public ReplacementPosition(ReplacementPosition copy)
{
Start = copy.Start;
Length = copy.Length;
}
public String MaskSecrets(String input)
{
if (String.IsNullOrEmpty(input))
{
return(String.Empty);
}
var secretPositions = new List <ReplacementPosition>();
// Read section.
try
{
m_lock.EnterReadLock();
// Get indexes and lengths of all substrings that will be replaced.
foreach (RegexSecret regexSecret in m_regexSecrets)
{
secretPositions.AddRange(regexSecret.GetPositions(input));
}
foreach (ValueSecret valueSecret in m_valueSecrets)
{
secretPositions.AddRange(valueSecret.GetPositions(input));
}
}
finally
{
if (m_lock.IsReadLockHeld)
{
m_lock.ExitReadLock();
}
}
// Short-circuit if nothing to replace.
if (secretPositions.Count == 0)
{
return(input);
}
// Merge positions into ranges of characters to replace.
List <ReplacementPosition> replacementPositions = new List <ReplacementPosition>();
ReplacementPosition currentReplacement = null;
foreach (ReplacementPosition secretPosition in secretPositions.OrderBy(x => x.Start))
{
if (currentReplacement == null)
{
currentReplacement = new ReplacementPosition(copy: secretPosition);
replacementPositions.Add(currentReplacement);
}
else
{
if (secretPosition.Start <= currentReplacement.End)
{
// Overlap
currentReplacement.Length = Math.Max(currentReplacement.End, secretPosition.End) - currentReplacement.Start;
}
else
{
// No overlap
currentReplacement = new ReplacementPosition(copy: secretPosition);
replacementPositions.Add(currentReplacement);
}
}
}
// Replace
var stringBuilder = new StringBuilder();
Int32 startIndex = 0;
foreach (var replacement in replacementPositions)
{
stringBuilder.Append(input.Substring(startIndex, replacement.Start - startIndex));
stringBuilder.Append("***");
startIndex = replacement.Start + replacement.Length;
}
if (startIndex < input.Length)
{
stringBuilder.Append(input.Substring(startIndex));
}
return(stringBuilder.ToString());
}