CW-532-DFX-buy-provider (#1209)

* dfx buy provider ui

* fix signing flow

* fixed provider determination based on wallet type and app settings

* update localization files

* minor fix

* Fix BTC, LTC und BCH signMessages

* Add signMessage to monero

* open dfx in webview

* Update dfx_buy_provider.dart

* Revert merge conflict

* Update bitcoin_flutter ref

---------

Co-authored-by: Konstantin Ullrich <konstantinullrich12@gmail.com>

cw_bitcoin/lib/electrum_wallet.dart

@@ -725,8 +725,7 @@ abstract class ElectrumWalletBase
     final index = address != null
         ? walletAddresses.addresses.firstWhere((element) => element.address == address).index
         : null;
-    return index == null
-        ? base64Encode(hd.sign(message))
-        : base64Encode(hd.derive(index).sign(message));
+    final HD = index == null ? hd : hd.derive(index);
+    return base64Encode(HD.signMessage(message));
   }
 }

cw_bitcoin/pubspec.yaml

@@ -22,7 +22,7 @@ dependencies:
   bitcoin_flutter:
     git:
       url: https://github.com/cake-tech/bitcoin_flutter.git
-      ref: cake-update-v3
+      ref: cake-update-v4
   bitbox:
     git:
       url: https://github.com/cake-tech/bitbox-flutter.git

cw_bitcoin_cash/lib/src/bitcoin_cash_wallet.dart

@@ -302,10 +302,8 @@ abstract class BitcoinCashWalletBase extends ElectrumWallet with Store {
     final index = address != null
         ? walletAddresses.addresses
             .firstWhere((element) => element.address == AddressUtils.toLegacyAddress(address))
-            .index
-        : null;
-    return index == null
-        ? base64Encode(hd.sign(message))
-        : base64Encode(hd.derive(index).sign(message));
+            .index : null;
+    final HD = index == null ? hd : hd.derive(index);
+    return base64Encode(HD.signMessage(message));
   }
 }

cw_bitcoin_cash/pubspec.yaml

@@ -24,7 +24,7 @@ dependencies:
   bitcoin_flutter:
     git:
       url: https://github.com/cake-tech/bitcoin_flutter.git
-      ref: cake-update-v3
+      ref: cake-update-v4
   bitbox:
     git:
       url: https://github.com/cake-tech/bitbox-flutter.git

cw_monero/ios/Classes/monero_api.cpp

@@ -926,6 +926,8 @@ extern "C"
         return m_wallet->trustedDaemon();
     }
 
+    // Coin Control //
+
     CoinsInfoRow* coin(int index)
     {
         if (index >= 0 && index < m_coins_info.size()) {
@@ -1020,6 +1022,13 @@ extern "C"
         m_coins->thaw(index);
     }
 
+    // Sign Messages //
+
+    char *sign_message(char *message, char *address = "")
+    {
+        return strdup(get_current_wallet()->signMessage(std::string(message), std::string(address)).c_str());
+    }
+
 #ifdef __cplusplus
 }
 #endif

cw_monero/ios/Classes/monero_api.h

@@ -32,7 +32,8 @@ void store(char *path);
 
 void set_trusted_daemon(bool arg);
 bool trusted_daemon();
+char *sign_message(char *message, char *address);
 
 #ifdef __cplusplus
 }
-#endif
+#endif

cw_monero/lib/api/signatures.dart

@@ -149,3 +149,5 @@ typedef coin = Pointer<CoinsInfoRow> Function(Int32 index);
 typedef freeze_coin = Void Function(Int32 index);
 
 typedef thaw_coin = Void Function(Int32 index);
+
+typedef sign_message = Pointer<Utf8> Function(Pointer<Utf8> message, Pointer<Utf8> address);

cw_monero/lib/api/types.dart

@@ -149,3 +149,5 @@ typedef GetCoin = Pointer<CoinsInfoRow> Function(int);
 typedef FreezeCoin = void Function(int);
 
 typedef ThawCoin = void Function(int);
+
+typedef SignMessage = Pointer<Utf8> Function(Pointer<Utf8>, Pointer<Utf8>);

cw_monero/lib/api/wallet.dart

@@ -8,7 +8,6 @@ import 'package:cw_monero/api/types.dart';
 import 'package:cw_monero/api/monero_api.dart';
 import 'package:cw_monero/api/exceptions/setup_wallet_exception.dart';
 import 'package:flutter/foundation.dart';
-import 'package:flutter/services.dart';
 
 int _boolToInt(bool value) => value ? 1 : 0;
 
@@ -128,6 +127,10 @@ final trustedDaemonNative = moneroApi
     .lookup<NativeFunction<trusted_daemon>>('trusted_daemon')
     .asFunction<TrustedDaemon>();
 
+final signMessageNative = moneroApi
+    .lookup<NativeFunction<sign_message>>('sign_message')
+    .asFunction<SignMessage>();
+
 int getSyncingHeight() => getSyncingHeightNative();
 
 bool isNeededToRefresh() => isNeededToRefreshNative() != 0;
@@ -296,7 +299,7 @@ class SyncListener {
 
       final bchHeight = await getNodeHeightOrUpdate(syncHeight);
 
-      if (_lastKnownBlockHeight == syncHeight || syncHeight == null) {
+      if (_lastKnownBlockHeight == syncHeight) {
         return;
       }
 
@@ -311,7 +314,7 @@ class SyncListener {
       }
 
       // 1. Actual new height; 2. Blocks left to finish; 3. Progress in percents;
-      onNewBlock?.call(syncHeight, left, ptc);
+      onNewBlock.call(syncHeight, left, ptc);
     });
   }
 
@@ -382,4 +385,15 @@ String getSubaddressLabel(int accountIndex, int addressIndex) {
 
 Future setTrustedDaemon(bool trusted) async => setTrustedDaemonNative(_boolToInt(trusted));
 
