cake_wallet/cw_nano/lib/nano_wallet.dart
2023-08-08 09:49:13 -04:00

407 lines
12 KiB
Dart

import 'dart:convert';
import 'dart:io';
import 'package:cw_core/crypto_currency.dart';
import 'package:cw_core/node.dart';
import 'package:cw_core/pathForWallet.dart';
import 'package:cw_core/pending_transaction.dart';
import 'package:cw_core/sync_status.dart';
import 'package:cw_core/transaction_direction.dart';
import 'package:cw_core/transaction_priority.dart';
import 'package:cw_core/wallet_addresses.dart';
import 'package:cw_core/wallet_info.dart';
import 'package:cw_nano/file.dart';
import 'package:cw_nano/nano_balance.dart';
import 'package:cw_nano/nano_client.dart';
import 'package:cw_nano/nano_transaction_credentials.dart';
import 'package:cw_nano/nano_transaction_history.dart';
import 'package:cw_nano/nano_transaction_info.dart';
import 'package:cw_nano/nano_util.dart';
import 'package:cw_nano/nano_wallet_info.dart';
import 'package:cw_nano/nano_wallet_keys.dart';
import 'package:cw_nano/pending_nano_transaction.dart';
import 'package:mobx/mobx.dart';
import 'dart:async';
import 'package:cw_nano/nano_wallet_addresses.dart';
import 'package:cw_core/wallet_base.dart';
import 'package:nanodart/nanodart.dart';
import 'package:web3dart/web3dart.dart';
import 'package:bip39/bip39.dart' as bip39;
part 'nano_wallet.g.dart';
class NanoWallet = NanoWalletBase with _$NanoWallet;
abstract class NanoWalletBase
extends WalletBase<NanoBalance, NanoTransactionHistory, NanoTransactionInfo> with Store {
NanoWalletBase({
required NanoWalletInfo walletInfo,
required String mnemonic,
required String password,
NanoBalance? initialBalance,
}) : syncStatus = NotConnectedSyncStatus(),
_password = password,
_mnemonic = mnemonic,
_derivationType = walletInfo.derivationType,
_isTransactionUpdating = false,
_client = NanoClient(),
walletAddresses = NanoWalletAddresses(walletInfo),
balance = ObservableMap<CryptoCurrency, NanoBalance>.of({
CryptoCurrency.nano: initialBalance ??
NanoBalance(currentBalance: BigInt.zero, receivableBalance: BigInt.zero)
}),
super(walletInfo) {
this.walletInfo = walletInfo;
transactionHistory = NanoTransactionHistory(walletInfo: walletInfo, password: password);
}
final String _mnemonic;
final String _password;
final DerivationType _derivationType;
String? _privateKey;
String? _publicAddress;
String? _seedKey;
String? _representativeAddress;
Timer? _receiveTimer;
late NanoClient _client;
bool _isTransactionUpdating;
@override
WalletAddresses walletAddresses;
@override
@observable
SyncStatus syncStatus;
@override
@observable
late ObservableMap<CryptoCurrency, NanoBalance> balance;
// initialize the different forms of private / public key we'll need:
Future<void> init() async {
final String type = (_derivationType == DerivationType.nano) ? "standard" : "hd";
_seedKey = bip39.mnemonicToEntropy(_mnemonic).toUpperCase();
_privateKey = await NanoUtil.uniSeedToPrivate(_seedKey!, 0, type);
_publicAddress = await NanoUtil.uniSeedToAddress(_seedKey!, 0, type);
this.walletInfo.address = _publicAddress!;
await walletAddresses.init();
await transactionHistory.init();
await save();
}
@override
int calculateEstimatedFee(TransactionPriority priority, int? amount) {
return 0; // always 0 :)
}
@override
Future<void> changePassword(String password) {
print("e");
throw UnimplementedError("changePassword");
}
@override
void close() {
_client.stop();
}
@action
@override
Future<void> connectToNode({required Node node}) async {
try {
syncStatus = ConnectingSyncStatus();
final isConnected = _client.connect(node);
if (!isConnected) {
throw Exception("Nano Node connection failed");
}
try {
await _updateBalance();
await _updateRep();
await _receiveAll();
} catch (e) {
print(e);
}
syncStatus = ConnectedSyncStatus();
} catch (e) {
print(e);
syncStatus = FailedSyncStatus();
}
}
@override
Future<PendingTransaction> createTransaction(Object credentials) async {
credentials = credentials as NanoTransactionCredentials;
BigInt runningAmount = BigInt.zero;
await _updateBalance();
BigInt runningBalance = balance[currency]?.currentBalance ?? BigInt.zero;
final List<Map<String, String>> blocks = [];
String? previousHash;
for (var txOut in credentials.outputs) {
late BigInt amt;
if (txOut.sendAll) {
amt = balance[currency]?.currentBalance ?? BigInt.zero;
} else {
amt = BigInt.tryParse(
NanoUtil.getAmountAsRaw(txOut.cryptoAmount ?? "0", NanoUtil.rawPerNano)) ??
