From e745ff4721601dbe8075e05aec4c3ddc07ddfdf2 Mon Sep 17 00:00:00 2001
From: =?UTF-8?q?Elias=20M=C3=BCller?= <elias@elias-mueller.com>
Date: Mon, 27 Oct 2025 17:10:44 +0100
Subject: [PATCH] added AntiFormattedBook to detect and sanitize illegal book
 formatting

---
 .../antiFormattedBook/AntiFormattedBook.java  | 66 +++++++++++++++++++
 .../antiFormattedBook/BookEditListener.java   | 36 ++++++++++
 2 files changed, 102 insertions(+)
 create mode 100644 common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/AntiFormattedBook.java
 create mode 100644 common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/BookEditListener.java

diff --git a/common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/AntiFormattedBook.java b/common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/AntiFormattedBook.java
new file mode 100644
index 0000000..6af6d80
--- /dev/null
+++ b/common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/AntiFormattedBook.java
@@ -0,0 +1,66 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiFormattedBook;
+
+import eu.mhsl.craftattack.spawn.core.appliance.Appliance;
+import net.kyori.adventure.text.*;
+import net.kyori.adventure.text.format.Style;
+import net.kyori.adventure.text.format.TextColor;
+import net.kyori.adventure.text.format.TextDecoration;
+import org.bukkit.event.Listener;
+import org.bukkit.inventory.meta.BookMeta;
+import org.jetbrains.annotations.NotNull;
+import org.jetbrains.annotations.Nullable;
+
+import java.util.List;
+import java.util.Objects;
+
+public class AntiFormattedBook extends Appliance {
+    private static final char SECTION = '\u00A7';
+
+    public boolean containsFormatting(BookMeta meta) {
+        if (this.hasFormattingDeep(meta.title())) return true;
+        if (this.hasFormattingDeep(meta.author())) return true;
+
+        for (Component c : meta.pages()) {
+            if (this.hasFormattingDeep(c)) return true;
+        }
+        return false;
+    }
+
+    private boolean hasFormattingDeep(@Nullable Component component) {
+        if(component == null) return false;
+        if (this.hastFormatting(component)) return true;
+
+        if (component instanceof TextComponent tc && tc.content().indexOf(SECTION) >= 0) return true;
+
+        if (component instanceof NBTComponent<?, ?> nbt) {
+            if (nbt.separator() != null && this.hasFormattingDeep(nbt.separator())) return true;
+        }
+
+        for (Component child : component.children()) {
+            if (this.hasFormattingDeep(child)) return true;
+        }
+        return false;
+    }
+
+    private boolean hastFormatting(Component component) {
+        Style style = component.style();
+
+        TextColor color = style.color();
+        if (color != null) return true;
+        if (style.font() != null) return true;
+        if (style.insertion() != null && !Objects.requireNonNull(style.insertion()).isEmpty()) return true;
+
+        for (var decoration : style.decorations().entrySet()) {
+            if (decoration.getValue() == TextDecoration.State.TRUE) return true;
+        }
+
+        return style.hoverEvent() != null || style.clickEvent() != null;
+    }
+
+    @Override
+    protected @NotNull List<Listener> listeners() {
+        return List.of(
+            new BookEditListener()
+        );
+    }
+}
diff --git a/common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/BookEditListener.java b/common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/BookEditListener.java
new file mode 100644
index 0000000..1fcf3c9
--- /dev/null
+++ b/common/src/main/java/eu/mhsl/craftattack/spawn/common/appliances/security/antiFormattedBook/BookEditListener.java
@@ -0,0 +1,36 @@
+package eu.mhsl.craftattack.spawn.common.appliances.security.antiFormattedBook;
+
+import eu.mhsl.craftattack.spawn.common.appliances.tooling.acInform.AcInform;
+import eu.mhsl.craftattack.spawn.core.Main;
+import eu.mhsl.craftattack.spawn.core.appliance.ApplianceListener;
+import net.kyori.adventure.text.Component;
+import org.bukkit.entity.Player;
+import org.bukkit.event.EventHandler;
+import org.bukkit.event.player.PlayerEditBookEvent;
+import org.bukkit.inventory.meta.BookMeta;
+
+import java.util.List;
+
+class BookEditListener extends ApplianceListener<AntiFormattedBook> {
+    @EventHandler
+    public void onBookEdit(PlayerEditBookEvent event) {
+        Player player = event.getPlayer();
+        BookMeta meta = event.getNewBookMeta();
+
+        if (this.getAppliance().containsFormatting(meta)) {
+            Main.instance().getAppliance(AcInform.class).notifyAdmins(
+                "internal",
+                player.getName(),
+                "illegalBookFormatting",
+                1f
+            );
+
+            BookMeta sanitized = meta.clone();
+            sanitized.title(null);
+            sanitized.author(null);
+            //noinspection ResultOfMethodCallIgnored
+            sanitized.pages(List.of(Component.empty()));
+            event.setNewBookMeta(sanitized);
+        }
+    }
+}