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

@@ -2,6 +2,7 @@ package com.moulberry.axiom;
 
 import com.moulberry.axiom.buffer.CompressedBlockEntity;
 import com.moulberry.axiom.event.AxiomCreateWorldPropertiesEvent;
+import com.moulberry.axiom.event.AxiomModifyWorldEvent;
 import com.moulberry.axiom.packet.*;
 import com.moulberry.axiom.world_properties.server.ServerWorldPropertiesRegistry;
 import com.moulberry.axiom.world_properties.server.ServerWorldProperty;
@@ -175,6 +176,22 @@ public class AxiomPaper extends JavaPlugin implements Listener {
         }
     }
 
+    public boolean canModifyWorld(Player player, World world) {
+        String whitelist = this.configuration.getString("whitelist-world-regex");
+        if (whitelist != null && !world.getName().matches(whitelist)) {
+            return false;
+        }
+
+        String blacklist = this.configuration.getString("blacklist-world-regex");
+        if (blacklist != null && world.getName().matches(blacklist)) {
+            return false;
+        }
+
+        AxiomModifyWorldEvent modifyWorldEvent = new AxiomModifyWorldEvent(player, world);
+        Bukkit.getPluginManager().callEvent(modifyWorldEvent);
+        return !modifyWorldEvent.isCancelled();
+    }
+
     @EventHandler
     public void onFailMove(PlayerFailMoveEvent event) {
         if (event.getPlayer().hasPermission("axiom.*")) {

src/main/java/com/moulberry/axiom/event/AxiomModifyWorldEvent.java

@@ -1,5 +1,6 @@
 package com.moulberry.axiom.event;
 
+import com.moulberry.axiom.AxiomPaper;
 import org.bukkit.World;
 import org.bukkit.entity.Player;
 import org.bukkit.event.Cancellable;

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

@@ -51,10 +51,7 @@ public class RequestChunkDataPacketListener implements PluginMessageListener {
             return;
         }
 
-        // Call AxiomModifyWorldEvent event
-        AxiomModifyWorldEvent modifyWorldEvent = new AxiomModifyWorldEvent(bukkitPlayer, bukkitPlayer.getWorld());
-        Bukkit.getPluginManager().callEvent(modifyWorldEvent);
-        if (modifyWorldEvent.isCancelled()) {
+        if (!this.plugin.canModifyWorld(bukkitPlayer, bukkitPlayer.getWorld())) {
             sendEmptyResponse(player, id);
             return;
         }

src/main/java/com/moulberry/axiom/packet/SetBlockBufferPacketListener.java

@@ -96,10 +96,9 @@ public class SetBlockBufferPacketListener {
                 return;
             }
 
-            // Call AxiomModifyWorldEvent event
-            AxiomModifyWorldEvent modifyWorldEvent = new AxiomModifyWorldEvent(player.getBukkitEntity(), world.getWorld());
-            Bukkit.getPluginManager().callEvent(modifyWorldEvent);
-            if (modifyWorldEvent.isCancelled()) return;
+            if (!this.plugin.canModifyWorld(player.getBukkitEntity(), world.getWorld())) {
+                return;
+            }
 
             // Allowed, apply buffer
             BlockPos.MutableBlockPos blockPos = new BlockPos.MutableBlockPos();
@@ -257,10 +256,9 @@ public class SetBlockBufferPacketListener {
                 return;
             }
 
-            // Call AxiomModifyWorldEvent event
-            AxiomModifyWorldEvent modifyWorldEvent = new AxiomModifyWorldEvent(player.getBukkitEntity(), world.getWorld());
-            Bukkit.getPluginManager().callEvent(modifyWorldEvent);
-            if (modifyWorldEvent.isCancelled()) return;
+            if (!this.plugin.canModifyWorld(player.getBukkitEntity(), world.getWorld())) {
+                return;
+            }
 
             Set<LevelChunk> changedChunks = new HashSet<>();
 

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

@@ -65,10 +65,9 @@ public class SetBlockPacketListener implements PluginMessageListener {
             return;
         }
 
-        // Check if player is allowed to modify this world
-        AxiomModifyWorldEvent modifyWorldEvent = new AxiomModifyWorldEvent(bukkitPlayer, bukkitPlayer.getWorld());
-        Bukkit.getPluginManager().callEvent(modifyWorldEvent);
-        if (modifyWorldEvent.isCancelled()) return;
+        if (!this.plugin.canModifyWorld(bukkitPlayer, bukkitPlayer.getWorld())) {
+            return;
+        }
 
         // Read packet
         FriendlyByteBuf friendlyByteBuf = new FriendlyByteBuf(Unpooled.wrappedBuffer(message));

src/main/java/com/moulberry/axiom/packet/SetTimePacketListener.java

@@ -40,9 +40,9 @@ public class SetTimePacketListener implements PluginMessageListener {
         if (!level.dimension().equals(key)) return;
 
         // Call modify world
-        AxiomModifyWorldEvent modifyWorldEvent = new AxiomModifyWorldEvent(player, player.getWorld());
-        Bukkit.getPluginManager().callEvent(modifyWorldEvent);
-        if (modifyWorldEvent.isCancelled()) return;
+        if (!this.plugin.canModifyWorld(player, player.getWorld())) {
+            return;
+        }
 
         // Call time change event
         AxiomTimeChangeEvent timeChangeEvent = new AxiomTimeChangeEvent(player, time, freezeTime);

src/main/resources/config.yml

@@ -20,6 +20,14 @@ unsupported-axiom-version: "kick"
 # Maximum packet size. Must not be less than 32767
 max-block-buffer-packet-size: 0x100000
 
+# Regex for whitelisting worlds
+# The world can only be modified if the regex matches the world's name
+whitelist-world-regex: null
+
+# Regex for blacklisting worlds
+# If the regex matches the world's name, the world can't be modified
+blacklist-world-regex: null
+
 # Toggles for individual packet handlers. May break certain features
 packet-handlers:
   hello: true