[Solved][CKFinder Java] Server source or API

hi, for CKFinder Java, is the Java server side source available for paid users? if not, does the server programs offer any kind of hook or listener API that, e.g. allow us to check the current login user from a ServletRequest and then transfer the list of files in a folder? any doc available?

if the above are not available, do you see any issue if we "hack" the client-server protocol and reimplement the server side program completely? thx