Hey guys,
I just thought I would share a gem that I have written to integrate with the Moodle external services module. It's a ruby gem that exposes all the services available. Token generation included. It's still under development, but most of the functionality we are looking for is there. Hoping to slow down any development once our stress testing is complete.
https://github.com/get-smarter/moodle-api
Feedback is welcome via logging an issue in github.