From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Cryptite <cryptite@gmail.com>
Date: Mon, 10 Apr 2023 08:47:43 -0500
Subject: [PATCH] Add PlayerPreChunkLoadEvent


diff --git a/src/main/java/io/papermc/paper/chunk/PlayerChunkLoader.java b/src/main/java/io/papermc/paper/chunk/PlayerChunkLoader.java
index e77972c4c264100ffdd824bfa2dac58dbbc6d678..5b32567bcf532994a31f184743cf42f4ea0113a4 100644
--- a/src/main/java/io/papermc/paper/chunk/PlayerChunkLoader.java
+++ b/src/main/java/io/papermc/paper/chunk/PlayerChunkLoader.java
@@ -787,7 +787,7 @@ public final class PlayerChunkLoader {
         // warning: modifications of this field must be aware that the loadQueue inside PlayerChunkLoader uses this field
         // in a comparator!
         protected final ArrayDeque<ChunkPriorityHolder> loadQueue = new ArrayDeque<>();
-        protected final LongOpenHashSet sentChunks = new LongOpenHashSet();
+        public final LongOpenHashSet sentChunks = new LongOpenHashSet(); // Slice - public
         protected final LongOpenHashSet chunksToBeSent = new LongOpenHashSet();
 
         protected final TreeSet<ChunkPriorityHolder> sendQueue = new TreeSet<>((final ChunkPriorityHolder p1, final ChunkPriorityHolder p2) -> {
@@ -871,7 +871,14 @@ public final class PlayerChunkLoader {
         }
 
         public void sendChunk(final int chunkX, final int chunkZ, final Runnable onChunkSend) {
-            if (this.sentChunks.add(CoordinateUtils.getChunkKey(chunkX, chunkZ))) {
+            // Slice start
+            if (!new io.papermc.paper.event.packet.PlayerPreChunkLoadEvent(this.player.getBukkitEntity().getWorld(), chunkX, chunkZ, this.player.getBukkitEntity()).callEvent()) {
+                this.player.connection.connection.execute(onChunkSend);
+                return;
+            }
+            // Slice end
+
+            if (this.sentChunks.add(CoordinateUtils.getChunkKey(chunkX, chunkZ))) {  // Slice
                 this.player.getLevel().getChunkSource().chunkMap.updateChunkTracking(this.player,
                         new ChunkPos(chunkX, chunkZ), new MutableObject<>(), false, true); // unloaded, loaded
                 this.player.connection.connection.execute(onChunkSend);
diff --git a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
index 8334fbe6ffee640016ce17c1d331b6f88b569d65..c591b248da7f6349ce6da339f96ad9b51be042ef 100644
--- a/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
+++ b/src/main/java/org/bukkit/craftbukkit/CraftWorld.java
@@ -532,6 +532,13 @@ public class CraftWorld extends CraftRegionAccessor implements World {
         return true;
     }
 
+    @Override
+    public it.unimi.dsi.fastutil.longs.LongOpenHashSet getSentChunks(Player p) {
+        CraftPlayer craftPlayer = (CraftPlayer) p;
+        io.papermc.paper.chunk.PlayerChunkLoader.PlayerLoaderData data = this.world.chunkSource.chunkMap.playerChunkManager.getData(craftPlayer.getHandle());
+        return data != null ? data.sentChunks : null;
+    }
+
     @Override
     public boolean isChunkInUse(int x, int z) {
         return this.isChunkLoaded(x, z);