From 937e0261403208816b70f1e54420d3d0c09c187a Mon Sep 17 00:00:00 2001
From: Melncat <melncatuwu@gmail.com>
Date: Mon, 26 Sep 2022 11:42:38 -0700
Subject: [PATCH] Add item packet serialization API (#1130)

---
 ...0053-Add-item-packet-serialize-event.patch | 60 +++++++++++++++++++
 ...0301-Add-item-packet-serialize-event.patch | 45 ++++++++++++++
 2 files changed, 105 insertions(+)
 create mode 100644 patches/api/0053-Add-item-packet-serialize-event.patch
 create mode 100644 patches/server/0301-Add-item-packet-serialize-event.patch

diff --git a/patches/api/0053-Add-item-packet-serialize-event.patch b/patches/api/0053-Add-item-packet-serialize-event.patch
new file mode 100644
index 000000000..633be5005
--- /dev/null
+++ b/patches/api/0053-Add-item-packet-serialize-event.patch
@@ -0,0 +1,60 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: MelnCat <melncatuwu@gmail.com>
+Date: Sat, 24 Sep 2022 10:50:33 -0700
+Subject: [PATCH] Add item packet serialize event
+
+
+diff --git a/src/main/java/org/purpurmc/purpur/event/packet/NetworkItemSerializeEvent.java b/src/main/java/org/purpurmc/purpur/event/packet/NetworkItemSerializeEvent.java
+new file mode 100644
+index 0000000000000000000000000000000000000000..c0da73d2ea83a6055e34894ba1c7506fc8667712
+--- /dev/null
++++ b/src/main/java/org/purpurmc/purpur/event/packet/NetworkItemSerializeEvent.java
+@@ -0,0 +1,48 @@
++package org.purpurmc.purpur.event.packet;
++
++import org.bukkit.event.Event;
++import org.bukkit.event.HandlerList;
++import org.bukkit.inventory.ItemStack;
++import org.jetbrains.annotations.NotNull;
++import org.jetbrains.annotations.Nullable;
++
++/**
++ * Called when an item is about to be written to a packet.
++ */
++public class NetworkItemSerializeEvent extends Event {
++    private ItemStack itemStack;
++
++    public NetworkItemSerializeEvent(@NotNull ItemStack itemStack) {
++        super(!org.bukkit.Bukkit.isPrimaryThread());
++        this.itemStack = itemStack;
++    }
++
++    /**
++     * @return The item that is about to be serialized. Not mutable
++     */
++    @NotNull
++    public ItemStack getItemStack() {
++        return itemStack;
++    }
++
++    /**
++     * Sets the item that will be serialized.
++     *
++     * @param itemStack The item
++     */
++    public void setItemStack(@Nullable ItemStack itemStack) {
++        this.itemStack = itemStack;
++    }
++
++    private static final HandlerList handlers = new HandlerList();
++
++    @NotNull
++    public HandlerList getHandlers() {
++        return handlers;
++    }
++
++    @NotNull
++    public static HandlerList getHandlerList() {
++        return handlers;
++    }
++}
diff --git a/patches/server/0301-Add-item-packet-serialize-event.patch b/patches/server/0301-Add-item-packet-serialize-event.patch
new file mode 100644
index 000000000..5389319bc
--- /dev/null
+++ b/patches/server/0301-Add-item-packet-serialize-event.patch
@@ -0,0 +1,45 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: MelnCat <melncatuwu@gmail.com>
+Date: Sat, 24 Sep 2022 09:56:28 -0700
+Subject: [PATCH] Add item packet serialize event
+
+
+diff --git a/src/main/java/net/minecraft/network/FriendlyByteBuf.java b/src/main/java/net/minecraft/network/FriendlyByteBuf.java
+index 35377576ed182814051c11f902e02e8e921e84e3..a7b6e22daf64abca311bc5771192a3c09368537f 100644
+--- a/src/main/java/net/minecraft/network/FriendlyByteBuf.java
++++ b/src/main/java/net/minecraft/network/FriendlyByteBuf.java
+@@ -83,6 +83,8 @@ public class FriendlyByteBuf extends ByteBuf {
+     private static final int MAX_PUBLIC_KEY_HEADER_SIZE = 256;
+     private static final int MAX_PUBLIC_KEY_LENGTH = 512;
+ 
++    public static boolean hasItemSerializeEvent = false; // Purpur
++
+     public FriendlyByteBuf(ByteBuf parent) {
+         this.source = parent;
+     }
+@@ -570,6 +572,13 @@ public class FriendlyByteBuf extends ByteBuf {
+             this.writeBoolean(false);
+         } else {
+             this.writeBoolean(true);
++            // Purpur start
++            if (hasItemSerializeEvent) {
++                var event = new org.purpurmc.purpur.event.packet.NetworkItemSerializeEvent(stack.asBukkitCopy());
++                event.callEvent();
++                stack = ItemStack.fromBukkitCopy(event.getItemStack());
++            }
++            // Purpur end
+             Item item = stack.getItem();
+ 
+             this.writeId(Registry.ITEM, item);
+diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
+index 60bed3f87016b29508ea1a94db65a1f60d960de1..13c9cddf7ac0af16676050e3bcdf22b7475a0387 100644
+--- a/src/main/java/net/minecraft/server/MinecraftServer.java
++++ b/src/main/java/net/minecraft/server/MinecraftServer.java
+@@ -1537,6 +1537,7 @@ public abstract class MinecraftServer extends ReentrantBlockableEventLoop<TickTa
+         //MinecraftTimings.timeUpdateTimer.stopTiming(); // Spigot // Paper // Purpur
+ 
+         this.isIteratingOverLevels = true; // Paper
++        net.minecraft.network.FriendlyByteBuf.hasItemSerializeEvent = org.purpurmc.purpur.event.packet.NetworkItemSerializeEvent.getHandlerList().getRegisteredListeners().length > 0; // Purpur
+         Iterator iterator = this.getAllLevels().iterator(); // Paper - move down
+         while (iterator.hasNext()) {
+             ServerLevel worldserver = (ServerLevel) iterator.next();