| 1 | import 'dart:convert'; |
| 2 | import 'dart:developer'; |
| 3 | |
| 4 | import 'package:cake_wallet/.secrets.g.dart' as secrets; |
| 5 | import 'package:cake_wallet/exchange/provider/exchange_provider.dart'; |
| 6 | import 'package:cake_wallet/exchange/exchange_provider_description.dart'; |
| 7 | import 'package:cake_wallet/exchange/limits.dart'; |
| 8 | import 'package:cake_wallet/exchange/trade.dart'; |
| 9 | import 'package:cake_wallet/exchange/trade_not_created_exception.dart'; |
| 10 | import 'package:cake_wallet/exchange/trade_request.dart'; |
| 11 | import 'package:cake_wallet/exchange/trade_state.dart'; |
| 12 | import 'package:cw_core/utils/proxy_wrapper.dart'; |
| 13 | import 'package:cw_core/crypto_currency.dart'; |
| 14 | import 'package:cw_core/utils/print_verbose.dart'; |
| 15 | import 'package:cake_wallet/utils/exchange_provider_logger.dart'; |
| 16 | |
| 17 | class LetsExchangeExchangeProvider extends ExchangeProvider { |
| 18 | LetsExchangeExchangeProvider(); |
| 19 | |
| 20 | static const apiKey = secrets.letsExchangeBearerToken; |
| 21 | static const _baseUrl = 'api.letsexchange.io'; |
| 22 | static const _infoPath = '/api/v1/info'; |
| 23 | static const _infoRevertPath = '/api/v1/info-revert'; |
| 24 | static const _createTransactionPath = '/api/v1/transaction'; |
| 25 | static const _createTransactionRevertPath = '/api/v1/transaction-revert'; |
| 26 | static const _getTransactionPath = '/api/v1/transaction'; |
| 27 | |
| 28 | static const _affiliateId = secrets.letsExchangeAffiliateId; |
| 29 | |
| 30 | @override |
| 31 | String get title => 'LetsExchange'; |
| 32 | |
| 33 | @override |
| 34 | bool get isAvailable => true; |
| 35 | |
| 36 | @override |
| 37 | bool get isEnabled => true; |
| 38 | |
| 39 | @override |
| 40 | bool get supportsFixedRate => true; |
| 41 | |
| 42 | @override |
| 43 | ExchangeProviderDescription get description => ExchangeProviderDescription.letsExchange; |
| 44 | |
| 45 | @override |
| 46 | Future<bool> checkIsAvailable() async => true; |
| 47 | |
| 48 | @override |
| 49 | Future<Limits?> fetchLimits( |
| 50 | {required CryptoCurrency from, |
| 51 | required CryptoCurrency to, |
| 52 | required bool isFixedRateMode}) async { |
| 53 | final networkFrom = _getNetworkType(from); |
| 54 | final networkTo = _getNetworkType(to); |
| 55 | |
| 56 | try { |
| 57 | final params = { |
| 58 | 'from': from.title, |
| 59 | 'to': to.title, |
| 60 | if (networkFrom != null) 'network_from': networkFrom, |
| 61 | if (networkTo != null) 'network_to': networkTo, |
| 62 | 'amount': '1', |
| 63 | 'affiliate_id': _affiliateId, |
| 64 | 'float': isFixedRateMode ? 'false' : 'true', |
| 65 | }; |
| 66 | |
| 67 | final responseJSON = await _getInfo(params, isFixedRateMode); |
| 68 | final min = double.tryParse(responseJSON['min_amount'] as String); |
| 69 | final max = double.tryParse(responseJSON['max_amount'] as String); |
| 70 | return Limits(min: min, max: max); |
| 71 | } catch (e) { |
| 72 | log(e.toString()); |
| 73 | throw Exception('Failed to fetch limits'); |
| 74 | } |
| 75 | } |
| 76 | |
| 77 | @override |
| 78 | Future<double> fetchRate( |
| 79 | {required CryptoCurrency from, |
| 80 | required CryptoCurrency to, |
| 81 | required double amount, |
| 82 | required bool isFixedRateMode, |
| 83 | required bool isReceiveAmount}) async { |
| 84 | final networkFrom = _getNetworkType(from); |
| 85 | final networkTo = _getNetworkType(to); |
