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Fixed #3919 -- Added German identity card number validation to German

localflavor. Thanks, Jannis Leidel.


git-svn-id: http://code.djangoproject.com/svn/django/trunk@4922 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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commit 5f2c513f9cfb7c4e20f3c970c602649e64de541d 1 parent 33a3220
@malcolmt malcolmt authored
View
64 django/contrib/localflavor/de/forms.py
@@ -7,6 +7,8 @@
from django.utils.translation import gettext
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})$")
+
class DEZipCodeField(RegexField):
def __init__(self, *args, **kwargs):
super(DEZipCodeField, self).__init__(r'^\d{5}$',
@@ -21,3 +23,65 @@ class DEStateSelect(Select):
def __init__(self, attrs=None):
from de_states import STATE_CHOICES # relative import
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
+ """
+ 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
+
+ if str(calculated_checksum)[-1] == given_checksum:
+ return True
+ return False
+
+ def clean(self, value):
+ super(DEIdentityCardNumberField, self).clean(value)
+ error_msg = gettext(u'Enter a valid German identity card number in XXXXXXXXXXX-XXXXXXX-XXXXXXX-X format')
+ if value in EMPTY_VALUES:
+ return u''
+ match = re.match(id_re, value)
+ if not match:
+ raise ValidationError(error_msg)
+
+ residence, origin, birthday, validity, checksum = \
+ match.groupdict()['residence'], match.groupdict()['origin'], \
+ match.groupdict()['birthday'], match.groupdict()['validity'], \
+ match.groupdict()['checksum']
+
+ if residence == '0000000000' or \
+ birthday == '0000000' or \
+ validity == '0000000':
+ raise ValidationError(error_msg)
+
+ 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(error_msg)
+
+ return u'%s%s-%s-%s-%s' % (residence, origin, birthday, validity, checksum)
View
13 tests/regressiontests/forms/localflavor.py
@@ -869,4 +869,17 @@
>>> w = DEStateSelect()
>>> w.render('states', 'TH')
u'<select name="states">\n<option value="BW">Baden-W\xfcrttemberg</option>\n<option value="BY">Bavaria</option>\n<option value="BE">Berlin</option>\n<option value="BB">Brandenburg</option>\n<option value="HB">Bremen</option>\n<option value="HH">Hamburg</option>\n<option value="HE">Hessen</option>\n<option value="MV">Mecklenburg-Western Pomerania</option>\n<option value="NI">Lower Saxony</option>\n<option value="NW">North Rhine-Westphalia</option>\n<option value="RP">Rhineland-Palatinate</option>\n<option value="SL">Saarland</option>\n<option value="SN">Saxony</option>\n<option value="ST">Saxony-Anhalt</option>\n<option value="SH">Schleswig-Holstein</option>\n<option value="TH" selected="selected">Thuringia</option>\n</select>'
+
+# DEIdentityCardNumberField #################################################
+
+>>> from django.contrib.localflavor.de.forms import DEIdentityCardNumberField
+>>> f = DEIdentityCardNumberField()
+>>> f.clean('7549313035D-6004103-0903042-0')
+u'7549313035D-6004103-0903042-0'
+>>> f.clean('9786324830D 6104243 0910271 2')
+u'9786324830D-6104243-0910271-2'
+>>> f.clean('0434657485D-6407276-0508137-9')
+Traceback (most recent call last):
+...
+ValidationError: [u'Enter a valid German identity card number in XXXXXXXXXXX-XXXXXXX-XXXXXXX-X format']
"""

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