app.js

const createError = require('http-errors')
const express = require('express')
const path = require('path')
const cookieParser = require('cookie-parser')
const logger = require('morgan')
const session = require('express-session')
const methodOverride = require('method-override')
var multer = require('multer')
const fs = require('fs');

const homeRouter = require('./routes/home')
const postsRouter = require('./routes/posts')
const sessionsRouter = require('./routes/sessions')
const usersRouter = require('./routes/users')

const app = express()

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

app.use(logger('dev'))
app.use(express.json())
app.use(express.urlencoded({ extended: true }))
app.use(cookieParser())
app.use(express.static(path.join(__dirname, 'public')))
app.use(methodOverride('_method'))

app.use(
  session({
    key: 'user_sid',
    secret: 'super_secret',
    resave: false,
    saveUninitialized: false,
    cookie: {
      expires: 600000
    }
  })
)

// clear the cookies after user logs out
app.use((req, res, next) => {
  if (req.cookies.user_sid && !req.session.user) {
    res.clearCookie('user_sid')
  }
  next()
})

// middleware function to check for logged-in users
const sessionChecker = (req, res, next) => {
  if (!req.session.user && !req.cookies.user_sid) {
    res.redirect('/sessions/new')
  } else {
    next()
  }
}

var storage = multer.diskStorage({
  destination: (req,file, cb) => {
    cb(null, 'uploads')
  },
  filename: (req, file, cb) => {
    cb(null, file.fieldname + '-' + Date.now())
  }
});

var upload = multer({ storage: storage});


// route setup
app.use('/', homeRouter)
app.use('/posts', sessionChecker, postsRouter)
app.use('/sessions', sessionsRouter)
app.use('/users', usersRouter)

// catch 404 and forward to error handler
app.use((req, res, next) => {
  next(createError(404))
})

// error handler
app.use((err, req, res) => {
  // 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