add Optional Authentication mode

this allow run managment command (after authentication) on open mmo servers (with player from external api servers)

src/CommandHandlers/ChatMessageHandler.cs

@@ -32,8 +32,10 @@ class ChatMessageHandler : CommandHandler {
     }
 
     public void Chat(Client client, string message) {
-        if (Configuration.ServerConfiguration.Authentication && client.PlayerData.DiplayName == "placeholder")
+        if (Configuration.ServerConfiguration.Authentication >= AuthenticationMode.RequiredForChat && client.PlayerData.DiplayName == "placeholder") {
+            client.Send(Utils.BuildServerSideMessage("You must be authenticated to use the chat", "Server"));
             return;
+        }
 
         client.Room.Send(Utils.BuildChatMessage(client.PlayerData.Uid, message, client.PlayerData.DiplayName), client);
 

src/CommandHandlers/LoginHandler.cs

@@ -72,9 +72,10 @@ class LoginHandler : CommandHandler
     }
 
     private bool ValidToken(Client client) {
-        if (!Configuration.ServerConfiguration.Authentication ||
+        if (Configuration.ServerConfiguration.Authentication == AuthenticationMode.Disabled ||
             (client.PlayerData.UNToken == Configuration.ServerConfiguration.BypassToken && !string.IsNullOrEmpty(Configuration.ServerConfiguration.BypassToken)))
             return true;
+
         try {
             HttpClient httpClient = new();
             var content = new FormUrlEncodedContent(
@@ -87,7 +88,7 @@ class LoginHandler : CommandHandler
             string? responseString = response.Content.ReadAsStringAsync().Result;
 
             if (response.StatusCode != System.Net.HttpStatusCode.OK)
-                return false;
+                throw new Exception($"Response status code {response.StatusCode}");
             if (responseString == null)
                 throw new Exception("Response string null");
 
@@ -100,6 +101,6 @@ class LoginHandler : CommandHandler
         } catch (Exception ex) {
             Console.WriteLine($"Authentication exception IID: {client.ClientID} - {ex}");
         }
-        return false;
+        return Configuration.ServerConfiguration.Authentication != AuthenticationMode.Required; // return true on auth err if not Required mode
     }
 }

src/Core/Configuration.cs

@@ -21,7 +21,7 @@ internal static class Configuration {
 
         ServerConfiguration = serverConfiguration;
         if (string.IsNullOrEmpty(ServerConfiguration.ApiUrl)) {
-            ServerConfiguration.Authentication = false;
+            ServerConfiguration.Authentication = AuthenticationMode.Disabled;
         }
     }
 }
@@ -37,7 +37,11 @@ internal sealed class ServerConfiguration {
     public int PingDelay { get; set; } = 17;
     public bool EnableChat { get; set; } = true;
     public bool AllowChaos { get; set; } = false;
-    public bool Authentication { get; set; } = false;
+    public AuthenticationMode Authentication { get; set; } = AuthenticationMode.Disabled;
     public string ApiUrl { get; set; } = "";
     public string BypassToken { get; set; } = "";
 }
+
+public enum AuthenticationMode {
+    Disabled, Optional, RequiredForChat, Required
+}

src/Management/ManagementCommandProcessor.cs

@@ -13,7 +13,7 @@ public class ManagementCommandProcessor {
     static bool initialized = false;
 
     public static void Initialize() {
-        if (!Configuration.ServerConfiguration.Authentication)
+        if (Configuration.ServerConfiguration.Authentication == AuthenticationMode.Disabled)
             return;
         commands.Clear();
         var handlerTypes = Assembly.GetExecutingAssembly().GetTypes()
@@ -28,7 +28,7 @@ public class ManagementCommandProcessor {
     }
 
     public static bool ProcessCommand(string message, Client client) {
-        if (!Configuration.ServerConfiguration.Authentication || !initialized)
+        if (!initialized)
             return false;
         if (!message.StartsWith("::") || message.Length < 3)
             return false;

src/appsettings.json

@@ -25,6 +25,19 @@
     "RacingMinPlayers": 2,
 
     "// AllowChaos": "disable server side exploit protection",
-    "AllowChaos": false
+    "AllowChaos": false,
+
+    "// Authentication": "Player authentication mode: Disabled, Optional, RequiredForChat, Required",
+    "// Authentication Disabled": "authentication is disabled, anyone can connect to mmo",
+    "// Authentication Optional": "authentication is required only for moderation activities",
+    "// Authentication RequiredForChat": "authentication is required only for moderation activities and using chat (if chat is enabled)",
+    "// Authentication Required": "authentication is required to connect to mmo",
+    "Authentication": "Disabled",
+
+    "// ApiUrl": "SoDOff API server URL for authentication calls",
+    "ApiUrl": "http://localhost:5000",
+
+    "// BypassToken": "Token allowed to connect without authentication",
+    "BypassToken": ""
   }
 }