feat(launcher): warn when BepInEx mods are detected before starting (SubnauticaNitrox#2569)

Co-authored-by: Measurity <1107063+Measurity@users.noreply.github.com>

Author: mattwolf0

Nitrox.Launcher/Models/Utils/GameInspect.cs

@@ -1,10 +1,11 @@
 using System;
+using System.Collections.Generic;
 using System.IO;
+using System.Linq;
 using System.Threading.Tasks;
 using Nitrox.Launcher.Models.Services;
 using Nitrox.Launcher.ViewModels;
 using Nitrox.Model.Core;
-using Nitrox.Model.Helper;
 using Nitrox.Model.Logger;
 using Nitrox.Model.Platforms.OS.Shared;
 
@@ -20,7 +21,7 @@ public static async Task<bool> IsOutdatedGameAndNotify(string gameInstallDir, Di
         try
         {
             ArgumentException.ThrowIfNullOrWhiteSpace(gameInstallDir);
-            
+
             string gameVersionFile = Path.Combine(gameInstallDir, GameInfo.Subnautica.DataFolder, "StreamingAssets", "SNUnmanagedData", "plastic_status.ignore");
             if (int.TryParse(await File.ReadAllTextAsync(gameVersionFile), out int gameVersion) && gameVersion < NitroxEnvironment.GameMinimumVersion)
             {
@@ -57,8 +58,40 @@ public static bool WarnIfGameProcessExists(GameInfo game)
         {
             return false;
         }
-        
         LauncherNotifier.Warning($"An instance of {game.FullName} is already running");
         return true;
     }
+
+    public static void WarnIfBepInExMods(string gameDir)
+    {
+        if (string.IsNullOrWhiteSpace(gameDir) || !Directory.Exists(gameDir))
+        {
+            return;
+        }
+        string bepRoot = Path.Combine(gameDir, "BepInEx");
+        if (!Directory.Exists(bepRoot))
+        {
+            return;
+        }
+
+        int modDllCount = GetDllPaths(Path.Combine(bepRoot, "plugins")).Count();
+        modDllCount += GetDllPaths(Path.Combine(bepRoot, "patchers")).Count();
+        if (modDllCount > 0)
+        {
+            Log.Warn($"BepInEx plugins detected: {modDllCount}");
+            LauncherNotifier.Warning($"BepInEx mod(s) were detected ({modDllCount}). Nitrox multiplayer does not support mods and they may cause instability.");
+        }
+
+        static IEnumerable<string> GetDllPaths(string path)
+        {
+            try
+            {
+                return Directory.EnumerateFiles(path, "*.dll", SearchOption.AllDirectories);
+            }
+            catch (IOException)
+            {
+                return [];
+            }
+        }
+    }
 }

Nitrox.Launcher/ViewModels/LaunchGameViewModel.cs

@@ -158,6 +158,7 @@ private async Task StartMultiplayerAsync(string[]? args = null)
                     Log.Warn("Seems like QModManager is installed");
                     LauncherNotifier.Warning("QModManager Detected in the game folder");
                 }
+                GameInspect.WarnIfBepInExMods(NitroxUser.GamePath);
 
                 return true;
             });