[taler-wallet-core] branch master updated: wallet-core: improve crypto worker code duplication

[gnunet]

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dold pushed a commit to branch master
in repository wallet-core.

The following commit(s) were added to refs/heads/master by this push:
     new dd14e67c7 wallet-core: improve crypto worker code duplication
dd14e67c7 is described below

commit dd14e67c70cd7b5b6891295759cb08aa2f94f180
Author: Florian Dold <florian@dold.me>
AuthorDate: Wed Oct 5 12:52:49 2022 +0200

    wallet-core: improve crypto worker code duplication
    
    Also add new testCrypto call for later testing
---
 packages/taler-util/src/taler-error-codes.ts       | 64 +++++++++++++-----
 .../src/crypto/workers/cryptoDispatcher.ts         | 12 ++--
 .../src/crypto/workers/cryptoWorkerInterface.ts    | 61 ++++++++++++++++-
 .../src/crypto/workers/nodeThreadWorker.ts         | 55 ++--------------
 .../src/crypto/workers/rpcClient.ts                |  3 +
 .../src/crypto/workers/synchronousWorkerNode.ts    | 70 +++++---------------
 .../src/crypto/workers/synchronousWorkerWeb.ts     | 76 +++++++---------------
 packages/taler-wallet-core/src/errors.ts           |  3 +
 packages/taler-wallet-core/src/wallet-api-types.ts | 11 ++++
 packages/taler-wallet-core/src/wallet.ts           |  3 +
 .../src/browserCryptoWorkerFactory.ts              |  2 +
 .../taler-wallet-webextension/src/wxBackend.ts     |  2 +
 12 files changed, 182 insertions(+), 180 deletions(-)

diff --git a/packages/taler-util/src/taler-error-codes.ts 
b/packages/taler-util/src/taler-error-codes.ts
index a66ae8dbe..ee6a7a166 100644
--- a/packages/taler-util/src/taler-error-codes.ts
+++ b/packages/taler-util/src/taler-error-codes.ts
@@ -152,6 +152,14 @@ export enum TalerErrorCode {
   GENERIC_PARAMETER_MALFORMED = 26,
 
 
+  /**
+   * The reserve public key given as part of a /reserves/ endpoint was 
malformed.
+   * Returned with an HTTP status code of #MHD_HTTP_BAD_REQUEST (400).
+   * (A value of 0 indicates that the error is generated client-side).
+   */
+  GENERIC_RESERVE_PUB_MALFORMED = 27,
+
+
   /**
    * The currencies involved in the operation do not match.
    * Returned with an HTTP status code of #MHD_HTTP_BAD_REQUEST (400).
@@ -456,14 +464,6 @@ export enum TalerErrorCode {
   EXCHANGE_GENERIC_NEW_DENOMS_ARRAY_SIZE_EXCESSIVE = 1018,
 
 
-  /**
-   * The reserve public key was malformed.
-   * Returned with an HTTP status code of #MHD_HTTP_BAD_REQUEST (400).
-   * (A value of 0 indicates that the error is generated client-side).
-   */
-  EXCHANGE_GENERIC_RESERVE_PUB_MALFORMED = 1019,
-
-
   /**
    * The time at the server is too far off from the time specified in the 
request. Most likely the client system time is wrong.
    * Returned with an HTTP status code of #MHD_HTTP_BAD_REQUEST (400).
@@ -1288,6 +1288,38 @@ export enum TalerErrorCode {
   EXCHANGE_RESERVES_RESERVE_MERGE_SIGNATURE_INVALID = 1778,
 
