Support 4.2.0 changes

gradle/libs.versions.toml

@@ -4,7 +4,7 @@ bom-newest = "1.37"
 cloud-paper = "2.0.0-20240516.054251-69"
 coreprotect = "22.4"
 paper = "1.20.6-R0.1-SNAPSHOT"
-plotsquared = "7.3.9-20240513.192211-13"
+plotsquared = "7.3.8"
 reflection-remapper = "0.1.2-20240315.033304-2"
 viaversion-api = "5.0.1"
 worldguard-bukkit = "7.0.9-SNAPSHOT"

src/main/java/com/moulberry/axiom/AxiomPaper.java

@@ -9,25 +9,7 @@ import com.moulberry.axiom.event.AxiomModifyWorldEvent;
 import com.moulberry.axiom.integration.coreprotect.CoreProtectIntegration;
 import com.moulberry.axiom.integration.plotsquared.PlotSquaredIntegration;
 import com.moulberry.axiom.packet.*;
-import com.moulberry.axiom.packet.impl.BlueprintRequestPacketListener;
+import com.moulberry.axiom.packet.impl.*;
-import com.moulberry.axiom.packet.impl.DeleteEntityPacketListener;
-import com.moulberry.axiom.packet.impl.HelloPacketListener;
-import com.moulberry.axiom.packet.impl.ManipulateEntityPacketListener;
-import com.moulberry.axiom.packet.impl.MarkerNbtRequestPacketListener;
-import com.moulberry.axiom.packet.impl.RequestChunkDataPacketListener;
-import com.moulberry.axiom.packet.impl.SetBlockBufferPacketListener;
-import com.moulberry.axiom.packet.impl.SetBlockPacketListener;
-import com.moulberry.axiom.packet.impl.SetEditorViewsPacketListener;
-import com.moulberry.axiom.packet.impl.SetFlySpeedPacketListener;
-import com.moulberry.axiom.packet.impl.SetGamemodePacketListener;
-import com.moulberry.axiom.packet.impl.SetHotbarSlotPacketListener;
-import com.moulberry.axiom.packet.impl.SetTimePacketListener;
-import com.moulberry.axiom.packet.impl.SetWorldPropertyListener;
-import com.moulberry.axiom.packet.impl.SpawnEntityPacketListener;
-import com.moulberry.axiom.packet.impl.SwitchActiveHotbarPacketListener;
-import com.moulberry.axiom.packet.impl.TeleportPacketListener;
-import com.moulberry.axiom.packet.impl.UpdateAnnotationPacketListener;
-import com.moulberry.axiom.packet.impl.UploadBlueprintPacketListener;
 import com.moulberry.axiom.world_properties.server.ServerWorldPropertiesRegistry;
 import io.netty.buffer.Unpooled;
 import io.netty.channel.Channel;
@@ -46,6 +28,7 @@ import net.minecraft.network.protocol.game.GameProtocols;
 import net.minecraft.network.protocol.game.ServerGamePacketListener;
 import net.minecraft.resources.ResourceLocation;
 import net.minecraft.server.MinecraftServer;
+import net.minecraft.world.entity.EntityType;
 import net.minecraft.world.level.block.state.BlockState;
 import org.bukkit.*;
 import org.bukkit.command.CommandSender;
@@ -68,6 +51,7 @@ import java.nio.file.Files;
 import java.nio.file.Path;
 import java.util.*;
 import java.util.concurrent.ConcurrentHashMap;
+import java.util.function.IntFunction;
 
 public class AxiomPaper extends JavaPlugin implements Listener {
 
@@ -82,6 +66,9 @@ public class AxiomPaper extends JavaPlugin implements Listener {
 
     public IdMapper<BlockState> allowedBlockRegistry = null;
     private boolean logLargeBlockBufferChanges = false;
+    private int packetCollectionReadLimit = 1024;
+    private Set<EntityType<?>> whitelistedEntities = new HashSet<>();
+    private Set<EntityType<?>> blacklistedEntities = new HashSet<>();
 
     public Path blueprintFolder = null;
     public boolean allowAnnotations = false;
@@ -101,9 +88,21 @@ public class AxiomPaper extends JavaPlugin implements Listener {
             this.getLogger().warning("Invalid value for unsupported-axiom-version, expected 'kick', 'warn' or 'ignore'");
         }
 
-        boolean allowLargeChunkDataRequest = this.configuration.getBoolean("allow-large-chunk-data-request");
         this.logLargeBlockBufferChanges = this.configuration.getBoolean("log-large-block-buffer-changes");
 
+        if (this.configuration.getBoolean("allow-large-payload-for-all-packets")) {
+            packetCollectionReadLimit = Short.MAX_VALUE;
+        }
+
+        this.whitelistedEntities.clear();
+        this.blacklistedEntities.clear();
+        for (String whitelistedEntity : this.configuration.getStringList("whitelist-entities")) {
+            EntityType.byString(whitelistedEntity).ifPresent(this.whitelistedEntities::add);
+        }
+        for (String blacklistedEntity : this.configuration.getStringList("blacklist-entities")) {
+            EntityType.byString(blacklistedEntity).ifPresent(this.blacklistedEntities::add);
+        }
+
         List<String> disallowedBlocks = this.configuration.getStringList("disallowed-blocks");
         this.allowedBlockRegistry = DisallowedBlocks.createAllowedBlockRegistry(disallowedBlocks);
 
