing-modes', function () {
                 return new Xml\Property\AllowedSharingModes(true, false);
             });
-
         }
-
     }
 
     /**
@@ -190,20 +154,21 @@ class SharingPlugin extends DAV\ServerPlugin {
      * 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 string        $path
      * @param DAV\PropPatch $propPatch
-     * @return void
      */
-    function propPatch($path, DAV\PropPatch $propPatch) {
-
+    public function propPatch($path, DAV\PropPatch $propPatch)
+    {
         $node = $this->server->tree->getNodeForPath($path);
-        if (!$node instanceof ISharedCalendar)
+        if (!$node instanceof ISharedCalendar) {
             return;
+        }
 
-        if ($node->getShareAccess() === \Sabre\DAV\Sharing\Plugin::ACCESS_SHAREDOWNER || $node->getShareAccess() === \Sabre\DAV\Sharing\Plugin::ACCESS_NOTSHARED) {
-
-            $propPatch->handle('{DAV:}resourcetype', function($value) use ($node) {
-                if ($value->is('{' . Plugin::NS_CALENDARSERVER . '}shared-owner')) return false;
+        if (\Sabre\DAV\Sharing\Plugin::ACCESS_SHAREDOWNER === $node->getShareAccess() || \Sabre\DAV\Sharing\Plugin::ACCESS_NOTSHARED === $node->getShareAccess()) {
+            $propPatch->handle('{DAV:}resourcetype', function ($value) use ($node) {
+                if ($value->is('{'.Plugin::NS_CALENDARSERVER.'}shared-owner')) {
+                    return false;
+                }
                 $shares = $node->getInvites();
                 foreach ($shares as $share) {
                     $share->access = DAV\Sharing\Plugin::ACCESS_NOACCESS;
@@ -211,28 +176,30 @@ class SharingPlugin extends DAV\ServerPlugin {
                 $node->updateInvites($shares);
 
                 return true;
-
             });
-
         }
-
     }
 
     /**
      * We intercept this to handle POST requests on calendars.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return null|bool
+     *
+     * @return bool|null
      */
-    function httpPost(RequestInterface $request, ResponseInterface $response) {
-
+    public 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)
+        if (null === $contentType) {
             return;
+        }
+        if (false === strpos($contentType, 'application/xml') && false === strpos($contentType, 'text/xml')) {
+            return;
+        }
 
         // Making sure the node exists
         try {
@@ -255,10 +222,9 @@ class SharingPlugin extends DAV\ServerPlugin {
         $message = $this->server->xml->parse($requestBody, $request->getUrl(), $documentType);
 
         switch ($documentType) {
-
             // Both the DAV:share-resource and CALENDARSERVER:share requests
             // behave identically.
-            case '{' . Plugin::NS_CALENDARSERVER . '}share' :
+            case '{'.Plugin::NS_CALENDARSERVER.'}share':
 
                 $sharingPlugin = $this->server->getPlugin('sharing');
                 $sharingPlugin->shareResource($path, $message->sharees);
@@ -273,7 +239,7 @@ class SharingPlugin extends DAV\ServerPlugin {
 
             // The invite-reply document is sent when the user replies to an
             // invitation of a calendar share.
-            case '{' . Plugin::NS_CALENDARSERVER . '}invite-reply' :
+            case '{'.Plugin::NS_CALENDARSERVER.'}invite-reply':
 
                 // This only works on the calendar-home-root node.
                 if (!$node instanceof CalendarHome) {
@@ -304,20 +270,20 @@ class SharingPlugin extends DAV\ServerPlugin {
 
                 if ($url) {
                     $writer = $this->server->xml->getWriter();
+                    $writer->contextUri = $request->getUrl();
                     $writer->openMemory();
                     $writer->startDocument();
-                    $writer->startElement('{' . Plugin::NS_CALENDARSERVER . '}shared-as');
+                    $writer->startElement('{'.Plugin::NS_CALENDARSERVER.'}shared-as');
                     $writer->write(new LocalHref($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' :
+            case '{'.Plugin::NS_CALENDARSERVER.'}publish-calendar':
 
                 // We can only deal with IShareableCalendar objects
                 if (!$node instanceof ISharedCalendar) {
@@ -345,7 +311,7 @@ class SharingPlugin extends DAV\ServerPlugin {
                 // Breaking the event chain
                 return false;
 
-            case '{' . Plugin::NS_CALENDARSERVER . '}unpublish-calendar' :
+            case '{'.Plugin::NS_CALENDARSERVER.'}unpublish-calendar':
 
                 // We can only deal with IShareableCalendar objects
                 if (!$node instanceof ISharedCalendar) {
@@ -371,11 +337,7 @@ class SharingPlugin extends DAV\ServerPlugin {
 
                 // Breaking the event chain
                 return false;
-
         }
-
-
-
     }
 
     /**
@@ -389,13 +351,12 @@ class SharingPlugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Adds support for caldav-sharing.',
-            'link'        => 'http://sabre.io/dav/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
index 7ba259c7b..e83082c52 100644
--- a/vendor/sabre/dav/lib/CalDAV/Subscriptions/ISubscription.php
+++ b/vendor/sabre/dav/lib/CalDAV/Subscriptions/ISubscription.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Subscriptions;
 
 use Sabre\DAV\ICollection;
 use Sabre\DAV\IProperties;
 
 /**
- * ISubscription
+ * ISubscription.
  *
  * Nodes implementing this interface represent calendar subscriptions.
  *
@@ -34,7 +36,6 @@ use Sabre\DAV\IProperties;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ISubscription extends ICollection, IProperties {
-
-
+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
index 877d96c6c..238866894 100644
--- a/vendor/sabre/dav/lib/CalDAV/Subscriptions/Plugin.php
+++ b/vendor/sabre/dav/lib/CalDAV/Subscriptions/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Subscriptions;
 
 use Sabre\DAV\INode;
@@ -17,8 +19,8 @@ use Sabre\DAV\ServerPlugin;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends ServerPlugin {
-
+class Plugin extends ServerPlugin
+{
     /**
      * This initializes the plugin.
      *
@@ -28,10 +30,9 @@ class Plugin extends ServerPlugin {
      * This method should set up the required event subscriptions.
      *
      * @param Server $server
-     * @return void
      */
-    function initialize(Server $server) {
-
+    public function initialize(Server $server)
+    {
         $server->resourceTypeMapping['Sabre\\CalDAV\\Subscriptions\\ISubscription'] =
             '{http://calendarserver.org/ns/}subscribed';
 
@@ -39,7 +40,6 @@ class Plugin extends ServerPlugin {
             'Sabre\\DAV\\Xml\\Property\\Href';
 
         $server->on('propFind', [$this, 'propFind'], 150);
-
     }
 
     /**
@@ -50,21 +50,19 @@ class Plugin extends ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return ['calendarserver-subscribed'];
-
     }
 
     /**
      * Triggered after properties have been fetched.
      *
      * @param PropFind $propFind
-     * @param INode $node
-     * @return void
+     * @param INode    $node
      */
-    function propFind(PropFind $propFind, INode $node) {
-
+    public 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 = [
@@ -74,13 +72,10 @@ class Plugin extends ServerPlugin {
         ];
 
         foreach ($props as $prop) {
-
-            if ($propFind->getStatus($prop) === 200) {
+            if (200 === $propFind->getStatus($prop)) {
                 $propFind->set($prop, '', 200);
             }
-
         }
-
     }
 
     /**
@@ -91,10 +86,9 @@ class Plugin extends ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'subscriptions';
-
     }
 
     /**
@@ -108,13 +102,12 @@ class Plugin extends ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'This plugin allows users to store iCalendar subscriptions in their calendar-home.',
-            'link'        => null,
+            'link' => null,
         ];
-
     }
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php b/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php
index 6a1851ed8..0b0282abe 100644
--- a/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php
+++ b/vendor/sabre/dav/lib/CalDAV/Subscriptions/Subscription.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Subscriptions;
 
 use Sabre\CalDAV\Backend\SubscriptionSupport;
@@ -10,7 +12,7 @@ use Sabre\DAVACL\ACLTrait;
 use Sabre\DAVACL\IACL;
 
 /**
- * Subscription Node
+ * Subscription Node.
  *
  * This node represents a subscription.
  *
@@ -18,32 +20,32 @@ use Sabre\DAVACL\IACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Subscription extends Collection implements ISubscription, IACL {
-
+class Subscription extends Collection implements ISubscription, IACL
+{
     use ACLTrait;
 
     /**
-     * caldavBackend
+     * caldavBackend.
      *
      * @var SubscriptionSupport
      */
     protected $caldavBackend;
 
     /**
-     * subscriptionInfo
+     * subscriptionInfo.
      *
      * @var array
      */
     protected $subscriptionInfo;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param SubscriptionSupport $caldavBackend
-     * @param array $subscriptionInfo
+     * @param array               $subscriptionInfo
      */
-    function __construct(SubscriptionSupport $caldavBackend, array $subscriptionInfo) {
-
+    public function __construct(SubscriptionSupport $caldavBackend, array $subscriptionInfo)
+    {
         $this->caldavBackend = $caldavBackend;
         $this->subscriptionInfo = $subscriptionInfo;
 
@@ -56,10 +58,9 @@ class Subscription extends Collection implements ISubscription, IACL {
 
         foreach ($required as $r) {
             if (!isset($subscriptionInfo[$r])) {
-                throw new \InvalidArgumentException('The ' . $r . ' field is required when creating a subscription node');
+                throw new \InvalidArgumentException('The '.$r.' field is required when creating a subscription node');
             }
         }
-
     }
 
     /**
@@ -69,47 +70,41 @@ class Subscription extends Collection implements ISubscription, IACL {
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return $this->subscriptionInfo['uri'];
-
     }
 
     /**
-     * Returns the last modification time
+     * Returns the last modification time.
      *
      * @return int
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         if (isset($this->subscriptionInfo['lastmodified'])) {
             return $this->subscriptionInfo['lastmodified'];
         }
-
     }
 
     /**
-     * Deletes the current node
-     *
-     * @return void
+     * Deletes the current node.
      */
-    function delete() {
-
+    public function delete()
+    {
         $this->caldavBackend->deleteSubscription(
             $this->subscriptionInfo['id']
         );
-
     }
 
     /**
-     * Returns an array with all the child nodes
+     * Returns an array with all the child nodes.
      *
      * @return \Sabre\DAV\INode[]
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         return [];
-
     }
 
     /**
@@ -122,15 +117,13 @@ class Subscription extends Collection implements ISubscription, IACL {
      * Read the PropPatch documentation for more information.
      *
      * @param PropPatch $propPatch
-     * @return void
      */
-    function propPatch(PropPatch $propPatch) {
-
+    public function propPatch(PropPatch $propPatch)
+    {
         return $this->caldavBackend->updateSubscription(
             $this->subscriptionInfo['id'],
             $propPatch
         );
-
     }
 
     /**
@@ -146,29 +139,27 @@ class Subscription extends Collection implements ISubscription, IACL {
      * The Server class will filter out the extra.
      *
      * @param array $properties
+     *
      * @return array
      */
-    function getProperties($properties) {
-
+    public function getProperties($properties)
+    {
         $r = [];
 
         foreach ($properties as $prop) {
-
             switch ($prop) {
-                case '{http://calendarserver.org/ns/}source' :
+                case '{http://calendarserver.org/ns/}source':
                     $r[$prop] = new Href($this->subscriptionInfo['source']);
                     break;
-                default :
+                default:
                     if (array_key_exists($prop, $this->subscriptionInfo)) {
                         $r[$prop] = $this->subscriptionInfo[$prop];
                     }
                     break;
             }
-
         }
 
         return $r;
-
     }
 
     /**
@@ -178,10 +169,9 @@ class Subscription extends Collection implements ISubscription, IACL {
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->subscriptionInfo['principaluri'];
-
     }
 
     /**
@@ -196,8 +186,8 @@ class Subscription extends Collection implements ISubscription, IACL {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         return [
             [
                 'privilege' => '{DAV:}all',
@@ -206,16 +196,14 @@ class Subscription extends Collection implements ISubscription, IACL {
             ],
             [
                 'privilege' => '{DAV:}all',
-                'principal' => $this->getOwner() . '/calendar-proxy-write',
+                'principal' => $this->getOwner().'/calendar-proxy-write',
                 'protected' => true,
             ],
             [
                 'privilege' => '{DAV:}read',
-                'principal' => $this->getOwner() . '/calendar-proxy-read',
+                'principal' => $this->getOwner().'/calendar-proxy-read',
                 'protected' => true,
-            ]
+            ],
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CalendarData.php b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CalendarData.php
index 9669be304..0d53aeda3 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CalendarData.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CalendarData.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Filter;
 
 use Sabre\CalDAV\Plugin;
@@ -25,8 +27,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CalendarData implements XmlDeserializable {
-
+class CalendarData implements XmlDeserializable
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -46,24 +48,24 @@ class CalendarData implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $result = [
             'contentType' => $reader->getAttribute('content-type') ?: 'text/calendar',
-            'version'     => $reader->getAttribute('version') ?: '2.0',
+            'version' => $reader->getAttribute('version') ?: '2.0',
         ];
 
-        $elems = (array)$reader->parseInnerTree();
+        $elems = (array) $reader->parseInnerTree();
         foreach ($elems as $elem) {
-
             switch ($elem['name']) {
-                case '{' . Plugin::NS_CALDAV . '}expand' :
+                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($elem['attributes']['end']) : null,
+                        'end' => isset($elem['attributes']['end']) ? DateTimeParser::parseDateTime($elem['attributes']['end']) : null,
                     ];
 
                     if (!$result['expand']['start'] || !$result['expand']['end']) {
@@ -74,11 +76,8 @@ class CalendarData implements XmlDeserializable {
                     }
                     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
index c21ede66b..832346eea 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CompFilter.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/CompFilter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Filter;
 
 use Sabre\CalDAV\Plugin;
@@ -22,8 +24,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CompFilter implements XmlDeserializable {
-
+class CompFilter implements XmlDeserializable
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -43,16 +45,17 @@ class CompFilter implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $result = [
-            'name'           => null,
+            'name' => null,
             'is-not-defined' => false,
-            'comp-filters'   => [],
-            'prop-filters'   => [],
-            'time-range'     => false,
+            'comp-filters' => [],
+            'prop-filters' => [],
+            'time-range' => false,
         ];
 
         $att = $reader->parseAttributes();
@@ -60,38 +63,34 @@ class CompFilter implements XmlDeserializable {
 
         $elems = $reader->parseInnerTree();
 
-        if (is_array($elems)) foreach ($elems as $elem) {
-
-            switch ($elem['name']) {
-
-                case '{' . Plugin::NS_CALDAV . '}comp-filter' :
+        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' :
+                case '{'.Plugin::NS_CALDAV.'}prop-filter':
                     $result['prop-filters'][] = $elem['value'];
                     break;
-                case '{' . Plugin::NS_CALDAV . '}is-not-defined' :
+                case '{'.Plugin::NS_CALDAV.'}is-not-defined':
                     $result['is-not-defined'] = true;
                     break;
-                case '{' . Plugin::NS_CALDAV . '}time-range' :
-                    if ($result['name'] === 'VCALENDAR') {
+                case '{'.Plugin::NS_CALDAV.'}time-range':
+                    if ('VCALENDAR' === $result['name']) {
                         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($elem['attributes']['end']) : null,
+                        'end' => isset($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
index bf422cf05..ec9ff753c 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Filter/ParamFilter.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/ParamFilter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Filter;
 
 use Sabre\CalDAV\Plugin;
@@ -20,8 +22,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ParamFilter implements XmlDeserializable {
-
+class ParamFilter implements XmlDeserializable
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -41,14 +43,15 @@ class ParamFilter implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $result = [
-            'name'           => null,
+            'name' => null,
             'is-not-defined' => false,
-            'text-match'     => null,
+            'text-match' => null,
         ];
 
         $att = $reader->parseAttributes();
@@ -56,27 +59,23 @@ class ParamFilter implements XmlDeserializable {
 
         $elems = $reader->parseInnerTree();
 
-        if (is_array($elems)) foreach ($elems as $elem) {
-
-            switch ($elem['name']) {
-
-                case '{' . Plugin::NS_CALDAV . '}is-not-defined' :
+        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' :
+                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'            => $elem['value'],
+                        'negate-condition' => isset($elem['attributes']['negate-condition']) && 'yes' === $elem['attributes']['negate-condition'],
+                        'collation' => isset($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
index db9207295..f4600574e 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Filter/PropFilter.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Filter/PropFilter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Filter;
 
 use Sabre\CalDAV\Plugin;
@@ -22,8 +24,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PropFilter implements XmlDeserializable {
-
+class PropFilter implements XmlDeserializable
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -43,16 +45,17 @@ class PropFilter implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $result = [
-            'name'           => null,
+            'name' => null,
             'is-not-defined' => false,
-            'param-filters'  => [],
-            'text-match'     => null,
-            'time-range'     => false,
+            'param-filters' => [],
+            'text-match' => null,
+            'time-range' => false,
         ];
 
         $att = $reader->parseAttributes();
@@ -60,39 +63,35 @@ class PropFilter implements XmlDeserializable {
 
         $elems = $reader->parseInnerTree();
 
-        if (is_array($elems)) foreach ($elems as $elem) {
-
-            switch ($elem['name']) {
-
-                case '{' . Plugin::NS_CALDAV . '}param-filter' :
+        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' :
+                case '{'.Plugin::NS_CALDAV.'}is-not-defined':
                     $result['is-not-defined'] = true;
                     break;
-                case '{' . Plugin::NS_CALDAV . '}time-range' :
+                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($elem['attributes']['end']) : null,
+                        'end' => isset($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' :
+                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'            => $elem['value'],
+                        'negate-condition' => isset($elem['attributes']['negate-condition']) && 'yes' === $elem['attributes']['negate-condition'],
+                        'collation' => isset($elem['attributes']['collation']) ? $elem['attributes']['collation'] : 'i;ascii-casemap',
+                        'value' => $elem['value'],
                     ];
                     break;
-
             }
-
+            }
         }
 
         return $result;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Notification/Invite.php b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/Invite.php
index 92a9ac7b7..926656674 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Notification/Invite.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/Invite.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Notification;
 
 use Sabre\CalDAV;
@@ -17,19 +19,19 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Invite implements NotificationInterface {
-
+class Invite implements NotificationInterface
+{
     /**
-     * A unique id for the message
+     * A unique id for the message.
      *
      * @var string
      */
     protected $id;
 
     /**
-     * Timestamp of the notification
+     * Timestamp of the notification.
      *
-     * @var DateTime
+     * @var \DateTime
      */
     protected $dtStamp;
 
@@ -63,7 +65,7 @@ class Invite implements NotificationInterface {
     protected $hostUrl;
 
     /**
-     * Url to the sharer of the calendar
+     * Url to the sharer of the calendar.
      *
      * @var string
      */
@@ -91,21 +93,21 @@ class Invite implements NotificationInterface {
     protected $lastName;
 
     /**
-     * A description of the share request
+     * A description of the share request.
      *
      * @var string
      */
     protected $summary;
 
     /**
-     * The Etag for the notification
+     * The Etag for the notification.
      *
      * @var string
      */
     protected $etag;
 
     /**
-     * The list of supported components
+     * The list of supported components.
      *
      * @var CalDAV\Xml\Property\SupportedCalendarComponentSet
      */
@@ -138,8 +140,8 @@ class Invite implements NotificationInterface {
      *
      * @param array $values All the options
      */
-    function __construct(array $values) {
-
+    public function __construct(array $values)
+    {
         $required = [
             'id',
             'etag',
@@ -152,17 +154,16 @@ class Invite implements NotificationInterface {
         ];
         foreach ($required as $item) {
             if (!isset($values[$item])) {
-                throw new \InvalidArgumentException($item . ' is a required constructor option');
+                throw new \InvalidArgumentException($item.' is a required constructor option');
             }
         }
 
         foreach ($values as $key => $value) {
             if (!property_exists($this, $key)) {
-                throw new \InvalidArgumentException('Unknown option: ' . $key);
+                throw new \InvalidArgumentException('Unknown option: '.$key);
             }
             $this->$key = $value;
         }
-
     }
 
     /**
@@ -182,12 +183,10 @@ class Invite implements NotificationInterface {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
-        $writer->writeElement('{' . CalDAV\Plugin::NS_CALENDARSERVER . '}invite-notification');
-
+    public function xmlSerialize(Writer $writer)
+    {
+        $writer->writeElement('{'.CalDAV\Plugin::NS_CALENDARSERVER.'}invite-notification');
     }
 
     /**
@@ -195,95 +194,90 @@ class Invite implements NotificationInterface {
      * response body.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerializeFull(Writer $writer) {
+    public function xmlSerializeFull(Writer $writer)
+    {
+        $cs = '{'.CalDAV\Plugin::NS_CALENDARSERVER.'}';
 
-        $cs = '{' . CalDAV\Plugin::NS_CALENDARSERVER . '}';
+        $this->dtStamp->setTimezone(new \DateTimeZone('GMT'));
+        $writer->writeElement($cs.'dtstamp', $this->dtStamp->format('Ymd\\THis\\Z'));
 
-        $this->dtStamp->setTimezone(new \DateTimezone('GMT'));
-        $writer->writeElement($cs . 'dtstamp', $this->dtStamp->format('Ymd\\THis\\Z'));
+        $writer->startElement($cs.'invite-notification');
 
-        $writer->startElement($cs . 'invite-notification');
-
-        $writer->writeElement($cs . 'uid', $this->id);
+        $writer->writeElement($cs.'uid', $this->id);
         $writer->writeElement('{DAV:}href', $this->href);
 
         switch ($this->type) {
-
-            case DAV\Sharing\Plugin::INVITE_ACCEPTED :
-                $writer->writeElement($cs . 'invite-accepted');
+            case DAV\Sharing\Plugin::INVITE_ACCEPTED:
+                $writer->writeElement($cs.'invite-accepted');
                 break;
-            case DAV\Sharing\Plugin::INVITE_NORESPONSE :
-                $writer->writeElement($cs . 'invite-noresponse');
+            case DAV\Sharing\Plugin::INVITE_NORESPONSE:
+                $writer->writeElement($cs.'invite-noresponse');
                 break;
-
         }
 
-        $writer->writeElement($cs . 'hosturl', [
-            '{DAV:}href' => $writer->contextUri . $this->hostUrl
+        $writer->writeElement($cs.'hosturl', [
+            '{DAV:}href' => $writer->contextUri.$this->hostUrl,
             ]);
 
         if ($this->summary) {
-            $writer->writeElement($cs . 'summary', $this->summary);
+            $writer->writeElement($cs.'summary', $this->summary);
         }
 
-        $writer->startElement($cs . 'access');
+        $writer->startElement($cs.'access');
         if ($this->readOnly) {
-            $writer->writeElement($cs . 'read');
+            $writer->writeElement($cs.'read');
         } else {
-            $writer->writeElement($cs . 'read-write');
+            $writer->writeElement($cs.'read-write');
         }
         $writer->endElement(); // access
 
-        $writer->startElement($cs . 'organizer');
+        $writer->startElement($cs.'organizer');
         // If the organizer contains a 'mailto:' part, it means it should be
         // treated as absolute.
-        if (strtolower(substr($this->organizer, 0, 7)) === 'mailto:') {
+        if ('mailto:' === strtolower(substr($this->organizer, 0, 7))) {
             $writer->writeElement('{DAV:}href', $this->organizer);
         } else {
-            $writer->writeElement('{DAV:}href', $writer->contextUri . $this->organizer);
+            $writer->writeElement('{DAV:}href', $writer->contextUri.$this->organizer);
         }
         if ($this->commonName) {
-            $writer->writeElement($cs . 'common-name', $this->commonName);
+            $writer->writeElement($cs.'common-name', $this->commonName);
         }
         if ($this->firstName) {
-            $writer->writeElement($cs . 'first-name', $this->firstName);
+            $writer->writeElement($cs.'first-name', $this->firstName);
         }
         if ($this->lastName) {
-            $writer->writeElement($cs . 'last-name', $this->lastName);
+            $writer->writeElement($cs.'last-name', $this->lastName);
         }
         $writer->endElement(); // organizer
 
         if ($this->commonName) {
-            $writer->writeElement($cs . 'organizer-cn', $this->commonName);
+            $writer->writeElement($cs.'organizer-cn', $this->commonName);
         }
         if ($this->firstName) {
-            $writer->writeElement($cs . 'organizer-first', $this->firstName);
+            $writer->writeElement($cs.'organizer-first', $this->firstName);
         }
         if ($this->lastName) {
-            $writer->writeElement($cs . 'organizer-last', $this->lastName);
+            $writer->writeElement($cs.'organizer-last', $this->lastName);
         }
         if ($this->supportedComponents) {
-            $writer->writeElement('{' . CalDAV\Plugin::NS_CALDAV . '}supported-calendar-component-set', $this->supportedComponents);
+            $writer->writeElement('{'.CalDAV\Plugin::NS_CALDAV.'}supported-calendar-component-set', $this->supportedComponents);
         }
 
         $writer->endElement(); // invite-notification
-
     }
 
     /**
-     * Returns a unique id for this notification
+     * Returns a unique id for this notification.
      *
      * This is just the base url. This should generally be some kind of unique
      * id.
      *
      * @return string
      */
-    function getId() {
-
+    public function getId()
+    {
         return $this->id;
-
     }
 
     /**
@@ -293,10 +287,8 @@ class Invite implements NotificationInterface {
      *
      * @return string
      */
-    function getETag() {
-
+    public function getETag()
+    {
         return $this->etag;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Notification/InviteReply.php b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/InviteReply.php
index f4b10a396..abcbde151 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Notification/InviteReply.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/InviteReply.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Notification;
 
 use Sabre\CalDAV;
@@ -14,19 +16,19 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class InviteReply implements NotificationInterface {
-
+class InviteReply implements NotificationInterface
+{
     /**
-     * A unique id for the message
+     * A unique id for the message.
      *
      * @var string
      */
     protected $id;
 
     /**
-     * Timestamp of the notification
+     * Timestamp of the notification.
      *
-     * @var DateTime
+     * @var \DateTime
      */
     protected $dtStamp;
 
@@ -59,14 +61,14 @@ class InviteReply implements NotificationInterface {
     protected $hostUrl;
 
     /**
-     * A description of the share request
+     * A description of the share request.
      *
      * @var string
      */
     protected $summary;
 
     /**
-     * Notification Etag
+     * Notification Etag.
      *
      * @var string
      */
@@ -90,8 +92,8 @@ class InviteReply implements NotificationInterface {
      *
      * @param array $values
      */
-    function __construct(array $values) {
-
+    public function __construct(array $values)
+    {
         $required = [
             'id',
             'etag',
@@ -103,17 +105,16 @@ class InviteReply implements NotificationInterface {
         ];
         foreach ($required as $item) {
             if (!isset($values[$item])) {
-                throw new \InvalidArgumentException($item . ' is a required constructor option');
+                throw new \InvalidArgumentException($item.' is a required constructor option');
             }
         }
 
         foreach ($values as $key => $value) {
             if (!property_exists($this, $key)) {
-                throw new \InvalidArgumentException('Unknown option: ' . $key);
+                throw new \InvalidArgumentException('Unknown option: '.$key);
             }
             $this->$key = $value;
         }
-
     }
 
     /**
@@ -133,12 +134,10 @@ class InviteReply implements NotificationInterface {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
-        $writer->writeElement('{' . CalDAV\Plugin::NS_CALENDARSERVER . '}invite-reply');
-
+    public function xmlSerialize(Writer $writer)
+    {
+        $writer->writeElement('{'.CalDAV\Plugin::NS_CALENDARSERVER.'}invite-reply');
     }
 
     /**
@@ -146,55 +145,50 @@ class InviteReply implements NotificationInterface {
      * response body.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerializeFull(Writer $writer) {
+    public function xmlSerializeFull(Writer $writer)
+    {
+        $cs = '{'.CalDAV\Plugin::NS_CALENDARSERVER.'}';
 
-        $cs = '{' . CalDAV\Plugin::NS_CALENDARSERVER . '}';
+        $this->dtStamp->setTimezone(new \DateTimeZone('GMT'));
+        $writer->writeElement($cs.'dtstamp', $this->dtStamp->format('Ymd\\THis\\Z'));
 
-        $this->dtStamp->setTimezone(new \DateTimezone('GMT'));
-        $writer->writeElement($cs . 'dtstamp', $this->dtStamp->format('Ymd\\THis\\Z'));
+        $writer->startElement($cs.'invite-reply');
 
-        $writer->startElement($cs . 'invite-reply');
-
-        $writer->writeElement($cs . 'uid', $this->id);
-        $writer->writeElement($cs . 'in-reply-to', $this->inReplyTo);
+        $writer->writeElement($cs.'uid', $this->id);
+        $writer->writeElement($cs.'in-reply-to', $this->inReplyTo);
         $writer->writeElement('{DAV:}href', $this->href);
 
         switch ($this->type) {
-
-            case DAV\Sharing\Plugin::INVITE_ACCEPTED :
-                $writer->writeElement($cs . 'invite-accepted');
+            case DAV\Sharing\Plugin::INVITE_ACCEPTED:
+                $writer->writeElement($cs.'invite-accepted');
                 break;
-            case DAV\Sharing\Plugin::INVITE_DECLINED :
-                $writer->writeElement($cs . 'invite-declined');
+            case DAV\Sharing\Plugin::INVITE_DECLINED:
+                $writer->writeElement($cs.'invite-declined');
                 break;
-
         }
 
-        $writer->writeElement($cs . 'hosturl', [
-            '{DAV:}href' => $writer->contextUri . $this->hostUrl
+        $writer->writeElement($cs.'hosturl', [
+            '{DAV:}href' => $writer->contextUri.$this->hostUrl,
             ]);
 
         if ($this->summary) {
-            $writer->writeElement($cs . 'summary', $this->summary);
+            $writer->writeElement($cs.'summary', $this->summary);
         }
         $writer->endElement(); // invite-reply
-
     }
 
     /**
-     * Returns a unique id for this notification
+     * Returns a unique id for this notification.
      *
      * This is just the base url. This should generally be some kind of unique
      * id.
      *
      * @return string
      */
-    function getId() {
-
+    public function getId()
+    {
         return $this->id;
-
     }
 
     /**
@@ -204,10 +198,8 @@ class InviteReply implements NotificationInterface {
      *
      * @return string
      */
-    function getETag() {
-
+    public function getETag()
+    {
         return $this->etag;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Notification/NotificationInterface.php b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/NotificationInterface.php
index b98f9c888..be7490533 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Notification/NotificationInterface.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/NotificationInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Notification;
 
 use Sabre\Xml\Writer;
@@ -12,26 +14,25 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface NotificationInterface extends XmlSerializable {
-
+interface NotificationInterface extends XmlSerializable
+{
     /**
      * This method serializes the entire notification, as it is used in the
      * response body.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerializeFull(Writer $writer);
+    public function xmlSerializeFull(Writer $writer);
 
     /**
-     * Returns a unique id for this notification
+     * Returns a unique id for this notification.
      *
      * This is just the base url. This should generally be some kind of unique
      * id.
      *
      * @return string
      */
-    function getId();
+    public function getId();
 
     /**
      * Returns the ETag for this notification.
@@ -40,6 +41,5 @@ interface NotificationInterface extends XmlSerializable {
      *
      * @return string
      */
-    function getETag();
-
+    public function getETag();
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Notification/SystemStatus.php b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/SystemStatus.php
index 8c945dd68..3c656df34 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Notification/SystemStatus.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Notification/SystemStatus.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Notification;
 
 use Sabre\CalDAV\Plugin;
 use Sabre\Xml\Writer;
 
 /**
- * SystemStatus notification
+ * SystemStatus notification.
  *
  * This notification can be used to indicate to the user that the system is
  * down.
@@ -15,14 +17,14 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SystemStatus implements NotificationInterface {
-
+class SystemStatus implements NotificationInterface
+{
     const TYPE_LOW = 1;
     const TYPE_MEDIUM = 2;
     const TYPE_HIGH = 3;
 
     /**
-     * A unique id
+     * A unique id.
      *
      * @var string
      */
@@ -50,7 +52,7 @@ class SystemStatus implements NotificationInterface {
     protected $href;
 
     /**
-     * Notification Etag
+     * Notification Etag.
      *
      * @var string
      */
@@ -64,18 +66,17 @@ class SystemStatus implements NotificationInterface {
      *
      * @param string $id
      * @param string $etag
-     * @param int $type
+     * @param int    $type
      * @param string $description
      * @param string $href
      */
-    function __construct($id, $etag, $type = self::TYPE_HIGH, $description = null, $href = null) {
-
+    public function __construct($id, $etag, $type = self::TYPE_HIGH, $description = null, $href = null)
+    {
         $this->id = $id;
         $this->type = $type;
         $this->description = $description;
         $this->href = $href;
         $this->etag = $etag;
-
     }
 
     /**
@@ -91,27 +92,25 @@ class SystemStatus implements NotificationInterface {
      * responsible for closing them.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         switch ($this->type) {
-            case self::TYPE_LOW :
+            case self::TYPE_LOW:
                 $type = 'low';
                 break;
-            case self::TYPE_MEDIUM :
+            case self::TYPE_MEDIUM:
                 $type = 'medium';
                 break;
-            default :
-            case self::TYPE_HIGH :
+            default:
+            case self::TYPE_HIGH:
                 $type = 'high';
                 break;
         }
 
-        $writer->startElement('{' . Plugin::NS_CALENDARSERVER . '}systemstatus');
+        $writer->startElement('{'.Plugin::NS_CALENDARSERVER.'}systemstatus');
         $writer->writeAttribute('type', $type);
         $writer->endElement();
-
     }
 
     /**
@@ -119,51 +118,47 @@ class SystemStatus implements NotificationInterface {
      * response body.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerializeFull(Writer $writer) {
-
-        $cs = '{' . Plugin::NS_CALENDARSERVER . '}';
+    public function xmlSerializeFull(Writer $writer)
+    {
+        $cs = '{'.Plugin::NS_CALENDARSERVER.'}';
         switch ($this->type) {
-            case self::TYPE_LOW :
+            case self::TYPE_LOW:
                 $type = 'low';
                 break;
-            case self::TYPE_MEDIUM :
+            case self::TYPE_MEDIUM:
                 $type = 'medium';
                 break;
-            default :
-            case self::TYPE_HIGH :
+            default:
+            case self::TYPE_HIGH:
                 $type = 'high';
                 break;
         }
 
-        $writer->startElement($cs . 'systemstatus');
+        $writer->startElement($cs.'systemstatus');
         $writer->writeAttribute('type', $type);
 
-
         if ($this->description) {
-            $writer->writeElement($cs . 'description', $this->description);
+            $writer->writeElement($cs.'description', $this->description);
         }
         if ($this->href) {
             $writer->writeElement('{DAV:}href', $this->href);
         }
 
         $writer->endElement(); // systemstatus
-
     }
 
     /**
-     * Returns a unique id for this notification
+     * Returns a unique id for this notification.
      *
      * This is just the base url. This should generally be some kind of unique
      * id.
      *
      * @return string
      */
-    function getId() {
-
+    public function getId()
+    {
         return $this->id;
-
     }
 
     /*
@@ -173,10 +168,8 @@ class SystemStatus implements NotificationInterface {
      *
      * @return string
      */
-    function getETag() {
-
+    public 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
index 54e5a116a..224f52c96 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Property/AllowedSharingModes.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/AllowedSharingModes.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Property;
 
 use Sabre\CalDAV\Plugin;
@@ -7,7 +9,7 @@ use Sabre\Xml\Writer;
 use Sabre\Xml\XmlSerializable;
 
 /**
- * AllowedSharingModes
+ * AllowedSharingModes.
  *
  * This property encodes the 'allowed-sharing-modes' property, as defined by
  * the 'caldav-sharing-02' spec, in the http://calendarserver.org/ns/
@@ -18,14 +20,15 @@ use Sabre\Xml\XmlSerializable;
  * 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 {
-
+class AllowedSharingModes implements XmlSerializable
+{
     /**
-     * Whether or not a calendar can be shared with another user
+     * Whether or not a calendar can be shared with another user.
      *
      * @var bool
      */
@@ -39,17 +42,15 @@ class AllowedSharingModes implements XmlSerializable {
     protected $canBePublished;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param bool $canBeShared
      * @param bool $canBePublished
-     * @return void
      */
-    function __construct($canBeShared, $canBePublished) {
-
+    public function __construct($canBeShared, $canBePublished)
+    {
         $this->canBeShared = $canBeShared;
         $this->canBePublished = $canBePublished;
-
     }
 
     /**
@@ -69,19 +70,14 @@ class AllowedSharingModes implements XmlSerializable {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         if ($this->canBeShared) {
-            $writer->writeElement('{' . Plugin::NS_CALENDARSERVER . '}can-be-shared');
+            $writer->writeElement('{'.Plugin::NS_CALENDARSERVER.'}can-be-shared');
         }
         if ($this->canBePublished) {
-            $writer->writeElement('{' . Plugin::NS_CALENDARSERVER . '}can-be-published');
+            $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
index fc6f1d505..6b28d5df2 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Property/EmailAddressSet.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/EmailAddressSet.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Property;
 
 use Sabre\Xml\Writer;
 use Sabre\Xml\XmlSerializable;
 
 /**
- * email-address-set property
+ * email-address-set property.
  *
  * This property represents the email-address-set property in the
  * http://calendarserver.org/ns/ namespace.
@@ -17,35 +19,33 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class EmailAddressSet implements XmlSerializable {
-
+class EmailAddressSet implements XmlSerializable
+{
     /**
-     * emails
+     * emails.
      *
      * @var array
      */
     private $emails;
 
     /**
-     * __construct
+     * __construct.
      *
      * @param array $emails
      */
-    function __construct(array $emails) {
-
+    public function __construct(array $emails)
+    {
         $this->emails = $emails;
-
     }
 
     /**
-     * Returns the email addresses
+     * Returns the email addresses.
      *
      * @return array
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->emails;
-
     }
 
     /**
@@ -65,16 +65,11 @@ class EmailAddressSet implements XmlSerializable {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public 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
index 4f33c464c..db456617c 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/Invite.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Property;
 
 use Sabre\CalDAV\Plugin;
@@ -9,19 +11,20 @@ use Sabre\Xml\Writer;
 use Sabre\Xml\XmlSerializable;
 
 /**
- * Invite property
+ * 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 XmlSerializable {
-
+class Invite implements XmlSerializable
+{
     /**
      * The list of users a calendar has been shared to.
      *
@@ -34,10 +37,9 @@ class Invite implements XmlSerializable {
      *
      * @param Sharee[] $sharees
      */
-    function __construct(array $sharees) {
-
+    public function __construct(array $sharees)
+    {
         $this->sharees = $sharees;
-
     }
 
     /**
@@ -45,10 +47,9 @@ class Invite implements XmlSerializable {
      *
      * @return array
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->sharees;
-
     }
 
     /**
@@ -68,61 +69,54 @@ class Invite implements XmlSerializable {
      * 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 . '}';
+    public function xmlSerialize(Writer $writer)
+    {
+        $cs = '{'.Plugin::NS_CALENDARSERVER.'}';
 
         foreach ($this->sharees as $sharee) {
-
-            if ($sharee->access === DAV\Sharing\Plugin::ACCESS_SHAREDOWNER) {
-                $writer->startElement($cs . 'organizer');
+            if (DAV\Sharing\Plugin::ACCESS_SHAREDOWNER === $sharee->access) {
+                $writer->startElement($cs.'organizer');
             } else {
-                $writer->startElement($cs . 'user');
+                $writer->startElement($cs.'user');
 
                 switch ($sharee->inviteStatus) {
-                    case DAV\Sharing\Plugin::INVITE_ACCEPTED :
-                        $writer->writeElement($cs . 'invite-accepted');
+                    case DAV\Sharing\Plugin::INVITE_ACCEPTED:
+                        $writer->writeElement($cs.'invite-accepted');
                         break;
-                    case DAV\Sharing\Plugin::INVITE_DECLINED :
-                        $writer->writeElement($cs . 'invite-declined');
+                    case DAV\Sharing\Plugin::INVITE_DECLINED:
+                        $writer->writeElement($cs.'invite-declined');
                         break;
-                    case DAV\Sharing\Plugin::INVITE_NORESPONSE :
-                        $writer->writeElement($cs . 'invite-noresponse');
+                    case DAV\Sharing\Plugin::INVITE_NORESPONSE:
+                        $writer->writeElement($cs.'invite-noresponse');
                         break;
-                    case DAV\Sharing\Plugin::INVITE_INVALID :
-                        $writer->writeElement($cs . 'invite-invalid');
+                    case DAV\Sharing\Plugin::INVITE_INVALID:
+                        $writer->writeElement($cs.'invite-invalid');
                         break;
                 }
 
-                $writer->startElement($cs . 'access');
+                $writer->startElement($cs.'access');
                 switch ($sharee->access) {
-                    case DAV\Sharing\Plugin::ACCESS_READWRITE :
-                        $writer->writeElement($cs . 'read-write');
+                    case DAV\Sharing\Plugin::ACCESS_READWRITE:
+                        $writer->writeElement($cs.'read-write');
                         break;
-                    case DAV\Sharing\Plugin::ACCESS_READ :
-                        $writer->writeElement($cs . 'read');
+                    case DAV\Sharing\Plugin::ACCESS_READ:
+                        $writer->writeElement($cs.'read');
                         break;
-
                 }
                 $writer->endElement(); // access
-
             }
 
             $href = new DAV\Xml\Property\Href($sharee->href);
             $href->xmlSerialize($writer);
 
             if (isset($sharee->properties['{DAV:}displayname'])) {
-                $writer->writeElement($cs . 'common-name', $sharee->properties['{DAV:}displayname']);
+                $writer->writeElement($cs.'common-name', $sharee->properties['{DAV:}displayname']);
             }
             if ($sharee->comment) {
-                $writer->writeElement($cs . 'summary', $sharee->comment);
+                $writer->writeElement($cs.'summary', $sharee->comment);
             }
             $writer->endElement(); // organizer or user
-
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php b/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php
index 10c20be55..780907169 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/ScheduleCalendarTransp.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Property;
 
 use Sabre\CalDAV\Plugin;
@@ -24,41 +26,39 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ScheduleCalendarTransp implements Element {
-
+class ScheduleCalendarTransp implements Element
+{
     const TRANSPARENT = 'transparent';
     const OPAQUE = 'opaque';
 
     /**
-     * value
+     * value.
      *
      * @var string
      */
     protected $value;
 
     /**
-     * Creates the property
+     * Creates the property.
      *
      * @param string $value
      */
-    function __construct($value) {
-
-        if ($value !== self::TRANSPARENT && $value !== self::OPAQUE) {
+    public function __construct($value)
+    {
+        if (self::TRANSPARENT !== $value && self::OPAQUE !== $value) {
             throw new \InvalidArgumentException('The value must either be specified as "transparent" or "opaque"');
         }
         $this->value = $value;
-
     }
 
     /**
-     * Returns the current value
+     * Returns the current value.
      *
      * @return string
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->value;
-
     }
 
     /**
@@ -78,19 +78,17 @@ class ScheduleCalendarTransp implements Element {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         switch ($this->value) {
-            case self::TRANSPARENT :
-                $writer->writeElement('{' . Plugin::NS_CALDAV . '}transparent');
+            case self::TRANSPARENT:
+                $writer->writeElement('{'.Plugin::NS_CALDAV.'}transparent');
                 break;
-            case self::OPAQUE :
-                $writer->writeElement('{' . Plugin::NS_CALDAV . '}opaque');
+            case self::OPAQUE:
+                $writer->writeElement('{'.Plugin::NS_CALDAV.'}opaque');
                 break;
         }
-
     }
 
     /**
@@ -112,10 +110,11 @@ class ScheduleCalendarTransp implements Element {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $elems = Deserializer\enum($reader, Plugin::NS_CALDAV);
 
         if (in_array('transparent', $elems)) {
@@ -123,8 +122,7 @@ class ScheduleCalendarTransp implements Element {
         } else {
             $value = self::OPAQUE;
         }
-        return new self($value);
 
+        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
index 7fc25c5f0..56fa61b13 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarComponentSet.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarComponentSet.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Property;
 
 use Sabre\CalDAV\Plugin;
@@ -21,8 +23,8 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SupportedCalendarComponentSet implements Element {
-
+class SupportedCalendarComponentSet implements Element
+{
     /**
      * List of supported components.
      *
@@ -37,21 +39,19 @@ class SupportedCalendarComponentSet implements Element {
      *
      * @param array $components
      */
-    function __construct(array $components) {
-
+    public function __construct(array $components)
+    {
         $this->components = $components;
-
     }
 
     /**
-     * Returns the list of supported components
+     * Returns the list of supported components.
      *
      * @return array
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->components;
-
     }
 
     /**
@@ -71,18 +71,14 @@ class SupportedCalendarComponentSet implements Element {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->components as $component) {
-
-            $writer->startElement('{' . Plugin::NS_CALDAV . '}comp');
+            $writer->startElement('{'.Plugin::NS_CALDAV.'}comp');
             $writer->writeAttributes(['name' => $component]);
             $writer->endElement();
-
         }
-
     }
 
     /**
@@ -104,16 +100,17 @@ class SupportedCalendarComponentSet implements Element {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $elems = $reader->parseInnerTree();
 
         $components = [];
 
-        foreach ((array)$elems as $elem) {
-            if ($elem['name'] === '{' . Plugin::NS_CALDAV . '}comp') {
+        foreach ((array) $elems as $elem) {
+            if ($elem['name'] === '{'.Plugin::NS_CALDAV.'}comp') {
                 $components[] = $elem['attributes']['name'];
             }
         }
@@ -123,7 +120,5 @@ class SupportedCalendarComponentSet implements 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
index d123ba4c0..1c9c4779f 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarData.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCalendarData.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Property;
 
 use Sabre\CalDAV\Plugin;
@@ -7,7 +9,7 @@ use Sabre\Xml\Writer;
 use Sabre\Xml\XmlSerializable;
 
 /**
- * Supported-calendar-data property
+ * 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
@@ -20,8 +22,8 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SupportedCalendarData implements XmlSerializable {
-
+class SupportedCalendarData implements XmlSerializable
+{
     /**
      * The xmlSerialize method is called during xml writing.
      *
@@ -39,22 +41,19 @@ class SupportedCalendarData implements XmlSerializable {
      * 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');
+    public function xmlSerialize(Writer $writer)
+    {
+        $writer->startElement('{'.Plugin::NS_CALDAV.'}calendar-data');
         $writer->writeAttributes([
             'content-type' => 'text/calendar',
-            'version'      => '2.0',
+            'version' => '2.0',
         ]);
         $writer->endElement(); // calendar-data
-        $writer->startElement('{' . Plugin::NS_CALDAV . '}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
index af10860d0..b88cd0d92 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCollationSet.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Property/SupportedCollationSet.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Property;
 
 use Sabre\CalDAV\Plugin;
@@ -7,7 +9,7 @@ use Sabre\Xml\Writer;
 use Sabre\Xml\XmlSerializable;
 
 /**
- * supported-collation-set property
+ * supported-collation-set property.
  *
  * This property is a representation of the supported-collation-set property
  * in the CalDAV namespace.
@@ -19,8 +21,8 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SupportedCollationSet implements XmlSerializable {
-
+class SupportedCollationSet implements XmlSerializable
+{
     /**
      * The xmlSerialize method is called during xml writing.
      *
@@ -38,20 +40,17 @@ class SupportedCollationSet implements XmlSerializable {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         $collations = [
             'i;ascii-casemap',
             'i;octet',
-            'i;unicode-casemap'
+            'i;unicode-casemap',
         ];
 
         foreach ($collations as $collation) {
-            $writer->writeElement('{' . Plugin::NS_CALDAV . '}supported-collation', $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
index 6d3c5d508..8231de6bd 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarMultiGetReport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarMultiGetReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Request;
 
 use Sabre\CalDAV\Plugin;
@@ -19,8 +21,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CalendarMultiGetReport implements XmlDeserializable {
-
+class CalendarMultiGetReport implements XmlDeserializable
+{
     /**
      * An array with requested properties.
      *
@@ -80,36 +82,33 @@ class CalendarMultiGetReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public 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',
+            '{DAV:}prop' => 'Sabre\\Xml\\Element\\KeyValue',
         ]);
 
         $newProps = [
-            'hrefs'      => [],
+            'hrefs' => [],
             'properties' => [],
         ];
 
         foreach ($elems as $elem) {
-
             switch ($elem['name']) {
-
-                case '{DAV:}prop' :
+                case '{DAV:}prop':
                     $newProps['properties'] = array_keys($elem['value']);
-                    if (isset($elem['value']['{' . Plugin::NS_CALDAV . '}calendar-data'])) {
-                        $newProps += $elem['value']['{' . Plugin::NS_CALDAV . '}calendar-data'];
+                    if (isset($elem['value']['{'.Plugin::NS_CALDAV.'}calendar-data'])) {
+                        $newProps += $elem['value']['{'.Plugin::NS_CALDAV.'}calendar-data'];
                     }
                     break;
-                case '{DAV:}href' :
+                case '{DAV:}href':
                     $newProps['hrefs'][] = Uri\resolve($reader->contextUri, $elem['value']);
                     break;
-
             }
-
         }
 
         $obj = new self();
@@ -118,7 +117,5 @@ class CalendarMultiGetReport implements XmlDeserializable {
         }
 
         return $obj;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarQueryReport.php b/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarQueryReport.php
index e0b1c7950..e85eccd2d 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarQueryReport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/CalendarQueryReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Request;
 
 use Sabre\CalDAV\Plugin;
@@ -19,8 +21,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CalendarQueryReport implements XmlDeserializable {
-
+class CalendarQueryReport implements XmlDeserializable
+{
     /**
      * An array with requested properties.
      *
@@ -80,38 +82,39 @@ class CalendarQueryReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public 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}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',
+            '{DAV:}prop' => 'Sabre\\Xml\\Element\\KeyValue',
         ]);
 
         $newProps = [
-            'filters'    => null,
+            'filters' => null,
             'properties' => [],
         ];
 
-        if (!is_array($elems)) $elems = [];
+        if (!is_array($elems)) {
+            $elems = [];
+        }
 
         foreach ($elems as $elem) {
-
             switch ($elem['name']) {
-
-                case '{DAV:}prop' :
+                case '{DAV:}prop':
                     $newProps['properties'] = array_keys($elem['value']);
-                    if (isset($elem['value']['{' . Plugin::NS_CALDAV . '}calendar-data'])) {
-                        $newProps += $elem['value']['{' . Plugin::NS_CALDAV . '}calendar-data'];
+                    if (isset($elem['value']['{'.Plugin::NS_CALDAV.'}calendar-data'])) {
+                        $newProps += $elem['value']['{'.Plugin::NS_CALDAV.'}calendar-data'];
                     }
                     break;
-                case '{' . Plugin::NS_CALDAV . '}filter' :
+                case '{'.Plugin::NS_CALDAV.'}filter':
                     foreach ($elem['value'] as $subElem) {
-                        if ($subElem['name'] === '{' . Plugin::NS_CALDAV . '}comp-filter') {
+                        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');
                             }
@@ -119,21 +122,18 @@ class CalendarQueryReport implements XmlDeserializable {
                         }
                     }
                     break;
-
             }
-
         }
 
         if (is_null($newProps['filters'])) {
-            throw new BadRequest('The {' . Plugin::NS_CALDAV . '}filter element is required for this request');
+            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;
 
+        return $obj;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CalDAV/Xml/Request/FreeBusyQueryReport.php b/vendor/sabre/dav/lib/CalDAV/Xml/Request/FreeBusyQueryReport.php
index 0f6c1e074..a4d98a8d4 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Request/FreeBusyQueryReport.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/FreeBusyQueryReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Request;
 
 use Sabre\CalDAV\Plugin;
@@ -9,7 +11,7 @@ use Sabre\Xml\Reader;
 use Sabre\Xml\XmlDeserializable;
 
 /**
- * FreeBusyQueryReport
+ * FreeBusyQueryReport.
  *
  * This class parses the {DAV:}free-busy-query REPORT, as defined in:
  *
@@ -19,19 +21,19 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class FreeBusyQueryReport implements XmlDeserializable {
-
+class FreeBusyQueryReport implements XmlDeserializable
+{
     /**
-     * Starttime of report
+     * Starttime of report.
      *
-     * @var DateTime|null
+     * @var \DateTime|null
      */
     public $start;
 
     /**
-     * End time of report
+     * End time of report.
      *
-     * @var DateTime|null
+     * @var \DateTime|null
      */
     public $end;
 
@@ -54,22 +56,23 @@ class FreeBusyQueryReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
-        $timeRange = '{' . Plugin::NS_CALDAV . '}time-range';
+    public 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;
+        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');
@@ -85,7 +88,5 @@ class FreeBusyQueryReport implements XmlDeserializable {
         $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
index db32cc6a5..710095bb2 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Request/InviteReply.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/InviteReply.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Request;
 
 use Sabre\CalDAV\Plugin;
@@ -11,7 +13,7 @@ use Sabre\Xml\Reader;
 use Sabre\Xml\XmlDeserializable;
 
 /**
- * Invite-reply POST request parser
+ * Invite-reply POST request parser.
  *
  * This class parses the invite-reply POST request, as defined in:
  *
@@ -21,8 +23,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class InviteReply implements XmlDeserializable {
-
+class InviteReply implements XmlDeserializable
+{
     /**
      * The sharee calendar user address.
      *
@@ -40,14 +42,14 @@ class InviteReply implements XmlDeserializable {
     public $calendarUri;
 
     /**
-     * The id of the invite message that's being responded to
+     * The id of the invite message that's being responded to.
      *
      * @var string
      */
     public $inReplyTo;
 
     /**
-     * An optional message
+     * An optional message.
      *
      * @var string
      */
@@ -61,22 +63,21 @@ class InviteReply implements XmlDeserializable {
     public $status;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param string $href
      * @param string $calendarUri
      * @param string $inReplyTo
      * @param string $summary
-     * @param int $status
+     * @param int    $status
      */
-    function __construct($href, $calendarUri, $inReplyTo, $summary, $status) {
-
+    public function __construct($href, $calendarUri, $inReplyTo, $summary, $status)
+    {
         $this->href = $href;
         $this->calendarUri = $calendarUri;
         $this->inReplyTo = $inReplyTo;
         $this->summary = $summary;
         $this->status = $status;
-
     }
 
     /**
@@ -98,10 +99,11 @@ class InviteReply implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $elems = KeyValue::xmlDeserialize($reader);
 
         $href = null;
@@ -111,40 +113,35 @@ class InviteReply implements XmlDeserializable {
         $status = null;
 
         foreach ($elems as $name => $value) {
-
             switch ($name) {
-
-                case '{' . Plugin::NS_CALENDARSERVER . '}hosturl' :
+                case '{'.Plugin::NS_CALENDARSERVER.'}hosturl':
                     foreach ($value as $bla) {
-                        if ($bla['name'] === '{DAV:}href') {
+                        if ('{DAV:}href' === $bla['name']) {
                             $calendarUri = $bla['value'];
                         }
                     }
                     break;
-                case '{' . Plugin::NS_CALENDARSERVER . '}invite-accepted' :
+                case '{'.Plugin::NS_CALENDARSERVER.'}invite-accepted':
                     $status = DAV\Sharing\Plugin::INVITE_ACCEPTED;
                     break;
-                case '{' . Plugin::NS_CALENDARSERVER . '}invite-declined' :
+                case '{'.Plugin::NS_CALENDARSERVER.'}invite-declined':
                     $status = DAV\Sharing\Plugin::INVITE_DECLINED;
                     break;
-                case '{' . Plugin::NS_CALENDARSERVER . '}in-reply-to' :
+                case '{'.Plugin::NS_CALENDARSERVER.'}in-reply-to':
                     $inReplyTo = $value;
                     break;
-                case '{' . Plugin::NS_CALENDARSERVER . '}summary' :
+                case '{'.Plugin::NS_CALENDARSERVER.'}summary':
                     $summary = $value;
                     break;
-                case '{DAV:}href' :
+                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
index ce7fafde9..7cad98da5 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Request/MkCalendar.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/MkCalendar.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Request;
 
 use Sabre\Xml\Reader;
@@ -16,8 +18,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class MkCalendar implements XmlDeserializable {
-
+class MkCalendar implements XmlDeserializable
+{
     /**
      * The list of properties that will be set.
      *
@@ -30,10 +32,9 @@ class MkCalendar implements XmlDeserializable {
      *
      * @return array
      */
-    function getProperties() {
-
+    public function getProperties()
+    {
         return $this->properties;
-
     }
 
     /**
@@ -55,10 +56,11 @@ class MkCalendar implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $self = new self();
 
         $elementMap = $reader->elementMap;
@@ -67,13 +69,11 @@ class MkCalendar implements XmlDeserializable {
         $elems = $reader->parseInnerTree($elementMap);
 
         foreach ($elems as $elem) {
-            if ($elem['name'] === '{DAV:}set') {
+            if ('{DAV:}set' === $elem['name']) {
                 $self->properties = array_merge($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
index e0bd8e0af..60bd579d5 100644
--- a/vendor/sabre/dav/lib/CalDAV/Xml/Request/Share.php
+++ b/vendor/sabre/dav/lib/CalDAV/Xml/Request/Share.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CalDAV\Xml\Request;
 
 use Sabre\CalDAV\Plugin;
@@ -8,7 +10,7 @@ use Sabre\Xml\Reader;
 use Sabre\Xml\XmlDeserializable;
 
 /**
- * Share POST request parser
+ * Share POST request parser.
  *
  * This class parses the share POST request, as defined in:
  *
@@ -18,8 +20,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Share implements XmlDeserializable {
-
+class Share implements XmlDeserializable
+{
     /**
      * The list of new people added or updated or removed from the share.
      *
@@ -28,14 +30,13 @@ class Share implements XmlDeserializable {
     public $sharees = [];
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param Sharee[] $sharees
      */
-    function __construct(array $sharees) {
-
+    public function __construct(array $sharees)
+    {
         $this->sharees = $sharees;
-
     }
 
     /**
@@ -57,55 +58,52 @@ class Share implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $elems = $reader->parseGetElements([
-            '{' . Plugin::NS_CALENDARSERVER . '}set'    => 'Sabre\\Xml\\Element\\KeyValue',
-            '{' . Plugin::NS_CALENDARSERVER . '}remove' => 'Sabre\\Xml\\Element\\KeyValue',
+            '{'.Plugin::NS_CALENDARSERVER.'}set' => 'Sabre\\Xml\\Element\\KeyValue',
+            '{'.Plugin::NS_CALENDARSERVER.'}remove' => 'Sabre\\Xml\\Element\\KeyValue',
         ]);
 
         $sharees = [];
 
         foreach ($elems as $elem) {
             switch ($elem['name']) {
-
-                case '{' . Plugin::NS_CALENDARSERVER . '}set' :
+                case '{'.Plugin::NS_CALENDARSERVER.'}set':
                     $sharee = $elem['value'];
 
-                    $sumElem = '{' . Plugin::NS_CALENDARSERVER . '}summary';
-                    $commonName = '{' . Plugin::NS_CALENDARSERVER . '}common-name';
+                    $sumElem = '{'.Plugin::NS_CALENDARSERVER.'}summary';
+                    $commonName = '{'.Plugin::NS_CALENDARSERVER.'}common-name';
 
                     $properties = [];
                     if (isset($sharee[$commonName])) {
                         $properties['{DAV:}displayname'] = $sharee[$commonName];
                     }
 
-                    $access = array_key_exists('{' . Plugin::NS_CALENDARSERVER . '}read-write', $sharee)
+                    $access = array_key_exists('{'.Plugin::NS_CALENDARSERVER.'}read-write', $sharee)
                         ? \Sabre\DAV\Sharing\Plugin::ACCESS_READWRITE
                         : \Sabre\DAV\Sharing\Plugin::ACCESS_READ;
 
                     $sharees[] = new Sharee([
-                        'href'       => $sharee['{DAV:}href'],
+                        'href' => $sharee['{DAV:}href'],
                         'properties' => $properties,
-                        'access'     => $access,
-                        'comment'    => isset($sharee[$sumElem]) ? $sharee[$sumElem] : null
+                        'access' => $access,
+                        'comment' => isset($sharee[$sumElem]) ? $sharee[$sumElem] : null,
                     ]);
                     break;
 
-                case '{' . Plugin::NS_CALENDARSERVER . '}remove' :
+                case '{'.Plugin::NS_CALENDARSERVER.'}remove':
                     $sharees[] = new Sharee([
-                        'href'   => $elem['value']['{DAV:}href'],
-                        'access' => \Sabre\DAV\Sharing\Plugin::ACCESS_NOACCESS
+                        'href' => $elem['value']['{DAV:}href'],
+                        'access' => \Sabre\DAV\Sharing\Plugin::ACCESS_NOACCESS,
                     ]);
                     break;
-
             }
         }
 
         return new self($sharees);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/AddressBook.php b/vendor/sabre/dav/lib/CardDAV/AddressBook.php
index c9d28a091..434801554 100644
--- a/vendor/sabre/dav/lib/CardDAV/AddressBook.php
+++ b/vendor/sabre/dav/lib/CardDAV/AddressBook.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV;
 
 use Sabre\DAV;
 use Sabre\DAVACL;
 
 /**
- * The AddressBook class represents a CardDAV addressbook, owned by a specific user
+ * The AddressBook class represents a CardDAV addressbook, owned by a specific user.
  *
  * The AddressBook can contain multiple vcards
  *
@@ -14,77 +16,78 @@ use Sabre\DAVACL;
  * @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 {
-
+class AddressBook extends DAV\Collection implements IAddressBook, DAV\IProperties, DAVACL\IACL, DAV\Sync\ISyncCollection, DAV\IMultiGet
+{
     use DAVACL\ACLTrait;
 
     /**
-     * This is an array with addressbook information
+     * This is an array with addressbook information.
      *
      * @var array
      */
     protected $addressBookInfo;
 
     /**
-     * CardDAV backend
+     * CardDAV backend.
      *
      * @var Backend\BackendInterface
      */
     protected $carddavBackend;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param Backend\BackendInterface $carddavBackend
-     * @param array $addressBookInfo
+     * @param array                    $addressBookInfo
      */
-    function __construct(Backend\BackendInterface $carddavBackend, array $addressBookInfo) {
-
+    public function __construct(Backend\BackendInterface $carddavBackend, array $addressBookInfo)
+    {
         $this->carddavBackend = $carddavBackend;
         $this->addressBookInfo = $addressBookInfo;
-
     }
 
     /**
-     * Returns the name of the addressbook
+     * Returns the name of the addressbook.
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return $this->addressBookInfo['uri'];
-
     }
 
     /**
-     * Returns a card
+     * Returns a card.
      *
      * @param string $name
+     *
      * @return Card
      */
-    function getChild($name) {
-
+    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, $obj);
+        if (!$obj) {
+            throw new DAV\Exception\NotFound('Card not found');
+        }
 
+        return new Card($this->carddavBackend, $this->addressBookInfo, $obj);
     }
 
     /**
-     * Returns the full list of cards
+     * Returns the full list of cards.
      *
      * @return array
      */
-    function getChildren() {
-
+    public 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;
 
+        return $children;
     }
 
     /**
@@ -94,47 +97,47 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
      * If any children are not found, you do not have to return them.
      *
      * @param string[] $paths
+     *
      * @return array
      */
-    function getMultipleChildren(array $paths) {
-
+    public 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;
 
+        return $children;
     }
 
     /**
-     * Creates a new directory
+     * Creates a new directory.
      *
      * We actually block this, as subdirectories are not allowed in addressbooks.
      *
      * @param string $name
-     * @return void
      */
-    function createDirectory($name) {
-
+    public function createDirectory($name)
+    {
         throw new DAV\Exception\MethodNotAllowed('Creating collections in addressbooks is not allowed');
-
     }
 
     /**
-     * Creates a new file
+     * 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 string   $name
      * @param resource $vcardData
+     *
      * @return string|null
      */
-    function createFile($name, $vcardData = null) {
-
+    public function createFile($name, $vcardData = null)
+    {
         if (is_resource($vcardData)) {
             $vcardData = stream_get_contents($vcardData);
         }
@@ -142,41 +145,32 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
         $vcardData = DAV\StringUtil::ensureUTF8($vcardData);
 
         return $this->carddavBackend->createCard($this->addressBookInfo['id'], $name, $vcardData);
-
     }
 
     /**
      * Deletes the entire addressbook.
-     *
-     * @return void
      */
-    function delete() {
-
+    public function delete()
+    {
         $this->carddavBackend->deleteAddressBook($this->addressBookInfo['id']);
-
     }
 
     /**
-     * Renames the addressbook
+     * Renames the addressbook.
      *
      * @param string $newName
-     * @return void
      */
-    function setName($newName) {
-
+    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
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         return null;
-
     }
 
     /**
@@ -189,12 +183,10 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
      * Read the PropPatch documentation for more information.
      *
      * @param DAV\PropPatch $propPatch
-     * @return void
      */
-    function propPatch(DAV\PropPatch $propPatch) {
-
+    public function propPatch(DAV\PropPatch $propPatch)
+    {
         return $this->carddavBackend->updateAddressBook($this->addressBookInfo['id'], $propPatch);
-
     }
 
     /**
@@ -206,39 +198,33 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
      * If the array is empty, it means 'all properties' were requested.
      *
      * @param array $properties
+     *
      * @return array
      */
-    function getProperties($properties) {
-
+    public function getProperties($properties)
+    {
         $response = [];
         foreach ($properties as $propertyName) {
-
             if (isset($this->addressBookInfo[$propertyName])) {
-
                 $response[$propertyName] = $this->addressBookInfo[$propertyName];
-
             }
-
         }
 
         return $response;
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->addressBookInfo['principaluri'];
-
     }
 
-
     /**
      * This method returns the ACL's for card nodes in this address book.
      * The result of this method automatically gets passed to the
@@ -246,8 +232,8 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
      *
      * @return array
      */
-    function getChildACL() {
-
+    public function getChildACL()
+    {
         return [
             [
                 'privilege' => '{DAV:}all',
@@ -255,10 +241,8 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
                 'protected' => true,
             ],
         ];
-
     }
 
-
     /**
      * This method returns the current sync-token for this collection.
      * This can be any string.
@@ -268,8 +252,8 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
      *
      * @return string|null
      */
-    function getSyncToken() {
-
+    public function getSyncToken()
+    {
         if (
             $this->carddavBackend instanceof Backend\SyncSupport &&
             isset($this->addressBookInfo['{DAV:}sync-token'])
@@ -282,7 +266,6 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
         ) {
             return $this->addressBookInfo['{http://sabredav.org/ns}sync-token'];
         }
-
     }
 
     /**
@@ -336,12 +319,13 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
      * The limit is 'suggestive'. You are free to ignore it.
      *
      * @param string $syncToken
-     * @param int $syncLevel
-     * @param int $limit
+     * @param int    $syncLevel
+     * @param int    $limit
+     *
      * @return array
      */
-    function getChanges($syncToken, $syncLevel, $limit = null) {
-
+    public function getChanges($syncToken, $syncLevel, $limit = null)
+    {
         if (!$this->carddavBackend instanceof Backend\SyncSupport) {
             return null;
         }
@@ -352,6 +336,5 @@ class AddressBook extends DAV\Collection implements IAddressBook, DAV\IPropertie
             $syncLevel,
             $limit
         );
-
     }
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/AddressBookHome.php b/vendor/sabre/dav/lib/CardDAV/AddressBookHome.php
index d770c0ffe..fb03000aa 100644
--- a/vendor/sabre/dav/lib/CardDAV/AddressBookHome.php
+++ b/vendor/sabre/dav/lib/CardDAV/AddressBookHome.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV;
 
 use Sabre\DAV;
@@ -8,7 +10,7 @@ use Sabre\DAVACL;
 use Sabre\Uri;
 
 /**
- * AddressBook Home class
+ * AddressBook Home class.
  *
  * This collection contains a list of addressbooks associated with one user.
  *
@@ -16,81 +18,74 @@ use Sabre\Uri;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class AddressBookHome extends DAV\Collection implements DAV\IExtendedCollection, DAVACL\IACL {
-
+class AddressBookHome extends DAV\Collection implements DAV\IExtendedCollection, DAVACL\IACL
+{
     use DAVACL\ACLTrait;
 
     /**
-     * Principal uri
+     * Principal uri.
      *
      * @var array
      */
     protected $principalUri;
 
     /**
-     * carddavBackend
+     * carddavBackend.
      *
      * @var Backend\BackendInterface
      */
     protected $carddavBackend;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param Backend\BackendInterface $carddavBackend
-     * @param string $principalUri
+     * @param string                   $principalUri
      */
-    function __construct(Backend\BackendInterface $carddavBackend, $principalUri) {
-
+    public function __construct(Backend\BackendInterface $carddavBackend, $principalUri)
+    {
         $this->carddavBackend = $carddavBackend;
         $this->principalUri = $principalUri;
-
     }
 
     /**
-     * Returns the name of this object
+     * Returns the name of this object.
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         list(, $name) = Uri\split($this->principalUri);
-        return $name;
 
+        return $name;
     }
 
     /**
-     * Updates the name of this object
+     * Updates the name of this object.
      *
      * @param string $name
-     * @return void
      */
-    function setName($name) {
-
+    public function setName($name)
+    {
         throw new DAV\Exception\MethodNotAllowed();
-
     }
 
     /**
-     * Deletes this object
-     *
-     * @return void
+     * Deletes this object.
      */
-    function delete() {
-
+    public function delete()
+    {
         throw new DAV\Exception\MethodNotAllowed();
-
     }
 
     /**
-     * Returns the last modification date
+     * Returns the last modification date.
      *
      * @return int
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         return null;
-
     }
 
     /**
@@ -98,14 +93,12 @@ class AddressBookHome extends DAV\Collection implements DAV\IExtendedCollection,
      *
      * This is currently not allowed
      *
-     * @param string $filename
+     * @param string   $filename
      * @param resource $data
-     * @return void
      */
-    function createFile($filename, $data = null) {
-
+    public function createFile($filename, $data = null)
+    {
         throw new DAV\Exception\MethodNotAllowed('Creating new files in this collection is not supported');
-
     }
 
     /**
@@ -114,78 +107,74 @@ class AddressBookHome extends DAV\Collection implements DAV\IExtendedCollection,
      * This is currently not allowed.
      *
      * @param string $filename
-     * @return void
      */
-    function createDirectory($filename) {
-
+    public function createDirectory($filename)
+    {
         throw new DAV\Exception\MethodNotAllowed('Creating new collections in this collection is not supported');
-
     }
 