-Future<bool> trustedDaemon() async => trustedDaemonNative() != 0;
+Future<bool> trustedDaemon() async => trustedDaemonNative() != 0;
+
+String signMessage(String message, {String address = ""}) {
+  final messagePointer = message.toNativeUtf8();
+  final addressPointer = address.toNativeUtf8();
+
+  final signature = convertUTF8ToString(pointer: signMessageNative(messagePointer, addressPointer));
+  calloc.free(messagePointer);
+  calloc.free(addressPointer);
+
+  return signature;
+}

cw_monero/lib/monero_wallet.dart

@@ -651,4 +651,10 @@ abstract class MoneroWalletBase
 
   @override
   void setExceptionHandler(void Function(FlutterErrorDetails) onError) => _onError = onError;
+
+  @override
+  String signMessage(String message, {String? address}) {
+    final useAddress = address ?? "";
+    return monero_wallet.signMessage(message, address: useAddress);
+  }
 }

cw_monero/macos/Classes/monero_api.cpp

@@ -1020,6 +1020,13 @@ extern "C"
         m_coins->thaw(index);
     }
 
+    // Sign Messages //
+
+    char *sign_message(char *message, char *address = "")
+    {
+        return strdup(get_current_wallet()->signMessage(std::string(message), std::string(address)).c_str());
+    }
+
 #ifdef __cplusplus
 }
 #endif

cw_monero/macos/Classes/monero_api.h

@@ -32,7 +32,8 @@ void store(char *path);
 
 void set_trusted_daemon(bool arg);
 bool trusted_daemon();
+char *sign_message(char *message, char *address);
 
 #ifdef __cplusplus
 }
-#endif
+#endif

lib/buy/dfx/dfx_buy_provider.dart

@@ -0,0 +1,179 @@
+import 'dart:convert';
+
+import 'package:cake_wallet/generated/i18n.dart';
+import 'package:cake_wallet/routes.dart';
+import 'package:cake_wallet/src/widgets/alert_with_one_action.dart';
+import 'package:cake_wallet/utils/device_info.dart';
+import 'package:cake_wallet/utils/show_pop_up.dart';
+import 'package:cw_core/wallet_base.dart';
+import 'package:cw_core/wallet_type.dart';
+import 'package:flutter/material.dart';
+import 'package:http/http.dart' as http;
+import 'package:url_launcher/url_launcher.dart';
+
+class DFXBuyProvider {
+  DFXBuyProvider({required WalletBase wallet}) : this._wallet = wallet;
+
+  final WalletBase _wallet;
+
+  static const _baseUrl = 'api.dfx.swiss';
+  static const _authPath = '/v1/auth/signMessage';
+  static const _signUpPath = '/v1/auth/signUp';
+  static const _signInPath = '/v1/auth/signIn';
+  static const walletName = 'CakeWallet';
+
+  String get assetOut {
+    switch (_wallet.type) {
+      case WalletType.bitcoin:
+        return 'BTC';
+      case WalletType.bitcoinCash:
+        return 'BCH';
+      case WalletType.litecoin:
+        return 'LTC';
+      case WalletType.monero:
+        return 'XMR';
+      case WalletType.ethereum:
+        return 'ETH';
+      default:
+        throw Exception("WalletType is not available for DFX ${_wallet.type}");
+    }
+  }
+
+  String get blockchain {
+    switch (_wallet.type) {
+      case WalletType.bitcoin:
+      case WalletType.bitcoinCash:
+      case WalletType.litecoin:
+        return 'Bitcoin';
+      case WalletType.monero:
+        return 'Monero';
+      case WalletType.ethereum:
+        return 'Ethereum';
+      default:
+        throw Exception("WalletType is not available for DFX ${_wallet.type}");
+    }
+  }
+
+  Future<String> getSignMessage() async {
+    final walletAddress = _wallet.walletAddresses.address;
+    final uri = Uri.https(_baseUrl, _authPath, {'address': walletAddress});
+
+    var response = await http.get(uri, headers: {'accept': 'application/json'});
+
+    if (response.statusCode == 200) {
+      final responseBody = jsonDecode(response.body);
+      return responseBody['message'] as String;
+    } else {
+      throw Exception(
+          'Failed to get sign message. Status: ${response.statusCode} ${response.body}');
+    }
+  }
+
+  Future<String> signUp() async {
+    final signMessage = getSignature(await getSignMessage());
+    final walletAddress = _wallet.walletAddresses.address;
+
+    final requestBody = jsonEncode({
+      'wallet': walletName,
+      'address': walletAddress,
+      'signature': signMessage,
+    });
+
+    final uri = Uri.https(_baseUrl, _signUpPath);
+    var response = await http.post(uri,
+        headers: {'Content-Type': 'application/json'}, body: requestBody);
+
+    if (response.statusCode == 201) {
+      final responseBody = jsonDecode(response.body);
+      return responseBody['accessToken'] as String;
+    } else {
+      throw Exception(
+          'Failed to sign up. Status: ${response.statusCode} ${response.body}');
+    }
+  }
+
+  Future<String> signIn() async {
+    final signMessage = getSignature(await getSignMessage());
+    final walletAddress = _wallet.walletAddresses.address;
+
+    final requestBody = jsonEncode({
+      'address': walletAddress,
+      'signature': signMessage,
+    });
+
+    final uri = Uri.https(_baseUrl, _signInPath);
+    var response = await http.post(uri,
+        headers: {'Content-Type': 'application/json'}, body: requestBody);
+
+    if (response.statusCode == 201) {
+      final responseBody = jsonDecode(response.body);
+      return responseBody['accessToken'] as String;
+    } else {
+      throw Exception(
+          'Failed to sign in. Status: ${response.statusCode} ${response.body}');
+    }
+  }
+
+  String getSignature(String message) {
+    switch (_wallet.type) {
+      case WalletType.ethereum:
+        return _wallet.signMessage(message);
+      case WalletType.monero:
+      case WalletType.litecoin:
+      case WalletType.bitcoin:
+      case WalletType.bitcoinCash:
+        return _wallet.signMessage(message,
+            address: _wallet.walletAddresses.address);
+      default:
+        throw Exception("WalletType is not available for DFX ${_wallet.type}");
+    }
+  }
+
+  Future<void> launchProvider(BuildContext context) async {
+    try {
+      final assetOut = this.assetOut;
+      final blockchain = this.blockchain;
+
+      String accessToken;
+
+      try {
+        accessToken = await signUp();
+      } on Exception catch (e) {
+        if (e.toString().contains('409')) {
+          accessToken = await signIn();
+        } else {
+          rethrow;
+        }
+      }
+
+      final uri = Uri.https('services.dfx.swiss', '/buy', {
+        'session': accessToken,
+        'lang': 'en',
+        'asset-out': assetOut,
+        'blockchain': blockchain,
+        'asset-in': 'EUR',
+      });
+
+      if (await canLaunchUrl(uri)) {
+        if (DeviceInfo.instance.isMobile) {
+          Navigator.of(context).pushNamed(Routes.webViewPage,
+              arguments: [S.of(context).buy, uri]);
+        } else {
+          await launchUrl(uri, mode: LaunchMode.externalApplication);
+        }
+      } else {
+        throw Exception('Could not launch URL');
+      }
+    } catch (e) {
+      await showPopUp<void>(
+          context: context,
+          builder: (BuildContext context) {
+            return AlertWithOneAction(
+                alertTitle: "DFX Connect",
+                alertContent: S.of(context).buy_provider_unavailable + ': $e',
+                buttonText: S.of(context).ok,
+                buttonAction: () => Navigator.of(context).pop());
+          });
+    }
+  }
+}

