StartTlsCommand.cs

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namespace System.Net.Mail;
 
internal static class StartTlsCommand
{
    internal static IAsyncResult BeginSend(SmtpConnection conn, AsyncCallback callback, object state)
    {
        PrepareCommand(conn);
        return CheckCommand.BeginSend(conn, callback, state);
    }
 
    private static void CheckResponse(SmtpStatusCode statusCode, string response)
    {
        if (statusCode != SmtpStatusCode.ServiceReady)
        {
            if (statusCode != SmtpStatusCode.ClientNotPermitted)
            {
            }
            if (statusCode < (SmtpStatusCode)400)
            {
                throw new SmtpException(System.SR.net_webstatus_ServerProtocolViolation, response);
            }
            throw new SmtpException(statusCode, response, serverResponse: true);
        }
    }
 
    internal static void EndSend(IAsyncResult result)
    {
        string response;
        SmtpStatusCode statusCode = (SmtpStatusCode)CheckCommand.EndSend(result, out response);
        CheckResponse(statusCode, response);
    }
 
    private static void PrepareCommand(SmtpConnection conn)
    {
        if (conn.IsStreamOpen)
        {
            throw new InvalidOperationException(System.SR.SmtpDataStreamOpen);
        }
        conn.BufferBuilder.Append(SmtpCommands.StartTls);
        conn.BufferBuilder.Append(SmtpCommands.CRLF);
    }
 
    internal static void Send(SmtpConnection conn)
    {
        PrepareCommand(conn);
        string response;
        SmtpStatusCode statusCode = CheckCommand.Send(conn, out response);
        CheckResponse(statusCode, response);
    }
}