     /**
-     * Returns a single addressbook, by name
+     * Returns a single addressbook, by name.
      *
      * @param string $name
+     *
      * @todo needs optimizing
+     *
      * @return AddressBook
      */
-    function getChild($name) {
-
+    public function getChild($name)
+    {
         foreach ($this->getChildren() as $child) {
-            if ($name == $child->getName())
+            if ($name == $child->getName()) {
                 return $child;
-
+            }
         }
-        throw new DAV\Exception\NotFound('Addressbook with name \'' . $name . '\' could not be found');
-
+        throw new DAV\Exception\NotFound('Addressbook with name \''.$name.'\' could not be found');
     }
 
     /**
-     * Returns a list of addressbooks
+     * Returns a list of addressbooks.
      *
      * @return array
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         $addressbooks = $this->carddavBackend->getAddressBooksForUser($this->principalUri);
         $objs = [];
         foreach ($addressbooks as $addressbook) {
             $objs[] = new AddressBook($this->carddavBackend, $addressbook);
         }
-        return $objs;
 
+        return $objs;
     }
 
     /**
      * Creates a new address book.
      *
      * @param string $name
-     * @param MkCol $mkCol
+     * @param MkCol  $mkCol
+     *
      * @throws DAV\Exception\InvalidResourceType
-     * @return void
      */
-    function createExtendedCollection($name, MkCol $mkCol) {
-
-        if (!$mkCol->hasResourceType('{' . Plugin::NS_CARDDAV . '}addressbook')) {
+    public function createExtendedCollection($name, MkCol $mkCol)
+    {
+        if (!$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);
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->principalUri;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/AddressBookRoot.php b/vendor/sabre/dav/lib/CardDAV/AddressBookRoot.php
index a9f1183da..219f98906 100644
--- a/vendor/sabre/dav/lib/CardDAV/AddressBookRoot.php
+++ b/vendor/sabre/dav/lib/CardDAV/AddressBookRoot.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV;
 
 use Sabre\DAVACL;
 
 /**
- * AddressBook rootnode
+ * AddressBook rootnode.
  *
  * This object lists a collection of users, which can contain addressbooks.
  *
@@ -13,24 +15,24 @@ use Sabre\DAVACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class AddressBookRoot extends DAVACL\AbstractPrincipalCollection {
-
+class AddressBookRoot extends DAVACL\AbstractPrincipalCollection
+{
     /**
-     * Principal Backend
+     * Principal Backend.
      *
      * @var DAVACL\PrincipalBackend\BackendInterface
      */
     protected $principalBackend;
 
     /**
-     * CardDAV backend
+     * CardDAV backend.
      *
      * @var Backend\BackendInterface
      */
     protected $carddavBackend;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * This constructor needs both a principal and a carddav backend.
      *
@@ -40,25 +42,23 @@ class AddressBookRoot extends DAVACL\AbstractPrincipalCollection {
      * to override this.
      *
      * @param DAVACL\PrincipalBackend\BackendInterface $principalBackend
-     * @param Backend\BackendInterface $carddavBackend
-     * @param string $principalPrefix
+     * @param Backend\BackendInterface                 $carddavBackend
+     * @param string                                   $principalPrefix
      */
-    function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, Backend\BackendInterface $carddavBackend, $principalPrefix = 'principals') {
-
+    public function __construct(DAVACL\PrincipalBackend\BackendInterface $principalBackend, Backend\BackendInterface $carddavBackend, $principalPrefix = 'principals')
+    {
         $this->carddavBackend = $carddavBackend;
         parent::__construct($principalBackend, $principalPrefix);
-
     }
 
     /**
-     * Returns the name of the node
+     * Returns the name of the node.
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return Plugin::ADDRESSBOOK_ROOT;
-
     }
 
     /**
@@ -69,12 +69,11 @@ class AddressBookRoot extends DAVACL\AbstractPrincipalCollection {
      * supplied by the authentication backend.
      *
      * @param array $principal
+     *
      * @return \Sabre\DAV\INode
      */
-    function getChildForPrincipal(array $principal) {
-
+    public function getChildForPrincipal(array $principal)
+    {
         return new AddressBookHome($this->carddavBackend, $principal['uri']);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Backend/AbstractBackend.php b/vendor/sabre/dav/lib/CardDAV/Backend/AbstractBackend.php
index 03d2346da..6b041ade4 100644
--- a/vendor/sabre/dav/lib/CardDAV/Backend/AbstractBackend.php
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/AbstractBackend.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Backend;
 
 /**
- * CardDAV abstract Backend
+ * CardDAV abstract Backend.
  *
  * This class serves as a base-class for addressbook backends
  *
@@ -13,8 +15,8 @@ namespace Sabre\CardDAV\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class AbstractBackend implements BackendInterface {
-
+abstract class AbstractBackend implements BackendInterface
+{
     /**
      * Returns a list of cards.
      *
@@ -25,14 +27,13 @@ abstract class AbstractBackend implements BackendInterface {
      *
      * @param mixed $addressBookId
      * @param array $uris
+     *
      * @return array
      */
-    function getMultipleCards($addressBookId, array $uris) {
-
-        return array_map(function($uri) use ($addressBookId) {
+    public function getMultipleCards($addressBookId, array $uris)
+    {
+        return array_map(function ($uri) use ($addressBookId) {
             return $this->getCard($addressBookId, $uri);
         }, $uris);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Backend/BackendInterface.php b/vendor/sabre/dav/lib/CardDAV/Backend/BackendInterface.php
index 18c0c0a99..804f09a36 100644
--- a/vendor/sabre/dav/lib/CardDAV/Backend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/BackendInterface.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Backend;
 
 /**
- * CardDAV Backend Interface
+ * CardDAV Backend Interface.
  *
  * Any CardDAV backend must implement this interface.
  *
@@ -15,8 +17,8 @@ namespace Sabre\CardDAV\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface BackendInterface {
-
+interface BackendInterface
+{
     /**
      * Returns the list of addressbooks for a specific user.
      *
@@ -32,9 +34,10 @@ interface BackendInterface {
      *   {http://calendarserver.org/ns/}getctag
      *
      * @param string $principalUri
+     *
      * @return array
      */
-    function getAddressBooksForUser($principalUri);
+    public function getAddressBooksForUser($principalUri);
 
     /**
      * Updates properties for an address book.
@@ -48,11 +51,10 @@ interface BackendInterface {
      *
      * Read the PropPatch documentation for more info and examples.
      *
-     * @param string $addressBookId
+     * @param string               $addressBookId
      * @param \Sabre\DAV\PropPatch $propPatch
-     * @return void
      */
-    function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch);
+    public function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch);
 
     /**
      * Creates a new address book.
@@ -61,19 +63,19 @@ interface BackendInterface {
      * in any format, including ints, strings, arrays or objects.
      *
      * @param string $principalUri
-     * @param string $url Just the 'basename' of the url.
-     * @param array $properties
+     * @param string $url          just the 'basename' of the url
+     * @param array  $properties
+     *
      * @return mixed
      */
-    function createAddressBook($principalUri, $url, array $properties);
+    public function createAddressBook($principalUri, $url, array $properties);
 
     /**
-     * Deletes an entire addressbook and all its contents
+     * Deletes an entire addressbook and all its contents.
      *
      * @param mixed $addressBookId
-     * @return void
      */
-    function deleteAddressBook($addressBookId);
+    public function deleteAddressBook($addressBookId);
 
     /**
      * Returns all cards for a specific addressbook id.
@@ -92,9 +94,10 @@ interface BackendInterface {
      * This may speed up certain requests, especially with large cards.
      *
      * @param mixed $addressbookId
+     *
      * @return array
      */
-    function getCards($addressbookId);
+    public function getCards($addressbookId);
 
     /**
      * Returns a specfic card.
@@ -104,11 +107,12 @@ interface BackendInterface {
      *
      * If the card does not exist, you must return false.
      *
-     * @param mixed $addressBookId
+     * @param mixed  $addressBookId
      * @param string $cardUri
+     *
      * @return array
      */
-    function getCard($addressBookId, $cardUri);
+    public function getCard($addressBookId, $cardUri);
 
     /**
      * Returns a list of cards.
@@ -120,9 +124,10 @@ interface BackendInterface {
      *
      * @param mixed $addressBookId
      * @param array $uris
+     *
      * @return array
      */
-    function getMultipleCards($addressBookId, array $uris);
+    public function getMultipleCards($addressBookId, array $uris);
 
     /**
      * Creates a new card.
@@ -144,12 +149,13 @@ interface BackendInterface {
      *
      * If you don't return an ETag, you can just return null.
      *
-     * @param mixed $addressBookId
+     * @param mixed  $addressBookId
      * @param string $cardUri
      * @param string $cardData
+     *
      * @return string|null
      */
-    function createCard($addressBookId, $cardUri, $cardData);
+    public function createCard($addressBookId, $cardUri, $cardData);
 
     /**
      * Updates a card.
@@ -171,20 +177,21 @@ interface BackendInterface {
      *
      * If you don't return an ETag, you can just return null.
      *
-     * @param mixed $addressBookId
+     * @param mixed  $addressBookId
      * @param string $cardUri
      * @param string $cardData
+     *
      * @return string|null
      */
-    function updateCard($addressBookId, $cardUri, $cardData);
+    public function updateCard($addressBookId, $cardUri, $cardData);
 
     /**
-     * Deletes a card
+     * Deletes a card.
      *
-     * @param mixed $addressBookId
+     * @param mixed  $addressBookId
      * @param string $cardUri
+     *
      * @return bool
      */
-    function deleteCard($addressBookId, $cardUri);
-
+    public function deleteCard($addressBookId, $cardUri);
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php b/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php
index 13487e9da..0659455e5 100644
--- a/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/PDO.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Backend;
 
 use Sabre\CardDAV;
 use Sabre\DAV;
 
 /**
- * PDO CardDAV backend
+ * PDO CardDAV backend.
  *
  * This CardDAV backend uses PDO to store addressbooks
  *
@@ -14,22 +16,22 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PDO extends AbstractBackend implements SyncSupport {
-
+class PDO extends AbstractBackend implements SyncSupport
+{
     /**
-     * PDO connection
+     * PDO connection.
      *
      * @var PDO
      */
     protected $pdo;
 
     /**
-     * The PDO table name used to store addressbooks
+     * The PDO table name used to store addressbooks.
      */
     public $addressBooksTableName = 'addressbooks';
 
     /**
-     * The PDO table name used to store cards
+     * The PDO table name used to store cards.
      */
     public $cardsTableName = 'cards';
 
@@ -41,48 +43,44 @@ class PDO extends AbstractBackend implements SyncSupport {
     public $addressBookChangesTableName = 'addressbookchanges';
 
     /**
-     * Sets up the object
+     * Sets up the object.
      *
      * @param \PDO $pdo
      */
-    function __construct(\PDO $pdo) {
-
+    public 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 ' . $this->addressBooksTableName . ' WHERE principaluri = ?');
+    public function getAddressBooksForUser($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',
+                '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.
      *
@@ -95,32 +93,29 @@ class PDO extends AbstractBackend implements SyncSupport {
      *
      * Read the PropPatch documentation for more info and examples.
      *
-     * @param string $addressBookId
+     * @param string               $addressBookId
      * @param \Sabre\DAV\PropPatch $propPatch
-     * @return void
      */
-    function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch) {
-
+    public function updateAddressBook($addressBookId, \Sabre\DAV\PropPatch $propPatch)
+    {
         $supportedProperties = [
             '{DAV:}displayname',
-            '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description',
+            '{'.CardDAV\Plugin::NS_CARDDAV.'}addressbook-description',
         ];
 
-        $propPatch->handle($supportedProperties, function($mutations) use ($addressBookId) {
-
+        $propPatch->handle($supportedProperties, function ($mutations) use ($addressBookId) {
             $updates = [];
             foreach ($mutations as $property => $newValue) {
-
                 switch ($property) {
-                    case '{DAV:}displayname' :
+                    case '{DAV:}displayname':
                         $updates['displayname'] = $newValue;
                         break;
-                    case '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description' :
+                    case '{'.CardDAV\Plugin::NS_CARDDAV.'}addressbook-description':
                         $updates['description'] = $newValue;
                         break;
                 }
             }
-            $query = 'UPDATE ' . $this->addressBooksTableName . ' SET ';
+            $query = 'UPDATE '.$this->addressBooksTableName.' SET ';
             $first = true;
             foreach ($updates as $key => $value) {
                 if ($first) {
@@ -128,7 +123,7 @@ class PDO extends AbstractBackend implements SyncSupport {
                 } else {
                     $query .= ', ';
                 }
-                $query .= ' ' . $key . ' = :' . $key . ' ';
+                $query .= ' '.$key.' = :'.$key.' ';
             }
             $query .= ' WHERE id = :addressbookid';
 
@@ -137,72 +132,67 @@ class PDO extends AbstractBackend implements SyncSupport {
 
             $stmt->execute($updates);
 
-            $this->addChange($addressBookId, "", 2);
+            $this->addChange($addressBookId, '', 2);
 
             return true;
-
         });
-
     }
 
     /**
-     * Creates a new address book
+     * Creates a new address book.
      *
      * @param string $principalUri
-     * @param string $url Just the 'basename' of the url.
-     * @param array $properties
+     * @param string $url          just the 'basename' of the url
+     * @param array  $properties
+     *
      * @return int Last insert id
      */
-    function createAddressBook($principalUri, $url, array $properties) {
-
+    public function createAddressBook($principalUri, $url, array $properties)
+    {
         $values = [
-            'displayname'  => null,
-            'description'  => null,
+            'displayname' => null,
+            'description' => null,
             'principaluri' => $principalUri,
-            'uri'          => $url,
+            'uri' => $url,
         ];
 
         foreach ($properties as $property => $newValue) {
-
             switch ($property) {
-                case '{DAV:}displayname' :
+                case '{DAV:}displayname':
                     $values['displayname'] = $newValue;
                     break;
-                case '{' . CardDAV\Plugin::NS_CARDDAV . '}addressbook-description' :
+                case '{'.CardDAV\Plugin::NS_CARDDAV.'}addressbook-description':
                     $values['description'] = $newValue;
                     break;
-                default :
-                    throw new DAV\Exception\BadRequest('Unknown property: ' . $property);
+                default:
+                    throw new DAV\Exception\BadRequest('Unknown property: '.$property);
             }
-
         }
 
-        $query = 'INSERT INTO ' . $this->addressBooksTableName . ' (uri, displayname, description, principaluri, synctoken) VALUES (:uri, :displayname, :description, :principaluri, 1)';
+        $query = 'INSERT INTO '.$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(
-            $this->addressBooksTableName . '_id_seq'
+            $this->addressBooksTableName.'_id_seq'
         );
-
     }
 
     /**
-     * Deletes an entire addressbook and all its contents
+     * Deletes an entire addressbook and all its contents.
      *
      * @param int $addressBookId
-     * @return void
      */
-    function deleteAddressBook($addressBookId) {
-
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->cardsTableName . ' WHERE addressbookid = ?');
+    public function deleteAddressBook($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 = $this->pdo->prepare('DELETE FROM '.$this->addressBooksTableName.' WHERE id = ?');
         $stmt->execute([$addressBookId]);
 
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->addressBookChangesTableName . ' WHERE addressbookid = ?');
+        $stmt = $this->pdo->prepare('DELETE FROM '.$this->addressBookChangesTableName.' WHERE addressbookid = ?');
         $stmt->execute([$addressBookId]);
-
     }
 
     /**
@@ -222,21 +212,22 @@ class PDO extends AbstractBackend implements SyncSupport {
      * 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 ' . $this->cardsTableName . ' WHERE addressbookid = ?');
+    public function getCards($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'] . '"';
-            $row['lastmodified'] = (int)$row['lastmodified'];
+            $row['etag'] = '"'.$row['etag'].'"';
+            $row['lastmodified'] = (int) $row['lastmodified'];
             $result[] = $row;
         }
-        return $result;
 
+        return $result;
     }
 
     /**
@@ -247,23 +238,26 @@ class PDO extends AbstractBackend implements SyncSupport {
      *
      * If the card does not exist, you must return false.
      *
-     * @param mixed $addressBookId
+     * @param mixed  $addressBookId
      * @param string $cardUri
+     *
      * @return array
      */
-    function getCard($addressBookId, $cardUri) {
-
-        $stmt = $this->pdo->prepare('SELECT id, carddata, uri, lastmodified, etag, size FROM ' . $this->cardsTableName . ' WHERE addressbookid = ? AND uri = ? LIMIT 1');
+    public function getCard($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 (!$result) return false;
+        if (!$result) {
+            return false;
+        }
+
+        $result['etag'] = '"'.$result['etag'].'"';
+        $result['lastmodified'] = (int) $result['lastmodified'];
 
-        $result['etag'] = '"' . $result['etag'] . '"';
-        $result['lastmodified'] = (int)$result['lastmodified'];
         return $result;
-
     }
 
     /**
@@ -276,11 +270,12 @@ class PDO extends AbstractBackend implements SyncSupport {
      *
      * @param mixed $addressBookId
      * @param array $uris
+     *
      * @return array
      */
-    function getMultipleCards($addressBookId, array $uris) {
-
-        $query = 'SELECT id, uri, lastmodified, etag, size, carddata FROM ' . $this->cardsTableName . ' WHERE addressbookid = ? AND uri IN (';
+    public function getMultipleCards($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 .= ')';
@@ -289,12 +284,12 @@ class PDO extends AbstractBackend implements SyncSupport {
         $stmt->execute(array_merge([$addressBookId], $uris));
         $result = [];
         while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-            $row['etag'] = '"' . $row['etag'] . '"';
-            $row['lastmodified'] = (int)$row['lastmodified'];
+            $row['etag'] = '"'.$row['etag'].'"';
+            $row['lastmodified'] = (int) $row['lastmodified'];
             $result[] = $row;
         }
-        return $result;
 
+        return $result;
     }
 
     /**
@@ -317,14 +312,15 @@ class PDO extends AbstractBackend implements SyncSupport {
      *
      * If you don't return an ETag, you can just return null.
      *
-     * @param mixed $addressBookId
+     * @param mixed  $addressBookId
      * @param string $cardUri
      * @param string $cardData
+     *
      * @return string|null
      */
-    function createCard($addressBookId, $cardUri, $cardData) {
-
-        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->cardsTableName . ' (carddata, uri, lastmodified, addressbookid, size, etag) VALUES (?, ?, ?, ?, ?, ?)');
+    public function createCard($addressBookId, $cardUri, $cardData)
+    {
+        $stmt = $this->pdo->prepare('INSERT INTO '.$this->cardsTableName.' (carddata, uri, lastmodified, addressbookid, size, etag) VALUES (?, ?, ?, ?, ?, ?)');
 
         $etag = md5($cardData);
 
@@ -339,8 +335,7 @@ class PDO extends AbstractBackend implements SyncSupport {
 
         $this->addChange($addressBookId, $cardUri, 1);
 
-        return '"' . $etag . '"';
-
+        return '"'.$etag.'"';
     }
 
     /**
@@ -363,14 +358,15 @@ class PDO extends AbstractBackend implements SyncSupport {
      *
      * If you don't return an ETag, you can just return null.
      *
-     * @param mixed $addressBookId
+     * @param mixed  $addressBookId
      * @param string $cardUri
      * @param string $cardData
+     *
      * @return string|null
      */
-    function updateCard($addressBookId, $cardUri, $cardData) {
-
-        $stmt = $this->pdo->prepare('UPDATE ' . $this->cardsTableName . ' SET carddata = ?, lastmodified = ?, size = ?, etag = ? WHERE uri = ? AND addressbookid =?');
+    public function updateCard($addressBookId, $cardUri, $cardData)
+    {
+        $stmt = $this->pdo->prepare('UPDATE '.$this->cardsTableName.' SET carddata = ?, lastmodified = ?, size = ?, etag = ? WHERE uri = ? AND addressbookid =?');
 
         $etag = md5($cardData);
         $stmt->execute([
@@ -379,31 +375,30 @@ class PDO extends AbstractBackend implements SyncSupport {
             strlen($cardData),
             $etag,
             $cardUri,
-            $addressBookId
+            $addressBookId,
         ]);
 
         $this->addChange($addressBookId, $cardUri, 2);
 
-        return '"' . $etag . '"';
-
+        return '"'.$etag.'"';
     }
 
     /**
-     * Deletes a card
+     * Deletes a card.
      *
-     * @param mixed $addressBookId
+     * @param mixed  $addressBookId
      * @param string $cardUri
+     *
      * @return bool
      */
-    function deleteCard($addressBookId, $cardUri) {
-
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->cardsTableName . ' WHERE addressbookid = ? AND uri = ?');
+    public function deleteCard($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;
-
+        return 1 === $stmt->rowCount();
     }
 
     /**
@@ -458,30 +453,34 @@ class PDO extends AbstractBackend implements SyncSupport {
      *
      * @param string $addressBookId
      * @param string $syncToken
-     * @param int $syncLevel
-     * @param int $limit
+     * @param int    $syncLevel
+     * @param int    $limit
+     *
      * @return array
      */
-    function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null) {
-
+    public function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null)
+    {
         // Current synctoken
-        $stmt = $this->pdo->prepare('SELECT synctoken FROM ' . $this->addressBooksTableName . ' WHERE id = ?');
+        $stmt = $this->pdo->prepare('SELECT synctoken FROM '.$this->addressBooksTableName.' WHERE id = ?');
         $stmt->execute([$addressBookId]);
         $currentToken = $stmt->fetchColumn(0);
 
-        if (is_null($currentToken)) return null;
+        if (is_null($currentToken)) {
+            return null;
+        }
 
         $result = [
             'syncToken' => $currentToken,
-            'added'     => [],
-            'modified'  => [],
-            'deleted'   => [],
+            '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;
+            $query = 'SELECT uri, operation FROM '.$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);
@@ -492,13 +491,10 @@ class PDO extends AbstractBackend implements SyncSupport {
             // 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;
@@ -510,41 +506,38 @@ class PDO extends AbstractBackend implements SyncSupport {
                         $result['deleted'][] = $uri;
                         break;
                 }
-
             }
         } else {
             // No synctoken supplied, this is the initial sync.
-            $query = "SELECT uri FROM " . $this->cardsTableName . " WHERE addressbookid = ?";
+            $query = 'SELECT uri FROM '.$this->cardsTableName.' WHERE addressbookid = ?';
             $stmt = $this->pdo->prepare($query);
             $stmt->execute([$addressBookId]);
 
             $result['added'] = $stmt->fetchAll(\PDO::FETCH_COLUMN);
         }
-        return $result;
 
+        return $result;
     }
 
     /**
      * Adds a change record to the addressbookchanges table.
      *
-     * @param mixed $addressBookId
+     * @param mixed  $addressBookId
      * @param string $objectUri
-     * @param int $operation 1 = add, 2 = modify, 3 = delete
-     * @return void
+     * @param int    $operation     1 = add, 2 = modify, 3 = delete
      */
-    protected function addChange($addressBookId, $objectUri, $operation) {
-
-        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->addressBookChangesTableName . ' (uri, synctoken, addressbookid, operation) SELECT ?, synctoken, ?, ? FROM ' . $this->addressBooksTableName . ' WHERE id = ?');
+    protected function addChange($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
+            $addressBookId,
         ]);
-        $stmt = $this->pdo->prepare('UPDATE ' . $this->addressBooksTableName . ' SET synctoken = synctoken + 1 WHERE id = ?');
+        $stmt = $this->pdo->prepare('UPDATE '.$this->addressBooksTableName.' SET synctoken = synctoken + 1 WHERE id = ?');
         $stmt->execute([
-            $addressBookId
+            $addressBookId,
         ]);
-
     }
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php b/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php
index f80618a8e..071361ed0 100644
--- a/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php
+++ b/vendor/sabre/dav/lib/CardDAV/Backend/SyncSupport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Backend;
 
 /**
@@ -18,8 +20,8 @@ namespace Sabre\CardDAV\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface SyncSupport extends BackendInterface {
-
+interface SyncSupport extends BackendInterface
+{
     /**
      * The getChanges method returns all the changes that have happened, since
      * the specified syncToken in the specified address book.
@@ -72,10 +74,10 @@ interface SyncSupport extends BackendInterface {
      *
      * @param string $addressBookId
      * @param string $syncToken
-     * @param int $syncLevel
-     * @param int $limit
+     * @param int    $syncLevel
+     * @param int    $limit
+     *
      * @return array
      */
-    function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null);
-
+    public function getChangesForAddressBook($addressBookId, $syncToken, $syncLevel, $limit = null);
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Card.php b/vendor/sabre/dav/lib/CardDAV/Card.php
index 42a2d7b6a..1d544f4aa 100644
--- a/vendor/sabre/dav/lib/CardDAV/Card.php
+++ b/vendor/sabre/dav/lib/CardDAV/Card.php
@@ -1,94 +1,96 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV;
 
 use Sabre\DAV;
 use Sabre\DAVACL;
 
 /**
- * The Card object represents a single Card from an addressbook
+ * The Card object represents a single Card from an addressbook.
  *
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Card extends DAV\File implements ICard, DAVACL\IACL {
-
+class Card extends DAV\File implements ICard, DAVACL\IACL
+{
     use DAVACL\ACLTrait;
 
     /**
-     * CardDAV backend
+     * CardDAV backend.
      *
      * @var Backend\BackendInterface
      */
     protected $carddavBackend;
 
     /**
-     * Array with information about this Card
+     * Array with information about this Card.
      *
      * @var array
      */
     protected $cardData;
 
     /**
-     * Array with information about the containing addressbook
+     * Array with information about the containing addressbook.
      *
      * @var array
      */
     protected $addressBookInfo;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param Backend\BackendInterface $carddavBackend
-     * @param array $addressBookInfo
-     * @param array $cardData
+     * @param array                    $addressBookInfo
+     * @param array                    $cardData
      */
-    function __construct(Backend\BackendInterface $carddavBackend, array $addressBookInfo, array $cardData) {
-
+    public function __construct(Backend\BackendInterface $carddavBackend, array $addressBookInfo, array $cardData)
+    {
         $this->carddavBackend = $carddavBackend;
         $this->addressBookInfo = $addressBookInfo;
         $this->cardData = $cardData;
-
     }
 
     /**
-     * Returns the uri for this object
+     * Returns the uri for this object.
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return $this->cardData['uri'];
-
     }
 
     /**
-     * Returns the VCard-formatted object
+     * Returns the VCard-formatted object.
      *
      * @return string
      */
-    function get() {
-
+    public function get()
+    {
         // Pre-populating 'carddata' is optional. If we don't yet have it
         // already, we fetch it from the backend.
         if (!isset($this->cardData['carddata'])) {
             $this->cardData = $this->carddavBackend->getCard($this->addressBookInfo['id'], $this->cardData['uri']);
         }
-        return $this->cardData['carddata'];
 
+        return $this->cardData['carddata'];
     }
 
     /**
-     * Updates the VCard-formatted object
+     * Updates the VCard-formatted object.
      *
      * @param string $cardData
+     *
      * @return string|null
      */
-    function put($cardData) {
-
-        if (is_resource($cardData))
+    public function put($cardData)
+    {
+        if (is_resource($cardData)) {
             $cardData = stream_get_contents($cardData);
+        }
 
         // Converting to UTF-8, if needed
         $cardData = DAV\StringUtil::ensureUTF8($cardData);
@@ -98,92 +100,82 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
         $this->cardData['etag'] = $etag;
 
         return $etag;
-
     }
 
     /**
-     * Deletes the card
-     *
-     * @return void
+     * Deletes the card.
      */
-    function delete() {
-
+    public function delete()
+    {
         $this->carddavBackend->deleteCard($this->addressBookInfo['id'], $this->cardData['uri']);
-
     }
 
     /**
-     * Returns the mime content-type
+     * Returns the mime content-type.
      *
      * @return string
      */
-    function getContentType() {
-
+    public function getContentType()
+    {
         return 'text/vcard; charset=utf-8';
-
     }
 
     /**
-     * Returns an ETag for this object
+     * Returns an ETag for this object.
      *
      * @return string
      */
-    function getETag() {
-
+    public function getETag()
+    {
         if (isset($this->cardData['etag'])) {
             return $this->cardData['etag'];
         } else {
             $data = $this->get();
             if (is_string($data)) {
-                return '"' . md5($data) . '"';
+                return '"'.md5($data).'"';
             } else {
                 // We refuse to calculate the md5 if it's a stream.
                 return null;
             }
         }
-
     }
 
     /**
-     * Returns the last modification date as a unix timestamp
+     * Returns the last modification date as a unix timestamp.
      *
      * @return int
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         return isset($this->cardData['lastmodified']) ? $this->cardData['lastmodified'] : null;
-
     }
 
     /**
-     * Returns the size of this object in bytes
+     * Returns the size of this object in bytes.
      *
      * @return int
      */
-    function getSize() {
-
+    public function getSize()
+    {
         if (array_key_exists('size', $this->cardData)) {
             return $this->cardData['size'];
         } else {
             return strlen($this->get());
         }
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->addressBookInfo['principaluri'];
-
     }
 
-
     /**
      * Returns a list of ACE's for this node.
      *
@@ -196,8 +188,8 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         // An alternative acl may be specified through the cardData array.
         if (isset($this->cardData['acl'])) {
             return $this->cardData['acl'];
@@ -210,7 +202,5 @@ class Card extends DAV\File implements ICard, DAVACL\IACL {
                 'protected' => true,
             ],
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/IAddressBook.php b/vendor/sabre/dav/lib/CardDAV/IAddressBook.php
index f80e05575..3f489f4e5 100644
--- a/vendor/sabre/dav/lib/CardDAV/IAddressBook.php
+++ b/vendor/sabre/dav/lib/CardDAV/IAddressBook.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV;
 
 use Sabre\DAV;
 
 /**
- * AddressBook interface
+ * AddressBook interface.
  *
  * Implement this interface to allow a node to be recognized as an addressbook.
  *
@@ -13,6 +15,6 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IAddressBook extends DAV\ICollection {
-
+interface IAddressBook extends DAV\ICollection
+{
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/ICard.php b/vendor/sabre/dav/lib/CardDAV/ICard.php
index a974cbd8f..30e9d415e 100644
--- a/vendor/sabre/dav/lib/CardDAV/ICard.php
+++ b/vendor/sabre/dav/lib/CardDAV/ICard.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV;
 
 use Sabre\DAV;
 
 /**
- * Card interface
+ * Card interface.
  *
  * Extend the ICard interface to allow your custom nodes to be picked up as
  * 'Cards'.
@@ -14,6 +16,6 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ICard extends DAV\IFile {
-
+interface ICard extends DAV\IFile
+{
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/IDirectory.php b/vendor/sabre/dav/lib/CardDAV/IDirectory.php
index d991a1cc8..05e6bef32 100644
--- a/vendor/sabre/dav/lib/CardDAV/IDirectory.php
+++ b/vendor/sabre/dav/lib/CardDAV/IDirectory.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV;
 
 /**
- * IDirectory interface
+ * IDirectory interface.
  *
  * Implement this interface to have an addressbook marked as a 'directory'. A
  * directory is an (often) global addressbook.
@@ -15,6 +17,6 @@ namespace Sabre\CardDAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IDirectory extends IAddressBook {
-
+interface IDirectory extends IAddressBook
+{
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Plugin.php b/vendor/sabre/dav/lib/CardDAV/Plugin.php
index 272ae71fa..10398a4d2 100644
--- a/vendor/sabre/dav/lib/CardDAV/Plugin.php
+++ b/vendor/sabre/dav/lib/CardDAV/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV;
 
 use Sabre\DAV;
@@ -9,10 +11,11 @@ use Sabre\DAVACL;
 use Sabre\HTTP;
 use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
+use Sabre\Uri;
 use Sabre\VObject;
 
 /**
- * CardDAV plugin
+ * CardDAV plugin.
  *
  * The CardDAV plugin adds CardDAV functionality to the WebDAV server
  *
@@ -20,15 +23,15 @@ use Sabre\VObject;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends DAV\ServerPlugin {
-
+class Plugin extends DAV\ServerPlugin
+{
     /**
-     * Url to the addressbooks
+     * Url to the addressbooks.
      */
     const ADDRESSBOOK_ROOT = 'addressbooks';
 
     /**
-     * xml namespace for CardDAV elements
+     * xml namespace for CardDAV elements.
      */
     const NS_CARDDAV = 'urn:ietf:params:xml:ns:carddav';
 
@@ -41,7 +44,7 @@ class Plugin extends DAV\ServerPlugin {
     public $directories = [];
 
     /**
-     * Server class
+     * Server class.
      *
      * @var DAV\Server
      */
@@ -55,41 +58,39 @@ class Plugin extends DAV\ServerPlugin {
     protected $maxResourceSize = 10000000;
 
     /**
-     * Initializes the plugin
+     * Initializes the plugin.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public 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']);
+        $server->on('propFind', [$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';
+        $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';
+        $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->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;
-
     }
 
     /**
@@ -99,10 +100,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return ['addressbook'];
-
     }
 
     /**
@@ -113,117 +113,111 @@ class Plugin extends DAV\ServerPlugin {
      * implement them
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getSupportedReportSet($uri) {
-
+    public 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',
+                 '{'.self::NS_CARDDAV.'}addressbook-multiget',
+                 '{'.self::NS_CARDDAV.'}addressbook-query',
             ];
         }
-        return [];
 
+        return [];
     }
 
-
     /**
-     * Adds all CardDAV-specific properties
+     * Adds all CardDAV-specific properties.
      *
      * @param DAV\PropFind $propFind
-     * @param DAV\INode $node
-     * @return void
+     * @param DAV\INode    $node
      */
-    function propFindEarly(DAV\PropFind $propFind, DAV\INode $node) {
-
-        $ns = '{' . self::NS_CARDDAV . '}';
+    public 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() {
+            $propFind->handle($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() {
+            $propFind->handle($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 LocalHref($this->getAddressBookHomeForPrincipal($path) . '/');
-            });
-
-            if ($this->directories) $propFind->handle('{' . self::NS_CARDDAV . '}directory-gateway', function() {
-                return new LocalHref($this->directories);
+            $propFind->handle('{'.self::NS_CARDDAV.'}addressbook-home-set', function () use ($path) {
+                return new LocalHref($this->getAddressBookHomeForPrincipal($path).'/');
             });
 
+            if ($this->directories) {
+                $propFind->handle('{'.self::NS_CARDDAV.'}directory-gateway', function () {
+                    return new LocalHref($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) {
+            $propFind->handle('{'.self::NS_CARDDAV.'}address-data', function () use ($node) {
                 $val = $node->get();
-                if (is_resource($val))
+                if (is_resource($val)) {
                     $val = stream_get_contents($val);
+                }
 
                 return $val;
-
             });
-
         }
-
     }
 
     /**
-     * This functions handles REPORT requests specific to CardDAV
+     * This functions handles REPORT requests specific to CardDAV.
      *
-     * @param string $reportName
+     * @param string   $reportName
      * @param \DOMNode $dom
-     * @param mixed $path
+     * @param mixed    $path
+     *
      * @return bool
      */
-    function report($reportName, $dom, $path) {
-
+    public function report($reportName, $dom, $path)
+    {
         switch ($reportName) {
-            case '{' . self::NS_CARDDAV . '}addressbook-multiget' :
+            case '{'.self::NS_CARDDAV.'}addressbook-multiget':
                 $this->server->transactionType = 'report-addressbook-multiget';
                 $this->addressbookMultiGetReport($dom);
+
                 return false;
-            case '{' . self::NS_CARDDAV . '}addressbook-query' :
+            case '{'.self::NS_CARDDAV.'}addressbook-query':
                 $this->server->transactionType = 'report-addressbook-query';
                 $this->addressBookQueryReport($dom);
+
                 return false;
-            default :
+            default:
                 return;
-
         }
-
-
     }
 
     /**
-     * Returns the addressbook home for a given principal
+     * 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 . '/' . $principalId;
+    protected function getAddressbookHomeForPrincipal($principal)
+    {
+        list(, $principalId) = Uri\split($principal);
 
+        return self::ADDRESSBOOK_ROOT.'/'.$principalId;
     }
 
-
     /**
      * This function handles the addressbook-multiget REPORT.
      *
@@ -231,14 +225,13 @@ class Plugin extends DAV\ServerPlugin {
      * of urls. Effectively avoiding a lot of redundant requests.
      *
      * @param Xml\Request\AddressBookMultiGetReport $report
-     * @return void
      */
-    function addressbookMultiGetReport($report) {
-
+    public function addressbookMultiGetReport($report)
+    {
         $contentType = $report->contentType;
         $version = $report->version;
         if ($version) {
-            $contentType .= '; version=' . $version;
+            $contentType .= '; version='.$version;
         }
 
         $vcardType = $this->negotiateVCard(
@@ -251,17 +244,13 @@ class Plugin extends DAV\ServerPlugin {
             $report->hrefs
         );
         foreach ($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(
-                    $props[200]['{' . self::NS_CARDDAV . '}address-data'],
+            if (isset($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();
@@ -269,8 +258,7 @@ class Plugin extends DAV\ServerPlugin {
         $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'));
-
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($propertyList, 'minimal' === $prefer['return']));
     }
 
     /**
@@ -279,20 +267,19 @@ class Plugin extends DAV\ServerPlugin {
      * This plugin uses this method to ensure that Card nodes receive valid
      * vcard data.
      *
-     * @param string $path
+     * @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
+     * @param resource  $data
+     * @param bool      $modified should be set to true, if this event handler
+     *                            changed &$data
      */
-    function beforeWriteContent($path, DAV\IFile $node, &$data, &$modified) {
-
-        if (!$node instanceof ICard)
+    public function beforeWriteContent($path, DAV\IFile $node, &$data, &$modified)
+    {
+        if (!$node instanceof ICard) {
             return;
+        }
 
         $this->validateVCard($data, $modified);
-
     }
 
     /**
@@ -301,20 +288,19 @@ class Plugin extends DAV\ServerPlugin {
      * This plugin uses this method to ensure that Card nodes receive valid
      * vcard data.
      *
-     * @param string $path
-     * @param resource $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
+     * @param bool            $modified   should be set to true, if this event handler
+     *                                    changed &$data
      */
-    function beforeCreateFile($path, &$data, DAV\ICollection $parentNode, &$modified) {
-
-        if (!$parentNode instanceof IAddressBook)
+    public function beforeCreateFile($path, &$data, DAV\ICollection $parentNode, &$modified)
+    {
+        if (!$parentNode instanceof IAddressBook) {
             return;
+        }
 
         $this->validateVCard($data, $modified);
-
     }
 
     /**
@@ -323,12 +309,11 @@ class Plugin extends DAV\ServerPlugin {
      * 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
+     * @param bool            $modified should be set to true, if this event handler
+     *                                  changed &$data
      */
-    protected function validateVCard(&$data, &$modified) {
-
+    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);
@@ -337,10 +322,9 @@ class Plugin extends DAV\ServerPlugin {
         $before = $data;
 
         try {
-
             // If the data starts with a [, we can reasonably assume we're dealing
             // with a jCal object.
-            if (substr($data, 0, 1) === '[') {
+            if ('[' === substr($data, 0, 1)) {
                 $vobj = VObject\Reader::readJson($data);
 
                 // Converting $data back to iCalendar, as that's what we
@@ -350,21 +334,18 @@ class Plugin extends DAV\ServerPlugin {
             } 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: ' . $e->getMessage());
-
+            throw new DAV\Exception\UnsupportedMediaType('This resource only supports valid vCard or jCard data. Parse error: '.$e->getMessage());
         }
 
-        if ($vobj->name !== 'VCARD') {
+        if ('VCARD' !== $vobj->name) {
             throw new DAV\Exception\UnsupportedMediaType('This collection can only support vcard objects.');
         }
 
         $options = VObject\Node::PROFILE_CARDDAV;
         $prefer = $this->server->getHTTPPrefer();
 
-        if ($prefer['handling'] !== 'strict') {
+        if ('strict' !== $prefer['handling']) {
             $options |= VObject\Node::REPAIR;
         }
 
@@ -376,7 +357,6 @@ class Plugin extends DAV\ServerPlugin {
         // $messages contains a list of problems with the vcard, along with
         // their severity.
         foreach ($messages as $message) {
-
             if ($message['level'] > $highestLevel) {
                 // Recording the highest reported error level.
                 $highestLevel = $message['level'];
@@ -384,30 +364,27 @@ class Plugin extends DAV\ServerPlugin {
             }
 
             switch ($message['level']) {
-
-                case 1 :
+                case 1:
                     // Level 1 means that there was a problem, but it was repaired.
                     $modified = true;
                     break;
-                case 2 :
+                case 2:
                     // Level 2 means a warning, but not critical
                     break;
-                case 3 :
+                case 3:
                     // Level 3 means a critical error
-                    throw new DAV\Exception\UnsupportedMediaType('Validation error in vCard: ' . $message['message']);
-
+                    throw new DAV\Exception\UnsupportedMediaType('Validation error in vCard: '.$message['message']);
             }
-
         }
         if ($warningMessage) {
             $this->server->httpResponse->setHeader(
                 'X-Sabre-Ew-Gross',
-                'vCard validation warning: ' . $warningMessage
+                'vCard validation warning: '.$warningMessage
             );
 
             // Re-serializing object.
             $data = $vobj->serialize();
-            if (!$modified && strcmp($data, $before) !== 0) {
+            if (!$modified && 0 !== strcmp($data, $before)) {
                 // This ensures that the system does not send an ETag back.
                 $modified = true;
             }
@@ -417,23 +394,21 @@ class Plugin extends DAV\ServerPlugin {
         $vobj->destroy();
     }
 
-
     /**
-     * This function handles the addressbook-query REPORT
+     * 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) {
-
+    protected function addressbookQueryReport($report)
+    {
         $depth = $this->server->getHTTPDepth(0);
 
-        if ($depth == 0) {
+        if (0 == $depth) {
             $candidateNodes = [
-                $this->server->tree->getNodeForPath($this->server->getRequestUri())
+                $this->server->tree->getNodeForPath($this->server->getRequestUri()),
             ];
             if (!$candidateNodes[0] instanceof ICard) {
                 throw new ReportNotSupported('The addressbook-query report is not supported on this url with Depth: 0');
@@ -444,7 +419,7 @@ class Plugin extends DAV\ServerPlugin {
 
         $contentType = $report->contentType;
         if ($report->version) {
-            $contentType .= '; version=' . $report->version;
+            $contentType .= '; version='.$report->version;
         }
 
         $vcardType = $this->negotiateVCard(
@@ -453,9 +428,9 @@ class Plugin extends DAV\ServerPlugin {
 
         $validNodes = [];
         foreach ($candidateNodes as $node) {
-
-            if (!$node instanceof ICard)
+            if (!$node instanceof ICard) {
                 continue;
+            }
 
             $blob = $node->get();
             if (is_resource($blob)) {
@@ -472,31 +447,26 @@ class Plugin extends DAV\ServerPlugin {
                 // We hit the maximum number of items, we can stop now.
                 break;
             }
-
         }
 
         $result = [];
         foreach ($validNodes as $validNode) {
-
-            if ($depth == 0) {
+            if (0 == $depth) {
                 $href = $this->server->getRequestUri();
             } else {
-                $href = $this->server->getRequestUri() . '/' . $validNode->getName();
+                $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(
-                    $props[200]['{' . self::NS_CARDDAV . '}address-data'],
+            if (isset($props[200]['{'.self::NS_CARDDAV.'}address-data'])) {
+                $props[200]['{'.self::NS_CARDDAV.'}address-data'] = $this->convertVCard(
+                    $props[200]['{'.self::NS_CARDDAV.'}address-data'],
                     $vcardType,
                     $report->addressDataProperties
                 );
-
             }
             $result[] = $props;
-
         }
 
         $prefer = $this->server->getHTTPPrefer();
@@ -504,26 +474,26 @@ class Plugin extends DAV\ServerPlugin {
         $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'));
-
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($result, 'minimal' === $prefer['return']));
     }
 
     /**
      * 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)
+     * @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;
+    public 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) {
@@ -532,12 +502,9 @@ class Plugin extends DAV\ServerPlugin {
                     $success = true;
                 }
             } elseif ((!$filter['param-filters'] && !$filter['text-matches']) || !$isDefined) {
-
                 // We only need to check for existence
                 $success = $isDefined;
-
             } else {
-
                 $vProperties = $vcard->select($filter['name']);
 
                 $results = [];
@@ -546,44 +513,40 @@ class Plugin extends DAV\ServerPlugin {
                 }
                 if ($filter['text-matches']) {
                     $texts = [];
-                    foreach ($vProperties as $vProperty)
+                    foreach ($vProperties as $vProperty) {
                         $texts[] = $vProperty->getValue();
+                    }
 
                     $results[] = $this->validateTextMatches($texts, $filter['text-matches'], $filter['test']);
                 }
 
-                if (count($results) === 1) {
+                if (1 === count($results)) {
                     $success = $results[0];
                 } else {
-                    if ($filter['test'] === 'anyof') {
+                    if ('anyof' === $filter['test']) {
                         $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) {
-
+            if ('anyof' === $test && $success) {
                 // Destroy circular references to PHP will GC the object.
                 $vcard->destroy();
 
                 return true;
             }
-            if ($test === 'allof' && !$success) {
-
+            if ('allof' === $test && !$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();
 
@@ -592,8 +555,7 @@ class Plugin extends DAV\ServerPlugin {
         //
         // This implies for 'anyof' that the test failed, and for 'allof' that
         // we succeeded. Sounds weird, but makes sense.
-        return $test === 'allof';
-
+        return 'allof' === $test;
     }
 
     /**
@@ -602,19 +564,22 @@ class Plugin extends DAV\ServerPlugin {
      * @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 array  $vProperties
+     * @param array  $filters
      * @param string $test
+     *
      * @return bool
      */
-    protected function validateParamFilters(array $vProperties, array $filters, $test) {
-
+    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 ($isDefined) {
+                    break;
+                }
             }
 
             if ($filter['is-not-defined']) {
@@ -624,35 +589,32 @@ class Plugin extends DAV\ServerPlugin {
                     $success = true;
                 }
 
-            // If there's no text-match, we can just check for existence
+                // 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 ($success) {
+                        break;
+                    }
                 }
                 if ($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) {
+            if ('anyof' === $test && $success) {
                 return true;
             }
-            if ($test === 'allof' && !$success) {
+            if ('allof' === $test && !$success) {
                 return false;
             }
-
         }
 
         // If we got all the way here, it means we haven't been able to
@@ -660,40 +622,41 @@ class Plugin extends DAV\ServerPlugin {
         //
         // This implies for 'anyof' that the test failed, and for 'allof' that
         // we succeeded. Sounds weird, but makes sense.
-        return $test === 'allof';
-
+        return 'allof' === $test;
     }
 
     /**
      * Validates if a text-filter can be applied to a specific property.
      *
-     * @param array $texts
-     * @param array $filters
+     * @param array  $texts
+     * @param array  $filters
      * @param string $test
+     *
      * @return bool
      */
-    protected function validateTextMatches(array $texts, array $filters, $test) {
-
+    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 ($success) break;
+                if ($success) {
+                    break;
+                }
             }
             if ($filter['negate-condition']) {
                 $success = !$success;
             }
 
-            if ($success && $test === 'anyof')
+            if ($success && 'anyof' === $test) {
                 return true;
+            }
 
-            if (!$success && $test == 'allof')
+            if (!$success && 'allof' == $test) {
                 return false;
-
-
+            }
         }
 
         // If we got all the way here, it means we haven't been able to
@@ -701,8 +664,7 @@ class Plugin extends DAV\ServerPlugin {
         //
         // This implies for 'anyof' that the test failed, and for 'allof' that
         // we succeeded. Sounds weird, but makes sense.
-        return $test === 'allof';
-
+        return 'allof' === $test;
     }
 
     /**
@@ -712,24 +674,24 @@ class Plugin extends DAV\ServerPlugin {
      * propfind has been done.
      *
      * @param DAV\PropFind $propFind
-     * @param DAV\INode $node
-     * @return void
+     * @param DAV\INode    $node
      */
-    function propFindLate(DAV\PropFind $propFind, DAV\INode $node) {
-
+    public 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) {
+        if (false === strpos((string) $this->server->httpRequest->getHeader('User-Agent'), 'Thunderbird')) {
             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');
+        if (null !== $contentType) {
+            list($part) = explode(';', $contentType);
+            if ('text/x-vcard' === $part || 'text/vcard' === $part) {
+                $propFind->set('{DAV:}getcontenttype', 'text/x-vcard');
+            }
         }
-
     }
 
     /**
@@ -738,18 +700,20 @@ class Plugin extends DAV\ServerPlugin {
      * can use to create new addressbooks.
      *
      * @param DAV\INode $node
-     * @param string $output
+     * @param string    $output
+     *
      * @return bool
      */
-    function htmlActionsPanel(DAV\INode $node, &$output) {
-
-        if (!$node instanceof AddressBookHome)
+    public 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" />
+            <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" />
@@ -757,7 +721,6 @@ class Plugin extends DAV\ServerPlugin {
             </td></tr>';
 
         return false;
-
     }
 
     /**
@@ -765,13 +728,13 @@ class Plugin extends DAV\ServerPlugin {
      *
      * This is used to transform data into jCal, if this was requested.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function httpAfterGet(RequestInterface $request, ResponseInterface $response) {
-
-        if (strpos($response->getHeader('Content-Type'), 'text/vcard') === false) {
+    public function httpAfterGet(RequestInterface $request, ResponseInterface $response)
+    {
+        $contentType = $response->getHeader('Content-Type');
+        if (null === $contentType || false === strpos($contentType, 'text/vcard')) {
             return;
         }
 
@@ -783,9 +746,8 @@ class Plugin extends DAV\ServerPlugin {
         );
 
         $response->setBody($newBody);
-        $response->setHeader('Content-Type', $mimeType . '; charset=utf-8');
+        $response->setHeader('Content-Type', $mimeType.'; charset=utf-8');
         $response->setHeader('Content-Length', strlen($newBody));
-
     }
 
     /**
@@ -800,11 +762,12 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @param string $input
      * @param string $mimeType
+     *
      * @return string
      */
-    protected function negotiateVCard($input, &$mimeType = null) {
-
-        $result = HTTP\Util::negotiate(
+    protected function negotiateVCard($input, &$mimeType = null)
+    {
+        $result = HTTP\negotiateContentType(
             $input,
             [
                 // Most often used mime-type. Version 3
@@ -823,41 +786,41 @@ class Plugin extends DAV\ServerPlugin {
 
         $mimeType = $result;
         switch ($result) {
-
-            default :
-            case 'text/x-vcard' :
-            case 'text/vcard' :
-            case 'text/vcard; version=3.0' :
+            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' :
+            case 'text/vcard; version=4.0':
                 return 'vcard4';
-            case 'application/vcard+json' :
+            case 'application/vcard+json':
                 return 'jcard';
 
         // @codeCoverageIgnoreStart
         }
         // @codeCoverageIgnoreEnd
-
     }
 
     /**
      * Converts a vcard blob to a different version, or jcard.
      *
      * @param string|resource $data
-     * @param string $target
-     * @param array $propertiesFilter
+     * @param string          $target
+     * @param array           $propertiesFilter
+     *
      * @return string
      */
-    protected function convertVCard($data, $target, array $propertiesFilter = null) {
-
+    protected function convertVCard($data, $target, array $propertiesFilter = null)
+    {
         if (is_resource($data)) {
             $data = stream_get_contents($data);
         }
         $input = VObject\Reader::read($data);
         if (!empty($propertiesFilter)) {
             $propertiesFilter = array_merge(['UID', 'VERSION', 'FN'], $propertiesFilter);
-            $keys = array_unique(array_map(function($child) {
+            $keys = array_unique(array_map(function ($child) {
                 return $child->name;
             }, $input->children()));
             $keys = array_diff($keys, $propertiesFilter);
@@ -868,38 +831,36 @@ class Plugin extends DAV\ServerPlugin {
         }
         $output = null;
         try {
-
             switch ($target) {
-                default :
-                case 'vcard3' :
-                    if ($input->getDocumentType() === VObject\Document::VCARD30) {
+                default:
+                case 'vcard3':
+                    if (VObject\Document::VCARD30 === $input->getDocumentType()) {
                         // Do nothing
                         return $data;
                     }
                     $output = $input->convert(VObject\Document::VCARD30);
+
                     return $output->serialize();
-                case 'vcard4' :
-                    if ($input->getDocumentType() === VObject\Document::VCARD40) {
+                case 'vcard4':
+                    if (VObject\Document::VCARD40 === $input->getDocumentType()) {
                         // Do nothing
                         return $data;
                     }
                     $output = $input->convert(VObject\Document::VCARD40);
+
                     return $output->serialize();
-                case 'jcard' :
+                case 'jcard':
                     $output = $input->convert(VObject\Document::VCARD40);
-                    return json_encode($output);
 
+                    return json_encode($output);
             }
-
         } finally {
-
             // Destroy circular references to PHP will GC the object.
             $input->destroy();
             if (!is_null($output)) {
                 $output->destroy();
             }
         }
-
     }
 
     /**
@@ -910,10 +871,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'carddav';
-
     }
 
     /**
@@ -927,14 +887,12 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Adds support for CardDAV (rfc6352)',
-            'link'        => 'http://sabre.io/dav/carddav/',
+            'link' => 'http://sabre.io/dav/carddav/',
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/VCFExportPlugin.php b/vendor/sabre/dav/lib/CardDAV/VCFExportPlugin.php
index 2d61db6ac..194927c53 100644
--- a/vendor/sabre/dav/lib/CardDAV/VCFExportPlugin.php
+++ b/vendor/sabre/dav/lib/CardDAV/VCFExportPlugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV;
 
 use Sabre\DAV;
@@ -8,7 +10,7 @@ use Sabre\HTTP\ResponseInterface;
 use Sabre\VObject;
 
 /**
- * VCF Exporter
+ * 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
@@ -19,28 +21,27 @@ use Sabre\VObject;
  * @author Thomas Tanghus (http://tanghus.net/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class VCFExportPlugin extends DAV\ServerPlugin {
-
+class VCFExportPlugin extends DAV\ServerPlugin
+{
     /**
-     * Reference to Server class
+     * Reference to Server class.
      *
      * @var DAV\Server
      */
     protected $server;
 
     /**
-     * Initializes the plugin and registers event handlers
+     * Initializes the plugin and registers event handlers.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public function initialize(DAV\Server $server)
+    {
         $this->server = $server;
         $this->server->on('method:GET', [$this, 'httpGet'], 90);
-        $server->on('browserButtonActions', function($path, $node, &$actions) {
+        $server->on('browserButtonActions', function ($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>';
+                $actions .= '<a href="'.htmlspecialchars($path, ENT_QUOTES, 'UTF-8').'?export"><span class="oi" data-glyph="book"></span></a>';
             }
         });
     }
@@ -48,20 +49,25 @@ class VCFExportPlugin extends DAV\ServerPlugin {
     /**
      * Intercepts GET requests on addressbook urls ending with ?export.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpGet(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpGet(RequestInterface $request, ResponseInterface $response)
+    {
         $queryParams = $request->getQueryParameters();
-        if (!array_key_exists('export', $queryParams)) return;
+        if (!array_key_exists('export', $queryParams)) {
+            return;
+        }
 
         $path = $request->getPath();
 
         $node = $this->server->tree->getNodeForPath($path);
 
-        if (!($node instanceof IAddressBook)) return;
+        if (!($node instanceof IAddressBook)) {
+            return;
+        }
 
         $this->server->transactionType = 'get-addressbook-export';
 
@@ -71,7 +77,7 @@ class VCFExportPlugin extends DAV\ServerPlugin {
         }
 
         $nodes = $this->server->getPropertiesForPath($path, [
-            '{' . Plugin::NS_CARDDAV . '}address-data',
+            '{'.Plugin::NS_CARDDAV.'}address-data',
         ], 1);
 
         $format = 'text/directory';
@@ -91,9 +97,9 @@ class VCFExportPlugin extends DAV\ServerPlugin {
             '',
             $node->getName()
         );
-        $filename .= '-' . date('Y-m-d') . $filenameExtension;
+        $filename .= '-'.date('Y-m-d').$filenameExtension;
 
-        $response->setHeader('Content-Disposition', 'attachment; filename="' . $filename . '"');
+        $response->setHeader('Content-Disposition', 'attachment; filename="'.$filename.'"');
         $response->setHeader('Content-Type', $format);
 
         $response->setStatus(200);
@@ -101,25 +107,24 @@ class VCFExportPlugin extends DAV\ServerPlugin {
 
         // Returning false to break the event chain
         return false;
-
     }
 
     /**
-     * Merges all vcard objects, and builds one big vcf export
+     * Merges all vcard objects, and builds one big vcf export.
      *
      * @param array $nodes
+     *
      * @return string
      */
-    function generateVCF(array $nodes) {
-
-        $output = "";
+    public function generateVCF(array $nodes)
+    {
+        $output = '';
 
         foreach ($nodes as $node) {
-
-            if (!isset($node[200]['{' . Plugin::NS_CARDDAV . '}address-data'])) {
+            if (!isset($node[200]['{'.Plugin::NS_CARDDAV.'}address-data'])) {
                 continue;
             }
-            $nodeData = $node[200]['{' . Plugin::NS_CARDDAV . '}address-data'];
+            $nodeData = $node[200]['{'.Plugin::NS_CARDDAV.'}address-data'];
 
             // Parsing this node so VObject can clean up the output.
             $vcard = VObject\Reader::read($nodeData);
@@ -127,11 +132,9 @@ class VCFExportPlugin extends DAV\ServerPlugin {
 
             // Destroy circular references to PHP will GC the object.
             $vcard->destroy();
-
         }
 
         return $output;
-
     }
 
     /**
@@ -142,10 +145,9 @@ class VCFExportPlugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'vcf-export';
-
     }
 
     /**
@@ -159,14 +161,12 @@ class VCFExportPlugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Adds the ability to export CardDAV addressbooks as a single vCard file.',
-            'link'        => 'http://sabre.io/dav/vcf-export-plugin/',
+            '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
index 5b7b2ee17..f1b651e76 100644
--- a/vendor/sabre/dav/lib/CardDAV/Xml/Filter/AddressData.php
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/AddressData.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Xml\Filter;
 
 use Sabre\Xml\Reader;
@@ -21,8 +23,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class AddressData implements XmlDeserializable {
-
+class AddressData implements XmlDeserializable
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -42,25 +44,25 @@ class AddressData implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $result = [
             'contentType' => $reader->getAttribute('content-type') ?: 'text/vcard',
-            'version'     => $reader->getAttribute('version') ?: '3.0',
+            'version' => $reader->getAttribute('version') ?: '3.0',
         ];
 
-        $elems = (array)$reader->parseInnerTree();
-        $elems = array_filter($elems, function($element) {
-            return $element['name'] === '{urn:ietf:params:xml:ns:carddav}prop' &&
+        $elems = (array) $reader->parseInnerTree();
+        $elems = array_filter($elems, function ($element) {
+            return '{urn:ietf:params:xml:ns:carddav}prop' === $element['name'] &&
                 isset($element['attributes']['name']);
         });
-        $result['addressDataProperties'] = array_map(function($element) {
+        $result['addressDataProperties'] = array_map(function ($element) {
             return $element['attributes']['name'];
         }, $elems);
 
         return $result;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Xml/Filter/ParamFilter.php b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/ParamFilter.php
index 936e26917..2d39dea7f 100644
--- a/vendor/sabre/dav/lib/CardDAV/Xml/Filter/ParamFilter.php
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/ParamFilter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Xml\Filter;
 
 use Sabre\CardDAV\Plugin;
@@ -21,8 +23,8 @@ use Sabre\Xml\Reader;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class ParamFilter implements Element {
-
+abstract class ParamFilter implements Element
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -42,14 +44,15 @@ abstract class ParamFilter implements Element {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $result = [
-            'name'           => null,
+            'name' => null,
             'is-not-defined' => false,
-            'text-match'     => null,
+            'text-match' => null,
         ];
 
         $att = $reader->parseAttributes();
@@ -57,33 +60,29 @@ abstract class ParamFilter implements Element {
 
         $elems = $reader->parseInnerTree();
 
-        if (is_array($elems)) foreach ($elems as $elem) {
-
-            switch ($elem['name']) {
-
-                case '{' . Plugin::NS_CARDDAV . '}is-not-defined' :
+        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' :
+                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: ' . $matchType);
+                        throw new BadRequest('Unknown match-type: '.$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'       => $matchType,
+                        'negate-condition' => isset($elem['attributes']['negate-condition']) && 'yes' === $elem['attributes']['negate-condition'],
+                        'collation' => isset($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
index d7799429d..a22a577c9 100644
--- a/vendor/sabre/dav/lib/CardDAV/Xml/Filter/PropFilter.php
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Filter/PropFilter.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Xml\Filter;
 
 use Sabre\CardDAV\Plugin;
@@ -21,8 +23,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PropFilter implements XmlDeserializable {
-
+class PropFilter implements XmlDeserializable
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -42,57 +44,54 @@ class PropFilter implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $result = [
-            'name'           => null,
-            'test'           => 'anyof',
+            'name' => null,
+            'test' => 'anyof',
             'is-not-defined' => false,
-            'param-filters'  => [],
-            'text-matches'   => [],
+            'param-filters' => [],
+            'text-matches' => [],
         ];
 
         $att = $reader->parseAttributes();
         $result['name'] = $att['name'];
 
-        if (isset($att['test']) && $att['test'] === 'allof') {
+        if (isset($att['test']) && 'allof' === $att['test']) {
             $result['test'] = 'allof';
         }
 
         $elems = $reader->parseInnerTree();
 
-        if (is_array($elems)) foreach ($elems as $elem) {
-
-            switch ($elem['name']) {
-
-                case '{' . Plugin::NS_CARDDAV . '}param-filter' :
+        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' :
+                case '{'.Plugin::NS_CARDDAV.'}is-not-defined':
                     $result['is-not-defined'] = true;
                     break;
-                case '{' . Plugin::NS_CARDDAV . '}text-match' :
+                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: ' . $matchType);
+                        throw new BadRequest('Unknown match-type: '.$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'       => $matchType,
+                        'negate-condition' => isset($elem['attributes']['negate-condition']) && 'yes' === $elem['attributes']['negate-condition'],
+                        'collation' => isset($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
index aecd8a09f..9d0051698 100644
--- a/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedAddressData.php
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedAddressData.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Xml\Property;
 
 use Sabre\CardDAV\Plugin;
@@ -7,7 +9,7 @@ use Sabre\Xml\Writer;
 use Sabre\Xml\XmlSerializable;
 
 /**
- * Supported-address-data property
+ * Supported-address-data property.
  *
  * This property is a representation of the supported-address-data property
  * in the CardDAV namespace.
@@ -20,22 +22,22 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SupportedAddressData implements XmlSerializable {
-
+class SupportedAddressData implements XmlSerializable
+{
     /**
-     * supported versions
+     * supported versions.
      *
      * @var array
      */
     protected $supportedData = [];
 
     /**
-     * Creates the property
+     * Creates the property.
      *
      * @param array|null $supportedData
      */
-    function __construct(array $supportedData = null) {
-
+    public function __construct(array $supportedData = null)
+    {
         if (is_null($supportedData)) {
             $supportedData = [
                 ['contentType' => 'text/vcard', 'version' => '3.0'],
@@ -45,7 +47,6 @@ class SupportedAddressData implements XmlSerializable {
         }
 
         $this->supportedData = $supportedData;
-
     }
 
     /**
@@ -65,19 +66,16 @@ class SupportedAddressData implements XmlSerializable {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->supportedData as $supported) {
-            $writer->startElement('{' . Plugin::NS_CARDDAV . '}address-data-type');
+            $writer->startElement('{'.Plugin::NS_CARDDAV.'}address-data-type');
             $writer->writeAttributes([
                 'content-type' => $supported['contentType'],
-                'version'      => $supported['version']
+                '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
index 778aa2b64..66e451a91 100644
--- a/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedCollationSet.php
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Property/SupportedCollationSet.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Xml\Property;
 
 use Sabre\Xml\Writer;
 use Sabre\Xml\XmlSerializable;
 
 /**
- * supported-collation-set property
+ * supported-collation-set property.
  *
  * This property is a representation of the supported-collation-set property
  * in the CardDAV namespace.
@@ -15,8 +17,8 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SupportedCollationSet implements XmlSerializable {
-
+class SupportedCollationSet implements XmlSerializable
+{
     /**
      * The xmlSerialize method is called during xml writing.
      *
@@ -34,14 +36,11 @@ class SupportedCollationSet implements XmlSerializable {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public 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
index 0115a0107..845796760 100644
--- a/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookMultiGetReport.php
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookMultiGetReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Xml\Request;
 
 use Sabre\CardDAV\Plugin;
@@ -19,8 +21,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class AddressBookMultiGetReport implements XmlDeserializable {
-
+class AddressBookMultiGetReport implements XmlDeserializable
+{
     /**
      * An array with requested properties.
      *
@@ -70,44 +72,40 @@ class AddressBookMultiGetReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public 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',
+            '{DAV:}prop' => 'Sabre\\Xml\\Element\\KeyValue',
         ]);
 
         $newProps = [
-            'hrefs'      => [],
-            'properties' => []
+            'hrefs' => [],
+            'properties' => [],
         ];
 
         foreach ($elems as $elem) {
-
             switch ($elem['name']) {
-
-                case '{DAV:}prop' :
+                case '{DAV:}prop':
                     $newProps['properties'] = array_keys($elem['value']);
-                    if (isset($elem['value']['{' . Plugin::NS_CARDDAV . '}address-data'])) {
-                        $newProps += $elem['value']['{' . Plugin::NS_CARDDAV . '}address-data'];
+                    if (isset($elem['value']['{'.Plugin::NS_CARDDAV.'}address-data'])) {
+                        $newProps += $elem['value']['{'.Plugin::NS_CARDDAV.'}address-data'];
                     }
                     break;
-                case '{DAV:}href' :
+                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;
 
+        return $obj;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookQueryReport.php b/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookQueryReport.php
index 09fad008a..0e6f26d38 100644
--- a/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookQueryReport.php
+++ b/vendor/sabre/dav/lib/CardDAV/Xml/Request/AddressBookQueryReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\CardDAV\Xml\Request;
 
 use Sabre\CardDAV\Plugin;
@@ -19,8 +21,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class AddressBookQueryReport implements XmlDeserializable {
-
+class AddressBookQueryReport implements XmlDeserializable
+{
     /**
      * An array with requested properties.
      *
@@ -64,7 +66,7 @@ class AddressBookQueryReport implements XmlDeserializable {
     public $filters;
 
     /**
-     * The number of results the client wants
+     * The number of results the client wants.
      *
      * null means it wasn't specified, which in most cases means 'all results'.
      *
@@ -73,7 +75,7 @@ class AddressBookQueryReport implements XmlDeserializable {
     public $limit;
 
     /**
-     * Either 'anyof' or 'allof'
+     * Either 'anyof' or 'allof'.
      *
      * @var string
      */
@@ -95,7 +97,6 @@ class AddressBookQueryReport implements XmlDeserializable {
      */
     public $version = null;
 
-
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -115,65 +116,64 @@ class AddressBookQueryReport implements XmlDeserializable {
      * 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',
+    public 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',
+            '{DAV:}prop' => 'Sabre\\Xml\\Element\\KeyValue',
         ]);
 
         $newProps = [
-            'filters'    => null,
+            'filters' => null,
             'properties' => [],
-            'test'       => 'anyof',
-            'limit'      => null,
+            'test' => 'anyof',
+            'limit' => null,
         ];
 
-        if (!is_array($elems)) $elems = [];
+        if (!is_array($elems)) {
+            $elems = [];
+        }
 
         foreach ($elems as $elem) {
-
             switch ($elem['name']) {
-
-                case '{DAV:}prop' :
+                case '{DAV:}prop':
                     $newProps['properties'] = array_keys($elem['value']);
-                    if (isset($elem['value']['{' . Plugin::NS_CARDDAV . '}address-data'])) {
-                        $newProps += $elem['value']['{' . Plugin::NS_CARDDAV . '}address-data'];
+                    if (isset($elem['value']['{'.Plugin::NS_CARDDAV.'}address-data'])) {
+                        $newProps += $elem['value']['{'.Plugin::NS_CARDDAV.'}address-data'];
                     }
                     break;
-                case '{' . Plugin::NS_CARDDAV . '}filter' :
+                case '{'.Plugin::NS_CARDDAV.'}filter':
 
                     if (!is_null($newProps['filters'])) {
-                        throw new BadRequest('You can only include 1 {' . Plugin::NS_CARDDAV . '}filter element');
+                        throw new BadRequest('You can only include 1 {'.Plugin::NS_CARDDAV.'}filter element');
                     }
                     if (isset($elem['attributes']['test'])) {
                         $newProps['test'] = $elem['attributes']['test'];
-                        if ($newProps['test'] !== 'allof' && $newProps['test'] !== 'anyof') {
+                        if ('allof' !== $newProps['test'] && 'anyof' !== $newProps['test']) {
                             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') {
+                    foreach ((array) $elem['value'] as $subElem) {
+                        if ($subElem['name'] === '{'.Plugin::NS_CARDDAV.'}prop-filter') {
                             $newProps['filters'][] = $subElem['value'];
                         }
                     }
                     break;
-                case '{' . Plugin::NS_CARDDAV . '}limit' :
+                case '{'.Plugin::NS_CARDDAV.'}limit':
                     foreach ($elem['value'] as $child) {
-                        if ($child['name'] === '{' . Plugin::NS_CARDDAV . '}nresults') {
-                            $newProps['limit'] = (int)$child['value'];
+                        if ($child['name'] === '{'.Plugin::NS_CARDDAV.'}nresults') {
+                            $newProps['limit'] = (int) $child['value'];
                         }
                     }
                     break;
-
             }
-
         }
 
         if (is_null($newProps['filters'])) {
@@ -184,7 +184,6 @@ class AddressBookQueryReport implements XmlDeserializable {
              */
             //throw new BadRequest('The {' . Plugin::NS_CARDDAV . '}filter element is required for this request');
             $newProps['filters'] = [];
-
         }
 
         $obj = new self();
@@ -193,7 +192,5 @@ class AddressBookQueryReport implements XmlDeserializable {
         }
 
         return $obj;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBasic.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBasic.php
index 40a95f8bf..aa8b1f573 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBasic.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBasic.php
@@ -1,14 +1,15 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Auth\Backend;
 
