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<?php /* * This file is part of Twig. * * (c) 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. * * @final * * @author Fabien Potencier <fabien@symfony.com> */ class Twig_NodeVisitor_Sandbox extends Twig_BaseNodeVisitor { protected $inAModule = false; protected $tags; protected $filters; protected $functions; 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')] = $node; } // wrap print to check __toString() calls if ($node instanceof Twig_Node_Print) { return new Twig_Node_SandboxedPrint($node->getNode('expr'), $node->getTemplateLine(), $node->getNodeTag()); } } return $node; } 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')))); } return $node; } public function getPriority() { return 0; } }