From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001 From: Mariell Hoversholm Date: Thu, 30 Apr 2020 16:56:31 +0200 Subject: [PATCH] Add Raw Byte ItemStack Serialization Serializes using NBT which is safer for server data migrations than bukkits format. Co-authored-by: Nassim Jahnke diff --git a/src/main/java/org/bukkit/UnsafeValues.java b/src/main/java/org/bukkit/UnsafeValues.java index 45ed0007d6de20b98794b3ccaef57aed213e72d4..dd81e309c584e37e4bc7644261ecc649e1237570 100644 --- a/src/main/java/org/bukkit/UnsafeValues.java +++ b/src/main/java/org/bukkit/UnsafeValues.java @@ -159,5 +159,9 @@ public interface UnsafeValues { default com.destroystokyo.paper.util.VersionFetcher getVersionFetcher() { return new com.destroystokyo.paper.util.VersionFetcher.DummyVersionFetcher(); } + + byte[] serializeItem(ItemStack item); + + ItemStack deserializeItem(byte[] data); // Paper end } diff --git a/src/main/java/org/bukkit/inventory/ItemStack.java b/src/main/java/org/bukkit/inventory/ItemStack.java index e9c29fc1db686b80bc2477d78ec2b361b8600b9e..af09398e0864d338da530495bfd577db8adbe65a 100644 --- a/src/main/java/org/bukkit/inventory/ItemStack.java +++ b/src/main/java/org/bukkit/inventory/ItemStack.java @@ -661,6 +661,117 @@ public class ItemStack implements Cloneable, ConfigurationSerializable, Translat return Bukkit.getServer().getItemFactory().ensureServerConversions(this); } + /** + * Deserializes this itemstack from raw NBT bytes. NBT is safer for data migrations as it will + * use the built in data converter instead of bukkits dangerous serialization system. + * + * This expects that the DataVersion was stored on the root of the Compound, as saved from + * the {@link #serializeAsBytes()} API returned. + * @param bytes bytes representing an item in NBT + * @return ItemStack migrated to this version of Minecraft if needed. + */ + @NotNull + public static ItemStack deserializeBytes(@NotNull byte[] bytes) { + return org.bukkit.Bukkit.getUnsafe().deserializeItem(bytes); + } + + /** + * Serializes this itemstack to raw bytes in NBT. NBT is safer for data migrations as it will + * use the built in data converter instead of bukkits dangerous serialization system. + * @return bytes representing this item in NBT. + */ + @NotNull + public byte[] serializeAsBytes() { + return org.bukkit.Bukkit.getUnsafe().serializeItem(this); + } + + /** + * The current version byte of the item array format used in {@link #serializeItemsAsBytes(java.util.Collection)} + * and {@link #deserializeItemsFromBytes(byte[])} respectively. + */ + private static final byte ARRAY_SERIALIZATION_VERSION = 1; + + /** + * Serializes a collection of items to raw bytes in NBT. Serializes null items as {@link #empty()}. + *

+ * If you need a string representation to put into a file, you can for example use {@link java.util.Base64} encoding. + * + * @param items items to serialize + * @return bytes representing the items in NBT + * @see #serializeAsBytes() + */ + public static byte @NotNull [] serializeItemsAsBytes(java.util.@NotNull Collection items) { + try (final java.io.ByteArrayOutputStream outputStream = new java.io.ByteArrayOutputStream()) { + final java.io.DataOutput output = new java.io.DataOutputStream(outputStream); + output.writeByte(ARRAY_SERIALIZATION_VERSION); + output.writeInt(items.size()); + for (final ItemStack item : items) { + if (item == null || item.isEmpty()) { + // Ensure the correct order by including empty/null items + output.writeInt(0); + continue; + } + + final byte[] itemBytes = item.serializeAsBytes(); + output.writeInt(itemBytes.length); + output.write(itemBytes); + } + return outputStream.toByteArray(); + } catch (final java.io.IOException e) { + throw new RuntimeException("Error while writing itemstack", e); + } + } + + /** + * Serializes a collection of items to raw bytes in NBT. Serializes null items as {@link #empty()}. + *

