Fixes client having authority over rules popup cvars (#28655)

* Fixes client having authority over rules popup cvars

* Delete duplicate migration

* Pre-update

* Post-update

Content.Server/Info/RulesManager.cs

@@ -0,0 +1,44 @@
+using System.Net;
+using Content.Server.Database;
+using Content.Shared.CCVar;
+using Content.Shared.Info;
+using Robust.Shared.Configuration;
+using Robust.Shared.Network;
+
+namespace Content.Server.Info;
+
+public sealed class RulesManager
+{
+    [Dependency] private readonly IServerDbManager _dbManager = default!;
+    [Dependency] private readonly INetManager _netManager = default!;
+    [Dependency] private readonly IConfigurationManager _cfg = default!;
+
+    private static DateTime LastValidReadTime => DateTime.UtcNow - TimeSpan.FromDays(60);
+
+    public void Initialize()
+    {
+        _netManager.Connected += OnConnected;
+        _netManager.RegisterNetMessage<ShowRulesPopupMessage>();
+        _netManager.RegisterNetMessage<RulesAcceptedMessage>(OnRulesAccepted);
+    }
+
+    private async void OnConnected(object? sender, NetChannelArgs e)
+    {
+        if (IPAddress.IsLoopback(e.Channel.RemoteEndPoint.Address) && _cfg.GetCVar(CCVars.RulesExemptLocal))
+            return;
+
+        var lastRead = await _dbManager.GetLastReadRules(e.Channel.UserId);
+        if (lastRead > LastValidReadTime)
+            return;
+
+        var message = new ShowRulesPopupMessage();
+        message.PopupTime = _cfg.GetCVar(CCVars.RulesWaitTime);
+        _netManager.ServerSendMessage(message, e.Channel);
+    }
+
+    private async void OnRulesAccepted(RulesAcceptedMessage message)
+    {
+        var date = DateTime.UtcNow;
+        await _dbManager.SetLastReadRules(message.MsgChannel.UserId, date);
+    }
+}