Deliver private BackBlaze B2 files through Cloudflare

Guide https://developers.cloudflare.com/workers/tutorials/configure-your-cdn/

Github repo: https://github.com/codewithkristian/assets-on-workers

Configuration

const config = {
  key: B2KeyID,
  secret: B2AppKey,
  bucket: B2BucketName
};

Create new application key at Backblaze fot your bucket. Where key is a key id and secret it is application key. bucket backblaze bucket name B2KeyID, B2AppKey, B2BucketName are environment variables at cloudfare.

const getB2Token = async (config) => {
  const { key, secret } = config;
  const res = await fetch('https://api.backblazeb2.com/b2api/v2/b2_authorize_account', {
    headers: {
      'Authorization': 'Basic ' + btoa(B2KeyID + ":" + B2AppKey)
    }
  });
  const data = await res.json();
  await B2CDN.put('auth', data.authorizationToken);
};

It's a function which gets the authoriztion token to get access to private bucket files.

It is stored at KV namespace B2CDN. For the first time you can get it by command

curl https://api.backblazeb2.com/b2api/v2/b2_authorize_account -u "%key%:%secret%"

getB2Token is attached to scheduled event since token expires every 24 hours. getB2Token gets the token and puts it to KV namespace B2CDN according to triggers configuration at cloudfare

Add custom domain for the worker cdn.example.com

Request

https://cdn.example.com/images/cat.jpg

Original request

https://f004.backblazeb2.com/file/%bucketname%/images/cat.jpg

Upload files to backblaze using B2 cli https://www.backblaze.com/b2/docs/quick_command_line.html

./b2 authorize-account %id% %key%
./b2 sync "d:/files" "b2://bucketname/files"