Scissors/patches/server/0028-Reject-oversized-components-from-updating.patch

From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Telesphoreo <me@telesphoreo.me>
Date: Sun, 12 Jun 2022 00:33:21 -0500
Subject: [PATCH] Reject oversized components from updating


diff --git a/src/main/java/net/minecraft/network/chat/ComponentUtils.java b/src/main/java/net/minecraft/network/chat/ComponentUtils.java
index 9d3449dd92bbbef91b627caba752b87d8209011d..26c0438e8d4ef5ccfc53fbd5233bb6b7b0b1fc60 100644
--- a/src/main/java/net/minecraft/network/chat/ComponentUtils.java
+++ b/src/main/java/net/minecraft/network/chat/ComponentUtils.java
@@ -39,8 +39,10 @@ public class ComponentUtils {
     }
 
     public static MutableComponent updateForEntity(@Nullable CommandSourceStack source, Component text, @Nullable Entity sender, int depth) throws CommandSyntaxException {
+        // Scissors start - Reject oversized components
+        MutableComponent result;
         if (depth > 100) {
-            return text.copy();
+            result = text.copy();
         } else {
             MutableComponent mutableComponent = text.getContents().resolve(source, sender, depth + 1);
 
@@ -48,8 +50,11 @@ public class ComponentUtils {
                 mutableComponent.append(updateForEntity(source, component, sender, depth + 1));
             }
 
-            return mutableComponent.withStyle(resolveStyle(source, text.getStyle(), sender, depth));
+            result = mutableComponent.withStyle(resolveStyle(source, text.getStyle(), sender, depth));
         }
+        // Would the resulting component exceed 65535 bytes when encoded as a string?
+        return Component.Serializer.toJson(result).length() > 65535 ? Component.empty() : result;
+        // Scissors end
     }
 
     private static Style resolveStyle(@Nullable CommandSourceStack source, Style style, @Nullable Entity sender, int depth) throws CommandSyntaxException {