UpdateHealthPacket

protocol/src/main/java/mc/protocol/State.java

@@ -50,17 +50,18 @@ public enum State {
 					0x0B, PingPacket.class,
 					0x0D, PlayerPositionPacket.class,
 					0x0E, CPlayerPositionAndLookPacket.class,
-					0x0F, PlayerLookPacket.class
+					0x0F, PlayerLookPacket.class,
+					0x15, EntityActionPacket.class
 			),
 			// client bound
 			Map.of(
 					PingPacket.class, 0x1F,
-					JoinGamePacket.class, 0x23,
-					SpawnPositionPacket.class, 0x46,
 					ChunkDataPacket.class, 0x20,
+					JoinGamePacket.class, 0x23,
 					PlayerAbilitiesPacket.class,0x2C,
 					SPlayerPositionAndLookPacket.class, 0x2F,
-					TitlePacket.class, 0x48
+					UpdateHealthPacket.class, 0x41,
+					SpawnPositionPacket.class, 0x46
 			)
 	);
 

protocol/src/main/java/mc/protocol/packets/client/EntityActionPacket.java

@@ -0,0 +1,52 @@
+package mc.protocol.packets.client;
+
+import lombok.EqualsAndHashCode;
+import lombok.Getter;
+import lombok.NoArgsConstructor;
+import lombok.ToString;
+import mc.protocol.io.NetByteBuf;
+import mc.protocol.packets.ClientSidePacket;
+import mc.protocol.utils.EntityActionAction;
+
+/**
+ * Entity Action packet.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD      | TYPE   | NOTES                                     |
+ * |------------|--------|-------------------------------------------|
+ * | Entity ID  | VarInt | ID игрока                                 |
+ * | Action ID  | VarInt | ID действия                               |
+ * | Jump Boost | VarInt | Используется только при "Action ID" = 5.  |
+ * |            |        | В этом случае значение будет от 0 до 100. |
+ * |            |        | В остальных случаях значение 0.           |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Entity_Action" target="_top">Entity Action</a>
+ */
+@NoArgsConstructor
+@Getter
+@EqualsAndHashCode
+@ToString
+public class EntityActionPacket implements ClientSidePacket {
+
+	private Integer entityId;
+	private EntityActionAction action;
+	private Integer jumpBoost;
+
+	@Override
+	public void readSelf(NetByteBuf netByteBuf) {
+		this.entityId = netByteBuf.readVarInt();
+		int actionId = netByteBuf.readVarInt();
+		this.jumpBoost = netByteBuf.readVarInt();
+
+		this.action = EntityActionAction.valueOfCode(actionId);
+	}
+
+	@Override
+	public void passivate() {
+		this.entityId = null;
+		this.action = null;
+		this.jumpBoost = null;
+	}
+}

