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<?php |
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/* |
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* This file is part of the OverblogGraphQLBundle package. |
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* |
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* (c) Overblog <http://github.com/overblog/> |
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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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namespace Overblog\GraphQLBundle\Request\Validator\Rule; |
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use GraphQL\Error; |
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use GraphQL\Language\AST\Field; |
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use GraphQL\Language\AST\FragmentDefinition; |
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use GraphQL\Language\AST\FragmentSpread; |
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use GraphQL\Language\AST\InlineFragment; |
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use GraphQL\Language\AST\Node; |
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use GraphQL\Language\AST\SelectionSet; |
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use GraphQL\Type\Definition\WrappingType; |
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use GraphQL\Validator\ValidationContext; |
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class MaxQueryDepth |
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{ |
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const DEFAULT_QUERY_MAX_DEPTH = 100; |
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const DEFAULT_MAX_COUNT_AFTER_DEPTH_LIMIT = 50; |
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private static $maxQueryDepth; |
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private $fragments = []; |
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public function __construct($maxQueryDepth = self::DEFAULT_QUERY_MAX_DEPTH) |
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{ |
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$this->setMaxQueryDepth($maxQueryDepth); |
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} |
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public static function setMaxQueryDepth($maxQueryDepth) |
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{ |
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self::$maxQueryDepth = (int) $maxQueryDepth; |
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} |
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public static function maxQueryDepthErrorMessage($max, $count) |
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{ |
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return sprintf('Max query depth should be %d but is greater or equal to %d.', $max, $count); |
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} |
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public function __invoke(ValidationContext $context) |
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{ |
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// Gather all the fragment definition. |
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// Importantly this does not include inline fragments. |
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$definitions = $context->getDocument()->definitions; |
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foreach ($definitions as $node) { |
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if ($node instanceof FragmentDefinition) { |
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$this->fragments[$node->name->value] = $node; |
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} |
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} |
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$schema = $context->getSchema(); |
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$rootTypes = [$schema->getQueryType(), $schema->getMutationType(), $schema->getSubscriptionType()]; |
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return [ |
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Node::FIELD => $this->getFieldClosure($context, $rootTypes), |
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]; |
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} |
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private function getFieldClosure(ValidationContext $context, array $rootTypes) |
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{ |
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return function (Field $node) use ($context, $rootTypes) { |
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$parentType = $context->getParentType(); |
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$type = $this->retrieveCurrentTypeFromValidationContext($context); |
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$isIntrospectionType = $type && $type->name === '__Schema'; |
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$isParentRootType = $parentType && in_array($parentType, $rootTypes); |
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// check depth only on first rootTypes children and ignore check on introspection query |
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if ($isParentRootType && !$isIntrospectionType) { |
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$depth = $node->selectionSet ? |
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$this->countSelectionDepth( |
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$node->selectionSet, |
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self::$maxQueryDepth + static::DEFAULT_MAX_COUNT_AFTER_DEPTH_LIMIT, |
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0, |
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true |
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) : |
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0 |
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; |
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if ($depth > self::$maxQueryDepth) { |
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return new Error(static::maxQueryDepthErrorMessage(self::$maxQueryDepth, $depth), [$node]); |
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} |
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} |
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}; |
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} |
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private function retrieveCurrentTypeFromValidationContext(ValidationContext $context) |
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{ |
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$type = $context->getType(); |
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if ($type instanceof WrappingType) { |
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$type = $type->getWrappedType(true); |
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} |
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return $type; |
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} |
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private function countSelectionDepth(SelectionSet $selectionSet, $stopCountingAt, $depth = 0, $resetDepthForEachSelection = false) |
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{ |
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foreach ($selectionSet->selections as $selectionAST) { |
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if ($depth >= $stopCountingAt) { |
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break; |
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} |
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$depth = $resetDepthForEachSelection ? 0 : $depth; |
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if ($selectionAST instanceof Field) { |
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$depth = $this->countFieldDepth($selectionAST->selectionSet, $stopCountingAt, $depth); |
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} elseif ($selectionAST instanceof FragmentSpread) { |
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$depth = $this->countFragmentDepth($selectionAST, $stopCountingAt, $depth); |
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} elseif ($selectionAST instanceof InlineFragment) { |
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$depth = $this->countInlineFragmentDepth($selectionAST->selectionSet, $stopCountingAt, $depth); |
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} |
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} |
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return $depth; |
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} |
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private function countFieldDepth(SelectionSet $selectionSet = null, $stopCountingAt, $depth) |
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{ |
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return null === $selectionSet ? $depth : $this->countSelectionDepth($selectionSet, $stopCountingAt, ++$depth); |
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} |
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private function countInlineFragmentDepth(SelectionSet $selectionSet = null, $stopCountingAt, $depth) |
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{ |
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return null === $selectionSet ? $depth : $this->countSelectionDepth($selectionSet, $stopCountingAt, $depth); |
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} |
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private function countFragmentDepth(FragmentSpread $selectionAST, $stopCountingAt, $depth) |
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{ |
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$spreadName = $selectionAST->name->value; |
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if (isset($this->fragments[$spreadName])) { |
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/** @var FragmentDefinition $fragment */ |
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$fragment = $this->fragments[$spreadName]; |
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$depth = $this->countSelectionDepth($fragment->selectionSet, $stopCountingAt, $depth); |
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} |
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return $depth; |
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} |
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} |
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overblog /
GraphQLBundle
