app.js

const express = require('express')
const app = express()
require('dotenv').config()
const multer = require('multer')
const upload = multer()
const session = require('express-session')
const flash = require('express-flash')
const passport = require('passport')
require('./config/passport') // entire passport config module 
const connection = require('./config/connectDB')
const router = require('./routes/router')
const notFound = require('./middleware/notFound')
const errorHandler = require('./middleware/errorHandler')

const setLocals = require('./middleware/setLocals')
const sessionOptions = require('./config/session')

app.set('view engine', 'ejs')

// --- MIDDLEWARE ---

// for parsing application/json
app.use(express.json())

// for parsing application/x-www-form-urlencoded -- HTML form submit
app.use(express.urlencoded({extended : false}))

// for parsing multipart/form-data -- FormData with ajax
app.use(upload.array())

app.use(express.static('views'))

// express-session
app.use(session(sessionOptions))

// express-flash (show flash messages from passport.authenticate)
app.use(flash())

// passport-local auth
app.use(passport.initialize())
app.use(passport.session())

// variables for dynamic views
app.use(setLocals)

//routes
app.use('/', router)

// not-found
app.use(notFound)

//error handler
app.use(errorHandler)

const port = process.env.PORT || 3000

app.listen(port, () => console.log(`App is listening on port ${port}...`))