From a2168845b8116970c6f9f8dffa77bb757715365f 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/server/PacketDataSerializer.java b/src/main/java/net/minecraft/server/PacketDataSerializer.java
index bf475303b..db2fe836c 100644
--- a/src/main/java/net/minecraft/server/PacketDataSerializer.java
+++ b/src/main/java/net/minecraft/server/PacketDataSerializer.java
@@ -247,6 +247,10 @@ public class PacketDataSerializer extends ByteBuf {
             NBTTagCompound nbttagcompound = null;
 
             if (item.usesDurability() || item.m()) {
+                // Spigot start - filter
+                itemstack = itemstack.cloneItemStack();
+                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 494f9a672..c88204ff0 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaBook.java
@@ -19,6 +19,10 @@ 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");
@@ -55,11 +59,11 @@ public class CraftMetaBook extends CraftMetaItem implements BookMeta {
         super(tag);
 
         if (tag.hasKey(BOOK_TITLE.NBT)) {
-            this.title = tag.getString(BOOK_TITLE.NBT);
+            this.title = limit( tag.getString(BOOK_TITLE.NBT), 1024 ); // Spigot
         }
 
         if (tag.hasKey(BOOK_AUTHOR.NBT)) {
-            this.author = tag.getString(BOOK_AUTHOR.NBT);
+            this.author = limit( tag.getString(BOOK_AUTHOR.NBT), 1024 ); // Spigot
         }
 
         boolean resolved = false;
@@ -84,7 +88,7 @@ public class CraftMetaBook extends CraftMetaItem implements BookMeta {
                         // Ignore and treat as an old book
                     }
                 }
-                addPage(page);
+                addPage( limit( page, 2048 ) ); // Spigot
             }
         }
     }
diff --git a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
index 2ce976cf7..e25406c60 100644
--- a/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
+++ b/src/main/java/org/bukkit/craftbukkit/inventory/CraftMetaItem.java
@@ -79,6 +79,10 @@ 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:
  *
@@ -324,7 +328,7 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
 
             if (display.hasKey(NAME.NBT)) {
                 try {
-                    displayName = IChatBaseComponent.ChatSerializer.a(display.getString(NAME.NBT));
+                    displayName = IChatBaseComponent.ChatSerializer.a( limit( display.getString(NAME.NBT), 1024 ) ); // Spigot
                 } catch (JsonParseException ex) {
                     // Ignore (stripped like Vanilla)
                 }
@@ -332,7 +336,7 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
 
             if (display.hasKey(LOCNAME.NBT)) {
                 try {
-                    locName = IChatBaseComponent.ChatSerializer.a(display.getString(LOCNAME.NBT));
+                    locName = IChatBaseComponent.ChatSerializer.a( limit( display.getString(LOCNAME.NBT), 1024 ) ); // Spigot
                 } catch (JsonParseException ex) {
                     // Ignore (stripped like Vanilla)
                 }
@@ -343,7 +347,7 @@ class CraftMetaItem implements ItemMeta, Damageable, Repairable, BlockDataMeta {
                 lore = new ArrayList<IChatBaseComponent>(list.size());
 
                 for (int index = 0; index < list.size(); index++) {
-                    String line = list.getString(index);
+                    String line = limit( list.getString(index), 8192 ); // Spigot
                     try {
                         lore.add(IChatBaseComponent.ChatSerializer.a(line));
                     } catch (JsonParseException ex) {
diff --git a/src/main/java/org/spigotmc/ValidateUtils.java b/src/main/java/org/spigotmc/ValidateUtils.java
new file mode 100644
index 000000000..58a953481
--- /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;
+    }
+}
-- 
2.20.1