feat(network): 实现阻止玩家在游戏内直接使用自定义默认字体

2025-12-20 07:29:17 +00:00 · 2025-03-23 00:28:52 +08:00
parent 332642d529
commit c09b987733
5 changed files with 142 additions and 30 deletions
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/BukkitNetworkManager.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/BukkitNetworkManager.java
@@ -127,6 +127,7 @@ public class BukkitNetworkManager implements NetworkManager, Listener {
        registerNMSPacketConsumer(PacketConsumers.SOUND, Reflections.clazz$ClientboundSoundPacket);
        registerNMSPacketConsumer(PacketConsumers.CHAT, Reflections.clazz$ServerboundChatPacket);
        registerNMSPacketConsumer(PacketConsumers.RENAME_ITEM, Reflections.clazz$ServerboundRenameItemPacket);
+        registerNMSPacketConsumer(PacketConsumers.SIGN_UPDATE, Reflections.clazz$ServerboundSignUpdatePacket);
        registerByteBufPacketConsumer(PacketConsumers.SECTION_BLOCK_UPDATE, this.packetIds.clientboundSectionBlocksUpdatePacket());
        registerByteBufPacketConsumer(PacketConsumers.BLOCK_UPDATE, this.packetIds.clientboundBlockUpdatePacket());
        registerByteBufPacketConsumer(PacketConsumers.LEVEL_PARTICLE, this.packetIds.clientboundLevelParticlesPacket());
@@ -267,6 +268,20 @@ public class BukkitNetworkManager implements NetworkManager, Listener {
        this.packetsConsumer.accept(player.serverPlayer(), packet);
    }

+    public void receivePacket(@NotNull NetWorkUser player, Object packet) {
+        Channel channel = player.nettyChannel();
+        List<String> handlerNames = channel.pipeline().names();
+        if (handlerNames.contains("decompress")) {
+            channel.pipeline().context("decompress").fireChannelRead(packet);
+        } else {
+            if (handlerNames.contains("decrypt")) {
+                channel.pipeline().context("decrypt").fireChannelRead(packet);
+            } else {
+                channel.pipeline().context("splitter").fireChannelRead(packet);
+            }
+        }
+    }
+
    private void injectServerChannel(Channel serverChannel) {
        ChannelPipeline pipeline = serverChannel.pipeline();
        ChannelHandler connectionHandler = pipeline.get(CONNECTION_HANDLER_NAME);
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/network/PacketConsumers.java
@@ -3,6 +3,8 @@ package net.momirealms.craftengine.bukkit.plugin.network;
 import io.netty.buffer.ByteBuf;
 import io.netty.buffer.Unpooled;
 import it.unimi.dsi.fastutil.ints.IntList;
+import net.kyori.adventure.text.Component;
+import net.kyori.adventure.text.minimessage.MiniMessage;
 import net.momirealms.craftengine.bukkit.api.CraftEngineFurniture;
 import net.momirealms.craftengine.bukkit.api.event.FurnitureBreakEvent;
 import net.momirealms.craftengine.bukkit.api.event.FurnitureInteractEvent;
@@ -33,9 +35,8 @@ import org.bukkit.util.RayTraceResult;

 import java.lang.reflect.InvocationTargetException;
 import java.lang.reflect.Method;
-import java.util.Arrays;
-import java.util.Map;
-import java.util.Objects;
+import java.time.Instant;
+import java.util.*;
 import java.util.function.BiConsumer;

