class MediaAccessControlHandler

class MediaAccessControlHandler extends EntityAccessControlHandler {
    
    /**
     * {@inheritdoc}
     */
    protected function checkAccess(EntityInterface $entity, $operation, AccountInterface $account) {
        if ($account->hasPermission('administer media')) {
            return AccessResult::allowed()->cachePerPermissions();
        }
        $type = $entity->bundle();
        $is_owner = $account->id() && $account->id() === $entity->getOwnerId();
        switch ($operation) {
            case 'view':
                if ($entity->isPublished()) {
                    $access_result = AccessResult::allowedIf($account->hasPermission('view media'))
                        ->cachePerPermissions()
                        ->addCacheableDependency($entity);
                    if (!$access_result->isAllowed()) {
                        $access_result->setReason("The 'view media' permission is required when the media item is published.");
                    }
                }
                elseif ($account->hasPermission('view own unpublished media')) {
                    $access_result = AccessResult::allowedIf($is_owner)->cachePerPermissions()
                        ->cachePerUser()
                        ->addCacheableDependency($entity);
                    if (!$access_result->isAllowed()) {
                        $access_result->setReason("The user must be the owner and the 'view own unpublished media' permission is required when the media item is unpublished.");
                    }
                }
                else {
                    $access_result = AccessResult::neutral()->cachePerPermissions()
                        ->addCacheableDependency($entity)
                        ->setReason("The user must be the owner and the 'view own unpublished media' permission is required when the media item is unpublished.");
                }
                return $access_result;
            case 'update':
                if ($account->hasPermission('edit any ' . $type . ' media')) {
                    return AccessResult::allowed()->cachePerPermissions();
                }
                if ($account->hasPermission('edit own ' . $type . ' media') && $is_owner) {
                    return AccessResult::allowed()->cachePerPermissions()
                        ->cachePerUser()
                        ->addCacheableDependency($entity);
                }
                // @todo Deprecate this permission in
                // https://www.drupal.org/project/drupal/issues/2925459.
                if ($account->hasPermission('update any media')) {
                    return AccessResult::allowed()->cachePerPermissions();
                }
                if ($account->hasPermission('update media') && $is_owner) {
                    return AccessResult::allowed()->cachePerPermissions()
                        ->cachePerUser()
                        ->addCacheableDependency($entity);
                }
                return AccessResult::neutral("The following permissions are required: 'update any media' OR 'update own media' OR '{$type}: edit any media' OR '{$type}: edit own media'.")->cachePerPermissions();
            case 'delete':
                if ($account->hasPermission('delete any ' . $type . ' media')) {
                    return AccessResult::allowed()->cachePerPermissions();
                }
                if ($account->hasPermission('delete own ' . $type . ' media') && $is_owner) {
                    return AccessResult::allowed()->cachePerPermissions()
                        ->cachePerUser()
                        ->addCacheableDependency($entity);
                }
                // @todo Deprecate this permission in
                // https://www.drupal.org/project/drupal/issues/2925459.
                if ($account->hasPermission('delete any media')) {
                    return AccessResult::allowed()->cachePerPermissions();
                }
                if ($account->hasPermission('delete media') && $is_owner) {
                    return AccessResult::allowed()->cachePerPermissions()
                        ->cachePerUser()
                        ->addCacheableDependency($entity);
                }
                return AccessResult::neutral("The following permissions are required: 'delete any media' OR 'delete own media' OR '{$type}: delete any media' OR '{$type}: delete own media'.")->cachePerPermissions();
            default:
                return AccessResult::neutral()->cachePerPermissions();
        }
    }
    
    /**
     * {@inheritdoc}
     */
    protected function checkCreateAccess(AccountInterface $account, array $context, $entity_bundle = NULL) {
        $permissions = [
            'administer media',
            'create media',
            'create ' . $entity_bundle . ' media',
        ];
        return AccessResult::allowedIfHasPermissions($account, $permissions, 'OR');
    }

}