Tiny, simple GAE (google app engine) app

I need an extremely simple app that when loaded will show an html form with two fields: "ID" and "Comment text", and a "submit" button. When submitting, the backend should post a request of a json { "id": ... , "text":..., "timestamp":... , "username":.... } to a fixed, predefined URL. This post shouldn't be with urllib2 but with an api python module of a certain popular web service I'll give you. The api usage is trivial, just to call [login to view URL](URL, json). The app should also have a standard user management, so that I as the admin can create users and give each of them permission to use this page, and the logged in username should be included in the json . The page should redirect to a login page if there no authenticated user session. Please indicate with your bid exactly how soon you can deliver this. Thanks