How to create rate limit on custom plugin based on field in the HTTP header?

[irfansofyana]

Hi everyone! I need help for my use case.

At the moment, I have a custom plugin that doing authentication to our internal service outside TYK. We have an identifier of who created the request in X-PARTNER-ID header, at the moment our custom plugin looks like this:

// doing http call to our internal auth service here

// inject session
session := &user.SessionState{
  MetaData: map[string]interface{}{
	"partner-id": r.Header.Get("X-PARTNER-ID"),
  },
}

ctx.SetSession(r, session, true)

from the code above, is it possible to add custom rate limit but it should be based on the partner-id field? I don't want it to be a global rate limit and should be based per partner-id