Player Detection

Overview

This example demonstrates how to detect whether a player is using Lunar Client by listening for the PlayerRegisterChannelEvent on the lunar:apollo channel. Additionally, it showcases how to enable Apollo Modules using utility methods from JsonPacketUtil

Note that this method uses a different plugin channel for sending packets, which is apollo:json, while still using the lunar:apollo for player detection.

Integration


public class ApolloPlayerJsonListener implements Listener {
 
    private static final Set<UUID> PLAYERS_RUNNING_APOLLO = new HashSet<>();
 
    public ApolloPlayerJsonListener(ApolloExamplePlugin plugin) {
        Messenger messenger = Bukkit.getServer().getMessenger();
        messenger.registerIncomingPluginChannel(plugin, "lunar:apollo", (s, player, bytes) -> { });
        messenger.registerIncomingPluginChannel(plugin, "apollo:json", (s, player, bytes) -> { });
        messenger.registerOutgoingPluginChannel(plugin, "apollo:json");
 
        Bukkit.getPluginManager().registerEvents(this, plugin);
    }
 
    public static boolean isPlayerRunningApollo(Player player) {
        return PLAYERS_RUNNING_APOLLO.contains(player.getUniqueId());
    }
 
    @EventHandler
    private void onRegisterChannel(PlayerRegisterChannelEvent event) {
        if (!event.getChannel().equalsIgnoreCase("lunar:apollo")) {
            return;
        }
 
        Player player = event.getPlayer();
        JsonPacketUtil.enableModules(player);
 
        // Sending the player's world name to the client is required for some modules
        JsonPacketUtil.sendPacket(player, this.createUpdatePlayerWorldMessage(player));
 
        PLAYERS_RUNNING_APOLLO.add(player.getUniqueId());
        player.sendMessage("You are using LunarClient!");
    }
 
    @EventHandler
    private void onPlayerChangedWorld(PlayerChangedWorldEvent event) {
        Player player = event.getPlayer();
 
        // Sending the player's world name to the client is required for some modules
        JsonPacketUtil.sendPacket(player, this.createUpdatePlayerWorldMessage(player));
    }
 
    private JsonObject createUpdatePlayerWorldMessage(Player player) {
        JsonObject message = new JsonObject();
        message.addProperty("@type", "type.googleapis.com/lunarclient.apollo.player.v1.UpdatePlayerWorldMessage");
        message.addProperty("world", player.getWorld().getName());
        return message;
    }
}