ecommun / owncloud_ynh

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sources/3rdparty/sabre/dav/lib/Sabre/CalDAV/ICSExportPlugin.php 3.83 KB
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  <?php
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  namespace Sabre\CalDAV;
  
  use Sabre\DAV;
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  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.
   *
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   * @copyright Copyright (C) 2007-2014 fruux GmbH (https://fruux.com/).
   * @author Evert Pot (http://evertpot.com/)
   * @license http://sabre.io/license/ Modified BSD License
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   */
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  class ICSExportPlugin extends DAV\ServerPlugin {
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      /**
       * Reference to Server class
       *
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       * @var \Sabre\DAV\Server
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       */
      protected $server;
  
      /**
       * Initializes the plugin and registers event handlers
       *
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       * @param \Sabre\DAV\Server $server
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       * @return void
       */
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      public function initialize(DAV\Server $server) {
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          $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);
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          if (!($node instanceof Calendar)) return;
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          // Checking ACL, if available.
          if ($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(
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              '{' . Plugin::NS_CALDAV . '}calendar-data',
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          ),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) {
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          $calendar = new VObject\Component\VCalendar();
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          $calendar->version = '2.0';
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          if (DAV\Server::$exposeVersion) {
              $calendar->prodid = '-//SabreDAV//SabreDAV ' . DAV\Version::VERSION . '//EN';
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          } else {
              $calendar->prodid = '-//SabreDAV//SabreDAV//EN';
          }
          $calendar->calscale = 'GREGORIAN';
  
          $collectedTimezones = array();
  
          $timezones = array();
          $objects = array();
  
          foreach($nodes as $node) {
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              if (!isset($node[200]['{' . Plugin::NS_CALDAV . '}calendar-data'])) {
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                  continue;
              }
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              $nodeData = $node[200]['{' . Plugin::NS_CALDAV . '}calendar-data'];
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              $nodeComp = VObject\Reader::read($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();
  
      }
  
  }