public string MaskByElementName(string xml, Predicate <string> elementNameSelector, MaskValue maskValue = null)
{
if (string.IsNullOrEmpty(xml))
{
throw new ArgumentException("xml must be not empty.", nameof(xml));
}
if (elementNameSelector is null)
{
throw new ArgumentNullException(nameof(elementNameSelector));
}
maskValue = maskValue ?? MaskingStrategies.Full;
var chars = CharArrayPool.Rent(xml.Length);
xml.CopyTo(0, chars, 0, xml.Length);
var cursor = new TextCursor(chars);
using (var xmlTextReader = XmlReader.Create(new StringReader(xml), _xmlReaderSettings))
while (xmlTextReader.Read())
{
if (xmlTextReader.NodeType == XmlNodeType.Element && elementNameSelector(xmlTextReader.LocalName))
{
ReadAndMask((IXmlLineInfo)xmlTextReader, chars, maskValue, ref cursor);
}
}
var maskedJson = new string(chars, 0, xml.Length);
CharArrayPool.Return(chars);
return(maskedJson);
}
public string MaskByXPath(string xml, string xPathSelector, MaskValue maskValue = null)
{
if (string.IsNullOrEmpty(xml))
{
throw new ArgumentException("xml must be not empty.", nameof(xml));
}
if (string.IsNullOrEmpty(xPathSelector))
{
throw new ArgumentNullException(nameof(xPathSelector));
}
var chars = CharArrayPool.Rent(xml.Length);
xml.CopyTo(0, chars, 0, xml.Length);
var cursor = new TextCursor(chars);
using (var xmlTextReader = XmlReader.Create(new StringReader(xml), _xmlReaderSettings))
{
var document = new XPathDocument(xmlTextReader);
foreach (XPathNavigator node in document.CreateNavigator().Select(xPathSelector))
{
if (node.IsNode)
{
ReadAndMask((IXmlLineInfo)node, chars, maskValue ?? MaskingStrategies.Full, ref cursor);
}
}
}
var maskedJson = new string(chars, 0, xml.Length);
CharArrayPool.Return(chars);
return(maskedJson);
}
internal static void ReadAndMask(IXmlLineInfo info, char[] chars, MaskValue maskValue, ref TextCursor cursor)
{
cursor.GoTo(info.LineNumber, info.LinePosition);
cursor.FindSymbol('>');
var cursorAtStartPosition = cursor;
var startPosition = cursor.Position + 1;
cursor.FindSymbol('<');
var endPosition = cursor.Position - 1;
if (cursor.LineNumber == info.LineNumber)
{
maskValue(chars.AsSpan(startPosition, endPosition - startPosition + 1));
}
else
{
cursor = cursorAtStartPosition;
cursor.GoToNextSymbol();
while (cursor.Position <= endPosition)
{
cursor.GoToNotWhiteSpaceSymbol();
var valueStartPosition = cursor.Position;
if (valueStartPosition >= endPosition)
{
return;
}
cursor.GoToLastLineSymbol();
var valueEndPosition = cursor.Position - 1;
maskValue(chars.AsSpan(valueStartPosition, valueEndPosition - valueStartPosition + 1));
}
}
return;
}
