| 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_request.dart'; |
| 10 | import 'package:cake_wallet/exchange/trade_state.dart'; |
| 11 | import 'package:cw_core/amount_converter.dart'; |
| 12 | import 'package:cw_core/utils/print_verbose.dart'; |
| 13 | import 'package:cw_core/utils/proxy_wrapper.dart'; |
| 14 | import 'package:cw_core/crypto_currency.dart'; |
| 15 | |
| 16 | class SwapsXyzExchangeProvider extends ExchangeProvider { |
| 17 | SwapsXyzExchangeProvider(); |
| 18 | |
| 19 | static final List<CryptoCurrency> _notSupportedAsSourceToken = [ |
| 20 | CryptoCurrency.sol, |
| 21 | ...CryptoCurrency.all.where( |
| 22 | (c) => (c.tag ?? '').toUpperCase() == 'SOL' || c.tag == CryptoCurrency.bnb.tag, |
| 23 | ), |
| 24 | ]; |
| 25 | |
| 26 | static const _transferSig = '0xa9059cbb'; |
| 27 | static const _swapAndExecuteSig = '0x9be111d1'; |
| 28 | |
| 29 | static final _apiKey = secrets.swapsXyzApiKey; |
| 30 | static const _baseUrl = 'api-v2.swaps.xyz'; |
| 31 | static const _getChainList = 'api/getChainList'; |
| 32 | static const _getPaths = 'api/getPaths'; |
| 33 | static const _getQuotePaths = 'api/getQuote'; |
| 34 | static const _getAction = 'api/getAction'; |
| 35 | static const _registerTxs = 'api/registerTxs'; |
| 36 | static const _getStatus = 'api/getStatus'; |
| 37 | |
| 38 | static final _headers = {'x-api-key': _apiKey}; |
| 39 | |
| 40 | static final _supportedChainList = <Chain>[]; |
| 41 | final Map<int, List<TokenPathInfo>> _tokensCache = {}; |
| 42 | |
| 43 | @override |
| 44 | String get title => 'Swaps.XYZ'; |
| 45 | |
| 46 | @override |
| 47 | bool get isAvailable => true; |
| 48 | |
| 49 | @override |
| 50 | bool get isEnabled => true; |
| 51 | |
| 52 | // There is an issue with fixed-rate swaps on Swaps.XYZ |
| 53 | // when they don't guarantee that the trade will be created at the requested amount. |
| 54 | @override |
| 55 | bool get supportsFixedRate => false; |
| 56 | |
| 57 | @override |
| 58 | bool get supportsMemoOrDestinationTag => false; |
| 59 | |
| 60 | @override |
| 61 | ExchangeProviderDescription get description => ExchangeProviderDescription.swapsXyz; |
| 62 | |
| 63 | @override |
| 64 | Future<bool> checkIsAvailable() async => true; |
| 65 | |
| 66 | @override |
| 67 | Future<Limits?> fetchLimits({ |
| 68 | required CryptoCurrency from, |
| 69 | required CryptoCurrency to, |
| 70 | required bool isFixedRateMode, |
| 71 | }) async { |
| 72 | try { |
| 73 | final chains = await _geSupportedChain(); |
| 74 | if (chains.isEmpty) throw Exception('Failed to fetch supported chains'); |
| 75 | |
| 76 | final fromToUse = isFixedRateMode ? to : from; |
| 77 | final toToUse = isFixedRateMode ? from : to; |
| 78 | |
| 79 | final srcChain = _findChainByCurrency(fromToUse, chains); |
| 80 | final dstChain = _findChainByCurrency(toToUse, chains); |
| 81 | |
| 82 | await _ensureTokensCached( |
| 83 | fromChain: srcChain, toChain: dstChain, from: fromToUse, to: toToUse); |
| 84 | |
| 85 | final srcToken = _getTokenAddress(currency: fromToUse, chain: srcChain); |
| 86 | final dstToken = _getTokenAddress(currency: toToUse, chain: dstChain); |
| 87 | |
| 88 | final params = { |
| 89 | 'srcChainId': '${srcChain.chainId}', |
| 90 | 'srcToken': srcToken, |
| 91 | 'dstChainId': '${dstChain.chainId}', |
| 92 | 'dstToken': dstToken, |
| 93 | }; |
| 94 | |
| 95 | final uri = Uri.https(_baseUrl, _getPaths, params); |
| 96 | final res = await ProxyWrapper().get(clearnetUri: uri, headers: _headers); |
| 97 | if (res.statusCode != 200) { |
| 98 | throw Exception('Unexpected http status: ${res.statusCode}'); |
| 99 | } |
| 100 | |
| 101 | final body = json.decode(res.body) as Map<String, dynamic>; |
| 102 | |
| 103 | final paths = (body['paths'] as List? ?? const []).cast<Map<String, dynamic>>(); |
| 104 | if (paths.isEmpty) { |
| 105 | throw Exception('No paths for ${fromToUse.title} -> ${toToUse.title}'); |
| 106 | } |
| 107 | |
