Fix: Preserve refresh token if not returned in OAuth refresh response

streamlit_oauth/__init__.py

@@ -134,7 +134,11 @@ def refresh_token(self, token, force=False):
       if token.get('refresh_token') is None:
         raise Exception("Token is expired and no refresh token is available")
       else:
-        token = asyncio.run(self.client.refresh_token(token.get('refresh_token')))
+        new_token = asyncio.run(self.client.refresh_token(token.get('refresh_token')))
+        # Keep the old refresh token if the new one is missing it
+        if not new_token.get('refresh_token'):
+          new_token['refresh_token'] = token.get('refresh_token')
+        token = new_token
     return token
 
   def revoke_token(self, token, token_type_hint="access_token"):

tests/test_oauth_component.py

@@ -48,6 +48,7 @@ def test_refresh_token_expired(monkeypatch):
     result = oauth.refresh_token(token)
 
     assert result["access_token"] == "new"
+    assert "refresh_token" in result
 
 
 def test_revoke_token(monkeypatch):