cake_wallet/cw_bitcoin/lib/bitcoin_wallet.dart

import 'dart:convert';

import 'package:bip39/bip39.dart' as bip39;
import 'package:bitcoin_base/bitcoin_base.dart';
import 'package:blockchain_utils/blockchain_utils.dart';
import 'package:cw_bitcoin/bitcoin_address_record.dart';
import 'package:cw_bitcoin/bitcoin_mnemonic.dart';
import 'package:cw_bitcoin/bitcoin_wallet_addresses.dart';
import 'package:cw_bitcoin/electrum_balance.dart';
import 'package:cw_bitcoin/electrum_derivations.dart';
import 'package:cw_bitcoin/electrum_wallet.dart';
import 'package:cw_bitcoin/electrum_wallet_snapshot.dart';
import 'package:cw_bitcoin/psbt_transaction_builder.dart';
import 'package:cw_core/crypto_currency.dart';
import 'package:cw_core/unspent_coins_info.dart';
import 'package:cw_core/wallet_info.dart';
import 'package:cw_core/wallet_keys_file.dart';
import 'package:flutter/foundation.dart';
import 'package:hive/hive.dart';
import 'package:ledger_bitcoin/ledger_bitcoin.dart';
import 'package:ledger_flutter/ledger_flutter.dart';
import 'package:mobx/mobx.dart';

part 'bitcoin_wallet.g.dart';

class BitcoinWallet = BitcoinWalletBase with _$BitcoinWallet;

abstract class BitcoinWalletBase extends ElectrumWallet with Store {
  BitcoinWalletBase({
    required String password,
    required WalletInfo walletInfo,
    required Box<UnspentCoinsInfo> unspentCoinsInfo,
    Uint8List? seedBytes,
    String? mnemonic,
    String? xpub,
    String? addressPageType,
    BasedUtxoNetwork? networkParam,
    List<BitcoinAddressRecord>? initialAddresses,
    ElectrumBalance? initialBalance,
    Map<String, int>? initialRegularAddressIndex,
    Map<String, int>? initialChangeAddressIndex,
    String? passphrase,
    List<BitcoinSilentPaymentAddressRecord>? initialSilentAddresses,
    int initialSilentAddressIndex = 0,
    bool? alwaysScan,
  }) : super(
          mnemonic: mnemonic,
          passphrase: passphrase,
          xpub: xpub,
          password: password,
          walletInfo: walletInfo,
          unspentCoinsInfo: unspentCoinsInfo,
          network: networkParam == null
              ? BitcoinNetwork.mainnet
              : networkParam == BitcoinNetwork.mainnet
                  ? BitcoinNetwork.mainnet
                  : BitcoinNetwork.testnet,
          initialAddresses: initialAddresses,
          initialBalance: initialBalance,
          seedBytes: seedBytes,
          currency:
              networkParam == BitcoinNetwork.testnet ? CryptoCurrency.tbtc : CryptoCurrency.btc,
          alwaysScan: alwaysScan,
        ) {
    // in a standard BIP44 wallet, mainHd derivation path = m/84'/0'/0'/0 (account 0, index unspecified here)
    // the sideHd derivation path = m/84'/0'/0'/1 (account 1, index unspecified here)
    // String derivationPath = walletInfo.derivationInfo!.derivationPath!;
    // String sideDerivationPath = derivationPath.substring(0, derivationPath.length - 1) + "1";
    // final hd = bitcoin.HDWallet.fromSeed(seedBytes, network: networkType);
    walletAddresses = BitcoinWalletAddresses(
      walletInfo,
      initialAddresses: initialAddresses,
      initialRegularAddressIndex: initialRegularAddressIndex,
      initialChangeAddressIndex: initialChangeAddressIndex,
      initialSilentAddresses: initialSilentAddresses,
      initialSilentAddressIndex: initialSilentAddressIndex,
      mainHd: hd,
      sideHd: accountHD.childKey(Bip32KeyIndex(1)),
      network: networkParam ?? network,
      masterHd: seedBytes != null ? Bip32Slip10Secp256k1.fromSeed(seedBytes) : null,
    );

