class ResourceResponseValidator in Drupal 8

Response subscriber that validates a JSON:API response.

This must run after ResourceResponseSubscriber.

@internal JSON:API maintains no PHP API. The API is the HTTP API. This class may change at any time and could break any dependencies on it.

Hierarchy

• class \Drupal\jsonapi\EventSubscriber\ResourceResponseValidator implements \Symfony\Component\EventDispatcher\EventSubscriberInterface

See also

https://www.drupal.org/project/drupal/issues/3032787

jsonapi.api.php

\Drupal\rest\EventSubscriber\ResourceResponseSubscriber

1 file declares its use of ResourceResponseValidator

ResourceResponseValidatorTest.php in core/modules/jsonapi/tests/src/Unit/EventSubscriber/ResourceResponseValidatorTest.php

1 string reference to 'ResourceResponseValidator'

jsonapi.services.yml in core/modules/jsonapi/jsonapi.services.yml

core/modules/jsonapi/jsonapi.services.yml

1 service uses ResourceResponseValidator

jsonapi.resource_response_validator.subscriber in core/modules/jsonapi/jsonapi.services.yml

Drupal\jsonapi\EventSubscriber\ResourceResponseValidator

File

core/modules/jsonapi/src/EventSubscriber/ResourceResponseValidator.php, line 28

Namespace

Drupal\jsonapi\EventSubscriber

class ResourceResponseValidator implements EventSubscriberInterface {

  /**
   * The JSON:API logger channel.
   *
   * @var \Psr\Log\LoggerInterface
   */
  protected $logger;

  /**
   * The schema validator.
   *
   * This property will only be set if the validator library is available.
   *
   * @var \JsonSchema\Validator|null
   */
  protected $validator;

  /**
   * The module handler.
   *
   * @var \Drupal\Core\Extension\ModuleHandlerInterface
   */
  protected $moduleHandler;

  /**
   * The application's root file path.
   *
   * @var string
   */
  protected $appRoot;

  /**
   * Constructs a ResourceResponseValidator object.
   *
   * @param \Psr\Log\LoggerInterface $logger
   *   The JSON:API logger channel.
   * @param \Drupal\Core\Extension\ModuleHandlerInterface $module_handler
   *   The module handler.
   * @param string $app_root
   *   The application's root file path.
   */
  public function __construct(LoggerInterface $logger, ModuleHandlerInterface $module_handler, $app_root) {
    $this->logger = $logger;
    $this->moduleHandler = $module_handler;
    $this->appRoot = $app_root;
  }

  /**
   * {@inheritdoc}
   */
  public static function getSubscribedEvents() {
    $events[KernelEvents::RESPONSE][] = [
      'onResponse',
    ];
    return $events;
  }

  /**
   * Sets the validator service if available.
   */
  public function setValidator(Validator $validator = NULL) {
    if ($validator) {
      $this->validator = $validator;
    }
    elseif (class_exists(Validator::class)) {
      $this->validator = new Validator();
    }
  }

  /**
   * Validates JSON:API responses.
   *
   * @param \Symfony\Component\HttpKernel\Event\FilterResponseEvent $event
   *   The event to process.
   */
  public function onResponse(FilterResponseEvent $event) {
    $response = $event
      ->getResponse();
    if (strpos($response->headers
      ->get('Content-Type'), 'application/vnd.api+json') === FALSE) {
      return;
    }
    $this
      ->doValidateResponse($response, $event
      ->getRequest());
  }

  /**
   * Wraps validation in an assert to prevent execution in production.
   *
   * @see self::validateResponse
   */
  public function doValidateResponse(Response $response, Request $request) {
    assert($this
      ->validateResponse($response, $request), 'A JSON:API response failed validation (see the logs for details). Please report this in the issue queue on drupal.org');
  }

  /**
   * Validates a response against the JSON:API specification.
   *
   * @param \Symfony\Component\HttpFoundation\Response $response
   *   The response to validate.
   * @param \Symfony\Component\HttpFoundation\Request $request
   *   The request containing info about what to validate.
   *
   * @return bool
   *   FALSE if the response failed validation, otherwise TRUE.
   */
  protected function validateResponse(Response $response, Request $request) {

    // If the validator isn't set, then the validation library is not installed.
    if (!$this->validator) {
      return TRUE;
    }

    // Do not use Json::decode here since it coerces the response into an
    // associative array, which creates validation errors.
    $response_data = json_decode($response
      ->getContent());
    if (empty($response_data)) {
      return TRUE;
    }
    $schema_ref = sprintf('file://%s/schema.json', implode('/', [
      $this->appRoot,
      $this->moduleHandler
        ->getModule('jsonapi')
        ->getPath(),
    ]));
    $generic_jsonapi_schema = (object) [
      '$ref' => $schema_ref,
    ];
    return $this
      ->validateSchema($generic_jsonapi_schema, $response_data);
  }

  /**
   * Validates a string against a JSON Schema. It logs any possible errors.
   *
   * @param object $schema
   *   The JSON Schema object.
   * @param string $response_data
   *   The JSON string to validate.
   *
   * @return bool
   *   TRUE if the string is a valid instance of the schema. FALSE otherwise.
   */
  protected function validateSchema($schema, $response_data) {
    $this->validator
      ->check($response_data, $schema);
    $is_valid = $this->validator
      ->isValid();
    if (!$is_valid) {
      $this->logger
        ->debug("Response failed validation.\nResponse:\n@data\n\nErrors:\n@errors", [
        '@data' => Json::encode($response_data),
        '@errors' => Json::encode($this->validator
          ->getErrors()),
      ]);
    }
    return $is_valid;
  }

}

Members

Name	Modifiers	Type	Description	Overrides
ResourceResponseValidator::$appRoot	protected	property	The application's root file path.
ResourceResponseValidator::$logger	protected	property	The JSON:API logger channel.
ResourceResponseValidator::$moduleHandler	protected	property	The module handler.
ResourceResponseValidator::$validator	protected	property	The schema validator.
ResourceResponseValidator::doValidateResponse	public	function	Wraps validation in an assert to prevent execution in production.
ResourceResponseValidator::getSubscribedEvents	public static	function	Returns an array of event names this subscriber wants to listen to.
ResourceResponseValidator::onResponse	public	function	Validates JSON:API responses.
ResourceResponseValidator::setValidator	public	function	Sets the validator service if available.
ResourceResponseValidator::validateResponse	protected	function	Validates a response against the JSON:API specification.
ResourceResponseValidator::validateSchema	protected	function	Validates a string against a JSON Schema. It logs any possible errors.
ResourceResponseValidator::__construct	public	function	Constructs a ResourceResponseValidator object.