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<?php
class HTMLPurifier_URIFilter_Munge extends HTMLPurifier_URIFilter
{
public $name = 'Munge';
public $post = true;
private $target, $parser, $doEmbed, $secretKey;
protected $replace = array();
public function prepare($config) {
$this->target = $config->get('URI.' . $this->name);
$this->parser = new HTMLPurifier_URIParser();
$this->doEmbed = $config->get('URI.MungeResources');
$this->secretKey = $config->get('URI.MungeSecretKey');
return true;
}
public function filter(&$uri, $config, $context) {
if ($context->get('EmbeddedURI', true) && !$this->doEmbed) return true;
$scheme_obj = $uri->getSchemeObj($config, $context);
if (!$scheme_obj) return true; // ignore unknown schemes, maybe another postfilter did it
if (is_null($uri->host) || empty($scheme_obj->browsable)) {
return true;
}
// don't redirect if target host is our host
if ($uri->host === $config->getDefinition('URI')->host) {
return true;
}
$this->makeReplace($uri, $config, $context);
$this->replace = array_map('rawurlencode', $this->replace);
$new_uri = strtr($this->target, $this->replace);
$new_uri = $this->parser->parse($new_uri);
// don't redirect if the target host is the same as the
// starting host
if ($uri->host === $new_uri->host) return true;
$uri = $new_uri; // overwrite
return true;
}
protected function makeReplace($uri, $config, $context) {
$string = $uri->toString();
// always available
$this->replace['%s'] = $string;
$this->replace['%r'] = $context->get('EmbeddedURI', true);
$token = $context->get('CurrentToken', true);
$this->replace['%n'] = $token ? $token->name : null;
$this->replace['%m'] = $context->get('CurrentAttr', true);
$this->replace['%p'] = $context->get('CurrentCSSProperty', true);
// not always available
if ($this->secretKey) $this->replace['%t'] = sha1($this->secretKey . ':' . $string);
}
}
// vim: et sw=4 sts=4
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