RequestHandler.php
Same filename in other branches
Namespace
Drupal\restFile
-
core/
modules/ rest/ src/ RequestHandler.php
View source
<?php
namespace Drupal\rest;
use Drupal\Component\Utility\ArgumentsResolver;
use Drupal\Core\Cache\CacheableResponseInterface;
use Drupal\Core\DependencyInjection\ContainerInjectionInterface;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\rest\Plugin\ResourceInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\HttpKernel\Exception\BadRequestHttpException;
use Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException;
use Symfony\Component\Serializer\Exception\UnexpectedValueException;
use Symfony\Component\Serializer\Exception\InvalidArgumentException;
use Symfony\Component\Serializer\SerializerInterface;
/**
* Acts as intermediate request forwarder for resource plugins.
*
* @see \Drupal\rest\EventSubscriber\ResourceResponseSubscriber
*/
class RequestHandler implements ContainerInjectionInterface {
/**
* The serializer.
*
* @var \Symfony\Component\Serializer\SerializerInterface|\Symfony\Component\Serializer\Encoder\DecoderInterface
*/
protected $serializer;
/**
* Creates a new RequestHandler instance.
*
* @param \Symfony\Component\Serializer\SerializerInterface|\Symfony\Component\Serializer\Encoder\DecoderInterface $serializer
* The serializer.
*/
public function __construct(SerializerInterface $serializer) {
$this->serializer = $serializer;
}
/**
* {@inheritdoc}
*/
public static function create(ContainerInterface $container) {
return new static($container->get('serializer'));
}
/**
* Handles a REST API request.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match.
* @param \Symfony\Component\HttpFoundation\Request $request
* The HTTP request object.
* @param \Drupal\rest\RestResourceConfigInterface $_rest_resource_config
* The REST resource config entity.
*
* @return \Drupal\rest\ResourceResponseInterface|\Symfony\Component\HttpFoundation\Response
* The REST resource response.
*/
public function handle(RouteMatchInterface $route_match, Request $request, RestResourceConfigInterface $_rest_resource_config) {
$resource = $_rest_resource_config->getResourcePlugin();
$unserialized = $this->deserialize($route_match, $request, $resource);
$response = $this->delegateToRestResourcePlugin($route_match, $request, $unserialized, $resource);
return $this->prepareResponse($response, $_rest_resource_config);
}
/**
* Handles a REST API request without deserializing the request body.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match.
* @param \Symfony\Component\HttpFoundation\Request $request
* The HTTP request object.
* @param \Drupal\rest\RestResourceConfigInterface $_rest_resource_config
* The REST resource config entity.
*
* @return \Symfony\Component\HttpFoundation\Response|\Drupal\rest\ResourceResponseInterface
* The REST resource response.
*/
public function handleRaw(RouteMatchInterface $route_match, Request $request, RestResourceConfigInterface $_rest_resource_config) {
$resource = $_rest_resource_config->getResourcePlugin();
$response = $this->delegateToRestResourcePlugin($route_match, $request, NULL, $resource);
return $this->prepareResponse($response, $_rest_resource_config);
}
/**
* Prepares the REST resource response.
*
* @param \Drupal\rest\ResourceResponseInterface $response
* The REST resource response.
* @param \Drupal\rest\RestResourceConfigInterface $resource_config
* The REST resource config entity.
*
* @return \Drupal\rest\ResourceResponseInterface
* The prepared REST resource response.
*/
protected function prepareResponse($response, RestResourceConfigInterface $resource_config) {
if ($response instanceof CacheableResponseInterface) {
$response->addCacheableDependency($resource_config);
}
return $response;
}
/**
* Gets the normalized HTTP request method of the matched route.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match.
*
* @return string
* The normalized HTTP request method.
*/
protected static function getNormalizedRequestMethod(RouteMatchInterface $route_match) {
// Symfony is built to transparently map HEAD requests to a GET request. In
// the case of the REST module's RequestHandler though, we essentially have
// our own light-weight routing system on top of the Drupal/symfony routing
// system. So, we have to respect the decision that the routing system made:
// we look not at the request method, but at the route's method. All REST
// routes are guaranteed to have _method set.
// Response::prepare() will transform it to a HEAD response at the very last
// moment.
// @see https://www.w3.org/Protocols/rfc2616/rfc2616-sec9.html#sec9.4
// @see \Symfony\Component\Routing\Matcher\UrlMatcher::matchCollection()
// @see \Symfony\Component\HttpFoundation\Response::prepare()
$method = strtolower($route_match->getRouteObject()
->getMethods()[0]);
assert(count($route_match->getRouteObject()
->getMethods()) === 1);
return $method;
}
/**
* Deserializes request body, if any.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match.
* @param \Symfony\Component\HttpFoundation\Request $request
* The HTTP request object.
* @param \Drupal\rest\Plugin\ResourceInterface $resource
* The REST resource plugin.
*
* @return array|null
* An object normalization, ikf there is a valid request body. NULL if there
* is no request body.
