From dc016078a976e24886173dd81a028b8b3d89a1e2 Mon Sep 17 00:00:00 2001
From: Florian Dold <florian@dold.me>
Date: Wed, 6 Dec 2023 18:39:41 +0100
Subject: wallet-core: implement getExchangeEntryByUrl

---
 packages/taler-wallet-core/src/wallet-api-types.ts | 13 +++++++++
 packages/taler-wallet-core/src/wallet.ts           | 34 ++++++++++++++++++++++
 2 files changed, 47 insertions(+)

(limited to 'packages/taler-wallet-core')

diff --git a/packages/taler-wallet-core/src/wallet-api-types.ts b/packages/taler-wallet-core/src/wallet-api-types.ts
index 375bc3eac..f1a4d5acf 100644
--- a/packages/taler-wallet-core/src/wallet-api-types.ts
+++ b/packages/taler-wallet-core/src/wallet-api-types.ts
@@ -64,6 +64,8 @@ import {
   GetContractTermsDetailsRequest,
   GetCurrencySpecificationRequest,
   GetCurrencySpecificationResponse,
+  GetExchangeEntryByUrlRequest,
+  GetExchangeEntryByUrlResponse,
   GetExchangeTosRequest,
   GetExchangeTosResult,
   GetPlanForOperationRequest,
@@ -152,6 +154,7 @@ export enum WalletApiOperation {
   GetTransactionById = "getTransactionById",
   TestingGetSampleTransactions = "testingGetSampleTransactions",
   ListExchanges = "listExchanges",
+  GetExchangeEntryByUrl = "getExchangeEntryByUrl",
   ListKnownBankAccounts = "listKnownBankAccounts",
   AddKnownBankAccounts = "addKnownBankAccounts",
   ForgetKnownBankAccounts = "forgetKnownBankAccounts",
@@ -633,6 +636,15 @@ export type GetExchangeDetailedInfoOp = {
   response: ExchangeDetailedResponse;
 };
 
+/**
+ * Get the current terms of a service of an exchange.
+ */
+export type GetExchangeEntryByUrlOp = {
+  op: WalletApiOperation.GetExchangeEntryByUrl;
+  request: GetExchangeEntryByUrlRequest;
+  response: GetExchangeEntryByUrlResponse;
+};
+
 /**
  * List currencies known to the wallet.
  */
@@ -1127,6 +1139,7 @@ export type WalletOperations = {
   [WalletApiOperation.SetExchangeTosAccepted]: SetExchangeTosAcceptedOp;
   [WalletApiOperation.GetExchangeTos]: GetExchangeTosOp;
   [WalletApiOperation.GetExchangeDetailedInfo]: GetExchangeDetailedInfoOp;
+  [WalletApiOperation.GetExchangeEntryByUrl]: GetExchangeEntryByUrlOp;
   [WalletApiOperation.PrepareDeposit]: PrepareDepositOp;
   [WalletApiOperation.GenerateDepositGroupTxId]: GenerateDepositGroupTxIdOp;
   [WalletApiOperation.CreateDepositGroup]: CreateDepositGroupOp;
diff --git a/packages/taler-wallet-core/src/wallet.ts b/packages/taler-wallet-core/src/wallet.ts
index bccdf721f..e5e179937 100644
--- a/packages/taler-wallet-core/src/wallet.ts
+++ b/packages/taler-wallet-core/src/wallet.ts
@@ -42,6 +42,7 @@ import {
   ExchangesShortListResponse,
   FeeDescription,
   GetCurrencySpecificationResponse,
+  GetExchangeEntryByUrlResponse,
   GetExchangeTosResult,
   InitResponse,
   KnownBankAccounts,
@@ -89,6 +90,7 @@ import {
   codecForGetBalanceDetailRequest,
   codecForGetContractTermsDetails,
   codecForGetCurrencyInfoRequest,
+  codecForGetExchangeEntryByUrlRequest,
   codecForGetExchangeTosRequest,
   codecForGetWithdrawalDetailsForAmountRequest,
   codecForGetWithdrawalDetailsForUri,
@@ -1148,6 +1150,38 @@ async function dispatchRequestInternal<Op extends WalletApiOperation>(
     case WalletApiOperation.ListExchanges: {
       return await getExchanges(ws);
     }
+    case WalletApiOperation.GetExchangeEntryByUrl: {
+      const req = codecForGetExchangeEntryByUrlRequest().decode(payload);
+      const exchangeEntry = await ws.db
+        .mktx((x) => [
+          x.exchanges,
+          x.exchangeDetails,
+          x.denominations,
+          x.operationRetries,
+        ])
+        .runReadOnly(async (tx) => {
+          const exchangeRec = await tx.exchanges.get(req.exchangeBaseUrl);
+          if (!exchangeRec) {
+            throw Error("exchange not found");
+          }
+          const exchangeDetails = await getExchangeDetails(
+            tx,
+            exchangeRec.baseUrl,
+          );
+          const opRetryRecord = await tx.operationRetries.get(
+            TaskIdentifiers.forExchangeUpdate(exchangeRec),
+          );
+          return makeExchangeListItem(
+            exchangeRec,
+            exchangeDetails,
+            opRetryRecord?.lastError,
+          );
+        });
+      const result: GetExchangeEntryByUrlResponse = {
+        exchangeEntry,
+      };
+      return result;
+    }
     case WalletApiOperation.ListExchangesForScopedCurrency: {
       const req =
         codecForListExchangesForScopedCurrencyRequest().decode(payload);
-- 
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