lib/di.dart

@@ -227,6 +227,7 @@ import 'package:cake_wallet/core/wallet_loading_service.dart';
 import 'package:cw_core/crypto_currency.dart';
 import 'package:cake_wallet/entities/qr_view_data.dart';
 
+import 'buy/dfx/dfx_buy_provider.dart';
 import 'core/totp_request_details.dart';
 import 'src/screens/settings/desktop_settings/desktop_settings_page.dart';
 
@@ -795,6 +796,9 @@ Future<void> setup({
   getIt.registerFactory<RobinhoodBuyProvider>(
       () => RobinhoodBuyProvider(wallet: getIt.get<AppStore>().wallet!));
 
+  getIt.registerFactory<DFXBuyProvider>(
+          () => DFXBuyProvider(wallet: getIt.get<AppStore>().wallet!));
+
   getIt.registerFactory<OnRamperBuyProvider>(() => OnRamperBuyProvider(
         settingsStore: getIt.get<AppStore>().settingsStore,
         wallet: getIt.get<AppStore>().wallet!,
@@ -940,7 +944,7 @@ Future<void> setup({
 
   getIt.registerFactory(() => BuyAmountViewModel());
 
-  getIt.registerFactory(() => BuyOptionsPage());
+  getIt.registerFactory(() => BuyOptionsPage(getIt.get<DashboardViewModel>()));
 
   getIt.registerFactory(() {
     final wallet = getIt.get<AppStore>().wallet;

lib/entities/buy_provider_types.dart

@@ -1,9 +1,11 @@
 import 'package:cake_wallet/generated/i18n.dart';
+import 'package:cw_core/wallet_type.dart';
 
 enum BuyProviderType {
   AskEachTime,
   Robinhood,
-  Onramper;
+  Onramper,
+  DFX;
 
   @override
   String toString() {
@@ -14,6 +16,42 @@ enum BuyProviderType {
         return "Robinhood";
       case BuyProviderType.Onramper:
         return "Onramper";
+      case BuyProviderType.DFX:
+        return "DFX";
+    }
+  }
+
+  static List<BuyProviderType> getAvailableProviders(WalletType walletType) {
+    switch (walletType) {
+      case WalletType.nano:
+      case WalletType.banano:
+        return [
+          BuyProviderType.AskEachTime,
+          BuyProviderType.Onramper
+        ];
+      case WalletType.monero:
+        return [
+          BuyProviderType.AskEachTime,
+          BuyProviderType.Onramper,
+          BuyProviderType.DFX
+        ];
+      case WalletType.bitcoin:
+      case WalletType.ethereum:
+        return [
+          BuyProviderType.AskEachTime,
+          BuyProviderType.Onramper,
+          BuyProviderType.DFX,
+          BuyProviderType.Robinhood
+        ];
+      case WalletType.litecoin:
+      case WalletType.bitcoinCash:
+      return [
+        BuyProviderType.AskEachTime,
+        BuyProviderType.Onramper,
+        BuyProviderType.Robinhood
+      ];
+      default:
+        return [];
     }
   }
 }

lib/entities/main_actions.dart

@@ -1,3 +1,4 @@
+import 'package:cake_wallet/buy/dfx/dfx_buy_provider.dart';
 import 'package:cake_wallet/buy/moonpay/moonpay_buy_provider.dart';
 import 'package:cake_wallet/buy/onramper/onramper_buy_provider.dart';
 import 'package:cake_wallet/buy/robinhood/robinhood_buy_provider.dart';
@@ -44,48 +45,54 @@ class MainActions {
     isEnabled: (viewModel) => viewModel.isEnabledBuyAction,
     canShow: (viewModel) => viewModel.hasBuyAction,
     onTap: (BuildContext context, DashboardViewModel viewModel) async {
+      if (!viewModel.isEnabledBuyAction) {
+        await _showErrorDialog(context, S.of(context).unsupported_asset);
+        return;
+      }
+
       final defaultBuyProvider = viewModel.defaultBuyProvider;
-      final walletType = viewModel.type;
-
-      if (!viewModel.isEnabledBuyAction) return;
-
-      switch (walletType) {
-        case WalletType.bitcoin:
-        case WalletType.litecoin:
-        case WalletType.ethereum:
-        case WalletType.polygon:
-        case WalletType.bitcoinCash:
-          switch (defaultBuyProvider) {
-            case BuyProviderType.AskEachTime:
-              Navigator.pushNamed(context, Routes.buy);
-              break;
-            case BuyProviderType.Onramper:
-              await getIt.get<OnRamperBuyProvider>().launchProvider(context);
-              break;
-            case BuyProviderType.Robinhood:
-              await getIt.get<RobinhoodBuyProvider>().launchProvider(context);
-              break;
-          }
-          break;
-        case WalletType.nano:
-        case WalletType.banano:
-        case WalletType.monero:
-          await getIt.get<OnRamperBuyProvider>().launchProvider(context);
-          break;
-        default:
-          await showPopUp<void>(
-              context: context,
-              builder: (BuildContext context) {
-                return AlertWithOneAction(
-                    alertTitle: S.of(context).buy,
-                    alertContent: S.of(context).unsupported_asset,
-                    buttonText: S.of(context).ok,
-                    buttonAction: () => Navigator.of(context).pop());
-              });
+      try {
+        await _launchProviderByType(context, defaultBuyProvider);
+      } catch (e) {
+        await _showErrorDialog(context, e.toString());
       }
     },
   );
 
