我有一种情况,我需要在操作筛选器中注入一些依赖项,即我的自定义授权属性中的自定义授权提供程序。我偶然发现很多人和帖子都在说我们应该把'属性元数据'和'行为'区分开来。这是有道理的,并且还有一个事实,即filter属性没有通过'DependencyResolver'实例化,所以很难注入依赖关系。IFilterProvider和问题分离
因此,我对代码做了一些重构,并且想知道我是否正确(我使用Castle Windsor作为DI框架)。
首先,我剥我的属性只包含原始数据,我需要
[AttributeUsage(AttributeTargets.Class | AttributeTargets.Method)]
public class MyAuthorizeAttribute : Attribute
{
public string Code { get; set; }
}
我创建了一个自定义授权过滤器,将包含确定当前用户是否具有正确的授权
public class MyAuthorizationFilter : IAuthorizationFilter
{
private IAuthorizationProvider _authorizationProvider;
private string _code;
public MyAuthorizationFilter(IAuthorizationProvider authorizationProvider, string code)
{
Contract.Requires(authorizationProvider != null);
Contract.Requires(!string.IsNullOrWhiteSpace(code));
_authorizationProvider = authorizationProvider;
_code = code;
}
public void OnAuthorization(AuthorizationContext filterContext)
{
if (filterContext == null)
{
throw new ArgumentNullException("filterContext");
}
if (filterContext.HttpContext.Request.IsAuthenticated)
{
BaseController controller = filterContext.Controller as BaseController;
if (controller != null)
{
if (!IsAuthorized(controller.CurrentUser, controller.GetCurrentSecurityContext()))
{
// forbidden
filterContext.RequestContext.HttpContext.Response.StatusCode = 403;
if (filterContext.RequestContext.HttpContext.Request.IsAjaxRequest())
{
filterContext.Result = new RedirectToRouteResult("default", new RouteValueDictionary(new
{
action = "http403",
controller = "error"
}), false);
}
else
{
filterContext.Result = controller.InvokeHttp404(filterContext.HttpContext);
}
}
}
else
{
}
}
else
{
filterContext.Result = new RedirectResult(FormsAuthentication.LoginUrl);
}
}
private bool IsAuthorized(MyUser user, BaseSecurityContext securityContext)
{
bool has = false;
if (_authorizationProvider != null && !string.IsNullOrWhiteSpace(_code))
{
if (user != null)
{
if (securityContext != null)
{
has = _authorizationProvider.HasPermission(user, _code, securityContext);
}
}
}
else
{
has = true;
}
return has;
}
}
的逻辑
最后一部分是创建一个自定义过滤器提供程序,该提供程序将获取此特定属性并实例化我的自定义过滤器,以传递它的依赖项以及所需的任何数据,从属性中提取。
public class MyAuthorizationFilterProvider : IFilterProvider
{
private IWindsorContainer _container;
public MyAuthorizationFilterProvider(IWindsorContainer container)
{
Contract.Requires(container != null);
_container = container;
}
public IEnumerable<Filter> GetFilters(ControllerContext controllerContext, ActionDescriptor actionDescriptor)
{
Type controllerType = controllerContext.Controller.GetType();
var authorizationProvider = _container.Resolve<IAuthorizationProvider>();
foreach (MyAuthorizeAttribute attribute in controllerType.GetCustomAttributes(typeof(MyAuthorizeAttribute), false))
{
yield return new Filter(new MyAuthorizationFilter(authorizationProvider, attribute.Code), FilterScope.Controller, 0);
}
foreach (MyAuthorizeAttribute attribute in actionDescriptor.GetCustomAttributes(typeof(MyAuthorizeAttribute), false))
{
yield return new Filter(new MyAuthorizationFilter(authorizationProvider, attribute.Code), FilterScope.Action, 0);
}
}
}
的最后一步是在Global.asax
FilterProviders.Providers.Add(new MyAuthorizationFilterProvider(_container));
所以我想先注册过滤器供应商,如果我有这个想法的权利;第二,什么可以改善。
嗨,弗朗索瓦,我想出了一个非常类似的解决方案,为你解决同样的问题。我现在正在问自己和你一样的问题。你最终使用这个解决方案吗?随着时间的推移它的任何问题?你有什么建议吗?谢谢。 –