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using DWSIM.Simulate365.Enums;
using DWSIM.Simulate365.Models;
using DWSIM.UI.Web;
using Microsoft.Win32;
using Newtonsoft.Json;
using System;
using System.Collections.Generic;
using System.IO;
using System.Linq;
using System.Net.Http;
using System.Net.Http.Headers;
using System.Runtime.InteropServices;
using System.Text;
using System.Threading;
using System.Threading.Tasks;
namespace DWSIM.Simulate365.Services
{
public class UserService
{
private static UserService _singletonInstance;
private UserDetailsModel _currentUser = null;
public EventHandler OnUserLoggedIn;
public EventHandler<bool> AutoLoginInProgress;
private string _accessToken = null;
private string _refreshToken = null;
private AccessTokenType _accessTokenType = AccessTokenType.MsGraph;
private DateTime _accessTokenExpiresAt = DateTime.MinValue;
private System.Timers.Timer refreshTokenTimer;
private static string AccessTokenTypeField = "AccessTokenType";
private static string AccessTokenField = "AccessTokenV2";
private static string RefreshTokenField = "RefreshTokenV2";
private static string AccessTokenExpiresAtField = "AccessTokenExpiresAtV2";
private Dictionary<AccessTokenType, IUserProvider> _userProviders = new Dictionary<AccessTokenType, IUserProvider> {
{AccessTokenType.MsGraph,new MsGraphUserProvider() }
};
#region Public events
public event EventHandler<UserDetailsModel> UserDetailsLoaded;
public event EventHandler<bool> AutoLoginInProgressChanged;
public event EventHandler UserLoggedOut;
public event EventHandler ShowLoginForm;
#endregion
public UserDetailsModel CurrentUser { get { return _currentUser; } }
private UserService()
{
// Read from registry
RegistryKey key = Registry.CurrentUser.CreateSubKey(@"SOFTWARE\DWSIM");
if (key != null)
{
this._accessToken = key.GetValue(AccessTokenField)?.ToString();
this._refreshToken = key.GetValue(RefreshTokenField)?.ToString();
this._accessTokenType = (AccessTokenType)Enum.Parse(typeof(AccessTokenType), key.GetValue(AccessTokenTypeField)?.ToString() ?? "0");
var expiresAtValue = key.GetValue(AccessTokenExpiresAtField);
if (expiresAtValue != null)
DateTime.TryParse(key.GetValue(AccessTokenExpiresAtField).ToString(), out this._accessTokenExpiresAt);
AutoLoginInProgress += (s, e) => { AutoLoginInProgressChanged.Invoke(s, e); };
Task.Run(() => LoadUserDetails());
}
//Intended use to refresh token on page startup
#pragma warning disable
if (!string.IsNullOrWhiteSpace(this._refreshToken))
{
RefreshToken();
}
refreshTokenTimer = new System.Timers.Timer();
refreshTokenTimer.Elapsed += async (sender, args) =>
{
if (this._accessTokenExpiresAt != DateTime.MinValue && this._accessTokenExpiresAt.AddMinutes(-5) < DateTime.Now)
{
await GetInstance().RefreshToken();
}
};
refreshTokenTimer.AutoReset = true;
refreshTokenTimer.Interval = TimeSpan.FromMinutes(1).TotalMilliseconds;
refreshTokenTimer.Start();
}
public bool _IsLoggedIn()
{
return this._accessToken != null && this._accessTokenExpiresAt > DateTime.Now;
}
public static UserService GetInstance()
{
if (_singletonInstance == null)
_singletonInstance = new UserService();
return _singletonInstance;
}
public static void Logout()
{
_singletonInstance.ClearInstance();
_singletonInstance.UserLoggedOut?.Invoke(_singletonInstance, new EventArgs());
}
private void ClearInstance()
{
_accessToken = null;
_refreshToken = null;
_currentUser = null;
_accessTokenExpiresAt = DateTime.MinValue;
RegistryKey key = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\DWSIM", true);
if (key != null)
{
try
{
key.DeleteValue(AccessTokenField);
key.DeleteValue(RefreshTokenField);
key.DeleteValue(AccessTokenExpiresAtField);
}
catch (Exception)
{
}
try
{
Directory.Delete(WebUIForm.USER_DATA_FOLDER, true);
}
catch (Exception ex)
{
}
UserLoggedOut?.Invoke(this, null);
}
}
/// <summary>
/// Returns authenticaiton token or null if it doesn't exist.
/// </summary>
public string GetUserToken()
{
return this._accessToken;
}
public void SetAccessToken(AccessTokenType accessTokenType, string accessToken, string refreshToken, DateTime expiresAt)
{
_accessToken = accessToken;
_refreshToken = refreshToken;
_accessTokenExpiresAt = expiresAt;
_accessTokenType = accessTokenType;
// Save to registry
RegistryKey key = Registry.CurrentUser.OpenSubKey(@"SOFTWARE\DWSIM", true);
if (key == null)
key = Registry.CurrentUser.CreateSubKey(@"SOFTWARE\DWSIM", true);
//storing the values
key.SetValue(AccessTokenTypeField, accessTokenType);
key.SetValue(AccessTokenField, _accessToken);
key.SetValue(RefreshTokenField, _refreshToken);
key.SetValue(AccessTokenExpiresAtField, _accessTokenExpiresAt.ToString());
key.Close();
Task.Run(() => LoadUserDetails());
}
private async Task LoadUserDetails()
{
try
{
if (string.IsNullOrWhiteSpace(this._accessToken))
return;
if (!_userProviders.ContainsKey(_accessTokenType))
throw new Exception($"User provider not registered for type {_accessTokenType}.");
var userProvider = _userProviders[_accessTokenType];
_currentUser = await userProvider.GetUserDetailsAsync(_accessToken);
// Trigger event, swallow all errors
try
{
UserDetailsLoaded?.Invoke(this, _currentUser);
}
catch { }
}
catch (Exception e)
{
}
}
public void RegisterUserDetailsProvider(AccessTokenType accessTokenType, IUserProvider userDetailsProvider)
{
if (!_userProviders.ContainsKey(accessTokenType))
{
_userProviders.Add(accessTokenType, userDetailsProvider);
}
}
public void ShowLogin()
{
ShowLoginForm?.Invoke(this, new EventArgs());
}
public async Task<bool> RefreshToken()
{
try
{
if (!_userProviders.ContainsKey(_accessTokenType))
throw new Exception($"User provider not registered for type {_accessTokenType}.");
// Deserialize
var userProvider = _userProviders[_accessTokenType];
var tokenResp = await userProvider.RefreshTokenAsync(_refreshToken);
if (tokenResp == null)
return false;
SetAccessToken(tokenResp.AccessTokenType, tokenResp.AccessToken, tokenResp.RefreshToken, DateTime.Now.AddSeconds(tokenResp.ExpiresIn - 30));
return true;
}
catch (Exception ex)
{
return false;
}
}
}
}
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