anchor.diff:  -spec(add_bucket(binary(), binary()) ->
                ok | {error, any()}).
   add_bucket(AccessKey, Bucket) ->
  +    % default set to private
  +    add_bucket(AccessKey, Bucket, ?CANNED_ACL_PRIVATE).
  +
  +-spec(add_bucket(binary(), binary(), string()) ->
  +             ok | {error, any()}).
  +add_bucket(AccessKey, Bucket, CannedACL) ->
       AccessKeyBin = case is_binary(AccessKey) of
                          true  -> AccessKey;
                          false -> list_to_binary(AccessKey)
  
positive.code:             {error, ?ERROR_NOT_SATISFY_CONDITION}
      end.
  
  add_bucket_1(AccessKeyBin, BucketBin) ->
      case leo_s3_bucket:put(AccessKeyBin, BucketBin) of
          ok ->
              rpc_call_for_gateway(add_bucket, [AccessKeyBin, BucketBin, undefined]);
          {error, badarg} ->
              {error, ?ERROR_INVALID_BUCKET_FORMAT};
          {error, _Cause} ->
  
negative.code:          notify/3, notify/4, purge/1, remove/1,
           whereis/2, recover/3, compact/2, compact/4, stats/2,
           synchronize/1, synchronize/2, synchronize/3,
           set_endpoint/1, delete_endpoint/1, add_bucket/2, add_bucket/3, delete_bucket/2,
           update_acl/3
          ]).
  
  