RaspberryIO_26/Swan/Net/Smtp/SmtpSender.cs

using Swan.Logging;
using System;
using System.Linq;
using System.Net.Mail;

namespace Swan.Net.Smtp {
  /// <summary>
  /// Use this class to store the sender session data.
  /// </summary>
  internal class SmtpSender {
    private readonly String _sessionId;
    private String _requestText;

    public SmtpSender(String sessionId) => this._sessionId = sessionId;

    public String RequestText {
      get => this._requestText;
      set {
        this._requestText = value;
        $"  TX {this._requestText}".Trace(typeof(SmtpClient), this._sessionId);
      }
    }

    public String ReplyText {
      get; set;
    }

    public Boolean IsReplyOk => this.ReplyText.StartsWith("250 ", StringComparison.OrdinalIgnoreCase);

    public void ValidateReply() {
      if(this.ReplyText == null) {
        throw new SmtpException("There was no response from the server");
      }

      try {
        SmtpServerReply response = SmtpServerReply.Parse(this.ReplyText);
        $"  RX {this.ReplyText} - {response.IsPositive}".Trace(typeof(SmtpClient), this._sessionId);

        if(response.IsPositive) {
          return;
        }

        String responseContent = response.Content.Any() ? String.Join(";", response.Content.ToArray()) : String.Empty;

        throw new SmtpException((SmtpStatusCode)response.ReplyCode, responseContent);
      } catch(Exception ex) {
        if(!(ex is SmtpException)) {
          throw new SmtpException($"Could not parse server response: {this.ReplyText}");
        }
      }
    }
  }
}