+  static Future<void> _launchProviderByType(BuildContext context, BuyProviderType providerType) async {
+    switch (providerType) {
+      case BuyProviderType.AskEachTime:
+        Navigator.pushNamed(context, Routes.buy);
+        break;
+      case BuyProviderType.Onramper:
+        await getIt.get<OnRamperBuyProvider>().launchProvider(context);
+        break;
+      case BuyProviderType.Robinhood:
+        await getIt.get<RobinhoodBuyProvider>().launchProvider(context);
+        break;
+      case BuyProviderType.DFX:
+        await getIt.get<DFXBuyProvider>().launchProvider(context);
+        break;
+      default:
+        throw UnsupportedError('Unsupported buy provider type');
+    }
+  }
+
+
+  static Future<void> _showErrorDialog(BuildContext context, String errorMessage) async {
+    await showPopUp<void>(
+      context: context,
+      builder: (BuildContext context) {
+        return AlertWithOneAction(
+          alertTitle: S.of(context).buy,
+          alertContent: errorMessage,
+          buttonText: S.of(context).ok,
+          buttonAction: () => Navigator.of(context).pop(),
+        );
+      },
+    );
+  }
+
   static MainActions receiveAction = MainActions._(
     name: (context) => S.of(context).receive,
     image: 'assets/images/received.png',

lib/src/screens/buy/buy_options_page.dart

@@ -1,18 +1,26 @@
+import 'package:cake_wallet/buy/dfx/dfx_buy_provider.dart';
 import 'package:cake_wallet/buy/onramper/onramper_buy_provider.dart';
 import 'package:cake_wallet/buy/robinhood/robinhood_buy_provider.dart';
 import 'package:cake_wallet/di.dart';
+import 'package:cake_wallet/entities/buy_provider_types.dart';
 import 'package:cake_wallet/generated/i18n.dart';
 import 'package:cake_wallet/src/screens/base_page.dart';
 import 'package:cake_wallet/src/widgets/option_tile.dart';
 import 'package:cake_wallet/themes/extensions/option_tile_theme.dart';
 import 'package:cake_wallet/themes/extensions/transaction_trade_theme.dart';
+import 'package:cake_wallet/view_model/dashboard/dashboard_view_model.dart';
 import 'package:flutter/material.dart';
 
 class BuyOptionsPage extends BasePage {
+  BuyOptionsPage(this.dashboardViewModel);
+
+  final DashboardViewModel dashboardViewModel;
   final iconDarkRobinhood = 'assets/images/robinhood_dark.png';
   final iconLightRobinhood = 'assets/images/robinhood_light.png';
   final iconDarkOnramper = 'assets/images/onramper_dark.png';
   final iconLightOnramper = 'assets/images/onramper_light.png';
+  final iconDarkDFX = 'assets/images/dfx_dark.png';
+  final iconLightDFX = 'assets/images/dfx_light.png';
 
   @override
   String get title => S.current.buy;
@@ -22,11 +30,19 @@ class BuyOptionsPage extends BasePage {
 
   @override
   Widget body(BuildContext context) {
-    final isLightMode = Theme.of(context).extension<OptionTileTheme>()?.useDarkImage ?? false;
-    final iconRobinhood =
-        Image.asset(isLightMode ? iconLightRobinhood : iconDarkRobinhood, height: 40, width: 40);
-    final iconOnramper =
-        Image.asset(isLightMode ? iconLightOnramper : iconDarkOnramper, height: 40, width: 40);
+    final isLightMode =
+        Theme.of(context).extension<OptionTileTheme>()?.useDarkImage ?? false;
+    final iconRobinhood = Image.asset(
+        isLightMode ? iconLightRobinhood : iconDarkRobinhood,
+        height: 40,
+        width: 40);
+    final iconOnramper = Image.asset(
+        isLightMode ? iconLightOnramper : iconDarkOnramper,
+        height: 40,
+        width: 40);
+    final iconDFX = Image.asset(isLightMode ? iconLightDFX : iconDarkDFX,
+        height: 40, width: 40);
+    final availableProviders = dashboardViewModel.availableProviders;
 
     return Container(
       child: Center(
@@ -34,26 +50,42 @@ class BuyOptionsPage extends BasePage {
           constraints: BoxConstraints(maxWidth: 330),
           child: Column(
             children: [
-              Padding(
-                padding: EdgeInsets.only(top: 24),
-                child: OptionTile(
-                  image: iconOnramper,
-                  title: "Onramper",
-                  description: S.of(context).onramper_option_description,
-                  onPressed: () async =>
-                      await getIt.get<OnRamperBuyProvider>().launchProvider(context),
+              if (availableProviders.contains(BuyProviderType.Onramper))
+                Padding(
+                  padding: EdgeInsets.only(top: 24),
+                  child: OptionTile(
+                    image: iconOnramper,
+                    title: "Onramper",
+                    description: S.of(context).onramper_option_description,
+                    onPressed: () async => await getIt
+                        .get<OnRamperBuyProvider>()
+                        .launchProvider(context),
+                  ),
                 ),
-              ),
-              Padding(
-                padding: EdgeInsets.only(top: 24),
-                child: OptionTile(
-                  image: iconRobinhood,
-                  title: "Robinhood Connect",
-                  description: S.of(context).robinhood_option_description,
-                  onPressed: () async =>
-                  await getIt.get<RobinhoodBuyProvider>().launchProvider(context),
+              if (availableProviders.contains(BuyProviderType.Robinhood))
+                Padding(
+                  padding: EdgeInsets.only(top: 24),
+                  child: OptionTile(
+                    image: iconRobinhood,
+                    title: "Robinhood Connect",
+                    description: S.of(context).robinhood_option_description,
+                    onPressed: () async => await getIt
+                        .get<RobinhoodBuyProvider>()
+                        .launchProvider(context),
+                  ),
+                ),
+              if (availableProviders.contains(BuyProviderType.DFX))
+                Padding(
+                  padding: EdgeInsets.only(top: 24),
+                  child: OptionTile(
+                    image: iconDFX,
+                    title: "DFX Connect",
+                    description: S.of(context).dfx_option_description,
+                    onPressed: () async => await getIt
+                        .get<DFXBuyProvider>()
+                        .launchProvider(context),
+                  ),
                 ),
-              ),
               Spacer(),
               Padding(
                 padding: EdgeInsets.fromLTRB(24, 24, 24, 32),
@@ -63,7 +95,9 @@ class BuyOptionsPage extends BasePage {
                   style: TextStyle(
                     fontSize: 14,
                     fontWeight: FontWeight.normal,
-                    color: Theme.of(context).extension<TransactionTradeTheme>()!.detailsTitlesColor,
+                    color: Theme.of(context)
+                        .extension<TransactionTradeTheme>()!
+                        .detailsTitlesColor,
                   ),
                 ),
               ),

