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;
use Drupal\node\Entity\NodeType;

/**
 * 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_extra_field_info().
 */
function islandora_fits_entity_extra_field_info() {
  $entityFieldManager = \Drupal::service('entity_field.manager');
  $node_types = NodeType::loadMultiple();
  $extra = [];
  $types = [];
  foreach ($node_types as $node_type) {
    $types[] = $node_type->get('type');
  }

  foreach ($types as $bundle) {
    $fields = $entityFieldManager->getFieldDefinitions('node', $bundle);
    if (array_key_exists('field_model', $fields) && array_key_exists('field_member_of', $fields)) {
      $extra['node'][$bundle]['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')
      ->accessCheck(TRUE)
      ->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,
            ],
          ],
        ];
      }

    }
  }
}