public function getTokenIntrospection(Request $request, $tokenValue)
 {
     if (null === $tokenValue) {
         throw new BadRequestException('invalid_token', 'the token parameter is missing');
     }
     // FIXME: validate token format
     $accessToken = $this->db->getAccessToken($tokenValue);
     if (false === $accessToken) {
         // token does not exist
         $tokenInfo = array('active' => false);
     } elseif ($this->io->getTime() > $accessToken['issue_time'] + $accessToken['expires_in']) {
         // token expired
         $tokenInfo = array('active' => false);
     } else {
         // token exists and did not expire
         $tokenInfo = array('active' => true, 'exp' => intval($accessToken['issue_time'] + $accessToken['expires_in']), 'iat' => intval($accessToken['issue_time']), 'scope' => $accessToken['scope'], 'iss' => $request->getUrl()->getHost(), 'client_id' => $accessToken['client_id'], 'sub' => $accessToken['resource_owner_id'], 'user_id' => $accessToken['resource_owner_id'], 'token_type' => 'bearer');
         // as long as we have no RS registration we cannot set the audience...
         // $tokenInfo['aud'] => 'foo';
     }
     $response = new JsonResponse();
     $response->setHeaders(array('Cache-Control' => 'no-store', 'Pragma' => 'no-cache'));
     $response->setBody($tokenInfo);
     return $response;
 }