class ShortcutSetController

class ShortcutSetController extends ControllerBase {
    
    /**
     * The path validator.
     *
     * @var \Drupal\Core\Path\PathValidatorInterface
     */
    protected $pathValidator;
    
    /**
     * Creates a new ShortcutSetController instance.
     *
     * @param \Drupal\Core\Path\PathValidatorInterface $path_validator
     *   The path validator.
     */
    public function __construct(PathValidatorInterface $path_validator) {
        $this->pathValidator = $path_validator;
    }
    
    /**
     * Creates a new link in the provided shortcut set.
     *
     * @param \Drupal\shortcut\ShortcutSetInterface $shortcut_set
     *   The shortcut set to add a link to.
     * @param \Symfony\Component\HttpFoundation\Request $request
     *   The request object.
     *
     * @return \Symfony\Component\HttpFoundation\RedirectResponse
     *   A redirect response to the front page, or the previous location.
     *
     * @throws \Symfony\Component\HttpKernel\Exception\AccessDeniedHttpException
     */
    public function addShortcutLinkInline(ShortcutSetInterface $shortcut_set, Request $request) {
        $link = $request->query
            ->get('link');
        $name = $request->query
            ->get('name');
        if (parse_url($link, PHP_URL_SCHEME) === NULL && $this->pathValidator
            ->isValid($link)) {
            $shortcut = $this->entityTypeManager()
                ->getStorage('shortcut')
                ->create([
                'title' => $name,
                'shortcut_set' => $shortcut_set->id(),
                'link' => [
                    'uri' => 'internal:/' . $link,
                ],
            ]);
            try {
                $shortcut->save();
                $this->messenger()
                    ->addStatus($this->t('Added a shortcut for %title.', [
                    '%title' => $shortcut->label(),
                ]));
            } catch (\Exception $e) {
                $this->messenger()
                    ->addError($this->t('Unable to add a shortcut for %title.', [
                    '%title' => $shortcut->label(),
                ]));
            }
            return $this->redirect('<front>');
        }
        throw new AccessDeniedHttpException();
    }

}