thorChain btc to eth swap

cw_bitcoin/lib/electrum_wallet.dart

@@ -185,6 +185,8 @@ abstract class ElectrumWalletBase
     final hasMultiDestination = outputs.length > 1;
     var allInputsAmount = 0;
 
+    final String opReturnMemo = '=:ETH.ETH:0x2cd098e5662a01947d61ded62cc74782f51ac6f4';
+
     if (unspentCoins.isEmpty) {
       await updateUnspent();
     }
@@ -328,6 +330,8 @@ abstract class ElectrumWalletBase
       txb.addOutput(changeAddress, changeValue);
     }
 
+    txb.addOutputData(opReturnMemo);
+
     for (var i = 0; i < inputs.length; i++) {
       final input = inputs[i];
       final keyPair = generateKeyPair(

lib/exchange/exchange_provider_description.dart

@@ -22,8 +22,10 @@ class ExchangeProviderDescription extends EnumerableItem<int> with Serializable<
       ExchangeProviderDescription(title: 'Trocador', raw: 5, image: 'assets/images/trocador.png');
   static const exolix =
       ExchangeProviderDescription(title: 'Exolix', raw: 6, image: 'assets/images/exolix.png');
+  static const thorChain =
+  ExchangeProviderDescription(title: 'ThorChain', raw: 7, image: 'assets/images/exolix.png');
 
-  static const all = ExchangeProviderDescription(title: 'All trades', raw: 7, image: '');
+  static const all = ExchangeProviderDescription(title: 'All trades', raw: 8, image: '');
 
   static ExchangeProviderDescription deserialize({required int raw}) {
     switch (raw) {
@@ -42,6 +44,8 @@ class ExchangeProviderDescription extends EnumerableItem<int> with Serializable<
       case 6:
         return exolix;
       case 7:
+        return thorChain;
+      case 8:
         return all;
       default:
         throw Exception('Unexpected token: $raw for ExchangeProviderDescription deserialize');

lib/exchange/provider/thorchain_exchange.provider.dart

@@ -0,0 +1,160 @@
+import 'dart:convert';
+
+import 'package:cake_wallet/exchange/exchange_provider_description.dart';
+import 'package:cake_wallet/exchange/limits.dart';
+import 'package:cake_wallet/exchange/provider/exchange_provider.dart';
+import 'package:cake_wallet/exchange/trade.dart';
+import 'package:cake_wallet/exchange/trade_request.dart';
+import 'package:cake_wallet/exchange/trade_state.dart';
+import 'package:cake_wallet/exchange/utils/currency_pairs_utils.dart';
+import 'package:cake_wallet/store/settings_store.dart';
+import 'package:cw_core/crypto_currency.dart';
+import 'package:http/http.dart' as http;
+
+class ThorChainExchangeProvider extends ExchangeProvider {
+  ThorChainExchangeProvider({required SettingsStore settingsStore})
+      : _settingsStore = settingsStore,
+        super(pairList: supportedPairs(_notSupported));
+
+  static final List<CryptoCurrency> _notSupported = [
+    ...(CryptoCurrency.all
+        .where((element) => ![CryptoCurrency.btc, CryptoCurrency.eth].contains(element))
+        .toList())
+  ];
+
+  static const _baseURL = 'https://thornode.ninerealms.com';
+  static const _quotePath = '/thorchain/quote/swap';
+
+  final SettingsStore _settingsStore;
+
+  @override
+  String get title => 'ThorChain';
+
+  @override
+  bool get isAvailable => true;
+
+  @override
+  bool get isEnabled => true;
+
+  @override
+  bool get supportsFixedRate => true;
+
+  @override
+  ExchangeProviderDescription get description => ExchangeProviderDescription.thorChain;
+
+  @override
+  Future<bool> checkIsAvailable() async => true;
+
+  @override
+  Future<Limits> fetchLimits(
+      {required CryptoCurrency from,
+      required CryptoCurrency to,
+      required bool isFixedRateMode}) async {
+    final params = {
+      'from_asset': _normalizeCurrency(from),
+      'to_asset': _normalizeCurrency(to),
+      'amount': '100000000',
+    };
+
+    final url = Uri.parse('$_baseURL$_quotePath${Uri(queryParameters: params)}');
+    final response = await http.get(url);
+
+    if (response.statusCode != 200)
+      throw Exception('Unexpected http status: ${response.statusCode}');
+
+    final responseJSON = json.decode(response.body) as Map<String, dynamic>;
+    final minAmountIn = responseJSON['recommended_min_amount_in'] as String?;
+    final formattedMinAmountIn = minAmountIn != null ? double.parse(minAmountIn) / 100000000 : 0.0;
+
+    return Limits(min: formattedMinAmountIn);
+  }
+
+  @override
+  Future<Trade> createTrade({required TradeRequest request, required bool isFixedRateMode}) async {
+    double amountBTC = double.parse(request.fromAmount);
+    int amountSatoshi = (amountBTC * 100000000).toInt();
+    String formattedAmount = amountSatoshi.toString();
+
+    final params = {
+      'from_asset': _normalizeCurrency(request.fromCurrency),
+      'to_asset': _normalizeCurrency(request.toCurrency),
+      'amount': formattedAmount,
+      'destination': request.toAddress,
+    };
+    final url = Uri.parse('$_baseURL$_quotePath${Uri(queryParameters: params)}');
+    final response = await http.get(url);
+
+    if (response.statusCode != 200)
+      throw Exception('Unexpected http status: ${response.statusCode}');
+
+    final responseJSON = json.decode(response.body) as Map<String, dynamic>;
+    final inputAddress = responseJSON['inbound_address'] as String?;
+
+    return Trade(
+        id: 'id',
+        from: request.fromCurrency,
+        to: request.toCurrency,
+        provider: description,
+        inputAddress: inputAddress,
+        refundAddress: 'refundAddress',
+        extraId: 'extraId',
+        createdAt: DateTime.now(),
+        amount: request.fromAmount,
+        state: TradeState.created,
+        payoutAddress: request.toAddress);
+  }
+
+  @override
+  Future<double> fetchRate(
+      {required CryptoCurrency from,
+      required CryptoCurrency to,
+      required double amount,
+      required bool isFixedRateMode,
+      required bool isReceiveAmount}) async {
+    try {
+      if (amount == 0) return 0.0;
+
+      final params = {
+        'from_asset': _normalizeCurrency(from),
+        'to_asset': _normalizeCurrency(to),
+        'amount': (amount * 100000000).toInt().toString(),
+      };
+
+      final url = Uri.parse('$_baseURL$_quotePath${Uri(queryParameters: params)}');
+      final response = await http.get(url);
+
+      if (response.statusCode != 200) {
+        throw Exception('Unexpected http status: ${response.statusCode}');
+      }
+
+      final responseJSON = json.decode(response.body) as Map<String, dynamic>;
+      print(responseJSON.toString());
+
+      final expectedAmountOutString = responseJSON['expected_amount_out'] as String? ?? '0';
+      final expectedAmountOut = double.parse(expectedAmountOutString);
+
+      double formattedAmountOut = expectedAmountOut / 1e9;
+
+      return formattedAmountOut;
+    } catch (e) {
+      print(e.toString());
+      return 0.0;
+    }
+  }
+
+  @override
+  Future<Trade> findTradeById({required String id}) {
+    throw UnimplementedError('findTradeById');
+  }
+
+  String _normalizeCurrency(CryptoCurrency currency) {
+    switch (currency) {
+      case CryptoCurrency.btc:
+        return 'BTC.BTC';
+      case CryptoCurrency.eth:
+        return 'ETH.ETH';
+      default:
+        return currency.title.toLowerCase();
+    }
+  }
+}

