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"""Finland."""
# standard
from functools import lru_cache
import re
# local
from validators.utils import validator
@lru_cache
def _business_id_pattern():
"""Business ID Pattern."""
return re.compile(r"^[0-9]{7}-[0-9]$")
@lru_cache
def _ssn_pattern(ssn_check_marks: str):
"""SSN Pattern."""
return re.compile(
r"""^
(?P<date>(0[1-9]|[1-2]\d|3[01])
(0[1-9]|1[012])
(\d{{2}}))
[ABCDEFYXWVU+-]
(?P<serial>(\d{{3}}))
(?P<checksum>[{check_marks}])$""".format(check_marks=ssn_check_marks),
re.VERBOSE,
)
@validator
def fi_business_id(value: str, /):
"""Validate a Finnish Business ID.
Each company in Finland has a distinct business id. For more
information see [Finnish Trade Register][1]
[1]: http://en.wikipedia.org/wiki/Finnish_Trade_Register
Examples:
>>> fi_business_id('0112038-9') # Fast Monkeys Ltd
True
>>> fi_business_id('1234567-8') # Bogus ID
ValidationError(func=fi_business_id, args={'value': '1234567-8'})
Args:
value:
Business ID string to be validated.
Returns:
(Literal[True]): If `value` is a valid finnish business id.
(ValidationError): If `value` is an invalid finnish business id.
"""
if not value:
return False
if not re.match(_business_id_pattern(), value):
return False
factors = [7, 9, 10, 5, 8, 4, 2]
numbers = map(int, value[:7])
checksum = int(value[8])
modulo = sum(f * n for f, n in zip(factors, numbers)) % 11
return (11 - modulo == checksum) or (modulo == checksum == 0)
@validator
def fi_ssn(value: str, /, *, allow_temporal_ssn: bool = True):
"""Validate a Finnish Social Security Number.
This validator is based on [django-localflavor-fi][1].
[1]: https://github.com/django/django-localflavor-fi/
Examples:
>>> fi_ssn('010101-0101')
True
>>> fi_ssn('101010-0102')
ValidationError(func=fi_ssn, args={'value': '101010-0102'})
Args:
value:
Social Security Number to be validated.
allow_temporal_ssn:
Whether to accept temporal SSN numbers. Temporal SSN numbers are the
ones where the serial is in the range [900-999]. By default temporal
SSN numbers are valid.
Returns:
(Literal[True]): If `value` is a valid finnish SSN.
(ValidationError): If `value` is an invalid finnish SSN.
"""
if not value:
return False
ssn_check_marks = "0123456789ABCDEFHJKLMNPRSTUVWXY"
if not (result := re.match(_ssn_pattern(ssn_check_marks), value)):
return False
gd = result.groupdict()
checksum = int(gd["date"] + gd["serial"])
return (
int(gd["serial"]) >= 2
and (allow_temporal_ssn or int(gd["serial"]) <= 899)
and ssn_check_marks[checksum % len(ssn_check_marks)] == gd["checksum"]
)