@@ -132,27 +131,29 @@ public class AxiomPaper extends JavaPlugin implements Listener {
 
         Map<String, PacketHandler> largePayloadHandlers = new HashMap<>();
 
-        registerPacketHandler("hello", new HelloPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("hello", new HelloPacketListener(this), msg, LargePayloadBehaviour.FORCE_SMALL, largePayloadHandlers);
-        registerPacketHandler("set_gamemode", new SetGamemodePacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("set_gamemode", new SetGamemodePacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("set_fly_speed", new SetFlySpeedPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("set_fly_speed", new SetFlySpeedPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("set_world_time", new SetTimePacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("set_world_time", new SetTimePacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("set_world_property", new SetWorldPropertyListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("set_world_property", new SetWorldPropertyListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("set_block", new SetBlockPacketListener(this), msg, largePayloadHandlers); // set-single-block
+        registerPacketHandler("set_block", new SetBlockPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers); // set-single-block
-        registerPacketHandler("set_hotbar_slot", new SetHotbarSlotPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("set_hotbar_slot", new SetHotbarSlotPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("switch_active_hotbar", new SwitchActiveHotbarPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("switch_active_hotbar", new SwitchActiveHotbarPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("teleport", new TeleportPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("teleport", new TeleportPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("set_editor_views", new SetEditorViewsPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("set_editor_views", new SetEditorViewsPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("request_chunk_data", new RequestChunkDataPacketListener(this,
+        registerPacketHandler("request_chunk_data", new RequestChunkDataPacketListener(this, !configuration.getBoolean("packet-handlers.request-chunk-data")), msg,
-            !configuration.getBoolean("packet-handlers.request-chunk-data")), msg, largePayloadHandlers);
+                this.configuration.getBoolean("allow-large-chunk-data-request") ? LargePayloadBehaviour.FORCE_LARGE : LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("spawn_entity", new SpawnEntityPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("request_entity_data", new RequestEntityDataPacketListener(this, !configuration.getBoolean("packet-handlers.request-entity-data")), msg,
-        registerPacketHandler("manipulate_entity", new ManipulateEntityPacketListener(this), msg, largePayloadHandlers);
+                this.configuration.getBoolean("allow-large-chunk-data-request") ? LargePayloadBehaviour.FORCE_LARGE : LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("delete_entity", new DeleteEntityPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("spawn_entity", new SpawnEntityPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("marker_nbt_request", new MarkerNbtRequestPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("manipulate_entity", new ManipulateEntityPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
-        registerPacketHandler("request_blueprint", new BlueprintRequestPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("delete_entity", new DeleteEntityPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
+        registerPacketHandler("marker_nbt_request", new MarkerNbtRequestPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
+        registerPacketHandler("request_blueprint", new BlueprintRequestPacketListener(this), msg, LargePayloadBehaviour.DEFAULT, largePayloadHandlers);
 
-        registerPacketHandler("set_buffer", new SetBlockBufferPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("set_buffer", new SetBlockBufferPacketListener(this), msg, LargePayloadBehaviour.FORCE_LARGE, largePayloadHandlers);
-        registerPacketHandler("upload_blueprint", new UploadBlueprintPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("upload_blueprint", new UploadBlueprintPacketListener(this), msg, LargePayloadBehaviour.FORCE_LARGE, largePayloadHandlers);
-        registerPacketHandler("annotation_update", new UpdateAnnotationPacketListener(this), msg, largePayloadHandlers);
+        registerPacketHandler("annotation_update", new UpdateAnnotationPacketListener(this), msg, LargePayloadBehaviour.FORCE_LARGE, largePayloadHandlers);
 
         if (!largePayloadHandlers.isEmpty()) {
             // Hack to figure out the id of the CustomPayload packet
@@ -299,25 +300,26 @@ public class AxiomPaper extends JavaPlugin implements Listener {
         }
     }
 
