I want to retrive cookies in the 
PlayerLoginEvent and depending on the retrived cookie kick/disconnect the player or allow the player.

If i async disallow the event inside the accept of the completeable future
it wont disallow the connections as it doesnt wait for the cookies to be received.

After that i tried to just use Player.kickPlayer() but the CraftPlayer impl checks if

public ServerGamePacketListenerImpl connection of the ServerPlayer is not null otherwise it will just return. and as i understand, the ServerGamePacketListenerImpl connection field is only available after you are in game state
 
so i also cant kick the player
 
This is my impl, i think it should be made possible otherwise cookies are very weird for this event. And i need exactly this case

@EventHandler(priority = EventPriority.MONITOR)
public void onLogin(PlayerLoginEvent event) {
    Player player = event.getPlayer();


    player.retrieveCookie(CookieUtil.VERIFY_COOKIE).thenAccept(data -> {
        event.disallow(PlayerLoginEvent.Result.KICK_OTHER, "You are not allowed to join this server");
        player.kickPlayer("You are not allowed to join this server");
    });
}