    autorun((_) {
      this.walletAddresses.isEnabledAutoGenerateSubaddress = this.isEnabledAutoGenerateSubaddress;
    });
  }

  static Future<BitcoinWallet> create({
    required String mnemonic,
    required String password,
    required WalletInfo walletInfo,
    required Box<UnspentCoinsInfo> unspentCoinsInfo,
    String? passphrase,
    String? addressPageType,
    BasedUtxoNetwork? network,
    List<BitcoinAddressRecord>? initialAddresses,
    List<BitcoinSilentPaymentAddressRecord>? initialSilentAddresses,
    ElectrumBalance? initialBalance,
    Map<String, int>? initialRegularAddressIndex,
    Map<String, int>? initialChangeAddressIndex,
    int initialSilentAddressIndex = 0,
  }) async {
    late Uint8List seedBytes;

    switch (walletInfo.derivationInfo?.derivationType) {
      case DerivationType.bip39:
        seedBytes = await bip39.mnemonicToSeed(
          mnemonic,
          passphrase: passphrase ?? "",
        );
        break;
      case DerivationType.electrum:
      default:
        seedBytes = await mnemonicToSeedBytes(mnemonic);
        break;
    }
    return BitcoinWallet(
      mnemonic: mnemonic,
      passphrase: passphrase ?? "",
      password: password,
      walletInfo: walletInfo,
      unspentCoinsInfo: unspentCoinsInfo,
      initialAddresses: initialAddresses,
      initialSilentAddresses: initialSilentAddresses,
      initialSilentAddressIndex: initialSilentAddressIndex,
      initialBalance: initialBalance,
      seedBytes: seedBytes,
      initialRegularAddressIndex: initialRegularAddressIndex,
      initialChangeAddressIndex: initialChangeAddressIndex,
      addressPageType: addressPageType,
      networkParam: network,
    );
  }

  static Future<BitcoinWallet> open({
    required String name,
    required WalletInfo walletInfo,
    required Box<UnspentCoinsInfo> unspentCoinsInfo,
    required String password,
    required bool alwaysScan,
  }) async {
    final network = walletInfo.network != null
        ? BasedUtxoNetwork.fromName(walletInfo.network!)
        : BitcoinNetwork.mainnet;

    final hasKeysFile = await WalletKeysFile.hasKeysFile(name, walletInfo.type);

    ElectrumWalletSnapshot? snp = null;

    try {
      snp = await ElectrumWalletSnapshot.load(name, walletInfo.type, password, network);
    } catch (e) {
      if (!hasKeysFile) rethrow;
    }

    final WalletKeysData keysData;
    // Migrate wallet from the old scheme to then new .keys file scheme
    if (!hasKeysFile) {
      keysData =
          WalletKeysData(mnemonic: snp!.mnemonic, xPub: snp.xpub, passphrase: snp.passphrase);
    } else {
      keysData = await WalletKeysFile.readKeysFile(name, walletInfo.type, password);
    }

    walletInfo.derivationInfo ??= DerivationInfo();

    // set the default if not present:
    walletInfo.derivationInfo!.derivationPath ??= snp?.derivationPath ?? electrum_path;
    walletInfo.derivationInfo!.derivationType ??= snp?.derivationType ?? DerivationType.electrum;

