islandora/islandora_fits.module

<?php

/**
 * @file
 * Contains islandora_fits.module.
 */

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\media\MediaInterface;
use Drupal\file\Entity\File;
use Drupal\media\Entity\Media;

/**
 * Implements hook_help().
 */
function islandora_fits_help($route_name, RouteMatchInterface $route_match) {
  switch ($route_name) {
    // Main module help for the islandora_fits module.
    case 'help.page.islandora_fits':
      $output = '';
      $output .= '<h3>' . t('About') . '</h3>';
      $output .= '<p>' . t('Enables Technical Metadata derivative generation') . '</p>';
      return $output;

    default:
  }
}

/**
 * Implements hook_theme().
 */
function islandora_fits_theme($existing, $type, $theme, $path) {
  return [
    'fits' => [
      'variables' => [
        'title' => 'FITS data',
        'link' => NULL,
        'output' => [],
      ],
    ],
  ];
}

/**
 * Implements hook_ENTITY_TYPE_presave().
 */
function islandora_fits_media_presave(MediaInterface $media) {
  if ($media->bundle() != 'fits_technical_metadata') {
    return;
  }
  $transformer = \Drupal::getContainer()->get('islandora_fits.transformxml');
  $media->set('field_complete', TRUE);
  $file_id = $media->get('field_media_file')->getValue()[0]['target_id'];
  $file = File::load($file_id);
  $data = file_get_contents($file->getFileUri());
  // Adds any new fields to FITS media type.
  $has_new = $transformer->checkNew($data);
  if ($has_new) {
    $media->set('field_complete', FALSE);
  }
  else {
    $transformer->populateMedia($data, $media);
  }
}

/**
 * Implements hook_media_update().
 */
function islandora_fits_media_update(MediaInterface $media) {
  if ($media->bundle() != 'fits_technical_metadata') {
    return;
  }
  if ($media->get('field_complete')->value == FALSE) {
    $transformer = \Drupal::getContainer()->get('islandora_fits.transformxml');
    $file_id = $media->get('field_media_file')->getValue()[0]['target_id'];
    $file = File::load($file_id);
    $data = file_get_contents($file->getFileUri());
    $transformer->addMediaFields($data);
    $new_media = Media::load($media->id());
    $new_media->set('field_complete', TRUE);
    $new_media->save();
  }
}

/**
 * Implements hook_media_insert().
 */
function islandora_fits_media_insert(MediaInterface $media) {
  if ($media->bundle() != 'fits_technical_metadata') {
    return;
  }
  islandora_fits_media_update($media);
}

/**
 * Implements hook_entity_extra_field_info().
 */
function islandora_fits_entity_extra_field_info() {
  $extra = [];
  $extra['node']['islandora_object']['display']['islandora_fits_checksum'] = [
    'label' => t('File Checksum'),
    'description' => t('Checksum as discovered by FITs webservice'),
    'weight' => 100,
    'visible' => TRUE,
  ];
  return $extra;
}

/**
 * Implements hook_entity_view().
 */
function islandora_fits_entity_view(array &$build, $entity, $display, $view_mode) {
  $route_match_item = \Drupal::routeMatch()->getParameters()->all();
  $current_entity = reset($route_match_item);

  if ($entity === $current_entity) {
    $medias = \Drupal::entityQuery(
      'media')
      ->condition('field_media_of', $entity->id())
      ->condition('bundle', 'fits_technical_metadata')
      ->execute();
    $mid = \reset($medias);
    if ($mid) {
      $fits = Media::load($mid);
      $checksum = $fits->get('fits_ois_file_information_md5che')->value;
      if ($checksum) {
        $build['islandora_fits_checksum'] = [
          '#type' => 'container',
          '#attributes' => [
            'id' => 'field-islandora-checksum',
          ],
          'checksum' => [
            '#type' => 'item',
            '#title' => t('MD5 Checksum'),
            'internal_uri' => [
              '#type' => 'markup',
              '#markup' => $checksum,
            ],
          ],
        ];
      }

    }
  }
}