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/*
This file is part of GNU Taler
(C) 2022-2024 Taler Systems S.A.
GNU Taler is free software; you can redistribute it and/or modify it under the
terms of the GNU General Public License as published by the Free Software
Foundation; either version 3, or (at your option) any later version.
GNU Taler is distributed in the hope that it will be useful, but WITHOUT ANY
WARRANTY; without even the implied warranty of MERCHANTABILITY or FITNESS FOR
A PARTICULAR PURPOSE. See the GNU General Public License for more details.
You should have received a copy of the GNU General Public License along with
GNU Taler; see the file COPYING. If not, see <http://www.gnu.org/licenses/>
*/
import {
AccessToken,
Codec,
buildCodecForObject,
buildCodecForUnion,
codecForBoolean,
codecForConstString,
codecForString,
} from "@gnu-taler/taler-util";
import { buildStorageKey, useLocalStorage } from "@gnu-taler/web-util/browser";
import { mutate } from "swr";
/**
* Has the information to reach and
* authenticate at the bank's backend.
*/
export type SessionState = LoggedIn | LoggedOut | Expired;
interface LoggedIn {
status: "loggedIn";
isUserAdministrator: boolean;
username: string;
token: AccessToken;
}
interface Expired {
status: "expired";
isUserAdministrator: boolean;
username: string;
}
interface LoggedOut {
status: "loggedOut";
}
export const codecForSessionStateLoggedIn = (): Codec<LoggedIn> =>
buildCodecForObject<LoggedIn>()
.property("status", codecForConstString("loggedIn"))
.property("username", codecForString())
.property("token", codecForString() as Codec<AccessToken>)
.property("isUserAdministrator", codecForBoolean())
.build("SessionState.LoggedIn");
export const codecForSessionStateExpired = (): Codec<Expired> =>
buildCodecForObject<Expired>()
.property("status", codecForConstString("expired"))
.property("username", codecForString())
.property("isUserAdministrator", codecForBoolean())
.build("SessionState.Expired");
export const codecForSessionStateLoggedOut = (): Codec<LoggedOut> =>
buildCodecForObject<LoggedOut>()
.property("status", codecForConstString("loggedOut"))
.build("SessionState.LoggedOut");
export const codecForSessionState = (): Codec<SessionState> =>
buildCodecForUnion<SessionState>()
.discriminateOn("status")
.alternative("loggedIn", codecForSessionStateLoggedIn())
.alternative("loggedOut", codecForSessionStateLoggedOut())
.alternative("expired", codecForSessionStateExpired())
.build("SessionState");
export const defaultState: SessionState = {
status: "loggedOut",
};
export interface SessionStateHandler {
state: SessionState;
logOut(): void;
expired(): void;
logIn(info: { username: string; token: AccessToken }): void;
}
const SESSION_STATE_KEY = buildStorageKey("bank-session", codecForSessionState());
/**
* Return getters and setters for
* login credentials and backend's
* base URL.
*/
export function useSessionState(): SessionStateHandler {
const { value: state, update } = useLocalStorage(
SESSION_STATE_KEY,
defaultState,
);
return {
state,
logOut() {
update(defaultState);
},
expired() {
if (state.status === "loggedOut") return;
const nextState: SessionState = {
status: "expired",
username: state.username,
isUserAdministrator: state.username === "admin",
};
update(nextState);
},
logIn(info) {
// admin is defined by the username
const nextState: SessionState = {
status: "loggedIn",
...info,
isUserAdministrator: info.username === "admin",
};
update(nextState);
cleanAllCache();
},
};
}
function cleanAllCache(): void {
mutate(() => true, undefined, { revalidate: false });
}
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