show notification for new friend request

app/src/main/AndroidManifest.xml

@@ -37,6 +37,12 @@
         <activity android:name=".Activities.ProfileActivity"
             android:screenOrientation="portrait"
             tools:ignore="LockedOrientationActivity" />
+
+        <service android:name=".Notification.FriendRequestMessagingService">
+            <intent-filter>
+                <action android:name="com.google.firebase.MESSAGING_EVENT"/>
+            </intent-filter>
+        </service>
     </application>
 
 </manifest>

app/src/main/java/com/android/beastchat/Activities/InboxActivity.kt

@@ -6,10 +6,8 @@ import android.util.Log
 import androidx.fragment.app.Fragment
 import com.android.beastchat.Fragments.InboxFragment
 import com.android.beastchat.Models.constants
-import com.google.firebase.database.DatabaseReference
 import com.google.firebase.database.FirebaseDatabase
 import com.google.firebase.iid.FirebaseInstanceId
-import com.google.firebase.messaging.FirebaseMessagingService
 
 class InboxActivity : BaseFragmentActivity() {
     override fun createFragment(): Fragment {

app/src/main/java/com/android/beastchat/Fragments/FindFriendsFragment.kt

@@ -195,7 +195,8 @@ class FindFriendsFragment : BaseFragments(), FindFriendsAdapter.UserListener {
                 mAllUsers.clear()
                 for(data in p0.children) {
                     val mUser = data.getValue(User::class.java)
-                    if(mUser!!.email != mUserEmailString && mUser!!.hasLoggedIn) {
+                    //it should not matter whether the user is logged in or not
+                    if(mUser!!.email != mUserEmailString) {
                         mAllUsers.add(mUser)
                     }
                     adapter.setmUsers(mAllUsers)

app/src/main/java/com/android/beastchat/Notification/FriendRequestMessagingService.kt

@@ -0,0 +1,74 @@
+package com.android.beastchat.Notification
+
+import android.annotation.SuppressLint
+import android.app.Notification
+import android.app.NotificationChannel
+import android.app.NotificationManager
+import android.app.PendingIntent
+import android.content.Context
+import android.content.Intent
+import android.graphics.Color
+import android.media.RingtoneManager
+import android.os.Build
+import androidx.core.app.NotificationCompat
+import com.android.beastchat.Activities.FriendsActivity
+import com.android.beastchat.R
+import com.google.firebase.messaging.FirebaseMessagingService
+import com.google.firebase.messaging.RemoteMessage
+
+class FriendRequestMessagingService : FirebaseMessagingService() {
+    override fun onMessageReceived(p0: RemoteMessage) {
+        super.onMessageReceived(p0)
+        var title = p0.data!!["title"]
+        var body = p0.data!!["body"]
+        sendNotification(title!!, body!!)
+
+    }
+
+    @SuppressLint("WrongConstant")
+    private fun sendNotification(title: String, body: String) {
+        val intent = Intent(this, FriendsActivity::class.java)
+        intent.flags = Intent.FLAG_ACTIVITY_CLEAR_TOP
+        val pendingIntent = PendingIntent.getActivity(
+            this,
+            0,
+            intent,
+            PendingIntent.FLAG_UPDATE_CURRENT
+        )
+        val pattern: Array<Long> = arrayOf(
+            500,500,500,500,500
+        )
+        val defaultSoundUri = RingtoneManager.getDefaultUri(RingtoneManager.TYPE_NOTIFICATION)
+
+        val nm = getSystemService(Context.NOTIFICATION_SERVICE) as NotificationManager
+
+        if(Build.VERSION.SDK_INT >= Build.VERSION_CODES.O) {
+//            nm.createNotificationChannel(
+//                NotificationChannel("first","FriendRequest",
+//                    NotificationManager.IMPORTANCE_HIGH)
+//            )
+            val importance = NotificationManager.IMPORTANCE_HIGH
+            var mChannel = nm.getNotificationChannel("first")
+            if(mChannel == null) {
+                mChannel = NotificationChannel("first", "FriendRequest", importance)
+                mChannel!!.description = "FriendRequest"
+                mChannel!!.enableVibration(true)
+                mChannel!!.lightColor = Color.BLUE
+                mChannel!!.vibrationPattern = pattern!!.toLongArray()
+                nm.createNotificationChannel(mChannel)
+            }
+        }
+
+        val clickableNotification =  NotificationCompat.Builder(this, "first")
+            .setContentTitle(title)
+            .setContentText(body)
+            .setVibrate(pattern.toLongArray())
+            .setSmallIcon(R.drawable.ic_launcher_foreground)
+            .setLights(Color.BLUE, 1, 1)
+            .setSound(defaultSoundUri)
+            .setContentIntent(pendingIntent)
+            .setPriority(NotificationCompat.PRIORITY_HIGH)
+
+        nm.notify(0, clickableNotification.build())
+    }
+}

node-server/firebase/friend-services.js

@@ -2,6 +2,10 @@ var app = require('express')();
 var http = require('http').Server(app);
 var io = require('socket.io')(http);
 var admin = require("firebase-admin");
+var FCM = require("fcm-push");
+var serverKey = '---';
+var fcm = new FCM(serverKey);
+
 
 var userFriendRequests = (io) => {
   io.on('connection', function(socket){
@@ -70,8 +74,28 @@ function sendOrDeleteFriendRequest(socket, io) {
           userPicture: snapshot.val().userPicture,
           dateJoined: snapshot.val().dateJoined,
           hasLoggedIn: snapshot.val().hasLoggedIn,
-        })
-      })
+        });
+      });
+
+      var tokenRef = db.ref('userToken');
+      var friendToken = tokenRef.child(encodeEmail(friendEmail));
+
+      friendToken.once('value', (snapshot)=> {
+        var message = {
+          to:snapshot.val().token,
+          data:{
+            title: 'Beast Chat',
+            body: `Friend request from ${userEmail}`
+          }
+        };
+        fcm.send(message)
+        .then((response)=> {
+          console.log('Message Sent!');
+        }).catch((err)=>{
+          console.log(err);
+        });
+      });
+
     } else {
       friendRef.remove();
     }