*kashike waves his wand*

src/main/java/com/velocitypowered/proxy/connection/backend/ServerConnection.java

@@ -87,7 +87,7 @@ public class ServerConnection implements MinecraftConnectionAssociation {
     private void startHandshake() {
         // Initiate a handshake.
         Handshake handshake = new Handshake();
-        handshake.setNextStatus(2); // login
+        handshake.setNextStatus(StateRegistry.LOGIN_ID);
         handshake.setProtocolVersion(proxyPlayer.getConnection().getProtocolVersion());
         if (VelocityServer.getServer().getConfiguration().getIpForwardingMode() == IPForwardingMode.LEGACY) {
             handshake.setServerAddress(createBungeeForwardingAddress());

src/main/java/com/velocitypowered/proxy/connection/client/ClientPlaySessionHandler.java

@@ -257,13 +257,16 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
 
         if (packet instanceof ScoreboardObjective) {
             ScoreboardObjective so = (ScoreboardObjective) packet;
-            if (so.getMode() == 0) {
+            switch (so.getMode()) {
-                Objective o = new Objective(so.getId());
+                case ScoreboardObjective.ADD:
-                o.setDisplayName(so.getDisplayName());
+                    Objective o = new Objective(so.getId());
-                o.setType(so.getType());
+                    o.setDisplayName(so.getDisplayName());
-                serverScoreboard.getObjectives().put(so.getId(), o);
+                    o.setType(so.getType());
-            } else {
+                    serverScoreboard.getObjectives().put(so.getId(), o);
-                serverScoreboard.getObjectives().remove(so.getId());
+                    break;
+                case ScoreboardObjective.REMOVE:
+                    serverScoreboard.getObjectives().remove(so.getId());
+                    break;
             }
         }
 
@@ -274,11 +277,11 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
                 return;
             }
             switch (sss.getAction()) {
-                case 0:
+                case ScoreboardSetScore.CHANGE:
                     Score score = new Score(sss.getEntity(), sss.getValue());
                     objective.getScores().put(sss.getEntity(), score);
                     break;
-                case 1:
+                case ScoreboardSetScore.REMOVE:
                     objective.getScores().remove(sss.getEntity());
                     break;
             }
@@ -287,12 +290,12 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
         if (packet instanceof ScoreboardTeam) {
             ScoreboardTeam st = (ScoreboardTeam) packet;
             switch (st.getMode()) {
-                case 0:
+                case ScoreboardTeam.ADD:
                     // TODO: Preserve other team information? We might not need to...
                     Team team = new Team(st.getId());
                     serverScoreboard.getTeams().put(st.getId(), team);
                     break;
-                case 1:
+                case ScoreboardTeam.REMOVE:
                     serverScoreboard.getTeams().remove(st.getId());
                     break;
             }
@@ -304,21 +307,21 @@ public class ClientPlaySessionHandler implements MinecraftSessionHandler {
             for (Score score : objective.getScores().values()) {
                 ScoreboardSetScore sss = new ScoreboardSetScore();
                 sss.setObjective(objective.getId());
-                sss.setAction((byte) 1);
+                sss.setAction(ScoreboardSetScore.REMOVE);
                 sss.setEntity(score.getTarget());
                 player.getConnection().delayedWrite(sss);
             }
 
             ScoreboardObjective so = new ScoreboardObjective();
             so.setId(objective.getId());
-            so.setMode((byte) 1);
+            so.setMode(ScoreboardObjective.REMOVE);
             player.getConnection().delayedWrite(so);
         }
 
         for (Team team : serverScoreboard.getTeams().values()) {
             ScoreboardTeam st = new ScoreboardTeam();
             st.setId(team.getId());
-            st.setMode((byte) 1);
+            st.setMode(ScoreboardTeam.REMOVE);
             player.getConnection().delayedWrite(st);
         }
 

src/main/java/com/velocitypowered/proxy/connection/client/HandshakeSessionHandler.java

@@ -25,13 +25,12 @@ public class HandshakeSessionHandler implements MinecraftSessionHandler {
 
