Node JS Passport Google OAuth Not Authenticating

Question

I followed the following document and tried to setup Google OAuth for my nodeJS application: https://cloud.google.com/nodejs/getting-started/authenticate-users

My oauth2.js code is as follows:

const express = require('express');
const passport = require('passport');
const GoogleStrategy = require('passport-google-oauth20').Strategy;
function extractProfile (profile) {
 let imageUrl = '';
 if (profile.photos && profile.photos.length) {
 imageUrl = profile.photos[0].value;
 }
 return {
 id: profile.id,
 displayName: profile.displayName,
 image: imageUrl
 };
}
passport.use(new GoogleStrategy({
 clientID: <CLIENT ID as string>,
 clientSecret: <CLIENT SECRET as string>,
 callbackURL: 'http://<APP DOMAIN>/auth/google/callback'
}, (accessToken, refreshToken, profile, cb) => {
 cb(null, extractProfile(profile));
}));
passport.serializeUser((user, cb) => {
 cb(null, user);
});
passport.deserializeUser((obj, cb) => {
 cb(null, obj);
});
const router = express.Router();
function authRequired(req, res, next){
 if(!req.user){
 req.session.oauth2return = req.originalUrl;
 return res.redirect('/auth/login');
 }
 next();
}
function addTemplateVariables(req, res, next){
 res.locals.profile = req.user;
 res.locals.login = `/auth/login?return=${encodeURIComponent(req.originalUrl)}`;
 res.locals.logout = `/auth/logout?return=${encodeURIComponent(req.originalUrl)}`;
 next();
}
router.get(
 '/auth/login',
 (req, res, next) => {
 if(req.query.return) {
 req.session.oauth2return = req.query.return;
 }
 next();
 },
 passport.authenticate('google', {scope: ['email', 'profile']})
);
router.get('/auth/google/callback',
 passport.authenticate('google', {
 successRedirect: '/index',
 failureRedirect: '/'
 })
);
router.get('/auth/logout', (req, res)=>{
 req.logout();
 res.redirect('/');
});
module.exports = {
 extractProfile: extractProfile,
 router: router,
 required: authRequired,
 template: addTemplateVariables
};

And it seems like everything else is working fine. I am redirected to the Google OAuth Consent Screen, and after signing in, I am supposed to select ALLOW (to give permission). However, when I am redirected to /auth/google/callback, the passport.authenticate('google' ... part is not authenticating, and I get a 404 Not Found error (not a cannot GET error).

I know the redirecting is working properly because if I try

router.get('/auth/google/callback',
 function(req, res){
 res.redirect('/index');
 }
);

the app redirects without a problem.

What should I try? I'm guessing it's something to do with the token, but I have no idea what to check/fix.

Thank you so much in advance.

Answer 1

http://voidcanvas.com/googles-oauth-api-node-js/ I ended up using googleapis package, following the steps in the above link. It works like magic ;)