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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\Validator\SDLValidationContext;
/**
* Lone Schema definition
*
* A GraphQL document is only valid if it contains only one schema definition.
*/
class LoneSchemaDefinition extends ValidationRule
{
public static function schemaDefinitionNotAloneMessage()
return 'Must provide only one schema definition.';
}
public static function canNotDefineSchemaWithinExtensionMessage()
return 'Cannot define a new schema within a schema extension.';
public function getSDLVisitor(SDLValidationContext $context)
$oldSchema = $context->getSchema();
$alreadyDefined = $oldSchema !== null
? (
$oldSchema->getAstNode() ||
$oldSchema->getQueryType() ||
$oldSchema->getMutationType() ||
$oldSchema->getSubscriptionType()
)
: false;
$schemaDefinitionsCount = 0;
return [
NodeKind::SCHEMA_DEFINITION => static function (SchemaDefinitionNode $node) use ($alreadyDefined, $context, &$schemaDefinitionsCount) {
if ($alreadyDefined !== false) {
$context->reportError(new Error(self::canNotDefineSchemaWithinExtensionMessage(), $node));
return;
if ($schemaDefinitionsCount > 0) {
$context->reportError(new Error(self::schemaDefinitionNotAloneMessage(), $node));
++$schemaDefinitionsCount;
},
];
webonyx /
graphql-php
