/// <summary>
/// Crawls a page.
/// </summary>
/// <param name="url">The url to crawl.</param>
private void CrawlPage( string url )
{
if ( !PageHasBeenCrawled( url ) && _robot.IsPathAllowed( _userAgent, url ) )
{
string rawPage = GetWebText( url );
if ( !string.IsNullOrWhiteSpace( rawPage ) )
{
var htmlDoc = new HtmlDocument();
htmlDoc.LoadHtml( rawPage );
// get page title
CrawledPage page = new CrawledPage();
if ( htmlDoc.DocumentNode.SelectSingleNode( "//body" ) != null )
{
page.Text = GetPageText( htmlDoc );// htmlDoc.DocumentNode.SelectSingleNode( "//body" ).InnerHtml;
}
else
{
page.Text = rawPage;
}
if ( htmlDoc.DocumentNode.SelectSingleNode( "//head/title" ) != null)
{
page.Title = htmlDoc.DocumentNode.SelectSingleNode( "//head/title" ).InnerText.Trim();
}
else
{
page.Title = url;
}
page.Url = url;
// set whether that page should in indexed
HtmlNode metaRobot = htmlDoc.DocumentNode.SelectSingleNode( "//meta[@name='robot']" );
if ( metaRobot != null && metaRobot.Attributes["content"] != null && metaRobot.Attributes["content"].Value.Contains( "noindex" ) )
{
page.AllowsIndex = false;
}
_pages.Add( page );
// index the page
// clean up the page title a bit by removing the site name off it
if ( page.AllowsIndex )
{
SitePageIndex sitePage = new SitePageIndex();
sitePage.Id = page.Url.MakeInt64HashCode();
sitePage.Content = page.Text.SanitizeHtml();
// store only the page title (strip the site name off per Rock convention)
if ( page.Title.Contains( "|" ) )
{
sitePage.PageTitle = page.Title.Substring( 0, (page.Title.IndexOf( '|' ) - 1) ).Trim();
}
else
{
sitePage.PageTitle = page.Title.Trim();
}
sitePage.DocumentName = sitePage.PageTitle;
sitePage.SiteName = _site.Name;
sitePage.SiteId = _site.Id;
sitePage.Url = page.Url;
sitePage.LastIndexedDateTime = RockDateTime.Now;
HtmlNode metaDescription = htmlDoc.DocumentNode.SelectSingleNode( "//meta[@name='description']" );
if ( metaDescription != null && metaDescription.Attributes["content"] != null )
{
sitePage.PageSummary = metaDescription.Attributes["content"].Value;
}
HtmlNode metaKeynotes = htmlDoc.DocumentNode.SelectSingleNode( "//meta[@name='keywords']" );
if ( metaKeynotes != null && metaKeynotes.Attributes["content"] != null )
{
sitePage.PageKeywords = metaKeynotes.Attributes["content"].Value;
}
IndexContainer.IndexDocument( sitePage );
}
LinkParser linkParser = new LinkParser();
linkParser.ParseLinks( htmlDoc, url, _startUrl );
//Add data to main data lists
AddRangeButNoDuplicates( _externalUrls, linkParser.ExternalUrls );
AddRangeButNoDuplicates( _otherUrls, linkParser.OtherUrls );
AddRangeButNoDuplicates( _failedUrls, linkParser.BadUrls );
foreach ( string exception in linkParser.Exceptions )
_exceptions.Add( exception );
//Crawl all the links found on the page.
foreach ( string link in linkParser.GoodUrls )
{
CrawlPage( link );
}
}
}
}
/// <summary>
/// This method will be called each time a page is found by the crawler.
/// </summary>
/// <param name="page">The page.</param>
/// <returns></returns>
public bool PageCallback( CrawledPage page)
{
if ( page.AllowsIndex )
{
// clean up the page title a bit by removing the site name off it
var pageTitle = page.Title.Substring( 0, (page.Title.IndexOf( '|' ) - 1) ).Trim();
SitePageIndex sitePage = new SitePageIndex();
sitePage.Id = page.Url.MakeInt64HashCode();
sitePage.Content = page.Text;
sitePage.PageTitle = pageTitle;
sitePage.SiteName = _site.Name;
sitePage.SiteId = _site.Id;
sitePage.Url = page.Url;
sitePage.LastIndexedDateTime = RockDateTime.Now;
IndexContainer.IndexDocument( sitePage );
_indexedPageCount++;
return true;
}
return false;
}
