code: private function prepareAcls($allowedAcls)
      {
          $result = '';
          $aclsArray = [];
          $acls = '';
  
          if ($allowedAcls != null) {
              foreach ($allowedAcls as $key => $value) {
                  $aclsArray[] = $value['value'];
              }
              $acls = implode(',', $aclsArray);
          }
  
          $this->configWriter->save(
              Config::XML_FASTLY_WAF_ALLOW_BY_ACL,
              $acls,
              'default',
              '0'
          );
  
          if ($acls != '') {
              $allowedAclsPieces = explode(",", $acls);
              foreach ($allowedAclsPieces as $acl) {
                  $result .= ' req.http.Fastly-Client-Ip ~ ' . $acl . ' ||';
              }
          }
  
          return $result;
      }
docs: Prepares ACL VCL snippets
  
  @param $allowedAcls
  @return string