SAML bug fixes

* Fix error casting request_xml to bytes when request_xml is an object

Author: RouganStriker

djangosaml2/views.py

@@ -48,6 +48,7 @@
 from saml2.ident import code, decode
 from saml2.sigver import MissingKey
 from saml2.s_utils import UnsupportedBinding
+from saml2.samlp import AuthnRequest
 from saml2.response import (
     StatusError, StatusAuthnFailed, SignatureError, StatusRequestDenied,
     UnsolicitedResponse, StatusNoAuthnContext,
@@ -227,6 +228,9 @@ def login(request,
                 **kwargs)
             try:
                 if PY3:
+                    if isinstance(request_xml, AuthnRequest):
+                        # request_xml will be an instance of AuthnRequest if the message is not signed
+                        request_xml = str(request_xml)
                     saml_request = base64.b64encode(binary_type(request_xml, 'UTF-8')).decode('utf-8')
                 else:
                     saml_request = base64.b64encode(binary_type(request_xml))