         Handshake handshake = (Handshake) packet;
         switch (handshake.getNextStatus()) {
-            case 1:
+            case StateRegistry.STATUS_ID:
-                // Status protocol
                 connection.setState(StateRegistry.STATUS);
                 connection.setProtocolVersion(handshake.getProtocolVersion());
                 connection.setSessionHandler(new StatusSessionHandler(connection));
                 break;
-            case 2:
+            case StateRegistry.LOGIN_ID:
                 connection.setState(StateRegistry.LOGIN);
                 connection.setProtocolVersion(handshake.getProtocolVersion());
                 if (!ProtocolConstants.isSupported(handshake.getProtocolVersion())) {

src/main/java/com/velocitypowered/proxy/protocol/StateRegistry.java

@@ -124,6 +124,8 @@ public enum StateRegistry {
         }
     };
 
+    public static final int STATUS_ID = 1;
+    public static final int LOGIN_ID = 2;
     public final PacketRegistry CLIENTBOUND = new PacketRegistry(ProtocolConstants.Direction.CLIENTBOUND, this);
     public final PacketRegistry SERVERBOUND = new PacketRegistry(ProtocolConstants.Direction.SERVERBOUND, this);
 

src/main/java/com/velocitypowered/proxy/protocol/packets/BossBar.java

@@ -8,12 +8,18 @@ import io.netty.buffer.ByteBuf;
 import java.util.UUID;
 
 public class BossBar implements MinecraftPacket {
+    public static final int ADD = 0;
+    public static final int REMOVE = 1;
+    public static final int UPDATE_PERCENT = 2;
+    public static final int UPDATE_NAME = 3;
+    public static final int UPDATE_STYLE = 4;
+    public static final int UPDATE_PROPERTIES = 5;
     private UUID uuid;
     private int action;
-    private String title;
+    private String name;
-    private float health;
+    private float percent;
     private int color;
-    private int divisions;
+    private int overlay;
     private short flags;
 
     public UUID getUuid() {
@@ -32,20 +38,20 @@ public class BossBar implements MinecraftPacket {
         this.action = action;
     }
 
-    public String getTitle() {
+    public String getName() {
-        return title;
+        return name;
     }
 
-    public void setTitle(String title) {
+    public void setName(String name) {
-        this.title = title;
+        this.name = name;
     }
 
-    public float getHealth() {
+    public float getPercent() {
-        return health;
+        return percent;
     }
 
-    public void setHealth(float health) {
+    public void setPercent(float percent) {
-        this.health = health;
+        this.percent = percent;
     }
 
     public int getColor() {
@@ -56,12 +62,12 @@ public class BossBar implements MinecraftPacket {
         this.color = color;
     }
 
-    public int getDivisions() {
+    public int getOverlay() {
-        return divisions;
+        return overlay;
     }
 
-    public void setDivisions(int divisions) {
+    public void setOverlay(int overlay) {
-        this.divisions = divisions;
+        this.overlay = overlay;
     }
 
