It seems the author of the repo wrote a new implementation of the backend but copied the code from the frontend. I dislike the DMCA process and I find some other stuff in the complaint I disagree with but it seems like the repository was infringing.
It used this for the server side: https://github.com/OgarProject/Ogar
http://webcache.googleusercontent.com/search?q=cache:i6GrF7V...