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<?php |
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declare(strict_types=1); |
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namespace GraphQL\Type\Validation; |
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use GraphQL\Language\AST\InputValueDefinitionNode; |
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use GraphQL\Type\Definition\InputObjectField; |
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use GraphQL\Type\Definition\InputObjectType; |
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use GraphQL\Type\Definition\NonNull; |
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use GraphQL\Type\SchemaValidationContext; |
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use function array_map; |
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use function array_pop; |
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use function array_slice; |
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use function count; |
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use function implode; |
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class InputObjectCircularRefs |
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{ |
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/** @var SchemaValidationContext */ |
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private $schemaValidationContext; |
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/** |
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* Tracks already visited types to maintain O(N) and to ensure that cycles |
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* are not redundantly reported. |
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* |
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* @var InputObjectType[] |
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*/ |
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private $visitedTypes = []; |
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/** @var InputObjectField[] */ |
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private $fieldPath = []; |
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/** |
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* Position in the type path. |
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* |
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* [string $typeName => int $index] |
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* |
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* @var int[] |
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*/ |
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private $fieldPathIndexByTypeName = []; |
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87 |
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public function __construct(SchemaValidationContext $schemaValidationContext) |
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{ |
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$this->schemaValidationContext = $schemaValidationContext; |
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} |
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/** |
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* This does a straight-forward DFS to find cycles. |
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* It does not terminate when a cycle was found but continues to explore |
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* the graph to find all possible cycles. |
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*/ |
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public function validate(InputObjectType $inputObj) : void |
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{ |
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if (isset($this->visitedTypes[$inputObj->name])) { |
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return; |
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} |
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$this->visitedTypes[$inputObj->name] = true; |
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$this->fieldPathIndexByTypeName[$inputObj->name] = count($this->fieldPath); |
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$fieldMap = $inputObj->getFields(); |
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foreach ($fieldMap as $fieldName => $field) { |
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$type = $field->getType(); |
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if ($type instanceof NonNull) { |
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$fieldType = $type->getWrappedType(); |
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// If the type of the field is anything else then a non-nullable input object, |
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// there is no chance of an unbreakable cycle |
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if ($fieldType instanceof InputObjectType) { |
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$this->fieldPath[] = $field; |
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if (! isset($this->fieldPathIndexByTypeName[$fieldType->name])) { |
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3 |
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$this->validate($fieldType); |
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} else { |
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$cycleIndex = $this->fieldPathIndexByTypeName[$fieldType->name]; |
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3 |
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$cyclePath = array_slice($this->fieldPath, $cycleIndex); |
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3 |
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$fieldNames = array_map( |
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static function (InputObjectField $field) : string { |
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return $field->name; |
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}, |
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3 |
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$cyclePath |
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); |
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$this->schemaValidationContext->reportError( |
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'Cannot reference Input Object "' . $fieldType->name . '" within itself ' |
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. 'through a series of non-null fields: "' . implode('.', $fieldNames) . '".', |
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array_map( |
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static function (InputObjectField $field) : ?InputValueDefinitionNode { |
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return $field->astNode; |
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}, |
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$cyclePath |
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) |
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); |
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} |
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} |
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} |
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array_pop($this->fieldPath); |
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} |
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unset($this->fieldPathIndexByTypeName[$inputObj->name]); |
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} |
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} |
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webonyx /
graphql-php
