oAth Gmail Configuration using node.js

oauth.js:

const GoogleStrategy = require('passport-google-oauth').OAuth2Strategy;
module.exports = (passport) => {
    passport.serializeUser((user, done) => {
        done(null, user);
    });
    passport.deserializeUser((user, done) => {
        done(null, user);
    });
    passport.use(new GoogleStrategy({
            clientID: '382676186715-498u44993pmuuh735h2mg62olrq5lvlv.apps.googleusercontent.com',
            clientSecret: 'X-kksGokyz_yVmi91--3_n-I',
            callbackURL: 'https://example.com/amp-access/amp-access/login/gmail_login/callback',
        },
        (token, refreshToken, profile, done) => {
            return done(null, {
                profile: profile,
                token: token
            });
        }));
};

login.js

//this is to login using gmail
router.get('/gmail_login', 
	
	//middlware1
	(req, res, next) => { 
		console.log('readerId from index page: ' + req.query.rid);
		//stroing readerId to use it later
		RID = req.query.rid;
		//storing return url to come back later
		RURL = req.query.return;
		//is to go to next middleware2
		next();
	},

	//middleware2
	//this is to authenticate gmail login
	passport.authenticate('google', {
	scope: [
        'https://www.googleapis.com/auth/userinfo.profile',
        'https://www.googleapis.com/auth/userinfo.email'
		]
	})
);

router.get('/gmail_login/callback',

	//middleware1
	//if user enters wrong password, prompt him again
    passport.authenticate('google', {
        failureRedirect: '/'
    }),

	//middleware2
	(req, res) => {

		//get user profile and save and secure it as per your business requirement
	}
	
);