oauth_utilities.js

const  fs = require('fs');
const dotenv = require('dotenv');
const passport = require('passport');
const {Strategy} = require('passport-google-oauth20');
const cookieSession = require('cookie-session');

/* to do list */
/* 1. apply a set of google cloud api
 * 2. init a .env file which include a set of your sensitve datas
 * 3. app.use(setup_cookie);
 * 4. app.use(setup_passport);
 * 5. app.get('/auth/google/callback', passport_authenticate_process);
*/

//replcae with your true key
const config = {
    GOOGLE_CLIENT_ID: process.env.GOOGLE_CLIENT_ID,
    GOOGLE_CLIENT_SECRET: process.env.GOOGLE_CLIENT_SECRET ,
    COOKIE_KEY_1: process.env.COOKIE_KEY_1,
    COOKIE_KEY_2: process.env.COOKIE_KEY_2
}

const auth_options = {
    callbackURL: '/auth/google/callback',
    clientID: config.GOOGLE_CLIENT_ID,
    clientSecret: config.GOOGLE_CLIENT_SECRET
}

const passport_options = {
    failureRedirect: '/auth/failure',
    successRedirect: '/auth/success',
    session: true,
    failureMessage: true
}

const cookie_options = {
    name: 'session',
    maxAge: 24 * 60 * 60 * 1000,
    keys: [config.COOKIE_KEY_1, config.COOKIE_KEY_2]
}

function verifyCallback(accessToken, refreshToken, profile, done){
    console.log('google profile', profile);
    done(null, profile);
}

passport.use(new Strategy(auth_options, verifyCallback));
passport.serializeUser((user, done)=>{
    done(null, user);
});
passport.deserializeUser((user, done)=>{
    done(null, user);
})

module.exports = {
    setup_cookie: cookieSession(cookie_options),
    setup_passport: passport.session(),
    passport_authenticate_process: [
        passport.authenticate('google', passport_options),
        (req, res)=>{console.log('google callback');}
    ],

}