Web Api 过滤器之 AuthorizationFilter 验证过滤器

该过滤器是最先执行的过滤器,即使把它放在最后

API

        [MyActionFilter]
        [MyExceptionFilter]
        [MyAuthorize]
        public void Get()
        {
            Trace.WriteLine("还有谁!!!");
        }

    public class MyActionFilterAttribute : ActionFilterAttribute
    {
        public override void OnActionExecuting(HttpActionContext actionContext)
        {
            Trace.WriteLine("我是 Action 过滤器 OnActionExecuting 方法");
        }
        public override void OnActionExecuted(HttpActionExecutedContext actionExecutedContext)
        {
            Trace.WriteLine("我是 Action 过滤器 OnActionExecuted 方法");
        }
    }

    public class MyAuthorizeAttribute : AuthorizationFilterAttribute
    {
        public override void OnAuthorization(HttpActionContext actionContext)
        {
            Trace.WriteLine("我是 Authorization 过滤器");var headers = actionContext.Request.Headers;
            var authorization = headers.Authorization;
            var validateResult = authorization != null && authorization.Scheme.Equals("mima")&&authorization.Parameter.Equals("");
            if (!validateResult)
            {
                //actionContext.Response = new HttpResponseMessage(System.Net.HttpStatusCode.Unauthorized)
                //{
                //    Content = new StringContent("授权未通过")
                //};

                //从方法名来看,感觉这种写法比上面注释掉的要符合规范一点
                actionContext.Response = actionContext.Request.CreateErrorResponse(HttpStatusCode.Unauthorized, "授权未通过");
            }
        }
    }

客户端调用:

        static void Main(string[] args)
        {
　　　　　　　　
           using (var client = HttpClient())
           {
            client.BaseAddress = new Uri("http://localhost:58254");
            client.DefaultRequestHeaders.Authorization = new System.Net.Http.Headers.AuthenticationHeaderValue("mima","");
            client.GetAsync("api/test/get").ContinueWith(GetResponse);
            Console.WriteLine("这是主线程,我最先被显示出来");
            Console.ReadKey();
　　　　　　}
        }

        private static void GetResponse(Task<HttpResponseMessage> obj)
        {
            var getResult = obj.Result;
            var str = getResult.IsSuccessStatusCode ? "请求成功!" : "请求失败";
            Console.WriteLine(str);
            var readResult = getResult.Content.ReadAsStringAsync();
            Console.WriteLine(readResult.Result);
        }

运行结果:

权限验证基本上每个API都一样,所以都是注册的全局:

    public static class WebApiConfig
    {
        public static void Register(HttpConfiguration config)
        {
            // Web API 配置和服务

            //跨域
            EnableCrossSiteRequests(config);

            //注册过滤器
            config.Filters.Add(new MyAuthorizeAttribute());

......

如果想让某些API不进行验证,比如登录等,则可以进行如下处理:

1.再不需要验证的 Controller 或者 Action 上面打上      [AllowAnonymous]

 [RoutePrefix("api/test")]
    public class TestController : ApiController
    {

        [MyActionFilter]
        [MyExceptionFilter]
        [MyAuthorize]
        [AllowAnonymous]
        public void Get()
        {
            Trace.WriteLine("还有谁!!!");
        }

2.

    public class MyAuthorizeAttribute : AuthorizationFilterAttribute
    {
        public override void OnAuthorization(HttpActionContext actionContext)
        {
            Trace.WriteLine("我是 Authorization 过滤器");

            //检查当前请求的 Action 是否有[AllowAnonymous],有的话则直接返回,不再进行下面的验证
            if (actionContext.ActionDescriptor.GetCustomAttributes<AllowAnonymousAttribute>().Any())
            {
                return;
            }

            //检查当前请求的 Controller 是否有[AllowAnonymous],有的话则直接返回,不再进行下面的验证
            if (actionContext.ControllerContext.ControllerDescriptor.GetCustomAttributes<AllowAnonymousAttribute>().Any())
            {
                return;
            }