app.js

const Koa = require('koa')
const app = new Koa()
const views = require('koa-views')
const json = require('koa-json')
const onerror = require('koa-onerror')
const bodyparser = require('koa-bodyparser')
const logger = require('koa-logger')
var cors = require('koa2-cors')

const index = require('./routes/index')
const notification = require('./routes/notification')

// error handler
onerror(app)

// middlewares
app.use(bodyparser({
  enableTypes:['json', 'form', 'text']
}))
app.use(json())
app.use(logger())
app.use(require('koa-static')(__dirname + '/public'))

// views
app.use(views(__dirname + '/views', {
  extension: 'pug'
}))

// cors
app.use(cors({
  origin: '*',
  allowMethods: ['GET', 'PUT', 'POST', 'PATCH', 'DELETE', 'HEAD', 'OPTIONS']
}))

// logger
app.use(async (ctx, next) => {
  const start = new Date()
  await next()
  const ms = new Date() - start
  console.log(`${ctx.method} ${ctx.url} - ${ms}ms`)
})

// errors response
app.use(async (ctx, next) => {
  try {
    await next()
  } catch (err) {
    ctx.status = err.statusCode || err.status || 500
    ctx.response.body = {
      ERROR_CODE: 'ERROR',
      ERROR_INFO: err
    }
  }
})

// routes
app.use(index.routes(), index.allowedMethods())
app.use(notification.routes(), notification.allowedMethods())

// error-handling
app.on('error', (err, ctx) => {
  console.error('server error', err, ctx)
});

module.exports = app