net.minestom.server.network.packet.client.handshake.ClientHandshakePacket Maven / Gradle / Ivy

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1.20.4 Lightweight Minecraft server

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package net.minestom.server.network.packet.client.handshake;

import net.minestom.server.extras.bungee.BungeeCordProxy;
import net.minestom.server.network.NetworkBuffer;
import net.minestom.server.network.NetworkBufferTemplate;
import net.minestom.server.network.packet.client.ClientPacket;
import org.jetbrains.annotations.NotNull;

import static net.minestom.server.network.NetworkBuffer.*;

public record ClientHandshakePacket(int protocolVersion, @NotNull String serverAddress,
                                    int serverPort, @NotNull Intent intent) implements ClientPacket {

    public ClientHandshakePacket {
        if (serverAddress.length() > maxHandshakeLength()) {
            throw new IllegalArgumentException("Server address too long: " + serverAddress.length());
        }
    }

    public static final NetworkBuffer.Type SERIALIZER = NetworkBufferTemplate.template(
            VAR_INT, ClientHandshakePacket::protocolVersion,
            STRING, ClientHandshakePacket::serverAddress,
            UNSIGNED_SHORT, ClientHandshakePacket::serverPort,
            VAR_INT.transform(Intent::fromId, Intent::id), ClientHandshakePacket::intent,
            ClientHandshakePacket::new);

    private static int maxHandshakeLength() {
        // BungeeGuard limits handshake length to 2500 characters, while vanilla limits it to 255
        return BungeeCordProxy.isEnabled() ? (BungeeCordProxy.isBungeeGuardEnabled() ? 2500 : Short.MAX_VALUE) : 255;
    }

    public enum Intent {
        STATUS,
        LOGIN,
        TRANSFER;

        public static @NotNull Intent fromId(int id) {
            return switch (id) {
                case 1 -> STATUS;
                case 2 -> LOGIN;
                case 3 -> TRANSFER;
                default -> throw new IllegalArgumentException("Unknown connection intent: " + id);
            };
        }

        public int id() {
            return ordinal() + 1;
        }
    }
}