 public class PacketConsumers {
@@ -670,17 +671,19 @@ public class PacketConsumers {
            if (message != null && !message.isEmpty()) {
                ImageManager manager = CraftEngine.instance().imageManager();
                if (!manager.isDefaultFontInUse()) return;
-                char[] chars = message.toCharArray();
                try {
-                    int[] codepoints = CharacterUtils.charsToCodePoints(chars);
-                    for (int codepoint : codepoints) {
-                        if (manager.isIllegalCharacter(codepoint)) {
-                            event.setCancelled(true);
-                            return;
-                        }
-                    }
-                } catch (Exception ignore) {
-                }
+                    String str = replaceIllegalString(message, manager);
+                    if (message.equals(str)) return;
+                    event.setCancelled(true);
+                    Object newPacket = Reflections.constructor$ServerboundChatPacket.newInstance(
+                            str,
+                            Reflections.field$ServerboundChatPacket$timeStamp.get(packet),
+                            Reflections.field$ServerboundChatPacket$salt.get(packet),
+                            Reflections.field$ServerboundChatPacket$signature.get(packet),
+                            Reflections.field$ServerboundChatPacket$lastSeenMessages.get(packet)
+                    );
+                    user.receivePacket(newPacket);
+                } catch (Exception ignore) {}
            }
        } catch (Exception e) {
            CraftEngine.instance().logger().warn("Failed to handle ServerboundChatPacket", e);
@@ -694,25 +697,49 @@ public class PacketConsumers {
            if (message != null && !message.isEmpty()) {
                ImageManager manager = CraftEngine.instance().imageManager();
                if (!manager.isDefaultFontInUse()) return;
-                char[] chars = message.toCharArray();
                try {
-                    int[] codepoints = CharacterUtils.charsToCodePoints(chars);
-                    int[] newCodepoints = new int[codepoints.length];
-                    for (int i = 0; i < codepoints.length; i++) {
-                        int codepoint = codepoints[i];
-                        if (!manager.isIllegalCharacter(codepoint)) {
-                            newCodepoints[i] = codepoint;
-                        } else {
-                            newCodepoints[i] = '*';
-                        }
-                    }
-                    String str = new String(newCodepoints, 0, newCodepoints.length);
+                    String str = replaceIllegalString(message, manager);
                    Reflections.field$ServerboundRenameItemPacket$name.set(packet, str);
-                } catch (Exception ignore) {
-                }
+                } catch (Exception ignore) {}
            }
        } catch (Exception e) {
            CraftEngine.instance().logger().warn("Failed to handle ServerboundRenameItemPacket", e);
        }
    };
+
+    // we handle it on packet level to prevent it from being captured by plugins
+    public static final TriConsumer<NetWorkUser, NMSPacketEvent, Object> SIGN_UPDATE = (user, event, packet) -> {
+        try {
+            String[] lines = (String[]) Reflections.field$ServerboundSignUpdatePacket$lines.get(packet);
+            ImageManager manager = CraftEngine.instance().imageManager();
+            for (int i = 0; i < lines.length; i++) {
+                String line = lines[i];
+                if (line != null && !line.isEmpty()) {
+                    if (!manager.isDefaultFontInUse()) return;
+                    try {
+                        String str = replaceIllegalString(line, manager);
+                        if (line.equals(str)) continue;
+                        lines[i] = str;
+                    } catch (Exception ignore){}
+                }
+            }
+        } catch (Exception e) {
+            CraftEngine.instance().logger().warn("Failed to handle ServerboundSignUpdatePacket", e);
+        }
+    };
+
+    private static String replaceIllegalString(String string, ImageManager manager) {
+        char[] chars = string.toCharArray();
+        int[] codepoints = CharacterUtils.charsToCodePoints(chars);
+        int[] newCodepoints = new int[codepoints.length];
+        for (int i = 0; i < codepoints.length; i++) {
+            int codepoint = codepoints[i];
+            if (!manager.isIllegalCharacter(codepoint)) {
+                newCodepoints[i] = codepoint;
+            } else {
+                newCodepoints[i] = '*';
+            }
+        }
+        return new String(newCodepoints, 0, newCodepoints.length);
+    }
 }
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/user/BukkitServerPlayer.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/plugin/user/BukkitServerPlayer.java
@@ -231,6 +231,11 @@ public class BukkitServerPlayer extends Player {
        this.plugin.networkManager().sendPacket(this, packet, immediately);
    }

+    @Override
+    public void receivePacket(Object packet) {
+        this.plugin.networkManager().receivePacket(this, packet);
+    }
+
    @Override
    public ConnectionState decoderState() {
        return decoderState;
--- a/bukkit/src/main/java/net/momirealms/craftengine/bukkit/util/Reflections.java
+++ b/bukkit/src/main/java/net/momirealms/craftengine/bukkit/util/Reflections.java
@@ -7,6 +7,7 @@ import io.netty.channel.ChannelFuture;
 import io.netty.channel.ChannelHandlerContext;
 import io.netty.handler.codec.ByteToMessageDecoder;
 import io.netty.handler.codec.MessageToByteEncoder;
+import net.kyori.adventure.text.Component;
 import net.momirealms.craftengine.core.util.ReflectionUtils;
 import net.momirealms.craftengine.core.util.VersionHelper;
 import org.bukkit.Location;
@@ -26,6 +27,7 @@ import sun.misc.Unsafe;

 import java.io.BufferedReader;
 import java.lang.reflect.*;
+import java.time.Instant;
 import java.util.*;
 import java.util.concurrent.CompletableFuture;
 import java.util.concurrent.atomic.AtomicInteger;
@@ -134,9 +136,9 @@ public class Reflections {
    );

    public static final Constructor<?> constructor$ClientboundSystemChatPacket = requireNonNull(
-            ReflectionUtils.getConstructor(
-                    clazz$ClientboundSystemChatPacket, clazz$Component, boolean.class
-            )
+            VersionHelper.isVersionNewerThan1_20_4()
+                    ? ReflectionUtils.getConstructor(clazz$ClientboundSystemChatPacket, clazz$Component, boolean.class)
+                    : ReflectionUtils.getConstructor(clazz$ClientboundSystemChatPacket, Component.class, String.class, boolean.class)
    );

    public static final Field field$ClientboundSystemChatPacket$overlay = requireNonNull(
@@ -189,6 +191,11 @@ public class Reflections {
                    clazz$ClientboundSystemChatPacket, clazz$Component, 0
            );

