diff -r 6d109e3804ac -r 9a001a04b634 Twig-1.3.0/lib/Twig/Extension/Sandbox.php
--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/Twig-1.3.0/lib/Twig/Extension/Sandbox.php	Tue Oct 25 23:56:28 2011 +0200
@@ -0,0 +1,112 @@
+<?php
+
+/*
+ * This file is part of Twig.
+ *
+ * (c) 2009 Fabien Potencier
+ *
+ * For the full copyright and license information, please view the LICENSE
+ * file that was distributed with this source code.
+ */
+class Twig_Extension_Sandbox extends Twig_Extension
+{
+    protected $sandboxedGlobally;
+    protected $sandboxed;
+    protected $policy;
+
+    public function __construct(Twig_Sandbox_SecurityPolicyInterface $policy, $sandboxed = false)
+    {
+        $this->policy            = $policy;
+        $this->sandboxedGlobally = $sandboxed;
+    }
+
+    /**
+     * Returns the token parser instances to add to the existing list.
+     *
+     * @return array An array of Twig_TokenParserInterface or Twig_TokenParserBrokerInterface instances
+     */
+    public function getTokenParsers()
+    {
+        return array(new Twig_TokenParser_Sandbox());
+    }
+
+    /**
+     * Returns the node visitor instances to add to the existing list.
+     *
+     * @return array An array of Twig_NodeVisitorInterface instances
+     */
+    public function getNodeVisitors()
+    {
+        return array(new Twig_NodeVisitor_Sandbox());
+    }
+
+    public function enableSandbox()
+    {
+        $this->sandboxed = true;
+    }
+
+    public function disableSandbox()
+    {
+        $this->sandboxed = false;
+    }
+
+    public function isSandboxed()
+    {
+        return $this->sandboxedGlobally || $this->sandboxed;
+    }
+
+    public function isSandboxedGlobally()
+    {
+        return $this->sandboxedGlobally;
+    }
+
+    public function setSecurityPolicy(Twig_Sandbox_SecurityPolicyInterface $policy)
+    {
+        $this->policy = $policy;
+    }
+
+    public function getSecurityPolicy()
+    {
+        return $this->policy;
+    }
+
+    public function checkSecurity($tags, $filters, $functions)
+    {
+        if ($this->isSandboxed()) {
+            $this->policy->checkSecurity($tags, $filters, $functions);
+        }
+    }
+
+    public function checkMethodAllowed($obj, $method)
+    {
+        if ($this->isSandboxed()) {
+            $this->policy->checkMethodAllowed($obj, $method);
+        }
+    }
+
+    public function checkPropertyAllowed($obj, $method)
+    {
+        if ($this->isSandboxed()) {
+            $this->policy->checkPropertyAllowed($obj, $method);
+        }
+    }
+
+    public function ensureToStringAllowed($obj)
+    {
+        if (is_object($obj)) {
+            $this->policy->checkMethodAllowed($obj, '__toString');
+        }
+
+        return $obj;
+    }
+
+    /**
+     * Returns the name of the extension.
+     *
+     * @return string The extension name
+     */
+    public function getName()
+    {
+        return 'sandbox';
+    }
+}