Radarr/NzbDrone.Core/Indexers/SyndicationFeedXmlReader.cs

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//http://stackoverflow.com/questions/210375/problems-reading-rss-with-c-and-net-3-5
//https://connect.microsoft.com/VisualStudio/feedback/details/325421/syndicationfeed-load-fails-to-parse-datetime-against-a-real-world-feeds-ie7-can-read
using System;
using System.Globalization;
using System.IO;
using System.Linq;
using System.Reflection;
using System.ServiceModel.Syndication;
using System.Threading;
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using System.Xml;
using NLog;
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namespace NzbDrone.Core.Indexers
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{
public class SyndicationFeedXmlReader : XmlTextReader
{
private static readonly Logger logger = LogManager.GetCurrentClassLogger();
private static readonly string[] rss20DateTimeHints = { "pubDate" };
private static readonly string[] atom10DateTimeHints = { "updated", "published", "lastBuildDate" };
private bool _isRss2DateTime;
private bool _isAtomDateTime;
private static readonly MethodInfo rss20FeedFormatterMethodInfo = typeof(Rss20FeedFormatter).GetMethod("DateFromString", BindingFlags.NonPublic | BindingFlags.Static);
private static readonly MethodInfo atom10FeedFormatterMethodInfo = typeof(Atom10FeedFormatter).GetMethod("DateFromString", BindingFlags.NonPublic | BindingFlags.Instance);
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public SyndicationFeedXmlReader(Stream stream) : base(stream) { }
public override bool IsStartElement(string localname, string ns)
{
_isRss2DateTime = rss20DateTimeHints.Contains(localname);
_isAtomDateTime = atom10DateTimeHints.Contains(localname);
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CheckForError();
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return base.IsStartElement(localname, ns);
}
public override string ReadString()
{
var dateVal = base.ReadString();
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try
{
if (_isRss2DateTime)
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{
rss20FeedFormatterMethodInfo.Invoke(null, new object[] { dateVal, this });
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}
if (_isAtomDateTime)
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{
atom10FeedFormatterMethodInfo.Invoke(new Atom10FeedFormatter(), new object[] { dateVal, this });
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}
}
catch (TargetInvocationException e)
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{
DateTime parsedDate;
if (!DateTime.TryParse(dateVal, new CultureInfo("en-US"), DateTimeStyles.None, out parsedDate))
{
parsedDate = DateTime.UtcNow;
logger.WarnException("Unable to parse Feed date " + dateVal, e);
}
var currentCulture = Thread.CurrentThread.CurrentCulture;
Thread.CurrentThread.CurrentCulture = new CultureInfo("en-US");
dateVal = parsedDate.ToString("ddd, dd MMM yyyy HH:mm:ss zzz");
dateVal = dateVal.Remove(dateVal.LastIndexOf(':'), 1);
Thread.CurrentThread.CurrentCulture = currentCulture;
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}
return dateVal;
}
private void CheckForError()
{
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if (MoveToContent() == XmlNodeType.Element)
{
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if (Name != "error")
return;
var message = "Error: ";
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if (HasAttributes)
{
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while (MoveToNextAttribute())
{
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message += String.Format(" [{0}:{1}]", Name, Value);
}
}
logger.Error("Error in RSS feed: {0}", message);
throw new Exception(message);
}
}
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}
}