app.js

let createError = require('http-errors');
let express = require('express');
let path = require('path');
let cookieParser = require('cookie-parser');
let logger = require('morgan');

//module for authentication
let session = require('express-session');
let passport = require('passport');
let passportLocal = require('passport-local');
let localStrategy = passportLocal.Strategy;
let flash = require('connect-flash');

//database set up
let mongoose = require('mongoose');
let DB = require('./config/db');

//point Mongoose to the database uri
mongoose.connect(DB.URI);

let mongoDB = mongoose.connection;
mongoDB.on('error', console.error.bind(console, 'Connection error:'));
mongoDB.once('open', ()=> {
  console.log("Connected to MongoDB");
});

let indexRouter = require('./routes/index');


let contactRouter = require('./routes/contact');

let app = express();

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

app.use(logger('dev'));
app.use(express.json());
app.use(express.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(express.static(path.join(__dirname, 'public')));
app.use(express.static(path.join(__dirname, 'node_modules')));

//set up express session
app.use(session({
  secret: "Some secret",
  saveUninitialized: false,
  resave: false
}));

//initialize flash
app.use(flash());

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

//passport user configuration
 
//create a user model
let userModel = require('./model/user');
let User = userModel.User;
//implement a User authentication strategy
passport.use(User.createStrategy());

//serialize and deserialize the user info
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());



app.use('/', indexRouter);

app.use('/contact-list', contactRouter);


// 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');
});

module.exports = app;