--- /dev/null Thu Jan 01 00:00:00 1970 +0000
+++ b/app/django/contrib/localflavor/de/forms.py Fri Jul 18 18:22:23 2008 +0000
@@ -0,0 +1,83 @@
+"""
+DE-specific Form helpers
+"""
+
+from django.newforms import ValidationError
+from django.newforms.fields import Field, RegexField, Select, EMPTY_VALUES
+from django.utils.translation import ugettext
+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})$")
+
+class DEZipCodeField(RegexField):
+ default_error_messages = {
+ 'invalid': ugettext('Enter a zip code in the format XXXXX.'),
+ }
+ def __init__(self, *args, **kwargs):
+ super(DEZipCodeField, self).__init__(r'^\d{5}$',
+ 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': ugettext('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)