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-rw-r--r--calendar/drivers/ical/ical_sync.php125
1 files changed, 125 insertions, 0 deletions
diff --git a/calendar/drivers/ical/ical_sync.php b/calendar/drivers/ical/ical_sync.php
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+<?php
+/**
+ * iCalendar sync for the Calendar plugin
+ *
+ * @version @package_version@
+ * @author Daniel Morlock <daniel.morlock@awesome-it.de>
+ *
+ * Copyright (C) Awesome IT GbR <info@awesome-it.de>
+ *
+ * This program is free software: you can redistribute it and/or modify
+ * it under the terms of the GNU Affero General Public License as
+ * published by the Free Software Foundation, either version 3 of the
+ * License, or (at your option) any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU Affero General Public License for more details.
+ *
+ * You should have received a copy of the GNU Affero General Public License
+ * along with this program. If not, see <http://www.gnu.org/licenses/>.
+ */
+
+class ical_sync
+{
+ const ACTION_NONE = 1;
+ const ACTION_UPDATE = 2;
+ const ACTION_CREATE = 4;
+
+ private $cal_id = null;
+ private $url = null;
+ private $user = null;
+ private $pass = null;
+ private $ical = null;
+
+ /**
+ * Default constructor for calendar synchronization adapter.
+ *
+ * @param int Calendar id.
+ * @param array Hash array with ical properties:
+ * url: Absolute URL to iCAL resource.
+ */
+ public function __construct($cal_id, $props)
+ {
+ $this->ical = libcalendaring::get_ical();
+ $this->cal_id = $cal_id;
+
+ $this->url = $props["ical_url"];
+ $this->user = isset($props["ical_user"]) ? $props["ical_user"] : null;
+ $this->pass = isset($props["ical_pass"]) ? $props["ical_pass"] : null;
+ }
+
+ /**
+ * Determines whether current calendar needs to be synced.
+ *
+ * @return True if the current calendar needs to be synced, false otherwise.
+ */
+ public function is_synced()
+ {
+ // No change to check that so far.
+ return false;
+ }
+
+ /**
+ * Fetches events from iCAL resource and returns updates.
+ *
+ * @param array List of local events.
+ * @return array Tuple containing the following lists:
+ *
+ * Hash list for iCAL events to be created or to be updated with the keys:
+ * local_event: The local event in case of an update.
+ * remote_event: The current event retrieved from caldav server.
+ *
+ * A list of event ids that are in sync.
+ */
+ public function get_updates($events)
+ {
+ $context = null;
+ if($this->user != null && $this->pass != null)
+ {
+ $context = stream_context_create(array(
+ 'http' => array(
+ 'header' => "Authorization: Basic " . base64_encode("$this->user:$this->pass")
+ )
+ ));
+ }
+
+ $vcal = file_get_contents($this->url, false, $context);
+ $updates = array();
+ $synced = array();
+ if($vcal !== false) {
+
+ // Hash existing events by uid.
+ $events_hash = array();
+ foreach($events as $event) {
+ $events_hash[$event['uid']] = $event;
+ }
+
+ foreach ($this->ical->import($vcal) as $remote_event) {
+
+ // Attach remote event to current calendar
+ $remote_event["calendar"] = $this->cal_id;
+
+ $local_event = null;
+ if($events_hash[$remote_event['uid']])
+ $local_event = $events_hash[$remote_event['uid']];
+
+ // Determine whether event don't need an update.
+ if($local_event && $local_event["changed"] >= $remote_event["changed"])
+ {
+ array_push($synced, $local_event["id"]);
+ }
+ else
+ {
+ array_push($updates, array('local_event' => $local_event, 'remote_event' => $remote_event));
+ }
+ }
+ }
+
+ return array($updates, $synced);
+ }
+}
+
+;
+?> \ No newline at end of file

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