library/HTMLPurifier/Filter/YouTube.php

   1 <?php
   2
   3 class HTMLPurifier_Filter_YouTube extends HTMLPurifier_Filter
   4 {
   5
   6     /**
   7      * @type string
   8      */
   9     public $name = 'YouTube';
  10
  11     /**
  12      * @param string $html
  13      * @param HTMLPurifier_Config $config
  14      * @param HTMLPurifier_Context $context
  15      * @return string
  16      */
  17     public function preFilter($html, $config, $context)
  18     {
  19         $pre_regex = '#<object[^>]+>.+?' .
  20             '(?:http:)?//www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+).+?</object>#s';
  21         $pre_replace = '<span class="youtube-embed">\1</span>';
  22         return preg_replace($pre_regex, $pre_replace, $html);
  23     }
  24
  25     /**
  26      * @param string $html
  27      * @param HTMLPurifier_Config $config
  28      * @param HTMLPurifier_Context $context
  29      * @return string
  30      */
  31     public function postFilter($html, $config, $context)
  32     {
  33         $post_regex = '#<span class="youtube-embed">((?:v|cp)/[A-Za-z0-9\-_=]+)</span>#';
  34         return preg_replace_callback($post_regex, array($this, 'postFilterCallback'), $html);
  35     }
  36
  37     /**
  38      * @param $url
  39      * @return string
  40      */
  41     protected function armorUrl($url)
  42     {
  43         return str_replace('--', '-&#45;', $url);
  44     }
  45
  46     /**
  47      * @param array $matches
  48      * @return string
  49      */
  50     protected function postFilterCallback($matches)
  51     {
  52         $url = $this->armorUrl($matches[1]);
  53         return '<object width="425" height="350" type="application/x-shockwave-flash" ' .
  54         'data="//www.youtube.com/' . $url . '">' .
  55         '<param name="movie" value="//www.youtube.com/' . $url . '"></param>' .
  56         '<!--[if IE]>' .
  57         '<embed src="//www.youtube.com/' . $url . '"' .
  58         'type="application/x-shockwave-flash"' .
  59         'wmode="transparent" width="425" height="350" />' .
  60         '<![endif]-->' .
  61         '</object>';
  62     }
  63 }
  64
  65 // vim: et sw=4 sts=4