✨ Add message sign to xNFT wallet adapter.

Runtime/Plugins/xNFT.jslib

@@ -35,4 +35,24 @@ mergeInto(LibraryManager.library, {
       console.error("Not running in Backpack wallet");
     }
   },
+
+  ExternSignMessageXNFT: async function (message, callback) {
+      if ('xnft' in window && window.xnft != undefined && window.xnft.solana != undefined) {
+        try {
+          const messageBase64String = UTF8ToString(message);
+          const messageBytes = Uint8Array.from(atob(messageBase64String), (c) => c.charCodeAt(0));
+          const signedMessage = await window.xnft.solana.signMessage(messageBytes);
+          console.log(signedMessage);
+          var sign = JSON.stringify(Array.from(signedMessage));
+          var lenSign = lengthBytesUTF8(sign) + 1;
+          var strPtr = _malloc(lenSign);
+          stringToUTF8(sign, strPtr, lenSign);
+          Module.dynCall_vi(callback, strPtr);
+        } catch (err) {
+          console.error(err.message);
+        }
+      } else {
+        console.error("Not running in Backpack wallet");
+      }
+    },
 });

Runtime/codebase/XNFTWallet.cs

@@ -16,6 +16,7 @@ public class XNFTWallet: WalletBase
 
         private static TaskCompletionSource<Account> _loginTaskCompletionSource;
         private static TaskCompletionSource<Transaction> _signedTransactionTaskCompletionSource;
+        private static TaskCompletionSource<byte[]> _signedMessageTaskCompletionSource;
         private static Transaction _currentTransaction;
         private static Account _account;
 
@@ -56,7 +57,9 @@ protected override Task<Transaction[]> _SignAllTransactions(Transaction[] transa
 
         public override Task<byte[]> SignMessage(byte[] message)
         {
-            throw new NotImplementedException();
+            _signedMessageTaskCompletionSource = new TaskCompletionSource<byte[]>();
+            ExternSignMessageXNFT(Convert.ToBase64String(message), OnMessageSigned);
+            return _signedMessageTaskCompletionSource.Task;
         }
 
         protected override Task<Account> _CreateAccount(string mnemonic = null, string password = null)
@@ -78,7 +81,7 @@ private static void OnXNFTConnected(string walletPubKey)
         }
 
         /// <summary>
-        /// Called from java script when the phantom wallet signed the transaction and return the signature
+        /// Called from java script when the xnft wallet signed the transaction and return the signature
         /// that we then need to put into the transaction before we send it out.
         /// </summary>
         [MonoPInvokeCallback(typeof(Action<string>))]
@@ -91,6 +94,17 @@ public static void OnTransactionSigned(string signature)
             });
             _signedTransactionTaskCompletionSource.SetResult(_currentTransaction);
         }
+
+        /// <summary>
+        /// Called from java script when the xnft wallet signed the message and return the signature.
+        /// </summary>
+        [MonoPInvokeCallback(typeof(Action<string>))]
+        public static void OnMessageSigned(string signature)
+        {
+            var signatureArray = JsonUtility.FromJson<byte[]>(signature);
+            Debug.Log("SignatureArray: " + signatureArray);
+            _signedMessageTaskCompletionSource.SetResult(signatureArray);
+        }
 
         #endregion
 
@@ -102,9 +116,13 @@ public static void OnTransactionSigned(string signature)
         [DllImport("__Internal")]
         private static extern void ExternSignTransactionXNFT(string transaction, Action<string> callback);
 
+        [DllImport("__Internal")]
+        private static extern void ExternSignMessageXNFT(string message, Action<string> callback);
+
         #else
         private static void ExternConnectXNFT(Action<string> callback){}
         private static void ExternSignTransactionXNFT(string transaction, Action<string> callback){}
+        private static void ExternSignMessageXNFT(string message, Action<string> callback){}
         #endif
     }
 }