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TorrentRssSettingsDetector.cs
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TorrentRssSettingsDetector.cs
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using System;
using System.IO;
using System.Linq;
using System.Xml;
using System.Xml.Linq;
using NLog;
using NzbDrone.Common.Extensions;
using NzbDrone.Common.Http;
using NzbDrone.Core.Indexers.Exceptions;
using NzbDrone.Core.IndexerSearch.Definitions;
using NzbDrone.Core.Parser.Model;
using NzbDrone.Core.ThingiProvider;
namespace NzbDrone.Core.Indexers.Definitions.TorrentRss
{
public interface ITorrentRssSettingsDetector
{
TorrentRssIndexerParserSettings Detect(TorrentRssIndexerSettings settings, ProviderDefinition definition);
}
public class TorrentRssSettingsDetector : ITorrentRssSettingsDetector
{
private const long ValidSizeThreshold = 2 * 1024 * 1024;
private readonly IIndexerHttpClient _httpClient;
private readonly Logger _logger;
public TorrentRssSettingsDetector(IIndexerHttpClient httpClient, Logger logger)
{
_httpClient = httpClient;
_logger = logger;
}
public TorrentRssIndexerParserSettings Detect(TorrentRssIndexerSettings settings, ProviderDefinition definition)
{
_logger.Debug("Evaluating TorrentRss feed '{0}'", settings.BaseUrl);
try
{
var requestGenerator = new TorrentRssIndexerRequestGenerator { Settings = settings };
var request = requestGenerator.GetSearchRequests(new BasicSearchCriteria()).GetAllTiers().First().First();
HttpResponse httpResponse;
try
{
httpResponse = _httpClient.ExecuteProxied(request.HttpRequest, definition);
}
catch (Exception ex)
{
_logger.Warn(ex, "Unable to connect to indexer {0}: {1}", request.Url, ex.Message);
return null;
}
var indexerResponse = new IndexerResponse(request, httpResponse);
return GetParserSettings(indexerResponse, settings);
}
catch (Exception ex)
{
ex.WithData("FeedUrl", settings.BaseUrl);
throw;
}
}
private TorrentRssIndexerParserSettings GetParserSettings(IndexerResponse response, TorrentRssIndexerSettings indexerSettings)
{
var settings = GetEzrssParserSettings(response, indexerSettings);
if (settings != null)
{
return settings;
}
settings = GetGenericTorrentRssParserSettings(response, indexerSettings);
if (settings != null)
{
return settings;
}
return null;
}
private TorrentRssIndexerParserSettings GetEzrssParserSettings(IndexerResponse response, TorrentRssIndexerSettings indexerSettings)
{
if (!IsEZTVFeed(response))
{
return null;
}
_logger.Trace("Feed has Ezrss schema");
var parser = new EzrssTorrentRssParser();
var releases = ParseResponse(parser, response);
try
{
ValidateReleases(releases, indexerSettings);
ValidateReleaseSize(releases, indexerSettings);
_logger.Debug("Feed was parseable by Ezrss Parser");
return new TorrentRssIndexerParserSettings
{
UseEZTVFormat = true
};
}
catch (Exception ex)
{
_logger.Trace(ex, "Feed wasn't parsable by Ezrss Parser");
return null;
}
}
private TorrentRssIndexerParserSettings GetGenericTorrentRssParserSettings(IndexerResponse response, TorrentRssIndexerSettings indexerSettings)
{
var parser = new TorrentRssParser
{
UseEnclosureUrl = true,
UseEnclosureLength = true,
ParseSeedersInDescription = true
};
var item = parser.GetItems(response).FirstOrDefault();
if (item == null)
{
throw new UnsupportedFeedException("Empty feed, cannot check if feed is parsable.");
}
var settings = new TorrentRssIndexerParserSettings()
{
UseEnclosureUrl = true,
UseEnclosureLength = true,
ParseSeedersInDescription = true
};
if (item.Element("enclosure") == null)
{
parser.UseEnclosureUrl = settings.UseEnclosureUrl = false;
}
var releases = ParseResponse(parser, response);
ValidateReleases(releases, indexerSettings);
if (!releases.Any(v => v.Seeders.HasValue))
{
_logger.Trace("Feed doesn't have Seeders in Description, disabling option.");
parser.ParseSeedersInDescription = settings.ParseSeedersInDescription = false;
}
if (!releases.Any(r => r.Size < ValidSizeThreshold))
{
_logger.Trace("Feed has valid size in enclosure.");
return settings;
}
parser.UseEnclosureLength = settings.UseEnclosureLength = false;
foreach (var sizeElementName in new[] { "size", "Size" })
{
