wallet: tipping protocol change / merchant version info

1 files changed, 68 insertions, 0 deletions

diff --git a/packages/taler-wallet-core/src/operations/merchants.ts b/packages/taler-wallet-core/src/operations/merchants.ts
new file mode 100644
index 000000000..d12417c7c
--- /dev/null
+++ b/packages/taler-wallet-core/src/operations/merchants.ts
@@ -0,0 +1,68 @@
+/*
+ This file is part of GNU Taler
+ (C) 2021 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/>
+ */
+
+/**
+ * Imports.
+ */
+import {
+  canonicalizeBaseUrl,
+  Logger,
+  URL,
+  codecForMerchantConfigResponse,
+  LibtoolVersion,
+} from "@gnu-taler/taler-util";
+import { InternalWalletState, MerchantInfo } from "../common.js";
+import { readSuccessResponseJsonOrThrow } from "../index.js";
+
+const logger = new Logger("taler-wallet-core:merchants.ts");
+
+export async function getMerchantInfo(
+  ws: InternalWalletState,
+  merchantBaseUrl: string,
+): Promise<MerchantInfo> {
+  const canonBaseUrl = canonicalizeBaseUrl(merchantBaseUrl);
+
+  const existingInfo = ws.merchantInfoCache[canonBaseUrl];
+  if (existingInfo) {
+    return existingInfo;
+  }
+
+  const configUrl = new URL("config", canonBaseUrl);
+  const resp = await ws.http.get(configUrl.href);
+
+  const configResp = await readSuccessResponseJsonOrThrow(
+    resp,
+    codecForMerchantConfigResponse(),
+  );
+
+  logger.info(
+    `merchant "${canonBaseUrl}" reports protocol ${configResp.version}"`,
+  );
+
+  const merchantInfo: MerchantInfo = {
+    supportsMerchantProtocolV1: !!LibtoolVersion.compare(
+      "1:0:0",
+      configResp.version,
+    )?.compatible,
+    supportsMerchantProtocolV2: !!LibtoolVersion.compare(
+      "2:0:0",
+      configResp.version,
+    )?.compatible,
+  };
+
+  ws.merchantInfoCache[canonBaseUrl] = merchantInfo;
+  return merchantInfo;
+}