Fixed webhook so that users' full_name isn't reset to the empty string.

cloud/webhooks.py

@@ -78,9 +78,13 @@ def user_modified():
         updates['email'] = payload['email']
 
     if payload['full_name'] != db_user['full_name']:
-        my_log.info('User changed full name from %s to %s',
+        my_log.info('User changed full name from %r to %r',
                     payload['full_name'], db_user['full_name'])
+        if payload['full_name']:
             updates['full_name'] = payload['full_name']
+        else:
+            # Fall back to the username when the full name was erased.
+            updates['full_name'] = db_user['username']
 
     if updates:
         update_res = users_coll.update_one({'_id': db_user['_id']},

tests/test_webhooks.py

@@ -35,6 +35,29 @@ class UserModifiedTest(AbstractCloudTest):
         self.assertEqual('ကြယ်ဆွတ်', db_user['full_name'])
         self.assertEqual(['subscriber'], db_user['roles'])
 
+    def test_clear_full_name(self):
+        """An empty full name should make it fall back to the username"""
+        payload = {'id': 1112333,
+                   'old_email': 'old@email.address',
+                   'full_name': '',
+                   'email': 'old@email.address',
+                   'roles': ['cloud_subscriber']}
+        as_json = json.dumps(payload).encode()
+        mac = hmac.new(self.hmac_secret,
+                       as_json, hashlib.sha256)
+        self.post('/api/webhooks/user-modified',
+                  data=as_json,
+                  content_type='application/json',
+                  headers={'X-Webhook-HMAC': mac.hexdigest()},
+                  expected_status=204)
+
+        # Check the effect on the user
+        db_user = self.fetch_user_from_db(self.uid)
+        self.assertNotEqual('', db_user['username'])
+        self.assertEqual('old@email.address', db_user['email'])
+        self.assertEqual(db_user['username'], db_user['full_name'])
+        self.assertEqual(['subscriber'], db_user['roles'])
+
     def test_change_email(self):
         payload = {'id': 1112333,
                    'old_email': 'old@email.address',