| 1 | import 'dart:convert'; |
| 2 | |
| 3 | import 'package:cake_wallet/.secrets.g.dart' as secrets; |
| 4 | import 'package:cake_wallet/exchange/provider/exchange_provider.dart'; |
| 5 | import 'package:cake_wallet/exchange/exchange_provider_description.dart'; |
| 6 | import 'package:cake_wallet/exchange/limits.dart'; |
| 7 | import 'package:cake_wallet/exchange/trade.dart'; |
| 8 | import 'package:cake_wallet/exchange/trade_not_created_exception.dart'; |
| 9 | import 'package:cake_wallet/exchange/trade_not_found_exception.dart'; |
| 10 | import 'package:cake_wallet/exchange/trade_request.dart'; |
| 11 | import 'package:cake_wallet/exchange/trade_state.dart'; |
| 12 | import 'package:cake_wallet/utils/device_info.dart'; |
| 13 | import 'package:cw_core/utils/proxy_wrapper.dart'; |
| 14 | import 'package:cw_core/crypto_currency.dart'; |
| 15 | import 'package:cake_wallet/utils/exchange_provider_logger.dart'; |
| 16 | |
| 17 | class SimpleSwapExchangeProvider extends ExchangeProvider { |
| 18 | SimpleSwapExchangeProvider(); |
| 19 | |
| 20 | static final apiKey = |
| 21 | DeviceInfo.instance.isMobile ? secrets.simpleSwapApiKey : secrets.simpleSwapApiKeyDesktop; |
| 22 | static const apiAuthority = 'api.simpleswap.io'; |
| 23 | static const getEstimatePath = '/v1/get_estimated'; |
| 24 | static const rangePath = '/v1/get_ranges'; |
| 25 | static const getExchangePath = '/v1/get_exchange'; |
| 26 | static const createExchangePath = '/v1/create_exchange'; |
| 27 | |
| 28 | @override |
| 29 | String get title => 'SimpleSwap'; |
| 30 | |
| 31 | @override |
| 32 | bool get isAvailable => false; |
| 33 | |
| 34 | @override |
| 35 | bool get isEnabled => false; |
| 36 | |
| 37 | @override |
| 38 | bool get supportsFixedRate => false; |
| 39 | |
| 40 | @override |
| 41 | ExchangeProviderDescription get description => ExchangeProviderDescription.simpleSwap; |
| 42 | |
| 43 | @override |
| 44 | Future<bool> checkIsAvailable() async { |
| 45 | final uri = Uri.https(apiAuthority, getEstimatePath, <String, String>{'api_key': apiKey}); |
| 46 | final response = await ProxyWrapper().get(clearnetUri: uri); |
| 47 | |
| 48 | return !(response.statusCode == 403); |
| 49 | } |
| 50 | |
| 51 | @override |
| 52 | Future<Limits?> fetchLimits( |
| 53 | {required CryptoCurrency from, |
| 54 | required CryptoCurrency to, |
| 55 | required bool isFixedRateMode}) async { |
| 56 | final params = <String, dynamic>{ |
| 57 | 'api_key': apiKey, |
| 58 | 'fixed': isFixedRateMode.toString(), |
| 59 | 'currency_from': _normalizeCurrency(from), |
| 60 | 'currency_to': _normalizeCurrency(to), |
| 61 | }; |
| 62 | final uri = Uri.https(apiAuthority, rangePath, params); |
| 63 | |
| 64 | final response = await ProxyWrapper().get(clearnetUri: uri); |
| 65 | |
| 66 | if (response.statusCode == 500) { |
| 67 | final responseJSON = json.decode(response.body) as Map<String, dynamic>; |
| 68 | final error = responseJSON['message'] as String; |
| 69 | |
| 70 | throw Exception('$error'); |
| 71 | } |
| 72 | |
| 73 | if (response.statusCode != 200) { |
| 74 | throw Exception('Unexpected http status: ${response.statusCode}'); |
| 75 | } |
| 76 | |
| 77 | final responseJSON = json.decode(response.body) as Map<String, dynamic>; |
| 78 | final min = double.tryParse(responseJSON['min'] as String? ?? ''); |
| 79 | final max = double.tryParse(responseJSON['max'] as String? ?? ''); |
| 80 | |
| 81 | return Limits(min: min, max: max); |
| 82 | } |
| 83 | |