| 86 | try { |
| 87 | final params = { |
| 88 | 'from': from.title, |
| 89 | 'to': to.title, |
| 90 | if (networkFrom != null) 'network_from': networkFrom, |
| 91 | if (networkTo != null) 'network_to': networkTo, |
| 92 | 'amount': amount.toString(), |
| 93 | 'affiliate_id': _affiliateId, |
| 94 | 'float': isFixedRateMode ? 'false' : 'true', |
| 95 | }; |
| 96 | |
| 97 | final responseJSON = await _getInfo(params, isFixedRateMode); |
| 98 | |
| 99 | final amountToGet = double.tryParse(responseJSON['amount'] as String) ?? 0.0; |
| 100 | |
| 101 | if (amountToGet == 0.0) return 0.0; |
| 102 | |
| 103 | final rate = isFixedRateMode ? amount / amountToGet : amountToGet / amount; |
| 104 | |
| 105 | ExchangeProviderLogger.logSuccess( |
| 106 | provider: description, |
| 107 | function: 'fetchRate', |
| 108 | requestData: { |
| 109 | 'from': from.title, |
| 110 | 'to': to.title, |
| 111 | 'amount': amount, |
| 112 | 'isFixedRateMode': isFixedRateMode, |
| 113 | 'isReceiveAmount': isReceiveAmount, |
| 114 | 'networkFrom': networkFrom, |
| 115 | 'networkTo': networkTo, |
| 116 | 'params': params, |
| 117 | }, |
| 118 | responseData: { |
| 119 | 'amountToGet': amountToGet, |
| 120 | 'rate': rate, |
| 121 | 'responseJSON': responseJSON, |
| 122 | }, |
| 123 | ); |
| 124 | |
| 125 | return rate; |
| 126 | } catch (e, s) { |
| 127 | ExchangeProviderLogger.logError( |
| 128 | provider: description, |
| 129 | function: 'fetchRate', |
| 130 | error: e, |
| 131 | stackTrace: s, |
| 132 | requestData: { |
| 133 | 'from': from.title, |
| 134 | 'to': to.title, |
| 135 | 'amount': amount, |
| 136 | 'isFixedRateMode': isFixedRateMode, |
| 137 | 'isReceiveAmount': isReceiveAmount, |
| 138 | 'networkFrom': networkFrom, |
| 139 | 'networkTo': networkTo, |
| 140 | }, |
| 141 | ); |
| 142 | printV(e.toString()); |
| 143 | return 0.0; |
| 144 | } |
| 145 | } |
| 146 | |
| 147 | @override |
| 148 | Future<Trade> createTrade( |
| 149 | {required TradeRequest request, |
| 150 | required bool isFixedRateMode, |
| 151 | required bool isSendAll}) async { |
| 152 | final networkFrom = _getNetworkType(request.fromCurrency); |
| 153 | final networkTo = _getNetworkType(request.toCurrency); |
| 154 | try { |
| 155 | final params = { |
| 156 | 'from': request.fromCurrency.title, |
| 157 | 'to': request.toCurrency.title, |
| 158 | if (networkFrom != null) 'network_from': networkFrom, |
| 159 | if (networkTo != null) 'network_to': networkTo, |
| 160 | 'amount': isFixedRateMode ? request.toAmount.toString() : request.fromAmount.toString(), |
| 161 | 'affiliate_id': _affiliateId, |
| 162 | 'float': isFixedRateMode ? 'false' : 'true', |
| 163 | }; |
| 164 | |
| 165 | final responseInfoJSON = await _getInfo(params, isFixedRateMode); |
| 166 | final rateId = responseInfoJSON['rate_id'] as String; |
| 167 | |
| 168 | final withdrawalAddress = _normalizeBchAddress(request.toAddress); |
| 169 | final returnAddress = _normalizeBchAddress(request.refundAddress); |
| 170 | |
| 171 | final tradeParams = { |
| 172 | 'coin_from': request.fromCurrency.title, |
| 173 | 'coin_to': request.toCurrency.title, |
| 174 | if (!isFixedRateMode) 'deposit_amount': request.fromAmount.toString(), |
| 175 | 'withdrawal': withdrawalAddress, |
| 176 | if (isFixedRateMode) 'withdrawal_amount': request.toAmount.toString(), |
| 177 | 'withdrawal_extra_id': request.toAddressExtraId, |
| 178 | 'return': returnAddress, |
| 179 | 'rate_id': rateId, |
