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.net MVC使用IPrincipal進行Form登錄即權(quán)限驗證（3）

 更新時間：2018年04月10日 11:21:55   作者：清幽火焰  
這篇文章主要為大家詳細介紹了.net MVC使用IPrincipal進行Form登錄即權(quán)限驗證，具有一定的參考價值，感興趣的小伙伴們可以參考一下

.net MVC使用IPrincipal進行Form登錄即權(quán)限驗證，供大家參考，具體內(nèi)容如下

1.在MVC項目中添加用戶類，可以根據(jù)實際項目需求添加必要屬性

public class UserData
 {
 /// <summary>
 /// ID
 /// </summary>
 public int UserId { get; set; }

 /// <summary>
 /// 用戶名
 /// </summary>
 public string UserName { get; set; }

 /// <summary>
 /// 角色ID列表
 /// </summary>
 public List<int> Roles { get; set; }
 }

2.添加類Principal實現(xiàn)IPrincipal接口

public class Principal : IPrincipal
 {
 public IIdentity Identity { get; private set;}

 public UserData Account { get; set; }

 /// <summary>
 /// 構(gòu)造函數(shù)
 /// </summary>
 /// <param name="ticket"></param>
 /// <param name="account"></param>
 public Principal(FormsAuthenticationTicket ticket, UserData account)
 {
  if (ticket == null)
  throw new ArgumentNullException("ticket");
  if (account == null)
  throw new ArgumentNullException("UserData");

  this.Identity = new FormsIdentity(ticket);
  this.Account = account;
 }

 public bool IsInRole(string role)
 {
  if (string.IsNullOrEmpty(role))
  return true;
  if (this.Account == null || this.Account.Roles == null)
  return false;
  return role.Split(',').Any(q => Account.Roles.Contains(int.Parse(q)));
 }
 }

IPrincipal接口有對象Identity已經(jīng)需要實現(xiàn)驗證角色方法IsInRole()。在我們的實現(xiàn)類中添加了"用戶信息(UserData)"屬性Account。

構(gòu)造函數(shù)中進行了初始化，第一個對象為Form驗證的票據(jù)對象，下面ticket會攜帶用戶信息一起保存進cookie中。

3.創(chuàng)建存儲cookie和讀取cookie的類

/// <summary>
 /// 寫入cookie和讀取cookie
 /// </summary>
 public class HttpFormsAuthentication
 {
 //將用戶信息通過ticket加密保存到cookie
 public static void SetAuthenticationCoolie(UserData account, int rememberDay = 0)
 {
  if (account == null)
  throw new ArgumentNullException("account");

  //序列化account對象
  string accountJson = JsonConvert.SerializeObject(account);
  //創(chuàng)建用戶票據(jù)
  var ticket = new FormsAuthenticationTicket(1, account.UserName, DateTime.Now, DateTime.Now.AddDays(rememberDay), false, accountJson);
  //加密
  string encryptAccount = FormsAuthentication.Encrypt(ticket);

  //創(chuàng)建cookie
  var cookie = new HttpCookie(FormsAuthentication.FormsCookieName, encryptAccount)
  {
  HttpOnly = true,
  Secure = FormsAuthentication.RequireSSL,
  Domain = FormsAuthentication.CookieDomain,
  Path = FormsAuthentication.FormsCookiePath
  };

  if (rememberDay > 0)
  cookie.Expires = DateTime.Now.AddDays(rememberDay);

  //寫入Cookie
  HttpContext.Current.Response.Cookies.Remove(cookie.Name);
  HttpContext.Current.Response.Cookies.Add(cookie);
 }

 //獲取cookie并解析出用戶信息
 public static Principal TryParsePrincipal(HttpContext context)
 {
  if (context == null)
  throw new ArgumentNullException("context");
  HttpRequest request = context.Request;
  HttpCookie cookie = request.Cookies[FormsAuthentication.FormsCookieName];
  if (cookie == null || string.IsNullOrEmpty(cookie.Value))
  {
  return null;
  }
  //解密coolie值
  FormsAuthenticationTicket ticket = FormsAuthentication.Decrypt(cookie.Value);

  UserData account = JsonConvert.DeserializeObject<UserData>(ticket.UserData);
  return new Principal(ticket, account);
 }

 }

存儲cookie時將用戶信息序列化后的字符串a(chǎn)ccountJson由ticket其攜帶加密后保存入cookie中，具體的accountJson被賦值給FormsAuthenticationTicket的UserData屬性。