-use Sabre\DAV;
 use Sabre\HTTP;
 use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
 
 /**
- * HTTP Basic authentication backend class
+ * 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
@@ -19,8 +20,8 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class AbstractBasic implements BackendInterface {
-
+abstract class AbstractBasic implements BackendInterface
+{
     /**
      * Authentication Realm.
      *
@@ -39,13 +40,14 @@ abstract class AbstractBasic implements BackendInterface {
     protected $principalPrefix = 'principals/';
 
     /**
-     * Validates a username and password
+     * 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);
@@ -54,12 +56,10 @@ abstract class AbstractBasic implements BackendInterface {
      * Sets the authentication realm for this backend.
      *
      * @param string $realm
-     * @return void
      */
-    function setRealm($realm) {
-
+    public function setRealm($realm)
+    {
         $this->realm = $realm;
-
     }
 
     /**
@@ -86,12 +86,13 @@ abstract class AbstractBasic implements BackendInterface {
      *
      * principals/users/[username]
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return array
      */
-    function check(RequestInterface $request, ResponseInterface $response) {
-
+    public function check(RequestInterface $request, ResponseInterface $response)
+    {
         $auth = new HTTP\Auth\Basic(
             $this->realm,
             $request,
@@ -103,10 +104,10 @@ abstract class AbstractBasic implements BackendInterface {
             return [false, "No 'Authorization: Basic' header found. Either the client didn't send one, or the server is misconfigured"];
         }
         if (!$this->validateUserPass($userpass[0], $userpass[1])) {
-            return [false, "Username or password was incorrect"];
+            return [false, 'Username or password was incorrect'];
         }
-        return [true, $this->principalPrefix . $userpass[0]];
 
+        return [true, $this->principalPrefix.$userpass[0]];
     }
 
     /**
@@ -126,19 +127,16 @@ abstract class AbstractBasic implements BackendInterface {
      * append your own WWW-Authenticate header instead of overwriting the
      * existing one.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function challenge(RequestInterface $request, ResponseInterface $response) {
-
+    public 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
index ae7a8a12f..a2653b2b0 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBearer.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractBearer.php
@@ -1,14 +1,15 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Auth\Backend;
 
-use Sabre\DAV;
 use Sabre\HTTP;
 use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
 
 /**
- * HTTP Bearer authentication backend class
+ * 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
@@ -20,8 +21,8 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class AbstractBearer implements BackendInterface {
-
+abstract class AbstractBearer implements BackendInterface
+{
     /**
      * Authentication Realm.
      *
@@ -33,12 +34,13 @@ abstract class AbstractBearer implements BackendInterface {
     protected $realm = 'sabre/dav';
 
     /**
-     * Validates a Bearer token
+     * 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);
@@ -47,12 +49,10 @@ abstract class AbstractBearer implements BackendInterface {
      * Sets the authentication realm for this backend.
      *
      * @param string $realm
-     * @return void
      */
-    function setRealm($realm) {
-
+    public function setRealm($realm)
+    {
         $this->realm = $realm;
-
     }
 
     /**
@@ -79,12 +79,13 @@ abstract class AbstractBearer implements BackendInterface {
      *
      * principals/users/[username]
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return array
      */
-    function check(RequestInterface $request, ResponseInterface $response) {
-
+    public function check(RequestInterface $request, ResponseInterface $response)
+    {
         $auth = new HTTP\Auth\Bearer(
             $this->realm,
             $request,
@@ -97,10 +98,10 @@ abstract class AbstractBearer implements BackendInterface {
         }
         $principalUrl = $this->validateBearerToken($bearerToken);
         if (!$principalUrl) {
-            return [false, "Bearer token was incorrect"];
+            return [false, 'Bearer token was incorrect'];
         }
-        return [true, $principalUrl];
 
+        return [true, $principalUrl];
     }
 
     /**
@@ -120,19 +121,16 @@ abstract class AbstractBearer implements BackendInterface {
      * append your own WWW-Authenticate header instead of overwriting the
      * existing one.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function challenge(RequestInterface $request, ResponseInterface $response) {
-
+    public 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
index 4b47f56c9..06c9ed3a4 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractDigest.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/AbstractDigest.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Auth\Backend;
 
 use Sabre\DAV;
@@ -8,7 +10,7 @@ use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
 
 /**
- * HTTP Digest authentication backend class
+ * 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
@@ -18,8 +20,8 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class AbstractDigest implements BackendInterface {
-
+abstract class AbstractDigest implements BackendInterface
+{
     /**
      * Authentication Realm.
      *
@@ -45,12 +47,10 @@ abstract class AbstractDigest implements BackendInterface {
      * existing hashes will break and nobody can authenticate.
      *
      * @param string $realm
-     * @return void
      */
-    function setRealm($realm) {
-
+    public function setRealm($realm)
+    {
         $this->realm = $realm;
-
     }
 
     /**
@@ -60,9 +60,10 @@ abstract class AbstractDigest implements BackendInterface {
      *
      * @param string $realm
      * @param string $username
+     *
      * @return string|null
      */
-    abstract function getDigestHash($realm, $username);
+    abstract public function getDigestHash($realm, $username);
 
     /**
      * When this method is called, the backend must check if authentication was
@@ -88,12 +89,13 @@ abstract class AbstractDigest implements BackendInterface {
      *
      * principals/users/[username]
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return array
      */
-    function check(RequestInterface $request, ResponseInterface $response) {
-
+    public function check(RequestInterface $request, ResponseInterface $response)
+    {
         $digest = new HTTP\Auth\Digest(
             $this->realm,
             $request,
@@ -110,8 +112,8 @@ abstract class AbstractDigest implements BackendInterface {
 
         $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 (false === $hash || is_null($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');
@@ -119,11 +121,10 @@ abstract class AbstractDigest implements BackendInterface {
 
         // 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 [false, 'Username or password was incorrect'];
         }
 
-        return [true, $this->principalPrefix . $username];
-
+        return [true, $this->principalPrefix.$username];
     }
 
     /**
@@ -143,12 +144,11 @@ abstract class AbstractDigest implements BackendInterface {
      * append your own WWW-Authenticate header instead of overwriting the
      * existing one.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function challenge(RequestInterface $request, ResponseInterface $response) {
-
+    public function challenge(RequestInterface $request, ResponseInterface $response)
+    {
         $auth = new HTTP\Auth\Digest(
             $this->realm,
             $request,
@@ -162,7 +162,5 @@ abstract class AbstractDigest implements BackendInterface {
         // Preventing the digest utility from modifying the http status code,
         // this should be handled by the main plugin.
         $response->setStatus($oldStatus);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/Apache.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/Apache.php
index e203d2685..201fe615c 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Backend/Apache.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/Apache.php
@@ -1,24 +1,26 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Auth\Backend;
 
 use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
 
 /**
- * Apache authenticator
+ * Apache (or NGINX) authenticator.
  *
  * This authentication backend assumes that authentication has been
- * configured in apache, rather than within SabreDAV.
+ * configured in apache (or NGINX), rather than within SabreDAV.
  *
- * Make sure apache is properly configured for this to work.
+ * Make sure apache (or NGINX) 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 {
-
+class Apache implements BackendInterface
+{
     /**
      * This is the prefix that will be used to generate principal urls.
      *
@@ -50,22 +52,25 @@ class Apache implements BackendInterface {
      *
      * principals/users/[username]
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return array
      */
-    function check(RequestInterface $request, ResponseInterface $response) {
-
+    public 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'];
+            $remoteUser = $request->getRawServerValue('PHP_AUTH_USER');
+        }
+        if (is_null($remoteUser)) {
+            return [false, 'No REMOTE_USER, REDIRECT_REMOTE_USER, or PHP_AUTH_USER property was found in the PHP $_SERVER super-global. This likely means your server is not configured correctly'];
         }
 
-        return [true, $this->principalPrefix . $remoteUser];
-
+        return [true, $this->principalPrefix.$remoteUser];
     }
 
     /**
@@ -85,12 +90,10 @@ class Apache implements BackendInterface {
      * append your own WWW-Authenticate header instead of overwriting the
      * existing one.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function challenge(RequestInterface $request, ResponseInterface $response) {
-
+    public 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
index 0fb2210f4..8598791fb 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Backend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/BackendInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Auth\Backend;
 
 use Sabre\HTTP\RequestInterface;
@@ -12,8 +14,8 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface BackendInterface {
-
+interface BackendInterface
+{
     /**
      * When this method is called, the backend must check if authentication was
      * successful.
@@ -38,11 +40,12 @@ interface BackendInterface {
      *
      * principals/users/[username]
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return array
      */
-    function check(RequestInterface $request, ResponseInterface $response);
+    public function check(RequestInterface $request, ResponseInterface $response);
 
     /**
      * This method is called when a user could not be authenticated, and
@@ -61,10 +64,8 @@ interface BackendInterface {
      * append your own WWW-Authenticate header instead of overwriting the
      * existing one.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function challenge(RequestInterface $request, ResponseInterface $response);
-
+    public 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
index 7ad8f48b2..aab3c5e1c 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Backend/BasicCallBack.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/BasicCallBack.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Auth\Backend;
 
 /**
@@ -14,10 +16,10 @@ namespace Sabre\DAV\Auth\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class BasicCallBack extends AbstractBasic {
-
+class BasicCallBack extends AbstractBasic
+{
     /**
-     * Callback
+     * Callback.
      *
      * @var callable
      */
@@ -30,29 +32,27 @@ class BasicCallBack extends AbstractBasic {
      * password.
      *
      * @param callable $callBack
-     * @return void
      */
-    function __construct(callable $callBack) {
-
+    public function __construct(callable $callBack)
+    {
         $this->callBack = $callBack;
-
     }
 
     /**
-     * Validates a username and password
+     * 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, $password) {
-
+    protected function validateUserPass($username, $password)
+    {
         $cb = $this->callBack;
-        return $cb($username, $password);
 
+        return $cb($username, $password);
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/File.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/File.php
index 3a687d747..ea2d39679 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Backend/File.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/File.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Auth\Backend;
 
 use Sabre\DAV;
@@ -13,10 +15,10 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class File extends AbstractDigest {
-
+class File extends AbstractDigest
+{
     /**
-     * List of users
+     * List of users.
      *
      * @var array
      */
@@ -29,11 +31,11 @@ class File extends AbstractDigest {
      *
      * @param string|null $filename
      */
-    function __construct($filename = null) {
-
-        if (!is_null($filename))
+    public function __construct($filename = null)
+    {
+        if (!is_null($filename)) {
             $this->loadFile($filename);
-
+        }
     }
 
     /**
@@ -41,37 +43,32 @@ class File extends AbstractDigest {
      * more than 1 file is used.
      *
      * @param string $filename
-     * @return void
      */
-    function loadFile($filename) {
-
+    public function loadFile($filename)
+    {
         foreach (file($filename, FILE_IGNORE_NEW_LINES) as $line) {
-
-            if (substr_count($line, ":") !== 2)
+            if (2 !== substr_count($line, ':')) {
                 throw new DAV\Exception('Malformed htdigest file. Every line should contain 2 colons');
-
+            }
             list($username, $realm, $A1) = explode(':', $line);
 
-            if (!preg_match('/^[a-zA-Z0-9]{32}$/', $A1))
+            if (!preg_match('/^[a-zA-Z0-9]{32}$/', $A1)) {
                 throw new DAV\Exception('Malformed htdigest file. Invalid md5 hash');
-
-            $this->users[$realm . ':' . $username] = $A1;
-
+            }
+            $this->users[$realm.':'.$username] = $A1;
         }
-
     }
 
     /**
-     * Returns a users' information
+     * Returns a users' information.
      *
      * @param string $realm
      * @param string $username
+     *
      * @return string
      */
-    function getDigestHash($realm, $username) {
-
-        return isset($this->users[$realm . ':' . $username]) ? $this->users[$realm . ':' . $username] : false;
-
+    public function getDigestHash($realm, $username)
+    {
+        return isset($this->users[$realm.':'.$username]) ? $this->users[$realm.':'.$username] : false;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/IMAP.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/IMAP.php
new file mode 100644
index 000000000..3a1831116
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/IMAP.php
@@ -0,0 +1,82 @@
+<?php
+
+namespace Sabre\DAV\Auth\Backend;
+
+/**
+ * This is an authentication backend that uses imap.
+ *
+ * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
+ * @author Michael Niewöhner (foss@mniewoehner.de)
+ * @author rosali (https://github.com/rosali)
+ * @author Evert Pot (http://evertpot.com/)
+ * @license http://sabre.io/license/ Modified BSD License
+ */
+class IMAP extends AbstractBasic
+{
+    /**
+     * IMAP server in the form {host[:port][/flag1/flag2...]}.
+     *
+     * @see http://php.net/manual/en/function.imap-open.php
+     *
+     * @var string
+     */
+    protected $mailbox;
+
+    /**
+     * Creates the backend object.
+     *
+     * @param string $mailbox
+     */
+    public function __construct($mailbox)
+    {
+        $this->mailbox = $mailbox;
+    }
+
+    /**
+     * Connects to an IMAP server and tries to authenticate.
+     *
+     * @param string $username
+     * @param string $password
+     *
+     * @return bool
+     */
+    protected function imapOpen($username, $password)
+    {
+        $success = false;
+
+        try {
+            $imap = imap_open($this->mailbox, $username, $password, OP_HALFOPEN | OP_READONLY, 1);
+            if ($imap) {
+                $success = true;
+            }
+        } catch (\ErrorException $e) {
+            error_log($e->getMessage());
+        }
+
+        $errors = imap_errors();
+        if ($errors) {
+            foreach ($errors as $error) {
+                error_log($error);
+            }
+        }
+
+        if (isset($imap) && $imap) {
+            imap_close($imap);
+        }
+
+        return $success;
+    }
+
+    /**
+     * Validates a username and password by trying to authenticate against IMAP.
+     *
+     * @param string $username
+     * @param string $password
+     *
+     * @return bool
+     */
+    protected function validateUserPass($username, $password)
+    {
+        return $this->imapOpen($username, $password);
+    }
+}
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Backend/PDO.php b/vendor/sabre/dav/lib/DAV/Auth/Backend/PDO.php
index c2f6de974..87ead6fcd 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Backend/PDO.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Backend/PDO.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Auth\Backend;
 
 /**
@@ -9,23 +11,22 @@ namespace Sabre\DAV\Auth\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PDO extends AbstractDigest {
-
+class PDO extends AbstractDigest
+{
     /**
-     * Reference to PDO connection
+     * Reference to PDO connection.
      *
      * @var PDO
      */
     protected $pdo;
 
     /**
-     * PDO table name we'll be using
+     * PDO table name we'll be using.
      *
      * @var string
      */
     public $tableName = 'users';
 
-
     /**
      * Creates the backend object.
      *
@@ -33,10 +34,9 @@ class PDO extends AbstractDigest {
      *
      * @param \PDO $pdo
      */
-    function __construct(\PDO $pdo) {
-
+    public function __construct(\PDO $pdo)
+    {
         $this->pdo = $pdo;
-
     }
 
     /**
@@ -44,14 +44,14 @@ class PDO extends AbstractDigest {
      *
      * @param string $realm
      * @param string $username
+     *
      * @return string|null
      */
-    function getDigestHash($realm, $username) {
-
-        $stmt = $this->pdo->prepare('SELECT digesta1 FROM ' . $this->tableName . ' WHERE username = ?');
+    public function getDigestHash($realm, $username)
+    {
+        $stmt = $this->pdo->prepare('SELECT digesta1 FROM '.$this->tableName.' WHERE username = ?');
         $stmt->execute([$username]);
-        return $stmt->fetchColumn() ?: null;
 
+        return $stmt->fetchColumn() ?: null;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Auth/Plugin.php b/vendor/sabre/dav/lib/DAV/Auth/Plugin.php
index bbb5d180d..9be90283f 100644
--- a/vendor/sabre/dav/lib/DAV/Auth/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Auth/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Auth;
 
 use Sabre\DAV\Exception\NotAuthenticated;
@@ -22,8 +24,8 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends ServerPlugin {
-
+class Plugin extends ServerPlugin
+{
     /**
      * By default this plugin will require that the user is authenticated,
      * and refuse any access if the user is not authenticated.
@@ -39,7 +41,7 @@ class Plugin extends ServerPlugin {
     public $autoRequireLogin = true;
 
     /**
-     * authentication backends
+     * authentication backends.
      */
     protected $backends;
 
@@ -52,40 +54,35 @@ class Plugin extends ServerPlugin {
     protected $currentPrincipal;
 
     /**
-     * Creates the authentication plugin
+     * Creates the authentication plugin.
      *
      * @param Backend\BackendInterface $authBackend
      */
-    function __construct(Backend\BackendInterface $authBackend = null) {
-
+    public 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) {
-
+    public function addBackend(Backend\BackendInterface $authBackend)
+    {
         $this->backends[] = $authBackend;
-
     }
 
     /**
-     * Initializes the plugin. This function is automatically called by the server
+     * 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);
-
+    public function initialize(Server $server)
+    {
+        $server->on('beforeMethod:*', [$this, 'beforeMethod'], 10);
     }
 
     /**
@@ -96,10 +93,9 @@ class Plugin extends ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'auth';
-
     }
 
     /**
@@ -114,23 +110,22 @@ class Plugin extends ServerPlugin {
      *
      * @return string|null
      */
-    function getCurrentPrincipal() {
-
+    public function getCurrentPrincipal()
+    {
         return $this->currentPrincipal;
-
     }
 
     /**
-     * This method is called before any HTTP method and forces users to be authenticated
+     * This method is called before any HTTP method and forces users to be authenticated.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function beforeMethod(RequestInterface $request, ResponseInterface $response) {
-
+    public 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.
@@ -144,7 +139,6 @@ class Plugin extends ServerPlugin {
             //
             // See issue #580 for more information about that.
             return;
-
         }
 
         $authResult = $this->check($request, $response);
@@ -153,11 +147,10 @@ class Plugin extends ServerPlugin {
             // Auth was successful
             $this->currentPrincipal = $authResult[1];
             $this->loginFailedReasons = null;
+
             return;
         }
 
-
-
         // If we got here, it means that no authentication backend was
         // successful in authenticating the user.
         $this->currentPrincipal = null;
@@ -167,7 +160,6 @@ class Plugin extends ServerPlugin {
             $this->challenge($request, $response);
             throw new NotAuthenticated(implode(', ', $authResult[1]));
         }
-
     }
 
     /**
@@ -184,24 +176,24 @@ class Plugin extends ServerPlugin {
      * unsuccessful. For every auth backend there will be one reason, so usually
      * there's just one.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return array
      */
-    function check(RequestInterface $request, ResponseInterface $response) {
-
+    public function check(RequestInterface $request, ResponseInterface $response)
+    {
         if (!$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])) {
+            if (!is_array($result) || 2 !== count($result) || !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.');
             }
 
@@ -211,11 +203,9 @@ class Plugin extends ServerPlugin {
                 return [true, $result[1]];
             }
             $reasons[] = $result[1];
-
         }
 
         return [false, $reasons];
-
     }
 
     /**
@@ -225,16 +215,16 @@ class Plugin extends ServerPlugin {
      * WWW-Authorization header, indicating to the client that it should
      * authenticate.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return array
      */
-    function challenge(RequestInterface $request, ResponseInterface $response) {
-
+    public function challenge(RequestInterface $request, ResponseInterface $response)
+    {
         foreach ($this->backends as $backend) {
             $backend->challenge($request, $response);
         }
-
     }
 
     /**
@@ -255,10 +245,9 @@ class Plugin extends ServerPlugin {
      *
      * @return string[]|null
      */
-    function getLoginFailedReasons() {
-
+    public function getLoginFailedReasons()
+    {
         return $this->loginFailedReasons;
-
     }
 
     /**
@@ -272,14 +261,12 @@ class Plugin extends ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Generic authentication plugin',
-            'link'        => 'http://sabre.io/dav/authentication/',
+            'link' => 'http://sabre.io/dav/authentication/',
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Browser/GuessContentType.php b/vendor/sabre/dav/lib/DAV/Browser/GuessContentType.php
index 3ba2aee25..7466babb3 100644
--- a/vendor/sabre/dav/lib/DAV/Browser/GuessContentType.php
+++ b/vendor/sabre/dav/lib/DAV/Browser/GuessContentType.php
@@ -1,14 +1,16 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Browser;
 
 use Sabre\DAV;
-use Sabre\DAV\Inode;
+use Sabre\DAV\INode;
 use Sabre\DAV\PropFind;
-use Sabre\HTTP\URLUtil;
+use Sabre\Uri;
 
 /**
- * GuessContentType plugin
+ * GuessContentType plugin.
  *
  * A lot of the built-in File objects just return application/octet-stream
  * as a content-type by default. This is a problem for some clients, because
@@ -22,17 +24,16 @@ use Sabre\HTTP\URLUtil;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class GuessContentType extends DAV\ServerPlugin {
-
+class GuessContentType extends DAV\ServerPlugin
+{
     /**
-     * List of recognized file extensions
+     * List of recognized file extensions.
      *
      * Feel free to add more
      *
      * @var array
      */
     public $extensionMap = [
-
         // images
         'jpg' => 'image/jpeg',
         'gif' => 'image/gif',
@@ -44,58 +45,52 @@ class GuessContentType extends DAV\ServerPlugin {
 
         // text
         'txt' => 'text/plain',
-
     ];
 
     /**
-     * Initializes the plugin
+     * Initializes the plugin.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public function initialize(DAV\Server $server)
+    {
         // Using a relatively low priority (200) to allow other extensions
         // to set the content-type first.
         $server->on('propFind', [$this, 'propFind'], 200);
-
     }
 
     /**
-     * Our PROPFIND handler
+     * Our PROPFIND handler.
      *
      * Here we set a contenttype, if the node didn't already have one.
      *
      * @param PropFind $propFind
-     * @param INode $node
-     * @return void
+     * @param INode    $node
      */
-    function propFind(PropFind $propFind, INode $node) {
-
-        $propFind->handle('{DAV:}getcontenttype', function() use ($propFind) {
+    public function propFind(PropFind $propFind, INode $node)
+    {
+        $propFind->handle('{DAV:}getcontenttype', function () use ($propFind) {
+            list(, $fileName) = Uri\split($propFind->getPath());
 
-            list(, $fileName) = URLUtil::splitPath($propFind->getPath());
             return $this->getContentType($fileName);
-
         });
-
     }
 
     /**
-     * Simple method to return the contenttype
+     * Simple method to return the contenttype.
      *
      * @param string $fileName
+     *
      * @return string
      */
-    protected function getContentType($fileName) {
-
+    protected function getContentType($fileName)
+    {
         // Just grabbing the extension
         $extension = strtolower(substr($fileName, strrpos($fileName, '.') + 1));
         if (isset($this->extensionMap[$extension])) {
             return $this->extensionMap[$extension];
         }
-        return 'application/octet-stream';
 
+        return 'application/octet-stream';
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Browser/HtmlOutput.php b/vendor/sabre/dav/lib/DAV/Browser/HtmlOutput.php
index f4be6b348..59b3f5604 100644
--- a/vendor/sabre/dav/lib/DAV/Browser/HtmlOutput.php
+++ b/vendor/sabre/dav/lib/DAV/Browser/HtmlOutput.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Browser;
 
 /**
@@ -13,8 +15,8 @@ namespace Sabre\DAV\Browser;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface HtmlOutput {
-
+interface HtmlOutput
+{
     /**
      * Generate html representation for this value.
      *
@@ -27,8 +29,8 @@ interface HtmlOutput {
      * be used to construct local links.
      *
      * @param HtmlOutputHelper $html
+     *
      * @return string
      */
-    function toHtml(HtmlOutputHelper $html);
-
+    public function toHtml(HtmlOutputHelper $html);
 }
diff --git a/vendor/sabre/dav/lib/DAV/Browser/HtmlOutputHelper.php b/vendor/sabre/dav/lib/DAV/Browser/HtmlOutputHelper.php
index 249d54047..a7c747437 100644
--- a/vendor/sabre/dav/lib/DAV/Browser/HtmlOutputHelper.php
+++ b/vendor/sabre/dav/lib/DAV/Browser/HtmlOutputHelper.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Browser;
 
 use Sabre\Uri;
@@ -13,8 +15,8 @@ use Sabre\Xml\Service as XmlService;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class HtmlOutputHelper {
-
+class HtmlOutputHelper
+{
     /**
      * Link to the root of the application.
      *
@@ -40,13 +42,12 @@ class HtmlOutputHelper {
      * that can be used to make output a lot shorter.
      *
      * @param string $baseUri
-     * @param array $namespaceMap
+     * @param array  $namespaceMap
      */
-    function __construct($baseUri, array $namespaceMap) {
-
+    public function __construct($baseUri, array $namespaceMap)
+    {
         $this->baseUri = $baseUri;
         $this->namespaceMap = $namespaceMap;
-
     }
 
     /**
@@ -58,24 +59,24 @@ class HtmlOutputHelper {
      * Absolute urls are left alone.
      *
      * @param string $path
+     *
      * @return string
      */
-    function fullUrl($path) {
-
+    public function fullUrl($path)
+    {
         return Uri\resolve($this->baseUri, $path);
-
     }
 
     /**
      * Escape string for HTML output.
      *
-     * @param string $input
+     * @param scalar $input
+     *
      * @return string
      */
-    function h($input) {
-
-        return htmlspecialchars($input, ENT_COMPAT, 'UTF-8');
-
+    public function h($input)
+    {
+        return htmlspecialchars((string) $input, ENT_COMPAT, 'UTF-8');
     }
 
     /**
@@ -86,13 +87,14 @@ class HtmlOutputHelper {
      *
      * @param string $url
      * @param string $label
+     *
      * @return string
      */
-    function link($url, $label = null) {
-
+    public function link($url, $label = null)
+    {
         $url = $this->h($this->fullUrl($url));
-        return '<a href="' . $url . '">' . ($label ? $this->h($label) : $url) . '</a>';
 
+        return '<a href="'.$url.'">'.($label ? $this->h($label) : $url).'</a>';
     }
 
     /**
@@ -100,18 +102,18 @@ class HtmlOutputHelper {
      * shortened version with a prefix, if it was a known namespace.
      *
      * @param string $element
+     *
      * @return string
      */
-    function xmlName($element) {
-
+    public function xmlName($element)
+    {
         list($ns, $localName) = XmlService::parseClarkNotation($element);
         if (isset($this->namespaceMap[$ns])) {
-            $propName = $this->namespaceMap[$ns] . ':' . $localName;
+            $propName = $this->namespaceMap[$ns].':'.$localName;
         } else {
             $propName = $element;
         }
-        return "<span title=\"" . $this->h($element) . "\">" . $this->h($propName) . "</span>";
 
+        return '<span title="'.$this->h($element).'">'.$this->h($propName).'</span>';
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Browser/MapGetToPropFind.php b/vendor/sabre/dav/lib/DAV/Browser/MapGetToPropFind.php
index 61327c49a..25e061128 100644
--- a/vendor/sabre/dav/lib/DAV/Browser/MapGetToPropFind.php
+++ b/vendor/sabre/dav/lib/DAV/Browser/MapGetToPropFind.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Browser;
 
 use Sabre\DAV;
@@ -16,45 +18,46 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class MapGetToPropFind extends DAV\ServerPlugin {
-
+class MapGetToPropFind extends DAV\ServerPlugin
+{
     /**
-     * reference to server class
+     * reference to server class.
      *
      * @var DAV\Server
      */
     protected $server;
 
     /**
-     * Initializes the plugin and subscribes to events
+     * Initializes the plugin and subscribes to events.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public function initialize(DAV\Server $server)
+    {
         $this->server = $server;
         $this->server->on('method:GET', [$this, 'httpGet'], 90);
     }
 
     /**
-     * This method intercepts GET requests to non-files, and changes it into an HTTP PROPFIND request
+     * This method intercepts GET requests to non-files, and changes it into an HTTP PROPFIND request.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpGet(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpGet(RequestInterface $request, ResponseInterface $response)
+    {
         $node = $this->server->tree->getNodeForPath($request->getPath());
-        if ($node instanceof DAV\IFile) return;
+        if ($node instanceof DAV\IFile) {
+            return;
+        }
 
         $subRequest = clone $request;
         $subRequest->setMethod('PROPFIND');
 
         $this->server->invokeMethod($subRequest, $response);
-        return false;
 
+        return false;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Browser/Plugin.php b/vendor/sabre/dav/lib/DAV/Browser/Plugin.php
index 545ad5633..e2fab4b79 100644
--- a/vendor/sabre/dav/lib/DAV/Browser/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Browser/Plugin.php
@@ -1,15 +1,18 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Browser;
 
 use Sabre\DAV;
 use Sabre\DAV\MkCol;
+use Sabre\HTTP;
 use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
-use Sabre\HTTP\URLUtil;
+use Sabre\Uri;
 
 /**
- * Browser Plugin
+ * Browser Plugin.
  *
  * This plugin provides a html representation, so that a WebDAV server may be accessed
  * using a browser.
@@ -21,10 +24,10 @@ use Sabre\HTTP\URLUtil;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends DAV\ServerPlugin {
-
+class Plugin extends DAV\ServerPlugin
+{
     /**
-     * reference to server class
+     * reference to server class.
      *
      * @var DAV\Server
      */
@@ -60,53 +63,54 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @param bool $enablePost
      */
-    function __construct($enablePost = true) {
-
+    public function __construct($enablePost = true)
+    {
         $this->enablePost = $enablePost;
-
     }
 
     /**
-     * Initializes the plugin and subscribes to events
+     * Initializes the plugin and subscribes to events.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public 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']);
+        if ($this->enablePost) {
+            $this->server->on('method:POST', [$this, 'httpPOST']);
+        }
     }
 
     /**
      * This method intercepts GET requests that have ?sabreAction=info
-     * appended to the URL
+     * appended to the URL.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpGetEarly(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpGetEarly(RequestInterface $request, ResponseInterface $response)
+    {
         $params = $request->getQueryParameters();
-        if (isset($params['sabreAction']) && $params['sabreAction'] === 'info') {
+        if (isset($params['sabreAction']) && 'info' === $params['sabreAction']) {
             return $this->httpGet($request, $response);
         }
-
     }
 
     /**
-     * This method intercepts GET requests to collections and returns the html
+     * This method intercepts GET requests to collections and returns the html.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpGet(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpGet(RequestInterface $request, ResponseInterface $response)
+    {
         // We're not using straight-up $_GET, because we want everything to be
         // unit testable.
         $getVars = $request->getQueryParameters();
@@ -117,13 +121,13 @@ class Plugin extends DAV\ServerPlugin {
         $sabreAction = isset($getVars['sabreAction']) ? $getVars['sabreAction'] : null;
 
         switch ($sabreAction) {
-
-            case 'asset' :
+            case 'asset':
                 // Asset handling, such as images
                 $this->serveAsset(isset($getVars['assetName']) ? $getVars['assetName'] : null);
+
                 return false;
-            default :
-            case 'info' :
+            default:
+            case 'info':
                 try {
                     $this->server->tree->getNodeForPath($request->getPath());
                 } catch (DAV\Exception\NotFound $e) {
@@ -141,7 +145,7 @@ class Plugin extends DAV\ServerPlugin {
 
                 return false;
 
-            case 'plugins' :
+            case 'plugins':
                 $response->setStatus(200);
                 $response->setHeader('Content-Type', 'text/html; charset=utf-8');
 
@@ -150,41 +154,39 @@ class Plugin extends DAV\ServerPlugin {
                 );
 
                 return false;
-
         }
-
     }
 
     /**
      * Handles POST requests for tree operations.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpPOST(RequestInterface $request, ResponseInterface $response) {
-
+    public 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;
+        if ('application/x-www-form-urlencoded' !== $contentType &&
+            'multipart/form-data' !== $contentType) {
+            return;
         }
         $postVars = $request->getPostData();
 
-        if (!isset($postVars['sabreAction']))
+        if (!isset($postVars['sabreAction'])) {
             return;
+        }
 
         $uri = $request->getPath();
 
         if ($this->server->emit('onBrowserPostAction', [$uri, $postVars['sabreAction'], $postVars])) {
-
             switch ($postVars['sabreAction']) {
-
-                case 'mkcol' :
+                case 'mkcol':
                     if (isset($postVars['name']) && trim($postVars['name'])) {
                         // Using basename() because we won't allow slashes
-                        list(, $folderName) = URLUtil::splitPath(trim($postVars['name']));
+                        list(, $folderName) = Uri\split(trim($postVars['name']));
 
                         if (isset($postVars['resourceType'])) {
                             $resourceType = explode(',', $postVars['resourceType']);
@@ -196,7 +198,7 @@ class Plugin extends DAV\ServerPlugin {
                         foreach ($postVars as $varName => $varValue) {
                             // Any _POST variable in clark notation is treated
                             // like a property.
-                            if ($varName[0] === '{') {
+                            if ('{' === $varName[0]) {
                                 // PHP will convert any dots to underscores.
                                 // This leaves us with no way to differentiate
                                 // the two.
@@ -212,65 +214,67 @@ class Plugin extends DAV\ServerPlugin {
                             $resourceType,
                             $properties
                         );
-                        $this->server->createCollection($uri . '/' . $folderName, $mkCol);
+                        $this->server->createCollection($uri.'/'.$folderName, $mkCol);
                     }
                     break;
 
                 // @codeCoverageIgnoreStart
-                case 'put' :
+                case 'put':
 
-                    if ($_FILES) $file = current($_FILES);
-                    else break;
+                    if ($_FILES) {
+                        $file = current($_FILES);
+                    } else {
+                        break;
+                    }
 
-                    list(, $newName) = URLUtil::splitPath(trim($file['name']));
-                    if (isset($postVars['name']) && trim($postVars['name']))
+                    list(, $newName) = Uri\split(trim($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);
+                    list(, $newName) = Uri\split($newName);
 
                     if (is_uploaded_file($file['tmp_name'])) {
-                        $this->server->createFile($uri . '/' . $newName, fopen($file['tmp_name'], 'r'));
+                        $this->server->createFile($uri.'/'.$newName, fopen($file['tmp_name'], 'r'));
                     }
                     break;
                 // @codeCoverageIgnoreEnd
-
             }
-
         }
         $response->setHeader('Location', $request->getUrl());
         $response->setStatus(302);
-        return false;
 
+        return false;
     }
 
     /**
      * Escapes a string for html.
      *
      * @param string $value
+     *
      * @return string
      */
-    function escapeHTML($value) {
-
+    public function escapeHTML($value)
+    {
         return htmlspecialchars($value, ENT_QUOTES, 'UTF-8');
-
     }
 
     /**
-     * Generates the html directory index for a given url
+     * Generates the html directory index for a given url.
      *
      * @param string $path
+     *
      * @return string
      */
-    function generateDirectoryIndex($path) {
-
+    public 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\">";
+            $html .= '<table class="nodeTable">';
 
             $subNodes = $this->server->getPropertiesForChildren($path, [
                 '{DAV:}displayname',
@@ -281,10 +285,9 @@ class Plugin extends DAV\ServerPlugin {
             ]);
 
             foreach ($subNodes as $subPath => $subProps) {
-
                 $subNode = $this->server->tree->getNodeForPath($subPath);
-                $fullPath = $this->server->getBaseUri() . URLUtil::encodePath($subPath);
-                list(, $displayPath) = URLUtil::splitPath($subPath);
+                $fullPath = $this->server->getBaseUri().HTTP\encodePath($subPath);
+                list(, $displayPath) = Uri\split($subPath);
 
                 $subNodes[$subPath]['subNode'] = $subNode;
                 $subNodes[$subPath]['fullPath'] = $fullPath;
@@ -295,43 +298,46 @@ class Plugin extends DAV\ServerPlugin {
             foreach ($subNodes as $subProps) {
                 $type = [
                     'string' => 'Unknown',
-                    'icon'   => 'cog',
+                    'icon' => 'cog',
                 ];
                 if (isset($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>';
+                $html .= '<td class="nameColumn"><a href="'.$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 .= $this->escapeHTML($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'));
                 }
+                $html .= '</td><td>';
+                if (isset($subProps['{DAV:}displayname'])) {
+                    $html .= $this->escapeHTML($subProps['{DAV:}displayname']);
+                }
                 $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>';
+                    $buttonActions = '<a href="'.$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>';
+                $html .= '<td>'.$buttonActions.'</td>';
                 $html .= '</tr>';
             }
 
             $html .= '</table>';
-
         }
 
-        $html .= "</section>";
-        $html .= "<section><h1>Properties</h1>";
-        $html .= "<table class=\"propTable\">";
+        $html .= '</section>';
+        $html .= '<section><h1>Properties</h1>';
+        $html .= '<table class="propTable">';
 
         // Allprops request
         $propFind = new PropFindAll($path);
@@ -343,12 +349,10 @@ class Plugin extends DAV\ServerPlugin {
             if (!in_array($propName, $this->uninterestingProperties)) {
                 $html .= $this->drawPropertyRow($propName, $propValue);
             }
-
         }
 
-
-        $html .= "</table>";
-        $html .= "</section>";
+        $html .= '</table>';
+        $html .= '</section>';
 
         /* Start of generating actions */
 
@@ -358,8 +362,7 @@ class Plugin extends DAV\ServerPlugin {
         }
 
         if ($output) {
-
-            $html .= "<section><h1>Actions</h1>";
+            $html .= '<section><h1>Actions</h1>';
             $html .= "<div class=\"actions\">\n";
             $html .= $output;
             $html .= "</div>\n";
@@ -371,7 +374,6 @@ class Plugin extends DAV\ServerPlugin {
         $this->server->httpResponse->setHeader('Content-Security-Policy', "default-src 'none'; img-src 'self'; style-src 'self'; font-src 'self';");
 
         return $html;
-
     }
 
     /**
@@ -379,31 +381,30 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function generatePluginListing() {
-
+    public function generatePluginListing()
+    {
         $html = $this->generateHeader('Plugins');
 
-        $html .= "<section><h1>Plugins</h1>";
-        $html .= "<table class=\"propTable\">";
+        $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>';
+            $html .= '<tr><th>'.$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>';
+                $html .= '<a href="'.$this->escapeHTML($info['link']).'"><span class="oi" data-glyph="book"></span></a>';
             }
             $html .= '</td></tr>';
         }
-        $html .= "</table>";
-        $html .= "</section>";
+        $html .= '</table>';
+        $html .= '</section>';
 
         /* Start of generating actions */
 
         $html .= $this->generateFooter();
 
         return $html;
-
     }
 
     /**
@@ -414,22 +415,23 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @param string $title
      * @param string $path
+     *
      * @return string
      */
-    function generateHeader($title, $path = null) {
-
+    public function generateHeader($title, $path = null)
+    {
         $version = '';
         if (DAV\Server::$exposeVersion) {
             $version = DAV\Version::VERSION;
         }
 
         $vars = [
-            'title'     => $this->escapeHTML($title),
-            'favicon'   => $this->escapeHTML($this->getAssetUrl('favicon.ico')),
-            'style'     => $this->escapeHTML($this->getAssetUrl('sabredav.css')),
+            '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(),
+            'logo' => $this->escapeHTML($this->getAssetUrl('sabredav.png')),
+            'baseUrl' => $this->server->getBaseUri(),
         ];
 
         $html = <<<HTML
@@ -453,20 +455,19 @@ class Plugin extends DAV\ServerPlugin {
 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="' . $fullPath . '" class="btn">⇤ Go to parent</a>';
+        if ($path) {
+            list($parentUri) = Uri\split($path);
+            $fullPath = $this->server->getBaseUri().HTTP\encodePath($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>";
+        $html .= '</nav>';
 
         return $html;
-
     }
 
     /**
@@ -476,18 +477,19 @@ HTML;
      *
      * @return string
      */
-    function generateFooter() {
-
+    public function generateFooter()
+    {
         $version = '';
         if (DAV\Server::$exposeVersion) {
             $version = DAV\Version::VERSION;
         }
+        $year = date('Y');
+
         return <<<HTML
-<footer>Generated by SabreDAV $version (c)2007-2016 <a href="http://sabre.io/">http://sabre.io/</a></footer>
+<footer>Generated by SabreDAV $version (c)2007-$year <a href="http://sabre.io/">http://sabre.io/</a></footer>
 </body>
 </html>
 HTML;
-
     }
 
     /**
@@ -498,19 +500,20 @@ HTML;
      * creating new directories.
      *
      * @param DAV\INode $node
-     * @param mixed $output
-     * @param string $path
-     * @return void
+     * @param mixed     $output
+     * @param string    $path
      */
-    function htmlActionsPanel(DAV\INode $node, &$output, $path) {
-
-        if (!$node instanceof DAV\ICollection)
+    public function htmlActionsPanel(DAV\INode $node, &$output, $path)
+    {
+        if (!$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($node) === 'Sabre\\DAV\\SimpleCollection')
+        if ('Sabre\\DAV\\SimpleCollection' === get_class($node)) {
             return;
+        }
 
         $output .= <<<HTML
 <form method="post" action="">
@@ -527,7 +530,6 @@ HTML;
 <input type="submit" value="upload" />
 </form>
 HTML;
-
     }
 
     /**
@@ -535,32 +537,35 @@ HTML;
      * suiteable for http access.
      *
      * @param string $assetName
+     *
      * @return string
      */
-    protected function getAssetUrl($assetName) {
-
-        return $this->server->getBaseUri() . '?sabreAction=asset&assetName=' . urlencode($assetName);
-
+    protected function getAssetUrl($assetName)
+    {
+        return $this->server->getBaseUri().'?sabreAction=asset&assetName='.urlencode($assetName);
     }
 
     /**
      * This method returns a local pathname to an asset.
      *
      * @param string $assetName
+     *
      * @throws DAV\Exception\NotFound
+     *
      * @return string
      */
-    protected function getLocalAssetPath($assetName) {
-
-        $assetDir = __DIR__ . '/assets/';
-        $path = $assetDir . $assetName;
+    protected function getLocalAssetPath($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($path, '/') === '/..') {
+        if (false !== strpos($path, '/../') || '/..' === 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)) {
+        $realPath = realpath($path);
+        if ($realPath && 0 === strpos($realPath, realpath($assetDir)) && file_exists($path)) {
             return $path;
         }
         throw new DAV\Exception\NotFound('Path does not exist, or escaping from the base path was detected');
@@ -570,10 +575,9 @@ HTML;
      * This method reads an asset from disk and generates a full http response.
      *
      * @param string $assetName
-     * @return void
      */
-    protected function serveAsset($assetName) {
-
+    protected function serveAsset($assetName)
+    {
         $assetPath = $this->getLocalAssetPath($assetName);
 
         // Rudimentary mime type detection
@@ -594,7 +598,6 @@ HTML;
         $this->server->httpResponse->setHeader('Cache-Control', 'public, max-age=1209600');
         $this->server->httpResponse->setStatus(200);
         $this->server->httpResponse->setBody(fopen($assetPath, 'r'));
-
     }
 
     /**
@@ -603,10 +606,11 @@ HTML;
      *
      * @param array $a
      * @param array $b
+     *
      * @return int
      */
-    protected function compareNodes($a, $b) {
-
+    protected function compareNodes($a, $b)
+    {
         $typeA = (isset($a['{DAV:}resourcetype']))
             ? (in_array('{DAV:}collection', $a['{DAV:}resourcetype']->getValue()))
             : false;
@@ -619,29 +623,30 @@ HTML;
         if ($typeA === $typeB) {
             return strnatcasecmp($a['displayPath'], $b['displayPath']);
         }
-        return (($typeA < $typeB) ? 1 : -1);
 
+        return ($typeA < $typeB) ? 1 : -1;
     }
 
     /**
      * Maps a resource type to a human-readable string and icon.
      *
-     * @param array $resourceTypes
+     * @param array     $resourceTypes
      * @param DAV\INode $node
+     *
      * @return array
      */
-    private function mapResourceType(array $resourceTypes, $node) {
-
+    private function mapResourceType(array $resourceTypes, $node)
+    {
         if (!$resourceTypes) {
             if ($node instanceof DAV\IFile) {
                 return [
                     'string' => 'File',
-                    'icon'   => 'file',
+                    'icon' => 'file',
                 ];
             } else {
                 return [
                     'string' => 'Unknown',
-                    'icon'   => 'cog',
+                    'icon' => 'cog',
                 ];
             }
         }
@@ -649,53 +654,53 @@ HTML;
         $types = [
             '{http://calendarserver.org/ns/}calendar-proxy-write' => [
                 'string' => 'Proxy-Write',
-                'icon'   => 'people',
+                'icon' => 'people',
             ],
             '{http://calendarserver.org/ns/}calendar-proxy-read' => [
                 'string' => 'Proxy-Read',
-                'icon'   => 'people',
+                'icon' => 'people',
             ],
             '{urn:ietf:params:xml:ns:caldav}schedule-outbox' => [
                 'string' => 'Outbox',
-                'icon'   => 'inbox',
+                'icon' => 'inbox',
             ],
             '{urn:ietf:params:xml:ns:caldav}schedule-inbox' => [
                 'string' => 'Inbox',
-                'icon'   => 'inbox',
+                'icon' => 'inbox',
             ],
             '{urn:ietf:params:xml:ns:caldav}calendar' => [
                 'string' => 'Calendar',
-                'icon'   => 'calendar',
+                'icon' => 'calendar',
             ],
             '{http://calendarserver.org/ns/}shared-owner' => [
                 'string' => 'Shared',
-                'icon'   => 'calendar',
+                'icon' => 'calendar',
             ],
             '{http://calendarserver.org/ns/}subscribed' => [
                 'string' => 'Subscription',
-                'icon'   => 'calendar',
+                'icon' => 'calendar',
             ],
             '{urn:ietf:params:xml:ns:carddav}directory' => [
                 'string' => 'Directory',
-                'icon'   => 'globe',
+                'icon' => 'globe',
             ],
             '{urn:ietf:params:xml:ns:carddav}addressbook' => [
                 'string' => 'Address book',
-                'icon'   => 'book',
+                'icon' => 'book',
             ],
             '{DAV:}principal' => [
                 'string' => 'Principal',
-                'icon'   => 'person',
+                'icon' => 'person',
             ],
             '{DAV:}collection' => [
                 'string' => 'Collection',
-                'icon'   => 'folder',
+                'icon' => 'folder',
             ],
         ];
 
         $info = [
             'string' => [],
-            'icon'   => 'cog',
+            'icon' => 'cog',
         ];
         foreach ($resourceTypes as $k => $resourceType) {
             if (isset($types[$resourceType])) {
@@ -713,42 +718,41 @@ HTML;
         $info['string'] = implode(', ', $info['string']);
 
         return $info;
-
     }
 
     /**
-     * Draws a table row for a property
+     * Draws a table row for a property.
      *
      * @param string $name
-     * @param mixed $value
+     * @param mixed  $value
+     *
      * @return string
      */
-    private function drawPropertyRow($name, $value) {
-
+    private function drawPropertyRow($name, $value)
+    {
         $html = new HtmlOutputHelper(
             $this->server->getBaseUri(),
             $this->server->xml->namespaceMap
         );
 
-        return "<tr><th>" . $html->xmlName($name) . "</th><td>" . $this->drawPropertyValue($html, $value) . "</td></tr>";
-
+        return '<tr><th>'.$html->xmlName($name).'</th><td>'.$this->drawPropertyValue($html, $value).'</td></tr>';
     }
 
     /**
-     * Draws a table row for a property
+     * Draws a table row for a property.
      *
      * @param HtmlOutputHelper $html
-     * @param mixed $value
+     * @param mixed            $value
+     *
      * @return string
      */
-    private function drawPropertyValue($html, $value) {
-
+    private function drawPropertyValue($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());
@@ -756,12 +760,11 @@ HTML;
             // element.
             $xml = explode("\n", $xml);
             $xml = array_slice($xml, 2, -2);
-            return "<pre>" . $html->h(implode("\n", $xml)) . "</pre>";
 
+            return '<pre>'.$html->h(implode("\n", $xml)).'</pre>';
         } else {
-            return "<em>unknown</em>";
+            return '<em>unknown</em>';
         }
-
     }
 
     /**
@@ -772,10 +775,9 @@ HTML;
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'browser';
-
     }
 
     /**
@@ -789,14 +791,12 @@ HTML;
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Generates HTML indexes and debug information for your sabre/dav server',
-            'link'        => 'http://sabre.io/dav/browser-plugin/',
+            '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
index c14b7f2f9..34702bdd8 100644
--- a/vendor/sabre/dav/lib/DAV/Browser/PropFindAll.php
+++ b/vendor/sabre/dav/lib/DAV/Browser/PropFindAll.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Browser;
 
 use Sabre\DAV\PropFind;
@@ -12,17 +14,16 @@ use Sabre\DAV\PropFind;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PropFindAll extends PropFind {
-
+class PropFindAll extends PropFind
+{
     /**
-     * Creates the PROPFIND object
+     * Creates the PROPFIND object.
      *
      * @param string $path
      */
-    function __construct($path) {
-
+    public function __construct($path)
+    {
         parent::__construct($path, []);
-
     }
 
     /**
@@ -44,11 +45,10 @@ class PropFindAll extends PropFind {
      * It's also possible to not pass a callback, but immediately pass a value
      *
      * @param string $propertyName
-     * @param mixed $valueOrCallBack
-     * @return void
+     * @param mixed  $valueOrCallBack
      */
-    function handle($propertyName, $valueOrCallBack) {
-
+    public function handle($propertyName, $valueOrCallBack)
+    {
         if (is_callable($valueOrCallBack)) {
             $value = $valueOrCallBack();
         } else {
@@ -57,39 +57,36 @@ class PropFindAll extends PropFind {
         if (!is_null($value)) {
             $this->result[$propertyName] = [200, $value];
         }
-
     }
 
     /**
-     * Sets the value of the property
+     * 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
+     * @param mixed  $value
+     * @param int    $status
      */
-    function set($propertyName, $value, $status = null) {
-
+    public function set($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) {
-
+    public function get($propertyName)
+    {
         return isset($this->result[$propertyName]) ? $this->result[$propertyName][1] : null;
-
     }
 
     /**
@@ -99,12 +96,12 @@ class PropFindAll extends PropFind {
      * null will be returned.
      *
      * @param string $propertyName
+     *
      * @return int|null
      */
-    function getStatus($propertyName) {
-
+    public function getStatus($propertyName)
+    {
         return isset($this->result[$propertyName]) ? $this->result[$propertyName][0] : 404;
-
     }
 
     /**
@@ -113,11 +110,11 @@ class PropFindAll extends PropFind {
      *
      * @return array
      */
-    function get404Properties() {
-
+    public function get404Properties()
+    {
         $result = [];
         foreach ($this->result as $propertyName => $stuff) {
-            if ($stuff[0] === 404) {
+            if (404 === $stuff[0]) {
                 $result[] = $propertyName;
             }
         }
@@ -125,8 +122,7 @@ class PropFindAll extends PropFind {
         if (!$result) {
             $result[] = '{http://sabredav.org/ns}idk';
         }
-        return $result;
 
+        return $result;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Client.php b/vendor/sabre/dav/lib/DAV/Client.php
index 175ad1bc4..cfa24cd29 100644
--- a/vendor/sabre/dav/lib/DAV/Client.php
+++ b/vendor/sabre/dav/lib/DAV/Client.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 use Sabre\HTTP;
 use Sabre\Uri;
 
 /**
- * SabreDAV DAV client
+ * SabreDAV DAV client.
  *
  * This client wraps around Curl to provide a convenient API to a WebDAV
  * server.
@@ -17,8 +19,8 @@ use Sabre\Uri;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Client extends HTTP\Client {
-
+class Client extends HTTP\Client
+{
     /**
      * The xml service.
      *
@@ -29,18 +31,19 @@ class Client extends HTTP\Client {
     public $xml;
 
     /**
-     * The elementMap
+     * 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
+     * Base URI.
      *
      * This URI will be used to resolve relative urls.
      *
@@ -49,17 +52,17 @@ class Client extends HTTP\Client {
     protected $baseUri;
 
     /**
-     * Basic authentication
+     * Basic authentication.
      */
     const AUTH_BASIC = 1;
 
     /**
-     * Digest authentication
+     * Digest authentication.
      */
     const AUTH_DIGEST = 2;
 
     /**
-     * NTLM authentication
+     * NTLM authentication.
      */
     const AUTH_NTLM = 4;
 
@@ -69,12 +72,12 @@ class Client extends HTTP\Client {
     const ENCODING_IDENTITY = 1;
 
     /**
-     * Deflate encoding
+     * Deflate encoding.
      */
     const ENCODING_DEFLATE = 2;
 
     /**
-     * Gzip encoding
+     * Gzip encoding.
      */
     const ENCODING_GZIP = 4;
 
@@ -84,14 +87,14 @@ class Client extends HTTP\Client {
     const ENCODING_ALL = 7;
 
     /**
-     * Content-encoding
+     * Content-encoding.
      *
      * @var int
      */
     protected $encoding = self::ENCODING_IDENTITY;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * Settings are provided through the 'settings' argument. The following
      * settings are supported:
@@ -112,8 +115,8 @@ class Client extends HTTP\Client {
      *
      * @param array $settings
      */
-    function __construct(array $settings) {
-
+    public function __construct(array $settings)
+    {
         if (!isset($settings['baseUri'])) {
             throw new \InvalidArgumentException('A baseUri must be provided');
         }
@@ -146,8 +149,7 @@ class Client extends HTTP\Client {
             }
 
             $this->addCurlSetting(CURLOPT_HTTPAUTH, $curlType);
-            $this->addCurlSetting(CURLOPT_USERPWD, $userName . ':' . $password);
-
+            $this->addCurlSetting(CURLOPT_USERPWD, $userName.':'.$password);
         }
 
         if (isset($settings['encoding'])) {
@@ -166,16 +168,15 @@ class Client extends HTTP\Client {
             $this->addCurlSetting(CURLOPT_ENCODING, implode(',', $encodings));
         }
 
-        $this->addCurlSetting(CURLOPT_USERAGENT, 'sabre-dav/' . Version::VERSION . ' (http://sabre.io/)');
+        $this->addCurlSetting(CURLOPT_USERAGENT, 'sabre-dav/'.Version::VERSION.' (http://sabre.io/)');
 
         $this->xml = new Xml\Service();
         // BC
-        $this->propertyMap = & $this->xml->elementMap;
-
+        $this->propertyMap = &$this->xml->elementMap;
     }
 
     /**
-     * Does a PROPFIND request
+     * Does a PROPFIND request.
      *
      * The list of requested properties must be specified as an array, in clark
      * notation.
@@ -191,28 +192,28 @@ class Client extends HTTP\Client {
      * made to the server to also return all child resources.
      *
      * @param string $url
-     * @param array $properties
-     * @param int $depth
+     * @param array  $properties
+     * @param int    $depth
+     *
      * @return array
      */
-    function propFind($url, array $properties, $depth = 0) {
-
+    public function propFind($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);
+            if ('DAV:' === $namespace) {
+                $element = $dom->createElement('d:'.$elementName);
             } else {
-                $element = $dom->createElementNS($namespace, 'x:' . $elementName);
+                $element = $dom->createElementNS($namespace, 'x:'.$elementName);
             }
 
             $prop->appendChild($element);
@@ -224,49 +225,48 @@ class Client extends HTTP\Client {
         $url = $this->getAbsoluteUrl($url);
 
         $request = new HTTP\Request('PROPFIND', $url, [
-            'Depth'        => $depth,
-            'Content-Type' => 'application/xml'
+            'Depth' => $depth,
+            'Content-Type' => 'application/xml',
         ], $body);
 
         $response = $this->send($request);
 
-        if ((int)$response->getStatus() >= 400) {
+        if ((int) $response->getStatus() >= 400) {
             throw new HTTP\ClientHttpException($response);
         }
 
         $result = $this->parseMultiStatus($response->getBodyAsString());
 
         // If depth was 0, we only return the top item
-        if ($depth === 0) {
+        if (0 === $depth) {
             reset($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
+     * 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
+     * @param array  $properties
+     *
      * @return bool
      */
-    function propPatch($url, array $properties) {
-
+    public function propPatch($url, array $properties)
+    {
         $propPatch = new Xml\Request\PropPatch();
         $propPatch->properties = $properties;
         $xml = $this->xml->write(
@@ -284,7 +284,7 @@ class Client extends HTTP\Client {
             throw new HTTP\ClientHttpException($response);
         }
 
-        if ($response->getStatus() === 207) {
+        if (207 === $response->getStatus()) {
             // 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());
@@ -292,26 +292,23 @@ class Client extends HTTP\Client {
             $errorProperties = [];
             foreach ($result as $href => $statusList) {
                 foreach ($statusList as $status => $properties) {
-
                     if ($status >= 400) {
                         foreach ($properties as $propName => $propValue) {
-                            $errorProperties[] = $propName . ' (' . $status . ')';
+                            $errorProperties[] = $propName.' ('.$status.')';
                         }
                     }
-
                 }
             }
             if ($errorProperties) {
-
-                throw new HTTP\ClientException('PROPPATCH failed. The following properties errored: ' . implode(', ', $errorProperties));
+                throw new HTTP\ClientException('PROPPATCH failed. The following properties errored: '.implode(', ', $errorProperties));
             }
         }
-        return true;
 
+        return true;
     }
 
     /**
-     * Performs an HTTP options request
+     * 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
@@ -319,8 +316,8 @@ class Client extends HTTP\Client {
      *
      * @return array
      */
-    function options() {
-
+    public function options()
+    {
         $request = new HTTP\Request('OPTIONS', $this->getAbsoluteUrl(''));
         $response = $this->send($request);
 
@@ -333,8 +330,8 @@ class Client extends HTTP\Client {
         foreach ($features as &$v) {
             $v = trim($v);
         }
-        return $features;
 
+        return $features;
     }
 
     /**
@@ -359,24 +356,26 @@ class Client extends HTTP\Client {
      * Note that it is no longer recommended to use this method, use the send()
      * method instead.
      *
-     * @param string $method
-     * @param string $url
+     * @param string               $method
+     * @param string               $url
      * @param string|resource|null $body
-     * @param array $headers
-     * @throws ClientException, in case a curl error occurred.
+     * @param array                $headers
+     *
+     * @throws clientException, in case a curl error occurred
+     *
      * @return array
      */
-    function request($method, $url = '', $body = null, array $headers = []) {
-
+    public function request($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()),
+            'body' => $response->getBodyAsString(),
+            'statusCode' => (int) $response->getStatus(),
+            'headers' => array_change_key_case($response->getHeaders()),
         ];
-
     }
 
     /**
@@ -384,19 +383,19 @@ class Client extends HTTP\Client {
      * urls are expanded based on the base url as given by the server.
      *
      * @param string $url
+     *
      * @return string
      */
-    function getAbsoluteUrl($url) {
-
+    public function getAbsoluteUrl($url)
+    {
         return Uri\resolve(
             $this->baseUri,
             $url
         );
-
     }
 
     /**
-     * Parses a WebDAV multistatus response body
+     * Parses a WebDAV multistatus response body.
      *
      * This method returns an array with the following structure
      *
@@ -418,22 +417,19 @@ class Client extends HTTP\Client {
      *
      *
      * @param string $body xml body
+     *
      * @return array
      */
-    function parseMultiStatus($body) {
-
+    public 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/DAV/Collection.php b/vendor/sabre/dav/lib/DAV/Collection.php
index 35c90b5af..2728bb27e 100644
--- a/vendor/sabre/dav/lib/DAV/Collection.php
+++ b/vendor/sabre/dav/lib/DAV/Collection.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * Collection class
+ * Collection class.
  *
  * This is a helper class, that should aid in getting collections classes setup.
  * Most of its methods are implemented, and throw permission denied exceptions
@@ -12,8 +14,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class Collection extends Node implements ICollection {
-
+abstract class Collection extends Node implements ICollection
+{
     /**
      * Returns a child object, by its name.
      *
@@ -25,18 +27,19 @@ abstract class Collection extends Node implements ICollection {
      * exist.
      *
      * @param string $name
+     *
      * @throws Exception\NotFound
+     *
      * @return INode
      */
-    function getChild($name) {
-
+    public function getChild($name)
+    {
         foreach ($this->getChildren() as $child) {
-
-            if ($child->getName() === $name) return $child;
-
+            if ($child->getName() === $name) {
+                return $child;
+            }
         }
-        throw new Exception\NotFound('File not found: ' . $name);
-
+        throw new Exception\NotFound('File not found: '.$name);
     }
 
     /**
@@ -45,25 +48,22 @@ abstract class Collection extends Node implements ICollection {
      * It is generally a good idea to try and override this. Usually it can be optimized.
      *
      * @param string $name
+     *
      * @return bool
      */
-    function childExists($name) {
-
+    public function childExists($name)
+    {
         try {
-
             $this->getChild($name);
-            return true;
 
+            return true;
         } catch (Exception\NotFound $e) {
-
             return false;
-
         }
-
     }
 
     /**
-     * Creates a new file in the directory
+     * 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.
@@ -82,28 +82,25 @@ abstract class Collection extends Node implements ICollection {
      * 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 string          $name Name of the file
      * @param resource|string $data Initial payload
-     * @return null|string
+     *
+     * @return string|null
      */
-    function createFile($name, $data = null) {
-
-        throw new Exception\Forbidden('Permission denied to create file (filename ' . $name . ')');
-
+    public function createFile($name, $data = null)
+    {
+        throw new Exception\Forbidden('Permission denied to create file (filename '.$name.')');
     }
 
     /**
-     * Creates a new subdirectory
+     * Creates a new subdirectory.
      *
      * @param string $name
+     *
      * @throws Exception\Forbidden
-     * @return void
      */
-    function createDirectory($name) {
-
+    public function createDirectory($name)
+    {
         throw new Exception\Forbidden('Permission denied to create directory');
-
     }
-
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/CorePlugin.php b/vendor/sabre/dav/lib/DAV/CorePlugin.php
index 676cdd04a..ef1dfceb6 100644
--- a/vendor/sabre/dav/lib/DAV/CorePlugin.php
+++ b/vendor/sabre/dav/lib/DAV/CorePlugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 use Sabre\DAV\Exception\BadRequest;
@@ -14,8 +16,8 @@ use Sabre\Xml\ParseException;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CorePlugin extends ServerPlugin {
-
+class CorePlugin extends ServerPlugin
+{
     /**
      * Reference to server object.
      *
@@ -24,34 +26,32 @@ class CorePlugin extends ServerPlugin {
     protected $server;
 
     /**
-     * Sets up the plugin
+     * Sets up the plugin.
      *
      * @param Server $server
-     * @return void
      */
-    function initialize(Server $server) {
-
+    public 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']);
+        $server->on('method:GET', [$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);
-
-        $server->on('exception',        [$this, 'exception']);
-
+        $server->on('method:PUT', [$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);
+
+        $server->on('exception', [$this, 'exception']);
     }
 
     /**
@@ -62,34 +62,40 @@ class CorePlugin extends ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'core';
-
     }
 
     /**
      * This is the default implementation for the GET method.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpGet(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpGet(RequestInterface $request, ResponseInterface $response)
+    {
         $path = $request->getPath();
         $node = $this->server->tree->getNodeForPath($path);
 
-        if (!$node instanceof IFile) return;
-
-        $body = $node->get();
+        if (!$node instanceof IFile) {
+            return;
+        }
 
-        // Converting string into stream, if needed.
-        if (is_string($body)) {
-            $stream = fopen('php://temp', 'r+');
-            fwrite($stream, $body);
-            rewind($stream);
-            $body = $stream;
+        if ('HEAD' === $request->getHeader('X-Sabre-Original-Method')) {
+            $body = '';
+        } else {
+            $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;
+            }
         }
 
         /*
@@ -105,14 +111,11 @@ class CorePlugin extends ServerPlugin {
             $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 {
             $nodeSize = null;
         }
@@ -126,7 +129,6 @@ class CorePlugin extends ServerPlugin {
         // If ifRange is set, and range is specified, we first need to check
         // the precondition.
         if ($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 {
@@ -134,81 +136,87 @@ class CorePlugin extends ServerPlugin {
 
                 // It's a date. We must check if the entity is modified since
                 // the specified date.
-                if (!isset($httpHeaders['Last-Modified'])) $ignoreRangeHeader = true;
-                else {
+                if (!isset($httpHeaders['Last-Modified'])) {
+                    $ignoreRangeHeader = true;
+                } else {
                     $modified = new \DateTime($httpHeaders['Last-Modified']);
-                    if ($modified > $ifRangeDate) $ignoreRangeHeader = true;
+                    if ($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) $ignoreRangeHeader = true;
+                if (!isset($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 = $nodeSize - 1;
-
+                if ($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) $start = 0;
-
+                if ($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, $start, SEEK_SET) === -1) {
+            if (!stream_get_meta_data($body)['seekable'] || -1 === fseek($body, $start, SEEK_SET)) {
                 $consumeBlock = 8192;
-                for ($consumed = 0; $start - $consumed > 0;){
-                    if (feof($body)) throw new Exception\RequestedRangeNotSatisfiable('The start offset (' . $start . ') exceeded the size of the entity (' . $consumed . ')');
+                for ($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);
+            $response->setHeader('Content-Range', 'bytes '.$start.'-'.$end.'/'.$nodeSize);
             $response->setStatus(206);
             $response->setBody($body);
-
         } else {
-
-            if ($nodeSize) $response->setHeader('Content-Length', $nodeSize);
+            if ($nodeSize) {
+                $response->setHeader('Content-Length', $nodeSize);
+            }
             $response->setStatus(200);
             $response->setBody($body);
-
         }
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
     /**
-     * HTTP OPTIONS
+     * HTTP OPTIONS.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpOptions(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpOptions(RequestInterface $request, ResponseInterface $response)
+    {
         $methods = $this->server->getAllowedMethods($request->getPath());
 
         $response->setHeader('Allow', strtoupper(implode(', ', $methods)));
@@ -227,31 +235,31 @@ class CorePlugin extends ServerPlugin {
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
     /**
-     * HTTP HEAD
+     * 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 RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpHead(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpHead(RequestInterface $request, ResponseInterface $response)
+    {
         // This is implemented by changing the HEAD request to a GET request,
-        // and dropping the response body.
+        // and telling the request handler that is doesn't need to create the body.
         $subRequest = clone $request;
         $subRequest->setMethod('GET');
+        $subRequest->setHeader('X-Sabre-Original-Method', 'HEAD');
 
         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,
@@ -267,23 +275,23 @@ class CorePlugin extends ServerPlugin {
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
     /**
-     * HTTP Delete
+     * HTTP Delete.
      *
      * The HTTP delete method, deletes a given uri
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function httpDelete(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpDelete(RequestInterface $request, ResponseInterface $response)
+    {
         $path = $request->getPath();
 
-        if (!$this->server->emit('beforeUnbind', [$path])) return false;
+        if (!$this->server->emit('beforeUnbind', [$path])) {
+            return false;
+        }
         $this->server->tree->delete($path);
         $this->server->emit('afterUnbind', [$path]);
 
@@ -293,11 +301,10 @@ class CorePlugin extends ServerPlugin {
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
     /**
-     * WebDAV PROPFIND
+     * 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
@@ -308,12 +315,11 @@ class CorePlugin extends ServerPlugin {
      *
      * It has to return a HTTP 207 Multi-status status code
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function httpPropFind(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpPropFind(RequestInterface $request, ResponseInterface $response)
+    {
         $path = $request->getPath();
 
         $requestBody = $request->getBodyAsString();
@@ -321,7 +327,7 @@ class CorePlugin extends ServerPlugin {
             try {
                 $propFindXml = $this->server->xml->expect('{DAV:}propfind', $requestBody);
             } catch (ParseException $e) {
-                throw new BadRequest($e->getMessage(), null, $e);
+                throw new BadRequest($e->getMessage(), 0, $e);
             }
         } else {
             $propFindXml = new Xml\Request\PropFind();
@@ -331,7 +337,9 @@ class CorePlugin extends ServerPlugin {
 
         $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) $depth = 1;
+        if (!$this->server->enablePropfindDepthInfinity && 0 != $depth) {
+            $depth = 1;
+        }
 
         $newProperties = $this->server->getPropertiesIteratorForPath($path, $propFindXml->properties, $depth);
 
@@ -350,7 +358,7 @@ class CorePlugin extends ServerPlugin {
         $response->setHeader('DAV', implode(', ', $features));
 
         $prefer = $this->server->getHTTPPrefer();
-        $minimal = $prefer['return'] === 'minimal';
+        $minimal = 'minimal' === $prefer['return'];
 
         $data = $this->server->generateMultiStatus($newProperties, $minimal);
         $response->setBody($data);
@@ -358,27 +366,27 @@ class CorePlugin extends ServerPlugin {
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
     /**
-     * WebDAV PROPPATCH
+     * 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 RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpPropPatch(RequestInterface $request, ResponseInterface $response) {
-
+    public 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, $e);
+            throw new BadRequest($e->getMessage(), 0, $e);
         }
         $newProperties = $propPatch->properties;
 
@@ -387,31 +395,27 @@ class CorePlugin extends ServerPlugin {
         $prefer = $this->server->getHTTPPrefer();
         $response->setHeader('Vary', 'Brief,Prefer');
 
-        if ($prefer['return'] === 'minimal') {
-
+        if ('minimal' === $prefer['return']) {
             // If return-minimal is specified, we only have to check if the
             // request was successful, and don't need to return the
             // multi-status.
             $ok = true;
             foreach ($result as $prop => $code) {
-                if ((int)$code > 299) {
+                if ((int) $code > 299) {
                     $ok = false;
                 }
             }
 
             if ($ok) {
-
                 $response->setStatus(204);
-                return false;
 
+                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) {
@@ -430,22 +434,22 @@ class CorePlugin extends ServerPlugin {
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
     /**
-     * HTTP PUT method
+     * 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 RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpPut(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpPut(RequestInterface $request, ResponseInterface $response)
+    {
         $body = $request->getBodyAsStream();
         $path = $request->getPath();
 
@@ -463,7 +467,6 @@ class CorePlugin extends ServerPlugin {
 
         // 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.
@@ -487,7 +490,7 @@ class CorePlugin extends ServerPlugin {
 
             // Only reading first byte
             $firstByte = fread($body, 1);
-            if (strlen($firstByte) !== 1) {
+            if (1 !== strlen($firstByte)) {
                 throw new Exception\Forbidden('This server is not compatible with OS/X finder. Consider using a different WebDAV client or webserver.');
             }
 
@@ -500,26 +503,25 @@ class CorePlugin extends ServerPlugin {
             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 (!($node instanceof IFile)) throw new Exception\Conflict('PUT is not allowed on non-files.');
-
+            if (!($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', $etag);
+            if ($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)) {
@@ -528,61 +530,55 @@ class CorePlugin extends ServerPlugin {
             }
 
