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 $allowedParam = array(
  21         'wmode' => true,
  22         'movie' => true,
  23         'flashvars' => true,
  24     );
  25
  26     public function prepare($config, $context) {
  27         parent::prepare($config, $context);
  28     }
  29
  30     public function handleElement(&$token) {
  31         if ($token->name == 'object') {
  32             $this->objectStack[] = $token;
  33             $this->paramStack[] = array();
  34             $new = array($token);
  35             foreach ($this->addParam as $name => $value) {
  36                 $new[] = new HTMLPurifier_Token_Empty('param', array('name' => $name, 'value' => $value));
  37             }
  38             $token = $new;
  39         } elseif ($token->name == 'param') {
  40             $nest = count($this->currentNesting) - 1;
  41             if ($nest >= 0 && $this->currentNesting[$nest]->name === 'object') {
  42                 $i = count($this->objectStack) - 1;
  43                 if (!isset($token->attr['name'])) {
  44                     $token = false;
  45                     return;
  46                 }
  47                 $n = $token->attr['name'];
  48                 // We need this fix because YouTube doesn't supply a data
  49                 // attribute, which we need if a type is specified. This is
  50                 // *very* Flash specific.
  51                 if (!isset($this->objectStack[$i]->attr['data']) && $token->attr['name'] == 'movie') {
  52                     $this->objectStack[$i]->attr['data'] = $token->attr['value'];
  53                 }
  54                 // Check if the parameter is the correct value but has not
  55                 // already been added
  56                 if (
  57                     !isset($this->paramStack[$i][$n]) &&
  58                     isset($this->addParam[$n]) &&
  59                     $token->attr['name'] === $this->addParam[$n]
  60                 ) {
  61                     // keep token, and add to param stack
  62                     $this->paramStack[$i][$n] = true;
  63                 } elseif (isset($this->allowedParam[$n])) {
  64                     // keep token, don't do anything to it
  65                     // (could possibly check for duplicates here)
  66                 } else {
  67                     $token = false;
  68                 }
  69             } else {
  70                 // not directly inside an object, DENY!
  71                 $token = false;
  72             }
  73         }
  74     }
  75
  76     public function handleEnd(&$token) {
  77         // This is the WRONG way of handling the object and param stacks;
  78         // we should be inserting them directly on the relevant object tokens
  79         // so that the global stack handling handles it.
  80         if ($token->name == 'object') {
  81             array_pop($this->objectStack);
  82             array_pop($this->paramStack);
  83         }
  84     }
  85
  86 }
  87
  88 // vim: et sw=4 sts=4