public IList <XElement> GetNewValidEntries(FeedSyncProfilePart feedSyncProfilePart, string feedType)
{
var newEntries = new List <XElement>();
if (FeedType != feedType || string.IsNullOrEmpty(feedSyncProfilePart.FeedItemIdType))
{
return(newEntries);
}
try
{
var feedXml = XDocument.Load(feedSyncProfilePart.FeedUrl);
var channelElement = feedXml.Root.GetDescendantNodeByName("channel");
if (channelElement == null)
{
return(newEntries);
}
var feedItems = channelElement.Descendants("item");
if (feedItems == null)
{
return(newEntries);
}
foreach (var feedItem in feedItems)
{
// If this is the init and the init count is more than the set one.
if (!feedSyncProfilePart.SuccesfulInit &&
newEntries.Count() >= feedSyncProfilePart.NumberOfItemsToSyncDuringInit)
{
break;
}
var pubDateElement = feedItem.GetDescendantNodeByName("pubDate");
var idElement = feedItem.GetDescendantNodeByName(feedSyncProfilePart.FeedItemIdType);
var modificationDate = new DateTime();
if (pubDateElement == null ||
idElement == null ||
!DateTimeHelper.TryParseDateTime(pubDateElement.Value, out modificationDate))
{
continue;
}
if (modificationDate.ToUniversalTime() <= feedSyncProfilePart.LatestCreatedItemModificationDate)
{
break;
}
newEntries.Add(feedItem);
}
return(newEntries);
}
catch (Exception ex) when(ex is FileNotFoundException || ex is XmlException || ex is NotSupportedException)
{
Logger.Error(ex, "Cannot find or parse the feed with the given url.");
throw;
}
}
public IList <XElement> GetNewValidEntries(FeedSyncProfilePart feedSyncProfilePart, string feedType)
{
var newEntries = new List <XElement>();
if (FeedType != feedType || string.IsNullOrEmpty(feedSyncProfilePart.FeedItemIdType))
{
return(newEntries);
}
try
{
var feedXml = XDocument.Load(feedSyncProfilePart.FeedUrl);
var feedEntries = feedXml.Root.GetDescendantNodesByName("entry");
var i = 0;
while (feedEntries != null && i < feedEntries.Count())
{
// If this is the init and the init count is more than the set one.
if (!feedSyncProfilePart.SuccesfulInit &&
newEntries.Count() >= feedSyncProfilePart.NumberOfItemsToSyncDuringInit)
{
break;
}
var updatedElement = feedEntries.ElementAt(i).GetDescendantNodeByName("updated");
var idElement = feedEntries
.ElementAt(i)
.GetDescendantNodeByName(feedSyncProfilePart.FeedItemIdType);
var modificationDate = new DateTime();
if (updatedElement == null ||
idElement == null ||
!DateTimeHelper.TryParseDateTime(updatedElement.Value, out modificationDate))
{
i++;
continue;
}
if (modificationDate.ToUniversalTime() <= feedSyncProfilePart.LatestCreatedItemModificationDate)
{
break;
}
newEntries.Add(feedEntries.ElementAt(i));
i++;
// If this entry is the last one in this batch, then getting the next batch.
if (feedEntries.Count() == i)
{
// Getting the "next" element, it contains a link to the next feed page.
var nextAtomElement = feedXml
.Root
.Elements()
.FirstOrDefault(element =>
{
if (element.Name.LocalName != "link")
{
return(false);
}
var relAttribute = element.Attribute("rel");
if (relAttribute == null)
{
return(false);
}
return(relAttribute.Value == "next");
});
if (nextAtomElement == null)
{
break;
}
feedXml = XDocument.Load(nextAtomElement.Value);
feedEntries = feedXml.Root.GetDescendantNodesByName("entry");
i = 0;
}
}
return(newEntries);
}
catch (Exception ex) when(ex is FileNotFoundException || ex is XmlException || ex is NotSupportedException)
{
Logger.Error(ex, "Cannot find or parse the feed with the given url.");
throw;
}
}
public string GetValidFeedType(FeedSyncProfilePart feedSyncProfilePart)
{
try
{
var feedXml = XDocument.Load(feedSyncProfilePart.FeedUrl);
// Checking if the feed is valid RSS.
if (feedXml.Root.Name.LocalName == "rss")
{
var channelElement = feedXml.Root.GetDescendantNodeByName("channel");
if (channelElement == null)
{
Logger.Error("Feed is invalid. No channel element.");
return(null);
}
var firstItemElement = channelElement.GetDescendantNodeByName("item");
if (firstItemElement == null)
{
Logger.Error("Feed is invalid. No item element.");
return(null);
}
var pubDateElement = firstItemElement.GetDescendantNodeByName("pubDate");
if (pubDateElement == null)
{
Logger.Error("Feed is invalid. No pubDate element.");
return(null);
}
if (!firstItemElement
.Elements()
.Any(element =>
element.Name.LocalName == "guid" ||
element.Name.LocalName == "title" ||
element.Name.LocalName == "description"))
{
Logger.Error("Feed is invalid. No guid, title or description element.");
return(null);
}
// Since the feed is valid, set the id type.
else if (string.IsNullOrEmpty(feedSyncProfilePart.FeedItemIdType))
{
if (firstItemElement.ElementContainsNodeWithName("guid"))
{
feedSyncProfilePart.FeedItemIdType = "guid";
}
else if (firstItemElement.ElementContainsNodeWithName("title"))
{
feedSyncProfilePart.FeedItemIdType = "title";
}
else if (firstItemElement.ElementContainsNodeWithName("description"))
{
feedSyncProfilePart.FeedItemIdType = "description";
}
}
if (string.IsNullOrEmpty(feedSyncProfilePart.FeedItemModificationDateType))
{
feedSyncProfilePart.FeedItemModificationDateType = "pubDate";
}
return("Rss");
}
// Checking if the feed is valid Atom.
if (feedXml.Root.Name.LocalName == "feed")
{
var xmlnsAttribute = feedXml.Root.Attribute("xmlns");
if (xmlnsAttribute != null && xmlnsAttribute.Value == "http://www.w3.org/2005/Atom")
{
var firstEntryElement = feedXml.Root.GetDescendantNodeByName("entry");
if (firstEntryElement == null)
{
Logger.Error("Feed is invalid. No entry element.");
return(null);
}
var updatedElement = firstEntryElement.GetDescendantNodeByName("updated");
if (updatedElement == null)
{
Logger.Error("Feed is invalid. No updated element.");
return(null);
}
var idElement = firstEntryElement.GetDescendantNodeByName("id");
if (idElement == null)
{
Logger.Error("Feed is invalid. No id element.");
return(null);
}
// Since the feed is valid, set the id type.
else if (string.IsNullOrEmpty(feedSyncProfilePart.FeedItemIdType))
{
feedSyncProfilePart.FeedItemIdType = "id";
}
if (string.IsNullOrEmpty(feedSyncProfilePart.FeedItemModificationDateType))
{
feedSyncProfilePart.FeedItemModificationDateType = "updated";
}
return("Atom");
}
}
}
catch (Exception ex) when(ex is FileNotFoundException || ex is XmlException || ex is NotSupportedException)
{
Logger.Error(ex, "Cannot find or parse the feed with the given url.");
return(null);
}
Logger.Error("Cannot get the feed type, so it's unsupported.");
return(null);
}