             $response->setHeader('Content-Length', '0');
-            if ($etag) $response->setHeader('ETag', $etag);
+            if ($etag) {
+                $response->setHeader('ETag', $etag);
+            }
             $response->setStatus(201);
-
         }
 
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
-
     /**
-     * WebDAV MKCOL
+     * WebDAV MKCOL.
      *
      * The MKCOL method is used to create a new collection (directory) on the server
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpMkcol(RequestInterface $request, ResponseInterface $response) {
-
+    public 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) {
-
+            if (null === $contentType || (0 !== strpos($contentType, 'application/xml') && 0 !== strpos($contentType, 'text/xml'))) {
                 // 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, $e);
+                throw new Exception\BadRequest($e->getMessage(), 0, $e);
             }
 
             $properties = $mkcol->getProperties();
 
-            if (!isset($properties['{DAV:}resourcetype']))
+            if (!isset($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);
@@ -596,7 +592,6 @@ class CorePlugin extends ServerPlugin {
             $response->setBody(
                 $this->server->generateMultiStatus([$result])
             );
-
         } else {
             $response->setHeader('Content-Length', '0');
             $response->setStatus(201);
@@ -605,38 +600,42 @@ class CorePlugin extends ServerPlugin {
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
     /**
-     * WebDAV HTTP MOVE method
+     * 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 RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpMove(RequestInterface $request, ResponseInterface $response) {
-
+    public 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', [$moveInfo['destination']])) {
+                return false;
+            }
+        }
+        if (!$this->server->emit('beforeUnbind', [$path])) {
+            return false;
+        }
+        if (!$this->server->emit('beforeBind', [$moveInfo['destination']])) {
+            return false;
+        }
+        if (!$this->server->emit('beforeMove', [$path, $moveInfo['destination']])) {
+            return false;
         }
-        if (!$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']);
@@ -656,28 +655,32 @@ class CorePlugin extends ServerPlugin {
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
     /**
-     * WebDAV HTTP COPY method
+     * 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 RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpCopy(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpCopy(RequestInterface $request, ResponseInterface $response)
+    {
         $path = $request->getPath();
 
         $copyInfo = $this->server->getCopyAndMoveInfo($request);
 
-        if (!$this->server->emit('beforeBind', [$copyInfo['destination']])) return false;
+        if (!$this->server->emit('beforeBind', [$copyInfo['destination']])) {
+            return false;
+        }
         if ($copyInfo['destinationExists']) {
-            if (!$this->server->emit('beforeUnbind', [$copyInfo['destination']])) return false;
+            if (!$this->server->emit('beforeUnbind', [$copyInfo['destination']])) {
+                return false;
+            }
             $this->server->tree->delete($copyInfo['destination']);
         }
 
@@ -691,22 +694,21 @@ class CorePlugin extends ServerPlugin {
         // Sending back false will interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
-
     }
 
     /**
-     * HTTP REPORT method implementation
+     * 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 RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpReport(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpReport(RequestInterface $request, ResponseInterface $response)
+    {
         $path = $request->getPath();
 
         $result = $this->server->xml->parse(
@@ -716,16 +718,13 @@ class CorePlugin extends ServerPlugin {
         );
 
         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 interrupt the event chain and tell the server
         // we've handled this method.
         return false;
-
     }
 
     /**
@@ -734,12 +733,11 @@ class CorePlugin extends ServerPlugin {
      * 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 string    $path
      * @param PropPatch $propPatch
-     * @return void
      */
-    function propPatchProtectedPropertyCheck($path, PropPatch $propPatch) {
-
+    public function propPatchProtectedPropertyCheck($path, PropPatch $propPatch)
+    {
         // Comparing the mutation list to the list of protected properties.
         $mutations = $propPatch->getMutations();
 
@@ -751,7 +749,6 @@ class CorePlugin extends ServerPlugin {
         if ($protected) {
             $propPatch->setResultCode($protected, 403);
         }
-
     }
 
     /**
@@ -760,19 +757,17 @@ class CorePlugin extends ServerPlugin {
      * Here we check if a node implements IProperties and let the node handle
      * updating of (some) properties.
      *
-     * @param string $path
+     * @param string    $path
      * @param PropPatch $propPatch
-     * @return void
      */
-    function propPatchNodeUpdate($path, PropPatch $propPatch) {
-
+    public function propPatchNodeUpdate($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);
         }
-
     }
 
     /**
@@ -781,12 +776,11 @@ class CorePlugin extends ServerPlugin {
      * Here we add all the default properties.
      *
      * @param PropFind $propFind
-     * @param INode $node
-     * @return void
+     * @param INode    $node
      */
-    function propFind(PropFind $propFind, INode $node) {
-
-        $propFind->handle('{DAV:}getlastmodified', function() use ($node) {
+    public function propFind(PropFind $propFind, INode $node)
+    {
+        $propFind->handle('{DAV:}getlastmodified', function () use ($node) {
             $lm = $node->getLastModified();
             if ($lm) {
                 return new Xml\Property\GetLastModified($lm);
@@ -801,34 +795,36 @@ class CorePlugin extends ServerPlugin {
 
         if ($node instanceof IQuota) {
             $quotaInfo = null;
-            $propFind->handle('{DAV:}quota-used-bytes', function() use (&$quotaInfo, $node) {
+            $propFind->handle('{DAV:}quota-used-bytes', function () use (&$quotaInfo, $node) {
                 $quotaInfo = $node->getQuotaInfo();
+
                 return $quotaInfo[0];
             });
-            $propFind->handle('{DAV:}quota-available-bytes', function() use (&$quotaInfo, $node) {
+            $propFind->handle('{DAV:}quota-available-bytes', function () use (&$quotaInfo, $node) {
                 if (!$quotaInfo) {
                     $quotaInfo = $node->getQuotaInfo();
                 }
+
                 return $quotaInfo[1];
             });
         }
 
-        $propFind->handle('{DAV:}supported-report-set', function() use ($propFind) {
+        $propFind->handle('{DAV:}supported-report-set', function () use ($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) {
+        $propFind->handle('{DAV:}resourcetype', function () use ($node) {
             return new Xml\Property\ResourceType($this->server->getResourceTypeForNode($node));
         });
-        $propFind->handle('{DAV:}supported-method-set', function() use ($propFind) {
+        $propFind->handle('{DAV:}supported-method-set', function () use ($propFind) {
             return new Xml\Property\SupportedMethodSet(
                 $this->server->getAllowedMethods($propFind->getPath())
             );
         });
-
     }
 
     /**
@@ -838,20 +834,16 @@ class CorePlugin extends ServerPlugin {
      * populate the result.
      *
      * @param PropFind $propFind
-     * @param INode $node
-     * @return void
+     * @param INode    $node
      */
-    function propFindNode(PropFind $propFind, INode $node) {
-
+    public function propFindNode(PropFind $propFind, INode $node)
+    {
         if ($node instanceof IProperties && $propertyNames = $propFind->get404Properties()) {
-
             $nodeProperties = $node->getProperties($propertyNames);
             foreach ($nodeProperties as $propertyName => $propertyValue) {
                 $propFind->set($propertyName, $propertyValue, 200);
             }
-
         }
-
     }
 
     /**
@@ -861,17 +853,17 @@ class CorePlugin extends ServerPlugin {
      * want other systems to first have a chance to handle the properties.
      *
      * @param PropFind $propFind
-     * @param INode $node
-     * @return void
+     * @param INode    $node
      */
-    function propFindLate(PropFind $propFind, INode $node) {
-
-        $propFind->handle('{http://calendarserver.org/ns/}getctag', function() use ($propFind) {
-
+    public 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 $val;
+            if ($val) {
+                return $val;
+            }
 
             $val = $propFind->get('{DAV:}sync-token');
             if ($val && is_scalar($val)) {
@@ -899,9 +891,7 @@ class CorePlugin extends ServerPlugin {
                     return substr($val->getHref(), strlen(Sync\Plugin::SYNCTOKEN_PREFIX));
                 }
             }
-
         });
-
     }
 
     /**
@@ -909,8 +899,8 @@ class CorePlugin extends ServerPlugin {
      *
      * @param Exception $e
      */
-    function exception($e) {
-
+    public function exception($e)
+    {
         $logLevel = \Psr\Log\LogLevel::CRITICAL;
         if ($e instanceof \Sabre\DAV\Exception) {
             // If it's a standard sabre/dav exception, it means we have a http
@@ -947,13 +937,12 @@ class CorePlugin extends ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            '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,
+            'link' => null,
         ];
-
     }
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception.php b/vendor/sabre/dav/lib/DAV/Exception.php
index 14f5bab2a..e1d990623 100644
--- a/vendor/sabre/dav/lib/DAV/Exception.php
+++ b/vendor/sabre/dav/lib/DAV/Exception.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
@@ -15,29 +17,26 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Exception extends \Exception {
-
+class Exception extends \Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 500;
-
     }
 
     /**
-     * This method allows the exception to include additional information into the WebDAV error response
+     * This method allows the exception to include additional information into the WebDAV error response.
      *
-     * @param Server $server
+     * @param Server      $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(Server $server, \DOMElement $errorNode) {
-
-
+    public function serialize(Server $server, \DOMElement $errorNode)
+    {
     }
 
     /**
@@ -46,12 +45,11 @@ class Exception extends \Exception {
      * The headers must be returned as an array.
      *
      * @param Server $server
+     *
      * @return array
      */
-    function getHTTPHeaders(Server $server) {
-
+    public function getHTTPHeaders(Server $server)
+    {
         return [];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/BadRequest.php b/vendor/sabre/dav/lib/DAV/Exception/BadRequest.php
index c21f493da..569c63ba0 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/BadRequest.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/BadRequest.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * BadRequest
+ * BadRequest.
  *
  * The BadRequest is thrown when the user submitted an invalid HTTP request
  * BadRequest
@@ -14,17 +16,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class BadRequest extends DAV\Exception {
-
+class BadRequest extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 400;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/Conflict.php b/vendor/sabre/dav/lib/DAV/Exception/Conflict.php
index 4190e6082..2ec227feb 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/Conflict.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/Conflict.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * Conflict
+ * 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.
@@ -14,17 +16,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Conflict extends DAV\Exception {
-
+class Conflict extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 409;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/ConflictingLock.php b/vendor/sabre/dav/lib/DAV/Exception/ConflictingLock.php
index b2d2746c5..c1a4914ed 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/ConflictingLock.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/ConflictingLock.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * ConflictingLock
+ * ConflictingLock.
  *
  * Similar to  the Locked exception, this exception thrown when a LOCK request
  * was made, on a resource which was already locked
@@ -14,23 +16,20 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ConflictingLock extends Locked {
-
+class ConflictingLock extends Locked
+{
     /**
-     * This method allows the exception to include additional information into the WebDAV error response
+     * This method allows the exception to include additional information into the WebDAV error response.
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         if ($this->lock) {
             $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:no-conflicting-lock');
             $errorNode->appendChild($error);
             $error->appendChild($errorNode->ownerDocument->createElementNS('DAV:', 'd:href', $this->lock->uri));
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/Forbidden.php b/vendor/sabre/dav/lib/DAV/Exception/Forbidden.php
index 77df7ca9e..2f882c396 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/Forbidden.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/Forbidden.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * Forbidden
+ * Forbidden.
  *
  * This exception is thrown whenever a user tries to do an operation he's not allowed to
  *
@@ -13,17 +15,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Forbidden extends DAV\Exception {
-
+class Forbidden extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 403;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/InsufficientStorage.php b/vendor/sabre/dav/lib/DAV/Exception/InsufficientStorage.php
index 96e1acc50..fe6e1268c 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/InsufficientStorage.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/InsufficientStorage.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * InsufficientStorage
+ * InsufficientStorage.
  *
  * This Exception can be thrown, when for example a harddisk is full or a quota is exceeded
  *
@@ -13,17 +15,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class InsufficientStorage extends DAV\Exception {
-
+class InsufficientStorage extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 507;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/InvalidResourceType.php b/vendor/sabre/dav/lib/DAV/Exception/InvalidResourceType.php
index 6324d9f3a..99baeb8bc 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/InvalidResourceType.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/InvalidResourceType.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 /**
- * InvalidResourceType
+ * InvalidResourceType.
  *
  * This exception is thrown when the user tried to create a new collection, with
  * a special resourcetype value that was not recognized by the server.
@@ -14,20 +16,17 @@ namespace Sabre\DAV\Exception;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class InvalidResourceType extends Forbidden {
-
+class InvalidResourceType extends Forbidden
+{
     /**
-     * This method allows the exception to include additional information into the WebDAV error response
+     * This method allows the exception to include additional information into the WebDAV error response.
      *
      * @param \Sabre\DAV\Server $server
-     * @param \DOMElement $errorNode
-     * @return void
+     * @param \DOMElement       $errorNode
      */
-    function serialize(\Sabre\DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(\Sabre\DAV\Server $server, \DOMElement $errorNode)
+    {
         $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
index 51a253b29..6c5f1c435 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/InvalidSyncToken.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/InvalidSyncToken.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * InvalidSyncToken
+ * InvalidSyncToken.
  *
  * This exception is emited for the {DAV:}valid-sync-token pre-condition, as
  * defined in rfc6578, section 3.2.
@@ -19,20 +21,17 @@ use Sabre\DAV;
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class InvalidSyncToken extends Forbidden {
-
+class InvalidSyncToken extends Forbidden
+{
     /**
-     * This method allows the exception to include additional information into the WebDAV error response
+     * This method allows the exception to include additional information into the WebDAV error response.
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public 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/DAV/Exception/LengthRequired.php b/vendor/sabre/dav/lib/DAV/Exception/LengthRequired.php
index 989718558..9d26fcb10 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/LengthRequired.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/LengthRequired.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * LengthRequired
+ * LengthRequired.
  *
  * This exception is thrown when a request was made that required a
  * Content-Length header, but did not contain one.
@@ -14,17 +16,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class LengthRequired extends DAV\Exception {
-
+class LengthRequired extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 411;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/LockTokenMatchesRequestUri.php b/vendor/sabre/dav/lib/DAV/Exception/LockTokenMatchesRequestUri.php
index 5f8c31868..1c7402384 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/LockTokenMatchesRequestUri.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/LockTokenMatchesRequestUri.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * LockTokenMatchesRequestUri
+ * LockTokenMatchesRequestUri.
  *
  * This exception is thrown by UNLOCK if a supplied lock-token is invalid
  *
@@ -13,29 +15,25 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class LockTokenMatchesRequestUri extends Conflict {
-
+class LockTokenMatchesRequestUri extends Conflict
+{
     /**
-     * Creates the exception
+     * Creates the exception.
      */
-    function __construct() {
-
-        $this->message = 'The locktoken supplied does not match any locks on this entity';
-
+    public function __construct()
+    {
+        parent::__construct('The locktoken supplied does not match any locks on this entity');
     }
 
     /**
-     * This method allows the exception to include additional information into the WebDAV error response
+     * This method allows the exception to include additional information into the WebDAV error response.
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:lock-token-matches-request-uri');
         $errorNode->appendChild($error);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/Locked.php b/vendor/sabre/dav/lib/DAV/Exception/Locked.php
index 8176db46e..632bafc60 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/Locked.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/Locked.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * Locked
+ * Locked.
  *
  * The 423 is thrown when a client tried to access a resource that was locked, without supplying a valid lock token
  *
@@ -13,49 +15,48 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Locked extends DAV\Exception {
-
+class Locked extends DAV\Exception
+{
     /**
-     * Lock information
+     * Lock information.
      *
-     * @var Sabre\DAV\Locks\LockInfo
+     * @var \Sabre\DAV\Locks\LockInfo
      */
     protected $lock;
 
     /**
-     * Creates the exception
+     * Creates the exception.
      *
      * A LockInfo object should be passed if the user should be informed
      * which lock actually has the file locked.
      *
      * @param DAV\Locks\LockInfo $lock
      */
-    function __construct(DAV\Locks\LockInfo $lock = null) {
+    public function __construct(DAV\Locks\LockInfo $lock = null)
+    {
+        parent::__construct();
 
         $this->lock = $lock;
-
     }
 
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 423;
-
     }
 
     /**
-     * This method allows the exception to include additional information into the WebDAV error response
+     * This method allows the exception to include additional information into the WebDAV error response.
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         if ($this->lock) {
             $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:lock-token-submitted');
             $errorNode->appendChild($error);
@@ -66,7 +67,5 @@ class Locked extends DAV\Exception {
                 $href
             );
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/MethodNotAllowed.php b/vendor/sabre/dav/lib/DAV/Exception/MethodNotAllowed.php
index 30c1c2553..a3d9c56f2 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/MethodNotAllowed.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/MethodNotAllowed.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * MethodNotAllowed
+ * MethodNotAllowed.
  *
  * The 405 is thrown when a client tried to create a directory on an already existing directory
  *
@@ -13,17 +15,16 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class MethodNotAllowed extends DAV\Exception {
-
+class MethodNotAllowed extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 405;
-
     }
 
     /**
@@ -32,16 +33,15 @@ class MethodNotAllowed extends DAV\Exception {
      * The headers must be returned as an array.
      *
      * @param \Sabre\DAV\Server $server
+     *
      * @return array
      */
-    function getHTTPHeaders(\Sabre\DAV\Server $server) {
-
+    public function getHTTPHeaders(\Sabre\DAV\Server $server)
+    {
         $methods = $server->getAllowedMethods($server->getRequestUri());
 
         return [
             'Allow' => strtoupper(implode(', ', $methods)),
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/NotAuthenticated.php b/vendor/sabre/dav/lib/DAV/Exception/NotAuthenticated.php
index e69a60c75..0a5ba9b5a 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/NotAuthenticated.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/NotAuthenticated.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * NotAuthenticated
+ * NotAuthenticated.
  *
  * This exception is thrown when the client did not provide valid
  * authentication credentials.
@@ -14,17 +16,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class NotAuthenticated extends DAV\Exception {
-
+class NotAuthenticated extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 401;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/NotFound.php b/vendor/sabre/dav/lib/DAV/Exception/NotFound.php
index b0397446d..9cf837074 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/NotFound.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/NotFound.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * NotFound
+ * NotFound.
  *
  * This Exception is thrown when a Node couldn't be found. It returns HTTP error code 404
  *
@@ -13,17 +15,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class NotFound extends DAV\Exception {
-
+class NotFound extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 404;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/NotImplemented.php b/vendor/sabre/dav/lib/DAV/Exception/NotImplemented.php
index 68f309222..cebb83363 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/NotImplemented.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/NotImplemented.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * NotImplemented
+ * NotImplemented.
  *
  * This exception is thrown when the client tried to call an unsupported HTTP method or other feature
  *
@@ -13,17 +15,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class NotImplemented extends DAV\Exception {
-
+class NotImplemented extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 501;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/PaymentRequired.php b/vendor/sabre/dav/lib/DAV/Exception/PaymentRequired.php
index 43e17344a..d237f906b 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/PaymentRequired.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/PaymentRequired.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * Payment Required
+ * Payment Required.
  *
  * The PaymentRequired exception may be thrown in a case where a user must pay
  * to access a certain resource or operation.
@@ -14,17 +16,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PaymentRequired extends DAV\Exception {
-
+class PaymentRequired extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 402;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/PreconditionFailed.php b/vendor/sabre/dav/lib/DAV/Exception/PreconditionFailed.php
index 550360e5a..20d8a2a30 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/PreconditionFailed.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/PreconditionFailed.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * PreconditionFailed
+ * PreconditionFailed.
  *
  * This exception is normally thrown when a client submitted a conditional request,
  * like for example an If, If-None-Match or If-Match header, which caused the HTTP
@@ -15,8 +17,8 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PreconditionFailed extends DAV\Exception {
-
+class PreconditionFailed extends DAV\Exception
+{
     /**
      * When this exception is thrown, the header-name might be set.
      *
@@ -28,44 +30,39 @@ class PreconditionFailed extends DAV\Exception {
     public $header = null;
 
     /**
-     * Create the exception
+     * Create the exception.
      *
      * @param string $message
      * @param string $header
      */
-    function __construct($message, $header = null) {
-
+    public function __construct($message, $header = null)
+    {
         parent::__construct($message);
         $this->header = $header;
-
     }
 
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 412;
-
     }
 
     /**
-     * This method allows the exception to include additional information into the WebDAV error response
+     * This method allows the exception to include additional information into the WebDAV error response.
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         if ($this->header) {
             $prop = $errorNode->ownerDocument->createElement('s:header');
             $prop->nodeValue = $this->header;
             $errorNode->appendChild($prop);
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/ReportNotSupported.php b/vendor/sabre/dav/lib/DAV/Exception/ReportNotSupported.php
index a83695627..cecfec12d 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/ReportNotSupported.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/ReportNotSupported.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * ReportNotSupported
+ * ReportNotSupported.
  *
  * This exception is thrown when the client requested an unknown report through the REPORT method
  *
@@ -13,20 +15,17 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ReportNotSupported extends UnsupportedMediaType {
-
+class ReportNotSupported extends UnsupportedMediaType
+{
     /**
-     * This method allows the exception to include additional information into the WebDAV error response
+     * This method allows the exception to include additional information into the WebDAV error response.
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         $error = $errorNode->ownerDocument->createElementNS('DAV:', 'd:supported-report');
         $errorNode->appendChild($error);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/RequestedRangeNotSatisfiable.php b/vendor/sabre/dav/lib/DAV/Exception/RequestedRangeNotSatisfiable.php
index c8ccfc062..6ccb5b8c8 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/RequestedRangeNotSatisfiable.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/RequestedRangeNotSatisfiable.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * RequestedRangeNotSatisfiable
+ * RequestedRangeNotSatisfiable.
  *
  * This exception is normally thrown when the user
  * request a range that is out of the entity bounds.
@@ -14,17 +16,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class RequestedRangeNotSatisfiable extends DAV\Exception {
-
+class RequestedRangeNotSatisfiable extends DAV\Exception
+{
     /**
-     * returns the http statuscode for this exception
+     * returns the http statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 416;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/ServiceUnavailable.php b/vendor/sabre/dav/lib/DAV/Exception/ServiceUnavailable.php
index 31df606e2..43c995c9c 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/ServiceUnavailable.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/ServiceUnavailable.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * ServiceUnavailable
+ * ServiceUnavailable.
  *
  * This exception is thrown in case the service
  * is currently not available (e.g. down for maintenance).
@@ -14,17 +16,15 @@ use Sabre\DAV;
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ServiceUnavailable extends DAV\Exception {
-
+class ServiceUnavailable extends DAV\Exception
+{
     /**
-     * Returns the HTTP statuscode for this exception
+     * Returns the HTTP statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 503;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Exception/TooManyMatches.php b/vendor/sabre/dav/lib/DAV/Exception/TooManyMatches.php
index d0f0f84e8..7dbe878b9 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/TooManyMatches.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/TooManyMatches.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * TooManyMatches
+ * TooManyMatches.
  *
  * This exception is emited for the {DAV:}number-of-matches-within-limits
  * post-condition, as defined in rfc6578, section 3.2.
@@ -19,20 +21,17 @@ use Sabre\DAV;
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class TooManyMatches extends Forbidden {
-
+class TooManyMatches extends Forbidden
+{
     /**
-     * This method allows the exception to include additional information into the WebDAV error response
+     * This method allows the exception to include additional information into the WebDAV error response.
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public 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/DAV/Exception/UnsupportedMediaType.php b/vendor/sabre/dav/lib/DAV/Exception/UnsupportedMediaType.php
index f3d92842d..bc9da30da 100644
--- a/vendor/sabre/dav/lib/DAV/Exception/UnsupportedMediaType.php
+++ b/vendor/sabre/dav/lib/DAV/Exception/UnsupportedMediaType.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Exception;
 
 use Sabre\DAV;
 
 /**
- * UnSupportedMediaType
+ * 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
@@ -14,17 +16,15 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class UnsupportedMediaType extends DAV\Exception {
-
+class UnsupportedMediaType extends DAV\Exception
+{
     /**
-     * returns the http statuscode for this exception
+     * returns the http statuscode for this exception.
      *
      * @return int
      */
-    function getHTTPCode() {
-
+    public function getHTTPCode()
+    {
         return 415;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/FS/Directory.php b/vendor/sabre/dav/lib/DAV/FS/Directory.php
index 362f7a411..047692294 100644
--- a/vendor/sabre/dav/lib/DAV/FS/Directory.php
+++ b/vendor/sabre/dav/lib/DAV/FS/Directory.php
@@ -1,20 +1,22 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\FS;
 
 use Sabre\DAV;
 
 /**
- * Directory class
+ * 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 {
-
+class Directory extends Node implements DAV\ICollection, DAV\IQuota
+{
     /**
-     * Creates a new file in the directory
+     * 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.
@@ -33,67 +35,63 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
      * 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 string          $name Name of the file
      * @param resource|string $data Initial payload
-     * @return null|string
+     *
+     * @return string|null
      */
-    function createFile($name, $data = null) {
-
-        $newPath = $this->path . '/' . $name;
+    public function createFile($name, $data = null)
+    {
+        $newPath = $this->path.'/'.$name;
         file_put_contents($newPath, $data);
         clearstatcache(true, $newPath);
-
     }
 
     /**
-     * Creates a new subdirectory
+     * Creates a new subdirectory.
      *
      * @param string $name
-     * @return void
      */
-    function createDirectory($name) {
-
-        $newPath = $this->path . '/' . $name;
+    public function createDirectory($name)
+    {
+        $newPath = $this->path.'/'.$name;
         mkdir($newPath);
         clearstatcache(true, $newPath);
-
     }
 
     /**
-     * Returns a specific child node, referenced by its name
+     * Returns a specific child node, referenced by its name.
      *
      * This method must throw 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 with name ' . $path . ' could not be located');
+    public function getChild($name)
+    {
+        $path = $this->path.'/'.$name;
 
+        if (!file_exists($path)) {
+            throw new DAV\Exception\NotFound('File with name '.$path.' could not be located');
+        }
         if (is_dir($path)) {
-
             return new self($path);
-
         } else {
-
             return new File($path);
-
         }
-
     }
 
     /**
-     * Returns an array with all the child nodes
+     * Returns an array with all the child nodes.
      *
      * @return DAV\INode[]
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         $nodes = [];
         $iterator = new \FilesystemIterator(
             $this->path,
@@ -101,51 +99,49 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota {
           | \FilesystemIterator::SKIP_DOTS
         );
         foreach ($iterator as $entry) {
-
             $nodes[] = $this->getChild($entry->getFilename());
-
         }
-        return $nodes;
 
+        return $nodes;
     }
 
     /**
      * Checks if a child exists.
      *
      * @param string $name
+     *
      * @return bool
      */
-    function childExists($name) {
+    public function childExists($name)
+    {
+        $path = $this->path.'/'.$name;
 
-        $path = $this->path . '/' . $name;
         return file_exists($path);
-
     }
 
     /**
-     * Deletes all files in this directory, and then itself
-     *
-     * @return void
+     * Deletes all files in this directory, and then itself.
      */
-    function delete() {
-
-        foreach ($this->getChildren() as $child) $child->delete();
+    public function delete()
+    {
+        foreach ($this->getChildren() as $child) {
+            $child->delete();
+        }
         rmdir($this->path);
-
     }
 
     /**
-     * Returns available diskspace information
+     * Returns available diskspace information.
      *
      * @return array
      */
-    function getQuotaInfo() {
+    public function getQuotaInfo()
+    {
         $absolute = realpath($this->path);
+
         return [
             disk_total_space($absolute) - disk_free_space($absolute),
-            disk_free_space($absolute)
+            disk_free_space($absolute),
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/FS/File.php b/vendor/sabre/dav/lib/DAV/FS/File.php
index 4fc5af057..b78a80138 100644
--- a/vendor/sabre/dav/lib/DAV/FS/File.php
+++ b/vendor/sabre/dav/lib/DAV/FS/File.php
@@ -1,66 +1,61 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\FS;
 
 use Sabre\DAV;
 
 /**
- * File class
+ * File class.
  *
  * @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 Node implements DAV\IFile {
-
+class File extends Node implements DAV\IFile
+{
     /**
-     * Updates the data
+     * Updates the data.
      *
      * @param resource $data
-     * @return void
      */
-    function put($data) {
-
+    public function put($data)
+    {
         file_put_contents($this->path, $data);
         clearstatcache(true, $this->path);
-
     }
 
     /**
-     * Returns the data
+     * Returns the data.
      *
      * @return resource
      */
-    function get() {
-
+    public function get()
+    {
         return fopen($this->path, 'r');
-
     }
 
     /**
-     * Delete the current file
-     *
-     * @return void
+     * Delete the current file.
      */
-    function delete() {
-
+    public function delete()
+    {
         unlink($this->path);
-
     }
 
     /**
-     * Returns the size of the node, in bytes
+     * Returns the size of the node, in bytes.
      *
      * @return int
      */
-    function getSize() {
-
+    public function getSize()
+    {
         return filesize($this->path);
-
     }
 
     /**
-     * Returns the ETag for a file
+     * Returns the ETag for a file.
      *
      * An ETag is a unique identifier representing the current version of the file. If the file changes, the ETag MUST change.
      * The ETag is an arbitrary string, but MUST be surrounded by double-quotes.
@@ -69,27 +64,24 @@ class File extends Node implements DAV\IFile {
      *
      * @return mixed
      */
-    function getETag() {
-
-        return '"' . sha1(
-            fileinode($this->path) .
-            filesize($this->path) .
+    public function getETag()
+    {
+        return '"'.sha1(
+            fileinode($this->path).
+            filesize($this->path).
             filemtime($this->path)
-        ) . '"';
-
+        ).'"';
     }
 
     /**
-     * Returns the mime-type for a file
+     * Returns the mime-type for a file.
      *
      * If null is returned, we'll assume application/octet-stream
      *
      * @return mixed
      */
-    function getContentType() {
-
+    public function getContentType()
+    {
         return null;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/FS/Node.php b/vendor/sabre/dav/lib/DAV/FS/Node.php
index 424718f96..32aa74755 100644
--- a/vendor/sabre/dav/lib/DAV/FS/Node.php
+++ b/vendor/sabre/dav/lib/DAV/FS/Node.php
@@ -1,12 +1,15 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\FS;
 
-use Sabre\DAV;
-use Sabre\HTTP\URLUtil;
+use Sabre\DAV\Exception\Forbidden;
+use Sabre\DAV\INode;
+use Sabre\Uri;
 
 /**
- * Base node-class
+ * Base node-class.
  *
  * The node class implements the method used by both the File and the Directory classes
  *
@@ -14,67 +17,80 @@ use Sabre\HTTP\URLUtil;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class Node implements DAV\INode {
-
+abstract class Node implements INode
+{
     /**
-     * The path to the current node
+     * The path to the current node.
      *
      * @var string
      */
     protected $path;
 
     /**
-     * Sets up the node, expects a full path name
+     * The overridden name of the node.
      *
-     * @param string $path
+     * @var string
      */
-    function __construct($path) {
+    protected $overrideName;
 
+    /**
+     * Sets up the node, expects a full path name.
+     *
+     * If $overrideName is set, this node shows up in the tree under a
+     * different name. In this case setName() will be disabled.
+     *
+     * @param string $path
+     * @param string $overrideName
+     */
+    public function __construct($path, $overrideName = null)
+    {
         $this->path = $path;
-
+        $this->overrideName = $overrideName;
     }
 
-
-
     /**
-     * Returns the name of the node
+     * Returns the name of the node.
      *
      * @return string
      */
-    function getName() {
+    public function getName()
+    {
+        if ($this->overrideName) {
+            return $this->overrideName;
+        }
 
-        list(, $name) = URLUtil::splitPath($this->path);
-        return $name;
+        list(, $name) = Uri\split($this->path);
 
+        return $name;
     }
 
     /**
-     * Renames the node
+     * Renames the node.
      *
      * @param string $name The new name
-     * @return void
      */
-    function setName($name) {
+    public function setName($name)
+    {
+        if ($this->overrideName) {
+            throw new Forbidden('This node cannot be renamed');
+        }
 
-        list($parentPath, ) = URLUtil::splitPath($this->path);
-        list(, $newName) = URLUtil::splitPath($name);
+        list($parentPath) = Uri\split($this->path);
+        list(, $newName) = Uri\split($name);
 
-        $newPath = $parentPath . '/' . $newName;
+        $newPath = $parentPath.'/'.$newName;
         rename($this->path, $newPath);
 
         $this->path = $newPath;
-
     }
 
     /**
-     * Returns the last modification time, as a unix timestamp
+     * Returns the last modification time, as a unix timestamp.
      *
      * @return int
      */
-    function getLastModified() {
-
+    public 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
index dd5f992db..d6aea0094 100644
--- a/vendor/sabre/dav/lib/DAV/FSExt/Directory.php
+++ b/vendor/sabre/dav/lib/DAV/FSExt/Directory.php
@@ -1,21 +1,23 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\FSExt;
 
 use Sabre\DAV;
 use Sabre\DAV\FS\Node;
 
 /**
- * Directory class
+ * 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 {
-
+class Directory extends Node implements DAV\ICollection, DAV\IQuota, DAV\IMoveTarget
+{
     /**
-     * Creates a new file in the directory
+     * 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.
@@ -34,94 +36,97 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota, DAV\IMoveTa
      * 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 string          $name Name of the file
      * @param resource|string $data Initial payload
-     * @return null|string
+     *
+     * @return string|null
      */
-    function createFile($name, $data = null) {
-
+    public function createFile($name, $data = null)
+    {
         // We're not allowing dots
-        if ($name == '.' || $name == '..') throw new DAV\Exception\Forbidden('Permission denied to . and ..');
-        $newPath = $this->path . '/' . $name;
+        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) .
+        return '"'.sha1(
+            fileinode($newPath).
+            filesize($newPath).
             filemtime($newPath)
-        ) . '"';
-
+        ).'"';
     }
 
     /**
-     * Creates a new subdirectory
+     * Creates a new subdirectory.
      *
      * @param string $name
-     * @return void
      */
-    function createDirectory($name) {
-
+    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;
+        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
+     * 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 == '.' || $name == '..') throw new DAV\Exception\Forbidden('Permission denied to . and ..');
+    public function getChild($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 self($path);
-
         } else {
-
             return new File($path);
-
         }
-
     }
 
     /**
      * Checks if a child exists.
      *
      * @param string $name
+     *
      * @return bool
      */
-    function childExists($name) {
-
-        if ($name == '.' || $name == '..')
+    public function childExists($name)
+    {
+        if ('.' == $name || '..' == $name) {
             throw new DAV\Exception\Forbidden('Permission denied to . and ..');
+        }
+        $path = $this->path.'/'.$name;
 
-        $path = $this->path . '/' . $name;
         return file_exists($path);
-
     }
 
     /**
-     * Returns an array with all the child nodes
+     * Returns an array with all the child nodes.
      *
      * @return DAV\INode[]
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         $nodes = [];
         $iterator = new \FilesystemIterator(
             $this->path,
@@ -130,44 +135,43 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota, DAV\IMoveTa
         );
 
         foreach ($iterator as $entry) {
-
             $nodes[] = $this->getChild($entry->getFilename());
-
         }
-        return $nodes;
 
+        return $nodes;
     }
 
     /**
-     * Deletes all files in this directory, and then itself
+     * Deletes all files in this directory, and then itself.
      *
      * @return bool
      */
-    function delete() {
-
+    public function delete()
+    {
         // Deleting all children
-        foreach ($this->getChildren() as $child) $child->delete();
+        foreach ($this->getChildren() as $child) {
+            $child->delete();
+        }
 
         // Removing the directory itself
         rmdir($this->path);
 
         return true;
-
     }
 
     /**
-     * Returns available diskspace information
+     * Returns available diskspace information.
      *
      * @return array
      */
-    function getQuotaInfo() {
-
+    public function getQuotaInfo()
+    {
         $total = disk_total_space(realpath($this->path));
         $free = disk_free_space(realpath($this->path));
 
         return [
             $total - $free,
-            $free
+            $free,
         ];
     }
 
@@ -186,13 +190,14 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota, DAV\IMoveTa
      * 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 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 $sourceNode) {
-
+    public function moveInto($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) {
@@ -200,12 +205,8 @@ class Directory extends Node implements DAV\ICollection, DAV\IQuota, DAV\IMoveTa
         }
 
         // PHP allows us to access protected properties from other objects, as
-        // long as they are defined in a class that has a shared inheritence
+        // long as they are defined in a class that has a shared inheritance
         // with the current class.
-        rename($sourceNode->path, $this->path . '/' . $targetName);
-
-        return true;
-
+        return rename($sourceNode->path, $this->path.'/'.$targetName);
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/FSExt/File.php b/vendor/sabre/dav/lib/DAV/FSExt/File.php
index eb5ae19fe..060ef5a48 100644
--- a/vendor/sabre/dav/lib/DAV/FSExt/File.php
+++ b/vendor/sabre/dav/lib/DAV/FSExt/File.php
@@ -1,33 +1,36 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\FSExt;
 
 use Sabre\DAV;
 use Sabre\DAV\FS\Node;
 
 /**
- * File class
+ * File class.
  *
  * @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 Node implements DAV\PartialUpdate\IPatchSupport {
-
+class File extends Node implements DAV\PartialUpdate\IPatchSupport
+{
     /**
-     * Updates the data
+     * Updates the data.
      *
      * Data is a readable stream resource.
      *
      * @param resource|string $data
+     *
      * @return string
      */
-    function put($data) {
-
+    public function put($data)
+    {
         file_put_contents($this->path, $data);
         clearstatcache(true, $this->path);
-        return $this->getETag();
 
+        return $this->getETag();
     }
 
     /**
@@ -53,21 +56,22 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
      * time.
      *
      * @param resource|string $data
-     * @param int $rangeType
-     * @param int $offset
+     * @param int             $rangeType
+     * @param int             $offset
+     *
      * @return string|null
      */
-    function patch($data, $rangeType, $offset = null) {
-
+    public function patch($data, $rangeType, $offset = null)
+    {
         switch ($rangeType) {
-            case 1 :
+            case 1:
                 $f = fopen($this->path, 'a');
                 break;
-            case 2 :
+            case 2:
                 $f = fopen($this->path, 'c');
                 fseek($f, $offset);
                 break;
-            case 3 :
+            case 3:
                 $f = fopen($this->path, 'c');
                 fseek($f, $offset, SEEK_END);
                 break;
@@ -79,34 +83,32 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
         }
         fclose($f);
         clearstatcache(true, $this->path);
-        return $this->getETag();
 
+        return $this->getETag();
     }
 
     /**
-     * Returns the data
+     * Returns the data.
      *
      * @return resource
      */
-    function get() {
-
+    public function get()
+    {
         return fopen($this->path, 'r');
-
     }
 
     /**
-     * Delete the current file
+     * Delete the current file.
      *
      * @return bool
      */
-    function delete() {
-
+    public function delete()
+    {
         return unlink($this->path);
-
     }
 
     /**
-     * Returns the ETag for a file
+     * Returns the ETag for a file.
      *
      * An ETag is a unique identifier representing the current version of the file. If the file changes, the ETag MUST change.
      * The ETag is an arbitrary string, but MUST be surrounded by double-quotes.
@@ -115,38 +117,34 @@ class File extends Node implements DAV\PartialUpdate\IPatchSupport {
      *
      * @return string|null
      */
-    function getETag() {
-
-        return '"' . sha1(
-            fileinode($this->path) .
-            filesize($this->path) .
+    public function getETag()
+    {
+        return '"'.sha1(
+            fileinode($this->path).
+            filesize($this->path).
             filemtime($this->path)
-        ) . '"';
-
+        ).'"';
     }
 
     /**
-     * Returns the mime-type for a file
+     * Returns the mime-type for a file.
      *
      * If null is returned, we'll assume application/octet-stream
      *
      * @return string|null
      */
-    function getContentType() {
-
+    public function getContentType()
+    {
         return null;
-
     }
 
     /**
-     * Returns the size of the file, in bytes
+     * Returns the size of the file, in bytes.
      *
      * @return int
      */
-    function getSize() {
-
+    public function getSize()
+    {
         return filesize($this->path);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/File.php b/vendor/sabre/dav/lib/DAV/File.php
index 5161fbd51..daf83aa4d 100644
--- a/vendor/sabre/dav/lib/DAV/File.php
+++ b/vendor/sabre/dav/lib/DAV/File.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * File class
+ * File class.
  *
  * This is a helper class, that should aid in getting file classes setup.
  * Most of its methods are implemented, and throw permission denied exceptions
@@ -12,8 +14,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class File extends Node implements IFile {
-
+abstract class File extends Node implements IFile
+{
     /**
      * Replaces the contents of the file.
      *
@@ -32,25 +34,24 @@ abstract class File extends Node implements IFile {
      * return an ETag, and just return null.
      *
      * @param string|resource $data
+     *
      * @return string|null
      */
-    function put($data) {
-
+    public function put($data)
+    {
         throw new Exception\Forbidden('Permission denied to change data');
-
     }
 
     /**
-     * Returns the data
+     * Returns the data.
      *
      * This method may either return a string or a readable stream resource
      *
      * @return mixed
      */
-    function get() {
-
+    public function get()
+    {
         throw new Exception\Forbidden('Permission denied to read this file');
-
     }
 
     /**
@@ -58,14 +59,13 @@ abstract class File extends Node implements IFile {
      *
      * @return int
      */
-    function getSize() {
-
+    public function getSize()
+    {
         return 0;
-
     }
 
     /**
-     * Returns the ETag for a file
+     * Returns the ETag for a file.
      *
      * An ETag is a unique identifier representing the current version of the file. If the file changes, the ETag MUST change.
      * The ETag is an arbitrary string, but MUST be surrounded by double-quotes.
@@ -74,23 +74,20 @@ abstract class File extends Node implements IFile {
      *
      * @return string|null
      */
-    function getETag() {
-
+    public function getETag()
+    {
         return null;
-
     }
 
     /**
-     * Returns the mime-type for a file
+     * Returns the mime-type for a file.
      *
      * If null is returned, we'll assume application/octet-stream
      *
      * @return string|null
      */
-    function getContentType() {
-
+    public function getContentType()
+    {
         return null;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/ICollection.php b/vendor/sabre/dav/lib/DAV/ICollection.php
index 7793070d3..c039dae56 100644
--- a/vendor/sabre/dav/lib/DAV/ICollection.php
+++ b/vendor/sabre/dav/lib/DAV/ICollection.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * The ICollection Interface
+ * The ICollection Interface.
  *
  * This interface should be implemented by each class that represents a collection
  *
@@ -11,10 +13,10 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ICollection extends INode {
-
+interface ICollection extends INode
+{
     /**
-     * Creates a new file in the directory
+     * 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.
@@ -33,44 +35,45 @@ interface ICollection extends INode {
      * 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 string          $name Name of the file
      * @param resource|string $data Initial payload
-     * @return null|string
+     *
+     * @return string|null
      */
-    function createFile($name, $data = null);
+    public function createFile($name, $data = null);
 
     /**
-     * Creates a new subdirectory
+     * Creates a new subdirectory.
      *
      * @param string $name
-     * @return void
      */
-    function createDirectory($name);
+    public function createDirectory($name);
 
     /**
-     * Returns a specific child node, referenced by its name
+     * 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 $name
+     *
      * @return INode
      */
-    function getChild($name);
+    public function getChild($name);
 
     /**
-     * Returns an array with all the child nodes
+     * Returns an array with all the child nodes.
      *
      * @return INode[]
      */
-    function getChildren();
+    public function getChildren();
 
     /**
-     * Checks if a child-node with the specified name exists
+     * Checks if a child-node with the specified name exists.
      *
      * @param string $name
+     *
      * @return bool
      */
-    function childExists($name);
-
+    public function childExists($name);
 }
diff --git a/vendor/sabre/dav/lib/DAV/ICopyTarget.php b/vendor/sabre/dav/lib/DAV/ICopyTarget.php
new file mode 100644
index 000000000..47227138a
--- /dev/null
+++ b/vendor/sabre/dav/lib/DAV/ICopyTarget.php
@@ -0,0 +1,38 @@
+<?php
+
+declare(strict_types=1);
+
+namespace Sabre\DAV;
+
+/**
+ * By implementing this interface, a collection can effectively say "other
+ * nodes may be copied into this collection".
+ *
+ * If a backend supports a better optimized copy operation, e.g. by avoiding
+ * copying the contents, 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 ICopyTarget extends ICollection
+{
+    /**
+     * Copies a node into this collection.
+     *
+     * It is up to the implementors to:
+     *   1. Create the new resource.
+     *   2. Copy the data and any properties.
+     *
+     * If you return true from this function, the assumption
+     * is that the copy was successful.
+     * If you return false, sabre/dav will handle the copy itself.
+     *
+     * @param string $targetName new local file/collection name
+     * @param string $sourcePath Full path to source node
+     * @param INode  $sourceNode Source node itself
+     *
+     * @return bool
+     */
+    public function copyInto($targetName, $sourcePath, INode $sourceNode);
+}
diff --git a/vendor/sabre/dav/lib/DAV/IExtendedCollection.php b/vendor/sabre/dav/lib/DAV/IExtendedCollection.php
index c561d7072..d43b44bcb 100644
--- a/vendor/sabre/dav/lib/DAV/IExtendedCollection.php
+++ b/vendor/sabre/dav/lib/DAV/IExtendedCollection.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
@@ -12,8 +14,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IExtendedCollection extends ICollection {
-
+interface IExtendedCollection extends ICollection
+{
     /**
      * Creates a new collection.
      *
@@ -34,10 +36,9 @@ interface IExtendedCollection extends ICollection {
      * property for you.
      *
      * @param string $name
-     * @param MkCol $mkCol
+     * @param MkCol  $mkCol
+     *
      * @throws Exception\InvalidResourceType
-     * @return void
      */
-    function createExtendedCollection($name, MkCol $mkCol);
-
+    public function createExtendedCollection($name, MkCol $mkCol);
 }
diff --git a/vendor/sabre/dav/lib/DAV/IFile.php b/vendor/sabre/dav/lib/DAV/IFile.php
index 19d8d8637..974aee00d 100644
--- a/vendor/sabre/dav/lib/DAV/IFile.php
+++ b/vendor/sabre/dav/lib/DAV/IFile.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * This interface represents a file in the directory tree
+ * This interface represents a file in the directory tree.
  *
  * A file is a bit of a broad definition. In general it implies that on
  * this specific node a PUT or GET method may be performed, to either update,
@@ -13,8 +15,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IFile extends INode {
-
+interface IFile extends INode
+{
     /**
      * Replaces the contents of the file.
      *
@@ -33,30 +35,31 @@ interface IFile extends INode {
      * return an ETag, and just return null.
      *
      * @param resource|string $data
+     *
      * @return string|null
      */
-    function put($data);
+    public function put($data);
 
     /**
-     * Returns the data
+     * Returns the data.
      *
      * This method may either return a string or a readable stream resource
      *
      * @return mixed
      */
-    function get();
+    public function get();
 
     /**
-     * Returns the mime-type for a file
+     * Returns the mime-type for a file.
      *
      * If null is returned, we'll assume application/octet-stream
      *
      * @return string|null
      */
-    function getContentType();
+    public function getContentType();
 
     /**
-     * Returns the ETag for a file
+     * Returns the ETag for a file.
      *
      * An ETag is a unique identifier representing the current version of the file. If the file changes, the ETag MUST change.
      *
@@ -69,13 +72,12 @@ interface IFile extends INode {
      *
      * @return string|null
      */
-    function getETag();
+    public function getETag();
 
     /**
-     * Returns the size of the node, in bytes
+     * Returns the size of the node, in bytes.
      *
      * @return int
      */
-    function getSize();
-
+    public function getSize();
 }
diff --git a/vendor/sabre/dav/lib/DAV/IMoveTarget.php b/vendor/sabre/dav/lib/DAV/IMoveTarget.php
index 92fde1d5c..18a24081e 100644
--- a/vendor/sabre/dav/lib/DAV/IMoveTarget.php
+++ b/vendor/sabre/dav/lib/DAV/IMoveTarget.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
@@ -17,8 +19,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IMoveTarget extends ICollection {
-
+interface IMoveTarget extends ICollection
+{
     /**
      * Moves a node into this collection.
      *
@@ -34,11 +36,11 @@ interface IMoveTarget extends ICollection {
      * 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 $targetName new local file/collection name
      * @param string $sourcePath Full path to source node
-     * @param INode $sourceNode Source node itself
+     * @param INode  $sourceNode Source node itself
+     *
      * @return bool
      */
-    function moveInto($targetName, $sourcePath, INode $sourceNode);
-
+    public function moveInto($targetName, $sourcePath, INode $sourceNode);
 }
diff --git a/vendor/sabre/dav/lib/DAV/IMultiGet.php b/vendor/sabre/dav/lib/DAV/IMultiGet.php
index e26b457ef..445e761eb 100644
--- a/vendor/sabre/dav/lib/DAV/IMultiGet.php
+++ b/vendor/sabre/dav/lib/DAV/IMultiGet.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * IMultiGet
+ * IMultiGet.
  *
  * This interface adds a tiny bit of functionality to collections.
  *
@@ -20,8 +22,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IMultiGet extends ICollection {
-
+interface IMultiGet extends ICollection
+{
     /**
      * This method receives a list of paths in it's first argument.
      * It must return an array with Node objects.
@@ -29,8 +31,8 @@ interface IMultiGet extends ICollection {
      * If any children are not found, you do not have to return them.
      *
      * @param string[] $paths
+     *
      * @return array
      */
-    function getMultipleChildren(array $paths);
-
+    public function getMultipleChildren(array $paths);
 }
diff --git a/vendor/sabre/dav/lib/DAV/INode.php b/vendor/sabre/dav/lib/DAV/INode.php
index bb884934d..f3e7e395b 100644
--- a/vendor/sabre/dav/lib/DAV/INode.php
+++ b/vendor/sabre/dav/lib/DAV/INode.php
@@ -1,22 +1,22 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * The INode interface is the base interface, and the parent class of both ICollection and IFile
+ * The INode interface is the base interface, and the parent class of both ICollection and IFile.
  *
  * @copyright Copyright (C) fruux GmbH (https://fruux.com/)
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface INode {
-
+interface INode
+{
     /**
-     * Deleted the current node
-     *
-     * @return void
+     * Deleted the current node.
      */
-    function delete();
+    public function delete();
 
     /**
      * Returns the name of the node.
@@ -25,15 +25,14 @@ interface INode {
      *
      * @return string
      */
-    function getName();
+    public function getName();
 
     /**
-     * Renames the node
+     * Renames the node.
      *
      * @param string $name The new name
-     * @return void
      */
-    function setName($name);
+    public function setName($name);
 
     /**
      * Returns the last modification time, as a unix timestamp. Return null
@@ -41,6 +40,5 @@ interface INode {
      *
      * @return int|null
      */
-    function getLastModified();
-
+    public function getLastModified();
 }
diff --git a/vendor/sabre/dav/lib/DAV/IProperties.php b/vendor/sabre/dav/lib/DAV/IProperties.php
index 00969c2c4..d50fdff20 100644
--- a/vendor/sabre/dav/lib/DAV/IProperties.php
+++ b/vendor/sabre/dav/lib/DAV/IProperties.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * IProperties interface
+ * IProperties interface.
  *
  * Implement this interface to support custom WebDAV properties requested and sent from clients.
  *
@@ -11,8 +13,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IProperties extends INode {
-
+interface IProperties extends INode
+{
     /**
      * Updates properties on this node.
      *
@@ -23,9 +25,8 @@ interface IProperties extends INode {
      * Read the PropPatch documentation for more information.
      *
      * @param PropPatch $propPatch
-     * @return void
      */
-    function propPatch(PropPatch $propPatch);
+    public function propPatch(PropPatch $propPatch);
 
     /**
      * Returns a list of properties for this nodes.
@@ -40,8 +41,8 @@ interface IProperties extends INode {
      * The Server class will filter out the extra.
      *
      * @param array $properties
+     *
      * @return array
      */
-    function getProperties($properties);
-
+    public function getProperties($properties);
 }
diff --git a/vendor/sabre/dav/lib/DAV/IQuota.php b/vendor/sabre/dav/lib/DAV/IQuota.php
index e16f386b9..7d72e1174 100644
--- a/vendor/sabre/dav/lib/DAV/IQuota.php
+++ b/vendor/sabre/dav/lib/DAV/IQuota.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * IQuota interface
+ * IQuota interface.
  *
  * Implement this interface to add the ability to return quota information. The ObjectTree
  * will check for quota information on any given node. If the information is not available it will
@@ -13,14 +15,13 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IQuota extends ICollection {
-
+interface IQuota extends ICollection
+{
     /**
-     * Returns the quota information
+     * Returns the quota information.
      *
      * This method MUST return an array with 2 values, the first being the total used space,
      * the second the available space (in bytes)
      */
-    function getQuotaInfo();
-
+    public function getQuotaInfo();
 }
diff --git a/vendor/sabre/dav/lib/DAV/Locks/Backend/AbstractBackend.php b/vendor/sabre/dav/lib/DAV/Locks/Backend/AbstractBackend.php
index 044316cdb..a1bf48699 100644
--- a/vendor/sabre/dav/lib/DAV/Locks/Backend/AbstractBackend.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Backend/AbstractBackend.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Locks\Backend;
 
 /**
@@ -13,6 +15,6 @@ namespace Sabre\DAV\Locks\Backend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class AbstractBackend implements BackendInterface {
-
+abstract class AbstractBackend implements BackendInterface
+{
 }
diff --git a/vendor/sabre/dav/lib/DAV/Locks/Backend/BackendInterface.php b/vendor/sabre/dav/lib/DAV/Locks/Backend/BackendInterface.php
index a2d2fe89c..9a6919f50 100644
--- a/vendor/sabre/dav/lib/DAV/Locks/Backend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Backend/BackendInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Locks\Backend;
 
 use Sabre\DAV\Locks;
@@ -12,10 +14,10 @@ use Sabre\DAV\Locks;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface BackendInterface {
-
+interface BackendInterface
+{
     /**
-     * Returns a list of Sabre\DAV\Locks\LockInfo objects
+     * 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.
@@ -24,27 +26,29 @@ interface BackendInterface {
      * any locks in the subtree of the uri for locks.
      *
      * @param string $uri
-     * @param bool $returnChildLocks
+     * @param bool   $returnChildLocks
+     *
      * @return array
      */
-    function getLocks($uri, $returnChildLocks);
+    public function getLocks($uri, $returnChildLocks);
 
     /**
-     * Locks a uri
+     * Locks a uri.
      *
-     * @param string $uri
+     * @param string         $uri
      * @param Locks\LockInfo $lockInfo
+     *
      * @return bool
      */
-    function lock($uri, Locks\LockInfo $lockInfo);
+    public function lock($uri, Locks\LockInfo $lockInfo);
 
     /**
-     * Removes a lock from a uri
+     * Removes a lock from a uri.
      *
-     * @param string $uri
+     * @param string         $uri
      * @param Locks\LockInfo $lockInfo
+     *
      * @return bool
      */
-    function unlock($uri, Locks\LockInfo $lockInfo);
-
+    public function unlock($uri, Locks\LockInfo $lockInfo);
 }
diff --git a/vendor/sabre/dav/lib/DAV/Locks/Backend/File.php b/vendor/sabre/dav/lib/DAV/Locks/Backend/File.php
index 849539bee..5957f35dd 100644
--- a/vendor/sabre/dav/lib/DAV/Locks/Backend/File.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Backend/File.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Locks\Backend;
 
 use Sabre\DAV\Locks\LockInfo;
@@ -17,28 +19,27 @@ use Sabre\DAV\Locks\LockInfo;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class File extends AbstractBackend {
-
+class File extends AbstractBackend
+{
     /**
-     * The storage file
+     * The storage file.
      *
      * @var string
      */
     private $locksFile;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param string $locksFile path to file
      */
-    function __construct($locksFile) {
-
+    public function __construct($locksFile)
+    {
         $this->locksFile = $locksFile;
-
     }
 
     /**
-     * Returns a list of Sabre\DAV\Locks\LockInfo objects
+     * 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.
@@ -47,47 +48,47 @@ class File extends AbstractBackend {
      * any locks in the subtree of the uri for locks.
      *
      * @param string $uri
-     * @param bool $returnChildLocks
+     * @param bool   $returnChildLocks
+     *
      * @return array
      */
-    function getLocks($uri, $returnChildLocks) {
-
+    public function getLocks($uri, $returnChildLocks)
+    {
         $newLocks = [];
 
         $locks = $this->getData();
 
         foreach ($locks as $lock) {
-
             if ($lock->uri === $uri ||
                 //deep locks on parents
-                ($lock->depth != 0 && strpos($uri, $lock->uri . '/') === 0) ||
+                (0 != $lock->depth && 0 === strpos($uri, $lock->uri.'/')) ||
 
                 // locks on children
-                ($returnChildLocks && (strpos($lock->uri, $uri . '/') === 0))) {
-
+                ($returnChildLocks && (0 === strpos($lock->uri, $uri.'/')))) {
                 $newLocks[] = $lock;
-
             }
-
         }
 
         // Checking if we can remove any of these locks
         foreach ($newLocks as $k => $lock) {
-            if (time() > $lock->timeout + $lock->created) unset($newLocks[$k]);
+            if (time() > $lock->timeout + $lock->created) {
+                unset($newLocks[$k]);
+            }
         }
-        return $newLocks;
 
+        return $newLocks;
     }
 
     /**
-     * Locks a uri
+     * Locks a uri.
      *
-     * @param string $uri
+     * @param string   $uri
      * @param LockInfo $lockInfo
+     *
      * @return bool
      */
-    function lock($uri, LockInfo $lockInfo) {
-
+    public function lock($uri, LockInfo $lockInfo)
+    {
         // We're making the lock timeout 30 minutes
         $lockInfo->timeout = 1800;
         $lockInfo->created = time();
@@ -105,32 +106,31 @@ class File extends AbstractBackend {
         }
         $locks[] = $lockInfo;
         $this->putData($locks);
-        return true;
 
+        return true;
     }
 
     /**
-     * Removes a lock from a uri
+     * Removes a lock from a uri.
      *
-     * @param string $uri
+     * @param string   $uri
      * @param LockInfo $lockInfo
+     *
      * @return bool
      */
-    function unlock($uri, LockInfo $lockInfo) {
-
+    public function unlock($uri, LockInfo $lockInfo)
+    {
         $locks = $this->getData();
         foreach ($locks as $k => $lock) {
-
             if ($lock->token == $lockInfo->token) {
-
                 unset($locks[$k]);
                 $this->putData($locks);
-                return true;
 
+                return true;
             }
         }
-        return false;
 
+        return false;
     }
 
     /**
@@ -138,9 +138,11 @@ class File extends AbstractBackend {
      *
      * @return array
      */
-    protected function getData() {
-
-        if (!file_exists($this->locksFile)) return [];
+    protected function getData()
+    {
+        if (!file_exists($this->locksFile)) {
+            return [];
+        }
 
         // opening up the file, and creating a shared lock
         $handle = fopen($this->locksFile, 'r');
@@ -155,19 +157,20 @@ class File extends AbstractBackend {
 
         // Unserializing and checking if the resource file contains data for this file
         $data = unserialize($data);
-        if (!$data) return [];
-        return $data;
+        if (!$data) {
+            return [];
+        }
 
+        return $data;
     }
 
     /**
-     * Saves the lockdata
+     * Saves the lockdata.
      *
      * @param array $newData
-     * @return void
      */
-    protected function putData(array $newData) {
-
+    protected function putData(array $newData)
+    {
         // opening up the file, and creating an exclusive lock
         $handle = fopen($this->locksFile, 'a+');
         flock($handle, LOCK_EX);
@@ -179,7 +182,5 @@ class File extends AbstractBackend {
         fwrite($handle, serialize($newData));
         flock($handle, LOCK_UN);
         fclose($handle);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Locks/Backend/PDO.php b/vendor/sabre/dav/lib/DAV/Locks/Backend/PDO.php
index 510f266f7..36a12d1ab 100644
--- a/vendor/sabre/dav/lib/DAV/Locks/Backend/PDO.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Backend/PDO.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Locks\Backend;
 
 use Sabre\DAV\Locks\LockInfo;
@@ -14,8 +16,8 @@ use Sabre\DAV\Locks\LockInfo;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PDO extends AbstractBackend {
-
+class PDO extends AbstractBackend
+{
     /**
      * The PDO tablename this backend uses.
      *
@@ -24,25 +26,24 @@ class PDO extends AbstractBackend {
     public $tableName = 'locks';
 
     /**
-     * The PDO connection object
+     * The PDO connection object.
      *
      * @var pdo
      */
     protected $pdo;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param \PDO $pdo
      */
-    function __construct(\PDO $pdo) {
-
+    public function __construct(\PDO $pdo)
+    {
         $this->pdo = $pdo;
-
     }
 
     /**
-     * Returns a list of Sabre\DAV\Locks\LockInfo objects
+     * 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.
@@ -51,16 +52,17 @@ class PDO extends AbstractBackend {
      * any locks in the subtree of the uri for locks.
      *
      * @param string $uri
-     * @param bool $returnChildLocks
+     * @param bool   $returnChildLocks
+     *
      * @return array
      */
-    function getLocks($uri, $returnChildLocks) {
-
+    public function getLocks($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)) AND ((uri = ?)';
-        $params = [time(),$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);
@@ -71,20 +73,18 @@ class PDO extends AbstractBackend {
         $currentPath = '';
 
         foreach ($uriParts as $part) {
-
-            if ($currentPath) $currentPath .= '/';
+            if ($currentPath) {
+                $currentPath .= '/';
+            }
             $currentPath .= $part;
 
             $query .= ' OR (depth!=0 AND uri = ?)';
             $params[] = $currentPath;
-
         }
 
         if ($returnChildLocks) {
-
             $query .= ' OR (uri LIKE ?)';
-            $params[] = $uri . '/%';
-
+            $params[] = $uri.'/%';
         }
         $query .= ')';
 
@@ -94,7 +94,6 @@ class PDO extends AbstractBackend {
 
         $lockList = [];
         foreach ($result as $row) {
-
             $lockInfo = new LockInfo();
             $lockInfo->owner = $row['owner'];
             $lockInfo->token = $row['token'];
@@ -104,22 +103,21 @@ class PDO extends AbstractBackend {
             $lockInfo->depth = $row['depth'];
             $lockInfo->uri = $row['uri'];
             $lockList[] = $lockInfo;
-
         }
 
         return $lockList;
-
     }
 
     /**
-     * Locks a uri
+     * Locks a uri.
      *
-     * @param string $uri
+     * @param string   $uri
      * @param LockInfo $lockInfo
+     *
      * @return bool
      */
-    function lock($uri, LockInfo $lockInfo) {
-
+    public function lock($uri, LockInfo $lockInfo)
+    {
         // We're making the lock timeout 30 minutes
         $lockInfo->timeout = 30 * 60;
         $lockInfo->created = time();
@@ -128,11 +126,13 @@ class PDO extends AbstractBackend {
         $locks = $this->getLocks($uri, false);
         $exists = false;
         foreach ($locks as $lock) {
-            if ($lock->token == $lockInfo->token) $exists = true;
+            if ($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 = $this->pdo->prepare('UPDATE '.$this->tableName.' SET owner = ?, timeout = ?, scope = ?, depth = ?, uri = ?, created = ? WHERE token = ?');
             $stmt->execute([
                 $lockInfo->owner,
                 $lockInfo->timeout,
@@ -140,10 +140,10 @@ class PDO extends AbstractBackend {
                 $lockInfo->depth,
                 $uri,
                 $lockInfo->created,
-                $lockInfo->token
+                $lockInfo->token,
             ]);
         } else {
-            $stmt = $this->pdo->prepare('INSERT INTO ' . $this->tableName . ' (owner,timeout,scope,depth,uri,created,token) VALUES (?,?,?,?,?,?,?)');
+            $stmt = $this->pdo->prepare('INSERT INTO '.$this->tableName.' (owner,timeout,scope,depth,uri,created,token) VALUES (?,?,?,?,?,?,?)');
             $stmt->execute([
                 $lockInfo->owner,
                 $lockInfo->timeout,
@@ -151,30 +151,26 @@ class PDO extends AbstractBackend {
                 $lockInfo->depth,
                 $uri,
                 $lockInfo->created,
-                $lockInfo->token
+                $lockInfo->token,
             ]);
         }
 
         return true;
-
     }
 
-
-
     /**
-     * Removes a lock from a uri
+     * Removes a lock from a uri.
      *
-     * @param string $uri
+     * @param string   $uri
      * @param LockInfo $lockInfo
+     *
      * @return bool
      */
-    function unlock($uri, LockInfo $lockInfo) {
-
-        $stmt = $this->pdo->prepare('DELETE FROM ' . $this->tableName . ' WHERE uri = ? AND token = ?');
+    public function unlock($uri, LockInfo $lockInfo)
+    {
+        $stmt = $this->pdo->prepare('DELETE FROM '.$this->tableName.' WHERE uri = ? AND token = ?');
         $stmt->execute([$uri, $lockInfo->token]);
 
-        return $stmt->rowCount() === 1;
-
+        return 1 === $stmt->rowCount();
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Locks/LockInfo.php b/vendor/sabre/dav/lib/DAV/Locks/LockInfo.php
index 2c8cca0fe..df8227566 100644
--- a/vendor/sabre/dav/lib/DAV/Locks/LockInfo.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/LockInfo.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Locks;
 
 /**
- * LockInfo class
+ * LockInfo class.
  *
  * An object of the LockInfo class holds all the information relevant to a
  * single lock.
@@ -12,69 +14,69 @@ namespace Sabre\DAV\Locks;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class LockInfo {
-
+class LockInfo
+{
     /**
-     * A shared lock
+     * A shared lock.
      */
     const SHARED = 1;
 
     /**
-     * An exclusive lock
+     * An exclusive lock.
      */
     const EXCLUSIVE = 2;
 
     /**
-     * A never expiring timeout
+     * A never expiring timeout.
      */
     const TIMEOUT_INFINITE = -1;
 
     /**
-     * The owner of the lock
+     * The owner of the lock.
      *
      * @var string
      */
     public $owner;
 
     /**
-     * The locktoken
+     * The locktoken.
      *
      * @var string
      */
     public $token;
 
     /**
-     * How long till the lock is expiring
+     * How long till the lock is expiring.
      *
      * @var int
      */
     public $timeout;
 
     /**
-     * UNIX Timestamp of when this lock was created
+     * UNIX Timestamp of when this lock was created.
      *
      * @var int
      */
     public $created;
 
     /**
-     * Exclusive or shared lock
+     * Exclusive or shared lock.
      *
      * @var int
      */
     public $scope = self::EXCLUSIVE;
 
     /**
-     * Depth of lock, can be 0 or Sabre\DAV\Server::DEPTH_INFINITY
+     * Depth of lock, can be 0 or Sabre\DAV\Server::DEPTH_INFINITY.
      */
     public $depth = 0;
 
     /**
-     * The uri this lock locks
+     * The uri this lock locks.
      *
      * TODO: This value is not always set
+     *
      * @var mixed
      */
     public $uri;
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Locks/Plugin.php b/vendor/sabre/dav/lib/DAV/Locks/Plugin.php
index 41a3bf3fa..6d3e9b883 100644
--- a/vendor/sabre/dav/lib/DAV/Locks/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Locks/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Locks;
 
 use Sabre\DAV;
@@ -7,7 +9,7 @@ use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
 
 /**
- * Locking plugin
+ * Locking plugin.
  *
  * This plugin provides locking support to a WebDAV server.
  * The easiest way to get started, is by hooking it up as such:
@@ -20,53 +22,50 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends DAV\ServerPlugin {
-
+class Plugin extends DAV\ServerPlugin
+{
     /**
-     * locksBackend
+     * locksBackend.
      *
      * @var Backend\BackendInterface
      */
     protected $locksBackend;
 
     /**
-     * server
+     * server.
      *
      * @var DAV\Server
      */
     protected $server;
 
     /**
-     * __construct
+     * __construct.
      *
      * @param Backend\BackendInterface $locksBackend
      */
-    function __construct(Backend\BackendInterface $locksBackend) {
-
+    public function __construct(Backend\BackendInterface $locksBackend)
+    {
         $this->locksBackend = $locksBackend;
-
     }
 
     /**
-     * Initializes the plugin
+     * 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) {
-
+    public 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']);
+        $server->on('method:LOCK', [$this, 'httpLock']);
+        $server->on('method:UNLOCK', [$this, 'httpUnlock']);
         $server->on('validateTokens', [$this, 'validateTokens']);
-        $server->on('propFind',       [$this, 'propFind']);
-        $server->on('afterUnbind',    [$this, 'afterUnbind']);
-
+        $server->on('propFind', [$this, 'propFind']);
+        $server->on('afterUnbind', [$this, 'afterUnbind']);
     }
 
     /**
@@ -77,31 +76,28 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'locks';
-
     }
 
     /**
      * This method is called after most properties have been found
-     * it allows us to add in any Lock-related properties
+     * it allows us to add in any Lock-related properties.
      *
      * @param DAV\PropFind $propFind
-     * @param DAV\INode $node
-     * @return void
+     * @param DAV\INode    $node
      */
-    function propFind(DAV\PropFind $propFind, DAV\INode $node) {
-
-        $propFind->handle('{DAV:}supportedlock', function() {
+    public 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) {
+        $propFind->handle('{DAV:}lockdiscovery', function () use ($propFind) {
             return new DAV\Xml\Property\LockDiscovery(
                 $this->getLocks($propFind->getPath())
             );
         });
-
     }
 
     /**
@@ -112,12 +108,12 @@ class Plugin extends DAV\ServerPlugin {
      * available for the specified uri.
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getHTTPMethods($uri) {
-
-        return ['LOCK','UNLOCK'];
-
+    public function getHTTPMethods($uri)
+    {
+        return ['LOCK', 'UNLOCK'];
     }
 
     /**
@@ -128,14 +124,13 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return [2];
-
     }
 
     /**
-     * Returns all lock information on a particular uri
+     * 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.
      *
@@ -144,17 +139,17 @@ class Plugin extends DAV\ServerPlugin {
      * for any possible locks and return those as well.
      *
      * @param string $uri
-     * @param bool $returnChildLocks
+     * @param bool   $returnChildLocks
+     *
      * @return array
      */
-    function getLocks($uri, $returnChildLocks = false) {
-
+    public function getLocks($uri, $returnChildLocks = false)
+    {
         return $this->locksBackend->getLocks($uri, $returnChildLocks);
-
     }
 