BigInt.zero;
}
runningBalance = runningBalance - amt;
final block = await _client.constructSendBlock(
amountRaw: amt.toString(),
destinationAddress: txOut.address,
privateKey: _privateKey!,
balanceAfterTx: runningBalance,
previousHash: previousHash,
);
previousHash = NanoBlocks.computeStateHash(
NanoAccountType.NANO,
block["account"]!,
block["previous"]!,
block["representative"]!,
BigInt.parse(block["balance"]!),
block["link"]!,
);
blocks.add(block);
runningAmount += amt;
}
try {
if (runningAmount > balance[currency]!.currentBalance || runningBalance < BigInt.zero) {
throw Exception(("Trying to send more than entire balance!"));
}
} catch (e) {
rethrow;
}
return PendingNanoTransaction(
amount: runningAmount,
fee: 0,
id: "",
nanoClient: _client,
blocks: blocks,
);
}
Future<void> _receiveAll() async {
await _updateBalance();
int blocksReceived = await this._client.confirmAllReceivable(
destinationAddress: _publicAddress!,
privateKey: _privateKey!,
);
if (blocksReceived > 0) {
await Future<void>.delayed(Duration(seconds: 3));
_updateBalance();
updateTransactions();
}
}
Future<void> updateTransactions() async {
try {
if (_isTransactionUpdating) {
return;
}
_isTransactionUpdating = true;
final transactions = await fetchTransactions();
transactionHistory.addMany(transactions);
await transactionHistory.save();
_isTransactionUpdating = false;
} catch (_) {
_isTransactionUpdating = false;
}
}
@override
Future<Map<String, NanoTransactionInfo>> fetchTransactions() async {
String address = _publicAddress!;
final transactions = await _client.fetchTransactions(address);
final Map<String, NanoTransactionInfo> result = {};
for (var transactionModel in transactions) {
result[transactionModel.hash] = NanoTransactionInfo(
id: transactionModel.hash,
amountRaw: transactionModel.amount,
height: transactionModel.height,
direction: transactionModel.account == address
? TransactionDirection.outgoing
: TransactionDirection.incoming,
confirmed: transactionModel.confirmed,
date: transactionModel.date ?? DateTime.now(),
confirmations: transactionModel.confirmed ? 1 : 0,
);
}
return result;
}
@override
NanoWalletKeys get keys {
return NanoWalletKeys(seedKey: _seedKey!);
}
@override
Future<void> rescan({required int height}) async {
fetchTransactions();
_updateBalance();
return;
}
@override
Future<void> save() async {
await walletAddresses.updateAddressesInBox();
final path = await makePath();
await write(path: path, password: _password, data: toJSON());
await transactionHistory.save();
}
@override
String get seed => _mnemonic;
String get representative => _representativeAddress ?? "";
@action
@override
Future<void> startSync() async {
try {
syncStatus = AttemptingSyncStatus();
await _updateBalance();
await updateTransactions();
_receiveTimer?.cancel();
_receiveTimer = Timer.periodic(const Duration(seconds: 15), (timer) async {
// get our balance:
await _updateBalance();
// if we have anything to receive, process it:
if (balance[currency]!.receivableBalance > BigInt.zero) {
await _receiveAll();
}
});
syncStatus = SyncedSyncStatus();
} catch (e) {
print(e);
syncStatus = FailedSyncStatus();
rethrow;
}
}
