| 1 | import 'dart:convert'; |
| 2 | import 'dart:developer'; |
| 3 | |
| 4 | import 'package:cake_wallet/buy/buy_provider.dart'; |
| 5 | import 'package:cake_wallet/buy/buy_quote.dart'; |
| 6 | import 'package:cake_wallet/buy/pairs_utils.dart'; |
| 7 | import 'package:cake_wallet/buy/payment_method.dart'; |
| 8 | import 'package:cake_wallet/entities/fiat_currency.dart'; |
| 9 | import 'package:cake_wallet/generated/i18n.dart'; |
| 10 | import 'package:cake_wallet/routes.dart'; |
| 11 | import 'package:cake_wallet/src/screens/connect_device/connect_device_page.dart'; |
| 12 | import 'package:cake_wallet/src/widgets/alert_with_one_action.dart'; |
| 13 | import 'package:cake_wallet/view_model/hardware_wallet/hardware_wallet_view_model.dart'; |
| 14 | import 'package:cake_wallet/utils/show_pop_up.dart'; |
| 15 | import 'package:cw_core/crypto_currency.dart'; |
| 16 | import 'package:cw_core/utils/print_verbose.dart'; |
| 17 | import 'package:cw_core/utils/proxy_wrapper.dart'; |
| 18 | import 'package:cw_core/wallet_base.dart'; |
| 19 | import 'package:cw_core/wallet_type.dart'; |
| 20 | import 'package:flutter/material.dart'; |
| 21 | import 'package:url_launcher/url_launcher.dart'; |
| 22 | |
| 23 | class DFXBuyProvider extends BuyProvider { |
| 24 | DFXBuyProvider({ |
| 25 | required WalletBase wallet, |
| 26 | bool isTestEnvironment = false, |
| 27 | HardwareWalletViewModel? hardwareWalletVM, |
| 28 | }) : super( |
| 29 | wallet: wallet, |
| 30 | isTestEnvironment: isTestEnvironment, |
| 31 | hardwareWalletVM: hardwareWalletVM, |
| 32 | supportedCryptoList: supportedCryptoToFiatPairs( |
| 33 | notSupportedCrypto: _notSupportedCrypto, notSupportedFiat: _notSupportedFiat), |
| 34 | supportedFiatList: supportedFiatToCryptoPairs( |
| 35 | notSupportedFiat: _notSupportedFiat, notSupportedCrypto: _notSupportedCrypto), |
| 36 | ); |
| 37 | |
| 38 | static const _baseUrl = 'api.dfx.swiss'; |
| 39 | |
| 40 | // static const _signMessagePath = '/v1/auth/signMessage'; |
| 41 | static const _authPath = '/v1/auth'; |
| 42 | static const walletName = 'CakeWallet'; |
| 43 | |
| 44 | static final List<CryptoCurrency> _supportedCrypto = [ |
| 45 | CryptoCurrency.xmr, |
| 46 | CryptoCurrency.btc, |
| 47 | CryptoCurrency.eth, |
| 48 | CryptoCurrency.maticpoly, |
| 49 | CryptoCurrency.sol, |
| 50 | CryptoCurrency.zano, |
| 51 | CryptoCurrency.trx, |
| 52 | ]; |
| 53 | static final List<CryptoCurrency> _notSupportedCrypto = CryptoCurrency.all |
| 54 | .where((crypto) => !_supportedCrypto.contains(crypto) || ["ETH", "POL"].contains(crypto.tag)) |
| 55 | .toList(); |
| 56 | |
| 57 | static final List<FiatCurrency> _supportedFiat = [FiatCurrency.chf, FiatCurrency.eur]; |
| 58 | static final List<FiatCurrency> _notSupportedFiat = |
| 59 | FiatCurrency.all.where((fiat) => !_supportedFiat.contains(fiat)).toList(); |
| 60 | |
| 61 | @override |
| 62 | String get title => 'DFX.swiss'; |
| 63 | |
| 64 | @override |
| 65 | String get providerDescription => S.current.dfx_option_description; |
| 66 | |
| 67 | @override |
| 68 | String get lightIcon => 'assets/images/dfx_light.png'; |
| 69 | |
| 70 | @override |
| 71 | String get darkIcon => 'assets/images/dfx_dark.png'; |
| 72 | |
| 73 | @override |
| 74 | bool get isAggregator => false; |
| 75 | |
| 76 | String get blockchain { |
| 77 | switch (wallet.type) { |
| 78 | case WalletType.bitcoin: |
| 79 | return 'Bitcoin'; |
| 80 | case WalletType.zano: |