     /**
-     * Locks an uri
+     * 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
@@ -164,12 +159,13 @@ class Plugin extends DAV\ServerPlugin {
      *
      * 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 RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpLock(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpLock(RequestInterface $request, ResponseInterface $response)
+    {
         $uri = $request->getPath();
 
         $existingLocks = $this->getLocks($uri);
@@ -180,7 +176,7 @@ class Plugin extends DAV\ServerPlugin {
             $existingLock = null;
             // Checking if there's already non-shared locks on the uri.
             foreach ($existingLocks as $existingLock) {
-                if ($existingLock->scope === LockInfo::EXCLUSIVE) {
+                if (LockInfo::EXCLUSIVE === $existingLock->scope) {
                     throw new DAV\Exception\ConflictingLock($existingLock);
                 }
             }
@@ -188,11 +184,10 @@ class Plugin extends DAV\ServerPlugin {
             $lockInfo = $this->parseLockRequest($body);
             $lockInfo->depth = $this->server->getHTTPDepth();
             $lockInfo->uri = $uri;
-            if ($existingLock && $lockInfo->scope != LockInfo::SHARED)
+            if ($existingLock && LockInfo::SHARED != $lockInfo->scope) {
                 throw new DAV\Exception\ConflictingLock($existingLock);
-
+            }
         } else {
-
             // Gonna check if this was a lock refresh.
             $existingLocks = $this->getLocks($uri);
             $conditions = $this->server->getIfConditions($request);
@@ -201,7 +196,7 @@ class Plugin extends DAV\ServerPlugin {
             foreach ($existingLocks as $existingLock) {
                 foreach ($conditions as $condition) {
                     foreach ($condition['tokens'] as $token) {
-                        if ($token['token'] === 'opaquelocktoken:' . $existingLock->token) {
+                        if ($token['token'] === 'opaquelocktoken:'.$existingLock->token) {
                             $found = $existingLock;
                             break 3;
                         }
@@ -216,18 +211,20 @@ class Plugin extends DAV\ServerPlugin {
                 } 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 = $lockInfo->uri;
-
+            if ($uri != $lockInfo->uri) {
+                $uri = $lockInfo->uri;
+            }
         }
 
-        if ($timeout = $this->getTimeoutHeader()) $lockInfo->timeout = $timeout;
+        if ($timeout = $this->getTimeoutHeader()) {
+            $lockInfo->timeout = $timeout;
+        }
 
         $newFile = false;
 
@@ -240,56 +237,52 @@ class Plugin extends DAV\ServerPlugin {
             //
             // 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 . '>');
+        $response->setHeader('Lock-Token', '<opaquelocktoken:'.$lockInfo->token.'>');
         $response->setStatus($newFile ? 201 : 200);
         $response->setBody($this->generateLockResponse($lockInfo));
 
         // Returning false will interrupt the event chain and mark this method
         // as 'handled'.
         return false;
-
     }
 
     /**
-     * Unlocks a uri
+     * 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 RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function httpUnlock(RequestInterface $request, ResponseInterface $response) {
-
+    public 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 (!$lockToken) throw new DAV\Exception\BadRequest('No lock token was supplied');
-
+        if (!$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 . '>';
+        if ('<' !== $lockToken[0]) {
+            $lockToken = '<'.$lockToken.'>';
+        }
 
         foreach ($locks as $lock) {
-
-            if ('<opaquelocktoken:' . $lock->token . '>' == $lockToken) {
-
+            if ('<opaquelocktoken:'.$lock->token.'>' == $lockToken) {
                 $this->unlockNode($path, $lock);
                 $response->setHeader('Content-Length', '0');
                 $response->setStatus(204);
@@ -297,14 +290,11 @@ class Plugin extends DAV\ServerPlugin {
                 // 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();
-
     }
 
     /**
@@ -313,51 +303,54 @@ class Plugin extends DAV\ServerPlugin {
      * We use this event to clean up any locks that still exist on the node.
      *
      * @param string $path
-     * @return void
      */
-    function afterUnbind($path) {
-
+    public function afterUnbind($path)
+    {
         $locks = $this->getLocks($path, $includeChildren = true);
         foreach ($locks as $lock) {
             $this->unlockNode($path, $lock);
         }
-
     }
 
     /**
-     * Locks a uri
+     * 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 string   $uri
      * @param LockInfo $lockInfo
+     *
      * @return bool
      */
-    function lockNode($uri, LockInfo $lockInfo) {
+    public function lockNode($uri, LockInfo $lockInfo)
+    {
+        if (!$this->server->emit('beforeLock', [$uri, $lockInfo])) {
+            return;
+        }
 
-        if (!$this->server->emit('beforeLock', [$uri, $lockInfo])) return;
         return $this->locksBackend->lock($uri, $lockInfo);
-
     }
 
     /**
-     * Unlocks a uri
+     * 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 string   $uri
      * @param LockInfo $lockInfo
+     *
      * @return bool
      */
-    function unlockNode($uri, LockInfo $lockInfo) {
+    public function unlockNode($uri, LockInfo $lockInfo)
+    {
+        if (!$this->server->emit('beforeUnlock', [$uri, $lockInfo])) {
+            return;
+        }
 
-        if (!$this->server->emit('beforeUnlock', [$uri, $lockInfo])) return;
         return $this->locksBackend->unlock($uri, $lockInfo);
-
     }
 
-
     /**
      * Returns the contents of the HTTP Timeout header.
      *
@@ -365,37 +358,36 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return int
      */
-    function getTimeoutHeader() {
-
+    public 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) $header = LockInfo::TIMEOUT_INFINITE;
-            else throw new DAV\Exception\BadRequest('Invalid HTTP timeout header');
-
+            if (0 === stripos($header, 'second-')) {
+                $header = (int) (substr($header, 7));
+            } elseif (0 === stripos($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
+     * Generates the response for successful LOCK requests.
      *
      * @param LockInfo $lockInfo
+     *
      * @return string
      */
-    protected function generateLockResponse(LockInfo $lockInfo) {
-
+    protected function generateLockResponse(LockInfo $lockInfo)
+    {
         return $this->server->xml->write('{DAV:}prop', [
-            '{DAV:}lockdiscovery' =>
-                new DAV\Xml\Property\LockDiscovery([$lockInfo])
+            '{DAV:}lockdiscovery' => new DAV\Xml\Property\LockDiscovery([$lockInfo]),
         ]);
     }
 
@@ -410,11 +402,10 @@ class Plugin extends DAV\ServerPlugin {
      * tokens.
      *
      * @param RequestInterface $request
-     * @param mixed $conditions
-     * @return void
+     * @param mixed            $conditions
      */
-    function validateTokens(RequestInterface $request, &$conditions) {
-
+    public function validateTokens(RequestInterface $request, &$conditions)
+    {
         // First we need to gather a list of locks that must be satisfied.
         $mustLocks = [];
         $method = $request->getMethod();
@@ -422,24 +413,23 @@ class Plugin extends DAV\ServerPlugin {
         // Methods not in that list are operations that doesn't alter any
         // resources, and we don't need to check the lock-states for.
         switch ($method) {
-
-            case 'DELETE' :
+            case 'DELETE':
                 $mustLocks = array_merge($mustLocks, $this->getLocks(
                     $request->getPath(),
                     true
                 ));
                 break;
-            case 'MKCOL' :
-            case 'MKCALENDAR' :
-            case 'PROPPATCH' :
-            case 'PUT' :
-            case 'PATCH' :
+            case 'MKCOL':
+            case 'MKCALENDAR':
+            case 'PROPPATCH':
+            case 'PUT':
+            case 'PATCH':
                 $mustLocks = array_merge($mustLocks, $this->getLocks(
                     $request->getPath(),
                     false
                 ));
                 break;
-            case 'MOVE' :
+            case 'MOVE':
                 $mustLocks = array_merge($mustLocks, $this->getLocks(
                     $request->getPath(),
                     true
@@ -449,13 +439,13 @@ class Plugin extends DAV\ServerPlugin {
                     false
                 ));
                 break;
-            case 'COPY' :
+            case 'COPY':
                 $mustLocks = array_merge($mustLocks, $this->getLocks(
                     $this->server->calculateUri($request->getHeader('Destination')),
                     false
                 ));
                 break;
-            case 'LOCK' :
+            case 'LOCK':
                 //Temporary measure.. figure out later why this is needed
                 // Here we basically ignore all incoming tokens...
                 foreach ($conditions as $ii => $condition) {
@@ -463,31 +453,29 @@ class Plugin extends DAV\ServerPlugin {
                         $conditions[$ii]['tokens'][$jj]['validToken'] = true;
                     }
                 }
-                return;
 
+                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] = $lock;
+        foreach ($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:') {
+                if ('opaquelocktoken:' !== substr($token['token'], 0, 16)) {
                     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]);
@@ -497,9 +485,7 @@ class Plugin extends DAV\ServerPlugin {
 
                         // Advancing to the next token
                         continue 2;
-
                     }
-
                 }
 
                 // If we got here, it means that there was a
@@ -514,42 +500,34 @@ class Plugin extends DAV\ServerPlugin {
                 // 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
+     * Parses a webdav lock xml body, and returns a new Sabre\DAV\Locks\LockInfo object.
      *
      * @param string $body
+     *
      * @return LockInfo
      */
-    protected function parseLockRequest($body) {
-
+    protected function parseLockRequest($body)
+    {
         $result = $this->server->xml->expect(
             '{DAV:}lockinfo',
             $body
@@ -562,7 +540,6 @@ class Plugin extends DAV\ServerPlugin {
         $lockInfo->scope = $result->scope;
 
         return $lockInfo;
-
     }
 
     /**
@@ -576,14 +553,12 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            '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/',
+            'link' => 'http://sabre.io/dav/locks/',
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/MkCol.php b/vendor/sabre/dav/lib/DAV/MkCol.php
index 042e14bca..f3c5ea5c0 100644
--- a/vendor/sabre/dav/lib/DAV/MkCol.php
+++ b/vendor/sabre/dav/lib/DAV/MkCol.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
@@ -20,8 +22,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class MkCol extends PropPatch {
-
+class MkCol extends PropPatch
+{
     /**
      * A list of resource-types in clark-notation.
      *
@@ -32,14 +34,13 @@ class MkCol extends PropPatch {
     /**
      * Creates the MKCOL object.
      *
-     * @param string[] $resourceType List of resourcetype values.
-     * @param array $mutations List of new properties values.
+     * @param string[] $resourceType list of resourcetype values
+     * @param array    $mutations    list of new properties values
      */
-    function __construct(array $resourceType, array $mutations) {
-
+    public function __construct(array $resourceType, array $mutations)
+    {
         $this->resourceType = $resourceType;
         parent::__construct($mutations);
-
     }
 
     /**
@@ -47,10 +48,9 @@ class MkCol extends PropPatch {
      *
      * @return string[]
      */
-    function getResourceType() {
-
+    public function getResourceType()
+    {
         return $this->resourceType;
-
     }
 
     /**
@@ -61,12 +61,11 @@ class MkCol extends PropPatch {
      * checked.
      *
      * @param string|string[] $resourceType
+     *
      * @return bool
      */
-    function hasResourceType($resourceType) {
-
-        return count(array_diff((array)$resourceType, $this->resourceType)) === 0;
-
+    public function hasResourceType($resourceType)
+    {
+        return 0 === count(array_diff((array) $resourceType, $this->resourceType));
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Mount/Plugin.php b/vendor/sabre/dav/lib/DAV/Mount/Plugin.php
index dc923ad85..5eaa4d462 100644
--- a/vendor/sabre/dav/lib/DAV/Mount/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Mount/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Mount;
 
 use Sabre\DAV;
@@ -7,7 +9,7 @@ use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
 
 /**
- * This plugin provides support for RFC4709: Mounting WebDAV servers
+ * This plugin provides support for RFC4709: Mounting WebDAV servers.
  *
  * Simply append ?mount to any collection to generate the davmount response.
  *
@@ -15,40 +17,41 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends DAV\ServerPlugin {
-
+class Plugin extends DAV\ServerPlugin
+{
     /**
-     * Reference to Server class
+     * Reference to Server class.
      *
      * @var DAV\Server
      */
     protected $server;
 
     /**
-     * Initializes the plugin and registers event handles
+     * Initializes the plugin and registers event handles.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public function initialize(DAV\Server $server)
+    {
         $this->server = $server;
         $this->server->on('method:GET', [$this, 'httpGet'], 90);
-
     }
 
     /**
      * 'beforeMethod' event handles. This event handles intercepts GET requests ending
-     * with ?mount
+     * with ?mount.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpGet(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpGet(RequestInterface $request, ResponseInterface $response)
+    {
         $queryParams = $request->getQueryParameters();
-        if (!array_key_exists('mount', $queryParams)) return;
+        if (!array_key_exists('mount', $queryParams)) {
+            return;
+        }
 
         $currentUri = $request->getAbsoluteUrl();
 
@@ -59,28 +62,23 @@ class Plugin extends DAV\ServerPlugin {
 
         // Returning false to break the event chain
         return false;
-
     }
 
     /**
-     * Generates the davmount response
+     * Generates the davmount response.
      *
      * @param ResponseInterface $response
-     * @param string $uri absolute uri
-     * @return void
+     * @param string            $uri      absolute uri
      */
-    function davMount(ResponseInterface $response, $uri) {
-
+    public function davMount(ResponseInterface $response, $uri)
+    {
         $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>";
+        echo '  <dm:url>', htmlspecialchars($uri, ENT_NOQUOTES, 'UTF-8'), "</dm:url>\n";
+        echo '</dm:mount>';
         $response->setBody(ob_get_clean());
-
     }
-
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Node.php b/vendor/sabre/dav/lib/DAV/Node.php
index ef6eea18e..948060d9a 100644
--- a/vendor/sabre/dav/lib/DAV/Node.php
+++ b/vendor/sabre/dav/lib/DAV/Node.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * Node class
+ * Node class.
  *
  * This is a helper class, that should aid in getting nodes setup.
  *
@@ -11,8 +13,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class Node implements INode {
-
+abstract class Node implements INode
+{
     /**
      * Returns the last modification time as a unix timestamp.
      *
@@ -20,35 +22,30 @@ abstract class Node implements INode {
      *
      * @return int
      */
-    function getLastModified() {
-
+    public function getLastModified()
+    {
         return null;
-
     }
 
     /**
-     * Deletes the current node
+     * Deletes the current node.
      *
      * @throws Exception\Forbidden
-     * @return void
      */
-    function delete() {
-
+    public function delete()
+    {
         throw new Exception\Forbidden('Permission denied to delete node');
-
     }
 
     /**
-     * Renames the node
+     * Renames the node.
      *
      * @param string $name The new name
+     *
      * @throws Exception\Forbidden
-     * @return void
      */
-    function setName($name) {
-
+    public function setName($name)
+    {
         throw new Exception\Forbidden('Permission denied to rename file');
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/PartialUpdate/IPatchSupport.php b/vendor/sabre/dav/lib/DAV/PartialUpdate/IPatchSupport.php
index 97d24f9cb..e516f4d08 100644
--- a/vendor/sabre/dav/lib/DAV/PartialUpdate/IPatchSupport.php
+++ b/vendor/sabre/dav/lib/DAV/PartialUpdate/IPatchSupport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\PartialUpdate;
 
 use Sabre\DAV;
@@ -7,14 +9,14 @@ use Sabre\DAV;
 /**
  * This interface provides a way to modify only part of a target resource
  * It may be used to update a file chunk, upload big a file into smaller
- * chunks or resume an upload
+ * chunks or resume an upload.
  *
  * @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
  */
-interface IPatchSupport extends DAV\IFile {
-
+interface IPatchSupport extends DAV\IFile
+{
     /**
      * Updates the file based on a range specification.
      *
@@ -38,10 +40,10 @@ interface IPatchSupport extends DAV\IFile {
      * time.
      *
      * @param resource|string $data
-     * @param int $rangeType
-     * @param int $offset
+     * @param int             $rangeType
+     * @param int             $offset
+     *
      * @return string|null
      */
-    function patch($data, $rangeType, $offset = null);
-
+    public function patch($data, $rangeType, $offset = null);
 }
diff --git a/vendor/sabre/dav/lib/DAV/PartialUpdate/Plugin.php b/vendor/sabre/dav/lib/DAV/PartialUpdate/Plugin.php
index 9c129d705..f8ffc3706 100644
--- a/vendor/sabre/dav/lib/DAV/PartialUpdate/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/PartialUpdate/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\PartialUpdate;
 
 use Sabre\DAV;
@@ -7,7 +9,7 @@ use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
 
 /**
- * Partial update plugin (Patch method)
+ * Partial update plugin (Patch method).
  *
  * This plugin provides a way to modify only part of a target resource
  * It may bu used to update a file chunk, upload big a file into smaller
@@ -20,32 +22,30 @@ use Sabre\HTTP\ResponseInterface;
  * @author Jean-Tiare LE BIGOT (http://www.jtlebi.fr/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends DAV\ServerPlugin {
-
+class Plugin extends DAV\ServerPlugin
+{
     const RANGE_APPEND = 1;
     const RANGE_START = 2;
     const RANGE_END = 3;
 
     /**
-     * Reference to server
+     * Reference to server.
      *
      * @var DAV\Server
      */
     protected $server;
 
     /**
-     * Initializes the plugin
+     * 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) {
-
+    public function initialize(DAV\Server $server)
+    {
         $this->server = $server;
         $server->on('method:PATCH', [$this, 'httpPatch']);
-
     }
 
     /**
@@ -56,10 +56,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'partialupdate';
-
     }
 
     /**
@@ -74,10 +73,11 @@ class Plugin extends DAV\ServerPlugin {
      *     - the node implements our partial update interface
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getHTTPMethods($uri) {
-
+    public function getHTTPMethods($uri)
+    {
         $tree = $this->server->tree;
 
         if ($tree->nodeExists($uri)) {
@@ -86,8 +86,8 @@ class Plugin extends DAV\ServerPlugin {
                 return ['PATCH'];
             }
         }
-        return [];
 
+        return [];
     }
 
     /**
@@ -95,25 +95,23 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return ['sabredav-partialupdate'];
-
     }
 
     /**
-     * Patch an uri
+     * Patch an uri.
      *
      * The WebDAV patch request can be used to modify only a part of an
      * existing resource. If the resource does not exist yet and the first
      * offset is not 0, the request fails
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function httpPatch(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpPatch(RequestInterface $request, ResponseInterface $response)
+    {
         $path = $request->getPath();
 
         // Get the node. Will throw a 404 if not found
@@ -129,53 +127,55 @@ class Plugin extends DAV\ServerPlugin {
         }
 
         $contentType = strtolower(
-            $request->getHeader('Content-Type')
+            (string) $request->getHeader('Content-Type')
         );
 
-        if ($contentType != 'application/x-sabredav-partialupdate') {
-            throw new DAV\Exception\UnsupportedMediaType('Unknown Content-Type header "' . $contentType . '"');
+        if ('application/x-sabredav-partialupdate' != $contentType) {
+            throw new DAV\Exception\UnsupportedMediaType('Unknown Content-Type header "'.$contentType.'"');
         }
 
         $len = $this->server->httpRequest->getHeader('Content-Length');
-        if (!$len) throw new DAV\Exception\LengthRequired('A Content-Length header is required');
-
+        if (!$len) {
+            throw new DAV\Exception\LengthRequired('A Content-Length header is required');
+        }
         switch ($range[0]) {
-            case self::RANGE_START :
+            case self::RANGE_START:
                 // Calculate the end-range if it doesn't exist.
                 if (!$range[2]) {
                     $range[2] = $range[1] + $len - 1;
                 } else {
                     if ($range[2] < $range[1]) {
-                        throw new DAV\Exception\RequestedRangeNotSatisfiable('The end offset (' . $range[2] . ') is lower than the start offset (' . $range[1] . ')');
+                        throw new DAV\Exception\RequestedRangeNotSatisfiable('The end offset ('.$range[2].') is lower than the start offset ('.$range[1].')');
                     }
                     if ($range[2] - $range[1] + 1 != $len) {
-                        throw new DAV\Exception\RequestedRangeNotSatisfiable('Actual data length (' . $len . ') is not consistent with begin (' . $range[1] . ') and end (' . $range[2] . ') offsets');
+                        throw new DAV\Exception\RequestedRangeNotSatisfiable('Actual data length ('.$len.') is not consistent with begin ('.$range[1].') and end ('.$range[2].') offsets');
                     }
                 }
                 break;
         }
 
-        if (!$this->server->emit('beforeWriteContent', [$path, $node, null]))
+        if (!$this->server->emit('beforeWriteContent', [$path, $node, null])) {
             return;
+        }
 
         $body = $this->server->httpRequest->getBody();
 
-
         $etag = $node->patch($body, $range[0], isset($range[1]) ? $range[1] : null);
 
         $this->server->emit('afterWriteContent', [$path, $node]);
 
         $response->setHeader('Content-Length', '0');
-        if ($etag) $response->setHeader('ETag', $etag);
+        if ($etag) {
+            $response->setHeader('ETag', $etag);
+        }
         $response->setStatus(204);
 
         // Breaks the event chain
         return false;
-
     }
 
     /**
-     * Returns the HTTP custom range update header
+     * Returns the HTTP custom range update header.
      *
      * This method returns null if there is no well-formed HTTP range request
      * header. It returns array(1) if it was an append request, array(2,
@@ -192,24 +192,28 @@ class Plugin extends DAV\ServerPlugin {
      * [3,-5] - update from 5 bytes from the end of the file.
      *
      * @param RequestInterface $request
+     *
      * @return array|null
      */
-    function getHTTPUpdateRange(RequestInterface $request) {
-
+    public function getHTTPUpdateRange(RequestInterface $request)
+    {
         $range = $request->getHeader('X-Update-Range');
-        if (is_null($range)) return null;
+        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') {
+        if ('append' === $matches[1]) {
             return [self::RANGE_APPEND];
         } elseif (strlen($matches[2]) > 0) {
-            return [self::RANGE_START, $matches[2], $matches[3] ?: null];
+            return [self::RANGE_START, (int) $matches[2], (int) $matches[3] ?: null];
         } else {
-            return [self::RANGE_END, $matches[4]];
+            return [self::RANGE_END, (int) $matches[4]];
         }
-
     }
 }
diff --git a/vendor/sabre/dav/lib/DAV/PropFind.php b/vendor/sabre/dav/lib/DAV/PropFind.php
index 0940a1ce2..4b6fe28eb 100644
--- a/vendor/sabre/dav/lib/DAV/PropFind.php
+++ b/vendor/sabre/dav/lib/DAV/PropFind.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
@@ -8,10 +10,10 @@ namespace Sabre\DAV;
  * It contains the type of PROPFIND request, which properties were requested
  * and also the returned items.
  */
-class PropFind {
-
+class PropFind
+{
     /**
-     * A normal propfind
+     * A normal propfind.
      */
     const NORMAL = 0;
 
@@ -33,21 +35,21 @@ class PropFind {
     const PROPNAME = 2;
 
     /**
-     * Creates the PROPFIND object
+     * Creates the PROPFIND object.
      *
      * @param string $path
-     * @param array $properties
-     * @param int $depth
-     * @param int $requestType
+     * @param array  $properties
+     * @param int    $depth
+     * @param int    $requestType
      */
-    function __construct($path, array $properties, $depth = 0, $requestType = self::NORMAL) {
-
+    public function __construct($path, array $properties, $depth = 0, $requestType = self::NORMAL)
+    {
         $this->path = $path;
         $this->properties = $properties;
         $this->depth = $depth;
         $this->requestType = $requestType;
 
-        if ($requestType === self::ALLPROPS) {
+        if (self::ALLPROPS === $requestType) {
             $this->properties = [
                 '{DAV:}getlastmodified',
                 '{DAV:}getcontentlength',
@@ -60,13 +62,10 @@ class PropFind {
         }
 
         foreach ($this->properties as $propertyName) {
-
             // Seeding properties with 404's.
             $this->result[$propertyName] = [404, null];
-
         }
         $this->itemsLeft = count($this->result);
-
     }
 
     /**
@@ -88,68 +87,65 @@ class PropFind {
      * It's also possible to not pass a callback, but immediately pass a value
      *
      * @param string $propertyName
-     * @param mixed $valueOrCallBack
-     * @return void
+     * @param mixed  $valueOrCallBack
      */
-    function handle($propertyName, $valueOrCallBack) {
-
-        if ($this->itemsLeft && isset($this->result[$propertyName]) && $this->result[$propertyName][0] === 404) {
+    public function handle($propertyName, $valueOrCallBack)
+    {
+        if ($this->itemsLeft && isset($this->result[$propertyName]) && 404 === $this->result[$propertyName][0]) {
             if (is_callable($valueOrCallBack)) {
                 $value = $valueOrCallBack();
             } else {
                 $value = $valueOrCallBack;
             }
             if (!is_null($value)) {
-                $this->itemsLeft--;
+                --$this->itemsLeft;
                 $this->result[$propertyName] = [200, $value];
             }
         }
-
     }
 
     /**
-     * Sets the value of the property
+     * 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
+     * @param mixed  $value
+     * @param int    $status
      */
-    function set($propertyName, $value, $status = null) {
-
+    public function set($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) {
+            if (self::ALLPROPS === $this->requestType) {
                 $this->result[$propertyName] = [$status, $value];
             }
+
             return;
         }
-        if ($status !== 404 && $this->result[$propertyName][0] === 404) {
-            $this->itemsLeft--;
-        } elseif ($status === 404 && $this->result[$propertyName][0] !== 404) {
-            $this->itemsLeft++;
+        if (404 !== $status && 404 === $this->result[$propertyName][0]) {
+            --$this->itemsLeft;
+        } elseif (404 === $status && 404 !== $this->result[$propertyName][0]) {
+            ++$this->itemsLeft;
         }
         $this->result[$propertyName] = [$status, $value];
-
     }
 
     /**
      * Returns the current value for a property.
      *
      * @param string $propertyName
+     *
      * @return mixed
      */
-    function get($propertyName) {
-
+    public function get($propertyName)
+    {
         return isset($this->result[$propertyName]) ? $this->result[$propertyName][1] : null;
-
     }
 
     /**
@@ -159,24 +155,22 @@ class PropFind {
      * null will be returned.
      *
      * @param string $propertyName
+     *
      * @return int|null
      */
-    function getStatus($propertyName) {
-
+    public 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) {
-
+    public function setPath($path)
+    {
         $this->path = $path;
-
     }
 
     /**
@@ -184,10 +178,9 @@ class PropFind {
      *
      * @return string
      */
-    function getPath() {
-
+    public function getPath()
+    {
         return $this->path;
-
     }
 
     /**
@@ -195,22 +188,19 @@ class PropFind {
      *
      * @return int
      */
-    function getDepth() {
-
+    public function getDepth()
+    {
         return $this->depth;
-
     }
 
     /**
      * Updates the depth of this propfind request.
      *
      * @param int $depth
-     * @return void
      */
-    function setDepth($depth) {
-
+    public function setDepth($depth)
+    {
         $this->depth = $depth;
-
     }
 
     /**
@@ -219,19 +209,19 @@ class PropFind {
      *
      * @return array
      */
-    function get404Properties() {
-
-        if ($this->itemsLeft === 0) {
+    public function get404Properties()
+    {
+        if (0 === $this->itemsLeft) {
             return [];
         }
         $result = [];
         foreach ($this->result as $propertyName => $stuff) {
-            if ($stuff[0] === 404) {
+            if (404 === $stuff[0]) {
                 $result[] = $propertyName;
             }
         }
-        return $result;
 
+        return $result;
     }
 
     /**
@@ -241,10 +231,9 @@ class PropFind {
      *
      * @return array
      */
-    function getRequestedProperties() {
-
+    public function getRequestedProperties()
+    {
         return $this->properties;
-
     }
 
     /**
@@ -252,10 +241,9 @@ class PropFind {
      *
      * @return bool
      */
-    function isAllProps() {
-
-        return $this->requestType === self::ALLPROPS;
-
+    public function isAllProps()
+    {
+        return self::ALLPROPS === $this->requestType;
     }
 
     /**
@@ -270,8 +258,8 @@ class PropFind {
      *
      * @return array
      */
-    function getResultForMultiStatus() {
-
+    public function getResultForMultiStatus()
+    {
         $r = [
             200 => [],
             404 => [],
@@ -284,9 +272,11 @@ class PropFind {
             }
         }
         // Removing the 404's for multi-status requests.
-        if ($this->requestType === self::ALLPROPS) unset($r[404]);
-        return $r;
+        if (self::ALLPROPS === $this->requestType) {
+            unset($r[404]);
+        }
 
+        return $r;
     }
 
     /**
@@ -307,12 +297,12 @@ class PropFind {
     protected $depth = 0;
 
     /**
-     * The type of request. See the TYPE constants
+     * The type of request. See the TYPE constants.
      */
     protected $requestType;
 
     /**
-     * A list of requested properties
+     * A list of requested properties.
      *
      * @var array
      */
@@ -343,5 +333,4 @@ class PropFind {
      * @var int
      */
     protected $itemsLeft;
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/PropPatch.php b/vendor/sabre/dav/lib/DAV/PropPatch.php
index 6d599dacc..160bdb1a8 100644
--- a/vendor/sabre/dav/lib/DAV/PropPatch.php
+++ b/vendor/sabre/dav/lib/DAV/PropPatch.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 use UnexpectedValueException;
@@ -17,8 +19,8 @@ use UnexpectedValueException;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PropPatch {
-
+class PropPatch
+{
     /**
      * Properties that are being updated.
      *
@@ -52,14 +54,13 @@ class PropPatch {
     protected $failed = false;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param array $mutations A list of updates
      */
-    function __construct(array $mutations) {
-
+    public function __construct(array $mutations)
+    {
         $this->mutations = $mutations;
-
     }
 
     /**
@@ -81,21 +82,17 @@ class PropPatch {
      * code associated with the operation.
      *
      * @param string|string[] $properties
-     * @param callable $callback
-     * @return void
+     * @param callable        $callback
      */
-    function handle($properties, callable $callback) {
-
+    public function handle($properties, callable $callback)
+    {
         $usedProperties = [];
-        foreach ((array)$properties as $propertyName) {
-
+        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.
@@ -107,9 +104,8 @@ class PropPatch {
             // 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
+            $callback,
         ];
-
     }
 
     /**
@@ -118,10 +114,9 @@ class PropPatch {
      * this that you promise to process _all_ properties that are coming in.
      *
      * @param callable $callback
-     * @return void
      */
-    function handleRemaining(callable $callback) {
-
+    public function handleRemaining(callable $callback)
+    {
         $properties = $this->getRemainingMutations();
         if (!$properties) {
             // Nothing to do, don't register callback
@@ -134,44 +129,39 @@ class PropPatch {
 
             $this->propertyUpdateCallbacks[] = [
                 $properties,
-                $callback
+                $callback,
             ];
         }
-
     }
 
     /**
      * Sets the result code for one or more properties.
      *
      * @param string|string[] $properties
-     * @param int $resultCode
-     * @return void
+     * @param int             $resultCode
      */
-    function setResultCode($properties, $resultCode) {
-
-        foreach ((array)$properties as $propertyName) {
+    public function setResultCode($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) {
-
+    public function setRemainingResultCode($resultCode)
+    {
         $this->setResultCode(
             $this->getRemainingMutations(),
             $resultCode
         );
-
     }
 
     /**
@@ -181,8 +171,8 @@ class PropPatch {
      *
      * @return string[]
      */
-    function getRemainingMutations() {
-
+    public function getRemainingMutations()
+    {
         $remaining = [];
         foreach ($this->mutations as $propertyName => $propValue) {
             if (!isset($this->result[$propertyName])) {
@@ -191,7 +181,6 @@ class PropPatch {
         }
 
         return $remaining;
-
     }
 
     /**
@@ -201,8 +190,8 @@ class PropPatch {
      *
      * @return array
      */
-    function getRemainingValues() {
-
+    public function getRemainingValues()
+    {
         $remaining = [];
         foreach ($this->mutations as $propertyName => $propValue) {
             if (!isset($this->result[$propertyName])) {
@@ -211,7 +200,6 @@ class PropPatch {
         }
 
         return $remaining;
-
     }
 
     /**
@@ -222,20 +210,17 @@ class PropPatch {
      *
      * @return bool
      */
-    function commit() {
-
+    public 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;
             }
@@ -244,37 +229,32 @@ class PropPatch {
             } 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) {
+                if (202 === $status) {
                     // Failed dependency
                     $this->result[$propertyName] = 424;
                 }
             }
-
         }
 
         return !$this->failed;
-
     }
 
     /**
      * Executes a property callback with the single-property syntax.
      *
-     * @param string $propertyName
+     * @param string   $propertyName
      * @param callable $callback
-     * @return void
      */
-    private function doCallBackSingleProp($propertyName, callable $callback) {
-
+    private function doCallBackSingleProp($propertyName, callable $callback)
+    {
         $result = $callback($this->mutations[$propertyName]);
         if (is_bool($result)) {
             if ($result) {
@@ -297,18 +277,16 @@ class PropPatch {
         if ($result >= 400) {
             $this->failed = true;
         }
-
     }
 
     /**
      * Executes a property callback with the multi-property syntax.
      *
-     * @param array $propertyList
+     * @param array    $propertyList
      * @param callable $callback
-     * @return void
      */
-    private function doCallBackMultiProp(array $propertyList, callable $callback) {
-
+    private function doCallBackMultiProp(array $propertyList, callable $callback)
+    {
         $argument = [];
         foreach ($propertyList as $propertyName) {
             $argument[$propertyName] = $this->mutations[$propertyName];
@@ -327,16 +305,13 @@ class PropPatch {
                     $this->failed = true;
                 }
                 $this->result[$propertyName] = $resultCode;
-
             }
-        } elseif ($result === true) {
-
+        } elseif (true === $result) {
             // Success
             foreach ($argument as $propertyName => $propertyValue) {
                 $this->result[$propertyName] = is_null($propertyValue) ? 204 : 200;
             }
-
-        } elseif ($result === false) {
+        } elseif (false === $result) {
             // Fail :(
             $this->failed = true;
             foreach ($propertyList as $propertyName) {
@@ -345,7 +320,6 @@ class PropPatch {
         } else {
             throw new UnexpectedValueException('A callback sent to handle() did not return an array or a bool');
         }
-
     }
 
     /**
@@ -353,21 +327,18 @@ class PropPatch {
      *
      * @return array
      */
-    function getResult() {
-
+    public function getResult()
+    {
         return $this->result;
-
     }
 
     /**
-     * Returns the full list of mutations
+     * Returns the full list of mutations.
      *
      * @return array
      */
-    function getMutations() {
-
+    public 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
index b15d7fef9..4bdc44775 100644
--- a/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/BackendInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\PropertyStorage\Backend;
 
 use Sabre\DAV\PropFind;
@@ -15,8 +17,8 @@ use Sabre\DAV\PropPatch;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface BackendInterface {
-
+interface BackendInterface
+{
     /**
      * Fetches properties for a path.
      *
@@ -30,14 +32,13 @@ interface BackendInterface {
      * However, you can also support the 'allprops' property here. In that
      * case, you should check for $propFind->isAllProps().
      *
-     * @param string $path
+     * @param string   $path
      * @param PropFind $propFind
-     * @return void
      */
-    function propFind($path, PropFind $propFind);
+    public function propFind($path, PropFind $propFind);
 
     /**
-     * Updates properties for a path
+     * Updates properties for a path.
      *
      * This method received a PropPatch object, which contains all the
      * information about the update.
@@ -45,11 +46,10 @@ interface BackendInterface {
      * 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 string    $path
      * @param PropPatch $propPatch
-     * @return void
      */
-    function propPatch($path, PropPatch $propPatch);
+    public function propPatch($path, PropPatch $propPatch);
 
     /**
      * This method is called after a node is deleted.
@@ -60,12 +60,11 @@ interface BackendInterface {
      * tree.
      *
      * @param string $path
-     * @return void
      */
-    function delete($path);
+    public function delete($path);
 
     /**
-     * This method is called after a successful MOVE
+     * 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
@@ -73,8 +72,6 @@ interface BackendInterface {
      *
      * @param string $source
      * @param string $destination
-     * @return void
      */
-    function move($source, $destination);
-
+    public function move($source, $destination);
 }
diff --git a/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/PDO.php b/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/PDO.php
index 6f3f1feaf..e640f420e 100644
--- a/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/PDO.php
+++ b/vendor/sabre/dav/lib/DAV/PropertyStorage/Backend/PDO.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\PropertyStorage\Backend;
 
 use Sabre\DAV\PropFind;
@@ -18,8 +20,8 @@ use Sabre\DAV\Xml\Property\Complex;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PDO implements BackendInterface {
-
+class PDO implements BackendInterface
+{
     /**
      * Value is stored as string.
      */
@@ -36,28 +38,27 @@ class PDO implements BackendInterface {
     const VT_OBJECT = 3;
 
     /**
-     * PDO
+     * PDO.
      *
      * @var \PDO
      */
     protected $pdo;
 
     /**
-     * PDO table name we'll be using
+     * PDO table name we'll be using.
      *
      * @var string
      */
     public $tableName = 'propertystorage';
 
     /**
-     * Creates the PDO property storage engine
+     * Creates the PDO property storage engine.
      *
      * @param \PDO $pdo
      */
-    function __construct(\PDO $pdo) {
-
+    public function __construct(\PDO $pdo)
+    {
         $this->pdo = $pdo;
-
     }
 
     /**
@@ -73,42 +74,40 @@ class PDO implements BackendInterface {
      * However, you can also support the 'allprops' property here. In that
      * case, you should check for $propFind->isAllProps().
      *
-     * @param string $path
+     * @param string   $path
      * @param PropFind $propFind
-     * @return void
      */
-    function propFind($path, PropFind $propFind) {
-
-        if (!$propFind->isAllProps() && count($propFind->get404Properties()) === 0) {
+    public function propFind($path, PropFind $propFind)
+    {
+        if (!$propFind->isAllProps() && 0 === count($propFind->get404Properties())) {
             return;
         }
 
-        $query = 'SELECT name, value, valuetype FROM ' . $this->tableName . ' WHERE path = ?';
+        $query = 'SELECT name, value, valuetype FROM '.$this->tableName.' WHERE path = ?';
         $stmt = $this->pdo->prepare($query);
         $stmt->execute([$path]);
 
         while ($row = $stmt->fetch(\PDO::FETCH_ASSOC)) {
-            if (gettype($row['value']) === 'resource') {
+            if ('resource' === gettype($row['value'])) {
                 $row['value'] = stream_get_contents($row['value']);
             }
             switch ($row['valuetype']) {
-                case null :
-                case self::VT_STRING :
+                case null:
+                case self::VT_STRING:
                     $propFind->set($row['name'], $row['value']);
                     break;
-                case self::VT_XML :
+                case self::VT_XML:
                     $propFind->set($row['name'], new Complex($row['value']));
                     break;
-                case self::VT_OBJECT :
+                case self::VT_OBJECT:
                     $propFind->set($row['name'], unserialize($row['value']));
                     break;
             }
         }
-
     }
 
     /**
-     * Updates properties for a path
+     * Updates properties for a path.
      *
      * This method received a PropPatch object, which contains all the
      * information about the update.
@@ -116,38 +115,30 @@ class PDO implements BackendInterface {
      * 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 string    $path
      * @param PropPatch $propPatch
-     * @return void
      */
-    function propPatch($path, PropPatch $propPatch) {
-
-        $propPatch->handleRemaining(function($properties) use ($path) {
-
-
-            if ($this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME) === 'pgsql') {
-
+    public function propPatch($path, PropPatch $propPatch)
+    {
+        $propPatch->handleRemaining(function ($properties) use ($path) {
+            if ('pgsql' === $this->pdo->getAttribute(\PDO::ATTR_DRIVER_NAME)) {
                 $updateSql = <<<SQL
 INSERT INTO {$this->tableName} (path, name, valuetype, value)
 VALUES (:path, :name, :valuetype, :value)
 ON CONFLICT (path, name)
 DO UPDATE SET valuetype = :valuetype, value = :value
 SQL;
-
-
             } else {
                 $updateSql = <<<SQL
 REPLACE INTO {$this->tableName} (path, name, valuetype, value)
 VALUES (:path, :name, :valuetype, :value)
 SQL;
-
             }
 
             $updateStmt = $this->pdo->prepare($updateSql);
-            $deleteStmt = $this->pdo->prepare("DELETE FROM " . $this->tableName . " WHERE path = ? AND name = ?");
+            $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;
@@ -165,17 +156,13 @@ SQL;
                     $updateStmt->bindParam('value', $value, \PDO::PARAM_LOB);
 
                     $updateStmt->execute();
-
                 } else {
                     $deleteStmt->execute([$path, $name]);
                 }
-
             }
 
             return true;
-
         });
-
     }
 
     /**
@@ -187,26 +174,24 @@ SQL;
      * tree.
      *
      * @param string $path
-     * @return void
      */
-    function delete($path) {
-
-        $stmt = $this->pdo->prepare("DELETE FROM " . $this->tableName . "  WHERE path = ? OR path LIKE ? ESCAPE '='");
+    public function delete($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 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
@@ -214,33 +199,30 @@ SQL;
      *
      * @param string $source
      * @param string $destination
-     * @return void
      */
-    function move($source, $destination) {
-
+    public function move($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 . '/%']);
+        $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 = ?');
+        $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'], $source . '/') !== 0) continue;
+            if ($row['path'] !== $source && 0 !== strpos($row['path'], $source.'/')) {
+                continue;
+            }
 
             $trailingPart = substr($row['path'], strlen($source) + 1);
             $newPath = $destination;
             if ($trailingPart) {
-                $newPath .= '/' . $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
index a66a14113..aa8610eb8 100644
--- a/vendor/sabre/dav/lib/DAV/PropertyStorage/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/PropertyStorage/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\PropertyStorage;
 
 use Sabre\DAV\INode;
@@ -23,8 +25,8 @@ use Sabre\DAV\ServerPlugin;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends ServerPlugin {
-
+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.
@@ -43,14 +45,13 @@ class Plugin extends ServerPlugin {
     public $backend;
 
     /**
-     * Creates the plugin
+     * Creates the plugin.
      *
      * @param Backend\BackendInterface $backend
      */
-    function __construct(Backend\BackendInterface $backend) {
-
+    public function __construct(Backend\BackendInterface $backend)
+    {
         $this->backend = $backend;
-
     }
 
     /**
@@ -62,15 +63,13 @@ class Plugin extends ServerPlugin {
      * 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']);
+    public 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']);
-
     }
 
     /**
@@ -80,34 +79,34 @@ class Plugin extends ServerPlugin {
      * plugin will look in the property storage backend to find them.
      *
      * @param PropFind $propFind
-     * @param INode $node
-     * @return void
+     * @param INode    $node
      */
-    function propFind(PropFind $propFind, INode $node) {
-
+    public function propFind(PropFind $propFind, INode $node)
+    {
         $path = $propFind->getPath();
         $pathFilter = $this->pathFilter;
-        if ($pathFilter && !$pathFilter($path)) return;
+        if ($pathFilter && !$pathFilter($path)) {
+            return;
+        }
         $this->backend->propFind($propFind->getPath(), $propFind);
-
     }
 
     /**
-     * Called during PROPPATCH operations
+     * 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 string    $path
      * @param PropPatch $propPatch
-     * @return void
      */
-    function propPatch($path, PropPatch $propPatch) {
-
+    public function propPatch($path, PropPatch $propPatch)
+    {
         $pathFilter = $this->pathFilter;
-        if ($pathFilter && !$pathFilter($path)) return;
+        if ($pathFilter && !$pathFilter($path)) {
+            return;
+        }
         $this->backend->propPatch($path, $propPatch);
-
     }
 
     /**
@@ -117,14 +116,14 @@ class Plugin extends ServerPlugin {
      * database.
      *
      * @param string $path
-     * @return void
      */
-    function afterUnbind($path) {
-
+    public function afterUnbind($path)
+    {
         $pathFilter = $this->pathFilter;
-        if ($pathFilter && !$pathFilter($path)) return;
+        if ($pathFilter && !$pathFilter($path)) {
+            return;
+        }
         $this->backend->delete($path);
-
     }
 
     /**
@@ -134,18 +133,20 @@ class Plugin extends ServerPlugin {
      *
      * @param string $source
      * @param string $destination
-     * @return void
      */
-    function afterMove($source, $destination) {
-
+    public function afterMove($source, $destination)
+    {
         $pathFilter = $this->pathFilter;
-        if ($pathFilter && !$pathFilter($source)) return;
+        if ($pathFilter && !$pathFilter($source)) {
+            return;
+        }
         // If the destination is filtered, afterUnbind will handle cleaning up
         // the properties.
-        if ($pathFilter && !$pathFilter($destination)) return;
+        if ($pathFilter && !$pathFilter($destination)) {
+            return;
+        }
 
         $this->backend->move($source, $destination);
-
     }
 
     /**
@@ -156,10 +157,9 @@ class Plugin extends ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'property-storage';
-
     }
 
     /**
@@ -173,13 +173,12 @@ class Plugin extends ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'This plugin allows any arbitrary WebDAV property to be set on any resource.',
-            'link'        => 'http://sabre.io/dav/property-storage/',
+            '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
index f7fcf3057..09760e9d1 100644
--- a/vendor/sabre/dav/lib/DAV/Server.php
+++ b/vendor/sabre/dav/lib/DAV/Server.php
@@ -1,76 +1,79 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 use Psr\Log\LoggerAwareInterface;
 use Psr\Log\LoggerAwareTrait;
 use Psr\Log\LoggerInterface;
 use Psr\Log\NullLogger;
-use Sabre\Event\EventEmitter;
+use Sabre\Event\EmitterInterface;
+use Sabre\Event\WildcardEmitterTrait;
 use Sabre\HTTP;
 use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
-use Sabre\HTTP\URLUtil;
 use Sabre\Uri;
 
 /**
- * Main DAV server class
+ * 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 implements LoggerAwareInterface {
-
+class Server implements LoggerAwareInterface, EmitterInterface
+{
+    use WildcardEmitterTrait;
     use LoggerAwareTrait;
 
     /**
-     * Infinity is used for some request supporting the HTTP Depth header and indicates that the operation should traverse the entire tree
+     * 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
+     * XML namespace for all SabreDAV related elements.
      */
     const NS_SABREDAV = 'http://sabredav.org/ns';
 
     /**
-     * The tree object
+     * The tree object.
      *
      * @var Tree
      */
     public $tree;
 
     /**
-     * The base uri
+     * The base uri.
      *
      * @var string
      */
     protected $baseUri = null;
 
     /**
-     * httpResponse
+     * httpResponse.
      *
      * @var HTTP\Response
      */
     public $httpResponse;
 
     /**
-     * httpRequest
+     * httpRequest.
      *
      * @var HTTP\Request
      */
     public $httpRequest;
 
     /**
-     * PHP HTTP Sapi
+     * PHP HTTP Sapi.
      *
      * @var HTTP\Sapi
      */
     public $sapi;
 
     /**
-     * The list of plugins
+     * The list of plugins.
      *
      * @var array
      */
@@ -98,7 +101,6 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * @var string[]
      */
     public $protectedProperties = [
-
         // RFC4918
         '{DAV:}getcontentlength',
         '{DAV:}getetag',
@@ -129,12 +131,11 @@ class Server extends EventEmitter implements LoggerAwareInterface {
 
         // 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
+     * of the exception in the returned XML.
      *
      * @var bool
      */
@@ -181,10 +182,10 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      *
      * @var bool
      */
-    static $exposeVersion = true;
+    public static $exposeVersion = true;
 
     /**
-     * Sets up the server
+     * 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
@@ -198,25 +199,15 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      *
      * @param Tree|INode|array|null $treeOrNode The tree object
      */
-    function __construct($treeOrNode = null) {
-
+    public 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);
@@ -229,18 +220,14 @@ class Server extends EventEmitter implements LoggerAwareInterface {
         $this->httpResponse = new HTTP\Response();
         $this->httpRequest = $this->sapi->getRequest();
         $this->addPlugin(new CorePlugin());
-
     }
 
     /**
-     * Starts the DAV Server
-     *
-     * @return void
+     * Starts the DAV Server.
      */
-    function exec() {
-
+    public function start()
+    {
         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.
@@ -252,9 +239,7 @@ class Server extends EventEmitter implements LoggerAwareInterface {
             // Setting the base url
             $this->httpRequest->setBaseUrl($this->getBaseUri());
             $this->invokeMethod($this->httpRequest, $this->httpResponse);
-
-        } catch (\Exception $e) {
-
+        } catch (\Throwable $e) {
             try {
                 $this->emit('exception', [$e]);
             } catch (\Exception $ignore) {
@@ -266,10 +251,8 @@ class Server extends EventEmitter implements LoggerAwareInterface {
             $error->setAttribute('xmlns:s', self::NS_SABREDAV);
             $DOM->appendChild($error);
 
-            $h = function($v) {
-
-                return htmlspecialchars($v, ENT_NOQUOTES, 'UTF-8');
-
+            $h = function ($v) {
+                return htmlspecialchars((string) $v, ENT_NOQUOTES, 'UTF-8');
             };
 
             if (self::$exposeVersion) {
@@ -299,18 +282,13 @@ class Server extends EventEmitter implements LoggerAwareInterface {
                 }
             }
 
-
             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';
 
@@ -318,37 +296,46 @@ class Server extends EventEmitter implements LoggerAwareInterface {
             $this->httpResponse->setHeaders($headers);
             $this->httpResponse->setBody($DOM->saveXML());
             $this->sapi->sendResponse($this->httpResponse);
-
         }
+    }
 
+    /**
+     * Alias of start().
+     *
+     * @deprecated
+     */
+    public function exec()
+    {
+        $this->start();
     }
 
     /**
-     * Sets the base server uri
+     * Sets the base server uri.
      *
      * @param string $uri
-     * @return void
      */
-    function setBaseUri($uri) {
-
+    public function setBaseUri($uri)
+    {
         // If the baseUri does not end with a slash, we must add it
-        if ($uri[strlen($uri) - 1] !== '/')
+        if ('/' !== $uri[strlen($uri) - 1]) {
             $uri .= '/';
+        }
 
         $this->baseUri = $uri;
-
     }
 
     /**
-     * Returns the base responding uri
+     * Returns the base responding uri.
      *
      * @return string
      */
-    function getBaseUri() {
+    public function getBaseUri()
+    {
+        if (is_null($this->baseUri)) {
+            $this->baseUri = $this->guessBaseUri();
+        }
 
-        if (is_null($this->baseUri)) $this->baseUri = $this->guessBaseUri();
         return $this->baseUri;
-
     }
 
     /**
@@ -359,53 +346,50 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      *
      * @return string
      */
-    function guessBaseUri() {
-
+    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($uri, '?'))
+            if ($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);
+            $decodedUri = HTTP\decodePath($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 (' . $pathInfo . '). This server might be misconfigured.');
+                return rtrim($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
+     * 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) {
-
+    public function addPlugin(ServerPlugin $plugin)
+    {
         $this->plugins[$plugin->getPluginName()] = $plugin;
         $plugin->initialize($this);
-
     }
 
     /**
@@ -414,26 +398,26 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * This function returns null if the plugin was not found.
      *
      * @param string $name
+     *
      * @return ServerPlugin
      */
-    function getPlugin($name) {
-
-        if (isset($this->plugins[$name]))
+    public function getPlugin($name)
+    {
+        if (isset($this->plugins[$name])) {
             return $this->plugins[$name];
+        }
 
         return null;
-
     }
 
     /**
-     * Returns all plugins
+     * Returns all plugins.
      *
      * @return array
      */
-    function getPlugins() {
-
+    public function getPlugins()
+    {
         return $this->plugins;
-
     }
 
     /**
@@ -441,29 +425,29 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      *
      * @return LoggerInterface
      */
-    function getLogger() {
-
+    public function getLogger()
+    {
         if (!$this->logger) {
             $this->logger = new NullLogger();
         }
-        return $this->logger;
 
+        return $this->logger;
     }
 
     /**
-     * Handles a http request, and execute a method based on its name
+     * Handles a http request, and execute a method based on its name.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @param bool $sendResponse Whether to send the HTTP response to the DAV client.
-     * @return void
+     * @param bool              $sendResponse whether to send the HTTP response to the DAV client
      */
-    function invokeMethod(RequestInterface $request, ResponseInterface $response, $sendResponse = true) {
-
+    public function invokeMethod(RequestInterface $request, ResponseInterface $response, $sendResponse = true)
+    {
         $method = $request->getMethod();
 
-        if (!$this->emit('beforeMethod:' . $method, [$request, $response])) return;
-        if (!$this->emit('beforeMethod', [$request, $response])) return;
+        if (!$this->emit('beforeMethod:'.$method, [$request, $response])) {
+            return;
+        }
 
         if (self::$exposeVersion) {
             $response->setHeader('X-Sabre-Version', Version::VERSION);
@@ -473,32 +457,31 @@ class Server extends EventEmitter implements LoggerAwareInterface {
 
         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 ($this->emit('method:'.$method, [$request, $response])) {
+            $exMessage = 'There was no plugin in the system that was willing to handle this '.$method.' method.';
+            if ('GET' === $method) {
+                $exMessage .= ' Enable the Browser plugin to get a better result here.';
             }
+
+            // Unsupported method
+            throw new Exception\NotImplemented($exMessage);
         }
 
-        if (!$this->emit('afterMethod:' . $method, [$request, $response])) return;
-        if (!$this->emit('afterMethod', [$request, $response])) return;
+        if (!$this->emit('afterMethod:'.$method, [$request, $response])) {
+            return;
+        }
 
-        if ($response->getStatus() === null) {
+        if (null === $response->getStatus()) {
             throw new Exception('No subsystem set a valid HTTP status code. Something must have interrupted the request without providing further detail.');
         }
         if ($sendResponse) {
             $this->sapi->sendResponse($response);
             $this->emit('afterResponse', [$request, $response]);
         }
-
     }
 
     // {{{ HTTP/WebDAV protocol helpers
@@ -507,10 +490,11 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * Returns an array with all the supported HTTP methods for a specific uri.
      *
      * @param string $path
+     *
      * @return array
      */
-    function getAllowedMethods($path) {
-
+    public function getAllowedMethods($path)
+    {
         $methods = [
             'OPTIONS',
             'GET',
@@ -521,7 +505,7 @@ class Server extends EventEmitter implements LoggerAwareInterface {
             'PROPPATCH',
             'COPY',
             'MOVE',
-            'REPORT'
+            'REPORT',
         ];
 
         // The MKCOL is only allowed on an unmapped uri
@@ -532,22 +516,22 @@ class Server extends EventEmitter implements LoggerAwareInterface {
         }
 
         // 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));
+        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
+     * Gets the uri for the request, keeping the base uri into consideration.
      *
      * @return string
      */
-    function getRequestUri() {
-
+    public function getRequestUri()
+    {
         return $this->calculateUri($this->httpRequest->getUrl());
-
     }
 
     /**
@@ -559,66 +543,65 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      *   * 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, '://')) {
-
+    public function calculateUri($uri)
+    {
+        if ('' != $uri && '/' != $uri[0] && strpos($uri, '://')) {
             $uri = parse_url($uri, PHP_URL_PATH);
-
         }
 
-        $uri = Uri\normalize(str_replace('//', '/', $uri));
+        $uri = Uri\normalize(preg_replace('|/+|', '/', $uri));
         $baseUri = Uri\normalize($this->getBaseUri());
 
-        if (strpos($uri, $baseUri) === 0) {
-
-            return trim(URLUtil::decodePath(substr($uri, strlen($baseUri))), '/');
+        if (0 === strpos($uri, $baseUri)) {
+            return trim(HTTP\decodePath(substr($uri, strlen($baseUri))), '/');
 
         // A special case, if the baseUri was accessed without a trailing
         // slash, we'll accept it as well.
-        } elseif ($uri . '/' === $baseUri) {
-
+        } elseif ($uri.'/' === $baseUri) {
             return '';
-
         } else {
-
-            throw new Exception\Forbidden('Requested uri (' . $uri . ') is out of base uri (' . $this->getBaseUri() . ')');
-
+            throw new Exception\Forbidden('Requested uri ('.$uri.') is out of base uri ('.$this->getBaseUri().')');
         }
-
     }
 
     /**
-     * Returns the HTTP depth header
+     * 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) {
-
+    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 (is_null($depth)) {
+            return $default;
+        }
 
+        if ('infinity' == $depth) {
+            return self::DEPTH_INFINITY;
+        }
 
         // If its an unknown value. we'll grab the default
-        if (!ctype_digit($depth)) return $default;
-
-        return (int)$depth;
+        if (!ctype_digit($depth)) {
+            return $default;
+        }
 
+        return (int) $depth;
     }
 
     /**
-     * Returns the HTTP range header
+     * Returns the HTTP range header.
      *
      * This method returns null if there is no well-formed HTTP range request
      * header or array($start, $end).
@@ -629,24 +612,29 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * 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
+     * @return int[]|null
      */
-    function getHTTPRange() {
-
+    public function getHTTPRange()
+    {
         $range = $this->httpRequest->getHeader('range');
-        if (is_null($range)) return null;
+        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, $matches)) return null;
+        if (!preg_match('/^bytes=([0-9]*)-([0-9]*)$/i', $range, $matches)) {
+            return null;
+        }
 
-        if ($matches[1] === '' && $matches[2] === '') return null;
+        if ('' === $matches[1] && '' === $matches[2]) {
+            return null;
+        }
 
         return [
-            $matches[1] !== '' ? $matches[1] : null,
-            $matches[2] !== '' ? $matches[2] : null,
+            '' !== $matches[1] ? (int) $matches[1] : null,
+            '' !== $matches[2] ? (int) $matches[2] : null,
         ];
-
     }
 
     /**
@@ -675,8 +663,8 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      *
      * @return array
      */
-    function getHTTPPrefer() {
-
+    public function getHTTPPrefer()
+    {
         $result = [
             // can be true or false
             'respond-async' => false,
@@ -689,23 +677,19 @@ class Server extends EventEmitter implements LoggerAwareInterface {
         ];
 
         if ($prefer = $this->httpRequest->getHeader('Prefer')) {
-
             $result = array_merge(
                 $result,
                 HTTP\parsePrefer($prefer)
             );
-
-        } elseif ($this->httpRequest->getHeader('Brief') == 't') {
+        } elseif ('t' == $this->httpRequest->getHeader('Brief')) {
             $result['return'] = 'minimal';
         }
 
         return $result;
-
     }
 
-
     /**
-     * Returns information about Copy and Move requests
+     * 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
@@ -715,74 +699,82 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      *   * 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\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.
+     *                                        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) {
-
+    public function getCopyAndMoveInfo(RequestInterface $request)
+    {
         // Collecting the relevant HTTP headers
-        if (!$request->getHeader('Destination')) throw new Exception\BadRequest('The destination header was not supplied');
+        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') $overwrite = false;
+        if (!$overwrite) {
+            $overwrite = 'T';
+        }
+        if ('T' == strtoupper($overwrite)) {
+            $overwrite = true;
+        } elseif ('F' == strtoupper($overwrite)) {
+            $overwrite = false;
+        }
         // We need to throw a bad request exception, if the header was invalid
-        else throw new Exception\BadRequest('The HTTP Overwrite header should be either T or F');
-
-        list($destinationDir) = URLUtil::splitPath($destination);
+        else {
+            throw new Exception\BadRequest('The HTTP Overwrite header should be either T or F');
+        }
+        list($destinationDir) = Uri\split($destination);
 
         try {
             $destinationParent = $this->tree->getNodeForPath($destinationDir);
-            if (!($destinationParent instanceof ICollection)) throw new Exception\UnsupportedMediaType('The destination node is not a collection');
+            if (!($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 (!$overwrite) throw new Exception\PreconditionFailed('The destination node already exists, and the overwrite header is set to false', 'Overwrite');
-
+            if (!$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) === $requestPath . '/') {
+        if (substr($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,
+            'destination' => $destination,
+            'destinationExists' => (bool) $destinationNode,
+            'destinationNode' => $destinationNode,
         ];
-
     }
 
     /**
-     * Returns a list of properties for a path
+     * 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
@@ -793,18 +785,18 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * returned.
      *
      * @param string $path
-     * @param array $propertyNames
+     * @param array  $propertyNames
+     *
      * @return array
      */
-    function getProperties($path, $propertyNames) {
-
+    public function getProperties($path, $propertyNames)
+    {
         $result = $this->getPropertiesForPath($path, $propertyNames, 0);
         if (isset($result[0][200])) {
             return $result[0][200];
         } else {
             return [];
         }
-
     }
 
     /**
@@ -816,26 +808,27 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * The parent node will not be returned.
      *
      * @param string $path
-     * @param array $propertyNames
+     * @param array  $propertyNames
+     *
      * @return array
      */
-    function getPropertiesForChildren($path, $propertyNames) {
-
+    public function getPropertiesForChildren($path, $propertyNames)
+    {
         $result = [];
         foreach ($this->getPropertiesForPath($path, $propertyNames, 1) as $k => $row) {
-
             // Skipping the parent path
-            if ($k === 0) continue;
+            if (0 === $k) {
+                continue;
+            }
 
             $result[$row['href']] = $row[200];
-
         }
-        return $result;
 
+        return $result;
     }
 
     /**
-     * Returns a list of HTTP headers for a particular resource
+     * 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
@@ -844,61 +837,64 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * The headers are intended to be used for HEAD and GET requests.
      *
      * @param string $path
+     *
      * @return array
      */
-    function getHTTPHeaders($path) {
-
+    public function getHTTPHeaders($path)
+    {
         $propertyMap = [
-            '{DAV:}getcontenttype'   => 'Content-Type',
+            '{DAV:}getcontenttype' => 'Content-Type',
             '{DAV:}getcontentlength' => 'Content-Length',
-            '{DAV:}getlastmodified'  => 'Last-Modified',
-            '{DAV:}getetag'          => 'ETag',
+            '{DAV:}getlastmodified' => 'Last-Modified',
+            '{DAV:}getetag' => 'ETag',
         ];
 
         $properties = $this->getProperties($path, array_keys($propertyMap));
 
         $headers = [];
         foreach ($propertyMap as $property => $header) {
-            if (!isset($properties[$property])) continue;
+            if (!isset($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());
+                $headers[$header] = HTTP\toDate($properties[$property]->getTime());
             }
-
         }
 
         return $headers;
-
     }
 
     /**
      * Small helper to support PROPFIND with DEPTH_INFINITY.
      *
      * @param PropFind $propFind
-     * @param array $yieldFirst
-     * @return \Iterator
+     * @param array    $yieldFirst
+     *
+     * @return \Traversable
      */
-    private function generatePathNodes(PropFind $propFind, array $yieldFirst = null) {
-        if ($yieldFirst !== null) {
+    private function generatePathNodes(PropFind $propFind, array $yieldFirst = null)
+    {
+        if (null !== $yieldFirst) {
             yield $yieldFirst;
         }
         $newDepth = $propFind->getDepth();
         $path = $propFind->getPath();
 
-        if ($newDepth !== self::DEPTH_INFINITY) {
-            $newDepth--;
+        if (self::DEPTH_INFINITY !== $newDepth) {
+            --$newDepth;
         }
 
         $propertyNames = $propFind->getRequestedProperties();
         $propFindType = !empty($propertyNames) ? PropFind::NORMAL : PropFind::ALLPROPS;
 
         foreach ($this->tree->getChildren($path) as $childNode) {
-            if ($path !== '') {
-                $subPath = $path . '/' . $childNode->getName();
+            if ('' !== $path) {
+                $subPath = $path.'/'.$childNode->getName();
             } else {
                 $subPath = $childNode->getName();
             }
@@ -906,20 +902,19 @@ class Server extends EventEmitter implements LoggerAwareInterface {
 
             yield [
                 $subPropFind,
-                $childNode
+                $childNode,
             ];
 
-            if (($newDepth === self::DEPTH_INFINITY || $newDepth >= 1) && $childNode instanceof ICollection) {
+            if ((self::DEPTH_INFINITY === $newDepth || $newDepth >= 1) && $childNode instanceof ICollection) {
                 foreach ($this->generatePathNodes($subPropFind) as $subItem) {
                     yield $subItem;
                 }
             }
-
         }
     }
 
     /**
-     * Returns a list of properties for a given path
+     * 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
@@ -928,20 +923,21 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * If a depth of 1 is requested child elements will also be returned.
      *
      * @param string $path
-     * @param array $propertyNames
-     * @param int $depth
+     * @param array  $propertyNames
+     * @param int    $depth
+     *
      * @return array
      *
      * @deprecated Use getPropertiesIteratorForPath() instead (as it's more memory efficient)
      * @see getPropertiesIteratorForPath()
      */
-    function getPropertiesForPath($path, $propertyNames = [], $depth = 0) {
-
+    public function getPropertiesForPath($path, $propertyNames = [], $depth = 0)
+    {
         return iterator_to_array($this->getPropertiesIteratorForPath($path, $propertyNames, $depth));
-
     }
+
     /**
-     * Returns a list of properties for a given path
+     * 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
@@ -950,33 +946,35 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * If a depth of 1 is requested child elements will also be returned.
      *
      * @param string $path
-     * @param array $propertyNames
-     * @param int $depth
+     * @param array  $propertyNames
+     * @param int    $depth
+     *
      * @return \Iterator
      */
-    function getPropertiesIteratorForPath($path, $propertyNames = [], $depth = 0) {
-
+    public function getPropertiesIteratorForPath($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) $depth = 1;
+        if (!$this->enablePropfindDepthInfinity && 0 != $depth) {
+            $depth = 1;
+        }
 
         $path = trim($path, '/');
 
         $propFindType = $propertyNames ? PropFind::NORMAL : PropFind::ALLPROPS;
-        $propFind = new PropFind($path, (array)$propertyNames, $depth, $propFindType);
+        $propFind = new PropFind($path, (array) $propertyNames, $depth, $propFindType);
 
         $parentNode = $this->tree->getNodeForPath($path);
 
         $propFindRequests = [[
             $propFind,
-            $parentNode
+            $parentNode,
         ]];
 
-        if (($depth > 0 || $depth === self::DEPTH_INFINITY) && $parentNode instanceof ICollection) {
+        if (($depth > 0 || self::DEPTH_INFINITY === $depth) && $parentNode instanceof ICollection) {
             $propFindRequests = $this->generatePathNodes(clone $propFind, current($propFindRequests));
         }
 
         foreach ($propFindRequests as $propFindRequest) {
-
             list($propFind, $node) = $propFindRequest;
             $r = $this->getPropertiesByNode($propFind, $node);
             if ($r) {
@@ -993,9 +991,7 @@ class Server extends EventEmitter implements LoggerAwareInterface {
                 }
                 yield $result;
             }
-
         }
-
     }
 
     /**
@@ -1010,17 +1006,17 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      *
      * @param array $paths
      * @param array $propertyNames
+     *
      * @return array
      */
-    function getPropertiesForMultiplePaths(array $paths, array $propertyNames = []) {
-
+    public 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) {
@@ -1032,14 +1028,11 @@ class Server extends EventEmitter implements LoggerAwareInterface {
                     $result[$path]['href'] .= '/';
                 }
             }
-
         }
 
         return $result;
-
     }
 
-
     /**
      * Determines all properties for a node.
      *
@@ -1051,13 +1044,13 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * list of properties.
      *
      * @param PropFind $propFind
-     * @param INode $node
+     * @param INode    $node
+     *
      * @return bool
      */
-    function getPropertiesByNode(PropFind $propFind, INode $node) {
-
+    public function getPropertiesByNode(PropFind $propFind, INode $node)
+    {
         return $this->emit('propFind', [$propFind, $node]);
-
     }
 
     /**
@@ -1072,13 +1065,16 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * @param string   $uri
      * @param resource $data
      * @param string   $etag
+     *
      * @return bool
      */
-    function createFile($uri, $data, &$etag = null) {
+    public function createFile($uri, $data, &$etag = null)
+    {
+        list($dir, $name) = Uri\split($uri);
 
-        list($dir, $name) = URLUtil::splitPath($uri);
-
-        if (!$this->emit('beforeBind', [$uri])) return false;
+        if (!$this->emit('beforeBind', [$uri])) {
+            return false;
+        }
 
         $parent = $this->tree->getNodeForPath($dir);
         if (!$parent instanceof ICollection) {
@@ -1091,13 +1087,17 @@ class Server extends EventEmitter implements LoggerAwareInterface {
         //
         // If $modified is true, we must not send back an ETag.
         $modified = false;
-        if (!$this->emit('beforeCreateFile', [$uri, &$data, $parent, &$modified])) return false;
+        if (!$this->emit('beforeCreateFile', [$uri, &$data, $parent, &$modified])) {
+            return false;
+        }
 
         $etag = $parent->createFile($name, $data);
 
-        if ($modified) $etag = null;
+        if ($modified) {
+            $etag = null;
+        }
 
-        $this->tree->markDirty($dir . '/' . $name);
+        $this->tree->markDirty($dir.'/'.$name);
 
         $this->emit('afterBind', [$uri]);
         $this->emit('afterCreateFile', [$uri, $parent]);
@@ -1113,10 +1113,11 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * @param string   $uri
      * @param resource $data
      * @param string   $etag
+     *
      * @return bool
      */
-    function updateFile($uri, $data, &$etag = null) {
-
+    public function updateFile($uri, $data, &$etag = null)
+    {
         $node = $this->tree->getNodeForPath($uri);
 
         // It is possible for an event handler to modify the content of the
@@ -1125,47 +1126,46 @@ class Server extends EventEmitter implements LoggerAwareInterface {
         //
         // If $modified is true, we must not send back an ETag.
         $modified = false;
-        if (!$this->emit('beforeWriteContent', [$uri, $node, &$data, &$modified])) return false;
+        if (!$this->emit('beforeWriteContent', [$uri, $node, &$data, &$modified])) {
+            return false;
+        }
 
         $etag = $node->put($data);
-        if ($modified) $etag = null;
+        if ($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) {
-
+    public function createDirectory($uri)
+    {
         $this->createCollection($uri, new MkCol(['{DAV:}collection'], []));
-
     }
 
     /**
-     * Use this method to create a new collection
+     * Use this method to create a new collection.
+     *
+     * @param string $uri   The new uri
+     * @param MkCol  $mkCol
      *
-     * @param string $uri The new uri
-     * @param MkCol $mkCol
      * @return array|null
      */
-    function createCollection($uri, MkCol $mkCol) {
-
-        list($parentUri, $newName) = URLUtil::splitPath($uri);
+    public function createCollection($uri, MkCol $mkCol)
+    {
+        list($parentUri, $newName) = Uri\split($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
@@ -1179,26 +1179,23 @@ class Server extends EventEmitter implements LoggerAwareInterface {
 