-    private void registerPacketHandler(String name, PacketHandler handler, Messenger messenger, Map<String, PacketHandler> largePayloadHandlers) {
+    private enum LargePayloadBehaviour {
+        DEFAULT,
+        FORCE_LARGE,
+        FORCE_SMALL
+    }
+
+    private void registerPacketHandler(String name, PacketHandler handler, Messenger messenger, LargePayloadBehaviour behaviour,
+                                       Map<String, PacketHandler> largePayloadHandlers) {
         String configEntry = "packet-handlers." + name.replace("_", "-");
         if (name.equals("set_block")) {
             configEntry = "packet-handlers.set-single-block";
         } else if (name.equals("request_blueprint")) {
             configEntry = "packet-handlers.blueprint-request";
         }
-        if (name.equals("request-chunk-data") || this.configuration.getBoolean(configEntry, true)) {
+        if (name.equals("request_chunk_data") || name.equals("request_entity_data") || this.configuration.getBoolean(configEntry, true)) {
-            boolean isLargePayload = false;
+            boolean isLargePayload = switch (behaviour) {
-
+                case DEFAULT -> this.configuration.getBoolean("allow-large-payload-for-all-packets");
-            if (name.equals("hello")) { // Hello must use normal system, as non-Axiom players can't send large payloads
+                case FORCE_LARGE -> true;
-                isLargePayload = false;
+                case FORCE_SMALL -> false;
-            } else if (this.configuration.getBoolean("allow-large-payload-for-all-packets")) {
+            };
-                isLargePayload = true;
-            } else if (name.equals("set_buffer") || name.equals("upload_blueprint") || name.equals("annotation_update")) {
-                isLargePayload = true;
-            } else if (name.equals("request_chunk_data") && this.configuration.getBoolean("allow-large-chunk-data-request")) {
-                isLargePayload = true;
-            }
 
             if (isLargePayload) {
                 largePayloadHandlers.put("axiom:"+name, handler);
@@ -347,6 +349,10 @@ public class AxiomPaper extends JavaPlugin implements Listener {
         return allowedCapabilities;
     }
 
+    public <T> IntFunction<T> limitCollection(IntFunction<T> applier) {
+        return FriendlyByteBuf.limitValue(applier, this.packetCollectionReadLimit);
+    }
+
     public boolean logLargeBlockBufferChanges() {
         return this.logLargeBlockBufferChanges;
     }
@@ -376,6 +382,19 @@ public class AxiomPaper extends JavaPlugin implements Listener {
         return activeAxiomPlayers.contains(player.getUniqueId()) && hasAxiomPermission(player, permission, strict);
     }
 
+    public boolean canEntityBeManipulated(EntityType<?> entityType) {
+        if (entityType == EntityType.PLAYER) {
+            return false;
+        }
+        if (!this.whitelistedEntities.isEmpty() && !this.whitelistedEntities.contains(entityType)) {
+            return false;
+        }
+        if (this.blacklistedEntities.contains(entityType)) {
+            return false;
+        }
+        return true;
+    }
+
     public @Nullable RateLimiter getBlockBufferRateLimiter(UUID uuid) {
         return this.playerBlockBufferRateLimiters.get(uuid);
     }

src/main/java/com/moulberry/axiom/NbtSanitization.java

@@ -21,6 +21,15 @@ public class NbtSanitization {
         "Glowing",
         "Tags",
         "Passengers",
+        // armor stand
+        "ArmorItems",
+        "HandItems",
+        "Small",
+        "ShowArms",
+        "DisabledSlots",
+        "NoBasePlate",
+        "Marker",
+        "Pose",
         // marker
         "data",
         // display entity
@@ -50,6 +59,10 @@ public class NbtSanitization {
     );
 
     public static void sanitizeEntity(CompoundTag entityRoot) {
+        if (AxiomPaper.PLUGIN.configuration.getBoolean("disable-entity-sanitization")) {
+            return;
+        }
+
         entityRoot.getAllKeys().retainAll(ALLOWED_KEYS);
 
         if (entityRoot.contains("Passengers", Tag.TAG_LIST)) {

src/main/java/com/moulberry/axiom/blueprint/BlueprintHeader.java

@@ -9,24 +9,25 @@ import net.minecraft.network.FriendlyByteBuf;
 import java.util.ArrayList;
 import java.util.List;
 
-public record BlueprintHeader(String name, String author, List<String> tags, float thumbnailYaw, float thumbnailPitch, boolean lockedThumbnail, int blockCount) {
+public record BlueprintHeader(String name, String author, List<String> tags, float thumbnailYaw, float thumbnailPitch, boolean lockedThumbnail, int blockCount, boolean containsAir) {
 
-    private static final int CURRENT_VERSION = 0;
+    private static final int CURRENT_VERSION = 1;
 
     public void write(FriendlyByteBuf friendlyByteBuf) {
         friendlyByteBuf.writeUtf(this.name);
         friendlyByteBuf.writeUtf(this.author);
         friendlyByteBuf.writeCollection(this.tags, FriendlyByteBuf::writeUtf);
         friendlyByteBuf.writeInt(this.blockCount);
+        friendlyByteBuf.writeBoolean(this.containsAir);
     }
 
     public static BlueprintHeader read(FriendlyByteBuf friendlyByteBuf) {
         String name = friendlyByteBuf.readUtf();
         String author = friendlyByteBuf.readUtf();
-        List<String> tags = friendlyByteBuf.readCollection(FriendlyByteBuf.limitValue(ArrayList::new, 1000),
+        List<String> tags = friendlyByteBuf.readList(FriendlyByteBuf::readUtf);
-            FriendlyByteBuf::readUtf);
         int blockCount = friendlyByteBuf.readInt();
-        return new BlueprintHeader(name, author, tags, 0, 0, true, blockCount);
+        boolean containsAir = friendlyByteBuf.readBoolean();
+        return new BlueprintHeader(name, author, tags, 0, 0, true, blockCount, containsAir);
     }
 
     public static BlueprintHeader load(CompoundTag tag) {
@@ -37,13 +38,14 @@ public record BlueprintHeader(String name, String author, List<String> tags, flo
         float thumbnailPitch = tag.contains("ThumbnailPitch", Tag.TAG_FLOAT) ? tag.getFloat("ThumbnailPitch") : 30;
         boolean lockedThumbnail = tag.getBoolean("LockedThumbnail");
         int blockCount = tag.getInt("BlockCount");
+        boolean containsAir = tag.getBoolean("ContainsAir");
 
