ALE.Http.Static.Directory C# (CSharp) Method

        public static Action<IContext, Action> Directory(string path)
        {
            if (String.IsNullOrWhiteSpace(path))
            {
                path = "/";
            }

            var staticRoot = Path.GetFullPath(Path.Combine(AppDomain.CurrentDomain.BaseDirectory, path.Replace("/", "\\").TrimStart('\\')));

            return (context, next) =>
                       {
                           var res = context.Response;
                           var req = context.Request;
                           var absPath = req.Url.AbsolutePath;
                           var unUrlified = Uri.UnescapeDataString(absPath.Replace("/", "\\")).TrimStart('\\');
                           var filePath = Path.Combine(staticRoot, unUrlified);
                           var fullPath = Path.GetFullPath(filePath);
                           if (!fullPath.StartsWith(staticRoot))
                           {
                               throw new InvalidOperationException("File path disallowed.");
                           }
                           if (File.Exists(filePath))
                           {
                               FileSystem.File.ReadAllBytes(filePath, (ex, buffer) =>
                                                               {
                                                                   if (ex != null)
                                                                   {
                                                                       res.StatusCode = 500;
                                                                       res.StatusDescription = "Internal server error.";
                                                                   } else
                                                                   {
                                                                       res.StatusCode = 200;
                                                                       res.ContentType = GetMimeType(filePath);
                                                                       res.Write(buffer);
                                                                   }
                                                                   res.Send();
                                                               });
                           } else
                           {
                               next();
                           }
                       };
        }