internal static void ParseCSS_(TextualDataResource tdr, HashSet <string> resourceUrls, Logger logger)
{
logger.Verbose("enter. Parsing CSS from {0}", tdr.Uri);
Parser parser = new Parser();
StyleSheet stylesheet = parser.Parse(tdr.Data);
CollectAllImportUris_(stylesheet, resourceUrls, tdr.Uri, logger);
CollectAllFontFaceUris_(stylesheet, resourceUrls, tdr.Uri, logger);
CollectAllBackgroundImageUris_(stylesheet, resourceUrls, tdr.Uri, logger);
logger.Verbose("exit");
}
internal static TextualDataResource TryGetTextualData_(RGridResource blob, Uri baseUrl, Logger logger)
{
byte[] contentBytes = blob.Content;
string contentTypeStr = blob.ContentType;
logger.Verbose("enter - content length: {0} ; content type: {1}", contentBytes?.Length.ToString() ?? "<null>", contentTypeStr);
if (contentTypeStr == null)
{
return(null);
}
if (contentBytes.Length == 0)
{
return(null);
}
string[] parts = contentTypeStr.Split(';');
TextualDataResource tdr = new TextualDataResource();
if (parts.Length > 0)
{
tdr.MimeType = parts[0].ToLowerInvariant();
}
string charset = "UTF-8";
if (parts.Length > 1)
{
string[] keyVal = parts[1].Split('=');
string key = keyVal[0].Trim();
string val = keyVal[1].Trim().Trim('"');
if (key.Equals("charset", StringComparison.OrdinalIgnoreCase))
{
charset = val.ToUpper();
}
}
if (charset != null)
{
tdr.Data = Encoding.GetEncoding(charset).GetString(contentBytes);
}
tdr.Uri = blob.Url;
if (!tdr.Uri.IsAbsoluteUri)
{
tdr.Uri = new Uri(baseUrl, tdr.Uri);
}
tdr.OriginalData = blob.Content;
logger.Verbose("exit");
return(tdr);
}
internal static void ParseSVG_(TextualDataResource tdr, HashSet <string> allResourceUris, Logger logger)
{
HtmlDocument svgDoc = new HtmlDocument();
svgDoc.Load(new MemoryStream(tdr.OriginalData));
IEnumerable <HtmlNode> nodes = svgDoc.DocumentNode.Descendants().Where(n => n.HasAttributes);
foreach (HtmlNode node in nodes)
{
foreach (HtmlAttribute attr in node.Attributes)
{
if (attr.Name.Equals("xlink:href", StringComparison.OrdinalIgnoreCase) || attr.Name.Equals("href", StringComparison.OrdinalIgnoreCase))
{
string uri = attr.Value;
CreateUriAndAddToList(allResourceUris, tdr.Uri, uri, logger);
}
}
}
}
private void GetAndParseResource_(RGridResource blob, Uri baseUrl, HashSet <string> resourceUrls)
{
try
{
TextualDataResource tdr = TryGetTextualData_(blob, baseUrl, logger_);
switch (tdr?.MimeType)
{
case "text/css": ParseCSS_(tdr, resourceUrls, logger_); break;
case "image/svg+xml": ParseSVG_(tdr, resourceUrls, logger_); break;
}
}
catch (Exception ex)
{
logger_.Log("Error: " + ex);
logger_.Log("File name: " + blob.Url);
debugResourceWriter_.Write(blob);
}
}
