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