Merge Fotoweb metadata into File Entity fields

merge-fotoweb-metadata-into-file-entity-fields.php

<?php

function mymodule_file_presave($file) {
  if ($file->type === 'image' && file_uri_scheme($file->uri) === 'fotoweb') {
    $wrapper = entity_metadata_wrapper('file', $file);
    $field_map = array(
      'field_file_image_alt_text' => 120,
      'field_file_image_title_text' => 5,
      'field_image_caption' => 121,
      'field_image_byline' => 80,
    );
    $metadata = $file->metadata['asset_metadata'];
    try {
      foreach ($field_map as $field_name => $metadata_key) {
        // Update field only, when existing and metadata is not empty.
        if ($wrapper->__isset($field_name) && !empty($metadata[$metadata_key]['value'])) {
          $value = $metadata[$metadata_key]['value'];

          // Some attributes are nested, concatenate them comma-separated.
          if (is_array($value)) {
            $value = implode(', ', $value);
          }

          // We need to divide between textfields and text_formatted fields.
          if ($wrapper->{$field_name}->type() === 'text_formatted') {
            $wrapper->{$field_name}->value = $value;
            $wrapper->{$field_name}->format = 'caption';
          }
          else {
            $wrapper->{$field_name} = $value;
          }
        }
      }
    } catch (EntityMetadataWrapperException $exception) {
      watchdog('mymodule', $exception->getMessage(), array(), WATCHDOG_ERROR);
    }
  }
}