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import re
from .utils import validator
user_regex = re.compile(
# dot-atom
r"(^[-!#$%&'*+/=?^_`{}|~0-9A-Z]+"
r"(\.[-!#$%&'*+/=?^_`{}|~0-9A-Z]+)*$"
# quoted-string
r'|^"([\001-\010\013\014\016-\037!#-\[\]-\177]|'
r"""\\[\001-\011\013\014\016-\177])*"$)""",
re.IGNORECASE
)
domain_regex = re.compile(
# domain
r'(?:[A-Z0-9](?:[A-Z0-9-]{0,61}[A-Z0-9])?\.)+'
r'(?:[A-Z]{2,6}\.?|[A-Z0-9-]{2,}\.?$)'
# literal form, ipv4 address (SMTP 4.1.3)
r'|^\[(25[0-5]|2[0-4]\d|[0-1]?\d?\d)'
r'(\.(25[0-5]|2[0-4]\d|[0-1]?\d?\d)){3}\]$',
re.IGNORECASE)
domain_whitelist = ['localhost']
@validator
def email(value, whitelist=None):
"""
Validate an email address.
This validator is based on `Django's email validator`_. Returns
``True`` on success and :class:`~validators.utils.ValidationFailure`
when validation fails.
Examples::
>>> email('someone@example.com')
True
>>> email('bogus@@')
ValidationFailure(func=email, ...)
.. _Django's email validator:
https://github.com/django/django/blob/master/django/core/validators.py
.. versionadded:: 0.1
:param value: value to validate
:param whitelist: domain names to whitelist
:copyright: (c) Django Software Foundation and individual contributors.
:license: BSD
"""
if whitelist is None:
whitelist = domain_whitelist
if not value or '@' not in value:
return False
user_part, domain_part = value.rsplit('@', 1)
if not user_regex.match(user_part):
return False
if len(user_part.encode("utf-8")) > 64:
return False
if domain_part not in whitelist and not domain_regex.match(domain_part):
# Try for possible IDN domain-part
try:
domain_part = domain_part.encode('idna').decode('ascii')
return domain_regex.match(domain_part)
except UnicodeError:
return False
return True
|
