PaperMC/paper-server/patches/sources/net/minecraft/world/item/BucketItem.java.patch

--- a/net/minecraft/world/item/BucketItem.java
+++ b/net/minecraft/world/item/BucketItem.java
@@ -6,6 +6,8 @@
 import net.minecraft.core.Direction;
 import net.minecraft.core.Holder;
 import net.minecraft.core.particles.ParticleTypes;
+import net.minecraft.network.protocol.game.ClientboundBlockUpdatePacket;
+import net.minecraft.server.level.ServerLevel;
 import net.minecraft.server.level.ServerPlayer;
 import net.minecraft.sounds.SoundEvent;
 import net.minecraft.sounds.SoundEvents;
@@ -29,9 +31,17 @@
 import net.minecraft.world.level.material.Fluids;
 import net.minecraft.world.phys.BlockHitResult;
 import net.minecraft.world.phys.HitResult;
+import org.bukkit.craftbukkit.event.CraftEventFactory;
+import org.bukkit.craftbukkit.inventory.CraftItemStack;
+import org.bukkit.craftbukkit.util.DummyGeneratorAccess;
+import org.bukkit.event.player.PlayerBucketEmptyEvent;
+import org.bukkit.event.player.PlayerBucketFillEvent;
+// CraftBukkit end
 
 public class BucketItem extends Item implements DispensibleContainerItem {
 
+    private static @Nullable ItemStack itemLeftInHandAfterPlayerBucketEmptyEvent = null; // Paper - Fix PlayerBucketEmptyEvent result itemstack
+
     public final Fluid content;
 
     public BucketItem(Fluid fluid, Item.Properties settings) {
@@ -63,7 +73,18 @@
 
                     if (block instanceof BucketPickup) {
                         BucketPickup ifluidsource = (BucketPickup) block;
+                        // CraftBukkit start
+                        ItemStack dummyFluid = ifluidsource.pickupBlock(user, DummyGeneratorAccess.INSTANCE, blockposition, iblockdata);
+                        if (dummyFluid.isEmpty()) return InteractionResult.FAIL; // Don't fire event if the bucket won't be filled.
+                        PlayerBucketFillEvent event = CraftEventFactory.callPlayerBucketFillEvent((ServerLevel) world, user, blockposition, blockposition, movingobjectpositionblock.getDirection(), itemstack, dummyFluid.getItem(), hand);
 
+                        if (event.isCancelled()) {
+                            ((ServerPlayer) user).connection.send(new ClientboundBlockUpdatePacket(world, blockposition)); // SPIGOT-5163 (see PlayerInteractManager)
+                            ((ServerPlayer) user).getBukkitEntity().updateInventory(); // SPIGOT-4541
+                            return InteractionResult.FAIL;
+                        }
+                        // CraftBukkit end
+
                         itemstack1 = ifluidsource.pickupBlock(user, world, blockposition, iblockdata);
                         if (!itemstack1.isEmpty()) {
                             user.awardStat(Stats.ITEM_USED.get(this));
@@ -71,7 +92,7 @@
                                 user.playSound(soundeffect, 1.0F, 1.0F);
                             });
                             world.gameEvent((Entity) user, (Holder) GameEvent.FLUID_PICKUP, blockposition);
-                            ItemStack itemstack2 = ItemUtils.createFilledResult(itemstack, user, itemstack1);
+                            ItemStack itemstack2 = ItemUtils.createFilledResult(itemstack, user, CraftItemStack.asNMSCopy(event.getItemStack())); // CraftBukkit
 
                             if (!world.isClientSide) {
                                 CriteriaTriggers.FILLED_BUCKET.trigger((ServerPlayer) user, itemstack1);
@@ -86,7 +107,7 @@
                     iblockdata = world.getBlockState(blockposition);
                     BlockPos blockposition2 = iblockdata.getBlock() instanceof LiquidBlockContainer && this.content == Fluids.WATER ? blockposition : blockposition1;
 
-                    if (this.emptyContents(user, world, blockposition2, movingobjectpositionblock)) {
+                    if (this.emptyContents(user, world, blockposition2, movingobjectpositionblock, movingobjectpositionblock.getDirection(), blockposition, itemstack, hand)) { // CraftBukkit
                         this.checkExtraContent(user, world, itemstack, blockposition2);
                         if (user instanceof ServerPlayer) {
                             CriteriaTriggers.PLACED_BLOCK.trigger((ServerPlayer) user, blockposition2, itemstack);
@@ -106,6 +127,13 @@
     }
 
     public static ItemStack getEmptySuccessItem(ItemStack stack, Player player) {
+        // Paper start - Fix PlayerBucketEmptyEvent result itemstack
+        if (itemLeftInHandAfterPlayerBucketEmptyEvent != null) {
+            ItemStack itemInHand = itemLeftInHandAfterPlayerBucketEmptyEvent;
+            itemLeftInHandAfterPlayerBucketEmptyEvent = null;
+            return itemInHand;
+        }
+        // Paper end - Fix PlayerBucketEmptyEvent result itemstack
         return !player.hasInfiniteMaterials() ? new ItemStack(Items.BUCKET) : stack;
     }
 
