imposter HClient 🧌

src/main/java/land/chipmunk/chipmunkmod/ChipmunkMod.java

@@ -1,6 +1,7 @@
 package land.chipmunk.chipmunkmod;
 
 import com.google.gson.GsonBuilder;
+import land.chipmunk.chipmunkmod.modules.KaboomCheck;
 import land.chipmunk.chipmunkmod.modules.Players;
 import land.chipmunk.chipmunkmod.util.gson.BlockPosTypeAdapter;
 import net.fabricmc.api.ModInitializer;
@@ -44,6 +45,7 @@ public class ChipmunkMod implements ModInitializer {
     }
 
     Players.INSTANCE.init();
+    KaboomCheck.INSTANCE.init();
 
     LOGGER.info("Loaded ChipmunkMod (chayapak's fork)");
   }

src/main/java/land/chipmunk/chipmunkmod/mixin/ClientPlayNetworkHandlerMixin.java

@@ -3,12 +3,9 @@ package land.chipmunk.chipmunkmod.mixin;
 import land.chipmunk.chipmunkmod.ChipmunkMod;
 import land.chipmunk.chipmunkmod.command.CommandManager;
 import land.chipmunk.chipmunkmod.modules.*;
-import net.minecraft.client.MinecraftClient;
 import net.minecraft.client.network.ClientDynamicRegistryType;
-import net.minecraft.client.network.PlayerListEntry;
 import net.minecraft.command.CommandRegistryAccess;
 import net.minecraft.network.packet.s2c.play.GameJoinS2CPacket;
-import net.minecraft.network.packet.s2c.play.PlayerListS2CPacket;
 import net.minecraft.network.packet.s2c.play.PlayerRemoveS2CPacket;
 import net.minecraft.registry.CombinedDynamicRegistries;
 import net.minecraft.resource.featuretoggle.FeatureSet;
@@ -18,8 +15,6 @@ import org.spongepowered.asm.mixin.injection.At;
 import org.spongepowered.asm.mixin.injection.Inject;
 import org.spongepowered.asm.mixin.injection.callback.CallbackInfo;
 
-import java.util.Iterator;
-
 @Mixin(net.minecraft.client.network.ClientPlayNetworkHandler.class)
 public class ClientPlayNetworkHandlerMixin {
   @Shadow private FeatureSet enabledFeatures;
@@ -29,6 +24,7 @@ public class ClientPlayNetworkHandlerMixin {
   private void onGameJoin (GameJoinS2CPacket packet, CallbackInfo ci) {
     final CommandRegistryAccess commandRegistryAccess = CommandRegistryAccess.of(this.combinedDynamicRegistries.getCombinedRegistryManager(), this.enabledFeatures);
 
+    KaboomCheck.INSTANCE.onJoin();
     CommandManager.INSTANCE = new CommandManager(ChipmunkMod.CONFIG.commands.prefix, commandRegistryAccess);
     SelfCare.INSTANCE.init();
     LoopCrouch.INSTANCE.init();

src/main/java/land/chipmunk/chipmunkmod/modules/CommandCore.java

@@ -56,6 +56,8 @@ public class CommandCore {
     final BlockPos relEnd = relativeArea.end();
 
     final String command = String.format(
+            KaboomCheck.INSTANCE.isKaboom() ?
+                    "fill %s %s %s %s %s %s repeating_command_block replace" :
                     "fill %s %s %s %s %s %s command_block",
             relStart.getX() + origin.getX(),
             relStart.getY() + origin.getY(),

src/main/java/land/chipmunk/chipmunkmod/modules/KaboomCheck.java

@@ -0,0 +1,98 @@
+package land.chipmunk.chipmunkmod.modules;
+
+import land.chipmunk.chipmunkmod.listeners.Listener;
+import land.chipmunk.chipmunkmod.listeners.ListenerManager;
+import lombok.Getter;
+import net.minecraft.client.MinecraftClient;
+import net.minecraft.client.network.ClientPlayNetworkHandler;
+import net.minecraft.network.packet.Packet;
+import net.minecraft.network.packet.s2c.play.SubtitleS2CPacket;
+import net.minecraft.network.packet.s2c.play.TitleS2CPacket;
+
+import java.util.Timer;
+import java.util.TimerTask;
+
+public class KaboomCheck extends Listener {
+    public static final String TITLE_START_TEXT = "Welcome to ";
+    public static final String TITLE_END_TEXT = "!";
+
+    public static final String SUBTITLE_START_TEXT = "Free OP";
+
+    @Getter private boolean isKaboom = false;
+
+    private boolean hasKaboomTitle = false;
+    private boolean hasKaboomSubtitle = false;
+
+    private Timer timer = null;
+
+    private final MinecraftClient client;
+
+    public static final KaboomCheck INSTANCE = new KaboomCheck(MinecraftClient.getInstance());
+
+    public KaboomCheck (MinecraftClient client) {
+        this.client = client;
+
+        ListenerManager.addListener(this);
+    }
+
+    public void init () {}
+
+    public void onJoin () {
+        final TimerTask task = new TimerTask() {
+            public void run () {
+                tick();
+            }
+        };
+
+        if (timer != null) cleanup();
+
+        timer = new Timer();
+
+        timer.schedule(task, 50, 50);
+    }
+
+    private void tick () {
+        final ClientPlayNetworkHandler networkHandler = client.getNetworkHandler();
+
+        if (networkHandler == null) cleanup();
+
+        if (hasKaboomTitle && hasKaboomSubtitle) isKaboom = true;
+    }
+
+    private void cleanup () {
+        if (timer == null) return;
+
+        isKaboom = false;
+        hasKaboomTitle = false;
+        hasKaboomSubtitle = false;
+
+        timer.purge();
+        timer.cancel();
+    }
+
+    @Override
+    public void packetReceived(Packet<?> packet) {
+        if (packet instanceof TitleS2CPacket) packetReceived((TitleS2CPacket) packet);
+        else if (packet instanceof SubtitleS2CPacket) packetReceived((SubtitleS2CPacket) packet);
+    }
+
+    // TODO: move this to a util class
+    private String stripSectionSigns (String text) {
+        return text.replaceAll("§.", "");
+    }
+
+    public void packetReceived(TitleS2CPacket packet) {
+        final String stripped = stripSectionSigns(packet.getTitle().getString());
+
+        if (
+                stripped.startsWith(TITLE_START_TEXT) &&
+                        stripped.endsWith(TITLE_END_TEXT)
+        ) hasKaboomTitle = true;
+    }
+
+    public void packetReceived(SubtitleS2CPacket packet) {
+        final String stripped = stripSectionSigns(packet.getSubtitle().getString());
+
+        if (stripped.startsWith(SUBTITLE_START_TEXT)) hasKaboomSubtitle = true;
+    }
+}