roadie/Roadie.Dlna/Server/Responses/ItemResponse.cs

using Roadie.Dlna.Server.Metadata;
using System;
using System.IO;

namespace Roadie.Dlna.Server
{
    internal sealed class ItemResponse : IResponse
    {
        private readonly Headers headers;

        private readonly IMediaResource item;

        public Stream Body => item.CreateContentStream();

        public IHeaders Headers => headers;

        public HttpCode Status { get; } = HttpCode.Ok;

        public ItemResponse(string prefix, IRequest request, IMediaResource item,
                              string transferMode = "Streaming")
        {
            this.item = item;
            headers = new ResponseHeaders(!(item is IMediaCoverResource));
            var meta = item as IMetaInfo;
            if (meta != null)
            {
                headers.Add("Content-Length", meta.InfoSize.ToString());
                headers.Add("Last-Modified", meta.InfoDate.ToString("R"));
            }
            headers.Add("Accept-Ranges", "bytes");
            headers.Add("Content-Type", DlnaMaps.Mime[item.Type]);
            if (request.Headers.ContainsKey("getcontentFeatures.dlna.org"))
            {
                try
                {
                    headers.Add(
                      "contentFeatures.dlna.org",
                      item.MediaType == DlnaMediaTypes.Image
                        ? $"DLNA.ORG_PN={item.PN};DLNA.ORG_OP=00;DLNA.ORG_CI=0;DLNA.ORG_FLAGS={DlnaMaps.DefaultInteractive}"
                        : $"DLNA.ORG_PN={item.PN};DLNA.ORG_OP=01;DLNA.ORG_CI=0;DLNA.ORG_FLAGS={DlnaMaps.DefaultStreaming}"
                      );
                }
                catch (NotSupportedException)
                {
                }
                catch (NotImplementedException)
                {
                }
            }
            if (request.Headers.ContainsKey("getCaptionInfo.sec"))
            {
                var mvi = item as IMetaVideoItem;
                if (mvi != null && mvi.Subtitle.HasSubtitle)
                {
                    var surl =
                      $"http://{request.LocalEndPoint.Address}:{request.LocalEndPoint.Port}{prefix}subtitle/{item.Id}/st.srt";
                    headers.Add("CaptionInfo.sec", surl);
                }
            }
            if (request.Headers.ContainsKey("getMediaInfo.sec"))
            {
                var md = item as IMetaDuration;
                if (md?.MetaDuration != null)
                {
                    headers.Add(
                      "MediaInfo.sec",
                      $"SEC_Duration={md.MetaDuration.Value.TotalMilliseconds};"
                      );
                }
            }
            headers.Add("transferMode.dlna.org", transferMode);
        }
    }
}