Lecture 370:- Setting up Passport - Google - oAuth

To set up passport-google-oauth20 in your application, follow these steps:

1. Install passport and passport-google-oauth20 packages:

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npm install passport passport-google-oauth20

1. Create a Google Cloud Platform project in the Google API Console.
2. Add credentials to the project:

• From the APIs & Services dashboard, select Credentials.
• On the Credentials page, click Create credentials and select OAuth client ID.
• Under Application type, select Web application.
• Add a name for the credential, then add authorized JavaScript origins and authorized redirect URIs.
• Click Create.

1. Set up the passport strategy in your application:

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const passport = require('passport'); const GoogleStrategy = require('passport-google-oauth20').Strategy; passport.use(new GoogleStrategy({    clientID: process.env.GOOGLE_CLIENT_ID,    clientSecret: process.env.GOOGLE_CLIENT_SECRET,    callbackURL: '/auth/google/callback'  },  function(accessToken, refreshToken, profile, cb) {    // User authentication and/or registration code here    return cb(null, profile);  } ));

1. Set up the routes in your application:

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const express = require('express'); const passport = require('passport'); const router = express.Router(); // Google authentication route router.get('/auth/google',  passport.authenticate('google', { scope: ['profile'] })); // Google authentication callback route router.get('/auth/google/callback',  passport.authenticate('google', { failureRedirect: '/login' }),  function(req, res) {    // Successful authentication, redirect to the home page    res.redirect('/');  });

1. Use the passport.authenticate() middleware to authenticate requests to your protected routes:

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const express = require('express'); const router = express.Router(); // Protected route router.get('/protected',  passport.authenticate('google', { session: false }),  function(req, res) {    // The user is authenticated, respond with a success message    res.send('You are authenticated!');  });

Note: In step 4, the callback function receives an accessToken, a refreshToken, a profile, and a cb (callback) function. You will need to implement the user authentication and/or registration code in this function.