Add messaging service

src/app/service/messaging.service.spec.ts

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+import { TestBed } from '@angular/core/testing';
+
+import { MessagingService } from './messaging.service';
+
+describe('MessagingService', () => {
+  beforeEach(() => TestBed.configureTestingModule({}));
+
+  it('should be created', () => {
+    const service: MessagingService = TestBed.get(MessagingService);
+    expect(service).toBeTruthy();
+  });
+});

src/app/service/messaging.service.ts

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+import { Injectable } from '@angular/core';
+import { ApiService } from '../providers/api-service';
+import { AngularFireMessaging } from '@angular/fire/messaging';
+import { BehaviorSubject } from 'rxjs';
+
+@Injectable()
+
+export class MessagingService {
+  currentMessage = new BehaviorSubject(null);
+
+  constructor(
+    private angularFireMessaging: AngularFireMessaging,
+    private api: ApiService
+  ) {
+    this.angularFireMessaging.messages.subscribe((_messaging: AngularFireMessaging) => {
+      _messaging.onMessage = _messaging.onMessage.bind(_messaging);
+      _messaging.onTokenRefresh = _messaging.onTokenRefresh.bind(_messaging);
+    })
+  }
+
+  requestPermission() {
+    this.angularFireMessaging.requestToken.subscribe((token) => {
+      console.log("Device token: " + token);
+      return
+      this.api.addDeviceToken(token).subscribe(
+        result => {
+          console.log("Device registered successfully!");
+        },
+        error => {
+          console.error("Device could not be registered!", error._body);
+        }
+      );
+    }, (err) => {
+      console.error('Unable to get permission to notify.', err);
+    });
+  }
+
+  receiveMessage() {
+    this.angularFireMessaging.messages.subscribe((payload) => {
+      console.log("new message received. ", payload);
+      this.currentMessage.next(payload);
+    });
+  }
+}

src/firebase-messaging-sw.js

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+importScripts('https://www.gstatic.com/firebasejs/8.0.0/firebase-app.js');
+importScripts('https://www.gstatic.com/firebasejs/8.0.0/firebase-messaging.js');
+
+firebase.initializeApp({
+  apiKey: "AIzaSyB-iIcMH_eyfFT043_8pSGX3YYugpjm3Fg",
+  authDomain: "localspend-47012.firebaseapp.com",
+  databaseURL: "https://localspend-47012.firebaseio.com",
+  projectId: "localspend-47012",
+  storageBucket: "localspend-47012.appspot.com",
+  messagingSenderId: "469562689216",
+  appId: "1:469562689216:web:43378a652e829fed354f25",
+  measurementId: "G-8NMVL6RL8C"  
+});
+
+const messaging = firebase.messaging();