WP_REST_Themes_Controller::check_read_active_theme_permission()

	protected function check_read_active_theme_permission() {
		if ( current_user_can( 'edit_posts' ) ) {
			return true;
		}

		foreach ( get_post_types( array( 'show_in_rest' => true ), 'objects' ) as $post_type ) {
			if ( current_user_can( $post_type->cap->edit_posts ) ) {
				return true;
			}
		}

		return new WP_Error(
			'rest_cannot_view_active_theme',
			__( 'Sorry, you are not allowed to view the active theme.' ),
			array( 'status' => rest_authorization_required_code() )
		);
	}