protocol/src/main/java/mc/protocol/packets/server/TitlePacket.java

@@ -1,82 +0,0 @@
-package mc.protocol.packets.server;
-
-import lombok.Data;
-import mc.protocol.io.NetByteBuf;
-import mc.protocol.model.text.Text;
-import mc.protocol.model.text.TextColor;
-import mc.protocol.model.text.TextStyle;
-import mc.protocol.packets.ServerSidePacket;
-import mc.protocol.serializer.TextSerializer;
-import mc.protocol.utils.TitleAction;
-
-/**
- * Title packet.
- *
- * <p>Структура пакета</p>
- * <pre>
- * | FIELD       | TYPE        | NOTES                            |
- * |-------------|-------------|----------------------------------|
- * | Action      | VarInt      | Определяет остальные поля пакета |
- * | Data fields | -           | зависят от "Action"              |
- * </pre>
- *
- * <p>Варианты "Action"</p>
- * <pre>
- * | ACTION                        | FIELD           | TYPE    | NOTES                                           |
- * | VALUE | DESCRIPTION           |                 |         |                                                 |
- * |-------|-----------------------|-----------------|---------|-------------------------------------------------|
- * | 0     | set title             | Title Text      | Text    |                                                 |
- * | 1     | set subtitle          | Subtitle Text   | Text    |                                                 |
- * | 2     | set action bar        | Action bar text | Text    | [*]                                             |
- * | 3     | set times and display | Fade In         | Integer | Время (в тиках (tick)) на эфект появления       |
- * |       |                       | Stay            | Integer | Время (в тиках (tick)) на отображение на экране |
- * |       |                       | Fade Out        | Integer | Время (в тиках (tick)) на эфект исчезания       |
- * | 4     | hide                  | -               | -       |                                                 |
- * | 5     | reset                 | -               | -       |                                                 |
- * </pre>
- *
- * <p>
- *     * - стоит обратить внимание, что {@link TextColor} и {@link TextStyle} не работают: клиент не применяет
- *     стилистику в таком виде. Однако метод через символ "§" (\<span>u00a7</span>) работает.
- * </p>
- *
- * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Title">Title</a>
- */
-@Data
-public class TitlePacket implements ServerSidePacket {
-
-	private TitleAction action;
-
-	private Text title;
-	private Text subtitle;
-	private Text actionbar;
-	private Integer fadeIn;
-	private Integer stay;
-	private Integer fadeOut;
-
-	@Override
-	public void writeSelf(NetByteBuf netByteBuf) {
-		netByteBuf.writeVarInt(this.action.getCode());
-
-		switch (this.action) {
-			case SET_TITLE:
-				netByteBuf.writeString(TextSerializer.toJsonObject(this.title).toString());
-				break;
-			case SET_SUBTITLE:
-				netByteBuf.writeString(TextSerializer.toJsonObject(this.subtitle).toString());
-				break;
-			case SET_ACTIONBAR:
-				netByteBuf.writeString(TextSerializer.toJsonObject(this.actionbar).toString());
-				break;
-			case SET_TIMES_AND_DISPLAY:
-				netByteBuf.writeInt(fadeIn);
-				netByteBuf.writeInt(stay);
-				netByteBuf.writeInt(fadeOut);
-				break;
-			case HIDE:
-			case RESET:
-			default:
-				break;
-		}
-	}
-}

protocol/src/main/java/mc/protocol/packets/server/UpdateHealthPacket.java

@@ -0,0 +1,35 @@
+package mc.protocol.packets.server;
+
+import lombok.Data;
+import mc.protocol.io.NetByteBuf;
+import mc.protocol.packets.ServerSidePacket;
+
+/**
+ * Update Health Packet.
+ *
+ * <p>Структура пакета</p>
+ * <pre>
+ * | FIELD           | TYPE   | NOTES                            |
+ * |-----------------|--------|----------------------------------|
+ * | Health          | Float  | 0 = смерть; 20 = полное здоровье |
+ * | Food            | VarInt | 0-20                             |
+ * | Food Saturation | Float  | 0-5                              |
+ * </pre>
+ *
+ * @see <a href="https://wiki.vg/index.php?title=Protocol&oldid=14204#Update_Health">Update Health</a>
+ * @see <a href="https://minecraft.fandom.com/wiki/Food#Hunger_and_saturation">Food: Hunger and saturation</a>
+ */
+@Data
+public class UpdateHealthPacket implements ServerSidePacket {
+
+	private float health;
+	private int food;
+	private float foodSaturation;
+
+	@Override
+	public void writeSelf(NetByteBuf netByteBuf) {
+		netByteBuf.writeFloat(this.health);
+		netByteBuf.writeVarInt(this.food);
+		netByteBuf.writeFloat(this.foodSaturation);
+	}
+}