*
* @throws \Symfony\Component\HttpKernel\Exception\BadRequestHttpException
* Thrown if the request body cannot be decoded.
* @throws \Symfony\Component\HttpKernel\Exception\UnprocessableEntityHttpException
* Thrown if the request body cannot be denormalized.
*/
protected function deserialize(RouteMatchInterface $route_match, Request $request, ResourceInterface $resource) {
// Deserialize incoming data if available.
$received = $request->getContent();
$unserialized = NULL;
if (!empty($received)) {
$method = static::getNormalizedRequestMethod($route_match);
$format = $request->getContentType();
$definition = $resource->getPluginDefinition();
// First decode the request data. We can then determine if the
// serialized data was malformed.
try {
$unserialized = $this->serializer
->decode($received, $format, [
'request_method' => $method,
]);
} catch (UnexpectedValueException $e) {
// If an exception was thrown at this stage, there was a problem
// decoding the data. Throw a 400 http exception.
throw new BadRequestHttpException($e->getMessage());
}
// Then attempt to denormalize if there is a serialization class.
if (!empty($definition['serialization_class'])) {
try {
$unserialized = $this->serializer
->denormalize($unserialized, $definition['serialization_class'], $format, [
'request_method' => $method,
]);
} catch (UnexpectedValueException $e) {
throw new UnprocessableEntityHttpException($e->getMessage());
} catch (InvalidArgumentException $e) {
throw new UnprocessableEntityHttpException($e->getMessage());
}
}
}
return $unserialized;
}
/**
* Delegates an incoming request to the appropriate REST resource plugin.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match.
* @param \Symfony\Component\HttpFoundation\Request $request
* The HTTP request object.
* @param mixed|null $unserialized
* The unserialized request body, if any.
* @param \Drupal\rest\Plugin\ResourceInterface $resource
* The REST resource plugin.
*
* @return \Symfony\Component\HttpFoundation\Response|\Drupal\rest\ResourceResponseInterface
* The REST resource response.
*/
protected function delegateToRestResourcePlugin(RouteMatchInterface $route_match, Request $request, $unserialized, ResourceInterface $resource) {
$method = static::getNormalizedRequestMethod($route_match);
// Determine the request parameters that should be passed to the resource
// plugin.
$argument_resolver = $this->createArgumentResolver($route_match, $unserialized, $request);
$arguments = $argument_resolver->getArguments([
$resource,
$method,
]);
// Invoke the operation on the resource plugin.
return call_user_func_array([
$resource,
$method,
], $arguments);
}
/**
* Creates an argument resolver, containing all REST parameters.
*
* @param \Drupal\Core\Routing\RouteMatchInterface $route_match
* The route match.
* @param mixed $unserialized
* The unserialized data.
* @param \Symfony\Component\HttpFoundation\Request $request
* The request.
*
* @return \Drupal\Component\Utility\ArgumentsResolver
* An instance of the argument resolver containing information like the
* 'entity' we process and the 'unserialized' content from the request body.
*/
protected function createArgumentResolver(RouteMatchInterface $route_match, $unserialized, Request $request) {
$route = $route_match->getRouteObject();
// Defaults for the parameters defined on the route object need to be added
// to the raw arguments.
$raw_route_arguments = $route_match->getRawParameters()
->all() + $route->getDefaults();
$route_arguments = $route_match->getParameters()
->all();
$upcasted_route_arguments = $route_arguments;
// For request methods that have request bodies, ResourceInterface plugin
// methods historically receive the unserialized request body as the N+1th
// method argument, where N is the number of route parameters specified on
// the accompanying route. To be able to use the argument resolver, which is
// not based on position but on name and typehint, specify commonly used
// names here. Similarly, those methods receive the original stored object
// as the first method argument.
$route_arguments_entity = NULL;
// Try to find a parameter which is an entity.
foreach ($route_arguments as $value) {
if ($value instanceof EntityInterface) {
$route_arguments_entity = $value;
break;
}
}
if (in_array($request->getMethod(), [
'PATCH',
'POST',
], TRUE)) {
if (is_object($unserialized)) {
$upcasted_route_arguments['entity'] = $unserialized;
$upcasted_route_arguments['data'] = $unserialized;
$upcasted_route_arguments['unserialized'] = $unserialized;
}
else {
$raw_route_arguments['data'] = $unserialized;
$raw_route_arguments['unserialized'] = $unserialized;
}
$upcasted_route_arguments['original_entity'] = $route_arguments_entity;
}
else {
$upcasted_route_arguments['entity'] = $route_arguments_entity;
}
// Parameters which are not defined on the route object, but still are
// essential for access checking are passed as wildcards to the argument
// resolver.
$wildcard_arguments = [
$route,
$route_match,
];
$wildcard_arguments[] = $request;
if (isset($unserialized)) {
$wildcard_arguments[] = $unserialized;
}
return new ArgumentsResolver($raw_route_arguments, $upcasted_route_arguments, $wildcard_arguments);
}
}
Classes
Title | Deprecated | Summary |
---|---|---|
RequestHandler | Acts as intermediate request forwarder for resource plugins. |
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