lib/src/screens/settings/other_settings_page.dart

@@ -1,5 +1,3 @@
-import 'package:cake_wallet/buy/buy_provider.dart';
-import 'package:cake_wallet/entities/buy_provider_types.dart';
 import 'package:cake_wallet/entities/priority_for_wallet_type.dart';
 import 'package:cake_wallet/generated/i18n.dart';
 import 'package:cake_wallet/routes.dart';
@@ -42,9 +40,10 @@ class OtherSettingsPage extends BasePage {
                   handler: (BuildContext context) =>
                       Navigator.of(context).pushNamed(Routes.changeRep),
                 ),
+              if(_otherSettingsViewModel.isEnabledBuyAction)
               SettingsPickerCell(
                 title: S.current.default_buy_provider,
-                items: BuyProviderType.values,
+                items: _otherSettingsViewModel.availableBuyProviders,
                 displayItem: _otherSettingsViewModel.getBuyProviderType,
                 selectedItem: _otherSettingsViewModel.buyProviderType,
                 onItemSelected: _otherSettingsViewModel.onBuyProviderTypeSelected,

lib/store/settings_store.dart

@@ -36,7 +36,6 @@ import 'package:cake_wallet/monero/monero.dart';
 import 'package:cake_wallet/entities/action_list_display_mode.dart';
 import 'package:cake_wallet/entities/fiat_api_mode.dart';
 import 'package:cw_core/set_app_secure_native.dart';
-
 part 'settings_store.g.dart';
 
 class SettingsStore = SettingsStoreBase with _$SettingsStore;
@@ -123,7 +122,6 @@ abstract class SettingsStoreBase with Store {
         isAppSecure = initialAppSecure,
         disableBuy = initialDisableBuy,
         disableSell = initialDisableSell,
-        defaultBuyProvider = initialDefaultBuyProvider,
         shouldShowMarketPlaceInDashboard = initialShouldShowMarketPlaceInDashboard,
         exchangeStatus = initialExchangeStatus,
         currentTheme = initialTheme,
@@ -178,6 +176,12 @@ abstract class SettingsStoreBase with Store {
 
     initializeTrocadorProviderStates();
 
+    WalletType.values.forEach((walletType) {
+      final key = 'defaultBuyProvider_${walletType.toString()}';
+      final providerIndex = sharedPreferences.getInt(key);
+      defaultBuyProviders[walletType] = providerIndex != null ? BuyProviderType.values[providerIndex] : BuyProviderType.AskEachTime;
+    });
+
     reaction(
         (_) => fiatCurrency,
         (FiatCurrency fiatCurrency) => sharedPreferences.setString(
@@ -244,9 +248,14 @@ abstract class SettingsStoreBase with Store {
             sharedPreferences.setBool(PreferencesKey.disableSellKey, disableSell));
 
     reaction(
-        (_) => defaultBuyProvider,
-        (BuyProviderType defaultBuyProvider) =>
-            sharedPreferences.setInt(PreferencesKey.defaultBuyProvider, defaultBuyProvider.index));
+            (_) => defaultBuyProviders.asObservable(),
+            (ObservableMap<WalletType, BuyProviderType> providers) {
+          providers.forEach((walletType, provider) {
+            final key = 'defaultBuyProvider_${walletType.toString()}';
+            sharedPreferences.setInt(key, provider.index);
+          });
+        }
+    );
 
     reaction(
         (_) => autoGenerateSubaddressStatus,
@@ -333,6 +342,7 @@ abstract class SettingsStoreBase with Store {
 
     reaction((_) => totpSecretKey,
         (String totpKey) => sharedPreferences.setString(PreferencesKey.totpSecretKey, totpKey));
+
     reaction(
         (_) => numberOfFailedTokenTrials,
         (int failedTokenTrail) =>
@@ -494,9 +504,6 @@ abstract class SettingsStoreBase with Store {
   @observable
   bool disableSell;
 
-  @observable
-  BuyProviderType defaultBuyProvider;
-
   @observable
   bool allowBiometricalAuthentication;
 
@@ -566,6 +573,9 @@ abstract class SettingsStoreBase with Store {
   @observable
   ObservableMap<String, bool> trocadorProviderStates = ObservableMap<String, bool>();
 
+  @observable
+  ObservableMap<WalletType, BuyProviderType> defaultBuyProviders = ObservableMap<WalletType, BuyProviderType>();
+
   @observable
   SortBalanceBy sortBalanceBy;
 
@@ -1003,8 +1013,6 @@ abstract class SettingsStoreBase with Store {
     isAppSecure = sharedPreferences.getBool(PreferencesKey.isAppSecureKey) ?? isAppSecure;
     disableBuy = sharedPreferences.getBool(PreferencesKey.disableBuyKey) ?? disableBuy;
     disableSell = sharedPreferences.getBool(PreferencesKey.disableSellKey) ?? disableSell;
-    defaultBuyProvider =
-        BuyProviderType.values[sharedPreferences.getInt(PreferencesKey.defaultBuyProvider) ?? 0];
     allowBiometricalAuthentication =
         sharedPreferences.getBool(PreferencesKey.allowBiometricalAuthenticationKey) ??
             allowBiometricalAuthentication;

lib/view_model/dashboard/dashboard_view_model.dart

@@ -282,10 +282,14 @@ abstract class DashboardViewModelBase with Store {
 
   Map<String, List<FilterItem>> filterItems;
 
