1 files changed, 83 insertions, 0 deletions
diff --git a/packages/web-util/src/context/wallet-integration.ts b/packages/web-util/src/context/wallet-integration.ts
new file mode 100644
index 000000000..e14988ed1
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+++ b/packages/web-util/src/context/wallet-integration.ts
@@ -0,0 +1,83 @@
+/*
+ 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 { stringifyTalerUri, TalerUri } from "@gnu-taler/taler-util";
+import { ComponentChildren, createContext, h, VNode } from "preact";
+import { useContext } from "preact/hooks";
+
+/**
+ * https://docs.taler.net/design-documents/039-taler-browser-integration.html
+ *
+ * @param uri
+ */
+function createHeadMetaTag(uri: TalerUri, onNotFound?: () => void) {
+  const meta = document.createElement("meta");
+  meta.setAttribute("name", "taler-uri");
+  meta.setAttribute("content", stringifyTalerUri(uri));
+
+  document.head.appendChild(meta);
+
+  let walletFound = false;
+  window.addEventListener("beforeunload", () => {
+    walletFound = true;
+  });
+  setTimeout(() => {
+    if (!walletFound && onNotFound) {
+      onNotFound();
+    }
+  }, 10); //very short timeout
+}
+interface Type {
+  /**
+   * Tell the active wallet that an action is found
+   *
+   * @param uri
+   * @returns
+   */
+  publishTalerAction: (uri: TalerUri, onNotFound?: () => void) => void;
+}
+
+// @ts-expect-error default value to undefined, should it be another thing?
+const Context = createContext<Type>(undefined);
+
+export const useTalerWalletIntegrationAPI = (): Type => useContext(Context);
+
+export const TalerWalletIntegrationBrowserProvider = ({
+  children,
+}: {
+  children: ComponentChildren;
+}): VNode => {
+  const value: Type = {
+    publishTalerAction: createHeadMetaTag,
+  };
+  return h(Context.Provider, {
+    value,
+    children,
+  });
+};
+
+export const TalerWalletIntegrationTestingProvider = ({
+  children,
+  value,
+}: {
+  children: ComponentChildren;
+  value: Type;
+}): VNode => {
+  return h(Context.Provider, {
+    value,
+    children,
+  });
+};