+
+ def build_url(sig_base64, url_base64, filename \\ nil) do
+ proxy_url("proxy", sig_base64, url_base64, filename)
+ end
+
+ def build_preview_url(sig_base64, url_base64, filename \\ nil, preview_params \\ []) do
+ uri = proxy_url("proxy/preview", sig_base64, url_base64, filename)
+
+ UriHelper.modify_uri_params(uri, preview_params)
+ end
+
+ def verify_request_path_and_url(
+ %Plug.Conn{params: %{"filename" => _}, request_path: request_path},
+ url
+ ) do
+ verify_request_path_and_url(request_path, url)
+ end
+
+ def verify_request_path_and_url(request_path, url) when is_binary(request_path) do
+ filename = filename(url)
+
+ if filename && not basename_matches?(request_path, filename) do
+ {:wrong_filename, filename}
+ else
+ :ok
+ end
+ end
+
+ def verify_request_path_and_url(_, _), do: :ok
+
+ defp basename_matches?(path, filename) do
+ basename = Path.basename(path)
+ basename == filename or URI.decode(basename) == filename or URI.encode(basename) == filename
+ end