issue58.cs

using System;
using System.IO;
using System.Net;
using System.Linq;
using System.Text;
using System.Threading;
using System.Security.Cryptography;

using MailKit.Net.Imap;
using MailKit.Net.Pop3;
using MailKit;
using MimeKit;

namespace TestClient {
	class Program
	{
		public static void Main (string[] args)
		{
			string userName = "username@gmail.com";
			string password = "password";
			
			UploadMessages (userName, password, "issue58.msg");
			DownloadMessages (userName, password);
		}

		static void UploadMessages (string userName, string password, string fileName)
		{
			using (var client = new ImapClient ()) {
				var credentials = new NetworkCredential (userName, password);
				var uri = new Uri ("imaps://imap.gmail.com");
				
				client.Connect (uri);
				
				client.AuthenticationMechanisms.Remove ("XOAUTH2");
				
				client.Authenticate (credentials);
				
				client.Inbox.Open (FolderAccess.ReadWrite);
				
				var message = MimeMessage.Load (fileName);
				for (int i = 0; i < 10; i++) {
					message.MessageId = MimeKit.Utils.MimeUtils.GenerateMessageId ();
					client.Inbox.Append (message, MessageFlags.Seen, message.Date);
				}
				
				client.Disconnect (true);
			}
		}

		static void DownloadMessages (string userName, string password)
		{
			using (var client = new Pop3Client (new ProtocolLogger ("gmail-pop3.log"))) {
				var credentials = new NetworkCredential (userName, password);
				var uri = new Uri ("pops://pop.gmail.com:995");
				
				client.Connect (uri);
				
				client.AuthenticationMechanisms.Remove ("XOAUTH2");
				
				client.Authenticate (credentials);
				
				int count = client.GetMessageCount ();
				for (int i = 0; i < count; i++) {
					var message = client.GetMessage (i);
					
					using (var jpeg = new MemoryStream ()) {
						var attachment = message.Attachments.FirstOrDefault ();
						
						attachment.ContentObject.DecodeTo (jpeg);
						jpeg.Position = 0;
						
						using (var md5 = new MD5CryptoServiceProvider ()) {
							var md5sum = HexEncode (md5.ComputeHash (jpeg));
							
							if (md5sum == "5b1b8b2c9300c9cd01099f44e1155e2b")
								Console.WriteLine ("MD5 checksums match!");
							else
								Console.WriteLine ("MD5 checksums do not match.");
						}
					}
					
					client.DeleteMessage (i);
				}
				
				client.Disconnect (true);
			}
		}

		static string HexEncode (byte[] digest)
		{
			var hex = new StringBuilder ();

			for (int i = 0; i < digest.Length; i++)
				hex.Append (digest[i].ToString ("x2"));

			return hex.ToString ();
		}
	}
}