allow broadcast on demand notifications

Author: taylorotwell

src/Illuminate/Notifications/Events/BroadcastNotificationCreated.php

@@ -5,7 +5,9 @@
 use Illuminate\Broadcasting\PrivateChannel;
 use Illuminate\Bus\Queueable;
 use Illuminate\Contracts\Broadcasting\ShouldBroadcast;
+use Illuminate\Notifications\AnonymousNotifiable;
 use Illuminate\Queue\SerializesModels;
+use Illuminate\Support\Arr;
 
 class BroadcastNotificationCreated implements ShouldBroadcast
 {
@@ -54,7 +56,12 @@ public function __construct($notifiable, $notification, $data)
      */
     public function broadcastOn()
     {
-        $channels = $this->notification->broadcastOn();
+        if ($this->notifiable instanceof AnonymousNotifiable &&
+            $this->notifiable->routeNotificationFor('broadcast')) {
+            $channels = Arr::wrap($this->notifiable->routeNotificationFor('broadcast'));
+        } else {
+            $channels = $this->notification->broadcastOn();
+        }
 
         if (! empty($channels)) {
             return $channels;