| 84 | @override |
| 85 | Future<double> fetchRate( |
| 86 | {required CryptoCurrency from, |
| 87 | required CryptoCurrency to, |
| 88 | required double amount, |
| 89 | required bool isFixedRateMode, |
| 90 | required bool isReceiveAmount}) async { |
| 91 | try { |
| 92 | if (amount == 0) return 0.0; |
| 93 | |
| 94 | final params = { |
| 95 | 'api_key': apiKey, |
| 96 | 'currency_from': _normalizeCurrency(from), |
| 97 | 'currency_to': _normalizeCurrency(to), |
| 98 | 'amount': amount.toString(), |
| 99 | 'fixed': isFixedRateMode.toString() |
| 100 | }; |
| 101 | final uri = Uri.https(apiAuthority, getEstimatePath, params); |
| 102 | final response = await ProxyWrapper().get(clearnetUri: uri); |
| 103 | |
| 104 | if (response.body == "null") { |
| 105 | ExchangeProviderLogger.logError( |
| 106 | provider: description, |
| 107 | function: 'fetchRate', |
| 108 | error: Exception('Null response body'), |
| 109 | stackTrace: StackTrace.current, |
| 110 | requestData: { |
| 111 | 'from': from.title, |
| 112 | 'to': to.title, |
| 113 | 'amount': amount, |
| 114 | 'isFixedRateMode': isFixedRateMode, |
| 115 | 'isReceiveAmount': isReceiveAmount, |
| 116 | 'params': params, |
| 117 | 'url': uri.toString(), |
| 118 | }, |
| 119 | ); |
| 120 | return 0.00; |
| 121 | } |
| 122 | |
| 123 | final data = json.decode(response.body) as String; |
| 124 | final rate = double.parse(data) / amount; |
| 125 | |
| 126 | ExchangeProviderLogger.logSuccess( |
| 127 | provider: description, |
| 128 | function: 'fetchRate', |
| 129 | requestData: { |
| 130 | 'from': from.title, |
| 131 | 'to': to.title, |
| 132 | 'amount': amount, |
| 133 | 'isFixedRateMode': isFixedRateMode, |
| 134 | 'isReceiveAmount': isReceiveAmount, |
| 135 | 'params': params, |
| 136 | 'url': uri.toString(), |
| 137 | }, |
| 138 | responseData: { |
| 139 | 'data': data, |
| 140 | 'rate': rate, |
| 141 | 'statusCode': response.statusCode, |
| 142 | 'responseBody': response.body, |
| 143 | }, |
| 144 | ); |
| 145 | |
| 146 | return rate; |
| 147 | } catch (e, s) { |
| 148 | ExchangeProviderLogger.logError( |
| 149 | provider: description, |
| 150 | function: 'fetchRate', |
| 151 | error: e, |
| 152 | stackTrace: s, |
| 153 | requestData: { |
| 154 | 'from': from.title, |
| 155 | 'to': to.title, |
| 156 | 'amount': amount, |
| 157 | 'isFixedRateMode': isFixedRateMode, |
| 158 | 'isReceiveAmount': isReceiveAmount, |
| 159 | }, |
| 160 | ); |
| 161 | return 0.00; |
| 162 | } |
| 163 | } |
| 164 | |
| 165 | @override |
| 166 | Future<Trade> createTrade({ |
| 167 | required TradeRequest request, |
| 168 | required bool isFixedRateMode, |
| 169 | required bool isSendAll, |
| 170 | }) async { |
| 171 | final headers = {'Content-Type': 'application/json'}; |
| 172 | final params = {'api_key': apiKey}; |
| 173 | final body = <String, dynamic>{ |
| 174 | "currency_from": _normalizeCurrency(request.fromCurrency), |
| 175 | "currency_to": _normalizeCurrency(request.toCurrency), |
| 176 | "amount": request.fromAmount, |
| 177 | "fixed": isFixedRateMode, |
| 178 | "user_refund_address": _normalizeAddress(request.refundAddress), |
| 179 | "address_to": _normalizeAddress(request.toAddress), |
| 180 | if (request.toAddressExtraId.isNotEmpty) "extra_id_to": request.toAddressExtraId, |
| 181 | }; |
| 182 | final uri = Uri.https(apiAuthority, createExchangePath, params); |
| 183 | |
| 184 | final response = await ProxyWrapper().post( |
| 185 | clearnetUri: uri, |
