WordPress change upload_dir for specific files to root dont work

Question

I would like to place PDF files uploaded via the media library in a separate folder in the root directory. I have already developed a filter for this and the files are stored correctly. However, the permalink of the file is wrong and contains the URL as well as the path.

I use the following source code (excerpt)

$customdir = 'custom-uploads';
$path['path']    = wp_normalize_path( ABSPATH . $customdir );
$path['url']     = home_url( '/' . $customdir );
$path['subdir']  = "/" . $customdir;
$path['basedir'] = $path['path'];
$path['baseurl'] = $path['url'];

The object (path) before the filter looks like this:

[22-Apr-2022 13:59:12 UTC] Array
(
    [path] => /var/www/srv/apps/apptest01/wp-content/uploads/2022/04
    [url] => https://example.com/wp-content/uploads/2022/04
    [subdir] => /2022/04
    [basedir] => /var/www/srv/apps/apptest01/wp-content/uploads
    [baseurl] => https://example.com/wp-content/uploads
    [error] => 
)

Before the return:

[22-Apr-2022 13:59:12 UTC] Array
(
    [path] => /var/www/srv/apps/apptest01/custom-uploads
    [url] => https://example.com/custom-uploads
    [subdir] => /custom-uploads
    [basedir] => /var/www/srv/apps/apptest01/custom-uploads
    [baseurl] => https://example.com/custom-uploads
    [error] => 
)

But the permalink of the file is now as follows:

https://example.com/wp-content/uploads//var/www/srv/apps/apptest01/custom-uploads/file.pdf

Can anyone help me with this? Thanks in advance!

Answer 1

You can register a filter for the wp_get_attachment_url function to right the URL composed by Wordpress.

/**
 * Filters the attachment URL.
 *
 * @param string $url           URL for the given attachment.
 * @param int    $attachment_id Attachment post ID.
 */
function right_composed_attachment_url( $url, $attachment_id ) {
    $wrong_base_url = 'https://example.com/wp-content/uploads//var/www/srv/apps/apptest01/custom-uploads';
    $uploads = wp_get_upload_dir();
    $correct_base_url = $uploads['baseurl'];
    $custom_upload_has_wrong_base_url = strpos( $c, $wrong_base_url ) !== false;
    
    if ( $custom_upload_has_wrong_base_url ) {
      return str_replace( $wrong_base_url, $correct_base_url, $url );
    }

    return $url;
}
add_filter( 'wp_get_attachment_url', 'right_composed_attachment_url' );