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<?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.
*/
/**
* Twig_NodeVisitor_Sandbox implements sandboxing.
*
* @author Fabien Potencier <fabien@symfony.com>
*/
class Twig_NodeVisitor_Sandbox extends Twig_BaseNodeVisitor
{
protected $inAModule = false;
protected $tags;
protected $filters;
protected $functions;
private $needsToStringWrap = false;
/**
* {@inheritdoc}
*/
protected function doEnterNode(Twig_Node $node, Twig_Environment $env)
{
if ($node instanceof Twig_Node_Module) {
$this->inAModule = true;
$this->tags = array();
$this->filters = array();
$this->functions = array();
return $node;
} elseif ($this->inAModule) {
// look for tags
if ($node->getNodeTag() && !isset($this->tags[$node->getNodeTag()])) {
$this->tags[$node->getNodeTag()] = $node;
}
// look for filters
if ($node instanceof Twig_Node_Expression_Filter && !isset($this->filters[$node->getNode('filter')->getAttribute('value')])) {
$this->filters[$node->getNode('filter')->getAttribute('value')] = $node;
}
// look for functions
if ($node instanceof Twig_Node_Expression_Function && !isset($this->functions[$node->getAttribute('name')])) {
$this->functions[$node->getAttribute('name')] = $node;
}
if ($node instanceof Twig_Node_Print) {
$this->needsToStringWrap = true;
$this->wrapNode($node, 'expr');
}
if ($node instanceof Twig_Node_Set && !$node->getAttribute('capture')) {
$this->needsToStringWrap = true;
}
// wrap outer nodes that can implicitly call __toString()
if ($this->needsToStringWrap) {
if ($node instanceof Twig_Node_Expression_Binary_Concat) {
$this->wrapNode($node, 'left');
$this->wrapNode($node, 'right');
}
if ($node instanceof Twig_Node_Expression_Filter) {
$this->wrapNode($node, 'node');
$this->wrapArrayNode($node, 'arguments');
}
if ($node instanceof Twig_Node_Expression_Function) {
$this->wrapArrayNode($node, 'arguments');
}
}
}
return $node;
}
/**
* {@inheritdoc}
*/
protected function doLeaveNode(Twig_Node $node, Twig_Environment $env)
{
if ($node instanceof Twig_Node_Module) {
$this->inAModule = false;
$node->setNode('display_start', new Twig_Node(array(new Twig_Node_CheckSecurity($this->filters, $this->tags, $this->functions), $node->getNode('display_start'))));
} elseif ($this->inAModule) {
if ($node instanceof Twig_Node_Print || $node instanceof Twig_Node_Set) {
$this->needsToStringWrap = false;
}
}
return $node;
}
private function wrapNode(Twig_Node $node, $name)
{
$expr = $node->getNode($name);
if ($expr instanceof Twig_Node_Expression_Name || $expr instanceof Twig_Node_Expression_GetAttr) {
$node->setNode($name, new Twig_Node_CheckToString($expr));
}
}
private function wrapArrayNode(Twig_Node $node, $name)
{
$args = $node->getNode($name);
foreach ($args as $name => $_) {
$this->wrapNode($args, $name);
}
}
/**
* {@inheritdoc}
*/
public function getPriority()
{
return 0;
}
}
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