Paper/nms-patches/ItemStack.patch

--- a/net/minecraft/server/ItemStack.java
+++ b/net/minecraft/server/ItemStack.java
@@ -6,6 +6,19 @@
 import java.util.Random;
 import javax.annotation.Nullable;
 
+// CraftBukkit start
+import java.util.List;
+import java.util.Map;
+
+import org.bukkit.Location;
+import org.bukkit.TreeType;
+import org.bukkit.block.BlockState;
+import org.bukkit.craftbukkit.block.CraftBlockState;
+import org.bukkit.craftbukkit.util.CraftMagicNumbers;
+import org.bukkit.entity.Player;
+import org.bukkit.event.world.StructureGrowEvent;
+// CraftBukkit end
+
 public final class ItemStack {
 
     public static final ItemStack a = new ItemStack((Item) null);
@@ -46,6 +59,15 @@
         this.item = item;
         this.damage = j;
         this.count = i;
+        // CraftBukkit start - Pass to setData to do filtering
+        if (MinecraftServer.getServer() != null) {
+            this.setData(j);
+            NBTTagCompound savedStack = new NBTTagCompound();
+            this.save(savedStack);
+            MinecraftServer.getServer().getDataConverterManager().a(DataConverterTypes.ITEM_INSTANCE, savedStack); // PAIL: convert
+            this.load(savedStack);
+        }
+        // CraftBukkit end
         if (this.damage < 0) {
             this.damage = 0;
         }
@@ -54,20 +76,32 @@
     }
 
     private void F() {
+        if (this.g && this == ItemStack.a) throw new AssertionError("TRAP"); // CraftBukkit
         this.g = this.isEmpty();
     }
 
-    public ItemStack(NBTTagCompound nbttagcompound) {
+    // CraftBukkit - break into own method
+    public void load(NBTTagCompound nbttagcompound) {
         this.item = Item.b(nbttagcompound.getString("id"));
         this.count = nbttagcompound.getByte("Count");
-        this.damage = Math.max(0, nbttagcompound.getShort("Damage"));
+        // CraftBukkit start - Route through setData for filtering
+        // this.damage = Math.max(0, nbttagcompound.getShort("Damage"));
+        this.setData(Math.max(0, nbttagcompound.getShort("Damage")));
+        // CraftBukkit end
+
         if (nbttagcompound.hasKeyOfType("tag", 10)) {
-            this.tag = nbttagcompound.getCompound("tag");
+            // CraftBukkit start - make defensive copy as this data may be coming from the save thread
+            this.tag = (NBTTagCompound) nbttagcompound.getCompound("tag").clone();
             if (this.item != null) {
-                this.item.a(nbttagcompound);
+                this.item.a(this.tag);
+                // CraftBukkit end
             }
         }
+    }
 
+    public ItemStack(NBTTagCompound nbttagcompound) {
+        this.load(nbttagcompound);
+        // CraftBukkit end
         this.F();
     }
 