             // 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 (!$this->emit('beforeBind', [$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.
@@ -1208,7 +1205,6 @@ class Server extends EventEmitter implements LoggerAwareInterface {
             }
 
             $parent->createDirectory($newName);
-
         }
 
         // If there are any properties that have not been handled/stored,
@@ -1227,23 +1223,21 @@ class Server extends EventEmitter implements LoggerAwareInterface {
             ];
 
             foreach ($result as $propertyName => $status) {
-
                 if (!isset($formattedResult[$status])) {
                     $formattedResult[$status] = [];
                 }
                 $formattedResult[$status][$propertyName] = null;
-
             }
+
             return $formattedResult;
         }
 
         $this->tree->markDirty($parentUri);
         $this->emit('afterBind', [$uri]);
-
     }
 
     /**
-     * This method updates a resource's properties
+     * 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.
@@ -1256,17 +1250,17 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * as their values.
      *
      * @param string $path
-     * @param array $properties
+     * @param array  $properties
+     *
      * @return array
      */
-    function updateProperties($path, array $properties) {
-
+    public function updateProperties($path, array $properties)
+    {
         $propPatch = new PropPatch($properties);
         $this->emit('propPatch', [$path, $propPatch]);
         $propPatch->commit();
 
         return $propPatch->getResult();
-
     }
 
     /**
@@ -1287,19 +1281,19 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * 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 RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function checkPreconditions(RequestInterface $request, ResponseInterface $response) {
-
+    public 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
@@ -1311,13 +1305,11 @@ class Server extends EventEmitter implements LoggerAwareInterface {
             }
 
             // Only need to check entity tags if they are not *
-            if ($ifMatch !== '*') {
-
+            if ('*' !== $ifMatch) {
                 // There can be multiple ETags
                 $ifMatch = explode(',', $ifMatch);
                 $haveMatch = false;
                 foreach ($ifMatch as $ifMatchItem) {
-
                     // Stripping any extra spaces
                     $ifMatchItem = trim($ifMatchItem, ' ');
 
@@ -1331,17 +1323,17 @@ class Server extends EventEmitter implements LoggerAwareInterface {
                             $haveMatch = true;
                         }
                     }
-
                 }
                 if (!$haveMatch) {
-                    if ($etag) $response->setHeader('ETag', $etag);
-                     throw new Exception\PreconditionFailed('An If-Match header was specified, but none of the specified the ETags matched.', 'If-Match');
+                    if ($etag) {
+                        $response->setHeader('ETag', $etag);
+                    }
+                    throw new Exception\PreconditionFailed('An If-Match header was specified, but none of the specified ETags matched.', 'If-Match');
                 }
             }
         }
 
         if ($ifNoneMatch = $request->getHeader('If-None-Match')) {
-
             // The If-None-Match header contains an ETag.
             // Only if the ETag does not match the current ETag, the request will succeed
             // The header can also contain *, in which case the request
@@ -1356,46 +1348,46 @@ class Server extends EventEmitter implements LoggerAwareInterface {
             }
             if ($nodeExists) {
                 $haveMatch = false;
-                if ($ifNoneMatch === '*') $haveMatch = true;
-                else {
-
+                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) $haveMatch = true;
-
+                        if ($etag === $ifNoneMatchItem) {
+                            $haveMatch = true;
+                        }
                     }
-
                 }
 
                 if ($haveMatch) {
-                    if ($etag) $response->setHeader('ETag', $etag);
-                    if ($request->getMethod() === 'GET') {
+                    if ($etag) {
+                        $response->setHeader('ETag', $etag);
+                    }
+                    if ('GET' === $request->getMethod()) {
                         $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);
+            $date = HTTP\parseDate($ifModifiedSince);
 
             if ($date) {
                 if (is_null($node)) {
@@ -1403,10 +1395,11 @@ class Server extends EventEmitter implements LoggerAwareInterface {
                 }
                 $lastMod = $node->getLastModified();
                 if ($lastMod) {
-                    $lastMod = new \DateTime('@' . $lastMod);
+                    $lastMod = new \DateTime('@'.$lastMod);
                     if ($lastMod <= $date) {
                         $response->setStatus(304);
-                        $response->setHeader('Last-Modified', HTTP\Util::toHTTPDate($lastMod));
+                        $response->setHeader('Last-Modified', HTTP\toDate($lastMod));
+
                         return false;
                     }
                 }
@@ -1414,10 +1407,9 @@ class Server extends EventEmitter implements LoggerAwareInterface {
         }
 
         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);
+            $date = HTTP\parseDate($ifUnmodifiedSince);
 
             // We must only check the date if it's valid
             if ($date) {
@@ -1426,13 +1418,12 @@ class Server extends EventEmitter implements LoggerAwareInterface {
                 }
                 $lastMod = $node->getLastModified();
                 if ($lastMod) {
-                    $lastMod = new \DateTime('@' . $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
@@ -1461,13 +1452,11 @@ class Server extends EventEmitter implements LoggerAwareInterface {
         // 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'];
 
                 $etagValid = false;
@@ -1477,35 +1466,28 @@ class Server extends EventEmitter implements LoggerAwareInterface {
                 // Checking the ETag, only if the token was already deemed
                 // valid and there is one.
                 if ($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 ' . $uri, 'If');
-
+            throw new Exception\PreconditionFailed('Failed to find a valid token/etag combination for '.$uri, 'If');
         }
 
         return true;
-
     }
 
     /**
-     * This method is created to extract information from the WebDAV HTTP 'If:' header
+     * 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
@@ -1573,12 +1555,15 @@ class Server extends EventEmitter implements LoggerAwareInterface {
      * ]
      *
      * @param RequestInterface $request
+     *
      * @return array
      */
-    function getIfConditions(RequestInterface $request) {
-
+    public function getIfConditions(RequestInterface $request)
+    {
         $header = $request->getHeader('If');
-        if (!$header) return [];
+        if (!$header) {
+            return [];
+        }
 
         $matches = [];
 
@@ -1588,18 +1573,16 @@ class Server extends EventEmitter implements LoggerAwareInterface {
         $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'] : ''
+                    'token' => $match['token'],
+                    'etag' => isset($match['etag']) ? $match['etag'] : '',
                 ];
             } else {
-
                 if (!$match['uri']) {
                     $realUri = $request->getPath();
                 } else {
@@ -1607,55 +1590,55 @@ class Server extends EventEmitter implements LoggerAwareInterface {
                 }
 
                 $conditions[] = [
-                    'uri'    => $realUri,
+                    'uri' => $realUri,
                     'tokens' => [
                         [
                             'negate' => $match['not'] ? true : false,
-                            'token'  => $match['token'],
-                            'etag'   => isset($match['etag']) ? $match['etag'] : ''
-                        ]
+                            '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) {
-
+    public function getResourceTypeForNode(INode $node)
+    {
         $result = [];
         foreach ($this->resourceTypeMapping as $className => $resourceType) {
-            if ($node instanceof $className) $result[] = $resourceType;
+            if ($node instanceof $className) {
+                $result[] = $resourceType;
+            }
         }
-        return $result;
 
+        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|\Traversable $fileProperties The list with nodes
-     * @param bool $strip404s
+     * @param bool               $strip404s
+     *
      * @return string
      */
-    function generateMultiStatus($fileProperties, $strip404s = false) {
-
+    public function generateMultiStatus($fileProperties, $strip404s = false)
+    {
         $w = $this->xml->getWriter();
         $w->openMemory();
         $w->contextUri = $this->baseUri;
@@ -1664,7 +1647,6 @@ class Server extends EventEmitter implements LoggerAwareInterface {
         $w->startElement('{DAV:}multistatus');
 
         foreach ($fileProperties as $entry) {
-
             $href = $entry['href'];
             unset($entry['href']);
             if ($strip404s) {
@@ -1675,14 +1657,12 @@ class Server extends EventEmitter implements LoggerAwareInterface {
                 $entry
             );
             $w->write([
-                'name'  => '{DAV:}response',
-                'value' => $response
+                'name' => '{DAV:}response',
+                'value' => $response,
             ]);
         }
         $w->endElement();
 
         return $w->outputMemory();
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/ServerPlugin.php b/vendor/sabre/dav/lib/DAV/ServerPlugin.php
index b2c468ab3..9aefa7f72 100644
--- a/vendor/sabre/dav/lib/DAV/ServerPlugin.php
+++ b/vendor/sabre/dav/lib/DAV/ServerPlugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
@@ -11,8 +13,8 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class ServerPlugin {
-
+abstract class ServerPlugin
+{
     /**
      * This initializes the plugin.
      *
@@ -22,9 +24,8 @@ abstract class ServerPlugin {
      * This method should set up the required event subscriptions.
      *
      * @param Server $server
-     * @return void
      */
-    abstract function initialize(Server $server);
+    abstract public function initialize(Server $server);
 
     /**
      * This method should return a list of server-features.
@@ -34,10 +35,9 @@ abstract class ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return [];
-
     }
 
     /**
@@ -48,12 +48,12 @@ abstract class ServerPlugin {
      * available for the specified uri.
      *
      * @param string $path
+     *
      * @return array
      */
-    function getHTTPMethods($path) {
-
+    public function getHTTPMethods($path)
+    {
         return [];
-
     }
 
     /**
@@ -64,10 +64,9 @@ abstract class ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return get_class($this);
-
     }
 
     /**
@@ -78,12 +77,12 @@ abstract class ServerPlugin {
      * implement them
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getSupportedReportSet($uri) {
-
+    public function getSupportedReportSet($uri)
+    {
         return [];
-
     }
 
     /**
@@ -97,14 +96,12 @@ abstract class ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => null,
-            'link'        => null,
+            'link' => null,
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Sharing/ISharedNode.php b/vendor/sabre/dav/lib/DAV/Sharing/ISharedNode.php
index 034aefbdc..a746ac753 100644
--- a/vendor/sabre/dav/lib/DAV/Sharing/ISharedNode.php
+++ b/vendor/sabre/dav/lib/DAV/Sharing/ISharedNode.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Sharing;
 
 use Sabre\DAV\INode;
@@ -13,8 +15,8 @@ use Sabre\DAV\INode;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ISharedNode extends INode {
-
+interface ISharedNode extends INode
+{
     /**
      * Returns the 'access level' for the instance of this shared resource.
      *
@@ -23,7 +25,7 @@ interface ISharedNode extends INode {
      *
      * @return int
      */
-    function getShareAccess();
+    public function getShareAccess();
 
     /**
      * This function must return a URI that uniquely identifies the shared
@@ -36,7 +38,7 @@ interface ISharedNode extends INode {
      *
      * @return string
      */
-    function getShareResourceUri();
+    public function getShareResourceUri();
 
     /**
      * Updates the list of sharees.
@@ -44,9 +46,8 @@ interface ISharedNode extends INode {
      * Every item must be a Sharee object.
      *
      * @param \Sabre\DAV\Xml\Element\Sharee[] $sharees
-     * @return void
      */
-    function updateInvites(array $sharees);
+    public function updateInvites(array $sharees);
 
     /**
      * Returns the list of people whom this resource is shared with.
@@ -64,6 +65,5 @@ interface ISharedNode extends INode {
      *
      * @return \Sabre\DAV\Xml\Element\Sharee[]
      */
-    function getInvites();
-
+    public function getInvites();
 }
diff --git a/vendor/sabre/dav/lib/DAV/Sharing/Plugin.php b/vendor/sabre/dav/lib/DAV/Sharing/Plugin.php
index ef5702c57..5706fabf1 100644
--- a/vendor/sabre/dav/lib/DAV/Sharing/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Sharing/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Sharing;
 
 use Sabre\DAV\Exception\BadRequest;
@@ -14,7 +16,7 @@ use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
 
 /**
- * This plugin implements HTTP requests and properties related to:
+ * This plugin implements HTTP requests and properties related to:.
  *
  * draft-pot-webdav-resource-sharing
  *
@@ -24,8 +26,8 @@ use Sabre\HTTP\ResponseInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends ServerPlugin {
-
+class Plugin extends ServerPlugin
+{
     const ACCESS_NOTSHARED = 0;
     const ACCESS_SHAREDOWNER = 1;
     const ACCESS_READ = 2;
@@ -52,10 +54,9 @@ class Plugin extends ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return ['resource-sharing'];
-
     }
 
     /**
@@ -66,10 +67,9 @@ class Plugin extends ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'sharing';
-
     }
 
     /**
@@ -81,10 +81,9 @@ class Plugin extends ServerPlugin {
      * This method should set up the required event subscriptions.
      *
      * @param Server $server
-     * @return void
      */
-    function initialize(Server $server) {
-
+    public function initialize(Server $server)
+    {
         $this->server = $server;
 
         $server->xml->elementMap['{DAV:}share-resource'] = 'Sabre\\DAV\\Xml\\Request\\ShareResource';
@@ -94,12 +93,11 @@ class Plugin extends ServerPlugin {
             '{DAV:}share-mode'
         );
 
-        $server->on('method:POST',              [$this, 'httpPost']);
-        $server->on('propFind',                 [$this, 'propFind']);
+        $server->on('method:POST', [$this, 'httpPost']);
+        $server->on('propFind', [$this, 'propFind']);
         $server->on('getSupportedPrivilegeSet', [$this, 'getSupportedPrivilegeSet']);
-        $server->on('onHTMLActionsPanel',       [$this, 'htmlActionsPanel']);
-        $server->on('onBrowserPostAction',      [$this, 'browserPostAction']);
-
+        $server->on('onHTMLActionsPanel', [$this, 'htmlActionsPanel']);
+        $server->on('onBrowserPostAction', [$this, 'browserPostAction']);
     }
 
     /**
@@ -108,18 +106,15 @@ class Plugin extends ServerPlugin {
      * The sharees  array is a list of people that are to be added modified
      * or removed in the list of shares.
      *
-     * @param string $path
+     * @param string   $path
      * @param Sharee[] $sharees
-     * @return void
      */
-    function shareResource($path, array $sharees) {
-
+    public function shareResource($path, array $sharees)
+    {
         $node = $this->server->tree->getNodeForPath($path);
 
         if (!$node instanceof ISharedNode) {
-
             throw new Forbidden('Sharing is not allowed on this node');
-
         }
 
         // Getting ACL info
@@ -138,7 +133,6 @@ class Plugin extends ServerPlugin {
             $sharee->principal = $principal;
         }
         $node->updateInvites($sharees);
-
     }
 
     /**
@@ -147,47 +141,41 @@ class Plugin extends ServerPlugin {
      * This allows us to inject any sharings-specific properties.
      *
      * @param PropFind $propFind
-     * @param INode $node
-     * @return void
+     * @param INode    $node
      */
-    function propFind(PropFind $propFind, INode $node) {
-
+    public function propFind(PropFind $propFind, INode $node)
+    {
         if ($node instanceof ISharedNode) {
-
-            $propFind->handle('{DAV:}share-access', function() use ($node) {
-
+            $propFind->handle('{DAV:}share-access', function () use ($node) {
                 return new Property\ShareAccess($node->getShareAccess());
-
             });
-            $propFind->handle('{DAV:}invite', function() use ($node) {
-
+            $propFind->handle('{DAV:}invite', function () use ($node) {
                 return new Property\Invite($node->getInvites());
-
             });
-            $propFind->handle('{DAV:}share-resource-uri', function() use ($node) {
-
+            $propFind->handle('{DAV:}share-resource-uri', function () use ($node) {
                 return new Property\Href($node->getShareResourceUri());
-
             });
-
         }
-
     }
 
     /**
-     * We intercept this to handle POST requests on shared resources
+     * We intercept this to handle POST requests on shared resources.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return null|bool
+     *
+     * @return bool|null
      */
-    function httpPost(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpPost(RequestInterface $request, ResponseInterface $response)
+    {
         $path = $request->getPath();
         $contentType = $request->getHeader('Content-Type');
+        if (null === $contentType) {
+            return;
+        }
 
         // We're only interested in the davsharing content type.
-        if (strpos($contentType, 'application/davsharing+xml') === false) {
+        if (false === strpos($contentType, 'application/davsharing+xml')) {
             return;
         }
 
@@ -198,7 +186,6 @@ class Plugin extends ServerPlugin {
         );
 
         switch ($documentType) {
-
             case '{DAV:}share-resource':
 
                 $this->shareResource($path, $message->sharees);
@@ -210,11 +197,9 @@ class Plugin extends ServerPlugin {
                 // Breaking the event chain
                 return false;
 
-            default :
-                throw new BadRequest('Unexpected document type: ' . $documentType . ' for this Content-Type');
-
+            default:
+                throw new BadRequest('Unexpected document type: '.$documentType.' for this Content-Type');
         }
-
     }
 
     /**
@@ -226,11 +211,11 @@ class Plugin extends ServerPlugin {
      * @param INode $node
      * @param array $supportedPrivilegeSet
      */
-    function getSupportedPrivilegeSet(INode $node, array &$supportedPrivilegeSet) {
-
+    public function getSupportedPrivilegeSet(INode $node, array &$supportedPrivilegeSet)
+    {
         if ($node instanceof ISharedNode) {
             $supportedPrivilegeSet['{DAV:}share'] = [
-                'abstract'   => false,
+                'abstract' => false,
                 'aggregates' => [],
             ];
         }
@@ -247,27 +232,27 @@ class Plugin extends ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'This plugin implements WebDAV resource sharing',
-            'link'        => 'https://github.com/evert/webdav-sharing'
+            'link' => 'https://github.com/evert/webdav-sharing',
         ];
-
     }
 
     /**
      * This method is used to generate HTML output for the
      * DAV\Browser\Plugin.
      *
-     * @param INode $node
+     * @param INode  $node
      * @param string $output
      * @param string $path
+     *
      * @return bool|null
      */
-    function htmlActionsPanel(INode $node, &$output, $path) {
-
+    public function htmlActionsPanel(INode $node, &$output, $path)
+    {
         if (!$node instanceof ISharedNode) {
             return;
         }
@@ -293,7 +278,6 @@ class Plugin extends ServerPlugin {
              <input type="submit" value="share" />
             </form>
             </td></tr>';
-
     }
 
     /**
@@ -302,11 +286,11 @@ class Plugin extends ServerPlugin {
      *
      * @param string $path
      * @param string $action
-     * @param array $postVars
+     * @param array  $postVars
      */
-    function browserPostAction($path, $action, $postVars) {
-
-        if ($action !== 'share') {
+    public function browserPostAction($path, $action, $postVars)
+    {
+        if ('share' !== $action) {
             return;
         }
 
@@ -319,7 +303,7 @@ class Plugin extends ServerPlugin {
 
         $accessMap = [
             'readwrite' => self::ACCESS_READWRITE,
-            'read'      => self::ACCESS_READ,
+            'read' => self::ACCESS_READ,
             'no-access' => self::ACCESS_NOACCESS,
         ];
 
@@ -327,7 +311,7 @@ class Plugin extends ServerPlugin {
             throw new BadRequest('The "access" POST must be readwrite, read or no-access');
         }
         $sharee = new Sharee([
-            'href'   => $postVars['href'],
+            'href' => $postVars['href'],
             'access' => $accessMap[$postVars['access']],
         ]);
 
@@ -335,8 +319,7 @@ class Plugin extends ServerPlugin {
             $path,
             [$sharee]
         );
-        return false;
 
+        return false;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/SimpleCollection.php b/vendor/sabre/dav/lib/DAV/SimpleCollection.php
index 998cfcbff..1fbb6982d 100644
--- a/vendor/sabre/dav/lib/DAV/SimpleCollection.php
+++ b/vendor/sabre/dav/lib/DAV/SimpleCollection.php
@@ -1,9 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
+use InvalidArgumentException;
+
 /**
- * SimpleCollection
+ * SimpleCollection.
  *
  * The SimpleCollection is used to quickly setup static directory structures.
  * Just create the object with a proper name, and add children to use it.
@@ -12,64 +16,64 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SimpleCollection extends Collection {
-
+class SimpleCollection extends Collection
+{
     /**
-     * List of childnodes
+     * List of childnodes.
      *
      * @var INode[]
      */
     protected $children = [];
 
     /**
-     * Name of this resource
+     * Name of this resource.
      *
      * @var string
      */
     protected $name;
 
     /**
-     * Creates this node
+     * Creates this node.
      *
      * The name of the node must be passed, child nodes can also be passed.
      * This nodes must be instances of INode
      *
-     * @param string $name
+     * @param string  $name
      * @param INode[] $children
      */
-    function __construct($name, array $children = []) {
-
+    public function __construct($name, array $children = [])
+    {
         $this->name = $name;
-        foreach ($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');
+        foreach ($children as $key => $child) {
+            if (is_string($child)) {
+                $child = new SimpleFile($key, $child);
+            } elseif (is_array($child)) {
+                $child = new self($key, $child);
+            } elseif (!$child instanceof INode) {
+                throw new InvalidArgumentException('Children must be specified as strings, arrays or instances of Sabre\DAV\INode');
+            }
             $this->addChild($child);
-
         }
-
     }
 
     /**
-     * Adds a new childnode to this collection
+     * Adds a new childnode to this collection.
      *
      * @param INode $child
-     * @return void
      */
-    function addChild(INode $child) {
-
+    public function addChild(INode $child)
+    {
         $this->children[$child->getName()] = $child;
-
     }
 
     /**
-     * Returns the name of the collection
+     * Returns the name of the collection.
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return $this->name;
-
     }
 
     /**
@@ -82,26 +86,26 @@ class SimpleCollection extends Collection {
      * exist.
      *
      * @param string $name
+     *
      * @throws Exception\NotFound
+     *
      * @return INode
      */
-    function getChild($name) {
-
-        if (isset($this->children[$name])) return $this->children[$name];
-        throw new Exception\NotFound('File not found: ' . $name . ' in \'' . $this->getName() . '\'');
-
+    public function getChild($name)
+    {
+        if (isset($this->children[$name])) {
+            return $this->children[$name];
+        }
+        throw new Exception\NotFound('File not found: '.$name.' in \''.$this->getName().'\'');
     }
 
     /**
-     * Returns a list of children for this collection
+     * Returns a list of children for this collection.
      *
      * @return INode[]
      */
-    function getChildren() {
-
+    public function getChildren()
+    {
         return array_values($this->children);
-
     }
-
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/SimpleFile.php b/vendor/sabre/dav/lib/DAV/SimpleFile.php
index bcad786f3..ca808b672 100644
--- a/vendor/sabre/dav/lib/DAV/SimpleFile.php
+++ b/vendor/sabre/dav/lib/DAV/SimpleFile.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * SimpleFile
+ * SimpleFile.
  *
  * The 'SimpleFile' class is used to easily add read-only immutable files to
  * the directory structure. One usecase would be to add a 'readme.txt' to a
@@ -13,45 +15,44 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SimpleFile extends File {
-
+class SimpleFile extends File
+{
     /**
-     * File contents
+     * File contents.
      *
      * @var string
      */
     protected $contents = [];
 
     /**
-     * Name of this resource
+     * Name of this resource.
      *
      * @var string
      */
     protected $name;
 
     /**
-     * A mimetype, such as 'text/plain' or 'text/html'
+     * A mimetype, such as 'text/plain' or 'text/html'.
      *
      * @var string
      */
     protected $mimeType;
 
     /**
-     * Creates this node
+     * Creates this node.
      *
      * The name of the node must be passed, as well as the contents of the
      * file.
      *
-     * @param string $name
-     * @param string $contents
+     * @param string      $name
+     * @param string      $contents
      * @param string|null $mimeType
      */
-    function __construct($name, $contents, $mimeType = null) {
-
+    public function __construct($name, $contents, $mimeType = null)
+    {
         $this->name = $name;
         $this->contents = $contents;
         $this->mimeType = $mimeType;
-
     }
 
     /**
@@ -61,23 +62,21 @@ class SimpleFile extends File {
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return $this->name;
-
     }
 
     /**
-     * Returns the data
+     * Returns the data.
      *
      * This method may either return a string or a readable stream resource
      *
      * @return mixed
      */
-    function get() {
-
+    public function get()
+    {
         return $this->contents;
-
     }
 
     /**
@@ -85,37 +84,35 @@ class SimpleFile extends File {
      *
      * @return int
      */
-    function getSize() {
-
+    public function getSize()
+    {
         return strlen($this->contents);
-
     }
 
     /**
-     * Returns the ETag for a file
+     * Returns the ETag for a file.
      *
      * An ETag is a unique identifier representing the current version of the file. If the file changes, the ETag MUST change.
      * The ETag is an arbitrary string, but MUST be surrounded by double-quotes.
      *
      * Return null if the ETag can not effectively be determined
+     *
      * @return string
      */
-    function getETag() {
-
-        return '"' . sha1($this->contents) . '"';
-
+    public function getETag()
+    {
+        return '"'.sha1($this->contents).'"';
     }
 
     /**
-     * Returns the mime-type for a file
+     * Returns the mime-type for a file.
      *
      * If null is returned, we'll assume application/octet-stream
+     *
      * @return string
      */
-    function getContentType() {
-
+    public function getContentType()
+    {
         return $this->mimeType;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/StringUtil.php b/vendor/sabre/dav/lib/DAV/StringUtil.php
index 10eecebfd..13a4399e3 100644
--- a/vendor/sabre/dav/lib/DAV/StringUtil.php
+++ b/vendor/sabre/dav/lib/DAV/StringUtil.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * String utility
+ * String utility.
  *
  * This class is mainly used to implement the 'text-match' filter, used by both
  * the CalDAV calendar-query REPORT, and CardDAV addressbook-query REPORT.
@@ -13,79 +15,74 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class StringUtil {
-
+class StringUtil
+{
     /**
-     * Checks if a needle occurs in a haystack ;)
+     * Checks if a needle occurs in a haystack ;).
      *
      * @param string $haystack
      * @param string $needle
      * @param string $collation
      * @param string $matchType
+     *
      * @return bool
      */
-    static function textMatch($haystack, $needle, $collation, $matchType = 'contains') {
-
+    public static function textMatch($haystack, $needle, $collation, $matchType = 'contains')
+    {
         switch ($collation) {
-
-            case 'i;ascii-casemap' :
+            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);
                 break;
 
-            case 'i;octet' :
+            case 'i;octet':
                 // Do nothing
                 break;
 
-            case 'i;unicode-casemap' :
+            case 'i;unicode-casemap':
                 $haystack = mb_strtoupper($haystack, 'UTF-8');
                 $needle = mb_strtoupper($needle, 'UTF-8');
                 break;
 
-            default :
-                throw new Exception\BadRequest('Collation type: ' . $collation . ' is not supported');
-
+            default:
+                throw new Exception\BadRequest('Collation type: '.$collation.' is not supported');
         }
 
         switch ($matchType) {
-
-            case 'contains' :
-                return strpos($haystack, $needle) !== false;
-            case 'equals' :
+            case 'contains':
+                return false !== strpos($haystack, $needle);
+            case 'equals':
                 return $haystack === $needle;
-            case 'starts-with' :
-                return strpos($haystack, $needle) === 0;
-            case 'ends-with' :
+            case 'starts-with':
+                return 0 === strpos($haystack, $needle);
+            case 'ends-with':
                 return strrpos($haystack, $needle) === strlen($haystack) - strlen($needle);
-            default :
-                throw new Exception\BadRequest('Match-type: ' . $matchType . ' is not supported');
-
+            default:
+                throw new Exception\BadRequest('Match-type: '.$matchType.' is not supported');
         }
-
     }
 
     /**
      * This method takes an input string, checks if it's not valid UTF-8 and
      * attempts to convert it to UTF-8 if it's not.
      *
-     * Note that currently this can only convert ISO-8559-1 to UTF-8 (latin-1),
+     * Note that currently this can only convert ISO-8859-1 to UTF-8 (latin-1),
      * anything else will likely fail.
      *
      * @param string $input
+     *
      * @return string
      */
-    static function ensureUTF8($input) {
-
+    public static function ensureUTF8($input)
+    {
         $encoding = mb_detect_encoding($input, ['UTF-8', 'ISO-8859-1'], true);
 
-        if ($encoding === 'ISO-8859-1') {
+        if ('ISO-8859-1' === $encoding) {
             return utf8_encode($input);
         } else {
             return $input;
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Sync/ISyncCollection.php b/vendor/sabre/dav/lib/DAV/Sync/ISyncCollection.php
index d3dc28a80..4ca69dc89 100644
--- a/vendor/sabre/dav/lib/DAV/Sync/ISyncCollection.php
+++ b/vendor/sabre/dav/lib/DAV/Sync/ISyncCollection.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Sync;
 
 use Sabre\DAV;
@@ -15,8 +17,8 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface ISyncCollection extends DAV\ICollection {
-
+interface ISyncCollection extends DAV\ICollection
+{
     /**
      * This method returns the current sync-token for this collection.
      * This can be any string.
@@ -26,7 +28,7 @@ interface ISyncCollection extends DAV\ICollection {
      *
      * @return string|null
      */
-    function getSyncToken();
+    public function getSyncToken();
 
     /**
      * The getChanges method returns all the changes that have happened, since
@@ -79,10 +81,10 @@ interface ISyncCollection extends DAV\ICollection {
      * The limit is 'suggestive'. You are free to ignore it.
      *
      * @param string $syncToken
-     * @param int $syncLevel
-     * @param int $limit
+     * @param int    $syncLevel
+     * @param int    $limit
+     *
      * @return array
      */
-    function getChanges($syncToken, $syncLevel, $limit = null);
-
+    public function getChanges($syncToken, $syncLevel, $limit = null);
 }
diff --git a/vendor/sabre/dav/lib/DAV/Sync/Plugin.php b/vendor/sabre/dav/lib/DAV/Sync/Plugin.php
index 8e4b1aa64..f76827fe3 100644
--- a/vendor/sabre/dav/lib/DAV/Sync/Plugin.php
+++ b/vendor/sabre/dav/lib/DAV/Sync/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Sync;
 
 use Sabre\DAV;
@@ -18,10 +20,10 @@ use Sabre\HTTP\RequestInterface;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends DAV\ServerPlugin {
-
+class Plugin extends DAV\ServerPlugin
+{
     /**
-     * Reference to server object
+     * Reference to server object.
      *
      * @var DAV\Server
      */
@@ -37,10 +39,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'sync';
-
     }
 
     /**
@@ -49,28 +50,25 @@ class Plugin extends DAV\ServerPlugin {
      * This is when the plugin registers it's hooks.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public 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') {
+        $server->on('report', function ($reportName, $dom, $uri) use ($self) {
+            if ('{DAV:}sync-collection' === $reportName) {
                 $this->server->transactionType = 'report-sync-collection';
                 $self->syncCollection($uri, $dom);
+
                 return false;
             }
-
         });
 
-        $server->on('propFind',       [$this, 'propFind']);
+        $server->on('propFind', [$this, 'propFind']);
         $server->on('validateTokens', [$this, 'validateTokens']);
-
     }
 
     /**
@@ -81,10 +79,11 @@ class Plugin extends DAV\ServerPlugin {
      * implement them
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getSupportedReportSet($uri) {
-
+    public function getSupportedReportSet($uri)
+    {
         $node = $this->server->tree->getNodeForPath($uri);
         if ($node instanceof ISyncCollection && $node->getSyncToken()) {
             return [
@@ -93,19 +92,16 @@ class Plugin extends DAV\ServerPlugin {
         }
 
         return [];
-
     }
 
-
     /**
      * This method handles the {DAV:}sync-collection HTTP REPORT.
      *
-     * @param string $uri
+     * @param string               $uri
      * @param SyncCollectionReport $report
-     * @return void
      */
-    function syncCollection($uri, SyncCollectionReport $report) {
-
+    public function syncCollection($uri, SyncCollectionReport $report)
+    {
         // Getting the data
         $node = $this->server->tree->getNodeForPath($uri);
         if (!$node instanceof ISyncCollection) {
@@ -119,19 +115,16 @@ class Plugin extends DAV\ServerPlugin {
         $syncToken = $report->syncToken;
         if (!is_null($syncToken)) {
             // Sync-token must start with our prefix
-            if (substr($syncToken, 0, strlen(self::SYNCTOKEN_PREFIX)) !== self::SYNCTOKEN_PREFIX) {
+            if (self::SYNCTOKEN_PREFIX !== substr($syncToken, 0, strlen(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
@@ -143,7 +136,6 @@ class Plugin extends DAV\ServerPlugin {
             $changeInfo['deleted'],
             $report->properties
         );
-
     }
 
     /**
@@ -151,50 +143,41 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @param string $syncToken
      * @param string $collectionUrl
-     * @param array $added
-     * @param array $modified
-     * @param array $deleted
-     * @param array $properties
-     * @return void
+     * @param array  $added
+     * @param array  $modified
+     * @param array  $deleted
+     * @param array  $properties
      */
-    protected function sendSyncCollectionResponse($syncToken, $collectionUrl, array $added, array $modified, array $deleted, array $properties) {
-
-
+    protected function sendSyncCollectionResponse($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;
+            $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;
+            $fullPath = $collectionUrl.'/'.$item;
             $responses[] = new DAV\Xml\Element\Response($fullPath, [], 404);
-
         }
-        $multiStatus = new DAV\Xml\Response\MultiStatus($responses, self::SYNCTOKEN_PREFIX . $syncToken);
+        $multiStatus = new DAV\Xml\Response\MultiStatus($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())
         );
-
     }
 
     /**
@@ -202,18 +185,17 @@ class Plugin extends DAV\ServerPlugin {
      * We intercept this to see if we must return a {DAV:}sync-token.
      *
      * @param DAV\PropFind $propFind
-     * @param DAV\INode $node
-     * @return void
+     * @param DAV\INode    $node
      */
-    function propFind(DAV\PropFind $propFind, DAV\INode $node) {
-
-        $propFind->handle('{DAV:}sync-token', function() use ($node) {
+    public 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;
-        });
 
+            return self::SYNCTOKEN_PREFIX.$token;
+        });
     }
 
     /**
@@ -223,17 +205,14 @@ class Plugin extends DAV\ServerPlugin {
      * in the If: header, and check if they are valid.
      *
      * @param RequestInterface $request
-     * @param array $conditions
-     * @return void
+     * @param array            $conditions
      */
-    function validateTokens(RequestInterface $request, &$conditions) {
-
+    public 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) {
+                if (self::SYNCTOKEN_PREFIX !== substr($token['token'], 0, strlen(self::SYNCTOKEN_PREFIX))) {
                     continue;
                 }
 
@@ -246,11 +225,8 @@ class Plugin extends DAV\ServerPlugin {
                 ) {
                     $conditions[$kk]['tokens'][$ii]['validToken'] = true;
                 }
-
             }
-
         }
-
     }
 
     /**
@@ -264,14 +240,12 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Adds support for WebDAV Collection Sync (rfc6578)',
-            'link'        => 'http://sabre.io/dav/sync/',
+            'link' => 'http://sabre.io/dav/sync/',
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/TemporaryFileFilterPlugin.php b/vendor/sabre/dav/lib/DAV/TemporaryFileFilterPlugin.php
index 7b453d105..6cf772f44 100644
--- a/vendor/sabre/dav/lib/DAV/TemporaryFileFilterPlugin.php
+++ b/vendor/sabre/dav/lib/DAV/TemporaryFileFilterPlugin.php
@@ -1,13 +1,15 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 use Sabre\HTTP\RequestInterface;
 use Sabre\HTTP\ResponseInterface;
-use Sabre\HTTP\URLUtil;
+use Sabre\Uri;
 
 /**
- * Temporary File Filter Plugin
+ * Temporary File Filter Plugin.
  *
  * The purpose of this filter is to intercept some of the garbage files
  * operation systems and applications tend to generate when mounting
@@ -30,8 +32,8 @@ use Sabre\HTTP\URLUtil;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class TemporaryFileFilterPlugin extends ServerPlugin {
-
+class TemporaryFileFilterPlugin extends ServerPlugin
+{
     /**
      * This is the list of patterns we intercept.
      * If new patterns are added, they must be valid patterns for preg_match.
@@ -49,7 +51,7 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
     ];
 
     /**
-     * A reference to the main Server class
+     * A reference to the main Server class.
      *
      * @var \Sabre\DAV\Server
      */
@@ -72,58 +74,61 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      *
      * @param string|null $dataDir
      */
-    function __construct($dataDir = null) {
-
-        if (!$dataDir) $dataDir = ini_get('session.save_path') . '/sabredav/';
-        if (!is_dir($dataDir)) mkdir($dataDir);
+    public function __construct($dataDir = null)
+    {
+        if (!$dataDir) {
+            $dataDir = ini_get('session.save_path').'/sabredav/';
+        }
+        if (!is_dir($dataDir)) {
+            mkdir($dataDir);
+        }
         $this->dataDir = $dataDir;
-
     }
 
     /**
-     * Initialize the plugin
+     * Initialize the plugin.
      *
      * This is called automatically be the Server class after this plugin is
      * added with Sabre\DAV\Server::addPlugin()
      *
      * @param Server $server
-     * @return void
      */
-    function initialize(Server $server) {
-
+    public function initialize(Server $server)
+    {
         $this->server = $server;
-        $server->on('beforeMethod',    [$this, 'beforeMethod']);
+        $server->on('beforeMethod:*', [$this, 'beforeMethod']);
         $server->on('beforeCreateFile', [$this, 'beforeCreateFile']);
-
     }
 
     /**
-     * This method is called before any HTTP method handler
+     * This method is called before any HTTP method handler.
      *
      * This method intercepts any GET, DELETE, PUT and PROPFIND calls to
      * filenames that are known to match the 'temporary file' regex.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function beforeMethod(RequestInterface $request, ResponseInterface $response) {
-
-        if (!$tempLocation = $this->isTempFile($request->getPath()))
+    public function beforeMethod(RequestInterface $request, ResponseInterface $response)
+    {
+        if (!$tempLocation = $this->isTempFile($request->getPath())) {
             return;
+        }
 
         switch ($request->getMethod()) {
-            case 'GET' :
+            case 'GET':
                 return $this->httpGet($request, $response, $tempLocation);
-            case 'PUT' :
+            case 'PUT':
                 return $this->httpPut($request, $response, $tempLocation);
-            case 'PROPFIND' :
+            case 'PROPFIND':
                 return $this->httpPropfind($request, $response, $tempLocation);
-            case 'DELETE' :
+            case 'DELETE':
                 return $this->httpDelete($request, $response, $tempLocation);
         }
-        return;
 
+        return;
     }
 
     /**
@@ -132,24 +137,25 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      * This is used to deal with HTTP LOCK requests which create a new
      * file.
      *
-     * @param string $uri
-     * @param resource $data
+     * @param string      $uri
+     * @param resource    $data
      * @param ICollection $parent
-     * @param bool $modified Should be set to true, if this event handler
-     *                       changed &$data.
+     * @param bool        $modified should be set to true, if this event handler
+     *                              changed &$data
+     *
      * @return bool
      */
-    function beforeCreateFile($uri, $data, ICollection $parent, $modified) {
-
+    public function beforeCreateFile($uri, $data, ICollection $parent, $modified)
+    {
         if ($tempPath = $this->isTempFile($uri)) {
-
             $hR = $this->server->httpResponse;
             $hR->setHeader('X-Sabre-Temp', 'true');
             file_put_contents($tempPath, $data);
+
             return false;
         }
-        return;
 
+        return;
     }
 
     /**
@@ -158,71 +164,76 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      * temporary file storage.
      *
      * @param string $path
+     *
      * @return bool|string
      */
-    protected function isTempFile($path) {
-
+    protected function isTempFile($path)
+    {
         // We're only interested in the basename.
-        list(, $tempPath) = URLUtil::splitPath($path);
+        list(, $tempPath) = Uri\split($path);
 
-        foreach ($this->temporaryFilePatterns as $tempFile) {
+        if (null === $tempPath) {
+            return false;
+        }
 
+        foreach ($this->temporaryFilePatterns as $tempFile) {
             if (preg_match($tempFile, $tempPath)) {
-                return $this->getDataDir() . '/sabredav_' . md5($path) . '.tempfile';
+                return $this->getDataDir().'/sabredav_'.md5($path).'.tempfile';
             }
-
         }
 
         return false;
-
     }
 
-
     /**
      * This method handles the GET method for temporary files.
      * 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 RequestInterface  $request
      * @param ResponseInterface $hR
-     * @param string $tempLocation
+     * @param string            $tempLocation
+     *
      * @return bool
      */
-    function httpGet(RequestInterface $request, ResponseInterface $hR, $tempLocation) {
-
-        if (!file_exists($tempLocation)) return;
+    public function httpGet(RequestInterface $request, ResponseInterface $hR, $tempLocation)
+    {
+        if (!file_exists($tempLocation)) {
+            return;
+        }
 
         $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;
 
+        return false;
     }
 
     /**
      * This method handles the PUT method.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $hR
-     * @param string $tempLocation
+     * @param string            $tempLocation
+     *
      * @return bool
      */
-    function httpPut(RequestInterface $request, ResponseInterface $hR, $tempLocation) {
-
+    public function httpPut(RequestInterface $request, ResponseInterface $hR, $tempLocation)
+    {
         $hR->setHeader('X-Sabre-Temp', 'true');
 
         $newFile = !file_exists($tempLocation);
 
         if (!$newFile && ($this->server->httpRequest->getHeader('If-None-Match'))) {
-             throw new Exception\PreconditionFailed('The resource already exists, and an If-None-Match header was supplied');
+            throw new Exception\PreconditionFailed('The resource already exists, and an If-None-Match header was supplied');
         }
 
         file_put_contents($tempLocation, $this->server->httpRequest->getBody());
         $hR->setStatus($newFile ? 201 : 200);
-        return false;
 
+        return false;
     }
 
     /**
@@ -231,20 +242,23 @@ 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 RequestInterface  $request
      * @param ResponseInterface $hR
-     * @param string $tempLocation
+     * @param string            $tempLocation
+     *
      * @return bool
      */
-    function httpDelete(RequestInterface $request, ResponseInterface $hR, $tempLocation) {
-
-        if (!file_exists($tempLocation)) return;
+    public function httpDelete(RequestInterface $request, ResponseInterface $hR, $tempLocation)
+    {
+        if (!file_exists($tempLocation)) {
+            return;
+        }
 
         unlink($tempLocation);
         $hR->setHeader('X-Sabre-Temp', 'true');
         $hR->setStatus(204);
-        return false;
 
+        return false;
     }
 
     /**
@@ -254,14 +268,17 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
      * for which properties were requested, and just sends back a default
      * set of properties.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $hR
-     * @param string $tempLocation
+     * @param string            $tempLocation
+     *
      * @return bool
      */
-    function httpPropfind(RequestInterface $request, ResponseInterface $hR, $tempLocation) {
-
-        if (!file_exists($tempLocation)) return;
+    public function httpPropfind(RequestInterface $request, ResponseInterface $hR, $tempLocation)
+    {
+        if (!file_exists($tempLocation)) {
+            return;
+        }
 
         $hR->setHeader('X-Sabre-Temp', 'true');
         $hR->setStatus(207);
@@ -269,22 +286,20 @@ class TemporaryFileFilterPlugin extends ServerPlugin {
 
         $properties = [
             'href' => $request->getPath(),
-            200    => [
-                '{DAV:}getlastmodified'                 => new Xml\Property\GetLastModified(filemtime($tempLocation)),
-                '{DAV:}getcontentlength'                => filesize($tempLocation),
-                '{DAV:}resourcetype'                    => new Xml\Property\ResourceType(null),
-                '{' . Server::NS_SABREDAV . '}tempFile' => true,
-
+            200 => [
+                '{DAV:}getlastmodified' => new Xml\Property\GetLastModified(filemtime($tempLocation)),
+                '{DAV:}getcontentlength' => filesize($tempLocation),
+                '{DAV:}resourcetype' => new Xml\Property\ResourceType(null),
+                '{'.Server::NS_SABREDAV.'}tempFile' => true,
             ],
         ];
 
         $data = $this->server->generateMultiStatus([$properties]);
         $hR->setBody($data);
-        return false;
 
+        return false;
     }
 
-
     /**
      * This method returns the directory where the temporary files should be stored.
      *
diff --git a/vendor/sabre/dav/lib/DAV/Tree.php b/vendor/sabre/dav/lib/DAV/Tree.php
index 7c04f0915..7a5a25f87 100644
--- a/vendor/sabre/dav/lib/DAV/Tree.php
+++ b/vendor/sabre/dav/lib/DAV/Tree.php
@@ -1,8 +1,10 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
-use Sabre\HTTP\URLUtil;
+use Sabre\Uri;
 
 /**
  * The tree object is responsible for basic tree operations.
@@ -14,10 +16,10 @@ use Sabre\HTTP\URLUtil;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Tree {
-
+class Tree
+{
     /**
-     * The root node
+     * The root node.
      *
      * @var ICollection
      */
@@ -32,28 +34,30 @@ class Tree {
     protected $cache = [];
 
     /**
-     * Creates the object
+     * Creates the object.
      *
      * This method expects the rootObject to be passed as a parameter
      *
      * @param ICollection $rootNode
      */
-    function __construct(ICollection $rootNode) {
-
+    public function __construct(ICollection $rootNode)
+    {
         $this->rootNode = $rootNode;
-
     }
 
     /**
-     * Returns the INode object for the requested path
+     * Returns the INode object for the requested path.
      *
      * @param string $path
+     *
      * @return INode
      */
-    function getNodeForPath($path) {
-
+    public function getNodeForPath($path)
+    {
         $path = trim($path, '/');
-        if (isset($this->cache[$path])) return $this->cache[$path];
+        if (isset($this->cache[$path])) {
+            return $this->cache[$path];
+        }
 
         // Is it the root node?
         if (!strlen($path)) {
@@ -61,25 +65,24 @@ class Tree {
         }
 
         // Attempting to fetch its parent
-        list($parentName, $baseName) = URLUtil::splitPath($path);
+        list($parentName, $baseName) = Uri\split($path);
 
         // If there was no parent, we must simply ask it from the root node.
-        if ($parentName === "") {
+        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: ' . $path);
-
+            if (!($parent instanceof ICollection)) {
+                throw new Exception\NotFound('Could not find node at path: '.$path);
+            }
             $node = $parent->getChild($baseName);
-
         }
 
         $this->cache[$path] = $node;
-        return $node;
 
+        return $node;
     }
 
     /**
@@ -89,61 +92,64 @@ class Tree {
      * it cheaper.
      *
      * @param string $path
+     *
      * @return bool
      */
-    function nodeExists($path) {
-
+    public function nodeExists($path)
+    {
         try {
-
             // The root always exists
-            if ($path === '') return true;
+            if ('' === $path) {
+                return true;
+            }
 
-            list($parent, $base) = URLUtil::splitPath($path);
+            list($parent, $base) = Uri\split($path);
 
             $parentNode = $this->getNodeForPath($parent);
-            if (!$parentNode instanceof ICollection) return false;
-            return $parentNode->childExists($base);
+            if (!$parentNode instanceof ICollection) {
+                return false;
+            }
 
+            return $parentNode->childExists($base);
         } catch (Exception\NotFound $e) {
-
             return false;
-
         }
-
     }
 
     /**
-     * Copies a file from path to another
+     * Copies a file from path to another.
      *
-     * @param string $sourcePath The source location
+     * @param string $sourcePath      The source location
      * @param string $destinationPath The full destination path
-     * @return void
      */
-    function copy($sourcePath, $destinationPath) {
-
+    public function copy($sourcePath, $destinationPath)
+    {
         $sourceNode = $this->getNodeForPath($sourcePath);
 
         // grab the dirname and basename components
-        list($destinationDir, $destinationName) = URLUtil::splitPath($destinationPath);
+        list($destinationDir, $destinationName) = Uri\split($destinationPath);
 
         $destinationParent = $this->getNodeForPath($destinationDir);
-        $this->copyNode($sourceNode, $destinationParent, $destinationName);
+        // Check if the target can handle the copy itself. If not, we do it ourselves.
+        if (!$destinationParent instanceof ICopyTarget || !$destinationParent->copyInto($destinationName, $sourcePath, $sourceNode)) {
+            $this->copyNode($sourceNode, $destinationParent, $destinationName);
+        }
 
         $this->markDirty($destinationDir);
-
     }
 
     /**
-     * Moves a file from one location to another
+     * Moves a file from one location to another.
      *
-     * @param string $sourcePath The path to the file which should be moved
+     * @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);
+    public function move($sourcePath, $destinationPath)
+    {
+        list($sourceDir) = Uri\split($sourcePath);
+        list($destinationDir, $destinationName) = Uri\split($destinationPath);
 
         if ($sourceDir === $destinationDir) {
             // If this is a 'local' rename, it means we can just trigger a rename.
@@ -164,49 +170,45 @@ class Tree {
         }
         $this->markDirty($sourceDir);
         $this->markDirty($destinationDir);
-
     }
 
     /**
-     * Deletes a node from the tree
+     * Deletes a node from the tree.
      *
      * @param string $path
-     * @return void
      */
-    function delete($path) {
-
+    public function delete($path)
+    {
         $node = $this->getNodeForPath($path);
         $node->delete();
 
-        list($parent) = URLUtil::splitPath($path);
+        list($parent) = Uri\split($path);
         $this->markDirty($parent);
-
     }
 
     /**
      * Returns a list of childnodes for a given path.
      *
      * @param string $path
-     * @return array
+     *
+     * @return \Traversable
      */
-    function getChildren($path) {
-
+    public 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;
-
+        if ('' !== $basePath) {
+            $basePath .= '/';
         }
-        return $children;
 
+        foreach ($node->getChildren() as $child) {
+            $this->cache[$basePath.$child->getName()] = $child;
+            yield $child;
+        }
     }
 
     /**
-     * This method is called with every tree update
+     * This method is called with every tree update.
      *
      * Examples of tree updates are:
      *   * node deletions
@@ -221,19 +223,17 @@ class Tree {
      * If a path is passed, it is assumed that the entire subtree is dirty
      *
      * @param string $path
-     * @return void
      */
-    function markDirty($path) {
-
+    public function markDirty($path)
+    {
         // We don't care enough about sub-paths
         // flushing the entire cache
         $path = trim($path, '/');
         foreach ($this->cache as $nodePath => $node) {
-            if ($path === '' || $nodePath == $path || strpos($nodePath, $path . '/') === 0)
+            if ('' === $path || $nodePath == $path || 0 === strpos($nodePath, $path.'/')) {
                 unset($this->cache[$nodePath]);
-
+            }
         }
-
     }
 
     /**
@@ -247,15 +247,16 @@ class Tree {
      * 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.
+     * @param array $paths list of nodes that must be fetched
+     *
      * @return array
      */
-    function getMultipleNodes($paths) {
-
+    public function getMultipleNodes($paths)
+    {
         // Finding common parents
         $parents = [];
         foreach ($paths as $path) {
-            list($parent, $node) = URLUtil::splitPath($path);
+            list($parent, $node) = Uri\split($path);
             if (!isset($parents[$parent])) {
                 $parents[$parent] = [$node];
             } else {
@@ -266,44 +267,38 @@ class Tree {
         $result = [];
 
         foreach ($parents as $parent => $children) {
-
             $parentNode = $this->getNodeForPath($parent);
             if ($parentNode instanceof IMultiGet) {
                 foreach ($parentNode->getMultipleChildren($children) as $childNode) {
-                    $fullPath = $parent . '/' . $childNode->getName();
+                    $fullPath = $parent.'/'.$childNode->getName();
                     $result[$fullPath] = $childNode;
                     $this->cache[$fullPath] = $childNode;
                 }
             } else {
                 foreach ($children as $child) {
-                    $fullPath = $parent . '/' . $child;
+                    $fullPath = $parent.'/'.$child;
                     $result[$fullPath] = $this->getNodeForPath($fullPath);
                 }
             }
-
         }
 
         return $result;
-
     }
 
-
     /**
-     * copyNode
+     * copyNode.
      *
-     * @param INode $source
+     * @param INode       $source
      * @param ICollection $destinationParent
-     * @param string $destinationName
-     * @return void
+     * @param string      $destinationName
      */
-    protected function copyNode(INode $source, ICollection $destinationParent, $destinationName = null) {
-
-        if ((string)$destinationName === '') {
+    protected function copyNode(INode $source, ICollection $destinationParent, $destinationName = null)
+    {
+        if ('' === (string) $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
@@ -315,28 +310,19 @@ class Tree {
             }
             $destinationParent->createFile($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/DAV/UUIDUtil.php b/vendor/sabre/dav/lib/DAV/UUIDUtil.php
index 177adafd3..8c36e1b0b 100644
--- a/vendor/sabre/dav/lib/DAV/UUIDUtil.php
+++ b/vendor/sabre/dav/lib/DAV/UUIDUtil.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
- * UUID Utility
+ * UUID Utility.
  *
  * This class has static methods to generate and validate UUID's.
  * UUIDs are used a decent amount within various *DAV standards, so it made
@@ -13,18 +15,19 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class UUIDUtil {
-
+class UUIDUtil
+{
     /**
-     * Returns a pseudo-random v4 UUID
+     * Returns a pseudo-random v4 UUID.
      *
      * This function is based on a comment by Andrew Moore on php.net
      *
      * @see http://www.php.net/manual/en/function.uniqid.php#94959
+     *
      * @return string
      */
-    static function getUUID() {
-
+    public static function getUUID()
+    {
         return sprintf('%04x%04x-%04x-%04x-%04x-%04x%04x%04x',
             // 32 bits for "time_low"
             mt_rand(0, 0xffff), mt_rand(0, 0xffff),
@@ -50,15 +53,14 @@ class UUIDUtil {
      * Checks if a string is a valid UUID.
      *
      * @param string $uuid
+     *
      * @return bool
      */
-    static function validateUUID($uuid) {
-
-        return preg_match(
+    public static function validateUUID($uuid)
+    {
+        return 0 !== preg_match(
             '/^[a-f0-9]{8}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{4}-[a-f0-9]{12}$/i',
             $uuid
-        ) !== 0;
-
+        );
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Version.php b/vendor/sabre/dav/lib/DAV/Version.php
index 89918e5bc..c00255881 100644
--- a/vendor/sabre/dav/lib/DAV/Version.php
+++ b/vendor/sabre/dav/lib/DAV/Version.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV;
 
 /**
@@ -9,11 +11,10 @@ namespace Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Version {
-
+class Version
+{
     /**
-     * Full version number
+     * Full version number.
      */
-    const VERSION = '3.2.2';
-
+    const VERSION = '4.0.2';
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Element/Prop.php b/vendor/sabre/dav/lib/DAV/Xml/Element/Prop.php
index 71ef03e3f..52a04cf08 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Element/Prop.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Element/Prop.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Element;
 
 use Sabre\DAV\Xml\Property\Complex;
@@ -17,8 +19,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Prop implements XmlDeserializable {
-
+class Prop implements XmlDeserializable
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -38,13 +40,15 @@ class Prop implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         // If there's no children, we don't do anything.
         if ($reader->isEmptyElement) {
             $reader->next();
+
             return [];
         }
 
@@ -52,22 +56,17 @@ class Prop implements XmlDeserializable {
 
         $reader->read();
         do {
-
-            if ($reader->nodeType === Reader::ELEMENT) {
-
+            if (Reader::ELEMENT === $reader->nodeType) {
                 $clark = $reader->getClark();
                 $values[$clark] = self::parseCurrentElement($reader)['value'];
-
             } else {
                 $reader->read();
             }
-
-        } while ($reader->nodeType !== Reader::END_ELEMENT);
+        } while (Reader::END_ELEMENT !== $reader->nodeType);
 
         $reader->read();
 
         return $values;
-
     }
 
     /**
@@ -81,10 +80,11 @@ class Prop implements XmlDeserializable {
      *   * value - The parsed value.
      *
      * @param Reader $reader
+     *
      * @return array
      */
-    private static function parseCurrentElement(Reader $reader) {
-
+    private static function parseCurrentElement(Reader $reader)
+    {
         $name = $reader->getClark();
 
         if (array_key_exists($name, $reader->elementMap)) {
@@ -95,22 +95,20 @@ class Prop implements XmlDeserializable {
                 $value = call_user_func($deserializer, $reader);
             } else {
                 $type = gettype($deserializer);
-                if ($type === 'string') {
-                    $type .= ' (' . $deserializer . ')';
-                } elseif ($type === 'object') {
-                    $type .= ' (' . get_class($deserializer) . ')';
+                if ('string' === $type) {
+                    $type .= ' ('.$deserializer.')';
+                } elseif ('object' === $type) {
+                    $type .= ' ('.get_class($deserializer).')';
                 }
-                throw new \LogicException('Could not use this type as a deserializer: ' . $type);
+                throw new \LogicException('Could not use this type as a deserializer: '.$type);
             }
         } else {
             $value = Complex::xmlDeserialize($reader);
         }
 
         return [
-            'name'  => $name,
+            '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
index ce97ae943..a11091809 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Element/Response.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Element/Response.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Element;
 
 use Sabre\Xml\Element;
@@ -7,7 +9,7 @@ use Sabre\Xml\Reader;
 use Sabre\Xml\Writer;
 
 /**
- * WebDAV {DAV:}response parser
+ * WebDAV {DAV:}response parser.
  *
  * This class parses the {DAV:}response element, as defined in:
  *
@@ -17,17 +19,17 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Response implements Element {
-
+class Response implements Element
+{
     /**
-     * Url for the response
+     * Url for the response.
      *
      * @var string
      */
     protected $href;
 
     /**
-     * Propertylist, ordered by HTTP status code
+     * Propertylist, ordered by HTTP status code.
      *
      * @var array
      */
@@ -57,51 +59,46 @@ class Response implements Element {
      * deleted.
      *
      * @param string $href
-     * @param array $responseProperties
+     * @param array  $responseProperties
      * @param string $httpStatus
      */
-    function __construct($href, array $responseProperties, $httpStatus = null) {
-
+    public function __construct($href, array $responseProperties, $httpStatus = null)
+    {
         $this->href = $href;
         $this->responseProperties = $responseProperties;
         $this->httpStatus = $httpStatus;
-
     }
 
     /**
-     * Returns the url
+     * Returns the url.
      *
      * @return string
      */
-    function getHref() {
-
+    public function getHref()
+    {
         return $this->href;
-
     }
 
     /**
-     * Returns the httpStatus value
+     * Returns the httpStatus value.
      *
      * @return string
      */
-    function getHttpStatus() {
-
+    public function getHttpStatus()
+    {
         return $this->httpStatus;
-
     }
 
     /**
-     * Returns the property list
+     * Returns the property list.
      *
      * @return array
      */
-    function getResponseProperties() {
-
+    public function getResponseProperties()
+    {
         return $this->responseProperties;
-
     }
 
-
     /**
      * The serialize method is called during xml writing.
      *
@@ -115,19 +112,17 @@ class Response implements Element {
      * responsible for closing them.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         if ($status = $this->getHTTPStatus()) {
-            $writer->writeElement('{DAV:}status', 'HTTP/1.1 ' . $status . ' ' . \Sabre\HTTP\Response::$statusCodes[$status]);
+            $writer->writeElement('{DAV:}status', 'HTTP/1.1 '.$status.' '.\Sabre\HTTP\Response::$statusCodes[$status]);
         }
-        $writer->writeElement('{DAV:}href', $writer->contextUri . \Sabre\HTTP\encodePath($this->getHref()));
+        $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;
@@ -135,9 +130,8 @@ class Response implements Element {
             $empty = false;
             $writer->startElement('{DAV:}propstat');
             $writer->writeElement('{DAV:}prop', $properties);
-            $writer->writeElement('{DAV:}status', 'HTTP/1.1 ' . $status . ' ' . \Sabre\HTTP\Response::$statusCodes[$status]);
+            $writer->writeElement('{DAV:}status', 'HTTP/1.1 '.$status.' '.\Sabre\HTTP\Response::$statusCodes[$status]);
             $writer->endElement(); // {DAV:}propstat
-
         }
         if ($empty) {
             /*
@@ -149,12 +143,10 @@ class Response implements Element {
              * no properties.
              */
             $writer->writeElement('{DAV:}propstat', [
-                '{DAV:}prop'   => [],
-                '{DAV:}status' => 'HTTP/1.1 418 ' . \Sabre\HTTP\Response::$statusCodes[418]
+                '{DAV:}prop' => [],
+                '{DAV:}status' => 'HTTP/1.1 418 '.\Sabre\HTTP\Response::$statusCodes[418],
             ]);
-
         }
-
     }
 
     /**
@@ -176,10 +168,11 @@ class Response implements Element {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $reader->pushContext();
 
         $reader->elementMap['{DAV:}propstat'] = 'Sabre\\Xml\\Element\\KeyValue';
@@ -192,16 +185,16 @@ class Response implements Element {
         // 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) {
-
+        $reader->elementMap['{DAV:}prop'] = function (Reader $reader) {
             if ($reader->isEmptyElement) {
                 $reader->next();
+
                 return [];
             }
             $values = [];
             $reader->read();
             do {
-                if ($reader->nodeType === Reader::ELEMENT) {
+                if (Reader::ELEMENT === $reader->nodeType) {
                     $clark = $reader->getClark();
 
                     if ($reader->isEmptyElement) {
@@ -213,10 +206,10 @@ class Response implements Element {
                 } else {
                     $reader->read();
                 }
-            } while ($reader->nodeType !== Reader::END_ELEMENT);
+            } while (Reader::END_ELEMENT !== $reader->nodeType);
             $reader->read();
-            return $values;
 
+            return $values;
         };
         $elems = $reader->parseInnerTree();
         $reader->popContext();
@@ -226,28 +219,24 @@ class Response implements Element {
         $statusCode = null;
 
         foreach ($elems as $elem) {
-
             switch ($elem['name']) {
-
-                case '{DAV:}href' :
+                case '{DAV:}href':
                     $href = $elem['value'];
                     break;
-                case '{DAV:}propstat' :
+                case '{DAV:}propstat':
                     $status = $elem['value']['{DAV:}status'];
-                    list(, $status, ) = explode(' ', $status, 3);
+                    list(, $status) = explode(' ', $status, 3);
                     $properties = isset($elem['value']['{DAV:}prop']) ? $elem['value']['{DAV:}prop'] : [];
-                    if ($properties) $propertyLists[$status] = $properties;
+                    if ($properties) {
+                        $propertyLists[$status] = $properties;
+                    }
                     break;
-                case '{DAV:}status' :
-                    list(, $statusCode, ) = explode(' ', $elem['value'], 3);
+                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/Element/Sharee.php b/vendor/sabre/dav/lib/DAV/Xml/Element/Sharee.php
index e187bf11c..e0db3bf37 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Element/Sharee.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Element/Sharee.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Element;
 
 use Sabre\DAV\Exception\BadRequest;
@@ -18,8 +20,8 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Sharee implements Element {
-
+class Sharee implements Element
+{
     /**
      * A URL. Usually a mailto: address, could also be a principal url.
      * This uniquely identifies the sharee.
@@ -79,24 +81,21 @@ class Sharee implements Element {
     public $inviteStatus;
 
     /**
-     * Creates the object
+     * Creates the object.
      *
      * $properties will be used to populate all internal properties.
      *
      * @param array $properties
      */
-    function __construct(array $properties = []) {
-
+    public function __construct(array $properties = [])
+    {
         foreach ($properties as $k => $v) {
-
             if (property_exists($this, $k)) {
                 $this->$k = $v;
             } else {
-                throw new \InvalidArgumentException('Unknown property: ' . $k);
+                throw new \InvalidArgumentException('Unknown property: '.$k);
             }
-
         }
-
     }
 
     /**
@@ -116,31 +115,28 @@ class Sharee implements Element {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
-
+    public function xmlSerialize(Writer $writer)
+    {
         $writer->write([
             new Href($this->href),
-            '{DAV:}prop'         => $this->properties,
+            '{DAV:}prop' => $this->properties,
             '{DAV:}share-access' => new ShareAccess($this->access),
         ]);
         switch ($this->inviteStatus) {
-            case Plugin::INVITE_NORESPONSE :
+            case Plugin::INVITE_NORESPONSE:
                 $writer->writeElement('{DAV:}invite-noresponse');
                 break;
-            case Plugin::INVITE_ACCEPTED :
+            case Plugin::INVITE_ACCEPTED:
                 $writer->writeElement('{DAV:}invite-accepted');
                 break;
-            case Plugin::INVITE_DECLINED :
+            case Plugin::INVITE_DECLINED:
                 $writer->writeElement('{DAV:}invite-declined');
                 break;
-            case Plugin::INVITE_INVALID :
+            case Plugin::INVITE_INVALID:
                 $writer->writeElement('{DAV:}invite-invalid');
                 break;
         }
-
     }
 
     /**
@@ -162,10 +158,11 @@ class Sharee implements Element {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         // Temporarily override configuration
         $reader->pushContext();
         $reader->elementMap['{DAV:}share-access'] = 'Sabre\DAV\Xml\Property\ShareAccess';
@@ -192,8 +189,7 @@ class Sharee implements Element {
             throw new BadRequest('Every {DAV:}sharee must have a {DAV:}share-access child element');
         }
         $sharee->access = $elems['share-access']->getValue();
-        return $sharee;
 
+        return $sharee;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/Complex.php b/vendor/sabre/dav/lib/DAV/Xml/Property/Complex.php
index 258806e4a..990302054 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/Complex.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/Complex.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\Xml\Element\XmlFragment;
@@ -15,8 +17,8 @@ use Sabre\Xml\Reader;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Complex extends XmlFragment {
-
+class Complex extends XmlFragment
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -36,15 +38,17 @@ class Complex extends XmlFragment {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $xml = $reader->readInnerXml();
 
-        if ($reader->nodeType === Reader::ELEMENT && $reader->isEmptyElement) {
+        if (Reader::ELEMENT === $reader->nodeType && $reader->isEmptyElement) {
             // Easy!
             $reader->next();
+
             return null;
         }
         // Now we have a copy of the inner xml, we need to traverse it to get
@@ -56,21 +60,19 @@ class Complex extends XmlFragment {
         $text = '';
 
         while (true) {
-
             switch ($reader->nodeType) {
-                case Reader::ELEMENT :
+                case Reader::ELEMENT:
                     $nonText = true;
                     $reader->next();
                     continue 2;
-                case Reader::TEXT :
-                case Reader::CDATA :
+                case Reader::TEXT:
+                case Reader::CDATA:
                     $text .= $reader->value;
                     break;
-                case Reader::END_ELEMENT :
+                case Reader::END_ELEMENT:
                     break 2;
             }
             $reader->read();
-
         }
 
         // Make sure we advance the cursor one step further.
@@ -78,12 +80,10 @@ class Complex extends XmlFragment {
 
         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
index 101a0f0c9..05a00c5e5 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/GetLastModified.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/GetLastModified.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use DateTime;
@@ -19,42 +21,40 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class GetLastModified implements Element {
-
+class GetLastModified implements Element
+{
     /**
-     * time
+     * time.
      *
      * @var DateTime
      */
     public $time;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param int|DateTime $time
      */
-    function __construct($time) {
-
+    public function __construct($time)
+    {
         if ($time instanceof DateTime) {
             $this->time = clone $time;
         } else {
-            $this->time = new DateTime('@' . $time);
+            $this->time = new DateTime('@'.$time);
         }
 
         // Setting timezone to UTC
         $this->time->setTimezone(new DateTimeZone('UTC'));
-
     }
 
     /**
-     * getTime
+     * getTime.
      *
      * @return DateTime
      */
-    function getTime() {
-
+    public function getTime()
+    {
         return $this->time;
-
     }
 
     /**
@@ -70,14 +70,12 @@ class GetLastModified implements Element {
      * responsible for closing them.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         $writer->write(
-            HTTP\Util::toHTTPDate($this->time)
+            HTTP\toDate($this->time)
         );
-
     }
 
     /**
@@ -99,12 +97,12 @@ class GetLastModified implements Element {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public 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
index 6c4f11b87..c479c1602 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/Href.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/Href.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\DAV\Browser\HtmlOutput;
@@ -10,7 +12,7 @@ use Sabre\Xml\Reader;
 use Sabre\Xml\Writer;
 
 /**
- * Href property
+ * Href property.
  *
  * This class represents any WebDAV property that contains a {DAV:}href
  * element, and there are many.
@@ -23,17 +25,17 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Href implements Element, HtmlOutput {
-
+class Href implements Element, HtmlOutput
+{
     /**
-     * List of uris
+     * List of uris.
      *
      * @var array
      */
     protected $hrefs;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * You must either pass a string for a single href, or an array of hrefs.
      *
@@ -42,35 +44,32 @@ class Href implements Element, HtmlOutput {
      *
      * @param string|string[] $hrefs
      */
-    function __construct($hrefs) {
-
+    public function __construct($hrefs)
+    {
         if (is_string($hrefs)) {
             $hrefs = [$hrefs];
         }
         $this->hrefs = $hrefs;
-
     }
 
     /**
      * Returns the first Href.
      *
-     * @return string
+     * @return string|null
      */
-    function getHref() {
-
-        return $this->hrefs[0];
-
+    public function getHref()
+    {
+        return $this->hrefs[0] ?? null;
     }
 
     /**
-     * Returns the hrefs as an array
+     * Returns the hrefs as an array.
      *
      * @return array
      */
-    function getHrefs() {
-
+    public function getHrefs()
+    {
         return $this->hrefs;
-
     }
 
     /**
@@ -90,15 +89,13 @@ class Href implements Element, HtmlOutput {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->getHrefs() as $href) {
             $href = Uri\resolve($writer->contextUri, $href);
             $writer->writeElement('{DAV:}href', $href);
         }
-
     }
 
     /**
@@ -113,16 +110,17 @@ class Href implements Element, HtmlOutput {
      * be used to construct local links.
      *
      * @param HtmlOutputHelper $html
+     *
      * @return string
      */
-    function toHtml(HtmlOutputHelper $html) {
-
+    public function toHtml(HtmlOutputHelper $html)
+    {
         $links = [];
         foreach ($this->getHrefs() as $href) {
             $links[] = $html->link($href);
         }
-        return implode('<br />', $links);
 
+        return implode('<br />', $links);
     }
 
     /**
@@ -144,22 +142,21 @@ class Href implements Element, HtmlOutput {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $hrefs = [];
-        foreach ((array)$reader->parseInnerTree() as $elem) {
-            if ($elem['name'] !== '{DAV:}href')
+        foreach ((array) $reader->parseInnerTree() as $elem) {
+            if ('{DAV:}href' !== $elem['name']) {
                 continue;
+            }
 
