Kicking AFK players (#12812)

* Kicking AFK players

* Set correct CCvar values

Content.Server/Afk/AFKSystem.cs

@@ -1,5 +1,6 @@
 using System.Linq;
 using Content.Server.Afk.Events;
+using Content.Server.Chat.Managers;
 using Content.Server.GameTicking;
 using Content.Shared.CCVar;
 using Robust.Server.Player;
@@ -20,17 +21,20 @@ public sealed class AFKSystem : EntitySystem
     [Dependency] private readonly IPlayerManager _playerManager = default!;
     [Dependency] private readonly IGameTiming _timing = default!;
     [Dependency] private readonly GameTicker _ticker = default!;
+    [Dependency] private readonly IChatManager _chatManager = default!;
 
     private float _checkDelay;
+    private float _kickDelay;
     private TimeSpan _checkTime;
 
-    private readonly HashSet<IPlayerSession> _afkPlayers = new();
+    private readonly Dictionary<IPlayerSession, TimeSpan> _afkPlayers = new();
 
     public override void Initialize()
     {
         base.Initialize();
         _playerManager.PlayerStatusChanged += OnPlayerChange;
         _configManager.OnValueChanged(CCVars.AfkTime, SetAfkDelay, true);
+        _configManager.OnValueChanged(CCVars.AfkKickTime, SetAfkKickDelay, true);
     }
 
     private void SetAfkDelay(float obj)
@@ -38,6 +42,11 @@ public sealed class AFKSystem : EntitySystem
         _checkDelay = obj;
     }
 
+    private void SetAfkKickDelay(float obj)
+    {
+        _kickDelay = obj;
+    }
+
     private void OnPlayerChange(object? sender, SessionStatusEventArgs e)
     {
         switch (e.NewStatus)
@@ -54,6 +63,7 @@ public sealed class AFKSystem : EntitySystem
         _afkPlayers.Clear();
         _playerManager.PlayerStatusChanged -= OnPlayerChange;
         _configManager.UnsubValueChanged(CCVars.AfkTime, SetAfkDelay);
+        _configManager.UnsubValueChanged(CCVars.AfkKickTime, SetAfkKickDelay);
     }
 
     public override void Update(float frameTime)
@@ -78,18 +88,25 @@ public sealed class AFKSystem : EntitySystem
             var pSession = (IPlayerSession) session;
             var isAfk = _afkManager.IsAfk(pSession);
 
-            if (isAfk && _afkPlayers.Add(pSession))
+            if (isAfk && _afkPlayers.TryAdd(pSession, _timing.CurTime))
             {
                 var ev = new AFKEvent(pSession);
                 RaiseLocalEvent(ref ev);
-                continue;
+                
+                _chatManager.DispatchServerMessage(pSession, Loc.GetString("afk-system-kick-warning"));
             }
 
             if (!isAfk && _afkPlayers.Remove(pSession))
             {
                 var ev = new UnAFKEvent(pSession);
                 RaiseLocalEvent(ref ev);
-                continue;
+            }
+
+            if (isAfk &&
+                _afkPlayers.TryGetValue(pSession, out var startAfkTime) &&
+                _timing.CurTime - startAfkTime >= TimeSpan.FromSeconds(_kickDelay))
+            {
+                pSession.ConnectedClient.Disconnect( Loc.GetString("afk-system-kick-reason"));
             }
         }
     }

Content.Shared/CCVar/CCVars.cs

@@ -1149,6 +1149,12 @@ namespace Content.Shared.CCVar
         public static readonly CVarDef<float> AfkTime =
             CVarDef.Create("afk.time", 60f, CVar.SERVERONLY);
 
+        /// <summary>
+        /// How long seconds a client can go after being detected as AFK before being kicked.
+        /// </summary>
+        public static readonly CVarDef<float> AfkKickTime =
+            CVarDef.Create("afk.kick_time", 600f, CVar.SERVERONLY);
+
         /*
          * IC
          */

Resources/Locale/en-US/afk/afk.ftl

@@ -0,0 +1,2 @@
+afk-system-kick-warning = You will be kicked for being AFK soon!
+afk-system-kick-reason = You were kicked for being AFK!