server.js

if(process.env.NODE_ENV !== 'production'){
  require('dotenv').config()
}

const express = require('express')
const mongoose = require('mongoose')
const Article = require('./models/article')
const articleRouter = require('./routes/articles')
const methodOverride = require('method-override')
const app = express()
const bcrypt = require('bcrypt')
const passport = require('passport')
const flash = require('express-flash')
const session = require('express-session')
const expressLayouts = require('express-ejs-layouts')

mongoose.connect('mongodb://localhost/blog',{
    useNewUrlParser: true, useUnifiedTopology: true, useCreateIndex: true
})

const initializePassport = require('./passport-config')

initializePassport(
  passport,
  email =>  users.find(user => user.email === email),
  id => users.find(user => user.id === id)
  )

const users = []

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

app.use(express.urlencoded({ extended: false}))
app.use(methodOverride('_method'))
app.use(flash())
app.use(session({
  secret: process.env.SESSION_SECRET,
  resave: false,
  saveUninitialized: false
}))
app.use(passport.initialize())
app.use(passport.session())

app.get('/',checkAuthenticated , async(req,res)=>{
 const articles = await Article.find().sort({createdAt:'desc'})
 res.render('articles/index',{articles: articles})
})

app.get('/login',checkNotAuthenticated, (req, res) => {
    res.render('login.ejs')
})

app.post('/login',checkNotAuthenticated, passport.authenticate('local', {
 successRedirect: '/',
 failureRedirect: '/login',
 failureFlash: true  
}))

app.get('/register',checkNotAuthenticated, (req, res) => {
    res.render('register.ejs')
})

app.post('/register',checkNotAuthenticated, async (req, res) => {
  try {
    const hashedPassword = await bcrypt.hash(req.body.password, 10)
    users.push({
        id: Date.now().toString(),
        name: req.body.name,
        email: req.body.email,
        password: hashedPassword
    })
    res.redirect('/login')
  } catch {
    res.redirect('/register')
  }
})

app.delete('/logout', (req, res) => {
  req.logOut()
  res.redirect('/login')
})

app.use('/articles', articleRouter)

function checkAuthenticated(req, res, next){
  if (req.isAuthenticated()) {
    return next()
  }
  res.redirect('/login')
}

function checkNotAuthenticated(req, res, next) {
  if (req.isAuthenticated()){
    return res.redirect('/')
  }
  next()
}

app.listen(5000)