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<?php

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/**

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* Smush backup class

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* @package Smush\Core\Modules

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namespace Smush\Core\Modules;

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use Smush\Core\Core;

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use Smush\Core\Helper;

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use Smush\Core\Media\Media_Item_Cache;

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use Smush\Core\Media\Media_Item_Optimizer;

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use WP_Smush;

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if ( ! defined( 'WPINC' ) ) {

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die;

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}

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/**

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* Class Backup

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class Backup extends Abstract_Module {

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/**

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* Module slug.

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* @var string

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protected $slug = 'backup';

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/**

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* Key for storing file path for image backup

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* @var string

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private $backup_key = 'smush-full';

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/**

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* Backup constructor.

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public function init() {

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// Handle Restore operation.

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//add_action( 'wp_ajax_smush_restore_image', array( $this, 'restore_image' ) );

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// Handle bulk restore from modal.

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add_action( 'wp_ajax_get_image_count', array( $this, 'get_image_count' ) );

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add_action( 'wp_ajax_restore_step', array( $this, 'restore_step' ) );

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}

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/**

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* Check if the backup file exists.

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* @param int $attachment_id Attachment ID.

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* @param string $file_path Current file path.

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* @return bool True if the backup file exists, false otherwise.

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public function backup_exists( $attachment_id, $file_path = false ) {

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$media_item = Media_Item_Cache::get_instance()->get( $attachment_id );

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return $media_item->can_be_restored();

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}

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/**

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* Generate unique .bak file.

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* @param string $bak_file The .bak file.

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* @param int $attachment_id Attachment ID.

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* @return string Returns a unique backup file.

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private function generate_unique_bak_file( $bak_file, $attachment_id ) {

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if ( strpos( $bak_file, '.bak' ) && Helper::file_exists( $bak_file, $attachment_id ) ) {

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$count = 1;

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$ext = Helper::get_file_ext( $bak_file );

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$ext = ".bak.$ext";

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$file_without_ext = rtrim( $bak_file, $ext );

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$bak_file = $file_without_ext . '-' . $count . $ext;

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while ( Helper::file_exists( $bak_file, $attachment_id ) ) {

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$count++;

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$bak_file = $file_without_ext . '-' . $count . $ext;

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}

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return $bak_file;

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}

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return $bak_file;

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}

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/**

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* Creates a backup of file for the given attachment path.

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* Checks if there is an existing backup, else create one.

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* @param string $file_path File path.

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* @param int $attachment_id Attachment ID.

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* @return void

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public function create_backup( $file_path, $attachment_id ) {

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if ( empty( $file_path ) || empty( $attachment_id ) ) {

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return;

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}

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// If backup not enabled, return.

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if ( ! $this->is_active() ) {

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return;

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}

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/**

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* If [ not compress original ]:

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* if [ is-scaled.file ]:

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* Backup original file.

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* elseif [ no-resize + no-png2jpg ]:

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* We don't need to backup, let user try to use regenerate plugin

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* to restore the compressed thumbnails size.

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* else: continue as compress_original.

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* else:

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* We don't need to backup if we had a backup file for PNG2JPG,

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* or .bak file. But if the .bak file is from third party, we will generate our new backup file.

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* end.

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// We might not need to backup the file if we're not compressing original.

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if ( ! $this->settings->get( 'original' ) ) {

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/**

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* Add WordPress 5.3 support for -scaled images size, and those can always be used to restore.

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* Maybe user doesn't want to auto-scale JPG from WP for some images,

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* so we allow user to restore it even we don't Smush this image.

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if ( false !== strpos( $file_path, '-scaled.' ) && function_exists( 'wp_get_original_image_path' ) ) {

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// Scaled images already have a backup. Use that and don't create a new one.

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$file_path = Helper::get_attached_file( $attachment_id, 'backup' );// Supported S3.

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if ( file_exists( $file_path ) ) {

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/**

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* We do not need an additional backup file if we're not compressing originals.

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* But we need to save the original file as a backup file in the metadata to allow restoring this image later.

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$this->add_to_image_backup_sizes( $attachment_id, $file_path );

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return;

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}

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}

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$mod = WP_Smush::get_instance()->core()->mod;

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// If there is not *-scaled.jpg file, we don't need to backup the file if we don't work with original file.

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if ( ! $mod->resize->is_active() && ! $mod->png2jpg->is_active() ) {

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/**

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* In this case, we can add the meta to save the original file as a backup file,

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* but if there is a lot of images, might take a lot of row for postmeta table,

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* so leave it for user to use a "regenerate thumbnail" plugin instead.

