fold checkPay into preparePay

src/headless/integrationtest.ts

@@ -58,20 +58,20 @@ export async function runIntegrationTest(args: {
 
   console.log("payment status", paymentStatus);
 
-  const contractUrl = paymentStatus.contract_url;
-  if (!contractUrl) {
-    throw Error("no contract URL in payment response");
+  const talerPayUri = paymentStatus.taler_pay_uri;
+  if (!talerPayUri) {
+    throw Error("no taler://pay/ URI in payment response");
   }
 
-  const proposalId = await myWallet.downloadProposal(contractUrl);
+  const preparePayResult = await myWallet.preparePay(talerPayUri);
 
-  console.log("proposal id", proposalId);
+  console.log("prepare pay result", preparePayResult);
 
-  const checkPayResult = await myWallet.checkPay(proposalId);
+  if (preparePayResult.status != "payment-possible") {
+    throw Error("payment not possible");
+  }
 
-  console.log("check pay result", checkPayResult);
-
-  const confirmPayResult = await myWallet.confirmPay(proposalId, undefined);
+  const confirmPayResult = await myWallet.confirmPay(preparePayResult.proposalId, undefined);
 
   console.log("confirmPayResult", confirmPayResult);
 

src/wallet.ts

@@ -85,7 +85,6 @@ import {
 import {
   Badge,
   BenchmarkResult,
-  CheckPayResult,
   CoinSelectionResult,
   CoinWithDenom,
   ConfirmPayResult,
@@ -734,8 +733,15 @@ export class Wallet {
     return fu.href();
   }
 
-  async preparePay(url: string): Promise<PreparePayResult> {
-    const uriResult = parsePayUri(url);
+
+  /**
+   * Check if a payment for the given taler://pay/ URI is possible.
+   * 
+   * If the payment is possible, the signature are already generated but not
+   * yet send to the merchant.
+   */
+  async preparePay(talerPayUri: string): Promise<PreparePayResult> {
+    const uriResult = parsePayUri(talerPayUri);
 
     if (!uriResult) {
       return {
@@ -745,13 +751,11 @@ export class Wallet {
     }
 
     let proposalId: number;
-    let checkResult: CheckPayResult;
     try {
       proposalId = await this.downloadProposal(
         uriResult.downloadUrl,
         uriResult.sessionId,
       );
-      checkResult = await this.checkPay(proposalId);
     } catch (e) {
       return {
         status: "error",
@@ -765,50 +769,84 @@ export class Wallet {
 
     console.log("proposal", proposal);
 
-    if (uriResult.sessionId) {
-      const existingPayment = await this.q().getIndexed(
-        Stores.purchases.fulfillmentUrlIndex,
-        proposal.contractTerms.fulfillment_url,
+    // First check if we already payed for it.
+    const purchase = await this.q().get(
+      Stores.purchases,
+      proposal.contractTermsHash,
     );
-      if (existingPayment) {
-        console.log("existing payment", existingPayment);
-        await this.submitPay(
-          existingPayment.contractTermsHash,
-          uriResult.sessionId,
-        );
-        return {
-          status: "paid",
-          contractTerms: existingPayment.contractTerms,
-          nextUrl: this.getNextUrl(existingPayment.contractTerms),
-        };
-      }
-    }
 