         List<String> tags = new ArrayList<>();
         for (Tag string : tag.getList("Tags", Tag.TAG_STRING)) {
             tags.add(string.getAsString());
         }
 
-        return new BlueprintHeader(name, author, tags, thumbnailYaw, thumbnailPitch, lockedThumbnail, blockCount);
+        return new BlueprintHeader(name, author, tags, thumbnailYaw, thumbnailPitch, lockedThumbnail, blockCount, containsAir);
     }
 
     public CompoundTag save(CompoundTag tag) {
@@ -60,6 +62,7 @@ public record BlueprintHeader(String name, String author, List<String> tags, flo
         tag.putFloat("ThumbnailPitch", this.thumbnailPitch);
         tag.putBoolean("LockedThumbnail", this.lockedThumbnail);
         tag.putInt("BlockCount", this.blockCount);
+        tag.putBoolean("ContainsAir", this.containsAir);
         return tag;
     }
 

src/main/java/com/moulberry/axiom/blueprint/BlueprintIo.java

@@ -23,6 +23,8 @@ import net.minecraft.world.level.chunk.PalettedContainer;
 import java.io.*;
 import java.nio.file.Files;
 import java.nio.file.Path;
+import java.util.ArrayList;
+import java.util.List;
 
 public class BlueprintIo {
 
@@ -111,7 +113,23 @@ public class BlueprintIo {
             }
         }
 
-        return new RawBlueprint(header, thumbnailBytes, blockMap, blockEntities);
+        ListTag entitiesTag = blockDataTag.getList("Entities", Tag.TAG_COMPOUND);
+        List<CompoundTag> entities = new ArrayList<>();
+        for (Tag tag : entitiesTag) {
+            CompoundTag entityCompound = (CompoundTag) tag;
+
+            // Data Fix
+            if (blueprintDataVersion != currentDataVersion) {
+                Dynamic<Tag> dynamic = new Dynamic<>(NbtOps.INSTANCE, entityCompound);
+                Dynamic<Tag> output = DataFixers.getDataFixer().update(References.ENTITY, dynamic,
+                        blueprintDataVersion, currentDataVersion);
+                entityCompound = (CompoundTag) output.getValue();
+            }
+
+            entities.add(entityCompound);
+        }
+
+        return new RawBlueprint(header, thumbnailBytes, blockMap, blockEntities, entities);
     }
 
     public static final Codec<PalettedContainer<BlockState>> BLOCK_STATE_CODEC = PalettedContainer.codecRW(Block.BLOCK_STATE_REGISTRY, BlockState.CODEC,
@@ -137,41 +155,6 @@ public class BlueprintIo {
         return map;
     }
 
-    public static void writeHeader(Path inPath, Path outPath, BlueprintHeader newHeader) throws IOException {
-        byte[] thumbnailAndBlockBytes;
-        try (InputStream inputStream = new BufferedInputStream(Files.newInputStream(inPath))) {
-            if (inputStream.available() < 4) throw NOT_VALID_BLUEPRINT;
-            DataInputStream dataInputStream = new DataInputStream(inputStream);
-
-            int magic = dataInputStream.readInt();
-            if (magic != MAGIC) throw NOT_VALID_BLUEPRINT;
-
-            // Header
-            int headerLength = dataInputStream.readInt(); // Ignore header length
-            if (dataInputStream.skip(headerLength) < headerLength) throw NOT_VALID_BLUEPRINT;
-
-            thumbnailAndBlockBytes = dataInputStream.readAllBytes();
-        }
-
-        try (OutputStream outputStream = new BufferedOutputStream(Files.newOutputStream(outPath))) {
-            DataOutputStream dataOutputStream = new DataOutputStream(outputStream);
-
-            dataOutputStream.writeInt(MAGIC);
-
-            // Write header
-            CompoundTag headerTag = newHeader.save(new CompoundTag());
-            ByteArrayOutputStream baos = new ByteArrayOutputStream();
-            try (DataOutputStream os = new DataOutputStream(baos)) {
-                NbtIo.write(headerTag, os);
-            }
-            dataOutputStream.writeInt(baos.size());
-            baos.writeTo(dataOutputStream);
-
-            // Copy remaining bytes
-            dataOutputStream.write(thumbnailAndBlockBytes);
-        }
-    }
-
     public static void writeRaw(OutputStream outputStream, RawBlueprint rawBlueprint) throws IOException {
         DataOutputStream dataOutputStream = new DataOutputStream(outputStream);
 
