support-2.0.x-dev/modules/support_ticket/src/SupportTicketAccessControlHandler.php

<?php

namespace Drupal\support_ticket;

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Entity\EntityHandlerInterface;
use Drupal\Core\Entity\EntityTypeInterface;
use Drupal\Core\Field\FieldDefinitionInterface;
use Drupal\Core\Field\FieldItemListInterface;
use Drupal\Core\Entity\EntityAccessControlHandler;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Session\AccountInterface;
use Symfony\Component\DependencyInjection\ContainerInterface;

/**
 * Defines the access control handler for the support_ticket entity type.
 *
 * @see \Drupal\support_ticket\Entity\SupportTicket
 * @ingroup support_ticket_access
 */
class SupportTicketAccessControlHandler extends EntityAccessControlHandler implements EntityHandlerInterface {

  /**
   * {@inheritdoc}
   */
  public static function createInstance(ContainerInterface $container, EntityTypeInterface $entity_type) {
    return new static($entity_type);
  }

  /**
   * {@inheritdoc}
   */
  public function access(EntityInterface $entity, $operation, AccountInterface $account = NULL, $return_as_object = FALSE) {
    $account = $this->prepareUser($account);

    if ($account->hasPermission('administer support tickets')) {
      $result = AccessResult::allowed()->cachePerPermissions();
      return $return_as_object ? $result : $result->isAllowed();
    }
    if (!$account->hasPermission('access support tickets')) {
      $result = AccessResult::forbidden()->cachePerPermissions();
      return $return_as_object ? $result : $result->isAllowed();
    }
    $result = parent::access($entity, $operation, $account, TRUE)->cachePerPermissions();
    return $return_as_object ? $result : $result->isAllowed();
  }

  /**
   * {@inheritdoc}
   */
  public function createAccess($entity_bundle = NULL, AccountInterface $account = NULL, array $context = [], $return_as_object = FALSE) {
    $account = $this->prepareUser($account);

    if (!$account->hasPermission('access support tickets')) {
      $result = AccessResult::forbidden()->cachePerPermissions();
      return $return_as_object ? $result : $result->isAllowed();
    }

    $result = parent::createAccess($entity_bundle, $account, $context, TRUE)->cachePerPermissions();
    return $return_as_object ? $result : $result->isAllowed();
  }

  /**
   * {@inheritdoc}
   */
  protected function checkAccess(EntityInterface $support_ticket, $operation, AccountInterface $account) {
    /** @var \Drupal\support_ticket\SupportTicketInterface $support_ticket */
    // Fetch information from the support_ticket object if possible.
    $status = $support_ticket->isPublished();
    $uid = $support_ticket->getOwnerId();

    // Check if authors can view their own unpublished support tickets.
    if ($operation === 'view' && !$status && $account->hasPermission('view own unpublished support tickets') && $account->isAuthenticated() && $account->id() == $uid) {
      return AccessResult::allowed()->cachePerPermissions()->cachePerUser()->cacheUntilEntityChanges($support_ticket);
    }

    if ($operation === 'view') {
      return AccessResult::allowedIf($status)->cacheUntilEntityChanges($support_ticket);
    }

    // No opinion.
    return AccessResult::neutral();
  }

  /**
   * {@inheritdoc}
   */
  protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
    return AccessResult::allowedIf($account->hasPermission('create ' . $entity_bundle . ' ticket'))->cachePerPermissions();
  }

  /**
   * {@inheritdoc}
   */
  protected function checkFieldAccess($operation, FieldDefinitionInterface $field_definition, AccountInterface $account, FieldItemListInterface $items = NULL) {
    // Only users with the administer support tickets permission
    // can edit administrative fields.
    $administrative_fields = ['uid', 'status', 'created', 'locked'];
    if ($operation == 'edit' && in_array($field_definition->getName(), $administrative_fields, TRUE)) {
      return AccessResult::allowedIfHasPermission($account, 'administer support tickets');
    }

    // No user can change read only fields.
    $read_only_fields = ['revision_timestamp', 'revision_uid'];
    if ($operation == 'edit' && in_array($field_definition->getName(), $read_only_fields, TRUE)) {
      return AccessResult::forbidden();
    }

    // Users have access to the revision_log field either if they have
    // administrative permissions or if the new revision option is enabled.
    if ($operation == 'edit' && $field_definition->getName() == 'revision_log') {
      if ($account->hasPermission('administer support tickets')) {
        return AccessResult::allowed()->cachePerPermissions();
      }
      return AccessResult::allowedIf($items->getEntity()->support_ticket_type->entity->isNewRevision())->cachePerPermissions();
    }
    return parent::checkFieldAccess($operation, $field_definition, $account, $items);
  }

}