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<?php declare(strict_types=1);
namespace GraphQL\Validator\Rules;
use GraphQL\Error\Error;
use GraphQL\Language\AST\NodeKind;
use GraphQL\Language\AST\SchemaDefinitionNode;
use GraphQL\Language\AST\SchemaExtensionNode;
use GraphQL\Language\Visitor;
use GraphQL\Language\VisitorOperation;
use 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,
];
}
}