islandora/islandora_fits.module

<?php

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

use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\media\MediaInterface;
use Drupal\taxonomy\Entity\Term;
use Drupal\node\Entity\Node;
use Drupal\file\Entity\File;


/**
 * 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_install().
 */
function islandora_fits_install() {
    $term_name = 'FITS File';
    $test_terms = taxonomy_term_load_multiple_by_name($term_name);
    if (!$test_terms) {
        $term = Term::create(array(
            'parent' => [],
            'name' => $term_name,
            'vid' => 'islandora_media_use',
            'description' => 'Technical Metadata associated with an original media file',
            'field_external_uri' => ['uri' => 'https://projects.iq.harvard.edu/fits'],
        ))->save();
    }
}

/**
 * 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) {
    $transformer = \Drupal::getContainer()->get('islandora_fits.transformxml');
    if ($media->bundle() != 'fits_technical_metadata') {
        return;
    }
    $attached = $media->get('field_attached_fits_node')->referencedEntities()[0];
    $data_of = $media->get('field_media_of')->referencedEntities()[0];
    $title = $data_of->getTitle();
    if (!$attached) {
        $node = Node::create(['type' => 'fits_technical_metadata']);
        $node->setTitle("Fits Metadata of $title");
        $node->save();
        $media->field_attached_fits_node->target_id = $node->id();
        $attached = $node;
    }
    $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 content type.
    $transformer->add_node_fields($data);
    $transformer->populate_node($data, $attached);
    $attached->save();
}