@@ -240,6 +223,11 @@ public class BlueprintIo {
         });
         compound.put("BlockEntities", blockEntitiesTag);
 
+        // Write entities
+        ListTag entitiesTag = new ListTag();
+        entitiesTag.addAll(rawBlueprint.entities());
+        compound.put("Entities", entitiesTag);
+
         baos.reset();
         NbtIo.writeCompressed(compound, baos);
         dataOutputStream.writeInt(baos.size());

src/main/java/com/moulberry/axiom/blueprint/RawBlueprint.java

@@ -5,14 +5,18 @@ import it.unimi.dsi.fastutil.longs.Long2ObjectMap;
 import it.unimi.dsi.fastutil.longs.Long2ObjectOpenHashMap;
 import it.unimi.dsi.fastutil.longs.LongIterator;
 import it.unimi.dsi.fastutil.longs.LongSet;
+import net.minecraft.nbt.CompoundTag;
 import net.minecraft.network.FriendlyByteBuf;
 import net.minecraft.world.level.block.Block;
 import net.minecraft.world.level.block.Blocks;
 import net.minecraft.world.level.block.state.BlockState;
 import net.minecraft.world.level.chunk.PalettedContainer;
 
+import java.util.ArrayList;
+import java.util.List;
+
 public record RawBlueprint(BlueprintHeader header, byte[] thumbnail, Long2ObjectMap<PalettedContainer<BlockState>> blocks,
-                           Long2ObjectMap<CompressedBlockEntity> blockEntities) {
+                           Long2ObjectMap<CompressedBlockEntity> blockEntities, List<CompoundTag> entities) {
 
     public static void writeHeader(FriendlyByteBuf friendlyByteBuf, RawBlueprint rawBlueprint) {
         rawBlueprint.header.write(friendlyByteBuf);
@@ -23,7 +27,7 @@ public record RawBlueprint(BlueprintHeader header, byte[] thumbnail, Long2Object
         BlueprintHeader header = BlueprintHeader.read(friendlyByteBuf);
         byte[] thumbnail = friendlyByteBuf.readByteArray();
 
-        return new RawBlueprint(header, thumbnail, null, null);
+        return new RawBlueprint(header, thumbnail, null, null, null);
     }
 
     public static void write(FriendlyByteBuf friendlyByteBuf, RawBlueprint rawBlueprint) {
@@ -49,6 +53,11 @@ public record RawBlueprint(BlueprintHeader header, byte[] thumbnail, Long2Object
             friendlyByteBuf.writeLong(pos);
             rawBlueprint.blockEntities.get(pos).write(friendlyByteBuf);
         }
+
+        friendlyByteBuf.writeVarInt(rawBlueprint.entities.size());
+        for (CompoundTag entity : rawBlueprint.entities) {
+            friendlyByteBuf.writeNbt(entity);
+        }
     }
 
     public static RawBlueprint read(FriendlyByteBuf friendlyByteBuf) {
@@ -78,7 +87,14 @@ public record RawBlueprint(BlueprintHeader header, byte[] thumbnail, Long2Object
             blockEntities.put(pos, compressedBlockEntity);
         }
 
-        return new RawBlueprint(header, thumbnail, blocks, blockEntities);
+        List<CompoundTag> entities = new ArrayList<>();
+
+        int entityCount = friendlyByteBuf.readVarInt();
+        for (int i = 0; i < entityCount; i++) {
+            entities.add(friendlyByteBuf.readNbt());
+        }
+
+        return new RawBlueprint(header, thumbnail, blocks, blockEntities, entities);
     }
 
 }

src/main/java/com/moulberry/axiom/packet/impl/DeleteEntityPacketListener.java

@@ -35,22 +35,17 @@ public class DeleteEntityPacketListener implements PacketHandler {
             return;
         }
 
-        List<UUID> delete = friendlyByteBuf.readCollection(FriendlyByteBuf.limitValue(ArrayList::new, 1000),
+        List<UUID> delete = friendlyByteBuf.readCollection(this.plugin.limitCollection(ArrayList::new), buf -> buf.readUUID());
-            buf -> buf.readUUID());
 
         ServerLevel serverLevel = ((CraftWorld)player.getWorld()).getHandle();
 
-        List<String> whitelistedEntities = this.plugin.configuration.getStringList("whitelist-entities");
-        List<String> blacklistedEntities = this.plugin.configuration.getStringList("blacklist-entities");
-
         for (UUID uuid : delete) {
             Entity entity = serverLevel.getEntity(uuid);
             if (entity == null || entity instanceof net.minecraft.world.entity.player.Player || entity.hasPassenger(e -> e instanceof net.minecraft.world.entity.player.Player)) continue;
 