@@ -114,6 +142,12 @@
 
     @Override
     public boolean emptyContents(@Nullable Player player, Level world, BlockPos pos, @Nullable BlockHitResult hitResult) {
+        // CraftBukkit start
+        return this.emptyContents(player, world, pos, hitResult, null, null, null, InteractionHand.MAIN_HAND);
+    }
+
+    public boolean emptyContents(Player entityhuman, Level world, BlockPos blockposition, @Nullable BlockHitResult movingobjectpositionblock, Direction enumdirection, BlockPos clicked, ItemStack itemstack, InteractionHand enumhand) {
+        // CraftBukkit end
         Fluid fluidtype = this.content;
 
         if (!(fluidtype instanceof FlowingFluid fluidtypeflowing)) {
@@ -126,7 +160,7 @@
             boolean flag1;
             label70:
             {
-                iblockdata = world.getBlockState(pos);
+                iblockdata = world.getBlockState(blockposition);
                 block = iblockdata.getBlock();
                 flag = iblockdata.canBeReplaced(this.content);
                 if (!iblockdata.isAir() && !flag) {
@@ -134,7 +168,7 @@
                     {
                         if (block instanceof LiquidBlockContainer) {
                             ifluidcontainer = (LiquidBlockContainer) block;
-                            if (ifluidcontainer.canPlaceLiquid(player, world, pos, iblockdata, this.content)) {
+                            if (ifluidcontainer.canPlaceLiquid(entityhuman, world, blockposition, iblockdata, this.content)) {
                                 break label67;
                             }
                         }
@@ -149,14 +183,25 @@
 
             boolean flag2 = flag1;
 
+            // CraftBukkit start
+            if (flag2 && entityhuman != null) {
+                PlayerBucketEmptyEvent event = CraftEventFactory.callPlayerBucketEmptyEvent((ServerLevel) world, entityhuman, blockposition, clicked, enumdirection, itemstack, enumhand);
+                if (event.isCancelled()) {
+                    ((ServerPlayer) entityhuman).connection.send(new ClientboundBlockUpdatePacket(world, blockposition)); // SPIGOT-4238: needed when looking through entity
+                    ((ServerPlayer) entityhuman).getBukkitEntity().updateInventory(); // SPIGOT-4541
+                    return false;
+                }
+                itemLeftInHandAfterPlayerBucketEmptyEvent = event.getItemStack() != null ? event.getItemStack().equals(CraftItemStack.asNewCraftStack(net.minecraft.world.item.Items.BUCKET)) ? null : CraftItemStack.asNMSCopy(event.getItemStack()) : ItemStack.EMPTY; // Paper - Fix PlayerBucketEmptyEvent result itemstack
+            }
+            // CraftBukkit end
             if (!flag2) {
-                return hitResult != null && this.emptyContents(player, world, hitResult.getBlockPos().relative(hitResult.getDirection()), (BlockHitResult) null);
+                return movingobjectpositionblock != null && this.emptyContents(entityhuman, world, movingobjectpositionblock.getBlockPos().relative(movingobjectpositionblock.getDirection()), (BlockHitResult) null, enumdirection, clicked, itemstack, enumhand); // CraftBukkit
             } else if (world.dimensionType().ultraWarm() && this.content.is(FluidTags.WATER)) {
-                int i = pos.getX();
-                int j = pos.getY();
-                int k = pos.getZ();
+                int i = blockposition.getX();
+                int j = blockposition.getY();
+                int k = blockposition.getZ();
 
-                world.playSound(player, pos, SoundEvents.FIRE_EXTINGUISH, SoundSource.BLOCKS, 0.5F, 2.6F + (world.random.nextFloat() - world.random.nextFloat()) * 0.8F);
+                world.playSound(entityhuman, blockposition, SoundEvents.FIRE_EXTINGUISH, SoundSource.BLOCKS, 0.5F, 2.6F + (world.random.nextFloat() - world.random.nextFloat()) * 0.8F);
 
                 for (int l = 0; l < 8; ++l) {
                     world.addParticle(ParticleTypes.LARGE_SMOKE, (double) i + Math.random(), (double) j + Math.random(), (double) k + Math.random(), 0.0D, 0.0D, 0.0D);
@@ -167,20 +212,20 @@
                 if (block instanceof LiquidBlockContainer) {
                     ifluidcontainer = (LiquidBlockContainer) block;
                     if (this.content == Fluids.WATER) {
-                        ifluidcontainer.placeLiquid(world, pos, iblockdata, fluidtypeflowing.getSource(false));
-                        this.playEmptySound(player, world, pos);
+                        ifluidcontainer.placeLiquid(world, blockposition, iblockdata, fluidtypeflowing.getSource(false));
+                        this.playEmptySound(entityhuman, world, blockposition);
                         return true;
                     }
                 }
 
                 if (!world.isClientSide && flag && !iblockdata.liquid()) {
-                    world.destroyBlock(pos, true);
+                    world.destroyBlock(blockposition, true);
                 }
 
-                if (!world.setBlock(pos, this.content.defaultFluidState().createLegacyBlock(), 11) && !iblockdata.getFluidState().isSource()) {
+                if (!world.setBlock(blockposition, this.content.defaultFluidState().createLegacyBlock(), 11) && !iblockdata.getFluidState().isSource()) {
                     return false;
                 } else {
-                    this.playEmptySound(player, world, pos);
+                    this.playEmptySound(entityhuman, world, blockposition);
                     return true;
                 }
             }