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|cp)/[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: $post_regex = '#<span class="youtube-embed">((?:v|cp)/[A-Za-z0-9\-_=]+)</span>#';
17: return preg_replace_callback($post_regex, array($this, 'postFilterCallback'), $html);
18: }
19:
20: protected function armorUrl($url) {
21: return str_replace('--', '--', $url);
22: }
23:
24: protected function postFilterCallback($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/'.$url.'">'.
28: '<param name="movie" value="http://www.youtube.com/'.$url.'"></param>'.
29: '<!--[if IE]>'.
30: '<embed src="http://www.youtube.com/'.$url.'"'.
31: 'type="application/x-shockwave-flash"'.
32: 'wmode="transparent" width="425" height="350" />'.
33: '<![endif]-->'.
34: '</object>';
35:
36: }
37: }
38:
39:
40: