Migrates to Encrypted Push Notifications

app/src/play/java/com/vitorpamplona/amethyst/service/notifications/PushNotificationReceiverService.kt

@@ -1,6 +1,7 @@
 package com.vitorpamplona.amethyst.service.notifications
 
 import android.app.NotificationManager
+import android.util.LruCache
 import androidx.core.content.ContextCompat
 import com.google.firebase.messaging.FirebaseMessagingService
 import com.google.firebase.messaging.RemoteMessage
@@ -8,6 +9,7 @@ import com.vitorpamplona.amethyst.LocalPreferences
 import com.vitorpamplona.amethyst.service.notifications.NotificationUtils.getOrCreateDMChannel
 import com.vitorpamplona.amethyst.service.notifications.NotificationUtils.getOrCreateZapChannel
 import com.vitorpamplona.quartz.events.Event
+import com.vitorpamplona.quartz.events.GiftWrapEvent
 import kotlinx.coroutines.CoroutineScope
 import kotlinx.coroutines.Dispatchers
 import kotlinx.coroutines.SupervisorJob
@@ -15,19 +17,34 @@ import kotlinx.coroutines.cancel
 import kotlinx.coroutines.launch
 
 class PushNotificationReceiverService : FirebaseMessagingService() {
-    val scope = CoroutineScope(Dispatchers.IO + SupervisorJob())
+    private val scope = CoroutineScope(Dispatchers.IO + SupervisorJob())
+    private val eventCache = LruCache<String, String>(100)
 
     // this is called when a message is received
     override fun onMessageReceived(remoteMessage: RemoteMessage) {
         scope.launch(Dispatchers.IO) {
-            remoteMessage.data.let {
-                val eventStr = remoteMessage.data["event"] ?: return@let
-                val event = Event.fromJson(eventStr)
-                EventNotificationConsumer(applicationContext).consume(event)
+            parseMessage(remoteMessage.data)?.let {
+                receiveIfNew(it)
             }
         }
     }
 
+    private suspend fun parseMessage(params: Map<String, String>): GiftWrapEvent? {
+        params["encryptedEvent"]?.let { eventStr ->
+            (Event.fromJson(eventStr) as? GiftWrapEvent)?.let {
+                return it
+            }
+        }
+        return null
+    }
+
+    private suspend fun receiveIfNew(event: GiftWrapEvent) {
+        if (eventCache.get(event.id) == null) {
+            eventCache.put(event.id, event.id)
+            EventNotificationConsumer(applicationContext).consume(event)
+        }
+    }
+
     override fun onDestroy() {
         scope.cancel()
         super.onDestroy()