Question

如何创建自定义属性以扩展MVC中的现有Authorize属性？

Answer 1

从AuthorizeAttribute派生您的课程。重写OnAuthorization方法。添加并设置CacheValidationHandler。

public void CacheValidationHandler( HttpContext context,
                                    object data,
                                    ref HttpValidationStatus validationStatus )
{
    validationStatus = OnCacheAuthorization( new HttpContextWrapper( context ) );
}


public override void OnAuthorization( AuthorizationContext filterContext )
{
    if (filterContext == null)
    {
        throw new ArgumentNullException( "filterContext" );
    }

    if (AuthorizeCore( filterContext.HttpContext ))
    {
       ... your custom code ...
       SetCachePolicy( filterContext );
    }
    else if (!filterContext.HttpContext.User.Identity.IsAuthenticated)
    {
        // auth failed, redirect to login page
        filterContext.Result = new HttpUnauthorizedResult();
    }
    else
    {
       ... handle a different case than not authenticated
    }
}


protected void SetCachePolicy( AuthorizationContext filterContext )
 {
     // ** IMPORTANT **
     // Since we're performing authorization at the action level, the authorization code runs
     // after the output caching module. In the worst case this could allow an authorized user
     // to cause the page to be cached, then an unauthorized user would later be served the
     // cached page. We work around this by telling proxies not to cache the sensitive page,
     // then we hook our custom authorization code into the caching mechanism so that we have
     // the final say on whether a page should be served from the cache.
     HttpCachePolicyBase cachePolicy = filterContext.HttpContext.Response.Cache;
     cachePolicy.SetProxyMaxAge( new TimeSpan( 0 ) );
     cachePolicy.AddValidationCallback( CacheValidationHandler, null /* data */);
 }

Answer 2

您不需要扩展此属性，web.config就足够了。请阅读forms Element for authentication。请注意defaultUrl。这就是你需要的东西。

<system.web>
  <authentication mode="Forms">
    <forms defaultUrl="YourUrlGoesHere"/>
  </authentication>
</system.web>

Answer 3

public class CoolAuthorizeAttribute :  AuthorizeAttribute
{
}

Answer 4

我建议你是否只想扩展当前的AuthorizeAttribute并在其上添加自己的授权，而不是覆盖OnAuthorization，只需覆盖AuthorizeCore并将MyCustomAuthorizationHolds条件添加到它。

public class CustomAuthorizeAttribute : AuthorizeAttribute
{
    // This method must be thread-safe since it is called by the thread-safe OnCacheAuthorization() method.
    protected override bool AuthorizeCore(HttpContextBase httpContext)
    {
        if (base.AuthorizeCore(httpContext) && MyCustomAuthorizationHolds)
            return true;

        return false;
    }
}

asp.net mvc添加到AUTHORIZE属性

4 个答案: