tytd_proxy/TYTDProxy/Program.cs

using System.Net;
using Tesses.WebServer;
using YoutubeExplode;
using YoutubeExplode.Search;
using YoutubeExplode.Videos;
using YoutubeExplode.Videos.Streams;
public class TYTDProxy
{
    static YoutubeClient Youtube = new YoutubeClient();
    public static async Task Main(string[] args)
    {

        using (var token = new CancellationTokenSource())
        {
            Console.CancelKeyPress += (sender,e)=>{
                token.Cancel();
            };
            StaticServer static_server=new StaticServer("WebSite");
            RouteServer api_server=new RouteServer();
            RouteApi(api_server);
            MountableServer mountable_server=new MountableServer(static_server);
            mountable_server.Mount("/api/",api_server);

            HttpServerListener listener=new HttpServerListener(new System.Net.IPEndPoint(System.Net.IPAddress.Any,3253),mountable_server);
            await listener.ListenAsync(token.Token);
        }
    }

    public static void RouteApi(RouteServer api)
    {
        api.Add("/Video.json",Video);
        api.Add("/Video.json",Video,"POST");
        api.Add("/PreMuxed",PreMuxed);
        api.Add("/VideoOnly",VideoOnly);
        api.Add("/AudioOnly",AudioOnly);
        api.Add("/PreMuxed",PreMuxed,"POST");
        api.Add("/VideoOnly",VideoOnly,"POST");
        api.Add("/AudioOnly",AudioOnly,"POST");
        api.Add("/DownloadYTStream",DownloadYTStream,"POST");
        api.Add("/Search.json",Search,"POST");
        api.Add("/Search.json",Search);
    }
    public class StreamResult 
    {
        public StreamResult(IStreamInfo info)
        {
            url = info.Url;
            ext=info.Container.Name;
            size = info.Size.Bytes;
        }
        public string url {get;set;}

        public string ext {get;set;}

        public long size {get;set;}
    }
    public class VideoResult
    {
        public VideoResult(StreamResult muxed,StreamResult video_only,StreamResult audio_only,SavedVideo video)
        {
            this.muxed=muxed;
            this.video_only=video_only;
            this.audio_only = audio_only;
            this.video_info=video;
        }
        public StreamResult muxed {get;set;}

        public StreamResult video_only {get;set;}

        public StreamResult audio_only {get;set;}

        public SavedVideo video_info {get;set;}
    }
     public static async Task Search(ServerContext ctx)
    {
           string q;
        if(ctx.QueryParams.TryGetFirst("q",out q)){
        if(ctx.Method == "POST") ctx.ParseBody();
        if(ctx.Method != "POST") q=WebUtility.UrlDecode(q);
        {
            List<VideoSearchResult> searchResults=new List<VideoSearchResult>();
            await foreach(var item in Youtube.Search.GetVideosAsync(q))
            {
               searchResults.Add(item);
            }

            await ctx.SendJsonAsync(searchResults);
        }
        }
    }
    public static async Task PreMuxed(ServerContext ctx)
    {
         string v;
        if(ctx.QueryParams.TryGetFirst("v",out v)){
        if(ctx.Method == "POST") ctx.ParseBody();
        if(ctx.Method != "POST") v=WebUtility.UrlDecode(v);
            var vid=await Youtube.Videos.GetAsync(v);
            var res= await Youtube.Videos.Streams.GetManifestAsync(v);
            var bestMuxed=res.GetMuxedStreams().GetWithHighestVideoQuality();
            System.Net.Mime.ContentDisposition contentDisposition=new System.Net.Mime.ContentDisposition();
            contentDisposition.FileName = vid.Title;
            await ctx.SendStreamAsync(await Youtube.Videos.Streams.GetAsync(bestMuxed),$"file.{bestMuxed.Container.Name}");
        }
    }
      public static async Task VideoOnly(ServerContext ctx)
    {
         string v;
        if(ctx.QueryParams.TryGetFirst("v",out v)){
        if(ctx.Method == "POST") ctx.ParseBody();
        if(ctx.Method != "POST") v=WebUtility.UrlDecode(v);
            var vid=await Youtube.Videos.GetAsync(v);
            var res= await Youtube.Videos.Streams.GetManifestAsync(v);
            var bestVideoOnly=res.GetVideoOnlyStreams().GetWithHighestVideoQuality();
            System.Net.Mime.ContentDisposition contentDisposition=new System.Net.Mime.ContentDisposition();
            contentDisposition.FileName = vid.Title;
            await ctx.SendStreamAsync(await Youtube.Videos.Streams.GetAsync(bestVideoOnly),$"file.{bestVideoOnly.Container.Name}");
        }
    }
     public static async Task AudioOnly(ServerContext ctx)
    {
         string v;
        if(ctx.QueryParams.TryGetFirst("v",out v)){
        if(ctx.Method == "POST") ctx.ParseBody();
        if(ctx.Method != "POST") v=WebUtility.UrlDecode(v);
            var vid=await Youtube.Videos.GetAsync(v);
            var res= await Youtube.Videos.Streams.GetManifestAsync(v);
            var bestAudioOnly=res.GetAudioOnlyStreams().GetWithHighestBitrate();
            System.Net.Mime.ContentDisposition contentDisposition=new System.Net.Mime.ContentDisposition();
            contentDisposition.FileName = vid.Title;
            await ctx.SendStreamAsync(await Youtube.Videos.Streams.GetAsync(bestAudioOnly),$"file.{bestAudioOnly.Container.Name}");
        }
    }
    public class DummyStr : IStreamInfo
    {
        public DummyStr(string url,long len)
        {
            this.url = url;
            this.len=len;

        }
        long len;
        string url;
        public string Url => url;

        public Container Container => Container.Mp4;
        public FileSize Size => new FileSize(len);

        public Bitrate Bitrate => new Bitrate(420000);
    }
    public static async Task DownloadYTStream(ServerContext ctx)
    {
         string v;
         string lenTxt;
        if(ctx.QueryParams.TryGetFirst("url",out v)){
            if(ctx.QueryParams.TryGetFirst("flen",out lenTxt)){
        if(ctx.Method == "POST") ctx.ParseBody();
        if(ctx.Method != "POST") v=WebUtility.UrlDecode(v);
           long len;
           if(long.TryParse(lenTxt,out len)){

            await ctx.SendStreamAsync(await Youtube.Videos.Streams.GetAsync(new DummyStr(v,len)),HeyRed.Mime.MimeTypesMap.GetMimeType("file.bin"));
           }
        }
        }
    }
    public static async Task Video(ServerContext ctx)
    {
        string v;
        if(ctx.QueryParams.TryGetFirst("v",out v)){
        if(ctx.Method == "POST") ctx.ParseBody();
        if(ctx.Method != "POST") v=WebUtility.UrlDecode(v);

           var res= await Youtube.Videos.Streams.GetManifestAsync(v);
           var bestMuxed=new StreamResult(res.GetMuxedStreams().GetWithHighestVideoQuality());
           var bestVideoOnly=new StreamResult(res.GetVideoOnlyStreams().GetWithHighestVideoQuality());
           var bestAudioOnly=new StreamResult(res.GetAudioOnlyStreams().GetWithHighestBitrate());
           SavedVideo video = new SavedVideo(await Youtube.Videos.GetAsync(v));
           VideoResult result = new VideoResult(bestMuxed,bestVideoOnly,bestAudioOnly,video);
           await ctx.SendJsonAsync(result);

        }
    }
}