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<?php |
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namespace Digia\GraphQL\Validation\Rule; |
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use Digia\GraphQL\Error\InvalidTypeException; |
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use Digia\GraphQL\Error\ValidationException; |
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use Digia\GraphQL\Language\Node\FragmentSpreadNode; |
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use Digia\GraphQL\Language\Node\InlineFragmentNode; |
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use Digia\GraphQL\Language\Node\NodeInterface; |
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use Digia\GraphQL\Type\Definition\CompositeTypeInterface; |
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use Digia\GraphQL\Type\Definition\TypeInterface; |
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use function Digia\GraphQL\Util\doTypesOverlap; |
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use function Digia\GraphQL\Util\typeFromAST; |
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use function Digia\GraphQL\Validation\typeIncompatibleAnonymousSpreadMessage; |
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use function Digia\GraphQL\Validation\typeIncompatibleSpreadMessage; |
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/** |
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* Possible fragment spread |
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* |
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* A fragment spread is only valid if the type condition could ever possibly |
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* be true: if there is a non-empty intersection of the possible parent types, |
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* and possible types which pass the type condition. |
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*/ |
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class PossibleFragmentSpreadsRule extends AbstractRule |
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{ |
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/** |
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* @inheritdoc |
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*/ |
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public function enterNode(NodeInterface $node): ?NodeInterface |
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{ |
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if ($node instanceof InlineFragmentNode) { |
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$fragmentType = $this->validationContext->getType(); |
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$parentType = $this->validationContext->getParentType(); |
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if ($fragmentType instanceof CompositeTypeInterface && |
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$parentType instanceof CompositeTypeInterface && |
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!doTypesOverlap($this->validationContext->getSchema(), $fragmentType, $parentType)) { |
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$this->validationContext->reportError( |
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new ValidationException( |
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typeIncompatibleAnonymousSpreadMessage($parentType, $fragmentType), |
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[$node] |
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) |
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); |
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} |
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} |
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if ($node instanceof FragmentSpreadNode) { |
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$fragmentName = $node->getNameValue(); |
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$fragmentType = $this->getFragmentType($fragmentName); |
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$parentType = $this->validationContext->getParentType(); |
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if (null !== $fragmentType && |
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null !== $parentType && |
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!doTypesOverlap($this->validationContext->getSchema(), $fragmentType, $parentType)) { |
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$this->validationContext->reportError( |
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new ValidationException( |
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typeIncompatibleSpreadMessage($fragmentName, $parentType, $fragmentType), |
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[$node] |
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) |
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); |
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} |
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} |
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return $node; |
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} |
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/** |
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* @param string $name |
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* @return TypeInterface|null |
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* @throws InvalidTypeException |
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*/ |
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protected function getFragmentType(string $name): ?TypeInterface |
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{ |
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$fragment = $this->validationContext->getFragment($name); |
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if (null === $fragment) { |
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return null; |
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} |
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$type = typeFromAST($this->validationContext->getSchema(), $fragment->getTypeCondition()); |
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return $type instanceof CompositeTypeInterface ? $type : null; |
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} |
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} |
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digiaonline /
graphql-php
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