[CST-6753] Change google-analytics.service in order to use GoogleTagManager instead of GoogleAnalytics

src/app/statistics/google-analytics.service.spec.ts

@@ -1,20 +1,19 @@
 import { GoogleAnalyticsService } from './google-analytics.service';
-import { Angulartics2GoogleAnalytics } from 'angulartics2';
+import { Angulartics2GoogleTagManager } from 'angulartics2';
 import { ConfigurationDataService } from '../core/data/configuration-data.service';
-import {
+import { createFailedRemoteDataObject$, createSuccessfulRemoteDataObject$ } from '../shared/remote-data.utils';
-  createFailedRemoteDataObject$,
-  createSuccessfulRemoteDataObject$
-} from '../shared/remote-data.utils';
 import { ConfigurationProperty } from '../core/shared/configuration-property.model';
 
 describe('GoogleAnalyticsService', () => {
   const trackingIdProp = 'google.analytics.key';
   const trackingIdTestValue = 'mock-tracking-id';
   const innerHTMLTestValue = 'mock-script-inner-html';
+  const srcTestValue = 'mock-script-src';
   let service: GoogleAnalyticsService;
-  let angularticsSpy: Angulartics2GoogleAnalytics;
+  let angularticsSpy: Angulartics2GoogleTagManager;
   let configSpy: ConfigurationDataService;
   let scriptElementMock: any;
+  let srcSpy: any;
   let innerHTMLSpy: any;
   let bodyElementSpy: HTMLBodyElement;
   let documentSpy: Document;
@@ -28,18 +27,21 @@ describe('GoogleAnalyticsService', () => {
   });
 
   beforeEach(() => {
-    angularticsSpy = jasmine.createSpyObj('angulartics2GoogleAnalytics', [
+    angularticsSpy = jasmine.createSpyObj('Angulartics2GoogleTagManager', [
       'startTracking',
     ]);
 
     configSpy = createConfigSuccessSpy(trackingIdTestValue);
 
     scriptElementMock = {
+      set src(newVal) { /* noop */ },
+      get src() { return innerHTMLTestValue; },
       set innerHTML(newVal) { /* noop */ },
-      get innerHTML() { return innerHTMLTestValue; }
+      get innerHTML() { return srcTestValue; }
     };
 
     innerHTMLSpy = spyOnProperty(scriptElementMock, 'innerHTML', 'set');
+    srcSpy = spyOnProperty(scriptElementMock, 'src', 'set');
 
     bodyElementSpy = jasmine.createSpyObj('body', {
       appendChild: scriptElementMock,
@@ -106,19 +108,22 @@ describe('GoogleAnalyticsService', () => {
       describe('when the tracking id is non-empty', () => {
         it('should create a script tag whose innerHTML contains the tracking id', () => {
           service.addTrackingIdToPage();
-          expect(documentSpy.createElement).toHaveBeenCalledTimes(1);
+          expect(documentSpy.createElement).toHaveBeenCalledTimes(2);
           expect(documentSpy.createElement).toHaveBeenCalledWith('script');
 
           // sanity check
           expect(documentSpy.createElement('script')).toBe(scriptElementMock);
 
+          expect(srcSpy).toHaveBeenCalledTimes(1);
+          expect(srcSpy.calls.argsFor(0)[0]).toContain(trackingIdTestValue);
+
           expect(innerHTMLSpy).toHaveBeenCalledTimes(1);
           expect(innerHTMLSpy.calls.argsFor(0)[0]).toContain(trackingIdTestValue);
         });
 
         it('should add a script to the body', () => {
           service.addTrackingIdToPage();
-          expect(bodyElementSpy.appendChild).toHaveBeenCalledTimes(1);
+          expect(bodyElementSpy.appendChild).toHaveBeenCalledTimes(2);
         });
 
         it('should start tracking', () => {

src/app/statistics/google-analytics.service.ts

@@ -1,5 +1,5 @@
 import { Inject, Injectable } from '@angular/core';
-import { Angulartics2GoogleAnalytics } from 'angulartics2';
+import { Angulartics2GoogleTagManager } from 'angulartics2';
 import { ConfigurationDataService } from '../core/data/configuration-data.service';
 import { getFirstCompletedRemoteData } from '../core/shared/operators';
 import { isEmpty } from '../shared/empty.util';
@@ -13,7 +13,8 @@ import { DOCUMENT } from '@angular/common';
 export class GoogleAnalyticsService {
 
   constructor(
-    private angulartics: Angulartics2GoogleAnalytics,
+    // private angulartics: Angulartics2GoogleAnalytics,
+    private angulartics: Angulartics2GoogleTagManager,
     private configService: ConfigurationDataService,
     @Inject(DOCUMENT) private document: any,
   ) { }
@@ -36,15 +37,16 @@ export class GoogleAnalyticsService {
       // make sure we received a tracking id
       if (isEmpty(trackingId)) { return; }
 
-      // add trackingId snippet to page
+      // add GTag snippet to page
       const keyScript = this.document.createElement('script');
-      keyScript.innerHTML =   `(function(i,s,o,g,r,a,m){i['GoogleAnalyticsObject']=r;i[r]=i[r]||function(){
+      keyScript.src = `https://www.googletagmanager.com/gtag/js?id=${trackingId}`;
-                              (i[r].q=i[r].q||[]).push(arguments)},i[r].l=1*new Date();a=s.createElement(o),
-                              m=s.getElementsByTagName(o)[0];a.async=1;a.src=g;m.parentNode.insertBefore(a,m)
-                              })(window,document,'script','https://www.google-analytics.com/analytics.js','ga');
-                              ga('create', '${trackingId}', 'auto');`;
       this.document.body.appendChild(keyScript);
 
+      const libScript = this.document.createElement('script');
+      libScript.innerHTML = `window.dataLayer = window.dataLayer || [];function gtag(){window.dataLayer.push(arguments);}
+                             gtag('js', new Date());gtag('config', '${trackingId}');`;
+      this.document.body.appendChild(libScript);
+
       // start tracking
       this.angulartics.startTracking();
     });

src/modules/app/server-app.module.ts

@@ -6,8 +6,7 @@ import { ServerModule, ServerTransferStateModule } from '@angular/platform-serve
 
 import { TranslateLoader, TranslateModule } from '@ngx-translate/core';
 
-import { Angulartics2 } from 'angulartics2';
+import { Angulartics2, Angulartics2GoogleTagManager } from 'angulartics2';
-import { Angulartics2GoogleAnalytics } from 'angulartics2';
 
 import { AppComponent } from '../../app/app.component';
 
@@ -60,7 +59,7 @@ export function createTranslateLoader(transferState: TransferState) {
       useClass: Angulartics2Mock
     },
     {
-      provide: Angulartics2GoogleAnalytics,
+      provide: Angulartics2GoogleTagManager,
       useClass: AngularticsProviderMock
     },
     {