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Create mayachain_exchange.provider.dart
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GiMa-Maya
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285
lib/exchange/provider/mayachain_exchange.provider.dart
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285
lib/exchange/provider/mayachain_exchange.provider.dart
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import 'dart:convert';
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import 'package:cake_wallet/exchange/exchange_provider_description.dart';
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import 'package:cake_wallet/exchange/limits.dart';
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import 'package:cake_wallet/exchange/provider/exchange_provider.dart';
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import 'package:cake_wallet/exchange/trade.dart';
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import 'package:cake_wallet/exchange/trade_request.dart';
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import 'package:cake_wallet/exchange/trade_state.dart';
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import 'package:cake_wallet/exchange/utils/currency_pairs_utils.dart';
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import 'package:cw_core/crypto_currency.dart';
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import 'package:hive/hive.dart';
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import 'package:http/http.dart' as http;
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class MayaChainExchangeProvider extends ExchangeProvider {
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MayaChainExchangeProvider({required this.tradesStore})
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: super(pairList: supportedPairs(_notSupported));
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static final List<CryptoCurrency> _notSupported = [
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...(CryptoCurrency.all
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.where((element) => ![
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CryptoCurrency.btc,
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CryptoCurrency.eth,
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CryptoCurrency.usdc,
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CryptoCurrency.usdterc20,
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].contains(element))
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.toList())
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];
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static final isRefundAddressSupported = [CryptoCurrency.eth];
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static const _baseNodeURL = 'https://mayanode.mayachain.info';
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static const _baseURL = 'https://midgard.mayachain.infp';
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static const _quotePath = '/mayachain/quote/swap';
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static const _txInfoPath = '/mayachain/tx/status/';
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static const _affiliateName = 'cakewallet'; // register a shorter one
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static const _affiliateBps = '175';
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static const _nameLookUpPath = 'v2/mayaname/lookup/';
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final Box<Trade> tradesStore;
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@override
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String get title => 'MAYAChain';
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@override
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bool get isAvailable => true;
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@override
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bool get isEnabled => true;
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@override
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bool get supportsFixedRate => false;
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@override
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ExchangeProviderDescription get description => ExchangeProviderDescription.mayaChain;
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@override
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Future<bool> checkIsAvailable() async => true;
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@override
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Future<double> fetchRate(
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{required CryptoCurrency from,
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required CryptoCurrency to,
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required double amount,
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required bool isFixedRateMode,
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required bool isReceiveAmount}) async {
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try {
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if (amount == 0) return 0.0;
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final params = {
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'from_asset': _normalizeCurrency(from),
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'to_asset': _normalizeCurrency(to),
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'amount': _doubleToMayaChainString(amount),
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'affiliate': _affiliateName,
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'affiliate_bps': _affiliateBps
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};
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final responseJSON = await _getSwapQuote(params);
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final expectedAmountOut = responseJSON['expected_amount_out'] as String? ?? '0.0';
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return _mayaChainAmountToDouble(expectedAmountOut) / amount;
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} catch (e) {
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print(e.toString());
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return 0.0;
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}
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}
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@override
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Future<Limits> fetchLimits(
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{required CryptoCurrency from,
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required CryptoCurrency to,
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required bool isFixedRateMode}) async {
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final params = {
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'from_asset': _normalizeCurrency(from),
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'to_asset': _normalizeCurrency(to),
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'amount': _doubleToMayaChainString(1),
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'affiliate': _affiliateName,
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'affiliate_bps': _affiliateBps
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};
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final responseJSON = await _getSwapQuote(params);
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final minAmountIn = responseJSON['recommended_min_amount_in'] as String? ?? '0.0';
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return Limits(min: _mayaChainAmountToDouble(minAmountIn));
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}
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@override
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Future<Trade> createTrade({
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required TradeRequest request,
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required bool isFixedRateMode,
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required bool isSendAll,
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}) async {
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String formattedToAddress = request.toAddress.startsWith('bitcoincash:')
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? request.toAddress.replaceFirst('bitcoincash:', '')
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: request.toAddress;
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final formattedFromAmount = double.parse(request.fromAmount);
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final params = {
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'from_asset': _normalizeCurrency(request.fromCurrency),
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'to_asset': _normalizeCurrency(request.toCurrency),
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'amount': _doubleToMayaChainString(formattedFromAmount),
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'destination': formattedToAddress,
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'affiliate': _affiliateName,
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'affiliate_bps': _affiliateBps,
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'refund_address':
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isRefundAddressSupported.contains(request.fromCurrency) ? request.refundAddress : '',
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};
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final responseJSON = await _getSwapQuote(params);
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final inputAddress = responseJSON['inbound_address'] as String?;
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final memo = responseJSON['memo'] as String?;
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final directAmountOutResponse = responseJSON['expected_amount_out'] as String?;
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String? receiveAmount;
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if (directAmountOutResponse != null) {
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receiveAmount = _mayaChainAmountToDouble(directAmountOutResponse).toString();
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}
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return Trade(
