[DiabloD3]

This is not what I want in an OAuth provider.

Instead, someone should write a simple daemon I can execute http+json REST functions on to create and verify login cookies and transfer them back and forth to the user's browser using my webapp normally.

The daemon can be written in any language as long as it is not a JVM language.

I would write such a thing, but OAuth is somewhat confusing, and OAuth.io brings up a good point, a lot of the existing OAuth implementations are a bit flaky and if I just copy what they do/use them directly I risk inheriting that problem.