Add DisableServerAuthority to ModFlags (#78)

Reactor.Networking.Shared/ModFlags.cs

@@ -27,4 +27,9 @@ public enum ModFlags : ushort
     /// Requires the host of the lobby to have the mod.
     /// </summary>
     RequireOnHost = 1 << 2,
+
+    /// <summary>
+    /// Notifies the game server that the host has authority over game logic.
+    /// </summary>
+    DisableServerAuthority = 1 << 3,
 }

Reactor/Networking/ModList.cs

@@ -39,7 +39,8 @@ internal static Mod GetByPluginType(Type pluginType)
         return _modByPluginType[pluginType];
     }
 
-    internal static bool IsAnyModIsRequiredOnAllClients { get; private set; }
+    internal static bool IsAnyModRequiredOnAllClients { get; private set; }
+    internal static bool IsAnyModDisableServerAuthority { get; private set; }
 
     private static readonly Dictionary<uint, Mod> _modByNetId = new();
     private static readonly Dictionary<Mod, uint> _netIdByMod = new();
@@ -115,7 +116,8 @@ private static void Refresh()
             netId++;
         }
 
-        IsAnyModIsRequiredOnAllClients = Current.Any(m => m.IsRequiredOnAllClients);
+        IsAnyModRequiredOnAllClients = Current.Any(m => m.IsRequiredOnAllClients);
+        IsAnyModDisableServerAuthority = Current.Any(m => (m.Flags & ModFlags.DisableServerAuthority) != 0);
 
         var debug = new StringBuilder("Mod list:");
         foreach (var mod in Current)

Reactor/Networking/Patches/ClientPatches.cs

@@ -84,7 +84,7 @@ public static bool Prefix(InnerNetClient._HandleGameDataInner_d__39 __instance,
 
                         if (innerNetClient.AmHost)
                         {
-                            if (reactorClientData == null && ModList.IsAnyModIsRequiredOnAllClients)
+                            if (reactorClientData == null && ModList.IsAnyModRequiredOnAllClients)
                             {
                                 Warning("Kicking " + clientData.PlayerName + " for not having Reactor installed");
 

Reactor/Networking/Patches/HttpPatches.cs

@@ -103,7 +103,7 @@ private static class GameStartManagerPatch
         public static void Postfix(GameStartManager __instance)
         {
             if (AmongUsClient.Instance.NetworkMode != NetworkModes.OnlineGame) return;
-            if (ModList.IsAnyModIsRequiredOnAllClients && !IsCurrentRegionModded())
+            if (ModList.IsAnyModRequiredOnAllClients && !IsCurrentRegionModded())
             {
                 Warning("Vanilla region, locking public toggle");
 

Reactor/Patches/Miscellaneous/DisableServerAuthorityPatch.cs

@@ -0,0 +1,41 @@
+using HarmonyLib;
+using Reactor.Networking;
+
+namespace Reactor.Patches.Miscellaneous;
+
+[HarmonyPatch]
+internal static class DisableServerAuthorityPatch
+{
+    private const int DisableServerAuthorityFlag = 25;
+
+    public static bool Enabled => ModList.IsAnyModDisableServerAuthority || ReactorConfig.ForceDisableServerAuthority.Value;
+
+    [HarmonyPatch(typeof(Constants), nameof(Constants.GetBroadcastVersion))]
+    [HarmonyPostfix]
+    public static void GetBroadcastVersionPatch(ref int __result)
+    {
+        if (!Enabled) return;
+        if (AmongUsClient.Instance.NetworkMode != NetworkModes.OnlineGame) return;
+
+        Debug("Sending the DisableServerAuthority flag");
+
+        var revision = __result % 50;
+        if (revision < DisableServerAuthorityFlag)
+        {
+            __result += DisableServerAuthorityFlag;
+        }
+    }
+
+    [HarmonyPatch(typeof(Constants), nameof(Constants.IsVersionModded))]
+    [HarmonyPrefix]
+    public static bool IsVersionModdedPatch(ref bool __result)
+    {
+        if (Enabled)
+        {
+            __result = true;
+            return false;
+        }
+
+        return true;
+    }
+}

Reactor/ReactorConfig.cs

@@ -6,7 +6,10 @@ internal static class ReactorConfig
 {
     public const string FeaturesSection = "Features";
 
+    public static ConfigEntry<bool> ForceDisableServerAuthority { get; private set; } = null!;
+
     public static void Bind(ConfigFile config)
     {
+        ForceDisableServerAuthority = config.Bind(FeaturesSection, nameof(ForceDisableServerAuthority), false, "Enables the DisableServerAuthority flag even when no mods declare it");
     }
 }