armon/go-socks5 — pull request #1 by bigmartha (2014-02-19 10:18:12+00:00)
Title: Pluggable authentication mechanisms.

Hello,

I am writing a server that will use a custom challenge-response auth scheme, so I was in need of a way to plug my auth code in. This changeset replaces Credentials in the Config with a more generic AuthMethods.

Your call if the extra flexibility is worth the extra complexity though.