SimpleSAML\Utils\HTTP::checkSessionCookie PHP Method

    public static function checkSessionCookie($retryURL = null)
    {
        if (!is_string($retryURL) && !is_null($retryURL)) {
            throw new \InvalidArgumentException('Invalid input parameters.');
        }
        $session = \SimpleSAML_Session::getSessionFromRequest();
        if ($session->hasSessionCookie()) {
            return;
        }
        // we didn't have a session cookie. Redirect to the no-cookie page
        $url = Module::getModuleURL('core/no_cookie.php');
        if ($retryURL !== null) {
            $url = self::addURLParameters($url, array('retryURL' => $retryURL));
        }
        self::redirectTrustedURL($url);
    }

 /**
  * Receive an authentication request.
  *
  * @param SimpleSAML_IdP $idp  The IdP we are receiving it for.
  */
 public static function receiveAuthnRequest(SimpleSAML_IdP $idp)
 {
     if (isset($_REQUEST['cookieTime'])) {
         $cookieTime = (int) $_REQUEST['cookieTime'];
         if ($cookieTime + 5 > time()) {
             /*
              * Less than five seconds has passed since we were
              * here the last time. Cookies are probably disabled.
              */
             \SimpleSAML\Utils\HTTP::checkSessionCookie(\SimpleSAML\Utils\HTTP::getSelfURL());
         }
     }
     if (!isset($_REQUEST['providerId'])) {
         throw new SimpleSAML_Error_BadRequest('Missing providerId parameter.');
     }
     $spEntityId = (string) $_REQUEST['providerId'];
     if (!isset($_REQUEST['shire'])) {
         throw new SimpleSAML_Error_BadRequest('Missing shire parameter.');
     }
     $shire = (string) $_REQUEST['shire'];
     if (isset($_REQUEST['target'])) {
         $target = $_REQUEST['target'];
     } else {
         $target = NULL;
     }
     SimpleSAML\Logger::info('Shib1.3 - IdP.SSOService: Got incoming Shib authnRequest from ' . var_export($spEntityId, TRUE) . '.');
     $metadata = SimpleSAML_Metadata_MetaDataStorageHandler::getMetadataHandler();
     $spMetadata = $metadata->getMetaDataConfig($spEntityId, 'shib13-sp-remote');
     $found = FALSE;
     foreach ($spMetadata->getEndpoints('AssertionConsumerService') as $ep) {
         if ($ep['Binding'] !== 'urn:oasis:names:tc:SAML:1.0:profiles:browser-post') {
             continue;
         }
         if ($ep['Location'] !== $shire) {
             continue;
         }
         $found = TRUE;
         break;
     }
     if (!$found) {
         throw new Exception('Invalid AssertionConsumerService for SP ' . var_export($spEntityId, TRUE) . ': ' . var_export($shire, TRUE));
     }
     SimpleSAML_Stats::log('saml:idp:AuthnRequest', array('spEntityID' => $spEntityId, 'protocol' => 'saml1'));
     $sessionLostURL = \SimpleSAML\Utils\HTTP::addURLParameters(\SimpleSAML\Utils\HTTP::getSelfURL(), array('cookieTime' => time()));
     $state = array('Responder' => array('sspmod_saml_IdP_SAML1', 'sendResponse'), 'SPMetadata' => $spMetadata->toArray(), SimpleSAML_Auth_State::RESTART => $sessionLostURL, 'saml:shire' => $shire, 'saml:target' => $target, 'saml:AuthnRequestReceivedAt' => microtime(TRUE));
     $idp->handleAuthenticationRequest($state);
 }