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Please keep the discussion on the mailing list rather than commenting on the wiki (wiki discussions get unwieldy fast).

Motivation

Describe the problems you are trying to solve.

Kafka currently supports non-configurable SASL extensions in its SCRAM authentication protocol for delegation token validation. It would be useful to provide configurable SASL extensions for the OAuthBearer authentication mechanism as well, such that clients could attach arbitrary data for the principal authenticating into Kafka. This way, a custom principal can hold information derived from the authentication mechanism, which could prove useful for better tracing and troubleshooting, for example. This can be done in a way which allows for easier extendability in future SASL mechanisms.

Public Interfaces

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`SaslExtensions` class - encapsulates extensions and parses them to/from strings

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