Redirector can redirect

config/config.yaml

@@ -1,4 +1,10 @@
 # Reference extension configuration file
 
-redirects:
-  foo: bar
+#redirects:
+#  from: to
+#
+# from can be the full URI or the absolute path,
+# e.g. https://example.org/page/about or /page/about
+#
+# "https://example.org/page/about: "/page/about-us"
+# "/page/mission": "/page/our-mission"

config/routes.yaml

@@ -1,4 +0,0 @@
-
-reference_extension:
-  resource: '../../vendor/acmecorp/reference-extension/src/Controller/'
-  type: annotation

src/RedirectSubscriber.php

@@ -7,12 +7,20 @@
 use Bolt\Widget\Injector\RequestZone;
 use Symfony\Component\EventDispatcher\EventSubscriberInterface;
 use Symfony\Component\HttpFoundation\RedirectResponse;
-use Symfony\Component\HttpKernel\Event\RequestEvent;
+use Symfony\Component\HttpKernel\Event\ResponseEvent;
 use Symfony\Component\HttpKernel\KernelEvents;
 
 class RedirectSubscriber implements EventSubscriberInterface
 {
-    public function onKernelRequest(RequestEvent $event): void
+    /** @var Redirector */
+    private $redirector;
+
+    public function __construct(Redirector $redirector)
+    {
+        $this->redirector = $redirector;
+    }
+
+    public function onKernelResponse(ResponseEvent $event): void
     {
         $request = $event->getRequest();
 
@@ -25,6 +33,7 @@ public function onKernelRequest(RequestEvent $event): void
             $request->getPathInfo()
         ];
 
+
         $redirect = $this->redirector->findFor($locations);
 
         if ($redirect) {
@@ -34,8 +43,10 @@ public function onKernelRequest(RequestEvent $event): void
 
     public static function getSubscribedEvents()
     {
+        // todo: If we can get the config from Bolt in the request,
+        // let's listen to that instead, because it's faster.
         return [
-            KernelEvents::REQUEST => [['onKernelRequest', 20]]
+            KernelEvents::RESPONSE => [['onKernelResponse', 0]]
         ];
     }
 }

src/Redirector.php

@@ -14,8 +14,13 @@ public function __construct(Config $config)
 
     public function findFor(array $locations): ?string
     {
-        $redirects = array_intersect_key($locations, $this->config->getRedirects());
+        $redirects = $this->config->getRedirects();
+        $redirectKey = current(array_intersect($locations, array_keys($redirects)));
 
-        return current($redirects) ?? null;
+        if ($redirectKey) {
+            return $this->config->getRedirects()[$redirectKey];
+        }
+
+        return null;
     }
 }