app.js

const express = require('express')
const exphbs = require('express-handlebars')
const app = express()
const mongoose = require('mongoose')
const hostname = '127.0.0.1'
const port = 3000
const bodyParser = require('body-parser')
const fileUpload = require('express-fileupload')
const {generateDate, limit, truncate, paginate} = require('./helpers/hbs')
const expressSession = require('express-session')
const connectMongo = require('connect-mongo')
const methodOverride = require('method-override')

mongoose.connect('mongodb://127.0.0.1:27017/nodeblog_db', {
    useNewUrlParser: true,
    useUnifiedTopology: true,
    useCreateIndex: true
})

const mongoStore = connectMongo(expressSession)

app.use(expressSession ({
    secret: 'ThisisaverysecretkeY123!',
    resave: true,
    saveUninitialized: true,
    store: new mongoStore({ mongooseConnection: mongoose.connection })
}))

app.use(fileUpload())

app.use(express.static('public'))
app.use(methodOverride('_method'))

//handlebars helpers
const hbs = exphbs.create({
    helpers: {
        generateDate: generateDate,
        limit: limit,
        truncate: truncate,
        paginate: paginate
    }
})

app.engine('handlebars', hbs.engine)
app.set('view engine', 'handlebars')

app.use(bodyParser.urlencoded({extended: true}))
app.use(bodyParser.json())

// Display Link Middleware
app.use((req, res, next) => {
    const {userId} = req.session
    if (userId) {
        res.locals = {
            displayLink: true
        }
    } else {
        res.locals = {
            displayLink: false
        }
    }
    next()
})

// Flash - Message Middleware
app.use((req, res, next) => {
    res.locals.sessionFlash = req.session.sessionFlash
    delete req.session.sessionFlash
    next()
})

const main = require('./routes/main')
const posts = require('./routes/posts')
const users = require('./routes/users')
const admin = require('./routes/admin/index')
const contact = require('./routes/contact')

const {MongoStore} = require("connect-mongo");
app.use('/', main)
app.use('/posts', posts)
app.use('/users', users)
app.use('/admin', admin)
app.use('/contact', contact)

app.listen(port, hostname, () => {
    console.log(`Server started on port http://${hostname}:${port}`)
})