-            String type = EntityType.getKey(entity.getType()).toString();
+            if (!this.plugin.canEntityBeManipulated(entity.getType())) {
-
+                continue;
-            if (!whitelistedEntities.isEmpty() && !whitelistedEntities.contains(type)) continue;
+            }
-            if (blacklistedEntities.contains(type)) continue;
 
             if (!Integration.canBreakBlock(player,
                     player.getWorld().getBlockAt(entity.getBlockX(), entity.getBlockY(), entity.getBlockZ()))) {

src/main/java/com/moulberry/axiom/packet/impl/HelloPacketListener.java

@@ -138,6 +138,9 @@ public class HelloPacketListener implements PacketHandler {
         buf.writeVarInt(5); // Maximum Reach
         buf.writeVarInt(16); // Max editor views
         buf.writeBoolean(true); // Editable Views
+        buf.writeVarInt(0); // No custom data overrides
+        buf.writeVarInt(0); // No rotation overrides
+        buf.writeVarInt(1); // Blueprint version
 
         byte[] enableBytes = new byte[buf.writerIndex()];
         buf.getBytes(0, enableBytes);

src/main/java/com/moulberry/axiom/packet/impl/ManipulateEntityPacketListener.java

@@ -49,7 +49,7 @@ public class ManipulateEntityPacketListener implements PacketHandler {
 
     public record ManipulateEntry(UUID uuid, @Nullable Set<RelativeMovement> relativeMovementSet, @Nullable Vec3 position,
                                   float yaw, float pitch, CompoundTag merge, PassengerManipulation passengerManipulation, List<UUID> passengers) {
-        public static ManipulateEntry read(FriendlyByteBuf friendlyByteBuf, Player player) {
+        public static ManipulateEntry read(FriendlyByteBuf friendlyByteBuf, Player player, AxiomPaper plugin) {
             UUID uuid = friendlyByteBuf.readUUID();
 
             int flags = friendlyByteBuf.readByte();
@@ -69,8 +69,7 @@ public class ManipulateEntityPacketListener implements PacketHandler {
             PassengerManipulation passengerManipulation = friendlyByteBuf.readEnum(PassengerManipulation.class);
             List<UUID> passengers = List.of();
             if (passengerManipulation == PassengerManipulation.ADD_LIST || passengerManipulation == PassengerManipulation.REMOVE_LIST) {
-                passengers = friendlyByteBuf.readCollection(FriendlyByteBuf.limitValue(ArrayList::new, 1000),
+                passengers = friendlyByteBuf.readCollection(plugin.limitCollection(ArrayList::new), buffer -> buffer.readUUID());
-                    buffer -> buffer.readUUID());
             }
 
             return new ManipulateEntry(uuid, relativeMovementSet, position, yaw, pitch, nbt,
@@ -90,22 +89,18 @@ public class ManipulateEntityPacketListener implements PacketHandler {
             return;
         }
 
-        List<ManipulateEntry> entries = friendlyByteBuf.readCollection(FriendlyByteBuf.limitValue(ArrayList::new, 1000),
+        List<ManipulateEntry> entries = friendlyByteBuf.readCollection(this.plugin.limitCollection(ArrayList::new),
-            buf -> ManipulateEntry.read(buf, player));
+                buf -> ManipulateEntry.read(buf, player, this.plugin));
 
         ServerLevel serverLevel = ((CraftWorld)player.getWorld()).getHandle();
 
-        List<String> whitelistedEntities = this.plugin.configuration.getStringList("whitelist-entities");
-        List<String> blacklistedEntities = this.plugin.configuration.getStringList("blacklist-entities");
-
         for (ManipulateEntry entry : entries) {
             Entity entity = serverLevel.getEntity(entry.uuid);
             if (entity == null || entity instanceof net.minecraft.world.entity.player.Player || entity.hasPassenger(ManipulateEntityPacketListener::isPlayer)) continue;
 
-            String type = EntityType.getKey(entity.getType()).toString();
+            if (!this.plugin.canEntityBeManipulated(entity.getType())) {
-
+                continue;
-            if (!whitelistedEntities.isEmpty() && !whitelistedEntities.contains(type)) continue;
+            }
-            if (blacklistedEntities.contains(type)) continue;
 
             Vec3 position = entity.position();
             BlockPos containing = BlockPos.containing(position.x, position.y, position.z);
@@ -168,10 +163,9 @@ public class ManipulateEntityPacketListener implements PacketHandler {
                         if (passenger == null || passenger.isPassenger() ||
                             passenger instanceof net.minecraft.world.entity.player.Player || passenger.hasPassenger(ManipulateEntityPacketListener::isPlayer)) continue;
 
-                        String passengerType = EntityType.getKey(passenger.getType()).toString();
+                        if (!this.plugin.canEntityBeManipulated(passenger.getType())) {
-
+                            continue;
-                        if (!whitelistedEntities.isEmpty() && !whitelistedEntities.contains(passengerType)) continue;
+                        }
-                        if (blacklistedEntities.contains(passengerType)) continue;
 
