Web API 动态启用/禁用响应

Question

我希望能够根据用户定义的布尔值打开/关闭我的所有 Web api 路由。目前这可以来自 Web.config。如果此标志设置为 false，我希望能够使用错误消息响应任何请求（任何和所有路由天气是否有效）——“..api is disabled...”

这里只是玩弄用一些伪代码覆盖控制器的 Initialize 方法的想法。我想这会假设被请求的路由在我想要响应任何请求的地方是有效的。我什至不确定是否可以将 IsEnabled 属性注入到 Configuration.Properties 集合中。寻找任何关于如何关闭路由并根据设置做出相应响应的建议。

谢谢

 public class MyController : ApiController
    {
        protected override void Initialize(HttpControllerContext controllerContext)
        {
            if (!Convert.ToBoolean(controllerContext.Configuration.Properties["IsEnabled"]))
            {
                throw new HttpResponseException(Request.CreateErrorResponse(HttpStatusCode.InternalServerError, "Api is currently disabled."));
            }
            base.Initialize(controllerContext);
        }

编辑：可能使用 HttpConfiguration.MessageHandlers.Add() 来拦截所有请求？

Answer 1

尝试自定义DelegatingHandler

internal class BaseApiHandler : DelegatingHandler
{
    protected async override Task<HttpResponseMessage> SendAsync(HttpRequestMessage request, System.Threading.CancellationToken cancellationToken)
    {
        HttpResponseMessage response = new HttpResponseMessage(HttpStatusCode.Forbidden);

        var allowRequest = //web config value

        // if request is allowed then let it through to the next level
        if(allowRequest)
            response = await base.SendAsync(request, cancellationToken);

        // set response message or reasonphrase here

        // return default result - forbidden
        return response;
   }
}

编辑您的 webapiconfig.cs 以在顶部包含此路由

config.Routes.MapHttpRoute(
    name: "Default",
    routeTemplate: "{*path}",
    handler: HttpClientFactory.CreatePipeline
    (
        innerHandler: new HttpClientHandler(),
        handlers: new DelegatingHandler[] { new BaseApiHandler() }
    ),
    defaults: new { path = RouteParameter.Optional },
    constraints: null
);