Source code for

"""DE-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 .de_states import STATE_CHOICES

ID_RE = re.compile(r"^(?P<residence>\d{10})(?P<origin>\w{1,3})"
                   r"[-\ ]?(?P<birthday>\d{7})[-\ ]?(?P<validity>\d{7})"
                   r"[-\ ]?(?P<checksum>\d{1})$")

[docs]class DEZipCodeField(RegexField): """A form field that validates input as a German zip code. Valid zip codes consist of five digits. """ default_error_messages = { 'invalid': _('Enter a zip code in the format XXXXX.'), } def __init__(self, **kwargs): super().__init__(r'^([0]{1}[1-9]{1}|[1-9]{1}[0-9]{1})[0-9]{3}$', **kwargs)
[docs]class DEStateSelect(Select): """A Select widget that uses a list of DE states as its choices.""" def __init__(self, attrs=None): super().__init__(attrs, choices=STATE_CHOICES)
[docs]class DEIdentityCardNumberField(CharField): """A German identity card number. Checks the following rules to determine whether the number is valid: * Conforms to the XXXXXXXXXXX-XXXXXXX-XXXXXXX-X format. * No group consists entirely of zeroes. * Included checksums match calculated checksums Algorithm is documented at """ default_error_messages = { 'invalid': _('Enter a valid German identity card number in ' 'XXXXXXXXXXX-XXXXXXX-XXXXXXX-X format.'), } def has_valid_checksum(self, number): given_number, given_checksum = number[:-1], number[-1] calculated_checksum = 0 parameter = 7 for item in given_number: fragment = str(int(item) * parameter) if fragment.isalnum(): calculated_checksum += int(fragment[-1]) if parameter == 1: parameter = 7 elif parameter == 3: parameter = 1 elif parameter == 7: parameter = 3 return str(calculated_checksum)[-1] == given_checksum
[docs] def clean(self, value): value = super().clean(value) if value in self.empty_values: return value match = re.match(ID_RE, value) if not match: raise ValidationError(self.error_messages['invalid'], code='invalid') id_parts = match.groupdict() residence = id_parts['residence'] origin = id_parts['origin'] birthday = id_parts['birthday'] validity = id_parts['validity'] checksum = id_parts['checksum'] if (residence == '0000000000' or birthday == '0000000' or validity == '0000000'): raise ValidationError(self.error_messages['invalid'], code='invalid') all_digits = "%s%s%s%s" % (residence, birthday, validity, checksum) if (not self.has_valid_checksum(residence) or not self.has_valid_checksum(birthday) or not self.has_valid_checksum(validity) or not self.has_valid_checksum(all_digits)): raise ValidationError(self.error_messages['invalid'], code='invalid') return '%s%s-%s-%s-%s' % (residence, origin, birthday, validity, checksum)