diff core/modules/jsonapi/src/EventSubscriber/ResourceResponseValidator.php @ 5:12f9dff5fda9 tip

Update to Drupal core 8.7.1

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/modules/jsonapi/src/EventSubscriber/ResourceResponseValidator.php	Thu May 09 15:34:47 2019 +0100
@@ -0,0 +1,192 @@
+<?php
+
+namespace Drupal\jsonapi\EventSubscriber;
+
+use Drupal\Component\Serialization\Json;
+use Drupal\Core\Extension\ModuleHandlerInterface;
+use JsonSchema\Validator;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\EventDispatcher\EventSubscriberInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpFoundation\Response;
+use Symfony\Component\HttpKernel\Event\FilterResponseEvent;
+use Symfony\Component\HttpKernel\KernelEvents;
+use Symfony\Component\Serializer\SerializerInterface;
+
+/**
+ * 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.
+ *
+ * @see https://www.drupal.org/project/jsonapi/issues/3032787
+ * @see jsonapi.api.php
+ *
+ * @see \Drupal\rest\EventSubscriber\ResourceResponseSubscriber
+ */
+class ResourceResponseValidator implements EventSubscriberInterface {
+
+  /**
+   * The serializer.
+   *
+   * @var \Symfony\Component\Serializer\SerializerInterface
+   */
+  protected $serializer;
+
+  /**
+   * 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 \Symfony\Component\Serializer\SerializerInterface $serializer
+   *   The serializer.
+   * @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(SerializerInterface $serializer, LoggerInterface $logger, ModuleHandlerInterface $module_handler, $app_root) {
+    $this->serializer = $serializer;
+    $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 $request) {
+    if (PHP_MAJOR_VERSION >= 7 || assert_options(ASSERT_ACTIVE)) {
+      assert($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;
+  }
+
+}