ASP.NET MVC 4自定义Authorize属性 - 如何将未经授权的用户重定向到错误页面？

Question

我正在使用自定义授权属性根据用户的权限级别授权用户访问权限.我需要重定向未经授权的用户(例如,用户尝试删除没有删除访问级别的发票)以访问被拒绝的页面.

自定义属性正在运行.但是在未经授权的用户访问的情况下,浏览器中没有显示任何内容.

控制器代码.

public class InvoiceController : Controller
{
    [AuthorizeUser(AccessLevel = "Create")]
    public ActionResult CreateNewInvoice()
    {
        //...

        return View();
    }

    [AuthorizeUser(AccessLevel = "Delete")]
    public ActionResult DeleteInvoice(...)
    {
        //...

        return View();
    }

    // more codes/ methods etc.
}

自定义属性类代码.

public class AuthorizeUserAttribute : AuthorizeAttribute
{
    // Custom property
    public string AccessLevel { get; set; }

    protected override bool AuthorizeCore(HttpContextBase httpContext)
    {
        var isAuthorized = base.AuthorizeCore(httpContext);
        if (!isAuthorized)
        {                
            return false;
        }

        string privilegeLevels = string.Join("", GetUserRights(httpContext.User.Identity.Name.ToString())); // Call another method to get rights of the user from DB

        if (privilegeLevels.Contains(this.AccessLevel))
        {
            return true;
        }
        else
        {
            return false;
        }            
    }
}

感谢您是否可以分享您的经验.

Answer 1

您必须覆盖此处HandleUnauthorizedRequest指定的内容.

public class CustomAuthorize: AuthorizeAttribute
{
    protected override void HandleUnauthorizedRequest(AuthorizationContext filterContext)
    {
        if(!filterContext.HttpContext.User.Identity.IsAuthenticated)
        {
            base.HandleUnauthorizedRequest(filterContext);
        }
        else
        {
            filterContext.Result = new RedirectToRouteResult(new
            RouteValueDictionary(new{ controller = "Error", action = "AccessDenied" }));
        }
    }
}

**注意:2016年1月更新的条件声明