| 180 | if (networkFrom != null) 'network_from': networkFrom, |
| 181 | if (networkTo != null) 'network_to': networkTo, |
| 182 | 'affiliate_id': _affiliateId, |
| 183 | 'float': isFixedRateMode ? 'false' : 'true', |
| 184 | }; |
| 185 | |
| 186 | final headers = { |
| 187 | 'Content-Type': 'application/json', |
| 188 | 'Accept': 'application/json', |
| 189 | 'Authorization': apiKey |
| 190 | }; |
| 191 | |
| 192 | final uri = Uri.https( |
| 193 | _baseUrl, isFixedRateMode ? _createTransactionRevertPath : _createTransactionPath); |
| 194 | final response = await ProxyWrapper().post( |
| 195 | clearnetUri: uri, |
| 196 | headers: headers, |
| 197 | body: json.encode(tradeParams), |
| 198 | ); |
| 199 | |
| 200 | if (response.statusCode != 200) { |
| 201 | ExchangeProviderLogger.logError( |
| 202 | provider: description, |
| 203 | function: 'createTrade', |
| 204 | error: Exception('LetsExchange create trade failed: ${response.body}'), |
| 205 | stackTrace: StackTrace.current, |
| 206 | requestData: { |
| 207 | 'from': request.fromCurrency.title, |
| 208 | 'to': request.toCurrency.title, |
| 209 | 'fromAmount': request.fromAmount, |
| 210 | 'toAmount': request.toAmount, |
| 211 | 'toAddress': request.toAddress, |
| 212 | 'refundAddress': request.refundAddress, |
| 213 | 'isFixedRateMode': isFixedRateMode, |
| 214 | 'isSendAll': isSendAll, |
| 215 | 'networkFrom': networkFrom, |
| 216 | 'networkTo': networkTo, |
| 217 | 'tradeParams': tradeParams, |
| 218 | 'url': uri.toString(), |
| 219 | }, |
| 220 | ); |
| 221 | throw Exception('LetsExchange create trade failed: ${response.body}'); |
| 222 | } |
| 223 | final responseJSON = json.decode(response.body) as Map<String, dynamic>; |
| 224 | final id = responseJSON['transaction_id'] as String; |
| 225 | final from = responseJSON['coin_from'] as String; |
| 226 | final to = responseJSON['coin_to'] as String; |
| 227 | final payoutAddress = responseJSON['withdrawal'] as String; |
| 228 | final depositAddress = responseJSON['deposit'] as String; |
| 229 | final refundAddress = responseJSON['return'] as String; |
| 230 | final depositAmount = responseJSON['deposit_amount'] as String; |
| 231 | final receiveAmount = responseJSON['withdrawal_amount'] as String; |
| 232 | final status = responseJSON['status'] as String; |
| 233 | |
| 234 | // We ignore the created_at from response and use DateTime.now() instead |
| 235 | final createdAtString = responseJSON['created_at'] as String; |
| 236 | final expiredAtTimestamp = responseJSON['expired_at'] as int; |
| 237 | final extraId = responseJSON['deposit_extra_id'] as String?; |
| 238 | |
| 239 | final createdAt = DateTime.now(); |
| 240 | final expiredAt = createdAt.add(Duration(minutes: 30)); |
| 241 | |
| 242 | CryptoCurrency fromCurrency; |
| 243 | if (request.fromCurrency.tag != null && request.fromCurrency.title == from) { |
| 244 | fromCurrency = request.fromCurrency; |
| 245 | } else { |
| 246 | fromCurrency = CryptoCurrency.fromString(from); |
| 247 | } |
| 248 | |
| 249 | CryptoCurrency toCurrency; |
| 250 | if (request.toCurrency.tag != null && request.toCurrency.title == to) { |
| 251 | toCurrency = request.toCurrency; |
| 252 | } else { |
| 253 | toCurrency = CryptoCurrency.fromString(to); |
| 254 | } |
| 255 | |
| 256 | ExchangeProviderLogger.logSuccess( |
| 257 | provider: description, |
| 258 | function: 'createTrade', |
| 259 | requestData: { |
| 260 | 'from': request.fromCurrency.title, |
