Handle FCM push on update news feed

[KeithYokoma]

Overview (Required)

• Handle push notification using FCM triggered by news feed update.
• Visual may change because this comes from my idea!

Changes

• Added FCM push handler service using Firebase SDK
• Abstraction for push handler logic
  • MessageClassifier gives corresponding push message handler to a "from" property in remote message
  • If RemoteMessage comes from news feed update, it returns NewPostProcessor
  • If no corresponding processor found for it, it falls back to DefaultProcessor

Screenshot

[KeithYokoma]

Additional Note:

1. Push will not come until a feed is published.
2. DroidKaigi app can receive and show notification even if it is in the background.

[KeithYokoma]

After this is merged, I will work on deploying firebase functions to prod env.

[takahirom]

Probably we should call createNotificationChannel for Android O 👀 You can use NotificationHelper. Please read it 🙏 https://github.com/droidkaigi/conference-app-2018/blob/6ccbfbb5a865968d4895037d8dd44839cab9e39c/app/src/main/java/io/github/droidkaigi/confsched2018/presentation/common/notification/NotificationHelper.kt#L17-L17

[KeithYokoma]

Got it!

[takahirom]

Thanks! Almost LGTM 👍

[KeithYokoma]

Resolving conflicts now!

[takahirom]

🙏

[takahirom]

LGTM 👍 🔔