[CalendarServer-dev] How can I make a new directory service?

I want to make my own directory service for my purpose. I read the code (directory.py and xmlfile.py) and understand that I must make class that extends DirectoryService and DirectoyRecord. Am I correct? Which files that use my code? I can't find the source files that manage about authentication? The one I just found is config.py that details about config file. Can anyone tell me about that? Thank you. Yours sincerely.