Custom module for converting webp to jpg on node save in Drupal 7

So, the problem is as a result of the import of node, images paths in webp format were imported into the image field. The problem is that for Drupal 7 there are practically no solutions how to make the existing filled fields of images with the webp format work. Reference to manually - excluded. To solve, we create a custom module, which during the rebuilding of the node converts the image of the webp into the format of the jpg.

Create in module folder - site/all/module folder custom/webp_to_jpg. Inside create file webp_to_jpg.info

webp_to_jpg.infoname = WebP to JPG Converter
description = Converts WebP images to JPG on node save.
core = 7.x
package = Custom

and webp_to_jpg.module

<?php

/**
 * Implements hook_node_presave().
 */
function webp_to_jpg_node_presave($node) {
  if ($node->type == 'device') {
    $field_items = field_get_items('node', $node, 'field_image');
    if (!empty($field_items)) {
      foreach ($field_items as $index => $item) {
        $file = file_load($item['fid']);
        if (pathinfo($file->uri, PATHINFO_EXTENSION) === 'webp') {
          $converted_file = webp_to_jpg_convert($file);
          if ($converted_file) {
            // Заменить файл в поле
            $node->field_image[LANGUAGE_NONE][$index] = (array) $converted_file;
          }
        }
      }
    }
  }
}

/**
 * Converts a WebP file to a JPG file.
 * 
 * @param object $file
 *   File object to convert.
 * 
 * @return object
 *   The converted file object.
 */
function webp_to_jpg_convert($file) {
  $image = imagecreatefromwebp($file->uri);
  if ($image === FALSE) {
    return NULL;
  }

  $new_uri = preg_replace('/\.webp$/', '.jpg', $file->uri);
  imagejpeg($image, $new_uri, 100);
  imagedestroy($image);

  $file_info = image_get_info($new_uri);
  $new_file = file_save_data(file_get_contents($new_uri), $new_uri, FILE_EXISTS_REPLACE);

  return $new_file;
}

Where 'device' is node type that we need and 'field_image' is field with image.

Thus, now with a simple node rebuilding, all images from the field_image field will be converted into the jpg format.