/// <summary>
/// Returns the response to the NNTP request
/// </summary>
/// <param name="asyncRequest">Indicates whether this method is being called as part of
/// an async request. This tells us whether to use the Timeout value or not.</param>
/// <returns>The NNTP response</returns>
private WebResponse GetResponse(bool asyncRequest)
{
NntpWebResponse response;
MemoryStream newsgroupListStream;
//The stream is not closed on purpose in this method
StreamWriter sw;
using (NntpClient client = this.Connect())
{
if (!asyncRequest)
{
client.Timeout = this.Timeout;
}
switch (this.method)
{
case "POST":
requestStream.Position = 0;
client.Post(new UTF8Encoding().GetString(this.requestStream.ToArray()));
response = new NntpWebResponse(NntpStatusCode.OK, RequestUri);
break;
case "LIST":
newsgroupListStream = new MemoryStream();
sw = new StreamWriter(newsgroupListStream);
client.Groups(sw);
sw.Flush();
newsgroupListStream.Position = 0;
response = new NntpWebResponse(NntpStatusCode.OK, newsgroupListStream, RequestUri);
break;
case "NEWNEWS":
client.SelectGroup(requestUri.PathAndQuery.Substring(1));
IList <MimeMessage> msgs = client.GetNntpMessages(ifModifiedSince, downloadCount);
response = new NntpWebResponse(NntpStatusCode.OK, Stream.Null, RequestUri);
response.Articles = msgs;
break;
default:
throw new NotSupportedException(method);
}
}
return(response);
}
/// <summary>
/// Reads the list of articles from the stream and returns the feed item.
/// </summary>
/// <param name="f">Information about the feed. This information is updated based
/// on the results of processing the feed.</param>
/// <param name="newsgroupListStream">A stream containing an nntp news group list.</param>
/// <param name="response">The response.</param>
/// <param name="cacheDataService">The cache data service to store embedded binary content.</param>
/// <param name="cachedStream">Flag states update last retrieved date on feed only
/// if the item was not cached. Indicates whether the lastretrieved date is updated
/// on the NewsFeed object passed in.</param>
/// <returns>
/// A FeedInfo containing the NewsItem objects
/// </returns>
internal static FeedInfo GetItemsForNewsGroup(INewsFeed f, Stream newsgroupListStream, WebResponse response, IUserCacheDataService cacheDataService, bool cachedStream)
{
int readItems = 0;
List <INewsItem> items = new List <INewsItem>();
NewsItem item;
StringBuilder content = new StringBuilder();
#if DEBUG
// just to have the source for the item to build to track down issues:
StringBuilder itemSource = new StringBuilder();
#endif
NntpWebResponse nntpResponse = (NntpWebResponse)response;
FeedInfo fi = new FeedInfo(f.id, f.cacheurl, items, f.title, f.link, String.Empty);
try
{
foreach (MimeMessage msg in nntpResponse.Articles)
{
string parentId;
string id;
string author = parentId = id = null;
DateTime pubDate = DateTime.UtcNow;
content.Length = 0;
string title;
if (msg.Subject != null)
{
title = EscapeXML(msg.Subject.Value);
}
else
{
title = "";
}
UnstructuredField fld = msg.Header.GetField(MimeField.MessageID) as UnstructuredField;
if (fld != null)
{
id = fld.Value;
}
MailboxListField mfld = msg.Header.GetField(MimeField.From) as MailboxListField;
if (mfld != null && mfld.MailboxList.Count > 0)
{
author = mfld.MailboxList[0].AddressString;
}
fld = msg.Header.GetField(MimeField.References) as UnstructuredField;
if (fld != null)
{
// returns the hierarchy path: the last one is our real parent:
string[] singleRefs = fld.Value.Split(' ');
if (singleRefs.Length > 0)
{
parentId = CreateGoogleUrlFromID(singleRefs[singleRefs.Length - 1]);
}
}
DateTimeField dfld = msg.Header.GetField(MimeField.Date) as DateTimeField;
if (dfld != null)
{
pubDate = dfld.DateValue;
}
ITextBody txtBody = msg.Body as ITextBody;
if (txtBody != null)
{
content.Append(txtBody.Reader.ReadToEnd());
content = NntpClient.DecodeBody(content,
(fileName, bytes) =>
{
string name = PrepareEmbeddedFileUrl(fileName, id, nntpResponse.ResponseUri);
// we replace the uuencoded/yencoded binary content with a clickable link:
if (IsImage(fileName))
{
return(String.Format("<img src='{1}' alt='{0}'></img>", fileName,
cacheDataService.SaveBinaryContent(name, bytes).AbsoluteUri));
}
return(String.Format("<a href='{1}'>{0}</a>", fileName,
cacheDataService.SaveBinaryContent(name, bytes).AbsoluteUri));
},
line =>
{
// escape HTML/XML special chars:
return(line.Replace("<", "<").Replace("]]>", "]]>"));
});
content = content.Replace(Environment.NewLine, "<br>");
}
if (id != null)
{
item = new NewsItem(f, title, CreateGoogleUrlFromID(id), content.ToString(), author, pubDate, id, parentId);
item.FeedDetails = fi;
item.CommentStyle = SupportedCommentStyle.NNTP;
item.Enclosures = Collections.GetList <IEnclosure> .Empty;
items.Add(item);
FeedSource.ReceivingNewsChannelServices.ProcessItem(item);
}
else
{
#if DEBUG
_log.Warn("No message-id header found for item:\r\n" + itemSource.ToString());
#else
_log.Warn("No message-id header found for item.");
#endif
}
}
//update last retrieved date on feed only if the item was not cached.)
if (!cachedStream)
{
f.lastretrieved = new DateTime(DateTime.Now.Ticks);
f.lastretrievedSpecified = true;
}
//any new items in feed?
if ((items.Count == 0) || (readItems == items.Count))
{
f.containsNewMessages = false;
}
else
{
f.containsNewMessages = true;
}
FeedSource.ReceivingNewsChannelServices.ProcessItem(fi);
FeedSource.RelationCosmosAddRange(items);
fi.itemsList.AddRange(items);
}
catch (Exception e)
{
_log.Error("Retriving NNTP articles from " + nntpResponse.ResponseUri + " caused an exception", e);
}
return(fi);
}