如何干扰htaccess重定向url来检查访问者是否登录到wordpress？

Question

I'd like to interfere htaccess redirect url to check if a visitor to that url has logged-in to wordpress or not. If not logged-in redirect to wordpress login page via htaccess.

I've already tried below codes. First one is in public-html folder and the second one into resources/ folder.

1)

Redirect 301 /resources https://external.com/directdownload-

2)

RewriteEngine On
RewriteBase /
RewriteCond %{REQUEST_FILENAME} ^.*(mp3|m4a|pdf|doc|xlsx|docx|xls)$
RewriteCond %{HTTP_COOKIE} !^.*wordpress_logged_in.*$ [NC]
RewriteRule (.*) http://example.com/wp-login.php

The redirection is okay. But visitors outside of wordpress still able to access those links and download the file. How can i prevent them and put a mediator?

Answer 1

RewriteEngine On
RewriteCond %{HTTP_COOKIE} ^.*wordpress_logged_in.*$ [NC]
RewriteRule ^resources/?$ https://external.com/direct-download-link1
 [L,R=301]

This code in htaccess must check the cookie but it send site 500 internal server error.