| 81 | return 'Zano'; |
| 82 | default: |
| 83 | return walletTypeToString(wallet.type); |
| 84 | } |
| 85 | } |
| 86 | |
| 87 | Future<String> getSignMessage(String walletAddress) async => |
| 88 | "By_signing_this_message,_you_confirm_that_you_are_the_sole_owner_of_the_provided_Blockchain_address._Your_ID:_$walletAddress"; |
| 89 | |
| 90 | // Lets keep this just in case, but we can avoid this API Call |
| 91 | // Future<String> getSignMessage() async { |
| 92 | // final uri = Uri.https(_baseUrl, _signMessagePath, {'address': walletAddress}); |
| 93 | // |
| 94 | // final response = await http.get(uri, headers: {'accept': 'application/json'}); |
| 95 | // |
| 96 | // if (response.statusCode == 200) { |
| 97 | // final responseBody = jsonDecode(response.body); |
| 98 | // return responseBody['message'] as String; |
| 99 | // } else { |
| 100 | // throw Exception( |
| 101 | // 'Failed to get sign message. Status: ${response.statusCode} ${response.body}'); |
| 102 | // } |
| 103 | // } |
| 104 | |
| 105 | Future<String> auth(String walletAddress) async { |
| 106 | final signMessage = await getSignature(await getSignMessage(walletAddress), walletAddress); |
| 107 | |
| 108 | final requestBody = jsonEncode({ |
| 109 | 'wallet': walletName, |
| 110 | 'address': walletAddress, |
| 111 | 'signature': signMessage, |
| 112 | }); |
| 113 | |
| 114 | final uri = Uri.https(_baseUrl, _authPath); |
| 115 | final response = await ProxyWrapper().post( |
| 116 | clearnetUri: uri, |
| 117 | headers: {'Content-Type': 'application/json'}, |
| 118 | body: requestBody, |
| 119 | ); |
| 120 | |
| 121 | if (response.statusCode == 201) { |
| 122 | final responseBody = jsonDecode(response.body); |
| 123 | return responseBody['accessToken'] as String; |
| 124 | } else if (response.statusCode == 403) { |
| 125 | final responseBody = jsonDecode(response.body); |
| 126 | final message = responseBody['message'] ?? 'Service unavailable in your country'; |
| 127 | throw Exception(message); |
| 128 | } else { |
| 129 | throw Exception('Failed to sign up. ${_getErrorMessage(response.statusCode, response.body)}'); |
| 130 | } |
| 131 | } |
| 132 | |
| 133 | Future<String> getSignature(String message, String walletAddress) async { |
| 134 | switch (wallet.type) { |
| 135 | case WalletType.ethereum: |
| 136 | case WalletType.polygon: |
| 137 | case WalletType.base: |
| 138 | case WalletType.arbitrum: |
| 139 | case WalletType.bsc: |
| 140 | case WalletType.solana: |
| 141 | case WalletType.tron: |
| 142 | return wallet.signMessage(message); |
| 143 | case WalletType.monero: |
| 144 | case WalletType.litecoin: |
| 145 | case WalletType.bitcoin: |
| 146 | case WalletType.bitcoinCash: |
| 147 | case WalletType.zano: |
| 148 | return wallet.signMessage(message, address: walletAddress); |
| 149 | default: |
| 150 | throw Exception("WalletType is not available for DFX ${wallet.type}"); |
| 151 | } |
| 152 | } |
| 153 | |
| 154 | Future<Map<String, dynamic>> fetchFiatCredentials(String fiatCurrency) async { |
| 155 | final url = Uri.https(_baseUrl, '/v1/fiat'); |
| 156 | |
| 157 | try { |
| 158 | final response = |
| 159 | await ProxyWrapper().get(clearnetUri: url, headers: {'accept': 'application/json'}); |
| 160 | |
| 161 | if (response.statusCode == 200) { |
| 162 | final data = jsonDecode(response.body) as List<dynamic>; |
| 163 | for (final item in data) { |
