code: def get_itoken(self, env):
          
          if not self.itoken or self.itoken_expires < time() or \
                  env.get('HTTP_X_AUTH_NEW_TOKEN', 'false').lower() in \
                  TRUE_VALUES:
              self.itoken = '%sitk%s' % (self.reseller_prefix, uuid4().hex)
              memcache_key = '%s/auth/%s' % (self.reseller_prefix, self.itoken)
              self.itoken_expires = time() + self.token_life
              memcache_client = cache_from_env(env)
              if not memcache_client:
                  raise Exception(
                      'No memcache set up; required for Swauth middleware')
              memcache_client.set(
                  memcache_key,
                  (self.itoken_expires,
                   '.auth,.reseller_admin,%s.auth' % self.reseller_prefix),
                  time=self.token_life)
          return self.itoken
docs: Returns the current internal token to use for the auth system's own
          actions with other services. Each process will create its own
          itoken and the token will be deleted and recreated based on the
          token_life configuration value. The itoken information is stored in
          memcache because the auth process that is asked by Swift to validate
          the token may not be the same as the auth process that created the
          token.