mod_http_oauth2: Record hash of client_id to allow future verification RFC 6819 section 5.2.2.2 states that refresh tokens MUST be bound to the client. In order to do that, we must record something that can definitely tie the client to the grant. Since the full client_id is so large (why we have this client_subset function), a hash is stored instead.

---
summary: Store authentication events in the audit log
rockspec:
  dependencies:
  - mod_audit
...

This module stores authentication failures and authentication successes in the
audit log provided by `mod_audit`.