Add support for Push notifications

apps/multiplatform/android/src/main/AndroidManifest.xml

@@ -186,6 +186,13 @@
         android:foregroundServiceType="mediaPlayback|microphone|camera|remoteMessaging"
     />
 
+    <service android:name=".PushService"
+      android:exported="false">
+      <intent-filter>
+        <action android:name="org.unifiedpush.android.connector.PUSH_EVENT"/>
+      </intent-filter>
+    </service>
+
     <receiver
         android:name=".CallService$CallActionReceiver"
         android:enabled="true"

apps/multiplatform/android/src/main/java/chat/simplex/app/PushService.kt

@@ -0,0 +1,82 @@
+package chat.simplex.app
+
+import chat.simplex.common.model.CC
+import chat.simplex.common.platform.Log
+import chat.simplex.common.platform.chatModel
+import kotlinx.coroutines.*
+import kotlinx.serialization.Serializable
+import kotlinx.serialization.json.Json
+import org.unifiedpush.android.connector.FailedReason
+import org.unifiedpush.android.connector.PushService
+import org.unifiedpush.android.connector.data.PushEndpoint
+import org.unifiedpush.android.connector.data.PushMessage
+
+class PushService: PushService() {
+  private val json = Json {
+    ignoreUnknownKeys = true
+  }
+
+  @Serializable
+  data class PNMessage(
+    val verification: String? = null
+  )
+
+  private fun onVerification(code: String) {
+    CoroutineScope(Dispatchers.Default).launch {
+      chatModel.controller.sendCmd(
+        null,
+        CC.APIVerifySavedNtf(code),
+        log = true
+      )
+    }
+  }
+
+  override fun onMessage(message: PushMessage, instance: String) {
+    Log.d(TAG, "onMessage")
+    val pn: PNMessage = json.decodeFromString(String(message.content))
+    when {
+      pn.verification != null -> onVerification(pn.verification)
+    }
+    // TODO: Start same job than the periodic service ?
+    // Receiving the push notif is enough to wake the app and fetch msgs
+    // But it may not be enough when the phone is in doze, or with some
+    // vendors
+  }
+
+  override fun onNewEndpoint(endpoint: PushEndpoint, instance: String) {
+    Log.d(TAG, "onNewEndpoint")
+    endpoint.pubKeySet ?: run {
+      // Should not happen
+      Log.w(TAG, "Missing pubKeySet")
+      return
+    }
+    CoroutineScope(Dispatchers.Default).launch {
+      chatModel.controller.sendCmd(
+        null,
+        CC.APIRegisterWebPush(endpoint.url, endpoint.pubKeySet!!.auth, endpoint.pubKeySet!!.pubKey),
+        log = true
+      )
+    }
+  }
+
+  override fun onRegistrationFailed(reason: FailedReason, instance: String) {
+    Log.d(TAG, "onRegistrationFailed: $reason")
+    // TODO: notification to inform about failed registration
+  }
+
+  override fun onUnregistered(instance: String) {
+    Log.d(TAG, "onUnregistered")
+    // TODO: notification to inform about unregistration
+    CoroutineScope(Dispatchers.Default).launch {
+      chatModel.controller.sendCmd(
+        null,
+        CC.APIDeleteSavedNtf(),
+        log = true
+      )
+    }
+  }
+
+  companion object {
+    private const val TAG = "PushService"
+  }
+}

apps/multiplatform/android/src/main/java/chat/simplex/app/platform/PushManager.kt

@@ -55,7 +55,7 @@ object PushManager {
           showSelectPushServiceDialog(context, distributors) {
             UnifiedPush.saveDistributor(context, it)
             register(context)
-            onSuccess
+            onSuccess()
           }
         }
       }
@@ -202,4 +202,4 @@ object PushManager {
     } as String
   }
 
-}
+}