Drupal 8.0.0 beta 12. More info: https://www.drupal.org/node/2514176

core/modules/block/src/BlockAccessControlHandler.php

@@ -0,0 +1,118 @@
+<?php
+
+/**
+ * @file
+ * Contains \Drupal\block\BlockAccessControlHandler.
+ */
+
+namespace Drupal\block;
+
+use Drupal\Component\Plugin\Exception\ContextException;
+use Drupal\Core\Access\AccessResult;
+use Drupal\Core\Condition\ConditionAccessResolverTrait;
+use Drupal\Core\Entity\EntityAccessControlHandler;
+use Drupal\Core\Entity\EntityHandlerInterface;
+use Drupal\Core\Entity\EntityInterface;
+use Drupal\Core\Entity\EntityTypeInterface;
+use Drupal\Core\Executable\ExecutableManagerInterface;
+use Drupal\Core\Plugin\Context\ContextHandlerInterface;
+use Drupal\Core\Plugin\ContextAwarePluginInterface;
+use Drupal\Core\Session\AccountInterface;
+use Symfony\Component\DependencyInjection\ContainerInterface;
+
+/**
+ * Defines the access control handler for the block entity type.
+ *
+ * @see \Drupal\block\Entity\Block
+ */
+class BlockAccessControlHandler extends EntityAccessControlHandler implements EntityHandlerInterface {
+
+  use ConditionAccessResolverTrait;
+
+  /**
+   * The condition plugin manager.
+   *
+   * @var \Drupal\Core\Executable\ExecutableManagerInterface
+   */
+  protected $manager;
+
+  /**
+   * The plugin context handler.
+   *
+   * @var \Drupal\Core\Plugin\Context\ContextHandlerInterface
+   */
+  protected $contextHandler;
+
+  /**
+   * {@inheritdoc}
+   */
+  public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
+    return new static(
+      $entity_type,
+      $container->get('plugin.manager.condition'),
+      $container->get('context.handler')
+    );
+  }
+
+  /**
+   * Constructs the block access control handler instance
+   *
+   * @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
+   *   The entity type definition.
+   * @param \Drupal\Core\Executable\ExecutableManagerInterface $manager
+   *   The ConditionManager for checking visibility of blocks.
+   * @param \Drupal\Core\Plugin\Context\ContextHandlerInterface $context_handler
+   *   The ContextHandler for applying contexts to conditions properly.
+   */
+  public function __construct(EntityTypeInterface $entity_type, ExecutableManagerInterface $manager, ContextHandlerInterface $context_handler) {
+    parent::__construct($entity_type);
+    $this->manager = $manager;
+    $this->contextHandler = $context_handler;
+  }
+
+
+  /**
+   * {@inheritdoc}
+   */
+  protected function checkAccess(EntityInterface $entity, $operation, $langcode, AccountInterface $account) {
+    /** @var \Drupal\block\BlockInterface $entity */
+    if ($operation != 'view') {
+      return parent::checkAccess($entity, $operation, $langcode, $account);
+    }
+
+    // Don't grant access to disabled blocks.
+    if (!$entity->status()) {
+      return AccessResult::forbidden()->cacheUntilEntityChanges($entity);
+    }
+    else {
+      $contexts = $entity->getContexts();
+      $conditions = [];
+      foreach ($entity->getVisibilityConditions() as $condition_id => $condition) {
+        if ($condition instanceof ContextAwarePluginInterface) {
+          try {
+            $this->contextHandler->applyContextMapping($condition, $contexts);
+          }
+          catch (ContextException $e) {
+            return AccessResult::forbidden()->setCacheMaxAge(0);
+          }
+        }
+        $conditions[$condition_id] = $condition;
+      }
+      if ($this->resolveConditions($conditions, 'and') !== FALSE) {
+        // Delegate to the plugin.
+        $access = $entity->getPlugin()->access($account, TRUE);
+      }
+      else {
+        $access = AccessResult::forbidden();
+      }
+      // This should not be hardcoded to an uncacheable access check result, but
+      // in order to fix that, we need condition plugins to return cache contexts,
+      // otherwise it will be impossible to determine by which cache contexts the
+      // result should be varied.
+      // @todo Change this to use $access->cacheUntilEntityChanges($entity) once
+      //   https://www.drupal.org/node/2375695 is resolved.
+      return $access->setCacheMaxAge(0);
+    }
+  }
+
+}