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<?php
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/*
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* This file is part of Twig.
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*
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* (c) 2009 Fabien Potencier
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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/**
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* Twig_NodeVisitor_Sandbox implements sandboxing.
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*
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_NodeVisitor_Sandbox extends Twig_BaseNodeVisitor
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{
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protected $inAModule = false;
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protected $tags;
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protected $filters;
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protected $functions;
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/**
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* {@inheritdoc}
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*/
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protected function doEnterNode(Twig_Node $node, Twig_Environment $env)
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{
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if ($node instanceof Twig_Node_Module) {
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$this->inAModule = true;
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$this->tags = array();
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$this->filters = array();
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$this->functions = array();
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return $node;
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} elseif ($this->inAModule) {
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// look for tags
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if ($node->getNodeTag() && !isset($this->tags[$node->getNodeTag()])) {
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$this->tags[$node->getNodeTag()] = $node;
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}
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// look for filters
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if ($node instanceof Twig_Node_Expression_Filter && !isset($this->filters[$node->getNode('filter')->getAttribute('value')])) {
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$this->filters[$node->getNode('filter')->getAttribute('value')] = $node;
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}
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// look for functions
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if ($node instanceof Twig_Node_Expression_Function && !isset($this->functions[$node->getAttribute('name')])) {
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$this->functions[$node->getAttribute('name')] = $node;
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}
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// wrap print to check __toString() calls
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if ($node instanceof Twig_Node_Print) {
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return new Twig_Node_SandboxedPrint($node->getNode('expr'), $node->getLine(), $node->getNodeTag());
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}
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}
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return $node;
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}
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/**
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* {@inheritdoc}
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*/
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protected function doLeaveNode(Twig_Node $node, Twig_Environment $env)
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{
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if ($node instanceof Twig_Node_Module) {
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$this->inAModule = false;
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$node->setNode('display_start', new Twig_Node(array(new Twig_Node_CheckSecurity($this->filters, $this->tags, $this->functions), $node->getNode('display_start'))));
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}
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return $node;
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}
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/**
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* {@inheritdoc}
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*/
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public function getPriority()
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{
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return 0;
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}
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}
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