     public short getFlags() {
@@ -77,10 +83,10 @@ public class BossBar implements MinecraftPacket {
         return "BossBar{" +
                 "uuid=" + uuid +
                 ", action=" + action +
-                ", title='" + title + '\'' +
+                ", name='" + name + '\'' +
-                ", health=" + health +
+                ", percent=" + percent +
                 ", color=" + color +
-                ", divisions=" + divisions +
+                ", overlay=" + overlay +
                 ", flags=" + flags +
                 '}';
     }
@@ -90,26 +96,26 @@ public class BossBar implements MinecraftPacket {
         this.uuid = ProtocolUtils.readUuid(buf);
         this.action = ProtocolUtils.readVarInt(buf);
         switch (action) {
-            case 0: // add
+            case ADD:
-                this.title = ProtocolUtils.readString(buf);
+                this.name = ProtocolUtils.readString(buf);
-                this.health = buf.readFloat();
+                this.percent = buf.readFloat();
                 this.color = ProtocolUtils.readVarInt(buf);
-                this.divisions = ProtocolUtils.readVarInt(buf);
+                this.overlay = ProtocolUtils.readVarInt(buf);
                 this.flags = buf.readUnsignedByte();
                 break;
-            case 1: // remove
+            case REMOVE:
                 break;
-            case 2: // set health
+            case UPDATE_PERCENT:
-                this.health = buf.readFloat();
+                this.percent = buf.readFloat();
                 break;
-            case 3: // update title
+            case UPDATE_NAME:
-                this.title = ProtocolUtils.readString(buf);
+                this.name = ProtocolUtils.readString(buf);
                 break;
-            case 4: // update style
+            case UPDATE_STYLE:
                 this.color = ProtocolUtils.readVarInt(buf);
-                this.divisions = ProtocolUtils.readVarInt(buf);
+                this.overlay = ProtocolUtils.readVarInt(buf);
                 break;
-            case 5:
+            case UPDATE_PROPERTIES:
                 this.flags = buf.readUnsignedByte();
                 break;
         }
@@ -120,26 +126,26 @@ public class BossBar implements MinecraftPacket {
         ProtocolUtils.writeUuid(buf, uuid);
         ProtocolUtils.writeVarInt(buf, action);
         switch (action) {
-            case 0: // add
+            case ADD:
-                ProtocolUtils.writeString(buf, title);
+                ProtocolUtils.writeString(buf, name);
-                buf.writeFloat(health);
+                buf.writeFloat(percent);
                 ProtocolUtils.writeVarInt(buf, color);
-                ProtocolUtils.writeVarInt(buf, divisions);
+                ProtocolUtils.writeVarInt(buf, overlay);
                 buf.writeByte(flags);
                 break;
-            case 1: // remove
+            case REMOVE:
                 break;
-            case 2: // set health
+            case UPDATE_PERCENT:
-                buf.writeFloat(health);
+                buf.writeFloat(percent);
                 break;
-            case 3: // update title
+            case UPDATE_NAME:
-                ProtocolUtils.writeString(buf, title);
+                ProtocolUtils.writeString(buf, name);
                 break;
-            case 4: // update style
+            case UPDATE_STYLE:
                 ProtocolUtils.writeVarInt(buf, color);
-                ProtocolUtils.writeVarInt(buf, divisions);
+                ProtocolUtils.writeVarInt(buf, overlay);
                 break;
-            case 5:
+            case UPDATE_PROPERTIES:
                 buf.writeByte(flags);
                 break;
         }

src/main/java/com/velocitypowered/proxy/protocol/packets/Chat.java

@@ -9,15 +9,16 @@ import net.kyori.text.Component;
 import net.kyori.text.serializer.ComponentSerializers;
 
 public class Chat implements MinecraftPacket {
+    public static final byte CHAT = (byte) 0;
     private String message;
-    private byte position;
+    private byte type;
 
     public Chat() {
     }
 
-    public Chat(String message, byte position) {
+    public Chat(String message, byte type) {
         this.message = message;
-        this.position = position;
+        this.type = type;
     }
 
     public String getMessage() {
@@ -28,19 +29,19 @@ public class Chat implements MinecraftPacket {
         this.message = message;
     }
 
-    public byte getPosition() {
+    public byte getType() {
-        return position;
+        return type;
     }
 
-    public void setPosition(byte position) {
+    public void setType(byte type) {
-        this.position = position;
+        this.type = type;
     }
 
     @Override
     public String toString() {
         return "Chat{" +
                 "message='" + message + '\'' +
-                ", position=" + position +
+                ", type=" + type +
                 '}';
     }
 
@@ -48,7 +49,7 @@ public class Chat implements MinecraftPacket {
     public void decode(ByteBuf buf, ProtocolConstants.Direction direction, int protocolVersion) {
         message = ProtocolUtils.readString(buf);
         if (direction == ProtocolConstants.Direction.CLIENTBOUND) {
-            position = buf.readByte();
+            type = buf.readByte();
         }
     }
 
@@ -56,16 +57,16 @@ public class Chat implements MinecraftPacket {
     public void encode(ByteBuf buf, ProtocolConstants.Direction direction, int protocolVersion) {
         ProtocolUtils.writeString(buf, message);
         if (direction == ProtocolConstants.Direction.CLIENTBOUND) {
-            buf.writeByte(position);
+            buf.writeByte(type);
         }
     }
 
     public static Chat create(Component component) {
-        return create(component, (byte) 0);
+        return create(component, CHAT);
     }
 