 
+  /**
+   * The signature by the reserve affirming the open operation is invalid.
+   * Returned with an HTTP status code of #MHD_HTTP_FORBIDDEN (403).
+   * (A value of 0 indicates that the error is generated client-side).
+   */
+  EXCHANGE_RESERVES_OPEN_BAD_SIGNATURE = 1785,
+
+
+  /**
+   * The signature by the reserve affirming the close operation is invalid.
+   * Returned with an HTTP status code of #MHD_HTTP_FORBIDDEN (403).
+   * (A value of 0 indicates that the error is generated client-side).
+   */
+  EXCHANGE_RESERVES_CLOSE_BAD_SIGNATURE = 1786,
+
+
+  /**
+   * The signature by the reserve affirming the attestion request is invalid.
+   * Returned with an HTTP status code of #MHD_HTTP_FORBIDDEN (403).
+   * (A value of 0 indicates that the error is generated client-side).
+   */
+  EXCHANGE_RESERVES_ATTEST_BAD_SIGNATURE = 1787,
+
+
+  /**
+   * The exchange does not know an origin account to which the remaining 
reserve balance could be wired to, and the wallet failed to provide one.
+   * Returned with an HTTP status code of #MHD_HTTP_CONFLICT (409).
+   * (A value of 0 indicates that the error is generated client-side).
+   */
+  EXCHANGE_RESERVES_CLOSE_NO_TARGET_ACCOUNT = 1788,
+
+
   /**
    * The auditor that was supposed to be disabled is unknown to this exchange.
    * Returned with an HTTP status code of #MHD_HTTP_NOT_FOUND (404).
@@ -1768,14 +1800,6 @@ export enum TalerErrorCode {
   MERCHANT_GENERIC_HOLE_IN_WIRE_FEE_STRUCTURE = 2001,
 
 
-  /**
-   * The reserve key of given to a /reserves/ handler was malformed.
-   * Returned with an HTTP status code of #MHD_HTTP_BAD_REQUEST (400).
-   * (A value of 0 indicates that the error is generated client-side).
-   */
-  MERCHANT_GENERIC_RESERVE_PUB_MALFORMED = 2002,
-
-
   /**
    * The proposal is not known to the backend.
    * Returned with an HTTP status code of #MHD_HTTP_NOT_FOUND (404).
@@ -3064,6 +3088,14 @@ export enum TalerErrorCode {
   WALLET_CRYPTO_WORKER_ERROR = 7023,
 
 
+  /**
+   * The crypto worker received a bad request.
+   * Returned with an HTTP status code of #MHD_HTTP_UNINITIALIZED (0).
+   * (A value of 0 indicates that the error is generated client-side).
+   */
+  WALLET_CRYPTO_WORKER_BAD_REQUEST = 7024,
+
+
   /**
    * We encountered a timeout with our payment backend.
    * Returned with an HTTP status code of #MHD_HTTP_GATEWAY_TIMEOUT (504).
diff --git a/packages/taler-wallet-core/src/crypto/workers/cryptoDispatcher.ts 
b/packages/taler-wallet-core/src/crypto/workers/cryptoDispatcher.ts
index 8568f0db8..85f9acddc 100644
--- a/packages/taler-wallet-core/src/crypto/workers/cryptoDispatcher.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/cryptoDispatcher.ts
@@ -29,7 +29,7 @@ import { timer, performanceNow, TimerHandle } from 
"../../util/timer.js";
 import { nullCrypto, TalerCryptoInterface } from "../cryptoImplementation.js";
 import { CryptoWorker } from "./cryptoWorkerInterface.js";
 
-const logger = new Logger("cryptoApi.ts");
+const logger = new Logger("cryptoDispatcher.ts");
 
 /**
  * State of a crypto worker.
@@ -238,7 +238,7 @@ export class CryptoDispatcher {
   }
 
