TitleResolver.php

<?php

namespace Drupal\easy_breadcrumb;

use Drupal\Core\Controller\TitleResolver as ControllerTitleResolver;
use Drupal\Core\Url;
use Symfony\Component\HttpFoundation\Request;
use Symfony\Component\Routing\Route;
use Drupal\Core\Entity\EntityTypeManagerInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;
use Drupal\Core\Config\ConfigFactoryInterface;
use Drupal\Component\Utility\Xss;

/**
 * Class TitleResolver.
 */
class TitleResolver extends ControllerTitleResolver {
    
    /**
     * The field storage config storage.
     *
     * @var \Drupal\Core\Entity\EntityTypeManager
     */
    protected $entityTypeManager;
    
    /**
     * Breadcrumb config object.
     *
     * @var \Drupal\Core\Config\Config
     */
    protected $config;
    
    /**
     * Constructs a new EntityDisplayRebuilder.
     *
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity manager.
     * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
     *   The config factory service.
     */
    public function __construct(EntityTypeManagerInterface $entity_type_manager, ConfigFactoryInterface $config_factory) {
        $this->entityTypeManager = $entity_type_manager;
        $this->config = $config_factory->get(EasyBreadcrumbConstants::MODULE_SETTINGS);
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container) {
        return new static($container->get('entity_type.manager'), $container->get('config.factory'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function getTitle(Request $request, Route $route) {
        $url = Url::fromUri("internal:" . $request->getRequestUri());
        $route_parts = explode(".", $url->getRouteName());
        $entity = NULL;
        $params = $url->getRouteParameters();
        if ($route_parts[0] === 'entity' && $route_parts[2] === 'canonical') {
            $entity_type = $route_parts[1];
            $entity = $this->entityTypeManager
                ->getStorage($entity_type)
                ->load($params[$entity_type]);
        }
        if ($entity !== NULL) {
            $alternative_title_field = $this->config
                ->get(EasyBreadcrumbConstants::ALTERNATIVE_TITLE_FIELD);
            if ($entity->hasField($alternative_title_field) && !$entity->get($alternative_title_field)
                ->isEmpty()) {
                return Xss::filter($entity->get($alternative_title_field)->value);
            }
        }
        return parent::getTitle($request, $route);
    }

}