--- /dev/null
+<?php
+
+namespace Drupal\Core\Controller;
+
+use Drupal\Core\DependencyInjection\ClassResolverInterface;
+use Drupal\Core\Routing\RouteMatch;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Psr\Http\Message\ServerRequestInterface;
+use Symfony\Bridge\PsrHttpMessage\HttpMessageFactoryInterface;
+use Symfony\Component\HttpFoundation\Request;
+use Symfony\Component\HttpKernel\Controller\ControllerResolver as BaseControllerResolver;
+
+/**
+ * ControllerResolver to enhance controllers beyond Symfony's basic handling.
+ *
+ * It adds two behaviors:
+ *
+ * - When creating a new object-based controller that implements
+ * ContainerAwareInterface, inject the container into it. While not always
+ * necessary, that allows a controller to vary the services it needs at
+ * runtime.
+ *
+ * - By default, a controller name follows the class::method notation. This
+ * class adds the possibility to use a service from the container as a
+ * controller by using a service:method notation (Symfony uses the same
+ * convention).
+ */
+class ControllerResolver extends BaseControllerResolver implements ControllerResolverInterface {
+
+ /**
+ * The class resolver.
+ *
+ * @var \Drupal\Core\DependencyInjection\ClassResolverInterface
+ */
+ protected $classResolver;
+
+ /**
+ * The PSR-7 converter.
+ *
+ * @var \Symfony\Bridge\PsrHttpMessage\HttpMessageFactoryInterface
+ */
+ protected $httpMessageFactory;
+
+ /**
+ * Constructs a new ControllerResolver.
+ *
+ * @param \Symfony\Bridge\PsrHttpMessage\HttpMessageFactoryInterface $http_message_factory
+ * The PSR-7 converter.
+ * @param \Drupal\Core\DependencyInjection\ClassResolverInterface $class_resolver
+ * The class resolver.
+ */
+ public function __construct(HttpMessageFactoryInterface $http_message_factory, ClassResolverInterface $class_resolver) {
+ $this->httpMessageFactory = $http_message_factory;
+ $this->classResolver = $class_resolver;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getControllerFromDefinition($controller, $path = '') {
+ if (is_array($controller) || (is_object($controller) && method_exists($controller, '__invoke'))) {
+ return $controller;
+ }
+
+ if (strpos($controller, ':') === FALSE) {
+ if (function_exists($controller)) {
+ return $controller;
+ }
+ elseif (method_exists($controller, '__invoke')) {
+ return new $controller();
+ }
+ }
+
+ $callable = $this->createController($controller);
+
+ if (!is_callable($callable)) {
+ throw new \InvalidArgumentException(sprintf('The controller for URI "%s" is not callable.', $path));
+ }
+
+ return $callable;
+ }
+
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getController(Request $request) {
+ if (!$controller = $request->attributes->get('_controller')) {
+ return FALSE;
+ }
+ return $this->getControllerFromDefinition($controller, $request->getPathInfo());
+ }
+
+ /**
+ * Returns a callable for the given controller.
+ *
+ * @param string $controller
+ * A Controller string.
+ *
+ * @return mixed
+ * A PHP callable.
+ *
+ * @throws \LogicException
+ * If the controller cannot be parsed.
+ *
+ * @throws \InvalidArgumentException
+ * If the controller class does not exist.
+ */
+ protected function createController($controller) {
+ // Controller in the service:method notation.
+ $count = substr_count($controller, ':');
+ if ($count == 1) {
+ list($class_or_service, $method) = explode(':', $controller, 2);
+ }
+ // Controller in the class::method notation.
+ elseif (strpos($controller, '::') !== FALSE) {
+ list($class_or_service, $method) = explode('::', $controller, 2);
+ }
+ else {
+ throw new \LogicException(sprintf('Unable to parse the controller name "%s".', $controller));
+ }
+
+ $controller = $this->classResolver->getInstanceFromDefinition($class_or_service);
+
+ return [$controller, $method];
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ protected function doGetArguments(Request $request, $controller, array $parameters) {
+ $attributes = $request->attributes->all();
+ $raw_parameters = $request->attributes->has('_raw_variables') ? $request->attributes->get('_raw_variables') : [];
+ $arguments = [];
+ foreach ($parameters as $param) {
+ if (array_key_exists($param->name, $attributes)) {
+ $arguments[] = $attributes[$param->name];
+ }
+ elseif (array_key_exists($param->name, $raw_parameters)) {
+ $arguments[] = $attributes[$param->name];
+ }
+ elseif ($param->getClass() && $param->getClass()->isInstance($request)) {
+ $arguments[] = $request;
+ }
+ elseif ($param->getClass() && $param->getClass()->name === ServerRequestInterface::class) {
+ $arguments[] = $this->httpMessageFactory->createRequest($request);
+ }
+ elseif ($param->getClass() && ($param->getClass()->name == RouteMatchInterface::class || is_subclass_of($param->getClass()->name, RouteMatchInterface::class))) {
+ $arguments[] = RouteMatch::createFromRequest($request);
+ }
+ elseif ($param->isDefaultValueAvailable()) {
+ $arguments[] = $param->getDefaultValue();
+ }
+ else {
+ if (is_array($controller)) {
+ $repr = sprintf('%s::%s()', get_class($controller[0]), $controller[1]);
+ }
+ elseif (is_object($controller)) {
+ $repr = get_class($controller);
+ }
+ else {
+ $repr = $controller;
+ }
+
+ throw new \RuntimeException(sprintf('Controller "%s" requires that you provide a value for the "$%s" argument (because there is no default value or because there is a non optional argument after this one).', $repr, $param->name));
+ }
+ }
+ return $arguments;
+ }
+
+}
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