server.js

const express = require('express');
const app = express();

const bodyparser = require('body-parser');
const session = require('express-session');

const path = require('path');
const ejs = require('ejs');

const cookieParser = require('cookie-parser');
const i18n = require('i18n');

const passport = require('passport');
const { Strategy } = require('passport-discord');

/**
 * Load function is responsible for initializing and configuring the express app, setting up middleware,
 * defining routes, and starting the web server.
 *
 * @param {Client} client - the client object used for interacting with external services
 */
module.exports.load = async (client) => {
	app.use(bodyparser.json());
	app.use(bodyparser.urlencoded({ extended: true }));
	app.use(express.json());
	app.engine('html', ejs.renderFile);
	app.set('view engine', 'ejs');
	app.set('views', path.join(__dirname, '/views'));
	app.use(express.static(path.join(__dirname, '/public')));
	app.use(session({
		secret: process.env.CLIENT_SECRET,
		resave: false,
		saveUninitialized: false,
	}));

	// Configure cookie parser
	app.use(cookieParser());

	// Configure i18n
	i18n.configure({
		locales: ['en', 'ro'],
		directory: __dirname + '/i18n',
		defaultLocale: 'en',
		cookie: 'locale',
		autoReload: false,
		updateFiles: false,
		objectNotation: true,
	});

	// Initialize passport and restore authentication state, if any, from the session.
	app.use(async function(req, res, next) {
		req.client = client;
		next();
	});

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

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

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

	passport.use(new Strategy({
		clientID: process.env.CLIENT_ID,
		clientSecret: process.env.CLIENT_SECRET,
		callbackURL: process.env.CALLBACK_URL,
		scope: [ 'identify', 'guilds' ],
	}, function(accessToken, refreshToken, profile, done) {
		process.nextTick(function() {
			return done(null, profile);
		});
	}));


	// Initialize i18n middleware and set the default locale to 'en' if it's not set in the session or in the request headers or cookies or in the environment
	app.use(i18n.init);

	// Define routes here
	app.use('/', require('./routes/index'));
	app.use('/dashboard', require('./routes/dashboard'));

	// 404 handler
	app.get('*', (req, res) => {
		res.render('../views/404', {
			bot: req.client,
			user: req.user,
		});
	});

	// Start the web server
	app.listen(process.env.PORT, () => {
		console.log(`[Dashboard]: Web server now online on port:${process.env.PORT} 📶.`);
	});
};