Adding support for custom basic authentication?

Is there some easy way to extend the basic authentication so that i can verify the username and password in code instead of having to hardcode a list of users?
This way it would be easy to check with a Domain controller or some other source.

A callback taking username/password would suffice.

No file, test, or entry point is named in the issue. Start by locating Hangfire's basic authentication implementation and trace how usernames and passwords are currently checked. Done means a callback can verify credentials against an external source such as a domain controller without requiring a hardcoded user list.

Written by the indexing model from the issue text.