    Uint8List? seedBytes = null;
    final mnemonic = keysData.mnemonic;
    final passphrase = keysData.passphrase;

    if (mnemonic != null) {
      switch (walletInfo.derivationInfo!.derivationType) {
        case DerivationType.electrum:
          seedBytes = await mnemonicToSeedBytes(mnemonic);
          break;
        case DerivationType.bip39:
        default:
          seedBytes = await bip39.mnemonicToSeed(
            mnemonic,
            passphrase: passphrase ?? '',
          );
          break;
      }
    }

    return BitcoinWallet(
      mnemonic: mnemonic,
      xpub: keysData.xPub,
      password: password,
      passphrase: passphrase,
      walletInfo: walletInfo,
      unspentCoinsInfo: unspentCoinsInfo,
      initialAddresses: snp?.addresses,
      initialSilentAddresses: snp?.silentAddresses,
      initialSilentAddressIndex: snp?.silentAddressIndex ?? 0,
      initialBalance: snp?.balance,
      seedBytes: seedBytes,
      initialRegularAddressIndex: snp?.regularAddressIndex,
      initialChangeAddressIndex: snp?.changeAddressIndex,
      addressPageType: snp?.addressPageType,
      networkParam: network,
      alwaysScan: alwaysScan,
    );
  }

  Ledger? _ledger;
  LedgerDevice? _ledgerDevice;
  BitcoinLedgerApp? _bitcoinLedgerApp;

  void setLedger(Ledger setLedger, LedgerDevice setLedgerDevice) {
    _ledger = setLedger;
    _ledgerDevice = setLedgerDevice;
    _bitcoinLedgerApp =
        BitcoinLedgerApp(_ledger!, derivationPath: walletInfo.derivationInfo!.derivationPath!);
  }

  @override
  Future<BtcTransaction> buildHardwareWalletTransaction({
    required List<BitcoinBaseOutput> outputs,
    required BigInt fee,
    required BasedUtxoNetwork network,
    required List<UtxoWithAddress> utxos,
    required Map<String, PublicKeyWithDerivationPath> publicKeys,
    String? memo,
    bool enableRBF = false,
    BitcoinOrdering inputOrdering = BitcoinOrdering.bip69,
    BitcoinOrdering outputOrdering = BitcoinOrdering.bip69,
  }) async {
    final masterFingerprint = await _bitcoinLedgerApp!.getMasterFingerprint(_ledgerDevice!);

    final psbtReadyInputs = <PSBTReadyUtxoWithAddress>[];
    for (final utxo in utxos) {
      final rawTx = await electrumClient.getTransactionHex(hash: utxo.utxo.txHash);
      final publicKeyAndDerivationPath = publicKeys[utxo.ownerDetails.address.pubKeyHash()]!;

      psbtReadyInputs.add(PSBTReadyUtxoWithAddress(
        utxo: utxo.utxo,
        rawTx: rawTx,
        ownerDetails: utxo.ownerDetails,
        ownerDerivationPath: publicKeyAndDerivationPath.derivationPath,
        ownerMasterFingerprint: masterFingerprint,
        ownerPublicKey: publicKeyAndDerivationPath.publicKey,
      ));
    }

    final psbt =
        PSBTTransactionBuild(inputs: psbtReadyInputs, outputs: outputs, enableRBF: enableRBF);

    final rawHex = await _bitcoinLedgerApp!.signPsbt(_ledgerDevice!, psbt: psbt.psbt);
    return BtcTransaction.fromRaw(BytesUtils.toHexString(rawHex));
  }

  @override
  Future<String> signMessage(String message, {String? address = null}) async {
    if (walletInfo.isHardwareWallet) {
      final addressEntry = address != null
          ? walletAddresses.allAddresses.firstWhere((element) => element.address == address)
          : null;
      final index = addressEntry?.index ?? 0;
      final isChange = addressEntry?.isHidden == true ? 1 : 0;
      final accountPath = walletInfo.derivationInfo?.derivationPath;
      final derivationPath = accountPath != null ? "$accountPath/$isChange/$index" : null;

      final signature = await _bitcoinLedgerApp!.signMessage(_ledgerDevice!,
          message: ascii.encode(message), signDerivationPath: derivationPath);
      return base64Encode(signature);
    }

    return super.signMessage(message, address: address);
  }
}