Authorize Cloudflare to access Backblaze private buckets

backblaze.js

addEventListener("fetch", (event) => {
  event.respondWith(
    handleRequest(event.request).catch(
      (err) => new Response(err.stack, { status: 500 })
    )
  );
});

async function handleRequest(request) {
  const { pathname } = new URL(request.url);

  if (pathname.startsWith("/postlife")) {
    const response = await fetch('https://f002.backblazeb2.com/file'+ pathname, {
      headers: {
        Authorization: B2_DOWNLOAD_TOKEN
      }
    })
    return response;
  }

  return new Response("Unauthorized", {status: 401});
}

update_bb_dl_token.js

/**
 * Environment variables to declare for this worker:
 * BB_API_TOKEN: Backblaze API token 
 * = (The application key id and application key are combined into a string in the format base64("applicationKeyId:applicationKey").
 * BB_BUCKET_ID: Backblaze bucketId
 * CLOUDFLARE_TOKEN: CLOUDFLARE API TOKEN WITH EDIT PERMISSION ON WORKER
 */

addEventListener("scheduled", (event) => {
  event.waitUntil(
    handleSchedule(event.scheduledTime)
  )
});

async function authorizeAccount() {
  const response = await fetch('https://api.backblazeb2.com/b2api/v2/b2_authorize_account', {
    headers: {
      Authorization: 'Basic ' + BB_API_TOKEN
    }
  })
  return await response.json();
}

async function getDownloadAuthorization(dlApiUrl, authorizationToken) {
  const response = await fetch( dlApiUrl +'/b2api/v2/b2_get_download_authorization', {
    method: 'POST',
    headers: {
      Authorization: authorizationToken,
    },
    body: JSON.stringify({
      "bucketId": BB_BUCKET_ID,
      "fileNamePrefix": "",
      "validDurationInSeconds": 7*24*60*60
    })
  })

  return await response.json();
}

async function deleteBBSecret() {
  const response = await fetch('https://api.cloudflare.com/client/v4/accounts/'+CLOUDFLARE_ID+'/workers/scripts/backblaze/secrets/B2_DOWNLOAD_TOKEN', {
    method: 'DELETE',
    headers: {
      Authorization: 'Bearer ' + CLOUDFLARE_TOKEN
    }
  });
  console.log(await response.json())
}

async function updateBBSecret(bbToken) {
  const response = await fetch('https://api.cloudflare.com/client/v4/accounts/'+CLOUDFLARE_ID+'/workers/scripts/backblaze/secrets', {
    method: 'PUT',
    headers: {
      Authorization: 'Bearer ' + CLOUDFLARE_TOKEN
    },
    body: JSON.stringify({
      "type": "secret_text",
      "text": bbToken,
      "name": "B2_DOWNLOAD_TOKEN"
    })
  });
  console.log(await response.json())
}


async function handleSchedule(request) {
  const bbAuthorizeAccount = await authorizeAccount();
  const {authorizationToken} = await getDownloadAuthorization(bbAuthorizeAccount.apiUrl, bbAuthorizeAccount.authorizationToken);
  // await deleteBBSecret();
  await updateBBSecret(authorizationToken);

  return new Response("OK", {status: 200});

}