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valentin-dassonvillevalentin-dassonville
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fix(hal): detecting and handling circular reference (#6752)
Co-authored-by: Valentin Dassonville <[email protected]>
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‎src/Hal/Serializer/ItemNormalizer.php‎

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@@ -13,14 +13,26 @@
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namespace ApiPlatform\Hal\Serializer;
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use ApiPlatform\Metadata\IriConverterInterface;
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use ApiPlatform\Metadata\Property\Factory\PropertyMetadataFactoryInterface;
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use ApiPlatform\Metadata\Property\Factory\PropertyNameCollectionFactoryInterface;
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use ApiPlatform\Metadata\Resource\Factory\ResourceMetadataCollectionFactoryInterface;
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use ApiPlatform\Metadata\ResourceAccessCheckerInterface;
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use ApiPlatform\Metadata\ResourceClassResolverInterface;
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use ApiPlatform\Metadata\UrlGeneratorInterface;
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use ApiPlatform\Metadata\Util\ClassInfoTrait;
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use ApiPlatform\Serializer\AbstractItemNormalizer;
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use ApiPlatform\Serializer\CacheKeyTrait;
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use ApiPlatform\Serializer\ContextTrait;
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use ApiPlatform\Serializer\TagCollectorInterface;
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use Symfony\Component\PropertyAccess\PropertyAccessorInterface;
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use Symfony\Component\Serializer\Exception\CircularReferenceException;
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use Symfony\Component\Serializer\Exception\LogicException;
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use Symfony\Component\Serializer\Exception\UnexpectedValueException;
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use Symfony\Component\Serializer\Mapping\AttributeMetadataInterface;
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use Symfony\Component\Serializer\Mapping\Factory\ClassMetadataFactoryInterface;
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use Symfony\Component\Serializer\NameConverter\NameConverterInterface;
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use Symfony\Component\Serializer\Normalizer\AbstractNormalizer;
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/**
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* Converts between objects and array including HAL metadata.
@@ -35,9 +47,25 @@ final class ItemNormalizer extends AbstractItemNormalizer
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public const FORMAT = 'jsonhal';
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protected const HAL_CIRCULAR_REFERENCE_LIMIT_COUNTERS = 'hal_circular_reference_limit_counters';
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private array $componentsCache = [];
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private array $attributesMetadataCache = [];
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public function __construct(PropertyNameCollectionFactoryInterface $propertyNameCollectionFactory, PropertyMetadataFactoryInterface $propertyMetadataFactory, IriConverterInterface $iriConverter, ResourceClassResolverInterface $resourceClassResolver, ?PropertyAccessorInterface $propertyAccessor = null, ?NameConverterInterface $nameConverter = null, ?ClassMetadataFactoryInterface $classMetadataFactory = null, array $defaultContext = [], ?ResourceMetadataCollectionFactoryInterface $resourceMetadataCollectionFactory = null, ?ResourceAccessCheckerInterface $resourceAccessChecker = null, ?TagCollectorInterface $tagCollector = null)
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{
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$defaultContext[AbstractNormalizer::CIRCULAR_REFERENCE_HANDLER] = function ($object): ?array {
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$iri = $this->iriConverter->getIriFromResource($object);
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if (null === $iri) {
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return null;
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}
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return ['_links' => ['self' => ['href' => $iri]]];
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};
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parent::__construct($propertyNameCollectionFactory, $propertyMetadataFactory, $iriConverter, $resourceClassResolver, $propertyAccessor, $nameConverter, $classMetadataFactory, $defaultContext, $resourceMetadataCollectionFactory, $resourceAccessChecker, $tagCollector);
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}
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/**
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* {@inheritdoc}
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*/
@@ -216,6 +244,10 @@ private function populateRelation(array $data, object $object, ?string $format,
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{
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$class = $this->getObjectClass($object);
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if ($this->isHalCircularReference($object, $context)) {
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return $this->handleHalCircularReference($object, $format, $context);
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}
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$attributesMetadata = \array_key_exists($class, $this->attributesMetadataCache) ?
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$this->attributesMetadataCache[$class] :
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$this->attributesMetadataCache[$class] = $this->classMetadataFactory ? $this->classMetadataFactory->getMetadataFor($class)->getAttributesMetadata() : null;
@@ -319,4 +351,49 @@ private function isMaxDepthReached(array $attributesMetadata, string $class, str
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return false;
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}
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/**
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* Detects if the configured circular reference limit is reached.
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*
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* @throws CircularReferenceException
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*/
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protected function isHalCircularReference(object $object, array &$context): bool
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{
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$objectHash = spl_object_hash($object);
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$circularReferenceLimit = $context[AbstractNormalizer::CIRCULAR_REFERENCE_LIMIT] ?? $this->defaultContext[AbstractNormalizer::CIRCULAR_REFERENCE_LIMIT];
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if (isset($context[self::HAL_CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash])) {
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if ($context[self::HAL_CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash] >= $circularReferenceLimit) {
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unset($context[self::HAL_CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash]);
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return true;
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}
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++$context[self::HAL_CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash];
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} else {
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$context[self::HAL_CIRCULAR_REFERENCE_LIMIT_COUNTERS][$objectHash] = 1;
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}
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return false;
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}
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/**
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* Handles a circular reference.
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*
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* If a circular reference handler is set, it will be called. Otherwise, a
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* {@class CircularReferenceException} will be thrown.
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*
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* @final
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*
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* @throws CircularReferenceException
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*/
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protected function handleHalCircularReference(object $object, ?string $format = null, array $context = []): mixed
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{
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$circularReferenceHandler = $context[AbstractNormalizer::CIRCULAR_REFERENCE_HANDLER] ?? $this->defaultContext[AbstractNormalizer::CIRCULAR_REFERENCE_HANDLER];
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if ($circularReferenceHandler) {
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return $circularReferenceHandler($object, $format, $context);
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}
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throw new CircularReferenceException(\sprintf('A circular reference has been detected when serializing the object of class "%s" (configured limit: %d).', get_debug_type($object), $context[AbstractNormalizer::CIRCULAR_REFERENCE_LIMIT] ?? $this->defaultContext[AbstractNormalizer::CIRCULAR_REFERENCE_LIMIT]));
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}
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}

