Allow to edit GameProfile properties.

api/src/main/java/com/velocitypowered/api/proxy/Player.java

@@ -5,7 +5,9 @@ import com.velocitypowered.api.proxy.player.PlayerSettings;
 import com.velocitypowered.api.proxy.messages.ChannelMessageSink;
 import com.velocitypowered.api.proxy.messages.ChannelMessageSource;
 import com.velocitypowered.api.proxy.server.ServerInfo;
+import com.velocitypowered.api.util.GameProfile;
 import com.velocitypowered.api.util.MessagePosition;
+import java.util.List;
 import net.kyori.text.Component;
 import org.checkerframework.checker.nullness.qual.NonNull;
 
@@ -34,6 +36,10 @@ public interface Player extends CommandSource, InboundConnection, ChannelMessage
      */
     Optional<ServerConnection> getCurrentServer();
 
+    /**
+     * Returns the player settings
+     * @return the settings
+     */
     PlayerSettings getPlayerSettings();
 
     /**
@@ -64,6 +70,18 @@ public interface Player extends CommandSource, InboundConnection, ChannelMessage
      */
     ConnectionRequestBuilder createConnectionRequest(@NonNull ServerInfo info);
 
+    /**
+     * Gets a game profile properties of player
+     * @return a immutable list of properties
+     */
+    List<GameProfile.Property> getGameProfileProperties();
+    
+    /**
+     * Sets a GameProfile properties({@link GameProfile.Property)
+     * @param properties a properties to set
+     */
+    void setGameProfileProperties(List<GameProfile.Property> properties);
+    
     /**
      * Sets the tab list header and footer for the player.
      * @param header the header component

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

@@ -54,7 +54,7 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
 
     private final MinecraftConnection connection;
     private final InetSocketAddress virtualHost;
-    private final GameProfile profile;
+    private GameProfile profile;
     private PermissionFunction permissionFunction = null;
     private int tryIndex = 0;
     private long ping = -1;
@@ -163,6 +163,17 @@ public class ConnectedPlayer implements MinecraftConnectionAssociation, Player {
         return new ConnectionRequestBuilderImpl(info);
     }
     
+    @Override
+    public List<GameProfile.Property> getGameProfileProperties() {
+        return this.profile.getProperties();
+    }
+    
+    @Override
+    public void setGameProfileProperties(List<GameProfile.Property> properties) {
+        Preconditions.checkNotNull(properties);
+        this.profile = new GameProfile(profile.getId(), profile.getName(), properties);
+    }
+
     @Override
     public void setHeaderAndFooter(@NonNull Component header, @NonNull Component footer) {
         Preconditions.checkNotNull(header, "header");