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diff --git a/web/core/modules/user/src/Plugin/Block/UserLoginBlock.php b/web/core/modules/user/src/Plugin/Block/UserLoginBlock.php
new file mode 100644
index 000000000..ed0e2eaf1
--- /dev/null
+++ b/web/core/modules/user/src/Plugin/Block/UserLoginBlock.php
@@ -0,0 +1,131 @@
+<?php
+
+namespace Drupal\user\Plugin\Block;
+
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Plugin\ContainerFactoryPluginInterface;
+use Drupal\Core\Routing\RedirectDestinationTrait;
+use Drupal\Core\Routing\RouteMatchInterface;
+use Drupal\Core\Routing\UrlGeneratorTrait;
+use Drupal\Core\Url;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\Block\BlockBase;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Provides a 'User login' block.
+ *
+ * @Block(
+ *   id = "user_login_block",
+ *   admin_label = @Translation("User login"),
+ *   category = @Translation("Forms")
+ * )
+ */
+class UserLoginBlock extends BlockBase implements ContainerFactoryPluginInterface {
+
+  use UrlGeneratorTrait;
+  use RedirectDestinationTrait;
+
+  /**
+   * The route match.
+   *
+   * @var \Drupal\Core\Routing\RouteMatchInterface
+   */
+  protected $routeMatch;
+
+  /**
+   * Constructs a new UserLoginBlock instance.
+   *
+   * @param array $configuration
+   *   The plugin configuration, i.e. an array with configuration values keyed
+   *   by configuration option name. The special key 'context' may be used to
+   *   initialize the defined contexts by setting it to an array of context
+   *   values keyed by context names.
+   * @param string $plugin_id
+   *   The plugin_id for the plugin instance.
+   * @param mixed $plugin_definition
+   *   The plugin implementation definition.
+   * @param \Drupal\Core\Routing\RouteMatchInterface $route_match
+   *   The route match.
+   */
+  public function __construct(array $configuration, $plugin_id, $plugin_definition, RouteMatchInterface $route_match) {
+    parent::__construct($configuration, $plugin_id, $plugin_definition);
+
+    $this->routeMatch = $route_match;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function create(ContainerInterface $container, array $configuration, $plugin_id, $plugin_definition) {
+    return new static(
+      $configuration,
+      $plugin_id,
+      $plugin_definition,
+      $container->get('current_route_match')
+    );
+  }
+
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function blockAccess(AccountInterface $account) {
+    $route_name = $this->routeMatch->getRouteName();
+    if ($account->isAnonymous() && !in_array($route_name, ['user.login', 'user.logout'])) {
+      return AccessResult::allowed()
+        ->addCacheContexts(['route.name', 'user.roles:anonymous']);
+    }
+    return AccessResult::forbidden();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function build() {
+    $form = \Drupal::formBuilder()->getForm('Drupal\user\Form\UserLoginForm');
+    unset($form['name']['#attributes']['autofocus']);
+    // When unsetting field descriptions, also unset aria-describedby attributes
+    // to avoid introducing an accessibility bug.
+    // @todo Do this automatically in https://www.drupal.org/node/2547063.
+    unset($form['name']['#description']);
+    unset($form['name']['#attributes']['aria-describedby']);
+    unset($form['pass']['#description']);
+    unset($form['pass']['#attributes']['aria-describedby']);
+    $form['name']['#size'] = 15;
+    $form['pass']['#size'] = 15;
+    $form['#action'] = $this->url('<current>', [], ['query' => $this->getDestinationArray(), 'external' => FALSE]);
+    // Build action links.
+    $items = [];
+    if (\Drupal::config('user.settings')->get('register') != USER_REGISTER_ADMINISTRATORS_ONLY) {
+      $items['create_account'] = [
+        '#type' => 'link',
+        '#title' => $this->t('Create new account'),
+        '#url' => Url::fromRoute('user.register', [], [
+          'attributes' => [
+            'title' => $this->t('Create a new user account.'),
+            'class' => ['create-account-link'],
+          ],
+        ]),
+      ];
+    }
+    $items['request_password'] = [
+      '#type' => 'link',
+      '#title' => $this->t('Reset your password'),
+      '#url' => Url::fromRoute('user.pass', [], [
+        'attributes' => [
+          'title' => $this->t('Send password reset instructions via email.'),
+          'class' => ['request-password-link'],
+        ],
+      ]),
+    ];
+    return [
+      'user_login_form' => $form,
+      'user_links' => [
+        '#theme' => 'item_list',
+        '#items' => $items,
+      ],
+    ];
+  }
+
+}