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Add Item serialization as json api (#11235)

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* Item serialization as json

* Add ItemStackAdapter for Gson

* A javadoc note at #serialize() and #deserialize()

* Rebase

* Move serialize closer to deserialize

* Add explaining comment about SERIALIZE_CUSTOM_AS_SNBT usage

* Apply lynxplay requests

* Forgot `@NotNull`

* Very important diff was removed

* Rebase

* Javadocs

---------

Co-authored-by: Bjarne Koll <lynxplay101@gmail.com>
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masmc05 2024-09-08 22:58:30 +03:00 committed by GitHub
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commit b09eaf2e8d
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47
patches/api/0490-Item-serialization-as-json.patch Normal file
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@ -0,0 +1,47 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: masmc05 <masmc05@gmail.com>
Date: Sun, 11 Aug 2024 03:01:52 +0300
Subject: [PATCH] Item serialization as json
diff --git a/src/main/java/org/bukkit/UnsafeValues.java b/src/main/java/org/bukkit/UnsafeValues.java
index c80e0ef587a001ee6de3f5c182cc9696d58bafeb..10c87b7c19ed3eab28fdce5f225df3767292ee0a 100644
--- a/src/main/java/org/bukkit/UnsafeValues.java
+++ b/src/main/java/org/bukkit/UnsafeValues.java
@@ -174,6 +174,36 @@ public interface UnsafeValues {
ItemStack deserializeItem(byte[] data);
+ /**
+ * Serializes this itemstack to json format.
+ * It is safe for data migrations as it will use the built-in data converter instead of bukkit's
+ * dangerous serialization system.
+ * <p>
+ * The emitted json object's format will inherently change across versions and hence should not be used for
+ * non-development purposes like plugin configurations or end-user input.
+ *
+ * @return json object representing this item.
+ * @see #deserializeItemFromJson(com.google.gson.JsonObject)
+ * @throws IllegalArgumentException if the passed itemstack is {@link ItemStack#empty()}.
+ */
+ @NotNull
+ com.google.gson.JsonObject serializeItemAsJson(@NotNull ItemStack itemStack);
+
+ /**
+ * Creates an itemstack from a json object.
+ * <p>
+ * This method expects a json object in the format emitted by {@link #serializeItemAsJson(ItemStack)}.
+ * <p>
+ * The emitted json object's format will inherently change across versions and hence should not be used for
+ * non-development purposes like plugin configurations or end-user input.
+ *
+ * @param data object representing an item in Json format
+ * @return the deserialize item stack, migrated to the latest data version if needed.
+ * @throws IllegalArgumentException if the json object is not a valid item
+ * @see #serializeItemAsJson(ItemStack)
+ */
+ @NotNull ItemStack deserializeItemFromJson(@NotNull com.google.gson.JsonObject data) throws IllegalArgumentException;
+
byte[] serializeEntity(org.bukkit.entity.Entity entity);
default org.bukkit.entity.Entity deserializeEntity(byte[] data, World world) {

