AuthCommand.cs

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namespace System.Net.Mail;
 
internal static class AuthCommand
{
    internal static IAsyncResult BeginSend(SmtpConnection conn, string type, string message, AsyncCallback callback, object state)
    {
        PrepareCommand(conn, type, message);
        return ReadLinesCommand.BeginSend(conn, callback, state);
    }
 
    internal static IAsyncResult BeginSend(SmtpConnection conn, string message, AsyncCallback callback, object state)
    {
        PrepareCommand(conn, message);
        return ReadLinesCommand.BeginSend(conn, callback, state);
    }
 
    private static LineInfo CheckResponse(LineInfo[] lines)
    {
        if (lines == null || lines.Length == 0)
        {
            throw new SmtpException(System.SR.SmtpAuthResponseInvalid);
        }
        return lines[0];
    }
 
    internal static LineInfo EndSend(IAsyncResult result)
    {
        return CheckResponse(ReadLinesCommand.EndSend(result));
    }
 
    private static void PrepareCommand(SmtpConnection conn, string type, string message)
    {
        conn.BufferBuilder.Append(SmtpCommands.Auth);
        conn.BufferBuilder.Append(type);
        conn.BufferBuilder.Append(32);
        conn.BufferBuilder.Append(message);
        conn.BufferBuilder.Append(SmtpCommands.CRLF);
    }
 
    private static void PrepareCommand(SmtpConnection conn, string message)
    {
        conn.BufferBuilder.Append(message);
        conn.BufferBuilder.Append(SmtpCommands.CRLF);
    }
 
    internal static LineInfo Send(SmtpConnection conn, string type, string message)
    {
        PrepareCommand(conn, type, message);
        return CheckResponse(ReadLinesCommand.Send(conn));
    }
 
    internal static LineInfo Send(SmtpConnection conn, string message)
    {
        PrepareCommand(conn, message);
        return CheckResponse(ReadLinesCommand.Send(conn));
    }
}