cake_wallet/cw_bitcoin/lib/bitcoin_hardware_wallet_service.dart

import 'dart:async';

import 'package:bitcoin_base/bitcoin_base.dart';
import 'package:blockchain_utils/blockchain_utils.dart';
import 'package:cw_core/hardware/hardware_account_data.dart';
import 'package:ledger_bitcoin/ledger_bitcoin.dart';
import 'package:ledger_flutter_plus/ledger_flutter_plus.dart';

class BitcoinHardwareWalletService {
  BitcoinHardwareWalletService(this.ledgerConnection);

  final LedgerConnection ledgerConnection;

  Future<List<HardwareAccountData>> getAvailableAccounts({int index = 0, int limit = 5}) async {
    final bitcoinLedgerApp = BitcoinLedgerApp(ledgerConnection);

    final masterFp = await bitcoinLedgerApp.getMasterFingerprint();

    final accounts = <HardwareAccountData>[];
    final indexRange = List.generate(limit, (i) => i + index);

    for (final i in indexRange) {
      final derivationPath = "m/84'/0'/$i'";
      final xpub = await bitcoinLedgerApp.getXPubKey(derivationPath: derivationPath);
      final bip32 = Bip32Slip10Secp256k1.fromExtendedKey(xpub).childKey(Bip32KeyIndex(0));

      final fullPath = Bip32PathParser.parse(derivationPath).addElem(Bip32KeyIndex(0));

      final address = ECPublic.fromBip32(bip32.derive(fullPath).publicKey)
          .toP2wpkhAddress()
          .toAddress(BitcoinNetwork.mainnet);

      accounts.add(HardwareAccountData(
        address: address,
        accountIndex: i,
        derivationPath: derivationPath,
        masterFingerprint: masterFp,
        xpub: xpub,
      ));
    }

    return accounts;
  }
}