SmtpLoginAuthenticationModule.cs

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using System.Collections.Generic;
using System.Security.Authentication.ExtendedProtection;
using System.Text;
 
namespace System.Net.Mail;
 
internal sealed class SmtpLoginAuthenticationModule : ISmtpAuthenticationModule
{
    private readonly Dictionary<object, NetworkCredential> _sessions = new Dictionary<object, NetworkCredential>();
 
    public string AuthenticationType => "login";
 
    internal SmtpLoginAuthenticationModule()
    {
    }
 
    public Authorization Authenticate(string challenge, NetworkCredential credential, object sessionCookie, string spn, ChannelBinding channelBindingToken)
    {
        lock (_sessions)
        {
            if (!_sessions.TryGetValue(sessionCookie, out var value))
            {
                if (credential == null || credential == CredentialCache.DefaultNetworkCredentials)
                {
                    return null;
                }
                _sessions[sessionCookie] = credential;
                string text = credential.UserName;
                string domain = credential.Domain;
                if (domain != null && domain.Length > 0)
                {
                    text = domain + "\\" + text;
                }
                return new Authorization(Convert.ToBase64String(Encoding.UTF8.GetBytes(text)), finished: false);
            }
            _sessions.Remove(sessionCookie);
            return new Authorization(Convert.ToBase64String(Encoding.UTF8.GetBytes(value.Password)), finished: true);
        }
    }
 
    public void CloseContext(object sessionCookie)
    {
    }
}