Extension.php

<?php

namespace Drupal\system\Plugin\migrate\source;

use Drupal\migrate\Row;
use Drupal\migrate_drupal\Plugin\migrate\source\DrupalSqlBase;

/**
 * Drupal 6/7 system data for a legacy extension source from database.
 *
 * Available configuration keys:
 * - name: (optional) The extension name to filter items retrieved from the
 *   source - can be a string or an array. If omitted, all extensions are
 *   retrieved.
 *
 * Examples:
 *
 * @code
 * source:
 *   plugin: extension
 *   name: node
 * @endcode
 *
 * In this example the system data for node module is retrieved from the source
 * database.
 *
 * For additional configuration keys, refer to the parent classes.
 *
 * @see \Drupal\migrate\Plugin\migrate\source\SqlBase
 * @see \Drupal\migrate\Plugin\migrate\source\SourcePluginBase
 *
 * @MigrateSource(
 *   id = "extension",
 *   source_module = "system"
 * )
 */
class Extension extends DrupalSqlBase {
    
    /**
     * {@inheritdoc}
     */
    public function query() {
        $query = $this->select('system', 's')
            ->fields('s');
        if (isset($this->configuration['name'])) {
            $query->condition('name', (array) $this->configuration['name'], 'IN');
        }
        return $query;
    }
    
    /**
     * {@inheritdoc}
     */
    public function fields() {
        $fields = [
            'filename' => $this->t('Filename'),
            'name' => $this->t('Name'),
            'type' => $this->t('Type'),
            'owner' => $this->t('Owner'),
            'status' => $this->t('Status'),
            'throttle' => $this->t('Throttle'),
            'bootstrap' => $this->t('Bootstrap'),
            'schema_version' => $this->t('Schema version'),
            'weight' => $this->t('Weight'),
            'info' => $this->t('Information array'),
        ];
        return $fields;
    }
    
    /**
     * {@inheritdoc}
     */
    public function prepareRow(Row $row) {
        $row->setSourceProperty('info', unserialize($row->getSourceProperty('info')));
        return parent::prepareRow($row);
    }
    
    /**
     * {@inheritdoc}
     */
    public function getIds() {
        $ids['name']['type'] = 'string';
        return $ids;
    }

}