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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. */ namespace Twig\NodeVisitor; use Twig\Environment; use Twig\Node\CheckSecurityNode; use Twig\Node\CheckToStringNode; use Twig\Node\Expression\Binary\ConcatBinary; use Twig\Node\Expression\Binary\RangeBinary; use Twig\Node\Expression\FilterExpression; use Twig\Node\Expression\FunctionExpression; use Twig\Node\Expression\GetAttrExpression; use Twig\Node\Expression\NameExpression; use Twig\Node\ModuleNode; use Twig\Node\Node; use Twig\Node\PrintNode; use Twig\Node\SetNode; /** * @author Fabien Potencier <fabien@symfony.com> */ final class SandboxNodeVisitor extends AbstractNodeVisitor { private $inAModule = false; private $tags; private $filters; private $functions; private $needsToStringWrap = false; protected function doEnterNode(Node $node, Environment $env) { if ($node instanceof ModuleNode) { $this->inAModule = true; $this->tags = []; $this->filters = []; $this->functions = []; 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 FilterExpression && !isset($this->filters[$node->getNode('filter')->getAttribute('value')])) { $this->filters[$node->getNode('filter')->getAttribute('value')] = $node; } // look for functions if ($node instanceof FunctionExpression && !isset($this->functions[$node->getAttribute('name')])) { $this->functions[$node->getAttribute('name')] = $node; } // the .. operator is equivalent to the range() function if ($node instanceof RangeBinary && !isset($this->functions['range'])) { $this->functions['range'] = $node; } if ($node instanceof PrintNode) { $this->needsToStringWrap = true; $this->wrapNode($node, 'expr'); } if ($node instanceof SetNode && !$node->getAttribute('capture')) { $this->needsToStringWrap = true; } // wrap outer nodes that can implicitly call __toString() if ($this->needsToStringWrap) { if ($node instanceof ConcatBinary) { $this->wrapNode($node, 'left'); $this->wrapNode($node, 'right'); } if ($node instanceof FilterExpression) { $this->wrapNode($node, 'node'); $this->wrapArrayNode($node, 'arguments'); } if ($node instanceof FunctionExpression) { $this->wrapArrayNode($node, 'arguments'); } } } return $node; } protected function doLeaveNode(Node $node, Environment $env) { if ($node instanceof ModuleNode) { $this->inAModule = false; $node->getNode('constructor_end')->setNode('_security_check', new Node([new CheckSecurityNode($this->filters, $this->tags, $this->functions), $node->getNode('display_start')])); } elseif ($this->inAModule) { if ($node instanceof PrintNode || $node instanceof SetNode) { $this->needsToStringWrap = false; } } return $node; } private function wrapNode(Node $node, string $name) { $expr = $node->getNode($name); if ($expr instanceof NameExpression || $expr instanceof GetAttrExpression) { $node->setNode($name, new CheckToStringNode($expr)); } } private function wrapArrayNode(Node $node, string $name) { $args = $node->getNode($name); foreach ($args as $name => $_) { $this->wrapNode($args, $name); } } public function getPriority() { return 0; } } class_alias('Twig\NodeVisitor\SandboxNodeVisitor', 'Twig_NodeVisitor_Sandbox');