Paper/patches/server/0520-Item-Rarity-API.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Jake Potrebic <jake.m.potrebic@gmail.com>
Date: Fri, 12 Mar 2021 17:09:42 -0800
Subject: [PATCH] Item Rarity API

== AT ==
public net.minecraft.world.item.Item rarity

diff --git a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
index a3366affccd901f35e5a018f4fb7614c621d2912..1b4ea6cd4388b8d273816725dcd15d16f99d5695 100644
--- a/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
+++ b/src/main/java/org/bukkit/craftbukkit/util/CraftMagicNumbers.java
@@ -538,6 +538,20 @@ public final class CraftMagicNumbers implements UnsafeValues {
     public String getMainLevelName() {
         return ((net.minecraft.server.dedicated.DedicatedServer) net.minecraft.server.MinecraftServer.getServer()).getProperties().levelName;
     }
+
+    @Override
+    public io.papermc.paper.inventory.ItemRarity getItemRarity(org.bukkit.Material material) {
+        Item item = getItem(material);
+        if (item == null) {
+            throw new IllegalArgumentException(material + " is not an item, and rarity does not apply to blocks");
+        }
+        return io.papermc.paper.inventory.ItemRarity.values()[item.components().getOrDefault(net.minecraft.core.component.DataComponents.RARITY, net.minecraft.world.item.Rarity.COMMON).ordinal()];
+    }
+
+    @Override
+    public io.papermc.paper.inventory.ItemRarity getItemStackRarity(org.bukkit.inventory.ItemStack itemStack) {
+        return io.papermc.paper.inventory.ItemRarity.values()[itemStack.getRarity().ordinal()];
+    }
     // Paper end
 
     /**
diff --git a/src/test/java/io/papermc/paper/inventory/ItemRarityTest.java b/src/test/java/io/papermc/paper/inventory/ItemRarityTest.java
new file mode 100644
index 0000000000000000000000000000000000000000..d310f86c57e4521ad7666d3f738f53ac83d221f2
--- /dev/null
+++ b/src/test/java/io/papermc/paper/inventory/ItemRarityTest.java
@@ -0,0 +1,24 @@
+package io.papermc.paper.inventory;
+
+import io.papermc.paper.adventure.PaperAdventure;
+import net.minecraft.world.item.Rarity;
+import org.junit.jupiter.api.Test;
+
+import static org.junit.jupiter.api.Assertions.assertEquals;
+
+public class ItemRarityTest {
+
+    @Test
+    public void testConvertFromNmsToBukkit() {
+        for (Rarity nmsRarity : Rarity.values()) {
+            assertEquals(ItemRarity.values()[nmsRarity.ordinal()].name(), nmsRarity.name(), "rarity names are mis-matched");
+        }
+    }
+
+    @Test
+    public void testRarityFormatting() {
+        for (Rarity nmsRarity : Rarity.values()) {
+            assertEquals(nmsRarity.color, PaperAdventure.asVanilla(ItemRarity.values()[nmsRarity.ordinal()].color), "rarity formatting is mis-matched");
+        }
+    }
+}