private static HashSet <string> GetSearchableCertificates(IEnumerable <string> certificateFqdns)
{
HashSet <string> hashSet = new HashSet <string>();
if (certificateFqdns != null && certificateFqdns.Any <string>())
{
foreach (string text in certificateFqdns)
{
if (!string.IsNullOrWhiteSpace(text))
{
if (!hashSet.Contains(text))
{
hashSet.Add(text);
}
string text2 = string.Empty;
string text3 = string.Empty;
SmtpX509Identifier smtpX509Identifier;
SmtpDomain smtpDomain;
if (SmtpX509Identifier.TryParse(text, out smtpX509Identifier))
{
if (smtpX509Identifier != null && smtpX509Identifier.SubjectCommonName != null && smtpX509Identifier.SubjectCommonName.SmtpDomain != null)
{
text2 = smtpX509Identifier.SubjectCommonName.SmtpDomain.Domain;
}
}
else if (SmtpDomain.TryParse(text, out smtpDomain) && smtpDomain != null)
{
text2 = smtpDomain.Domain;
}
if (!string.IsNullOrWhiteSpace(text2))
{
int num = -1;
do
{
num = text2.IndexOf('.', num + 1);
if (num != -1)
{
if (!string.IsNullOrWhiteSpace(text3))
{
string item = "*." + text3;
if (!hashSet.Contains(item))
{
hashSet.Add(item);
}
}
text3 = text2.Substring(num + 1);
}
}while (num != -1);
}
}
}
}
return(hashSet);
}