2 files changed, 177 insertions, 0 deletions
diff --git a/packages/challenger-ui/src/hooks/challenge.ts b/packages/challenger-ui/src/hooks/challenge.ts
new file mode 100644
index 000000000..3df10e21e
--- /dev/null
+++ b/packages/challenger-ui/src/hooks/challenge.ts
@@ -0,0 +1,58 @@
+/*
+ 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 {
+  ChallengerResultByMethod,
+  TalerHttpError,
+} from "@gnu-taler/taler-util";
+import { useChallengerApiContext } from "@gnu-taler/web-util/browser";
+import _useSWR, { SWRHook, mutate } from "swr";
+import { SessionId } from "./session.js";
+const useSWR = _useSWR as unknown as SWRHook;
+
+export function revalidateChallengeSession() {
+  return mutate(
+    (key) => Array.isArray(key) && key[key.length - 1] === "login",
+    undefined,
+    { revalidate: true },
+  );
+}
+
+export function useChallengeSession(
+  nonce: string,
+  session: SessionId | undefined,
+) {
+  const {
+    lib: { bank: api },
+  } = useChallengerApiContext();
+
+  async function fetcher([n, c, r, s]: [string, string, string, string]) {
+    return await api.login(n, c, r, s);
+  }
+  const { data, error } = useSWR<
+    ChallengerResultByMethod<"login">,
+    TalerHttpError
+  >(
+    !session
+      ? undefined
+      : [nonce, session.clientId, session.redirectURL, session.state, "login"],
+    fetcher,
+    {},
+  );
+
+  if (data) return data;
+  if (error) return error;
+  return undefined;
+}
diff --git a/packages/challenger-ui/src/hooks/session.ts b/packages/challenger-ui/src/hooks/session.ts
new file mode 100644
index 000000000..4bb1bfbc8
--- /dev/null
+++ b/packages/challenger-ui/src/hooks/session.ts
@@ -0,0 +1,119 @@
+/*
+ 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 {
+  Codec,
+  buildCodecForObject,
+  codecForBoolean,
+  codecForNumber,
+  codecForString,
+  codecForStringURL,
+  codecForURL,
+  codecOptional,
+} 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 SessionId = {
+  clientId: string;
+  redirectURL: string;
+  state: string;
+};
+
+export type LastChallengeResponse = {
+  attemptsLeft: number;
+  nextSend: string;
+  transmitted: boolean;
+};
+
+export type SessionState = SessionId & {
+  email: string | undefined;
+  lastTry: LastChallengeResponse | undefined;
+  completedURL: string | undefined;
+};
+export const codecForLastChallengeResponse = (): Codec<LastChallengeResponse> =>
+  buildCodecForObject<LastChallengeResponse>()
+    .property("attemptsLeft", codecForNumber())
+    .property("nextSend", codecForString())
+    .property("transmitted", codecForBoolean())
+    .build("LastChallengeResponse");
+
+export const codecForSessionState = (): Codec<SessionState> =>
+  buildCodecForObject<SessionState>()
+    .property("clientId", codecForString())
+    .property("redirectURL", codecForStringURL())
+    .property("completedURL", codecOptional(codecForStringURL()))
+    .property("state", codecForString())
+    .property("lastTry", codecOptional(codecForLastChallengeResponse()))
+    .property("email", codecOptional(codecForString()))
+    .build("SessionState");
+
+export interface SessionStateHandler {
+  state: SessionState | undefined;
+  start(s: SessionId): void;
+  accepted(e: string, l: LastChallengeResponse): void;
+  completed(e: URL): void;
+}
+
+const SESSION_STATE_KEY = buildStorageKey(
+  "challenger-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);
+
+  return {
+    state,
+    start(info) {
+      update({
+        ...info,
+        lastTry: undefined,
+        completedURL: undefined,
+        email: undefined,
+      });
+      cleanAllCache();
+    },
+    accepted(email, lastTry) {
+      if (!state) return;
+      update({
+        ...state,
+        email,
+        lastTry,
+      });
+    },
+    completed(url) {
+      if (!state) return;
+      update({
+        ...state,
+        completedURL: url.href,
+      });
+    },
+  };
+}
+
+function cleanAllCache(): void {
+  mutate(() => true, undefined, { revalidate: false });
+}