CRM/Utils/ICalendar.php

   1 <?php
   2 /*
   3  +--------------------------------------------------------------------+
   4  | CiviCRM version 4.5                                                |
   5  +--------------------------------------------------------------------+
   6  | Copyright CiviCRM LLC (c) 2004-2014                                |
   7  +--------------------------------------------------------------------+
   8  | This file is a part of CiviCRM.                                    |
   9  |                                                                    |
  10  | CiviCRM is free software; you can copy, modify, and distribute it  |
  11  | under the terms of the GNU Affero General Public License           |
  12  | Version 3, 19 November 2007 and the CiviCRM Licensing Exception.   |
  13  |                                                                    |
  14  | CiviCRM is distributed in the hope that it will be useful, but     |
  15  | WITHOUT ANY WARRANTY; without even the implied warranty of         |
  16  | MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.               |
  17  | See the GNU Affero General Public License for more details.        |
  18  |                                                                    |
  19  | You should have received a copy of the GNU Affero General Public   |
  20  | License and the CiviCRM Licensing Exception along                  |
  21  | with this program; if not, contact CiviCRM LLC                     |
  22  | at info[AT]civicrm[DOT]org. If you have questions about the        |
  23  | GNU Affero General Public License or the licensing of CiviCRM,     |
  24  | see the CiviCRM license FAQ at http://civicrm.org/licensing        |
  25  +--------------------------------------------------------------------+
  26 */
  27
  28 /**
  29  *
  30  * @package CRM
  31  * @copyright CiviCRM LLC (c) 2004-2014
  32  * $Id$
  33  *
  34  */
  35
  36 /**
  37  * @file
  38  * API for event export in iCalendar format
  39  * as outlined in Internet Calendaring and
  40  * Scheduling Core Object Specification
  41  *
  42  */
  43 class CRM_Utils_ICalendar {
  44
  45   /**
  46    * Escape text elements for safe ICalendar use
  47    *
  48    * @param $text Text to escape
  49    *
  50    * @return  Escaped text
  51    *
  52    */
  53   static function formatText($text) {
  54     $text = strip_tags($text);
  55     $text = str_replace("\"", "DQUOTE", $text);
  56     $text = str_replace("\\", "\\\\", $text);
  57     $text = str_replace(",", "\,", $text);
  58     $text = str_replace(";", "\;", $text);
  59     $text = str_replace(array("\r\n", "\n", "\r"), "\\n ", $text);
  60     $text = implode("\n ", str_split($text, 50));
  61     return $text;
  62   }
  63
  64   /**
  65    * Escape date elements for safe ICalendar use
  66    *
  67    * @param $date Date to escape
  68    *
  69    * @param bool $gdata
  70    *
  71    * @return  Escaped date
  72    */
  73   static function formatDate($date, $gdata = FALSE) {
  74
  75     if ($gdata) {
  76       return date("Y-m-d\TH:i:s.000",
  77         strtotime($date)
  78       );
  79     }
  80     else {
  81       return date("Ymd\THis",
  82         strtotime($date)
  83       );
  84     }
  85   }
  86
  87   /**
  88    * Send the ICalendar to the browser with the specified content type
  89    * - 'text/calendar' : used for downloaded ics file
  90    * - 'text/plain'    : used for iCal formatted feed
  91    * - 'text/xml'      : used for gData or rss formatted feeds
  92    *
  93    * @access public
  94    *
  95    * @param string $calendar The calendar data to be published.
  96    * @param string $content_type
  97    * @param string $charset The character set to use, defaults to 'us-ascii'.
  98    * @param string $fileName The file name (for downloads)
  99    * @param string $disposition How the file should be sent ('attachment' for downloads)
 100    *
 101    * @return void
 102    */
 103   static function send($calendar, $content_type = 'text/calendar', $charset = 'us-ascii', $fileName = NULL, $disposition = NULL) {
 104     $config = CRM_Core_Config::singleton();
 105     $lang = $config->lcMessages;
 106     header("Content-Language: $lang");
 107     // header( "Content-Type: $content_type; charset=$charset; profile=\"ICalendar\"" );
 108     header("Content-Type: $content_type; charset=$charset");
 109
 110     if ($content_type == 'text/calendar') {
 111       header('Content-Length: ' . strlen($calendar));
 112       header("Content-Disposition: $disposition; filename=\"$fileName\"");
 113       header("Pragma: no-cache");
 114       header("Expires: 0");
 115       header("Cache-Control: no-cache, must-revalidate");
 116     }
 117
 118     echo $calendar;
 119   }
 120 }
 121