public function send(EngineBlock_Saml2_MessageAnnotationDecorator $message, AbstractRole $remoteEntity)
 {
     $bindingUrn = $message->getDeliverByBinding();
     $sspMessage = $message->getSspMessage();
     if ($bindingUrn === 'INTERNAL') {
         $this->sendInternal($message);
         return;
     }
     if ($this->shouldMessageBeSigned($sspMessage, $remoteEntity)) {
         $keyPair = $this->_server->getSigningCertificates();
         $sspMessage->setCertificates(array($keyPair->getCertificate()->toPem()));
         $sspMessage->setSignatureKey($keyPair->getPrivateKey()->toXmlSecurityKey());
     }
     $sspBinding = SAML2_Binding::getBinding($bindingUrn);
     if ($sspBinding instanceof SAML2_HTTPPost) {
         // SAML2int dictates that we MUST sign assertions.
         // The SAML2 library will do that for us, if we just set the key to sign with.
         if ($sspMessage instanceof SAML2_Response) {
             foreach ($sspMessage->getAssertions() as $assertion) {
                 $assertion->setCertificates($sspMessage->getCertificates());
                 $assertion->setSignatureKey($sspMessage->getSignatureKey());
             }
             // BWC dictates that we don't sign responses.
             $messageElement = $sspMessage->toUnsignedXML();
         } else {
             $messageElement = $sspMessage->toSignedXML();
         }
         $xml = $messageElement->ownerDocument->saveXML($messageElement);
         $this->validateXml($xml);
         $extra = '';
         $extra .= method_exists($message, 'getReturn') ? '<input type="hidden" name="return" value="' . htmlspecialchars($message->getReturn()) . '">' : '';
         $extra .= $sspMessage->getRelayState() ? '<input type="hidden" name="RelayState" value="' . htmlspecialchars($sspMessage->getRelayState()) . '">' : '';
         $encodedMessage = htmlspecialchars(base64_encode($xml));
         $action = $sspMessage->getDestination();
         $log = $this->_server->getSessionLog();
         $log->info('HTTP-Post: Sending Message', array('saml_message' => $xml));
         $output = $this->_server->renderTemplate('form', array('action' => $action, 'message' => $encodedMessage, 'xtra' => $extra, 'name' => $message->getMessageType(), 'trace' => $this->getTraceHtml($xml)));
         $this->_server->sendOutput($output);
     } else {
         if ($sspBinding instanceof SAML2_HTTPRedirect) {
             if ($sspMessage instanceof SAML2_Response) {
                 throw new EngineBlock_Corto_Module_Bindings_UnsupportedBindingException('May not send a Reponse via HTTP Redirect');
             }
             $url = $sspBinding->getRedirectURL($sspMessage);
             $this->_server->redirect($url, $message);
         } else {
             throw new EngineBlock_Corto_Module_Bindings_Exception('Unsupported Binding');
         }
     }
 }