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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\OperationDefinitionNode; use YOOtheme\GraphQL\Language\Visitor; use YOOtheme\GraphQL\Language\VisitorOperation; use YOOtheme\GraphQL\Validator\QueryValidationContext; class SingleFieldSubscription extends ValidationRule { public function getVisitor(QueryValidationContext $context): array { return [ NodeKind::OPERATION_DEFINITION => static function (OperationDefinitionNode $node) use ($context): VisitorOperation { if ($node->operation === 'subscription') { $selections = $node->selectionSet->selections; if (count($selections) > 1) { $offendingSelections = $selections->splice(1, count($selections)); $context->reportError(new Error( static::multipleFieldsInOperation($node->name->value ?? null), $offendingSelections )); } } return Visitor::skipNode(); }, ]; } public static function multipleFieldsInOperation(?string $operationName): string { if ($operationName === null) { return 'Anonymous Subscription must select only one top level field.'; } return "Subscription \"{$operationName}\" must select only one top level field."; } }
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