towards the improved confirmPay API

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

@@ -49,6 +49,7 @@ import {
   PreparePayResult,
   RefreshReason,
   PreparePayResultType,
+  ConfirmPayResultType,
 } from "../types/walletTypes";
 import * as Amounts from "../util/amounts";
 import { AmountJson } from "../util/amounts";
@@ -853,7 +854,10 @@ export async function submitPay(
     lastSessionId: sessionId,
   };
 
-  return { nextUrl };
+  return {
+    type: ConfirmPayResultType.Done,
+    nextUrl,
+  };
 }
 
 /**
@@ -957,6 +961,9 @@ export async function preparePayForUri(
       await tx.put(Stores.purchases, p);
     });
     const r = await submitPay(ws, proposalId);
+    if (r.type !== ConfirmPayResultType.Done) {
+      throw Error("submitting pay failed");
+    }
     return {
       status: PreparePayResultType.AlreadyConfirmed,
       contractTerms: JSON.parse(purchase.contractTermsRaw),

packages/taler-wallet-core/src/types/transactions.ts

@@ -53,7 +53,7 @@ export interface TransactionsResponse {
   transactions: Transaction[];
 }
 
-interface TransactionError {
+export interface TransactionError {
   /**
    * TALER_EC_* unique error code.
    * The action(s) offered and message displayed on the transaction item depend on this code.

packages/taler-wallet-core/src/types/walletTypes.ts

@@ -45,6 +45,7 @@ import {
 } from "../util/codec";
 import { AmountString } from "./talerTypes";
 import { codec } from "..";
+import { TransactionError } from "./transactions";
 
 /**
  * Response for the create reserve request to the wallet.
@@ -192,13 +193,30 @@ export function mkAmount(
   return { value, fraction, currency };
 }
 
+export const enum ConfirmPayResultType {
+  Done = "done",
+  Pending = "pending",
+}
+
 /**
  * Result for confirmPay
  */
-export interface ConfirmPayResult {
+export interface ConfirmPayResultDone {
+  type: ConfirmPayResultType.Done,
+
   nextUrl: string;
 }
 
+export interface ConfirmPayResultPending {
+  type: ConfirmPayResultType.Pending,
+
+  lastError: TransactionError;
+}
+
+export type ConfirmPayResult =
+  | ConfirmPayResultDone
+  | ConfirmPayResultPending
+
 /**
  * Information about all sender wire details known to the wallet,
  * as well as exchanges that accept these wire types.

packages/taler-wallet-webextension/src/pages/pay.tsx

@@ -109,6 +109,9 @@ function TalerPayDialog({ talerPayUri }: { talerPayUri: string }): JSX.Element {
     try {
       setLoading(true);
       const res = await wxApi.confirmPay(proposalId, undefined);
+      if (res.type !== walletTypes.ConfirmPayResultType.Done) {
+        throw Error("payment pending");
+      }
       document.location.href = res.nextUrl;
     } catch (e) {
       console.error(e);