Add UnsafeValues#deserializeItemHover (#13067)

Co-authored-by: Owen1212055 <[email protected]>

Author: tal5

paper-api/src/main/java/org/bukkit/UnsafeValues.java

@@ -3,6 +3,7 @@
 import com.google.common.collect.Multimap;
 import io.papermc.paper.entity.EntitySerializationFlag;
 import io.papermc.paper.registry.RegistryKey;
+import net.kyori.adventure.text.event.HoverEvent;
 import org.bukkit.advancement.Advancement;
 import org.bukkit.attribute.Attribute;
 import org.bukkit.attribute.AttributeModifier;
@@ -384,4 +385,12 @@ default com.destroystokyo.paper.util.VersionFetcher getVersionFetcher() {
     @NotNull Map<String, Object> serializeStack(ItemStack itemStack);
 
     @NotNull ItemStack deserializeStack(@NotNull Map<String, Object> args);
+
+    /**
+     * Deserializes a {@link HoverEvent.ShowItem} hover event value into an {@code ItemStack}.
+     *
+     * @param itemHover the hover to deserialize
+     * @return the deserialized {@code ItemStack}
+     */
+    @NotNull ItemStack deserializeItemHover(HoverEvent.@NotNull ShowItem itemHover);
 }

paper-server/src/main/java/io/papermc/paper/adventure/AdventureCodecs.java

@@ -194,7 +194,7 @@ public String getSerializedName() {
         COMPONENT_CODEC.lenientOptionalFieldOf("name").forGetter(a -> Optional.ofNullable(a.value().name()))
     ).apply(instance, (key, uuid, component) -> HoverEvent.showEntity(key, uuid, component.orElse(null))));
 
-    static final MapCodec<HoverEvent<HoverEvent.ShowItem>> SHOW_ITEM_CODEC = net.minecraft.network.chat.HoverEvent.ShowItem.CODEC.xmap(internal -> {
+    public static final MapCodec<HoverEvent<HoverEvent.ShowItem>> SHOW_ITEM_CODEC = net.minecraft.network.chat.HoverEvent.ShowItem.CODEC.xmap(internal -> {
         @Subst("key") final String typeKey = internal.item().getItemHolder().unwrapKey().orElseThrow().identifier().toString();
         return HoverEvent.showItem(Key.key(typeKey), internal.item().getCount(), PaperAdventure.asAdventure(internal.item().getComponentsPatch()));
     }, adventure -> {

paper-server/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java

@@ -11,7 +11,10 @@
 import com.mojang.brigadier.exceptions.CommandSyntaxException;
 import com.mojang.logging.LogUtils;
 import com.mojang.serialization.Dynamic;
+import com.mojang.serialization.JavaOps;
 import com.mojang.serialization.JsonOps;
+import io.papermc.paper.adventure.AdventureCodecs;
+import io.papermc.paper.adventure.PaperAdventure;
 import io.papermc.paper.registry.RegistryKey;
 import java.io.File;
 import java.io.IOException;
@@ -26,6 +29,7 @@
 import java.util.logging.Level;
 import java.util.stream.Stream;
 import io.papermc.paper.entity.EntitySerializationFlag;
+import net.kyori.adventure.text.event.HoverEvent;
 import net.minecraft.SharedConstants;
 import net.minecraft.advancements.AdvancementHolder;
 import net.minecraft.commands.Commands;
@@ -39,6 +43,7 @@
 import net.minecraft.nbt.Tag;
 import net.minecraft.nbt.TagParser;
 import net.minecraft.resources.Identifier;
+import net.minecraft.resources.RegistryOps;
 import net.minecraft.server.MinecraftServer;
 import net.minecraft.server.level.ServerLevel;
 import net.minecraft.util.ProblemReporter;
@@ -56,6 +61,7 @@
 import org.bukkit.Keyed;
 import org.bukkit.Material;
 import org.bukkit.NamespacedKey;
+import org.bukkit.Registry;
 import org.bukkit.UnsafeValues;
 import org.bukkit.World;
 import org.bukkit.advancement.Advancement;
@@ -860,4 +866,15 @@ public io.papermc.paper.plugin.lifecycle.event.LifecycleEventManager<org.bukkit.
     public org.bukkit.inventory.ItemStack createEmptyStack() {
         return CraftItemStack.asCraftMirror(null);
     }
+
+    @Override
+    public ItemStack deserializeItemHover(final HoverEvent.ShowItem itemHover) {
+        final RegistryOps<Object> ops = CraftRegistry.getMinecraftRegistry().createSerializationContext(JavaOps.INSTANCE);
+        final Object encoded = AdventureCodecs.SHOW_ITEM_CODEC.codec()
+            .encodeStart(ops, HoverEvent.showItem(itemHover)).getOrThrow(IllegalStateException::new);
+
+        return CraftItemStack.asBukkitCopy(net.minecraft.network.chat.HoverEvent.ShowItem.CODEC.codec()
+            .parse(ops, encoded).getOrThrow(IllegalStateException::new)
+            .item());
+    }
 }