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elm-auth

This is an API specification for authentication of Elm apps.

The idea here is to capture the interaction with a typical authentication API as an Elm package and to present that as a simpler API that applications need authentication can make use of. The core of the API is the authentication commands, which are:

login : Credentials -> Cmd msg
refresh : Cmd msg
logout : Cmd msg
unauthed : Cmd msg

The commands yield messages that must be given to an update function which has this signature and related types:

type Status chal
    = Failed
    | Challenged chal
    | LoggedOut
    | LoggedIn
        { scopes : List String
        , subject : String
        }

update : msg -> model -> ( model, Cmd msg, Maybe (Status chal))

That is, each message will update the internal model, and may produce a change to the current authentication status.

more things an API needs to do

• Add auth info to an HTTP header.
• Answer challenges. 'chal' can be Never.
• Sign up new users.
• Verification links.