[Smush Pro] - Fix external images source (ex: amazon) converted to not found cdn link

smush-fix-external-images-converted-to-cdn.php

<?php
/**
 * Plugin Name: [Smush Pro] - Fix external images source (ex: amazon) converted to not found cdn link
 * Description: [Smush Pro] - Fix external images source (ex: amazon) converted to not found cdn link - 1153814839375518
 * Author: Thobk @ WPMUDEV
 * Author URI: https://premium.wpmudev.org
 * License: GPLv2 or later
 */
if ( ! defined( 'ABSPATH' ) ) {
	exit;
}

add_action( 'after_setup_theme', 'wpmudev_smpro_external_image_source_converted_to_not_found_cdn_link_func', 100 );

function wpmudev_smpro_external_image_source_converted_to_not_found_cdn_link_func() {
	if( defined('WP_SMUSH_VERSION') && class_exists( 'Smush\WP_Smush' ) ){
		// return if disabled cdn
		if( ! Smush\Core\Settings::get_instance()->get('cdn') ) return;

		class WPMUDEV_SMPro_External_Images_Converted_2_404_CDN{
			private $cdn_core;
			public function __construct(){
				add_filter( 'smush_cdn_skip_image', array( $this, 'smush_cdn_skip_image'), 10, 2 );
			}

			public function cdn_core(){
				if( is_null( $this->cdn_core ) ){
					$this->cdn_core = Smush\WP_Smush::get_instance()->core()->mod->cdn;
				}

				return $this->cdn_core;
			}

			public function smush_cdn_skip_image( $skip, $src ){
				if( ! $this->cdn_core()->is_supported_path( $src ) ){
					$skip = true;
				}
				return $skip;
			}
		}

		$run = new WPMUDEV_SMPro_External_Images_Converted_2_404_CDN;
	}
}