using System;
using System.Collections.Generic;
using System.Web;
using System.Web.Security;

namespace Mtxfw.Utility
{
    /*  2011.2.27 by Telesa */

    /// <summary>
    /// FromsAuthentication 身份验证类
    /// </summary>
    public class Authentication
    {
        #region 私有成员
        private bool _IsAuthenticated = false;
        private string _FormsCookieName = string.Empty;

        #endregion

        #region 公共属性
        /// <summary>
        /// 获取一个值 指示是否验证了请求
        /// </summary>
        public bool IsAuthenticated
        {
            get { return _IsAuthenticated; }
        }

        /// <summary>
        /// 获取用于存储 Forms 身份验证票证的 Cookie 名称。默认值是“.ASPXAUTH”。
        /// </summary>
        public string FormsCookieName
        {
            get { return _FormsCookieName; }
        }

        #endregion

        #region 构造函数
        /// <summary>
        /// 创建一个 Authentication 对象
        /// </summary>
        public Authentication()
        {
            _IsAuthenticated = System.Web.HttpContext.Current.Request.IsAuthenticated; 
        }
        #endregion

        #region 公共方法

        /// <summary>
        /// 将验证过的票据 写在 HttpContext.User 中
        /// </summary>
        /// <param name="sender">Global全局对象</param>
        public void RequestAuthenticate(object sender)
        {
            try
            {
                HttpApplication app = sender as HttpApplication;
                HttpContext context = app.Context;
                if (_IsAuthenticated)
                {
                    FormsIdentity identity = context.User.Identity as FormsIdentity;
                    FormsAuthenticationTicket ticket = identity.Ticket;
                    String[] roles = ticket.UserData.Split(',');
                    context.User = new System.Security.Principal.GenericPrincipal(identity, roles);
                }
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 使用 Cookie 名、版本、过期日期、发布日期、持久性以及用户特定的数据初始化 System.Web.Security.FormsAuthenticationTicket
        /// 类的新实例。Cookie 路径设置为在应用程序的配置文件中建立的默认值。
        /// </summary>
        /// <param name="version">票证的版本号</param>
        /// <param name="name">与票证关联的用户名</param>
        /// <param name="issueDate">票证发出时的本地日期和时间</param>
        /// <param name="expiration">票证过期时的本地日期和时间</param>
        /// <param name="isPersistent">如果票证将存储在持久性 Cookie 中（跨浏览器会话保存），则为 true；否则为 false。如果该票证存储在 URL 中，将忽略此值。Cookie</param>
        /// <param name="userData">存储在票证中的用户特定的数据。</param>
        public void CreateAuthenticate(int version, string name, DateTime issueDate, DateTime expiration, bool isPersistent, string userData)
        {
            try
            {
                FormsAuthenticationTicket Ticket = new FormsAuthenticationTicket(
                    version,
                    name,
                    issueDate,
                    expiration,
                    isPersistent,
                    userData);
                String HachTicket = FormsAuthentication.Encrypt(Ticket);
                HttpCookie httpCookie = new HttpCookie(FormsAuthentication.FormsCookieName, HachTicket);
                _FormsCookieName = FormsAuthentication.FormsCookieName;
                System.Web.HttpContext.Current.Response.Cookies.Add(httpCookie);
            }
            catch (Exception ex)
            {
                throw ex;
            }
        }


        /// <summary>
        /// 使用 cookie 名、版本、目录路径、发布日期、过期日期、持久性以及用户定义的数据初始化 System.Web.Security.FormsAuthenticationTicket
        //  类的新实例。
        /// </summary>
        /// <param name="version">票证的版本号</param>
        /// <param name="name">与票证关联的用户名</param>
        /// <param name="issueDate">票证发出时的本地日期和时间</param>
        /// <param name="expiration">票证过期时的本地日期和时间</param>
        /// <param name="isPersistent">如果票证将存储在持久性 Cookie 中（跨浏览器会话保存），则为 true；否则为 false。如果该票证存储在 URL 中，将忽略此值。Cookie</param>
        /// <param name="userData">存储在票证中的用户特定的数据。</param>
        /// <param name="cookiePath">票证存储在 Cookie 中时的路径。</param>
        public void CreateAuthenticate(int version, string name, DateTime issueDate, DateTime expiration, bool isPersistent, string userData, string cookiePath)
        {
            try
            {
                FormsAuthenticationTicket Ticket = new FormsAuthenticationTicket(
                    version,
                    name,
                    issueDate,
                    expiration,
                    isPersistent,
                    userData,
                    cookiePath);
                String HachTicket = FormsAuthentication.Encrypt(Ticket);
                HttpCookie httpCookie = new HttpCookie(FormsAuthentication.FormsCookieName, HachTicket);
                _FormsCookieName = FormsAuthentication.FormsCookieName;
                System.Web.HttpContext.Current.Response.Cookies.Add(httpCookie);
            }
            catch(Exception ex)
            {
                throw ex;
            }
        }

        /// <summary>
        /// 从浏览器中删除 Forms 身份验证
        /// </summary>
        public void SignOut()
        {
            FormsAuthentication.SignOut(); 
        }

        /// <summary>
        /// 跳转到 ReturnUrl 页
        /// </summary>
        public void GoToUrl()
        {
            System.Web.HttpContext.Current.Response.Redirect("/_admin/Index.aspx");
        }

        /// <summary>
        /// 跳转到指定页
        /// </summary>
        public void GoToUrl(string url)
        {
            System.Web.HttpContext.Current.Response.Redirect(url);
        }
        #endregion
    }
}