Move over identified packages from old impl

SpigotCore/SpigotCore_Main/build.gradle.kts

@@ -38,6 +38,7 @@ dependencies {
     compileOnly(libs.netty)
     compileOnly(libs.authlib)
     compileOnly(libs.fastutil)
+    compileOnly(libs.nms21)
 
     implementation(libs.anvilgui)
 }

SpigotCore/SpigotCore_Main/src/de/steamwar/techhider/TechHiderUpdated.java

@@ -0,0 +1,127 @@
+package de.steamwar.techhider;
+
+import java.util.Map;
+import java.util.Set;
+import java.util.function.BiFunction;
+
+import org.bukkit.entity.Player;
+import org.bukkit.plugin.Plugin;
+
+import com.comphenix.tinyprotocol.TinyProtocol;
+
+import io.netty.channel.Channel;
+import net.minecraft.network.PacketListener;
+import net.minecraft.network.protocol.Packet;
+import net.minecraft.network.protocol.common.ClientCommonPacketListener;
+import net.minecraft.network.protocol.common.ClientboundCustomPayloadPacket;
+import net.minecraft.network.protocol.common.ClientboundKeepAlivePacket;
+import net.minecraft.network.protocol.common.ClientboundPingPacket;
+import net.minecraft.network.protocol.game.ClientboundBlockChangedAckPacket;
+import net.minecraft.network.protocol.game.ClientboundBlockEntityDataPacket;
+import net.minecraft.network.protocol.game.ClientboundBlockEventPacket;
+import net.minecraft.network.protocol.game.ClientboundBlockUpdatePacket;
+import net.minecraft.network.protocol.game.ClientboundBossEventPacket;
+import net.minecraft.network.protocol.game.ClientboundClearTitlesPacket;
+import net.minecraft.network.protocol.game.ClientboundCommandSuggestionsPacket;
+import net.minecraft.network.protocol.game.ClientboundCommandsPacket;
+import net.minecraft.network.protocol.game.ClientboundDisguisedChatPacket;
+import net.minecraft.network.protocol.game.ClientboundGameEventPacket;
+import net.minecraft.network.protocol.game.ClientboundLevelChunkWithLightPacket;
+import net.minecraft.network.protocol.game.ClientboundPlayerAbilitiesPacket;
+import net.minecraft.network.protocol.game.ClientboundPlayerChatPacket;
+import net.minecraft.network.protocol.game.ClientboundSectionBlocksUpdatePacket;
+import net.minecraft.network.protocol.game.ClientboundServerDataPacket;
+import net.minecraft.network.protocol.game.ClientboundSetDefaultSpawnPositionPacket;
+import net.minecraft.network.protocol.game.ClientboundSetExperiencePacket;
+import net.minecraft.network.protocol.game.ClientboundSetHealthPacket;
+import net.minecraft.network.protocol.game.ClientboundSetSubtitleTextPacket;
+import net.minecraft.network.protocol.game.ClientboundSetTimePacket;
+import net.minecraft.network.protocol.game.ClientboundSetTitleTextPacket;
+import net.minecraft.network.protocol.game.ClientboundSetTitlesAnimationPacket;
+import net.minecraft.network.protocol.game.ClientboundSystemChatPacket;
+import net.minecraft.network.protocol.game.ClientboundTabListPacket;
+import net.minecraft.network.protocol.game.ClientboundUpdateAttributesPacket;
+import net.minecraft.network.protocol.login.ClientboundCustomQueryPacket;
+import net.minecraft.network.protocol.login.ClientboundHelloPacket;
+import net.minecraft.network.protocol.login.ClientboundLoginCompressionPacket;
+import net.minecraft.network.protocol.login.ClientboundLoginFinishedPacket;
+
+/**
+ * The TechHider follows the default-deny security principle,
+ * any packet must be explicitly whitelisted or processed in a
+ * way that is also compliant with the principle of default-deny.
+ */
+public class TechHiderUpdated {
+    private final Set<Class<? extends Packet<? extends PacketListener>>> bypassingPackets;
+    private final Map<Class<? extends Packet<? extends PacketListener>>, BiFunction<Player, Packet<? extends PacketListener>, Packet<? extends PacketListener>>> packetProcessors;
+    private final TinyProtocol interceptor;
+
+
+    public TechHiderUpdated(Plugin plugin) {
+        this.bypassingPackets = Set.of(
+                // --- Handshake & Login Protocol ---
+                // These must be whitelisted to allow the player to actually reach the 'Play'
+                // state
+                ClientboundHelloPacket.class, // Encryption request
+                ClientboundLoginFinishedPacket.class, // Login Success
+                ClientboundLoginCompressionPacket.class, // Set Compression
+                ClientboundCustomQueryPacket.class, // Velocity/Bungee/Mod identity checks
+
+                // --- Protocol & Connection ---
+                ClientboundKeepAlivePacket.class,
+                ClientboundPingPacket.class,
+                ClientboundCustomPayloadPacket.class,
+                ClientboundServerDataPacket.class,
+
+                // --- UI & Communication ---
+                ClientboundSystemChatPacket.class,
+                ClientboundDisguisedChatPacket.class,
+                ClientboundBossEventPacket.class,
+                ClientboundTabListPacket.class,
+                ClientboundSetTitleTextPacket.class,
+                ClientboundSetSubtitleTextPacket.class,
+                ClientboundSetTitlesAnimationPacket.class,
+                ClientboundClearTitlesPacket.class,
+                ClientboundPlayerChatPacket.class,
+
+                // --- Player Stats & Logic ---
+                ClientboundSetExperiencePacket.class,
+                ClientboundSetHealthPacket.class,
+                ClientboundPlayerAbilitiesPacket.class,
+                ClientboundUpdateAttributesPacket.class,
+                ClientboundCommandSuggestionsPacket.class,
+
+                // --- World Metadata (Non-Structural) ---
+                ClientboundSetTimePacket.class,
+                ClientboundSetDefaultSpawnPositionPacket.class,
+                ClientboundGameEventPacket.class, // Weather, Gamemode changes, etc.
+                ClientboundCommandsPacket.class // Command tree for tab-complete
+        );
+
+        BiFunction<Player, Packet<? extends PacketListener>, Packet<? extends PacketListener>> tossPacket = (p, packet) -> null;
+
+        this.packetProcessors = Map.of(
+            ClientboundBlockEventPacket.class, tossPacket,
+            ClientboundBlockUpdatePacket.class, tossPacket,
+            ClientboundBlockEntityDataPacket.class, tossPacket,
+            ClientboundSectionBlocksUpdatePacket.class, tossPacket,
+            ClientboundLevelChunkWithLightPacket.class, tossPacket
+        );
+
+        this.interceptor = new TinyProtocol(plugin) {
+            @Override
+            public Object onPacketOutAsync(Player receiver, Channel channel, Object packet) {
+                if (bypassingPackets.stream().anyMatch(clazz -> clazz.isInstance(packet))) {
+                    return packet;
+                } 
+                else if (packetProcessors.containsKey(packet.getClass())) {
+                    return packetProcessors.get(packet.getClass()).apply(receiver, (Packet<? extends PacketListener>) packet);
+                }
+                else {
+                    return null;
+                }
+
+            }
+        };
+    }
+}