Fix int overflow

cw_ethereum/lib/ethereum_formatter.dart

@@ -1,6 +1,28 @@
 import 'dart:math';
 
+import 'package:intl/intl.dart';
+
+const ethereumAmountLength = 12;
+const ethereumAmountDivider = 1000000000000;
+final ethereumAmountFormat = NumberFormat()
+  ..maximumFractionDigits = ethereumAmountLength
+  ..minimumFractionDigits = 1;
+
 class EthereumFormatter {
-  static int parseEthereumAmount(String amount) =>
-      BigInt.from(double.parse(amount) * (pow(10, 18))).toInt();
+  static int parseEthereumAmount(String amount) {
+    try {
+      return (double.parse(amount) * ethereumAmountDivider).round();
+    } catch (_) {
+      return 0;
+    }
+  }
+
+  static int parseEthereumBigIntAmount(BigInt amount) {
+    try {
+      double result = amount / BigInt.from(pow(10, 18 - ethereumAmountLength));
+      return result.toInt();
+    } catch (_) {
+      return 0;
+    }
+  }
 }

cw_ethereum/lib/ethereum_transaction_info.dart

@@ -6,31 +6,34 @@ class EthereumTransactionInfo extends TransactionInfo {
   EthereumTransactionInfo({
     required this.id,
     required this.height,
-    required this.amount,
-    required this.fee,
+    required this.ethAmount,
+    required this.ethFee,
     this.tokenSymbol = "ETH",
     this.exponent = 18,
     required this.direction,
     required this.isPending,
     required this.date,
     required this.confirmations,
-  });
+  })  : this.amount = ethAmount.toInt(),
+        this.fee = ethFee.toInt();
 
   final String id;
   final int height;
   final int amount;
+  final BigInt ethAmount;
   final int exponent;
   final TransactionDirection direction;
   final DateTime date;
   final bool isPending;
   final int fee;
+  final BigInt ethFee;
   final int confirmations;
   final String tokenSymbol;
   String? _fiatAmount;
 
   @override
   String amountFormatted() =>
-      '${formatAmount((BigInt.from(amount) / BigInt.from(10).pow(exponent)).toString())} $tokenSymbol';
+      '${formatAmount((ethAmount / BigInt.from(10).pow(exponent)).toString())} $tokenSymbol';
 
   @override
   String fiatAmount() => _fiatAmount ?? '';
@@ -39,15 +42,15 @@ class EthereumTransactionInfo extends TransactionInfo {
   void changeFiatAmount(String amount) => _fiatAmount = formatAmount(amount);
 
   @override
-  String feeFormatted() => '${(BigInt.from(fee) / BigInt.from(10).pow(18)).toString()} ETH';
+  String feeFormatted() => '${(ethFee / BigInt.from(10).pow(18)).toString()} ETH';
 
   factory EthereumTransactionInfo.fromJson(Map<String, dynamic> data) {
     return EthereumTransactionInfo(
       id: data['id'] as String,
       height: data['height'] as int,
-      amount: data['amount'] as int,
+      ethAmount: data['amount'] as BigInt,
       exponent: data['exponent'] as int,
-      fee: data['fee'] as int,
+      ethFee: data['fee'] as BigInt,
       direction: parseTransactionDirectionFromInt(data['direction'] as int),
       date: DateTime.fromMillisecondsSinceEpoch(data['date'] as int),
       isPending: data['isPending'] as bool,
@@ -59,9 +62,9 @@ class EthereumTransactionInfo extends TransactionInfo {
   Map<String, dynamic> toJson() => {
         'id': id,
         'height': height,
-        'amount': amount,
+        'amount': ethAmount,
         'exponent': exponent,
-        'fee': fee,
+        'fee': ethFee,
         'direction': direction.index,
         'date': date.millisecondsSinceEpoch,
         'isPending': isPending,

