Added support for LabyMod EmoteAPI.

api/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <artifactId>npclib</artifactId>
         <groupId>net.jitse</groupId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-api</artifactId>

api/src/main/java/net/jitse/npclib/api/NPC.java

@@ -135,4 +135,14 @@ public interface NPC {
      * @return ItemStack item.
      */
     ItemStack getItem(NPCSlot slot);
+
+    /**
+     * LABYMOD ONLY
+     * Let the NPC play an emote.
+     * (https://docs.labymod.net/pages/server/emote_api/)
+     *
+     * @param receiver The player who should see the emote.
+     * @param emoteId  The emote id (see link).
+     */
+    void forceLabyModEmote(Player receiver, int emoteId);
 }

api/src/main/java/net/jitse/npclib/internal/NPCBase.java

@@ -4,6 +4,8 @@
 
 package net.jitse.npclib.internal;
 
+import com.google.gson.JsonArray;
+import com.google.gson.JsonObject;
 import com.mojang.authlib.GameProfile;
 import com.mojang.authlib.properties.Property;
 import net.jitse.npclib.NPCLib;
@@ -14,6 +16,7 @@ import net.jitse.npclib.api.skin.Skin;
 import net.jitse.npclib.api.state.NPCSlot;
 import net.jitse.npclib.api.state.NPCState;
 import net.jitse.npclib.hologram.Hologram;
+import net.labymod.utilities.LMCUtils;
 import org.bukkit.Bukkit;
 import org.bukkit.Location;
 import org.bukkit.World;
@@ -25,10 +28,7 @@ import java.util.*;
 
 public abstract class NPCBase implements NPC, NPCPacketHandler {
 
-    protected final UUID uuid = UUID.randomUUID();
     protected final int entityId = Integer.MAX_VALUE - NPCManager.getAllNPCs().size();
-    protected final String name = uuid.toString().replace("-", "").substring(0, 10);
-    protected final GameProfile gameProfile = new GameProfile(uuid, name);
     protected final Set<UUID> hasTeamRegistered = new HashSet<>();
     protected final Set<NPCState> activeStates = EnumSet.noneOf(NPCState.class);
 
@@ -36,6 +36,11 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
     private final Set<UUID> autoHidden = new HashSet<>();
 
     protected double cosFOV = Math.cos(Math.toRadians(60));
+    // 12/4/20, JMB: Changed the UUID in order to enable LabyMod Emotes:
+    // This gives a format similar to: 528086a2-4f5f-2ec2-0000-000000000000
+    protected UUID uuid = new UUID(new Random().nextLong(), 0);
+    protected String name = uuid.toString().replace("-", "").substring(0, 10);
+    protected GameProfile gameProfile = new GameProfile(uuid, name);
 
     protected NPCLib instance;
     protected List<String> text;
@@ -86,6 +91,16 @@ public abstract class NPCBase implements NPC, NPCPacketHandler {
         }
     }
 
+    @Override
+    public void forceLabyModEmote(Player receiver, int emoteId) {
+        JsonArray array = new JsonArray();
+        JsonObject forcedEmote = new JsonObject();
+        forcedEmote.addProperty("uuid", uuid.toString());
+        forcedEmote.addProperty("emote_id", emoteId);
+        array.add(forcedEmote);
+        LMCUtils.sendLMCMessage(receiver, "emote_api", array.getAsJsonObject());
+    }
+
     public void disableFOV() {
         this.cosFOV = 0; // Or equals Math.cos(1/2 * Math.PI).
     }

