cake_wallet/lib/bitcoin/bitcoin_transaction_info.dart

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import 'package:flutter/foundation.dart';
import 'package:bitcoin_flutter/bitcoin_flutter.dart' as bitcoin;
import 'package:bitcoin_flutter/src/payments/index.dart' show PaymentData;
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import 'package:cake_wallet/bitcoin/bitcoin_address_record.dart';
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import 'package:cake_wallet/bitcoin/bitcoin_amount_format.dart';
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import 'package:cake_wallet/entities/transaction_direction.dart';
import 'package:cake_wallet/entities/transaction_info.dart';
import 'package:cake_wallet/entities/format_amount.dart';
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class BitcoinTransactionInfo extends TransactionInfo {
BitcoinTransactionInfo(
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{@required String id,
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@required int height,
@required int amount,
@required TransactionDirection direction,
@required bool isPending,
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@required DateTime date,
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@required int confirmations}) {
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this.id = id;
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this.height = height;
this.amount = amount;
this.direction = direction;
this.date = date;
this.isPending = isPending;
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this.confirmations = confirmations;
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}
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factory BitcoinTransactionInfo.fromElectrumVerbose(Map<String, Object> obj,
{@required List<BitcoinAddressRecord> addresses, @required int height}) {
final addressesSet = addresses.map((addr) => addr.address).toSet();
final id = obj['txid'] as String;
final vins = obj['vin'] as List<Object> ?? [];
final vout = (obj['vout'] as List<Object> ?? []);
final date = obj['time'] is int
? DateTime.fromMillisecondsSinceEpoch((obj['time'] as int) * 1000)
: DateTime.now();
final confirmations = obj['confirmations'] as int ?? 0;
var direction = TransactionDirection.incoming;
for (dynamic vin in vins) {
final vout = vin['vout'] as int;
final out = vin['tx']['vout'][vout] as Map;
final outAddresses =
(out['scriptPubKey']['addresses'] as List<Object>)?.toSet();
if (outAddresses?.intersection(addressesSet)?.isNotEmpty ?? false) {
direction = TransactionDirection.outgoing;
break;
}
}
final amount = vout.fold(0, (int acc, dynamic out) {
final outAddresses =
out['scriptPubKey']['addresses'] as List<Object> ?? [];
final ntrs = outAddresses.toSet().intersection(addressesSet);
var amount = acc;
if ((direction == TransactionDirection.incoming && ntrs.isNotEmpty) ||
(direction == TransactionDirection.outgoing && ntrs.isEmpty)) {
amount += doubleToBitcoinAmount(out['value'] as double ?? 0.0);
}
return amount;
});
return BitcoinTransactionInfo(
id: id,
height: height,
isPending: false,
direction: direction,
amount: amount,
date: date,
confirmations: confirmations);
}
factory BitcoinTransactionInfo.fromHexAndHeader(String hex,
{List<String> addresses, int height, int timestamp, int confirmations}) {
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final tx = bitcoin.Transaction.fromHex(hex);
var exist = false;
var amount = 0;
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if (addresses != null) {
tx.outs.forEach((out) {
try {
final p2pkh = bitcoin.P2PKH(
data: PaymentData(output: out.script), network: bitcoin.bitcoin);
exist = addresses.contains(p2pkh.data.address);
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if (exist) {
amount += out.value;
}
} catch (_) {}
});
}
final date = timestamp != null
? DateTime.fromMillisecondsSinceEpoch(timestamp * 1000)
: DateTime.now();
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return BitcoinTransactionInfo(
id: tx.getId(),
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height: height,
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isPending: false,
direction: TransactionDirection.incoming,
amount: amount,
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date: date,
confirmations: confirmations);
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}
factory BitcoinTransactionInfo.fromJson(Map<String, dynamic> data) {
return BitcoinTransactionInfo(
id: data['id'] as String,
height: data['height'] as int,
amount: data['amount'] as int,
direction: parseTransactionDirectionFromInt(data['direction'] as int),
date: DateTime.fromMillisecondsSinceEpoch(data['date'] as int),
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isPending: data['isPending'] as bool,
confirmations: data['confirmations'] as int);
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}
String _fiatAmount;
@override
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String amountFormatted() =>
'${formatAmount(bitcoinAmountToString(amount: amount))} BTC';
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@override
String fiatAmount() => _fiatAmount ?? '';
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@override
void changeFiatAmount(String amount) => _fiatAmount = formatAmount(amount);
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Map<String, dynamic> toJson() {
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final m = <String, dynamic>{};
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m['id'] = id;
m['height'] = height;
m['amount'] = amount;
m['direction'] = direction.index;
m['date'] = date.millisecondsSinceEpoch;
m['isPending'] = isPending;
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m['confirmations'] = confirmations;
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return m;
}
}