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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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* @package twig
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* @author Fabien Potencier <fabien@symfony.com>
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*/
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class Twig_NodeVisitor_Sandbox implements Twig_NodeVisitorInterface
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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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* Called before child nodes are visited.
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*
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* @param Twig_NodeInterface $node The node to visit
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* @param Twig_Environment $env The Twig environment instance
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*
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* @return Twig_NodeInterface The modified node
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*/
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public function enterNode(Twig_NodeInterface $node, Twig_Environment $env)
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{
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// in a sandbox tag, only include tags are allowed
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if ($node instanceof Twig_Node_Sandbox && !$node->getNode('body') instanceof Twig_Node_Include) {
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foreach ($node->getNode('body') as $n) {
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if ($n instanceof Twig_Node_Text && ctype_space($n->getAttribute('data'))) {
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continue;
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}
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if (!$n instanceof Twig_Node_Include) {
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throw new Twig_Error_Syntax('Only "include" tags are allowed within a "sandbox" section', $n->getLine());
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}
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}
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}
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if ($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 ($node->getNodeTag()) {
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$this->tags[] = $node->getNodeTag();
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}
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// look for filters
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if ($node instanceof Twig_Node_Expression_Filter) {
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$this->filters[] = $node->getNode('filter')->getAttribute('value');
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}
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// look for functions
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if ($node instanceof Twig_Node_Expression_Function) {
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$this->functions[] = $node->getAttribute('name');
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}
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// wrap print to check __toString() calls
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if ($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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* Called after child nodes are visited.
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*
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* @param Twig_NodeInterface $node The node to visit
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* @param Twig_Environment $env The Twig environment instance
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*
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* @return Twig_NodeInterface The modified node
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*/
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public function leaveNode(Twig_NodeInterface $node, Twig_Environment $env)
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{
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if ($node instanceof Twig_Node_Module) {
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$this->inAModule = false;
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return new Twig_Node_SandboxedModule($node, array_unique($this->filters), array_unique($this->tags), array_unique($this->functions));
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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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