wallet-core: add missing worker-common.ts file

packages/taler-wallet-core/src/crypto/workers/worker-common.ts

@@ -0,0 +1,99 @@
+/*
+ This file is part of GNU Taler
+ (C) 2022 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 { j2s, Logger, TalerErrorCode } from "@gnu-taler/taler-util";
+import { getErrorDetailFromException, makeErrorDetail } from "../../errors.js";
+import { TalerCryptoInterfaceR } from "../cryptoImplementation.js";
+import {
+  CryptoWorkerRequestMessage,
+  CryptoWorkerResponseMessage,
+} from "./cryptoWorkerInterface.js";
+
+const logger = new Logger("worker-common.ts");
+
+/**
+ * Process a crypto worker request by calling into the table
+ * of supported operations.
+ *
+ * Does not throw, but returns an error response instead.
+ */
+export async function processRequestWithImpl(
+  reqMsg: CryptoWorkerRequestMessage,
+  impl: TalerCryptoInterfaceR,
+): Promise<CryptoWorkerResponseMessage> {
+  if (typeof reqMsg !== "object") {
+    logger.error("request must be an object");
+    return {
+      type: "error",
+      error: makeErrorDetail(TalerErrorCode.WALLET_CRYPTO_WORKER_BAD_REQUEST, {
+        detail: "",
+      }),
+    };
+  }
+  const id = reqMsg.id;
+  if (typeof id !== "number") {
+    const msg = "RPC id must be number";
+    logger.error(msg);
+    return {
+      type: "error",
+      error: makeErrorDetail(TalerErrorCode.WALLET_CRYPTO_WORKER_BAD_REQUEST, {
+        detail: msg,
+      }),
+    };
+  }
+  const operation = reqMsg.operation;
+  if (typeof operation !== "string") {
+    const msg = "RPC operation must be string";
+    logger.error(msg);
+    return {
+      type: "error",
+      id,
+      error: makeErrorDetail(TalerErrorCode.WALLET_CRYPTO_WORKER_BAD_REQUEST, {
+        detail: msg,
+      }),
+    };
+  }
+
+  if (!(operation in impl)) {
+    const msg = `crypto operation '${operation}' not found`;
+    logger.error(msg);
+    return {
+      type: "error",
+      id,
+      error: makeErrorDetail(TalerErrorCode.WALLET_CRYPTO_WORKER_BAD_REQUEST, {
+        detail: msg,
+      }),
+    };
+  }
+
+  let responseMsg: CryptoWorkerResponseMessage;
+
+  try {
+    const result = await (impl as any)[operation](impl, reqMsg);
+    responseMsg = { type: "success", result, id };
+  } catch (e: any) {
+    logger.error(`error during operation: ${e.stack ?? e.toString()}`);
+    responseMsg = {
+      type: "error",
+      error: getErrorDetailFromException(e),
+      id,
+    };
+  }
+  return responseMsg;
+}