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

// use 'helmet' for security configuration
var helmet = require('helmet')

// use mongoose for object modeling
var mongoose = require('mongoose');

// use passport as authentication middleware
var passport = require('passport');
var LocalStrategy = require('passport-local').Strategy;

var app = express();

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

// uncomment after placing your favicon in /public
app.use(favicon(path.join(__dirname, 'build', 'favicon.png')));

// invoke middleware needed
app.use(helmet());
app.use(logger('dev'));
app.use(bodyParser.json());
app.use(bodyParser.urlencoded({ extended: false }));
app.use(cookieParser());
app.use(require('express-session')({
  secret: 'keyboard cat',
  resave: false,
  saveUninitialized: false
}));
app.use(passport.initialize());
app.use(passport.session());

app.use('/', index);
// app.use('/users', users);

//ZC: router will be called first and, if no middleware handles the request, then express will call static files 
app.use(express.static(path.join(__dirname, 'build')));

// config passport
var User =  require('./models/user');
passport.use(new LocalStrategy(User.authenticate()));
passport.serializeUser(User.serializeUser());
passport.deserializeUser(User.deserializeUser());

// mongoose data source
mongoose.connect('mongodb://localhost/vm_db');

// 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 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;