1 files changed, 151 insertions, 0 deletions
diff --git a/packages/auditor-backoffice-ui/src/hooks/index.ts b/packages/auditor-backoffice-ui/src/hooks/index.ts
new file mode 100644
index 000000000..61afbc94a
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+++ b/packages/auditor-backoffice-ui/src/hooks/index.ts
@@ -0,0 +1,151 @@
+/*
+ This file is part of GNU Taler
+ (C) 2021-2024 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/>
+ */
+
+/**
+ *
+ * @author Sebastian Javier Marchano (sebasjm)
+ */
+
+import { buildCodecForObject, codecForMap, codecForString, codecForTimestamp } from "@gnu-taler/taler-util";
+import { buildStorageKey, useLocalStorage } from "@gnu-taler/web-util/browser";
+import { StateUpdater, useEffect, useState } from "preact/hooks";
+import { LoginToken } from "../declaration.js";
+import { ValueOrFunction } from "../utils/types.js";
+import { useMatchMutate } from "./backend.js";
+
+const calculateRootPath = () => {
+  const rootPath =
+    typeof window !== undefined
+      ? window.location.origin + window.location.pathname
+      : "/";
+
+  /**
+   * By default, merchant backend serves the html content
+   * from the /webui root. This should cover most of the 
+   * cases and the rootPath will be the merchant backend
+   * URL where the instances are
+   */
+  return rootPath.replace("/webui/", "");
+};
+
+const loginTokenCodec = buildCodecForObject<LoginToken>()
+  .property("token", codecForString())
+  .property("expiration", codecForTimestamp)
+  .build("loginToken")
+const TOKENS_KEY = buildStorageKey("auditor-token", codecForMap(loginTokenCodec));
+
+
+export function useBackendURL(
+  url?: string,
+): [string, StateUpdater<string>] {
+  const [value, setter] = useSimpleLocalStorage(
+    "auditor-base-url",
+    url || calculateRootPath(),
+  );
+
+  const checkedSetter = (v: ValueOrFunction<string>) => {
+    return setter((p) => (v instanceof Function ? v(p ?? "") : v).replace(/\/$/, ""));
+  };
+
+  return [value!, checkedSetter];
+}
+
+export function useBackendDefaultToken(
+): [LoginToken | undefined, ((d: LoginToken | undefined) => void)] {
+  const { update: setToken, value: tokenMap, reset } = useLocalStorage(TOKENS_KEY, {})
+
+  const tokenOfDefaultInstance = tokenMap["default"]
+  const clearCache = useMatchMutate()
+  useEffect(() => {
+    clearCache()
+  }, [tokenOfDefaultInstance])
+
+  function updateToken(
+    value: (LoginToken | undefined)
+  ): void {
+    if (value === undefined) {
+      reset()
+    } else {
+      const res = { ...tokenMap, "default": value }
+      setToken(res)
+    }
+  }
+  return [tokenMap["default"], updateToken];
+}
+
+export function useBackendInstanceToken(
+  id: string,
+): [LoginToken | undefined, ((d: LoginToken | undefined) => void)] {
+  const { update: setToken, value: tokenMap, reset } = useLocalStorage(TOKENS_KEY, {})
+  const [defaultToken, defaultSetToken] = useBackendDefaultToken();
+
+  // instance named 'default' use the default token
+  if (id === "default") {
+    return [defaultToken, defaultSetToken];
+  }
+  function updateToken(
+    value: (LoginToken | undefined)
+  ): void {
+    if (value === undefined) {
+      reset()
+    } else {
+      const res = { ...tokenMap, [id]: value }
+      setToken(res)
+    }
+  }
+
+  return [tokenMap[id], updateToken];
+}
+
+export function useLang(initial?: string): [string, StateUpdater<string>] {
+  const browserLang =
+    typeof window !== "undefined"
+      ? navigator.language || (navigator as any).userLanguage
+      : undefined;
+  const defaultLang = (browserLang || initial || "en").substring(0, 2);
+  return useSimpleLocalStorage("lang-preference", defaultLang) as [string, StateUpdater<string>];
+}
+
+export function useSimpleLocalStorage(
+  key: string,
+  initialValue?: string,
+): [string | undefined, StateUpdater<string | undefined>] {
+  const [storedValue, setStoredValue] = useState<string | undefined>(
+    (): string | undefined => {
+      return typeof window !== "undefined"
+        ? window.localStorage.getItem(key) || initialValue
+        : initialValue;
+    },
+  );
+
+  const setValue = (
+    value?: string | ((val?: string) => string | undefined),
+  ) => {
+    setStoredValue((p) => {
+      const toStore = value instanceof Function ? value(p) : value;
+      if (typeof window !== "undefined") {
+        if (!toStore) {
+          window.localStorage.removeItem(key);
+        } else {
+          window.localStorage.setItem(key, toStore);
+        }
+      }
+      return toStore;
+    });
+  };
+
+  return [storedValue, setValue];
+}