cw_ethereum/lib/ethereum_wallet.dart

@@ -1,6 +1,7 @@
 import 'dart:async';
 import 'dart:convert';
 import 'dart:io';
+import 'dart:math';
 
 import 'package:cw_core/crypto_currency.dart';
 import 'package:cw_core/node.dart';
@@ -16,6 +17,7 @@ import 'package:cw_ethereum/default_erc20_tokens.dart';
 import 'package:cw_ethereum/erc20_balance.dart';
 import 'package:cw_ethereum/ethereum_client.dart';
 import 'package:cw_ethereum/ethereum_exceptions.dart';
+import 'package:cw_ethereum/ethereum_formatter.dart';
 import 'package:cw_ethereum/ethereum_transaction_credentials.dart';
 import 'package:cw_ethereum/ethereum_transaction_history.dart';
 import 'package:cw_ethereum/ethereum_transaction_info.dart';
@@ -144,26 +146,30 @@ abstract class EthereumWalletBase
     final outputs = _credentials.outputs;
     final hasMultiDestination = outputs.length > 1;
     final _erc20Balance = balance[_credentials.currency]!;
-    int totalAmount = 0;
+    BigInt totalAmount = BigInt.zero;
+    BigInt amountToEthereumMultiplier = BigInt.from(pow(10, 18 - ethereumAmountLength));
 
     if (hasMultiDestination) {
       if (outputs.any((item) => item.sendAll || (item.formattedCryptoAmount ?? 0) <= 0)) {
         throw EthereumTransactionCreationException();
       }
 
-      totalAmount = outputs.fold(0, (acc, value) => acc + (value.formattedCryptoAmount ?? 0));
+      totalAmount =
+          BigInt.from(outputs.fold(0, (acc, value) => acc + (value.formattedCryptoAmount ?? 0))) *
+              amountToEthereumMultiplier;
 
-      if (_erc20Balance.balance < EtherAmount.inWei(totalAmount as BigInt).getInWei) {
+      if (_erc20Balance.balance < totalAmount) {
         throw EthereumTransactionCreationException();
       }
     } else {
       final output = outputs.first;
-      final int allAmount = _erc20Balance.balance.toInt() - feeRate(_credentials.priority!);
-      totalAmount = output.sendAll ? allAmount : output.formattedCryptoAmount ?? 0;
+      final BigInt allAmount = _erc20Balance.balance - BigInt.from(feeRate(_credentials.priority!));
+      totalAmount = output.sendAll
+          ? allAmount
+          : BigInt.from(output.formattedCryptoAmount ?? 0) * amountToEthereumMultiplier;
 
-      if ((output.sendAll &&
-              _erc20Balance.balance < EtherAmount.inWei(totalAmount as BigInt).getInWei) ||
-          (!output.sendAll && _erc20Balance.balance.toInt() <= 0)) {
+      if ((output.sendAll && _erc20Balance.balance < totalAmount) ||
+          (!output.sendAll && _erc20Balance.balance <= BigInt.zero)) {
         throw EthereumTransactionCreationException();
       }
     }
@@ -228,14 +234,14 @@ abstract class EthereumWalletBase
       result[transactionModel.hash] = EthereumTransactionInfo(
         id: transactionModel.hash,
         height: transactionModel.blockNumber,
-        amount: transactionModel.amount.toInt(),
+        ethAmount: transactionModel.amount,
         direction: transactionModel.from == address
             ? TransactionDirection.outgoing
             : TransactionDirection.incoming,
         isPending: false,
         date: transactionModel.date,
         confirmations: transactionModel.confirmations,
-        fee: transactionModel.gasUsed * transactionModel.gasPrice.toInt(),
+        ethFee: BigInt.from(transactionModel.gasUsed) * transactionModel.gasPrice,
         exponent: transactionModel.tokenDecimal ?? 18,
         tokenSymbol: transactionModel.tokenSymbol ?? "ETH",
       );