| 164 | if (item['name'] == fiatCurrency) return item as Map<String, dynamic>; |
| 165 | } |
| 166 | log('DFX does not support fiat: $fiatCurrency'); |
| 167 | return {}; |
| 168 | } else { |
| 169 | log('DFX Failed to fetch fiat currencies: ${response.statusCode}'); |
| 170 | return {}; |
| 171 | } |
| 172 | } catch (e) { |
| 173 | printV('DFX Error fetching fiat currencies: $e'); |
| 174 | return {}; |
| 175 | } |
| 176 | } |
| 177 | |
| 178 | Future<Map<String, dynamic>> fetchAssetCredential(String assetsName) async { |
| 179 | final url = Uri.https(_baseUrl, '/v1/asset', {'blockchains': blockchain}); |
| 180 | |
| 181 | try { |
| 182 | final response = |
| 183 | await ProxyWrapper().get(clearnetUri: url, headers: {'accept': 'application/json'}); |
| 184 | |
| 185 | if (response.statusCode == 200) { |
| 186 | final responseData = jsonDecode(response.body); |
| 187 | |
| 188 | if (responseData is List && responseData.isNotEmpty) { |
| 189 | for (final i in responseData) { |
| 190 | if (assetsName.toLowerCase() == i["dexName"].toString().toLowerCase()) { |
| 191 | return i as Map<String, dynamic>; |
| 192 | } |
| 193 | } |
| 194 | return responseData.first as Map<String, dynamic>; |
| 195 | } else if (responseData is Map<String, dynamic>) { |
| 196 | return responseData; |
| 197 | } else { |
| 198 | log('DFX: Does not support this asset name : ${blockchain}'); |
| 199 | } |
| 200 | } else { |
| 201 | log('DFX: Failed to fetch assets: ${response.statusCode}'); |
| 202 | } |
| 203 | } catch (e) { |
| 204 | log('DFX: Error fetching assets: $e'); |
| 205 | } |
| 206 | return {}; |
| 207 | } |
| 208 | |
| 209 | Future<List<PaymentMethod>> getAvailablePaymentTypes( |
| 210 | String fiatCurrency, CryptoCurrency cryptoCurrency, bool isBuyAction) async { |
| 211 | final List<PaymentMethod> paymentMethods = []; |
| 212 | |
| 213 | if (isBuyAction) { |
| 214 | final fiatBuyCredentials = await fetchFiatCredentials(fiatCurrency); |
| 215 | if (fiatBuyCredentials.isNotEmpty) { |
| 216 | fiatBuyCredentials.forEach((key, value) { |
| 217 | if (key == 'limits') { |
| 218 | final limits = value as Map<String, dynamic>; |
| 219 | limits.forEach((paymentMethodKey, paymentMethodValue) { |
| 220 | final min = _toDouble(paymentMethodValue['minVolume']); |
| 221 | final max = _toDouble(paymentMethodValue['maxVolume']); |
| 222 | if (min != null && max != null && min > 0 && max > 0) { |
| 223 | final paymentMethod = PaymentMethod.fromDFX( |
| 224 | paymentMethodKey, _getPaymentTypeByString(paymentMethodKey)); |
| 225 | paymentMethods.add(paymentMethod); |
| 226 | } |
| 227 | }); |
| 228 | } |
| 229 | }); |
| 230 | } |
| 231 | } else { |
| 232 | final assetCredentials = await fetchAssetCredential(cryptoCurrency.title); |
| 233 | if (assetCredentials.isNotEmpty) { |
| 234 | if (assetCredentials['sellable'] == true) { |
| 235 | final availablePaymentTypes = [ |
| 236 | PaymentType.bankTransfer, |
| 237 | PaymentType.creditCard, |
| 238 | PaymentType.sepa |
| 239 | ]; |
| 240 | availablePaymentTypes.forEach((element) { |
| 241 | final paymentMethod = PaymentMethod.fromDFX(normalizePaymentMethod(element)!, element); |
| 242 | paymentMethods.add(paymentMethod); |
| 243 | }); |
| 244 | } |
| 245 | } |
| 246 | } |
| 247 | |
| 248 | return paymentMethods; |
| 249 | } |
| 250 | |
| 251 | @override |
| 252 | Future<List<Quote>?> fetchQuote( |
| 253 | {required CryptoCurrency cryptoCurrency, |
