From 66560efed67192f3ba9414835980c1e52ded9ff5 Mon Sep 17 00:00:00 2001
From: Thinkofdeath <thinkofdeath@spigotmc.org>
Date: Wed, 2 Jul 2014 23:35:51 +0100
Subject: [PATCH] Better item validation


diff --git a/src/main/java/net/minecraft/network/PacketDataSerializer.java b/src/main/java/net/minecraft/network/PacketDataSerializer.java
index fb8c0e8dcc..e083d259c8 100644
--- a/src/main/java/net/minecraft/network/PacketDataSerializer.java
+++ b/src/main/java/net/minecraft/network/PacketDataSerializer.java
@@ -626,6 +626,10 @@ public class PacketDataSerializer extends ByteBuf {
             NBTTagCompound nbttagcompound = null;
 
             if (item.canBeDepleted() || item.shouldOverrideMultiplayerNbt()) {
+                // Spigot start - filter
+                itemstack = itemstack.copy();
+                CraftItemStack.setItemMeta(itemstack, CraftItemStack.getItemMeta(itemstack));
+                // Spigot end
                 nbttagcompound = itemstack.getTag();
             }
 
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
index 03b5764552..dfde2c619c 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
@@ -20,6 +20,10 @@ import org.bukkit.craftbukkit.util.CraftChatMessage;
 import org.bukkit.craftbukkit.util.CraftMagicNumbers;
 import org.bukkit.inventory.meta.BookMeta;
 
+// Spigot start
+import static org.spigotmc.ValidateUtils.*;
+// Spigot end
+
 @DelegateDeserialization(SerializableMeta.class)
 public class CraftMetaBook extends CraftMetaItem implements BookMeta {
     static final ItemMetaKey BOOK_TITLE = new ItemMetaKey("title");
@@ -80,11 +84,11 @@ public class CraftMetaBook extends CraftMetaItem implements BookMeta {
         super(tag);
 
         if (tag.contains(BOOK_TITLE.NBT)) {
-            this.title = tag.getString(BOOK_TITLE.NBT);
+            this.title = limit( tag.getString(BOOK_TITLE.NBT), 8192 ); // Spigot
         }
 
         if (tag.contains(BOOK_AUTHOR.NBT)) {
-            this.author = tag.getString(BOOK_AUTHOR.NBT);
+            this.author = limit( tag.getString(BOOK_AUTHOR.NBT), 8192 ); // Spigot
         }
 
         if (tag.contains(RESOLVED.NBT)) {
@@ -112,7 +116,7 @@ public class CraftMetaBook extends CraftMetaItem implements BookMeta {
                 } else {
                     page = validatePage(page);
                 }
-                this.pages.add(page);
+                this.pages.add( limit( page, 16384 ) ); // Spigot
             }
         }
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
index bf5fb75161..29f7d5835e 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
@@ -77,6 +77,10 @@ import org.bukkit.inventory.meta.Repairable;
 import org.bukkit.inventory.meta.tags.CustomItemTagContainer;
 import org.bukkit.persistence.PersistentDataContainer;
 
+// Spigot start
+import static org.spigotmc.ValidateUtils.*;
+// Spigot end
+
 /**
  * Children must include the following:
  *
@@ -331,18 +335,18 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
             NBTTagCompound display = tag.getCompound(DISPLAY.NBT);
 
             if (display.contains(NAME.NBT)) {
-                displayName = display.getString(NAME.NBT);
+                displayName = limit( display.getString(NAME.NBT), 8192 ); // Spigot
             }
 
             if (display.contains(LOCNAME.NBT)) {
-                locName = display.getString(LOCNAME.NBT);
+                locName = limit( display.getString(LOCNAME.NBT), 8192 ); // Spigot
             }
 
             if (display.contains(LORE.NBT)) {
                 NBTTagList list = display.getList(LORE.NBT, CraftMagicNumbers.NBT.TAG_STRING);
                 lore = new ArrayList<String>(list.size());
                 for (int index = 0; index < list.size(); index++) {
-                    String line = list.getString(index);
+                    String line = limit( list.getString(index), 8192 ); // Spigot
                     lore.add(line);
                 }
             }
diff --git a/src/main/java/org/spigotmc/ValidateUtils.java b/src/main/java/org/spigotmc/ValidateUtils.java
new file mode 100644
index 0000000000..58a9534816
--- /dev/null
+++ b/src/main/java/org/spigotmc/ValidateUtils.java
@@ -0,0 +1,14 @@
+package org.spigotmc;
+
+public class ValidateUtils
+{
+
+    public static String limit(String str, int limit)
+    {
+        if ( str.length() > limit )
+        {
+            return str.substring( 0, limit );
+        }
+        return str;
+    }
+}
-- 
2.42.0