ASP.NET Web Api 2 - Log every incoming request for specific actions

Question

I am working with ASP.NET Web Api 2. I have written two Filter Attributes which check every incoming request for specific headers and if the header keys are not present they return Unauthorized response to users.

This is what I am doing (one of the filters):

public class HeaderFilterAttribute : AuthorizationFilterAttribute { public override void OnAuthorization(HttpActionContext actionContext) { var req = actionContext.Request; if (! req.Headers.Contains("api-key") || req.Headers.GetValues("api-key") == null) { actionContext.Response = req.CreateResponse(HttpStatusCode.Unauthorized); actionContext.Response.Content = new StringContent("Token required", Encoding.UTF8, "text/html"); } } }

Now If the request contains valid header keys and they have reached the correct action method or endpoint, I want to log certain details about the request.

What is the right way to create a filter attribute for this scenario? Which method this filter attribute will override? Or can I achieve the desired result without creating a filter attribute. I think it will not make sense to override OnAuthorization()

Jasen · Accepted Answer · 2016-01-16 04:58:06Z

Make a new filter extending ActionFilterAttribute. Your authorization filters will always run first then the logging filter logs your accepted requests.

public class MyLogFilterAttribute : ActionFilterAttribute { public override OnActionExecuting(HttpActionContext actionContext) { // log info base.OnActionExecuting(actionContext); } }

Add to a base controller class to log all actions.

[HeaderFilter] [MyLogFilter] public abstract class BaseApiController : ApiController { } public class MyApiController : BaseApiController { }

@HimalayaGarg that's out-of-scope for this question. But it would depend on your logger and DI framework. I'm sure it's been answered on SO before.

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