app.js

var express = require('express');
var path = require('path');
var favicon = require('serve-favicon');
var logger = require('morgan');
var cookieParser = require('cookie-parser');
var bodyParser = require('body-parser');
var expressHbs = require('express-handlebars');
var {allowInsecurePrototypeAccess} = require('@handlebars/allow-prototype-access')
var Handlebars = require('handlebars');
var mongoose = require('mongoose');
var session = require('express-session');
var flash = require('connect-flash');
var validator = require('express-validator');
var MongoStore = require('connect-mongo');

var routes = require('./routes/index');

var app = express();

mongoose.connect(process.env.MONGODB_URI);

// view engine setup
app.engine('.hbs', expressHbs({defaultLayout: 'layout', extname: '.hbs', handlebars: allowInsecurePrototypeAccess(Handlebars)}));
app.set('view engine', '.hbs');

app.use(favicon(path.join(__dirname, 'public', 'favicon.ico')));
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: true }));
app.use(cookieParser());
app.use(session({
  secret: 'mysupersecret',
  resave: false,
  saveUninitialized: false,
  store: MongoStore.create({ mongoUrl: process.env.MONGODB_URI }),
  cookie: { maxAge: 180 * 60 * 1000 }
}));
app.use(flash());
app.use(express.static(path.join(__dirname, 'public')));

app.use(function(req, res, next) {
    res.locals.session = req.session;
    next();
});

app.use('/', routes);

// catch 404 and forward to error handler
app.use(function(req, res, next) {
  var err = new Error('Not Found');
  err.status = 404;
  next(err);
});

// error handlers

// development error handler
// will print stacktrace
if (app.get('env') === 'development') {
  app.use(function(err, req, res, next) {
    res.status(err.status || 500);
    res.render('error', {
      message: err.message,
      error: err
    });
  });
}

// production error handler
// no stacktraces leaked to user
app.use(function(err, req, res, next) {
  res.status(err.status || 500);
  res.render('error', {
    message: err.message,
    error: {}
  });
});


module.exports = app;