73
patches/server/1060-Item-serialization-as-json.patch Normal file
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@ -0,0 +1,73 @@
From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: masmc05 <masmc05@gmail.com>
Date: Sun, 11 Aug 2024 03:01:52 +0300
Subject: [PATCH] Item serialization as json
diff --git a/src/main/java/net/minecraft/world/item/component/CustomData.java b/src/main/java/net/minecraft/world/item/component/CustomData.java
index 6b7245cf05ea4b6ce05462eb3164bce7f5d76a03..ac1914438307e8a7cc3a3b6352e88a0638f8a33b 100644
--- a/src/main/java/net/minecraft/world/item/component/CustomData.java
+++ b/src/main/java/net/minecraft/world/item/component/CustomData.java
@@ -28,7 +28,17 @@ import org.slf4j.Logger;
public final class CustomData {
private static final Logger LOGGER = LogUtils.getLogger();
public static final CustomData EMPTY = new CustomData(new CompoundTag());
- public static final Codec<CustomData> CODEC = Codec.withAlternative(CompoundTag.CODEC, TagParser.AS_CODEC)
+ // Paper start - Item serialization as json
+ public static ThreadLocal<Boolean> SERIALIZE_CUSTOM_AS_SNBT = ThreadLocal.withInitial(() -> false);
+ public static final Codec<CustomData> CODEC = Codec.either(CompoundTag.CODEC, TagParser.AS_CODEC)
+ .xmap(com.mojang.datafixers.util.Either::unwrap, data -> { // Both will be used for deserialization, but we decide which one to use for serialization
+ if (!SERIALIZE_CUSTOM_AS_SNBT.get()) {
+ return com.mojang.datafixers.util.Either.left(data); // First codec
+ } else {
+ return com.mojang.datafixers.util.Either.right(data); // Second codec
+ }
+ })
+ // Paper end - Item serialization as json
.xmap(CustomData::new, component -> component.tag);
public static final Codec<CustomData> CODEC_WITH_ID = CODEC.validate(
component -> component.getUnsafe().contains("id", 8) ? DataResult.success(component) : DataResult.error(() -> "Missing id for entity in: " + component)
diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
index 7d32c032b63b9c4674489b30c845fe2de8275808..f78744b6d6075f584d9a88612661854f3f04aed1 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
@@ -505,6 +505,39 @@ public final class CraftMagicNumbers implements UnsafeValues {
return CraftItemStack.asCraftMirror(net.minecraft.world.item.ItemStack.parse(MinecraftServer.getServer().registryAccess(), compound).orElseThrow());
}
+ @Override
+ public com.google.gson.JsonObject serializeItemAsJson(ItemStack itemStack) {
+ Preconditions.checkNotNull(itemStack, "Cannot serialize empty ItemStack");
+ Preconditions.checkArgument(!itemStack.isEmpty(), "Cannot serialize empty ItemStack");
+
+ net.minecraft.core.RegistryAccess.Frozen reg = net.minecraft.server.MinecraftServer.getServer().registryAccess();
+ com.mojang.serialization.DynamicOps<com.google.gson.JsonElement> ops = reg.createSerializationContext(com.mojang.serialization.JsonOps.INSTANCE);
+ com.google.gson.JsonObject item;
+ // Serialize as SNBT to preserve exact NBT types; vanilla codecs already can handle such deserialization.
+ net.minecraft.world.item.component.CustomData.SERIALIZE_CUSTOM_AS_SNBT.set(true);
+ try {
+ item = net.minecraft.world.item.ItemStack.CODEC.encodeStart(ops, CraftItemStack.unwrap(itemStack)).getOrThrow().getAsJsonObject();
+ } finally {
+ net.minecraft.world.item.component.CustomData.SERIALIZE_CUSTOM_AS_SNBT.set(false);
+ }
+ item.addProperty("DataVersion", this.getDataVersion());
+ return item;
+ }
+
+ @Override
+ public ItemStack deserializeItemFromJson(com.google.gson.JsonObject data) throws IllegalArgumentException {
+ Preconditions.checkNotNull(data, "null cannot be deserialized");
+
+ final int dataVersion = data.get("DataVersion").getAsInt();
+ final int currentVersion = org.bukkit.craftbukkit.util.CraftMagicNumbers.INSTANCE.getDataVersion();
+ data = ca.spottedleaf.dataconverter.minecraft.MCDataConverter.convertJson(
+ ca.spottedleaf.dataconverter.minecraft.datatypes.MCTypeRegistry.ITEM_STACK,
+ data, false, dataVersion, currentVersion
+ );
+ com.mojang.serialization.DynamicOps<com.google.gson.JsonElement> ops = MinecraftServer.getServer().registryAccess().createSerializationContext(com.mojang.serialization.JsonOps.INSTANCE);
+ return CraftItemStack.asCraftMirror(net.minecraft.world.item.ItemStack.CODEC.parse(ops, data).getOrThrow(IllegalArgumentException::new));
+ }
+
@Override
public byte[] serializeEntity(org.bukkit.entity.Entity entity) {
Preconditions.checkNotNull(entity, "null cannot be serialized");