/django/contrib/localflavor/de/forms.py
Python | 84 lines | 61 code | 6 blank | 17 comment | 0 complexity | ec187b2cb38dabab4b8a85de31e89f86 MD5 | raw file
Possible License(s): BSD-3-Clause
- """
- DE-specific Form helpers
- """
- from django.core.validators import EMPTY_VALUES
- from django.forms import ValidationError
- from django.forms.fields import Field, RegexField, Select
- from django.utils.translation import ugettext_lazy as _
- import re
- id_re = re.compile(r"^(?P<residence>\d{10})(?P<origin>\w{1,3})[-\ ]?(?P<birthday>\d{7})[-\ ]?(?P<validity>\d{7})[-\ ]?(?P<checksum>\d{1})$")
- class DEZipCodeField(RegexField):
- default_error_messages = {
- 'invalid': _('Enter a zip code in the format XXXXX.'),
- }
- def __init__(self, *args, **kwargs):
- super(DEZipCodeField, self).__init__(r'^\d{5}$',
- max_length=None, min_length=None, *args, **kwargs)
- class DEStateSelect(Select):
- """
- A Select widget that uses a list of DE states as its choices.
- """
- def __init__(self, attrs=None):
- from de_states import STATE_CHOICES
- super(DEStateSelect, self).__init__(attrs, choices=STATE_CHOICES)
- class DEIdentityCardNumberField(Field):
- """
- 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 http://de.wikipedia.org/wiki/Personalausweis
- """
- 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
- fragment = ""
- parameter = 7
- for i in range(len(given_number)):
- fragment = str(int(given_number[i]) * 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
- def clean(self, value):
- super(DEIdentityCardNumberField, self).clean(value)
- if value in EMPTY_VALUES:
- return u''
- match = re.match(id_re, value)
- if not match:
- raise ValidationError(self.error_messages['invalid'])
- gd = match.groupdict()
- residence, origin = gd['residence'], gd['origin']
- birthday, validity, checksum = gd['birthday'], gd['validity'], gd['checksum']
- if residence == '0000000000' or birthday == '0000000' or validity == '0000000':
- raise ValidationError(self.error_messages['invalid'])
- all_digits = u"%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'])
- return u'%s%s-%s-%s-%s' % (residence, origin, birthday, validity, checksum)