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 9938bb90bef84cf784f9a1ceb02a1a45aa8b48a1..1f4b64a5f812376c499c98cb4be62469bd0b7dbe 100644
--- a/src/main/java/net/minecraft/network/FriendlyByteBuf.java
+++ b/src/main/java/net/minecraft/network/FriendlyByteBuf.java
@@ -98,6 +98,8 @@ public class FriendlyByteBuf extends ByteBuf {
     private static final int MAX_PUBLIC_KEY_LENGTH = 512;
     private static final Gson GSON = new Gson();
 
+    public static boolean hasItemSerializeEvent = false; // Purpur
+
     public FriendlyByteBuf(ByteBuf parent) {
         this.source = parent;
     }
@@ -679,6 +681,17 @@ 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();
+                ItemStack newStack = ItemStack.fromBukkitCopy(event.getItemStack());
+                if (org.purpurmc.purpur.PurpurConfig.fixNetworkSerializedItemsInCreative && !ItemStack.matches(stack, newStack)) {
+                    stack.save(newStack.getOrCreateTagElement("Purpur.OriginalItem"));
+                }
+                stack = newStack;
+            }
+            // Purpur end
             Item item = stack.getItem();
 
             this.writeId(BuiltInRegistries.ITEM, item);
diff --git a/src/main/java/net/minecraft/server/MinecraftServer.java b/src/main/java/net/minecraft/server/MinecraftServer.java
index 5fbf050a5f6a6c59089cb67e880f02f99844e384..7c09843aafb4f744ecd0f36d6a0abc253fb5322d 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1545,6 +1545,7 @@ 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();
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 924c08489582444ae7b061c52eac91759c8f4484..e76eaa121f73cc56b0e3445eb976546daef87f99 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -3457,6 +3457,12 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Tic
                     }
                 }
             }
+            // Purpur start
+            if (org.purpurmc.purpur.PurpurConfig.fixNetworkSerializedItemsInCreative) {
+                var tag = itemstack.getTagElement("Purpur.OriginalItem");
+                if (tag != null) itemstack = ItemStack.of(tag);
+            }
+            // Purpur end
 
             boolean flag1 = packet.getSlotNum() >= 1 && packet.getSlotNum() <= 45;
             boolean flag2 = itemstack.isEmpty() || itemstack.getDamageValue() >= 0 && itemstack.getCount() <= 64 && !itemstack.isEmpty();
diff --git a/src/main/java/org/purpurmc/purpur/PurpurConfig.java b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
index 4142820c3053d77d4ae7186fec968d624f893056..7a02cecaaef511c0db4708a1ce9eb885c1cfe028 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
@@ -549,4 +549,9 @@ public class PurpurConfig {
             }
         });
     }
+
+    public static boolean fixNetworkSerializedItemsInCreative = false;
+    private static void fixNetworkSerializedCreativeItems() {
+        fixNetworkSerializedItemsInCreative = getBoolean("settings.fix-network-serialized-items-in-creative", fixNetworkSerializedItemsInCreative);
+    }
 }