app.js

/* 
 * Package Imports
*/

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

const app = express();


/*
 * Variable Declarations
*/

const PORT = 3000;
const GITHUB_CLIENT_ID = process.env.GITHUB_CLIENT_ID;
const GITHUB_CLIENT_SECRET = process.env.GITHUB_CLIENT_SECRET;

/*
 * Passport Configurations
*/
passport.use(new GitHubStrategy({
  clientID: GITHUB_CLIENT_ID,
  clientSecret: GITHUB_CLIENT_SECRET,
  callbackURL: "http://localhost:3000/auth/github/callback"
}, (accessToken, refreshToken, profile, done) => {
  return done(null, profile);
}))

passport.serializeUser((user, done) => {
  done(null, user);
});

passport.deserializeUser((user, done) => {
  done(null, user);
});


/*
 *  Express Project Setup
*/
app.set('views', __dirname + '/views');
app.set('view engine', 'ejs');
app.use(partials());
app.use(express.json());
app.use(express.static(__dirname + '/public'));
app.use(session({
  secret: 'codecademy',
  resave: false,
  saveUninitialized: false
}))
app.use(passport.initialize())
app.use(passport.session())



/*
 * Routes
*/

app.get('/', (req, res) => {
  res.render('index', { user: req.user });
})

app.get('/account', ensureAuthenticated, (req, res) => {
  res.render('account', { user: req.user });
});

app.get('/login', (req, res) => {
  res.render('login', { user: req.user });
})

app.get('/logout', (req, res) => {
  req.logout();
  res.redirect('/');
});

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

app.get(
  "/auth/github/callback",
  passport.authenticate("github", {
    failureRedirect: "/login",
    successRedirect: "/",
  })
);


/*
 * Listener
*/

app.listen(PORT, () => console.log(`Listening on http://localhost${PORT}`));

/*
 * ensureAuthenticated Callback Function
*/

function ensureAuthenticated(req, res, next) {
  if (req.isAuthenticated()) {
    return next();
  } else {
    res.redirect("/login");
  }
}