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<?php
namespace Drupal\block;
use Drupal\Component\Plugin\Exception\ContextException;
use Drupal\Core\Access\AccessResult;
use Drupal\Core\Cache\Cache;
use Drupal\Core\Cache\CacheableDependencyInterface;
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\Plugin\Context\ContextHandlerInterface;
use Drupal\Core\Plugin\Context\ContextRepositoryInterface;
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 plugin context handler.
*
* @var \Drupal\Core\Plugin\Context\ContextHandlerInterface
*/
protected $contextHandler;
/**
* The context manager service.
*
* @var \Drupal\Core\Plugin\Context\ContextRepositoryInterface
*/
protected $contextRepository;
/**
* {@inheritdoc}
*/
public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
return new static(
$entity_type,
$container->get('context.handler'),
$container->get('context.repository')
);
}
/**
* Constructs the block access control handler instance
*
* @param \Drupal\Core\Entity\EntityTypeInterface $entity_type
* The entity type definition.
* @param \Drupal\Core\Plugin\Context\ContextHandlerInterface $context_handler
* The ContextHandler for applying contexts to conditions properly.
* @param \Drupal\Core\Plugin\Context\ContextRepositoryInterface $context_repository
* The lazy context repository service.
*/
public function __construct(EntityTypeInterface $entity_type, ContextHandlerInterface $context_handler, ContextRepositoryInterface $context_repository ) {
parent::__construct($entity_type);
$this->contextHandler = $context_handler;
$this->contextRepository = $context_repository;
}
/**
* {@inheritdoc}
*/
protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
/** @var \Drupal\block\BlockInterface $entity */
if ($operation != 'view') {
return parent::checkAccess($entity, $operation, $account);
}
// Don't grant access to disabled blocks.
if (!$entity->status()) {
return AccessResult::forbidden()->addCacheableDependency($entity);
}
else {
$conditions = [];
$missing_context = FALSE;
foreach ($entity->getVisibilityConditions() as $condition_id => $condition) {
if ($condition instanceof ContextAwarePluginInterface) {
try {
$contexts = $this->contextRepository->getRuntimeContexts(array_values($condition->getContextMapping()));
$this->contextHandler->applyContextMapping($condition, $contexts);
}
catch (ContextException $e) {
$missing_context = TRUE;
}
}
$conditions[$condition_id] = $condition;
}
if ($missing_context) {
// If any context is missing then we might be missing cacheable
// metadata, and don't know based on what conditions the block is
// accessible or not. For example, blocks that have a node type
// condition will have a missing context on any non-node route like the
// frontpage.
// @todo Avoid setting max-age 0 for some or all cases, for example by
// treating available contexts without value differently in
// https://www.drupal.org/node/2521956.
$access = AccessResult::forbidden()->setCacheMaxAge(0);
}
elseif ($this->resolveConditions($conditions, 'and') !== FALSE) {
// Delegate to the plugin.
$block_plugin = $entity->getPlugin();
try {
if ($block_plugin instanceof ContextAwarePluginInterface) {
$contexts = $this->contextRepository->getRuntimeContexts(array_values($block_plugin->getContextMapping()));
$this->contextHandler->applyContextMapping($block_plugin, $contexts);
}
$access = $block_plugin->access($account, TRUE);
}
catch (ContextException $e) {
// Setting access to forbidden if any context is missing for the same
// reasons as with conditions (described in the comment above).
// @todo Avoid setting max-age 0 for some or all cases, for example by
// treating available contexts without value differently in
// https://www.drupal.org/node/2521956.
$access = AccessResult::forbidden()->setCacheMaxAge(0);
}
}
else {
$access = AccessResult::forbidden();
}
$this->mergeCacheabilityFromConditions($access, $conditions);
// Ensure that access is evaluated again when the block changes.
return $access->addCacheableDependency($entity);
}
}
/**
* Merges cacheable metadata from conditions onto the access result object.
*
* @param \Drupal\Core\Access\AccessResult $access
* The access result object.
* @param \Drupal\Core\Condition\ConditionInterface[] $conditions
* List of visibility conditions.
*/
protected function mergeCacheabilityFromConditions(AccessResult $access, array $conditions) {
foreach ($conditions as $condition) {
if ($condition instanceof CacheableDependencyInterface) {
$access->addCacheTags($condition->getCacheTags());
$access->addCacheContexts($condition->getCacheContexts());
$access->setCacheMaxAge(Cache::mergeMaxAges($access->getCacheMaxAge(), $condition->getCacheMaxAge()));
}
}
}
}