Cloudflare Workers simple key value database

index.ts

declare const KV: KVNamespace

addEventListener('fetch', event => event.respondWith(handleRequest(event.request)))

const handleRequest = async (request: Request): Promise<Response> => {
  if (!auth(request)) {
    return new Response('Forbidden', { status: 403 })
  }

  const key = new URL(request.url).pathname.substr(1)

  if (request.method === 'PUT') {
    const data = await request.text()
    await KV.put(key, JSON.stringify({data: data}))
    return new Response()
  }

  if (request.method === 'GET') {
    const res = await KV.get(key)
    if (res) {
      return new Response(JSON.parse(res).data)
    } else {
      return new Response('', {status: 404})
    }
  }

  return new Response('', {status: 400})
}

const auth = (request: Request) : boolean => {
  const Authorization = request.headers.get('Authorization') || ''
  const [scheme, encoded] = Authorization.split(' ')
  if (!encoded || scheme !== 'Basic') {
    return false
  }
  const buffer = Uint8Array.from(atob(encoded), character => character.charCodeAt(0))
  const decoded = new TextDecoder().decode(buffer).normalize()
  const index = decoded.indexOf(':')
  if (index === -1 || /[\0-\x1F\x7F]/.test(decoded)) {
    return false
  }
  const auth = {
    user: decoded.substring(0, index),
    pass: decoded.substring(index + 1),
  }
  return auth.user === 'secret' && auth.pass === 'secret'
}