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Helper::logger()->backup()->info( sprintf( 'Not modify the original file [%s(%d)], skip the backup.', Helper::clean_file_path( $file_path ), $attachment_id ) );

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return;

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}

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$should_backup = false;

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// We should backup this image if we can resize it.

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if ( $mod->resize->is_active() && $mod->resize->should_resize( $attachment_id ) ) {

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$should_backup = true;

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}

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// We should backup this image if we can convert it from PNG to JPEG.

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if (

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! $should_backup && $mod->png2jpg->is_active() && Helper::get_file_ext( $file_path, 'png' )

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&& $mod->png2jpg->can_be_converted( $attachment_id, 'full', 'image/png', $file_path )

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) {

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$should_backup = true;

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}

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// As we don't work with the original file, so we don't back it up.

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if ( ! $should_backup ) {

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Helper::logger()->backup()->info( sprintf( 'Not modify the original file [%s(%d)], skip the backup.', Helper::clean_file_path( $file_path ), $attachment_id ) );

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return;

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}

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}

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/**

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* Check if exists backup file from meta,

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* Because we will compress the original file,

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* so we only keep the backup file if there is PNG2JPG or .bak file.

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$backup_path = $this->get_backup_file( $attachment_id, $file_path );

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if ( $backup_path ) {

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/**

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* We will compress the original file so the backup file have to different from current file.

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* And the backup file should be the same folder with the main file.

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if ( $backup_path !== $file_path && dirname( $file_path ) === dirname( $backup_path ) ) {

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// Check if there is a .bak file or PNG2JPG file.

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if ( strpos( $backup_path, '.bak' ) || ( Helper::get_file_ext( $backup_path, 'png' ) && Helper::get_file_ext( $file_path, 'jpg' ) ) ) {

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Helper::logger()->backup()->info( sprintf( 'Found backed up file [%s(%d)].', Helper::clean_file_path( $backup_path ), $attachment_id ) );

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return;

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}

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}

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}

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/**

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* To avoid the conflict with 3rd party, we will generate a new backup file.

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* Because how about if 3rd party delete the backup file before trying to restore it from Smush?

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* We only try to use their bak file while restoring the backup file.

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$backup_path = $this->generate_unique_bak_file( $this->get_image_backup_path( $file_path ), $attachment_id );

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/**

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* We need to save the .bak file to the meta. Because if there is a PNG, when we convert PNG2JPG,

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* the converted file is .jpg, so the bak file will be .bak.jpg not .bak.png

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// Store the backup path in image backup sizes.

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if ( copy( $file_path, $backup_path ) ) {

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$this->add_to_image_backup_sizes( $attachment_id, $backup_path );

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} else {

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Helper::logger()->backup()->error( sprintf( 'Cannot backup file [%s(%d)].', Helper::clean_file_path( $file_path ), $attachment_id ) );

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}

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}

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/**

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* Store new backup path for the image.

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* @param int $attachment_id Attachment ID.

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* @param string $backup_path Backup path.

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* @param string $backup_key Backup key.

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public function add_to_image_backup_sizes( $attachment_id, $backup_path, $backup_key = '' ) {

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if ( empty( $attachment_id ) || empty( $backup_path ) ) {

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return;

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}

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// Get the Existing backup sizes.

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$backup_sizes = $this->get_backup_sizes( $attachment_id );

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if ( empty( $backup_sizes ) ) {

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$backup_sizes = array();

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}

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// Prevent phar deserialization vulnerability.

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if ( false !== stripos( $backup_path, 'phar://' ) ) {

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Helper::logger()->backup()->info( sprintf( 'Prevent phar deserialization vulnerability [%s(%d)].', Helper::clean_file_path( $backup_path ), $attachment_id ) );

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return;

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}

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// Return if backup file doesn't exist.

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if ( ! file_exists( $backup_path ) ) {

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Helper::logger()->backup()->notice( sprintf( 'Back file [%s(%d)] does not exist.', Helper::clean_file_path( $backup_path ), $attachment_id ) );

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return;

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}

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list( $width, $height ) = getimagesize( $backup_path );

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// Store our backup path.

