diff core/lib/Drupal/Core/EventSubscriber/SpecialAttributesRouteSubscriber.php @ 0:4c8ae668cc8c

Initial import (non-working)

--- /dev/null	Thu Jan 01 00:00:00 1970 +0000
+++ b/core/lib/Drupal/Core/EventSubscriber/SpecialAttributesRouteSubscriber.php	Wed Nov 29 16:09:58 2017 +0000
@@ -0,0 +1,48 @@
+<?php
+
+namespace Drupal\Core\EventSubscriber;
+
+use Drupal\Core\Routing\RouteBuildEvent;
+use Drupal\Core\Routing\RouteSubscriberBase;
+use Symfony\Cmf\Component\Routing\RouteObjectInterface;
+use Symfony\Component\Routing\RouteCollection;
+
+/**
+ * Provides a route subscriber which checks for invalid pattern variables.
+ */
+class SpecialAttributesRouteSubscriber extends RouteSubscriberBase {
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function alterRoutes(RouteCollection $collection) {
+    $special_variables = [
+      'system_path',
+      '_legacy',
+      '_raw_variables',
+      RouteObjectInterface::ROUTE_OBJECT,
+      RouteObjectInterface::ROUTE_NAME,
+      '_content',
+      '_controller',
+      '_form',
+    ];
+    foreach ($collection->all() as $name => $route) {
+      if ($not_allowed_variables = array_intersect($route->compile()->getVariables(), $special_variables)) {
+        $reserved = implode(', ', $not_allowed_variables);
+        trigger_error(sprintf('Route %s uses reserved variable names: %s', $name, $reserved), E_USER_WARNING);
+      }
+    }
+  }
+
+  /**
+   * Delegates the route altering to self::alterRoutes().
+   *
+   * @param \Drupal\Core\Routing\RouteBuildEvent $event
+   *   The route build event.
+   */
+  public function onAlterRoutes(RouteBuildEvent $event) {
+    $collection = $event->getRouteCollection();
+    $this->alterRoutes($collection);
+  }
+
+}