| 261 | 'to': request.toCurrency.title, |
| 262 | 'fromAmount': request.fromAmount, |
| 263 | 'toAmount': request.toAmount, |
| 264 | 'toAddress': request.toAddress, |
| 265 | 'refundAddress': request.refundAddress, |
| 266 | 'isFixedRateMode': isFixedRateMode, |
| 267 | 'isSendAll': isSendAll, |
| 268 | 'networkFrom': networkFrom, |
| 269 | 'networkTo': networkTo, |
| 270 | 'tradeParams': tradeParams, |
| 271 | 'url': uri.toString(), |
| 272 | }, |
| 273 | responseData: { |
| 274 | 'id': id, |
| 275 | 'from': from, |
| 276 | 'to': to, |
| 277 | 'depositAddress': depositAddress, |
| 278 | 'payoutAddress': payoutAddress, |
| 279 | 'refundAddress': refundAddress, |
| 280 | 'depositAmount': depositAmount, |
| 281 | 'receiveAmount': receiveAmount, |
| 282 | 'status': status, |
| 283 | 'createdAt': createdAtString, |
| 284 | 'expiredAt': expiredAtTimestamp, |
| 285 | 'extraId': extraId, |
| 286 | 'statusCode': response.statusCode, |
| 287 | }, |
| 288 | ); |
| 289 | |
| 290 | return Trade( |
| 291 | id: id, |
| 292 | from: fromCurrency, |
| 293 | to: toCurrency, |
| 294 | provider: description, |
| 295 | inputAddress: depositAddress, |
| 296 | payoutAddress: payoutAddress, |
| 297 | refundAddress: refundAddress, |
| 298 | amount: depositAmount, |
| 299 | receiveAmount: receiveAmount, |
| 300 | state: TradeState.deserialize(raw: status), |
| 301 | createdAt: createdAt, |
| 302 | expiredAt: expiredAt, |
| 303 | extraId: extraId, |
| 304 | isSendAll: isSendAll, |
| 305 | toAddressExtraId: request.toAddressExtraId, |
| 306 | ); |
| 307 | } catch (e, s) { |
| 308 | ExchangeProviderLogger.logError( |
| 309 | provider: description, |
| 310 | function: 'createTrade', |
| 311 | error: e, |
| 312 | stackTrace: s, |
| 313 | requestData: { |
| 314 | 'from': request.fromCurrency.title, |
| 315 | 'to': request.toCurrency.title, |
| 316 | 'fromAmount': request.fromAmount, |
| 317 | 'toAmount': request.toAmount, |
| 318 | 'toAddress': request.toAddress, |
| 319 | 'refundAddress': request.refundAddress, |
| 320 | 'isFixedRateMode': isFixedRateMode, |
| 321 | 'isSendAll': isSendAll, |
| 322 | 'networkFrom': networkFrom, |
| 323 | 'networkTo': networkTo, |
| 324 | }, |
| 325 | ); |
| 326 | log(e.toString()); |
| 327 | throw TradeNotCreatedException(description); |
| 328 | } |
| 329 | } |
| 330 | |
| 331 | @override |
| 332 | Future<Trade> findTradeById({required String id}) async { |
| 333 | final headers = { |
| 334 | 'Content-Type': 'application/json', |
| 335 | 'Accept': 'application/json', |
| 336 | 'Authorization': apiKey |
| 337 | }; |
| 338 | |
| 339 | final url = Uri.https(_baseUrl, '$_getTransactionPath/$id'); |
| 340 | final response = await ProxyWrapper().get(clearnetUri: url, headers: headers); |
| 341 | |
| 342 | if (response.statusCode != 200) { |
| 343 | throw Exception('LetsExchange fetch trade failed: ${response.body}'); |
| 344 | } |
| 345 | final responseJSON = json.decode(response.body) as Map<String, dynamic>; |
| 346 | |
| 347 | // Parsing 'from' currency |
| 348 | final fromCurrency = responseJSON['coin_from'] as String; |
| 349 | final fromNetwork = responseJSON['coin_from_network'] as String?; |
| 350 | final normalizedFromNetwork = _normalizeNetworkType(fromNetwork ?? ''); |
| 351 | final fromTag = fromCurrency == normalizedFromNetwork ? null : normalizedFromNetwork; |
| 352 | final from = CryptoCurrency.safeParseCurrencyFromString(fromCurrency, tag: fromTag); |
| 353 | |
