I'm trying to create a custom controller for media for adding an extra http-header to files based on a setting in the backend.

I found this article http://umbracodevelopers.sdesign1dev.co.uk/2015/6/18/securing-the-media-section/ which describes a method for hijacking the media route with a custom controller. I implemented this before in Umbraco 6 and this method works perfect but when I try to implement this in Umbraco 7, I can't get it to work.

I already tried to inherit my custom controller from PluginController instead of Controller like in the article but it doesn't hit the custom action.

It does work when I leave out the image-extension in the path, so the issue is probably related to the handling of static files, but I was in the assumption that RouteTable.Routes.RouteExistingFiles = true; would solve this.

~/App_Code/StartupHandler.cs

public class StartupHandler : IApplicationEventHandler
{
    public void OnApplicationStarted(UmbracoApplicationBase umbracoApplication, ApplicationContext applicationContext)
    {
        RouteTable.Routes.RouteExistingFiles = true;

        //Create a custom routes
        RouteTable.Routes.MapRoute(
            "MediaRoute",
            "Media/{id}/{file}",
            new
            {
                controller = "Media",
                action = "Index",
                id = UrlParameter.Optional,
                file = UrlParameter.Optional
            }
        );
    }

    public void OnApplicationInitialized(
        UmbracoApplicationBase umbracoApplication,
        ApplicationContext applicationContext)
    {
    }

    public void OnApplicationStarting(
        UmbracoApplicationBase umbracoApplication,
        ApplicationContext applicationContext)
    {
    }
}

~/Controllers/MediaController.cs

public class MediaController : PluginController
{
    public MediaController()
        : this(UmbracoContext.Current)
    {
    }

    public MediaController(UmbracoContext umbracoContext)
        : base(umbracoContext)
    {
    }

    public ActionResult Index(string id, string file)
    {
        string mediaPath = "/media/" + id + "/" + file;

        IMediaService mediaService = ApplicationContext.Current.Services.MediaService;

        IMedia media = mediaService.GetMediaByPath(mediaPath);

        if (media != null)
        {
            bool hideFromSearchEngines = media.GetValue<bool>("hideFromSearchEngines");

            if (hideFromSearchEngines == true)
            {
                System.Web.HttpContext.Current.Response.AddHeader("X-Robots-Tag", "noindex, nofollow");
            }

            FileStream fileStream = new FileStream(Server.MapPath(mediaPath), FileMode.Open);

            return new FileStreamResult(fileStream, MimeMapping.GetMimeMapping(file));
        }
        else
        {
            return HttpNotFound();
        }
    }
}