1 files changed, 71 insertions, 0 deletions
diff --git a/packages/taler-util/src/payto.ts b/packages/taler-util/src/payto.ts
new file mode 100644
index 000000000..504db533b
--- /dev/null
+++ b/packages/taler-util/src/payto.ts
@@ -0,0 +1,71 @@
+/*
+ This file is part of GNU Taler
+ (C) 2019 GNUnet e.V.
+
+ 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 { URLSearchParams } from "./url.js";
+
+interface PaytoUri {
+  targetType: string;
+  targetPath: string;
+  params: { [name: string]: string };
+}
+
+const paytoPfx = "payto://";
+
+/**
+ * Add query parameters to a payto URI
+ */
+export function addPaytoQueryParams(
+  s: string,
+  params: { [name: string]: string },
+): string {
+  const [acct, search] = s.slice(paytoPfx.length).split("?");
+  const searchParams = new URLSearchParams(search || "");
+  for (const k of Object.keys(params)) {
+    searchParams.set(k, params[k]);
+  }
+  return paytoPfx + acct + "?" + searchParams.toString();
+}
+
+export function parsePaytoUri(s: string): PaytoUri | undefined {
+  if (!s.startsWith(paytoPfx)) {
+    return undefined;
+  }
+
+  const [acct, search] = s.slice(paytoPfx.length).split("?");
+
+  const firstSlashPos = acct.indexOf("/");
+
+  if (firstSlashPos === -1) {
+    return undefined;
+  }
+
+  const targetType = acct.slice(0, firstSlashPos);
+  const targetPath = acct.slice(firstSlashPos + 1);
+
+  const params: { [k: string]: string } = {};
+
+  const searchParams = new URLSearchParams(search || "");
+
+  searchParams.forEach((v, k) => {
+    params[v] = k;
+  });
+
+  return {
+    targetPath,
+    targetType,
+    params,
+  };
+}