Develop a simple application using Google App Engine and Gmail API in Python.
This application will:
1. Allow users to login using Google oAuth (login with Google)
2. Will access their gmail accounts
3. Will parse all mail items for email header metadata (to, from, sender, date, subject, etc. I have a much longer list of metadata)
4. Will email an excel file (CSV) to the user with the metadata from all mail items