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60 & 61 & 62 vs. userinfo

1. Petite Abeille (petite.abeille (a) gmail.com)

Currently, the 6x (CLIENT CERTIFICATE REQUIRED) status code range is used 
to maintain states between gemini client and server.

An example is Astrobotany, which uses self-signed certificate and the 
certificate's CommonName as username:

"Register a new account by sending a self-signed certificate ... Your 
certificate's CommonName will be your username..."

https://portal.mozz.us/gemini/astrobotany.mozz.us/

Initially, it was even using certificate signing request, for good measure:

https://portal.mozz.us/gemini/astrobotany.mozz.us/register

This allows Astrobotany to both authenticate & maintain states across gemini requests.

Very nice, high grade authentication and state management to securely 
attend to all our sativa-indica cravings. 

An alternative, elcheapo, workflow, without any need for client 
certificate fiddling, could entail just the userinfo authority bit of an URL:

(1) Request a named token:

C: gemini://astrobotany.mozz.us/.well-known/token?anon -- request a named 
token, at a well known location
S: 30 gemini://anon:token at astrobotany.mozz.us/ -- the server associates 
an opaque token to validate the named user
C: gemini://anon:token at astrobotany.mozz.us/ -- the user-agent 
authenticated with the provided userinfo to maintain its state


(2) (Re)use the named token later on:

C: gemini://anon:token at astrobotany.mozz.us/plant
S: 20 text/gemini; charset=utf-32; lang=tlh-Kore-AQ-fonipa
-OR-
S: 40 Unauthorized. Access token required. Get one at 
gemini://astrobotany.mozz.us/.well-known/acct.

The token can be anything sensible, given what's at stake, e.g. short 
base58 hmac of the name, random number, whatnot.

Workable? Heresy?

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