Controller/Adminhtml/FastlyCdn/Blocking/Blocking.php
private function prepareAcls($blockedAcls)
    {
        $result = '';

        if ($blockedAcls != null) {
            $blockedAclsPieces = explode(",", $blockedAcls);
            foreach ($blockedAclsPieces as $acl) {
                $result .= ' req.http.Fastly-Client-Ip ~ ' . $acl . ' ||';
            }
        }

        return $result;
    }
private function prepareAcls($blockedAcls)
    {
        $result = '';

        if ($blockedAcls != null) {
            $blockedAclsPieces = explode(",", $blockedAcls);
            foreach ($blockedAclsPieces as $acl) {
                $result .= ' req.http.Fastly-Client-Ip ~ ' . $acl . ' ||';
            }
        }

        return $result;
    }
Prepares ACL VCL snippets

@param $blockedAcls
@return string