stack_wallet/lib/wallets/wallet/impl/dogecoin_wallet.dart

import 'package:isar/isar.dart';
import 'package:stackwallet/models/isar/models/blockchain_data/address.dart';
import 'package:stackwallet/utilities/amount/amount.dart';
import 'package:stackwallet/utilities/extensions/extensions.dart';
import 'package:stackwallet/wallets/crypto_currency/coins/dogecoin.dart';
import 'package:stackwallet/wallets/crypto_currency/crypto_currency.dart';
import 'package:stackwallet/wallets/wallet/intermediate/bip39_hd_wallet.dart';
import 'package:stackwallet/wallets/wallet/wallet_mixin_interfaces/coin_control_interface.dart';
import 'package:stackwallet/wallets/wallet/wallet_mixin_interfaces/electrumx_interface.dart';
import 'package:tuple/tuple.dart';

class DogecoinWallet extends Bip39HDWallet
    with ElectrumXInterface, CoinControlInterface {
  DogecoinWallet(CryptoCurrencyNetwork network) : super(Dogecoin(network));

  @override
  FilterOperation? get changeAddressFilterOperation =>
      FilterGroup.and(standardChangeAddressFilters);

  @override
  FilterOperation? get receivingAddressFilterOperation =>
      FilterGroup.and(standardReceivingAddressFilters);

  // ===========================================================================

  @override
  Future<List<Address>> fetchAddressesForElectrumXScan() async {
    final allAddresses = await mainDB
        .getAddresses(walletId)
        .filter()
        .not()
        .group(
          (q) => q
              .typeEqualTo(AddressType.nonWallet)
              .or()
              .subTypeEqualTo(AddressSubType.nonWallet),
        )
        .findAll();
    return allAddresses;
  }

  // ===========================================================================

  @override
  Future<void> updateTransactions() async {
    final currentChainHeight = await fetchChainHeight();

    // TODO: [prio=med] switch to V2 transactions
    final data = await fetchTransactionsV1(
      addresses: await fetchAddressesForElectrumXScan(),
      currentChainHeight: currentChainHeight,
    );

    await mainDB.addNewTransactionData(
      data
          .map((e) => Tuple2(
                e.transaction,
                e.address,
              ))
          .toList(),
      walletId,
    );
  }

  @override
  Future<({String? blockedReason, bool blocked, String? utxoLabel})>
      checkBlockUTXO(
    Map<String, dynamic> jsonUTXO,
    String? scriptPubKeyHex,
    Map<String, dynamic> jsonTX,
    String? utxoOwnerAddress,
  ) async {
    bool blocked = false;
    String? blockedReason;

    // check for bip47 notification
    final outputs = jsonTX["vout"] as List;
    for (final output in outputs) {
      List<String>? scriptChunks =
          (output['scriptPubKey']?['asm'] as String?)?.split(" ");
      if (scriptChunks?.length == 2 && scriptChunks?[0] == "OP_RETURN") {
        final blindedPaymentCode = scriptChunks![1];
        final bytes = blindedPaymentCode.toUint8ListFromHex;

        // https://en.bitcoin.it/wiki/BIP_0047#Sending
        if (bytes.length == 80 && bytes.first == 1) {
          blocked = true;
          blockedReason = "Paynym notification output. Incautious "
              "handling of outputs from notification transactions "
              "may cause unintended loss of privacy.";
          break;
        }
      }
    }

    return (blockedReason: blockedReason, blocked: blocked, utxoLabel: null);
  }

  @override
  Amount roughFeeEstimate(int inputCount, int outputCount, int feeRatePerKB) {
    return Amount(
      rawValue: BigInt.from(((181 * inputCount) + (34 * outputCount) + 10) *
          (feeRatePerKB / 1000).ceil()),
      fractionDigits: cryptoCurrency.fractionDigits,
    );
  }

  @override
  int estimateTxFee({required int vSize, required int feeRatePerKB}) {
    return vSize * (feeRatePerKB / 1000).ceil();
  }
}