-    public static Chat create(Component component, byte pos) {
+    public static Chat create(Component component, byte type) {
         Preconditions.checkNotNull(component, "component");
-        return new Chat(ComponentSerializers.JSON.serialize(component), pos);
+        return new Chat(ComponentSerializers.JSON.serialize(component), type);
     }
 }

src/main/java/com/velocitypowered/proxy/protocol/packets/ClientSettings.java

@@ -8,7 +8,7 @@ import io.netty.buffer.ByteBuf;
 public class ClientSettings implements MinecraftPacket {
     private String locale;
     private byte viewDistance;
-    private int chatMode;
+    private int chatVisibility;
     private boolean chatColors;
     private short skinParts;
     private int mainHand;
@@ -29,12 +29,12 @@ public class ClientSettings implements MinecraftPacket {
         this.viewDistance = viewDistance;
     }
 
-    public int getChatMode() {
+    public int getChatVisibility() {
-        return chatMode;
+        return chatVisibility;
     }
 
-    public void setChatMode(int chatMode) {
+    public void setChatVisibility(int chatVisibility) {
-        this.chatMode = chatMode;
+        this.chatVisibility = chatVisibility;
     }
 
     public boolean isChatColors() {
@@ -66,7 +66,7 @@ public class ClientSettings implements MinecraftPacket {
         return "ClientSettings{" +
                 "locale='" + locale + '\'' +
                 ", viewDistance=" + viewDistance +
-                ", chatMode=" + chatMode +
+                ", chatVisibility=" + chatVisibility +
                 ", chatColors=" + chatColors +
                 ", skinParts=" + skinParts +
                 ", mainHand=" + mainHand +
@@ -77,7 +77,7 @@ public class ClientSettings implements MinecraftPacket {
     public void decode(ByteBuf buf, ProtocolConstants.Direction direction, int protocolVersion) {
         this.locale = ProtocolUtils.readString(buf, 16);
         this.viewDistance = buf.readByte();
-        this.chatMode = ProtocolUtils.readVarInt(buf);
+        this.chatVisibility = ProtocolUtils.readVarInt(buf);
         this.chatColors = buf.readBoolean();
         this.skinParts = buf.readUnsignedByte();
         this.mainHand = ProtocolUtils.readVarInt(buf);
@@ -87,7 +87,7 @@ public class ClientSettings implements MinecraftPacket {
     public void encode(ByteBuf buf, ProtocolConstants.Direction direction, int protocolVersion) {
         ProtocolUtils.writeString(buf, locale);
         buf.writeByte(viewDistance);
-        ProtocolUtils.writeVarInt(buf, chatMode);
+        ProtocolUtils.writeVarInt(buf, chatVisibility);
         buf.writeBoolean(chatColors);
         buf.writeByte(skinParts);
         ProtocolUtils.writeVarInt(buf, mainHand);

src/main/java/com/velocitypowered/proxy/protocol/packets/ScoreboardObjective.java

@@ -9,6 +9,9 @@ import io.netty.buffer.ByteBuf;
 import net.kyori.text.Component;
 
 public class ScoreboardObjective implements MinecraftPacket {
+    public static final byte ADD = (byte) 0;
+    public static final byte REMOVE = (byte) 1;
+    public static final byte CHANGE = (byte) 2;
     private String id;
     private byte mode;
     private Component displayName;
@@ -60,7 +63,7 @@ public class ScoreboardObjective implements MinecraftPacket {
     public void decode(ByteBuf buf, ProtocolConstants.Direction direction, int protocolVersion) {
         this.id = ProtocolUtils.readString(buf, 16);
         this.mode = buf.readByte();
-        if (this.mode != 1) {
+        if (this.mode != REMOVE) {
             this.displayName = ProtocolUtils.readScoreboardTextComponent(buf, protocolVersion);
             if (protocolVersion >= ProtocolConstants.MINECRAFT_1_13) {
                 this.type = ScoreboardProtocolUtil.getMode(ProtocolUtils.readVarInt(buf));
@@ -74,7 +77,7 @@ public class ScoreboardObjective implements MinecraftPacket {
     public void encode(ByteBuf buf, ProtocolConstants.Direction direction, int protocolVersion) {
         ProtocolUtils.writeString(buf, id);
         buf.writeByte(mode);
-        if (this.mode != 1) {
+        if (this.mode != REMOVE) {
             ProtocolUtils.writeScoreboardTextComponent(buf, protocolVersion, displayName);
             if (protocolVersion >= ProtocolConstants.MINECRAFT_1_13) {
                 ProtocolUtils.writeVarInt(buf, type.ordinal());

