islandora/islandora_fits.module

<?php

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

use Drupal\field\Entity\FieldConfig;
use Drupal\Core\Routing\RouteMatchInterface;
use Drupal\media\MediaInterface;
use Drupal\taxonomy\Entity\Term;
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_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();
    }
// Add xml extension if it doesn't already exist;
    $field = FieldConfig::load("media.file.field_media_file");
    $fieldSettings = $field->getSettings();
    $extensions = $fieldSettings['file_extensions'];
    if (!strpos($extensions, 'xml')) {
        $fieldSettings['file_extensions'] .= ' xml';
        $field->set('settings', $fieldSettings);
    }
}

/**
 * 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;
    }
    $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 = $transformer->check_new($data);
    if ($has_new) {
        $media->set('field_complete', FALSE);
    } else {
        $transformer->populate_media($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());
        $transformer->add_media_fields($data);
        $new_media = Media::load($media->id());
        $new_media->set('field_complete', TRUE);
        $new_media->save();
    }
}