Are you (planning on) integrating with #SAML in your #Clojure web service?
I made this library that turns a Pedestal web service into a SAML Service Provider: https://github.com/kuhumcst/pedestal-sp
It is actually pretty nice. The best part is that you don't have to use #Shibboleth at all. The second best part is the decoupled way that you handle authorisation at different levels, both frontend and backend.