import re import crack from django.core import validators from django.core.exceptions import ValidationError from django.utils.translation import ugettext_lazy as _ from IPy import IP def validate_ipv4_address(value): msg = _("%s is not a valid IPv4 address") % value try: ip = IP(value) except: raise ValidationError(msg) if ip.version() != 4: raise ValidationError(msg) def validate_ipv6_address(value): msg = _("%s is not a valid IPv6 address") % value try: ip = IP(value) except: raise ValidationError(msg) if ip.version() != 6: raise ValidationError(msg) def validate_name(value): """ A single non-empty line of free-form text with no whitespace. """ validators.RegexValidator('^\w+$', _("Enter a valid name (text without whitspaces)."), 'invalid')(value) def validate_ascii(value): try: value.decode('ascii') except UnicodeDecodeError: raise ValidationError('This is not an ASCII string.') def validate_hostname(hostname): """ Ensures that each segment * contains at least one character and a maximum of 63 characters * consists only of allowed characters * doesn't begin or end with a hyphen. http://stackoverflow.com/a/2532344 """ if len(hostname) > 255: return False if hostname[-1] == ".": hostname = hostname[:-1] # strip exactly one dot from the right, if present allowed = re.compile("(?!-)[A-Z\d-]{1,63}(?