account as hook

1 files changed, 100 insertions, 0 deletions

diff --git a/packages/exchange-backoffice-ui/src/hooks/useOfficer.ts b/packages/exchange-backoffice-ui/src/hooks/useOfficer.ts
new file mode 100644
index 000000000..2ed375846
--- /dev/null
+++ b/packages/exchange-backoffice-ui/src/hooks/useOfficer.ts
@@ -0,0 +1,100 @@
+import {
+  AbsoluteTime,
+  Codec,
+  buildCodecForObject,
+  codecForAbsoluteTime,
+  codecForString,
+} from "@gnu-taler/taler-util";
+import {
+  Account,
+  LockedAccount,
+  createNewAccount,
+  unlockAccount,
+} from "../account.js";
+import {
+  buildStorageKey,
+  useLocalStorage,
+  useMemoryStorage,
+} from "@gnu-taler/web-util/browser";
+
+export interface Officer {
+  account: LockedAccount;
+  when: AbsoluteTime;
+}
+
+const codecForLockedAccount = codecForString() as Codec<LockedAccount>;
+
+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<void>;
+}
+interface OfficerLocked {
+  state: "locked";
+  forget: () => void;
+  tryUnlock: (password: string) => Promise<void>;
+}
+interface OfficerReady {
+  state: "ready";
+  account: Account;
+  forget: () => void;
+  lock: () => void;
+}
+
+const OFFICER_KEY = buildStorageKey("officer", codecForOfficer());
+const ACCOUNT_KEY = buildStorageKey<Account>("account");
+
+export function useOfficer(): OfficerState {
+  const accountStorage = useMemoryStorage(ACCOUNT_KEY);
+  const officerStorage = useLocalStorage(OFFICER_KEY);
+
+  const officer = officerStorage.value;
+  const account = accountStorage.value;
+
+  if (officer === undefined) {
+    return {
+      state: "not-found",
+      create: async (pwd: string) => {
+        const { accountId, safe, signingKey } = await createNewAccount(pwd);
+        officerStorage.update({
+          account: safe,
+          when: AbsoluteTime.now(),
+        });
+
+        accountStorage.update({ accountId, signingKey });
+      },
+    };
+  }
+
+  if (account === undefined) {
+    return {
+      state: "locked",
+      forget: () => {
+        officerStorage.reset();
+      },
+      tryUnlock: async (pwd: string) => {
+        const ac = await unlockAccount(officer.account, pwd);
+        accountStorage.update(ac);
+      },
+    };
+  }
+
+  return {
+    state: "ready",
+    account: account,
+    lock: () => {
+      accountStorage.reset();
+    },
+    forget: () => {
+      officerStorage.reset();
+      accountStorage.reset();
+    },
+  };
+}