Simple wordpress php class to download external images to media

wordpress-download-google-drive-image.php

class downloadGoogleDriveImage {

      public static function download_external_url_by_post_id($post_id, $meta_keys){
      
        $result = [];
      
        foreach($meta_keys as $meta_key){
            $url = trim(get_post_meta($post_id, $meta_key, true));
            
            if(empty($url)){
                $result[$meta_key] = false;
                continue;
            }
            
            if(substr( $url, 0, 4 ) !== "http"){
                $result[$meta_key] = false;
                continue;
            }
            
            
            $result[$meta_key] = self::download_image($url);
        }
        
        return $result;
    }

    public static function export_google_url($url) {
        if (strpos($url, "https://drive.google.com/file/d/") === false) {
            return $url;
        }
        $unique_id = str_replace(array("https://drive.google.com/file/d/", "/view?usp=sharing"), array('', ''), $url);
        return "https://drive.google.com/uc?export=download&id=" . $unique_id;
    }
    
    private static function get_file_name_from_disposition($header){
        if (preg_match('/Content-Disposition:.*?filename="(.+?)"/', $header, $matches)) {
            return $matches[1];
        }
        if (preg_match('/Content-Disposition:.*?filename=([^; ]+)/', $header, $matches)) {
            return rawurldecode($matches[1]);
        }
        
        return false;
    }
    
  
    
    public static function download_image($url, $path = ''){
        $image_url = self::export_google_url($url);
            
        $ch = curl_init();
        curl_setopt($ch, CURLOPT_URL, $image_url);
        curl_setopt($ch, CURLOPT_HEADER, false);
        curl_setopt($ch, CURLOPT_RETURNTRANSFER, true);
        curl_setopt($ch, CURLOPT_SSL_VERIFYPEER, false);
        curl_setopt($ch, CURLOPT_FOLLOWLOCATION, true);
        curl_setopt($ch, CURLOPT_HEADER, 1);

        $res = curl_exec($ch);
        
        $header_size = curl_getinfo($ch, CURLINFO_HEADER_SIZE);
        curl_close($ch);
       
        $header = substr($res, 0, $header_size);
        $body = substr($res, $header_size);
    
        $filename = self::get_file_name_from_disposition($header);            
        if(empty($filename)){
            return false;
        }

        $upload_dir = "";
        if(!empty($path)){
            $upload_dir = $path;
        } else{
            $upload_dir = wp_upload_dir()['path'];
        }        
        
        $file = '';
        if (wp_mkdir_p($upload_dir)) {
            $file = $upload_dir . '/' . $filename;
        } else {
            $file = $upload_dir . '/' . $filename;
        }
        
        file_put_contents($file, $body);
        
        $wp_filetype = wp_check_filetype($filename, null);

        $attachment = array(
            'post_mime_type' => $wp_filetype['type'],
            'post_title' => sanitize_file_name($filename),
            'post_content' => '',
            'post_status' => 'inherit'
        );

        $attach_id = wp_insert_attachment($attachment, $file);            
        $attach_data = wp_generate_attachment_metadata($attach_id, $file);            
        wp_update_attachment_metadata($attach_id, $attach_data);
        
        return $attach_id;
    }
    
}