Prevent firework abuse

src/main/java/ac/grim/grimac/events/packets/PacketEntityReplication.java

@@ -1,5 +1,6 @@
 package ac.grim.grimac.events.packets;
 
+import ac.grim.grimac.GrimAPI;
 import ac.grim.grimac.checks.Check;
 import ac.grim.grimac.checks.type.PacketCheck;
 import ac.grim.grimac.player.GrimPlayer;
@@ -47,6 +48,9 @@ public class PacketEntityReplication extends Check implements PacketCheck {
     // Another valid solution is to simply spam more transactions, but let's not waste bandwidth.
     private final List<Integer> despawnedEntitiesThisTransaction = new ArrayList<>();
 
+    // Maximum ping when a firework boost is removed from the player.
+    private final int maxFireworkBoostPing = GrimAPI.INSTANCE.getConfigManager().getConfig().getIntElse("max-ping-firework-boost", 1000);
+
     public PacketEntityReplication(GrimPlayer player) {
         super(player);
     }
@@ -300,12 +304,26 @@ public void onPacketSend(PacketSendEvent event) {
                 }
             }
 
-            player.latencyUtils.addRealTimeTask(player.lastTransactionSent.get() + 1, () -> {
+            final int destroyTransaction = player.lastTransactionSent.get() + 1;
+            player.latencyUtils.addRealTimeTask(destroyTransaction, () -> {
                 for (int integer : destroyEntityIds) {
                     player.compensatedEntities.removeEntity(integer);
                     player.compensatedFireworks.removeFirework(integer);
                 }
             });
+
+            // Don't let the player freeze transactions to keep the firework boost velocity + uncertainty
+            // Also generally prevents people with high ping gaining too high an advantage in firework use
+            player.runNettyTaskInMs(() -> {
+                if (player.lastTransactionReceived.get() >= destroyTransaction) return;
+                for (int entityID : destroyEntityIds) {
+                    // If the player has a firework boosting them, setback
+                    if (player.compensatedFireworks.hasFirework(entityID)) {
+                        player.getSetbackTeleportUtil().executeViolationSetback();
+                        break;
+                    }
+                }
+            }, maxFireworkBoostPing);
         }
     }
 

src/main/java/ac/grim/grimac/utils/latency/CompensatedFireworks.java

@@ -4,13 +4,15 @@
 import ac.grim.grimac.checks.type.PostPredictionCheck;
 import ac.grim.grimac.player.GrimPlayer;
 import ac.grim.grimac.utils.anticheat.update.PredictionComplete;
-import it.unimi.dsi.fastutil.ints.IntArrayList;
-import it.unimi.dsi.fastutil.ints.IntList;
+
+import java.util.HashSet;
+import java.util.Set;
 
 public class CompensatedFireworks extends Check implements PostPredictionCheck {
+
     // As this is sync to one player, this does not have to be concurrent
-    IntList activeFireworks = new IntArrayList();
-    IntList fireworksToRemoveNextTick = new IntArrayList();
+    private final Set<Integer> activeFireworks = new HashSet<>();
+    private final Set<Integer> fireworksToRemoveNextTick = new HashSet<>();
 
     public CompensatedFireworks(GrimPlayer player) {
         super(player);
@@ -24,6 +26,10 @@ public void onPredictionComplete(final PredictionComplete predictionComplete) {
         fireworksToRemoveNextTick.clear();
     }
 
+    public boolean hasFirework(int entityId) {
+        return activeFireworks.contains(entityId);
+    }
+
     public void addNewFirework(int entityID) {
         activeFireworks.add(entityID);
     }

src/main/resources/config/de.yml

@@ -175,4 +175,8 @@ packet-spam-threshold: 100
 # Dies liegt daran, dass Grim derzeit fliegende Spieler nicht überprüft.
 max-ping-out-of-flying: 1000
 
+# Maximum ping when a firework boost is removed from the player.
+# This prevents high latency players from being able to use 1 firework boost with an elytra forever.
+max-ping-firework-boost: 1000
+
 config-version: 9

src/main/resources/config/en.yml

@@ -178,4 +178,8 @@ packet-spam-threshold: 100
 # This is due to Grim not currently checking flying players
 max-ping-out-of-flying: 1000
 
