plugins system with sample (reflection based)

plugins/sample_plugin/Plugin.cs

@@ -0,0 +1,36 @@
+using System;
+using HarmonyLib;
+
+namespace SoDOff_MMO_Plugin {
+	// all classes from SoDOff_MMO_Plugin namespace will be created on dll load
+	public class SamplePlugin1 {
+		public SamplePlugin1() {
+			Console.WriteLine("SamplePlugin1 constructor");
+			var harmony = new Harmony("SamplePlugin1");
+			harmony.PatchAll();
+		}
+	}
+	public class SamplePlugin2 {
+		public SamplePlugin2() {
+			Console.WriteLine("SamplePlugin2 constructor");
+		}
+	}
+}
+
+namespace Internal {
+	// classes from other namespace will be NOT created on dll load
+	public class SamplePlugin3 {
+		public SamplePlugin3() {
+			Console.WriteLine("SamplePlugin3 constructor");
+		}
+	}
+}
+
+
+[HarmonyPatch("ChatMessageHandler", "Chat")]
+public class ChatMessageHandler_Chat {
+    [HarmonyPrefix]
+    public static void Chat(sodoffmmo.Core.Client client, string message) {
+        Console.WriteLine($"Chat message: {message}");
+    }
+}

plugins/sample_plugin/SamplePlugin.csproj

@@ -0,0 +1,17 @@
+<Project Sdk="Microsoft.NET.Sdk">
+  <PropertyGroup>
+    <TargetFramework>net6.0</TargetFramework>
+    <AssemblyName>SamplePlugin</AssemblyName>
+    <Nullable>enable</Nullable>
+  </PropertyGroup>
+  
+  <ItemGroup>
+    <PackageReference Include="Lib.Harmony" Version="2.3.6" />
+  </ItemGroup>
+  
+  <ItemGroup>
+    <Reference Include="sodoffmmo">
+      <HintPath>../../src/bin/Debug/net6.0/sodoffmmo.dll</HintPath>
+    </Reference>
+  </ItemGroup>
+</Project>

src/Program.cs

@@ -1,11 +1,30 @@
 using sodoffmmo;
 using sodoffmmo.Core;
 using System.Net;
+using System.IO;
+using System.Reflection;
 
 Configuration.Initialize();
 
-Server server;
+string pluginsDir = Path.GetFullPath("plugins");
+Console.WriteLine($"Loading plugins from '{pluginsDir}' ...");
+List<dynamic> plugins = new();
+try {
+    foreach (var dllFile in Directory.GetFiles(pluginsDir, "*.dll")) {
+        var dll = Assembly.LoadFrom(dllFile);
+        foreach(Type type in dll.GetExportedTypes()) {
+            if (type.Namespace == "SoDOff_MMO_Plugin") {
+                Console.WriteLine($" * {type} ({Path.GetFileName(dllFile)})");
+                plugins.Add(Activator.CreateInstance(type));
+            }
+        }
+    }
+} catch (System.IO.DirectoryNotFoundException) {
+    Console.WriteLine(" - Skipped: plugins directory do not exist");
+}
 
+Console.WriteLine($"Starting MMO server ...");
+Server server;
 if (String.IsNullOrEmpty(Configuration.ServerConfiguration.ListenIP) || Configuration.ServerConfiguration.ListenIP == "*") {
     server = new(
         IPAddress.IPv6Any,