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<?php declare(strict_types=1); namespace YOOtheme\GraphQL\Validator\Rules; use YOOtheme\GraphQL\Error\Error; use YOOtheme\GraphQL\Language\AST\NodeKind; use YOOtheme\GraphQL\Language\AST\SchemaDefinitionNode; use YOOtheme\GraphQL\Language\AST\SchemaExtensionNode; use YOOtheme\GraphQL\Language\Visitor; use YOOtheme\GraphQL\Language\VisitorOperation; use YOOtheme\GraphQL\Validator\SDLValidationContext; /** * Unique operation types. * * A GraphQL document is only valid if it has only one type per operation. */ class UniqueOperationTypes extends ValidationRule { public function getSDLVisitor(SDLValidationContext $context): array { $schema = $context->getSchema(); $definedOperationTypes = []; $existingOperationTypes = $schema !== null ? [ 'query' => $schema->getQueryType(), 'mutation' => $schema->getMutationType(), 'subscription' => $schema->getSubscriptionType(), ] : []; /** * @param SchemaDefinitionNode|SchemaExtensionNode $node */ $checkOperationTypes = static function ($node) use ($context, &$definedOperationTypes, $existingOperationTypes): VisitorOperation { foreach ($node->operationTypes as $operationType) { $operation = $operationType->operation; $alreadyDefinedOperationType = $definedOperationTypes[$operation] ?? null; if (isset($existingOperationTypes[$operation])) { $context->reportError( new Error( "Type for {$operation} already defined in the schema. It cannot be redefined.", $operationType, ), ); } elseif ($alreadyDefinedOperationType !== null) { $context->reportError( new Error( "There can be only one {$operation} type in schema.", [$alreadyDefinedOperationType, $operationType], ), ); } else { $definedOperationTypes[$operation] = $operationType; } } return Visitor::skipNode(); }; return [ NodeKind::SCHEMA_DEFINITION => $checkOperationTypes, NodeKind::SCHEMA_EXTENSION => $checkOperationTypes, ]; } }
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