1 files changed, 112 insertions, 0 deletions
diff --git a/packages/bank-ui/src/settings.ts b/packages/bank-ui/src/settings.ts
new file mode 100644
index 000000000..c085c7cd8
--- /dev/null
+++ b/packages/bank-ui/src/settings.ts
@@ -0,0 +1,112 @@
+/*
+ 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,
+  canonicalizeBaseUrl,
+  codecForBoolean,
+  codecForMap,
+  codecForString,
+  codecOptional,
+} from "@gnu-taler/taler-util";
+
+export interface UiSettings {
+  // Where libeufin backend is localted
+  // default: window.origin without "webui/"
+  backendBaseURL?: string;
+  // Shows a button "create random account" in the registration form
+  // Useful for testing
+  // default: false
+  allowRandomAccountCreation?: boolean;
+  // Create all random accounts with password "123"
+  // Useful for testing
+  // default: false
+  simplePasswordForRandomAccounts?: boolean;
+  // URL where the user is going to be redirected after
+  // clicking in Taler Logo
+  // default: home page
+  iconLinkURL?: string;
+  // Mapping for every link shown in the top navitation bar
+  //  - key: link label, what the user will read
+  //  - value: link target, where the user is going to be redirected
+  // default: empty list
+  topNavSites?: Record<string, string>;
+}
+
+/**
+ * Global settings for the bank UI.
+ */
+const defaultSettings: UiSettings = {
+  backendBaseURL: buildDefaultBackendBaseURL(),
+  iconLinkURL: undefined,
+  simplePasswordForRandomAccounts: false,
+  allowRandomAccountCreation: false,
+  topNavSites: {},
+};
+
+const codecForUISettings = (): Codec<UiSettings> =>
+  buildCodecForObject<UiSettings>()
+    .property("backendBaseURL", codecOptional(codecForString()))
+    .property("allowRandomAccountCreation", codecOptional(codecForBoolean()))
+    .property(
+      "simplePasswordForRandomAccounts",
+      codecOptional(codecForBoolean()),
+    )
+    .property("iconLinkURL", codecOptional(codecForString()))
+    .property("topNavSites", codecOptional(codecForMap(codecForString())))
+    .build("UiSettings");
+
+function removeUndefineField<T extends object>(obj: T): T {
+  const keys = Object.keys(obj) as Array<keyof T>;
+  return keys.reduce((prev, cur) => {
+    if (typeof prev[cur] === "undefined") {
+      delete prev[cur];
+    }
+    return prev;
+  }, obj);
+}
+
+export function fetchSettings(listener: (s: UiSettings) => void): void {
+  fetch("./settings.json")
+    .then((resp) => resp.json())
+    .then((json) => codecForUISettings().decode(json))
+    .then((result) =>
+      listener({
+        ...defaultSettings,
+        ...removeUndefineField(result),
+      }),
+    )
+    .catch((e) => {
+      console.log("failed to fetch settings", e);
+      listener(defaultSettings);
+    });
+}
+
+function buildDefaultBackendBaseURL(): string | undefined {
+  if (typeof window !== "undefined") {
+    const currentLocation = new URL(
+      window.location.pathname,
+      window.location.origin,
+    ).href;
+    /**
+     * By default, bank backend serves the html content
+     * from the /webui root.
+     */
+    return canonicalizeBaseUrl(currentLocation.replace("/webui", ""));
+  }
+  throw Error("No default URL");
+}