| 108 | final int requestedDstId = dstChain.chainId; |
| 109 | |
| 110 | Map<String, dynamic> path = paths.firstWhere( |
| 111 | (p) => p['chainId'] == requestedDstId, |
| 112 | orElse: () => <String, dynamic>{}, |
| 113 | ); |
| 114 | |
| 115 | if (path.isEmpty) { |
| 116 | path = paths.firstWhere( |
| 117 | (p) => (p['tokens'] is List) || p['amountLimits'] != null, |
| 118 | orElse: () => paths.first, |
| 119 | ); |
| 120 | } |
| 121 | |
| 122 | final supportsExactAmountIn = path['supportsExactAmountIn'] as bool? ?? false; |
| 123 | final supportsExactAmountOut = path['supportsExactAmountOut'] as bool? ?? false; |
| 124 | |
| 125 | if (isFixedRateMode && !supportsExactAmountOut) { |
| 126 | throw Exception('This route does not support fixed receive (exact-amount-out)'); |
| 127 | } |
| 128 | if (!isFixedRateMode && !supportsExactAmountIn) { |
| 129 | throw Exception('This route does not support exact send (exact-amount-in)'); |
| 130 | } |
| 131 | |
| 132 | Map<String, dynamic>? useLimits; |
| 133 | |
| 134 | if (isFixedRateMode) { |
| 135 | final tokensField = path['tokens']; |
| 136 | useLimits = null; |
| 137 | |
| 138 | if (tokensField is List && tokensField.isNotEmpty) { |
| 139 | final tokens = tokensField.cast<Map<String, dynamic>>(); |
| 140 | String norm(String s) => s.toUpperCase(); |
| 141 | final wantSym = norm(_normalizeCakeNativeTokenName(toToUse.title)); |
| 142 | final wantAddr = (dstToken).toLowerCase(); |
| 143 | |
| 144 | final match = tokens.firstWhere( |
| 145 | (t) { |
| 146 | final sym = norm(t['symbol']?.toString() ?? ''); |
| 147 | final addr = (t['address']?.toString() ?? '').toLowerCase(); |
| 148 | return sym == wantSym || (addr.isNotEmpty && addr == wantAddr); |
| 149 | }, |
| 150 | orElse: () => const <String, dynamic>{}, |
| 151 | ); |
| 152 | |
| 153 | if (match.isNotEmpty) { |
| 154 | useLimits = { |
| 155 | 'minAmount': match['minAmount'], |
| 156 | 'maxAmount': match['maxAmount'], |
| 157 | }; |
| 158 | } |
| 159 | } |
| 160 | } else { |
| 161 | // Floating/Exact-in: use the route-level limits |
| 162 | useLimits = path['amountLimits'] as Map<String, dynamic>?; |
| 163 | } |
| 164 | |
| 165 | final min = double.tryParse((useLimits?['minAmount'])?.toString() ?? ''); |
| 166 | final max = double.tryParse((useLimits?['maxAmount'])?.toString() ?? ''); |
| 167 | return Limits(min: min, max: max); |
| 168 | } catch (e) { |
| 169 | printV('fetchLimits error: $e'); |
| 170 | throw Exception('Error fetching limits: $e'); |
| 171 | } |
| 172 | } |
| 173 | |
| 174 | Future<_PathInfo?> _pickPath({ |
| 175 | required int srcChainId, |
| 176 | required String srcToken, |
| 177 | required int dstChainId, |
| 178 | required String dstToken, |
| 179 | }) async { |
| 180 | final uri = Uri.https(_baseUrl, _getPaths, { |
| 181 | 'srcChainId': '$srcChainId', |
| 182 | 'srcToken': srcToken, |
| 183 | 'dstChainId': '$dstChainId', |
| 184 | 'dstToken': dstToken, |
| 185 | }); |
| 186 | final res = await ProxyWrapper().get(clearnetUri: uri, headers: _headers); |
| 187 | if (res.statusCode != 200) return null; |
| 188 | final body = json.decode(res.body) as Map<String, dynamic>; |
| 189 | final paths = (body['paths'] as List?)?.cast<Map<String, dynamic>>() ?? const []; |
| 190 | if (paths.isEmpty) return null; |
| 191 | final p = paths.first; |
| 192 | return _PathInfo( |
| 193 | supportsExactOut: p['supportsExactAmountOut'] == true, |
| 194 | minToAmountHuman: (p['amountLimits']?['minAmount'] as String?) ?? '0', |
| 195 | ); |
| 196 | } |
| 197 | |
| 198 | @override |
| 199 | Future<double> fetchRate( |
| 200 | {required CryptoCurrency from, |
| 201 | required CryptoCurrency to, |
| 202 | required double amount, |
| 203 | required bool isFixedRateMode, |
| 204 | required bool isReceiveAmount}) async { |
| 205 | try { |
| 206 | if (_notSupportedAsSourceToken.contains(from) || _notSupportedAsSourceToken.contains(to)) { |