   handleWorkerMessage(ws: WorkerInfo, msg: any): void {
-    const id = msg.data.id;
+    const id = msg.id;
     if (typeof id !== "number") {
       logger.error("rpc id must be number");
       return;
@@ -256,12 +256,12 @@ export class CryptoDispatcher {
     if (currentWorkItem.state === WorkItemState.Running) {
       this.numBusy--;
       currentWorkItem.state = WorkItemState.Finished;
-      if (msg.data.type === "success") {
-        currentWorkItem.resolve(msg.data.result);
-      } else if (msg.data.type === "error") {
+      if (msg.type === "success") {
+        currentWorkItem.resolve(msg.result);
+      } else if (msg.type === "error") {
         currentWorkItem.reject(
           TalerError.fromDetail(TalerErrorCode.WALLET_CRYPTO_WORKER_ERROR, {
-            innerError: msg.data.error,
+            innerError: msg.error,
           }),
         );
       } else {
diff --git 
a/packages/taler-wallet-core/src/crypto/workers/cryptoWorkerInterface.ts 
b/packages/taler-wallet-core/src/crypto/workers/cryptoWorkerInterface.ts
index 9f3ee6f50..b3620e950 100644
--- a/packages/taler-wallet-core/src/crypto/workers/cryptoWorkerInterface.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/cryptoWorkerInterface.ts
@@ -1,8 +1,65 @@
+/*
+ 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 { TalerErrorDetail } from "@gnu-taler/taler-util";
+
+/**
+ * Common interface for all crypto workers.
+ */
 export interface CryptoWorker {
   postMessage(message: any): void;
-
   terminate(): void;
-
   onmessage: ((m: any) => void) | undefined;
   onerror: ((m: any) => void) | undefined;
 }
+
+/**
+ * Type of requests sent to the crypto worker.
+ */
+export type CryptoWorkerRequestMessage = {
+  /**
+   * Operation ID to correlate request with the response.
+   */
+  id: number;
+
+  /**
+   * Operation to execute.
+   */
+  operation: string;
+
+  /**
+   * Operation-specific request payload.
+   */
+  req: any;
+};
+
+/**
+ * Type of messages sent back by the crypto worker.
+ */
+export type CryptoWorkerResponseMessage =
+  | {
+      type: "success";
+      id: number;
+      result: any;
+    }
+  | {
+      type: "error";
+      id?: number;
+      error: TalerErrorDetail;
+    };
diff --git a/packages/taler-wallet-core/src/crypto/workers/nodeThreadWorker.ts 
b/packages/taler-wallet-core/src/crypto/workers/nodeThreadWorker.ts
index 71f137f29..ed67d2e95 100644
--- a/packages/taler-wallet-core/src/crypto/workers/nodeThreadWorker.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/nodeThreadWorker.ts
@@ -17,12 +17,12 @@
 /**
  * Imports
  */
-import { CryptoWorkerFactory } from "./cryptoDispatcher.js";
-import { CryptoWorker } from "./cryptoWorkerInterface.js";
-import os from "os";
 import { Logger } from "@gnu-taler/taler-util";
+import os from "os";
 import { nativeCryptoR } from "../cryptoImplementation.js";
-import { getErrorDetailFromException } from "../../errors.js";
+import { CryptoWorkerFactory } from "./cryptoDispatcher.js";
+import { CryptoWorker } from "./cryptoWorkerInterface.js";
+import { processRequestWithImpl } from "./worker-common.js";
 
 const logger = new Logger("nodeThreadWorker.ts");
 
@@ -71,44 +71,7 @@ const workerCode = `
  */
 export function handleWorkerMessage(msg: any): void {
   const handleRequest = async (): Promise<void> => {
-    const req = msg.req;
-    if (typeof req !== "object") {
-      logger.error("request must be an object");
-      return;
-    }
-    const id = msg.id;
-    if (typeof id !== "number") {
-      logger.error("RPC id must be number");
-      return;
-    }
-    const operation = msg.operation;
-    if (typeof operation !== "string") {
-      logger.error("RPC operation must be string");
-      return;
-    }
-    const impl = nativeCryptoR;
-
-    if (!(operation in impl)) {
-      logger.error(`crypto operation '${operation}' not found`);
-      return;
-    }
-
-    let responseMsg: any;
-
-    try {
-      const result = await (impl as any)[operation](impl, req);
-      responseMsg = { data: { type: "success", result, id } };
-    } catch (e: any) {
-      logger.error(`error during operation: ${e.stack ?? e.toString()}`);
-      responseMsg = {
-        data: {
-          type: "error",
-          error: getErrorDetailFromException(e),
-          id,
-        },
-      };
-    }
-
+    const responseMsg = await processRequestWithImpl(msg, nativeCryptoR);
     try {
       // eslint-disable-next-line @typescript-eslint/no-var-requires
       const _r = "require";
@@ -122,16 +85,12 @@ export function handleWorkerMessage(msg: any): void {
         logger.error("parent port not available (not running in thread?");
       }
     } catch (e: any) {
-      logger.error(
-        `error sending back operation result: ${e.stack ?? e.toString()}`,
-      );
+      logger.error(`error in node worker: ${e.stack ?? e.toString()}`);
       return;
     }
   };
 
