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public class CertificateExpireChecker
{
private TimeSpan TimeOut => TimeSpan.FromSeconds(5);
public string Url { get; }
public DateTime LimitDate => DateTime.Now;
public bool IsExists => Certificate != null;
public X509Certificate2 Certificate { get; private set; }
public string CommonName => Certificate?.SubjectName.Name.Split(',').FirstOrDefault(x => x.StartsWith("CN="));
public TimeSpan? DaysLeft => ExpiredDate - LimitDate;
public bool IsExpired => DateTime.Now > Certificate?.NotAfter;
public DateTime? ExpiredDate => Certificate?.NotAfter;
public string Issuer => Certificate?.Issuer;
public string Subject => Certificate?.Subject;
public string FriendlyName => Certificate?.FriendlyName;
public string ThumbPrint => Certificate?.Thumbprint;
public string SignatureAlgorithm => Certificate?.SignatureAlgorithm.FriendlyName;
public CertificateExpireChecker(string url)
{
Url = url;
}
public void ReadX509Certificate2()
{
var request = WebRequest.Create(Url) as HttpWebRequest;
request.Timeout = (int)TimeOut.TotalMilliseconds;
try
{
using (var response = request.GetResponse()) { }
}
catch (Exception)
{
return;
}
var cert2 = new X509Certificate2(request.ServicePoint.Certificate);
Certificate = cert2;
}
}
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