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$backup_key = empty( $backup_key ) ? $this->backup_key : $backup_key;

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$backup_sizes[ $backup_key ] = array(

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'file' => wp_basename( $backup_path ),

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'width' => $width,

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'height' => $height,

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);

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wp_cache_delete( 'images_with_backups', 'wp-smush' );

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update_post_meta( $attachment_id, '_wp_attachment_backup_sizes', $backup_sizes );

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}

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/**

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* Get backup sizes.

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* @param int $attachment_id Attachment ID.

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* @return mixed False or an array of backup sizes.

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public function get_backup_sizes( $attachment_id ) {

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return get_post_meta( $attachment_id, '_wp_attachment_backup_sizes', true );

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}

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/**

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* Back up an image if it hasn't backed up yet.

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* @since 3.9.6

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* @param int $attachment_id Image id.

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* @param string $backup_file File path to back up.

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* Note, we used it to manage backup PNG2JPG to keep the backup file is the original file to avoid conflicts with a duplicate PNG file.

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* If the backup file exists it will rename the original backup file to

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* the new backup file.

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* @return bool True if added this file to the backup sizes, false if the image was backed up before.

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public function maybe_backup_image( $attachment_id, $backup_file ) {

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if ( ! file_exists( $backup_file ) ) {

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return false;

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}

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// We don't use .bak file from 3rd party while backing up.

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$backed_up_file = $this->get_backup_file( $attachment_id, $backup_file );

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$was_backed_up = true;

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if ( $backed_up_file && $backed_up_file !== $backup_file && dirname( $backed_up_file ) === dirname( $backup_file ) ) {

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$was_backed_up = rename( $backed_up_file, $backup_file );

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}

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// Backup the image.

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if ( $was_backed_up ) {

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$this->add_to_image_backup_sizes( $attachment_id, $backup_file );

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}

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return $was_backed_up;

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}

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/**

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* Get the backup file from the meta.

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* @since 3.9.6

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* @param int $id Image ID.

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* @param string $file_path Current file path.

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* @return bool|null Backup file or false|null if the image doesn't exist.

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public function get_backup_file( $id, $file_path = false ) {

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if ( empty( $id ) ) {

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return null;

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}

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if ( empty( $file_path ) ) {

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// Get unfiltered path file.

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$file_path = Helper::get_attached_file( $id, 'original' );

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// If the file path is still empty, nothing to check here.

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if ( empty( $file_path ) ) {

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return null;

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}

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}

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// Initial result.

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$backup_file = false;

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// Try to get the backup file from _wp_attachment_backup_sizes.

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$backup_sizes = $this->get_backup_sizes( $id );

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// Check if we have backup file from the metadata.

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if ( $backup_sizes ) {

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// Try to get the original file first.

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if ( isset( $backup_sizes[ $this->backup_key ]['file'] ) ) {

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$original_file = str_replace( wp_basename( $file_path ), wp_basename( $backup_sizes[ $this->backup_key ]['file'] ), $file_path );

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if ( Helper::file_exists( $original_file, $id ) ) {

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$backup_file = $original_file;

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}

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}

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// Try to check it from legacy original file or from the resized PNG file.

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if ( ! $backup_file ) {

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// If we don't have the original backup path in backup sizes, check for legacy original file path. It's for old version < V.2.7.0.

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$original_file = get_post_meta( $id, 'wp-smush-original_file', true );

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if ( ! empty( $original_file ) ) {

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// For old version < v.2.7.0, we are saving meta['file'] or _wp_attached_file.

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$original_file = Helper::original_file( $original_file );

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if ( Helper::file_exists( $original_file, $id ) ) {

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$backup_file = $original_file;

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// As we don't use this meta key so save it as a full backup file and delete the old metadata.

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WP_Smush::get_instance()->core()->mod->backup->add_to_image_backup_sizes( $id, $backup_file );

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delete_post_meta( $id, 'wp-smush-original_file' );

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}

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}

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// Check the backup file from resized PNG file.

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if ( ! $backup_file && isset( $backup_sizes['smush_png_path']['file'] ) ) {

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$original_file = str_replace( wp_basename( $file_path ), wp_basename( $backup_sizes['smush_png_path']['file'] ), $file_path );

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if ( Helper::file_exists( $original_file, $id ) ) {

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$backup_file = $original_file;

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}

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}

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}

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}

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return $backup_file;

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}

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/**

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* Restore the image and its sizes from backup

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* @param string $attachment_id Attachment ID.

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* @param bool $resp Send JSON response or not.

