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<?php
class HTMLPurifier_Filter_YouTube extends HTMLPurifier_Filter
{
/**
* @type string
*/
public $name = 'YouTube';
/**
* @param string $html
* @param HTMLPurifier_Config $config
* @param HTMLPurifier_Context $context
* @return string
*/
public function preFilter($html, $config, $context)
{
$pre_regex = '#<object[^>]+>.+?' .
'(?:http:)?//www.youtube.com/((?:v|cp)/[A-Za-z0-9\-_=]+).+?</object>#s';
$pre_replace = '<span class="youtube-embed">\1</span>';
return preg_replace($pre_regex, $pre_replace, $html);
}
/**
* @param string $html
* @param HTMLPurifier_Config $config
* @param HTMLPurifier_Context $context
* @return string
*/
public function postFilter($html, $config, $context)
{
$post_regex = '#<span class="youtube-embed">((?:v|cp)/[A-Za-z0-9\-_=]+)</span>#';
return preg_replace_callback($post_regex, array($this, 'postFilterCallback'), $html);
}
/**
* @param $url
* @return string
*/
protected function armorUrl($url)
{
return str_replace('--', '--', $url);
}
/**
* @param array $matches
* @return string
*/
protected function postFilterCallback($matches)
{
$url = $this->armorUrl($matches[1]);
return '<object width="425" height="350" type="application/x-shockwave-flash" ' .
'data="//www.youtube.com/' . $url . '">' .
'<param name="movie" value="//www.youtube.com/' . $url . '"></param>' .
'<!--[if IE]>' .
'<embed src="//www.youtube.com/' . $url . '"' .
'type="application/x-shockwave-flash"' .
'wmode="transparent" width="425" height="350" />' .
'<![endif]-->' .
'</object>';
}
}
// vim: et sw=4 sts=4