mirror of
https://github.com/cypherstack/stack_wallet.git
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80 lines
2.6 KiB
Dart
80 lines
2.6 KiB
Dart
import 'package:bip32/bip32.dart' as bip32;
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import 'package:bip39/bip39.dart' as bip39;
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import 'package:decimal/decimal.dart';
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import "package:hex/hex.dart";
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import 'package:stackwallet/utilities/amount/amount.dart';
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import 'package:stackwallet/utilities/constants.dart';
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import 'package:stackwallet/utilities/enums/coin_enum.dart';
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class GasTracker {
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final Decimal average;
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final Decimal fast;
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final Decimal slow;
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final int numberOfBlocksFast;
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final int numberOfBlocksAverage;
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final int numberOfBlocksSlow;
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final int timestamp;
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const GasTracker({
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required this.average,
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required this.fast,
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required this.slow,
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required this.numberOfBlocksFast,
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required this.numberOfBlocksAverage,
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required this.numberOfBlocksSlow,
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required this.timestamp,
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});
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factory GasTracker.fromJson(Map<String, dynamic> json) {
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final targetTime = Constants.targetBlockTimeInSeconds(Coin.ethereum);
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return GasTracker(
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average: Decimal.parse(json["average"]["price"].toString()),
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fast: Decimal.parse(json["fast"]["price"].toString()),
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slow: Decimal.parse(json["slow"]["price"].toString()),
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numberOfBlocksAverage: (json["average"]["time"] as int) ~/ targetTime,
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numberOfBlocksFast: (json["fast"]["time"] as int) ~/ targetTime,
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numberOfBlocksSlow: (json["slow"]["time"] as int) ~/ targetTime,
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timestamp: json["timestamp"] as int,
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);
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}
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}
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const hdPathEthereum = "m/44'/60'/0'/0";
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// equal to "0x${keccak256("Transfer(address,address,uint256)".toUint8ListFromUtf8).toHex}";
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const kTransferEventSignature =
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"0xddf252ad1be2c89b69c2b068fc378daa952ba7f163c4a11628f55a4df523b3ef";
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String getPrivateKey(String mnemonic, String mnemonicPassphrase) {
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final isValidMnemonic = bip39.validateMnemonic(mnemonic);
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if (!isValidMnemonic) {
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throw 'Invalid mnemonic';
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}
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final seed = bip39.mnemonicToSeed(mnemonic, passphrase: mnemonicPassphrase);
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final root = bip32.BIP32.fromSeed(seed);
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const index = 0;
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final addressAtIndex = root.derivePath("$hdPathEthereum/$index");
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return HEX.encode(addressAtIndex.privateKey as List<int>);
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}
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Amount estimateFee(int feeRate, int gasLimit, int decimals) {
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final gweiAmount = feeRate.toDecimal() / (Decimal.ten.pow(9).toDecimal());
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final fee = gasLimit.toDecimal() *
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gweiAmount.toDecimal(
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scaleOnInfinitePrecision: Coin.ethereum.decimals,
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);
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//Convert gwei to ETH
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final feeInWei = fee * Decimal.ten.pow(9).toDecimal();
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final ethAmount = feeInWei / Decimal.ten.pow(decimals).toDecimal();
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return Amount.fromDecimal(
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ethAmount.toDecimal(
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scaleOnInfinitePrecision: Coin.ethereum.decimals,
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),
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fractionDigits: decimals,
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);
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}
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