Source code for localflavor.cz.forms
"""Czech-specific form helpers."""
import re
from django.core.exceptions import ImproperlyConfigured
from django.forms import ValidationError
from django.forms.fields import CharField, RegexField, Select
from django.utils.translation import gettext_lazy as _
from .cz_regions import REGION_CHOICES
birth_number = re.compile(r'^(?P<birth>\d{6})/?(?P<id>\d{3,4})$')
ic_number = re.compile(r'^(?P<number>\d{7})(?P<check>\d)$')
[docs]class CZRegionSelect(Select):
"""A select widget widget with list of Czech regions as choices."""
def __init__(self, attrs=None):
super().__init__(attrs, choices=REGION_CHOICES)
[docs]class CZPostalCodeField(RegexField):
"""
A form field that validates its input as Czech postal code.
Valid form is XXXXX or XXX XX, where X represents integer.
"""
default_error_messages = {
'invalid': _('Enter a postal code in the format XXXXX or XXX XX.'),
}
def __init__(self, **kwargs):
super().__init__(r'^\d{5}$|^\d{3} \d{2}$', **kwargs)
[docs] def clean(self, value):
"""
Validates the input and returns a string that contains only numbers.
Returns an empty string for empty values.
"""
value = super().clean(value)
if value in self.empty_values:
return value
return value.replace(' ', '')
[docs]class CZBirthNumberField(CharField):
"""Czech birth number form field."""
default_error_messages = {
'invalid_format': _('Enter a birth number in the format XXXXXX/XXXX or XXXXXXXXXX.'),
'invalid': _('Enter a valid birth number.'),
}
[docs] def clean(self, value):
value = super().clean(value)
if value in self.empty_values:
return value
match = re.match(birth_number, value)
if not match:
raise ValidationError(self.error_messages['invalid_format'], code='invalid_format')
birth, id = match.groupdict()['birth'], match.groupdict()['id']
# Three digits for verification number were used until 1. january 1954
if len(id) == 3 and int(birth[:2]) < 54:
return '%s' % value
# Birth number is in format YYMMDD. Females have month value raised by 50.
# In case that all possible number are already used (for given date),
# the month field is raised by 20.
month = int(birth[2:4])
if (not 1 <= month <= 12) and (not 21 <= month <= 32) and \
(not 51 <= month <= 62) and (not 71 <= month <= 82):
raise ValidationError(self.error_messages['invalid'], code='invalid')
day = int(birth[4:6])
if not (1 <= day <= 31):
raise ValidationError(self.error_messages['invalid'], code='invalid')
# Fourth digit has been added since 1. January 1954.
# It is modulo of dividing birth number and verification number by 11.
# If the modulo were 10, the last number was 0 (and therefore, the whole
# birth number wasn't divisable by 11. These number are no longer used (since 1985)
# and the condition 'modulo == 10' can be removed in 2085.
modulo = int(birth + id[:3]) % 11
if (modulo == int(id[-1])) or (modulo == 10 and id[-1] == '0'):
return '%s' % value
else:
raise ValidationError(self.error_messages['invalid'], code='invalid')
[docs]class CZICNumberField(CharField):
"""Czech IC number form field."""
default_error_messages = {
'invalid': _('Enter a valid IC number.'),
}
[docs] def clean(self, value):
value = super().clean(value)
if value in self.empty_values:
return value
match = re.match(ic_number, value)
if not match:
raise ValidationError(self.error_messages['invalid'], code='invalid')
number, check = match.groupdict()[
'number'], int(match.groupdict()['check'])
weighted_sum = 0
weight = 8
for digit in number:
weighted_sum += int(digit) * weight
weight -= 1
remainder = weighted_sum % 11
# remainder is equal:
# 0 or 10: last digit is 1
# 1: last digit is 0
# in other case, last digit is 11 - remainder
if (not remainder % 10 and check == 1) or \
(remainder == 1 and check == 0) or \
(check == (11 - remainder)):
return '%s' % value
raise ValidationError(self.error_messages['invalid'], code='invalid')