code: def user_s3_bucket(canonical_user_id=None):
      
      s3 = _s3_resource()
      if not canonical_user_id:
          canonical_user_id = _get_canonical_aws_user_id(s3)
  
      s3_bucket_name = "dallinger-{}".format(
          hashlib.sha256(canonical_user_id.encode("utf8")).hexdigest()[0:8]
      )
  
      return _get_or_create_s3_bucket(s3, s3_bucket_name)
docs: Get the user's S3 bucket.