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如何使用ASP.NET MVC Framework Preview 2 中ActionFilterAttribute属性设计Form用户验证

首先采用BaseController继承Controller以改写保护方法RedirectToAction为公有方法（用以在ActionFilterAttribute属性中使用），本例中扩展了两个属性RequireLoginAttribute 、 RequireRoleAttribute；在RequireLoginAttribute属性过滤中重定向为登录的用户到登录窗户、在 RequireRoleAttribute属性过滤中将非该用户角色的操作显示访问拒绝信息，具体代码如下： 

基础请看 David Hayden [MVP C#] 的 actionfilterattribute-in-asp-net-mvc-framework

This code is my extended ActionFilterAttribute as RequireLoginAttribute and RequireRoleAttribute for form authentication, I just write the BaseController to public the Controller's RedirectToAction function for use it in extended ActionFilterAttribute.

Just for fun with coding！

namespace Bolik.Web.Mvc
{
  using System;
  using System.Web.Mvc;
  using System.Threading;

  public class BaseController : Controller
  {   
    protected override void Execute(ControllerContext controllerContext)
    {      
      try
      {
        base.Execute(controllerContext);
      }
      catch (Exception e)
      {
        if (!(e is ThreadAbortException))
        {
          ViewData["ErrorMessage"] = e.Message;
          RenderView("Error", ViewData);
        }
      }
    }    

    public new void RedirectToAction(string actionName, string controllerName)
    {
      base.RedirectToAction(actionName, controllerName);
    }
  }
  
  public class RequireLoginAttribute : ActionFilterAttribute
  {
    public override void OnActionExecuting(FilterExecutingContext filterContext)
    {
      if (filterContext.Controller is BaseController)
      {
        var b = filterContext.Controller as BaseController;
        if (b != null)
        {
          if (!b.User.Identity.IsAuthenticated)
          {
            filterContext.Cancel = true;
            b.RedirectToAction("Login", "Security");
          }
        }
      }
      base.OnActionExecuting(filterContext);
    }
  }

  public class RequireRoleAttribute : ActionFilterAttribute
  {
    private readonly string _RoleName;

    public RequireRoleAttribute(string roleName)
    {
      _RoleName = roleName;
    }

    public override void OnActionExecuting(FilterExecutingContext filterContext)
    {
      if (filterContext.Controller is BaseController)
      {
        var b = filterContext.Controller as BaseController;
        if (b != null)
        {
          if (!b.User.IsInRole(_RoleName))
          {
            filterContext.Cancel = true;
            b.RedirectToAction("AccessDenied", "Error");
          }
        }
      }
      base.OnActionExecuting(filterContext);
    }
  }
}

使用代码如下：

namespace Bolik.Controllers
{
  using System;
  using System.Web.Security;
  using System.Web.Routing;
  using System.Web.Mvc;   
  using Bolik.Web.Mvc;
  using Binding = System.Web.Mvc.BindingHelperExtensions;

  public class HomeController : BaseController
  {
    public void Index(string name)
    {
      RenderView("Index");
    }

    public void About()
    {
      RenderView("About")
    }

    public void FourOhFour()
    {
      throw new ArgumentException();
    }

    public void FiveOhOh()
    {
      throw new ApplicationException();
    }

    [RequireLogin]
    public void Secure()
    {
      RenderView("Secure");
    }

    [RequireRole("Administrator")]
    public void AdminsOnly()
    {
       RenderView("AdminsOnly");
    }   
  }
 
  public class SecurityController : BaseController
  {
    public void Login()
    {
      RenderView("Login");
    }  

    [RequireLogin]
    public void Logout()
    {
      FormsAuthentication.SignOut();
      Response.Redirect("/");      
    }

    public void Authenticate()
    {
      string userName = Request.Form["userName"];
      string password = Request.Form["password"];
      string rememberMe = Request.Form["rememberMe"];

      if (Membership.ValidateUser(userName, password))
      {
        FormsAuthentication.SetAuthCookie(userName, (rememberMe != null));
        RedirectToAction("index", "Home");       
      }
    }    
  }
}