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LockableConfigEntityAccessControlHandler.php in Simple OAuth (OAuth2) & OpenID Connect 8.2

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src/LockableConfigEntityAccessControlHandler.php
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<?php

namespace Drupal\simple_oauth;

use Drupal\Core\Access\AccessResult;
use Drupal\Core\Entity\EntityAccessControlHandler;
use Drupal\Core\Entity\EntityInterface;
use Drupal\Core\Session\AccountInterface;
class LockableConfigEntityAccessControlHandler extends EntityAccessControlHandler {

  /**
   * {@inheritdoc}
   */
  public function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
    if ($operation == 'view') {

      // Allow viewing the configuration entity.
      return AccessResult::allowed();
    }
    if ($entity
      ->isLocked()) {
      return AccessResult::forbidden();
    }
    return parent::checkAccess($entity, $operation, $account);
  }

}