[keycloak-user] Get the user of the current request from the KeycloakSession?

Seems like a simple scenario, but I can't figure it out: I have an instance of the KeycloakSession and I want to get the UserModel for the current request. Is this possible? Context: I'm creating a custom REST service that runs inside keycloak and needs to get some data that is related to the current authenticated user. For instance the realm and client I can get through the session.getContext().getClient/Realm(). I would expect a getUser() there too, but I can't find it anywhere 'in' the session. If this isn't possible, shouldn't it be? Or if not, why not?