Heavily refactored, including multiple calendars per user and recurring events. Not in an installable state yet, though

dav/SabreDAV/lib/Sabre/CalDAV/Notifications/Collection.php

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+<?php
+
+/**
+ * This node represents a list of notifications.
+ *
+ * It provides no additional functionality, but you must implement this
+ * interface to allow the Notifications plugin to mark the collection
+ * as a notifications collection.
+ *
+ * This collection should only return Sabre_CalDAV_Notifications_INode nodes as
+ * its children.
+ *
+ * @package Sabre
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Notifications_Collection extends Sabre_DAV_Collection implements Sabre_CalDAV_Notifications_ICollection {
+
+    /**
+     * The notification backend
+     *
+     * @var Sabre_CalDAV_Backend_NotificationSupport
+     */
+    protected $caldavBackend;
+
+    /**
+     * Principal uri
+     *
+     * @var string
+     */
+    protected $principalUri;
+
+    /**
+     * Constructor
+     *
+     * @param Sabre_CalDAV_Backend_NotificationSupport $caldavBackend
+     * @param string $principalUri
+     */
+    public function __construct(Sabre_CalDAV_Backend_NotificationSupport $caldavBackend, $principalUri) {
+
+        $this->caldavBackend = $caldavBackend;
+        $this->principalUri = $principalUri;
+
+    }
+
+    /**
+     * Returns all notifications for a principal
+     *
+     * @return array
+     */
+    public function getChildren() {
+
+        $children = array();
+        $notifications = $this->caldavBackend->getNotificationsForPrincipal($this->principalUri);
+
+        foreach($notifications as $notification) {
+
+            $children[] = new Sabre_CalDAV_Notifications_Node(
+                $this->caldavBackend,
+                $notification
+            );
+        }
+
+        return $children;
+
+    }
+
+    /**
+     * Returns the name of this object
+     *
+     * @return string
+     */
+    public function getName() {
+
+        return 'notifications';
+
+    }
+
+}

dav/SabreDAV/lib/Sabre/CalDAV/Notifications/ICollection.php

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+<?php
+
+/**
+ * This node represents a list of notifications.
+ *
+ * It provides no additional functionality, but you must implement this
+ * interface to allow the Notifications plugin to mark the collection
+ * as a notifications collection.
+ *
+ * This collection should only return Sabre_CalDAV_Notifications_INode nodes as
+ * its children.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_Notifications_ICollection extends Sabre_DAV_ICollection {
+
+
+}

dav/SabreDAV/lib/Sabre/CalDAV/Notifications/INode.php

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+<?php
+
+/**
+ * This node represents a single notification.
+ *
+ * The signature is mostly identical to that of Sabre_DAV_IFile, but the get() method 
+ * MUST return an xml document that matches the requirements of the 
+ * 'caldav-notifications.txt' spec.
+ *
+ * For a complete example, check out the Notification class, which contains 
+ * some helper functions.
+ * 
+ * @package Sabre
+ * @subpackage CalDAV 
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_Notifications_INode {
+
+    /**
+     * This method must return an xml element, using the 
+     * Sabre_CalDAV_Notifications_INotificationType classes.
+     * 
+     * @return Sabre_DAVNotification_INotificationType
+     */
+    function getNotificationType();
+
+}

dav/SabreDAV/lib/Sabre/CalDAV/Notifications/INotificationType.php

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+<?php
+
+/**
+ * This interface reflects a single notification type.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+interface Sabre_CalDAV_Notifications_INotificationType extends Sabre_DAV_PropertyInterface {
+
+    /**
+     * Serializes the notification as a single property.
+     *
+     * You should usually just encode the single top-level element of the
+     * notification.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    function serialize(Sabre_DAV_Server $server, \DOMElement $node);
+
+    /**
+     * This method serializes the entire notification, as it is used in the
+     * response body.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    function serializeBody(Sabre_DAV_Server $server, \DOMElement $node);
+
+    /**
+     * 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();
+
+}