可看到解析時將ticket.UserData反序列化后得到了原始的用戶信息對象，然后生成Principal對象。

解析cookie得到Principal對象的方法TryParsePrincipal，下面會在發(fā)起請求時用到，而返回的Principal對象被賦值給HttpContext.User。

4.在Global.asax中注冊Application_PostAuthenticateRequest事件，保證權(quán)限驗證前將cookie中的用戶信息取出賦值給User

protected void Application_PostAuthenticateRequest(object sender, System.EventArgs e)
 {
  HttpContext.Current.User =
  HttpFormsAuthentication.TryParsePrincipal(HttpContext.Current);
 }

 5.集成AuthorizeAttribute特性類并重寫AuthorizeCore，HandleUnauthorizedRequest方法

public class FormAuthorizeAttribute : AuthorizeAttribute
 {
 /// <summary>
 /// 先進入此方法，此方法中會調(diào)用 AuthorizeCore 驗證邏輯，驗證不通過會調(diào)用 HandleUnauthorizedRequest 方法
 /// </summary>
 /// <param name="filterContext"></param>
 public override void OnAuthorization(AuthorizationContext filterContext)
 {
  base.OnAuthorization(filterContext);
 }

 /// <summary>
 /// 權(quán)限驗證
 /// </summary>
 /// <param name="httpContext"></param>
 /// <returns></returns>
 protected override bool AuthorizeCore(HttpContextBase httpContext)
 {
  var user = httpContext.User as Principal;
  if (user != null)
  return user.IsInRole(base.Roles);
  return false;
 }

 protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
 {
  //驗證不通過，直接跳轉(zhuǎn)到相應(yīng)頁面，注意：如果不是喲娜那個以下跳轉(zhuǎn)，則會繼續(xù)執(zhí)行Action方法
  filterContext.Result = new RedirectResult("~/Login/Index");
 }
 }

AuthorizeCore與HandleUnauthorizedRequest方法均是在方法OnAuthorization中調(diào)用，AuthorizeCore驗證不通過才會調(diào)用HandleUnauthorizedRequest方法。

將驗證代碼在AuthorizeCore中實現(xiàn)，驗證不通過的邏輯在HandleUnauthorizedRequest方法中實現(xiàn)。

6.添加LoginController實現(xiàn)登錄邏輯

namespace MVCAuthorizeTest.Controllers
{
 public class LoginController : Controller
 {
 [AllowAnonymous]
 // GET: Login
 public ActionResult Index(string returnUrl)
 {
  ViewBag.ReturnUrl = returnUrl;
  return View();
 }

 [HttpPost]
 [AllowAnonymous]
 public ActionResult Index(string name, string password, bool rememberMe, string returnUrl)
 {
  var account = new UserData()
  {
  UserName = name,
  UserId = 110,
  Roles = new List<int>() { 1, 2, 3 }
  };
  HttpFormsAuthentication.SetAuthenticationCoolie(account, rememberMe ? 7 : 0);
  if (Url.IsLocalUrl(returnUrl) && returnUrl.Length > 1 && returnUrl.StartsWith("/") && !returnUrl.StartsWith("http://") && !returnUrl.StartsWith("/\\"))
  {
  return Redirect(returnUrl);
  }
  else
  {
  return RedirectToAction("Index", "Home");
  }
 }

 // POST: /Account/LogOff
 [HttpPost]
 public ActionResult LogOff()
 {
  System.Web.Security.FormsAuthentication.SignOut();
  return RedirectToAction("Index", "Home");
 }
 }
}

7.對需要驗證的controller或action添加特性標簽

 [FormAuthorize(Roles = "1,2")]
 public class HomeController : Controller
 {
 [FormAuthorize]
 public ActionResult Index()
 {
  return View();
 }
 }

如圖

8.在添加FilterConfig中添加全局注冊filter，減少每個action分別設(shè)置。如果有不需要驗證的頁面，添加[AllowAnonymous]特性即可

public class FilterConfig
 {
 public static void RegisterGlobalFilters(GlobalFilterCollection filters)
 {
 filters.Add(new HandleErrorAttribute());
 //全局注冊filter
 filters.Add(new FormAuthorizeAttribute());
 }
 }

以上就是本文的全部內(nèi)容，希望對大家的學習有所幫助，也希望大家多多支持腳本之家。

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