PSigner - signing Puppet certificates via API

I had a thought the other day about the fact I keep mentioning to people how easy it is to setup a simple web service to sign Puppet certificates via an API. So I thought I’d write a simple prototype to demonstrate how easy. It’s incredibly basic but has scope to be easily extended to do a variety of things and needs better output and cleaner error handling. I called it PSigner and I hope it’s useful to someone.