another bulk of composer updates

(cherry picked from commit 6685381fd8db507493c3d7c1793f8c05c681bbce)

66 files changed, 2202 insertions, 2570 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);
-
     }
-
 }