smush-mu-fix-png-converted-jpg-404-urls.php

<?php
/**
 * Plugin Name: Smush PNG to JPG URL Fix
 * Description: Fixes post content URLs for images converted from PNG to JPG but still serve PNG url.
 * Jira: SLS-6576
 * Author: Abdoljabbar Bakhshande
 * Author URI: https://wpmudev.com
 * License: GPLv2 or later
 *
 * @package WordPress
 */

if ( ! defined( 'ABSPATH' ) ) {
	exit; // Exit if accessed directly.
}


add_action( 'init', function () {
    if ( ! class_exists('\Smush\Core\Media\Media_Item_Cache') ) {
        return;
    }

    function wdev_replace_url_in_content( $old_url, $new_url ) {
        global $wpdb;
        $wild = '%';
        $old_url_like = $wild . $wpdb->esc_like( $old_url ) . $wild;
        $query = $wpdb->prepare( "SELECT ID, post_content FROM $wpdb->posts WHERE post_content LIKE %s", $old_url_like );
        $rows = $wpdb->get_results( $query );
        
        if ( empty( $rows ) || ! is_array( $rows ) ) {
            return true;
        }

        $update_count = 0;
        foreach ( $rows as $row ) {
            $post_content = $row->post_content;
            $original_content = $post_content;
            $post_content = str_replace( $old_url, $new_url, $post_content );
            
            if ($original_content === $post_content) {
                continue;
            }
            
            $updated = $wpdb->update(
                $wpdb->posts,
                array( 'post_content' => $post_content ),
                array( 'ID' => $row->ID )
            );
            
            if ( $updated ) {
                $update_count++;
            }
            
            clean_post_cache( $row->ID );
        }

        return $update_count === count( $rows );
    }

    add_filter( 'wp_smush_scan_library_slice_handle_attachment', 'smush_png2jpg_fix_urls_during_scan', 10, 2 );

    function smush_png2jpg_fix_urls_during_scan( $slice_data, $attachment_id ) {
        // Check if PNG to JPG conversion is enabled
        $settings = \Smush\Core\Settings::get_instance();
        if ( ! $settings->get( 'png_to_jpg' ) ) {
            return $slice_data;
        }

        // Check for PNG to JPG conversion savings
        $png_jpg_savings = get_post_meta( $attachment_id, 'wp-smush-pngjpg_savings', true );
        if ( ! $png_jpg_savings ) {
            return $slice_data;
        }

        try {
            $media_item = \Smush\Core\Media\Media_Item_Cache::get_instance()->get( $attachment_id );
            if ( ! $media_item ) {
                return $slice_data;
            }

            // Get converted PNG files using the Png2Jpg_Optimization class
            $png2jpg_optimization = new \Smush\Core\Png2Jpg\Png2Jpg_Optimization($media_item);
            $converted_png_files = $png2jpg_optimization->get_converted_png_files();
            if ( ! $converted_png_files || ! is_array( $converted_png_files ) ) {
                return $slice_data;
            }

            $jpg_size_urls = $media_item->get_size_urls();
            
            foreach ( $converted_png_files as $size_key => $png_path ) {
                if ( ! isset( $jpg_size_urls[ $size_key ] ) ) {
                    continue;
                }

                $jpg_url = $jpg_size_urls[ $size_key ];
                $upload_dir = wp_upload_dir();
                $jpg_relative_path = str_replace($upload_dir['baseurl'] . '/', '', $jpg_url);
                
                wdev_replace_url_in_content( $png_path, $jpg_relative_path );
            }

        } catch ( Exception $e ) {
            // Silent fail
        }

        return $slice_data;
    }
});