+ * If you need a string representation to put into a file, you can for example use {@link java.util.Base64} encoding. + * + * @param items items to serialize + * @return bytes representing the items in NBT + * @see #serializeAsBytes() + */ + public static byte @NotNull [] serializeItemsAsBytes(@Nullable ItemStack @NotNull [] items) { + return serializeItemsAsBytes(java.util.Arrays.asList(items)); + } + + /** + * Deserializes this itemstack from raw NBT bytes. + *

+ * If you need a string representation to put into a file, you can for example use {@link java.util.Base64} encoding. + * + * @param bytes bytes representing an item in NBT + * @return ItemStack array migrated to this version of Minecraft if needed + * @see #deserializeBytes(byte[]) + */ + public static @NotNull ItemStack @NotNull [] deserializeItemsFromBytes(final byte @NotNull [] bytes) { + try (final java.io.ByteArrayInputStream inputStream = new java.io.ByteArrayInputStream(bytes)) { + final java.io.DataInputStream input = new java.io.DataInputStream(inputStream); + final byte version = input.readByte(); + if (version != ARRAY_SERIALIZATION_VERSION) { + throw new IllegalArgumentException("Unsupported version or bad data: " + version); + } + + final int count = input.readInt(); + final ItemStack[] items = new ItemStack[count]; + for (int i = 0; i < count; i++) { + final int length = input.readInt(); + if (length == 0) { + // Empty item, keep entry as empty + items[i] = ItemStack.empty(); + continue; + } + + final byte[] itemBytes = new byte[length]; + input.read(itemBytes); + items[i] = ItemStack.deserializeBytes(itemBytes); + } + return items; + } catch (final java.io.IOException e) { + throw new RuntimeException("Error while reading itemstack", e); + } + } + /** * Gets the Display name as seen in the Client. * Currently the server only supports the English language. To override this, diff --git a/src/main/java/org/bukkit/util/io/BukkitObjectInputStream.java b/src/main/java/org/bukkit/util/io/BukkitObjectInputStream.java index 0f8eb97bd5e2f8b0f0cc03f7c4342aae06c4520c..6c074ff2dcfc279657037013b9b54890d7c8a533 100644 --- a/src/main/java/org/bukkit/util/io/BukkitObjectInputStream.java +++ b/src/main/java/org/bukkit/util/io/BukkitObjectInputStream.java @@ -14,7 +14,11 @@ import org.bukkit.configuration.serialization.ConfigurationSerialization; *

* Behavior of implementations extending this class is not guaranteed across * future versions. + * @deprecated Object streams on their own are not safe. For safer and more consistent serialization of items, + * use {@link org.bukkit.inventory.ItemStack#serializeAsBytes()} or + * {@link org.bukkit.inventory.ItemStack#serializeItemsAsBytes(java.util.Collection)}. */ +@Deprecated(since = "1.21") // Paper public class BukkitObjectInputStream extends ObjectInputStream { /** diff --git a/src/main/java/org/bukkit/util/io/BukkitObjectOutputStream.java b/src/main/java/org/bukkit/util/io/BukkitObjectOutputStream.java index dd1b9ee5f57773f07924aa311823fd8d63195cb2..4e24e7c73271a579db2c4309951693dfb2fecceb 100644 --- a/src/main/java/org/bukkit/util/io/BukkitObjectOutputStream.java +++ b/src/main/java/org/bukkit/util/io/BukkitObjectOutputStream.java @@ -14,7 +14,11 @@ import org.bukkit.configuration.serialization.ConfigurationSerializable; *

* Behavior of implementations extending this class is not guaranteed across * future versions. + * @deprecated Object streams on their own are not safe. For safer and more consistent serialization of items, + * use {@link org.bukkit.inventory.ItemStack#serializeAsBytes()} or + * {@link org.bukkit.inventory.ItemStack#serializeItemsAsBytes(java.util.Collection)}. */ +@Deprecated(since = "1.21") // Paper public class BukkitObjectOutputStream extends ObjectOutputStream { /**