]> git.wh0rd.org Git - tt-rss.git/blob - lib/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php
update HTMLPurifier; enable embedded flash video in articles
[tt-rss.git] / 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 $allowedParam = array(
21         'wmode' => true,
22         'movie' => true,
23         'flashvars' => true,
24         'src' => true,
25         'allowFullScreen' => true, // if omitted, assume to be 'false'
26     );
27
28     public function prepare($config, $context) {
29         parent::prepare($config, $context);
30     }
31
32     public function handleElement(&$token) {
33         if ($token->name == 'object') {
34             $this->objectStack[] = $token;
35             $this->paramStack[] = array();
36             $new = array($token);
37             foreach ($this->addParam as $name => $value) {
38                 $new[] = new HTMLPurifier_Token_Empty('param', array('name' => $name, 'value' => $value));
39             }
40             $token = $new;
41         } elseif ($token->name == 'param') {
42             $nest = count($this->currentNesting) - 1;
43             if ($nest >= 0 && $this->currentNesting[$nest]->name === 'object') {
44                 $i = count($this->objectStack) - 1;
45                 if (!isset($token->attr['name'])) {
46                     $token = false;
47                     return;
48                 }
49                 $n = $token->attr['name'];
50                 // We need this fix because YouTube doesn't supply a data
51                 // attribute, which we need if a type is specified. This is
52                 // *very* Flash specific.
53                 if (!isset($this->objectStack[$i]->attr['data']) &&
54                     ($token->attr['name'] == 'movie' || $token->attr['name'] == 'src')) {
55                     $this->objectStack[$i]->attr['data'] = $token->attr['value'];
56                 }
57                 // Check if the parameter is the correct value but has not
58                 // already been added
59                 if (
60                     !isset($this->paramStack[$i][$n]) &&
61                     isset($this->addParam[$n]) &&
62                     $token->attr['name'] === $this->addParam[$n]
63                 ) {
64                     // keep token, and add to param stack
65                     $this->paramStack[$i][$n] = true;
66                 } elseif (isset($this->allowedParam[$n])) {
67                     // keep token, don't do anything to it
68                     // (could possibly check for duplicates here)
69                 } else {
70                     $token = false;
71                 }
72             } else {
73                 // not directly inside an object, DENY!
74                 $token = false;
75             }
76         }
77     }
78
79     public function handleEnd(&$token) {
80         // This is the WRONG way of handling the object and param stacks;
81         // we should be inserting them directly on the relevant object tokens
82         // so that the global stack handling handles it.
83         if ($token->name == 'object') {
84             array_pop($this->objectStack);
85             array_pop($this->paramStack);
86         }
87     }
88
89 }
90
91 // vim: et sw=4 sts=4