/// <summary>
/// Try to extract the EditUri (RSD file URI) from the passed DOM
/// </summary>
/// <param name="weblogDOM"></param>
/// <returns></returns>
private static string ExtractEditUri(string homepageUrl, BlogServiceDetectorBase.HomepageDom weblogDOM)
{
HtmlAgilityPack.HtmlDocument htmlDoc = new HtmlAgilityPack.HtmlDocument();
htmlDoc.LoadHtml(weblogDOM.Body);
// // look in the first HEAD tag
// IHTMLElementCollection headElements = ((IHTMLDocument3)weblogDOM).getElementsByTagName( "HEAD" ) ;
//if ( headElements.length > 0 )
//{
// // get the first head element
// IHTMLElement2 firstHeadElement = (IHTMLElement2)headElements.item(0,0);
// look for link tags within the head
var linkNodes = htmlDoc.DocumentNode.Descendants("head")?.SingleOrDefault()?.Descendants("link");
if (linkNodes != null)
{
foreach (var element in linkNodes)
{
var linkElementRel = element.GetAttributeValue("rel", null);
if (linkElementRel != null)
{
if (linkElementRel.ToLowerInvariant() == "edituri")
{
var hrefValue = element.GetAttributeValue("href", null);
if (!string.IsNullOrWhiteSpace(hrefValue))
{
return(UrlHelper.UrlCombineIfRelative(homepageUrl, hrefValue));
}
}
}
// IHTMLLinkElement linkElement = element as IHTMLLinkElement ;
//if ( linkElement != null )
//{
// string linkRel = linkElement.rel ;
// if ( linkRel != null && (linkRel.ToUpperInvariant().Equals("EDITURI") ) )
// {
// return UrlHelper.UrlCombineIfRelative(homepageUrl, linkElement.href);
// }
//}
//}
}
}
// couldn't find one
return(null);
}
public static async Task <RsdServiceDescription> DetectFromWeblogAsync(string homepage, BlogServiceDetectorBase.HomepageDom weblogDOM)
{
try
{
// get the edit uri
string rsdFileUrl = ExtractEditUri(homepage, weblogDOM);
// do the detection
if (rsdFileUrl != null)
{
return(await DetectFromRsdUrl(rsdFileUrl));
}
else
{
return(null);
}
}
catch (Exception ex)
{
//Trace.Fail( "Unexpected error attempting to detect Blog service: " + ex.ToString() );
return(null);
}
}