app.js

if(process.env.NODE_ENV != "production"){
    require('dotenv').config();
}
const express = require("express");
const app = express();
const mongoose = require("mongoose");
// const MONGO_URL = "mongodb://127.0.0.1:27017/lodgify";
const dbUrl = process.env.ATLASDB_URL;
const path = require("path");
const methodOverride = require("method-override");
const ejsMate = require("ejs-mate");
const ExpressError = require("./utils/ExpressError.js");
const cookieParser = require("cookie-parser");
const session = require("express-session");
const MongoDBStore = require("connect-mongo");
const flash = require("connect-flash");
const passport = require("passport");
const LocalStrategy = require("passport-local")
const User = require("./models/user.js");
const multer  = require('multer');
const upload = multer({ dest: 'uploads/' });

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

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

async function main() {
    await mongoose.connect(dbUrl);
  
    // use `await mongoose.connect('mongodb://user:password@127.0.0.1:27017/test');` if your database has auth enabled
  }
  const store = MongoDBStore.create({
    mongoUrl: dbUrl,
    crypto:{
        secret: process.env.SECRET,
    },
    touchAfter: 24*60*60,
});
store.on("error", function(e){
    console.log("session store error",e);
});

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

app.use(session(sessionOptions));
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.set("view engine","ejs");
app.set("views",path.join(__dirname,"views"));
app.use(express.static(path.join(__dirname,"public")));
app.use(express.urlencoded({extended: true}));
app.use(methodOverride("_method"));
app.engine("ejs",ejsMate);
app.use(cookieParser());

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




app.use((req,res,next) => {
    res.locals.success = req.flash("success");
    res.locals.error = req.flash("error");
    res.locals.currentUser = req.user;
    res.locals.returnTo = req.session.returnTo;
    next();
});

app.use("/listings",listingRouter);
app.use("/listings/:id/reviews",reviewRouter);
app.use("/",userRouter);

app.all("*", (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("error.ejs",{err});
});

app.listen(8080, () =>{
    console.log("server is listening on port 8080");
});