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Diffstat (limited to 'libgpl/ical/ical_sync.php')
| -rw-r--r-- | libgpl/ical/ical_sync.php | 144 |
1 files changed, 144 insertions, 0 deletions
diff --git a/libgpl/ical/ical_sync.php b/libgpl/ical/ical_sync.php new file mode 100644 index 0000000..b513574 --- /dev/null +++ b/libgpl/ical/ical_sync.php @@ -0,0 +1,144 @@ +<?php +/** + * iCalendar sync for the Calendar plugin + * + * @version @package_version@ + * @author Daniel Morlock <daniel.morlock@awesome-it.de> + * + * Copyright (C) 2013, 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; + + public $sync = 0; + + /** + * Default constructor for calendar synchronization adapter. + * + * @param int Calendar id. + * @param array Hash array with ical properties: + * url: Absolute URL to iCAL resource. + */ + public function __construct($cal_id, $props) + { + $this->ical = libcalendaring::get_ical(); + $this->cal_id = $cal_id; + + $this->url = $props["url"]; + $this->user = isset($props["user"]) ? $props["user"] : null; + $this->pass = isset($props["pass"]) ? $props["pass"] : null; + $this->sync = isset($props["sync"]) ? $props["sync"] : 0; + } + + /** + * Determines whether current calendar needs to be synced. + * + * @return True if the current calendar needs to be synced, false otherwise. + */ + public function is_synced() + { + // No change to check that so far. + return false; + } + + /** + * Fetches events from iCAL resource and returns updates. + * + * @param array List of local events. + * @return array Tuple containing the following lists: + * + * Hash list for iCAL events to be created or to be updated with the keys: + * local_event: The local event in case of an update. + * remote_event: The current event retrieved from caldav server. + * + * A list of event ids that are in sync. + */ + public function get_updates($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") . "\r\n" . + "User-Agent: PHP/" . PHP_VERSION + ) + )); + } + + $vcal = file_get_contents($this->url, false, $context); + $charset = 'UTF-8'; + foreach($http_response_header as $c => $h) + { + if(stristr($h, 'content-type') && stristr($h, 'charset')) + { + preg_match('@Content-Type:\s+([\w/+]+)(;\s+charset=(\S+))?@i', $h, $matches); + if(isset($matches[3])) + { + $charset = strtoupper(trim($matches[3])); + } + } + if(stristr($h, 'content-encoding') && stristr($h, 'gzip')) + { + $vcal = gzinflate(substr($vcal, 10, -8)); + } + } + + $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, $charset, false, false) 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); + } +} + +; +?>
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