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* @return bool

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public function restore_image( $attachment_id = '', $resp = true ) {

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// TODO: (stats refactor) handle properly

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// If no attachment id is provided, check $_POST variable for attachment_id.

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if ( empty( $attachment_id ) ) {

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// Check Empty fields.

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if ( empty( $_POST['attachment_id'] ) || empty( $_POST['_nonce'] ) ) {

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wp_send_json_error(

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array(

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'error_msg' => esc_html__( 'Error in processing restore action, fields empty.', 'wp-smushit' ),

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)

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);

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}

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$nonce_value = filter_input( INPUT_POST, '_nonce', FILTER_SANITIZE_SPECIAL_CHARS );

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$attachment_id = filter_input( INPUT_POST, 'attachment_id', FILTER_SANITIZE_NUMBER_INT );

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if ( ! wp_verify_nonce( $nonce_value, "wp-smush-restore-$attachment_id" ) ) {

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wp_send_json_error(

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array(

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'error_msg' => esc_html__( 'Image not restored, nonce verification failed.', 'wp-smushit' ),

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)

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);

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}

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// Check capability.

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if ( ! Helper::is_user_allowed( 'upload_files' ) ) {

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wp_send_json_error(

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array(

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'error_msg' => esc_html__( "You don't have permission to work with uploaded files.", 'wp-smushit' ),

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)

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);

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}

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}

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$attachment_id = (int) $attachment_id;

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$mod = WP_Smush::get_instance()->core()->mod;

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// Set an option to avoid the smush-restore-smush loop.

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set_transient( 'wp-smush-restore-' . $attachment_id, 1, HOUR_IN_SECONDS );

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/**

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* Delete WebP.

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* Run WebP::delete_images always even when the module is deactivated.

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* @since 3.8.0

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$mod->webp->delete_images( $attachment_id );

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// Restore Full size -> get other image sizes -> restore other images.

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// Get the Original Path, supported S3.

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$file_path = Helper::get_attached_file( $attachment_id, 'original' );

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// Store the restore success/failure for full size image.

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$restored = false;

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// Retrieve backup file.

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$backup_full_path = $this->get_backup_file( $attachment_id, $file_path );

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// Is restoring the PNG which is converted to JPG or not.

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$restore_png = false;

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/**

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* Fires before restoring a file.

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* @since 3.9.6

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* @param string|false $backup_full_path Full backup path.

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* @param int $attachment_id Attachment id.

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* @param string $file_path Original unfiltered file path.

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* @hooked Smush\Core\Integrations\s3::maybe_download_file()

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do_action( 'wp_smush_before_restore_backup', $backup_full_path, $attachment_id, $file_path );

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// Finally, if we have the backup path, perform the restore operation.

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if ( ! empty( $backup_full_path ) ) {

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// If the backup file is the same as the main file, we only need to re-generate the metadata.

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if ( $backup_full_path === $file_path ) {

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$restored = true;

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} else {

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// Is real backup file or .bak file.

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$is_real_filename = false === strpos( $backup_full_path, '.bak' );

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$restore_png = Helper::get_file_ext( trim( $backup_full_path ), 'png' ) && ! Helper::get_file_ext( $file_path, 'png' );

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if ( $restore_png ) {

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// Restore PNG full size.

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$org_backup_full_path = $backup_full_path;

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if ( ! $is_real_filename ) {

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// Try to get a unique file name.

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$dirname = dirname( $backup_full_path );

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$new_file_name = wp_unique_filename( $dirname, wp_basename( str_replace( '.bak', '', $backup_full_path ) ) );

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$new_png_file = path_join( $dirname, $new_file_name );

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// Restore PNG full size.

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$restored = copy( $backup_full_path, $new_png_file );

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if ( $restored ) {

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// Assign the new PNG file to the backup file.

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$backup_full_path = $new_png_file;

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}

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} else {

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$restored = true;

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}

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// Restore all other image sizes.

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if ( $restored ) {

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$metadata = $this->restore_png( $attachment_id, $backup_full_path, $file_path );

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$restored = ! empty( $metadata );

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if ( $restored && ! $is_real_filename ) {

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// Reset the backup file to delete it later.

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$backup_full_path = $org_backup_full_path;

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}

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}

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} else {

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// If file exists, corresponding to our backup path - restore.

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if ( ! $is_real_filename ) {

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$restored = copy( $backup_full_path, $file_path );

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} else {

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$restored = true;

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}

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}

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// Remove the backup, if we were able to restore the image.

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