Added untested rate limits

core/src/mindustry/core/NetClient.java

@@ -160,7 +160,7 @@ public class NetClient implements ApplicationListener{
             throw new ValidateException(player, "Player has sent a message above the text limit.");
         }
 
-        String original = message;
+        Events.fire(new PlayerChatEvent(player, message));
 
         //check if it's a command
         CommandResponse response = netServer.clientCommands.handleMessage(message, player);
@@ -197,8 +197,6 @@ public class NetClient implements ApplicationListener{
                 player.sendMessage(text);
             }
         }
-
-        Events.fire(new PlayerChatEvent(player, message, original));
     }
 
     public static String colorizeName(int id, String name){

core/src/mindustry/core/NetServer.java

@@ -35,7 +35,7 @@ import static mindustry.Vars.*;
 
 public class NetServer implements ApplicationListener{
     private final static int maxSnapshotSize = 430, timerBlockSync = 0;
-    private final static float serverSyncTime = 12, kickDuration = 30 * 1000, blockSyncTime = 60 * 8;
+    private final static float serverSyncTime = 12, blockSyncTime = 60 * 8;
     private final static Vec2 vector = new Vec2();
     private final static Rect viewport = new Rect();
     /** If a player goes away of their server-side coordinates by this distance, they get teleported back. */
@@ -115,7 +115,7 @@ public class NetServer implements ApplicationListener{
                 return;
             }
 
-            if(Time.millis() - info.lastKicked < kickDuration){
+            if(Time.millis() < info.lastKicked){
                 con.kick(KickReason.recentKick);
                 return;
             }

core/src/mindustry/game/EventType.java

@@ -64,13 +64,10 @@ public class EventType{
     public static class PlayerChatEvent{
         public final Player player;
         public final String message;
-        /** The original, unfiltered message. */
-        public final String originalMessage;
 
-        public PlayerChatEvent(Player player, String message, String originalMessage){
+        public PlayerChatEvent(Player player, String message){
             this.player = player;
             this.message = message;
-            this.originalMessage = originalMessage;
         }
     }
 

core/src/mindustry/net/Administration.java

@@ -2,6 +2,7 @@ package mindustry.net;
 
 import arc.*;
 import arc.struct.*;
+import arc.util.*;
 import arc.util.ArcAnnotate.*;
 import mindustry.*;
 import mindustry.annotations.Annotations.*;
@@ -19,6 +20,38 @@ public class Administration{
 
     public Administration(){
         load();
+
+        //anti-spam
+        addChatFilter((player, message) -> {
+            long resetTime = Config.messageRateLimit.num() * 1000;
+            if(Config.antiSpam.bool() && !player.isLocal && !player.isAdmin){
+                //prevent people from spamming messages quickly
+                if(resetTime > 0 && Time.timeSinceMillis(player.getInfo().lastMessageTime) < resetTime){
+                    //supress message
+                    player.sendMessage("[scarlet]You may only send messages every " + Config.messageRateLimit.num() + " seconds.");
+                    player.getInfo().messageInfractions ++;
+                    //kick player for spamming and prevent connection if they've done this several times
+                    if(player.getInfo().messageInfractions >= Config.messageSpamKick.num() && Config.messageSpamKick.num() != 0){
+                        player.con.kick("You have been kicked for spamming.", 1000 * 60 * 2);
+                    }
+                    player.lastText = message;
+                    return null;
+                }else{
+                    player.getInfo().messageInfractions = 0;
+                }
+
+                //prevent players from sending the same message twice in the span of 50 seconds
+                if(message.equals(player.lastText) && Time.timeSinceMillis(player.getInfo().lastMessageTime) < 1000 * 50){
+                    player.sendMessage("[scarlet]You may not send the same message twice.");
+                    return null;
+                }
+
+                player.lastText = message;
+                player.getInfo().lastMessageTime = Time.millis();
+            }
+
+            return message;
+        });
     }
 
     /** Adds a chat filter. This will transform the chat messages of every player.
@@ -326,6 +359,9 @@ public class Administration{
         crashReport("Whether to send crash reports.", false, "crashreport"),
         logging("Whether to log everything to files.", true),
         strict("Whether strict mode is on - corrects positions and prevents duplicate UUIDs.", true),
+        antiSpam("Whether spammers are automatically kicked and rate-limited.", true),
+        messageRateLimit("Message rate limit in seconds. 0 to disable.", 0),
+        messageSpamKick("How many times a player must send a message before the cooldown to get kicked. 0 to disable.", 3),
         socketInput("Allows a local application to control this server through a local TCP socket.", false, "socket", () -> Events.fire(Trigger.socketConfigChanged)),
         socketInputPort("The port for socket input.", 6859, () -> Events.fire(Trigger.socketConfigChanged)),
         socketInputAddress("The bind address for socket input.", "localhost", () -> Events.fire(Trigger.socketConfigChanged)),
@@ -402,7 +438,11 @@ public class Administration{
         public int timesKicked;
         public int timesJoined;
         public boolean banned, admin;
-        public long lastKicked; //last kicked timestamp
+        public long lastKicked; //last kicked time to expiration
+
+        public transient long lastMessageTime;
+        public transient String lastSentMessage;
+        public transient int messageInfractions;
 
         PlayerInfo(String id){
             this.id = id;

core/src/mindustry/net/NetConnection.java

@@ -37,7 +37,7 @@ public abstract class NetConnection{
         if(player != null && (reason == KickReason.kick || reason == KickReason.banned || reason == KickReason.vote) && player.uuid != null){
             PlayerInfo info = netServer.admins.getInfo(player.uuid);
             info.timesKicked++;
-            info.lastKicked = Math.max(Time.millis(), info.lastKicked);
+            info.lastKicked = Math.max(Time.millis() + 30 * 1000, info.lastKicked);
         }
 
         Call.onKick(this, reason);
@@ -49,12 +49,17 @@ public abstract class NetConnection{
 
     /** Kick with an arbitrary reason. */
     public void kick(String reason){
+        kick(reason, 30 * 1000);
+    }
+
+    /** Kick with an arbitrary reason, and a kick duration in milliseconds. */
+    public void kick(String reason, int kickDuration){
         Log.info("Kicking connection {0}; Reason: {1}", address, reason.replace("\n", " "));
 
         if(player != null  && player.uuid != null){
             PlayerInfo info = netServer.admins.getInfo(player.uuid);
             info.timesKicked++;
-            info.lastKicked = Math.max(Time.millis(), info.lastKicked);
+            info.lastKicked = Math.max(Time.millis() + kickDuration, info.lastKicked);
         }
 
         Call.onKick(this, reason);