-  handleRequest().catch((e) => {
-    logger.error("error in node worker", e);
-  });
+  handleRequest();
 }
 
 export function handleWorkerError(e: Error): void {
diff --git a/packages/taler-wallet-core/src/crypto/workers/rpcClient.ts 
b/packages/taler-wallet-core/src/crypto/workers/rpcClient.ts
index a8df8b4c6..f3a4fff1c 100644
--- a/packages/taler-wallet-core/src/crypto/workers/rpcClient.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/rpcClient.ts
@@ -24,6 +24,9 @@ import { OpenedPromise, openPromise } from 
"../../util/promiseUtils.js";
 
 const logger = new Logger("synchronousWorkerFactory.ts");
 
+/**
+ * Client for the crypto helper process (taler-crypto-worker from 
exchange.git).
+ */
 export class CryptoRpcClient {
   proc: child_process.ChildProcessByStdio<
     internal.Writable,
diff --git 
a/packages/taler-wallet-core/src/crypto/workers/synchronousWorkerNode.ts 
b/packages/taler-wallet-core/src/crypto/workers/synchronousWorkerNode.ts
index f3cfc5ef9..28ff1860b 100644
--- a/packages/taler-wallet-core/src/crypto/workers/synchronousWorkerNode.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/synchronousWorkerNode.ts
@@ -14,20 +14,24 @@
  GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
-import { Logger } from "@gnu-taler/taler-util";
-import { getErrorDetailFromException } from "../../errors.js";
+import { j2s, Logger } from "@gnu-taler/taler-util";
 import {
   nativeCryptoR,
   TalerCryptoInterfaceR,
 } from "../cryptoImplementation.js";
+import { CryptoWorker } from "./cryptoWorkerInterface.js";
 import { CryptoRpcClient } from "./rpcClient.js";
+import { processRequestWithImpl } from "./worker-common.js";
 
 const logger = new Logger("synchronousWorker.ts");
 
 /**
  * Worker implementation that uses node subprocesses.
+ *
+ * The node cryto worker can also use IPC to offload cryptographic
+ * operations to a helper process (ususally written in C / part of 
taler-exchange).
  */
-export class SynchronousCryptoWorker {
+export class SynchronousCryptoWorker implements CryptoWorker {
   /**
    * Function to be called when we receive a message from the worker thread.
    */
@@ -144,61 +148,19 @@ export class SynchronousCryptoWorker {
     }
   }
 
-  private async handleRequest(
-    operation: string,
-    id: number,
-    req: unknown,
-  ): Promise<void> {
-    const impl = this.cryptoImplR;
-
-    if (!(operation in impl)) {
-      logger.error(`crypto operation '${operation}' not found`);
-      return;
-    }
-
-    let responseMsg: any;
-    try {
-      const result = await (impl as any)[operation](impl, req);
-      responseMsg = { data: { type: "success", result, id } };
-    } catch (e: any) {
-      logger.error(`error during operation: ${e.stack ?? e.toString()}`);
-      responseMsg = {
-        data: {
-          type: "error",
-          id,
-          error: getErrorDetailFromException(e),
-        },
-      };
-    }
-
-    try {
-      setTimeout(() => this.dispatchMessage(responseMsg), 0);
-    } catch (e) {
-      logger.error("got error during dispatch", e);
-    }
-  }
-
   /**
    * Send a message to the worker thread.
    */
   postMessage(msg: any): void {
-    const req = msg.req;
-    if (typeof req !== "object") {
-      logger.error("request must be an object");
-      return;
-    }
-    const id = msg.id;
-    if (typeof id !== "number") {
-      logger.error("RPC id must be number");
-      return;
-    }
-    const operation = msg.operation;
-    if (typeof operation !== "string") {
-      logger.error("RPC operation must be string");
-      return;
-    }
-
-    this.handleRequest(operation, id, req).catch((e) => {
+    const handleRequest = async () => {
+      const responseMsg = await processRequestWithImpl(msg, this.cryptoImplR);
+      try {
+        setTimeout(() => this.dispatchMessage(responseMsg), 0);
+      } catch (e) {
+        logger.error("got error during dispatch", e);
+      }
+    };
+    handleRequest().catch((e) => {
       logger.error("Error while handling crypto request:", e);
     });
   }
diff --git 
a/packages/taler-wallet-core/src/crypto/workers/synchronousWorkerWeb.ts 
b/packages/taler-wallet-core/src/crypto/workers/synchronousWorkerWeb.ts
index 22fd0d96b..780f6c634 100644
--- a/packages/taler-wallet-core/src/crypto/workers/synchronousWorkerWeb.ts
+++ b/packages/taler-wallet-core/src/crypto/workers/synchronousWorkerWeb.ts
@@ -14,19 +14,26 @@
  GNU Taler; see the file COPYING.  If not, see <http://www.gnu.org/licenses/>
  */
 