@@ -94,11 +128,137 @@
     }
 
     public EnumInteractionResult placeItem(EntityHuman entityhuman, World world, BlockPosition blockposition, EnumHand enumhand, EnumDirection enumdirection, float f, float f1, float f2) {
+        // CraftBukkit start - handle all block place event logic here
+        int oldData = this.getData();
+        int oldCount = this.getCount();
+
+        if (!(this.getItem() instanceof ItemBucket)) { // if not bucket
+            world.captureBlockStates = true;
+            // special case bonemeal
+            if (this.getItem() instanceof ItemDye && this.getData() == 15) {
+                Block block = world.getType(blockposition).getBlock();
+                if (block == Blocks.SAPLING || block instanceof BlockMushroom) {
+                    world.captureTreeGeneration = true;
+                }
+            }
+        }
         EnumInteractionResult enuminteractionresult = this.getItem().a(entityhuman, world, blockposition, enumhand, enumdirection, f, f1, f2);
+        int newData = this.getData();
+        int newCount = this.getCount();
+        this.setCount(oldCount);
+        this.setData(oldData);
+        world.captureBlockStates = false;
+        if (enuminteractionresult == EnumInteractionResult.SUCCESS && world.captureTreeGeneration && world.capturedBlockStates.size() > 0) {
+            world.captureTreeGeneration = false;
+            Location location = new Location(world.getWorld(), blockposition.getX(), blockposition.getY(), blockposition.getZ());
+            TreeType treeType = BlockSapling.treeType;
+            BlockSapling.treeType = null;
+            List<BlockState> blocks = (List<BlockState>) world.capturedBlockStates.clone();
+            world.capturedBlockStates.clear();
+            StructureGrowEvent event = null;
+            if (treeType != null) {
+                boolean isBonemeal = getItem() == Items.DYE && oldData == 15;
+                event = new StructureGrowEvent(location, treeType, isBonemeal, (Player) entityhuman.getBukkitEntity(), blocks);
+                org.bukkit.Bukkit.getPluginManager().callEvent(event);
+            }
+            if (event == null || !event.isCancelled()) {
+                // Change the stack to its new contents if it hasn't been tampered with.
+                if (this.getCount() == oldCount && this.getData() == oldData) {
+                    this.setData(newData);
+                    this.setCount(newCount);
+                }
+                for (BlockState blockstate : blocks) {
+                    blockstate.update(true);
+                }
+            }
+
+            return enuminteractionresult;
+        }
+        world.captureTreeGeneration = false;
 
         if (enuminteractionresult == EnumInteractionResult.SUCCESS) {
-            entityhuman.b(StatisticList.b(this.item));
+            org.bukkit.event.block.BlockPlaceEvent placeEvent = null;
+            List<BlockState> blocks = (List<BlockState>) world.capturedBlockStates.clone();
+            world.capturedBlockStates.clear();
+            if (blocks.size() > 1) {
+                placeEvent = org.bukkit.craftbukkit.event.CraftEventFactory.callBlockMultiPlaceEvent(world, entityhuman, enumhand, blocks, blockposition.getX(), blockposition.getY(), blockposition.getZ());
+            } else if (blocks.size() == 1) {
+                placeEvent = org.bukkit.craftbukkit.event.CraftEventFactory.callBlockPlaceEvent(world, entityhuman, enumhand, blocks.get(0), blockposition.getX(), blockposition.getY(), blockposition.getZ());
+            }
+
+            if (placeEvent != null && (placeEvent.isCancelled() || !placeEvent.canBuild())) {
+                enuminteractionresult = EnumInteractionResult.FAIL; // cancel placement
+                // PAIL: Remove this when MC-99075 fixed
+                placeEvent.getPlayer().updateInventory();
+                // revert back all captured blocks
+                for (BlockState blockstate : blocks) {
+                    blockstate.update(true, false);
+                }
+            } else {
+                // Change the stack to its new contents if it hasn't been tampered with.
+                if (this.getCount() == oldCount && this.getData() == oldData) {
+                    this.setData(newData);
+                    this.setCount(newCount);
+                }
+                for (BlockState blockstate : blocks) {
+                    int x = blockstate.getX();
+                    int y = blockstate.getY();
+                    int z = blockstate.getZ();
+                    int updateFlag = ((CraftBlockState) blockstate).getFlag();
+                    org.bukkit.Material mat = blockstate.getType();
+                    Block oldBlock = CraftMagicNumbers.getBlock(mat);
+                    BlockPosition newblockposition = new BlockPosition(x, y, z);
+                    IBlockData block = world.getType(newblockposition);
+
+                    if (!(block instanceof BlockTileEntity)) { // Containers get placed automatically
+                        block.getBlock().onPlace(world, newblockposition, block);
+                    }
+
+                    world.notifyAndUpdatePhysics(newblockposition, null, oldBlock.getBlockData(), block, updateFlag); // send null chunk as chunk.k() returns false by this point
+                }
+
+                for (Map.Entry<BlockPosition, TileEntity> e : world.capturedTileEntities.entrySet()) {
+                    world.setTileEntity(e.getKey(), e.getValue());
+                }
+
+                // Special case juke boxes as they update their tile entity. Copied from ItemRecord.
+                // PAIL: checkme on updates.
+                if (this.item instanceof ItemRecord) {
+                    ((BlockJukeBox) Blocks.JUKEBOX).a(world, blockposition, world.getType(blockposition), this);
+                    world.a((EntityHuman) null, 1010, blockposition, Item.getId(this.item));
+                    this.subtract(1);
+                    entityhuman.b(StatisticList.Z);
+                }
+
+                if (this.item == Items.SKULL) { // Special case skulls to allow wither spawns to be cancelled
+                    BlockPosition bp = blockposition;
+                    if (!world.getType(blockposition).getBlock().a(world, blockposition)) {
+                        if (!world.getType(blockposition).getMaterial().isBuildable()) {
+                            bp = null;
+                        } else {
+                            bp = bp.shift(enumdirection);
+                        }
+                    }
+                    if (bp != null) {
+                        TileEntity te = world.getTileEntity(bp);
+                        if (te instanceof TileEntitySkull) {
+                            Blocks.SKULL.a(world, bp, (TileEntitySkull) te);
+                        }
+                    }
+                }
+
+                // SPIGOT-1288 - play sound stripped from ItemBlock
+                if (this.item instanceof ItemBlock) {
+                    SoundEffectType soundeffecttype = ((ItemBlock) this.item).getBlock().getStepSound();
+                    world.a(entityhuman, blockposition, soundeffecttype.e(), SoundCategory.BLOCKS, (soundeffecttype.a() + 1.0F) / 2.0F, soundeffecttype.b() * 0.8F);
+                }
+
+                entityhuman.b(StatisticList.b(this.item));
+            }
         }
+        world.capturedTileEntities.clear();
+        world.capturedBlockStates.clear();
+        // CraftBukkit end
 
