PaperMC/nms-patches/ItemBucket.patch

--- a/net/minecraft/server/ItemBucket.java
+++ b/net/minecraft/server/ItemBucket.java
@@ -1,5 +1,12 @@
 package net.minecraft.server;
 
+// CraftBukkit start
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.event.player.PlayerBucketEmptyEvent;
+import org.bukkit.event.player.PlayerBucketFillEvent;
+// CraftBukkit end
+
 public class ItemBucket extends Item {
 
     private Block a;
@@ -33,19 +40,41 @@
                     Material material = iblockdata.getBlock().getMaterial();
 
                     if (material == Material.WATER && ((Integer) iblockdata.get(BlockFluids.LEVEL)).intValue() == 0) {
+                        // CraftBukkit start
+                        PlayerBucketFillEvent event = CraftEventFactory.callPlayerBucketFillEvent(entityhuman, blockposition.getX(), blockposition.getY(), blockposition.getZ(), null, itemstack, Items.WATER_BUCKET);
+
+                        if (event.isCancelled()) {
+                            return itemstack;
+                        }
+                        // CraftBukkit end
                         world.setAir(blockposition);
                         entityhuman.b(StatisticList.USE_ITEM_COUNT[Item.getId(this)]);
-                        return this.a(itemstack, entityhuman, Items.WATER_BUCKET);
+                        return this.a(itemstack, entityhuman, Items.WATER_BUCKET, event.getItemStack()); // CraftBukkit - added Event stack
                     }
 
                     if (material == Material.LAVA && ((Integer) iblockdata.get(BlockFluids.LEVEL)).intValue() == 0) {
+                        // CraftBukkit start
+                        PlayerBucketFillEvent event = CraftEventFactory.callPlayerBucketFillEvent(entityhuman, blockposition.getX(), blockposition.getY(), blockposition.getZ(), null, itemstack, Items.LAVA_BUCKET);
+
+                        if (event.isCancelled()) {
+                            return itemstack;
+                        }
+                        // CraftBukkit end
                         world.setAir(blockposition);
                         entityhuman.b(StatisticList.USE_ITEM_COUNT[Item.getId(this)]);
-                        return this.a(itemstack, entityhuman, Items.LAVA_BUCKET);
+                        return this.a(itemstack, entityhuman, Items.LAVA_BUCKET, event.getItemStack()); // CraftBukkit - added Event stack
                     }
                 } else {
                     if (this.a == Blocks.AIR) {
-                        return new ItemStack(Items.BUCKET);
+                        // CraftBukkit start
+                        PlayerBucketEmptyEvent event = CraftEventFactory.callPlayerBucketEmptyEvent(entityhuman, blockposition.getX(), blockposition.getY(), blockposition.getZ(), movingobjectposition.direction, itemstack);
+
+                        if (event.isCancelled()) {
+                            return itemstack;
+                        }
+
+                        return CraftItemStack.asNMSCopy(event.getItemStack());
+                        // CraftBukkit end
                     }
 
                     BlockPosition blockposition1 = blockposition.shift(movingobjectposition.direction);
@@ -54,9 +83,17 @@
                         return itemstack;
                     }
 
+                    // CraftBukkit start
+                    PlayerBucketEmptyEvent event = CraftEventFactory.callPlayerBucketEmptyEvent(entityhuman, blockposition.getX(), blockposition.getY(), blockposition.getZ(), movingobjectposition.direction, itemstack);
+
+                    if (event.isCancelled()) {
+                        return itemstack;
+                    }
+                    // CraftBukkit end
+
                     if (this.a(world, blockposition1) && !entityhuman.abilities.canInstantlyBuild) {
                         entityhuman.b(StatisticList.USE_ITEM_COUNT[Item.getId(this)]);
-                        return new ItemStack(Items.BUCKET);
+                        return CraftItemStack.asNMSCopy(event.getItemStack()); // CraftBukkit
                     }
                 }
             }
@@ -65,14 +102,15 @@
         }
     }
 
-    private ItemStack a(ItemStack itemstack, EntityHuman entityhuman, Item item) {
+    // CraftBukkit - added ob.ItemStack result - TODO: Is this... the right way to handle this?
+    private ItemStack a(ItemStack itemstack, EntityHuman entityhuman, Item item, org.bukkit.inventory.ItemStack result) {
         if (entityhuman.abilities.canInstantlyBuild) {
             return itemstack;
         } else if (--itemstack.count <= 0) {
-            return new ItemStack(item);
+            return CraftItemStack.asNMSCopy(result); // CraftBukkit
         } else {
-            if (!entityhuman.inventory.pickup(new ItemStack(item))) {
-                entityhuman.drop(new ItemStack(item, 1, 0), false);
+            if (!entityhuman.inventory.pickup(CraftItemStack.asNMSCopy(result))) {
+                entityhuman.drop(CraftItemStack.asNMSCopy(result), false);
             }
 
             return itemstack;