log / cloudflare worker basic auth middleware

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

async function handleRequest(request) {
  const NAME = AUTH_USERNAME // env variable
  const PASS = AUTH_PASSWORD // env variable

  const headers = new Headers({
    'WWW-Authenticate': 'Basic realm="User Visible Realm"',
  })

  const authorization = request.headers.get('Authorization')
  if (!authorization) {
    return new Response('Unauthorized', {
      status: 401,
      headers: headers
    })
  }

  const encoded = authorization.split(' ')[1]
  const decoded = atob(encoded)
  const credentials = decoded.split(':')

  if (credentials[0] !== NAME || credentials[1] !== PASS) {
    return new Response('Invalid credentials', {
      status: 401,
      headers: headers
    })
  }

  return fetch(request)
}