### Authorization protocol fragment, based on OAuth2 (RFC 6749).
###
### Copyright 2018 Alceste Scalas <alceste.scalas @ imperial.ac.uk>
### Released under the MIT License: https://opensource.org/licenses/MIT

server→client:{
  login  . client→auth:passwd(Str) . auth→server:auth(Bool) . end,
  cancel . client→auth:quit . end
}