--- /dev/null
+<?php
+
+namespace Drupal\user\ContextProvider;
+
+use Drupal\Core\Cache\CacheableMetadata;
+use Drupal\Core\Entity\EntityManagerInterface;
+use Drupal\Core\Plugin\Context\Context;
+use Drupal\Core\Plugin\Context\ContextDefinition;
+use Drupal\Core\Plugin\Context\ContextProviderInterface;
+use Drupal\Core\Session\AccountInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+
+/**
+ * Sets the current user as a context.
+ */
+class CurrentUserContext implements ContextProviderInterface {
+
+ use StringTranslationTrait;
+
+ /**
+ * The current user.
+ *
+ * @var \Drupal\Core\Session\AccountInterface
+ */
+ protected $account;
+
+ /**
+ * The user storage.
+ *
+ * @var \Drupal\user\UserStorageInterface
+ */
+ protected $userStorage;
+
+ /**
+ * Constructs a new CurrentUserContext.
+ *
+ * @param \Drupal\Core\Session\AccountInterface $account
+ * The current user.
+ * @param \Drupal\Core\Entity\EntityManagerInterface $entity_manager
+ * The entity manager.
+ */
+ public function __construct(AccountInterface $account, EntityManagerInterface $entity_manager) {
+ $this->account = $account;
+ $this->userStorage = $entity_manager->getStorage('user');
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getRuntimeContexts(array $unqualified_context_ids) {
+ $current_user = $this->userStorage->load($this->account->id());
+
+ $context = new Context(new ContextDefinition('entity:user', $this->t('Current user')), $current_user);
+ $cacheability = new CacheableMetadata();
+ $cacheability->setCacheContexts(['user']);
+ $context->addCacheableDependency($cacheability);
+
+ $result = [
+ 'current_user' => $context,
+ ];
+
+ return $result;
+ }
+
+ /**
+ * {@inheritdoc}
+ */
+ public function getAvailableContexts() {
+ return $this->getRuntimeContexts([]);
+ }
+
+}