Twitcasting Recorded Live Downloader with Password (Requires AngleSharp)

Recast.cs

/*
 * 
 * The MIT License (MIT)
 * 
 * Copyright (C) 2018 Siketyan
 *
 * Permission is hereby granted, free of charge, to any person obtaining a copy
 * of this software and associated documentation files (the "Software"), to deal
 * in the Software without restriction, including without limitation the rights
 * to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
 * copies of the Software, and to permit persons to whom the Software is
 * furnished to do so, subject to the following conditions:
 *
 * The above copyright notice and this permission notice shall be included in all
 * copies or substantial portions of the Software.
 *
 * THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
 * IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
 * FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
 * AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
 * LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
 * OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
 * SOFTWARE.
 * 
 */

using AngleSharp.Dom.Html;
using AngleSharp.Parser.Html;
using System;
using System.Collections.Generic;
using System.IO;
using System.Net.Http;
using System.Threading.Tasks;

namespace Recast
{
    public class Program
    {
        public static async Task Main(string[] args)
        {
            var src = args[0];
            var dest = args[1];
            var password = args.Length >= 3 ? args[2] : null;
            var payload = new FormUrlEncodedContent(
                new Dictionary<string, string>
                {
                    { "password", password }
                }
            );

            Console.WriteLine($"Source: {src}");
            Console.WriteLine($"Destination: {dest}");
            Console.WriteLine($"Password: {password}");
            Console.WriteLine();

            if (File.Exists(dest))
            {
                Console.ForegroundColor = ConsoleColor.Red;
                Console.WriteLine("! Error: File already exists");
                Console.ResetColor();

                return;
            }

            Console.ForegroundColor = ConsoleColor.White;
            Console.WriteLine("> Reading metadata");

            var doc = default(IHtmlDocument);
            using (var client = new HttpClient())
            using (var response = await client.PostAsync(src, payload))
            using (var stream = await response.Content.ReadAsStreamAsync())
            {
                var parser = new HtmlParser();
                doc = await parser.ParseAsync(stream);
            }

            var player = doc.GetElementById("player");
            var m3u8 = player.GetAttribute("data-movie-url");

            Erase();
            Console.WriteLine($"> Reading playlist: {Path.GetFileName(m3u8)}");

            using (var client = new HttpClient())
            using (var stream = await client.GetStreamAsync(m3u8))
            using (var reader = new StreamReader(stream))
            using (var output = File.Open(dest, FileMode.Append))
            {
                while (!reader.EndOfStream)
                {
                    var line = await reader.ReadLineAsync();
                    if (line.StartsWith('#'))
                    {
                        continue;
                    }

                    var uri = m3u8.Replace("index.m3u8", line);

                    Erase();
                    Console.WriteLine($"> Reading segment: {Path.GetFileName(uri)}");

                    using (var input = await client.GetStreamAsync(uri))
                    {
                        await input.CopyToAsync(output);
                    }
                }
            }

            Erase();
            Console.WriteLine("> Done");
            Console.ResetColor();
        }

        private static void Erase()
        {
            Console.CursorVisible = false;

            Console.CursorTop--;
            Console.CursorLeft = 0;
            Console.Write(new string(' ', Console.WindowWidth - 1));
            Console.CursorLeft = 0;

            Console.CursorVisible = true;
        }
    }
}

can you please help me