             $hrefs[] = $elem['value'];
-
         }
         if ($hrefs) {
-            return new self($hrefs, false);
+            return new self($hrefs);
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/Invite.php b/vendor/sabre/dav/lib/DAV/Xml/Property/Invite.php
index 6adad3650..b5e2dae46 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/Invite.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/Invite.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\DAV\Xml\Element\Sharee;
@@ -20,10 +22,10 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Invite implements XmlSerializable {
-
+class Invite implements XmlSerializable
+{
     /**
-     * A list of sharees
+     * A list of sharees.
      *
      * @var Sharee[]
      */
@@ -34,10 +36,9 @@ class Invite implements XmlSerializable {
      *
      * @param Sharee[] $sharees
      */
-    function __construct(array $sharees) {
-
+    public function __construct(array $sharees)
+    {
         $this->sharees = $sharees;
-
     }
 
     /**
@@ -57,14 +58,11 @@ class Invite implements XmlSerializable {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->sharees as $sharee) {
             $writer->writeElement('{DAV:}sharee', $sharee);
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/LocalHref.php b/vendor/sabre/dav/lib/DAV/Xml/Property/LocalHref.php
index 00d2fa708..cb794974f 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/LocalHref.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/LocalHref.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\HTTP;
 
 /**
- * LocalHref property
+ * LocalHref property.
  *
  * Like the Href property, this element represents {DAV:}href. The difference
  * is that this is used strictly for paths on the server. The LocalHref property
@@ -22,10 +24,10 @@ use Sabre\HTTP;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class LocalHref extends Href {
-
+class LocalHref extends Href
+{
     /**
-     * Constructor
+     * Constructor.
      *
      * You must either pass a string for a single href, or an array of hrefs.
      *
@@ -34,15 +36,13 @@ class LocalHref extends Href {
      *
      * @param string|string[] $hrefs
      */
-    function __construct($hrefs) {
-
+    public function __construct($hrefs)
+    {
         parent::__construct(array_map(
-            function($href) {
+            function ($href) {
                 return \Sabre\HTTP\encodePath($href);
             },
-            (array)$hrefs
+            (array) $hrefs
         ));
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/LockDiscovery.php b/vendor/sabre/dav/lib/DAV/Xml/Property/LockDiscovery.php
index f4b692219..c33812b3e 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/LockDiscovery.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/LockDiscovery.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\DAV;
@@ -20,10 +22,10 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class LockDiscovery implements XmlSerializable {
-
+class LockDiscovery implements XmlSerializable
+{
     /**
-     * locks
+     * locks.
      *
      * @var LockInfo[]
      */
@@ -37,17 +39,16 @@ class LockDiscovery implements XmlSerializable {
      *
      * @var bool
      */
-    static $hideLockRoot = false;
+    public static $hideLockRoot = false;
 
     /**
-     * __construct
+     * __construct.
      *
      * @param LockInfo[] $locks
      */
-    function __construct($locks) {
-
+    public function __construct($locks)
+    {
         $this->locks = $locks;
-
     }
 
     /**
@@ -63,16 +64,14 @@ class LockDiscovery implements XmlSerializable {
      * responsible for closing them.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->locks as $lock) {
-
             $writer->startElement('{DAV:}activelock');
 
             $writer->startElement('{DAV:}lockscope');
-            if ($lock->scope === LockInfo::SHARED) {
+            if (LockInfo::SHARED === $lock->scope) {
                 $writer->writeElement('{DAV:}shared');
             } else {
                 $writer->writeElement('{DAV:}exclusive');
@@ -86,21 +85,23 @@ class LockDiscovery implements XmlSerializable {
 
             if (!self::$hideLockRoot) {
                 $writer->startElement('{DAV:}lockroot');
-                $writer->writeElement('{DAV:}href', $writer->contextUri . $lock->uri);
+                $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:}depth', (DAV\Server::DEPTH_INFINITY == $lock->depth ? 'infinity' : $lock->depth));
+            $writer->writeElement('{DAV:}timeout', (LockInfo::TIMEOUT_INFINITE === $lock->timeout ? 'Infinite' : 'Second-'.$lock->timeout));
+
+            // optional according to https://tools.ietf.org/html/rfc4918#section-6.5
+            if (null !== $lock->token && '' !== $lock->token) {
+                $writer->startElement('{DAV:}locktoken');
+                $writer->writeElement('{DAV:}href', 'opaquelocktoken:'.$lock->token);
+                $writer->endElement(); // {DAV:}locktoken
+            }
 
-            $writer->writeElement('{DAV:}owner', new XmlFragment($lock->owner));
+            if ($lock->owner) {
+                $writer->writeElement('{DAV:}owner', new XmlFragment($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
index ce640ff32..ce07d4382 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/ResourceType.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/ResourceType.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\DAV\Browser\HtmlOutput;
@@ -8,7 +10,7 @@ use Sabre\Xml\Element;
 use Sabre\Xml\Reader;
 
 /**
- * {DAV:}resourcetype property
+ * {DAV:}resourcetype property.
  *
  * This class represents the {DAV:}resourcetype property, as defined in:
  *
@@ -18,10 +20,10 @@ use Sabre\Xml\Reader;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ResourceType extends Element\Elements implements HtmlOutput {
-
+class ResourceType extends Element\Elements implements HtmlOutput
+{
     /**
-     * Constructor
+     * Constructor.
      *
      * You can either pass null (for no resourcetype), a string (for a single
      * resourcetype) or an array (for multiple).
@@ -30,48 +32,44 @@ class ResourceType extends Element\Elements implements HtmlOutput {
      *
      * @param array|string|null $resourceTypes
      */
-    function __construct($resourceTypes = null) {
-
-        parent::__construct((array)$resourceTypes);
-
+    public function __construct($resourceTypes = null)
+    {
+        parent::__construct((array) $resourceTypes);
     }
 
     /**
-     * Returns the values in clark-notation
+     * Returns the values in clark-notation.
      *
      * For example array('{DAV:}collection')
      *
      * @return array
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->value;
-
     }
 
     /**
-     * Checks if the principal contains a certain value
+     * Checks if the principal contains a certain value.
      *
      * @param string $type
+     *
      * @return bool
      */
-    function is($type) {
-
+    public function is($type)
+    {
         return in_array($type, $this->value);
-
     }
 
     /**
-     * Adds a resourcetype value to this property
+     * Adds a resourcetype value to this property.
      *
      * @param string $type
-     * @return void
      */
-    function add($type) {
-
+    public function add($type)
+    {
         $this->value[] = $type;
         $this->value = array_unique($this->value);
-
     }
 
     /**
@@ -93,13 +91,13 @@ class ResourceType extends Element\Elements implements HtmlOutput {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         return
             new self(parent::xmlDeserialize($reader));
-
     }
 
     /**
@@ -114,15 +112,14 @@ class ResourceType extends Element\Elements implements HtmlOutput {
      * be used to construct local links.
      *
      * @param HtmlOutputHelper $html
+     *
      * @return string
      */
-    function toHtml(HtmlOutputHelper $html) {
-
+    public function toHtml(HtmlOutputHelper $html)
+    {
         return implode(
             ', ',
             array_map([$html, 'xmlName'], $this->getValue())
         );
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/ShareAccess.php b/vendor/sabre/dav/lib/DAV/Xml/Property/ShareAccess.php
index 939062f76..95175053a 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/ShareAccess.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/ShareAccess.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\DAV\Exception\BadRequest;
@@ -22,10 +24,10 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ShareAccess implements Element {
-
+class ShareAccess implements Element
+{
     /**
-     * Either SHARED or SHAREDOWNER
+     * Either SHARED or SHAREDOWNER.
      *
      * @var int
      */
@@ -39,10 +41,9 @@ class ShareAccess implements Element {
      *
      * @param int $shareAccess
      */
-    function __construct($shareAccess) {
-
+    public function __construct($shareAccess)
+    {
         $this->value = $shareAccess;
-
     }
 
     /**
@@ -50,10 +51,9 @@ class ShareAccess implements Element {
      *
      * @return int
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->value;
-
     }
 
     /**
@@ -73,30 +73,26 @@ class ShareAccess implements Element {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         switch ($this->value) {
-
-            case SharingPlugin::ACCESS_NOTSHARED :
+            case SharingPlugin::ACCESS_NOTSHARED:
                 $writer->writeElement('{DAV:}not-shared');
                 break;
-            case SharingPlugin::ACCESS_SHAREDOWNER :
+            case SharingPlugin::ACCESS_SHAREDOWNER:
                 $writer->writeElement('{DAV:}shared-owner');
                 break;
-            case SharingPlugin::ACCESS_READ :
+            case SharingPlugin::ACCESS_READ:
                 $writer->writeElement('{DAV:}read');
                 break;
-            case SharingPlugin::ACCESS_READWRITE :
+            case SharingPlugin::ACCESS_READWRITE:
                 $writer->writeElement('{DAV:}read-write');
                 break;
-            case SharingPlugin::ACCESS_NOACCESS :
+            case SharingPlugin::ACCESS_NOACCESS:
                 $writer->writeElement('{DAV:}no-access');
                 break;
-
         }
-
     }
 
     /**
@@ -118,26 +114,26 @@ class ShareAccess implements Element {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $elems = $reader->parseInnerTree();
         foreach ($elems as $elem) {
             switch ($elem['name']) {
-                case '{DAV:}not-shared' :
+                case '{DAV:}not-shared':
                     return new self(SharingPlugin::ACCESS_NOTSHARED);
-                case '{DAV:}shared-owner' :
+                case '{DAV:}shared-owner':
                     return new self(SharingPlugin::ACCESS_SHAREDOWNER);
-                case '{DAV:}read' :
+                case '{DAV:}read':
                     return new self(SharingPlugin::ACCESS_READ);
-                case '{DAV:}read-write' :
+                case '{DAV:}read-write':
                     return new self(SharingPlugin::ACCESS_READWRITE);
-                case '{DAV:}no-access' :
+                case '{DAV:}no-access':
                     return new self(SharingPlugin::ACCESS_NOACCESS);
             }
         }
         throw new BadRequest('Invalid value for {DAV:}share-access element');
-
     }
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedLock.php b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedLock.php
index 677fdde4b..26e7d646e 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedLock.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedLock.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\Xml\Writer;
@@ -18,8 +20,8 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SupportedLock implements XmlSerializable {
-
+class SupportedLock implements XmlSerializable
+{
     /**
      * The xmlSerialize method is called during xml writing.
      *
@@ -37,18 +39,16 @@ class SupportedLock implements XmlSerializable {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         $writer->writeElement('{DAV:}lockentry', [
             '{DAV:}lockscope' => ['{DAV:}exclusive' => null],
-            '{DAV:}locktype'  => ['{DAV:}write' => null],
+            '{DAV:}locktype' => ['{DAV:}write' => null],
         ]);
         $writer->writeElement('{DAV:}lockentry', [
             '{DAV:}lockscope' => ['{DAV:}shared' => null],
-            '{DAV:}locktype'  => ['{DAV:}write' => 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
index 1a3878ef7..06ab28c94 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedMethodSet.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedMethodSet.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\DAV\Browser\HtmlOutput;
@@ -20,24 +22,23 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SupportedMethodSet implements XmlSerializable, HtmlOutput {
-
+class SupportedMethodSet implements XmlSerializable, HtmlOutput
+{
     /**
-     * List of methods
+     * List of methods.
      *
      * @var string[]
      */
     protected $methods = [];
 
     /**
-     * Creates the property
+     * Creates the property.
      *
      * @param string[] $methods
      */
-    function __construct(array $methods) {
-
+    public function __construct(array $methods)
+    {
         $this->methods = $methods;
-
     }
 
     /**
@@ -45,25 +46,24 @@ class SupportedMethodSet implements XmlSerializable, HtmlOutput {
      *
      * @return string[]
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->methods;
-
     }
 
     /**
      * Returns true or false if the property contains a specific method.
      *
      * @param string $methodName
+     *
      * @return bool
      */
-    function has($methodName) {
-
+    public function has($methodName)
+    {
         return in_array(
             $methodName,
             $this->methods
         );
-
     }
 
     /**
@@ -83,16 +83,14 @@ class SupportedMethodSet implements XmlSerializable, HtmlOutput {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->getValue() as $val) {
             $writer->startElement('{DAV:}supported-method');
             $writer->writeAttribute('name', $val);
             $writer->endElement();
         }
-
     }
 
     /**
@@ -107,15 +105,14 @@ class SupportedMethodSet implements XmlSerializable, HtmlOutput {
      * be used to construct local links.
      *
      * @param HtmlOutputHelper $html
+     *
      * @return string
      */
-    function toHtml(HtmlOutputHelper $html) {
-
+    public 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
index 96383ec96..4c25d23d9 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedReportSet.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Property/SupportedReportSet.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Property;
 
 use Sabre\DAV;
@@ -21,17 +23,17 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SupportedReportSet implements XmlSerializable, HtmlOutput {
-
+class SupportedReportSet implements XmlSerializable, HtmlOutput
+{
     /**
-     * List of reports
+     * List of reports.
      *
      * @var array
      */
     protected $reports = [];
 
     /**
-     * Creates the property
+     * Creates the property.
      *
      * Any reports passed in the constructor
      * should be valid report-types in clark-notation.
@@ -40,61 +42,56 @@ class SupportedReportSet implements XmlSerializable, HtmlOutput {
      *
      * @param string|string[] $reports
      */
-    function __construct($reports = null) {
-
-        if (!is_null($reports))
+    public function __construct($reports = null)
+    {
+        if (!is_null($reports)) {
             $this->addReport($reports);
-
+        }
     }
 
     /**
-     * Adds a report to this property
+     * 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;
+    public function addReport($report)
+    {
+        $report = (array) $report;
 
         foreach ($report as $r) {
-
-            if (!preg_match('/^{([^}]*)}(.*)$/', $r))
+            if (!preg_match('/^{([^}]*)}(.*)$/', $r)) {
                 throw new DAV\Exception('Reportname must be in clark-notation');
-
+            }
             $this->reports[] = $r;
-
         }
-
     }
 
     /**
-     * Returns the list of supported reports
+     * Returns the list of supported reports.
      *
      * @return string[]
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->reports;
-
     }
 
     /**
      * Returns true or false if the property contains a specific report.
      *
      * @param string $reportName
+     *
      * @return bool
      */
-    function has($reportName) {
-
+    public function has($reportName)
+    {
         return in_array(
             $reportName,
             $this->reports
         );
-
     }
 
     /**
@@ -114,10 +111,9 @@ class SupportedReportSet implements XmlSerializable, HtmlOutput {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->getValue() as $val) {
             $writer->startElement('{DAV:}supported-report');
             $writer->startElement('{DAV:}report');
@@ -125,7 +121,6 @@ class SupportedReportSet implements XmlSerializable, HtmlOutput {
             $writer->endElement();
             $writer->endElement();
         }
-
     }
 
     /**
@@ -140,15 +135,14 @@ class SupportedReportSet implements XmlSerializable, HtmlOutput {
      * be used to construct local links.
      *
      * @param HtmlOutputHelper $html
+     *
      * @return string
      */
-    function toHtml(HtmlOutputHelper $html) {
-
+    public 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
index c315a9a45..8d9348162 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Request/Lock.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/Lock.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Request;
 
 use Sabre\DAV\Locks\LockInfo;
@@ -18,10 +20,10 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Lock implements XmlDeserializable {
-
+class Lock implements XmlDeserializable
+{
     /**
-     * Owner of the lock
+     * Owner of the lock.
      *
      * @var string
      */
@@ -31,6 +33,7 @@ class Lock implements XmlDeserializable {
      * Scope of the lock.
      *
      * Either LockInfo::SHARED or LockInfo::EXCLUSIVE
+     *
      * @var int
      */
     public $scope;
@@ -54,10 +57,11 @@ class Lock implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $reader->pushContext();
         $reader->elementMap['{DAV:}owner'] = 'Sabre\\Xml\\Element\\XmlFragment';
 
@@ -71,11 +75,12 @@ class Lock implements XmlDeserializable {
 
         if (isset($values['{DAV:}lockscope'])) {
             foreach ($values['{DAV:}lockscope'] as $elem) {
-                if ($elem['name'] === '{DAV:}exclusive') $new->scope = LockInfo::EXCLUSIVE;
+                if ('{DAV:}exclusive' === $elem['name']) {
+                    $new->scope = LockInfo::EXCLUSIVE;
+                }
             }
         }
-        return $new;
 
+        return $new;
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Request/MkCol.php b/vendor/sabre/dav/lib/DAV/Xml/Request/MkCol.php
index 9490bf58c..7713646ea 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Request/MkCol.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/MkCol.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Request;
 
 use Sabre\Xml\Reader;
@@ -16,8 +18,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class MkCol implements XmlDeserializable {
-
+class MkCol implements XmlDeserializable
+{
     /**
      * The list of properties that will be set.
      *
@@ -31,10 +33,9 @@ class MkCol implements XmlDeserializable {
      *
      * @return array
      */
-    function getProperties() {
-
+    public function getProperties()
+    {
         return $this->properties;
-
     }
 
     /**
@@ -56,10 +57,11 @@ class MkCol implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $self = new self();
 
         $elementMap = $reader->elementMap;
@@ -70,13 +72,11 @@ class MkCol implements XmlDeserializable {
         $elems = $reader->parseInnerTree($elementMap);
 
         foreach ($elems as $elem) {
-            if ($elem['name'] === '{DAV:}set') {
+            if ('{DAV:}set' === $elem['name']) {
                 $self->properties = array_merge($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
index f1b5b6fdc..b4cce423e 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Request/PropFind.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/PropFind.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Request;
 
 use Sabre\Xml\Element\KeyValue;
@@ -17,8 +19,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PropFind implements XmlDeserializable {
-
+class PropFind implements XmlDeserializable
+{
     /**
      * If this is set to true, this was an 'allprop' request.
      *
@@ -27,9 +29,9 @@ class PropFind implements XmlDeserializable {
     public $allProp = false;
 
     /**
-     * The property list
+     * The property list.
      *
-     * @var null|array
+     * @var array|null
      */
     public $properties;
 
@@ -52,32 +54,28 @@ class PropFind implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public 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' :
+                case '{DAV:}prop':
                     $self->properties = $v;
                     break;
-                case '{DAV:}allprop' :
+                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
index 821b9e047..55e154ec7 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Request/PropPatch.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/PropPatch.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Request;
 
 use Sabre\Xml\Element;
@@ -17,8 +19,8 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PropPatch implements Element {
-
+class PropPatch implements Element
+{
     /**
      * The list of properties that will be updated and removed.
      *
@@ -45,24 +47,20 @@ class PropPatch implements Element {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->properties as $propertyName => $propertyValue) {
-
             if (is_null($propertyValue)) {
-                $writer->startElement("{DAV:}remove");
+                $writer->startElement('{DAV:}remove');
                 $writer->write(['{DAV:}prop' => [$propertyName => $propertyValue]]);
                 $writer->endElement();
             } else {
-                $writer->startElement("{DAV:}set");
+                $writer->startElement('{DAV:}set');
                 $writer->write(['{DAV:}prop' => [$propertyName => $propertyValue]]);
                 $writer->endElement();
             }
-
         }
-
     }
 
     /**
@@ -84,10 +82,11 @@ class PropPatch implements Element {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $self = new self();
 
         $elementMap = $reader->elementMap;
@@ -98,21 +97,17 @@ class PropPatch implements Element {
         $elems = $reader->parseInnerTree($elementMap);
 
         foreach ($elems as $elem) {
-            if ($elem['name'] === '{DAV:}set') {
+            if ('{DAV:}set' === $elem['name']) {
                 $self->properties = array_merge($self->properties, $elem['value']['{DAV:}prop']);
             }
-            if ($elem['name'] === '{DAV:}remove') {
-
+            if ('{DAV:}remove' === $elem['name']) {
                 // Ensuring there are no values.
                 foreach ($elem['value']['{DAV:}prop'] as $remove => $value) {
                     $self->properties[$remove] = null;
                 }
-
             }
         }
 
         return $self;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Request/ShareResource.php b/vendor/sabre/dav/lib/DAV/Xml/Request/ShareResource.php
index 526a4eb6f..e1985b8c3 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Request/ShareResource.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/ShareResource.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Request;
 
 use Sabre\DAV\Xml\Element\Sharee;
@@ -17,8 +19,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ShareResource implements XmlDeserializable {
-
+class ShareResource implements XmlDeserializable
+{
     /**
      * The list of new people added or updated or removed from the share.
      *
@@ -27,14 +29,13 @@ class ShareResource implements XmlDeserializable {
     public $sharees = [];
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param Sharee[] $sharees
      */
-    function __construct(array $sharees) {
-
+    public function __construct(array $sharees)
+    {
         $this->sharees = $sharees;
-
     }
 
     /**
@@ -56,26 +57,26 @@ class ShareResource implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $elems = $reader->parseInnerTree([
-            '{DAV:}sharee'       => 'Sabre\DAV\Xml\Element\Sharee',
+            '{DAV:}sharee' => 'Sabre\DAV\Xml\Element\Sharee',
             '{DAV:}share-access' => 'Sabre\DAV\Xml\Property\ShareAccess',
-            '{DAV:}prop'         => 'Sabre\Xml\Deserializer\keyValue',
+            '{DAV:}prop' => 'Sabre\Xml\Deserializer\keyValue',
         ]);
 
         $sharees = [];
 
         foreach ($elems as $elem) {
-            if ($elem['name'] !== '{DAV:}sharee') continue;
+            if ('{DAV:}sharee' !== $elem['name']) {
+                continue;
+            }
             $sharees[] = $elem['value'];
-
         }
 
         return new self($sharees);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAV/Xml/Request/SyncCollectionReport.php b/vendor/sabre/dav/lib/DAV/Xml/Request/SyncCollectionReport.php
index 830293a01..acf0039ce 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Request/SyncCollectionReport.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Request/SyncCollectionReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Request;
 
 use Sabre\DAV\Exception\BadRequest;
@@ -18,8 +20,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://www.rooftopsolutions.nl/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SyncCollectionReport implements XmlDeserializable {
-
+class SyncCollectionReport implements XmlDeserializable
+{
     /**
      * The sync-token the client supplied for the report.
      *
@@ -44,7 +46,7 @@ class SyncCollectionReport implements XmlDeserializable {
     /**
      * The list of properties that are being requested for every change.
      *
-     * @var null|array
+     * @var array|null
      */
     public $properties;
 
@@ -67,10 +69,11 @@ class SyncCollectionReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $self = new self();
 
         $reader->pushContext();
@@ -87,36 +90,31 @@ class SyncCollectionReport implements XmlDeserializable {
 
         foreach ($required as $elem) {
             if (!array_key_exists($elem, $elems)) {
-                throw new BadRequest('The ' . $elem . ' element in the {DAV:}sync-collection report is required');
+                throw new BadRequest('The '.$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'];
+                if ('{DAV:}nresults' === $child['name']) {
+                    $nresults = (int) $child['value'];
                 }
             }
             $self->limit = $nresults;
         }
 
         if (isset($elems['{DAV:}sync-level'])) {
-
             $value = $elems['{DAV:}sync-level'];
-            if ($value === 'infinity') {
+            if ('infinity' === $value) {
                 $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
index cf5a0453b..423d0b569 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Response/MultiStatus.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Response/MultiStatus.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml\Response;
 
 use Sabre\Xml\Element;
@@ -7,7 +9,7 @@ use Sabre\Xml\Reader;
 use Sabre\Xml\Writer;
 
 /**
- * WebDAV MultiStatus parser
+ * WebDAV MultiStatus parser.
  *
  * This class parses the {DAV:}multistatus response, as defined in:
  * https://tools.ietf.org/html/rfc4918#section-14.16
@@ -19,10 +21,10 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class MultiStatus implements Element {
-
+class MultiStatus implements Element
+{
     /**
-     * The responses
+     * The responses.
      *
      * @var \Sabre\DAV\Xml\Element\Response[]
      */
@@ -36,16 +38,15 @@ class MultiStatus implements Element {
     protected $syncToken;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param \Sabre\DAV\Xml\Element\Response[] $responses
-     * @param string $syncToken
+     * @param string                            $syncToken
      */
-    function __construct(array $responses, $syncToken = null) {
-
+    public function __construct(array $responses, $syncToken = null)
+    {
         $this->responses = $responses;
         $this->syncToken = $syncToken;
-
     }
 
     /**
@@ -53,10 +54,9 @@ class MultiStatus implements Element {
      *
      * @return \Sabre\DAV\Xml\Element\Response[]
      */
-    function getResponses() {
-
+    public function getResponses()
+    {
         return $this->responses;
-
     }
 
     /**
@@ -64,10 +64,9 @@ class MultiStatus implements Element {
      *
      * @return string|null
      */
-    function getSyncToken() {
-
+    public function getSyncToken()
+    {
         return $this->syncToken;
-
     }
 
     /**
@@ -83,17 +82,15 @@ class MultiStatus implements Element {
      * responsible for closing them.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->getResponses() as $response) {
             $writer->writeElement('{DAV:}response', $response);
         }
         if ($syncToken = $this->getSyncToken()) {
             $writer->writeElement('{DAV:}sync-token', $syncToken);
         }
-
     }
 
     /**
@@ -115,10 +112,11 @@ class MultiStatus implements Element {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $elementMap = $reader->elementMap;
         $elementMap['{DAV:}prop'] = 'Sabre\\DAV\\Xml\\Element\\Prop';
         $elements = $reader->parseInnerTree($elementMap);
@@ -126,17 +124,17 @@ class MultiStatus implements Element {
         $responses = [];
         $syncToken = null;
 
-        if ($elements) foreach ($elements as $elem) {
-            if ($elem['name'] === '{DAV:}response') {
-                $responses[] = $elem['value'];
-            }
-            if ($elem['name'] === '{DAV:}sync-token') {
-                $syncToken = $elem['value'];
+        if ($elements) {
+            foreach ($elements as $elem) {
+                if ('{DAV:}response' === $elem['name']) {
+                    $responses[] = $elem['value'];
+                }
+                if ('{DAV:}sync-token' === $elem['name']) {
+                    $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
index f41ed984a..4406b022d 100644
--- a/vendor/sabre/dav/lib/DAV/Xml/Service.php
+++ b/vendor/sabre/dav/lib/DAV/Xml/Service.php
@@ -1,16 +1,18 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAV\Xml;
 
 /**
- * XML service for WebDAV
+ * 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 {
-
+class Service extends \Sabre\Xml\Service
+{
     /**
      * This is a list of XML elements that we automatically map to PHP classes.
      *
@@ -19,16 +21,15 @@ class Service extends \Sabre\Xml\Service {
      */
     public $elementMap = [
         '{DAV:}multistatus' => 'Sabre\\DAV\\Xml\\Response\\MultiStatus',
-        '{DAV:}response'    => 'Sabre\\DAV\\Xml\\Element\\Response',
+        '{DAV:}response' => 'Sabre\\DAV\\Xml\\Element\\Response',
 
         // Requests
-        '{DAV:}propfind'       => 'Sabre\\DAV\\Xml\\Request\\PropFind',
+        '{DAV:}propfind' => 'Sabre\\DAV\\Xml\\Request\\PropFind',
         '{DAV:}propertyupdate' => 'Sabre\\DAV\\Xml\\Request\\PropPatch',
-        '{DAV:}mkcol'          => 'Sabre\\DAV\\Xml\\Request\\MkCol',
+        '{DAV:}mkcol' => 'Sabre\\DAV\\Xml\\Request\\MkCol',
 
         // Properties
         '{DAV:}resourcetype' => 'Sabre\\DAV\\Xml\\Property\\ResourceType',
-
     ];
 
     /**
@@ -40,8 +41,7 @@ class Service extends \Sabre\Xml\Service {
      * @var array
      */
     public $namespaceMap = [
-        'DAV:'                   => 'd',
+        'DAV:' => 'd',
         'http://sabredav.org/ns' => 's',
     ];
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/ACLTrait.php b/vendor/sabre/dav/lib/DAVACL/ACLTrait.php
index 602654a2e..d9bf4e1e0 100644
--- a/vendor/sabre/dav/lib/DAVACL/ACLTrait.php
+++ b/vendor/sabre/dav/lib/DAVACL/ACLTrait.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL;
 
 /**
@@ -14,32 +16,30 @@ namespace Sabre\DAVACL;
  * @author Evert Pot (https://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-trait ACLTrait {
-
+trait ACLTrait
+{
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return null;
-
     }
 
     /**
-     * Returns a group principal
+     * Returns a group principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getGroup() {
-
+    public function getGroup()
+    {
         return null;
-
     }
 
     /**
@@ -54,28 +54,26 @@ trait ACLTrait {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         return [
             [
                 'privilege' => '{DAV:}all',
                 'principal' => '{DAV:}owner',
                 'protected' => true,
-            ]
+            ],
         ];
-
     }
 
     /**
-     * Updates the 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) {
-
+    public function setACL(array $acl)
+    {
         throw new \Sabre\DAV\Exception\Forbidden('Setting ACL is not supported on this node');
     }
 
@@ -91,10 +89,8 @@ trait ACLTrait {
      *
      * @return array|null
      */
-    function getSupportedPrivilegeSet() {
-
+    public function getSupportedPrivilegeSet()
+    {
         return null;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/AbstractPrincipalCollection.php b/vendor/sabre/dav/lib/DAVACL/AbstractPrincipalCollection.php
index 9d2026380..1160dd7ac 100644
--- a/vendor/sabre/dav/lib/DAVACL/AbstractPrincipalCollection.php
+++ b/vendor/sabre/dav/lib/DAVACL/AbstractPrincipalCollection.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL;
 
 use Sabre\DAV;
-use Sabre\HTTP\URLUtil;
+use Sabre\Uri;
 
 /**
- * Principals Collection
+ * Principals Collection.
  *
  * This is a helper class that easily allows you to create a collection that
  * has a childnode for every principal.
@@ -17,10 +19,10 @@ use Sabre\HTTP\URLUtil;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class AbstractPrincipalCollection extends DAV\Collection implements IPrincipalCollection {
-
+abstract class AbstractPrincipalCollection extends DAV\Collection implements IPrincipalCollection
+{
     /**
-     * Principal backend
+     * Principal backend.
      *
      * @var PrincipalBackend\BackendInterface
      */
@@ -42,7 +44,7 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
     public $disableListing = false;
 
     /**
-     * Creates the object
+     * Creates the object.
      *
      * This object must be passed the principal backend. This object will
      * filter all principals from a specified prefix ($principalPrefix). The
@@ -51,13 +53,12 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
      *
      *
      * @param PrincipalBackend\BackendInterface $principalBackend
-     * @param string $principalPrefix
+     * @param string                            $principalPrefix
      */
-    function __construct(PrincipalBackend\BackendInterface $principalBackend, $principalPrefix = 'principals') {
-
+    public function __construct(PrincipalBackend\BackendInterface $principalBackend, $principalPrefix = 'principals')
+    {
         $this->principalPrefix = $principalPrefix;
         $this->principalBackend = $principalBackend;
-
     }
 
     /**
@@ -68,56 +69,58 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
      * supplied by the authentication backend.
      *
      * @param array $principalInfo
-     * @return IPrincipal
+     *
+     * @return DAV\INode
      */
-    abstract function getChildForPrincipal(array $principalInfo);
+    abstract public function getChildForPrincipal(array $principalInfo);
 
     /**
      * Returns the name of this collection.
      *
      * @return string
      */
-    function getName() {
+    public function getName()
+    {
+        list(, $name) = Uri\split($this->principalPrefix);
 
-        list(, $name) = URLUtil::splitPath($this->principalPrefix);
         return $name;
-
     }
 
     /**
-     * Return the list of users
+     * Return the list of users.
      *
      * @return array
      */
-    function getChildren() {
-
-        if ($this->disableListing)
+    public function getChildren()
+    {
+        if ($this->disableListing) {
             throw new DAV\Exception\MethodNotAllowed('Listing members of this collection is disabled');
-
+        }
         $children = [];
         foreach ($this->principalBackend->getPrincipalsByPrefix($this->principalPrefix) as $principalInfo) {
-
             $children[] = $this->getChildForPrincipal($principalInfo);
-
-
         }
-        return $children;
 
+        return $children;
     }
 
     /**
      * Returns a child object, by its name.
      *
      * @param string $name
+     *
      * @throws DAV\Exception\NotFound
+     *
      * @return DAV\INode
      */
-    function getChild($name) {
+    public function getChild($name)
+    {
+        $principalInfo = $this->principalBackend->getPrincipalByPath($this->principalPrefix.'/'.$name);
+        if (!$principalInfo) {
+            throw new DAV\Exception\NotFound('Principal with name '.$name.' not found');
+        }
 
-        $principalInfo = $this->principalBackend->getPrincipalByPath($this->principalPrefix . '/' . $name);
-        if (!$principalInfo) throw new DAV\Exception\NotFound('Principal with name ' . $name . ' not found');
         return $this->getChildForPrincipal($principalInfo);
-
     }
 
     /**
@@ -139,21 +142,21 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
      * 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 array  $searchProperties
      * @param string $test
+     *
      * @return array
      */
-    function searchPrincipals(array $searchProperties, $test = 'allof') {
-
+    public function searchPrincipals(array $searchProperties, $test = 'allof')
+    {
         $result = $this->principalBackend->searchPrincipals($this->principalPrefix, $searchProperties, $test);
         $r = [];
 
         foreach ($result as $row) {
-            list(, $r[]) = URLUtil::splitPath($row);
+            list(, $r[]) = Uri\split($row);
         }
 
         return $r;
-
     }
 
     /**
@@ -170,12 +173,11 @@ abstract class AbstractPrincipalCollection extends DAV\Collection implements IPr
      * principal was not found or you refuse to find it.
      *
      * @param string $uri
+     *
      * @return string
      */
-    function findByUri($uri) {
-
+    public function findByUri($uri)
+    {
         return $this->principalBackend->findByUri($uri, $this->principalPrefix);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Exception/AceConflict.php b/vendor/sabre/dav/lib/DAVACL/Exception/AceConflict.php
index 22450b4a6..7756d4728 100644
--- a/vendor/sabre/dav/lib/DAVACL/Exception/AceConflict.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/AceConflict.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Exception;
 
 use Sabre\DAV;
@@ -12,24 +14,21 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class AceConflict extends DAV\Exception\Conflict {
-
+class AceConflict extends DAV\Exception\Conflict
+{
     /**
      * Adds in extra information in the xml response.
      *
      * This method adds the {DAV:}no-ace-conflict element as defined in rfc3744
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         $doc = $errorNode->ownerDocument;
 
         $np = $doc->createElementNS('DAV:', 'd:no-ace-conflict');
         $errorNode->appendChild($np);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Exception/NeedPrivileges.php b/vendor/sabre/dav/lib/DAVACL/Exception/NeedPrivileges.php
index 5624fd22f..19e0dac9d 100644
--- a/vendor/sabre/dav/lib/DAVACL/Exception/NeedPrivileges.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/NeedPrivileges.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Exception;
 
 use Sabre\DAV;
 
 /**
- * NeedPrivileges
+ * NeedPrivileges.
  *
  * The 403-need privileges is thrown when a user didn't have the appropriate
  * permissions to perform an operation
@@ -14,10 +16,10 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class NeedPrivileges extends DAV\Exception\Forbidden {
-
+class NeedPrivileges extends DAV\Exception\Forbidden
+{
     /**
-     * The relevant uri
+     * The relevant uri.
      *
      * @var string
      */
@@ -31,18 +33,17 @@ class NeedPrivileges extends DAV\Exception\Forbidden {
     protected $privileges;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param string $uri
-     * @param array $privileges
+     * @param array  $privileges
      */
-    function __construct($uri, array $privileges) {
-
+    public function __construct($uri, array $privileges)
+    {
         $this->uri = $uri;
         $this->privileges = $privileges;
 
-        parent::__construct('User did not have the required privileges (' . implode(',', $privileges) . ') for path "' . $uri . '"');
-
+        parent::__construct('User did not have the required privileges ('.implode(',', $privileges).') for path "'.$uri.'"');
     }
 
     /**
@@ -50,33 +51,27 @@ class NeedPrivileges extends DAV\Exception\Forbidden {
      *
      * This method adds the {DAV:}need-privileges element as defined in rfc3744
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         $doc = $errorNode->ownerDocument;
 
         $np = $doc->createElementNS('DAV:', 'd:need-privileges');
         $errorNode->appendChild($np);
 
         foreach ($this->privileges as $privilege) {
-
             $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');
             $resource->appendChild($priv);
 
             preg_match('/^{([^}]*)}(.*)$/', $privilege, $privilegeParts);
-            $priv->appendChild($doc->createElementNS($privilegeParts[1], 'd:' . $privilegeParts[2]));
-
-
+            $priv->appendChild($doc->createElementNS($privilegeParts[1], 'd:'.$privilegeParts[2]));
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Exception/NoAbstract.php b/vendor/sabre/dav/lib/DAVACL/Exception/NoAbstract.php
index a2363b174..d90b01ffd 100644
--- a/vendor/sabre/dav/lib/DAVACL/Exception/NoAbstract.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/NoAbstract.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Exception;
 
 use Sabre\DAV;
@@ -12,24 +14,21 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class NoAbstract extends DAV\Exception\PreconditionFailed {
-
+class NoAbstract extends DAV\Exception\PreconditionFailed
+{
     /**
      * Adds in extra information in the xml response.
      *
      * This method adds the {DAV:}no-abstract element as defined in rfc3744
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         $doc = $errorNode->ownerDocument;
 
         $np = $doc->createElementNS('DAV:', 'd:no-abstract');
         $errorNode->appendChild($np);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Exception/NotRecognizedPrincipal.php b/vendor/sabre/dav/lib/DAVACL/Exception/NotRecognizedPrincipal.php
index d7ae188ae..b005c55d8 100644
--- a/vendor/sabre/dav/lib/DAVACL/Exception/NotRecognizedPrincipal.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/NotRecognizedPrincipal.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Exception;
 
 use Sabre\DAV;
@@ -12,24 +14,21 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class NotRecognizedPrincipal extends DAV\Exception\PreconditionFailed {
-
+class NotRecognizedPrincipal extends DAV\Exception\PreconditionFailed
+{
     /**
      * Adds in extra information in the xml response.
      *
      * This method adds the {DAV:}recognized-principal element as defined in rfc3744
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         $doc = $errorNode->ownerDocument;
 
         $np = $doc->createElementNS('DAV:', 'd:recognized-principal');
         $errorNode->appendChild($np);
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Exception/NotSupportedPrivilege.php b/vendor/sabre/dav/lib/DAVACL/Exception/NotSupportedPrivilege.php
index 73b81190d..dda2e6281 100644
--- a/vendor/sabre/dav/lib/DAVACL/Exception/NotSupportedPrivilege.php
+++ b/vendor/sabre/dav/lib/DAVACL/Exception/NotSupportedPrivilege.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Exception;
 
 use Sabre\DAV;
@@ -12,24 +14,21 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class NotSupportedPrivilege extends DAV\Exception\PreconditionFailed {
-
+class NotSupportedPrivilege extends DAV\Exception\PreconditionFailed
+{
     /**
      * Adds in extra information in the xml response.
      *
      * This method adds the {DAV:}not-supported-privilege element as defined in rfc3744
      *
-     * @param DAV\Server $server
+     * @param DAV\Server  $server
      * @param \DOMElement $errorNode
-     * @return void
      */
-    function serialize(DAV\Server $server, \DOMElement $errorNode) {
-
+    public function serialize(DAV\Server $server, \DOMElement $errorNode)
+    {
         $doc = $errorNode->ownerDocument;
 
         $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
index b4fe7a1b0..85b04e2bd 100644
--- a/vendor/sabre/dav/lib/DAVACL/FS/Collection.php
+++ b/vendor/sabre/dav/lib/DAVACL/FS/Collection.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\FS;
 
 use Sabre\DAV\Exception\Forbidden;
@@ -15,8 +17,8 @@ use Sabre\DAVACL\IACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Collection extends BaseCollection implements IACL {
-
+class Collection extends BaseCollection implements IACL
+{
     use ACLTrait;
 
     /**
@@ -34,60 +36,58 @@ class Collection extends BaseCollection implements IACL {
     protected $owner;
 
     /**
-     * Constructor
+     * Constructor.
      *
-     * @param string $path on-disk path.
-     * @param array $acl ACL rules.
-     * @param string|null $owner principal owner string.
+     * @param string      $path  on-disk path
+     * @param array       $acl   ACL rules
+     * @param string|null $owner principal owner string
      */
-    function __construct($path, array $acl, $owner = null) {
-
+    public function __construct($path, array $acl, $owner = null)
+    {
         parent::__construct($path);
         $this->acl = $acl;
         $this->owner = $owner;
-
     }
 
     /**
-     * Returns a specific child node, referenced by its name
+     * 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 $name
+     *
      * @throws NotFound
+     *
      * @return \Sabre\DAV\INode
      */
-    function getChild($name) {
-
-        $path = $this->path . '/' . $name;
-
-        if (!file_exists($path)) throw new NotFound('File could not be located');
-        if ($name == '.' || $name == '..') throw new Forbidden('Permission denied to . and ..');
+    public function getChild($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
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->owner;
-
     }
 
     /**
@@ -102,10 +102,8 @@ class Collection extends BaseCollection implements IACL {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         return $this->acl;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/FS/File.php b/vendor/sabre/dav/lib/DAVACL/FS/File.php
index aaf2ae148..5506aa2c1 100644
--- a/vendor/sabre/dav/lib/DAVACL/FS/File.php
+++ b/vendor/sabre/dav/lib/DAVACL/FS/File.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\FS;
 
 use Sabre\DAV\FSExt\File as BaseFile;
@@ -13,8 +15,8 @@ use Sabre\DAVACL\IACL;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class File extends BaseFile implements IACL {
-
+class File extends BaseFile implements IACL
+{
     use ACLTrait;
 
     /**
@@ -32,31 +34,29 @@ class File extends BaseFile implements IACL {
     protected $owner;
 
     /**
-     * Constructor
+     * Constructor.
      *
-     * @param string $path on-disk path.
-     * @param array $acl ACL rules.
-     * @param string|null $owner principal owner string.
+     * @param string      $path  on-disk path
+     * @param array       $acl   ACL rules
+     * @param string|null $owner principal owner string
      */
-    function __construct($path, array $acl, $owner = null) {
-
+    public function __construct($path, array $acl, $owner = null)
+    {
         parent::__construct($path);
         $this->acl = $acl;
         $this->owner = $owner;
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->owner;
-
     }
 
     /**
@@ -71,10 +71,8 @@ class File extends BaseFile implements IACL {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         return $this->acl;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/FS/HomeCollection.php b/vendor/sabre/dav/lib/DAVACL/FS/HomeCollection.php
index 201235e5a..c896d8e25 100644
--- a/vendor/sabre/dav/lib/DAVACL/FS/HomeCollection.php
+++ b/vendor/sabre/dav/lib/DAVACL/FS/HomeCollection.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\FS;
 
 use Sabre\DAVACL\AbstractPrincipalCollection;
@@ -19,8 +21,8 @@ use Sabre\Uri;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class HomeCollection extends AbstractPrincipalCollection implements IACL {
-
+class HomeCollection extends AbstractPrincipalCollection implements IACL
+{
     use ACLTrait;
 
     /**
@@ -41,14 +43,13 @@ class HomeCollection extends AbstractPrincipalCollection implements IACL {
      * Creates the home collection.
      *
      * @param BackendInterface $principalBackend
-     * @param string $storagePath Where the actual files are stored.
-     * @param string $principalPrefix list of principals to iterate.
+     * @param string           $storagePath      where the actual files are stored
+     * @param string           $principalPrefix  list of principals to iterate
      */
-    function __construct(BackendInterface $principalBackend, $storagePath, $principalPrefix = 'principals') {
-
+    public function __construct(BackendInterface $principalBackend, $storagePath, $principalPrefix = 'principals')
+    {
         parent::__construct($principalBackend, $principalPrefix);
         $this->storagePath = $storagePath;
-
     }
 
     /**
@@ -58,10 +59,9 @@ class HomeCollection extends AbstractPrincipalCollection implements IACL {
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         return $this->collectionName;
-
     }
 
     /**
@@ -72,10 +72,11 @@ class HomeCollection extends AbstractPrincipalCollection implements IACL {
      * supplied by the authentication backend.
      *
      * @param array $principalInfo
+     *
      * @return \Sabre\DAV\INode
      */
-    function getChildForPrincipal(array $principalInfo) {
-
+    public function getChildForPrincipal(array $principalInfo)
+    {
         $owner = $principalInfo['uri'];
         $acl = [
             [
@@ -87,20 +88,19 @@ class HomeCollection extends AbstractPrincipalCollection implements IACL {
 
         list(, $principalBaseName) = Uri\split($owner);
 
-        $path = $this->storagePath . '/' . $principalBaseName;
+        $path = $this->storagePath.'/'.$principalBaseName;
 
         if (!is_dir($path)) {
             mkdir($path, 0777, true);
         }
+
         return new Collection(
             $path,
             $acl,
             $owner
         );
-
     }
 
-
     /**
      * Returns a list of ACE's for this node.
      *
@@ -113,16 +113,14 @@ class HomeCollection extends AbstractPrincipalCollection implements IACL {
      *
      * @return array
      */
-    function getACL() {
-
+    public function getACL()
+    {
         return [
             [
                 'principal' => '{DAV:}authenticated',
                 'privilege' => '{DAV:}read',
                 'protected' => true,
-            ]
+            ],
         ];
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/IACL.php b/vendor/sabre/dav/lib/DAVACL/IACL.php
index f7a138665..d19a075be 100644
--- a/vendor/sabre/dav/lib/DAVACL/IACL.php
+++ b/vendor/sabre/dav/lib/DAVACL/IACL.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL;
 
 use Sabre\DAV;
 
 /**
- * ACL-enabled node
+ * ACL-enabled node.
  *
  * If you want to add WebDAV ACL to a node, you must implement this class
  *
@@ -13,25 +15,25 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IACL extends DAV\INode {
-
+interface IACL extends DAV\INode
+{
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner();
+    public function getOwner();
 
     /**
-     * Returns a group principal
+     * Returns a group principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getGroup();
+    public function getGroup();
 
     /**
      * Returns a list of ACE's for this node.
@@ -45,17 +47,16 @@ interface IACL extends DAV\INode {
      *
      * @return array
      */
-    function getACL();
+    public function getACL();
 
     /**
-     * Updates the 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);
+    public function setACL(array $acl);
 
     /**
      * Returns the list of supported privileges for this node.
@@ -69,6 +70,5 @@ interface IACL extends DAV\INode {
      *
      * @return array|null
      */
-    function getSupportedPrivilegeSet();
-
+    public function getSupportedPrivilegeSet();
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/IPrincipal.php b/vendor/sabre/dav/lib/DAVACL/IPrincipal.php
index 13728471e..c804096de 100644
--- a/vendor/sabre/dav/lib/DAVACL/IPrincipal.php
+++ b/vendor/sabre/dav/lib/DAVACL/IPrincipal.php
@@ -1,11 +1,13 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL;
 
 use Sabre\DAV;
 
 /**
- * IPrincipal interface
+ * IPrincipal interface.
  *
  * Implement this interface to define your own principals
  *
@@ -13,46 +15,46 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IPrincipal extends DAV\INode {
-
+interface IPrincipal extends DAV\INode
+{
     /**
-     * Returns a list of alternative urls for a principal
+     * Returns a list of alternative urls for a principal.
      *
      * This can for example be an email address, or ldap url.
      *
      * @return array
      */
-    function getAlternateUriSet();
+    public function getAlternateUriSet();
 
     /**
-     * Returns the full principal url
+     * Returns the full principal url.
      *
      * @return string
      */
-    function getPrincipalUrl();
+    public function getPrincipalUrl();
 
     /**
-     * Returns the list of group members
+     * Returns the list of group members.
      *
      * If this principal is a group, this function should return
      * all member principal uri's for the group.
      *
      * @return array
      */
-    function getGroupMemberSet();
+    public function getGroupMemberSet();
 
     /**
-     * Returns the list of groups this principal is member of
+     * Returns the list of groups this principal is member of.
      *
      * If this principal is a member of a (list of) groups, this function
      * should return a list of principal uri's for it's members.
      *
      * @return array
      */
-    function getGroupMembership();
+    public function getGroupMembership();
 
     /**
-     * Sets a list of group members
+     * Sets a list of group members.
      *
      * If this principal is a group, this method sets all the group members.
      * The list of members is always overwritten, never appended to.
@@ -60,18 +62,16 @@ interface IPrincipal extends DAV\INode {
      * This method should throw an exception if the members could not be set.
      *
      * @param array $principals
-     * @return void
      */
-    function setGroupMemberSet(array $principals);
+    public function setGroupMemberSet(array $principals);
 
     /**
-     * Returns the displayname
+     * Returns the displayname.
      *
      * This should be a human readable name for the principal.
      * If none is available, return the nodename.
      *
      * @return string
      */
-    function getDisplayName();
-
+    public function getDisplayName();
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/IPrincipalCollection.php b/vendor/sabre/dav/lib/DAVACL/IPrincipalCollection.php
index 3ab8382fa..1003730d6 100644
--- a/vendor/sabre/dav/lib/DAVACL/IPrincipalCollection.php
+++ b/vendor/sabre/dav/lib/DAVACL/IPrincipalCollection.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL;
 
 use Sabre\DAV;
@@ -14,8 +16,8 @@ use Sabre\DAV;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface IPrincipalCollection extends DAV\ICollection {
-
+interface IPrincipalCollection extends DAV\ICollection
+{
     /**
      * This method is used to search for principals matching a set of
      * properties.
@@ -35,11 +37,12 @@ interface IPrincipalCollection extends DAV\ICollection {
      * 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 array  $searchProperties
      * @param string $test
+     *
      * @return array
      */
-    function searchPrincipals(array $searchProperties, $test = 'allof');
+    public function searchPrincipals(array $searchProperties, $test = 'allof');
 
     /**
      * Finds a principal by its URI.
@@ -55,8 +58,8 @@ interface IPrincipalCollection extends DAV\ICollection {
      * principal was not found or you refuse to find it.
      *
      * @param string $uri
+     *
      * @return string
      */
-    function findByUri($uri);
-
+    public function findByUri($uri);
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Plugin.php b/vendor/sabre/dav/lib/DAVACL/Plugin.php
index a2aa118d7..c1ea6027c 100644
--- a/vendor/sabre/dav/lib/DAVACL/Plugin.php
+++ b/vendor/sabre/dav/lib/DAVACL/Plugin.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL;
 
 use Sabre\DAV;
@@ -15,7 +17,7 @@ use Sabre\HTTP\ResponseInterface;
 use Sabre\Uri;
 
 /**
- * SabreDAV ACL Plugin
+ * SabreDAV ACL Plugin.
  *
  * This plugin provides functionality to enforce ACL permissions.
  * ACL is defined in RFC3744.
@@ -28,24 +30,24 @@ use Sabre\Uri;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Plugin extends DAV\ServerPlugin {
-
+class Plugin extends DAV\ServerPlugin
+{
     /**
-     * Recursion constants
+     * Recursion constants.
      *
      * This only checks the base node
      */
     const R_PARENT = 1;
 
     /**
-     * Recursion constants
+     * Recursion constants.
      *
      * This checks every node in the tree
      */
     const R_RECURSIVE = 2;
 
     /**
-     * Recursion constants
+     * Recursion constants.
      *
      * This checks every parentnode in the tree, but not leaf-nodes.
      */
@@ -70,7 +72,7 @@ class Plugin extends DAV\ServerPlugin {
 
     /**
      * By default nodes that are inaccessible by the user, can still be seen
-     * in directory listings (PROPFIND on parent with Depth: 1)
+     * in directory listings (PROPFIND on parent with Depth: 1).
      *
      * In certain cases it's desirable to hide inaccessible nodes. Setting this
      * to true will cause these nodes to be hidden from directory listings.
@@ -88,7 +90,7 @@ class Plugin extends DAV\ServerPlugin {
      * @var array
      */
     public $principalSearchPropertySet = [
-        '{DAV:}displayname'                     => 'Display name',
+        '{DAV:}displayname' => 'Display name',
         '{http://sabredav.org/ns}email-address' => 'Email address',
     ];
 
@@ -120,22 +122,21 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getFeatures() {
-
+    public function getFeatures()
+    {
         return ['access-control', 'calendarserver-principal-property-search'];
-
     }
 
     /**
-     * Returns a list of available methods for a given url
+     * Returns a list of available methods for a given url.
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getMethods($uri) {
-
+    public function getMethods($uri)
+    {
         return ['ACL'];
-
     }
 
     /**
@@ -146,10 +147,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string
      */
-    function getPluginName() {
-
+    public function getPluginName()
+    {
         return 'acl';
-
     }
 
     /**
@@ -160,20 +160,19 @@ class Plugin extends DAV\ServerPlugin {
      * implement them
      *
      * @param string $uri
+     *
      * @return array
      */
-    function getSupportedReportSet($uri) {
-
+    public function getSupportedReportSet($uri)
+    {
         return [
             '{DAV:}expand-property',
             '{DAV:}principal-match',
             '{DAV:}principal-property-search',
             '{DAV:}principal-search-property-set',
         ];
-
     }
 
-
     /**
      * Checks if the current user has the specified privilege(s).
      *
@@ -181,27 +180,29 @@ class Plugin extends DAV\ServerPlugin {
      * This method will throw an exception if the privilege is not available
      * and return true otherwise.
      *
-     * @param string $uri
+     * @param string       $uri
      * @param array|string $privileges
-     * @param int $recursion
-     * @param bool $throwExceptions if set to false, this method won't throw exceptions.
+     * @param int          $recursion
+     * @param bool         $throwExceptions if set to false, this method won't throw exceptions
+     *
      * @throws NeedPrivileges
      * @throws NotAuthenticated
+     *
      * @return bool
      */
-    function checkPrivileges($uri, $privileges, $recursion = self::R_PARENT, $throwExceptions = true) {
-
-        if (!is_array($privileges)) $privileges = [$privileges];
+    public function checkPrivileges($uri, $privileges, $recursion = self::R_PARENT, $throwExceptions = true)
+    {
+        if (!is_array($privileges)) {
+            $privileges = [$privileges];
+        }
 
         $acl = $this->getCurrentUserPrivilegeSet($uri);
 
         $failed = [];
         foreach ($privileges as $priv) {
-
             if (!in_array($priv, $acl)) {
                 $failed[] = $priv;
             }
-
         }
 
         if ($failed) {
@@ -213,17 +214,16 @@ class Plugin extends DAV\ServerPlugin {
                     $this->server->httpRequest,
                     $this->server->httpResponse
                 );
-                throw new notAuthenticated(implode(', ', $reasons) . '. Login was needed for privilege: ' . implode(', ', $failed) . ' on ' . $uri);
+                throw new notAuthenticated(implode(', ', $reasons).'. Login was needed for privilege: '.implode(', ', $failed).' on '.$uri);
             }
             if ($throwExceptions) {
-
                 throw new NeedPrivileges($uri, $failed);
             } else {
                 return false;
             }
         }
-        return true;
 
+        return true;
     }
 
     /**
@@ -234,35 +234,35 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return string|null
      */
-    function getCurrentUserPrincipal() {
-
+    public function getCurrentUserPrincipal()
+    {
         /** @var $authPlugin \Sabre\DAV\Auth\Plugin */
         $authPlugin = $this->server->getPlugin('auth');
         if (!$authPlugin) {
             return null;
         }
-        return $authPlugin->getCurrentPrincipal();
 
+        return $authPlugin->getCurrentPrincipal();
     }
 
-
     /**
      * Returns a list of principals that's associated to the current
      * user, either directly or through group membership.
      *
      * @return array
      */
-    function getCurrentUserPrincipals() {
-
+    public function getCurrentUserPrincipals()
+    {
         $currentUser = $this->getCurrentUserPrincipal();
 
-        if (is_null($currentUser)) return [];
+        if (is_null($currentUser)) {
+            return [];
+        }
 
         return array_merge(
             [$currentUser],
             $this->getPrincipalMembership($currentUser)
         );
-
     }
 
     /**
@@ -271,12 +271,10 @@ class Plugin extends DAV\ServerPlugin {
      * These rules are used for all nodes that don't implement the IACL interface.
      *
      * @param array $acl
-     * @return void
      */
-    function setDefaultAcl(array $acl) {
-
+    public function setDefaultAcl(array $acl)
+    {
         $this->defaultAcl = $acl;
-
     }
 
     /**
@@ -286,10 +284,9 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getDefaultAcl() {
-
+    public function getDefaultAcl()
+    {
         return $this->defaultAcl;
-
     }
 
     /**
@@ -317,15 +314,15 @@ class Plugin extends DAV\ServerPlugin {
      */
     protected $principalMembershipCache = [];
 
-
     /**
      * Returns all the principal groups the specified principal is a member of.
      *
      * @param string $mainPrincipal
+     *
      * @return array
      */
-    function getPrincipalMembership($mainPrincipal) {
-
+    public function getPrincipalMembership($mainPrincipal)
+    {
         // First check our cache
         if (isset($this->principalMembershipCache[$mainPrincipal])) {
             return $this->principalMembershipCache[$mainPrincipal];
@@ -335,31 +332,23 @@ class Plugin extends DAV\ServerPlugin {
         $principals = [];
 
         while (count($check)) {
-
             $principal = array_shift($check);
 
             $node = $this->server->tree->getNodeForPath($principal);
             if ($node instanceof IPrincipal) {
                 foreach ($node->getGroupMembership() as $groupMember) {
-
                     if (!in_array($groupMember, $principals)) {
-
                         $check[] = $groupMember;
                         $principals[] = $groupMember;
-
                     }
-
                 }
-
             }
-
         }
 
         // Store the result in the cache
         $this->principalMembershipCache[$mainPrincipal] = $principals;
 
         return $principals;
-
     }
 
     /**
@@ -381,24 +370,27 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @param string $checkPrincipal
      * @param string $currentPrincipal
+     *
      * @return bool
      */
-    function principalMatchesPrincipal($checkPrincipal, $currentPrincipal = null) {
-
+    public function principalMatchesPrincipal($checkPrincipal, $currentPrincipal = null)
+    {
         if (is_null($currentPrincipal)) {
             $currentPrincipal = $this->getCurrentUserPrincipal();
         }
         if ($currentPrincipal === $checkPrincipal) {
             return true;
         }
+        if (is_null($currentPrincipal)) {
+            return false;
+        }
+
         return in_array(
             $checkPrincipal,
             $this->getPrincipalMembership($currentPrincipal)
         );
-
     }
 
-
     /**
      * Returns a tree of supported privileges for a resource.
      *
@@ -436,10 +428,11 @@ class Plugin extends DAV\ServerPlugin {
      * ]
      *
      * @param string|INode $node
+     *
      * @return array
      */
-    function getSupportedPrivilegeSet($node) {
-
+    public function getSupportedPrivilegeSet($node)
+    {
         if (is_string($node)) {
             $node = $this->server->tree->getNodeForPath($node);
         }
@@ -450,35 +443,34 @@ class Plugin extends DAV\ServerPlugin {
         }
 
         if (is_null($supportedPrivileges)) {
-
             // Default
             $supportedPrivileges = [
                 '{DAV:}read' => [
-                    'abstract'   => false,
+                    'abstract' => false,
                     'aggregates' => [
                         '{DAV:}read-acl' => [
-                            'abstract'   => false,
+                            'abstract' => false,
                             'aggregates' => [],
                         ],
                         '{DAV:}read-current-user-privilege-set' => [
-                            'abstract'   => false,
+                            'abstract' => false,
                             'aggregates' => [],
                         ],
                     ],
                 ],
                 '{DAV:}write' => [
-                    'abstract'   => false,
+                    'abstract' => false,
                     'aggregates' => [
                         '{DAV:}write-properties' => [
-                            'abstract'   => false,
+                            'abstract' => false,
                             'aggregates' => [],
                         ],
                         '{DAV:}write-content' => [
-                            'abstract'   => false,
+                            'abstract' => false,
                             'aggregates' => [],
                         ],
                         '{DAV:}unlock' => [
-                            'abstract'   => false,
+                            'abstract' => false,
                             'aggregates' => [],
                         ],
                     ],
@@ -486,21 +478,20 @@ class Plugin extends DAV\ServerPlugin {
             ];
             if ($node instanceof DAV\ICollection) {
                 $supportedPrivileges['{DAV:}write']['aggregates']['{DAV:}bind'] = [
-                    'abstract'   => false,
+                    'abstract' => false,
                     'aggregates' => [],
                 ];
                 $supportedPrivileges['{DAV:}write']['aggregates']['{DAV:}unbind'] = [
-                    'abstract'   => false,
+                    'abstract' => false,
                     'aggregates' => [],
                 ];
             }
             if ($node instanceof IACL) {
                 $supportedPrivileges['{DAV:}write']['aggregates']['{DAV:}write-acl'] = [
-                    'abstract'   => false,
+                    'abstract' => false,
                     'aggregates' => [],
                 ];
             }
-
         }
 
         $this->server->emit(
@@ -509,11 +500,10 @@ class Plugin extends DAV\ServerPlugin {
         );
 
         return $supportedPrivileges;
-
     }
 
     /**
-     * Returns the supported privilege set as a flat list
+     * Returns the supported privilege set as a flat list.
      *
      * This is much easier to parse.
      *
@@ -524,54 +514,44 @@ class Plugin extends DAV\ServerPlugin {
      *   - concrete
      *
      * @param string|INode $node
+     *
      * @return array
      */
-    final function getFlatPrivilegeSet($node) {
-
+    final public function getFlatPrivilegeSet($node)
+    {
         $privs = [
-            'abstract'   => false,
-            'aggregates' => $this->getSupportedPrivilegeSet($node)
+            'abstract' => false,
+            'aggregates' => $this->getSupportedPrivilegeSet($node),
         ];
 
         $fpsTraverse = null;
-        $fpsTraverse = function($privName, $privInfo, $concrete, &$flat) use (&$fpsTraverse) {
-
+        $fpsTraverse = function ($privName, $privInfo, $concrete, &$flat) use (&$fpsTraverse) {
             $myPriv = [
-                'privilege'  => $privName,
-                'abstract'   => isset($privInfo['abstract']) && $privInfo['abstract'],
+                'privilege' => $privName,
+                'abstract' => isset($privInfo['abstract']) && $privInfo['abstract'],
                 'aggregates' => [],
-                'concrete'   => isset($privInfo['abstract']) && $privInfo['abstract'] ? $concrete : $privName,
+                'concrete' => isset($privInfo['abstract']) && $privInfo['abstract'] ? $concrete : $privName,
             ];
 
             if (isset($privInfo['aggregates'])) {
-
                 foreach ($privInfo['aggregates'] as $subPrivName => $subPrivInfo) {
-
                     $myPriv['aggregates'][] = $subPrivName;
-
                 }
-
             }
 
             $flat[$privName] = $myPriv;
 
             if (isset($privInfo['aggregates'])) {
-
                 foreach ($privInfo['aggregates'] as $subPrivName => $subPrivInfo) {
-
                     $fpsTraverse($subPrivName, $subPrivInfo, $myPriv['concrete'], $flat);
-
                 }
-
             }
-
         };
 
         $flat = [];
         $fpsTraverse('{DAV:}all', $privs, null, $flat);
 
         return $flat;
-
     }
 
     /**
@@ -582,10 +562,11 @@ class Plugin extends DAV\ServerPlugin {
      * null will be returned if the node doesn't support ACLs.
      *
      * @param string|DAV\INode $node
+     *
      * @return array
      */
-    function getAcl($node) {
-
+    public function getAcl($node)
+    {
         if (is_string($node)) {
             $node = $this->server->tree->getNodeForPath($node);
         }
@@ -600,8 +581,8 @@ class Plugin extends DAV\ServerPlugin {
                 'protected' => true,
             ];
         }
-        return $acl;
 
+        return $acl;
     }
 
     /**
@@ -613,10 +594,11 @@ class Plugin extends DAV\ServerPlugin {
      * null will be returned if the node doesn't support ACLs.
      *
      * @param string|DAV\INode $node
+     *
      * @return array
      */
-    function getCurrentUserPrivilegeSet($node) {
-
+    public function getCurrentUserPrivilegeSet($node)
+    {
         if (is_string($node)) {
             $node = $this->server->tree->getNodeForPath($node);
         }
@@ -625,50 +607,44 @@ class Plugin extends DAV\ServerPlugin {
 
         $collected = [];
 
-        $isAuthenticated = $this->getCurrentUserPrincipal() !== null;
+        $isAuthenticated = null !== $this->getCurrentUserPrincipal();
 
         foreach ($acl as $ace) {
-
             $principal = $ace['principal'];
 
             switch ($principal) {
-
-                case '{DAV:}owner' :
+                case '{DAV:}owner':
                     $owner = $node->getOwner();
                     if ($owner && $this->principalMatchesPrincipal($owner)) {
                         $collected[] = $ace;
                     }
                     break;
 
-
                 // 'all' matches for every user
-                case '{DAV:}all' :
+                case '{DAV:}all':
                     $collected[] = $ace;
                     break;
 
-                case '{DAV:}authenticated' :
+                case '{DAV:}authenticated':
                     // Authenticated users only
                     if ($isAuthenticated) {
                         $collected[] = $ace;
                     }
                     break;
 
-                case '{DAV:}unauthenticated' :
+                case '{DAV:}unauthenticated':
                     // Unauthenticated users only
                     if (!$isAuthenticated) {
                         $collected[] = $ace;
                     }
                     break;
 
-                default :
+                default:
                     if ($this->principalMatchesPrincipal($ace['principal'])) {
                         $collected[] = $ace;
                     }
                     break;
-
             }
-
-
         }
 
         // Now we deduct all aggregated privileges.
@@ -676,41 +652,37 @@ class Plugin extends DAV\ServerPlugin {
 
         $collected2 = [];
         while (count($collected)) {
-
             $current = array_pop($collected);
             $collected2[] = $current['privilege'];
 
             if (!isset($flat[$current['privilege']])) {
                 // Ignoring privileges that are not in the supported-privileges list.
-                $this->server->getLogger()->debug('A node has the "' . $current['privilege'] . '" in its ACL list, but this privilege was not reported in the supportedPrivilegeSet list. This will be ignored.');
+                $this->server->getLogger()->debug('A node has the "'.$current['privilege'].'" in its ACL list, but this privilege was not reported in the supportedPrivilegeSet list. This will be ignored.');
                 continue;
             }
             foreach ($flat[$current['privilege']]['aggregates'] as $subPriv) {
                 $collected2[] = $subPriv;
                 $collected[] = $flat[$subPriv];
             }
-
         }
 
         return array_values(array_unique($collected2));
-
     }
 
-
     /**
      * Returns a principal based on its uri.
      *
      * Returns null if the principal could not be found.
      *
      * @param string $uri
-     * @return null|string
+     *
+     * @return string|null
      */
-    function getPrincipalByUri($uri) {
-
+    public function getPrincipalByUri($uri)
+    {
         $result = null;
         $collections = $this->principalCollectionSet;
         foreach ($collections as $collection) {
-
             try {
                 $principalCollection = $this->server->tree->getNodeForPath($collection);
             } catch (NotFound $e) {
@@ -728,36 +700,35 @@ class Plugin extends DAV\ServerPlugin {
             if ($result) {
                 return $result;
             }
-
         }
-
     }
 
     /**
-     * Principal property search
+     * Principal property search.
      *
      * This method can search for principals matching certain values in
      * properties.
      *
      * This method will return a list of properties for the matched properties.
      *
-     * @param array $searchProperties    The properties to search on. This is a
-     *                                   key-value list. The keys are property
-     *                                   names, and the values the strings to
-     *                                   match them on.
-     * @param array $requestedProperties This is the list of properties to
-     *                                   return for every match.
-     * @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.
+     * @param array  $searchProperties    The properties to search on. This is a
+     *                                    key-value list. The keys are property
+     *                                    names, and the values the strings to
+     *                                    match them on.
+     * @param array  $requestedProperties this is the list of properties to
+     *                                    return for every match
+     * @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.
      */
-    function principalSearch(array $searchProperties, array $requestedProperties, $collectionUri = null, $test = 'allof') {
-
+    public function principalSearch(array $searchProperties, array $requestedProperties, $collectionUri = null, $test = 'allof')
+    {
         if (!is_null($collectionUri)) {
             $uris = [$collectionUri];
         } else {
@@ -766,7 +737,6 @@ class Plugin extends DAV\ServerPlugin {
 
         $lookupResults = [];
         foreach ($uris as $uri) {
-
             $principalCollection = $this->server->tree->getNodeForPath($uri);
             if (!$principalCollection instanceof IPrincipalCollection) {
                 // Not a principal collection, we're simply going to ignore
@@ -776,33 +746,28 @@ class Plugin extends DAV\ServerPlugin {
 
             $results = $principalCollection->searchPrincipals($searchProperties, $test);
             foreach ($results as $result) {
-                $lookupResults[] = rtrim($uri, '/') . '/' . $result;
+                $lookupResults[] = rtrim($uri, '/').'/'.$result;
             }
-
         }
 
         $matches = [];
 
         foreach ($lookupResults as $lookupResult) {
-
             list($matches[]) = $this->server->getPropertiesForPath($lookupResult, $requestedProperties, 0);
-
         }
 
         return $matches;
-
     }
 
     /**
-     * Sets up the plugin
+     * Sets up the plugin.
      *
      * This method is automatically called by the server class.
      *
      * @param DAV\Server $server
-     * @return void
      */
-    function initialize(DAV\Server $server) {
-
+    public function initialize(DAV\Server $server)
+    {
         if ($this->allowUnauthenticatedAccess) {
             $authPlugin = $server->getPlugin('auth');
             if (!$authPlugin) {
@@ -812,22 +777,22 @@ class Plugin extends DAV\ServerPlugin {
         }
 
         $this->server = $server;
-        $server->on('propFind',            [$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']);
-        $server->on('getPrincipalByUri',  function($principal, &$uri) {
-
+        $server->on('propFind', [$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']);
+        $server->on('getPrincipalByUri', function ($principal, &$uri) {
             $uri = $this->getPrincipalByUri($principal);
 
             // Break event chain
-            if ($uri) return false;
-
+            if ($uri) {
+                return false;
+            }
         });
 
         array_push($server->protectedProperties,
@@ -858,39 +823,38 @@ class Plugin extends DAV\ServerPlugin {
         $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';
         $server->xml->elementMap['{DAV:}principal-match'] = 'Sabre\\DAVACL\\Xml\\Request\\PrincipalMatchReport';
-
     }
 
