OAuth server

A simple services that handles OAuth flow for limited input devices.

It involves the following steps:

App calls the POST https://{server}/initialize endpoint with the OAuth data, this returns a short unique code.
The url with the code in presented in the app interface: e.g. 'Visit https://{server}/ABCD'.
End user visits the url on a device of choice and does all that is required for the OAuth flow.
Finally a callback is made to https://{server}/callback with the OAuth code, this returns a short code.
End user enters the short code in the app on the limited input device.
The app calls https://{server}/code/EFGH to retrieve the OAuth code.

urls

POST /initialize GET /{code} GET /callback/ GET /code/{code}