| 207 | printV('fetchRate: source token ${from.title} is not supported as source token'); |
| 208 | return 0.0; |
| 209 | } |
| 210 | |
| 211 | final chains = await _geSupportedChain(); |
| 212 | if (chains.isEmpty) return 0.0; |
| 213 | |
| 214 | final srcChain = _findChainByCurrency(from, chains); |
| 215 | final dstChain = _findChainByCurrency(to, chains); |
| 216 | |
| 217 | await _ensureTokensCached(fromChain: srcChain, toChain: dstChain, from: from, to: to); |
| 218 | |
| 219 | final srcToken = _getTokenAddress(currency: from, chain: srcChain); |
| 220 | final dstToken = _getTokenAddress(currency: to, chain: dstChain); |
| 221 | |
| 222 | if (isReceiveAmount) { |
| 223 | final path = await _pickPath( |
| 224 | srcChainId: srcChain.chainId, |
| 225 | srcToken: srcToken, |
| 226 | dstChainId: dstChain.chainId, |
| 227 | dstToken: dstToken, |
| 228 | ); |
| 229 | if (path == null || !path.supportsExactOut) { |
| 230 | printV( |
| 231 | 'fetchRate: route does not support exact-amount-out for ${from.title} -> ${to.title}'); |
| 232 | return 0.0; |
| 233 | } |
| 234 | } |
| 235 | |
| 236 | final humanAmountStr = amount.toString(); |
| 237 | final formattedAmount = AmountConverter.toBaseUnits( |
| 238 | humanAmountStr, |
| 239 | isReceiveAmount ? to.decimals : from.decimals, |
| 240 | ); |
| 241 | |
| 242 | final params = { |
| 243 | 'swapDirection': isReceiveAmount ? 'exact-amount-out' : 'exact-amount-in', |
| 244 | 'srcToken': srcToken, |
| 245 | 'dstToken': dstToken, |
| 246 | 'srcChainId': '${srcChain.chainId}', |
| 247 | 'dstChainId': '${dstChain.chainId}', |
| 248 | 'amount': formattedAmount, |
| 249 | }; |
| 250 | |
| 251 | final uri = Uri.https(_baseUrl, _getQuotePaths, params); |
| 252 | final response = await ProxyWrapper().get(clearnetUri: uri, headers: _headers); |
| 253 | |
| 254 | if (response.statusCode != 200) { |
| 255 | printV('fetchRate failed: ${response.body}'); |
| 256 | return 0.0; |
| 257 | } |
| 258 | |
| 259 | final data = json.decode(response.body) as Map<String, dynamic>; |
| 260 | final exchangeRate = (data['exchangeRate'] as num?)?.toDouble() ?? 0.0; |
| 261 | return exchangeRate; |
| 262 | } catch (e) { |
| 263 | printV('fetchRate error: $e'); |
| 264 | return 0.0; |
| 265 | } |
| 266 | } |
| 267 | |
| 268 | @override |
| 269 | Future<Trade> createTrade({ |
| 270 | required TradeRequest request, |
| 271 | required bool isFixedRateMode, |
| 272 | required bool isSendAll, |
| 273 | }) async { |
| 274 | try { |
| 275 | final sender = request.refundAddress.trim(); |
| 276 | final recipient = request.toAddress.trim(); |
| 277 | if (sender.isEmpty || recipient.isEmpty) { |
| 278 | throw Exception('Sender (refundAddress) or recipient (toAddress) is empty'); |
| 279 | } |
| 280 | |
| 281 | final chains = await _geSupportedChain(); |
| 282 | if (chains.isEmpty) throw Exception('Failed to fetch supported chains'); |
| 283 | final srcChain = _findChainByCurrency(request.fromCurrency, chains); |
| 284 | final dstChain = _findChainByCurrency(request.toCurrency, chains); |
| 285 | |
| 286 | await _ensureTokensCached( |
| 287 | fromChain: srcChain, |
| 288 | toChain: dstChain, |
| 289 | from: request.fromCurrency, |
| 290 | to: request.toCurrency, |
| 291 | ); |
| 292 | |
| 293 | final srcToken = _getTokenAddress(currency: request.fromCurrency, chain: srcChain); |
| 294 | final dstToken = _getTokenAddress(currency: request.toCurrency, chain: dstChain); |
| 295 | |
| 296 | final amountStr = isFixedRateMode ? request.toAmount : request.fromAmount; |
| 297 | final rawAmount = double.tryParse(amountStr) ?? 0.0; |
| 298 | if (rawAmount <= 0) throw Exception('Invalid amount'); |
| 299 | |
| 300 | final formattedAmount = AmountConverter.toBaseUnits( |
| 301 | amountStr, |
| 302 | isFixedRateMode ? request.toCurrency.decimals : request.fromCurrency.decimals, |
| 303 | ); |
| 304 | |
| 305 | final params = { |
| 306 | 'actionType': 'swap-action', |