-  BuyProviderType get defaultBuyProvider => settingsStore.defaultBuyProvider;
+  BuyProviderType get defaultBuyProvider =>
+      settingsStore.defaultBuyProviders[wallet.type] ??
+          BuyProviderType.AskEachTime;
 
   bool get isBuyEnabled => settingsStore.isBitcoinBuyEnabled;
 
+  List<BuyProviderType> get availableProviders => BuyProviderType.getAvailableProviders(wallet.type);
+
   bool get shouldShowYatPopup => settingsStore.shouldShowYatPopup;
 
   @action

lib/view_model/settings/other_settings_view_model.dart

@@ -13,14 +13,15 @@ import 'package:package_info/package_info.dart';
 
 part 'other_settings_view_model.g.dart';
 
-class OtherSettingsViewModel = OtherSettingsViewModelBase with _$OtherSettingsViewModel;
+class OtherSettingsViewModel = OtherSettingsViewModelBase
+    with _$OtherSettingsViewModel;
 
 abstract class OtherSettingsViewModelBase with Store {
   OtherSettingsViewModelBase(this._settingsStore, this._wallet)
       : walletType = _wallet.type,
         currentVersion = '' {
-    PackageInfo.fromPlatform()
-        .then((PackageInfo packageInfo) => currentVersion = packageInfo.version);
+    PackageInfo.fromPlatform().then(
+        (PackageInfo packageInfo) => currentVersion = packageInfo.version);
 
     final priority = _settingsStore.priority[_wallet.type];
     final priorities = priorityForWalletType(_wallet.type);
@@ -31,7 +32,8 @@ abstract class OtherSettingsViewModelBase with Store {
   }
 
   final WalletType walletType;
-  final WalletBase<Balance, TransactionHistoryBase<TransactionInfo>, TransactionInfo> _wallet;
+  final WalletBase<Balance, TransactionHistoryBase<TransactionInfo>,
+      TransactionInfo> _wallet;
 
   @observable
   String currentVersion;
@@ -50,15 +52,19 @@ abstract class OtherSettingsViewModelBase with Store {
   }
 
   @computed
-  bool get changeRepresentativeEnabled {
-    if (_wallet.type == WalletType.nano || _wallet.type == WalletType.banano) {
-      return true;
-    }
+  bool get changeRepresentativeEnabled =>
+      _wallet.type == WalletType.nano || _wallet.type == WalletType.banano;
 
-    return false;
-  }
-  
-  BuyProviderType get buyProviderType { return _settingsStore.defaultBuyProvider; }
+  @computed
+  bool get isEnabledBuyAction =>
+      !_settingsStore.disableBuy && _wallet.type != WalletType.haven;
+
+  List<BuyProviderType> get availableBuyProviders =>
+      BuyProviderType.getAvailableProviders(walletType);
+
+  BuyProviderType get buyProviderType =>
+      _settingsStore.defaultBuyProviders[walletType] ??
+      BuyProviderType.AskEachTime;
 
   String getDisplayPriority(dynamic priority) {
     final _priority = priority as TransactionPriority;
@@ -73,7 +79,7 @@ abstract class OtherSettingsViewModelBase with Store {
     return priority.toString();
   }
 
-  String getBuyProviderType (dynamic buyProviderType) {
+  String getBuyProviderType(dynamic buyProviderType) {
     final _buyProviderType = buyProviderType as BuyProviderType;
 
     return _buyProviderType.toString();
@@ -83,6 +89,5 @@ abstract class OtherSettingsViewModelBase with Store {
       _settingsStore.priority[_wallet.type] = priority;
 
   void onBuyProviderTypeSelected(BuyProviderType buyProviderType) =>
-      _settingsStore.defaultBuyProvider = buyProviderType;
-
+      _settingsStore.defaultBuyProviders[walletType] = buyProviderType;
 }

pubspec_base.yaml

@@ -96,7 +96,7 @@ dependencies:
   bitcoin_flutter:
     git:
       url: https://github.com/cake-tech/bitcoin_flutter.git
-      ref: cake-update-v3
+      ref: cake-update-v4
   fluttertoast: 8.1.4
 #  tor:
 #    git:

res/values/strings_ar.arb

@@ -746,5 +746,6 @@
   "seed_language_czech": "التشيكية",
   "seed_language_korean": "الكورية",
   "seed_language_chinese_traditional": "تقاليد صينية)",
+  "dfx_option_description": "ﺎﺑﻭﺭﻭﺃ ﻲﻓ ﺕﺎﻛﺮﺸﻟﺍﻭ ﺔﺋﺰﺠﺘﻟﺍ ءﻼﻤﻌﻟ .ﻲﻓﺎﺿﺇ KYC ﻥﻭﺪﺑ ﻭﺭﻮﻳ 990 ﻰﻟﺇ ﻞﺼﻳ ﺎﻣ .ﻱﺮﺴﻳﻮﺴﻟﺍ",
   "polygonscan_history": "ﻥﺎﻜﺴﻧﻮﺠﻴﻟﻮﺑ ﺦﻳﺭﺎﺗ"
 }

res/values/strings_bg.arb

@@ -742,5 +742,6 @@
   "seed_language_czech": "Чех",
   "seed_language_korean": "Корейски",
   "seed_language_chinese_traditional": "Традиционен китайски)",
+  "dfx_option_description": "Купете крипто с EUR и CHF. До 990 € без допълнителен KYC. За клиенти на дребно и корпоративни клиенти в Европа",
   "polygonscan_history": "История на PolygonScan"
 }

res/values/strings_cs.arb

@@ -742,5 +742,6 @@
   "seed_language_czech": "čeština",
   "seed_language_korean": "korejština",
   "seed_language_chinese_traditional": "Číňan (tradiční)",
+  "dfx_option_description": "Nakupujte kryptoměny za EUR a CHF. Až 990 € bez dalších KYC. Pro maloobchodní a firemní zákazníky v Evropě",
   "polygonscan_history": "Historie PolygonScan"
 }