-    if (checkResult.status === "paid") {
-      const nextUrl = this.getNextUrl(proposal.contractTerms);
-      return {
-        status: "paid",
-        contractTerms: proposal.contractTerms,
-        proposalId: proposal.id!,
-        nextUrl,
-      };
+    if (!purchase) {
+      const paymentAmount = Amounts.parseOrThrow(proposal.contractTerms.amount);
+      let wireFeeLimit;
+      if (proposal.contractTerms.max_wire_fee) {
+        wireFeeLimit = Amounts.parseOrThrow(proposal.contractTerms.max_wire_fee);
+      } else {
+        wireFeeLimit = Amounts.getZero(paymentAmount.currency);
       }
-    if (checkResult.status === "insufficient-balance") {
+      // If not already payed, check if we could pay for it.
+      const res = await this.getCoinsForPayment({
+        allowedAuditors: proposal.contractTerms.auditors,
+        allowedExchanges: proposal.contractTerms.exchanges,
+        depositFeeLimit: Amounts.parseOrThrow(proposal.contractTerms.max_fee),
+        paymentAmount,
+        wireFeeAmortization: proposal.contractTerms.wire_fee_amortization || 1,
+        wireFeeLimit,
+        wireFeeTime: getTalerStampSec(proposal.contractTerms.timestamp) || 0,
+        wireMethod: proposal.contractTerms.wire_method,
+      });
+
+      if (!res) {
+        console.log("not confirming payment, insufficient coins");
         return {
           status: "insufficient-balance",
           contractTerms: proposal.contractTerms,
           proposalId: proposal.id!,
         };
       }
-    if (checkResult.status === "payment-possible") {
+
+      // Only create speculative signature if we don't already have one for this proposal
+      if (
+        !this.speculativePayData ||
+        (this.speculativePayData &&
+          this.speculativePayData.proposalId !== proposalId)
+      ) {
+        const { exchangeUrl, cds, totalAmount } = res;
+        const payCoinInfo = await this.cryptoApi.signDeposit(
+          proposal.contractTerms,
+          cds,
+          totalAmount,
+        );
+        this.speculativePayData = {
+          exchangeUrl,
+          payCoinInfo,
+          proposal,
+          proposalId,
+        };
+        Wallet.enableTracing &&
+          console.log("created speculative pay data for payment");
+      }
+
       return {
         status: "payment-possible",
         contractTerms: proposal.contractTerms,
         proposalId: proposal.id!,
-        totalFees: checkResult.coinSelection!.totalFees,
+        totalFees: res.totalFees,
       };
     }
-    throw Error("not reached");
+
+    if (uriResult.sessionId) {
+      await this.submitPay(
+        purchase.contractTermsHash,
+        uriResult.sessionId,
+      );
+    }
+
+    return {
+      status: "paid",
+      contractTerms: proposal.contractTerms,
+      proposalId: proposal.id!,
+      nextUrl: this.getNextUrl(purchase.contractTerms),
+    };
   }
 
   /**
@@ -1088,85 +1126,6 @@ export class Wallet {
     return sp;
   }
 
-  /**
-   * Check if payment for an offer is possible, or if the offer has already
-   * been payed for.
-   *
-   * Also speculatively computes the signature for the payment to make the payment
-   * look faster to the user.
-   */
-  async checkPay(proposalId: number): Promise<CheckPayResult> {
-    const proposal = await this.q().get(Stores.proposals, proposalId);
-
-    if (!proposal) {
-      throw Error(`proposal with id ${proposalId} not found`);
-    }
-
-    // First check if we already payed for it.
-    const purchase = await this.q().get(
-      Stores.purchases,
-      proposal.contractTermsHash,
-    );
-    if (purchase) {
-      Wallet.enableTracing && console.log("got purchase", purchase);
-      return { status: "paid" };
-    }
-
-    const paymentAmount = Amounts.parseOrThrow(proposal.contractTerms.amount);
-
-    Wallet.enableTracing &&
-      console.log(
-        `checking if payment of ${JSON.stringify(paymentAmount)} is possible`,
-      );
-
-    let wireFeeLimit;
-    if (proposal.contractTerms.max_wire_fee) {
-      wireFeeLimit = Amounts.parseOrThrow(proposal.contractTerms.max_wire_fee);
-    } else {
-      wireFeeLimit = Amounts.getZero(paymentAmount.currency);
-    }
-
-    // If not already payed, check if we could pay for it.
-    const res = await this.getCoinsForPayment({
-      allowedAuditors: proposal.contractTerms.auditors,
-      allowedExchanges: proposal.contractTerms.exchanges,
-      depositFeeLimit: Amounts.parseOrThrow(proposal.contractTerms.max_fee),
-      paymentAmount,
-      wireFeeAmortization: proposal.contractTerms.wire_fee_amortization || 1,
-      wireFeeLimit,
-      wireFeeTime: getTalerStampSec(proposal.contractTerms.timestamp) || 0,
-      wireMethod: proposal.contractTerms.wire_method,
-    });
-
-    if (!res) {
-      console.log("not confirming payment, insufficient coins");
-      return { status: "insufficient-balance" };
-    }
-
-    // Only create speculative signature if we don't already have one for this proposal
-    if (
-      !this.speculativePayData ||
-      (this.speculativePayData &&
-        this.speculativePayData.proposalId !== proposalId)
-    ) {
-      const { exchangeUrl, cds, totalAmount } = res;
-      const payCoinInfo = await this.cryptoApi.signDeposit(
-        proposal.contractTerms,
-        cds,
-        totalAmount,
-      );
-      this.speculativePayData = {
-        exchangeUrl,
-        payCoinInfo,
-        proposal,
-        proposalId,
-      };
-      Wallet.enableTracing &&
-        console.log("created speculative pay data for payment");
-    }
-
-    return { status: "payment-possible", coinSelection: res };
-  }
 
   private async sendReserveInfoToBank(reservePub: string) {
     const reserve = await this.q().get<ReserveRecord>(

src/walletTypes.ts

@@ -220,14 +220,6 @@ export function mkAmount(
   return { value, fraction, currency };
 }
 
