ITwoFactorCodeProvider implementation

ImapTwoFactorCodeProvider.cs

using AE.Net.Mail;
using System.Linq;
using System.Text.RegularExpressions;
using System.Threading.Tasks;
using UltimateTeam.Toolkit.Exceptions;
using UltimateTeam.Toolkit.Services;

namespace UltimateTeam.Toolkit.TwoFactorCodeProviders
{
    public class ImapTwoFactorCodeProvider : ITwoFactorCodeProvider
    {
        private readonly string _username;
        private readonly string _password;
        private readonly string _hostName;
        private readonly int _port;
        private readonly bool _useUseSsl;

        public ImapTwoFactorCodeProvider(string username, string password, string hostname, int port, bool useSsl)
        {
            _username = username;
            _password = password;
            _hostName = hostname;
            _port = port;
            _useUseSsl = useSsl;
        }

        public Task<string> GetTwoFactorCodeAsync()
        {
            return Task.Run(async () =>
            {
                var regex = new Regex(@"(?<=<strong>)\d{6}");

                using (var client = new ImapClient(_hostName, _username, _password, AuthMethods.Login, _port, _useUseSsl))
                {
                    for (var i = 0; i < 5; i++)
                    {
                        var messages = client.SearchMessages(SearchCondition.Unseen().And(SearchCondition.From("Origin")));
                        foreach (var match in messages.Select(message => regex.Match(message.Value.Body)).Where(match => match.Success))
                        {
                            return match.Value;
                        }
                        await Task.Delay(5000);
                    }
                }
                throw new FutException("Unable to find the two-factor authentication code.");
            });
        }
    }
}

Hostname: imap.gmail.com
Port: 993

return Task.Run(async () => ....

I have an error:: " it cannot resolve method Run(lambda expression) "
what to do here? Any idea?

Where should this .cs file go? my new project or toolkit project ?
thanks!

The file goes wherever you wish it to go. You are perhaps just trying to compile it under wrong framework.
I believe the complication of using an async lambda is not quite necessary in this particular case.
Since Task.Run(Action) puts the specified action to a threadpool, you do not quite need to make the lambda asynchronous.

I believe the following example should solve the obvious problems you might be facing right now.

return Task.Run(() =>
{
//whatever you are doing here is being executed in a worker thread acquired from the thread pool
//and this is how you pause your worker thread in this case:
Thread.Sleep(5000);
});

This should suffice, as I believe that losing a single thread from the thread pool for 25 seconds or less will not lead to anything nasty in this particular situation.

Thanks @hacklex!

Could you please give me an example using the above code on how i set the email as seen, or better yet delete it after retrieving the code?

Also, how would i go about using the newest email if i was too get more than one result for unseen & from origin?