app.js

// External Dependencies
const express = require('express')
const mongoose = require('mongoose')
const dotenv = require('dotenv')
const path = require('path')
const cookieParser = require('cookie-parser')
const http = require('http')
const moment = require('moment')

// Internal Dependencies:
const {
  notFoundHandler,
  errorHandler,
} = require('./middlewares/common/errorHandler')
const loginRouter = require('./router/loginRouter')
const userRouter = require('./router/userRouter')
const inboxRouter = require('./router/inboxRouter')

// Express Setup:
const app = express()
const server = http.createServer(app)
dotenv.config()

// socket creation
const io = require('socket.io')(server)
global.io = io

// Moment Set as application local for ejs engine:
app.locals.moment = moment

// Database Connection
mongoose
  .connect(process.env.MONGO_CONNECTION_STRING, {
    useNewUrlParser: true,
    useUnifiedTopology: true,
  })
  .then(() => console.log('Successfully Connected To Database!'))
  .catch((error) => console.log(error))

//   Request Parser
app.use(express.json())
app.use(express.urlencoded({ extended: true }))

// Set View Engine
app.set('view engine', 'ejs')

// Set Static Folder
app.use(express.static(path.join(__dirname, 'public')))

// Parse Cookie Data
app.use(cookieParser(process.env.COOKIE_SECRET))

// Routing Setup
app.use('/', loginRouter)
app.use('/users', userRouter)
app.use('/inbox', inboxRouter)

// Not Found Handler
app.use(notFoundHandler)

// Error Handler
app.use(errorHandler)

server.listen(process.env.PORT, () => {
  console.log(`Application listening to port ${process.env.PORT}`)
})