| 307 | 'sender': sender, |
| 308 | 'srcChainId': '${srcChain.chainId}', |
| 309 | 'srcToken': srcToken, |
| 310 | 'dstChainId': '${dstChain.chainId}', |
| 311 | 'dstToken': dstToken, |
| 312 | 'slippage': '300', |
| 313 | 'swapDirection': isFixedRateMode ? 'exact-amount-out' : 'exact-amount-in', |
| 314 | 'amount': formattedAmount, |
| 315 | 'recipient': recipient, |
| 316 | }; |
| 317 | |
| 318 | final uri = Uri.https(_baseUrl, _getAction, params); |
| 319 | final res = await ProxyWrapper().get(clearnetUri: uri, headers: _headers); |
| 320 | |
| 321 | if (res.statusCode != 200) { |
| 322 | throw Exception('getAction failed: ${res.statusCode} ${res.body}'); |
| 323 | } |
| 324 | |
| 325 | final data = json.decode(res.body) as Map<String, dynamic>; |
| 326 | |
| 327 | final txId = data['txId'] as String? ?? ''; |
| 328 | |
| 329 | final vmId = data['vmId'] as String? ?? ''; |
| 330 | final txObj = (data['tx'] as Map?) ?? const {}; |
| 331 | |
| 332 | final txTo = txObj['to']?.toString(); |
| 333 | final chainId = txObj['chainId']?.toString(); |
| 334 | final routerData = txObj['data']?.toString(); |
| 335 | |
| 336 | // Allow only: |
| 337 | // - null (native / deposit-address flow) |
| 338 | // - '0x' (no call data) |
| 339 | // - ERC20 transfer(0xa9059cbb) selector |
| 340 | // - swapAndExecute(0x9be111d1) selector |
| 341 | final isAllowed = routerData == null || |
| 342 | routerData == '0x' || |
| 343 | _decodeMethodSelector(routerData) == _transferSig || |
| 344 | _decodeMethodSelector(routerData) == _swapAndExecuteSig; |
| 345 | |
| 346 | if (!isAllowed) { |
| 347 | throw Exception('Does not support that method selector'); |
| 348 | } |
| 349 | |
| 350 | final txValue = txObj['value']?.toString() ?? '0'; |
| 351 | |
| 352 | final bridgeIds = (data['bridgeIds'] as List?) ?? const []; |
| 353 | if (txId.isEmpty) throw Exception('No txId returned by getAction'); |
| 354 | |
| 355 | final amtIn = (data['amountIn'] as Map?) ?? const {}; |
| 356 | final amtInMax = (data['amountInMax'] as Map?) ?? const {}; |
| 357 | final srcTokenAddr = amtIn['address']?.toString(); |
| 358 | final srcTokenDecs = (amtIn['decimals'] as num?)?.toInt() ?? request.fromCurrency.decimals; |
| 359 | final requiresTokenApproval = data['requiresTokenApproval'] as bool? ?? false; |
| 360 | |
| 361 | final reqAmountStr = (amtInMax['amount'] ?? amtIn['amount'])?.toString() ?? '0'; |
| 362 | final reqAmountRaw = reqAmountStr.replaceAll('n', ''); |
| 363 | |
| 364 | final needToRegisterInSwapXyz = vmId == 'alt-vm' || |
| 365 | bridgeIds.contains('alt-vm') || |
| 366 | chainId == 'solana' || |
| 367 | bridgeIds.contains('solana'); |
| 368 | |
| 369 | final trade = Trade( |
| 370 | id: txId, |
| 371 | router: chainId, |
| 372 | providerId: vmId, |
| 373 | from: request.fromCurrency, |
| 374 | to: request.toCurrency, |
| 375 | provider: description, |
| 376 | inputAddress: txTo, |
| 377 | refundAddress: request.refundAddress, |
| 378 | state: TradeState.created, |
| 379 | providerName: title, |
| 380 | createdAt: DateTime.now(), |
| 381 | amount: request.fromAmount, |
| 382 | receiveAmount: request.toAmount, |
| 383 | payoutAddress: request.toAddress, |
| 384 | isSendAll: isSendAll, |
| 385 | needToRegisterInSwapXyz: needToRegisterInSwapXyz, |
| 386 | sourceTokenAddress: srcTokenAddr ?? srcToken, |
| 387 | sourceTokenDecimals: srcTokenDecs, |
| 388 | sourceTokenAmountRaw: reqAmountRaw, |
| 389 | requiresTokenApproval: requiresTokenApproval, |
| 390 | routerData: routerData, |
| 391 | routerValue: txValue, |
| 392 | ); |
| 393 | |
| 394 | return trade; |
| 395 | } catch (e) { |
| 396 | printV('createTrade error: $e'); |
| 397 | throw TradeNotCreatedException(description, description: e.toString()); |
| 398 | } |
| 399 | } |
| 400 | |
| 401 | /// Register a broadcasted tx with Swaps.xyz (required for alt-vm). |
| 402 | static Future<bool> registerAltVmTx({ |
| 403 | required String txId, |
