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 ff794499df6a2b65db2ca5956d2b98317592057f..fcfb7eb9b093896f11be4c13d450c522b3c47b15 100644
--- a/src/main/java/net/minecraft/network/FriendlyByteBuf.java
+++ b/src/main/java/net/minecraft/network/FriendlyByteBuf.java
@@ -95,6 +95,8 @@ 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;
     }
@@ -632,6 +634,17 @@ 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 e764ad7096852d8905422e8d0f140ed16c5b4498..39ecb12d4296852ee5865dcfa2b8b6c3233a4804 100644
--- a/src/main/java/net/minecraft/server/MinecraftServer.java
+++ b/src/main/java/net/minecraft/server/MinecraftServer.java
@@ -1716,6 +1716,7 @@ 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 22020b5746988cf30385cc075c8e0b1309c99d69..6c5f5c19048ec52c088044f2bc34f54b937b1912 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -3372,6 +3372,12 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
                     }
                 }
             }
+            // 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 568bb53e91dda4804cd328a81ba12ce735c52603..62aabfc021fa3349b0ab46744a9ec78d57f058b0 100644
--- a/src/main/java/org/purpurmc/purpur/PurpurConfig.java
+++ b/src/main/java/org/purpurmc/purpur/PurpurConfig.java
@@ -563,4 +563,9 @@ public class PurpurConfig {
             }
         });
     }
+
+    public static boolean fixNetworkSerializedItemsInCreative = false;
+    private static void fixNetworkSerializedCreativeItems() {
+        fixNetworkSerializedItemsInCreative = getBoolean("settings.fix-network-serialized-items-in-creative", fixNetworkSerializedItemsInCreative);
+    }
 }