image_upload.php

  public function image_upload($image_path, $filename, $is_image_name_set = FALSE) {
  $output = [];
  $fid = ParagraphImportProcessParagraph::getFidFromHashing($image_path, $this->configuration);

  if (!$fid) {
    $fid = ParagraphImportProcessParagraph::create_image($filename, $image_path, $this->configuration);
  }
  
  if ($fid) {
    $output = ParagraphImportProcessParagraph::attach_image_info($fid, '', '');
  }
  return $output;
}
  
  public function getFidFromHashing($filename, $configuration) {
    $image_hashing = isset($configuration['image_hashing']['validate']) ? $configuration['image_hashing']['validate'] : '';
    if (!$image_hashing) {
      // We have to check from row if image_hashing configuration is set globally.
      $row = isset($configuration['row']) ? $configuration['row'] : '';
      if (is_object($row)) {
        $image_hashing = $row->getSourceProperty('image_hashing');
      }
    }
    if ($image_hashing) {
      $algorithm = (isset($configuration['image_hashing']['algorithm'])) ? $configuration['image_hashing']['algorithm'] : 'md5';
      $hash_key = ParagraphImportProcessParagraph::getFileHashKey($algorithm, $filename);
      $fid = ParagraphImportProcessParagraph::getFidFromHashKey($hash_key);
      if ($fid) {
        return $fid;
      }
    }
  }

  /**
   * Get file information from the file_managed schema.
   *
   * @param string $filename
   *   Name of the file.
   *
   * @return integer
   *   Returns file fid if present.
   */
  public static function get_file_fid($filename) {
    $filename = trim($filename);
    $query = \Drupal::database()->select('file_managed', 'p');
    $query->addField('p', 'fid');
    $query->condition('p.filename', $filename, 'like');
    $fid = $query->execute()->fetchField();
    return $fid;
  }