server.js

if (!process.env.HEROKU) require('dotenv/config')

var jalla = require('jalla')
var body = require('koa-body')
var dedent = require('dedent')
var compose = require('koa-compose')
var { get, post } = require('koa-route')
var unparsed = require('koa-body/unparsed')
var purge = require('./lib/purge')
var email = require('./lib/email')

var ENDPOINT =
  'https://docs.google.com/forms/d/e/1FAIpQLSdM-T0zn8tIhIy4s4O9D61mGqaezMUvg2Io-dwkWLQe9dKvbg/formResponse'
var app = jalla('index.js', {
  sw: 'sw.js',
  serve: Boolean(process.env.HEROKU)
})

// proxy application form for Google Forms
app.use(
  post(
    '/ansok',
    compose([
      body({ includeUnparsed: true }),
      async function (ctx, next) {
        await fetch(ENDPOINT, {
          method: 'POST',
          headers: {
            'Content-Type': 'application/x-www-form-urlencoded'
          },
          body: ctx.request.body[unparsed]
        })

        var fields = ctx.request.body.entry

        // send an confirmation email
        await email(fields).catch(console.error)

        if (ctx.accepts('html')) {
          ctx.redirect('/tack?contact=' + fields['1183121357'])
        } else {
          ctx.type = 'application/json'
          ctx.body = {}
        }
      }
    ])
  )
)

// disallow robots anywhere but live
app.use(
  get('/robots.txt', function (ctx, next) {
    ctx.type = 'text/plain'
    ctx.body = dedent`
    User-agent: *
    Disallow: ${app.env === 'production' ? '' : '/'}
  `
  })
)

// set headers
app.use(function (ctx, next) {
  if (!ctx.accepts('html')) return next()
  ctx.state.ref = null
  if (app.env !== 'development') {
    ctx.set('Cache-Control', `s-maxage=${60 * 60 * 24 * 30}, max-age=0`)
  }

  return next()
})

app.listen(process.env.PORT || 8080, function () {
  if (process.env.HEROKU && app.env === 'production') {
    purge(['/sw.js'], function (err) {
      if (err) app.emit('error', err)
    })
  }
})