60 lines
1.7 KiB
PHP
60 lines
1.7 KiB
PHP
<?php
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declare(strict_types=1);
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namespace GraphQL\Validator\Rules;
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use GraphQL\Error\Error;
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use GraphQL\Language\AST\NodeKind;
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use GraphQL\Language\AST\SchemaDefinitionNode;
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use GraphQL\Validator\SDLValidationContext;
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/**
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* Lone Schema definition
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*
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* A GraphQL document is only valid if it contains only one schema definition.
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*/
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class LoneSchemaDefinition extends ValidationRule
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{
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public static function schemaDefinitionNotAloneMessage()
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{
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return 'Must provide only one schema definition.';
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}
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public static function canNotDefineSchemaWithinExtensionMessage()
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{
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return 'Cannot define a new schema within a schema extension.';
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}
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public function getSDLVisitor(SDLValidationContext $context)
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{
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$oldSchema = $context->getSchema();
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$alreadyDefined = $oldSchema !== null
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? (
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$oldSchema->getAstNode() !== null ||
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$oldSchema->getQueryType() !== null ||
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$oldSchema->getMutationType() !== null ||
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$oldSchema->getSubscriptionType() !== null
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)
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: false;
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$schemaDefinitionsCount = 0;
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return [
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NodeKind::SCHEMA_DEFINITION => static function (SchemaDefinitionNode $node) use ($alreadyDefined, $context, &$schemaDefinitionsCount) : void {
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if ($alreadyDefined !== false) {
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$context->reportError(new Error(self::canNotDefineSchemaWithinExtensionMessage(), $node));
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return;
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}
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if ($schemaDefinitionsCount > 0) {
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$context->reportError(new Error(self::schemaDefinitionNotAloneMessage(), $node));
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}
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++$schemaDefinitionsCount;
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},
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];
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}
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}
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