private async void Fetch(string url, OnFeedFetchedHandler onFeedFetched, bool externalCall)
{
if (externalCall && _busy)
{
return;
}
_busy = true;
_url = url;
_canceled = false;
_onFeedFetched = onFeedFetched;
var client = new System.Net.Http.HttpClient(new System.Net.Http.HttpClientHandler()
{
AllowAutoRedirect = true
});
try
{
var content = await client.GetStringAsync(_url);
if (_canceled)
{
return;
}
try
{
XmlDocument doc = new XmlDocument();
doc.LoadXml(content);
if (_onFeedFetched != null)
{
_onFeedFetched(FeedRefreshResult.Success, doc, null, _url);
return;
}
}
catch (XmlException)
{
// maybe its non-xml html with a link to a feed..
try
{
MatchCollection matches = _altLinkRgx.Matches(content);
foreach (Match match in matches)
{
string linkContent = match.Groups[1].Value;
if (linkContent.Contains("type=\"application/rss+xml\""))
{
Match urlMatch = _altLinkURLRgx.Match(linkContent);
if (urlMatch.Success)
{
if (_onFeedFetched != null)
{
string redirectUrl = urlMatch.Groups[1].Value;
Fetch(redirectUrl, _onFeedFetched, false);
return;
}
}
}
}
if (_onFeedFetched != null)
{
_onFeedFetched(FeedRefreshResult.InvalidData, null, "Cannot connect to podcast, the resource does not appear to contain a podcast.", null);
return;
}
}
catch (Exception ex)
{
if (_onFeedFetched != null)
{
_onFeedFetched(FeedRefreshResult.UnableToConnect, null, "Cannot connect to podcast, " + ex.Message, null);
return;
}
}
}
}
catch (WebException ex)
{
if (ex.Message == "The request was aborted: The request was canceled.")
{
if (_onFeedFetched != null)
{
_onFeedFetched(FeedRefreshResult.Canceled, null, null, null);
return;
}
}
else
{
if (_onFeedFetched != null)
{
_onFeedFetched(FeedRefreshResult.UnableToConnect, null, ex.Message, null);
return;
}
}
}
catch (Exception ex)
{
if (_onFeedFetched != null)
{
_onFeedFetched(FeedRefreshResult.UnableToConnect, null, ex.Message, null);
return;
}
}
finally
{
_busy = false;
}
}
public void FetchIfNotBusy(string url, OnFeedFetchedHandler onFeedFetched)
{
Fetch(url, onFeedFetched, true);
}