| 186 | headers: headers, |
| 187 | body: json.encode(body), |
| 188 | ); |
| 189 | |
| 190 | if (response.statusCode != 200 && response.statusCode != 201) { |
| 191 | if (response.statusCode == 400) { |
| 192 | final responseJSON = json.decode(response.body) as Map<String, dynamic>; |
| 193 | final error = responseJSON['message'] as String; |
| 194 | |
| 195 | ExchangeProviderLogger.logError( |
| 196 | provider: description, |
| 197 | function: 'createTrade', |
| 198 | error: TradeNotCreatedException(description, description: error), |
| 199 | stackTrace: StackTrace.current, |
| 200 | requestData: { |
| 201 | 'from': request.fromCurrency.title, |
| 202 | 'to': request.toCurrency.title, |
| 203 | 'fromAmount': request.fromAmount, |
| 204 | 'toAmount': request.toAmount, |
| 205 | 'toAddress': request.toAddress, |
| 206 | 'refundAddress': request.refundAddress, |
| 207 | 'isFixedRateMode': isFixedRateMode, |
| 208 | 'isSendAll': isSendAll, |
| 209 | 'body': body, |
| 210 | 'url': uri.toString(), |
| 211 | }, |
| 212 | ); |
| 213 | |
| 214 | throw TradeNotCreatedException(description, description: error); |
| 215 | } |
| 216 | |
| 217 | ExchangeProviderLogger.logError( |
| 218 | provider: description, |
| 219 | function: 'createTrade', |
| 220 | error: TradeNotCreatedException(description), |
| 221 | stackTrace: StackTrace.current, |
| 222 | requestData: { |
| 223 | 'from': request.fromCurrency.title, |
| 224 | 'to': request.toCurrency.title, |
| 225 | 'fromAmount': request.fromAmount, |
| 226 | 'toAmount': request.toAmount, |
| 227 | 'toAddress': request.toAddress, |
| 228 | 'refundAddress': request.refundAddress, |
| 229 | 'isFixedRateMode': isFixedRateMode, |
| 230 | 'isSendAll': isSendAll, |
| 231 | 'body': body, |
| 232 | 'url': uri.toString(), |
| 233 | }, |
| 234 | ); |
| 235 | |
| 236 | throw TradeNotCreatedException(description); |
| 237 | } |
| 238 | |
| 239 | final responseJSON = json.decode(response.body) as Map<String, dynamic>; |
| 240 | final id = responseJSON['id'] as String; |
| 241 | final inputAddress = responseJSON['address_from'] as String; |
| 242 | final payoutAddress = responseJSON['address_to'] as String; |
| 243 | final settleAddress = responseJSON['user_refund_address'] as String; |
| 244 | final extraId = responseJSON['extra_id_from'] as String?; |
| 245 | final receiveAmount = responseJSON['amount_to'] as String?; |
| 246 | |
| 247 | ExchangeProviderLogger.logSuccess( |
| 248 | provider: description, |
| 249 | function: 'createTrade', |
| 250 | requestData: { |
| 251 | 'from': request.fromCurrency.title, |
| 252 | 'to': request.toCurrency.title, |
| 253 | 'fromAmount': request.fromAmount, |
| 254 | 'toAmount': request.toAmount, |
| 255 | 'toAddress': request.toAddress, |
| 256 | 'refundAddress': request.refundAddress, |
| 257 | 'isFixedRateMode': isFixedRateMode, |
| 258 | 'isSendAll': isSendAll, |
| 259 | 'body': body, |
| 260 | 'url': uri.toString(), |
| 261 | }, |
| 262 | responseData: { |
| 263 | 'id': id, |
| 264 | 'inputAddress': inputAddress, |
| 265 | 'payoutAddress': payoutAddress, |
| 266 | 'settleAddress': settleAddress, |
| 267 | 'extraId': extraId, |
| 268 | 'receiveAmount': receiveAmount, |
| 269 | 'statusCode': response.statusCode, |
| 270 | 'responseJSON': responseJSON, |
| 271 | }, |
| 272 | ); |
| 273 | |
| 274 | return Trade( |
| 275 | id: id, |
| 276 | provider: description, |
| 277 | from: request.fromCurrency, |
| 278 | to: request.toCurrency, |
