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From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
From: Aikar <aikar@aikar.co>
Date: Fri, 16 Nov 2018 23:08:50 -0500
Subject: [PATCH] Book size limits
Puts some limits on the size of books.
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index 2e35c6cfdf0cded5adc9f512612faaa68876961c..d69b678b2611f3d1b1ef64541863256868969671 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1043,6 +1043,40 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
@Override
public void handleEditBook(ServerboundEditBookPacket packet) {
+ // Paper start - Book size limits
+ if (!this.cserver.isPrimaryThread()) {
+ List<String> pageList = packet.pages();
+ long byteTotal = 0;
+ int maxBookPageSize = io.papermc.paper.configuration.GlobalConfiguration.get().itemValidation.bookSize.pageMax;
+ double multiplier = Math.clamp(io.papermc.paper.configuration.GlobalConfiguration.get().itemValidation.bookSize.totalMultiplier, 0.3D, 1D);
+ long byteAllowed = maxBookPageSize;
+ for (String testString : pageList) {
+ int byteLength = testString.getBytes(java.nio.charset.StandardCharsets.UTF_8).length;
+ byteTotal += byteLength;
+ int length = testString.length();
+ int multibytes = 0;
+ if (byteLength != length) {
+ for (char c : testString.toCharArray()) {
+ if (c > 127) {
+ multibytes++;
+ }
+ }
+ }
+ byteAllowed += maxBookPageSize * Math.clamp((double) length / 255D, 0.1D, 1) * multiplier;
+
+ if (multibytes > 1) {
+ // penalize MB
+ byteAllowed -= multibytes;
+ }
+ }
+
+ if (byteTotal > byteAllowed) {
+ ServerGamePacketListenerImpl.LOGGER.warn("{} tried to send a book too large. Book size: {} - Allowed: {} - Pages: {}", this.player.getScoreboardName(), byteTotal, byteAllowed, pageList.size());
+ this.disconnect(Component.literal("Book too large!"));
+ return;
+ }
+ }
+ // Paper end - Book size limits
// CraftBukkit start
if (this.lastBookTick + 20 > MinecraftServer.currentTick) {
this.disconnect(Component.literal("Book edited too quickly!"));
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