File indexing completed on 2024-05-12 06:02:06

 <?php
 
 class HTMLPurifier_URIFilter_Munge extends HTMLPurifier_URIFilter
 {
     /**
      * @type string
      */
     public $name = 'Munge';
 
     /**
      * @type bool
      */
     public $post = true;
 
     /**
      * @type string
      */
     private $target;
 
     /**
      * @type HTMLPurifier_URIParser
      */
     private $parser;
 
     /**
      * @type bool
      */
     private $doEmbed;
 
     /**
      * @type string
      */
     private $secretKey;
 
     /**
      * @type array
      */
     protected $replace = array();
 
     /**
      * @param HTMLPurifier_Config $config
      * @return bool
      */
     public function prepare($config)
     {
         $this->target = $config->get('URI.' . $this->name);
         $this->parser = new HTMLPurifier_URIParser();
         $this->doEmbed = $config->get('URI.MungeResources');
         $this->secretKey = $config->get('URI.MungeSecretKey');
         if ($this->secretKey && !function_exists('hash_hmac')) {
             throw new Exception("Cannot use %URI.MungeSecretKey without hash_hmac support.");
         }
         return true;
     }
 
     /**
      * @param HTMLPurifier_URI $uri
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      * @return bool
      */
     public function filter(&$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 (!$scheme_obj->browsable) {
             return true;
         } // ignore non-browseable schemes, since we can't munge those in a reasonable way
         if ($uri->isBenign($config, $context)) {
             return true;
         } // don't redirect if a benign URL
 
         $this->makeReplace($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;
     }
 
     /**
      * @param HTMLPurifier_URI $uri
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      */
     protected function makeReplace($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'] = hash_hmac("sha256", $string, $this->secretKey);
         }
     }
 }
 
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