| 279 | inputAddress: inputAddress, |
| 280 | refundAddress: settleAddress, |
| 281 | extraId: extraId, |
| 282 | state: TradeState.created, |
| 283 | amount: request.fromAmount, |
| 284 | receiveAmount: receiveAmount ?? request.toAmount, |
| 285 | payoutAddress: payoutAddress, |
| 286 | createdAt: DateTime.now(), |
| 287 | isSendAll: isSendAll, |
| 288 | toAddressExtraId: request.toAddressExtraId, |
| 289 | ); |
| 290 | } |
| 291 | |
| 292 | @override |
| 293 | Future<Trade> findTradeById({required String id}) async { |
| 294 | final params = {'api_key': apiKey, 'id': id}; |
| 295 | final uri = Uri.https(apiAuthority, getExchangePath, params); |
| 296 | final response = await ProxyWrapper().get(clearnetUri: uri); |
| 297 | |
| 298 | if (response.statusCode == 404) { |
| 299 | throw TradeNotFoundException(id, provider: description); |
| 300 | } |
| 301 | |
| 302 | if (response.statusCode == 400) { |
| 303 | final responseJSON = json.decode(response.body) as Map<String, dynamic>; |
| 304 | final error = responseJSON['message'] as String; |
| 305 | |
| 306 | throw TradeNotFoundException(id, provider: description, description: error); |
| 307 | } |
| 308 | |
| 309 | if (response.statusCode != 200) { |
| 310 | throw Exception('Unexpected http status: ${response.statusCode}'); |
| 311 | } |
| 312 | |
| 313 | final responseJSON = json.decode(response.body) as Map<String, dynamic>; |
| 314 | final fromCurrency = responseJSON['currency_from'] as String; |
| 315 | final toCurrency = responseJSON['currency_to'] as String; |
| 316 | final inputAddress = responseJSON['address_from'] as String; |
| 317 | final expectedSendAmount = responseJSON['expected_amount'].toString(); |
| 318 | final extraId = responseJSON['extra_id_from'] as String?; |
| 319 | final status = responseJSON['status'] as String; |
| 320 | final payoutAddress = responseJSON['address_to'] as String; |
| 321 | |
| 322 | final fromParsed = CryptoCurrency.safeParseCurrencyFromString(fromCurrency); |
| 323 | final toParsed = CryptoCurrency.safeParseCurrencyFromString(toCurrency); |
| 324 | return Trade( |
| 325 | id: id, |
| 326 | from: fromParsed, |
| 327 | to: toParsed, |
| 328 | extraId: extraId, |
| 329 | provider: description, |
| 330 | inputAddress: inputAddress, |
| 331 | amount: expectedSendAmount, |
| 332 | state: TradeState.deserialize(raw: status), |
| 333 | payoutAddress: payoutAddress, |
| 334 | ); |
| 335 | } |
| 336 | |
| 337 | static String _normalizeCurrency(CryptoCurrency currency) { |
| 338 | switch (currency) { |
| 339 | case CryptoCurrency.zec: |
| 340 | return 'zec'; |
| 341 | case CryptoCurrency.bnb: |
| 342 | return currency.tag!.toLowerCase(); |
| 343 | case CryptoCurrency.usdterc20: |
| 344 | return 'usdterc20'; |
| 345 | case CryptoCurrency.usdttrc20: |
| 346 | return 'usdttrc20'; |
| 347 | case CryptoCurrency.usdcpoly: |
| 348 | return 'usdcpoly'; |
| 349 | case CryptoCurrency.usdtPoly: |
| 350 | return 'usdtpoly'; |
| 351 | case CryptoCurrency.usdcEPoly: |
| 352 | return 'usdcepoly'; |
| 353 | case CryptoCurrency.usdcsol: |
| 354 | return 'usdcspl'; |
| 355 | case CryptoCurrency.matic: |
| 356 | return 'pol'; |
| 357 | case CryptoCurrency.maticpoly: |
| 358 | return 'matic'; |
| 359 | default: |
| 360 | return currency.title.toLowerCase(); |
| 361 | } |
| 362 | } |
| 363 | |
| 364 | String _normalizeAddress(String address) => |
| 365 | address.startsWith('bitcoincash:') ? address.replaceFirst('bitcoincash:', '') : address; |
| 366 | } |