Move into nested docroot

web/core/modules/user/src/Theme/AdminNegotiator.php

@@ -0,0 +1,78 @@
+<?php
+
+namespace Drupal\user\Theme;
+
+use Drupal\Core\Config\ConfigFactoryInterface;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Routing\AdminContext;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Theme\ThemeNegotiatorInterface;
+
+/**
+ * Sets the active theme on admin pages.
+ */
+class AdminNegotiator implements ThemeNegotiatorInterface {
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountInterface
+   */
+  protected $user;
+
+  /**
+   * The config factory.
+   *
+   * @var \Drupal\Core\Config\ConfigFactoryInterface
+   */
+  protected $configFactory;
+
+  /**
+   * The entity manager.
+   *
+   * @var \Drupal\Core\Entity\EntityManagerInterface
+   */
+  protected $entityManager;
+
+  /**
+   * The route admin context to determine whether a route is an admin one.
+   *
+   * @var \Drupal\Core\Routing\AdminContext
+   */
+  protected $adminContext;
+
+  /**
+   * Creates a new AdminNegotiator instance.
+   *
+   * @param \Drupal\Core\Session\AccountInterface $user
+   *   The current user.
+   * @param \Drupal\Core\Config\ConfigFactoryInterface $config_factory
+   *   The config factory.
+   * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+   *   The entity manager.
+   * @param \Drupal\Core\Routing\AdminContext $admin_context
+   *   The route admin context to determine whether the route is an admin one.
+   */
+  public function __construct(AccountInterface $user, ConfigFactoryInterface $config_factory, EntityManagerInterface $entity_manager, AdminContext $admin_context) {
+    $this->user = $user;
+    $this->configFactory = $config_factory;
+    $this->entityManager = $entity_manager;
+    $this->adminContext = $admin_context;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function applies(RouteMatchInterface $route_match) {
+    return ($this->entityManager->hasHandler('user_role', 'storage') && $this->user->hasPermission('view the administration theme') && $this->adminContext->isAdminRoute($route_match->getRouteObject()));
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function determineActiveTheme(RouteMatchInterface $route_match) {
+    return $this->configFactory->get('system.theme')->get('admin');
+  }
+
+}