don't present meaningless username option in notebook

username isn't used for anything other than hash input
for authentication, so remove the field in the login form
and just use a uuid.

IPython/frontend/html/notebook/handlers.py

@@ -18,6 +18,7 b' Authors:'
 
 import logging
 import Cookie
+import uuid
 
 from tornado import web
 from tornado import websocket
@@ -68,7 +69,7 b' class LoginHandler(AuthenticatedHandler):'
     def post(self):
         pwd = self.get_argument("password", default=u'')
         if self.application.password and pwd == self.application.password:
-            self.set_secure_cookie("user", self.get_argument("name", default=u''))
+            self.set_secure_cookie("user", str(uuid.uuid4()))
         url = self.get_argument("next", default="/")
         self.redirect(url)
 

IPython/frontend/html/notebook/templates/login.html

@@ -41,7 +41,6 b' function add_next_to_action(){'
     
     <div id="content_panel">
         <form action="/login" method="post">
-            Name: <input type="text" name="name" value="{{user_id}}">
             Password: <input type="password" name="password">
             <input type="submit" value="Sign in">
         </form>