Add option to truncate edited books with more than 50 pages

bukkit/src/main/java/us/myles/ViaVersion/bukkit/platform/BukkitViaConfig.java

@@ -249,4 +249,9 @@ public class BukkitViaConfig extends Config implements ViaVersionConfig {
     public int get1_13TabCompleteDelay() {
         return getInt("1_13-tab-complete-delay", 0);
     }
+
+    @Override
+    public boolean truncate1_14Books() {
+        return getBoolean("truncate-1_14-books", false);
+    }
 }

bungee/src/main/java/us/myles/ViaVersion/bungee/platform/BungeeViaConfig.java

@@ -302,4 +302,9 @@ public class BungeeViaConfig extends Config implements ViaVersionConfig {
     public int get1_13TabCompleteDelay() {
         return getInt("1_13-tab-complete-delay", 0);
     }
+
+    @Override
+    public boolean truncate1_14Books() {
+        return getBoolean("truncate-1_14-books", false);
+    }
 }

common/src/main/java/us/myles/ViaVersion/api/ViaVersionConfig.java

@@ -305,7 +305,15 @@ public interface ViaVersionConfig {
 
     /**
      * When greater than 0, enables tab complete request delaying by x ticks
+     *
      * @return the delay in ticks
      */
     int get1_13TabCompleteDelay();
+
+    /**
+     * When activated, edited books with more than 50 pages will be shortened to 50.
+     *
+     * @return True if enabled
+     */
+    boolean truncate1_14Books();
 }

common/src/main/java/us/myles/ViaVersion/protocols/protocol1_14to1_13_2/packets/PlayerPackets.java

@@ -1,7 +1,12 @@
 package us.myles.ViaVersion.protocols.protocol1_14to1_13_2.packets;
 
+import com.github.steveice10.opennbt.tag.builtin.CompoundTag;
+import com.github.steveice10.opennbt.tag.builtin.ListTag;
+import com.github.steveice10.opennbt.tag.builtin.Tag;
 import us.myles.ViaVersion.api.PacketWrapper;
+import us.myles.ViaVersion.api.Via;
 import us.myles.ViaVersion.api.minecraft.Position;
+import us.myles.ViaVersion.api.minecraft.item.Item;
 import us.myles.ViaVersion.api.protocol.Protocol;
 import us.myles.ViaVersion.api.remapper.PacketHandler;
 import us.myles.ViaVersion.api.remapper.PacketRemapper;
@@ -36,7 +41,23 @@ public class PlayerPackets {
                 handler(new PacketHandler() {
                     @Override
                     public void handle(PacketWrapper wrapper) throws Exception {
-                        InventoryPackets.toServer(wrapper.passthrough(Type.FLAT_VAR_INT_ITEM));
+                        final Item item = wrapper.passthrough(Type.FLAT_VAR_INT_ITEM);
+                        InventoryPackets.toServer(item);
+
+                        // Client limit when editing a book was upped from 50 to 100 in 1.14, but some anti-exploit plugins ban with a size higher than the old client limit
+                        if (Via.getConfig().truncate1_14Books()) {
+                            if (item == null) return;
+                            CompoundTag tag = item.getTag();
+
+                            if (tag == null) return;
+                            Tag pages = tag.get("pages");
+
+                            if (!(pages instanceof ListTag)) return;
+
+                            ListTag listTag = (ListTag) pages;
+                            if (listTag.size() <= 50) return;
+                            listTag.setValue(listTag.getValue().subList(0, 50));
+                        }
                     }
                 });
             }

common/src/main/resources/assets/viaversion/config.yml

@@ -118,6 +118,8 @@ disable-1_13-auto-complete: false
 1_13-tab-complete-delay: 0
 # For 1.13 clients the smallest (1 layer) snow doesn't have collision, this will send these as 2 snowlayers for 1.13+ clients to prevent them bugging through them
 fix-low-snow-collision: false
+# In 1.14 the client page limit has been upped to 100 (from 50). Some anti-exploit plugins ban when clients go higher than 50. This option cuts edited books to 50 pages.
+truncate-1_14-books: false
 #
 # Enable serverside block-connections for 1.13+ clients
 serverside-blockconnections: false

sponge/src/main/java/us/myles/ViaVersion/sponge/platform/SpongeViaConfig.java

@@ -255,4 +255,9 @@ public class SpongeViaConfig extends Config implements ViaVersionConfig {
     public int get1_13TabCompleteDelay() {
         return getInt("1_13-tab-complete-delay", 0);
     }
+
+    @Override
+    public boolean truncate1_14Books() {
+        return getBoolean("truncate-1_14-books", false);
+    }
 }

velocity/src/main/java/us/myles/ViaVersion/velocity/platform/VelocityViaConfig.java

@@ -307,4 +307,9 @@ public class VelocityViaConfig extends Config implements ViaVersionConfig {
     public int get1_13TabCompleteDelay() {
         return getInt("1_13-tab-complete-delay", 0);
     }
+
+    @Override
+    public boolean truncate1_14Books() {
+        return getBoolean("truncate-1_14-books", false);
+    }
 }