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authorMike Macgirvin <mike@macgirvin.com>2010-09-08 20:14:17 -0700
committerMike Macgirvin <mike@macgirvin.com>2010-09-08 20:14:17 -0700
commitffb1997902facb36b78a7cfa522f41f2b3d71cda (patch)
treee9fe47acf26c5fd2c742677f2610b60d3008eb26 /library/HTMLPurifier/Injector/SafeObject.php
parentb49858b038a0a05bbe7685929e88071d0e125538 (diff)
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Diffstat (limited to 'library/HTMLPurifier/Injector/SafeObject.php')
-rw-r--r--library/HTMLPurifier/Injector/SafeObject.php90
1 files changed, 90 insertions, 0 deletions
diff --git a/library/HTMLPurifier/Injector/SafeObject.php b/library/HTMLPurifier/Injector/SafeObject.php
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+++ b/library/HTMLPurifier/Injector/SafeObject.php
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+<?php
+
+/**
+ * Adds important param elements to inside of object in order to make
+ * things safe.
+ */
+class HTMLPurifier_Injector_SafeObject extends HTMLPurifier_Injector
+{
+ public $name = 'SafeObject';
+ public $needed = array('object', 'param');
+
+ protected $objectStack = array();
+ protected $paramStack = array();
+
+ // Keep this synchronized with AttrTransform/SafeParam.php
+ protected $addParam = array(
+ 'allowScriptAccess' => 'never',
+ 'allowNetworking' => 'internal',
+ );
+ protected $allowedParam = array(
+ 'wmode' => true,
+ 'movie' => true,
+ 'flashvars' => true,
+ 'src' => true,
+ );
+
+ public function prepare($config, $context) {
+ parent::prepare($config, $context);
+ }
+
+ public function handleElement(&$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[$n])) {
+ // keep token, don't do anything to it
+ // (could possibly check for duplicates here)
+ } 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