-/**
- * Possible results for checkPay.
- */
-export interface CheckPayResult {
-  status: "paid" | "payment-possible" | "insufficient-balance";
-  coinSelection?: CoinSelectionResult;
-}
-
 /**
  * Result for confirmPay
  */
@@ -463,16 +455,15 @@ export type PreparePayResult =
 
 export interface PreparePayResultPaymentPossible {
   status: "payment-possible";
-  proposalId?: number;
-  contractTerms?: ContractTerms;
-  totalFees?: AmountJson;
+  proposalId: number;
+  contractTerms: ContractTerms;
+  totalFees: AmountJson;
 }
 
 export interface PreparePayResultInsufficientBalance {
   status: "insufficient-balance";
-  proposalId?: number;
-  contractTerms?: ContractTerms;
-  totalFees?: AmountJson;
+  proposalId: number;
+  contractTerms: ContractTerms;
 }
 
 export interface PreparePayResultError {
@@ -482,8 +473,8 @@ export interface PreparePayResultError {
 
 export interface PreparePayResultPaid {
   status: "paid";
-  proposalId?: number;
-  contractTerms?: ContractTerms;
+  proposalId: number;
+  contractTerms: ContractTerms;
   nextUrl: string;
 }
 

src/webex/messages.ts

@@ -69,10 +69,6 @@ export interface MessageMap {
     request: { proposalId: number; sessionId?: string };
     response: walletTypes.ConfirmPayResult;
   };
-  "check-pay": {
-    request: { proposalId: number };
-    response: walletTypes.CheckPayResult;
-  };
   "exchange-info": {
     request: { baseUrl: string };
     response: dbTypes.ExchangeRecord;
@@ -205,7 +201,6 @@ export interface MessageMap {
     request: { talerPayUri: string };
     response: walletTypes.PreparePayResult;
   };
-
   "get-diagnostics": {
     request: { };
     response: walletTypes.WalletDiagnostics;

src/webex/pages/pay.tsx

@@ -24,7 +24,7 @@
  */
 import * as i18n from "../../i18n";
 
-import { CheckPayResult, PreparePayResult } from "../../walletTypes";
+import { PreparePayResult } from "../../walletTypes";
 
 import { renderAmount, ProgressButton, registerMountPage } from "../renderHtml";
 import * as wxApi from "../wxApi";

src/webex/wxApi.ts

@@ -29,13 +29,10 @@ import {
   DenominationRecord,
   ExchangeRecord,
   PreCoinRecord,
-  ProposalDownloadRecord,
-  PurchaseRecord,
   ReserveRecord,
 } from "../dbTypes";
 import {
   BenchmarkResult,
-  CheckPayResult,
   ConfirmPayResult,
   ReserveCreationInfo,
   SenderWireInfos,
@@ -45,10 +42,6 @@ import {
   WalletDiagnostics,
 } from "../walletTypes";
 
-import {
-  MerchantRefundPermission,
-} from "../talerTypes";
-
 import { MessageMap, MessageType } from "./messages";
 
 
@@ -217,13 +210,6 @@ export function payback(coinPub: string): Promise<void> {
   return callBackend("payback-coin", { coinPub });
 }
 
-/**
- * Check if payment is possible or already done.
- */
-export function checkPay(proposalId: number): Promise<CheckPayResult> {
-  return callBackend("check-pay", { proposalId });
-}
-
 /**
  * Pay for a proposal.
  */

src/webex/wxBackend.ts

@@ -132,12 +132,6 @@ async function handleMessage(
         detail.sessionId,
       );
     }
-    case "check-pay": {
-      if (typeof detail.proposalId !== "number") {
-        throw Error("proposalId must be number");
-      }
-      return needsWallet().checkPay(detail.proposalId);
-    }
     case "exchange-info": {
       if (!detail.baseUrl) {
         return Promise.resolve({ error: "bad url" });