| 404 | required String txHash, |
| 405 | required int chainId, |
| 406 | required String vmId, |
| 407 | }) async { |
| 408 | try { |
| 409 | final uri = Uri.https(_baseUrl, _registerTxs); |
| 410 | final payload = { |
| 411 | 'txId': txId, |
| 412 | 'vmId': vmId, |
| 413 | 'txHash': txHash, |
| 414 | 'chainId': chainId, |
| 415 | }; |
| 416 | |
| 417 | final res = await ProxyWrapper().post( |
| 418 | clearnetUri: uri, |
| 419 | headers: { |
| 420 | ..._headers, |
| 421 | 'content-type': 'application/json', |
| 422 | }, |
| 423 | body: jsonEncode(payload), |
| 424 | ); |
| 425 | |
| 426 | if (res.statusCode != 200) { |
| 427 | printV('registerTxs failed: ${res.statusCode} ${res.body}'); |
| 428 | return false; |
| 429 | } |
| 430 | final List<dynamic> body = json.decode(res.body) as List<dynamic>; |
| 431 | if (body.isEmpty) return false; |
| 432 | |
| 433 | final isSuccess = (body[0] as Map<String, dynamic>)['success'] as bool? ?? false; |
| 434 | |
| 435 | return isSuccess; |
| 436 | } catch (e) { |
| 437 | printV('registerAltVmTx error: $e'); |
| 438 | return false; |
| 439 | } |
| 440 | } |
| 441 | |
| 442 | @override |
| 443 | Future<Trade> findTradeById({required String id}) async { |
| 444 | if (id.isEmpty) { |
| 445 | throw Exception('Trade id is empty'); |
| 446 | } |
| 447 | |
| 448 | final uri = Uri.https(_baseUrl, _getStatus, {'txId': id}); |
| 449 | final resp = await ProxyWrapper().get(clearnetUri: uri, headers: _headers); |
| 450 | |
| 451 | if (resp.statusCode != 200) { |
| 452 | throw Exception('getStatus failed: ${resp.statusCode} ${resp.body}'); |
| 453 | } |
| 454 | |
| 455 | final data = json.decode(resp.body) as Map<String, dynamic>; |
| 456 | final isSuccess = (data['success'] as bool?); |
| 457 | |
| 458 | if (isSuccess != null && !isSuccess) { |
| 459 | final error = data['error'] as Map<String, dynamic>?; |
| 460 | if (error != null) { |
| 461 | final code = error['code']?.toString() ?? 'unknown'; |
| 462 | throw Exception('SwapXyzExchangeProvider findTradeById error: ($id) $code'); |
| 463 | } |
| 464 | } |
| 465 | |
| 466 | final statusStr = (data['status'] as String?)?.toLowerCase() ?? 'NOT_FOUND'; |
| 467 | final state = _mapSwapsStatusToTradeState(statusStr); |
| 468 | |
| 469 | final refundAddress = data['sender']?.toString(); |
| 470 | |
| 471 | final srcTransaction = (data['srcTx'] as Map?)?.cast<String, dynamic>(); |
| 472 | final dstTransaction = (data['dstTx'] as Map?)?.cast<String, dynamic>(); |
| 473 | |
| 474 | final inputAddress = srcTransaction?['toAddress']?.toString(); |
| 475 | |
| 476 | final payoutAddress = dstTransaction?['toAddress']?.toString(); |
| 477 | |
| 478 | final srcPaymentToken = (srcTransaction?['paymentToken'] as Map?)?.cast<String, dynamic>(); |
| 479 | final dstPaymentToken = (dstTransaction?['paymentToken'] as Map?)?.cast<String, dynamic>(); |
| 480 | |
| 481 | final fromSymbol = (srcPaymentToken?['symbol'] as String?) ?? ''; |
| 482 | final toSymbol = (dstPaymentToken?['symbol'] as String?) ?? ''; |
| 483 | |
| 484 | CryptoCurrency? toCurrency; |
| 485 | if (toSymbol.isNotEmpty) { |
| 486 | toCurrency = CryptoCurrency.safeParseCurrencyFromString(toSymbol); |
| 487 | } |
| 488 | |
| 489 | final srcDecimals = (srcPaymentToken?['decimals'] as num?)?.toInt() ?? 0; |
| 490 | final dstDecimals = (dstPaymentToken?['decimals'] as num?)?.toInt() ?? 0; |
| 491 | |
| 492 | final txHash = srcTransaction?['txHash'] as String?; |
| 493 | |
| 494 | // Minimal-unit amounts like "12000n" |
| 495 | final srcAmountRaw = srcPaymentToken?['amount']?.toString(); |
| 496 | final dstAmountRaw = dstPaymentToken?['amount']?.toString(); |
| 497 | String? receiveAmount; |
| 498 | if (dstAmountRaw != null) { |
| 499 | final dstAmountMinimal = _stripN(dstAmountRaw); |
| 500 | receiveAmount = AmountConverter.fromBaseUnits(dstAmountMinimal, dstDecimals); |
| 501 | } |
| 502 | |
| 503 | final srcAmountMinimal = _stripN(srcAmountRaw); |
