From edbdefb7bdea8934d8f726cd2493c4311a60a9ca Mon Sep 17 00:00:00 2001
From: xGinko <rachel.audrey@mail.de>
Date: Tue, 10 Sep 2024 23:08:49 +0200
Subject: [PATCH] add 1.20.6-1.21 bookdupe prevention

---
 .../dupepreventions/BookTitleDupe.java        | 41 +++++++++++++++++++
 .../dupepreventions/BookTitleDupe.java        | 41 +++++++++++++++++++
 2 files changed, 82 insertions(+)
 create mode 100755 AnarchyExploitFixesFolia/src/main/java/me/xginko/aef/modules/dupepreventions/BookTitleDupe.java
 create mode 100755 AnarchyExploitFixesLegacy/src/main/java/me/xginko/aef/modules/dupepreventions/BookTitleDupe.java

diff --git a/AnarchyExploitFixesFolia/src/main/java/me/xginko/aef/modules/dupepreventions/BookTitleDupe.java b/AnarchyExploitFixesFolia/src/main/java/me/xginko/aef/modules/dupepreventions/BookTitleDupe.java
new file mode 100755
index 00000000..8dfbc52a
--- /dev/null
+++ b/AnarchyExploitFixesFolia/src/main/java/me/xginko/aef/modules/dupepreventions/BookTitleDupe.java
@@ -0,0 +1,41 @@
+package me.xginko.aef.modules.dupepreventions;
+
+import com.github.retrooper.packetevents.event.PacketListenerPriority;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientEditBook;
+import me.xginko.aef.modules.packets.PacketModule;
+import me.xginko.aef.utils.PlatformUtil;
+
+public class BookTitleDupe extends PacketModule {
+
+    private final int maxTitleChars;
+
+    public BookTitleDupe() {
+        super("dupe-preventions.book-title-dupe", PacketListenerPriority.HIGHEST);
+        config.addComment(configPath + ".enable", """
+                Relevant for 1.20.6 - 1.21:
+                Will prevent players from sending book packets with a too large title,
+                to get disconnected and their inventories restored.""");
+        this.maxTitleChars = config.getInt(configPath + ".max-title-charlength", 20, """
+                Normal ascii like charlimit in vanilla is 15, you could need a bit more
+                if you want to support languages with special characters.""");
+    }
+
+    @Override
+    public boolean shouldEnable() {
+        return config.getBoolean(configPath + ".enable", PlatformUtil.getMinecraftPatchVersion() > 19);
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() != PacketType.Play.Client.EDIT_BOOK) return;
+
+        WrapperPlayClientEditBook packet = new WrapperPlayClientEditBook(event);
+        if (packet.getTitle() == null) return;
+
+        if (packet.getTitle().length() > maxTitleChars) {
+            event.setCancelled(true);
+        }
+    }
+}
diff --git a/AnarchyExploitFixesLegacy/src/main/java/me/xginko/aef/modules/dupepreventions/BookTitleDupe.java b/AnarchyExploitFixesLegacy/src/main/java/me/xginko/aef/modules/dupepreventions/BookTitleDupe.java
new file mode 100755
index 00000000..2bfd90ac
--- /dev/null
+++ b/AnarchyExploitFixesLegacy/src/main/java/me/xginko/aef/modules/dupepreventions/BookTitleDupe.java
@@ -0,0 +1,41 @@
+package me.xginko.aef.modules.dupepreventions;
+
+import com.github.retrooper.packetevents.event.PacketListenerPriority;
+import com.github.retrooper.packetevents.event.PacketReceiveEvent;
+import com.github.retrooper.packetevents.protocol.packettype.PacketType;
+import com.github.retrooper.packetevents.wrapper.play.client.WrapperPlayClientEditBook;
+import me.xginko.aef.modules.packets.PacketModule;
+import me.xginko.aef.utils.PlatformUtil;
+
+public class BookTitleDupe extends PacketModule {
+
+    private final int maxTitleChars;
+
+    public BookTitleDupe() {
+        super("dupe-preventions.book-title-dupe", PacketListenerPriority.HIGHEST);
+        config.addComment(configPath + ".enable",
+                "Relevant for 1.20.6 - 1.21:\n" +
+                "Will prevent players from sending book packets with a too large title,\n" +
+                "to get disconnected and their inventories restored.");
+        this.maxTitleChars = config.getInt(configPath + ".max-title-charlength", 20,
+                "Normal ascii like charlimit in vanilla is 15, you could need a bit more\n" +
+                "if you want to support languages with special characters.");
+    }
+
+    @Override
+    public boolean shouldEnable() {
+        return config.getBoolean(configPath + ".enable", PlatformUtil.getMinecraftPatchVersion() > 19);
+    }
+
+    @Override
+    public void onPacketReceive(PacketReceiveEvent event) {
+        if (event.getPacketType() != PacketType.Play.Client.EDIT_BOOK) return;
+
+        WrapperPlayClientEditBook packet = new WrapperPlayClientEditBook(event);
+        if (packet.getTitle() == null) return;
+
+        if (packet.getTitle().length() > maxTitleChars) {
+            event.setCancelled(true);
+        }
+    }
+}