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id: '',
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from: request.fromCurrency,
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to: request.toCurrency,
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provider: description,
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inputAddress: inputAddress,
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createdAt: DateTime.now(),
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amount: request.fromAmount,
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receiveAmount: receiveAmount ?? request.toAmount,
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state: TradeState.notFound,
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payoutAddress: request.toAddress,
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memo: memo,
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isSendAll: isSendAll,
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);
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}
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@override
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Future<Trade> findTradeById({required String id}) async {
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if (id.isEmpty) throw Exception('Trade id is empty');
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final formattedId = id.startsWith('0x') ? id.substring(2) : id;
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final uri = Uri.https(_baseNodeURL, '$_txInfoPath$formattedId');
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final response = await http.get(uri);
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if (response.statusCode == 404) {
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throw Exception('Trade not found for id: $formattedId');
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} else if (response.statusCode != 200) {
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throw Exception('Unexpected HTTP status: ${response.statusCode}');
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}
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final responseJSON = json.decode(response.body);
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final Map<String, dynamic> stagesJson = responseJSON['stages'] as Map<String, dynamic>;
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final inboundObservedStarted = stagesJson['inbound_observed']?['started'] as bool? ?? true;
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if (!inboundObservedStarted) {
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throw Exception('Trade has not started for id: $formattedId');
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}
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final currentState = _updateStateBasedOnStages(stagesJson) ?? TradeState.notFound;
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final tx = responseJSON['tx'];
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final String fromAddress = tx['from_address'] as String? ?? '';
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final String toAddress = tx['to_address'] as String? ?? '';
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final List<dynamic> coins = tx['coins'] as List<dynamic>;
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final String? memo = tx['memo'] as String?;
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final parts = memo?.split(':') ?? [];
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final String toChain = parts.length > 1 ? parts[1].split('.')[0] : '';
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final String toAsset = parts.length > 1 && parts[1].split('.').length > 1
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? parts[1].split('.')[1].split('-')[0]
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: '';
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final formattedToChain = CryptoCurrency.fromString(toChain);
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final toAssetWithChain = CryptoCurrency.fromString(toAsset, walletCurrency: formattedToChain);
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final plannedOutTxs = responseJSON['planned_out_txs'] as List<dynamic>?;
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final isRefund = plannedOutTxs?.any((tx) => tx['refund'] == true) ?? false;
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return Trade(
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id: id,
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from: CryptoCurrency.fromString(tx['chain'] as String? ?? ''),
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to: toAssetWithChain,
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provider: description,
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inputAddress: fromAddress,
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payoutAddress: toAddress,
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amount: coins.first['amount'] as String? ?? '0.0',
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state: currentState,
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memo: memo,
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isRefund: isRefund,
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);
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}
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static Future<Map<String, String>?>? lookupAddressByName(String name) async {
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final uri = Uri.https(_baseURL, '$_nameLookUpPath$name');
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final response = await http.get(uri);
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if (response.statusCode != 200) {
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return null;
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}
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final body = json.decode(response.body) as Map<String, dynamic>;
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final entries = body['entries'] as List<dynamic>?;
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if (entries == null || entries.isEmpty) {
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return null;
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}
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Map<String, String> chainToAddressMap = {};
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for (final entry in entries) {
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final chain = entry['chain'] as String;
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final address = entry['address'] as String;
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chainToAddressMap[chain] = address;
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}
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return chainToAddressMap;
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}
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Future<Map<String, dynamic>> _getSwapQuote(Map<String, String> params) async {
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Uri uri = Uri.https(_baseNodeURL, _quotePath, params);
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final response = await http.get(uri);
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if (response.statusCode != 200) {
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throw Exception('Unexpected HTTP status: ${response.statusCode}');
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}
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if (response.body.contains('error')) {
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throw Exception('Unexpected response: ${response.body}');
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}
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return json.decode(response.body) as Map<String, dynamic>;
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}
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String _normalizeCurrency(CryptoCurrency currency) {
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final networkTitle = currency.tag == 'ETH' ? 'ETH' : currency.title;
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return '$networkTitle.${currency.title}';
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}
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String _doubleTomayaChainString(double amount) => (amount * 1e8).toInt().toString();
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double _mayaChainAmountToDouble(String amount) => double.parse(amount) / 1e8;
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TradeState? _updateStateBasedOnStages(Map<String, dynamic> stages) {
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TradeState? currentState;
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if (stages['inbound_observed']['completed'] as bool? ?? false) {
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currentState = TradeState.confirmation;
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}
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if (stages['inbound_confirmation_counted']['completed'] as bool? ?? false) {
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currentState = TradeState.confirmed;
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}
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if (stages['inbound_finalised']['completed'] as bool? ?? false) {
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currentState = TradeState.processing;
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}
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if (stages['swap_finalised']['completed'] as bool? ?? false) {
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currentState = TradeState.traded;
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}
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if (stages['outbound_signed']['completed'] as bool? ?? false) {
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currentState = TradeState.success;
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}
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return currentState;
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}
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}
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