Route.php

<?php

namespace Drupal\migrate\Plugin\migrate\process;

use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Core\Path\PathValidatorInterface;
use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
use Drupal\migrate\MigrateExecutableInterface;
use Drupal\migrate\Plugin\MigrationInterface;
use Drupal\migrate\ProcessPluginBase;
use Drupal\migrate\Row;

/**
 * Sets the destination route information based on the source link_path.
 *
 * The source value is an array of two values:
 * - link_path: The path or URL of the route.
 * - options: An array of URL options, e.g. query string, attributes, etc.
 *
 * Example:
 *
 * @code
 * process:
 *   new_route_field:
 *     plugin: route
 *     source:
 *       - 'https://www.drupal.org'
 *       -
 *         attributes:
 *           title: Drupal
 * @endcode
 *
 * This will set new_route_field to be a route with the URL
 * "https://www.drupal.org" and title attribute "Drupal".
 *
 * Example:
 *
 * @code
 * process:
 *   another_route_field:
 *     plugin: route
 *     source:
 *       - 'user/login'
 *       -
 *         query:
 *           destination: 'node/1'
 * @endcode
 *
 * This will set another_route_field to be a route to the user login page
 * (user/login) with a query string of "destination=node/1".
 *
 * @see \Drupal\migrate\Plugin\MigrateProcessInterface
 *
 * @MigrateProcessPlugin(
 *   id = "route"
 * )
 */
class Route extends ProcessPluginBase implements ContainerFactoryPluginInterface {
    
    /**
     * The current migration.
     */
    protected $migration;
    
    /**
     * The path validator service.
     *
     * @var \Drupal\Core\Path\PathValidatorInterface
     */
    protected $pathValidator;
    
    /**
     * {@inheritdoc}
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration, PathValidatorInterface $path_validator) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->migration = $migration;
        $this->pathValidator = $path_validator;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition, MigrationInterface $migration = NULL) {
        return new static($configuration, $plugin_id, $plugin_definition, $migration, $container->get('path.validator'));
    }
    
    /**
     * {@inheritdoc}
     *
     * Set the destination route information based on the source link_path.
     */
    public function transform($value, MigrateExecutableInterface $migrate_executable, Row $row, $destination_property) {
        if (is_string($value)) {
            $link_path = $value;
            $options = [];
        }
        else {
            [
                $link_path,
                $options,
            ] = $value;
        }
        $extracted = $this->pathValidator
            ->getUrlIfValidWithoutAccessCheck($link_path);
        $route = [];
        if ($extracted) {
            if ($extracted->isExternal()) {
                $route['route_name'] = NULL;
                $route['route_parameters'] = [];
                $route['options'] = $options;
                $route['url'] = $extracted->getUri();
            }
            else {
                $route['route_name'] = $extracted->getRouteName();
                $route['route_parameters'] = $extracted->getRouteParameters();
                $route['options'] = $extracted->getOptions();
                if (isset($options['query'])) {
                    // If the querystring is stored as a string (as in D6), convert it
                    // into an array.
                    if (is_string($options['query'])) {
                        parse_str($options['query'], $old_query);
                    }
                    else {
                        $old_query = $options['query'];
                    }
                    $options['query'] = $route['options']['query'] + $old_query;
                    unset($route['options']['query']);
                }
                $route['options'] = $route['options'] + $options;
                $route['url'] = NULL;
            }
        }
        return $route;
    }

}