[ARROW-15772] [Go][Flight] Server Basic Auth Middleware/Interceptor wrongly base64 decode

• Type: Bug
• Status: Resolved
• Priority: Major
• Resolution: Fixed
• Affects Version/s: 6.0.1, 7.0.0
• Fix Version/s: 8.0.0
• Component/s: Go
• Labels: easyfix pull-request-available
• External issue URL: https://github.com/apache/arrow/issues/20129
• Assignee: Risselin Corentin
• Reporter: Risselin Corentin
• Created: 24/Feb/22 02:14
• Updated: 11/Jan/23 11:39
• Resolved: 24/Feb/22 17:52

Description

Currently the implementation of the Auth interceptors uses `base64.RawStdEncoding.DecodeString` to decode the content of the hanshake.

In Go RawStdEncoding will not uses padding (with '='), trying to authenticate from pyarrow (with `client.authenticate_basic_token(user, password)`) will result in an error like:

pyarrow._flight.FlightUnauthenticatedError: gRPC returned unauthenticated error, with message: invalid basic auth encoding: illegal base64 data at input byte XX

StdEncoding would successfully read the content if RawStdEncoding fails.

Issue Links

• links to: GitHub Pull Request #12503