| 504 | final amount = AmountConverter.fromBaseUnits(srcAmountMinimal, srcDecimals); |
| 505 | final fromCurrency = CryptoCurrency.safeParseCurrencyFromString(fromSymbol); |
| 506 | |
| 507 | // Timestamps can be num or "123n" handle both |
| 508 | final srcTs = _parseUnixSeconds(srcTransaction?['timestamp']); |
| 509 | final dstTs = _parseUnixSeconds(dstTransaction?['timestamp']); |
| 510 | final timestamp = srcTs ?? dstTs; |
| 511 | |
| 512 | final createdAt = timestamp != null |
| 513 | ? DateTime.fromMillisecondsSinceEpoch(timestamp * 1000, isUtc: true).toLocal() |
| 514 | : null; |
| 515 | |
| 516 | return Trade( |
| 517 | id: (data['txId'] as String?) ?? id, |
| 518 | from: fromCurrency, |
| 519 | to: toCurrency, |
| 520 | provider: description, |
| 521 | inputAddress: inputAddress, |
| 522 | payoutAddress: payoutAddress, |
| 523 | amount: amount, |
| 524 | receiveAmount: receiveAmount, |
| 525 | txId: txHash, |
| 526 | state: state, |
| 527 | createdAt: createdAt, |
| 528 | refundAddress: refundAddress, |
| 529 | ); |
| 530 | } |
| 531 | |
| 532 | TradeState _mapSwapsStatusToTradeState(String s) { |
| 533 | switch (s) { |
| 534 | case 'pending': |
| 535 | case 'processing': |
| 536 | return TradeState.pending; |
| 537 | case 'success': |
| 538 | case 'completed': |
| 539 | case 'complete': |
| 540 | return TradeState.finished; |
| 541 | case 'failed': |
| 542 | case 'cancelled': |
| 543 | case 'canceled': |
| 544 | case 'error': |
| 545 | return TradeState.failed; |
| 546 | default: |
| 547 | return TradeState.pending; |
| 548 | } |
| 549 | } |
| 550 | |
| 551 | // Load & cache supported chains once |
| 552 | Future<List<Chain>> _geSupportedChain() async { |
| 553 | if (_supportedChainList.isNotEmpty) return _supportedChainList; |
| 554 | try { |
| 555 | final uri = Uri.https(_baseUrl, _getChainList); |
| 556 | final response = await ProxyWrapper().get(clearnetUri: uri, headers: _headers); |
| 557 | if (response.statusCode != 200) return []; |
| 558 | |
| 559 | final data = json.decode(response.body) as List<dynamic>; |
| 560 | _supportedChainList |
| 561 | ..clear() |
| 562 | ..addAll(data.map((e) => Chain.fromJson(e as Map<String, dynamic>))); |
| 563 | return _supportedChainList; |
| 564 | } catch (e) { |
| 565 | printV(e); |
| 566 | return []; |
| 567 | } |
| 568 | } |
| 569 | |
| 570 | Future<void> _ensureTokensCached({ |
| 571 | required Chain fromChain, |
| 572 | required Chain toChain, |
| 573 | required CryptoCurrency from, |
| 574 | required CryptoCurrency to, |
| 575 | }) async { |
| 576 | final needSrc = !_tokensCache.containsKey(fromChain.chainId) || |
| 577 | (_tokensCache[fromChain.chainId]?.isEmpty ?? true); |
| 578 | |
| 579 | final needDst = !_tokensCache.containsKey(toChain.chainId) || |
| 580 | (_tokensCache[toChain.chainId]?.isEmpty ?? true); |
| 581 | |
| 582 | if (!needSrc && !needDst) return; |
| 583 | |
| 584 | if (needSrc) { |
| 585 | await _fetchAndCacheTokens(srcChainId: fromChain.chainId); |
| 586 | } |
| 587 | if (needDst) { |
| 588 | await _fetchAndCacheTokens(srcChainId: toChain.chainId); |
| 589 | } |
| 590 | } |
| 591 | |
| 592 | // call getPaths and merge tokens into cache keyed by the chainId |
| 593 | Future<void> _fetchAndCacheTokens({ |
| 594 | required int srcChainId, |
| 595 | }) async { |
| 596 | final params = <String, String>{ |
| 597 | 'srcChainId': '$srcChainId', |
| 598 | 'srcToken': '0x0000000000000000000000000000000000000000', |
| 599 | // Native placeholder |
| 600 | }; |
| 601 | |
| 602 | final uri = Uri.https(_baseUrl, _getPaths, params); |
| 603 | final res = await ProxyWrapper().get(clearnetUri: uri, headers: _headers); |
| 604 | if (res.statusCode != 200) { |
| 605 | printV('getPaths failed: ${res.statusCode} ${res.body}'); |
| 606 | return; |
| 607 | } |
| 608 | |
| 609 | Map<String, dynamic> body; |
| 610 | try { |
| 611 | body = json.decode(res.body) as Map<String, dynamic>; |
