complain about merchant base URL mismatch, fixing #6616

packages/taler-wallet-core/src/operations/errors.ts

@@ -31,6 +31,14 @@ import { TalerErrorCode } from "../TalerErrorCode";
  * but the error has already been reported by writing it to the database.
  */
 export class OperationFailedAndReportedError extends Error {
+  static fromCode(
+    ec: TalerErrorCode,
+    message: string,
+    details: Record<string, unknown>,
+  ): OperationFailedAndReportedError {
+    return new OperationFailedAndReportedError(makeErrorDetails(ec, message, details));
+  }
+
   constructor(public operationError: TalerErrorDetails) {
     super(operationError.message);
 

packages/taler-wallet-core/src/operations/pay.ts

@@ -56,7 +56,11 @@ import * as Amounts from "../util/amounts";
 import { AmountJson } from "../util/amounts";
 import { Logger } from "../util/logging";
 import { parsePayUri } from "../util/taleruri";
-import { guardOperationException, OperationFailedError } from "./errors";
+import {
+  guardOperationException,
+  OperationFailedAndReportedError,
+  OperationFailedError,
+} from "./errors";
 import { createRefreshGroup, getTotalRefreshCost } from "./refresh";
 import { InternalWalletState, EXCHANGE_COINS_LOCK } from "./state";
 import {
@@ -661,6 +665,20 @@ async function processDownloadProposalImpl(
   );
   const fulfillmentUrl = parsedContractTerms.fulfillment_url;
 
+  const baseUrlForDownload = proposal.merchantBaseUrl;
+  const baseUrlFromContractTerms = parsedContractTerms.merchant_base_url;
+
+  if (baseUrlForDownload !== baseUrlFromContractTerms) {
+    throw OperationFailedAndReportedError.fromCode(
+      TalerErrorCode.WALLET_CONTRACT_TERMS_BASE_URL_MISMATCH,
+      "merchant base URL mismatch",
+      {
+        baseUrlForDownload,
+        baseUrlFromContractTerms,
+      },
+    );
+  }
+
   await ws.db.runWithWriteTransaction(
     [Stores.proposals, Stores.purchases],
     async (tx) => {