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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\Extension\EscaperExtension; use Twig\Node\AutoEscapeNode; use Twig\Node\BlockNode; use Twig\Node\BlockReferenceNode; use Twig\Node\Expression\AbstractExpression; use Twig\Node\Expression\ConstantExpression; use Twig\Node\Expression\FilterExpression; use Twig\Node\Expression\OperatorEscapeInterface; use Twig\Node\ImportNode; use Twig\Node\ModuleNode; use Twig\Node\Node; use Twig\Node\Nodes; use Twig\Node\PrintNode; use Twig\NodeTraverser; /** * @author Fabien Potencier <fabien@symfony.com> * * @internal */ final class EscaperNodeVisitor implements NodeVisitorInterface { private $statusStack = []; private $blocks = []; private $safeAnalysis; private $traverser; private $defaultStrategy = false; private $safeVars = []; public function __construct() { $this->safeAnalysis = new SafeAnalysisNodeVisitor(); } public function enterNode(Node $node, Environment $env): Node { if ($node instanceof ModuleNode) { if ($env->hasExtension(EscaperExtension::class) && $defaultStrategy = $env->getExtension(EscaperExtension::class)->getDefaultStrategy($node->getTemplateName())) { $this->defaultStrategy = $defaultStrategy; } $this->safeVars = []; $this->blocks = []; } elseif ($node instanceof AutoEscapeNode) { $this->statusStack[] = $node->getAttribute('value'); } elseif ($node instanceof BlockNode) { $this->statusStack[] = $this->blocks[$node->getAttribute('name')] ?? $this->needEscaping(); } elseif ($node instanceof ImportNode) { $this->safeVars[] = $node->getNode('var')->getNode('var')->getAttribute('name'); } return $node; } public function leaveNode(Node $node, Environment $env): ?Node { if ($node instanceof ModuleNode) { $this->defaultStrategy = false; $this->safeVars = []; $this->blocks = []; } elseif ($node instanceof FilterExpression) { return $this->preEscapeFilterNode($node, $env); } elseif ($node instanceof PrintNode && false !== $type = $this->needEscaping()) { $expression = $node->getNode('expr'); if ($expression instanceof OperatorEscapeInterface) { $this->escapeConditional($expression, $env, $type); } else { $node->setNode('expr', $this->escapeExpression($expression, $env, $type)); } return $node; } if ($node instanceof AutoEscapeNode || $node instanceof BlockNode) { array_pop($this->statusStack); } elseif ($node instanceof BlockReferenceNode) { $this->blocks[$node->getAttribute('name')] = $this->needEscaping(); } return $node; } /** * @param AbstractExpression&OperatorEscapeInterface $expression */ private function escapeConditional($expression, Environment $env, string $type): void { foreach ($expression->getOperandNamesToEscape() as $name) { /** @var AbstractExpression $operand */ $operand = $expression->getNode($name); if ($operand instanceof OperatorEscapeInterface) { $this->escapeConditional($operand, $env, $type); } else { $expression->setNode($name, $this->escapeExpression($operand, $env, $type)); } } } private function escapeExpression(AbstractExpression $expression, Environment $env, string $type): AbstractExpression { return $this->isSafeFor($type, $expression, $env) ? $expression : $this->getEscaperFilter($env, $type, $expression); } private function preEscapeFilterNode(FilterExpression $filter, Environment $env): FilterExpression { if ($filter->hasAttribute('twig_callable')) { $type = $filter->getAttribute('twig_callable')->getPreEscape(); } else { // legacy $name = $filter->getNode('filter', false)->getAttribute('value'); $type = $env->getFilter($name)->getPreEscape(); } if (null === $type) { return $filter; } /** @var AbstractExpression $node */ $node = $filter->getNode('node'); if ($this->isSafeFor($type, $node, $env)) { return $filter; } $filter->setNode('node', $this->getEscaperFilter($env, $type, $node)); return $filter; } private function isSafeFor(string $type, AbstractExpression $expression, Environment $env): bool { $safe = $this->safeAnalysis->getSafe($expression); if (!$safe) { if (null === $this->traverser) { $this->traverser = new NodeTraverser($env, [$this->safeAnalysis]); } $this->safeAnalysis->setSafeVars($this->safeVars); $this->traverser->traverse($expression); $safe = $this->safeAnalysis->getSafe($expression); } return \in_array($type, $safe) || \in_array('all', $safe); } /** * @return string|false */ private function needEscaping(): string|bool { if (\count($this->statusStack)) { return $this->statusStack[\count($this->statusStack) - 1]; } return $this->defaultStrategy ?: false; } private function getEscaperFilter(Environment $env, string $type, AbstractExpression $node): FilterExpression { $line = $node->getTemplateLine(); $filter = $env->getFilter('escape'); $args = new Nodes([new ConstantExpression($type, $line), new ConstantExpression(null, $line), new ConstantExpression(true, $line)]); return new FilterExpression($node, $filter, $args, $line); } public function getPriority(): int { return 0; } }
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