mirror of
https://github.com/cypherstack/stack_wallet.git
synced 2024-09-30 10:21:17 +00:00
348 lines
11 KiB
Dart
348 lines
11 KiB
Dart
import 'dart:math';
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import 'package:decimal/decimal.dart';
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import 'package:ethereum_addresses/ethereum_addresses.dart';
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import 'package:http/http.dart';
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import 'package:stackwallet/models/ethereum/eth_token.dart';
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import 'package:stackwallet/models/node_model.dart';
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import 'package:stackwallet/models/paymint/fee_object_model.dart';
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import 'package:stackwallet/models/paymint/transactions_model.dart';
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import 'package:stackwallet/services/ethereum/ethereum_api.dart';
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import 'package:stackwallet/services/node_service.dart';
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import 'package:stackwallet/services/transaction_notification_tracker.dart';
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import 'package:stackwallet/utilities/default_nodes.dart';
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import 'package:stackwallet/utilities/enums/coin_enum.dart';
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import 'package:stackwallet/utilities/enums/fee_rate_type_enum.dart';
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import 'package:stackwallet/utilities/eth_commons.dart';
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import 'package:stackwallet/utilities/flutter_secure_storage_interface.dart';
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import 'package:stackwallet/utilities/format.dart';
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import 'package:web3dart/web3dart.dart' as web3dart;
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const int MINIMUM_CONFIRMATIONS = 3;
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class EthereumTokenService {
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final EthToken token;
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late bool shouldAutoSync;
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late web3dart.EthereumAddress _contractAddress;
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late web3dart.EthPrivateKey _credentials;
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late web3dart.DeployedContract _contract;
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late web3dart.ContractFunction _balanceFunction;
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late web3dart.ContractFunction _sendFunction;
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late Future<List<String>> _walletMnemonic;
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late SecureStorageInterface _secureStore;
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late String _tokenAbi;
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late web3dart.Web3Client _client;
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late final TransactionNotificationTracker txTracker;
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TransactionData? cachedTxData;
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final _gasLimit = 200000;
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EthereumTokenService({
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required this.token,
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required Future<List<String>> walletMnemonic,
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required SecureStorageInterface secureStore,
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}) {
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_contractAddress = web3dart.EthereumAddress.fromHex(token.contractAddress);
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_walletMnemonic = walletMnemonic;
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_secureStore = secureStore;
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}
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Future<List<String>> get allOwnAddresses =>
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_allOwnAddresses ??= _fetchAllOwnAddresses();
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Future<List<String>>? _allOwnAddresses;
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Future<List<String>> _fetchAllOwnAddresses() async {
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List<String> addresses = [];
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final ownAddress = _credentials.address;
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addresses.add(ownAddress.toString());
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return addresses;
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}
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Future<Decimal> get availableBalance async {
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return await totalBalance;
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}
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Coin get coin => Coin.ethereum;
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Future<String> confirmSend({required Map<String, dynamic> txData}) async {
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final amount = txData['recipientAmt'];
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final decimalAmount =
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Format.satoshisToAmount(amount as int, coin: Coin.ethereum);
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final bigIntAmount =
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amountToBigInt(decimalAmount.toDouble(), token.decimals);
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final sentTx = await _client.sendTransaction(
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_credentials,
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web3dart.Transaction.callContract(
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contract: _contract,
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function: _sendFunction,
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parameters: [
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web3dart.EthereumAddress.fromHex(txData['address'] as String),
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bigIntAmount
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],
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maxGas: _gasLimit,
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gasPrice: web3dart.EtherAmount.fromUnitAndValue(
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web3dart.EtherUnit.wei, txData['feeInWei'])));
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return sentTx;
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}
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Future<String> get currentReceivingAddress async {
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final _currentReceivingAddress = await _credentials.extractAddress();
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final checkSumAddress =
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checksumEthereumAddress(_currentReceivingAddress.toString());
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return checkSumAddress;
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}
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Future<int> estimateFeeFor(int satoshiAmount, int feeRate) async {
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final fee = estimateFee(feeRate, _gasLimit, token.decimals);
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return Format.decimalAmountToSatoshis(Decimal.parse(fee.toString()), coin);
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}
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Future<FeeObject> get fees => _feeObject ??= _getFees();
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Future<FeeObject>? _feeObject;
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Future<FeeObject> _getFees() async {
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return await EthereumAPI.getFees();
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}
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Future<void> initializeExisting() async {
