Worker subdomain to S3 path

worker.js

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

/**
 * Respond to the request
 * @param {Request} request
 */
async function handleRequest(request) {
  let url = new URL(request.url)
  let subdomain = url.hostname.split('.')[0]

  url.hostname = 's3-eu-west-1.amazonaws.com'
  url.pathname = 'bucket-2324324242' + '/' + subdomain + '/' + url.pathname

  return fetch(url, request)
}