| 254 | required FiatCurrency fiatCurrency, |
| 255 | required double amount, |
| 256 | required bool isBuyAction, |
| 257 | required String walletAddress, |
| 258 | PaymentType? paymentType, |
| 259 | String? customPaymentMethodType, |
| 260 | String? countryCode}) async { |
| 261 | /// if buying with any currency other than eur or chf then DFX is not supported |
| 262 | |
| 263 | if (isBuyAction && (fiatCurrency != FiatCurrency.eur && fiatCurrency != FiatCurrency.chf)) { |
| 264 | return null; |
| 265 | } |
| 266 | |
| 267 | String? paymentMethod; |
| 268 | if (paymentType != null && paymentType != PaymentType.all) { |
| 269 | paymentMethod = normalizePaymentMethod(paymentType); |
| 270 | if (paymentMethod == null) paymentMethod = paymentType.name; |
| 271 | } else { |
| 272 | paymentMethod = 'Bank'; |
| 273 | } |
| 274 | |
| 275 | final action = isBuyAction ? 'buy' : 'sell'; |
| 276 | |
| 277 | final fiatCredentials = await fetchFiatCredentials(fiatCurrency.name.toString()); |
| 278 | if (fiatCredentials['id'] == null) return null; |
| 279 | |
| 280 | final assetCredentials = await fetchAssetCredential(cryptoCurrency.title.toString()); |
| 281 | if (assetCredentials['id'] == null) return null; |
| 282 | |
| 283 | log('DFX: Fetching $action quote: ${isBuyAction ? cryptoCurrency : fiatCurrency} -> ${isBuyAction ? fiatCurrency : cryptoCurrency}, amount: $amount, paymentMethod: $paymentMethod'); |
| 284 | |
| 285 | final url = Uri.https(_baseUrl, '/v1/$action/quote'); |
| 286 | final headers = {'accept': 'application/json', 'Content-Type': 'application/json'}; |
| 287 | final body = jsonEncode({ |
| 288 | 'currency': {'id': fiatCredentials['id'] as int}, |
| 289 | 'asset': {'id': assetCredentials['id']}, |
| 290 | 'amount': amount, |
| 291 | 'targetAmount': 0, |
| 292 | 'paymentMethod': paymentMethod, |
| 293 | 'discountCode': '' |
| 294 | }); |
| 295 | |
| 296 | try { |
| 297 | final response = await ProxyWrapper().put( |
| 298 | clearnetUri: url, |
| 299 | headers: headers, |
| 300 | body: body, |
| 301 | ); |
| 302 | |
| 303 | final responseData = jsonDecode(response.body); |
| 304 | |
| 305 | if (response.statusCode == 200) { |
| 306 | if (responseData is Map<String, dynamic>) { |
| 307 | final paymentType = _getPaymentTypeByString(responseData['paymentMethod'] as String?); |
| 308 | final quote = Quote.fromDFXJson(responseData, isBuyAction, paymentType); |
| 309 | quote.setFiatCurrency = fiatCurrency; |
| 310 | quote.setCryptoCurrency = cryptoCurrency; |
| 311 | return [quote]; |
| 312 | } else { |
| 313 | printV('DFX: Unexpected data type: ${responseData.runtimeType}'); |
| 314 | return null; |
| 315 | } |
| 316 | } else { |
| 317 | if (responseData is Map<String, dynamic> && responseData.containsKey('message')) { |
| 318 | printV('DFX Error: ${responseData['message']}'); |
| 319 | } else { |
| 320 | printV('DFX Failed to fetch buy quote: ${response.statusCode}'); |
| 321 | } |
| 322 | return null; |
| 323 | } |
| 324 | } catch (e) { |
| 325 | printV('DFX Error fetching buy quote: $e'); |
| 326 | return null; |
| 327 | } |
| 328 | } |
| 329 | |
| 330 | Future<void>? launchProvider( |
| 331 | {required BuildContext context, |
| 332 | required Quote quote, |
| 333 | required double amount, |
| 334 | required bool isBuyAction, |
| 335 | required String cryptoCurrencyAddress, |
| 336 | String? countryCode}) async { |
| 337 | if (wallet.isHardwareWallet) { |
