cake-tech · CumpsD · Nov 15, 2024
diff --git a/assets/images/chainflip.png b/assets/images/chainflip.png
diff --git a/assets/images/flip_icon.png b/assets/images/flip_icon.png
diff --git a/cw_core/lib/crypto_currency.dart b/cw_core/lib/crypto_currency.dart
@@ -107,6 +107,7 @@ class CryptoCurrency extends EnumerableItem<int> with Serializable<int> implemen
     CryptoCurrency.tbtc,
     CryptoCurrency.wow,
     CryptoCurrency.ton,
+    CryptoCurrency.flip
   ];
 
   static const havenCurrencies = [
@@ -226,6 +227,7 @@ class CryptoCurrency extends EnumerableItem<int> with Serializable<int> implemen
   static const wow = CryptoCurrency(title: 'WOW', fullName: 'Wownero', raw: 94, name: 'wow', iconPath: 'assets/images/wownero_icon.png', decimals: 11);
   static const ton = CryptoCurrency(title: 'TON', fullName: 'Toncoin', raw: 95, name: 'ton', iconPath: 'assets/images/ton_icon.png', decimals: 8);
 
+  static const flip = CryptoCurrency(title: 'FLIP', tag: 'ETH', fullName: 'Chainflip', raw: 96, name: 'flip', iconPath: 'assets/images/flip_icon.png', decimals: 18);
 
   static final Map<int, CryptoCurrency> _rawCurrencyMap =
     [...all, ...havenCurrencies].fold<Map<int, CryptoCurrency>>(<int, CryptoCurrency>{}, (acc, item) {

diff --git a/cw_ethereum/lib/default_ethereum_erc20_tokens.dart b/cw_ethereum/lib/default_ethereum_erc20_tokens.dart
@@ -290,6 +290,13 @@ class DefaultEthereumErc20Tokens {
       decimal: 6,
       enabled: false,
     ),
+    Erc20Token(
+      name: "Chainflip",
+      symbol: "FLIP",
+      contractAddress: "0x826180541412D574cf1336d22c0C0a287822678A",
+      decimal: 18,
+      enabled: false,
+    ),
   ];
 
   List<Erc20Token> get initialErc20Tokens => _defaultTokens.map((token) {

diff --git a/lib/exchange/exchange_provider_description.dart b/lib/exchange/exchange_provider_description.dart
@@ -16,22 +16,25 @@ class ExchangeProviderDescription extends EnumerableItem<int> with Serializable<
       ExchangeProviderDescription(title: 'MorphToken', raw: 2, image: 'assets/images/morph.png');
   static const sideShift =
       ExchangeProviderDescription(title: 'SideShift', raw: 3, image: 'assets/images/sideshift.png');
-  static const simpleSwap = ExchangeProviderDescription(
-      title: 'SimpleSwap', raw: 4, image: 'assets/images/simpleSwap.png');
+  static const simpleSwap = 
+      ExchangeProviderDescription(title: 'SimpleSwap', raw: 4, image: 'assets/images/simpleSwap.png');
   static const trocador =
       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 all = ExchangeProviderDescription(title: 'All trades', raw: 7, image: '');
+  static const all = 
+      ExchangeProviderDescription(title: 'All trades', raw: 7, image: '');
   static const thorChain =
       ExchangeProviderDescription(title: 'ThorChain', raw: 8, image: 'assets/images/thorchain.png');
   static const quantex =
       ExchangeProviderDescription(title: 'Quantex', raw: 9, image: 'assets/images/quantex.png');
   static const letsExchange =
-  ExchangeProviderDescription(title: 'LetsExchange', raw: 10, image: 'assets/images/letsexchange_icon.svg');
+      ExchangeProviderDescription(title: 'LetsExchange', raw: 10, image: 'assets/images/letsexchange_icon.svg');
   static const stealthEx =
-  ExchangeProviderDescription(title: 'StealthEx', raw: 11, image: 'assets/images/stealthex.png');
-
+      ExchangeProviderDescription(title: 'StealthEx', raw: 11, image: 'assets/images/stealthex.png');
+  static const chainflip =
+      ExchangeProviderDescription(title: 'Chainflip', raw: 12, image: 'assets/images/chainflip.png');
+
   static ExchangeProviderDescription deserialize({required int raw}) {
     switch (raw) {
       case 0:
@@ -58,6 +61,8 @@ class ExchangeProviderDescription extends EnumerableItem<int> with Serializable<
         return letsExchange;
       case 11:
         return stealthEx;
+      case 12:
+        return chainflip;
       default:
         throw Exception('Unexpected token: $raw for ExchangeProviderDescription deserialize');
     }

