_sent()) {
                            header('Content-Description: File Transfer');
                            header('Content-Type: application/zip');
                            header('Content-Disposition: attachment; filename="' . basename($path) . '"');
                            header('Cache-Control: must-revalidate');
                            header('Content-Length: ' . $size);
                            header('Content-Transfer-Encoding: binary');
                        }

                        if ($size < 1024 * 1024 * 60) {
                            ob_end_clean();
                            readfile($path);
                            exit;
                        } else {
                            ob_end_clean();
                            $download_rate = 1024 * 10;
                            $file = fopen($path, "r");
                            while (!feof($file)) {
                                @set_time_limit(20);
                                // send the current file part to the browser
                                print fread($file, round($download_rate * 1024));
                                // flush the content to the browser
                                ob_flush();
                                flush();

                                // sleep one second
                                sleep(1);
                            }
                            fclose($file);
                            exit;
                        }
                    }
                }
            }
        }
        catch (Exception $error) {
            $message = 'An exception has occurred. class: '.get_class($error).';msg: '.$error->getMessage().';code: '.$error->getCode().';line: '.$error->getLine().';in_file: '.$error->getFile().';';
            error_log($message);
            echo wp_json_encode(array('result'=>'failed','error'=>$message));
            die();
        }
        $admin_url = admin_url();
        echo '<a href="'.esc_url($admin_url).'admin.php?page=WPvivid">file not found. please retry again.</a>';
        die();
    }

    public function set_mail_subject($subject, $task){
        if(!class_exists('WPvivid_mail_report'))
            include_once WPVIVID_PLUGIN_DIR . '/includes/class-wpvivid-mail-report.php';
        $subject=WPvivid_mail_report::create_subject($task);
        return $subject;
    }

    public function set_mail_body($body, $task){
        if(!class_exists('WPvivid_mail_report'))
            include_once WPVIVID_PLUGIN_DIR . '/includes/class-wpvivid-mail-report.php';
        $body=WPvivid_mail_report::create_body($task);
        return $body;
    }

    public function wpvivid_handle_mainwp_action($data){
        $public_interface = new WPvivid_Public_Interface();
        $ret = $public_interface->mainwp_data($data);
        return $ret;
    }

    public function get_zip_object_class($class)
    {
        /*if(version_compare(phpversion(),'8.0.0','>='))
        {
            return 'WPvivid_PclZip_Class_Ex';
        }
        return $class;*/
        return 'WPvivid_PclZip_Class_Ex';
    }

    public function get_backup_path($backup_item, $file_name)
    {
        $path = $backup_item->get_local_path() . $file_name;

        if (file_exists($path)) {
            return $path;
        }
        else{
            $local_setting = get_option('wpvivid_local_setting', array());
            if(!empty($local_setting))
            {
                $path = WP_CONTENT_DIR . DIRECTORY_SEPARATOR . $local_setting['path'] . DIRECTORY_SEPARATOR . $file_name;
            }
            else {
                $path = WP_CONTENT_DIR . DIRECTORY_SEPARATOR . 'wpvividbackups' . DIRECTORY_SEPARATOR . $file_name;
            }
        }
        return $path;
    }

    public function get_backup_folder()
    {
        $local_setting = get_option('wpvivid_local_setting', array());
        if(!empty($local_setting))
        {
            $path = WP_CONTENT_DIR . DIRECTORY_SEPARATOR . $local_setting['path'] . DIRECTORY_SEPARATOR;
        }
        else {
            $path = WP_CONTENT_DIR . DIRECTORY_SEPARATOR . 'wpvividbackups' . DIRECTORY_SEPARATOR;
        }
        return $path;
    }

    public function get_backup_url($backup_item, $file_name)
    {
        $path = $backup_item->get_local_path() . $file_name;

        if (file_exists($path)) {
            return $backup_item->get_local_url() . $file_name;
        }
        else{
            $local_setting = get_option('wpvivid_local_setting', array());
            if(!empty($local_setting))
            {
                $url = content_url().DIRECTORY_SEPARATOR.$local_setting['path'].DIRECTORY_SEPARATOR.$file_name;
            }
            else {
                $url = content_url().DIRECTORY_SEPARATOR.'wpvividbackups'.DIRECTORY_SEPARATOR.$file_name;
            }
        }
        return $url;
    }

