--- /dev/null
+<?php
+
+namespace Drupal\user;
+
+use Drupal\Core\Session\AccountProxyInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Drupal\Core\Url;
+
+/**
+ * ToolbarLinkBuilder fills out the placeholders generated in user_toolbar().
+ */
+class ToolbarLinkBuilder {
+
+ use StringTranslationTrait;
+
+ /**
+ * The current user.
+ *
+ * @var \Drupal\Core\Session\AccountProxyInterface
+ */
+ protected $account;
+
+ /**
+ * ToolbarHandler constructor.
+ *
+ * @param \Drupal\Core\Session\AccountProxyInterface $account
+ * The current user.
+ */
+ public function __construct(AccountProxyInterface $account) {
+ $this->account = $account;
+ }
+
+ /**
+ * Lazy builder callback for rendering toolbar links.
+ *
+ * @return array
+ * A renderable array as expected by the renderer service.
+ */
+ public function renderToolbarLinks() {
+ $links = [
+ 'account' => [
+ 'title' => $this->t('View profile'),
+ 'url' => Url::fromRoute('user.page'),
+ 'attributes' => [
+ 'title' => $this->t('User account'),
+ ],
+ ],
+ 'account_edit' => [
+ 'title' => $this->t('Edit profile'),
+ 'url' => Url::fromRoute('entity.user.edit_form', ['user' => $this->account->id()]),
+ 'attributes' => [
+ 'title' => $this->t('Edit user account'),
+ ],
+ ],
+ 'logout' => [
+ 'title' => $this->t('Log out'),
+ 'url' => Url::fromRoute('user.logout'),
+ ],
+ ];
+ $build = [
+ '#theme' => 'links__toolbar_user',
+ '#links' => $links,
+ '#attributes' => [
+ 'class' => ['toolbar-menu'],
+ ],
+ '#cache' => [
+ 'contexts' => ['user'],
+ ],
+ ];
+
+ return $build;
+ }
+
+ /**
+ * Lazy builder callback for rendering the username.
+ *
+ * @return array
+ * A renderable array as expected by the renderer service.
+ */
+ public function renderDisplayName() {
+ return [
+ '#markup' => $this->account->getDisplayName(),
+ ];
+ }
+
+}