MVC中使用AuthorizeAttribute作身份驗證操做

代碼順序爲:OnAuthorization-->AuthorizeCore-->HandleUnauthorizedRequest 




若是AuthorizeCore返回false時,纔會走HandleUnauthorizedRequest 方法,而且Request.StausCode會返回401,401錯誤又對應了Web.config中

的

<authentication mode="Forms">
       <forms loginUrl="~/" timeout="2880" />
     </authentication>

全部,AuthorizeCore==false 時,會跳轉到 web.config 中定義的  loginUrl="~/"




[csharp] view plaincopy
01.public class CheckLoginAttribute : AuthorizeAttribute  
02.   {  
03.  
04.       protected override bool AuthorizeCore(HttpContextBase httpContext)  
05.       {  
06.           bool Pass = false;  
07.           if (!CheckLogin.AdminLoginCheck())  
08.           {  
09.               httpContext.Response.StatusCode = 401;//無權限狀態碼  
10.               Pass = false;  
11.           }  
12.           else   
13.           {  
14.               Pass = true;  
15.           }  
16.  
17.           return Pass;  
18.       }  
19.  
20.        
21.  
22.       protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)  
23.       {  
24.           base.HandleUnauthorizedRequest(filterContext);  
25.           if (filterContext.HttpContext.Response.StatusCode == 401)  
26.           {  
27.               filterContext.Result = new RedirectResult("/");  
28.           }  
29.       }  
30.        
31.  
32.       
33.   }  




AuthorizeAttribute的OnAuthorization方法內部調用了AuthorizeCore方法,這個方法是實現驗證和受權邏輯的地方,若是這個方法返回true,

 

   表示受權成功,若是返回false, 表示受權失敗, 會給上下文設置一個HttpUnauthorizedResult,這個ActionResult執行的結果是向瀏覽器返回

 

   一個401狀態碼(未受權),可是返回狀態碼沒什麼意思,一般是跳轉到一個登陸頁面,能夠重寫AuthorizeAttribute的

   HandleUnauthorizedRequest 



[csharp] view plaincopy
01.protected override void HandleUnauthorizedRequest(AuthorizationContext context)  
02.        {  
03.            if (context == null)  
04.            {  
05.                throw new ArgumentNullException("filterContext");  
06.            }  
07.            else  
08.            {  
09.                string path = context.HttpContext.Request.Path;  
10.                string strUrl = "/Account/LogOn?returnUrl={0}";  
11.                  
12.                context.HttpContext.Response.Redirect(string.Format(strUrl, HttpUtility.UrlEncode(path)), true);  
13.                  
14.            }  
15.              
16.        }  

轉自:http://blog.csdn.net/try530/article/details/7782704web

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