Added gamemode switching in config. Sending player abilities packet to disable flying in spectator mode

build.gradle

@@ -4,7 +4,7 @@ plugins {
 }
 
 group 'ru.nanit'
-version '1.0'
+version '1.1'
 
 repositories {
     mavenCentral()

src/main/java/ru/nanit/limbo/configuration/LimboConfig.java

@@ -19,6 +19,7 @@ public final class LimboConfig {
 
     private String dimensionType;
     private Position spawnPosition;
+    private int gameMode;
 
     private boolean useJoinMessage;
     private boolean useBossBar;
@@ -45,6 +46,7 @@ public final class LimboConfig {
         pingData = conf.getNode("ping").getValue(PingData.class);
         dimensionType = conf.getNode("dimension").getString();
         spawnPosition = conf.getNode("spawnPosition").getValue(Position.class);
+        gameMode = conf.getNode("gameMode").getInt();
         useJoinMessage = conf.getNode("joinMessage", "enable").getBoolean();
         useBossBar = conf.getNode("bossBar", "enable").getBoolean();
 
@@ -79,6 +81,10 @@ public final class LimboConfig {
         return spawnPosition;
     }
 
+    public int getGameMode() {
+        return gameMode;
+    }
+
     public InfoForwarding getInfoForwarding() {
         return infoForwarding;
     }

src/main/java/ru/nanit/limbo/connection/ClientConnection.java

@@ -186,7 +186,7 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         joinGame.setEntityId(0);
         joinGame.setEnableRespawnScreen(true);
         joinGame.setFlat(false);
-        joinGame.setGameMode(2);
+        joinGame.setGameMode(server.getConfig().getGameMode());
         joinGame.setHardcore(false);
         joinGame.setMaxPlayers(server.getConfig().getMaxPlayers());
         joinGame.setPreviousGameMode(-1);
@@ -199,6 +199,12 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         joinGame.setDimensionCodec(server.getDimensionRegistry().getCodec());
         joinGame.setDimension(server.getDimensionRegistry().getDefaultDimension());
 
+        PacketPlayerAbilities abilities = new PacketPlayerAbilities();
+
+        abilities.setFlyingSpeed(0.0F);
+        abilities.setFlags(0x02);
+        abilities.setFieldOfView(0.1F);
+
         PacketPlayerPositionAndLook positionAndLook = new PacketPlayerPositionAndLook();
 
         positionAndLook.setX(server.getConfig().getSpawnPosition().getX());
@@ -211,9 +217,10 @@ public class ClientConnection extends ChannelInboundHandlerAdapter {
         PacketPlayerInfo info = new PacketPlayerInfo();
 
         info.setConnection(this);
-        info.setGameMode(2);
+        info.setGameMode(server.getConfig().getGameMode());
 
         sendPacket(joinGame);
+        sendPacket(abilities);
         sendPacket(positionAndLook);
         sendPacket(info);
 

src/main/java/ru/nanit/limbo/protocol/packets/play/PacketPlayerAbilities.java

@@ -0,0 +1,31 @@
+package ru.nanit.limbo.protocol.packets.play;
+
+import ru.nanit.limbo.protocol.ByteMessage;
+import ru.nanit.limbo.protocol.PacketOut;
+
+public class PacketPlayerAbilities implements PacketOut {
+
+    private int flags = 0x02;
+    private float flyingSpeed = 0.0F;
+    private float fieldOfView = 0.1F;
+
+    public void setFlags(int flags) {
+        this.flags = flags;
+    }
+
+    public void setFlyingSpeed(float flyingSpeed) {
+        this.flyingSpeed = flyingSpeed;
+    }
+
+    public void setFieldOfView(float fieldOfView) {
+        this.fieldOfView = fieldOfView;
+    }
+
+    @Override
+    public void encode(ByteMessage msg) {
+        msg.writeByte(flags);
+        msg.writeFloat(flyingSpeed);
+        msg.writeFloat(fieldOfView);
+    }
+
+}

src/main/java/ru/nanit/limbo/protocol/registry/State.java

@@ -40,6 +40,7 @@ public enum State {
         {
             serverBound.register(0x10, PacketKeepAlive::new);
             clientBound.register(0x24, PacketJoinGame::new);
+            clientBound.register(0x30, PacketPlayerAbilities::new);
             clientBound.register(0x34, PacketPlayerPositionAndLook::new);
             clientBound.register(0x1F, PacketKeepAlive::new);
             clientBound.register(0x0E, PacketChatMessage::new);

src/main/resources/settings.yml

@@ -26,6 +26,13 @@ spawnPosition:
   yaw: 0.0
   pitch: 0.0
 
+# Setup player's game mode
+# 0 - Survival
+# 1 - Creative (hide HP and food bar)
+# 2 - Adventure
+# 3 - Spectator (hide all UI bars)
+gameMode: 1
+
 # Message sends when player join to server
 joinMessage:
   enable: true