‎tests/Fixtures/TestBundle/ApiResource/Issue4358/ResourceA.php‎

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<?php
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/*
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* This file is part of the API Platform project.
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*
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* (c) Kévin Dunglas <[email protected]>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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declare(strict_types=1);
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namespace ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue4358;
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use ApiPlatform\Metadata\ApiProperty;
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use ApiPlatform\Metadata\Get;
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use Symfony\Component\Serializer\Annotation\Groups;
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use Symfony\Component\Serializer\Annotation\MaxDepth;
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#[Get(uriTemplate: 'resource_a',
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formats: ['jsonhal'],
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outputFormats: ['jsonhal'],
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normalizationContext: ['groups' => ['ResourceA:read'], 'enable_max_depth' => true],
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provider: [self::class, 'provide'])]
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final class ResourceA
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{
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private static ?ResourceA $resourceA = null;
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#[ApiProperty(readableLink: true)]
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#[Groups(['ResourceA:read', 'ResourceB:read'])]
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#[MaxDepth(6)]
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public ResourceB $b;
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public function __construct(?ResourceB $b = null)
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{
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if (null !== $b) {
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$this->b = $b;
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}
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}
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public static function provide(): self
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{
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return self::provideWithResource();
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}
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public static function provideWithResource(?ResourceB $b = null): self
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{
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if (!isset(self::$resourceA)) {
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self::$resourceA = new self($b);
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if (null === ResourceB::getInstance()) {
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self::$resourceA->b = ResourceB::provideWithResource(self::$resourceA);
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}
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}
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return self::$resourceA;
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}
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public static function getInstance(): ?self
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{
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return self::$resourceA;
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}
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}

‎tests/Fixtures/TestBundle/ApiResource/Issue4358/ResourceB.php‎

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<?php
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/*
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* This file is part of the API Platform project.
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*
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* (c) Kévin Dunglas <[email protected]>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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declare(strict_types=1);
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namespace ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue4358;
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use ApiPlatform\Metadata\ApiProperty;
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use ApiPlatform\Metadata\Get;
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use Symfony\Component\Serializer\Annotation\Groups;
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use Symfony\Component\Serializer\Annotation\MaxDepth;
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#[Get(uriTemplate: 'resource_b',
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formats: ['jsonhal'],
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outputFormats: ['jsonhal'],
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normalizationContext: ['groups' => ['ResourceB:read'], 'enable_max_depth' => true],
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provider: [self::class, 'provide'])]
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final class ResourceB
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{
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private static ?ResourceB $resourceB = null;
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#[ApiProperty(readableLink: true)]
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#[Groups(['ResourceA:read', 'ResourceB:read'])]
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#[MaxDepth(6)]
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public ResourceA $a;
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public function __construct(?ResourceA $a = null)
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{
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if (null !== $a) {
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$this->a = $a;
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}
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}
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public static function provide(): self
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{
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return self::provideWithResource();
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}
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public static function provideWithResource(?ResourceA $a = null): self
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{
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if (!isset(self::$resourceB)) {
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self::$resourceB = new self($a);
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if (null === ResourceA::getInstance()) {
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self::$resourceB->a = ResourceA::provideWithResource(self::$resourceB);
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}
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}
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return self::$resourceB;
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}
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public static function getInstance(): ?self
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{
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return self::$resourceB;
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}
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}

‎tests/Functional/HALCircularReference.php‎

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<?php
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/*
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* This file is part of the API Platform project.
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*
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* (c) Kévin Dunglas <[email protected]>
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*
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* For the full copyright and license information, please view the LICENSE
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* file that was distributed with this source code.
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*/
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declare(strict_types=1);
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namespace ApiPlatform\Tests\Functional;
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use ApiPlatform\Symfony\Bundle\Test\ApiTestCase;
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use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue4358\ResourceA;
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use ApiPlatform\Tests\Fixtures\TestBundle\ApiResource\Issue4358\ResourceB;
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use ApiPlatform\Tests\SetupClassResourcesTrait;
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class HALCircularReference extends ApiTestCase
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{
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use SetupClassResourcesTrait;
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public function testIssue4358(): void
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{
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$r1 = self::createClient()->request('GET', '/resource_a', ['headers' => ['Accept' => 'application/hal+json']]);
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self::assertResponseIsSuccessful();
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self::assertEquals('{"_links":{"self":{"href":"\/resource_a"},"b":{"href":"\/resource_b"}},"_embedded":{"b":{"_links":{"self":{"href":"\/resource_b"},"a":{"href":"\/resource_a"}},"_embedded":{"a":{"_links":{"self":{"href":"\/resource_a"}}}}}}}', $r1->getContent());
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}
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public static function getResources(): array
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{
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return [ResourceA::class, ResourceB::class];
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}
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}

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