private Task <IFtpResponse> HandleAdatAsync(string argument, CancellationToken cancellationToken)
{
if (_filteredAuthenticationMechanism is null)
{
return(Task.FromResult <IFtpResponse>(new FtpResponse(503, T("Bad sequence of commands"))));
}
byte[] data;
if (string.IsNullOrWhiteSpace(argument))
{
data = new byte[0];
}
else
{
try
{
data = Convert.FromBase64String(argument);
}
catch (FormatException)
{
return(Task.FromResult <IFtpResponse>(new FtpResponse(501, T("Syntax error in parameters or arguments."))));
}
}
return(_filteredAuthenticationMechanism.HandleAdatAsync(data, cancellationToken));
}
