Add additional data to custom SSO auth form extension points

common/djangoapps/third_party_auth/pipeline.py

@@ -461,7 +461,7 @@ def set_pipeline_timeout(strategy, user, *args, **kwargs):
         # choice of the user.
 
 
-def redirect_to_custom_form(request, auth_entry, user_details):
+def redirect_to_custom_form(request, auth_entry, kwargs):
     """
     If auth_entry is found in AUTH_ENTRY_CUSTOM, this is used to send provider
     data to an external server's registration/login page.
@@ -469,13 +469,18 @@ def redirect_to_custom_form(request, auth_entry, user_details):
     The data is sent as a base64-encoded values in a POST request and includes
     a cryptographic checksum in case the integrity of the data is important.
     """
+    backend_name = request.backend.name
+    provider_id = provider.Registry.get_from_pipeline({'backend': backend_name, 'kwargs': kwargs}).provider_id
     form_info = AUTH_ENTRY_CUSTOM[auth_entry]
     secret_key = form_info['secret_key']
     if isinstance(secret_key, unicode):
         secret_key = secret_key.encode('utf-8')
     custom_form_url = form_info['url']
     data_str = json.dumps({
-        "user_details": user_details
+        "auth_entry": auth_entry,
+        "backend_name": backend_name,
+        "provider_id": provider_id,
+        "user_details": kwargs['details'],
     })
     digest = hmac.new(secret_key, msg=data_str, digestmod=hashlib.sha256).digest()
     # Store the data in the session temporarily, then redirect to a page that will POST it to
@@ -537,7 +542,7 @@ def ensure_user_information(strategy, auth_entry, backend=None, user=None, socia
             raise AuthEntryError(backend, 'auth_entry is wrong. Settings requires a user.')
         elif auth_entry in AUTH_ENTRY_CUSTOM:
             # Pass the username, email, etc. via query params to the custom entry page:
-            return redirect_to_custom_form(strategy.request, auth_entry, kwargs['details'])
+            return redirect_to_custom_form(strategy.request, auth_entry, kwargs)
         else:
             raise AuthEntryError(backend, 'auth_entry invalid')
 

common/djangoapps/third_party_auth/tests/specs/test_google.py

@@ -80,13 +80,16 @@ class GoogleOauth2IntegrationTest(base.Oauth2IntegrationTest):
         data_parsed = json.loads(data_decoded)
         # The user's details get passed to the custom page as a base64 encoded query parameter:
         self.assertEqual(data_parsed, {
+            'auth_entry': 'custom1',
+            'backend_name': 'google-oauth2',
+            'provider_id': 'oa2-google-oauth2',
             'user_details': {
                 'username': 'email_value',
                 'email': 'email_value@example.com',
                 'fullname': 'name_value',
                 'first_name': 'given_name_value',
                 'last_name': 'family_name_value',
-            }
+            },
         })
         # Check the hash that is used to confirm the user's data in the GET parameter is correct
         secret_key = settings.THIRD_PARTY_AUTH_CUSTOM_AUTH_FORMS['custom1']['secret_key']

common/djangoapps/third_party_auth/views.py

@@ -74,7 +74,7 @@ def post_to_custom_auth_form(request):
     # Verify the format of pipeline_data:
     data = {
         'post_url': pipeline_data['post_url'],
-        # The user's name, email, etc. as base64 encoded JSON
+        # data: The provider info and user's name, email, etc. as base64 encoded JSON
         # It's base64 encoded because it's signed cryptographically and we don't want whitespace
         # or ordering issues affecting the hash/signature.
         'data': pipeline_data['data'],