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function ecp_save_post($post_id, $post) {
  global $wpdb;
  if($post->post_status == 'publish') {
    $p   = '/<img.*[\s]src=[\"|\'](.*)[\"|\'].*>/iU';
    $num = preg_match_all($p, $post->post_content, $matches);
    if ($num) {
      $wp_upload_dir = wp_upload_dir();
      set_time_limit(0);
      $ch = curl_init();
      curl_setopt($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_MAXREDIRS,20);
      curl_setopt($ch, CURLOPT_CONNECTTIMEOUT, 30);

      $ecp_options = $_SERVER['HTTP_HOST'];
      foreach ($matches[1] as $src) {
        if (isset($src) && strpos($src, $ecp_options) === false) {
          $file_info = wp_check_filetype(basename($src), null);
          if ($file_info['ext'] == false) {
            date_default_timezone_set('PRC');
            $file_name = date('YmdHis-').dechex(mt_rand(100000, 999999)).'.tmp';
          } else {
            $file_name = dechex(mt_rand(100000, 999999)) . '-' . basename($src);
          }
          curl_setopt($ch, CURLOPT_URL, $src);
          $file_path = $wp_upload_dir['path'] . '/' . $file_name;
          $img = fopen($file_path, 'wb');
          curl_setopt($ch, CURLOPT_FILE, $img);
          $img_data  = curl_exec($ch);
          fclose($img);

          if (file_exists($file_path) && filesize($file_path) > 0) {
            $t   = curl_getinfo($ch, CURLINFO_CONTENT_TYPE);
            $arr = explode('/', $t);
            if (pathinfo($file_path, PATHINFO_EXTENSION) == 'tmp') {
              $file_path = ecp_handle_ext($file_path, $arr[1], $wp_upload_dir['path'], $file_name, 'tmp');
            } elseif (pathinfo($file_path, PATHINFO_EXTENSION) == 'webp') {
              $file_path = ecp_handle_ext($file_path, $arr[1], $wp_upload_dir['path'], $file_name, 'webp');
            }
            $post->post_content  = str_replace($src, $wp_upload_dir['url'] . '/' . basename($file_path), $post->post_content);
            $attachment = ecp_get_attachment_post(basename($file_path), $wp_upload_dir['url'] . '/' . basename($file_path));
            $attach_id = wp_insert_attachment($attachment, ltrim($wp_upload_dir['subdir'] . '/' . basename($file_path), '/'), 0);
            $attach_data = wp_generate_attachment_metadata($attach_id, $file_path);
            $ss = wp_update_attachment_metadata($attach_id, $attach_data);
          }
        }
      }
      curl_close($ch);
      $wpdb->update( $wpdb->posts, array('post_content' => $post->post_content), array('ID' => $post->ID));
    }
  }
}

function ecp_handle_ext($file, $type, $file_dir, $file_name, $ext) {
  switch ($ext) {
    case 'tmp':
      if (rename($file, str_replace('tmp', $type, $file))) {
        if ('webp' == $type) {
          return ecp_image_convert('webp', 'jpeg', $file_dir . '/' . str_replace('tmp', $type, $file_name));
        }
        return $file_dir . '/' . str_replace('tmp', $type, $file_name);
      }
    case 'webp':
      if ('webp' == $type) {
        return ecp_image_convert('webp', 'jpeg', $file);
      } else {
        if (rename($file, str_replace('webp', $type, $file))) {
          return $file_dir . '/' . str_replace('webp', $type, $file_name);
        }
      }
    default:
      return $file;
  }
}

function ecp_image_convert($from='webp', $to='jpeg', $image) {
  $im = imagecreatefromwebp($image);
  if (imagejpeg($im, str_replace('webp', 'jpeg', $image), 100)) {
    try {
      unlink($image);
    } catch (Exception $e) {
      $error_msg = sprintf('Error removing local file %s: %s', $image,
        $e->getMessage());
      error_log($error_msg);
    }
  }
  imagedestroy($im);

  return str_replace('webp', 'jpeg', $image);
}

function ecp_get_attachment_post($filename, $url) {
  $file_info  = wp_check_filetype($filename, null);
  return array(
    'guid'           => $url,
    'post_type'      => 'attachement',
    'post_mime_type' => $file_info['type'],
    'post_title'     => preg_replace('/\.[^.]+$/', '', $filename),
    'post_content'   => '',
    'post_status'    => 'inherit'
  );
}
add_action('save_post', 'ecp_save_post', 120, 2);