WebSpa is a Java client/server implementation for sending a single HTTP request in order to authorise a system command to be executed server-side for a particular user.

This is equivalent to port-knocking on the web layer, but with much more control: All commands must be pre-defined and have a time-window of execution. Whatsmore, all users have to be registered and authorised to run any given action.

Finally, in an attempt to mirror the operation of Single Packet Authorisation (SPA), the entirety of a user's action is submitted through a single web request.

We think this project carries some novelty in its approach and hope you find it of value.