+/**
+ * Imports.
+ */
 import { Logger } from "@gnu-taler/taler-util";
-import { getErrorDetailFromException } from "../../errors.js";
 import {
   nativeCryptoR,
   TalerCryptoInterfaceR,
 } from "../cryptoImplementation.js";
+import { CryptoWorker } from "./cryptoWorkerInterface.js";
+import {
+  processRequestWithImpl,
+} from "./worker-common.js";
 
 const logger = new Logger("synchronousWorker.ts");
 
 /**
- * Worker implementation that uses node subprocesses.
+ * Worker implementation that synchronously executes cryptographic
+ * operations.
  */
-export class SynchronousCryptoWorker {
+export class SynchronousCryptoWorker implements CryptoWorker {
   /**
    * Function to be called when we receive a message from the worker thread.
    */
@@ -65,61 +72,22 @@ export class SynchronousCryptoWorker {
     }
   }
 
-  private async handleRequest(
-    operation: string,
-    id: number,
-    req: unknown,
-  ): Promise<void> {
-    const impl = this.cryptoImplR;
-
-    if (!(operation in impl)) {
-      logger.error(`crypto operation '${operation}' not found`);
-      return;
-    }
-
-    let responseMsg: any;
-    try {
-      const result = await (impl as any)[operation](impl, req);
-      responseMsg = { data: { type: "success", result, id } };
-    } catch (e: any) {
-      logger.error(`error during operation: ${e.stack ?? e.toString()}`);
-      responseMsg = {
-        data: {
-          type: "error",
-          id,
-          error: getErrorDetailFromException(e),
-        },
-      };
-    }
-
-    try {
-      setTimeout(() => this.dispatchMessage(responseMsg), 0);
-    } catch (e) {
-      logger.error("got error during dispatch", e);
-    }
-  }
-
   /**
    * Send a message to the worker thread.
    */
   postMessage(msg: any): void {
-    const req = msg.req;
-    if (typeof req !== "object") {
-      logger.error("request must be an object");
-      return;
-    }
-    const id = msg.id;
-    if (typeof id !== "number") {
-      logger.error("RPC id must be number");
-      return;
-    }
-    const operation = msg.operation;
-    if (typeof operation !== "string") {
-      logger.error("RPC operation must be string");
-      return;
-    }
-
-    this.handleRequest(operation, id, req).catch((e) => {
+    const handleRequest = async () => {
+      const responseMsg = await processRequestWithImpl(
+        msg,
+        this.cryptoImplR,
+      );
+      try {
+        setTimeout(() => this.dispatchMessage(responseMsg), 0);
+      } catch (e) {
+        logger.error("got error during dispatch", e);
+      }
+    };
+    handleRequest().catch((e) => {
       logger.error("Error while handling crypto request:", e);
     });
   }
diff --git a/packages/taler-wallet-core/src/errors.ts 
b/packages/taler-wallet-core/src/errors.ts
index 60aecf7a1..f8f5cef0e 100644
--- a/packages/taler-wallet-core/src/errors.ts
+++ b/packages/taler-wallet-core/src/errors.ts
@@ -76,6 +76,9 @@ export interface DetailsMap {
   [TalerErrorCode.WALLET_CRYPTO_WORKER_ERROR]: {
     innerError: TalerErrorDetail;
   };
+  [TalerErrorCode.WALLET_CRYPTO_WORKER_BAD_REQUEST]: {
+    detail: string;
+  };
 }
 
