/// <summary>
/// Pass in a valid Base-32 encoded TOTP-Secret; receive a valid 2FA token.<para> </para>
/// If the token would be closer than 2 seconds to expiry, the method waits for a fresh one to avoid authentication failures due to latency.
/// </summary>
/// <param name="totpSecret">The Base-32 encoded secret to use for TOTP generation. If this is <c>null</c> or empty, <c>null</c> is returned.</param>
/// <returns>The 6-cipher string containing the TOTP; <c>null</c> if generation failed for some reason (e.g. invalid <paramref name="totpSecret"/> parameter).</returns>
public async Task <string> GetTotp(string totpSecret)
{
if (totpSecret.NullOrEmpty())
{
return(null);
}
try
{
var totp = new OtpNet.Totp(Base32Encoding.ToBytes(totpSecret));
if (totp.RemainingSeconds() < 2)
{
await Task.Delay(1250);
}
return(totp.ComputeTotp());
}
catch (Exception)
{
return(null);
}
}
public string Compute()
{
return(_totp.ComputeTotp());
}
