class OpenIdLoginHandler(webapp.RequestHandler):
  def get(self):
    continue_url = self.request.GET.get('continue', '/')

    username, password = None, None
    # see if we have gotten some Form Data
    if not (username and password):
      username = self.request.get('username').strip()
      password = self.request.get('password').strip()

    # verify password
    if username:
      credential = models.Credential.get_by_key_name(username)
      if credential and credential.secret == password:
        # successfull login
        session = get_current_session()
        if session.is_active():
            session.terminate() # clean previous session
        session['uid'] = credential.uid
        # redirect back where we came from
        if not continue_url:
            continue_url = '/'
        self.redirect(continue_url)
        return

    # Render Template with Login form
    path = os.path.join(os.path.dirname(__file__), 'templates/login.html')
    self.response.out.write(template.render(path, {'continue': continue_url, 'domains': ALLOWED_DOMAINS}))