1 files changed, 57 insertions, 0 deletions
diff --git a/patches/server/0283-Book-Size-Limits.patch b/patches/server/0283-Book-Size-Limits.patch
new file mode 100644
index 0000000000..b9841df559
--- /dev/null
+++ b/patches/server/0283-Book-Size-Limits.patch
@@ -0,0 +1,57 @@
+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/net/minecraft/server/network/ServerGamePacketListenerImpl.java b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+index e01c4b59686d0aa1726d793df0238b8a699e1bf4..efbc8236b148e3a194125d0ccfbd215a8cc8455a 100644
+--- a/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
++++ b/src/main/java/net/minecraft/server/network/ServerGamePacketListenerImpl.java
+@@ -1029,6 +1029,45 @@ public class ServerGamePacketListenerImpl extends ServerCommonPacketListenerImpl
+ 
+     @Override
+     public void handleEditBook(ServerboundEditBookPacket packet) {
++        // Paper start
++        if (!this.cserver.isPrimaryThread()) {
++            List<String> pageList = packet.getPages();
++            long byteTotal = 0;
++            int maxBookPageSize = io.papermc.paper.configuration.GlobalConfiguration.get().itemValidation.bookSize.pageMax;
++            double multiplier = Math.max(0.3D, Math.min(1D, io.papermc.paper.configuration.GlobalConfiguration.get().itemValidation.bookSize.totalMultiplier));
++            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!");