Future<String> makePath() async => pathForWallet(name: walletInfo.name, type: walletInfo.type);
String toJSON() => json.encode({
'seedKey': _seedKey,
'mnemonic': _mnemonic,
'currentBalance': balance[currency]?.currentBalance.toString() ?? "0",
'receivableBalance': balance[currency]?.receivableBalance.toString() ?? "0",
'derivationType': _derivationType.toString()
});
static Future<NanoWallet> open({
required String name,
required String password,
required WalletInfo walletInfo,
}) async {
final path = await pathForWallet(name: name, type: walletInfo.type);
final jsonSource = await read(path: path, password: password);
final data = json.decode(jsonSource) as Map;
final mnemonic = data['mnemonic'] as String;
final balance = NanoBalance.fromString(
formattedCurrentBalance: data['currentBalance'] as String? ?? "0",
formattedReceivableBalance: data['receivableBalance'] as String? ?? "0");
DerivationType derivationType = DerivationType.bip39;
if (data['derivationType'] == "DerivationType.nano") {
derivationType = DerivationType.nano;
}
final nanoWalletInfo = NanoWalletInfo(
walletInfo: walletInfo,
derivationType: derivationType,
);
return NanoWallet(
walletInfo: nanoWalletInfo,
password: password,
mnemonic: mnemonic,
initialBalance: balance,
);
// init() should always be run after this!
}
Future<void> _updateBalance() async {
balance[currency] = await _client.getBalance(_publicAddress!);
await save();
}
Future<void> _updateRep() async {
try {
final accountInfo = await _client.getAccountInfo(_publicAddress!);
if (accountInfo["error"] != null) {
// account not found:
_representativeAddress = NanoClient.DEFAULT_REPRESENTATIVE;
} else {
_representativeAddress = accountInfo["representative"] as String;
}
} catch (e) {
throw Exception("Failed to get representative address $e");
}
}
Future<void> changeRep(String address) async {
try {
final String hash = await _client.changeRep(
privateKey: _privateKey!,
repAddress: address,
ourAddress: _publicAddress!,
);
if (hash.isNotEmpty) {
_representativeAddress = address;
}
} catch (e) {
throw Exception("Failed to change representative address $e");
}
}
Future<void>? updateBalance() async => await _updateBalance();
void _onNewTransaction(FilterEvent event) {
throw UnimplementedError();
}
@override
Future<void> renameWalletFiles(String newWalletName) async {
final currentWalletPath = await pathForWallet(name: walletInfo.name, type: type);
final currentWalletFile = File(currentWalletPath);
final currentDirPath = await pathForWalletDir(name: walletInfo.name, type: type);
final currentTransactionsFile = File('$currentDirPath/$transactionsHistoryFileName');
// Copies current wallet files into new wallet name's dir and files
if (currentWalletFile.existsSync()) {
final newWalletPath = await pathForWallet(name: newWalletName, type: type);
await currentWalletFile.copy(newWalletPath);
}
if (currentTransactionsFile.existsSync()) {
final newDirPath = await pathForWalletDir(name: newWalletName, type: type);
await currentTransactionsFile.copy('$newDirPath/$transactionsHistoryFileName');
}
// Delete old name's dir and files
await Directory(currentDirPath).delete(recursive: true);
}
}