142 lines
3.9 KiB
PHP
142 lines
3.9 KiB
PHP
<?php
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use Sabre\VObject;
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/**
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* ICS Exporter
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*
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* This addon adds the ability to export entire calendars as .ics files.
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* This is useful for clients that don't support CalDAV yet. They often do
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* support ics files.
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*
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* @package Sabre
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* @subpackage CalDAV
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* @copyright Copyright (C) 2007-2012 Rooftop Solutions. All rights reserved.
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* @author Evert Pot (http://www.rooftopsolutions.nl/)
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* @license http://code.google.com/p/sabredav/wiki/License Modified BSD License
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*/
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class Sabre_CalDAV_ICSExportPlugin extends Sabre_DAV_ServerPlugin {
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/**
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* Reference to Server class
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*
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* @var Sabre_DAV_Server
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*/
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private $server;
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/**
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* Initializes the addon and registers event handlers
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*
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* @param Sabre_DAV_Server $server
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* @return void
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*/
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public function initialize(Sabre_DAV_Server $server) {
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$this->server = $server;
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$this->server->subscribeEvent('beforeMethod',array($this,'beforeMethod'), 90);
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}
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/**
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* 'beforeMethod' event handles. This event handles intercepts GET requests ending
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* with ?export
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*
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* @param string $method
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* @param string $uri
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* @return bool
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*/
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public function beforeMethod($method, $uri) {
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if ($method!='GET') return;
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if ($this->server->httpRequest->getQueryString()!='export') return;
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// splitting uri
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list($uri) = explode('?',$uri,2);
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$node = $this->server->tree->getNodeForPath($uri);
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if (!($node instanceof Sabre_CalDAV_Calendar)) return;
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// Checking ACL, if available.
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if ($aclPlugin = $this->server->getPlugin('acl')) {
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$aclPlugin->checkPrivileges($uri, '{DAV:}read');
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}
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$this->server->httpResponse->setHeader('Content-Type','text/calendar');
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$this->server->httpResponse->sendStatus(200);
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$nodes = $this->server->getPropertiesForPath($uri, array(
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'{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}calendar-data',
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),1);
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$this->server->httpResponse->sendBody($this->generateICS($nodes));
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// Returning false to break the event chain
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return false;
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}
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/**
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* Merges all calendar objects, and builds one big ics export
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*
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* @param array $nodes
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* @return string
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*/
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public function generateICS(array $nodes) {
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$calendar = new VObject\Component('vcalendar');
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$calendar->version = '2.0';
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if (Sabre_DAV_Server::$exposeVersion) {
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$calendar->prodid = '-//SabreDAV//SabreDAV ' . Sabre_DAV_Version::VERSION . '//EN';
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} else {
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$calendar->prodid = '-//SabreDAV//SabreDAV//EN';
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}
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$calendar->calscale = 'GREGORIAN';
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$collectedTimezones = array();
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$timezones = array();
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$objects = array();
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foreach($nodes as $node) {
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if (!isset($node[200]['{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}calendar-data'])) {
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continue;
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}
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$nodeData = $node[200]['{' . Sabre_CalDAV_Plugin::NS_CALDAV . '}calendar-data'];
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$nodeComp = VObject\Reader::read($nodeData);
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foreach($nodeComp->children() as $child) {
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switch($child->name) {
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case 'VEVENT' :
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case 'VTODO' :
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case 'VJOURNAL' :
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$objects[] = $child;
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break;
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// VTIMEZONE is special, because we need to filter out the duplicates
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case 'VTIMEZONE' :
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// Naively just checking tzid.
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if (in_array((string)$child->TZID, $collectedTimezones)) continue;
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$timezones[] = $child;
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$collectedTimezones[] = $child->TZID;
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break;
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}
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}
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}
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foreach($timezones as $tz) $calendar->add($tz);
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foreach($objects as $obj) $calendar->add($obj);
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return $calendar->serialize();
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}
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}
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