no-fix: remove 'any' and login status is taken from backend

1 files changed, 41 insertions, 19 deletions

diff --git a/packages/demobank-ui/src/hooks/backend.ts b/packages/demobank-ui/src/hooks/backend.ts
index 3b00edee3..967d5ee85 100644
--- a/packages/demobank-ui/src/hooks/backend.ts
+++ b/packages/demobank-ui/src/hooks/backend.ts
@@ -1,33 +1,55 @@
 import { hooks } from "@gnu-taler/web-util/lib/index.browser";
-import { StateUpdater } from "preact/hooks";
 
 /**
  * Has the information to reach and
  * authenticate at the bank's backend.
  */
-export interface BackendStateType {
-  url?: string;
-  username?: string;
-  password?: string;
+export type BackendState = LoggedIn | LoggedOut
+
+export interface BackendInfo {
+  url: string;
+  username: string;
+  password: string;
+}
+
+interface LoggedIn extends BackendInfo {
+  status: "loggedIn"
+}
+interface LoggedOut {
+  status: "loggedOut"
 }
 
+export const defaultState: BackendState = { status: "loggedOut" }
+
+export interface BackendStateHandler {
+  state: BackendState,
+  clear(): void;
+  save(info: BackendInfo): void;
+}
 /**
  * Return getters and setters for
  * login credentials and backend's
  * base URL.
  */
-type BackendStateTypeOpt = BackendStateType | undefined;
-export function useBackendState(
-  state?: BackendStateType,
-): [BackendStateTypeOpt, StateUpdater<BackendStateTypeOpt>] {
-  const ret = hooks.useLocalStorage("backend-state", JSON.stringify(state));
-  const retObj: BackendStateTypeOpt = ret[0] ? JSON.parse(ret[0]) : ret[0];
-  const retSetter: StateUpdater<BackendStateTypeOpt> = function (val) {
-    const newVal =
-      val instanceof Function
-        ? JSON.stringify(val(retObj))
-        : JSON.stringify(val);
-    ret[1](newVal);
-  };
-  return [retObj, retSetter];
+export function useBackendState(): BackendStateHandler {
+  const [value, update] = hooks.useLocalStorage("backend-state", JSON.stringify(defaultState));
+  // const parsed = value !== undefined ? JSON.parse(value) : value;
+  let parsed
+  try {
+    parsed = JSON.parse(value!)
+  } catch {
+    parsed = undefined
+  }
+  const state: BackendState = !parsed?.status ? defaultState : parsed
+
+  return {
+    state,
+    clear() {
+      update(JSON.stringify(defaultState))
+    },
+    save(info) {
+      const nextState: BackendState = { status: "loggedIn", ...info }
+      update(JSON.stringify(nextState))
+    },
+  }
 }