“安全意识”行动链接?

这是从MVCSitemap项目中提取的一些代码,并进行了修改以供我自己使用。如果我没记错的话,这个代码已经为MVC2修改过了,其中一些函数可能需要重新移植到MVC1。

将MVC和FormsAuthentication混合在一起是一种不错的做法,MVC的默认身份验证方法是围绕现有的ASP.NET安全基础结构构建的。

用于确定用户是否具有权限的代码:

public static class SecurityTrimmingExtensions 
{

    public static bool HasActionPermission( this HtmlHelper htmlHelper, string actionName, string controllerName )
    {
        //if the controller name is empty the ASP.NET convention is:
        //"we are linking to a different controller
        ControllerBase controllerToLinkTo = string.IsNullOrEmpty(controllerName) 
                                                ? htmlHelper.ViewContext.Controller
                                                : GetControllerByName(htmlHelper, controllerName);

        var controllerContext = new ControllerContext(htmlHelper.ViewContext.RequestContext, controllerToLinkTo);

        var controllerDescriptor = new ReflectedControllerDescriptor(controllerToLinkTo.GetType());

        var actionDescriptor = controllerDescriptor.FindAction(controllerContext, actionName);

        return ActionIsAuthorized(controllerContext, actionDescriptor);
    }


    private static bool ActionIsAuthorized(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
    {
        if (actionDescriptor == null)
            return false; // action does not exist so say yes - should we authorise this?!

        AuthorizationContext authContext = new AuthorizationContext(controllerContext);

        // run each auth filter until on fails
        // performance could be improved by some caching
        foreach (IAuthorizationFilter authFilter in actionDescriptor.GetFilters().AuthorizationFilters)
        {
            authFilter.OnAuthorization(authContext);

            if (authContext.Result != null)
                return false;
        }

        return true;
    }

    private static ControllerBase GetControllerByName(HtmlHelper helper, string controllerName)
    {
        // Instantiate the controller and call Execute
        IControllerFactory factory = ControllerBuilder.Current.GetControllerFactory();

        IController controller = factory.CreateController(helper.ViewContext.RequestContext, controllerName);

        if (controller == null)
        {
            throw new InvalidOperationException(

                String.Format(
                    CultureInfo.CurrentUICulture,
                    "Controller factory {0} controller {1} returned null",
                    factory.GetType(),
                    controllerName));

        }

        return (ControllerBase)controller;
    }

}

HTML帮助程序

public static class SecurityTrimmedLink
{
    public static MvcHtmlString SecurityTrimmedActionLink(this HtmlHelper htmlHelper, string linkName, string actionName)
    {
        return htmlHelper.HasActionPermission(actionName, "")
                   ? htmlHelper.ActionLink(linkName, actionName)
                   : MvcHtmlString.Create("");
    }        

    public static MvcHtmlString SecurityTrimmedActionLink(this HtmlHelper htmlHelper, string linkName, string actionName, RouteValueDictionary routeValueDictionary )
    {
        return htmlHelper.HasActionPermission(actionName, "")
                   ? htmlHelper.ActionLink(linkName, actionName, routeValueDictionary)
                   : MvcHtmlString.Create("");
    }

    public static MvcHtmlString SecurityTrimmedActionLink(this HtmlHelper htmlHelper, string linkName, string actionName, object routeValues, object htmlAttributes )
    {
        return htmlHelper.HasActionPermission(actionName, "")
                   ? htmlHelper.ActionLink(linkName, actionName, routeValues, htmlAttributes)
                   : MvcHtmlString.Create("");
    }

    public static MvcHtmlString SecurityTrimmedActionLink(this HtmlHelper htmlHelper, string linkName, string actionName, string controllerName)
    {
        return htmlHelper.HasActionPermission(actionName, controllerName)
                   ? htmlHelper.ActionLink(linkName, actionName, controllerName)
                   : MvcHtmlString.Create("");
    }

    public static MvcHtmlString SecurityTrimmedActionLink(this HtmlHelper htmlHelper, string linkName, string actionName, string controllerName, object routeValues, object htmlAttributes)
    {
        return htmlHelper.HasActionPermission(actionName, controllerName)
                   ? htmlHelper.ActionLink(linkName, actionName, controllerName, routeValues, htmlAttributes)
                   : MvcHtmlString.Create("");
    }
}

警告:这在MVC 5中不起作用,因为对findaction()的调用从不返回操作描述符

我试图找到这个问题,但却找不到,最后我编了一个解决方案。:(

JFAR的代码在很大程度上对我有用,但我必须对MVC4做一些修改。这是唯一必须更改的方法:

private static bool ActionIsAuthorized(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
{
    if (actionDescriptor == null)
        return false; // action does not exist so say yes - should we authorise this?!

    AuthorizationContext authContext = new AuthorizationContext(controllerContext, actionDescriptor);

    // run each auth filter until on fails
    // performance could be improved by some caching
    foreach (var filter in FilterProviders.Providers.GetFilters(controllerContext, actionDescriptor))
    {
        var authFilter = filter.Instance as IAuthorizationFilter;

        if (authFilter == null)
            continue;

        authFilter.OnAuthorization(authContext);

        if (authContext.Result != null)
            return false;
    }

    return true;
}

区域部分比添加一些重载要复杂一些。 useNamespaceFallback hack不起作用,因为当您在不同区域具有相同名称的控制器时,您将实例化错误的控制器。

您需要有一种方法来获得该区域的正确命名空间

否则这个

 IController controller = factory.CreateController(helper.ViewContext.RequestContext, controllerName); 

会出错的。

目前我在视图中有这样的链接

@Html.SecurityTrimmedActionLink("this link", "Index", "Home",new {Area=string.Empty});   
@Html.SecurityTrimmedActionLink("this link", "Index", "FunctionAdministration", new   {Area="Administration" }, null);

里面

public static bool HasActionPermission(this HtmlHelper htmlHelper, string actionName, string controllerName, object area)

当区域为空时,我将获取该区域的命名空间或默认命名空间。

private static string GetNamespaceForArea(string area, RouteCollection routeColl)
    {
        string ns = string.Empty;
        foreach (RouteBase routeBase in routeColl)
        {
            if (routeBase.GetType() == (typeof (Route)))
            {
                Route route = (Route) routeBase;
                RouteValueDictionary dataTokens = route.DataTokens;
                ;
                if (area != null)
                {
                    if (dataTokens.ContainsKey("area"))
                    {
                        if (area.Equals(dataTokens["area"]))
                        {
                            ns = (string) ((string[]) dataTokens["Namespaces"])[0];
                            break;
                        }
                    }
                    else
                    {
                        if (area.Equals(string.Empty))
                        {
                            ns = (string) ((string[]) dataTokens["Namespaces"])[0];
                            break;
                        }
                    }
                }
            }
        }
        return ns;
    }

例如,您需要在GlobalSAX中设置路由中的默认命名空间(默认ns“actionLinkTest.controllers”):

routes.MapRoute(
            "Default", // Route name
            "{controller}/{action}/{id}", // URL with parameters
            new { controller = "Home", action = "Index", id = UrlParameter.Optional } // Parameter defaults
            , new[] { "ActionLinkTest.Controllers" }
        );

使用它根据类型名称创建控制器:

ControllerBase controllerToLinkTo = string.IsNullOrEmpty(controllerName) ? htmlHelper.ViewContext.Controller :(ControllerBase) Activator.CreateInstance(Type.GetType(type));

在global.asax中定义区域

areaRegistration.Add("Administration","Areas.Administration");