diff --git a/lib/exchange/provider/chainflip_exchange_provider.dart b/lib/exchange/provider/chainflip_exchange_provider.dart
@@ -0,0 +1,313 @@
+import 'dart:convert';
+import 'dart:math';
+
+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:cw_core/crypto_currency.dart';
+import 'package:hive/hive.dart';
+import 'package:http/http.dart' as http;
+
+class ChainflipExchangeProvider extends ExchangeProvider {
+  ChainflipExchangeProvider({required this.tradesStore})
+      : super(pairList: supportedPairs(_notSupported));
+
+  static final List<CryptoCurrency> _notSupported = [
+    ...(CryptoCurrency.all
+        .where((element) => ![
+              CryptoCurrency.btc,
+              CryptoCurrency.eth,
+              CryptoCurrency.usdc,
+              CryptoCurrency.usdterc20,
+              CryptoCurrency.flip,
+              CryptoCurrency.sol,
+              CryptoCurrency.usdcsol,
+              // TODO: Add CryptoCurrency.etharb
+              // TODO: Add CryptoCurrency.usdcarb
+              // TODO: Add CryptoCurrency.dot
+            ].contains(element))
+        .toList())
+  ];
+
+  static const _baseURL = 'chainflip-broker.io';
+  static const _assetsPath = '/assets';
+  static const _quotePath = '/quote-native';
+  static const _swapPath = '/swap';
+  static const _txInfoPath = '/status-by-deposit-channel';
+  static const _affiliateBps = '170';
+  static const _affiliateKey = '6ba154d4-e219-472a-9674-5fa5b1300ccf';
+  // TODO: Example key, replace with CW key
+
+  final Box<Trade> tradesStore;
+
+  @override
+  String get title => 'Chainflip';
+
+  @override
+  bool get isAvailable => true;
+
+  @override
+  bool get isEnabled => true;
+
+  @override
+  bool get supportsFixedRate => false;
+
+  @override
+  ExchangeProviderDescription get description =>
+      ExchangeProviderDescription.chainflip;
+
+  @override
+  Future<bool> checkIsAvailable() async => true;
+
+  @override
+  Future<Limits> fetchLimits(
+      {required CryptoCurrency from,
+      required CryptoCurrency to,
+      required bool isFixedRateMode}) async {
+    final assetId = _normalizeCurrency(from);
+
+    final assetsResponse = await _getAssets();
+    final assets = assetsResponse['assets'] as List<dynamic>;
+
+    final minAmount = assets.firstWhere(
+            (asset) => asset['id'] == assetId,
+            orElse: () => null)?['minimalAmountNative'] ?? '0';
+
+    return Limits(min: _amountFromNative(minAmount.toString(), from));
+  }
+
+  @override
+  Future<double> fetchRate(
+      {required CryptoCurrency from,
+      required CryptoCurrency to,
+      required double amount,
+      required bool isFixedRateMode,
+      required bool isReceiveAmount}) async {
+    // TODO: It seems this rate is getting cached, and re-used for different amounts, can we not do this?
+
+    try {
+      if (amount == 0) return 0.0;
+
+      final quoteParams = {
+        'apiKey': _affiliateKey,
+        'sourceAsset': _normalizeCurrency(from),
+        'destinationAsset': _normalizeCurrency(to),
+        'amount': _amountToNative(amount, from),
+        'commissionBps': _affiliateBps
+      };
+
+      final quoteResponse = await _getSwapQuote(quoteParams);
+
+      final expectedAmountOut =
+          quoteResponse['egressAmountNative'] as String? ?? '0';
+
+      return _amountFromNative(expectedAmountOut, to) / amount;
+    } catch (e) {
+      print(e.toString());
+      return 0.0;
+    }
+  }
+
+  @override
+  Future<Trade> createTrade(
+      {required TradeRequest request,
+      required bool isFixedRateMode,
+      required bool isSendAll}) async {
+    try {
+      final maxSlippage = 2;
+
+      final quoteParams = {
+        'apiKey': _affiliateKey,
+        'sourceAsset': _normalizeCurrency(request.fromCurrency),
+        'destinationAsset': _normalizeCurrency(request.toCurrency),
+        'amount': _amountToNative(double.parse(request.fromAmount), request.fromCurrency),
+        'commissionBps': _affiliateBps
+      };
+
+      final quoteResponse = await _getSwapQuote(quoteParams);
+      final estimatedPrice = quoteResponse['estimatedPrice'] as double;
+      final minimumPrice = estimatedPrice * (100 - maxSlippage) / 100;
+
+      final swapParams = {
+        'apiKey': _affiliateKey,
+        'sourceAsset': _normalizeCurrency(request.fromCurrency),
+        'destinationAsset': _normalizeCurrency(request.toCurrency),
+        'destinationAddress': request.toAddress,
+        'commissionBps': _affiliateBps,
+        'minimumPrice': minimumPrice.toString(),
+        'refundAddress': request.refundAddress,
+        'retryDurationInBlocks': '10'
+      };
+
+      final swapResponse = await _openDepositChannel(swapParams);
+
+      final id = '${swapResponse['issuedBlock']}-${swapResponse['network'].toString().toUpperCase()}-${swapResponse['channelId']}';
+
+      return Trade(
+          id: id,
+          from: request.fromCurrency,
+          to: request.toCurrency,
+          provider: description,
+          inputAddress: swapResponse['address'].toString(),
+          createdAt: DateTime.now(),
+          amount: request.fromAmount,
+          receiveAmount: request.toAmount,
+          state: TradeState.waiting,
+          payoutAddress: request.toAddress,
+          isSendAll: isSendAll);
+    } catch (e) {
+      print(e.toString());
+      rethrow;
+    }
+  }
+
+  @override
+  Future<Trade> findTradeById({required String id}) async {
+    try {
+      final channelParts = id.split('-');
+
+      final statusParams = {
+        'apiKey': _affiliateKey,
+        'issuedBlock': channelParts[0],
+        'network': channelParts[1],
+        'channelId': channelParts[2]
+      };
+
+      final statusResponse = await _getStatus(statusParams);
+
+      if (statusResponse == null)
+        throw Exception('Trade not found for id: $id');
+
+      final status = statusResponse['status'];
+      final currentState = _determineState(status['state'].toString());
+
+      final depositAmount = status['deposit']?['amount']?.toString() ?? '0.0';
+      final receiveAmount = status['swapEgress']?['amount']?.toString() ?? '0.0';
+      final refundAmount = status['refundEgress']?['amount']?.toString() ?? '0.0';
+      final isRefund = status['refundEgress'] != null;
+      final amount = isRefund ? refundAmount : receiveAmount;
+
+      final newTrade = Trade(
+          id: id,
+          from: _toCurrency(status['sourceAsset'].toString()),
+          to: _toCurrency(status['destinationAsset'].toString()),
+          provider: description,
+          amount: depositAmount,
+          receiveAmount: amount,
+          state: currentState,
+          payoutAddress: status['destinationAddress'].toString(),
+          outputTransaction: status['swapEgress']?['transactionReference']?.toString(),
+          isRefund: isRefund);
+
+      // Find trade and update receiveAmount with the real value received
+      final storedTrade = _getStoredTrade(id);
+
+      if (storedTrade != null) {
+        storedTrade.$2.receiveAmount = newTrade.receiveAmount;
+        storedTrade.$2.outputTransaction = newTrade.outputTransaction;
+        tradesStore.put(storedTrade.$1, storedTrade.$2);
