Description

When testing a filter to change the directory of downloaded fonts, the fonts are not installed and return an error instead. Using the example in #57697 as a base.

Example code:

/**
 * Define a custom font directory for the WP Font Library.
 */
function alter_wp_fonts_dir( $defaults ) {
	$wp_upload_dir = wp_get_upload_dir();
	$uploads_basedir = $wp_upload_dir['basedir'];
	$uploads_baseurl = $wp_upload_dir['baseurl'];

	$fonts_dir = $uploads_basedir . '/fonts';
	// Generate the URL for the fonts directory from the font dir.
	$fonts_url = str_replace( $uploads_basedir, $uploads_baseurl, $fonts_dir );

	$defaults['path'] = $fonts_dir;
	$defaults['url']  = $fonts_url;

	return $defaults;
}
add_filter( 'font_dir', 'alter_wp_fonts_dir' );

Step-by-step reproduction instructions

1. Hook the code above to a function bootstrapped on init.
2. Navigate to the Font Library
3. Navigate to Install Fonts
4. Pick a font to install
5. Click the Install button

Screenshots, screen recording, code snippet

Loom recording

Console:

Environment info

• WordPress 6.5-alpha-57531
• PHP: tested on 7.4.33, 8.1.18, 8.2.5
• Gutenberg: tested on 17.6.1, 17.6.2, 17.6.4
• MacOS Sonoma 14.2.1
• Google Chrome 121.0.6167.85

Please confirm that you have searched existing issues in the repo.

Yes

Please confirm that you have tested with all plugins deactivated except Gutenberg.

Yes