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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\NodeInterface; |
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use Digia\GraphQL\Language\Node\OperationDefinitionNode; |
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use Digia\GraphQL\Language\Node\VariableDefinitionNode; |
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use Digia\GraphQL\Language\Node\VariableNode; |
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use Digia\GraphQL\Type\Definition\NonNullType; |
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use Digia\GraphQL\Type\Definition\TypeInterface; |
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use Digia\GraphQL\Util\TypeComparator; |
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use function Digia\GraphQL\Type\GraphQLNonNull; |
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use function Digia\GraphQL\Util\typeFromAST; |
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use function Digia\GraphQL\Validation\badVariablePositionMessage; |
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/** |
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* Variables in allowed position |
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* |
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* Variables passed to field arguments conform to type. |
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*/ |
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class VariablesInAllowedPositionRule extends AbstractRule |
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{ |
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/** |
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* @var VariableDefinitionNode[]|null |
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*/ |
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protected $variableDefinitionMap; |
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/** |
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* @var TypeComparator |
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*/ |
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protected $typeComparator; |
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/** |
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* VariablesInAllowedPositionRule constructor. |
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*/ |
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public function __construct() |
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{ |
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$this->typeComparator = new TypeComparator(); |
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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 OperationDefinitionNode) { |
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$this->variableDefinitionMap = []; |
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} |
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return $node; |
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} |
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/** |
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* @inheritdoc |
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* @throws InvalidTypeException |
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*/ |
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public function leaveNode(NodeInterface $node): ?NodeInterface |
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{ |
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if ($node instanceof OperationDefinitionNode) { |
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$usages = $this->validationContext->getRecursiveVariableUsages($node); |
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/** |
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* @var VariableNode $variableNode |
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* @var TypeInterface $type |
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*/ |
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foreach ($usages as ['node' => $variableNode, 'type' => $type]) { |
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$variableName = $variableNode->getNameValue(); |
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$variableDefinition = $this->variableDefinitionMap[$variableName]; |
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if (null !== $variableDefinition && null !== $type) { |
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// A var type is allowed if it is the same or more strict (e.g. is |
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// a subtype of) than the expected type. It can be more strict if |
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// the variable type is non-null when the expected type is nullable. |
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// If both are list types, the variable item type can be more strict |
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// than the expected item type (contravariant). |
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$schema = $this->validationContext->getSchema(); |
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$variableType = typeFromAST($schema, $variableDefinition->getType()); |
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if (null !== $variableType && |
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!$this->typeComparator->isTypeSubTypeOf($schema, |
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$this->getEffectiveType($variableType, $variableDefinition), $type)) { |
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$this->validationContext->reportError( |
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new ValidationException( |
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badVariablePositionMessage($variableName, $variableType, $type), |
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[$variableDefinition, $variableNode] |
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) |
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); |
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} |
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} |
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} |
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} |
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if ($node instanceof VariableDefinitionNode) { |
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$this->variableDefinitionMap[$node->getVariable()->getNameValue()] = $node; |
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} |
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return $node; |
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} |
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/** |
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* If a variable definition has a default value, it's effectively non-null. |
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* |
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* @param TypeInterface $variableType |
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* @param VariableDefinitionNode $variableDefinition |
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* @return TypeInterface |
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* @throws InvalidTypeException |
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*/ |
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protected function getEffectiveType( |
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TypeInterface $variableType, |
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VariableDefinitionNode $variableDefinition |
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): TypeInterface { |
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return (!$variableDefinition->hasDefaultValue() || $variableType instanceof NonNullType) |
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? $variableType |
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: GraphQLNonNull($variableType); |
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} |
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} |
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digiaonline /
graphql-php
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