1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
|
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/network/protocol/game/ServerboundEditBookPacket.java b/src/main/java/net/minecraft/network/protocol/game/ServerboundEditBookPacket.java
index ed61767a64cdce37dc7c226ebd0d693a60de24a9..f634a830a2b58a419e84f969bd53eeae4f4513bb 100644
--- a/src/main/java/net/minecraft/network/protocol/game/ServerboundEditBookPacket.java
+++ b/src/main/java/net/minecraft/network/protocol/game/ServerboundEditBookPacket.java
@@ -16,9 +16,9 @@ public record ServerboundEditBookPacket(int slot, List<String> pages, Optional<S
public static final StreamCodec<FriendlyByteBuf, ServerboundEditBookPacket> STREAM_CODEC = StreamCodec.composite(
ByteBufCodecs.VAR_INT,
ServerboundEditBookPacket::slot,
- ByteBufCodecs.stringUtf8(8192).apply(ByteBufCodecs.list(200)),
+ ByteBufCodecs.stringUtf8(net.minecraft.world.item.component.WritableBookContent.PAGE_EDIT_LENGTH).apply(ByteBufCodecs.list(net.minecraft.world.item.component.WritableBookContent.MAX_PAGES)), // Paper - limit books
ServerboundEditBookPacket::pages,
- ByteBufCodecs.stringUtf8(128).apply(ByteBufCodecs::optional),
+ ByteBufCodecs.stringUtf8(net.minecraft.world.item.component.WrittenBookContent.TITLE_MAX_LENGTH).apply(ByteBufCodecs::optional), // Paper - limit books
ServerboundEditBookPacket::title,
ServerboundEditBookPacket::new
);
diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
index ce06a41d98bafc878918507404bd5d6cabc45776..aff0f55623365130f079818af9d6a2e448cfe342 100644
--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
@@ -1043,6 +1043,43 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
@Override
public void handleEditBook(ServerboundEditBookPacket packet) {
+ // Paper start - Book size limits
+ if (!this.cserver.isPrimaryThread()) {
+ final List<String> pageList = packet.pages();
+ long byteTotal = 0;
+ final int maxBookPageSize = io.papermc.paper.configuration.GlobalConfiguration.get().itemValidation.bookSize.pageMax;
+ final double multiplier = Math.clamp(io.papermc.paper.configuration.GlobalConfiguration.get().itemValidation.bookSize.totalMultiplier, 0.3D, 1D);
+ long byteAllowed = maxBookPageSize;
+ for (final String page : pageList) {
+ final int byteLength = page.getBytes(java.nio.charset.StandardCharsets.UTF_8).length;
+ byteTotal += byteLength;
+ final int length = page.length();
+ int multiByteCharacters = 0;
+ if (byteLength != length) {
+ // Count the number of multi byte characters
+ for (final char c : page.toCharArray()) {
+ if (c > 127) {
+ multiByteCharacters++;
+ }
+ }
+ }
+
+ // Allow pages with fewer characters to consume less of the allowed byte quota
+ byteAllowed += maxBookPageSize * Math.clamp((double) length / 255D, 0.1D, 1) * multiplier;
+
+ if (multiByteCharacters > 1) {
+ // Penalize multibyte characters
+ byteAllowed -= multiByteCharacters;
+ }
+ }
+
+ 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!"));
|
