final-fb-passport

api.js

const express = require('express');
const passport = require('passport');
const router = express.Router();

const { fbAuth, fbCb } = require('../lib/facebook');

router.get('/oauth/:id/facebook', fbAuth);
router.get('/oauth/:id/facebook', fbAuth());

module.exports = router;

app.js

const passport = require('passport');
const apiRouter = require('./routes/api');

const app = express();

app.use(passport.initialize());
app.use(passport.session());

app.use('/api', apiRouter);

facebook.js

const models = require('../models');
const email = require('../utils/email');
const passportFacebook = require('../auth/facebook');

const fbAuth = (req, res) => {
    req.session.isRegisterUser = req.query.isRegisterUser || false;
    req.session.regUserId = req.params.id > 0 ? req.params.id : null;
    req.session.redirectUrlAfterSignIn = req.query.redirectUrl ? req.query.redirectUrl : null;
    return passportFacebook.authenticate('facebook', {})(res, req);
};

const fbCb = (req, res) => {
    return passportFacebook.authenticate('facebook', {
        successRedirect: '/step4',
        failureRedirect: '/login'
    }, (err, profile) => {
        console.log(err);
        console.log(profile);
    })(req, res);
};

module.exports = {
    fbCb,
    fbAuth
};

facebookInit.js

const passport = require('passport');
const Strategy = require('@passport-next/passport-facebook').Strategy;

passport.use(new Strategy({
        clientID: process.env.FACEBOOK_APP_ID,
        clientSecret: process.env.FACEBOOK_SECRET,
        callbackURL: 'http://localhost:3001/api/oauth/facebook/callback',
        graphApiVersion: 'v3.1',
        // scope: ['email']
    },
    function(accessToken, refreshToken, profile, cb) {
        // NEVER called
        console.log(`accessToken`, accessToken);
        console.log(`profile`, profile);
        return cb(null, profile);
    }
));

passport.serializeUser(function(user, done) {
    done(null, user.id);
});

passport.deserializeUser(function(id, done) {
    return models.User.findById(id).then(user=>{
        done(null, user);
    }).catch(function (err) {
        done(null, null);
    });
});

module.exports = passport;