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

 <?php
 
 /**
  * Adds important param elements to inside of object in order to make
  * things safe.
  */
 class HTMLPurifier_Injector_SafeObject extends HTMLPurifier_Injector
 {
     /**
      * @type string
      */
     public $name = 'SafeObject';
 
     /**
      * @type array
      */
     public $needed = array('object', 'param');
 
     /**
      * @type array
      */
     protected $objectStack = array();
 
     /**
      * @type array
      */
     protected $paramStack = array();
 
     /**
      * Keep this synchronized with AttrTransform/SafeParam.php.
      * @type array
      */
     protected $addParam = array(
         'allowScriptAccess' => 'never',
         'allowNetworking' => 'internal',
     );
 
     /**
      * These are all lower-case keys.
      * @type array
      */
     protected $allowedParam = array(
         'wmode' => true,
         'movie' => true,
         'flashvars' => true,
         'src' => true,
         'allowfullscreen' => true, // if omitted, assume to be 'false'
     );
 
     /**
      * @param HTMLPurifier_Config $config
      * @param HTMLPurifier_Context $context
      * @return void
      */
     public function prepare($config, $context)
     {
         parent::prepare($config, $context);
     }
 
     /**
      * @param HTMLPurifier_Token $token
      */
     public function handleElement(&$token)
     {
         if ($token->name == 'object') {
             $this->objectStack[] = $token;
             $this->paramStack[] = array();
             $new = array($token);
             foreach ($this->addParam as $name => $value) {
                 $new[] = new HTMLPurifier_Token_Empty('param', array('name' => $name, 'value' => $value));
             }
             $token = $new;
         } elseif ($token->name == 'param') {
             $nest = count($this->currentNesting) - 1;
             if ($nest >= 0 && $this->currentNesting[$nest]->name === 'object') {
                 $i = count($this->objectStack) - 1;
                 if (!isset($token->attr['name'])) {
                     $token = false;
                     return;
                 }
                 $n = $token->attr['name'];
                 // We need this fix because YouTube doesn't supply a data
                 // attribute, which we need if a type is specified. This is
                 // *very* Flash specific.
                 if (!isset($this->objectStack[$i]->attr['data']) &&
                     ($token->attr['name'] == 'movie' || $token->attr['name'] == 'src')
                 ) {
                     $this->objectStack[$i]->attr['data'] = $token->attr['value'];
                 }
                 // Check if the parameter is the correct value but has not
                 // already been added
                 if (!isset($this->paramStack[$i][$n]) &&
                     isset($this->addParam[$n]) &&
                     $token->attr['name'] === $this->addParam[$n]) {
                     // keep token, and add to param stack
                     $this->paramStack[$i][$n] = true;
                 } elseif (isset($this->allowedParam[strtolower($n)])) {
                     // keep token, don't do anything to it
                     // (could possibly check for duplicates here)
                     // Note: In principle, parameters should be case sensitive.
                     // But it seems they are not really; so accept any case.
                 } else {
                     $token = false;
                 }
             } else {
                 // not directly inside an object, DENY!
                 $token = false;
             }
         }
     }
 
     public function handleEnd(&$token)
     {
         // This is the WRONG way of handling the object and param stacks;
         // we should be inserting them directly on the relevant object tokens
         // so that the global stack handling handles it.
         if ($token->name == 'object') {
             array_pop($this->objectStack);
             array_pop($this->paramStack);
         }
     }
 }
 
 // vim: et sw=4 sts=4