                         // Prevent mounting loop
                         if (passenger.getSelfAndPassengers().anyMatch(entity2 -> entity2 == entity)) {
@@ -195,10 +189,9 @@ public class ManipulateEntityPacketListener implements PacketHandler {
                         if (passenger == null || passenger == entity || passenger instanceof net.minecraft.world.entity.player.Player ||
                             passenger.hasPassenger(ManipulateEntityPacketListener::isPlayer)) continue;
 
-                        String passengerType = EntityType.getKey(passenger.getType()).toString();
+                        if (!this.plugin.canEntityBeManipulated(passenger.getType())) {
-
+                            continue;
-                        if (!whitelistedEntities.isEmpty() && !whitelistedEntities.contains(passengerType)) continue;
+                        }
-                        if (blacklistedEntities.contains(passengerType)) continue;
 
                         Entity vehicle = passenger.getVehicle();
                         if (vehicle == entity) {

src/main/java/com/moulberry/axiom/packet/impl/RequestChunkDataPacketListener.java

@@ -68,7 +68,7 @@ public class RequestChunkDataPacketListener implements PacketHandler {
 
         ResourceKey<Level> worldKey = friendlyByteBuf.readResourceKey(Registries.DIMENSION);
         ServerLevel level = server.getLevel(worldKey);
-        if (level == null) {
+        if (level == null || level != player.serverLevel()) {
             sendEmptyResponse(player, id);
             return;
         }

src/main/java/com/moulberry/axiom/packet/impl/RequestEntityDataPacketListener.java

@@ -0,0 +1,108 @@
+package com.moulberry.axiom.packet.impl;
+
+import com.moulberry.axiom.AxiomPaper;
+import com.moulberry.axiom.VersionHelper;
+import com.moulberry.axiom.integration.Integration;
+import com.moulberry.axiom.packet.PacketHandler;
+import io.netty.buffer.Unpooled;
+import net.minecraft.nbt.CompoundTag;
+import net.minecraft.network.FriendlyByteBuf;
+import net.minecraft.network.protocol.game.ClientboundCustomPayloadPacket;
+import net.minecraft.resources.ResourceLocation;
+import net.minecraft.server.level.ServerLevel;
+import net.minecraft.server.level.ServerPlayer;
+import net.minecraft.world.entity.Entity;
+import net.minecraft.world.entity.player.Player;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.v1_20_R1.entity.CraftPlayer;
+
+import java.util.*;
+
+public class RequestEntityDataPacketListener implements PacketHandler {
+
+    public static final ResourceLocation RESPONSE_ID = VersionHelper.createResourceLocation("axiom:response_entity_data");
+
+    private final AxiomPaper plugin;
+    private final boolean forceFail;
+    public RequestEntityDataPacketListener(AxiomPaper plugin, boolean forceFail) {
+        this.plugin = plugin;
+        this.forceFail = forceFail;
+    }
+
+    @Override
+    public void onReceive(org.bukkit.entity.Player bukkitPlayer, FriendlyByteBuf friendlyByteBuf) {
+        ServerPlayer player = ((CraftPlayer)bukkitPlayer).getHandle();
+        long id = friendlyByteBuf.readLong();
+
+        if (this.forceFail || !this.plugin.canUseAxiom(bukkitPlayer, "axiom.entity.request_data") || this.plugin.isMismatchedDataVersion(bukkitPlayer.getUniqueId())) {
+            // We always send an 'empty' response in order to make the client happy
+            sendResponse(player, id, true, Map.of());
+            return;
+        }
+
+        if (!this.plugin.canModifyWorld(bukkitPlayer, bukkitPlayer.getWorld())) {
+            sendResponse(player, id, true, Map.of());
+            return;
+        }
+
+        List<UUID> request = friendlyByteBuf.readCollection(this.plugin.limitCollection(ArrayList::new), buf -> buf.readUUID());
+        ServerLevel serverLevel = player.serverLevel();
+
+        final int maxPacketSize = 0x100000;
+        int remainingBytes = maxPacketSize;
+
+        Map<UUID, CompoundTag> entityData = new HashMap<>();
+
+        Set<UUID> visitedEntities = new HashSet<>();
+
+        for (UUID uuid : request) {
+            if (!visitedEntities.add(uuid)) {
+                continue;
+            }
+
+            Entity entity = serverLevel.getEntity(uuid);
+            if (entity == null || entity instanceof Player) {
+                continue;
+            }
+
+            if (!this.plugin.canEntityBeManipulated(entity.getType())) {
+                continue;
+            }
+
+            if (!Integration.canPlaceBlock(bukkitPlayer, new Location(bukkitPlayer.getWorld(),
+                    entity.getBlockX(), entity.getBlockY(), entity.getBlockZ()))) {
+                continue;
+            }
+
+            CompoundTag entityTag = new CompoundTag();
+            if (entity.save(entityTag)) {
+                int size = entityTag.sizeInBytes();
+                if (size >= maxPacketSize) {
+                    sendResponse(player, id, false, Map.of(uuid, entityTag));
+                    continue;
+                }
+
+                // Send partial packet if we've run out of available bytes
+                if (remainingBytes - size < 0) {
+                    sendResponse(player, id, false, entityData);
+                    entityData.clear();
+                }
+
+                entityData.put(uuid, entityTag);
+                remainingBytes -= size;
+            }
+        }
+
+        sendResponse(player, id, true, entityData);
+    }
+
+    private static void sendResponse(ServerPlayer player, long id, boolean finished, Map<UUID, CompoundTag> map) {
+        FriendlyByteBuf friendlyByteBuf = new FriendlyByteBuf(Unpooled.buffer());
+        friendlyByteBuf.writeLong(id);
+        friendlyByteBuf.writeBoolean(finished);
+        friendlyByteBuf.writeMap(map, (buf, uuid) -> buf.writeUUID(uuid), (buf, nbt) -> buf.writeNbt(nbt));
+
+        player.connection.send(new ClientboundCustomPayloadPacket(RESPONSE_ID, friendlyByteBuf));
+    }
+
+}

