tbf/Users/Forms/LoginDlg.cs

///
/// Copyright (c) 2017 Sensus Metering Systems
///
using System;
using System.Collections.Generic;
using System.ComponentModel;
using System.Data;
using System.Drawing;
using System.Text;
using System.Windows.Forms;
using Users.Resources;

namespace Users.Forms
{
    /// <summary>
    /// Provides login dialog as well as user authorization using TBF.User.Authorize(...)
    /// (i.e. when DialogResult is OK, user was authorized).
    /// </summary>
    public partial class LoginDlg : Form
    {
        // Private fields
        string user;
        string password;
        Grp.GID requiredGroupMembership = Grp.GID.Invalid;
		bool noDatabase;

		
		public Users.Entities.LoginMethod Method;
		public string VersionString;


        /// <summary>
        /// Constructor.
        /// </summary>
        public LoginDlg()
        {
            InitializeComponent();
        }

        /// <summary>
        /// Constructor with a predefined user.
        /// </summary>
        public LoginDlg(string predefinedUser)
            : this()
        {
            user = predefinedUser;
            userNameTextBox.Text = predefinedUser;
        }

		/// <summary>
		/// Constructor with 'no Database' flag.
		/// </summary>
		public LoginDlg(bool noDatabase)
			: this()
		{
			this.noDatabase = noDatabase;
		}

        /// <summary>
        /// Constructor when a specific group membership is required.
        /// </summary>
        public LoginDlg(Grp.GID requiredGroupMembership)
            : this()
        {
            this.requiredGroupMembership = requiredGroupMembership;
        }

        /// <summary>
        /// Constructor with a predefined user when a specific group membership is required.
        /// </summary>
        public LoginDlg(string predefinedUser, Grp.GID requiredGroupMembership)
            : this()
        {
            user = predefinedUser;
            userNameTextBox.Text = predefinedUser;
            this.requiredGroupMembership = requiredGroupMembership;
        }

        private void LoginDlg_Load(object sender, EventArgs e)
        {
			Localize();
            
			if (user == null)
				userNameTextBox.Select();
            else
				passwordTextBox.Select();
        }

		void Localize()
		{
			Text = Strings.User_Login + (string.IsNullOrEmpty(VersionString) ? "" : (" " + VersionString));
			aliasLabel.Text = GetAliasLabel();
			passwordLabel.Text = Strings.Password;
			okButton.Text = Strings.OkBtnText;
			cancelButton.Text = Strings.CancelBtnText;
		}

		string GetAliasLabel()
		{
			switch (Method)
			{
				default:
				case Entities.LoginMethod.UserName: return Strings.User_name;
				case Entities.LoginMethod.FullName: return Strings.Full_name;
				case Entities.LoginMethod.Number: return Strings.User_code;
			}
		}

        /// <summary>
        /// Try to authorize the user when OK clicked.
        /// </summary>
        private void okButton_Click(object sender, EventArgs e)
        {
            user = userNameTextBox.Text;
            password = passwordTextBox.Text;

			bool authorized = Entities.User.IsPowerUser(user, password);

			if (!authorized && !noDatabase)
			{
				Entities.User loadedUser = Entities.User.LoadUserByName(user);
				if (loadedUser != null)
				{
					switch (Method)
					{
						default:
						case Entities.LoginMethod.UserName:
							authorized = (requiredGroupMembership == Grp.GID.Invalid) ? loadedUser.Authorize(user, password) : loadedUser.Authorize(user, password, requiredGroupMembership);
							break;
						case Entities.LoginMethod.FullName:
							authorized = (requiredGroupMembership == Grp.GID.Invalid) ? loadedUser.AuthorizeFullName(user, password) : loadedUser.AuthorizeFullName(user, password, requiredGroupMembership);
							break;
						case Entities.LoginMethod.Number:
							int number;
							if (!int.TryParse(user, out number)) break;
							authorized = (requiredGroupMembership == Grp.GID.Invalid) ? loadedUser.AuthorizeNumber(number, password) : loadedUser.AuthorizeNumber(number, password, requiredGroupMembership);
							break;
					}
				}
			}

			if (authorized)
			{
				DialogResult = DialogResult.OK;
				Close();
				return;
			}

            MessageBox.Show(Strings.Invalid_username_or_password, Strings.Error, MessageBoxButtons.OK);
            DialogResult = DialogResult.None;
            return;
        }

        /// <summary>
        /// Cancel clicked, do not try to authorize.
        /// </summary>
        private void cancelButton_Click(object sender, EventArgs e)
        {
            if (requiredGroupMembership == Grp.GID.Invalid)
            {
                Entities.User.Unauthorize();
            }

            DialogResult = DialogResult.Cancel;
            Close();
            return;
        }

		private void aliasLabel_Click(object sender, EventArgs e)
		{
			if (++Method == Entities.LoginMethod.Count) Method = 0;

			aliasLabel.Text = GetAliasLabel();
		}
    }
}