Change Notification to not notify PubSup if none is configured.

Author: Potherca

solid/lib/Controller/SolidWebsocketController.php

@@ -14,7 +14,9 @@ class SolidWebsocketController extends Controller
      */
     public function register(): DataResponse
     {
+        // @FIXME: If there is no PUBSUB_URL what should be returned? 404? 500? Yo'mamma? 2023/01/27/BMP
         $pubsub = getenv("PUBSUB_URL") ?: "http://pubsub:8080";
+
         return new DataResponse([
             "@context" => "https://www.w3.org/ns/solid/notification/v1",
             "type" => "WebSocketSubscription2021",

solid/lib/Notifications/SolidNotifications.php

@@ -9,11 +9,18 @@ class SolidNotifications implements SolidNotificationsInterface
     {
         private $notifications;
         public function __construct() {
-            $pubsub = getenv("PUBSUB_URL") ?: "http://pubsub:8080";
-            $this->notifications = [
-            	new SolidWebhook(),
-            	new SolidPubSub($pubsub)
-	        ];
+
+            $notifications = [
+                new SolidWebhook(),
+            ];
+
+            $pubsub = getenv('PUBSUB_URL');
+
+            if ($pubsub) {
+                $notifications[] = new SolidPubSub($pubsub);
+            }
+
+            $this->notifications = $notifications;
         }
 
         public function send($path, $type) {