+# Maximum ping when a firework boost is removed from the player.
+# This prevents high latency players from being able to use 1 firework boost with an elytra forever.
+max-ping-firework-boost: 1000
+
 config-version: 9

src/main/resources/config/es.yml

@@ -180,4 +180,8 @@ packet-spam-threshold: 100
 # Esto se debe a que Grim actualmente no revisa a los jugadores que están volando.
 max-ping-out-of-flying: 1000
 
+# Maximum ping when a firework boost is removed from the player.
+# This prevents high latency players from being able to use 1 firework boost with an elytra forever.
+max-ping-firework-boost: 1000
+
 config-version: 9

src/main/resources/config/fr.yml

@@ -175,4 +175,8 @@ packet-spam-threshold: 100
 # Cela est dû au fait que Grim ne vérifie pas actuellement les joueurs en vol.
 max-ping-out-of-flying: 1000
 
+# Maximum ping when a firework boost is removed from the player.
+# This prevents high latency players from being able to use 1 firework boost with an elytra forever.
+max-ping-firework-boost: 1000
+
 config-version: 9

src/main/resources/config/it.yml

@@ -141,13 +141,22 @@ exploit:
   # Distanza per controllare i ghost blocks
   distance-to-check-if-ghostblocks: 2
 
+# Enable logging plugins who have injected into netty on join to debug compatibility issues
 debug-pipeline-on-join: false
 
+# Enables experimental checks
 experimental-checks: false
 
+# Grim sometimes cancels illegal packets such as with timer, after X packets in a second cancelled, when should
+# we simply kick the player? This is required as some packet limiters don't count packets cancelled by grim.
 packet-spam-threshold: 100
 
-max-ping-out-of-flying: 1000
 # Grim is able to enforce that a player set out of flying state cannot have more than X milliseconds of ping
 # This is due to Grim not currently checking flying players
-max-ping-out-of-flying: 1000
+max-ping-out-of-flying: 1000
+
+# Maximum ping when a firework boost is removed from the player.
+# This prevents high latency players from being able to use 1 firework boost with an elytra forever.
+max-ping-firework-boost: 1000
+
+config-version: 9

src/main/resources/config/nl.yml

@@ -178,4 +178,8 @@ packet-spam-threshold: 100
 # Dit komt doordat Grim momenteel vliegende spelers niet controleert
 max-ping-out-of-flying: 1000
 
+# Maximum ping when a firework boost is removed from the player.
+# This prevents high latency players from being able to use 1 firework boost with an elytra forever.
+max-ping-firework-boost: 1000
+
 config-version: 9

src/main/resources/config/pt.yml

@@ -185,4 +185,8 @@ packet-spam-threshold: 100
 # Isso ocorre porque o Grim atualmente não verifica os jogadores que estão voando.
 max-ping-out-of-flying: 1000
 
+# Maximum ping when a firework boost is removed from the player.
+# This prevents high latency players from being able to use 1 firework boost with an elytra forever.
+max-ping-firework-boost: 1000
+
 config-version: 9

src/main/resources/config/ru.yml

@@ -174,4 +174,8 @@ packet-spam-threshold: 100
 # Это связано с тем, что Грим в настоящее время не проверяет летающих игроков.
 max-ping-out-of-flying: 1000
 
+# Maximum ping when a firework boost is removed from the player.
+# This prevents high latency players from being able to use 1 firework boost with an elytra forever.
+max-ping-firework-boost: 1000
+
 config-version: 9

src/main/resources/config/zh.yml

@@ -172,4 +172,8 @@ packet-spam-threshold: 100
 # Grim 能够强制执行一个规则：被设置为非飞行状态的玩家的 ping 值不能超过 X 毫秒。这是因为 Grim 目前不检查处于飞行状态的玩家。
 max-ping-out-of-flying: 1000
 
+# Maximum ping when a firework boost is removed from the player.
+# This prevents high latency players from being able to use 1 firework boost with an elytra forever.
+max-ping-firework-boost: 1000
+
 config-version: 9