GitHub access control

[Peter Schober]

* Brian Moon <bmoon at scu.edu> [2020-07-15 20:13]:
> It sounds like what you need is a "context-check" interceptor flow

This. I was cought up in answering the literal question but if service
access should be disabled (and very likely no proper error message
will be presented by the SP if you happily send the subject on without
any usable data) the above approach obviously is much better.

-peter