salt/utils/validate/user.py
# -*- coding: utf-8 -*-
'''
Various user validation utilities
'''
from __future__ import absolute_import, print_function, unicode_literals
# Import python libs
import re
import logging
from salt.ext import six
log = logging.getLogger(__name__)
VALID_USERNAME = re.compile(r'[a-z_][a-z0-9_-]*[$]?', re.IGNORECASE)
def valid_username(user):
'''
Validates a username based on the guidelines in `useradd(8)`
'''
if not isinstance(user, six.string_types):
return False
if len(user) > 32:
return False
return VALID_USERNAME.match(user) is not None