Add support for AUTH with user + password introduced in Redis 6

[tgrall]

Feature Request

In Redis 6 it is now possible to authenticate either using a simple password (legacy) or using a user + password

AUTH secret
AUTH default secret

See ACL documentation section in Redis Doc

Is your feature request related to a problem? Please describe

No

Describe the solution you'd like

Just support new features of Redis 6

Describe alternatives you've considered

No alternative,

Teachability, Documentation, Adoption, Migration Strategy

Adding new parameter to the auth() method and URIs

[mikebell90]

While it would be hacky and awkward, can't you specify the password as a two part atom - userpassword. I haven't checked the parser to see if this is an issue.

[mp911de]

The format user:password applies only to RedisURI. We should introduce for Lettuce a dedicated overload (auth(String username, CharSequence password)). Any kind of separator char would clash with valid Redis passwords.

[mikebell90]

I would go so far as to say considering creating an

auth(Principal principal) abstraction, with overloads for the username only and username/password is a better abstraction?

[gkorland]

@mp911de what the release plan for this issue? since Redis 6 is backward compatible with RESP2 I don't think this issue should be blocked by the RESP3 implementation.

[mp911de]

I was a bit reluctant on releasing a first milestone as Redis 6's Sentinel with RESP3 (redis/redis#6160) creates an impediment for RESP3 usage. Lettuce 6 attempts a RESP3 handshake by default and so the default behavior renders Sentinel arrangements unusable.