parser.SizeElementName = settings.SizeElementName = sizeElementName;
releases = ParseResponse(parser, response);
ValidateReleases(releases, indexerSettings);
if (!releases.Any(r => r.Size < ValidSizeThreshold))
{
_logger.Trace("Feed has valid size in Size element.");
return settings;
}
}
parser.SizeElementName = settings.SizeElementName = null;
parser.ParseSizeInDescription = settings.ParseSizeInDescription = true;
releases = ParseResponse(parser, response);
ValidateReleases(releases, indexerSettings);
if (releases.Count(r => r.Size >= ValidSizeThreshold) > releases.Length / 2)
{
if (releases.Any(r => r.Size < ValidSizeThreshold))
{
_logger.Debug("Feed {0} contains very small releases.", response.Request.Url);
}
_logger.Trace("Feed has valid size in description.");
return settings;
}
parser.ParseSizeInDescription = settings.ParseSizeInDescription = false;
_logger.Debug("Feed doesn't have release size.");
releases = ParseResponse(parser, response);
ValidateReleases(releases, indexerSettings);
ValidateReleaseSize(releases, indexerSettings);
return settings;
}
private bool IsEZTVFeed(IndexerResponse response)
{
var content = XmlCleaner.ReplaceEntities(response.Content);
content = XmlCleaner.ReplaceUnicode(content);
using var xmlTextReader = XmlReader.Create(new StringReader(content), new XmlReaderSettings { DtdProcessing = DtdProcessing.Parse, ValidationType = ValidationType.None, IgnoreComments = true, XmlResolver = null });
var document = XDocument.Load(xmlTextReader);
// Check Namespace
if (document.Root == null)
{
throw new InvalidDataException("Could not parse IndexerResponse into XML.");
}
var ns = document.Root.GetNamespaceOfPrefix("torrent");
if (ns == "http://xmlns.ezrss.it/0.1/")
{
_logger.Trace("Identified feed as EZTV compatible by EZTV Namespace");
return true;
}
// Check DTD in DocType
if (document.DocumentType != null && document.DocumentType.SystemId == "http://xmlns.ezrss.it/0.1/dtd/")
{
_logger.Trace("Identified feed as EZTV compatible by EZTV DTD");
return true;
}
// Check namespaces
if (document.Descendants().Any(v => v.GetDefaultNamespace().NamespaceName == "http://xmlns.ezrss.it/0.1/"))
{
_logger.Trace("Identified feed as EZTV compatible by EZTV Namespace");
return true;
}
return false;
}
private TorrentInfo[] ParseResponse(IParseIndexerResponse parser, IndexerResponse response)
{
try
{
var releases = parser.ParseResponse(response).Cast<TorrentInfo>().ToArray();
return releases;
}
catch (Exception ex)
{
_logger.Debug(ex, "Unable to parse indexer feed: " + ex.Message);
throw new UnsupportedFeedException("Unable to parse indexer: " + ex.Message);
}
}
private void ValidateReleases(TorrentInfo[] releases, TorrentRssIndexerSettings indexerSettings)
{
if (releases == null || releases.Empty())
{
throw new UnsupportedFeedException("Empty feed, cannot check if feed is parsable.");
}
var torrentInfo = releases.First();
_logger.Trace("TorrentInfo: \n{0}", torrentInfo.ToString("L"));
if (releases.Any(r => r.Title.IsNullOrWhiteSpace()))
{
throw new UnsupportedFeedException("Feed contains releases without title.");
}
if (releases.Any(r => !IsValidDownloadUrl(r.DownloadUrl)))
{
throw new UnsupportedFeedException("Failed to find a valid download url in the feed.");
}
var total = releases.Where(v => v.Guid != null).Select(v => v.Guid).ToArray();
var distinct = total.Distinct().ToArray();
if (distinct.Length != total.Length)
{
throw new UnsupportedFeedException("Feed contains releases with same guid, rejecting malformed rss feed.");
}
}
private void ValidateReleaseSize(TorrentInfo[] releases, TorrentRssIndexerSettings indexerSettings)
{
if (!indexerSettings.AllowZeroSize && releases.Any(r => r.Size == 0))
{
throw new UnsupportedFeedException("Feed doesn't contain the release content size.");
}
if (releases.Any(r => r.Size != 0 && r.Size < ValidSizeThreshold))
{
throw new UnsupportedFeedException("Size of one or more releases lower than {0}, feed must contain release content size.", ValidSizeThreshold.SizeSuffix());
}
}
private static bool IsValidDownloadUrl(string url)
{
if (url.IsNullOrWhiteSpace())
{
return false;
}
return url.StartsWith("magnet:") || url.StartsWith("http:") || url.StartsWith("https:");
}
}
}