| 354 | // Parsing 'to' currency |
| 355 | final toCurrency = responseJSON['coin_to'] as String; |
| 356 | final toNetwork = responseJSON['coin_to_network'] as String?; |
| 357 | final normalizedToNetwork = _normalizeNetworkType(toNetwork ?? ''); |
| 358 | final toTag = toCurrency == normalizedToNetwork ? null : normalizedToNetwork; |
| 359 | final to = CryptoCurrency.safeParseCurrencyFromString(toCurrency, tag: toTag); |
| 360 | |
| 361 | final payoutAddress = responseJSON['withdrawal'] as String; |
| 362 | final depositAddress = responseJSON['deposit'] as String; |
| 363 | final refundAddress = responseJSON['return'] as String; |
| 364 | final depositAmount = responseJSON['deposit_amount'] as String; |
| 365 | final receiveAmount = responseJSON['withdrawal_amount'] as String; |
| 366 | final status = responseJSON['status'] as String; |
| 367 | |
| 368 | final extraId = responseJSON['deposit_extra_id'] as String?; |
| 369 | |
| 370 | return Trade( |
| 371 | id: id, |
| 372 | from: from, |
| 373 | to: to, |
| 374 | provider: description, |
| 375 | inputAddress: depositAddress, |
| 376 | payoutAddress: payoutAddress, |
| 377 | refundAddress: refundAddress, |
| 378 | amount: depositAmount, |
| 379 | receiveAmount: receiveAmount, |
| 380 | state: TradeState.deserialize(raw: status), |
| 381 | isRefund: status == 'refund', |
| 382 | extraId: extraId, |
| 383 | ); |
| 384 | } |
| 385 | |
| 386 | Future<Map<String, dynamic>> _getInfo(Map<String, String> params, bool isFixedRateMode) async { |
| 387 | final headers = { |
| 388 | 'Content-Type': 'application/json', |
| 389 | 'Accept': 'application/json', |
| 390 | 'Authorization': apiKey |
| 391 | }; |
| 392 | |
| 393 | try { |
| 394 | final uri = Uri.https(_baseUrl, isFixedRateMode ? _infoRevertPath : _infoPath); |
| 395 | final response = await ProxyWrapper().post( |
| 396 | clearnetUri: uri, |
| 397 | headers: headers, |
| 398 | body: json.encode(params), |
| 399 | ); |
| 400 | |
| 401 | if (response.statusCode != 200) { |
| 402 | throw Exception('LetsExchange fetch info failed: ${response.body}'); |
| 403 | } |
| 404 | return json.decode(response.body) as Map<String, dynamic>; |
| 405 | } catch (e) { |
| 406 | throw Exception('LetsExchange failed to fetch info ${e.toString()}'); |
| 407 | } |
| 408 | } |
| 409 | |
| 410 | String? _getNetworkType(CryptoCurrency currency) { |
| 411 | if (currency.tag != null && currency.tag!.isNotEmpty) { |
| 412 | switch (currency.tag!) { |
| 413 | case 'TRX': |
| 414 | return 'TRC20'; |
| 415 | case 'ETH': |
| 416 | return 'ERC20'; |
| 417 | case 'BSC': |
| 418 | return 'BEP20'; |
| 419 | case 'ARB': |
| 420 | return 'ARBITRUM'; |
| 421 | default: |
| 422 | return currency.tag!; |
| 423 | } |
| 424 | } |
| 425 | |
| 426 | return _normalizeTitleToNetwork(currency.title); |
| 427 | } |
| 428 | |
| 429 | String _normalizeNetworkType(String network) { |
| 430 | return switch (network.toUpperCase()) { |
| 431 | 'ERC20' => 'ETH', |
| 432 | 'TRC20' => 'TRX', |
| 433 | 'BEP20' => 'BSC', |
| 434 | 'ARBITRUM' => 'ARB', |
| 435 | _ => network, |
| 436 | }; |
| 437 | } |
| 438 | |
| 439 | String _normalizeTitleToNetwork(String title) { |
| 440 | return switch (title.toUpperCase()) { |
| 441 | 'ARB' => 'ARBITRUM', |
| 442 | _ => title, |
| 443 | }; |
| 444 | } |
| 445 | |
| 446 | String _normalizeBchAddress(String address) => |
| 447 | address.startsWith('bitcoincash:') ? address.substring(12) : address; |
| 448 | } |