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diff --git a/web/core/modules/workspaces/src/WorkspaceManager.php b/web/core/modules/workspaces/src/WorkspaceManager.php
new file mode 100644
index 000000000..faa5f8ffa
--- /dev/null
+++ b/web/core/modules/workspaces/src/WorkspaceManager.php
@@ -0,0 +1,283 @@
+<?php
+
+namespace Drupal\workspaces;
+
+use Drupal\Core\DependencyInjection\ClassResolverInterface;
+use Drupal\Core\Entity\EntityPublishedInterface;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Entity\EntityTypeManagerInterface;
+use Drupal\Core\Session\AccountProxyInterface;
+use Drupal\Core\Site\Settings;
+use Drupal\Core\State\StateInterface;
+use Drupal\Core\StringTranslation\StringTranslationTrait;
+use Psr\Log\LoggerInterface;
+use Symfony\Component\HttpFoundation\RequestStack;
+
+/**
+ * Provides the workspace manager.
+ */
+class WorkspaceManager implements WorkspaceManagerInterface {
+
+  use StringTranslationTrait;
+
+  /**
+   * An array of entity type IDs that can not belong to a workspace.
+   *
+   * By default, only entity types which are revisionable and publishable can
+   * belong to a workspace.
+   *
+   * @var string[]
+   */
+  protected $blacklist = [
+    'workspace_association',
+    'workspace',
+  ];
+
+  /**
+   * The request stack.
+   *
+   * @var \Symfony\Component\HttpFoundation\RequestStack
+   */
+  protected $requestStack;
+
+  /**
+   * The entity type manager.
+   *
+   * @var \Drupal\Core\Entity\EntityTypeManagerInterface
+   */
+  protected $entityTypeManager;
+
+  /**
+   * The current user.
+   *
+   * @var \Drupal\Core\Session\AccountProxyInterface
+   */
+  protected $currentUser;
+
+  /**
+   * The state service.
+   *
+   * @var \Drupal\Core\State\StateInterface
+   */
+  protected $state;
+
+  /**
+   * A logger instance.
+   *
+   * @var \Psr\Log\LoggerInterface
+   */
+  protected $logger;
+
+  /**
+   * The class resolver.
+   *
+   * @var \Drupal\Core\DependencyInjection\ClassResolverInterface
+   */
+  protected $classResolver;
+
+  /**
+   * The workspace negotiator service IDs.
+   *
+   * @var array
+   */
+  protected $negotiatorIds;
+
+  /**
+   * The current active workspace.
+   *
+   * @var \Drupal\workspaces\WorkspaceInterface
+   */
+  protected $activeWorkspace;
+
+  /**
+   * Constructs a new WorkspaceManager.
+   *
+   * @param \Symfony\Component\HttpFoundation\RequestStack $request_stack
+   *   The request stack.
+   * @param \Drupal\Core\Entity\EntityTypeManagerInterface $entity_type_manager
+   *   The entity type manager.
+   * @param \Drupal\Core\Session\AccountProxyInterface $current_user
+   *   The current user.
+   * @param \Drupal\Core\State\StateInterface $state
+   *   The state service.
+   * @param \Psr\Log\LoggerInterface $logger
+   *   A logger instance.
+   * @param \Drupal\Core\DependencyInjection\ClassResolverInterface $class_resolver
+   *   The class resolver.
+   * @param array $negotiator_ids
+   *   The workspace negotiator service IDs.
+   */
+  public function __construct(RequestStack $request_stack, EntityTypeManagerInterface $entity_type_manager, AccountProxyInterface $current_user, StateInterface $state, LoggerInterface $logger, ClassResolverInterface $class_resolver, array $negotiator_ids) {
+    $this->requestStack = $request_stack;
+    $this->entityTypeManager = $entity_type_manager;
+    $this->currentUser = $current_user;
+    $this->state = $state;
+    $this->logger = $logger;
+    $this->classResolver = $class_resolver;
+    $this->negotiatorIds = $negotiator_ids;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function isEntityTypeSupported(EntityTypeInterface $entity_type) {
+    if (!isset($this->blacklist[$entity_type->id()])
+      && $entity_type->entityClassImplements(EntityPublishedInterface::class)
+      && $entity_type->isRevisionable()) {
+      return TRUE;
+    }
+    $this->blacklist[$entity_type->id()] = $entity_type->id();
+    return FALSE;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getSupportedEntityTypes() {
+    $entity_types = [];
+    foreach ($this->entityTypeManager->getDefinitions() as $entity_type_id => $entity_type) {
+      if ($this->isEntityTypeSupported($entity_type)) {
+        $entity_types[$entity_type_id] = $entity_type;
+      }
+    }
+    return $entity_types;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function getActiveWorkspace() {
+    if (!isset($this->activeWorkspace)) {
+      $request = $this->requestStack->getCurrentRequest();
+      foreach ($this->negotiatorIds as $negotiator_id) {
+        $negotiator = $this->classResolver->getInstanceFromDefinition($negotiator_id);
+        if ($negotiator->applies($request)) {
+          if ($this->activeWorkspace = $negotiator->getActiveWorkspace($request)) {
+            break;
+          }
+        }
+      }
+    }
+
+    // The default workspace negotiator always returns a valid workspace.
