Add get_last_authn_contexts method

Author: pitbulk

README.md

@@ -940,6 +940,7 @@ Main class of OneLogin Python Toolkit
 * ***get_sso_url*** Gets the SSO url.
 * ***get_slo_url*** Gets the SLO url.
 * ***get_last_request_id*** The ID of the last Request SAML message generated (AuthNRequest, LogoutRequest).
+* ***get_last_authn_contexts*** Returns the list of authentication contexts sent in the last SAML Response.
 * ***build_request_signature*** Builds the Signature of the SAML Request.
 * ***build_response_signature*** Builds the Signature of the SAML Response.
 * ***get_settings*** Returns the settings info.

src/onelogin/saml2/auth.py

@@ -202,6 +202,13 @@ def redirect_to(self, url=None, parameters={}):
             url = self.__request_data['get_data']['RelayState']
         return OneLogin_Saml2_Utils.redirect(url, parameters, request_data=self.__request_data)
 
+    def get_last_authn_contexts(self):
+        """
+        :returns: The list of authentication contexts sent in the last SAML Response.
+        :rtype: list
+        """
+        return self.__last_authn_contexts
+
     def is_authenticated(self):
         """
         Checks if the user is authenticated or not.

tests/src/OneLogin/saml2_tests/auth_test.py

@@ -1053,6 +1053,19 @@ def testGetLastAuthnRequest(self):
         )
         self.assertIn(expectedFragment, auth.get_last_request_xml())
 
+    def testGetLastAuthnContexts(self):
+        settings = self.loadSettingsJSON()
+        request_data = self.get_request()
+        message = self.file_contents(join(self.data_path, 'responses', 'valid_response.xml.base64'))
+        del request_data['get_data']
+        request_data['post_data'] = {
+            'SAMLResponse': message
+        }
+        auth = OneLogin_Saml2_Auth(request_data, old_settings=settings)
+
+        auth.process_response()
+        self.assertEqual(auth.get_last_authn_contexts(), ['urn:oasis:names:tc:SAML:2.0:ac:classes:Password'])
+
     def testGetLastLogoutRequest(self):
         settings = self.loadSettingsJSON()
         auth = OneLogin_Saml2_Auth({'http_host': 'localhost', 'script_name': 'thing'}, old_settings=settings)