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<?php
use Sabre\VObject;
/**
* 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
* support ics files.
*
* @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_ICSExportPlugin extends Sabre_DAV_ServerPlugin {
/**
* Reference to Server class
*
* @var Sabre_DAV_Server
*/
private $server;
/**
* Initializes the plugin and registers event handlers
*
* @param Sabre_DAV_Server $server
* @return void
*/
public function initialize(Sabre_DAV_Server $server) {
$this->server = $server;
$this->server->subscribeEvent('beforeMethod',array($this,'beforeMethod'), 90);
}
/**
* 'beforeMethod' event handles. This event handles intercepts GET requests ending
* with ?export
*
* @param string $method
* @param string $uri
* @return bool
*/
public function beforeMethod($method, $uri) {
if ($method!='GET') return;
if ($this->server->httpRequest->getQueryString()!='export') return;
// splitting uri
list($uri) = explode('?',$uri,2);
$node = $this->server->tree->getNodeForPath($uri);
if (!($node instanceof Sabre_CalDAV_Calendar)) return;
// Checking ACL, if available.
if ($aclPlugin = $this->server->getPlugin('acl')) {
$aclPlugin->checkPrivileges($uri, '{DAV:}read');
}
$this->server->httpResponse->setHeader('Content-Type','text/calendar');
$this->server->httpResponse->sendStatus(200);
$nodes = $this->server->getPropertiesForPath($uri, array(
'{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}calendar-data',
),1);
$this->server->httpResponse->sendBody($this->generateICS($nodes));
// Returning false to break the event chain
return false;
}
/**
* Merges all calendar objects, and builds one big ics export
*
* @param array $nodes
* @return string
*/
public function generateICS(array $nodes) {
$calendar = new VObject\Component('vcalendar');
$calendar->version = '2.0';
if (Sabre_DAV_Server::$exposeVersion) {
$calendar->prodid = '-//SabreDAV//SabreDAV ' . Sabre_DAV_Version::VERSION . '//EN';
} else {
$calendar->prodid = '-//SabreDAV//SabreDAV//EN';
}
$calendar->calscale = 'GREGORIAN';
$collectedTimezones = array();
$timezones = array();
$objects = array();
foreach($nodes as $node) {
if (!isset($node[200]['{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}calendar-data'])) {
continue;
}
$nodeData = $node[200]['{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}calendar-data'];
$nodeComp = VObject\Reader::read($nodeData);
foreach($nodeComp->children() as $child) {
switch($child->name) {
case 'VEVENT' :
case 'VTODO' :
case 'VJOURNAL' :
$objects[] = $child;
break;
// VTIMEZONE is special, because we need to filter out the duplicates
case 'VTIMEZONE' :
// Naively just checking tzid.
if (in_array((string)$child->TZID, $collectedTimezones)) continue;
$timezones[] = $child;
$collectedTimezones[] = $child->TZID;
break;
}
}
}
foreach($timezones as $tz) $calendar->add($tz);
foreach($objects as $obj) $calendar->add($obj);
return $calendar->serialize();
}
}
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