app.js

if(process.env.NODE_ENV != "production") {
    require('dotenv').config();
}

const express = require('express');
const mongoose = require('mongoose');
const path = require('path');
const ejsMate = require('ejs-mate');
const methodOverride = require('method-override');
const session = require('express-session');
const MongoStore = require('connect-mongo');
const flash = require('connect-flash');
const passport = require('passport');
const LocalStrategy = require('passport-local');
const User = require('./models/users.js');
require('dotenv').config();

const ExpressError = require('./utils/ExpressError.js');

const listingRouter = require('./routes/listing.js');
const reviewRouter = require('./routes/review.js');
const userRouter = require('./routes/user.js');

const dbUrl =  process.env.ATLASDB_URL;

main()
.then(()=>{
    console.log("Connected to DB");
})
.catch((err)=>{
    console.log(err);
});

async function main() {
    await mongoose.connect(dbUrl);
}

const app = express();

app.use(express.json());
app.use(methodOverride('_method'));
app.use(express.urlencoded({extended : true}));

app.set('view engine', 'ejs');
app.set('views', path.join(__dirname, 'views'));
app.use(express.static(path.join(__dirname, 'public')));
app.engine('ejs', ejsMate);

const store = MongoStore.create({
    mongoUrl : dbUrl,
    crypto : {
        secret : process.env.SECRET
    },
    touchAfter : 24 * 3600   
});

store.on("error", () => {
    console.log("ERROR in MONGO SESSION STORE", err);
});

const sessionOption = {
    store,
    secret : process.env.SECRET,
    resave : false,
    saveUninitialized : true,
    cookie : {
        expires : Date.now() + 7 * 24 * 60 * 60 * 1000,
        maxAge : 7 * 24 * 60 * 60 * 1000,
        httpOnly : true
    }
}

app.use(session(sessionOption));
app.use(flash());
app.use(passport.initialize());
app.use(passport.session());
passport.use(new LocalStrategy(User.authenticate()));
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());

app.use((req, res, next) => {
  res.locals.success = req.flash('success');
  res.locals.error = req.flash('error');
  res.locals.currUser = req.user;
  next();
});

app.use('/', userRouter);
app.use('/listings/:id/review', reviewRouter)
app.use('/listings', listingRouter);

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

// If non of route matches

app.use((req, res, next) => {
    next(new ExpressError(404, 'Page Not Found!'));
});

app.use((err, req, res, next)=>{
   let { statusCode = 500, message = "Something went wrong!" } = err;
   res.status(statusCode).render("err", {err});
});

app.listen(8080, (req, res)=>{
    console.log(`Server is listening on port http://localhost:8080`);
});