101 lines
2.9 KiB
Python
101 lines
2.9 KiB
Python
"""eMail."""
|
|
|
|
# standard
|
|
import re
|
|
|
|
# local
|
|
from .hostname import hostname
|
|
from .utils import validator
|
|
|
|
|
|
@validator
|
|
def email(
|
|
value: str,
|
|
/,
|
|
*,
|
|
ipv6_address: bool = False,
|
|
ipv4_address: bool = False,
|
|
simple_host: bool = False,
|
|
rfc_1034: bool = False,
|
|
rfc_2782: bool = False,
|
|
):
|
|
"""Validate an email address.
|
|
|
|
This was inspired from [Django's email validator][1].
|
|
Also ref: [RFC 1034][2], [RFC 5321][3] and [RFC 5322][4].
|
|
|
|
[1]: https://github.com/django/django/blob/main/django/core/validators.py#L174
|
|
[2]: https://www.rfc-editor.org/rfc/rfc1034
|
|
[3]: https://www.rfc-editor.org/rfc/rfc5321
|
|
[4]: https://www.rfc-editor.org/rfc/rfc5322
|
|
|
|
Examples:
|
|
>>> email('someone@example.com')
|
|
True
|
|
>>> email('bogus@@')
|
|
ValidationError(func=email, args={'value': 'bogus@@'})
|
|
|
|
Args:
|
|
value:
|
|
eMail string to validate.
|
|
ipv6_address:
|
|
When the domain part is an IPv6 address.
|
|
ipv4_address:
|
|
When the domain part is an IPv4 address.
|
|
simple_host:
|
|
When the domain part is a simple hostname.
|
|
rfc_1034:
|
|
Allow trailing dot in domain name.
|
|
Ref: [RFC 1034](https://www.rfc-editor.org/rfc/rfc1034).
|
|
rfc_2782:
|
|
Domain name is of type service record.
|
|
Ref: [RFC 2782](https://www.rfc-editor.org/rfc/rfc2782).
|
|
|
|
Returns:
|
|
(Literal[True]): If `value` is a valid eMail.
|
|
(ValidationError): If `value` is an invalid eMail.
|
|
"""
|
|
if not value or value.count("@") != 1:
|
|
return False
|
|
|
|
username_part, domain_part = value.rsplit("@", 1)
|
|
|
|
if len(username_part) > 64 or len(domain_part) > 253:
|
|
# ref: RFC 1034 and 5231
|
|
return False
|
|
|
|
if ipv6_address or ipv4_address:
|
|
if domain_part.startswith("[") and domain_part.endswith("]"):
|
|
# ref: RFC 5321
|
|
domain_part = domain_part.lstrip("[").rstrip("]")
|
|
else:
|
|
return False
|
|
|
|
return (
|
|
bool(
|
|
hostname(
|
|
domain_part,
|
|
skip_ipv6_addr=not ipv6_address,
|
|
skip_ipv4_addr=not ipv4_address,
|
|
may_have_port=False,
|
|
maybe_simple=simple_host,
|
|
rfc_1034=rfc_1034,
|
|
rfc_2782=rfc_2782,
|
|
)
|
|
)
|
|
if re.match(
|
|
# extended latin
|
|
r"(^[\u0100-\u017F\u0180-\u024F\u00A0-\u00FF]"
|
|
# dot-atom
|
|
+ r"|[\u0100-\u017F\u0180-\u024F\u00A0-\u00FF0-9a-z!#$%&'*+/=?^_`{}|~\-]+"
|
|
+ r"(\.[\u0100-\u017F\u0180-\u024F\u00A0-\u00FF0-9a-z!#$%&'*+/=?^_`{}|~\-]+)*$"
|
|
# quoted-string
|
|
+ r'|^"('
|
|
+ r"[\u0100-\u017F\u0180-\u024F\u00A0-\u00FF\001-\010\013\014\016-\037"
|
|
+ r"!#-\[\]-\177]|\\[\011.]"
|
|
+ r')*")$',
|
|
username_part,
|
|
re.IGNORECASE,
|
|
)
|
|
else False
|
|
)
|