MVC中Forms身份验证身份验证流程

验证流程

一、用户登录
  1、验证表单:ModelState.IsValid
  2、验证用户名和密码:通过查询数据库验证
  3、如果用户名和密码正确,则在客户端保存Cookie以保存用户登录状态:SetAuthCookie
    1):从数据库中查出用户名和一些必要的信息,并把额外信息保存到UserData中
    2):把用户名和UserData保存到 FormsAuthenticationTicket 票据中
    3):对票据进行加密 Encrypt
    4):将加密后的票据保存到Cookie发送到客户端
  4、跳转到登录前的页面
5、如果登录失败,返回当前视图
二、验证登录
  1、在Global中注册PostAuthenticateRequest事件函数,用于解析客户端发过来的Cookie数据
    1):通过 HttpContext.Current.User.Identity 判断用户是否登录(FormsIdentity,IsAuthenticated,AuthenticationType)
    2):从HttpContext 的Request的Cookie中解析出Value,解密得到 FormsAuthenticationTicket 得到UserData
  2、角色验证
    在Action加入 Authorize特性,可以进行角色验证
    在 HttpContext.Current.User 的 IsInRole 方法进行角色认证(需要重写)

一、用户登录

1、设置web.config

设置重定向登录页面


      


注释掉

     

2、登陆的验证中控制器

控制器中加“[Authorize]”修饰的方法拒绝匿名。
 public class UserInfoController : Controller //控制器
 {
    //身份验证过滤器
        [Authorize]
        public ActionResult Index()
        {
            return View();
        }
 }
控制器中登录
         /// 
        /// 用户登录
        /// 
        /// 
        public ActionResult login()
        {
            return View();
        }        
        [HttpPost]
        public ActionResult login(loginModels login) {
            if (ModelState.IsValid)
            {
                var model = db.Admininfo.FirstOrDefault(a => a.AdminAccount == login.AdminAccount && a.AdminPwd == login.AdminPwd);
                if (model != null)
                {
                    //存入票据(用户登录的时候去存信息,如果有信息直接去登录)
                    var dtoModel = new Users
                    {
                        id = model.id,
                        AdminPwd = model.AdminPwd,
                        AdminAccount=model.AdminAccount
                    };
                    //调用
                    SetAuthCookie(dtoModel);
                    //获取登录地址
                    var returnUrl = Request["ReturnUrl"];
                    //判断登录地址是不是空值
                    if (!string.IsNullOrWhiteSpace(returnUrl))
                    {                      
                        return Redirect(returnUrl);
                    }
                    else
                    {
                        //return RedirectiToAction
                        return Redirect("/Home/index");
                    }

                }
                else
                {
                    ModelState.AddModelError("", "账号密码不对");
                    return View(login);
                }
            }
            else
            {
                ModelState.AddModelError("", "输入的信息有误");
                return View(login);

            }

对登录账号进行cookie
        /// 
        /// 对登录账号进行cookie
        /// 
        /// 
        public void SetAuthCookie(Users loginModel) {
            //1、将对象转换成json
            var userdata = loginModel.ToJson();
            //2、创建票据FormsAuthenticationTicket
            FormsAuthenticationTicket ticket = new FormsAuthenticationTicket(2,"loginUser",DateTime.Now,DateTime.Now.AddDays(1), false, userdata);
            //对票据进行加密 
            var tickeEncrypt = FormsAuthentication.Encrypt(ticket);
            //创建Cookie,定义
            HttpCookie cookie = new HttpCookie(FormsAuthentication.FormsCookieName, tickeEncrypt);
            cookie.HttpOnly = true;
            cookie.Secure = FormsAuthentication.RequireSSL;
            cookie.Domain = FormsAuthentication.CookieDomain;
            cookie.Path = FormsAuthentication.FormsCookiePath;
            cookie.Expires = DateTime.Now.Add(FormsAuthentication.Timeout);
            //先移除cookie,在添加cookie
            Response.Cookies.Remove(FormsAuthentication.FormsCookieName);
            Response.Cookies.Add(cookie);
       } 

3、Models中添加模型文件

 public class loginModels
    {
        /// 
        /// 账号
        /// 
        [DisplayName("账号")]
        [Required(ErrorMessage = "账号不能为空")]   
        public string AdminAccount { get; set; }
        /// 
        /// 密码
        /// 
        [DisplayName("密码")]
        [Required(ErrorMessage = "密码不能为空")]
        public string AdminPwd { get; set; }
    }


4、Views中 Login 代码:

@using (Html.BeginForm("Login", "Account", new { ReturnUrl = ViewBag.ReturnUrl }, FormMethod.Post, new { @class = "form-horizontal", role = "form" }))

5、Global设置

protected void Application_AuthenticateRequest(object sender, EventArgs e)
        {
            //1、通过sender获取http请求
            // HttpApplication app = new HttpApplication();//实例化
            HttpApplication app = sender as HttpApplication;
            //2、拿到http上下文
            HttpContext context = app.Context;
            //3、根据FormsAuthe,来获取cookie
            var cookie = context.Request.Cookies[FormsAuthentication.FormsCookieName];
            if (cookie != null)
            {
                //获取cookie的值
                var ticket = FormsAuthentication.Decrypt(cookie.Value);
                if (!string.IsNullOrWhiteSpace(ticket.UserData))
                {
                    //把一个字符串类别变成实体模型
                    var model = ticket.UserData.ToObject();
                    //var acount = model.AdminAccount; //获取账号
                    context.User = new MyFormsPrincipal(ticket, model);
                    //MyFormsPrincipal.Identity = new FormsIdentity(ticket);
                    // MyFormsPrincipal.userdata;

                }
            }
        }

6、退出登录

控制器中
        /// 
        /// 退出登录
        /// 
        public ActionResult loginout()
        {
            //删除票据
            FormsAuthentication.SignOut();
            //清除cookie
            Response.Cookies[FormsAuthentication.FormsCookieName].Expires = DateTime.Now.AddDays(-1);
            Response.Cookies.Remove(FormsAuthentication.FormsCookieName);
            return RedirectToAction("Index", "Home");
 
        }
View跳转链接
@Html.ActionLink("安全退出","loginout","Users")

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