class WorkspaceSwitcherBlock

class WorkspaceSwitcherBlock extends BlockBase implements ContainerFactoryPluginInterface {
    
    /**
     * The form builder.
     *
     * @var \Drupal\Core\Form\FormBuilderInterface
     */
    protected $formBuilder;
    
    /**
     * The entity type manager.
     *
     * @var \Drupal\Core\Entity\EntityTypeManagerInterface
     */
    protected $entityTypeManager;
    
    /**
     * Constructs a new WorkspaceSwitcherBlock instance.
     *
     * @param array $configuration
     *   The plugin configuration.
     * @param string $plugin_id
     *   The plugin ID.
     * @param mixed $plugin_definition
     *   The plugin definition.
     * @param \Drupal\Core\Form\FormBuilderInterface $form_builder
     *   The form builder.
     * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
     *   The entity type manager.
     */
    public function __construct(array $configuration, $plugin_id, $plugin_definition, FormBuilderInterface $form_builder, EntityTypeManagerInterface $entity_type_manager) {
        parent::__construct($configuration, $plugin_id, $plugin_definition);
        $this->formBuilder = $form_builder;
        $this->entityTypeManager = $entity_type_manager;
    }
    
    /**
     * {@inheritdoc}
     */
    public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
        return new static($configuration, $plugin_id, $plugin_definition, $container->get('form_builder'), $container->get('entity_type.manager'));
    }
    
    /**
     * {@inheritdoc}
     */
    public function build() {
        $build = [
            'form' => $this->formBuilder
                ->getForm(WorkspaceSwitcherForm::class),
            '#cache' => [
                'contexts' => $this->entityTypeManager
                    ->getDefinition('workspace')
                    ->getListCacheContexts(),
                'tags' => $this->entityTypeManager
                    ->getDefinition('workspace')
                    ->getListCacheTags(),
            ],
        ];
        return $build;
    }
    
    /**
     * {@inheritdoc}
     */
    protected function blockAccess(AccountInterface $account) : AccessResultInterface {
        return AccessResult::allowedIfHasPermissions($account, [
            'view own workspace',
            'view any workspace',
            'administer workspaces',
        ], 'OR');
    }

}