app.js

const express = require('express');
const passport = require('passport');
const session = require('express-session');
const GitHubStrategy = require('passport-github2').Strategy;
require('dotenv').config();

const app = express();
app.use(session({
    secret: 'keyboard cat',
    resave: false,
    saveUninitialized: false
}));

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

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

passport.deserializeUser(function(id, done) {
    // to build
    User.findById(id, function(err, user) {
        done(err, user);
    });
});

passport.use(new GitHubStrategy({
    clientID: process.env.GITHUB_CLIENT_ID,
    clientSecret: process.env.GITHUB_CLIENT_SECRET,
    callbackURL: "http://localhost:3000/auth/github/callback"
    },
    function(accessToken, refreshToken, profile, done) {
        // log the information we got back
        console.log(profile);

        
        return done(null, profile);
    }
));

app.get('/auth/github', passport.authenticate('github', { scope: [ 'user:email' ] }));

app.get('/auth/github/callback', passport.authenticate('github', { failureRedirect: '/login' }),
    function(req, res) {
        // Successful authentication, redirect home.
        res.redirect('/');
    }
);


app.listen(3000);