Add forwardLocalGasFees option to EngineWallet

Introduces a forwardLocalGasFees parameter to EngineWallet, allowing control over whether locally calculated gas fees are forwarded to the engine. Updates the constructor, Create method, and transaction overrides logic to support this feature.

Author: 0xFirekeeper

Thirdweb/Thirdweb.Wallets/EngineWallet/EngineWallet.cs

@@ -22,14 +22,16 @@ public partial class EngineWallet : IThirdwebWallet
     private readonly string _walletAddress;
     private readonly IThirdwebHttpClient _engineClient;
     private readonly int? _timeoutSeconds;
+    private readonly bool _forwardLocalGasFees;
 
-    internal EngineWallet(ThirdwebClient client, IThirdwebHttpClient engineClient, string engineUrl, string walletAddress, int? timeoutSeconds)
+    internal EngineWallet(ThirdwebClient client, IThirdwebHttpClient engineClient, string engineUrl, string walletAddress, int? timeoutSeconds, bool forwardLocalGasFees)
     {
         this.Client = client;
         this._engineUrl = engineUrl;
         this._walletAddress = walletAddress;
         this._engineClient = engineClient;
         this._timeoutSeconds = timeoutSeconds;
+        this._forwardLocalGasFees = forwardLocalGasFees;
     }
 
     #region Creation
@@ -43,7 +45,16 @@ internal EngineWallet(ThirdwebClient client, IThirdwebHttpClient engineClient, s
     /// <param name="walletAddress">The backend wallet address to use.</param>
     /// <param name="timeoutSeconds">The timeout in seconds for the transaction. Defaults to no timeout.</param>
     /// <param name="additionalHeaders">Additional headers to include in requests. Authorization and X-Backend-Wallet-Address automatically included.</param>
-    public static EngineWallet Create(ThirdwebClient client, string engineUrl, string authToken, string walletAddress, int? timeoutSeconds = null, Dictionary<string, string> additionalHeaders = null)
+    /// <param name="forwardLocalGasFees">Whether to forward locally calculated gas price/fees to the engine. Defaults to false.</param>
+    public static EngineWallet Create(
+        ThirdwebClient client,
+        string engineUrl,
+        string authToken,
+        string walletAddress,
+        int? timeoutSeconds = null,
+        Dictionary<string, string> additionalHeaders = null,
+        bool forwardLocalGasFees = false
+    )
     {
         if (client == null)
         {
@@ -72,7 +83,7 @@ public static EngineWallet Create(ThirdwebClient client, string engineUrl, strin
 
         walletAddress = walletAddress.ToChecksumAddress();
 
-        var engineClient = Utils.ReconstructHttpClient(client.HttpClient, new Dictionary<string, string> { { "Authorization", $"Bearer {authToken}" }, });
+        var engineClient = Utils.ReconstructHttpClient(client.HttpClient, new Dictionary<string, string> { { "Authorization", $"Bearer {authToken}" } });
         engineClient.AddHeader("X-Backend-Wallet-Address", walletAddress);
         if (additionalHeaders != null)
         {
@@ -81,7 +92,7 @@ public static EngineWallet Create(ThirdwebClient client, string engineUrl, strin
                 engineClient.AddHeader(header.Key, header.Value);
             }
         }
-        var wallet = new EngineWallet(client, engineClient, engineUrl, walletAddress, timeoutSeconds);
+        var wallet = new EngineWallet(client, engineClient, engineUrl, walletAddress, timeoutSeconds, forwardLocalGasFees);
         Utils.TrackConnection(wallet);
         return wallet;
     }
@@ -125,28 +136,25 @@ private object ToEngineTransaction(ThirdwebTransactionInput transaction)
             data = transaction.Data,
             value = transaction.Value?.HexValue ?? "0x00",
             authorizationList = transaction.AuthorizationList != null && transaction.AuthorizationList.Count > 0
-                ? transaction.AuthorizationList
-                    .Select(
-                        authorization =>
-                            new
-                            {
-                                chainId = authorization.ChainId.HexToNumber(),
-                                address = authorization.Address,
-                                nonce = authorization.Nonce.HexToNumber(),
-                                yParity = authorization.YParity.HexToNumber(),
-                                r = authorization.R,
-                                s = authorization.S
-                            }
-                    )
+                ? transaction
+                    .AuthorizationList.Select(authorization => new
+                    {
+                        chainId = authorization.ChainId.HexToNumber(),
+                        address = authorization.Address,
+                        nonce = authorization.Nonce.HexToNumber(),
+                        yParity = authorization.YParity.HexToNumber(),
+                        r = authorization.R,
+                        s = authorization.S,
+                    })
                     .ToArray()
                 : null,
             txOverrides = this._timeoutSeconds != null || transaction.Gas != null || transaction.GasPrice != null || transaction.MaxFeePerGas != null || transaction.MaxPriorityFeePerGas != null
                 ? new
                 {
                     gas = transaction.Gas?.Value.ToString(),
-                    gasPrice = transaction.GasPrice?.Value.ToString(),
-                    maxFeePerGas = transaction.MaxFeePerGas?.Value.ToString(),
-                    maxPriorityFeePerGas = transaction.MaxPriorityFeePerGas?.Value.ToString(),
+                    gasPrice = this._forwardLocalGasFees ? transaction.GasPrice?.Value.ToString() : null,
+                    maxFeePerGas = this._forwardLocalGasFees ? transaction.MaxFeePerGas?.Value.ToString() : null,
+                    maxPriorityFeePerGas = this._forwardLocalGasFees ? transaction.MaxPriorityFeePerGas?.Value.ToString() : null,
                     timeoutSeconds = this._timeoutSeconds,
                 }
                 : null,
@@ -271,7 +279,7 @@ public async Task<string> SignTransaction(ThirdwebTransactionInput transaction)
             throw new ArgumentNullException(nameof(transaction));
         }
 
-        object payload = new { transaction = this.ToEngineTransaction(transaction), };
+        object payload = new { transaction = this.ToEngineTransaction(transaction) };
 
         var url = $"{this._engineUrl}/backend-wallet/sign-transaction";