protocol/src/main/java/mc/protocol/utils/EntityActionAction.java

@@ -0,0 +1,33 @@
+package mc.protocol.utils;
+
+import lombok.Getter;
+import lombok.RequiredArgsConstructor;
+
+import javax.annotation.Nullable;
+
+@RequiredArgsConstructor
+public enum EntityActionAction {
+	START_SNEAKING(0),
+	STOP_SNEAKING(1),
+	LEAVE_BED(2),
+	START_SPRINTING(3),
+	STOP_SPRINTING(4),
+	START_JUMP_WITH_HORSE(5),
+	STOP_JUMP_WITH_HORSE(6),
+	OPEN_HORSE_INVENTORY(7),
+	START_FLYING_WITH_ELYTRA(8);
+
+	@Nullable
+	public static EntityActionAction valueOfCode(int code) {
+		for (EntityActionAction action : EntityActionAction.values()) {
+			if (action.code == code) {
+				return action;
+			}
+		}
+
+		return null;
+	}
+
+	@Getter
+	private final int code;
+}

protocol/src/main/java/mc/protocol/utils/TitleAction.java

@@ -1,17 +0,0 @@
-package mc.protocol.utils;
-
-import lombok.Getter;
-import lombok.RequiredArgsConstructor;
-
-@RequiredArgsConstructor
-public enum TitleAction {
-	SET_TITLE(0),
-	SET_SUBTITLE(1),
-	SET_ACTIONBAR(2),
-	SET_TIMES_AND_DISPLAY(3),
-	HIDE(4),
-	RESET(5);
-
-	@Getter
-	private final int code;
-}

server/src/main/java/mc/server/PacketHandler.java

@@ -7,7 +7,6 @@ import mc.protocol.api.ConnectionContext;
 import mc.protocol.model.Location;
 import mc.protocol.model.Look;
 import mc.protocol.model.ServerInfo;
-import mc.protocol.model.text.Text;
 import mc.protocol.packets.PingPacket;
 import mc.protocol.packets.client.HandshakePacket;
 import mc.protocol.packets.client.LoginStartPacket;
@@ -17,7 +16,6 @@ import mc.protocol.serializer.TextSerializer;
 import mc.protocol.utils.Difficulty;
 import mc.protocol.utils.GameMode;
 import mc.protocol.utils.LevelType;
-import mc.protocol.utils.TitleAction;
 import mc.server.config.Config;
 import org.apache.commons.io.IOUtils;
 
@@ -28,6 +26,7 @@ import java.util.Base64;
 import java.util.Collections;
 import java.util.Random;
 import java.util.UUID;
+import java.util.concurrent.TimeUnit;
 
 @Slf4j
 @RequiredArgsConstructor
@@ -69,6 +68,7 @@ public class PacketHandler {
 		context.sendNow(response);
 	}
 
+	@SuppressWarnings("java:S2189")
 	public void onLoginStart(ConnectionContext context, LoginStartPacket loginStartPacket) {
 		var loginSuccessPacket = new LoginSuccessPacket();
 		loginSuccessPacket.setUuid(UUID.randomUUID());
@@ -127,11 +127,29 @@ public class PacketHandler {
 
 		// -- Эксперименты -- //
 
-		var titlePacket = new TitlePacket();
+		var updateHealthPacket = new UpdateHealthPacket();
-		titlePacket.setAction(TitleAction.SET_TITLE);
+		updateHealthPacket.setHealth(0.1f);
-		titlePacket.setTitle(Text.of("HELLO"));
+		updateHealthPacket.setFood(0);
+		updateHealthPacket.setFoodSaturation(5.0f);
 
-		context.sendNow(titlePacket);
+		context.sendNow(updateHealthPacket);
+
+		while (true) {
+			context.sendNow(updateHealthPacket);
+
+			updateHealthPacket.setHealth(updateHealthPacket.getHealth() + 1.0f);
+			updateHealthPacket.setFood(updateHealthPacket.getFood() + 1);
+			if (updateHealthPacket.getHealth() > 20.0f) {
+				updateHealthPacket.setHealth(0.1f);
+				updateHealthPacket.setFood(0);
+			}
+
+			try {
+				TimeUnit.MILLISECONDS.sleep(50);
+			} catch (InterruptedException e) {
+				break;
+			}
+		}
 	}
 
 	private static String faviconToBase64(Path iconPath) {