import 'dart:typed_data'; import 'package:bech32/bech32.dart'; import 'package:bitbox/bitbox.dart' as bitbox; import 'package:bs58check/bs58check.dart' as bs58check; import 'package:coinlib_flutter/coinlib_flutter.dart' as coinlib; import 'package:stackwallet/models/isar/models/blockchain_data/address.dart'; import 'package:stackwallet/utilities/amount/amount.dart'; import 'package:stackwallet/utilities/enums/coin_enum.dart'; import 'package:stackwallet/utilities/enums/derive_path_type_enum.dart'; import 'package:stackwallet/wallets/crypto_currency/crypto_currency.dart'; import 'package:stackwallet/wallets/crypto_currency/intermediate/bip39_hd_currency.dart'; class Bitcoincash extends Bip39HDCurrency { Bitcoincash(super.network) { switch (network) { case CryptoCurrencyNetwork.main: coin = Coin.bitcoincash; case CryptoCurrencyNetwork.test: coin = Coin.bitcoincashTestnet; default: throw Exception("Unsupported network: $network"); } } @override int get maxUnusedAddressGap => 50; @override int get maxNumberOfIndexesToCheck => 10000000; @override List get supportedDerivationPathTypes => [ DerivePathType.bip44, if (coin != Coin.bitcoincashTestnet) DerivePathType.bch44, ]; @override String get genesisHash { switch (network) { case CryptoCurrencyNetwork.main: return "000000000019d6689c085ae165831e934ff763ae46a2a6c172b3f1b60a8ce26f"; case CryptoCurrencyNetwork.test: return "000000000933ea01ad0ee984209779baaec3ced90fa3f408719526f8d77f4943"; default: throw Exception("Unsupported network: $network"); } } @override Amount get dustLimit => Amount( rawValue: BigInt.from(546), fractionDigits: fractionDigits, ); @override coinlib.NetworkParams get networkParams { switch (network) { case CryptoCurrencyNetwork.main: return const coinlib.NetworkParams( wifPrefix: 0x80, p2pkhPrefix: 0x00, p2shPrefix: 0x05, privHDPrefix: 0x0488ade4, pubHDPrefix: 0x0488b21e, bech32Hrp: "bc", messagePrefix: '\x18Bitcoin Signed Message:\n', ); case CryptoCurrencyNetwork.test: return const coinlib.NetworkParams( wifPrefix: 0xef, p2pkhPrefix: 0x6f, p2shPrefix: 0xc4, privHDPrefix: 0x04358394, pubHDPrefix: 0x043587cf, bech32Hrp: "tb", messagePrefix: "\x18Bitcoin Signed Message:\n", ); default: throw Exception("Unsupported network: $network"); } } @override String constructDerivePath({ required DerivePathType derivePathType, int account = 0, required int chain, required int index, }) { String coinType; switch (networkParams.wifPrefix) { case 0x80: switch (derivePathType) { case DerivePathType.bip44: coinType = "145"; // bch mainnet break; case DerivePathType.bch44: // bitcoin.com wallet specific coinType = "0"; // bch mainnet break; default: throw Exception( "DerivePathType $derivePathType not supported for coinType"); } break; case 0xef: coinType = "1"; // btc testnet break; default: throw Exception("Invalid Bitcoin network wif used!"); } final int purpose; switch (derivePathType) { case DerivePathType.bip44: case DerivePathType.bch44: purpose = 44; break; default: throw Exception("DerivePathType $derivePathType not supported"); } return "m/$purpose'/$coinType'/$account'/$chain/$index"; } @override ({coinlib.Address address, AddressType addressType}) getAddressForPublicKey({ required coinlib.ECPublicKey publicKey, required DerivePathType derivePathType, }) { switch (derivePathType) { case DerivePathType.bip44: case DerivePathType.bch44: final addr = coinlib.P2PKHAddress.fromPublicKey( publicKey, version: networkParams.p2pkhPrefix, ); return (address: addr, addressType: AddressType.p2pkh); default: throw Exception("DerivePathType $derivePathType not supported"); } } @override // change this to change the number of confirms a tx needs in order to show as confirmed int get minConfirms => 0; // bch zeroconf // TODO: [prio=med] bch p2sh addresses (complaints regarding sending to) @override bool validateAddress(String address) { try { // 0 for bitcoincash: address scheme, 1 for legacy address final format = bitbox.Address.detectFormat(address); if (coin == Coin.bitcoincashTestnet) { return true; } if (format == bitbox.Address.formatCashAddr) { return _validateCashAddr(address); } else { return address.startsWith("1"); } } catch (e) { return false; } } bool _validateCashAddr(String cashAddr) { String addr = cashAddr; if (cashAddr.contains(":")) { addr = cashAddr.split(":").last; } return addr.startsWith("q"); } // TODO: [prio=med] bch p2sh addresses? @override DerivePathType addressType({required String address}) { Uint8List? decodeBase58; Segwit? decodeBech32; try { if (bitbox.Address.detectFormat(address) == bitbox.Address.formatCashAddr) { if (_validateCashAddr(address)) { address = bitbox.Address.toLegacyAddress(address); } else { throw ArgumentError('$address is not currently supported'); } } } catch (_) { // invalid cash addr format } try { decodeBase58 = bs58check.decode(address); } catch (err) { // Base58check decode fail } if (decodeBase58 != null) { if (decodeBase58[0] == networkParams.p2pkhPrefix) { // P2PKH return DerivePathType.bip44; } if (decodeBase58[0] == networkParams.p2shPrefix) { // P2SH return DerivePathType.bip49; } throw ArgumentError('Invalid version or Network mismatch'); } else { try { decodeBech32 = segwit.decode(address); } catch (err) { // Bech32 decode fail } if (decodeBech32 != null) { if (networkParams.bech32Hrp != decodeBech32.hrp) { throw ArgumentError('Invalid prefix or Network mismatch'); } if (decodeBech32.version != 0) { throw ArgumentError('Invalid address version'); } } } throw ArgumentError('$address has no matching Script'); } }