res/values/strings_de.arb

@@ -750,5 +750,6 @@
   "seed_language_czech": "Tschechisch",
   "seed_language_korean": "Koreanisch",
   "seed_language_chinese_traditional": "Chinesisch (Traditionell)",
+  "dfx_option_description": "Krypto mit EUR und CHF kaufen. Bis zu 990€ ohne zusätzliches KYC. Für Privat- und Firmenkunden in Europa",
   "polygonscan_history": "PolygonScan-Verlauf"
 }

res/values/strings_en.arb

@@ -751,5 +751,6 @@
   "seed_language_czech": "Czech",
   "seed_language_korean": "Korean",
   "seed_language_chinese_traditional": "Chinese (Traditional)",
+  "dfx_option_description": "Buy crypto with EUR & CHF. Up to 990€ without additional KYC. For retail and corporate customers in Europe",
   "polygonscan_history": "PolygonScan history"
 }

res/values/strings_es.arb

@@ -749,6 +749,8 @@
   "seedtype_polyseed": "Polieta (16 palabras)",
   "seed_language_czech": "checo",
   "seed_language_korean": "coreano",
+  "seed_language_chinese_traditional": "Chino tradicional)",
+  "dfx_option_description": "Compre criptomonedas con EUR y CHF. Hasta 990€ sin KYC adicional. Para clientes minoristas y corporativos en Europa",
   "seed_language_chinese_traditional": "Chino (tradicional)",
   "polygonscan_history": "Historial de PolygonScan"
 }

res/values/strings_fr.arb

@@ -750,5 +750,6 @@
   "seed_language_czech": "tchèque",
   "seed_language_korean": "coréen",
   "seed_language_chinese_traditional": "Chinois (Traditionnel)",
+  "dfx_option_description": "Achetez des crypto-monnaies avec EUR et CHF. Jusqu'à 990€ sans KYC supplémentaire. Pour les clients particuliers et entreprises en Europe",
   "polygonscan_history": "Historique de PolygonScan"
 }

res/values/strings_ha.arb

@@ -728,5 +728,6 @@
   "seed_language_czech": "Czech",
   "seed_language_korean": "Yaren Koriya",
   "seed_language_chinese_traditional": "Sinanci (na gargajiya)",
+  "dfx_option_description": "Sayi crypto tare da EUR & CHF. Har zuwa € 990 ba tare da ƙarin KYC ba. Don 'yan kasuwa da abokan ciniki na kamfanoni a Turai",
   "polygonscan_history": "PolygonScan tarihin kowane zamani"
 }

res/values/strings_hi.arb

@@ -750,5 +750,6 @@
   "seed_language_czech": "चेक",
   "seed_language_korean": "कोरियाई",
   "seed_language_chinese_traditional": "चीनी पारंपरिक)",
+  "dfx_option_description": "EUR और CHF के साथ क्रिप्टो खरीदें। अतिरिक्त केवाईसी के बिना 990€ तक। यूरोप में खुदरा और कॉर्पोरेट ग्राहकों के लिए",
   "polygonscan_history": "पॉलीगॉनस्कैन इतिहास"
 }

res/values/strings_hr.arb

@@ -747,6 +747,8 @@
   "seedtype_polyseed": "Poliseed (16 riječi)",
   "seed_language_czech": "češki",
   "seed_language_korean": "korejski",
+  "seed_language_chinese_traditional": "Kinesko tradicionalno)",
+  "dfx_option_description": "Kupujte kripto s EUR i CHF. Do 990 € bez dodatnog KYC-a. Za maloprodajne i poslovne korisnike u Europi",
   "seed_language_chinese_traditional": "Kinesko (tradicionalno)",
   "polygonscan_history": "Povijest PolygonScan"
 }

res/values/strings_id.arb

@@ -737,6 +737,8 @@
   "seedtype_polyseed": "Polyseed (16 kata)",
   "seed_language_czech": "Ceko",
   "seed_language_korean": "Korea",
+  "seed_language_chinese_traditional": "Cina tradisional)",
+  "dfx_option_description": "Beli kripto dengan EUR & CHF. Hingga 990€ tanpa KYC tambahan. Untuk pelanggan ritel dan korporat di Eropa",
   "seed_language_chinese_traditional": "Cina (tradisional)",
   "polygonscan_history": "Sejarah PolygonScan"
 }

res/values/strings_it.arb

@@ -750,5 +750,6 @@
   "seed_language_czech": "ceco",
   "seed_language_korean": "coreano",
   "seed_language_chinese_traditional": "Cinese tradizionale)",
+  "dfx_option_description": "Acquista criptovalute con EUR e CHF. Fino a 990€ senza KYC aggiuntivi. Per clienti al dettaglio e aziendali in Europa",
   "polygonscan_history": "Cronologia PolygonScan"
 }

res/values/strings_ja.arb

@@ -750,5 +750,6 @@
   "seed_language_czech": "チェコ",
   "seed_language_korean": "韓国語",
   "seed_language_chinese_traditional": "中国の伝統的な）",
+  "dfx_option_description": "EUR と CHF で暗号通貨を購入します。追加のKYCなしで最大990ユーロ。ヨーロッパの小売および法人顧客向け",
   "polygonscan_history": "ポリゴンスキャン履歴"
 }

res/values/strings_ko.arb

@@ -748,5 +748,6 @@
   "seed_language_czech": "체코 사람",
   "seed_language_korean": "한국인",
   "seed_language_chinese_traditional": "중국 전통)",
+  "dfx_option_description": "EUR 및 CHF로 암호화폐를 구매하세요. 추가 KYC 없이 최대 990€. 유럽의 소매 및 기업 고객용",
   "polygonscan_history": "다각형 스캔 기록"
 }

res/values/strings_my.arb

@@ -748,5 +748,6 @@
   "seed_language_czech": "ချက်",
   "seed_language_korean": "ကိုးရီးယား",
   "seed_language_chinese_traditional": "တရုတ်ရိုးရာ)",
+  "dfx_option_description": "EUR & CHF ဖြင့် crypto ကိုဝယ်ပါ။ အပို KYC မပါဘဲ 990€ အထိ။ ဥရောပရှိ လက်လီရောင်းချသူများနှင့် ကော်ပိုရိတ်ဖောက်သည်များအတွက်",
   "polygonscan_history": "PolygonScan မှတ်တမ်း"
 }

