[Add]: Plugin Sign Client

src/Neo/Sign/SignException.cs

@@ -22,6 +22,7 @@ public class SignException : Exception
         /// Initializes a new instance of the <see cref="SignException"/> class.
         /// </summary>
         /// <param name="message">The message that describes the error.</param>
-        public SignException(string message) : base(message) { }
+        /// <param name="cause">The cause of the exception.</param>
+        public SignException(string message, Exception cause = null) : base(message, cause) { }
     }
 }

src/Plugins/DBFTPlugin/Consensus/ConsensusContext.MakePayload.cs

@@ -14,7 +14,6 @@
 using Neo.Network.P2P.Payloads;
 using Neo.Plugins.DBFTPlugin.Messages;
 using Neo.Plugins.DBFTPlugin.Types;
-using Neo.Sign;
 using System;
 using System.Buffers.Binary;
 using System.Collections.Generic;

src/Plugins/SignClient/Settings.cs

@@ -0,0 +1,55 @@
+// Copyright (C) 2015-2025 The Neo Project.
+//
+// Settings.cs file belongs to the neo project and is free
+// software distributed under the MIT software license, see the
+// accompanying file LICENSE in the main directory of the
+// repository or http://www.opensource.org/licenses/mit-license.php
+// for more details.
+//
+// Redistribution and use in source and binary forms with or without
+// modifications are permitted.
+
+using Microsoft.Extensions.Configuration;
+
+namespace Neo.Plugins.SignClient
+{
+    public class Settings : PluginSettings
+    {
+        public const string SectionName = "PluginConfiguration";
+        private const string DefaultEndpoint = "http://127.0.0.1:9991";
+
+        /// <summary>
+        /// The name of the sign client(i.e. Signer).
+        /// </summary>
+        public readonly string Name;
+
+        /// <summary>
+        /// The host of the sign client(i.e. Signer).
+        /// </summary>
+        public readonly string Endpoint;
+
+        public Settings(IConfigurationSection section) : base(section)
+        {
+            Name = section.GetValue("Name", "SignClient");
+
+            // Only support local host at present, so host always is "127.0.0.1" or "::1" now.
+            Endpoint = section.GetValue("Endpoint", DefaultEndpoint);
+        }
+
+        public static Settings Default
+        {
+            get
+            {
+                var section = new ConfigurationBuilder()
+                    .AddInMemoryCollection(new Dictionary<string, string?>
+                    {
+                        [SectionName + ":Name"] = "SignClient",
+                        [SectionName + ":Endpoint"] = DefaultEndpoint
+                    })
+                    .Build()
+                    .GetSection(SectionName);
+                return new Settings(section);
+            }
+        }
+    }
+}