Lidarr/src/NzbDrone.Core/Download/TorrentClientBase.cs

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C#
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using System;
using System.Net;
using MonoTorrent;
using NzbDrone.Common.Disk;
using NzbDrone.Common.Extensions;
using NzbDrone.Common.Http;
using NzbDrone.Core.Exceptions;
using NzbDrone.Core.Indexers;
using NzbDrone.Core.MediaFiles.TorrentInfo;
using NzbDrone.Core.Organizer;
using NzbDrone.Core.Parser.Model;
using NzbDrone.Core.ThingiProvider;
using NzbDrone.Core.Configuration;
using NLog;
using NzbDrone.Core.RemotePathMappings;
namespace NzbDrone.Core.Download
{
public abstract class TorrentClientBase<TSettings> : DownloadClientBase<TSettings>
where TSettings : IProviderConfig, new()
{
protected readonly IHttpClient _httpClient;
protected readonly ITorrentFileInfoReader _torrentFileInfoReader;
protected TorrentClientBase(ITorrentFileInfoReader torrentFileInfoReader,
IHttpClient httpClient,
IConfigService configService,
IDiskProvider diskProvider,
IRemotePathMappingService remotePathMappingService,
Logger logger)
: base(configService, diskProvider, remotePathMappingService, logger)
{
_httpClient = httpClient;
_torrentFileInfoReader = torrentFileInfoReader;
}
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public override DownloadProtocol Protocol => DownloadProtocol.Torrent;
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public virtual bool PreferTorrentFile => false;
protected abstract string AddFromMagnetLink(RemoteAlbum remoteAlbum, string hash, string magnetLink);
protected abstract string AddFromTorrentFile(RemoteAlbum remoteAlbum, string hash, string filename, byte[] fileContent);
public override string Download(RemoteAlbum remoteAlbum)
{
var torrentInfo = remoteAlbum.Release as TorrentInfo;
string magnetUrl = null;
string torrentUrl = null;
if (remoteAlbum.Release.DownloadUrl.IsNotNullOrWhiteSpace() && remoteAlbum.Release.DownloadUrl.StartsWith("magnet:"))
{
magnetUrl = remoteAlbum.Release.DownloadUrl;
}
else
{
torrentUrl = remoteAlbum.Release.DownloadUrl;
}
if (torrentInfo != null && !torrentInfo.MagnetUrl.IsNullOrWhiteSpace())
{
magnetUrl = torrentInfo.MagnetUrl;
}
if (PreferTorrentFile)
{
if (torrentUrl.IsNotNullOrWhiteSpace())
{
try
{
return DownloadFromWebUrl(remoteAlbum, torrentUrl);
}
catch (Exception ex)
{
if (!magnetUrl.IsNullOrWhiteSpace())
{
throw;
}
_logger.Debug("Torrent download failed, trying magnet. ({0})", ex.Message);
}
}
if (magnetUrl.IsNotNullOrWhiteSpace())
{
try
{
return DownloadFromMagnetUrl(remoteAlbum, magnetUrl);
}
catch (NotSupportedException ex)
{
throw new ReleaseDownloadException(remoteAlbum.Release, "Magnet not supported by download client. ({0})", ex.Message);
}
}
}
else
{
if (magnetUrl.IsNotNullOrWhiteSpace())
{
try
{
return DownloadFromMagnetUrl(remoteAlbum, magnetUrl);
}
catch (NotSupportedException ex)
{
if (torrentUrl.IsNullOrWhiteSpace())
{
throw new ReleaseDownloadException(remoteAlbum.Release, "Magnet not supported by download client. ({0})", ex.Message);
}
_logger.Debug("Magnet not supported by download client, trying torrent. ({0})", ex.Message);
}
}
if (torrentUrl.IsNotNullOrWhiteSpace())
{
return DownloadFromWebUrl(remoteAlbum, torrentUrl);
}
}
return null;
}
private string DownloadFromWebUrl(RemoteAlbum remoteAlbum, string torrentUrl)
{
byte[] torrentFile = null;
try
{
var request = new HttpRequest(torrentUrl);
request.Headers.Accept = "application/x-bittorrent";
request.AllowAutoRedirect = false;
var response = _httpClient.Get(request);
if (response.StatusCode == HttpStatusCode.MovedPermanently ||
response.StatusCode == HttpStatusCode.Found ||
response.StatusCode == HttpStatusCode.SeeOther)
{
var locationHeader = response.Headers.GetSingleValue("Location");
_logger.Trace("Torrent request is being redirected to: {0}", locationHeader);
if (locationHeader != null)
{
if (locationHeader.StartsWith("magnet:"))
{
return DownloadFromMagnetUrl(remoteAlbum, locationHeader);
}
return DownloadFromWebUrl(remoteAlbum, locationHeader);
}
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throw new WebException("Remote website tried to redirect without providing a location.");
}
torrentFile = response.ResponseData;
_logger.Debug("Downloading torrent for release '{0}' finished ({1} bytes from {2})", remoteAlbum.Release.Title, torrentFile.Length, torrentUrl);
}
catch (HttpException ex)
{
if ((int)ex.Response.StatusCode == 429)
{
_logger.Error("API Grab Limit reached for {0}", torrentUrl);
}
else
{
_logger.Error(ex, "Downloading torrent file for release '{0}' failed ({1})", remoteAlbum.Release.Title, torrentUrl);
}
throw new ReleaseDownloadException(remoteAlbum.Release, "Downloading torrent failed", ex);
}
catch (WebException ex)
{
_logger.Error(ex, "Downloading torrent file for release '{0}' failed ({1})", remoteAlbum.Release.Title, torrentUrl);
throw new ReleaseDownloadException(remoteAlbum.Release, "Downloading torrent failed", ex);
}
var filename = string.Format("{0}.torrent", FileNameBuilder.CleanFileName(remoteAlbum.Release.Title));
var hash = _torrentFileInfoReader.GetHashFromTorrentFile(torrentFile);
var actualHash = AddFromTorrentFile(remoteAlbum, hash, filename, torrentFile);
if (actualHash.IsNotNullOrWhiteSpace() && hash != actualHash)
{
_logger.Debug(
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"{0} did not return the expected InfoHash for '{1}', Lidarr could potentially lose track of the download in progress.",
Definition.Implementation, remoteAlbum.Release.DownloadUrl);
}
return actualHash;
}
private string DownloadFromMagnetUrl(RemoteAlbum remoteAlbum, string magnetUrl)
{
string hash = null;
string actualHash = null;
try
{
hash = new MagnetLink(magnetUrl).InfoHash.ToHex();
}
catch (FormatException ex)
{
_logger.Error(ex, "Failed to parse magnetlink for release '{0}': '{1}'", remoteAlbum.Release.Title, magnetUrl);
return null;
}
if (hash != null)
{
actualHash = AddFromMagnetLink(remoteAlbum, hash, magnetUrl);
}
if (actualHash.IsNotNullOrWhiteSpace() && hash != actualHash)
{
_logger.Debug(
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"{0} did not return the expected InfoHash for '{1}', Lidarr could potentially lose track of the download in progress.",
Definition.Implementation, remoteAlbum.Release.DownloadUrl);
}
return actualHash;
}
}
}