+    return $this->activeWorkspace;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function setActiveWorkspace(WorkspaceInterface $workspace) {
+    // If the current user doesn't have access to view the workspace, they
+    // shouldn't be allowed to switch to it.
+    if (!$workspace->access('view') && !$workspace->isDefaultWorkspace()) {
+      $this->logger->error('Denied access to view workspace %workspace_label for user %uid', [
+        '%workspace_label' => $workspace->label(),
+        '%uid' => $this->currentUser->id(),
+      ]);
+      throw new WorkspaceAccessException('The user does not have permission to view that workspace.');
+    }
+
+    $this->activeWorkspace = $workspace;
+
+    // Set the workspace on the proper negotiator.
+    $request = $this->requestStack->getCurrentRequest();
+    foreach ($this->negotiatorIds as $negotiator_id) {
+      $negotiator = $this->classResolver->getInstanceFromDefinition($negotiator_id);
+      if ($negotiator->applies($request)) {
+        $negotiator->setActiveWorkspace($workspace);
+        break;
+      }
+    }
+
+    $supported_entity_types = $this->getSupportedEntityTypes();
+    foreach ($supported_entity_types as $supported_entity_type) {
+      $this->entityTypeManager->getStorage($supported_entity_type->id())->resetCache();
+    }
+
+    return $this;
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function shouldAlterOperations(EntityTypeInterface $entity_type) {
+    return $this->isEntityTypeSupported($entity_type) && !$this->getActiveWorkspace()->isDefaultWorkspace();
+  }
+
+  /**
+   * {@inheritdoc}
+   */
+  public function purgeDeletedWorkspacesBatch() {
+    $deleted_workspace_ids = $this->state->get('workspace.deleted', []);
+
+    // Bail out early if there are no workspaces to purge.
+    if (empty($deleted_workspace_ids)) {
+      return;
+    }
+
+    $batch_size = Settings::get('entity_update_batch_size', 50);
+
+    /** @var \Drupal\workspaces\WorkspaceAssociationStorageInterface $workspace_association_storage */
+    $workspace_association_storage = $this->entityTypeManager->getStorage('workspace_association');
+
+    // Get the first deleted workspace from the list and delete the revisions
+    // associated with it, along with the workspace_association entries.
+    $workspace_id = reset($deleted_workspace_ids);
+    $workspace_association_ids = $this->getWorkspaceAssociationRevisionsToPurge($workspace_id, $batch_size);
+
+    if ($workspace_association_ids) {
+      $workspace_associations = $workspace_association_storage->loadMultipleRevisions(array_keys($workspace_association_ids));
+      foreach ($workspace_associations as $workspace_association) {
+        $associated_entity_storage = $this->entityTypeManager->getStorage($workspace_association->target_entity_type_id->value);
+        // Delete the associated entity revision.
+        if ($entity = $associated_entity_storage->loadRevision($workspace_association->target_entity_revision_id->value)) {
+          if ($entity->isDefaultRevision()) {
+            $entity->delete();
+          }
+          else {
+            $associated_entity_storage->deleteRevision($workspace_association->target_entity_revision_id->value);
+          }
+        }
+
+        // Delete the workspace_association revision.
+        if ($workspace_association->isDefaultRevision()) {
+          $workspace_association->delete();
+        }
+        else {
+          $workspace_association_storage->deleteRevision($workspace_association->getRevisionId());
+        }
+      }
+    }
+
+    // The purging operation above might have taken a long time, so we need to
+    // request a fresh list of workspace association IDs. If it is empty, we can
+    // go ahead and remove the deleted workspace ID entry from state.
+    if (!$this->getWorkspaceAssociationRevisionsToPurge($workspace_id, $batch_size)) {
+      unset($deleted_workspace_ids[$workspace_id]);
+      $this->state->set('workspace.deleted', $deleted_workspace_ids);
+    }
+  }
+
+  /**
+   * Gets a list of workspace association IDs to purge.
+   *
+   * @param string $workspace_id
+   *   The ID of the workspace.
+   * @param int $batch_size
+   *   The maximum number of records that will be purged.
+   *
+   * @return array
+   *   An array of workspace association IDs, keyed by their revision IDs.
+   */
+  protected function getWorkspaceAssociationRevisionsToPurge($workspace_id, $batch_size) {
+    return $this->entityTypeManager->getStorage('workspace_association')
+      ->getQuery()
+      ->allRevisions()
+      ->accessCheck(FALSE)
+      ->condition('workspace', $workspace_id)
+      ->sort('revision_id', 'ASC')
+      ->range(0, $batch_size)
+      ->execute();
+  }
+
+}