improve error message for templates with currency-only amount

3 files changed, 22 insertions, 6 deletions

diff --git a/packages/taler-util/src/amounts.ts b/packages/taler-util/src/amounts.ts
index c3770a393..16774f376 100644
--- a/packages/taler-util/src/amounts.ts
+++ b/packages/taler-util/src/amounts.ts
@@ -22,12 +22,12 @@
  * Imports.
  */
 import {
-  buildCodecForObject,
-  codecForString,
-  codecForNumber,
   Codec,
   Context,
   DecodingError,
+  buildCodecForObject,
+  codecForNumber,
+  codecForString,
   renderContext,
 } from "./codec.js";
 import { CurrencySpecification } from "./index.js";
@@ -369,6 +369,13 @@ export class Amounts {
   }
 
   /**
+   * Check whether a string is a valid currency for a Taler amount.
+   */
+  static isCurrency(s: string): boolean {
+    return /^[a-zA-Z]{1,11}/.test(s);
+  }
+
+  /**
    * Parse an amount like 'EUR:20.5' for 20 Euros and 50 ct.
    *
    * Currency name size limit is 11 of ASCII letters
diff --git a/packages/taler-util/src/taleruri.ts b/packages/taler-util/src/taleruri.ts
index 22846c7a4..db21f0ad6 100644
--- a/packages/taler-util/src/taleruri.ts
+++ b/packages/taler-util/src/taleruri.ts
@@ -75,11 +75,16 @@ export interface PayUriResult {
   noncePriv?: string;
 }
 
+export type TemplateParams = {
+  amount?: string;
+  summary?: string;
+}
+
 export interface PayTemplateUriResult {
   type: TalerUriAction.PayTemplate;
   merchantBaseUrl: string;
   templateId: string;
-  templateParams: Record<string, string>;
+  templateParams: TemplateParams;
 }
 
 export interface WithdrawUriResult {
diff --git a/packages/taler-util/src/wallet-types.ts b/packages/taler-util/src/wallet-types.ts
index e6a66ac9d..4e3e8ac30 100644
--- a/packages/taler-util/src/wallet-types.ts
+++ b/packages/taler-util/src/wallet-types.ts
@@ -46,7 +46,11 @@ import {
   codecOptional,
   renderContext,
 } from "./codec.js";
-import { CurrencySpecification, WithdrawalOperationStatus } from "./index.js";
+import {
+  CurrencySpecification,
+  TemplateParams,
+  WithdrawalOperationStatus,
+} from "./index.js";
 import { VersionMatchResult } from "./libtool-version.js";
 import { PaytoUri } from "./payto.js";
 import { AgeCommitmentProof } from "./taler-crypto.js";
@@ -1927,7 +1931,7 @@ export const codecForSharePaymentResult = (): Codec<SharePaymentResult> =>
 
 export interface PreparePayTemplateRequest {
   talerPayTemplateUri: string;
-  templateParams?: Record<string, string>;
+  templateParams?: TemplateParams;
 }
 
 export const codecForPreparePayTemplateRequest =