JsonApiRequestValidator.php in Drupal 8

Namespace

Drupal\jsonapi\EventSubscriber

File

core/modules/jsonapi/src/EventSubscriber/JsonApiRequestValidator.php

<?php

namespace Drupal\jsonapi\EventSubscriber;

use Drupal\Core\Cache\CacheableMetadata;
use Drupal\jsonapi\JsonApiSpec;
use Symfony\Component\EventDispatcher\EventSubscriberInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Event\GetResponseEvent;
use Drupal\Core\Http\Exception\CacheableBadRequestHttpException;
use Symfony\Component\HttpKernel\KernelEvents;

/**
 * Request subscriber that validates a JSON:API request.
 *
 * @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.
 *
 * @see https://www.drupal.org/project/drupal/issues/3032787
 * @see jsonapi.api.php
 */
class JsonApiRequestValidator implements EventSubscriberInterface {

  /**
   * Validates JSON:API requests.
   *
   * @param \Symfony\Component\HttpKernel\Event\GetResponseEvent $event
   *   The event to process.
   */
  public function onRequest(GetResponseEvent $event) {
    $request = $event
      ->getRequest();
    if ($request
      ->getRequestFormat() !== 'api_json') {
      return;
    }
    $this
      ->validateQueryParams($request);
  }

  /**
   * Validates custom (implementation-specific) query parameter names.
   *
   * @param \Symfony\Component\HttpFoundation\Request $request
   *   The request for which to validate JSON:API query parameters.
   *
   * @return \Drupal\jsonapi\ResourceResponse|null
   *   A JSON:API resource response.
   *
   * @see http://jsonapi.org/format/#query-parameters
   */
  protected function validateQueryParams(Request $request) {
    $invalid_query_params = [];
    foreach (array_keys($request->query
      ->all()) as $query_parameter_name) {

      // Ignore reserved (official) query parameters.
      if (in_array($query_parameter_name, JsonApiSpec::getReservedQueryParameters())) {
        continue;
      }
      if (!JsonApiSpec::isValidCustomQueryParameter($query_parameter_name)) {
        $invalid_query_params[] = $query_parameter_name;
      }
    }

    // Drupal uses the `_format` query parameter for Content-Type negotiation.
    // Using it violates the JSON:API spec. Nudge people nicely in the correct
    // direction. (This is special cased because using it is pretty common.)
    if (in_array('_format', $invalid_query_params, TRUE)) {
      $uri_without_query_string = $request
        ->getSchemeAndHttpHost() . $request
        ->getBaseUrl() . $request
        ->getPathInfo();
      $exception = new CacheableBadRequestHttpException((new CacheableMetadata())
        ->addCacheContexts([
        'url.query_args:_format',
      ]), 'JSON:API does not need that ugly \'_format\' query string! 🤘 Use the URL provided in \'links\' 🙏');
      $exception
        ->setHeaders([
        'Link' => $uri_without_query_string,
      ]);
      throw $exception;
    }
    if (empty($invalid_query_params)) {
      return NULL;
    }
    $message = sprintf('The following query parameters violate the JSON:API spec: \'%s\'.', implode("', '", $invalid_query_params));
    $exception = new CacheableBadRequestHttpException((new CacheableMetadata())
      ->addCacheContexts([
      'url.query_args',
    ]), $message);
    $exception
      ->setHeaders([
      'Link' => 'http://jsonapi.org/format/#query-parameters',
    ]);
    throw $exception;
  }

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

}

Classes

Name	Description
JsonApiRequestValidator	Request subscriber that validates a JSON:API request.