GoogleOneTap

Google one tap for Angular application.

Getting started

Install via npm

npm i ng-google-one-tap

Import the module

In your AppModule, import the NgGoogleOneTapModule

import { NgGoogleOneTapModule } from 'ng-google-one-tap';

@NgModule({
declarations: [
...
],
imports: [
...
NgGoogleOneTapModule.config(
    {  //Look options table for some more avaialbe options and config here.
        client_id: 'App_client_id',
        cancel_on_tap_outside: false,
        authvalidate_by_googleapis: false,
        auto_select: false,
        disable_exponential_cooldowntime: false,
        context: 'signup',
        ...
    })
],
providers: [],
bootstrap: [...]
})
export class AppModule { }

NgOneTap service

import { NgOneTapService } from 'ng-google-one-tap';

@Component({
  selector: 'app-demo',
  templateUrl: './demo.component.html',
  styleUrls: ['./demo.component.css']
})
export class DemoComponent implements OnInit {

  userDetails;
  constructor(private oneTap: NgOneTapService) { }

   ngOnInit() {
        this.oneTap.tapInitialize(); //Initialize OneTap, At intial time you can pass config  like this.oneTap.tapInitialize(conif) here config is optional.
        this.oneTap.promtMoment.subscribe(res => {  // Subscribe the Tap Moment. following response options all have self explanatory. If you want more info pls refer official document below attached link.
           res.getDismissedReason(); 
           res.getMomentType();
           res.getNotDisplayedReason();
           res.getSkippedReason();
           res.isDismissedMoment();
           res.isDisplayed();
           res.isNotDisplayed();
           res.isSkippedMoment();
        });
        this.oneTap.oneTapCredentialResponse.subscribe(res => { // After continue with one tap JWT credentials response.
            console.log(res);
        });
        this.oneTap.authUserResponse.subscribe(res => {  // Use Auth validation by using google OAuth2 apis. Note: this one for testing and debugging purpose.
            this.userDetails = res;
        });

   }

    tapCancel() {
        this.oneTap.cancelTheTap();
    }

}

Options

Name	Type	Required	Description
client_id	String	true	Your application's client ID
disable_exponential_cooldowntime	Boolean	false	when Close X one tap promt it's take reset/reshowing take some times this called Exponential cool down. you can disable that using this option Note: Recommended for development mode. If you want to use this feature in prod before pls check with official doc. link below.
authvalidate_by_googleapis	Boolean	false	Validate the user without backend-server validation by using google provide APIs. Note: Recommended for development mode. If pro mode need to validate JWT one tap returned credentials from backend-server by using google-auth-library
auto_select	Boolean	false	Enables automatic selection.
cancel_on_tap_outside	Boolean	false	Cancels the prompt if the user clicks outside the prompt.
context	String	false	The title and words in the One Tap prompt

Resource

1. Exponential cooldown
   
2. Google One Tap Implementation doc by google
   
3. Google library and API

Server

Using one of the Google API Client Libraries (e.g. Java, Node.js, PHP, Python) is the recommended way to validate Google ID tokens in a production environment.

npm install google-auth-library --save

Node.js

const { OAuth2Client } = require('google-auth-library');
const client = new OAuth2Client(CLIENT_ID);
async function verify() {
	const ticket = await client.verifyIdToken({
		idToken: token,
		audience: CLIENT_ID, // Specify the CLIENT_ID of the app that accesses the backend
		// Or, if multiple clients access the backend:
		//[CLIENT_ID_1, CLIENT_ID_2, CLIENT_ID_3]
	});
	const payload = ticket.getPayload();
	const userid = payload['sub'];
	// If request specified a G Suite domain:
	// const domain = payload['hd'];
}
verify().catch(console.error);

More Reference - https://developers.google.com/identity/sign-in/web/backend-auth#using-a-google-api-client-library