api/src/main/java/net/labymod/utilities/LMCUtils.java

@@ -0,0 +1,152 @@
+package net.labymod.utilities;
+
+import com.comphenix.tinyprotocol.Reflection;
+import com.google.gson.JsonObject;
+import io.netty.buffer.ByteBuf;
+import io.netty.buffer.Unpooled;
+import io.netty.handler.codec.DecoderException;
+import io.netty.handler.codec.EncoderException;
+import org.bukkit.entity.Player;
+
+import java.nio.charset.Charset;
+
+public class LMCUtils {
+
+    private static final Class<?> CRAFT_PLAYER_CLASS = Reflection.getCraftBukkitClass("CraftPlayer");
+    private static final Reflection.MethodInvoker GET_HANDLE_METHOD = Reflection.getMethod(CRAFT_PLAYER_CLASS, "getHandle");
+    private static final Class<?> PLAYER_CONNECTION_CLASS = Reflection.getMinecraftClass("PlayerConnection");
+    private static final Reflection.FieldAccessor PLAYER_CONNECTION_FIELD = Reflection.getField(Reflection.getMinecraftClass("EntityPlayer"),
+            "playerConnection", PLAYER_CONNECTION_CLASS);
+    private static final Reflection.MethodInvoker SEND_PACKET_METHOD = Reflection.getMethod(PLAYER_CONNECTION_CLASS,
+            "sendPacket", Reflection.getMinecraftClass("Packet"));
+    private static final Class<?> PACKET_DATA_SERIALIZER_CLASS = Reflection.getMinecraftClass("PacketDataSerializer");
+    private static final Reflection.ConstructorInvoker PACKET_DATA_SERIALIZER_CONSTRUCTOR = Reflection.getConstructor(
+            PACKET_DATA_SERIALIZER_CLASS, ByteBuf.class);
+    private static final Reflection.ConstructorInvoker PACKET_PLAY_OUT_CUSTOM_PAYLOAD_CONSTRUCTOR = Reflection.getConstructor(
+            Reflection.getMinecraftClass("PacketPlayOutCustomPayload"), String.class, PACKET_DATA_SERIALIZER_CLASS);
+
+    /**
+     * Send a LMC message to the minecraft client
+     *
+     * @param player         Minecraft Client
+     * @param key            LMC message key
+     * @param messageContent json object content
+     */
+    public static void sendLMCMessage(Player player, String key, JsonObject messageContent) {
+        byte[] bytes = LMCUtils.getBytesToSend(key, messageContent.toString());
+
+        // 12/4/20, JMB: Converted into reflections for multi-version support:
+//        PacketDataSerializer pds = new PacketDataSerializer(Unpooled.wrappedBuffer(bytes));
+//        PacketPlayOutCustomPayload payloadPacket = new PacketPlayOutCustomPayload("LMC", pds);
+//        ((CraftPlayer) player).getHandle().playerConnection.sendPacket(payloadPacket);
+        Object pds = PACKET_DATA_SERIALIZER_CONSTRUCTOR.invoke(Unpooled.wrappedBuffer(bytes));
+        Object payloadPacket = PACKET_PLAY_OUT_CUSTOM_PAYLOAD_CONSTRUCTOR.invoke("LMC", pds);
+        SEND_PACKET_METHOD.invoke(PLAYER_CONNECTION_FIELD.get(GET_HANDLE_METHOD.invoke(CRAFT_PLAYER_CLASS.cast(player))), payloadPacket);
+    }
+
+    /**
+     * Gets the bytes that are required to send the given message
+     *
+     * @param messageKey      the message's key
+     * @param messageContents the message's contents
+     * @return the byte array that should be the payload
+     */
+    public static byte[] getBytesToSend(String messageKey, String messageContents) {
+        // Getting an empty buffer
+        ByteBuf byteBuf = Unpooled.buffer();
+
+        // Writing the message-key to the buffer
+        writeString(byteBuf, messageKey);
+
+        // Writing the contents to the buffer
+        writeString(byteBuf, messageContents);
+
+        // Copying the buffer's bytes to the byte array
+        byte[] bytes = new byte[byteBuf.readableBytes()];
+        byteBuf.readBytes(bytes);
+
+        // Returning the byte array
+        return bytes;
+    }
+
+    /**
+     * Writes a varint to the given byte buffer
+     *
+     * @param buf   the byte buffer the int should be written to
+     * @param input the int that should be written to the buffer
+     */
+    private static void writeVarIntToBuffer(ByteBuf buf, int input) {
+        while ((input & -128) != 0) {
+            buf.writeByte(input & 127 | 128);
+            input >>>= 7;
+        }
+
+        buf.writeByte(input);
+    }
+
+    /**
+     * Writes a string to the given byte buffer
+     *
+     * @param buf    the byte buffer the string should be written to
+     * @param string the string that should be written to the buffer
+     */
+    private static void writeString(ByteBuf buf, String string) {
+        byte[] abyte = string.getBytes(Charset.forName("UTF-8"));
+
+        if (abyte.length > Short.MAX_VALUE) {
+            throw new EncoderException("String too big (was " + string.length() + " bytes encoded, max " + Short.MAX_VALUE + ")");
+        } else {
+            writeVarIntToBuffer(buf, abyte.length);
+            buf.writeBytes(abyte);
+        }
+    }
+
+    /**
+     * Reads a varint from the given byte buffer
+     *
+     * @param buf the byte buffer the varint should be read from
+     * @return the int read
+     */
+    public static int readVarIntFromBuffer(ByteBuf buf) {
+        int i = 0;
+        int j = 0;
+
+        byte b0;
+        do {
+            b0 = buf.readByte();
+            i |= (b0 & 127) << j++ * 7;
+            if (j > 5) {
+                throw new RuntimeException("VarInt too big");
+            }
+        } while ((b0 & 128) == 128);
+
+        return i;
+    }
+
+    /**
+     * Reads a string from the given byte buffer
+     *
+     * @param buf       the byte buffer the string should be read from
+     * @param maxLength the string's max-length
+     * @return the string read
+     */
+    public static String readString(ByteBuf buf, int maxLength) {
+        int i = readVarIntFromBuffer(buf);
+
+        if (i > maxLength * 4) {
+            throw new DecoderException("The received encoded string buffer length is longer than maximum allowed (" + i + " > " + maxLength * 4 + ")");
+        } else if (i < 0) {
+            throw new DecoderException("The received encoded string buffer length is less than zero! Weird string!");
+        } else {
+            byte[] bytes = new byte[i];
+            buf.readBytes(bytes);
+
+            String s = new String(bytes, Charset.forName("UTF-8"));
+            if (s.length() > maxLength) {
+                throw new DecoderException("The received string length is longer than maximum allowed (" + i + " > " + maxLength + ")");
+            } else {
+                return s;
+            }
+        }
+    }
+}

