112 lines
1.8 KiB
Elm
112 lines
1.8 KiB
Elm
port module Session
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exposing
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( Session
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, changes
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, cred
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, decode
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, login
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, logout
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, navKey
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, viewer
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)
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import Browser.Navigation as Nav
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import Json.Decode as Decode exposing (Decoder)
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import Json.Decode.Pipeline exposing (custom, required)
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import Json.Encode as Encode exposing (Value)
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import Profile exposing (Profile)
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import Time
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import Viewer exposing (Viewer)
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import Viewer.Cred as Cred exposing (Cred)
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-- TYPES
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type Session
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= LoggedIn Nav.Key Viewer
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| Guest Nav.Key
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-- INFO
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viewer : Session -> Maybe Viewer
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viewer session =
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case session of
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LoggedIn _ val ->
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Just val
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Guest _ ->
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Nothing
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cred : Session -> Maybe Cred
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cred session =
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Maybe.map Viewer.cred (viewer session)
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navKey : Session -> Nav.Key
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navKey session =
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case session of
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LoggedIn key _ ->
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key
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Guest key ->
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key
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-- LOGIN
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login : Viewer -> Cmd msg
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login newViewer =
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Viewer.encode newViewer
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|> Encode.encode 0
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|> Just
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|> storeSession
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-- LOGOUT
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logout : Cmd msg
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logout =
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storeSession Nothing
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port storeSession : Maybe String -> Cmd msg
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-- CHANGES
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changes : (Session -> msg) -> Nav.Key -> Sub msg
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changes toMsg key =
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onSessionChange (\val -> toMsg (decode key val))
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port onSessionChange : (Value -> msg) -> Sub msg
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decode : Nav.Key -> Value -> Session
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decode key value =
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-- It's stored in localStorage as a JSON String;
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-- first decode the Value as a String, then
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-- decode that String as JSON.
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case
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Decode.decodeValue Decode.string value
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|> Result.andThen (Decode.decodeString Viewer.decoder)
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|> Result.toMaybe
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of
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Just decodedViewer ->
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LoggedIn key decodedViewer
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Nothing ->
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Guest key
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