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_tokenAbi = (await _secureStore.read(
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key: '${_contractAddress.toString()}_tokenAbi'))!;
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final mnemonic = await _walletMnemonic;
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String mnemonicString = mnemonic.join(' ');
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//Get private key for given mnemonic
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// TODO: replace empty string with actual passphrase
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String privateKey = getPrivateKey(mnemonicString, "");
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_credentials = web3dart.EthPrivateKey.fromHex(privateKey);
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_contract = web3dart.DeployedContract(
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web3dart.ContractAbi.fromJson(_tokenAbi, token.name), _contractAddress);
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_balanceFunction = _contract.function('balanceOf');
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_sendFunction = _contract.function('transfer');
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_client = await getEthClient();
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// print(_credentials.p)
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}
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Future<void> initializeNew() async {
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AbiRequestResponse abi =
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await EthereumAPI.fetchTokenAbi(_contractAddress.hex);
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//Fetch token ABI so we can call token functions
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if (abi.message == "OK") {
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_tokenAbi = abi.result;
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//Store abi in secure store
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await _secureStore.write(
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key: '${_contractAddress.hex}_tokenAbi', value: _tokenAbi);
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} else {
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throw Exception('Failed to load token abi');
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}
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final mnemonic = await _walletMnemonic;
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String mnemonicString = mnemonic.join(' ');
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//Get private key for given mnemonic
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// TODO: replace empty string with actual passphrase
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String privateKey = getPrivateKey(mnemonicString, "");
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_credentials = web3dart.EthPrivateKey.fromHex(privateKey);
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_contract = web3dart.DeployedContract(
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web3dart.ContractAbi.fromJson(_tokenAbi, token.name), _contractAddress);
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_balanceFunction = _contract.function('balanceOf');
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_sendFunction = _contract.function('transfer');
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_client = await getEthClient();
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}
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// TODO: implement isRefreshing
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bool get isRefreshing => throw UnimplementedError();
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Future<int> get maxFee async {
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final fee = (await fees).fast;
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final feeEstimate = await estimateFeeFor(0, fee);
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return feeEstimate;
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}
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Future<Map<String, dynamic>> prepareSend(
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{required String address,
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required int satoshiAmount,
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Map<String, dynamic>? args}) async {
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final feeRateType = args?["feeRate"];
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int fee = 0;
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final feeObject = await fees;
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switch (feeRateType) {
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case FeeRateType.fast:
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fee = feeObject.fast;
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break;
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case FeeRateType.average:
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fee = feeObject.medium;
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break;
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case FeeRateType.slow:
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fee = feeObject.slow;
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break;
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}
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final feeEstimate = await estimateFeeFor(satoshiAmount, fee);
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bool isSendAll = false;
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final balance =
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Format.decimalAmountToSatoshis(await availableBalance, coin);
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if (satoshiAmount == balance) {
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isSendAll = true;
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}
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if (isSendAll) {
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//Send the full balance
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satoshiAmount = balance;
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}
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Map<String, dynamic> txData = {
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"fee": feeEstimate,
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"feeInWei": fee,
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"address": address,
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"recipientAmt": satoshiAmount,
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};
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return txData;
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}
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Future<void> refresh() {
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// TODO: implement refresh
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throw UnimplementedError();
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}
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Future<Decimal> get totalBalance async {
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final balanceRequest = await _client.call(
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contract: _contract,
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function: _balanceFunction,
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params: [_credentials.address]);
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String balance = balanceRequest.first.toString();
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final balanceInDecimal = Format.satoshisToEthTokenAmount(
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int.parse(balance),
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token.decimals,
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);
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return Decimal.parse(balanceInDecimal.toString());
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}
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Future<TransactionData> get transactionData =>
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_transactionData ??= _fetchTransactionData();
