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# Copyright © 2013-2016 Jakub Wilk <jwilk@jwilk.net>
#
# Permission is hereby granted, free of charge, to any person obtaining a copy
# of this software and associated documentation files (the “Software”), to deal
# in the Software without restriction, including without limitation the rights
# to use, copy, modify, merge, publish, distribute, sublicense, and/or sell
# copies of the Software, and to permit persons to whom the Software is
# furnished to do so, subject to the following conditions:
#
# The above copyright notice and this permission notice shall be included in
# all copies or substantial portions of the Software.
#
# THE SOFTWARE IS PROVIDED “AS IS”, WITHOUT WARRANTY OF ANY KIND, EXPRESS OR
# IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY,
# FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE
# AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER
# LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM,
# OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE
# SOFTWARE.
'''
special-use domain names
'''
# https://www.iana.org/assignments/special-use-domain-names/special-use-domain-names.xhtml
import re
_regexps = [
# RFC 1035, §3.5 <https://tools.ietf.org/html/rfc1035#section-3.5>:
'.+[.]in-addr[.]arpa',
# RFC 3596, §2.5 <https://tools.ietf.org/html/rfc3596#section-2.5>:
'.+[.]ip6[.]arpa',
# RFC 6761, §6 <https://tools.ietf.org/html/rfc6761#section-6>:
'(.+[.])?test',
'(.+[.])?localhost',
'(.+[.])?invalid',
'(.+[.])?example([.](com|net|org))?',
# RFC 6762, §3 <https://tools.ietf.org/html/rfc6762#section-3>:
'(.+[.])local',
]
_is_special = re.compile(
'^({re})$'.format(re='|'.join(_regexps))
).match
def is_special_domain(domain):
domain = domain.lower()
return _is_special(domain)
def is_email_in_special_domain(email):
_, domain = email.rsplit('@', 1)
return is_special_domain(domain)
def is_dotless_domain(domain):
return '.' not in domain
def is_email_in_dotless_domain(email):
# Technically, e-mail addresses in dotless domains are not forbidden.
# But in practice they are almost certainly mistakes.
# See also: RFC 7085 <https://tools.ietf.org/html/rfc7085>
_, domain = email.rsplit('@', 1)
return is_dotless_domain(domain)
# vim:ts=4 sts=4 sw=4 et
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