| 612 | } catch (e) { |
| 613 | printV('getPaths JSON decode error: $e'); |
| 614 | return; |
| 615 | } |
| 616 | |
| 617 | // Always cache the source chain's native token (from body['srcToken']) |
| 618 | final srcTokenJson = body['srcToken'] as Map<String, dynamic>?; |
| 619 | if (srcTokenJson != null) { |
| 620 | final symbol = (srcTokenJson['symbol'] as String? ?? '').toUpperCase(); |
| 621 | if (symbol.isNotEmpty) { |
| 622 | final isNative = srcTokenJson['isNative'] == true; |
| 623 | final decimals = (srcTokenJson['decimals'] as num?)?.toInt(); |
| 624 | // Treat native token as address = null so _getTokenAddress() emits zero-address |
| 625 | final addr = isNative ? null : (srcTokenJson['address'] as String?); |
| 626 | _mergeCache(srcChainId, [ |
| 627 | TokenPathInfo( |
| 628 | symbol: symbol, |
| 629 | address: addr, |
| 630 | decimals: decimals, |
| 631 | minAmount: srcTokenJson['minAmount']?.toString(), |
| 632 | maxAmount: srcTokenJson['maxAmount']?.toString(), |
| 633 | ), |
| 634 | ]); |
| 635 | } |
| 636 | } |
| 637 | |
| 638 | final paths = (body['paths'] as List?) ?? const []; |
| 639 | if (paths.isEmpty) return; |
| 640 | |
| 641 | for (final path in paths) { |
| 642 | final map = path as Map<String, dynamic>; |
| 643 | final pathChainId = (map['chainId'] as num?)?.toInt(); |
| 644 | if (pathChainId == null) continue; |
| 645 | |
| 646 | final tokensField = map['tokens']; |
| 647 | |
| 648 | // Case 1: String "all" -> cache empty list to indicate all tokens supported |
| 649 | if (tokensField is String) { |
| 650 | if (tokensField.toLowerCase() == 'all') { |
| 651 | _tokensCache[pathChainId] = _tokensCache[pathChainId] ?? <TokenPathInfo>[]; |
| 652 | } |
| 653 | continue; |
| 654 | } |
| 655 | |
| 656 | // Case 2: List -> parse and merge |
| 657 | if (tokensField is List) { |
| 658 | final parsed = <TokenPathInfo>[]; |
| 659 | for (final token in tokensField) { |
| 660 | if (token is Map<String, dynamic>) { |
| 661 | try { |
| 662 | parsed.add(TokenPathInfo.fromJson(token)); |
| 663 | } catch (e) { |
| 664 | printV('Token parse error on chain $pathChainId: $e : $token'); |
| 665 | } |
| 666 | } |
| 667 | } |
| 668 | if (parsed.isNotEmpty) { |
| 669 | _mergeCache(pathChainId, parsed); |
| 670 | } |
| 671 | } |
| 672 | } |
| 673 | } |
| 674 | |
| 675 | // Merge by symbol, prefer entries that have a non-empty address/decimals |
| 676 | void _mergeCache(int chainId, List<TokenPathInfo> incoming) { |
| 677 | final existing = _tokensCache[chainId] ?? const <TokenPathInfo>[]; |
| 678 | final bySymbol = <String, TokenPathInfo>{for (final t in existing) t.symbol: t}; |
| 679 | |
| 680 | for (final t in incoming) { |
| 681 | final cur = bySymbol[t.symbol]; |
| 682 | if (cur == null) { |
| 683 | bySymbol[t.symbol] = t; |
| 684 | } else { |
| 685 | // If incoming has a real address/decimals, prefer it |
| 686 | final hasBetterAddr = (t.address != null && t.address!.isNotEmpty) && |
| 687 | (cur.address == null || cur.address!.isEmpty); |
| 688 | final hasBetterDec = (t.decimals != null) && (cur.decimals == null); |
| 689 | if (hasBetterAddr || hasBetterDec) { |
| 690 | bySymbol[t.symbol] = t; |
| 691 | } |
| 692 | } |
| 693 | } |
| 694 | |
| 695 | _tokensCache[chainId] = bySymbol.values.toList(); |
| 696 | } |
| 697 | |
| 698 | String _normalizeCakeNativeTokenName(String title) { |
| 699 | final name = title.toUpperCase(); |
| 700 | return switch (name) { |
| 701 | 'ZZEC' => 'ZEC', |
| 702 | _ => name, |
| 703 | }; |
| 704 | } |
| 705 | |
| 706 | String _getTokenAddress({ |
| 707 | required CryptoCurrency currency, |
| 708 | required Chain chain, |
| 709 | }) { |
| 710 | final symbol = _normalizeCakeNativeTokenName(currency.title); |
| 711 | final list = _tokensCache[chain.chainId]; |
| 712 | |
| 713 | // Try cache hit |
| 714 | if (list != null && list.isNotEmpty) { |
| 715 | for (final t in list) { |