| 338 | if (!hardwareWalletVM!.isConnected(wallet.walletInfo.type)) { |
| 339 | await Navigator.of(context).pushNamed( |
| 340 | Routes.connectDevices, |
| 341 | arguments: ConnectDevicePageParams( |
| 342 | walletType: wallet.walletInfo.type, |
| 343 | hardwareWalletType: wallet.walletInfo.hardwareWalletType!, |
| 344 | onConnectDevice: (context, hwwVM) { |
| 345 | hwwVM.initWallet(wallet); |
| 346 | Navigator.of(context).pop(); |
| 347 | }, |
| 348 | isReconnect: false, |
| 349 | ), |
| 350 | ); |
| 351 | |
| 352 | // Recheck to handle tap-backs |
| 353 | if (!hardwareWalletVM!.isConnected(wallet.walletInfo.type)) { |
| 354 | return; |
| 355 | } |
| 356 | } else { |
| 357 | hardwareWalletVM!.initWallet(wallet); |
| 358 | } |
| 359 | } |
| 360 | |
| 361 | try { |
| 362 | final actionType = isBuyAction ? '/buy' : '/sell'; |
| 363 | |
| 364 | final accessToken = await auth(cryptoCurrencyAddress); |
| 365 | |
| 366 | final uri = Uri.https('app.dfx.swiss', actionType, { |
| 367 | 'session': accessToken, |
| 368 | 'lang': 'en', |
| 369 | 'asset-out': isBuyAction ? quote.cryptoCurrency.toString() : quote.fiatCurrency.toString(), |
| 370 | 'blockchain': blockchain, |
| 371 | 'asset-in': isBuyAction ? quote.fiatCurrency.toString() : quote.cryptoCurrency.toString(), |
| 372 | 'amount-in': amount.toString() |
| 373 | }); |
| 374 | |
| 375 | if (await canLaunchUrl(uri)) { |
| 376 | await launchUrl(uri, mode: LaunchMode.externalApplication); |
| 377 | } else { |
| 378 | throw Exception('Could not launch URL'); |
| 379 | } |
| 380 | } catch (e) { |
| 381 | await showPopUp<void>( |
| 382 | context: context, |
| 383 | builder: (context) => AlertWithOneAction( |
| 384 | alertTitle: "DFX.swiss", |
| 385 | alertContent: '${S.of(context).buy_provider_unavailable}: $e', |
| 386 | buttonText: S.of(context).ok, |
| 387 | buttonAction: () => Navigator.of(context).pop()), |
| 388 | ); |
| 389 | } |
| 390 | } |
| 391 | |
| 392 | String? normalizePaymentMethod(PaymentType paymentMethod) { |
| 393 | switch (paymentMethod) { |
| 394 | case PaymentType.bankTransfer: |
| 395 | return 'Bank'; |
| 396 | case PaymentType.creditCard: |
| 397 | return 'Card'; |
| 398 | case PaymentType.sepa: |
| 399 | return 'Instant'; |
| 400 | default: |
| 401 | return null; |
| 402 | } |
| 403 | } |
| 404 | |
| 405 | PaymentType _getPaymentTypeByString(String? paymentMethod) { |
| 406 | switch (paymentMethod) { |
| 407 | case 'Bank': |
| 408 | return PaymentType.bankTransfer; |
| 409 | case 'Card': |
| 410 | return PaymentType.creditCard; |
| 411 | case 'Instant': |
| 412 | return PaymentType.sepa; |
| 413 | default: |
| 414 | return PaymentType.unknown; |
| 415 | } |
| 416 | } |
| 417 | |
| 418 | double? _toDouble(dynamic value) { |
| 419 | if (value is int) { |
| 420 | return value.toDouble(); |
| 421 | } else if (value is double) { |
| 422 | return value; |
| 423 | } |
| 424 | return null; |
| 425 | } |
| 426 | |
| 427 | String _getErrorMessage(int statusCode, String body) { |
| 428 | final responseBody = jsonDecode(body) as Map<String, dynamic>; |
| 429 | final message = responseBody['message']?.toString() ?? ''; |
| 430 | |
| 431 | if (message.contains("address must match") || message.contains("signature must match")) { |
| 432 | return "The wallet type must match the selected currency"; |
| 433 | } |
| 434 | |
| 435 | return message.isNotEmpty ? message : "Unknown error: ${statusCode}"; |
| 436 | } |
| 437 | } |