+    public static final Field field$ClientboundSystemChatPacket$adventure$content =
+            ReflectionUtils.getDeclaredField(
+                    clazz$ClientboundSystemChatPacket, Component.class, 0
+            );
+
    public static final Field field$ClientboundSystemChatPacket$text =
            ReflectionUtils.getDeclaredField(
                    clazz$ClientboundSystemChatPacket, String.class, 0
@@ -5115,6 +5122,19 @@ public class Reflections {
            )
    );

+    public static final Class<?> clazz$MessageSignature = requireNonNull(
+            ReflectionUtils.getClazz(
+                    BukkitReflectionUtils.assembleMCClass("network.chat.MessageSignature")
+            )
+    );
+
+    public static final Class<?> clazz$LastSeenMessages$Update = requireNonNull(
+            ReflectionUtils.getClazz(
+                    BukkitReflectionUtils.assembleMCClass("network.chat.LastSeenMessages$Update"),
+                    BukkitReflectionUtils.assembleMCClass("network.chat.LastSeenMessages$b")
+            )
+    );
+
    public static final Class<?> clazz$ServerboundChatPacket = requireNonNull(
            ReflectionUtils.getClazz(
                    BukkitReflectionUtils.assembleMCClass("network.protocol.game.ServerboundChatPacket"),
@@ -5122,12 +5142,42 @@ public class Reflections {
            )
    );

+    public static final Constructor<?> constructor$ServerboundChatPacket = requireNonNull(
+            ReflectionUtils.getConstructor(
+                    clazz$ServerboundChatPacket, String.class, Instant.class, long.class, clazz$MessageSignature, clazz$LastSeenMessages$Update
+            )
+    );
+
    public static final Field field$ServerboundChatPacket$message = requireNonNull(
            ReflectionUtils.getDeclaredField(
                    clazz$ServerboundChatPacket, String.class, 0
            )
    );

+    public static final Field field$ServerboundChatPacket$timeStamp = requireNonNull(
+            ReflectionUtils.getDeclaredField(
+                    clazz$ServerboundChatPacket, Instant.class, 0
+            )
+    );
+
+    public static final Field field$ServerboundChatPacket$salt = requireNonNull(
+            ReflectionUtils.getDeclaredField(
+                    clazz$ServerboundChatPacket, long.class, 0
+            )
+    );
+
+    public static final Field field$ServerboundChatPacket$signature = requireNonNull(
+            ReflectionUtils.getDeclaredField(
+                    clazz$ServerboundChatPacket, clazz$MessageSignature, 0
+            )
+    );
+
+    public static final Field field$ServerboundChatPacket$lastSeenMessages = requireNonNull(
+            ReflectionUtils.getDeclaredField(
+                    clazz$ServerboundChatPacket, clazz$LastSeenMessages$Update, 0
+            )
+    );
+
    public static final Class<?> clazz$ServerboundRenameItemPacket = requireNonNull(
            ReflectionUtils.getClazz(
                    BukkitReflectionUtils.assembleMCClass("network.protocol.game.ServerboundRenameItemPacket"),
@@ -5140,4 +5190,17 @@ public class Reflections {
                    clazz$ServerboundRenameItemPacket, String.class, 0
            )
    );
+
+    public static final Class<?> clazz$ServerboundSignUpdatePacket = requireNonNull(
+            ReflectionUtils.getClazz(
+                    BukkitReflectionUtils.assembleMCClass("network.protocol.game.ServerboundSignUpdatePacket"),
+                    BukkitReflectionUtils.assembleMCClass("network.protocol.game.PacketPlayInUpdateSign")
+            )
+    );
+
+    public static final Field field$ServerboundSignUpdatePacket$lines = requireNonNull(
+            ReflectionUtils.getDeclaredField(
+                    clazz$ServerboundSignUpdatePacket, String[].class, 0
+            )
+    );
 }
--- a/core/src/main/java/net/momirealms/craftengine/core/plugin/network/NetWorkUser.java
+++ b/core/src/main/java/net/momirealms/craftengine/core/plugin/network/NetWorkUser.java
@@ -16,6 +16,8 @@ public interface NetWorkUser {

    void sendPacket(Object packet, boolean immediately);

+    void receivePacket(Object packet);
+
    @ApiStatus.Internal
    ConnectionState decoderState();