Switch to a new UrlMatcher and RouterListener so that we can use a full Request object for routing purposes, and look to the attributes for our main routing information.

core/lib/Drupal/Core/DrupalKernel.php

@@ -17,7 +17,7 @@ use Symfony\Component\EventDispatcher\EventDispatcherInterface;
 use Symfony\Component\EventDispatcher\Event;
 use Symfony\Component\HttpKernel\Controller\ControllerResolverInterface;
 use Symfony\Component\HttpKernel\Event\GetResponseForExceptionEvent;
-use Symfony\Component\HttpKernel\EventListener\RouterListener;
+//use Symfony\Component\HttpKernel\EventListener\RouterListener;
 use Symfony\Component\HttpKernel\EventListener\ExceptionListener;
 use Drupal\Core\EventSubscriber\ViewSubscriber;
 use Drupal\Core\EventSubscriber\AccessSubscriber;
@@ -25,6 +25,7 @@ use Drupal\Core\EventSubscriber\PathSubscriber;
 use Drupal\Core\EventSubscriber\LegacyControllerSubscriber;
 use Drupal\Core\EventSubscriber\MaintenanceModeSubscriber;
 use Drupal\Core\EventSubscriber\RequestCloseSubscriber;
+use Drupal\Core\EventSubscriber\RouterListener;
 
 use Exception;
 
@@ -61,8 +62,7 @@ class DrupalKernel extends HttpKernel {
       $this->dispatcher = $dispatcher;
       $this->resolver = $resolver;
 
-      $context = new RequestContext();
-      $this->matcher = new UrlMatcher($context);
+      $this->matcher = new UrlMatcher();
       $this->dispatcher->addSubscriber(new RouterListener($this->matcher));
 
       $negotiation = new ContentNegotiation();

core/lib/Drupal/Core/EventSubscriber/RouterListener.php

@@ -0,0 +1,28 @@
+<?php
+
+namespace Drupal\Core\EventSubscriber;
+
+use Symfony\Component\HttpKernel\EventListener\RouterListener as SymfonyRouterListener;
+use Symfony\Component\HttpKernel\Event\GetResponseEvent;
+use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
+
+/**
+ * Description of RouterListener
+ *
+ * @author crell
+ */
+class RouterListener extends SymfonyRouterListener {
+
+  protected $urlMatcher;
+
+  public function __construct(UrlMatcherInterface $urlMatcher, LoggerInterface $logger = null) {
+    parent::__construct($urlMatcher, $logger);
+    $this->urlMatcher = $urlMatcher;
+  }
+
+  public function onKernelRequest(GetResponseEvent $event) {
+    $this->urlMatcher->setRequest($event->getRequest());
+    parent::onKernelRequest($event);
+  }
+
+}

core/lib/Drupal/Core/UrlMatcher.php

@@ -8,8 +8,10 @@
 
 namespace Drupal\Core;
 
+use Symfony\Component\HttpFoundation\Request;
 use Symfony\Component\Routing\Exception\MethodNotAllowedException;
 use Symfony\Component\Routing\Exception\ResourceNotFoundException;
+use Symfony\Component\Routing\Matcher\UrlMatcherInterface;
 use Symfony\Component\Routing\Matcher\UrlMatcher as SymfonyUrlMatcher;
 use Symfony\Component\Routing\RequestContext;
 use Symfony\Component\Routing\Route;
@@ -18,7 +20,7 @@ use Symfony\Component\Routing\RouteCollection;
 /**
  * UrlMatcher matches URL based on a set of routes.
  */
-class UrlMatcher extends SymfonyUrlMatcher {
+class UrlMatcher implements UrlMatcherInterface {
 
   /**
    * The request context for this matcher.
@@ -28,15 +30,56 @@ class UrlMatcher extends SymfonyUrlMatcher {
   protected $context;
 
   /**
-   * Constructor.
+   * The request object for this matcher.
    *
-   * @param RequestContext  $context
-   *   The request context object.
+   * @var Symfony\Component\HttpFoundation\Request
    */
-  public function __construct(RequestContext $context) {
+  protected $request;
+
+  public function __construct() {
+    // We will not actually use this object, but it's needed to conform to
+    // the interface.
+    $this->context = new RequestContext();
+  }
+
+  /**
+   * Sets the request context.
+   *
+   * This method is just to satisfy the interface, and is largely vestigial.
+   * The request context object does not contain the information we need, so
+   * we will use the original request object.
+   *
+   * @param RequestContext $context
+   *   The context
+   *
+   * @api
+   */
+  public function setContext(RequestContext $context) {
     $this->context = $context;
   }
 
+  /**
+   * Gets the request context.
+   *
+   * This method is just to satisfy the interface, and is largely vestigial.
+   * The request context object does not contain the information we need, so
+   * we will use the original request object.
+   *
+   * @return RequestContext
+   *   The context
+   */
+  public function getContext() {
+    return $this->context;
+  }
+
+  public function setRequest(Request $request) {
+    $this->request = $request;
+  }
+
+  public function getRequest() {
+    return $this->request;
+  }
+
   /**
    * {@inheritDoc}
    *
@@ -44,15 +87,16 @@ class UrlMatcher extends SymfonyUrlMatcher {
    */
   public function match($pathinfo) {
 
-    $this->allow = array();
+    $dpathinfo = $this->request->attributes->get('system_path');
 
-    // Symfony uses a prefixing / but we don't yet.
-    $dpathinfo = ltrim($pathinfo, '/');
+    if (!$dpathinfo) {
+      // Symfony uses a prefixing / but we don't yet.
+      $dpathinfo = ltrim($pathinfo, '/');
+    }
 
     // Do our fancy frontpage logic.
     if (empty($dpathinfo)) {
       $dpathinfo = variable_get('site_frontpage', 'user');
-      $pathinfo = '/' . $dpathinfo;
     }
 
     if ($router_item = $this->matchDrupalItem($dpathinfo)) {