From d329cd56f2e11f097d63b9dbe829086f995e9a7d Mon Sep 17 00:00:00 2001
From: Serhii <borodenko.sv@gmail.com>
Date: Sun, 4 Feb 2024 21:17:12 +0200
Subject: [PATCH] resolve evm related merge conflicts

---
 cw_evm/lib/evm_chain_client.dart | 9 +++++++++
 cw_evm/lib/evm_chain_wallet.dart | 8 ++++++++
 2 files changed, 17 insertions(+)

diff --git a/cw_evm/lib/evm_chain_client.dart b/cw_evm/lib/evm_chain_client.dart
index de5b3874a..5e84ec796 100644
--- a/cw_evm/lib/evm_chain_client.dart
+++ b/cw_evm/lib/evm_chain_client.dart
@@ -14,6 +14,7 @@ import 'package:flutter/services.dart';
 import 'package:http/http.dart';
 import 'package:erc20/erc20.dart';
 import 'package:web3dart/web3dart.dart';
+import 'package:hex/hex.dart' as hex;
 
 abstract class EVMChainClient {
   final httpClient = Client();
@@ -85,6 +86,7 @@ abstract class EVMChainClient {
     required CryptoCurrency currency,
     required int exponent,
     String? contractAddress,
+    String? data,
   }) async {
     assert(currency == CryptoCurrency.eth ||
         currency == CryptoCurrency.maticpoly ||
@@ -100,6 +102,7 @@ abstract class EVMChainClient {
       to: EthereumAddress.fromHex(toAddress),
       maxPriorityFeePerGas: EtherAmount.fromInt(EtherUnit.gwei, priority.tip),
       amount: isEVMCompatibleChain ? EtherAmount.inWei(BigInt.parse(amount)) : EtherAmount.zero(),
+      data: data != null ? hexToBytes(data) : null,
     );
 
     final signedTransaction =
@@ -140,12 +143,14 @@ abstract class EVMChainClient {
     required EthereumAddress to,
     required EtherAmount amount,
     EtherAmount? maxPriorityFeePerGas,
+    Uint8List? data,
   }) {
     return Transaction(
       from: from,
       to: to,
       maxPriorityFeePerGas: maxPriorityFeePerGas,
       value: amount,
+      data: data,
     );
   }
 
@@ -222,6 +227,10 @@ abstract class EVMChainClient {
     }
   }
 
+  Uint8List hexToBytes(String hexString) {
+    return Uint8List.fromList(hex.HEX.decode(hexString.startsWith('0x') ? hexString.substring(2) : hexString));
+  }
+
   void stop() {
     _client?.dispose();
   }
diff --git a/cw_evm/lib/evm_chain_wallet.dart b/cw_evm/lib/evm_chain_wallet.dart
index ea19a8557..e553cf478 100644
--- a/cw_evm/lib/evm_chain_wallet.dart
+++ b/cw_evm/lib/evm_chain_wallet.dart
@@ -224,6 +224,13 @@ abstract class EVMChainWalletBase
     final outputs = _credentials.outputs;
     final hasMultiDestination = outputs.length > 1;
 
+    final String? opReturnMemo = outputs.first.memo;
+
+    String? hexOpReturnMemo;
+    if (opReturnMemo != null) {
+      hexOpReturnMemo = '0x${opReturnMemo.codeUnits.map((char) => char.toRadixString(16).padLeft(2, '0')).join()}';
+    }
+
     final CryptoCurrency transactionCurrency =
         balance.keys.firstWhere((element) => element.title == _credentials.currency.title);
 
@@ -279,6 +286,7 @@ abstract class EVMChainWalletBase
       exponent: exponent,
       contractAddress:
           transactionCurrency is Erc20Token ? transactionCurrency.contractAddress : null,
+      data: hexOpReturnMemo,
     );
 
     return pendingEVMChainTransaction;