public Task <IDictionary <string, X509Certificate2> > GetCertificatesAsync(IssuerConfiguration issuerConfiguration)
{
lock (funcLock)
{
if (certRetrieveTask != null && certificateCacheExpires > clock.GetLocalTime())
{
return(certRetrieveTask);
}
// assume the cache is indefinite by default, and adjust back based on downloaded certificates.
certificateCacheExpires = DateTime.MaxValue;
certRetrieveTask = DoGetCertificateAsync(issuerConfiguration);
}
return(certRetrieveTask);
}