如何在标准 .Net Web API 中使用 Prometheus mapPath 上的 ActionFilter

Question

我想过滤可以路由到 Prometheus 指标的客户端 IP 范围。所以在启动时我有

    public void Configuration(IAppBuilder app)
    {
        ConfigureAuth(app);            
        app.UsePrometheusServer(q =>
        {
            q.MapPath = "/metrics";
        });
        app.UseWebApi(config);
    }

这是我的自定义操作筛选器类

public class IpFilter : ActionFilterAttribute
{
    public override void OnActionExecuting(ActionExecutingContext actionContext)
    {            
        string clinetIP = GetClientIpAddress(actionContext.HttpContext.Items["MS_HttpRequestMessage"] as HttpRequestMessage);
        if (IpAllowed(clinetIP))  
            base.OnActionExecuting(actionContext);
    }       

但是我不知道如何使用 IpFilter，因为它不能用作控制器操作的属性。我尝试通过使用 owin 添加中间件来使用它，但下一个。调用无法正常工作

    public void Configuration(IAppBuilder app)
    {     
        app.Map("/metrics", metricsApp =>
        {             
           metricsApp.Use<TestIpMid>(deniedIps);
           metricsApp.UsePrometheusServer(q => q.MapPath = "/metrics");              
        });
        app.UsePrometheusServer(q =>
        {
            q.MapPath = "/metrics";
        });
        app.UseWebApi(config);
    }

这是中间件：

    public class TestIpMid : OwinMiddleware
{
    private readonly HashSet<string> _deniedIps;
    public TestIpMid(OwinMiddleware next, HashSet<string> deniedIps) : base(next)
    {
        _deniedIps = deniedIps;
    }
    public override async Task Invoke(IOwinContext context)
    {
        var ipAddress = context.Request.RemoteIpAddress;
        if (_deniedIps.Contains(ipAddress))
        {
            context.Response.StatusCode = 403;
            return;
        }           
        await Next.Invoke(context);            
    }
}

请帮助我：'（

Answer 1

这个解决方案对我有用，但我想到的其他方法不起作用

    public void Configuration(IAppBuilder app)
    {
        ConfigureAuth(app);
        var config = new HttpConfiguration();
        var allowedIps = ProtectedSettings.Read(ProtectedSettings.protheusIpWhitelist).Split(new string[] { "," }, StringSplitOptions.RemoveEmptyEntries);             
        app.Use(async (Context, next) =>
        {
            var ipAddress = Context.Request.RemoteIpAddress;
            if ((!allowedIps.Contains(ipAddress)) && Context.Request.Path.Value == "/metrics")
            {
                Context.Response.StatusCode = 403;
                return;
            }
            await next.Invoke();
        });
        app.UsePrometheusServer(q =>
        {
            q.MapPath = "/metrics";
        });
        app.UseWebApi(config);
    }