1 files changed, 163 insertions, 0 deletions
diff --git a/packages/aml-backoffice-ui/src/hooks/officer.ts b/packages/aml-backoffice-ui/src/hooks/officer.ts
new file mode 100644
index 000000000..1bb73b8fc
--- /dev/null
+++ b/packages/aml-backoffice-ui/src/hooks/officer.ts
@@ -0,0 +1,163 @@
+/*
+ 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 {
+  AbsoluteTime,
+  Codec,
+  LockedAccount,
+  OfficerAccount,
+  OfficerId,
+  OperationOk,
+  SigningKey,
+  buildCodecForObject,
+  codecForAbsoluteTime,
+  codecForString,
+  createNewOfficerAccount,
+  decodeCrock,
+  encodeCrock,
+  opFixedSuccess,
+  unlockOfficerAccount,
+} from "@gnu-taler/taler-util";
+import { buildStorageKey, useExchangeApiContext, useLocalStorage } from "@gnu-taler/web-util/browser";
+import { useMemo } from "preact/hooks";
+import { usePreferences } from "./preferences.js";
+
+export interface Officer {
+  account: LockedAccount;
+  when: AbsoluteTime;
+}
+
+const codecForLockedAccount = codecForString() as Codec<LockedAccount>;
+
+type OfficerAccountString = {
+  id: string;
+  strKey: string;
+};
+
+export const codecForOfficerAccount = (): Codec<OfficerAccountString> =>
+  buildCodecForObject<OfficerAccountString>()
+    .property("id", codecForString()) // FIXME
+    .property("strKey", codecForString()) // FIXME
+    .build("OfficerAccount");
+
+export const codecForOfficer = (): Codec<Officer> =>
+  buildCodecForObject<Officer>()
+    .property("account", codecForLockedAccount) // FIXME
+    .property("when", codecForAbsoluteTime) // FIXME
+    .build("Officer");
+
+export type OfficerState = OfficerNotReady | OfficerReady;
+export type OfficerNotReady = OfficerNotFound | OfficerLocked;
+interface OfficerNotFound {
+  state: "not-found";
+  create: (password: string) => Promise<OperationOk<OfficerId>>;
+}
+interface OfficerLocked {
+  state: "locked";
+  forget: () => OperationOk<void>;
+  tryUnlock: (password: string) => Promise<OperationOk<void>>;
+}
+interface OfficerReady {
+  state: "ready";
+  account: OfficerAccount;
+  forget: () => OperationOk<void>;
+  lock: () => OperationOk<void>;
+}
+
+const OFFICER_KEY = buildStorageKey("officer", codecForOfficer());
+const DEV_ACCOUNT_KEY = buildStorageKey(
+  "account-dev",
+  codecForOfficerAccount(),
+);
+
+export function useOfficer(): OfficerState {
+  const {lib:{exchange: api}} = useExchangeApiContext();
+  const [pref] = usePreferences();
+  pref.keepSessionAfterReload;
+  // dev account, is kept on reloaded.
+  const accountStorage = useLocalStorage(DEV_ACCOUNT_KEY);
+  const account = useMemo(() => {
+    if (!accountStorage.value) return undefined;
+
+    return {
+      id: accountStorage.value.id as OfficerId,
+      signingKey: decodeCrock(accountStorage.value.strKey) as SigningKey,
+    };
+  }, [accountStorage.value?.id, accountStorage.value?.strKey]);
+
+  const officerStorage = useLocalStorage(OFFICER_KEY);
+  const officer = useMemo(() => {
+    if (!officerStorage.value) return undefined;
+    return officerStorage.value;
+  }, [officerStorage.value?.account, officerStorage.value?.when.t_ms]);
+
+  if (officer === undefined) {
+    return {
+      state: "not-found",
+      create: async (pwd: string) => {
+        const resp = await api.getSeed()
+        const extraEntropy = resp.type === "ok" ? resp.body : new Uint8Array();
+
+        const { id, safe, signingKey } = await createNewOfficerAccount(
+          pwd,
+          extraEntropy,
+        );
+        officerStorage.update({
+          account: safe,
+          when: AbsoluteTime.now(),
+        });
+
+        // accountStorage.update({ id, signingKey });
+        const strKey = encodeCrock(signingKey);
+        accountStorage.update({ id, strKey });
+
+        return opFixedSuccess(id)
+      },
+    };
+  }
+
+  if (account === undefined) {
+    return {
+      state: "locked",
+      forget: () => {
+        officerStorage.reset();
+        return opFixedSuccess(undefined)
+      },
+      tryUnlock: async (pwd: string) => {
+        const ac = await unlockOfficerAccount(officer.account, pwd);
+        // accountStorage.update(ac);
+        accountStorage.update({
+          id: ac.id,
+          strKey: encodeCrock(ac.signingKey),
+        });
+        return opFixedSuccess(undefined)
+      },
+    };
+  }
+
+  return {
+    state: "ready",
+    account,
+    lock: () => {
+      accountStorage.reset();
+      return opFixedSuccess(undefined)
+    },
+    forget: () => {
+      officerStorage.reset();
+      accountStorage.reset();
+      return opFixedSuccess(undefined)
+    },
+  };
+}