From 13f397521c0bb2b1587fa287de5be49c74f69d12 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Thu, 7 Dec 2023 20:08:51 +0100
Subject: wallet-core: implement prepareWithdrawExchange request

---
 packages/taler-wallet-core/src/wallet.ts | 35 +++++++++++++++++++++++++++++++-
 1 file changed, 34 insertions(+), 1 deletion(-)

(limited to 'packages/taler-wallet-core/src/wallet.ts')

diff --git a/packages/taler-wallet-core/src/wallet.ts b/packages/taler-wallet-core/src/wallet.ts
index 6092830f6..25cfd7f6f 100644
--- a/packages/taler-wallet-core/src/wallet.ts
+++ b/packages/taler-wallet-core/src/wallet.ts
@@ -51,12 +51,15 @@ import {
   ManualWithdrawalDetails,
   MerchantUsingTemplateDetails,
   NotificationType,
+  PrepareWithdrawExchangeRequest,
+  PrepareWithdrawExchangeResponse,
   RecoverStoredBackupRequest,
   RefreshReason,
   ScopeType,
   StoredBackupList,
   TalerError,
   TalerErrorCode,
+  TalerUriAction,
   TaskThrottler,
   TestingWaitTransactionRequest,
   TransactionState,
@@ -109,6 +112,7 @@ import {
   codecForPreparePeerPushCreditRequest,
   codecForPrepareRefundRequest,
   codecForPrepareRewardRequest,
+  codecForPrepareWithdrawExchangeRequest,
   codecForRecoverStoredBackupRequest,
   codecForResumeTransaction,
   codecForRetryTransactionRequest,
@@ -133,6 +137,7 @@ import {
   j2s,
   parsePayTemplateUri,
   parsePaytoUri,
+  parseTalerUri,
   sampleWalletCoreTransactions,
   setDangerousTimetravel,
   validateIban,
@@ -1045,6 +1050,31 @@ async function recoverStoredBackup(
   logger.info(`import done`);
 }
 
+async function handlePrepareWithdrawExchange(
+  ws: InternalWalletState,
+  req: PrepareWithdrawExchangeRequest,
+): Promise<PrepareWithdrawExchangeResponse> {
+  const parsedUri = parseTalerUri(req.talerUri);
+  if (parsedUri?.type !== TalerUriAction.WithdrawExchange) {
+    throw Error("expected a taler://withdraw-exchange URI");
+  }
+  const exchangeBaseUrl = parsedUri.exchangeBaseUrl;
+  const exchange = await updateExchangeFromUrl(ws, exchangeBaseUrl);
+  if (exchange.exchangeDetails.masterPublicKey != parsedUri.exchangePub) {
+    throw Error("mismatch of exchange master public key (URI vs actual)");
+  }
+  if (parsedUri.amount) {
+    const amt = Amounts.parseOrThrow(parsedUri.amount);
+    if (amt.currency !== exchange.exchangeDetails.currency) {
+      throw Error("mismatch of currency (URI vs exchange)");
+    }
+  }
+  return {
+    exchangeBaseUrl,
+    amount: parsedUri.amount,
+  };
+}
+
 /**
  * Implementation of the "wallet-core" API.
  */
@@ -1313,7 +1343,10 @@ async function dispatchRequestInternal<Op extends WalletApiOperation>(
       const req = codecForSharePaymentRequest().decode(payload);
       return await sharePayment(ws, req.merchantBaseUrl, req.orderId);
     }
-
+    case WalletApiOperation.PrepareWithdrawExchange: {
+      const req = codecForPrepareWithdrawExchangeRequest().decode(payload);
+      return handlePrepareWithdrawExchange(ws, req);
+    }
     case WalletApiOperation.PreparePayForUri: {
       const req = codecForPreparePayRequest().decode(payload);
       return await preparePayForUri(ws, req.talerPayUri);
-- 
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