From 6854cb3f4d8219cf1829e32122eb2502a916eae9 Mon Sep 17 00:00:00 2001
From: Andreas Baumann <mail@andreasbaumann.cc>
Date: Sat, 1 Feb 2020 09:05:48 +0100
Subject: initial checkin

---
 .../library/HTMLPurifier/Injector/SafeObject.php   | 124 +++++++++++++++++++++
 1 file changed, 124 insertions(+)
 create mode 100644 vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php

(limited to 'vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php')

diff --git a/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php
new file mode 100644
index 0000000..317f786
--- /dev/null
+++ b/vendor/ezyang/htmlpurifier/library/HTMLPurifier/Injector/SafeObject.php
@@ -0,0 +1,124 @@
+<?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
-- 
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