/**
  * Handle the subscribe subscriber command.
  *
  * @param \CachetHQ\Cachet\Bus\Commands\Subscriber\SubscribeSubscriberCommand $command
  *
  * @return \CachetHQ\Cachet\Models\Subscriber
  */
 public function handle(SubscribeSubscriberCommand $command)
 {
     if ($subscriber = Subscriber::where('email', $command->email)->first()) {
         return $subscriber;
     }
     $subscriber = Subscriber::firstOrCreate(['email' => $command->email]);
     // Decide what to subscribe the subscriber to.
     if ($subscriptions = $command->subscriptions) {
         $subscriptions = Component::whereIn('id', $subscriptions);
     } else {
         $subscriptions = Component::all();
     }
     foreach ($subscriptions as $component) {
         Subscription::create(['subscriber_id' => $subscriber->id, 'component_id' => $component->id]);
     }
     if ($command->verified) {
         dispatch(new VerifySubscriberCommand($subscriber));
     } else {
         event(new SubscriberHasSubscribedEvent($subscriber));
     }
     return $subscriber;
 }