 type ErrBody<Y> = Y extends keyof DetailsMap ? DetailsMap[Y] : never;
diff --git a/packages/taler-wallet-core/src/wallet-api-types.ts 
b/packages/taler-wallet-core/src/wallet-api-types.ts
index de955e5c7..2860a6972 100644
--- a/packages/taler-wallet-core/src/wallet-api-types.ts
+++ b/packages/taler-wallet-core/src/wallet-api-types.ts
@@ -92,6 +92,7 @@ export enum WalletApiOperation {
   WithdrawTestBalance = "withdrawTestBalance",
   PreparePayForUri = "preparePayForUri",
   RunIntegrationTest = "runIntegrationTest",
+  CryptoTest = "cryptoTest",
   TestPay = "testPay",
   AddExchange = "addExchange",
   GetTransactions = "getTransactions",
@@ -524,6 +525,15 @@ export type RunIntegrationTestOp = {
   response: {};
 };
 
+/**
+ * Test crypto worker.
+ */
+export type CryptoTestOp = {
+  op: WalletApiOperation.CryptoTest;
+  request: {};
+  response: any;
+};
+
 /**
  * Make withdrawal on a test deployment of the exchange
  * and merchant.
@@ -639,6 +649,7 @@ export type WalletOperations = {
   [WalletApiOperation.AddBackupProvider]: AddBackupProviderOp;
   [WalletApiOperation.GetBackupInfo]: GetBackupInfoOp;
   [WalletApiOperation.RunIntegrationTest]: RunIntegrationTestOp;
+  [WalletApiOperation.CryptoTest]: CryptoTestOp;
   [WalletApiOperation.WithdrawTestBalance]: WithdrawTestBalanceOp;
   [WalletApiOperation.TestPay]: TestPayOp;
   [WalletApiOperation.ExportDb]: ExportDbOp;
diff --git a/packages/taler-wallet-core/src/wallet.ts 
b/packages/taler-wallet-core/src/wallet.ts
index 244bc1299..129ee458f 100644
--- a/packages/taler-wallet-core/src/wallet.ts
+++ b/packages/taler-wallet-core/src/wallet.ts
@@ -1445,6 +1445,9 @@ async function dispatchRequestInternal(
       logger.info(`started fakebank withdrawal: ${j2s(fbResp)}`);
       return {};
     }
+    case "testCrypto": {
+      return await ws.cryptoApi.hashString({ str: "hello world" });
+    }
     case "clearDb":
       await clearDatabase(ws.db.idbHandle());
       return {};
diff --git 
a/packages/taler-wallet-webextension/src/browserCryptoWorkerFactory.ts 
b/packages/taler-wallet-webextension/src/browserCryptoWorkerFactory.ts
index 75ec0906c..c93097da8 100644
--- a/packages/taler-wallet-webextension/src/browserCryptoWorkerFactory.ts
+++ b/packages/taler-wallet-webextension/src/browserCryptoWorkerFactory.ts
@@ -28,6 +28,8 @@ export class BrowserCryptoWorkerFactory implements 
CryptoWorkerFactory {
   startWorker(): CryptoWorker {
     const workerCtor = Worker;
     const workerPath = "/dist/browserWorkerEntry.js";
+    // FIXME: This is not really the same interface as the crypto worker!
+    // We need to wrap it.
     return new workerCtor(workerPath) as CryptoWorker;
   }
 
diff --git a/packages/taler-wallet-webextension/src/wxBackend.ts 
b/packages/taler-wallet-webextension/src/wxBackend.ts
index 9581abc56..68ec15591 100644
--- a/packages/taler-wallet-webextension/src/wxBackend.ts
+++ b/packages/taler-wallet-webextension/src/wxBackend.ts
@@ -217,6 +217,8 @@ async function reinitWallet(): Promise<void> {
     timer = new SetTimeoutTimerAPI();
   } else {
     httpLib = new BrowserHttpLib();
+    // We could (should?) use the BrowserCryptoWorkerFactory here,
+    // but right now we don't, to have less platform differences.
     cryptoWorker = new SynchronousCryptoWorkerFactory();
     timer = new SetTimeoutTimerAPI();
   }

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