src/main/java/com/velocitypowered/proxy/protocol/packets/ScoreboardSetScore.java

@@ -6,6 +6,8 @@ import com.velocitypowered.proxy.protocol.ProtocolUtils;
 import io.netty.buffer.ByteBuf;
 
 public class ScoreboardSetScore implements MinecraftPacket {
+    public static final byte CHANGE = (byte) 0;
+    public static final byte REMOVE = (byte) 1;
     private String entity;
     private byte action;
     private String objective;
@@ -58,7 +60,7 @@ public class ScoreboardSetScore implements MinecraftPacket {
         this.entity = ProtocolUtils.readString(buf, 40);
         this.action = buf.readByte();
         this.objective = ProtocolUtils.readString(buf, 16);
-        if (this.action != 1) {
+        if (this.action != REMOVE) {
             value = ProtocolUtils.readVarInt(buf);
         }
     }
@@ -68,7 +70,7 @@ public class ScoreboardSetScore implements MinecraftPacket {
         ProtocolUtils.writeString(buf, entity);
         buf.writeByte(action);
         ProtocolUtils.writeString(buf, objective);
-        if (this.action != 1) {
+        if (this.action != REMOVE) {
             ProtocolUtils.writeVarInt(buf, value);
         }
     }

src/main/java/com/velocitypowered/proxy/protocol/packets/ScoreboardTeam.java

@@ -10,6 +10,11 @@ import java.util.ArrayList;
 import java.util.List;
 
 public class ScoreboardTeam implements MinecraftPacket {
+    public static final byte ADD = (byte) 0;
+    public static final byte REMOVE = (byte) 1;
+    public static final byte UPDATE = (byte) 2;
+    public static final byte ADD_PLAYER = (byte) 3;
+    public static final byte REMOVE_PLAYER = (byte) 4;
     private String id;
     private byte mode;
 
@@ -124,8 +129,8 @@ public class ScoreboardTeam implements MinecraftPacket {
         this.mode = buf.readByte();
 
         switch (mode) {
-            case 0: // create
+            case ADD:
-            case 2: // update
+            case UPDATE:
                 this.displayName = ProtocolUtils.readScoreboardTextComponent(buf, protocolVersion);
                 if (protocolVersion <= ProtocolConstants.MINECRAFT_1_12_2) {
                     this.prefix = ProtocolUtils.readScoreboardTextComponent(buf, protocolVersion);
@@ -140,14 +145,14 @@ public class ScoreboardTeam implements MinecraftPacket {
                     this.prefix = ProtocolUtils.readScoreboardTextComponent(buf, protocolVersion);
                     this.suffix = ProtocolUtils.readScoreboardTextComponent(buf, protocolVersion);
                 }
-                if (mode == 0) {
+                if (mode == ADD) {
                     this.entities = readEntities(buf);
                 }
                 break;
-            case 1: // remove
+            case REMOVE: // remove
                 break;
-            case 3: // add player
+            case ADD_PLAYER: // add player
-            case 4: // remove player
+            case REMOVE_PLAYER: // remove player
                 this.entities = readEntities(buf);
                 break;
         }
@@ -158,8 +163,8 @@ public class ScoreboardTeam implements MinecraftPacket {
         ProtocolUtils.writeString(buf, id);
         buf.writeByte(mode);
         switch (mode) {
-            case 0: // create
+            case ADD:
-            case 2: // update
+            case UPDATE:
                 ProtocolUtils.writeScoreboardTextComponent(buf, protocolVersion, displayName);
                 if (protocolVersion <= ProtocolConstants.MINECRAFT_1_12_2) {
                     ProtocolUtils.writeScoreboardTextComponent(buf, protocolVersion, prefix);
@@ -175,14 +180,14 @@ public class ScoreboardTeam implements MinecraftPacket {
                 } else {
                     buf.writeByte(color);
                 }
-                if (mode == 0) {
+                if (mode == ADD) {
                     writeEntities(buf, entities);
                 }
                 break;
-            case 1:
+            case REMOVE:
                 break;
-            case 3:
+            case ADD_PLAYER:
-            case 4:
+            case REMOVE_PLAYER:
                 writeEntities(buf, entities);
                 break;
         }