nms/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms</artifactId>

nms/v1_10_R1/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_10_R1</artifactId>

nms/v1_11_R1/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_11_R1</artifactId>

nms/v1_12_R1/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_12_R1</artifactId>

nms/v1_13_R1/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_13_R1</artifactId>

nms/v1_13_R2/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_13_R2</artifactId>

nms/v1_14_R1/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_14_R1</artifactId>

nms/v1_15_R1/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_15_R1</artifactId>

nms/v1_8_R2/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_8_R2</artifactId>

nms/v1_8_R3/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_8_R3</artifactId>

nms/v1_9_R1/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_9_R1</artifactId>

nms/v1_9_R2/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib-nms</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-nms-v1_9_R2</artifactId>

plugin/pom.xml

@@ -8,7 +8,7 @@
     <parent>
         <groupId>net.jitse</groupId>
         <artifactId>npclib</artifactId>
-        <version>2.4.2-SNAPSHOT</version>
+        <version>2.5-SNAPSHOT</version>
     </parent>
 
     <artifactId>npclib-plugin</artifactId>

pom.xml

@@ -7,7 +7,7 @@
 
     <groupId>net.jitse</groupId>
     <artifactId>npclib</artifactId>
-    <version>2.4.2-SNAPSHOT</version>
+    <version>2.5-SNAPSHOT</version>
 
     <properties>
         <project.build.sourceEncoding>UTF-8</project.build.sourceEncoding>