add isPassive to discovery request if about to send a passive request.

git-svn-id: https://simplesamlphp.googlecode.com/svn/trunk@3319 44740490-163a-0410-bde0-09ae8108e29a

modules/saml/lib/Auth/Source/SP.php

@@ -351,6 +351,10 @@ class sspmod_saml_Auth_Source_SP extends SimpleSAML_Auth_Source {
 			$params['IDPList'] = $state['saml:IDPList'];
 		}
 
+		if (isset($state['isPassive']) && $state['isPassive']) {
+			$params['isPassive'] = 'true';
+		}
+
 		SimpleSAML_Utilities::redirect($discoURL, $params);
 	}