EHelloCommand.cs

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namespace System.Net.Mail;
 
internal static class EHelloCommand
{
    internal static IAsyncResult BeginSend(SmtpConnection conn, string domain, AsyncCallback callback, object state)
    {
        PrepareCommand(conn, domain);
        return ReadLinesCommand.BeginSend(conn, callback, state);
    }
 
    private static string[] CheckResponse(LineInfo[] lines)
    {
        if (lines == null || lines.Length == 0)
        {
            throw new SmtpException(System.SR.SmtpEhloResponseInvalid);
        }
        if (lines[0].StatusCode != SmtpStatusCode.Ok)
        {
            if (lines[0].StatusCode < (SmtpStatusCode)400)
            {
                throw new SmtpException(System.SR.net_webstatus_ServerProtocolViolation, lines[0].Line);
            }
            throw new SmtpException(lines[0].StatusCode, lines[0].Line, serverResponse: true);
        }
        string[] array = new string[lines.Length - 1];
        for (int i = 1; i < lines.Length; i++)
        {
            array[i - 1] = lines[i].Line;
        }
        return array;
    }
 
    internal static string[] EndSend(IAsyncResult result)
    {
        return CheckResponse(ReadLinesCommand.EndSend(result));
    }
 
    private static void PrepareCommand(SmtpConnection conn, string domain)
    {
        if (conn.IsStreamOpen)
        {
            throw new InvalidOperationException(System.SR.SmtpDataStreamOpen);
        }
        conn.BufferBuilder.Append(SmtpCommands.EHello);
        conn.BufferBuilder.Append(domain);
        conn.BufferBuilder.Append(SmtpCommands.CRLF);
    }
 
    internal static string[] Send(SmtpConnection conn, string domain)
    {
        PrepareCommand(conn, domain);
        return CheckResponse(ReadLinesCommand.Send(conn));
    }
}