| 716 | if (t.symbol == symbol && t.address != null && t.address!.isNotEmpty) { |
| 717 | return t.address!; |
| 718 | } else if (t.symbol == symbol && (t.address == null)) { |
| 719 | // Native token on this chain |
| 720 | return '0x0000000000000000000000000000000000000000'; |
| 721 | } |
| 722 | } |
| 723 | } |
| 724 | |
| 725 | // May fail for non-native Alt-VM assets |
| 726 | return symbol; |
| 727 | } |
| 728 | |
| 729 | Map<String, dynamic>? findTokenBySymbol({required String title, required List<dynamic> tokens}) { |
| 730 | final reqSymbol = title.toUpperCase(); |
| 731 | for (final token in tokens) { |
| 732 | final map = token as Map<String, dynamic>; |
| 733 | final symbol = (map['symbol'] as String?)?.toUpperCase(); |
| 734 | if (symbol == reqSymbol) return map; |
| 735 | } |
| 736 | return null; |
| 737 | } |
| 738 | |
| 739 | Chain _findChainByCurrency(CryptoCurrency cur, List<Chain> chains) { |
| 740 | final network = _normalizeCakeNetwork(cur.tag ?? cur.title); |
| 741 | return chains.firstWhere( |
| 742 | (c) { |
| 743 | return c.name.toUpperCase() == network; |
| 744 | }, |
| 745 | orElse: () => throw Exception('Unsupported chain for ${cur.title}'), |
| 746 | ); |
| 747 | } |
| 748 | |
| 749 | String _normalizeCakeNetwork(String network) { |
| 750 | return switch (network.toUpperCase()) { |
| 751 | 'ETH' => 'ETHEREUM', |
| 752 | 'BSC' => 'BNB SMART CHAIN', |
| 753 | 'POL' => 'POLYGON', |
| 754 | 'AVAXC' => 'AVALANCHE', |
| 755 | 'TRX' => 'TRON', |
| 756 | 'SOL' => 'SOLANA', |
| 757 | 'CRO' => 'CRONOS', |
| 758 | 'ADA' => 'CARDANO', |
| 759 | 'KAS' => 'KASPA', |
| 760 | 'TON' => 'TONCOIN', |
| 761 | 'BCH' => 'BITCOIN CASH', |
| 762 | 'ARB' => 'ARBITRUM', |
| 763 | _ => network.toUpperCase(), |
| 764 | }; |
| 765 | } |
| 766 | |
| 767 | int? _parseUnixSeconds(dynamic value) { |
| 768 | if (value == null) return null; |
| 769 | if (value is num) return value.toInt(); |
| 770 | if (value is String) { |
| 771 | final clean = _stripN(value); |
| 772 | return int.tryParse(clean); |
| 773 | } |
| 774 | return null; |
| 775 | } |
| 776 | |
| 777 | String _stripN(String? str) { |
| 778 | final s = str ?? '0'; |
| 779 | return s.endsWith('n') ? s.substring(0, s.length - 1) : s; |
| 780 | } |
| 781 | |
| 782 | String _decodeMethodSelector(String s) => |
| 783 | (s.startsWith('0x') && s.length >= 10) ? s.substring(0, 10) : ''; |
| 784 | } |
| 785 | |
| 786 | class TokenPathInfo { |
| 787 | final String symbol; |
| 788 | final String? address; |
| 789 | final int? decimals; |
| 790 | final String? minAmount; |
| 791 | final String? maxAmount; |
| 792 | |
| 793 | TokenPathInfo({ |
| 794 | required this.symbol, |
| 795 | required this.address, |
| 796 | required this.decimals, |
| 797 | required this.minAmount, |
| 798 | required this.maxAmount, |
| 799 | }); |
| 800 | |
| 801 | factory TokenPathInfo.fromJson(Map<String, dynamic> json) => TokenPathInfo( |
| 802 | symbol: (json['symbol'] as String?)?.toUpperCase() ?? '', |
| 803 | address: json['address'] as String?, |
| 804 | decimals: json['decimals'] as int?, |
| 805 | minAmount: json['minAmount']?.toString(), |
| 806 | maxAmount: json['maxAmount']?.toString(), |
| 807 | ); |
| 808 | } |
| 809 | |
| 810 | class Chain { |
| 811 | final int chainId; |
| 812 | final String name; |
| 813 | final String vmId; |
| 814 | |
| 815 | Chain({ |
| 816 | required this.chainId, |
| 817 | required this.name, |
| 818 | required this.vmId, |
| 819 | }); |
| 820 | |
| 821 | factory Chain.fromJson(Map<String, dynamic> json) { |
| 822 | return Chain( |
| 823 | chainId: json['chainId'] as int, |
| 824 | name: json['name'] as String, |
| 825 | vmId: json['vmId'] as String, |
| 826 | ); |
| 827 | } |
| 828 | } |
| 829 | |
| 830 | class _PathInfo { |
| 831 | final bool supportsExactOut; |
| 832 | final String minToAmountHuman; |
| 833 | |
| 834 | _PathInfo({required this.supportsExactOut, required this.minToAmountHuman}); |
| 835 | } |