Arbitrary Asset Loading in Universal Dashboard

AssetLoading.cs

 app.UseStatusCodePages(async context => {
    if (context.HttpContext.Response.StatusCode == 404 && !context.HttpContext.Request.Path.StartsWithSegments("/api"))
    {
        var fileName = context.HttpContext.Request.Path.ToString().Split('/').Last();
        var asset = AssetService.Instance.FindAsset(fileName);
        if (asset != null)
        {
            var response = context.HttpContext.Response;
            response.StatusCode = 200;
            var file = File.ReadAllBytes(asset);
            await response.Body.WriteAsync(file, 0, file.Length);
        }
        else
        {
            var response = context.HttpContext.Response;
            response.StatusCode = 200;
            var filePath = env.ContentRootPath + "/index.html";
            response.ContentType = "text/html; charset=utf-8";
            var file = File.ReadAllText(filePath);
            await response.WriteAsync(file);
        }
    }
    else
    {
        await context.Next(context.HttpContext);
    }
});