src/main/java/com/moulberry/axiom/packet/impl/SetBlockPacketListener.java

@@ -92,7 +92,7 @@ public class SetBlockPacketListener implements PacketHandler {
         }
 
         // Read packet
-        IntFunction<Map<BlockPos, BlockState>> mapFunction = FriendlyByteBuf.limitValue(Maps::newLinkedHashMapWithExpectedSize, 512);
+        IntFunction<Map<BlockPos, BlockState>> mapFunction = this.plugin.limitCollection(Maps::newLinkedHashMapWithExpectedSize);
         IdMapper<BlockState> registry = this.plugin.getBlockRegistry(bukkitPlayer.getUniqueId());
         Map<BlockPos, BlockState> blocks = friendlyByteBuf.readMap(mapFunction,
                 buf -> buf.readBlockPos(), buf -> buf.readById(registry::byIdOrThrow));

src/main/java/com/moulberry/axiom/packet/impl/SpawnEntityPacketListener.java

@@ -54,16 +54,13 @@ public class SpawnEntityPacketListener implements PacketHandler {
             return;
         }
 
-        List<SpawnEntry> entries = friendlyByteBuf.readCollection(FriendlyByteBuf.limitValue(ArrayList::new, 1000),
+        List<SpawnEntry> entries = friendlyByteBuf.readCollection(this.plugin.limitCollection(ArrayList::new),
             buf -> new SpawnEntry(buf.readUUID(), buf.readDouble(), buf.readDouble(),
                 buf.readDouble(), buf.readFloat(), buf.readFloat(),
                 buf.readNullable(buffer -> buffer.readUUID()), UnknownVersionHelper.readTagUnknown(buf, player)));
 
         ServerLevel serverLevel = ((CraftWorld)player.getWorld()).getHandle();
 
-        List<String> whitelistedEntities = this.plugin.configuration.getStringList("whitelist-entities");
-        List<String> blacklistedEntities = this.plugin.configuration.getStringList("blacklist-entities");
-
         for (SpawnEntry entry : entries) {
             Vec3 position = new Vec3(entry.x, entry.y, entry.z);
 
@@ -99,9 +96,9 @@ public class SpawnEntityPacketListener implements PacketHandler {
             AtomicBoolean useNewUuid = new AtomicBoolean(true);
 
             Entity spawned = EntityType.loadEntityRecursive(tag, serverLevel, entity -> {
-                String type = EntityType.getKey(entity.getType()).toString();
+                if (!this.plugin.canEntityBeManipulated(entity.getType())) {
-                if (!whitelistedEntities.isEmpty() && !whitelistedEntities.contains(type)) return null;
+                    return null;
-                if (blacklistedEntities.contains(type)) return null;
+                }
 
                 if (useNewUuid.getAndSet(false)) {
                     entity.setUUID(entry.newUuid);

src/main/resources/config.yml

@@ -14,7 +14,7 @@ allow-teleport-between-worlds: true
 # Whether to allow clients to save/load/share blueprints through the server
 blueprint-sharing: false
 
-# Allow large chunk data requests, not recommended for public servers
+# Allow large chunk & entity data requests, not recommended for public servers
 allow-large-chunk-data-request: false
 
 # Raise the size limit for *all* packets to 2mb instead of 32kb. NOT RECOMMENDED FOR PUBLIC SERVERS
@@ -57,6 +57,9 @@ whitelist-entities:
 blacklist-entities:
 #  - "minecraft:ender_dragon"
 
+# Disables entity data sanitization. NOT RECOMMENDED FOR PUBLIC SERVERS
+disable-entity-sanitization: false
+
 # True allows players to see/manipulate marker entities
 send-markers: false
 
@@ -95,6 +98,7 @@ packet-handlers:
   teleport: true
   set-editor-views: true
   request-chunk-data: true
+  request-entity-data: true
   set-buffer: true
   spawn-entity: true
   manipulate-entity: true

src/main/resources/plugin.yml

@@ -25,6 +25,7 @@ permissions:
       axiom.entity.spawn: true
       axiom.entity.manipulate: true
       axiom.entity.delete: true
+      axiom.entity.request_data: true
   axiom.blueprint.*:
     description: Allows use of all blueprint-related features
     default: op