res/values/strings_nl.arb

@@ -749,6 +749,8 @@
   "seedtype_polyseed": "Polyseed (16 woorden)",
   "seed_language_czech": "Tsjechisch",
   "seed_language_korean": "Koreaans",
+  "seed_language_chinese_traditional": "Chinese traditionele)",
+  "dfx_option_description": "Koop crypto met EUR & CHF. Tot 990€ zonder extra KYC. Voor particuliere en zakelijke klanten in Europa",
   "seed_language_chinese_traditional": "Chinese (traditionele)",
   "polygonscan_history": "PolygonScan-geschiedenis"
 }

res/values/strings_pl.arb

@@ -750,5 +750,6 @@
   "seed_language_czech": "Czech",
   "seed_language_korean": "koreański",
   "seed_language_chinese_traditional": "Chiński tradycyjny)",
+  "dfx_option_description": "Kupuj kryptowaluty za EUR i CHF. Do 990 € bez dodatkowego KYC. Dla klientów detalicznych i korporacyjnych w Europie",
   "polygonscan_history": "Historia PolygonScan"
 }

res/values/strings_pt.arb

@@ -749,5 +749,6 @@
   "seed_language_czech": "Tcheco",
   "seed_language_korean": "coreano",
   "seed_language_chinese_traditional": "Chinês tradicional)",
+  "dfx_option_description": "Compre criptografia com EUR e CHF. Até 990€ sem KYC adicional. Para clientes de varejo e corporativos na Europa",
   "polygonscan_history": "História do PolygonScan"
 }

res/values/strings_ru.arb

@@ -750,5 +750,6 @@
   "seed_language_czech": "Чешский",
   "seed_language_korean": "Корейский",
   "seed_language_chinese_traditional": "Китайский традиционный)",
+  "dfx_option_description": "Покупайте криптовалюту за EUR и CHF. До 990€ без дополнительного KYC. Для розничных и корпоративных клиентов в Европе",
   "polygonscan_history": "История PolygonScan"
 }

res/values/strings_th.arb

@@ -748,5 +748,6 @@
   "seed_language_czech": "ภาษาเช็ก",
   "seed_language_korean": "เกาหลี",
   "seed_language_chinese_traditional": "จีน (ดั้งเดิม)",
+  "dfx_option_description": "ซื้อ crypto ด้วย EUR และ CHF สูงถึง 990€ โดยไม่มี KYC เพิ่มเติม สำหรับลูกค้ารายย่อยและลูกค้าองค์กรในยุโรป",
   "polygonscan_history": "ประวัติ PolygonScan"
 }

res/values/strings_tl.arb

@@ -744,5 +744,6 @@
   "seed_language_czech": "Czech",
   "seed_language_korean": "Korean",
   "seed_language_chinese_traditional": "Intsik (tradisyonal)",
+  "dfx_option_description": "Bumili ng crypto gamit ang EUR at CHF. Hanggang 990€ nang walang karagdagang KYC. Para sa retail at corporate na mga customer sa Europe",
   "polygonscan_history": "Kasaysayan ng PolygonScan"
 }

res/values/strings_tr.arb

@@ -748,5 +748,6 @@
   "seed_language_czech": "Çek",
   "seed_language_korean": "Koreli",
   "seed_language_chinese_traditional": "Çin geleneği)",
+  "dfx_option_description": "EUR ve CHF ile kripto satın alın. Ek KYC olmadan 990 €'ya kadar. Avrupa'daki perakende ve kurumsal müşteriler için",
   "polygonscan_history": "PolygonScan geçmişi"
 }

res/values/strings_uk.arb

@@ -749,6 +749,7 @@
   "seedtype_polyseed": "Полісей (16 слів)",
   "seed_language_czech": "Чеський",
   "seed_language_korean": "Корейський",
+  "dfx_option_description": "Купуйте криптовалюту за EUR і CHF. До 990 євро без додаткового KYC. Для роздрібних і корпоративних клієнтів у Європі",
   "seed_language_chinese_traditional": "Китайський (традиційний)",
   "polygonscan_history": "Історія PolygonScan"
 }

res/values/strings_ur.arb

@@ -742,5 +742,6 @@
   "seed_language_czech": "چیک",
   "seed_language_korean": "کورین",
   "seed_language_chinese_traditional": "چینی (روایتی)",
+  "dfx_option_description": "EUR ﺭﻭﺍ CHF ﯽﻓﺎﺿﺍ ۔ﮟﯾﺪﯾﺮﺧ ﻮﭩﭘﺮﮐ ﮫﺗﺎﺳ ﮯﮐ KYC ﮯﯿﻟ ﮯﮐ ﻦﯿﻓﺭﺎﺻ ﭧﯾﺭﻮﭘﺭﺎﮐ ﺭﻭﺍ ﮦﺩﺭﻮﺧ ﮟ",
   "polygonscan_history": "ﺦﯾﺭﺎﺗ ﯽﮐ ﻦﯿﮑﺳﺍ ﻥﻮﮔ ﯽﻟﻮﭘ"
 }

res/values/strings_yo.arb

@@ -744,5 +744,6 @@
   "seed_language_czech": "Czech",
   "seed_language_korean": "Ara ẹni",
   "seed_language_chinese_traditional": "Kannada (ibile)",
+  "dfx_option_description": "Ra crypto pẹlu EUR & CHF. Titi di 990 € laisi afikun KYC. Fun soobu ati awọn onibara ile-iṣẹ ni Yuroopu",
   "polygonscan_history": "PolygonScan itan"
 }

res/values/strings_zh.arb

@@ -749,5 +749,6 @@
   "seed_language_czech": "捷克",
   "seed_language_korean": "韩国人",
   "seed_language_chinese_traditional": "中国传统的）",
+  "dfx_option_description": "用欧元和瑞士法郎购买加密货币。高达 990 欧元，无需额外 KYC。对于欧洲的零售和企业客户",
   "polygonscan_history": "多边形扫描历史"
 }