new_contents: #!/usr/bin/env python
  
  from __future__ import print_function, unicode_literals
  
  import os
  import sys
  import uuid
  
  from datetime import timedelta
  
  from aspen.utils import utcnow
  
  import gratipay
  
  from gratipay import wireup
  from gratipay.models.participant import Participant
  
  
  if len(sys.argv) < 2:
      sys.exit('Usage: %s <user>' % sys.argv[0])
  
  
  db = Participant.db = wireup.db(wireup.env())
  gratipay.RESTRICTED_USERNAMES = os.listdir('./www/')
  
  username = sys.argv[1]
  session_token = uuid.uuid4().hex
  session_expires = utcnow() + timedelta(hours=6)
  
  
  try:
      participant = Participant.from_username(username)
      participant.db = db
  except:
      participant = Participant.with_random_username()
      participant.db = db
      participant.change_username(username)
      participant.set_as_claimed()
  
  participant.update_session(session_token, session_expires)
  print(session_token)
  
subject: Add helper for JS tests