+      }
+
+      return newTrade;
+    } catch (e) {
+      print(e.toString());
+      rethrow;
+    }
+  }
+
+  String _normalizeCurrency(CryptoCurrency currency) {
+    final network = switch (currency.tag) {
+      'ETH' => 'eth',
+      'SOL' => 'sol',
+      _ => currency.title.toLowerCase()
+    };
+
+    return '${currency.title.toLowerCase()}.$network';
+  }
+
+  CryptoCurrency? _toCurrency(String name) {
+    final currency = switch (name) {
+      'btc.btc' => CryptoCurrency.btc,
+      'eth.eth' => CryptoCurrency.eth,
+      'usdc.eth' => CryptoCurrency.usdc,
+      'usdt.eth' => CryptoCurrency.usdterc20,
+      'flip.eth' => CryptoCurrency.flip,
+      'sol.sol' => CryptoCurrency.sol,
+      'usdc.sol' => CryptoCurrency.usdcsol,
+      _ => null
+    };
+
+    return currency;
+  }
+
+  (dynamic, Trade)? _getStoredTrade(String id) {
+    for (var i = tradesStore.length -1; i >= 0; i--) {
+      Trade? t = tradesStore.getAt(i);
+
+      if (t != null && t.id == id)
+        return (i, t);
+    }
+
+    return null;
+  }
+
+  String _amountToNative(double amount, CryptoCurrency currency) =>
+      (amount * pow(10, currency.decimals)).toInt().toString();
+
+  double _amountFromNative(String amount, CryptoCurrency currency) =>
+      double.parse(amount) / pow(10, currency.decimals);
+
+  Future<Map<String, dynamic>> _getAssets() async =>
+      _getRequest(_assetsPath, {});
+
+  Future<Map<String, dynamic>> _getSwapQuote(Map<String, String> params) async =>
+      _getRequest(_quotePath, params);
+
+  Future<Map<String, dynamic>> _openDepositChannel(Map<String, String> params) async =>
+      _getRequest(_swapPath, params);
+
+  Future<Map<String, dynamic>> _getRequest(String path, Map<String, String> params) async {
+    final uri = Uri.https(_baseURL, path, params);
+
+    final response = await http.get(uri);
+
+    if ((response.statusCode != 200) || (response.body.contains('error'))) {
+      throw Exception('Unexpected response: ${response.statusCode} / ${uri.toString()} / ${response.body}');
+    }
+
+    return json.decode(response.body) as Map<String, dynamic>;
+  }
+
+  Future<Map<String, dynamic>?> _getStatus(Map<String, String> params) async {
+    final uri = Uri.https(_baseURL, _txInfoPath, params);
+
+    final response = await http.get(uri);
+
+    if (response.statusCode == 404) return null;
+
+    if ((response.statusCode != 200) || (response.body.contains('error'))) {
+      throw Exception('Unexpected response: ${response.statusCode} / ${uri.toString()} / ${response.body}');
+    }
+
+    return json.decode(response.body) as Map<String, dynamic>;
+  }
+
+  TradeState _determineState(String state) {
+    final swapState = switch (state) {
+      'waiting' => TradeState.waiting,
+      'receiving' => TradeState.processing,
+      'swapping' => TradeState.processing,
+      'sending' => TradeState.processing,
+      'sent' => TradeState.processing,
+      'completed' => TradeState.success,
+      'failed' => TradeState.failed,
+      _ => TradeState.notFound
+    };
+
+    return swapState;
+  }
+}
diff --git a/lib/exchange/provider/exolix_exchange_provider.dart b/lib/exchange/provider/exolix_exchange_provider.dart
@@ -184,7 +184,7 @@ class ExolixExchangeProvider extends ExchangeProvider {
       extraId: extraId,
       createdAt: DateTime.now(),
       amount: amount,
-      receiveAmount:receiveAmount ?? request.toAmount,
+      receiveAmount: receiveAmount ?? request.toAmount,
       state: TradeState.created,
       payoutAddress: payoutAddress,
       isSendAll: isSendAll,