library/HTMLPurifier/Filter/YouTube.php

   1 <?php
   2
   3 class HTMLPurifier_Filter_YouTube extends HTMLPurifier_Filter
   4 {
   5
   6     public $name = 'YouTube';
   7
   8     public function preFilter($html, $config, $context) {
   9         $pre_regex = '#<object[^>]+>.+?'.
  10             'http://www.youtube.com/v/([A-Za-z0-9\-_]+).+?</object>#s';
  11         $pre_replace = '<span class="youtube-embed">\1</span>';
  12         return preg_replace($pre_regex, $pre_replace, $html);
  13     }
  14
  15     public function postFilter($html, $config, $context) {
  16         $post_regex = '#<span class="youtube-embed">([A-Za-z0-9\-_]+)</span>#';
  17         return preg_replace_callback($post_regex, array($this, 'postFilterCallback'), $html);
  18     }
  19
  20     protected function armorUrl($url) {
  21         return str_replace('--', '-&#45;', $url);
  22     }
  23
  24     protected function postFilterCallback($matches) {
  25         $url = $this->armorUrl($matches[1]);
  26         return '<object width="425" height="350" type="application/x-shockwave-flash" '.
  27             'data="http://www.youtube.com/v/'.$url.'">'.
  28             '<param name="movie" value="http://www.youtube.com/v/'.$url.'"></param>'.
  29             '<!--[if IE]>'.
  30             '<embed src="http://www.youtube.com/v/'.$url.'"'.
  31             'type="application/x-shockwave-flash"'.
  32             'wmode="transparent" width="425" height="350" />'.
  33             '<![endif]-->'.
  34             '</object>';
  35
  36     }
  37 }
  38
  39 // vim: et sw=4 sts=4