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Future<TransactionData>? _transactionData;
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Future<TransactionData> _fetchTransactionData() async {
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String thisAddress = await currentReceivingAddress;
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final List<Map<String, dynamic>> midSortedArray = [];
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AddressTransaction txs =
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await EthereumAPI.fetchAddressTransactions(thisAddress, "tokentx");
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if (txs.message == "OK") {
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final allTxs = txs.result;
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for (var element in allTxs) {
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Map<String, dynamic> midSortedTx = {};
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// create final tx map
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midSortedTx["txid"] = element["hash"];
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int confirmations = int.parse(element['confirmations'].toString());
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int transactionAmount = int.parse(element['value'].toString());
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int decimal = token.decimals; //Eth has up to 18 decimal places
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final transactionAmountInDecimal =
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transactionAmount / (pow(10, decimal));
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//Convert to satoshi, default display for other coins
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final satAmount = Format.decimalAmountToSatoshis(
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Decimal.parse(transactionAmountInDecimal.toString()), coin);
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midSortedTx["confirmed_status"] =
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(confirmations != 0) && (confirmations >= MINIMUM_CONFIRMATIONS);
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midSortedTx["confirmations"] = confirmations;
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midSortedTx["timestamp"] = element["timeStamp"];
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if (checksumEthereumAddress(element["from"].toString()) ==
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thisAddress) {
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midSortedTx["txType"] = "Sent";
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} else {
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midSortedTx["txType"] = "Received";
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}
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midSortedTx["amount"] = satAmount;
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//Calculate fees (GasLimit * gasPrice)
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int txFee = int.parse(element['gasPrice'].toString()) *
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int.parse(element['gasUsed'].toString());
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final txFeeDecimal = txFee / (pow(10, decimal));
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midSortedTx["aliens"] = <dynamic>[];
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midSortedTx["fees"] = Format.decimalAmountToSatoshis(
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Decimal.parse(txFeeDecimal.toString()), coin);
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midSortedTx["address"] = element["to"];
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midSortedTx["inputSize"] = 1;
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midSortedTx["outputSize"] = 1;
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midSortedTx["inputs"] = <dynamic>[];
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midSortedTx["outputs"] = <dynamic>[];
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midSortedTx["height"] = int.parse(element['blockNumber'].toString());
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midSortedArray.add(midSortedTx);
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}
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}
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midSortedArray.sort((a, b) =>
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(int.parse(b['timestamp'].toString())) -
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(int.parse(a['timestamp'].toString())));
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// buildDateTimeChunks
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final Map<String, dynamic> result = {"dateTimeChunks": <dynamic>[]};
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final dateArray = <dynamic>[];
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for (int i = 0; i < midSortedArray.length; i++) {
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final txObject = midSortedArray[i];
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final date =
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extractDateFromTimestamp(int.parse(txObject['timestamp'].toString()));
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final txTimeArray = [txObject["timestamp"], date];
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if (dateArray.contains(txTimeArray[1])) {
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result["dateTimeChunks"].forEach((dynamic chunk) {
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if (extractDateFromTimestamp(
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int.parse(chunk['timestamp'].toString())) ==
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txTimeArray[1]) {
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if (chunk["transactions"] == null) {
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chunk["transactions"] = <Map<String, dynamic>>[];
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}
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chunk["transactions"].add(txObject);
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}
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});
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} else {
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dateArray.add(txTimeArray[1]);
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final chunk = {
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"timestamp": txTimeArray[0],
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"transactions": [txObject],
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};
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result["dateTimeChunks"].add(chunk);
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}
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}
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final txModel = TransactionData.fromMap(
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TransactionData.fromJson(result).getAllTransactions());
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cachedTxData = txModel;
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return txModel;
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}
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bool validateAddress(String address) {
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return isValidEthereumAddress(address);
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}
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Future<NodeModel> getCurrentNode() async {
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return NodeService(secureStorageInterface: _secureStore)
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.getPrimaryNodeFor(coin: coin) ??
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DefaultNodes.getNodeFor(coin);
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}
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Future<web3dart.Web3Client> getEthClient() async {
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final node = await getCurrentNode();
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return web3dart.Web3Client(node.host, Client());
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}
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}
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