1 files changed, 75 insertions, 0 deletions
diff --git a/patches/server/0291-Book-Size-Limits.patch b/patches/server/0291-Book-Size-Limits.patch
new file mode 100644
index 0000000000..94aa39a5b0
--- /dev/null
+++ b/patches/server/0291-Book-Size-Limits.patch
@@ -0,0 +1,75 @@
+From 0000000000000000000000000000000000000000 Mon Sep 17 00:00:00 2001
+From: Aikar <[email protected]>
+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/com/destroystokyo/paper/PaperConfig.java b/src/main/java/com/destroystokyo/paper/PaperConfig.java
+index 36719c689a24c63e7d9a5b40f8c262c182a31b21..83bf428abd3be89e34cf42638bd1357a708ea0e3 100644
+--- a/src/main/java/com/destroystokyo/paper/PaperConfig.java
++++ b/src/main/java/com/destroystokyo/paper/PaperConfig.java
+@@ -369,6 +369,13 @@ public class PaperConfig {
+         }
+     }
+ 
++    public static int maxBookPageSize = 2560;
++    public static double maxBookTotalSizeMultiplier = 0.98D;
++    private static void maxBookSize() {
++        maxBookPageSize = Math.min(8192, getInt("settings.book-size.page-max", maxBookPageSize));
++        maxBookTotalSizeMultiplier = getDouble("settings.book-size.total-multiplier", maxBookTotalSizeMultiplier);
++    }
++
+     public static boolean asyncChunks = false;
+     private static void asyncChunks() {
+         ConfigurationSection section;
+diff --git a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index 7241418074dbd8e0e81e2b679bd317d98fea2e27..d8135a0e644b67ed47972eb3bda517323561a93d 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -1012,6 +1012,45 @@ public class ServerGamePacketListenerImpl implements ServerPlayerConnection, Ser
+ 
+     @Override
+     public void handleEditBook(ServerboundEditBookPacket packet) {
++        // Paper start
++        if (!this.cserver.isPrimaryThread()) {
++            List<String> pageList = packet.getPages();
++            long byteTotal = 0;
++            int maxBookPageSize = com.destroystokyo.paper.PaperConfig.maxBookPageSize;
++            double multiplier = Math.max(0.3D, Math.min(1D, com.destroystokyo.paper.PaperConfig.maxBookTotalSizeMultiplier));
++            long byteAllowed = maxBookPageSize;
++            for (String testString : pageList) {
++                int byteLength = testString.getBytes(java.nio.charset.StandardCharsets.UTF_8).length;
++                if (byteLength > 256 * 4) {
++                    ServerGamePacketListenerImpl.LOGGER.warn(this.player.getScoreboardName() + " tried to send a book with with a page too large!");
++                    server.scheduleOnMain(() -> this.disconnect("Book too large!"));
++                    return;
++                }
++                byteTotal += byteLength;
++                int length = testString.length();
++                int multibytes = 0;
++                if (byteLength != length) {
++                    for (char c : testString.toCharArray()) {
++                        if (c > 127) {
++                            multibytes++;
++                        }
++                    }
++                }
++                byteAllowed += (maxBookPageSize * Math.min(1, Math.max(0.1D, (double) length / 255D))) * multiplier;
++
++                if (multibytes > 1) {
++                    // penalize MB
++                    byteAllowed -= multibytes;
++                }
++            }
++
++            if (byteTotal > byteAllowed) {
++                ServerGamePacketListenerImpl.LOGGER.warn(this.player.getScoreboardName() + " tried to send too large of a book. Book Size: " + byteTotal + " - Allowed:  "+ byteAllowed + " - Pages: " + pageList.size());
++                server.scheduleOnMain(() -> this.disconnect("Book too large!"));
++                return;
++            }
++        }
++        // Paper end
+         // CraftBukkit start
+         if (this.lastBookTick + 20 > MinecraftServer.currentTick) {
+             this.disconnect("Book edited too quickly!");