Kingkong直播弹幕姬分析（三）

using System;
using System.Net;
using System.Security.Cryptography;
using System.Text;
using System.Text.RegularExpressions;
using WebSocketSharp;

class Program
{
    static void Main(string[] args)
    {
        byte[] GetBytes(string s) => Encoding.UTF8.GetBytes(s);
        string Base64(byte[] b) => Convert.ToBase64String(b).Replace("=", "").Replace("+", "-").Replace("/", "_");
        var roomId = int.Parse(Console.ReadLine());
        var dc = new WebClient().DownloadString("https://www.kingkong.com.tw/" + roomId);
        var m = Regex.Match(dc, $"liveId":"({roomId}\\w+)"");
        var liveId = m.Success ? m.Groups[1].Value : throw new Exception("liveId miss.");
        m = Regex.Match(dc, "liveKey":"(\\w+)"");
        var liveKey = m.Success ? m.Groups[1].Value : throw new Exception("liveKey miss.");
        var guid = Guid.NewGuid().ToString().ToLower().Replace("-", "");
        var part12 = $"eyJhbGciOiJIUzI1NiIsInR5cCI6IkpXVCJ9.{Base64(GetBytes($"{{\"live_id\":\"{liveId}\",\"pfid\":\"{guid}\",\"name\":\"訪客{guid.Substring(27)}\",\"access_token\":null,\"lv\":1,\"from\":1,\"from_seq\":1,\"channel_id\":0,\"client_type\":\"web\"}}"))}";
        var token = $"{part12}.{Base64(new HMACSHA256(GetBytes("")).ComputeHash(GetBytes(part12)))}";
        var access = $"42/chat_nsp,[\"authentication\",{{\"live_id\":\"{liveId}\",\"anchor_pfid\":{roomId},\"access_token\":\"{token}\",\"token\":\"{token}\",\"from\":\"WEB\",\"client_type\":\"web\",\"r\":0}}]";
        using (var ws = new WebSocket("wss://cht.ws.kingkong.com.tw/chat_nsp/?EIO=3&transport=websocket"))
        {
            ws.OnMessage += (sender, e) =>
            {
                Console.WriteLine("Receive: " + e.Data);
                if (e.Data == "40/chat_nsp")
                {
                    Console.WriteLine("Auth pending");
                    ws.Send(access);
                }
            };
            ws.Connect();
            ws.Send("40/chat_nsp,");
            Console.WriteLine("Enter to quit.");
            Console.ReadLine();
        }
    }
}