Kick mines (real) (#8056)

Co-authored-by: metalgearsloth <comedian_vs_clown@hotmail.com>

Content.Server/GhostKick/GhostKickManager.cs

@@ -0,0 +1,76 @@
+using Content.Server.Administration;
+using Content.Shared.Administration;
+using Content.Shared.GhostKick;
+using Robust.Server.Player;
+using Robust.Shared.Console;
+using Robust.Shared.Network;
+using Robust.Shared.Timing;
+
+namespace Content.Server.GhostKick;
+
+// Handles logic for "ghost kicking".
+// Basically we boot the client off the server without telling them, so the game shits itself.
+// Hilariously isn't it?
+
+public sealed class GhostKickManager
+{
+    [Dependency] private readonly IServerNetManager _netManager = default!;
+
+    public void Initialize()
+    {
+        _netManager.RegisterNetMessage<MsgGhostKick>();
+    }
+
+    public void DoDisconnect(INetChannel channel, string reason)
+    {
+        Timer.Spawn(TimeSpan.FromMilliseconds(100), () =>
+        {
+            if (!channel.IsConnected)
+                return;
+
+            // We do this so the client can set net.fakeloss 1 before getting ghosted.
+            // This avoids it spamming messages at the server that cause warnings due to unconnected client.
+            channel.SendMessage(new MsgGhostKick());
+
+            Timer.Spawn(TimeSpan.FromMilliseconds(100), () =>
+            {
+                if (!channel.IsConnected)
+                    return;
+
+                // Actually just remove the client entirely.
+                channel.Disconnect(reason, false);
+            });
+        });
+    }
+}
+
+[AdminCommand(AdminFlags.Admin)]
+public sealed class GhostKickCommand : IConsoleCommand
+{
+    public string Command => "ghostkick";
+    public string Description => "Kick a client from the server as if their network just dropped.";
+    public string Help => "Usage: ghostkick <Player> [Reason]";
+
+    public void Execute(IConsoleShell shell, string argStr, string[] args)
+    {
+        if (args.Length < 1)
+        {
+            shell.WriteError("Need at least one argument");
+            return;
+        }
+
+        var playerName = args[0];
+        var reason = args.Length > 1 ? args[1] : "Ghost kicked by console";
+
+        var players = IoCManager.Resolve<IPlayerManager>();
+        var ghostKick = IoCManager.Resolve<GhostKickManager>();
+
+        if (!players.TryGetSessionByUsername(playerName, out var player))
+        {
+            shell.WriteError($"Unable to find player: '{playerName}'.");
+            return;
+        }
+
+        ghostKick.DoDisconnect(player.ConnectedClient, reason);
+    }
+}