PaperMC/paper-server/nms-patches/net/minecraft/world/inventory/TransientCraftingContainer.patch

--- a/net/minecraft/world/inventory/TransientCraftingContainer.java
+++ b/net/minecraft/world/inventory/TransientCraftingContainer.java
@@ -8,6 +8,16 @@
 import net.minecraft.world.entity.player.EntityHuman;
 import net.minecraft.world.item.ItemStack;
 
+// CraftBukkit start
+import java.util.List;
+import net.minecraft.world.IInventory;
+import net.minecraft.world.item.crafting.RecipeHolder;
+import org.bukkit.Location;
+import org.bukkit.craftbukkit.entity.CraftHumanEntity;
+import org.bukkit.entity.HumanEntity;
+import org.bukkit.event.inventory.InventoryType;
+// CraftBukkit end
+
 public class TransientCraftingContainer implements InventoryCrafting {
 
     private final NonNullList<ItemStack> items;
@@ -15,6 +25,68 @@
     private final int height;
     private final Container menu;
 
+    // CraftBukkit start - add fields
+    public List<HumanEntity> transaction = new java.util.ArrayList<HumanEntity>();
+    private RecipeHolder<?> currentRecipe;
+    public IInventory resultInventory;
+    private EntityHuman owner;
+    private int maxStack = MAX_STACK;
+
+    public List<ItemStack> getContents() {
+        return this.items;
+    }
+
+    public void onOpen(CraftHumanEntity who) {
+        transaction.add(who);
+    }
+
+    public InventoryType getInvType() {
+        return items.size() == 4 ? InventoryType.CRAFTING : InventoryType.WORKBENCH;
+    }
+
+    public void onClose(CraftHumanEntity who) {
+        transaction.remove(who);
+    }
+
+    public List<HumanEntity> getViewers() {
+        return transaction;
+    }
+
+    public org.bukkit.inventory.InventoryHolder getOwner() {
+        return (owner == null) ? null : owner.getBukkitEntity();
+    }
+
+    @Override
+    public int getMaxStackSize() {
+        return maxStack;
+    }
+
+    public void setMaxStackSize(int size) {
+        maxStack = size;
+        resultInventory.setMaxStackSize(size);
+    }
+
+    @Override
+    public Location getLocation() {
+        return menu instanceof ContainerWorkbench ? ((ContainerWorkbench) menu).access.getLocation() : owner.getBukkitEntity().getLocation();
+    }
+
+    @Override
+    public RecipeHolder<?> getCurrentRecipe() {
+        return currentRecipe;
+    }
+
+    @Override
+    public void setCurrentRecipe(RecipeHolder<?> currentRecipe) {
+        this.currentRecipe = currentRecipe;
+    }
+
+    public TransientCraftingContainer(Container container, int i, int j, EntityHuman player) {
+        this(container, i, j);
+        this.owner = player;
+    }
+    // CraftBukkit end
+
     public TransientCraftingContainer(Container container, int i, int j) {
         this(container, i, j, NonNullList.withSize(i * j, ItemStack.EMPTY));
     }