dav/SabreDAV/lib/Sabre/CalDAV/Notifications/Node.php

@@ -0,0 +1,68 @@
+<?php
+
+/**
+ * This node represents a single notification.
+ *
+ * The signature is mostly identical to that of Sabre_DAV_IFile, but the get() method 
+ * MUST return an xml document that matches the requirements of the 
+ * 'caldav-notifications.txt' spec.
+
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/) 
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Notifications_Node extends Sabre_DAV_Node implements Sabre_CalDAV_Notifications_INode {
+
+    /**
+     * The notification backend
+     * 
+     * @var Sabre_CalDAV_Backend_NotificationSupport
+     */
+    protected $caldavBackend;
+
+    /**
+     * The actual notification
+     * 
+     * @var Sabre_CalDAV_Notifications_INotificationType 
+     */
+    protected $notification;
+        
+    /**
+     * Constructor
+     *
+     * @param Sabre_CalDAV_Backend_NotificationSupport $caldavBackend
+     * @param Sabre_CalDAV_Notifications_INotificationType $notification
+     */
+    public function __construct(Sabre_CalDAV_Backend_NotificationSupport $caldavBackend, Sabre_CalDAV_Notifications_INotificationType $notification) {        
+
+        $this->caldavBackend = $caldavBackend;
+        $this->notification = $notification;
+
+    }
+
+    /**
+     * Returns the path name for this notification
+     * 
+     * @return id 
+     */
+    public function getName() {
+
+        return $this->notification->getId();
+
+    }
+
+    /**
+     * This method must return an xml element, using the 
+     * Sabre_CalDAV_Notifications_INotificationType classes.
+     * 
+     * @return Sabre_DAVNotification_INotificationType
+     */
+    public function getNotificationType() {
+
+        return $this->notification;
+
+    }
+
+}

dav/SabreDAV/lib/Sabre/CalDAV/Notifications/Notification/SystemStatus.php

@@ -0,0 +1,158 @@
+<?php
+
+/**
+ * SystemStatus notification
+ *
+ * This notification can be used to indicate to the user that the system is
+ * down.
+ *
+ * @package Sabre
+ * @subpackage CalDAV
+ * @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
+ * @author Evert Pot (http://www.rooftopsolutions.nl/)
+ * @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
+ */
+class Sabre_CalDAV_Notifications_Notification_SystemStatus extends Sabre_DAV_Property implements Sabre_CalDAV_Notifications_INotificationType {
+
+    const TYPE_LOW = 1;
+    const TYPE_MEDIUM = 2;
+    const TYPE_HIGH = 3;
+
+    /**
+     * A unique id
+     *
+     * @var string
+     */
+    protected $id;
+
+    /**
+     * The type of alert. This should be one of the TYPE_ constants.
+     *
+     * @var int
+     */
+    protected $type;
+
+    /**
+     * A human-readable description of the problem.
+     *
+     * @var string
+     */
+    protected $description;
+
+    /**
+     * A url to a website with more information for the user.
+     *
+     * @var string
+     */
+    protected $href;
+
+    /**
+     * Creates the notification.
+     *
+     * Some kind of unique id should be provided. This is used to generate a
+     * url.
+     *
+     * @param string $id
+     * @param int $type
+     * @param string $description
+     * @param string $href
+     */
+    public function __construct($id, $type = self::TYPE_HIGH, $description = null, $href = null) {
+
+        $this->id = $id;
+        $this->type = $type;
+        $this->description = $description;
+        $this->href = $href;
+
+    }
+
+    /**
+     * Serializes the notification as a single property.
+     *
+     * You should usually just encode the single top-level element of the
+     * notification.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serialize(Sabre_DAV_Server $server, \DOMElement $node) {
+
+        switch($this->type) {
+            case self::TYPE_LOW :
+                $type = 'low';
+                break;
+            case self::TYPE_MEDIUM :
+                $type = 'medium';
+                break;
+            default :
+            case self::TYPE_HIGH :
+                $type = 'high';
+                break;
+        }
+
+        $prop = $node->ownerDocument->createElement('cs:systemstatus');
+        $prop->setAttribute('type', $type);
+
+        $node->appendChild($prop);
+
+    }
+
+    /**
+     * This method serializes the entire notification, as it is used in the
+     * response body.
+     *
+     * @param Sabre_DAV_Server $server
+     * @param DOMElement $node
+     * @return void
+     */
+    public function serializeBody(Sabre_DAV_Server $server, \DOMElement $node) {
+
+        switch($this->type) {
+            case self::TYPE_LOW :
+                $type = 'low';
+                break;
+            case self::TYPE_MEDIUM :
+                $type = 'medium';
+                break;
+            default :
+            case self::TYPE_HIGH :
+                $type = 'high';
+                break;
+        }
+
+        $prop = $node->ownerDocument->createElement('cs:systemstatus');
+        $prop->setAttribute('type', $type);
+
+        if ($this->description) {
+            $text = $node->ownerDocument->createTextNode($this->description);
+            $desc = $node->ownerDocument->createElement('cs:description');
+            $desc->appendChild($text);
+            $prop->appendChild($desc);
+        }
+        if ($this->href) {
+            $text = $node->ownerDocument->createTextNode($this->href);
+            $href = $node->ownerDocument->createElement('d:href');
+            $href->appendChild($text);
+            $prop->appendChild($href);
+        }
+
+        $node->appendChild($prop);
+
+    }
+
+    /**
+     * Returns a unique id for this notification
+     *
+     * This is just the base url. This should generally be some kind of unique
+     * id.
+     *
+     * @return string
+     */
+    public function getId() {
+
+        return $this->id;
+
+    }
+
+}