Hi, I'm interested in the feature and I would like to contribute to do a pull request to the keycloak project. My first Idea is to implement a new "RequestAuthenticator" just like the BasicAuthRequestAuthenticator and to handle the request inside the method RequestAuthenticator.authenticate(). Does it run in the right direction? If yes, I would like to create a pull request for further discussions.... If not any other comment or tip is welcome! Regards Christian