oauth_google_login: support refresh when refresh_token is still valid

When refresh_token is still valid google's endpoint does not include the
current refresh token in the response when refreshing the token, we need
to keep the current one.
This fixes user logout every one hour.

bt5/erp5_oauth_google_login/DocumentTemplateItem/portal_components/document.erp5.GoogleConnector.py

@@ -96,11 +96,12 @@ class GoogleConnector(XMLObject):
 
     Used by Products.ERP5Security.ERP5ExternalOauth2ExtractionPlugin
     """
+    refresh_token = token['refresh_token']
     body = self._getOAuthlibClient().prepare_refresh_body(
       client_id=self.getClientId(),
       client_secret=self.getSecretKey(),
       access_type="offline",
-      refresh_token=token['refresh_token'],
+      refresh_token=refresh_token,
     )
     resp = requests.post(
       TOKEN_URL,
@@ -110,7 +111,9 @@ class GoogleConnector(XMLObject):
     )
     if not resp.ok:
       return {}
-    return self._getGoogleTokenFromJSONResponse(resp.json())
+    new_token = resp.json()
+    new_token.setdefault('refresh_token', refresh_token)
+    return self._getGoogleTokenFromJSONResponse(new_token)
 
   @security.private
   def getUserEntry(self, access_token):

bt5/erp5_oauth_google_login/TestTemplateItem/portal_components/test.erp5.testGoogleLogin.py

@@ -310,7 +310,7 @@ class TestGoogleLogin(GoogleLoginTestCase):
       resp = self.publish(self.portal.getPath(), env=env)
       self.assertEqual(resp.getStatus(), six.moves.http_client.OK)
 
-    def token_callback(request):
+    def _check_token_callback_request(request, refresh_token):
       self.assertEqual(
         request.headers['Content-Type'],
         'application/x-www-form-urlencoded')
@@ -321,33 +321,78 @@ class TestGoogleLogin(GoogleLoginTestCase):
           'client_id': self.client_id,
           'client_secret': self.secret_key,
           'grant_type': 'refresh_token',
-          'refresh_token': self.refresh_token,
+          'refresh_token': refresh_token,
         }
       )
+
+    def _userinfo_callback(request, access_token):
+      self.assertEqual(
+        request.headers['Authorization'],
+        'Bearer ' + access_token)
+      return 200, {}, json.dumps({
+        "first_name": "John",
+        "last_name": "Doe",
+        "email": self.default_google_login_email_address,
+      })
+
+    def token_callback_1(request):
+      # First refresh, the refresh token is still valid, so it is not
+      # included in the response, the client gets a new access_token
+      # and will re-use the same refresh_token
+      _check_token_callback_request(request, self.refresh_token)
       return 200, {}, json.dumps({
         'access_token': 'new' + self.access_token,
+        'expires_in': 3600,
+      })
+
+    def userinfo_callback_1(request):
+      return _userinfo_callback(request, 'new' + self.access_token)
+
+    def token_callback_2(request):
+      # Second refresh, the refresh token is no longer valid and a new
+      # token is included in the response, the client gets a new access_token
+      # and and a new refresh_token
+      _check_token_callback_request(request, self.refresh_token)
+      return 200, {}, json.dumps({
+        'access_token': 'newnew' + self.access_token,
         'refresh_token': 'new' + self.refresh_token,
         'expires_in': 3600,
       })
 
+    def userinfo_callback_2(request):
+      return _userinfo_callback(request, 'newnew' + self.access_token)
+
+    def token_callback_3(request):
+      # Third refresh, we check that the refresh is made with the new refresh
+      # token from second refresh.
+      _check_token_callback_request(request, 'new' + self.refresh_token)
+      return 200, {}, json.dumps({
+        'access_token': 'newnewnew' + self.access_token,
+        'expires_in': 3600,
+      })
+
+    def userinfo_callback_3(request):
+      return _userinfo_callback(request, 'newnewnew' + self.access_token)
+
+    for i, (token_callback, userinfo_callback) in enumerate(
+      zip(
+        (token_callback_1, token_callback_2, token_callback_3),
+        (userinfo_callback_1, userinfo_callback_2, userinfo_callback_3),
+      ), 1):
       with mock.patch(
           'Products.ERP5Security.ERP5ExternalOauth2ExtractionPlugin.time.time',
-        return_value=time.time() + 5000), \
+          return_value=time.time() + i * 5000), \
           responses.RequestsMock() as rsps:
         rsps.add_callback(
           responses.POST,
           'https://accounts.google.com/o/oauth2/token',
           token_callback,
         )
-      # refreshing the token calls userinfo again
-      rsps.add(
-        method='GET',
-        url='https://www.googleapis.com/oauth2/v1/userinfo',
-        json={
-          "first_name": "John",
-          "last_name": "Doe",
-          "email": self.default_google_login_email_address,
-        }
+        # refreshing the token calls userinfo again, with the new access token
+        rsps.add_callback(
+          responses.GET,
+          'https://www.googleapis.com/oauth2/v1/userinfo',
+          userinfo_callback,
         )
         resp = self.publish(self.portal.getPath(), env=env)
         self.assertEqual(resp.getStatus(), six.moves.http_client.OK)