app.js

const history = require('connect-history-api-fallback');

var createError = require('http-errors');
var express = require('express');
var path = require('path');
var cookieParser = require('cookie-parser');
var logger = require('morgan');
var cors = require('cors');
const passport = require('passport');
const cookieSession = require('cookie-session');
require('dotenv').config({ silent: process.env.NODE_ENV === 'production' });
require('./facebook-setup');
require('./google-setup');

var indexRouter = require('./routes/index');
var usersRouter = require('./routes/users');
var coursesRouter = require('./routes/courses');
var reviewsRouter = require('./routes/reviews');
var authRouter = require('./routes/auth-routes');
var searchRouter = require('./routes/search');

const config = process.env;
const User = require('./models/user');

// CITATION: used https://medium.com/free-code-camp/how-to-set-up-twitter-oauth-using-passport-js-and-reactjs-9ffa6f49ef0
// tutorial for login oauth setup

var app = express();

//connect to mongo db
const mongoose = require('mongoose');
mongoose
	.connect(
		'mongodb+srv://' +
			config.DB_USER +
			':' +
			config.DB_PW +
			'@sandbox-7vuqw.mongodb.net/' +
			config.DB_DBNAME +
			'?retryWrites=true&w=majority',
		{ useNewUrlParser: true }
	)
	.then(() => {
		console.log('Connection to the Atlas Cluster is successful!');
	})
	.catch((err) => console.error(err));

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

// deserialize the cookieUserId to user in the database
passport.deserializeUser((user, done) => {
	User.findById(user._id)
		.then((user) => {
			done(null, user);
		})
		.catch((e) => {
			done(new Error('Failed to deserialize an user'));
		});
});

// view engine setup
app.set('views', path.join(__dirname, 'views'));
app.set('view engine', 'jade');

app.use(
	cookieSession({
		name: 'session',
		keys: ['thisappisawesome'],
		maxAge: 24 * 60 * 60 * 100,
	})
);
app.use(cors({ origin: config.CLIENT_BASE_URL, credentials: true }));
app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(express.static(path.join(__dirname, 'public')));
app.use(cookieParser());
app.use(passport.initialize());
app.use(passport.session());

app.use('/', indexRouter);
app.use('/users', usersRouter);
app.use('/courses', coursesRouter);
app.use('/reviews', reviewsRouter);
app.use('/auth', authRouter);
app.use('/search', searchRouter);

app.use(history({ verbose: true }));

app.use(express.static(path.join(__dirname, 'react_app', 'build')));
app.use(express.static(path.join(__dirname, 'public')));

// catch 404 and forward to error handler
app.use(function (req, res, next) {
	next(createError(404));
});

// error handler
app.use(function (err, req, res, next) {
	// set locals, only providing error in development
	res.locals.message = err.message;
	res.locals.error = req.app.get('env') === 'development' ? err : {};

	// render the error page
	res.status(err.status || 500);
	res.render('error');
});

app.get('*', (req5, res1) => {
	res.sendFile(path.resolve(__dirname, 'react_app', 'build', 'index.html'));
});

module.exports = app;