public static List <HtmlUri> Extract(string html, Uri root)
{
HtmlUriExtractor ex = new HtmlUriExtractor(html, root);
while (!ex.EOF)
{
ex.Read();
}
return(ex.Uris);
}
protected override bool OnAttributeFound(ref string name, ref string value)
{
switch (name.ToLower())
{
case "src":
case "href":
if (BaseHref != null)
{
value = HtmlUriExtractor.TryCreate(BaseHref, value);
}
break;
}
return(base.OnAttributeFound(ref name, ref value));
}
/// <summary>
/// This method is overriden to filter out attributes which are not allowed
/// </summary>
public override void WriteAttributes(XmlReader reader, bool defattr)
{
if (Options.FilterOutput)
{
// The following code is copied from implementation of XmlWriter's
// WriteAttributes method.
if (reader == null)
{
throw new ArgumentNullException("reader");
}
if ((reader.NodeType == XmlNodeType.Element) || (reader.NodeType == XmlNodeType.XmlDeclaration))
{
if (reader.MoveToFirstAttribute())
{
WriteAttributes(reader, defattr);
reader.MoveToElement();
}
}
else
{
if (reader.NodeType != XmlNodeType.Attribute)
{
throw new XmlException("Xml_InvalidPosition");
}
do
{
if (defattr || !reader.IsDefault)
{
string attributename = reader.LocalName.ToLower();
// Check if the attribute is allowed
bool canWrite = true;
switch (LastStartElement)
{
case "embed":
canWrite = true;
break;
case "img":
if (Options.RewriteImgSize.HasValue &&
Options.RewriteImgSize.Value.Width <= 0 &&
Options.RewriteImgSize.Value.Height <= 0 &&
(attributename == "width" || attributename == "height"))
{
canWrite = false;
}
break;
default:
canWrite = (Array.IndexOf(Options.AllowedAttributes, attributename) >= 0);
break;
}
// If allowed, write the attribute
if (canWrite)
{
WriteStartAttribute(reader.Prefix, reader.LocalName, reader.NamespaceURI);
}
while (reader.ReadAttributeValue())
{
if (reader.NodeType == XmlNodeType.EntityReference)
{
if (canWrite)
{
WriteEntityRef(reader.Name);
}
continue;
}
if (canWrite)
{
string value = reader.Value;
if (Options.BaseHref != null && LastStartElement == "a" && attributename == "href")
{
value = HtmlUriExtractor.TryCreate(Options.BaseHref, reader.Value, value);
}
if (Options.RewriteHref != null && LastStartElement == "a" && attributename == "href")
{
value = string.Format("{0}&Url={1}", Options.RewriteHref.OriginalString,
Renderer.UrlEncode(value));
}
if (Options.BaseHref != null &&
(LastStartElement == "img" || LastStartElement == "embed") &&
attributename == "src")
{
value = HtmlUriExtractor.TryCreate(
Options.BaseHref, reader.Value, value);
}
if (Options.RewriteImgSrc != null &&
LastStartElement == "img" &&
attributename == "src")
{
value = Options.RewriteImgSrc.ToString().Replace("{url}",
Renderer.UrlEncode(value));
}
else if (Options.RewriteImgSize.HasValue &&
LastStartElement == "img" &&
attributename == "width")
{
value = Options.RewriteImgSize.Value.Width.ToString();
}
else if (Options.RewriteImgSize.HasValue &&
LastStartElement == "img" &&
attributename == "height")
{
value = Options.RewriteImgSize.Value.Height.ToString();
}
if (LastStartElement == "link" &&
attributename == "rel")
{
switch (value.ToLower())
{
case "stylesheet":
value = "stylesheet-stripped";
break;
}
}
WriteString(value);
}
}
if (canWrite)
{
WriteEndAttribute();
}
}
} while (reader.MoveToNextAttribute());
}
}
else
{
base.WriteAttributes(reader, defattr);
}
}
public override void WriteAttributes(XmlReader reader, bool defattr)
{
if (reader == null)
{
throw new ArgumentNullException("reader");
}
if ((reader.NodeType == XmlNodeType.Element) || (reader.NodeType == XmlNodeType.XmlDeclaration))
{
if (reader.MoveToFirstAttribute())
{
this.WriteAttributes(reader, defattr);
reader.MoveToElement();
}
}
else
{
if (reader.NodeType != XmlNodeType.Attribute)
{
throw new XmlException("Xml_InvalidPosition");
}
do
{
if (defattr || !reader.IsDefault)
{
string attributename = reader.LocalName.ToLower();
this.WriteStartAttribute(reader.Prefix, reader.LocalName, reader.NamespaceURI);
while (reader.ReadAttributeValue())
{
if (reader.NodeType == XmlNodeType.EntityReference)
{
this.WriteEntityRef(reader.Name);
continue;
}
string value = reader.Value;
if (BaseHref != null &&
LastStartElement == "a" &&
attributename == "href")
{
value = HtmlUriExtractor.TryCreate(
BaseHref, reader.Value, value);
}
if (BaseHref != null &&
(LastStartElement == "img" || LastStartElement == "embed") &&
attributename == "src")
{
value = HtmlUriExtractor.TryCreate(
BaseHref, reader.Value, value);
}
this.WriteString(value);
}
this.WriteEndAttribute();
}
} while (reader.MoveToNextAttribute());
}
}
public static List<HtmlUri> Extract(string html, Uri root)
{
HtmlUriExtractor ex = new HtmlUriExtractor(html, root);
while (!ex.EOF) ex.Read();
return ex.Uris;
}