    public function wpvivid_check_add_litespeed_server($task_id)
    {
        $litespeed=false;
        if ( isset( $_SERVER['HTTP_X_LSCACHE'] ) && $_SERVER['HTTP_X_LSCACHE'] )
        {
            $litespeed=true;
        }
        elseif ( isset( $_SERVER['LSWS_EDITION'] ) && strpos( $_SERVER['LSWS_EDITION'], 'Openlitespeed' ) === 0 ) {
            $litespeed=true;
        }
        elseif ( isset( $_SERVER['SERVER_SOFTWARE'] ) && $_SERVER['SERVER_SOFTWARE'] == 'LiteSpeed' ) {
            $litespeed=true;
        }

        if($litespeed)
        {
            if($this->wpvivid_log->log_file_handle==false)
            {
                $this->wpvivid_log->OpenLogFile(WPvivid_taskmanager::get_task_options($task_id,'log_file_name'));
            }
            $this->wpvivid_log->WriteLog('LiteSpeed Server.','notice');

            if ( ! function_exists( 'got_mod_rewrite' ) )
            {
                require_once ABSPATH . 'wp-admin/includes/misc.php';
            }

            if(function_exists('insert_with_markers'))
            {
                if(!function_exists('get_home_path'))
                    require_once(ABSPATH . 'wp-admin/includes/file.php');
                $home_path     = get_home_path();
                $htaccess_file = $home_path . '.htaccess';

                if ( ( ! file_exists( $htaccess_file ) && is_writable( $home_path ) ) || is_writable( $htaccess_file ) )
                {
                    if ( got_mod_rewrite() )
                    {
                        $line[]='<IfModule Litespeed>';
                        $line[]='RewriteEngine On';
                        $line[]='RewriteRule .* - [E=noabort:1, E=noconntimeout:1]';
                        $line[]='</IfModule>';
                        insert_with_markers($htaccess_file,'WPvivid Rewrite Rule for LiteSpeed',$line);
                        $this->wpvivid_log->WriteLog('Add LiteSpeed Rule','notice');
                    }
                    else
                    {
                        $this->wpvivid_log->WriteLog('mod_rewrite not found.','notice');
                    }
                }
                else
                {
                    $this->wpvivid_log->WriteLog('.htaccess file not exists or not writable.','notice');
                }
            }
            else
            {
                $this->wpvivid_log->WriteLog('insert_with_markers function not exists.','notice');
            }
        }
    }

    public function wpvivid_check_clear_litespeed_rule($task_id)
    {
        $litespeed=false;
        if ( isset( $_SERVER['HTTP_X_LSCACHE'] ) && $_SERVER['HTTP_X_LSCACHE'] )
        {
            $litespeed=true;
        }
        elseif ( isset( $_SERVER['LSWS_EDITION'] ) && strpos( $_SERVER['LSWS_EDITION'], 'Openlitespeed' ) === 0 ) {
            $litespeed=true;
        }
        elseif ( isset( $_SERVER['SERVER_SOFTWARE'] ) && $_SERVER['SERVER_SOFTWARE'] == 'LiteSpeed' ) {
            $litespeed=true;
        }

        if($litespeed)
        {
            if($this->wpvivid_log->log_file_handle==false)
            {
                $this->wpvivid_log->OpenLogFile(WPvivid_taskmanager::get_task_options($task_id,'log_file_name'));
            }
            $this->wpvivid_log->WriteLog('LiteSpeed Server.','notice');

            if ( ! function_exists( 'got_mod_rewrite' ) )
            {
                require_once ABSPATH . 'wp-admin/includes/misc.php';
            }

            if(function_exists('insert_with_markers'))
            {
                if(!function_exists('get_home_path'))
                    require_once(ABSPATH . 'wp-admin/includes/file.php');
                $home_path     = get_home_path();
                $htaccess_file = $home_path . '.htaccess';

                if ( ( ! file_exists( $htaccess_file ) && is_writable( $home_path ) ) || is_writable( $htaccess_file ) )
                {
                    if ( got_mod_rewrite() )
                    {
                        insert_with_markers($htaccess_file,'WPvivid Rewrite Rule for LiteSpeed','');
                        $this->wpvivid_log->WriteLog('Clear LiteSpeed Rule','notice');
                    }
                    else
                    {
                        $this->wpvivid_log->WriteLog('mod_rewrite not found.','notice');
                    }
                }
                else
                {
                    $this->wpvivid_log->WriteLog('.htaccess file not exists or not writable.','notice');
                }
            }
            else
            {
                $this->wpvivid_log->WriteLog('insert_with_markers function not exists.','notice');
            }
        }
    }
}