     /* {{{ Event handlers */
 
     /**
-     * Triggered before any method is handled
+     * Triggered before any method is handled.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
-     * @return void
      */
-    function beforeMethod(RequestInterface $request, ResponseInterface $response) {
-
+    public function beforeMethod(RequestInterface $request, ResponseInterface $response)
+    {
         $method = $request->getMethod();
         $path = $request->getPath();
 
         $exists = $this->server->tree->nodeExists($path);
 
         // If the node doesn't exists, none of these checks apply
-        if (!$exists) return;
+        if (!$exists) {
+            return;
+        }
 
         switch ($method) {
-
-            case 'GET' :
-            case 'HEAD' :
-            case 'OPTIONS' :
+            case 'GET':
+            case 'HEAD':
+            case 'OPTIONS':
                 // For these 3 we only need to know if the node is readable.
                 $this->checkPrivileges($path, '{DAV:}read');
                 break;
 
-            case 'PUT' :
-            case 'LOCK' :
+            case 'PUT':
+            case 'LOCK':
                 // This method requires the write-content priv if the node
                 // already exists, and bind on the parent if the node is being
                 // created.
@@ -898,20 +862,20 @@ class Plugin extends DAV\ServerPlugin {
                 $this->checkPrivileges($path, '{DAV:}write-content');
                 break;
 
-            case 'UNLOCK' :
+            case 'UNLOCK':
                 // Unlock is always allowed at the moment.
                 break;
 
-            case 'PROPPATCH' :
+            case 'PROPPATCH':
                 $this->checkPrivileges($path, '{DAV:}write-properties');
                 break;
 
-            case 'ACL' :
+            case 'ACL':
                 $this->checkPrivileges($path, '{DAV:}write-acl');
                 break;
 
-            case 'COPY' :
-            case 'MOVE' :
+            case 'COPY':
+            case 'MOVE':
                 // Copy requires read privileges on the entire source tree.
                 // If the target exists write-content normally needs to be
                 // checked, however, we're deleting the node beforehand and
@@ -925,9 +889,7 @@ class Plugin extends DAV\ServerPlugin {
                 // the sourcenode can be deleted.
                 $this->checkPrivileges($path, '{DAV:}read', self::R_RECURSIVE);
                 break;
-
         }
-
     }
 
     /**
@@ -937,54 +899,49 @@ class Plugin extends DAV\ServerPlugin {
      * new node, such as PUT, MKCOL, MKCALENDAR, LOCK, COPY and MOVE.
      *
      * @param string $uri
-     * @return void
      */
-    function beforeBind($uri) {
-
+    public function beforeBind($uri)
+    {
         list($parentUri) = Uri\split($uri);
         $this->checkPrivileges($parentUri, '{DAV:}bind');
-
     }
 
     /**
-     * Triggered before a node is deleted
+     * Triggered before a node is deleted.
      *
      * This allows us to check permissions for any operation that will delete
      * an existing node.
      *
      * @param string $uri
-     * @return void
      */
-    function beforeUnbind($uri) {
-
+    public function beforeUnbind($uri)
+    {
         list($parentUri) = Uri\split($uri);
         $this->checkPrivileges($parentUri, '{DAV:}unbind', self::R_RECURSIVEPARENTS);
-
     }
 
     /**
      * Triggered before a node is unlocked.
      *
-     * @param string $uri
+     * @param string             $uri
      * @param DAV\Locks\LockInfo $lock
      * @TODO: not yet implemented
-     * @return void
      */
-    function beforeUnlock($uri, DAV\Locks\LockInfo $lock) {
-
-
+    public function beforeUnlock($uri, DAV\Locks\LockInfo $lock)
+    {
     }
 
     /**
      * Triggered before properties are looked up in specific nodes.
      *
      * @param DAV\PropFind $propFind
-     * @param DAV\INode $node
+     * @param DAV\INode    $node
      * @TODO really should be broken into multiple methods, or even a class.
+     *
      * @return bool
      */
-    function propFind(DAV\PropFind $propFind, DAV\INode $node) {
-
+    public function propFind(DAV\PropFind $propFind, DAV\INode $node)
+    {
         $path = $propFind->getPath();
 
         // Checking the read permission
@@ -1004,95 +961,95 @@ class Plugin extends DAV\ServerPlugin {
             }
 
             return;
-
         }
 
         /* Adding principal properties */
         if ($node instanceof IPrincipal) {
-
-            $propFind->handle('{DAV:}alternate-URI-set', function() use ($node) {
+            $propFind->handle('{DAV:}alternate-URI-set', function () use ($node) {
                 return new Href($node->getAlternateUriSet());
             });
-            $propFind->handle('{DAV:}principal-URL', function() use ($node) {
-                return new Href($node->getPrincipalUrl() . '/');
+            $propFind->handle('{DAV:}principal-URL', function () use ($node) {
+                return new Href($node->getPrincipalUrl().'/');
             });
-            $propFind->handle('{DAV:}group-member-set', function() use ($node) {
+            $propFind->handle('{DAV:}group-member-set', function () use ($node) {
                 $members = $node->getGroupMemberSet();
                 foreach ($members as $k => $member) {
-                    $members[$k] = rtrim($member, '/') . '/';
+                    $members[$k] = rtrim($member, '/').'/';
                 }
+
                 return new Href($members);
             });
-            $propFind->handle('{DAV:}group-membership', function() use ($node) {
+            $propFind->handle('{DAV:}group-membership', function () use ($node) {
                 $members = $node->getGroupMembership();
                 foreach ($members as $k => $member) {
-                    $members[$k] = rtrim($member, '/') . '/';
+                    $members[$k] = rtrim($member, '/').'/';
                 }
+
                 return new Href($members);
             });
             $propFind->handle('{DAV:}displayname', [$node, 'getDisplayName']);
-
         }
 
-        $propFind->handle('{DAV:}principal-collection-set', function() {
-
+        $propFind->handle('{DAV:}principal-collection-set', function () {
             $val = $this->principalCollectionSet;
             // Ensuring all collections end with a slash
-            foreach ($val as $k => $v) $val[$k] = $v . '/';
-            return new Href($val);
+            foreach ($val as $k => $v) {
+                $val[$k] = $v.'/';
+            }
 
+            return new Href($val);
         });
-        $propFind->handle('{DAV:}current-user-principal', function() {
+        $propFind->handle('{DAV:}current-user-principal', function () {
             if ($url = $this->getCurrentUserPrincipal()) {
-                return new Xml\Property\Principal(Xml\Property\Principal::HREF, $url . '/');
+                return new Xml\Property\Principal(Xml\Property\Principal::HREF, $url.'/');
             } else {
                 return new Xml\Property\Principal(Xml\Property\Principal::UNAUTHENTICATED);
             }
         });
-        $propFind->handle('{DAV:}supported-privilege-set', function() use ($node) {
+        $propFind->handle('{DAV:}supported-privilege-set', function () use ($node) {
             return new Xml\Property\SupportedPrivilegeSet($this->getSupportedPrivilegeSet($node));
         });
-        $propFind->handle('{DAV:}current-user-privilege-set', function() use ($node, $propFind, $path) {
+        $propFind->handle('{DAV:}current-user-privilege-set', function () use ($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);
+
                 return new Xml\Property\CurrentUserPrivilegeSet($val);
             }
         });
-        $propFind->handle('{DAV:}acl', function() use ($node, $propFind, $path) {
+        $propFind->handle('{DAV:}acl', function () use ($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);
+
                 return new Xml\Property\Acl($this->getACL($node));
             }
         });
-        $propFind->handle('{DAV:}acl-restrictions', function() {
+        $propFind->handle('{DAV:}acl-restrictions', function () {
             return new Xml\Property\AclRestrictions();
         });
 
         /* Adding ACL properties */
         if ($node instanceof IACL) {
-            $propFind->handle('{DAV:}owner', function() use ($node) {
-                return new Href($node->getOwner() . '/');
+            $propFind->handle('{DAV:}owner', function () use ($node) {
+                return new Href($node->getOwner().'/');
             });
         }
-
     }
 
     /**
      * This method intercepts PROPPATCH methods and make sure the
      * group-member-set is updated correctly.
      *
-     * @param string $path
+     * @param string        $path
      * @param DAV\PropPatch $propPatch
-     * @return void
      */
-    function propPatch($path, DAV\PropPatch $propPatch) {
-
-        $propPatch->handle('{DAV:}group-member-set', function($value) use ($path) {
+    public function propPatch($path, DAV\PropPatch $propPatch)
+    {
+        $propPatch->handle('{DAV:}group-member-set', function ($value) use ($path) {
             if (is_null($value)) {
                 $memberSet = [];
             } elseif ($value instanceof Href) {
@@ -1116,55 +1073,58 @@ class Plugin extends DAV\ServerPlugin {
 
             return true;
         });
-
     }
 
     /**
-     * This method handles HTTP REPORT requests
+     * This method handles HTTP REPORT requests.
      *
      * @param string $reportName
-     * @param mixed $report
-     * @param mixed $path
+     * @param mixed  $report
+     * @param mixed  $path
+     *
      * @return bool
      */
-    function report($reportName, $report, $path) {
-
+    public function report($reportName, $report, $path)
+    {
         switch ($reportName) {
-
-            case '{DAV:}principal-property-search' :
+            case '{DAV:}principal-property-search':
                 $this->server->transactionType = 'report-principal-property-search';
                 $this->principalPropertySearchReport($path, $report);
+
                 return false;
-            case '{DAV:}principal-search-property-set' :
+            case '{DAV:}principal-search-property-set':
                 $this->server->transactionType = 'report-principal-search-property-set';
                 $this->principalSearchPropertySetReport($path, $report);
+
                 return false;
-            case '{DAV:}expand-property' :
+            case '{DAV:}expand-property':
                 $this->server->transactionType = 'report-expand-property';
                 $this->expandPropertyReport($path, $report);
+
                 return false;
-            case '{DAV:}principal-match' :
+            case '{DAV:}principal-match':
                 $this->server->transactionType = 'report-principal-match';
                 $this->principalMatchReport($path, $report);
+
                 return false;
-            case '{DAV:}acl-principal-prop-set' :
+            case '{DAV:}acl-principal-prop-set':
                 $this->server->transactionType = 'acl-principal-prop-set';
                 $this->aclPrincipalPropSetReport($path, $report);
-                return false;
 
+                return false;
         }
-
     }
 
     /**
      * This method is responsible for handling the 'ACL' event.
      *
-     * @param RequestInterface $request
+     * @param RequestInterface  $request
      * @param ResponseInterface $response
+     *
      * @return bool
      */
-    function httpAcl(RequestInterface $request, ResponseInterface $response) {
-
+    public function httpAcl(RequestInterface $request, ResponseInterface $response)
+    {
         $path = $request->getPath();
         $body = $request->getBodyAsString();
 
@@ -1192,8 +1152,9 @@ class Plugin extends DAV\ServerPlugin {
         /* Checking if protected principals from the existing principal set are
            not overwritten. */
         foreach ($oldAcl as $oldAce) {
-
-            if (!isset($oldAce['protected']) || !$oldAce['protected']) continue;
+            if (!isset($oldAce['protected']) || !$oldAce['protected']) {
+                continue;
+            }
 
             $found = false;
             foreach ($newAcl as $newAce) {
@@ -1201,36 +1162,35 @@ class Plugin extends DAV\ServerPlugin {
                     $newAce['privilege'] === $oldAce['privilege'] &&
                     $newAce['principal'] === $oldAce['principal'] &&
                     $newAce['protected']
-                )
-                $found = true;
+                ) {
+                    $found = true;
+                }
             }
 
-            if (!$found)
+            if (!$found) {
                 throw new Exception\AceConflict('This resource contained a protected {DAV:}ace, but this privilege did not occur in the ACL request');
-
+            }
         }
 
         foreach ($newAcl as $newAce) {
-
             // Do we recognize the privilege
             if (!isset($supportedPrivileges[$newAce['privilege']])) {
-                throw new Exception\NotSupportedPrivilege('The privilege you specified (' . $newAce['privilege'] . ') is not recognized by this server');
+                throw new Exception\NotSupportedPrivilege('The privilege you specified ('.$newAce['privilege'].') is not recognized by this server');
             }
 
             if ($supportedPrivileges[$newAce['privilege']]['abstract']) {
-                throw new Exception\NoAbstract('The privilege you specified (' . $newAce['privilege'] . ') is an abstract privilege');
+                throw new Exception\NoAbstract('The privilege you specified ('.$newAce['privilege'].') is an abstract privilege');
             }
 
             // Looking up the principal
             try {
                 $principal = $this->server->tree->getNodeForPath($newAce['principal']);
             } catch (NotFound $e) {
-                throw new Exception\NotRecognizedPrincipal('The specified principal (' . $newAce['principal'] . ') does not exist');
+                throw new Exception\NotRecognizedPrincipal('The specified principal ('.$newAce['principal'].') does not exist');
             }
             if (!($principal instanceof IPrincipal)) {
-                throw new Exception\NotRecognizedPrincipal('The specified uri (' . $newAce['principal'] . ') is not a principal');
+                throw new Exception\NotRecognizedPrincipal('The specified uri ('.$newAce['principal'].') is not a principal');
             }
-
         }
         $node->setACL($newAcl);
 
@@ -1238,7 +1198,6 @@ class Plugin extends DAV\ServerPlugin {
 
         // Breaking the event chain, because we handled this method.
         return false;
-
     }
 
     /* }}} */
@@ -1252,14 +1211,13 @@ class Plugin extends DAV\ServerPlugin {
      * or a principal URL, the principal URL and principal URLs of groups that
      * principal belongs to.
      *
-     * @param string $path
+     * @param string                           $path
      * @param Xml\Request\PrincipalMatchReport $report
-     * @return void
      */
-    protected function principalMatchReport($path, Xml\Request\PrincipalMatchReport $report) {
-
+    protected function principalMatchReport($path, Xml\Request\PrincipalMatchReport $report)
+    {
         $depth = $this->server->getHTTPDepth(0);
-        if ($depth !== 0) {
+        if (0 !== $depth) {
             throw new BadRequest('The principal-match report is only defined on Depth: 0');
         }
 
@@ -1267,20 +1225,15 @@ class Plugin extends DAV\ServerPlugin {
 
         $result = [];
 
-        if ($report->type === Xml\Request\PrincipalMatchReport::SELF) {
-
+        if (Xml\Request\PrincipalMatchReport::SELF === $report->type) {
             // Finding all principals under the request uri that match the
             // current principal.
             foreach ($currentPrincipals as $currentPrincipal) {
-
-                if ($currentPrincipal === $path || strpos($currentPrincipal, $path . '/') === 0) {
+                if ($currentPrincipal === $path || 0 === strpos($currentPrincipal, $path.'/')) {
                     $result[] = $currentPrincipal;
                 }
-
             }
-
         } else {
-
             // We need to find all resources that have a property that matches
             // one of the current principals.
             $candidates = $this->server->getPropertiesForPath(
@@ -1290,7 +1243,6 @@ class Plugin extends DAV\ServerPlugin {
             );
 
             foreach ($candidates as $candidate) {
-
                 if (!isset($candidate[200][$report->principalProperty])) {
                     continue;
                 }
@@ -1308,23 +1260,19 @@ class Plugin extends DAV\ServerPlugin {
                     }
                 }
             }
-
         }
 
         $responses = [];
 
         foreach ($result as $item) {
-
             $properties = [];
 
             if ($report->properties) {
-
                 $foo = $this->server->getPropertiesForPath($item, $report->properties);
                 $foo = $foo[0];
                 $item = $foo['href'];
                 unset($foo['href']);
                 $properties = $foo;
-
             }
 
             $responses[] = new DAV\Xml\Element\Response(
@@ -1332,7 +1280,6 @@ class Plugin extends DAV\ServerPlugin {
                 $properties,
                 '200'
             );
-
         }
 
         $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
@@ -1344,8 +1291,6 @@ class Plugin extends DAV\ServerPlugin {
                 $this->server->getBaseUri()
             )
         );
-
-
     }
 
     /**
@@ -1359,12 +1304,11 @@ 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 string $path
+     * @param string                           $path
      * @param Xml\Request\ExpandPropertyReport $report
-     * @return void
      */
-    protected function expandPropertyReport($path, $report) {
-
+    protected function expandPropertyReport($path, $report)
+    {
         $depth = $this->server->getHTTPDepth(0);
 
         $result = $this->expandProperties($path, $report->properties, $depth);
@@ -1377,34 +1321,36 @@ class Plugin extends DAV\ServerPlugin {
         $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
         $this->server->httpResponse->setStatus(207);
         $this->server->httpResponse->setBody($xml);
-
     }
 
     /**
      * This method expands all the properties and returns
-     * a list with property values
+     * a list with property values.
      *
      * @param array $path
      * @param array $requestedProperties the list of required properties
-     * @param int $depth
+     * @param int   $depth
+     *
      * @return array
      */
-    protected function expandProperties($path, array $requestedProperties, $depth) {
-
+    protected function expandProperties($path, array $requestedProperties, $depth)
+    {
         $foundProperties = $this->server->getPropertiesForPath($path, array_keys($requestedProperties), $depth);
 
         $result = [];
 
         foreach ($foundProperties as $node) {
-
             foreach ($requestedProperties as $propertyName => $childRequestedProperties) {
-
                 // We're only traversing if sub-properties were requested
-                if (count($childRequestedProperties) === 0) continue;
+                if (!is_array($childRequestedProperties) || 0 === count($childRequestedProperties)) {
+                    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\Xml\Property\Href) {
                     continue;
@@ -1416,39 +1362,35 @@ class Plugin extends DAV\ServerPlugin {
                 foreach ($childHrefs as $href) {
                     // Gathering the result of the children
                     $childProps[] = [
-                        'name'  => '{DAV:}response',
-                        'value' => $this->expandProperties($href, $childRequestedProperties, 0)[0]
+                        'name' => '{DAV:}response',
+                        'value' => $this->expandProperties($href, $childRequestedProperties, 0)[0],
                     ];
                 }
 
                 // Replacing the property with its expanded form.
                 $node[200][$propertyName] = $childProps;
-
             }
             $result[] = new DAV\Xml\Element\Response($node['href'], $node);
-
         }
 
         return $result;
-
     }
 
     /**
-     * principalSearchPropertySetReport
+     * principalSearchPropertySetReport.
      *
      * This method responsible for handing the
      * {DAV:}principal-search-property-set report. This report returns a list
      * of properties the client may search on, using the
      * {DAV:}principal-property-search report.
      *
-     * @param string $path
+     * @param string                                       $path
      * @param Xml\Request\PrincipalSearchPropertySetReport $report
-     * @return void
      */
-    protected function principalSearchPropertySetReport($path, $report) {
-
+    protected function principalSearchPropertySetReport($path, $report)
+    {
         $httpDepth = $this->server->getHTTPDepth(0);
-        if ($httpDepth !== 0) {
+        if (0 !== $httpDepth) {
             throw new DAV\Exception\BadRequest('This report is only defined when Depth: 0');
         }
 
@@ -1459,7 +1401,6 @@ class Plugin extends DAV\ServerPlugin {
         $writer->startElement('{DAV:}principal-search-property-set');
 
         foreach ($this->principalSearchPropertySet as $propertyName => $description) {
-
             $writer->startElement('{DAV:}principal-search-property');
             $writer->startElement('{DAV:}prop');
 
@@ -1469,15 +1410,13 @@ class Plugin extends DAV\ServerPlugin {
 
             if ($description) {
                 $writer->write([[
-                    'name'       => '{DAV:}description',
-                    'value'      => $description,
-                    'attributes' => ['xml:lang' => 'en']
+                    'name' => '{DAV:}description',
+                    'value' => $description,
+                    'attributes' => ['xml:lang' => 'en'],
                 ]]);
             }
 
             $writer->endElement(); // principal-search-property
-
-
         }
 
         $writer->endElement(); // principal-search-property-set
@@ -1485,27 +1424,25 @@ class Plugin extends DAV\ServerPlugin {
         $this->server->httpResponse->setHeader('Content-Type', 'application/xml; charset=utf-8');
         $this->server->httpResponse->setStatus(200);
         $this->server->httpResponse->setBody($writer->outputMemory());
-
     }
 
     /**
-     * principalPropertySearchReport
+     * principalPropertySearchReport.
      *
      * This method is responsible for handing the
      * {DAV:}principal-property-search report. This report can be used for
      * clients to search for groups of principals, based on the value of one
      * or more properties.
      *
-     * @param string $path
+     * @param string                                    $path
      * @param Xml\Request\PrincipalPropertySearchReport $report
-     * @return void
      */
-    protected function principalPropertySearchReport($path, Xml\Request\PrincipalPropertySearchReport $report) {
-
+    protected function principalPropertySearchReport($path, Xml\Request\PrincipalPropertySearchReport $report)
+    {
         if ($report->applyToPrincipalCollectionSet) {
             $path = null;
         }
-        if ($this->server->getHttpDepth('0') !== 0) {
+        if (0 !== $this->server->getHttpDepth('0')) {
             throw new BadRequest('Depth must be 0');
         }
         $result = $this->principalSearch(
@@ -1520,12 +1457,11 @@ class Plugin extends DAV\ServerPlugin {
         $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'));
-
+        $this->server->httpResponse->setBody($this->server->generateMultiStatus($result, 'minimal' === $prefer['return']));
     }
 
     /**
-     * aclPrincipalPropSet REPORT
+     * aclPrincipalPropSet REPORT.
      *
      * This method is responsible for handling the {DAV:}acl-principal-prop-set
      * REPORT, as defined in:
@@ -1537,13 +1473,12 @@ class Plugin extends DAV\ServerPlugin {
      * is used to for example generate a UI with ACL rules, allowing you
      * to show names for principals for every entry.
      *
-     * @param string $path
+     * @param string                                $path
      * @param Xml\Request\AclPrincipalPropSetReport $report
-     * @return void
      */
-    protected function aclPrincipalPropSetReport($path, Xml\Request\AclPrincipalPropSetReport $report) {
-
-        if ($this->server->getHTTPDepth(0) !== 0) {
+    protected function aclPrincipalPropSetReport($path, Xml\Request\AclPrincipalPropSetReport $report)
+    {
+        if (0 !== $this->server->getHTTPDepth(0)) {
             throw new BadRequest('The {DAV:}acl-principal-prop-set REPORT only supports Depth 0');
         }
 
@@ -1558,14 +1493,12 @@ class Plugin extends DAV\ServerPlugin {
 
         $principals = [];
         foreach ($acl['{DAV:}acl']->getPrivileges() as $ace) {
-
-            if ($ace['principal'][0] === '{') {
+            if ('{' === $ace['principal'][0]) {
                 // It's not a principal, it's one of the special rules such as {DAV:}authenticated
                 continue;
             }
 
             $principals[] = $ace['principal'];
-
         }
 
         $properties = $this->server->getPropertiesForMultiplePaths(
@@ -1578,10 +1511,8 @@ class Plugin extends DAV\ServerPlugin {
         $this->server->httpResponse->setBody(
             $this->server->generateMultiStatus($properties)
         );
-
     }
 
-
     /* }}} */
 
     /**
@@ -1590,13 +1521,15 @@ class Plugin extends DAV\ServerPlugin {
      * can use to create new calendars.
      *
      * @param DAV\INode $node
-     * @param string $output
+     * @param string    $output
+     *
      * @return bool
      */
-    function htmlActionsPanel(DAV\INode $node, &$output) {
-
-        if (!$node instanceof PrincipalCollection)
+    public function htmlActionsPanel(DAV\INode $node, &$output)
+    {
+        if (!$node instanceof PrincipalCollection) {
             return;
+        }
 
         $output .= '<tr><td colspan="2"><form method="post" action="">
             <h3>Create new principal</h3>
@@ -1610,7 +1543,6 @@ class Plugin extends DAV\ServerPlugin {
             </td></tr>';
 
         return false;
-
     }
 
     /**
@@ -1624,13 +1556,12 @@ class Plugin extends DAV\ServerPlugin {
      *
      * @return array
      */
-    function getPluginInfo() {
-
+    public function getPluginInfo()
+    {
         return [
-            'name'        => $this->getPluginName(),
+            'name' => $this->getPluginName(),
             'description' => 'Adds support for WebDAV ACL (rfc3744)',
-            'link'        => 'http://sabre.io/dav/acl/',
+            'link' => 'http://sabre.io/dav/acl/',
         ];
-
     }
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Principal.php b/vendor/sabre/dav/lib/DAVACL/Principal.php
index d7db94999..e2df1c35e 100644
--- a/vendor/sabre/dav/lib/DAVACL/Principal.php
+++ b/vendor/sabre/dav/lib/DAVACL/Principal.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL;
 
 use Sabre\DAV;
-use Sabre\HTTP\URLUtil;
+use Sabre\Uri;
 
 /**
- * Principal class
+ * Principal class.
  *
  * This class is a representation of a simple principal
  *
@@ -20,8 +22,8 @@ use Sabre\HTTP\URLUtil;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
-
+class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL
+{
     use ACLTrait;
 
     /**
@@ -32,93 +34,86 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
     protected $principalProperties;
 
     /**
-     * Principal backend
+     * Principal backend.
      *
      * @var PrincipalBackend\BackendInterface
      */
     protected $principalBackend;
 
     /**
-     * Creates the principal object
+     * Creates the principal object.
      *
      * @param PrincipalBackend\BackendInterface $principalBackend
-     * @param array $principalProperties
+     * @param array                             $principalProperties
      */
-    function __construct(PrincipalBackend\BackendInterface $principalBackend, array $principalProperties = []) {
-
+    public 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');
         }
         $this->principalBackend = $principalBackend;
         $this->principalProperties = $principalProperties;
-
     }
 
     /**
-     * Returns the full principal url
+     * Returns the full principal url.
      *
      * @return string
      */
-    function getPrincipalUrl() {
-
+    public function getPrincipalUrl()
+    {
         return $this->principalProperties['uri'];
-
     }
 
     /**
-     * Returns a list of alternative urls for a principal
+     * Returns a list of alternative urls for a principal.
      *
      * This can for example be an email address, or ldap url.
      *
      * @return array
      */
-    function getAlternateUriSet() {
-
+    public function getAlternateUriSet()
+    {
         $uris = [];
         if (isset($this->principalProperties['{DAV:}alternate-URI-set'])) {
-
             $uris = $this->principalProperties['{DAV:}alternate-URI-set'];
-
         }
 
         if (isset($this->principalProperties['{http://sabredav.org/ns}email-address'])) {
-            $uris[] = 'mailto:' . $this->principalProperties['{http://sabredav.org/ns}email-address'];
+            $uris[] = 'mailto:'.$this->principalProperties['{http://sabredav.org/ns}email-address'];
         }
 
         return array_unique($uris);
-
     }
 
     /**
-     * Returns the list of group members
+     * Returns the list of group members.
      *
      * If this principal is a group, this function should return
      * all member principal uri's for the group.
      *
      * @return array
      */
-    function getGroupMemberSet() {
-
+    public function getGroupMemberSet()
+    {
         return $this->principalBackend->getGroupMemberSet($this->principalProperties['uri']);
-
     }
 
     /**
-     * Returns the list of groups this principal is member of
+     * Returns the list of groups this principal is member of.
      *
      * If this principal is a member of a (list of) groups, this function
      * should return a list of principal uri's for it's members.
      *
      * @return array
      */
-    function getGroupMembership() {
-
+    public function getGroupMembership()
+    {
         return $this->principalBackend->getGroupMemberShip($this->principalProperties['uri']);
-
     }
 
     /**
-     * Sets a list of group members
+     * Sets a list of group members.
      *
      * If this principal is a group, this method sets all the group members.
      * The list of members is always overwritten, never appended to.
@@ -126,12 +121,10 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      * This method should throw an exception if the members could not be set.
      *
      * @param array $groupMembers
-     * @return void
      */
-    function setGroupMemberSet(array $groupMembers) {
-
+    public function setGroupMemberSet(array $groupMembers)
+    {
         $this->principalBackend->setGroupMemberSet($this->principalProperties['uri'], $groupMembers);
-
     }
 
     /**
@@ -139,48 +132,45 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      *
      * @return string
      */
-    function getName() {
-
+    public function getName()
+    {
         $uri = $this->principalProperties['uri'];
-        list(, $name) = URLUtil::splitPath($uri);
-        return $name;
+        list(, $name) = Uri\split($uri);
 
+        return $name;
     }
 
     /**
-     * Returns the name of the user
+     * Returns the name of the user.
      *
      * @return string
      */
-    function getDisplayName() {
-
+    public function getDisplayName()
+    {
         if (isset($this->principalProperties['{DAV:}displayname'])) {
             return $this->principalProperties['{DAV:}displayname'];
         } else {
             return $this->getName();
         }
-
     }
 
     /**
-     * Returns a list of properties
+     * Returns a list of properties.
      *
      * @param array $requestedProperties
+     *
      * @return array
      */
-    function getProperties($requestedProperties) {
-
+    public function getProperties($requestedProperties)
+    {
         $newProperties = [];
         foreach ($requestedProperties as $propName) {
-
             if (isset($this->principalProperties[$propName])) {
                 $newProperties[$propName] = $this->principalProperties[$propName];
             }
-
         }
 
         return $newProperties;
-
     }
 
     /**
@@ -193,29 +183,24 @@ class Principal extends DAV\Node implements IPrincipal, DAV\IProperties, IACL {
      * Read the PropPatch documentation for more information.
      *
      * @param DAV\PropPatch $propPatch
-     * @return void
      */
-    function propPatch(DAV\PropPatch $propPatch) {
-
+    public function propPatch(DAV\PropPatch $propPatch)
+    {
         return $this->principalBackend->updatePrincipal(
             $this->principalProperties['uri'],
             $propPatch
         );
-
     }
 
     /**
-     * Returns the owner principal
+     * Returns the owner principal.
      *
      * This must be a url to a principal, or null if there's no owner
      *
      * @return string|null
      */
-    function getOwner() {
-
+    public function getOwner()
+    {
         return $this->principalProperties['uri'];
-
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php
index 9bf9ba445..03a9c4bad 100644
--- a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/AbstractBackend.php
@@ -1,9 +1,11 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\PrincipalBackend;
 
 /**
- * Abstract Principal Backend
+ * 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
@@ -13,8 +15,8 @@ namespace Sabre\DAVACL\PrincipalBackend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-abstract class AbstractBackend implements BackendInterface {
-
+abstract class AbstractBackend implements BackendInterface
+{
     /**
      * Finds a principal by its URI.
      *
@@ -30,13 +32,14 @@ abstract class AbstractBackend implements BackendInterface {
      *
      * @param string $uri
      * @param string $principalPrefix
+     *
      * @return string
      */
-    function findByUri($uri, $principalPrefix) {
-
+    public function findByUri($uri, $principalPrefix)
+    {
         // Note that the default implementation here is a bit slow and could
         // likely be optimized.
-        if (substr($uri, 0, 7) !== 'mailto:') {
+        if ('mailto:' !== substr($uri, 0, 7)) {
             return;
         }
         $result = $this->searchPrincipals(
@@ -47,7 +50,5 @@ abstract class AbstractBackend implements BackendInterface {
         if ($result) {
             return $result[0];
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
index 40b6e33ea..40ac272b5 100644
--- a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/BackendInterface.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\PrincipalBackend;
 
 /**
@@ -13,8 +15,8 @@ namespace Sabre\DAVACL\PrincipalBackend;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface BackendInterface {
-
+interface BackendInterface
+{
     /**
      * Returns a list of principals based on a prefix.
      *
@@ -29,9 +31,10 @@ interface BackendInterface {
      *     you have an email address, use this property.
      *
      * @param string $prefixPath
+     *
      * @return array
      */
-    function getPrincipalsByPrefix($prefixPath);
+    public function getPrincipalsByPrefix($prefixPath);
 
     /**
      * Returns a specific principal, specified by it's path.
@@ -39,9 +42,10 @@ interface BackendInterface {
      * getPrincipalsByPrefix.
      *
      * @param string $path
+     *
      * @return array
      */
-    function getPrincipalByPath($path);
+    public function getPrincipalByPath($path);
 
     /**
      * Updates one ore more webdav properties on a principal.
@@ -55,11 +59,10 @@ interface BackendInterface {
      *
      * Read the PropPatch documentation for more info and examples.
      *
-     * @param string $path
+     * @param string               $path
      * @param \Sabre\DAV\PropPatch $propPatch
-     * @return void
      */
-    function updatePrincipal($path, \Sabre\DAV\PropPatch $propPatch);
+    public function updatePrincipal($path, \Sabre\DAV\PropPatch $propPatch);
 
     /**
      * This method is used to search for principals matching a set of
@@ -86,11 +89,12 @@ interface BackendInterface {
      * from working.
      *
      * @param string $prefixPath
-     * @param array $searchProperties
+     * @param array  $searchProperties
      * @param string $test
+     *
      * @return array
      */
-    function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof');
+    public function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof');
 
     /**
      * Finds a principal by its URI.
@@ -107,25 +111,28 @@ interface BackendInterface {
      *
      * @param string $uri
      * @param string $principalPrefix
+     *
      * @return string
      */
-    function findByUri($uri, $principalPrefix);
+    public function findByUri($uri, $principalPrefix);
 
     /**
-     * Returns the list of members for a group-principal
+     * Returns the list of members for a group-principal.
      *
      * @param string $principal
+     *
      * @return array
      */
-    function getGroupMemberSet($principal);
+    public function getGroupMemberSet($principal);
 
     /**
-     * Returns the list of groups a principal is a member of
+     * Returns the list of groups a principal is a member of.
      *
      * @param string $principal
+     *
      * @return array
      */
-    function getGroupMembership($principal);
+    public function getGroupMembership($principal);
 
     /**
      * Updates the list of group members for a group principal.
@@ -133,9 +140,7 @@ interface BackendInterface {
      * The principals should be passed as a list of uri's.
      *
      * @param string $principal
-     * @param array $members
-     * @return void
+     * @param array  $members
      */
-    function setGroupMemberSet($principal, array $members);
-
+    public function setGroupMemberSet($principal, array $members);
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/CreatePrincipalSupport.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/CreatePrincipalSupport.php
index e354a697d..ee418e49b 100644
--- a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/CreatePrincipalSupport.php
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/CreatePrincipalSupport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\PrincipalBackend;
 
 use Sabre\DAV\MkCol;
@@ -12,8 +14,8 @@ use Sabre\DAV\MkCol;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-interface CreatePrincipalSupport extends BackendInterface {
-
+interface CreatePrincipalSupport extends BackendInterface
+{
     /**
      * Creates a new principal.
      *
@@ -22,9 +24,7 @@ interface CreatePrincipalSupport extends BackendInterface {
      * of the principal.
      *
      * @param string $path
-     * @param MkCol $mkCol
-     * @return void
+     * @param MkCol  $mkCol
      */
-    function createPrincipal($path, MkCol $mkCol);
-
+    public function createPrincipal($path, MkCol $mkCol);
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/PDO.php b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/PDO.php
index eb0df888b..350ecb145 100644
--- a/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/PDO.php
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalBackend/PDO.php
@@ -1,13 +1,15 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\PrincipalBackend;
 
 use Sabre\DAV;
 use Sabre\DAV\MkCol;
-use Sabre\HTTP\URLUtil;
+use Sabre\Uri;
 
 /**
- * PDO principal backend
+ * PDO principal backend.
  *
  *
  * This backend assumes all principals are in a single collection. The default collection
@@ -17,44 +19,43 @@ use Sabre\HTTP\URLUtil;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PDO extends AbstractBackend implements CreatePrincipalSupport {
-
+class PDO extends AbstractBackend implements CreatePrincipalSupport
+{
     /**
-     * PDO table name for 'principals'
+     * PDO table name for 'principals'.
      *
      * @var string
      */
     public $tableName = 'principals';
 
     /**
-     * PDO table name for 'group members'
+     * PDO table name for 'group members'.
      *
      * @var string
      */
     public $groupMembersTableName = 'groupmembers';
 
     /**
-     * pdo
+     * pdo.
      *
      * @var PDO
      */
     protected $pdo;
 
     /**
-     * A list of additional fields to support
+     * 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' => [
@@ -67,10 +68,9 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
      *
      * @param \PDO $pdo
      */
-    function __construct(\PDO $pdo) {
-
+    public function __construct(\PDO $pdo)
+    {
         $this->pdo = $pdo;
-
     }
 
     /**
@@ -87,10 +87,11 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
      *     you have an email address, use this property.
      *
      * @param string $prefixPath
+     *
      * @return array
      */
-    function getPrincipalsByPrefix($prefixPath) {
-
+    public function getPrincipalsByPrefix($prefixPath)
+    {
         $fields = [
             'uri',
         ];
@@ -98,15 +99,16 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
         foreach ($this->fieldMap as $key => $value) {
             $fields[] = $value['dbField'];
         }
-        $result = $this->pdo->query('SELECT ' . implode(',', $fields) . '  FROM ' . $this->tableName);
+        $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 !== $prefixPath) continue;
+            list($rowPrefix) = Uri\split($row['uri']);
+            if ($rowPrefix !== $prefixPath) {
+                continue;
+            }
 
             $principal = [
                 'uri' => $row['uri'],
@@ -117,11 +119,9 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
                 }
             }
             $principals[] = $principal;
-
         }
 
         return $principals;
-
     }
 
     /**
@@ -130,10 +130,11 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
      * getPrincipalsByPrefix.
      *
      * @param string $path
+     *
      * @return array
      */
-    function getPrincipalByPath($path) {
-
+    public function getPrincipalByPath($path)
+    {
         $fields = [
             'id',
             'uri',
@@ -142,14 +143,16 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
         foreach ($this->fieldMap as $key => $value) {
             $fields[] = $value['dbField'];
         }
-        $stmt = $this->pdo->prepare('SELECT ' . implode(',', $fields) . '  FROM ' . $this->tableName . ' WHERE uri = ?');
+        $stmt = $this->pdo->prepare('SELECT '.implode(',', $fields).'  FROM '.$this->tableName.' WHERE uri = ?');
         $stmt->execute([$path]);
 
         $row = $stmt->fetch(\PDO::FETCH_ASSOC);
-        if (!$row) return;
+        if (!$row) {
+            return;
+        }
 
         $principal = [
-            'id'  => $row['id'],
+            'id' => $row['id'],
             'uri' => $row['uri'],
         ];
         foreach ($this->fieldMap as $key => $value) {
@@ -157,8 +160,8 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
                 $principal[$key] = $row[$value['dbField']];
             }
         }
-        return $principal;
 
+        return $principal;
     }
 
     /**
@@ -173,41 +176,36 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
      *
      * Read the PropPatch documentation for more info and examples.
      *
-     * @param string $path
+     * @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 " . $this->tableName . " SET ";
+    public function updatePrincipal($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;
+                $query .= $dbField.' = :'.$dbField;
                 $values[$dbField] = $value;
-
             }
 
-            $query .= " WHERE uri = :uri";
+            $query .= ' WHERE uri = :uri';
             $values['uri'] = $path;
 
             $stmt = $this->pdo->prepare($query);
             $stmt->execute($values);
 
             return true;
-
         });
-
     }
 
     /**
@@ -235,48 +233,52 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
      * from working.
      *
      * @param string $prefixPath
-     * @param array $searchProperties
+     * @param array  $searchProperties
      * @param string $test
+     *
      * @return array
      */
-    function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof') {
-        if (count($searchProperties) == 0) return [];    //No criteria
+    public function searchPrincipals($prefixPath, array $searchProperties, $test = 'allof')
+    {
+        if (0 == count($searchProperties)) {
+            return [];
+        }    //No criteria
 
-        $query = 'SELECT uri FROM ' . $this->tableName . ' WHERE ';
+        $query = 'SELECT uri FROM '.$this->tableName.' WHERE ';
         $values = [];
         foreach ($searchProperties as $property => $value) {
             switch ($property) {
-                case '{DAV:}displayname' :
-                    $column = "displayname";
+                case '{DAV:}displayname':
+                    $column = 'displayname';
                     break;
-                case '{http://sabredav.org/ns}email-address' :
-                    $column = "email";
+                case '{http://sabredav.org/ns}email-address':
+                    $column = 'email';
                     break;
-                default :
+                default:
                     // Unsupported property
                     return [];
             }
-            if (count($values) > 0) $query .= (strcmp($test, "anyof") == 0 ? " OR " : " AND ");
-            $query .= 'lower(' . $column . ') LIKE lower(?)';
-            $values[] = '%' . $value . '%';
-
+            if (count($values) > 0) {
+                $query .= (0 == strcmp($test, 'anyof') ? ' 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 !== $prefixPath) continue;
+            list($rowPrefix) = Uri\split($row['uri']);
+            if ($rowPrefix !== $prefixPath) {
+                continue;
+            }
 
             $principals[] = $row['uri'];
-
         }
 
         return $principals;
-
     }
 
     /**
@@ -294,26 +296,32 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
      *
      * @param string $uri
      * @param string $principalPrefix
+     *
      * @return string
      */
-    function findByUri($uri, $principalPrefix) {
+    public function findByUri($uri, $principalPrefix)
+    {
         $value = null;
         $scheme = null;
-        list($scheme, $value) = explode(":", $uri, 2);
-        if (empty($value)) return null;
+        list($scheme, $value) = explode(':', $uri, 2);
+        if (empty($value)) {
+            return null;
+        }
 
         $uri = null;
-        switch ($scheme){
-            case "mailto":
-                $query = 'SELECT uri FROM ' . $this->tableName . ' WHERE lower(email)=lower(?)';
+        switch ($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 !== $principalPrefix) continue;
-                    
+                    list($rowPrefix) = Uri\split($row['uri']);
+                    if ($rowPrefix !== $principalPrefix) {
+                        continue;
+                    }
+
                     $uri = $row['uri'];
                     break; //Stop on first match
                 }
@@ -322,51 +330,56 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
                 //unsupported uri scheme
                 return null;
         }
+
         return $uri;
     }
 
     /**
-     * Returns the list of members for a group-principal
+     * Returns the list of members for a group-principal.
      *
      * @param string $principal
+     *
      * @return array
      */
-    function getGroupMemberSet($principal) {
-
+    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 ' . $this->tableName . ' AS principals ON groupmembers.member_id = principals.id WHERE groupmembers.principal_id = ?');
+        if (!$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;
 
+        return $result;
     }
 
     /**
-     * Returns the list of groups a principal is a member of
+     * Returns the list of groups a principal is a member of.
      *
      * @param string $principal
+     *
      * @return array
      */
-    function getGroupMembership($principal) {
-
+    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 ' . $this->tableName . ' AS principals ON groupmembers.principal_id = principals.id WHERE groupmembers.member_id = ?');
+        if (!$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;
 
+        return $result;
     }
 
     /**
@@ -375,13 +388,12 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
      * The principals should be passed as a list of uri's.
      *
      * @param string $principal
-     * @param array $members
-     * @return void
+     * @param array  $members
      */
-    function setGroupMemberSet($principal, array $members) {
-
+    public function setGroupMemberSet($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 = $this->pdo->prepare('SELECT id, uri FROM '.$this->tableName.' WHERE uri IN (? '.str_repeat(', ? ', count($members)).');');
         $stmt->execute(array_merge([$principal], $members));
 
         $memberIds = [];
@@ -394,19 +406,17 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
                 $memberIds[] = $row['id'];
             }
         }
-        if (!$principalId) throw new DAV\Exception('Principal not found');
-
+        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 = $this->pdo->prepare('DELETE FROM '.$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 = $this->pdo->prepare('INSERT INTO '.$this->groupMembersTableName.' (principal_id, member_id) VALUES (?, ?);');
             $stmt->execute([$principalId, $memberId]);
-
         }
-
     }
 
     /**
@@ -417,15 +427,12 @@ class PDO extends AbstractBackend implements CreatePrincipalSupport {
      * of the principal.
      *
      * @param string $path
-     * @param MkCol $mkCol
-     * @return void
+     * @param MkCol  $mkCol
      */
-    function createPrincipal($path, MkCol $mkCol) {
-
-        $stmt = $this->pdo->prepare('INSERT INTO ' . $this->tableName . ' (uri) VALUES (?)');
+    public function createPrincipal($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
index ee5b88a90..4fae96e0c 100644
--- a/vendor/sabre/dav/lib/DAVACL/PrincipalCollection.php
+++ b/vendor/sabre/dav/lib/DAVACL/PrincipalCollection.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL;
 
 use Sabre\DAV\Exception\InvalidResourceType;
@@ -7,7 +9,7 @@ use Sabre\DAV\IExtendedCollection;
 use Sabre\DAV\MkCol;
 
 /**
- * Principals Collection
+ * Principals Collection.
  *
  * This collection represents a list of users.
  * The users are instances of Sabre\DAVACL\Principal
@@ -16,8 +18,8 @@ use Sabre\DAV\MkCol;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PrincipalCollection extends AbstractPrincipalCollection implements IExtendedCollection, IACL {
-
+class PrincipalCollection extends AbstractPrincipalCollection implements IExtendedCollection, IACL
+{
     use ACLTrait;
 
     /**
@@ -28,12 +30,12 @@ class PrincipalCollection extends AbstractPrincipalCollection implements IExtend
      * supplied by the authentication backend.
      *
      * @param array $principal
+     *
      * @return \Sabre\DAV\INode
      */
-    function getChildForPrincipal(array $principal) {
-
+    public function getChildForPrincipal(array $principal)
+    {
         return new Principal($this->principalBackend, $principal);
-
     }
 
     /**
@@ -56,21 +58,20 @@ class PrincipalCollection extends AbstractPrincipalCollection implements IExtend
      * property for you.
      *
      * @param string $name
-     * @param MkCol $mkCol
+     * @param MkCol  $mkCol
+     *
      * @throws InvalidResourceType
-     * @return void
      */
-    function createExtendedCollection($name, MkCol $mkCol) {
-
+    public function createExtendedCollection($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,
+            $this->principalPrefix.'/'.$name,
             $mkCol
         );
-
     }
 
     /**
@@ -85,7 +86,8 @@ class PrincipalCollection extends AbstractPrincipalCollection implements IExtend
      *
      * @return array
      */
-    function getACL() {
+    public function getACL()
+    {
         return [
             [
                 'principal' => '{DAV:}authenticated',
@@ -94,5 +96,4 @@ class PrincipalCollection extends AbstractPrincipalCollection implements IExtend
             ],
         ];
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Property/Acl.php b/vendor/sabre/dav/lib/DAVACL/Xml/Property/Acl.php
index 0e1c30ccf..372f62ab3 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Property/Acl.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/Acl.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Property;
 
 use Sabre\DAV;
@@ -25,10 +27,10 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Acl implements Element, HtmlOutput {
-
+class Acl implements Element, HtmlOutput
+{
     /**
-     * List of privileges
+     * List of privileges.
      *
      * @var array
      */
@@ -43,7 +45,7 @@ class Acl implements Element, HtmlOutput {
     protected $prefixBaseUrl;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * This object requires a structure similar to the return value from
      * Sabre\DAVACL\Plugin::getACL().
@@ -57,24 +59,22 @@ class Acl implements Element, HtmlOutput {
      * will automatically be prefixed.
      *
      * @param array $privileges
-     * @param bool $prefixBaseUrl
+     * @param bool  $prefixBaseUrl
      */
-    function __construct(array $privileges, $prefixBaseUrl = true) {
-
+    public function __construct(array $privileges, $prefixBaseUrl = true)
+    {
         $this->privileges = $privileges;
         $this->prefixBaseUrl = $prefixBaseUrl;
-
     }
 
     /**
-     * Returns the list of privileges for this property
+     * Returns the list of privileges for this property.
      *
      * @return array
      */
-    function getPrivileges() {
-
+    public function getPrivileges()
+    {
         return $this->privileges;
-
     }
 
     /**
@@ -94,16 +94,12 @@ class Acl implements Element, HtmlOutput {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->privileges as $ace) {
-
             $this->serializeAce($writer, $ace);
-
         }
-
     }
 
     /**
@@ -118,32 +114,33 @@ class Acl implements Element, HtmlOutput {
      * be used to construct local links.
      *
      * @param HtmlOutputHelper $html
+     *
      * @return string
      */
-    function toHtml(HtmlOutputHelper $html) {
-
+    public function toHtml(HtmlOutputHelper $html)
+    {
         ob_start();
-        echo "<table>";
-        echo "<tr><th>Principal</th><th>Privilege</th><th></th></tr>";
+        echo '<table>';
+        echo '<tr><th>Principal</th><th>Privilege</th><th></th></tr>';
         foreach ($this->privileges as $privilege) {
-
             echo '<tr>';
             // if it starts with a {, it's a special principal
-            if ($privilege['principal'][0] === '{') {
+            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($privilege['protected'])) echo '(protected)';
+            if (!empty($privilege['protected'])) {
+                echo '(protected)';
+            }
             echo '</td>';
             echo '</tr>';
-
         }
-        echo "</table>";
-        return ob_get_clean();
+        echo '</table>';
 
+        return ob_get_clean();
     }
 
     /**
@@ -165,21 +162,21 @@ class Acl implements Element, HtmlOutput {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $elementMap = [
-            '{DAV:}ace'       => 'Sabre\Xml\Element\KeyValue',
+            '{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') {
+        foreach ((array) $reader->parseInnerTree($elementMap) as $element) {
+            if ('{DAV:}ace' !== $element['name']) {
                 continue;
             }
             $ace = $element['value'];
@@ -190,19 +187,18 @@ class Acl implements Element, HtmlOutput {
             $principal = $ace['{DAV:}principal'];
 
             switch ($principal->getType()) {
-                case Principal::HREF :
+                case Principal::HREF:
                     $principal = $principal->getHref();
                     break;
-                case Principal::AUTHENTICATED :
+                case Principal::AUTHENTICATED:
                     $principal = '{DAV:}authenticated';
                     break;
-                case Principal::UNAUTHENTICATED :
+                case Principal::UNAUTHENTICATED:
                     $principal = '{DAV:}unauthenticated';
                     break;
-                case Principal::ALL :
+                case Principal::ALL:
                     $principal = '{DAV:}all';
                     break;
-
             }
 
             $protected = array_key_exists('{DAV:}protected', $ace);
@@ -211,7 +207,7 @@ class Acl implements Element, HtmlOutput {
                 throw new DAV\Exception\NotImplemented('Every {DAV:}ace element must have a {DAV:}grant element. {DAV:}deny is not yet supported');
             }
             foreach ($ace['{DAV:}grant'] as $elem) {
-                if ($elem['name'] !== '{DAV:}privilege') {
+                if ('{DAV:}privilege' !== $elem['name']) {
                     continue;
                 }
 
@@ -222,34 +218,30 @@ class Acl implements Element, HtmlOutput {
                         'privilege' => $priv,
                     ];
                 }
-
             }
-
         }
 
         return new self($privileges);
-
     }
 
     /**
      * Serializes a single access control entry.
      *
      * @param Writer $writer
-     * @param array $ace
-     * @return void
+     * @param array  $ace
      */
-    private function serializeAce(Writer $writer, array $ace) {
-
+    private function serializeAce(Writer $writer, array $ace)
+    {
         $writer->startElement('{DAV:}ace');
 
         switch ($ace['principal']) {
-            case '{DAV:}authenticated' :
+            case '{DAV:}authenticated':
                 $principal = new Principal(Principal::AUTHENTICATED);
                 break;
-            case '{DAV:}unauthenticated' :
+            case '{DAV:}unauthenticated':
                 $principal = new Principal(Principal::UNAUTHENTICATED);
                 break;
-            case '{DAV:}all' :
+            case '{DAV:}all':
                 $principal = new Principal(Principal::ALL);
                 break;
             default:
@@ -271,7 +263,5 @@ class Acl implements Element, HtmlOutput {
         }
 
         $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
index 8d5854c23..0bf16b431 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Property/AclRestrictions.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/AclRestrictions.php
@@ -1,12 +1,14 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Property;
 
 use Sabre\Xml\Writer;
 use Sabre\Xml\XmlSerializable;
 
 /**
- * AclRestrictions property
+ * AclRestrictions property.
  *
  * This property represents {DAV:}acl-restrictions, as defined in RFC3744.
  *
@@ -14,8 +16,8 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class AclRestrictions implements XmlSerializable {
-
+class AclRestrictions implements XmlSerializable
+{
     /**
      * The xmlSerialize method is called during xml writing.
      *
@@ -33,13 +35,10 @@ class AclRestrictions implements XmlSerializable {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public 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
index 74c09cee1..083856330 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Property/CurrentUserPrivilegeSet.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/CurrentUserPrivilegeSet.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Property;
 
 use Sabre\DAV\Browser\HtmlOutput;
@@ -9,7 +11,7 @@ use Sabre\Xml\Reader;
 use Sabre\Xml\Writer;
 
 /**
- * CurrentUserPrivilegeSet
+ * CurrentUserPrivilegeSet.
  *
  * This class represents the current-user-privilege-set property. When
  * requested, it contain all the privileges a user has on a specific node.
@@ -18,26 +20,25 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class CurrentUserPrivilegeSet implements Element, HtmlOutput {
-
+class CurrentUserPrivilegeSet implements Element, HtmlOutput
+{
     /**
-     * List of privileges
+     * List of privileges.
      *
      * @var array
      */
     private $privileges;
 
     /**
-     * Creates the object
+     * Creates the object.
      *
      * Pass the privileges in clark-notation
      *
      * @param array $privileges
      */
-    function __construct(array $privileges) {
-
+    public function __construct(array $privileges)
+    {
         $this->privileges = $privileges;
-
     }
 
     /**
@@ -57,19 +58,14 @@ class CurrentUserPrivilegeSet implements Element, HtmlOutput {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         foreach ($this->privileges as $privName) {
-
             $writer->startElement('{DAV:}privilege');
             $writer->writeElement($privName);
             $writer->endElement();
-
         }
-
-
     }
 
     /**
@@ -77,12 +73,12 @@ class CurrentUserPrivilegeSet implements Element, HtmlOutput {
      * list.
      *
      * @param string $privilegeName
+     *
      * @return bool
      */
-    function has($privilegeName) {
-
+    public function has($privilegeName)
+    {
         return in_array($privilegeName, $this->privileges);
-
     }
 
     /**
@@ -90,10 +86,9 @@ class CurrentUserPrivilegeSet implements Element, HtmlOutput {
      *
      * @return array
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->privileges;
-
     }
 
     /**
@@ -115,21 +110,22 @@ class CurrentUserPrivilegeSet implements Element, HtmlOutput {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $result = [];
 
         $tree = $reader->parseInnerTree(['{DAV:}privilege' => 'Sabre\\Xml\\Element\\Elements']);
         foreach ($tree as $element) {
-            if ($element['name'] !== '{DAV:}privilege') {
+            if ('{DAV:}privilege' !== $element['name']) {
                 continue;
             }
             $result[] = $element['value'][0];
         }
-        return new self($result);
 
+        return new self($result);
     }
 
     /**
@@ -144,16 +140,14 @@ class CurrentUserPrivilegeSet implements Element, HtmlOutput {
      * be used to construct local links.
      *
      * @param HtmlOutputHelper $html
+     *
      * @return string
      */
-    function toHtml(HtmlOutputHelper $html) {
-
+    public 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
index 04d22165d..e304a2aed 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Property/Principal.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/Principal.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Property;
 
 use Sabre\DAV;
@@ -9,7 +11,7 @@ use Sabre\Xml\Reader;
 use Sabre\Xml\Writer;
 
 /**
- * Principal property
+ * Principal property.
  *
  * The principal property represents a principal from RFC3744 (ACL).
  * The property can be used to specify a principal or pseudo principals.
@@ -18,30 +20,30 @@ use Sabre\Xml\Writer;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class Principal extends DAV\Xml\Property\Href {
-
+class Principal extends DAV\Xml\Property\Href
+{
     /**
-     * To specify a not-logged-in user, use the UNAUTHENTICATED principal
+     * To specify a not-logged-in user, use the UNAUTHENTICATED principal.
      */
     const UNAUTHENTICATED = 1;
 
     /**
-     * To specify any principal that is logged in, use AUTHENTICATED
+     * To specify any principal that is logged in, use AUTHENTICATED.
      */
     const AUTHENTICATED = 2;
 
     /**
-     * Specific principals can be specified with the HREF
+     * Specific principals can be specified with the HREF.
      */
     const HREF = 3;
 
     /**
-     * Everybody, basically
+     * Everybody, basically.
      */
     const ALL = 4;
 
     /**
-     * Principal-type
+     * Principal-type.
      *
      * Must be one of the UNAUTHENTICATED, AUTHENTICATED or HREF constants.
      *
@@ -56,34 +58,31 @@ class Principal extends DAV\Xml\Property\Href {
      *
      * 'href' is only required for the HREF type.
      *
-     * @param int $type
+     * @param int         $type
      * @param string|null $href
      */
-    function __construct($type, $href = null) {
-
+    public function __construct($type, $href = null)
+    {
         $this->type = $type;
-        if ($type === self::HREF && is_null($href)) {
+        if (self::HREF === $type && is_null($href)) {
             throw new DAV\Exception('The href argument must be specified for the HREF principal type.');
         }
         if ($href) {
-            $href = rtrim($href, '/') . '/';
+            $href = rtrim($href, '/').'/';
             parent::__construct($href);
         }
-
     }
 
     /**
-     * Returns the principal type
+     * Returns the principal type.
      *
      * @return int
      */
-    function getType() {
-
+    public function getType()
+    {
         return $this->type;
-
     }
 
-
     /**
      * The xmlSerialize method is called during xml writing.
      *
@@ -101,26 +100,23 @@ class Principal extends DAV\Xml\Property\Href {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         switch ($this->type) {
-
-            case self::UNAUTHENTICATED :
+            case self::UNAUTHENTICATED:
                 $writer->writeElement('{DAV:}unauthenticated');
                 break;
-            case self::AUTHENTICATED :
+            case self::AUTHENTICATED:
                 $writer->writeElement('{DAV:}authenticated');
                 break;
-            case self::HREF :
+            case self::HREF:
                 parent::xmlSerialize($writer);
                 break;
-            case self::ALL :
+            case self::ALL:
                 $writer->writeElement('{DAV:}all');
                 break;
         }
-
     }
 
     /**
@@ -135,22 +131,21 @@ class Principal extends DAV\Xml\Property\Href {
      * be used to construct local links.
      *
      * @param HtmlOutputHelper $html
+     *
      * @return string
      */
-    function toHtml(HtmlOutputHelper $html) {
-
+    public function toHtml(HtmlOutputHelper $html)
+    {
         switch ($this->type) {
-
-            case self::UNAUTHENTICATED :
+            case self::UNAUTHENTICATED:
                 return '<em>unauthenticated</em>';
-            case self::AUTHENTICATED :
+            case self::AUTHENTICATED:
                 return '<em>authenticated</em>';
-            case self::HREF :
+            case self::HREF:
                 return parent::toHtml($html);
-            case self::ALL :
+            case self::ALL:
                 return '<em>all</em>';
         }
-
     }
 
     /**
@@ -172,25 +167,24 @@ class Principal extends DAV\Xml\Property\Href {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $tree = $reader->parseInnerTree()[0];
 
         switch ($tree['name']) {
-            case '{DAV:}unauthenticated' :
+            case '{DAV:}unauthenticated':
                 return new self(self::UNAUTHENTICATED);
-            case '{DAV:}authenticated' :
+            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: ' . $tree['name']);
+            default:
+                throw new BadRequest('Unknown or unsupported principal type: '.$tree['name']);
         }
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Property/SupportedPrivilegeSet.php b/vendor/sabre/dav/lib/DAVACL/Xml/Property/SupportedPrivilegeSet.php
index b963cc8c3..1762391d9 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Property/SupportedPrivilegeSet.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Property/SupportedPrivilegeSet.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Property;
 
 use Sabre\DAV\Browser\HtmlOutput;
@@ -8,7 +10,7 @@ use Sabre\Xml\Writer;
 use Sabre\Xml\XmlSerializable;
 
 /**
- * SupportedPrivilegeSet property
+ * 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.
@@ -21,24 +23,23 @@ use Sabre\Xml\XmlSerializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class SupportedPrivilegeSet implements XmlSerializable, HtmlOutput {
-
+class SupportedPrivilegeSet implements XmlSerializable, HtmlOutput
+{
     /**
-     * privileges
+     * privileges.
      *
      * @var array
      */
     protected $privileges;
 
     /**
-     * Constructor
+     * Constructor.
      *
      * @param array $privileges
      */
-    function __construct(array $privileges) {
-
+    public function __construct(array $privileges)
+    {
         $this->privileges = $privileges;
-
     }
 
     /**
@@ -46,10 +47,9 @@ class SupportedPrivilegeSet implements XmlSerializable, HtmlOutput {
      *
      * @return array
      */
-    function getValue() {
-
+    public function getValue()
+    {
         return $this->privileges;
-
     }
 
     /**
@@ -69,12 +69,10 @@ class SupportedPrivilegeSet implements XmlSerializable, HtmlOutput {
      * If you are opening new elements, you must also close them again.
      *
      * @param Writer $writer
-     * @return void
      */
-    function xmlSerialize(Writer $writer) {
-
+    public function xmlSerialize(Writer $writer)
+    {
         $this->serializePriv($writer, '{DAV:}all', ['aggregates' => $this->privileges]);
-
     }
 
     /**
@@ -89,52 +87,49 @@ class SupportedPrivilegeSet implements XmlSerializable, HtmlOutput {
      * be used to construct local links.
      *
      * @param HtmlOutputHelper $html
+     *
      * @return string
      */
-    function toHtml(HtmlOutputHelper $html) {
-
-        $traverse = function($privName, $priv) use (&$traverse, $html) {
-            echo "<li>";
+    public function toHtml(HtmlOutputHelper $html)
+    {
+        $traverse = function ($privName, $priv) use (&$traverse, $html) {
+            echo '<li>';
             echo $html->xmlName($privName);
             if (isset($priv['abstract']) && $priv['abstract']) {
-                echo " <i>(abstract)</i>";
+                echo ' <i>(abstract)</i>';
             }
             if (isset($priv['description'])) {
-                echo " " . $html->h($priv['description']);
+                echo ' '.$html->h($priv['description']);
             }
             if (isset($priv['aggregates'])) {
                 echo "\n<ul>\n";
                 foreach ($priv['aggregates'] as $subPrivName => $subPriv) {
                     $traverse($subPrivName, $subPriv);
                 }
-                echo "</ul>";
+                echo '</ul>';
             }
             echo "</li>\n";
         };
 
         ob_start();
-        echo "<ul class=\"tree\">";
+        echo '<ul class="tree">';
         $traverse('{DAV:}all', ['aggregates' => $this->getValue()]);
         echo "</ul>\n";
 
         return ob_get_clean();
-
     }
 
-
-
     /**
-     * Serializes a property
+     * Serializes a property.
      *
      * This is a recursive function.
      *
      * @param Writer $writer
      * @param string $privName
-     * @param array $privilege
-     * @return void
+     * @param array  $privilege
      */
-    private function serializePriv(Writer $writer, $privName, $privilege) {
-
+    private function serializePriv(Writer $writer, $privName, $privilege)
+    {
         $writer->startElement('{DAV:}supported-privilege');
 
         $writer->startElement('{DAV:}privilege');
@@ -154,7 +149,5 @@ class SupportedPrivilegeSet implements XmlSerializable, HtmlOutput {
         }
 
         $writer->endElement(); // supported-privilege
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Request/AclPrincipalPropSetReport.php b/vendor/sabre/dav/lib/DAVACL/Xml/Request/AclPrincipalPropSetReport.php
index 0aa2f29a5..17b37afab 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Request/AclPrincipalPropSetReport.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Request/AclPrincipalPropSetReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Request;
 
 use Sabre\Xml\Deserializer;
@@ -17,8 +19,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (https://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class AclPrincipalPropSetReport implements XmlDeserializable {
-
+class AclPrincipalPropSetReport implements XmlDeserializable
+{
     public $properties = [];
 
     /**
@@ -40,10 +42,11 @@ class AclPrincipalPropSetReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-       
+    public static function xmlDeserialize(Reader $reader)
+    {
         $reader->pushContext();
         $reader->elementMap['{DAV:}prop'] = 'Sabre\Xml\Deserializer\enum';
 
@@ -61,7 +64,5 @@ class AclPrincipalPropSetReport implements XmlDeserializable {
         }
 
         return $report;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Request/ExpandPropertyReport.php b/vendor/sabre/dav/lib/DAVACL/Xml/Request/ExpandPropertyReport.php
index a9938ba5b..393308cd2 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Request/ExpandPropertyReport.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Request/ExpandPropertyReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Request;
 
 use Sabre\Xml\Reader;
@@ -16,8 +18,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class ExpandPropertyReport implements XmlDeserializable {
-
+class ExpandPropertyReport implements XmlDeserializable
+{
     /**
      * An array with requested properties.
      *
@@ -51,17 +53,17 @@ class ExpandPropertyReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $elems = $reader->parseInnerTree();
 
         $obj = new self();
         $obj->properties = self::traverse($elems);
 
         return $obj;
-
     }
 
     /**
@@ -69,15 +71,15 @@ class ExpandPropertyReport implements XmlDeserializable {
      * {DAV:}property elements.
      *
      * @param array $elems
-     * @return void
+     *
+     * @return array
      */
-    private static function traverse($elems) {
-
+    private static function traverse($elems)
+    {
         $result = [];
 
         foreach ($elems as $elem) {
-
-            if ($elem['name'] !== '{DAV:}property') {
+            if ('{DAV:}property' !== $elem['name']) {
                 continue;
             }
 
@@ -85,7 +87,7 @@ class ExpandPropertyReport implements XmlDeserializable {
                 $elem['attributes']['namespace'] :
                 'DAV:';
 
-            $propName = '{' . $namespace . '}' . $elem['attributes']['name'];
+            $propName = '{'.$namespace.'}'.$elem['attributes']['name'];
 
             $value = null;
             if (is_array($elem['value'])) {
@@ -93,11 +95,8 @@ class ExpandPropertyReport implements XmlDeserializable {
             }
 
             $result[$propName] = $value;
-
         }
 
         return $result;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalMatchReport.php b/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalMatchReport.php
index 1be15ab2d..f868cc9df 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalMatchReport.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalMatchReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Request;
 
 use Sabre\Xml\Deserializer;
@@ -18,8 +20,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PrincipalMatchReport implements XmlDeserializable {
-
+class PrincipalMatchReport implements XmlDeserializable
+{
     /**
      * Report on a list of principals that match the current principal.
      */
@@ -31,7 +33,7 @@ class PrincipalMatchReport implements XmlDeserializable {
     const PRINCIPAL_PROPERTY = 2;
 
     /**
-     * Must be SELF or PRINCIPAL_PROPERTY
+     * Must be SELF or PRINCIPAL_PROPERTY.
      *
      * @var int
      */
@@ -71,10 +73,11 @@ class PrincipalMatchReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $reader->pushContext();
         $reader->elementMap['{DAV:}prop'] = 'Sabre\Xml\Deserializer\enum';
 
@@ -101,7 +104,5 @@ class PrincipalMatchReport implements XmlDeserializable {
         }
 
         return $principalMatch;
-
     }
-
 }
diff --git a/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalPropertySearchReport.php b/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalPropertySearchReport.php
index b0cf0e408..26468fd21 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalPropertySearchReport.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalPropertySearchReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Request;
 
 use Sabre\DAV\Exception\BadRequest;
@@ -18,8 +20,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PrincipalPropertySearchReport implements XmlDeserializable {
-
+class PrincipalPropertySearchReport implements XmlDeserializable
+{
     /**
      * The requested properties.
      *
@@ -28,7 +30,7 @@ class PrincipalPropertySearchReport implements XmlDeserializable {
     public $properties;
 
     /**
-     * searchProperties
+     * searchProperties.
      *
      * @var array
      */
@@ -72,31 +74,30 @@ class PrincipalPropertySearchReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         $self = new self();
 
         $foundSearchProp = false;
         $self->test = 'allof';
-        if ($reader->getAttribute('test') === 'anyof') {
+        if ('anyof' === $reader->getAttribute('test')) {
             $self->test = 'anyof';
         }
 
         $elemMap = [
             '{DAV:}property-search' => 'Sabre\\Xml\\Element\\KeyValue',
-            '{DAV:}prop'            => 'Sabre\\Xml\\Element\\KeyValue',
+            '{DAV:}prop' => 'Sabre\\Xml\\Element\\KeyValue',
         ];
-        
-        foreach ($reader->parseInnerTree($elemMap) as $elem) {
 
+        foreach ($reader->parseInnerTree($elemMap) as $elem) {
             switch ($elem['name']) {
-
-                case '{DAV:}prop' :
+                case '{DAV:}prop':
                     $self->properties = array_keys($elem['value']);
                     break;
-                case '{DAV:}property-search' :
+                case '{DAV:}property-search':
                     $foundSearchProp = true;
                     // This property has two sub-elements:
                     //   {DAV:}prop - The property to be searched on. This may
@@ -109,19 +110,15 @@ class PrincipalPropertySearchReport implements XmlDeserializable {
                         $self->searchProperties[$propName] = $elem['value']['{DAV:}match'];
                     }
                     break;
-                case '{DAV:}apply-to-principal-collection-set' :
+                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
index 64d1f7f86..37bc2cfbf 100644
--- a/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalSearchPropertySetReport.php
+++ b/vendor/sabre/dav/lib/DAVACL/Xml/Request/PrincipalSearchPropertySetReport.php
@@ -1,5 +1,7 @@
 <?php
 
+declare(strict_types=1);
+
 namespace Sabre\DAVACL\Xml\Request;
 
 use Sabre\DAV\Exception\BadRequest;
@@ -18,8 +20,8 @@ use Sabre\Xml\XmlDeserializable;
  * @author Evert Pot (http://evertpot.com/)
  * @license http://sabre.io/license/ Modified BSD License
  */
-class PrincipalSearchPropertySetReport implements XmlDeserializable {
-
+class PrincipalSearchPropertySetReport implements XmlDeserializable
+{
     /**
      * The deserialize method is called during xml parsing.
      *
@@ -39,10 +41,11 @@ class PrincipalSearchPropertySetReport implements XmlDeserializable {
      * the next element.
      *
      * @param Reader $reader
+     *
      * @return mixed
      */
-    static function xmlDeserialize(Reader $reader) {
-
+    public static function xmlDeserialize(Reader $reader)
+    {
         if (!$reader->isEmptyElement) {
             throw new BadRequest('The {DAV:}principal-search-property-set element must be empty');
         }
@@ -51,8 +54,7 @@ class PrincipalSearchPropertySetReport implements XmlDeserializable {
         $reader->next();
 
         $self = new self();
-        return $self;
 
+        return $self;
     }
-
 }