         return enuminteractionresult;
     }
@@ -122,7 +282,7 @@
         nbttagcompound.setByte("Count", (byte) this.count);
         nbttagcompound.setShort("Damage", (short) this.damage);
         if (this.tag != null) {
-            nbttagcompound.set("tag", this.tag);
+            nbttagcompound.set("tag", this.tag.clone()); // CraftBukkit - make defensive copy, data is going to another thread
         }
 
         return nbttagcompound;
@@ -157,11 +317,30 @@
     }
 
     public void setData(int i) {
+        // CraftBukkit start - Filter out data for items that shouldn't have it
+        // The crafting system uses this value for a special purpose so we have to allow it
+        if (i == 32767) {
+            this.damage = i;
+            return;
+        }
+
+        // Is this a block?
+        if (CraftMagicNumbers.getBlock(CraftMagicNumbers.getId(this.getItem())) != Blocks.AIR) {
+            // If vanilla doesn't use data on it don't allow any
+            if (!(this.usesData() || this.getItem().usesDurability())) {
+                i = 0;
+            }
+        }
+
+        // Filter invalid plant data
+        if (CraftMagicNumbers.getBlock(CraftMagicNumbers.getId(this.getItem())) == Blocks.DOUBLE_PLANT && (i > 5 || i < 0)) {
+            i = 0;
+        }
+        // CraftBukkit end
         this.damage = i;
         if (this.damage < 0) {
             this.damage = 0;
         }
-
     }
 
     public int k() {
@@ -205,6 +384,11 @@
                         entityhuman.b(StatisticList.c(this.item));
                     }
 
+                    // CraftBukkit start - Check for item breaking
+                    if (this.count == 0 && entityliving instanceof EntityHuman) {
+                        org.bukkit.craftbukkit.event.CraftEventFactory.callPlayerItemBreakEvent((EntityHuman) entityliving, this);
+                    }
+                    // CraftBukkit end
                     this.damage = 0;
                 }
 
@@ -509,6 +693,12 @@
         nbttaglist.add(nbttagcompound);
     }
 
+    @Deprecated
+    public void setItem(Item item) {
+        this.item = item;
+        this.setData(this.getData()); // CraftBukkit - Set data again to ensure it is filtered properly
+    }
+
     public IChatBaseComponent C() {
         ChatComponentText chatcomponenttext = new ChatComponentText(this.getName());