lib/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php

   1 <?php
   2
   3 /**
   4  * Adds important param elements to inside of object in order to make
   5  * things safe.
   6  */
   7 class HTMLPurifier_Injector_SafeObject extends HTMLPurifier_Injector
   8 {
   9     public $name = 'SafeObject';
  10     public $needed = array('object', 'param');
  11
  12     protected $objectStack = array();
  13     protected $paramStack  = array();
  14
  15     // Keep this synchronized with AttrTransform/SafeParam.php
  16     protected $addParam = array(
  17         'allowScriptAccess' => 'never',
  18         'allowNetworking' => 'internal',
  19     );
  20     protected $allowedParam = array(
  21         'wmode' => true,
  22         'movie' => true,
  23     );
  24
  25     public function prepare($config, $context) {
  26         parent::prepare($config, $context);
  27     }
  28
  29     public function handleElement(&$token) {
  30         if ($token->name == 'object') {
  31             $this->objectStack[] = $token;
  32             $this->paramStack[] = array();
  33             $new = array($token);
  34             foreach ($this->addParam as $name => $value) {
  35                 $new[] = new HTMLPurifier_Token_Empty('param', array('name' => $name, 'value' => $value));
  36             }
  37             $token = $new;
  38         } elseif ($token->name == 'param') {
  39             $nest = count($this->currentNesting) - 1;
  40             if ($nest >= 0 && $this->currentNesting[$nest]->name === 'object') {
  41                 $i = count($this->objectStack) - 1;
  42                 if (!isset($token->attr['name'])) {
  43                     $token = false;
  44                     return;
  45                 }
  46                 $n = $token->attr['name'];
  47                 // We need this fix because YouTube doesn't supply a data
  48                 // attribute, which we need if a type is specified. This is
  49                 // *very* Flash specific.
  50                 if (!isset($this->objectStack[$i]->attr['data']) && $token->attr['name'] == 'movie') {
  51                     $this->objectStack[$i]->attr['data'] = $token->attr['value'];
  52                 }
  53                 // Check if the parameter is the correct value but has not
  54                 // already been added
  55                 if (
  56                     !isset($this->paramStack[$i][$n]) &&
  57                     isset($this->addParam[$n]) &&
  58                     $token->attr['name'] === $this->addParam[$n]
  59                 ) {
  60                     // keep token, and add to param stack
  61                     $this->paramStack[$i][$n] = true;
  62                 } elseif (isset($this->allowedParam[$n])) {
  63                     // keep token, don't do anything to it
  64                     // (could possibly check for duplicates here)
  65                 } else {
  66                     $token = false;
  67                 }
  68             } else {
  69                 // not directly inside an object, DENY!
  70                 $token = false;
  71             }
  72         }
  73     }
  74
  75     public function handleEnd(&$token) {
  76         // This is the WRONG way of handling the object and param stacks;
  77         // we should be inserting them directly on the relevant object tokens
  78         // so that the global stack handling handles it.
  79         if ($token->name == 'object') {
  80             array_pop($this->objectStack);
  81             array_pop($this->paramStack);
  82         }
  83     }
  84
  85 }
  86
  87 // vim: et sw=4 sts=4