例外:在WebAPI 2中实现自定义筛选器时,给定的筛选器必须实现以下一个或多个筛选器接口

Question

我试图建立我的自定义过滤器进行身份验证,但我对当我尝试运行我的WebAPI解决这个问题正在运行:

给定的过滤器实例必须实现以下一个或多个过滤器接口:System.Web.Mvc.IAuthorizationFilter,System.Web.Mvc.IActionFilter,System.Web.Mvc.IResultFilter,System.Web.Mvc.IExceptionFilter,System.Web .Mvc.Filters.IAuthenticationFilter.

FilterConfig类中发生错误:

public class FilterConfig
{
   public static void RegisterGlobalFilters(GlobalFilterCollection filters)
   {
        filters.Add(new HandleErrorAttribute());
        filters.Add(new AuthAttribute());
   }
}

在我尝试将AuthAttribute添加到过滤器的行中.

这是整个AuthAttribute类:

using Examino.Business;
using System;
using System.Collections.Generic;
using System.Diagnostics.Contracts;
using System.IdentityModel;
using System.IdentityModel.Tokens;
using System.Linq;
using System.Net;
using System.Net.Http;
using System.Threading;
using System.Web;
using System.Web.Http;
using System.Web.Http.Controllers;

namespace Examino.API.Filters
{
    public class AuthAttribute : AuthorizeAttribute
    {
        public ITokenProviderService TokenProviderService { get; set; }

        public override void OnAuthorization(HttpActionContext actionContext)
        {
            SetDependencies(actionContext);

            if (!IsAuthorized(actionContext) && !SkipAuthorization(actionContext))
            {
                if (Authenticate(actionContext) == AuthenticationErrors.UNAUTHORIZED)
                {
                    actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.Unauthorized,
                        new HttpResponseMessage(HttpStatusCode.Unauthorized));
                }
                else if (Authenticate(actionContext) == AuthenticationErrors.TOKEN_EXPIRED)
                {
                    actionContext.Response = actionContext.Request.CreateResponse(HttpStatusCode.Unauthorized,
                        //token expired status code?
                        new HttpResponseMessage(HttpStatusCode.Unauthorized));
                }
            }
        }

        private void SetDependencies(HttpActionContext actionContext)
        {
            var requestScope = actionContext.Request.GetDependencyScope();

            if (TokenProviderService == null)
            {
                TokenProviderService = requestScope.GetService(typeof(ITokenProviderService)) as ITokenProviderService;
            }
        }

        private AuthenticationErrors Authenticate(HttpActionContext actionContext)
        {
            IEnumerable<string> authHeaderValues;
            actionContext.Request.Headers.TryGetValues("Authorization", out authHeaderValues);

            try
            {
                if (authHeaderValues != null)
                {
                    string bearerToken = authHeaderValues.ElementAt(0);
                    string token = bearerToken.StartsWith("Bearer ") ? bearerToken.Substring(7) : bearerToken;

                    Thread.CurrentPrincipal = TokenProviderService.ValidateJwtToken(token);
                    if (Thread.CurrentPrincipal != null)
                    {
                        return AuthenticationErrors.AUTHORIZED;
                    }
                }
            }
            catch (SecurityTokenExpiredException)
            {
                return AuthenticationErrors.TOKEN_EXPIRED;
            }
            catch (Exception)
            {
                return AuthenticationErrors.UNAUTHORIZED;
            }

            return AuthenticationErrors.UNAUTHORIZED;
        }

        private bool SkipAuthorization(HttpActionContext actionContext)
        {
            Contract.Assert(actionContext != null);

            return actionContext.ActionDescriptor.GetCustomAttributes<AllowAnonymousAttribute>().Any()
                || actionContext.ControllerContext.ControllerDescriptor.GetCustomAttributes<AllowAnonymousAttribute>().Any();
        }

        private enum AuthenticationErrors
        {
            UNAUTHORIZED,
            TOKEN_EXPIRED,
            AUTHORIZED
        }
    }
}

正如您所看到的,它继承自AuthorizeAttribute类.

这是一个堆栈跟踪:

[InvalidOperationException:给定的过滤器实例必须实现以下一个或多个过滤器接口:System.Web.Mvc.IAuthorizationFilter,System.Web.Mvc.IActionFilter,System.Web.Mvc.IResultFilter,System.Web.Mvc.IExceptionFilter, System.Web.Mvc.Filters.IAuthenticationFilter.]
System.Web.Mvc.GlobalFilterCollection.ValidateFilterInstance(Object instance)+403
System.Web.Mvc.GlobalFilterCollection.AddInternal(Object filter,Nullable`1 order)+26
System.Web. Mvc.GlobalFilterCollection.Add(对象过滤器)+31
Examino.API.FilterConfig.RegisterGlobalFilters(GlobalFilterCollection过滤器)在C:\ examino\src\Examino.API\App_Start\FilterConfig.cs:12
Examino.API.WebApiApplication.Application_Start()在C:\ examino\src\Examino.API\Global.asax.cs:22

[HttpException(0x80004005):给定的过滤器实例必须实现以下一个或多个过滤器接口:System.Web.Mvc.IAuthorizationFilter,System.Web.Mvc.IActionFilter,System.Web.Mvc.IResultFilter,System.Web.Mvc .IExceptionFilter,System.Web.Mvc.Filters.IAuthenticationFilter.]
System.Web.HttpApplicationFactory.EnsureAppStartCalledForIntegratedMode(HttpContext context,HttpApplication app)+540
System.Web.HttpApplication.RegisterEventSubscriptionsWithIIS(IntPtr appContext,HttpContext context,MethodInfo [] handlers)+ 186
System.Web.HttpApplication.InitSpecial(HttpApplicationState状态,MethodInfo []处理程序,IntPtr appContext,HttpContext上下文)+172
System.Web.HttpApplicationFactory.GetSpecialApplicationInstance(IntPtr appContext,HttpContext context)+402
System.Web.Hosting.PipelineRuntime.InitializeApplication (IntPtr appContext)+343

[HttpException(0x80004005):给定的过滤器实例必须实现以下一个或多个过滤器接口:System.Web.Mvc.IAuthorizationFilter,System.Web.Mvc.IActionFilter,System.Web.Mvc.IResultFilter,System.Web.Mvc .IExceptionFilter,System.Web.Mvc.Filters.IAuthenticationFilter.]
System.Web.HttpRuntime.FirstRequestInit(HttpContext的上下文)539
System.Web.HttpRuntime.EnsureFirstRequestInit(HttpContext的上下文)125 System.Web.HttpRuntime.ProcessRequestNotificationPrivate(IIS7WorkerRequest WR ,HttpContext context)+731

即使我实现了例如IAuthenticationFilter接口,无论如何都会抛出相同的异常.

有人有类似的例外吗？我无法在WebAPI中找到更多相关信息.

Answer 1

解决:问题是过滤器注册的地方.在MVC中,您将在FilterConfing类中注册过滤器,但在WebAPI中,您在类的Register方法中执行此操作,WebApiConfig如下所示:

config.Filters.Add(new AuthAttribute());

现在一切都有效.