infineon_cs_hmi/uniper_hmi/UniperHMI/Common/UserManagementWindowVm.cs

using CommunityToolkit.Mvvm.ComponentModel;
using CommunityToolkit.Mvvm.Input;
using Heisig.HMI.AdsManager;
using HMIToolkit;
using InfineonHMI.Common;
using MahApps.Metro.Controls;
using Microsoft.Win32;
using System.Collections.ObjectModel;
using System.ComponentModel.DataAnnotations;
using System.Drawing.Text;
using System.Security;
using System.Windows;
using System.Windows.Controls;
using System.Windows.Input;
using TwinCAT.TypeSystem;

namespace Common;

public sealed partial class UserManagementWindowVm : ObservableValidator
{

	private IAdsManager _adsManager;
	private readonly string _variableName;

	[ObservableProperty] private string? selectedUsername;

	[ObservableProperty] private string newUser;

	[ObservableProperty] private ObservableCollection<string>? savedUsers;

	private ObservableCollection<User> users;

	private UserManagementWindow dlg = new UserManagementWindow();

	private string selectedUserPassword;

	private string filePath = "C:\\ProgramData\\InfineonHMI_UserData\\Userdata.xml";

	private string selectedUserPasswordWdh;
	public User CurrentUser { get; set; }
	public string SelectedUserPassword
	{
		get { return selectedUserPassword; }
		set
		{
			SetProperty(ref selectedUserPassword, value);
			IsCreateCommandEnabled = SelectedUserPasswordWdh.Equals(value) && !string.IsNullOrEmpty(value)&& CurrentUser.UserLevel>0;
		}
	}

	public string? SelectedUserPasswordWdh
	{
		get { return selectedUserPasswordWdh; }
		set
		{
			SetProperty(ref selectedUserPasswordWdh, value);
			IsCreateCommandEnabled = SelectedUserPassword.Equals(value) && !string.IsNullOrEmpty(value) && CurrentUser.UserLevel > 0;
		}
	}

	[ObservableProperty] private bool isCreateCommandEnabled;

	
	public UserManagementWindowVm()
	{
		IsCreateCommandEnabled = false;
		CurrentUser = new("default", "default", 0);
		users = L4ItXmlSerializer.DeSerializeObject<ObservableCollection<User>>(filePath);
		savedUsers = new ObservableCollection<string>();
		foreach (var user in users)
		{
			if (user.UserName != null)
				savedUsers.Add(user.UserName);
		}

		selectedUserPassword = "";
		selectedUserPasswordWdh = "";
		selectedUsername = "";
		SelectedUserPasswordWdh = "";
		SelectedUserPassword = "";
		SelectedUsername = "";
	}

	public UserManagementWindowVm(User curUser)
	{
		IsCreateCommandEnabled = true;
		if (curUser != null)
		{
			CurrentUser = curUser;
		}
		else
		{
			CurrentUser = new User("unknown", "default", 100);
		}
		users = L4ItXmlSerializer.DeSerializeObject<ObservableCollection<User>>(filePath);
		savedUsers = new ObservableCollection<string>();
		if (users == null)
		{
			users = new ObservableCollection<User>();
			users.Add(new User("default", "ssW+1nwLrdWTKi1tkE/pfQ==", 100));
		}

		
		foreach (var user in users)
		{
			if(user.UserName != null) 
				savedUsers.Add(user.UserName);
		}

		selectedUserPassword = "";
		selectedUserPasswordWdh = "";
		selectedUsername = "";
		SelectedUserPasswordWdh = "";
		SelectedUserPassword = "";
		SelectedUsername = "";

	}

	public User GetCurrentUserLevel()
	{
		dlg.DataContext = this;

		dlg.ShowDialog();
		
		return CurrentUser;
	}

	[RelayCommand]
	private void Login()
	{

		User userInFile = new User("default", "default", 0);
		bool userFound = false;
		foreach (var user in users)
		{
			if (user.UserName.Equals(SelectedUsername))
			{
				userInFile = user;
				userFound = true;
				break;
			}
		}

		if (userFound && CheckPassword(userInFile))
		{
			CurrentUser = userInFile;
		}

		dlg.Close();

	}

	[RelayCommand]
	private void Logoff()
	{
		CurrentUser = new User("default", "default", 0);
		dlg.Close();
	}

	[RelayCommand]
	private void CreateUser()
	{
		if(!SelectedUserPassword.Equals(SelectedUserPasswordWdh))
			return;

		if (users == null)
			users = new ();
		var u = new User
		{
			UserName = NewUser,
			PasswordHash = L4ItXmlSerializer.Encrypt(SelectedUserPassword),
			UserLevel = 100,
		};

		users.Add(new User(u));
		SavedUsers.Add(NewUser);

		SelectedUserPassword = "";
		SelectedUserPasswordWdh = "";

		L4ItXmlSerializer.SerializeObject(users, filePath);

	}

	[RelayCommand]
	private void DeleteUser()
	{
		if (SelectedUsername.Equals("default"))
			return;

		users.Remove(users.First(user => user.UserName.Equals(SelectedUsername)));

		SavedUsers = new ObservableCollection<string>();
		foreach (var user in users)
		{
			SavedUsers.Add(user.UserName);
		}

		L4ItXmlSerializer.SerializeObject(users, filePath);

	}

	private bool CheckPassword(User user)
	{
		var hashcode = L4ItXmlSerializer.Decrypt(user.PasswordHash);
		if (hashcode.Equals(SelectedUserPassword)) 
			return true;

		return false;
	}

	
}