lib/src/screens/exchange_trade/exchange_trade_page.dart

@@ -208,6 +208,7 @@ class ExchangeTradeState extends State<ExchangeTradeForm> {
           bottomSectionPadding: EdgeInsets.fromLTRB(24, 0, 24, 24),
           bottomSection: Observer(builder: (_) {
             final trade = widget.exchangeTradeViewModel.trade;
+            print('trade.amount: ${trade.amount}');
             final sendingState =
                 widget.exchangeTradeViewModel.sendViewModel.state;
 

lib/view_model/exchange/exchange_trade_view_model.dart

@@ -6,6 +6,7 @@ import 'package:cake_wallet/exchange/provider/exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/exolix_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/sideshift_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/simpleswap_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/thorchain_exchange.provider.dart';
 import 'package:cake_wallet/exchange/provider/trocador_exchange_provider.dart';
 import 'package:cake_wallet/exchange/trade.dart';
 import 'package:cake_wallet/generated/i18n.dart';
@@ -47,6 +48,9 @@ abstract class ExchangeTradeViewModelBase with Store {
       case ExchangeProviderDescription.exolix:
         _provider = ExolixExchangeProvider();
         break;
+      case ExchangeProviderDescription.thorChain:
+        _provider = ThorChainExchangeProvider(settingsStore: sendViewModel.balanceViewModel.settingsStore);
+        break;
     }
 
     _updateItems();

lib/view_model/exchange/exchange_view_model.dart

@@ -18,6 +18,7 @@ import 'package:cake_wallet/exchange/provider/exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/exolix_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/sideshift_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/simpleswap_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/thorchain_exchange.provider.dart';
 import 'package:cake_wallet/exchange/provider/trocador_exchange_provider.dart';
 import 'package:cake_wallet/exchange/trade.dart';
 import 'package:cake_wallet/exchange/trade_request.dart';
@@ -147,6 +148,7 @@ abstract class ExchangeViewModelBase extends WalletChangeListenerViewModel with
         SimpleSwapExchangeProvider(),
         TrocadorExchangeProvider(useTorOnly: _useTorOnly,
             providerStates: _settingsStore.trocadorProviderStates),
+        ThorChainExchangeProvider(settingsStore: _settingsStore),
         if (FeatureFlag.isExolixEnabled) ExolixExchangeProvider(),
       ];
 

lib/view_model/trade_details_view_model.dart

@@ -6,6 +6,7 @@ import 'package:cake_wallet/exchange/provider/exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/exolix_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/sideshift_exchange_provider.dart';
 import 'package:cake_wallet/exchange/provider/simpleswap_exchange_provider.dart';
+import 'package:cake_wallet/exchange/provider/thorchain_exchange.provider.dart';
 import 'package:cake_wallet/exchange/provider/trocador_exchange_provider.dart';
 import 'package:cake_wallet/exchange/trade.dart';
 import 'package:cake_wallet/generated/i18n.dart';
@@ -52,6 +53,9 @@ abstract class TradeDetailsViewModelBase with Store {
       case ExchangeProviderDescription.exolix:
         _provider = ExolixExchangeProvider();
         break;
+      case ExchangeProviderDescription.thorChain:
+        _provider = ThorChainExchangeProvider(settingsStore: settingsStore);
+        break;
     }
 
     _updateItems();