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"""
Norwegian-specific Form helpers
"""
import re, datetime
from django.forms import ValidationError
from django.forms.fields import Field, RegexField, Select, EMPTY_VALUES
from django.utils.translation import ugettext_lazy as _
class NOZipCodeField(RegexField):
default_error_messages = {
'invalid': _('Enter a zip code in the format XXXX.'),
}
def __init__(self, *args, **kwargs):
super(NOZipCodeField, self).__init__(r'^\d{4}$',
max_length=None, min_length=None, *args, **kwargs)
class NOMunicipalitySelect(Select):
"""
A Select widget that uses a list of Norwegian municipalities (fylker)
as its choices.
"""
def __init__(self, attrs=None):
from no_municipalities import MUNICIPALITY_CHOICES
super(NOMunicipalitySelect, self).__init__(attrs, choices=MUNICIPALITY_CHOICES)
class NOSocialSecurityNumber(Field):
"""
Algorithm is documented at http://no.wikipedia.org/wiki/Personnummer
"""
default_error_messages = {
'invalid': _(u'Enter a valid Norwegian social security number.'),
}
def clean(self, value):
super(NOSocialSecurityNumber, self).clean(value)
if value in EMPTY_VALUES:
return u''
if not re.match(r'^\d{11}$', value):
raise ValidationError(self.error_messages['invalid'])
day = int(value[:2])
month = int(value[2:4])
year2 = int(value[4:6])
inum = int(value[6:9])
self.birthday = None
try:
if 000 <= inum < 500:
self.birthday = datetime.date(1900+year2, month, day)
if 500 <= inum < 750 and year2 > 54:
self.birthday = datetime.date(1800+year2, month, day)
if 500 <= inum < 1000 and year2 < 40:
self.birthday = datetime.date(2000+year2, month, day)
if 900 <= inum < 1000 and year2 > 39:
self.birthday = datetime.date(1900+year2, month, day)
except ValueError:
raise ValidationError(self.error_messages['invalid'])
sexnum = int(value[8])
if sexnum % 2 == 0:
self.gender = 'F'
else:
self.gender = 'M'
digits = map(int, list(value))
weight_1 = [3, 7, 6, 1, 8, 9, 4, 5, 2, 1, 0]
weight_2 = [5, 4, 3, 2, 7, 6, 5, 4, 3, 2, 1]
def multiply_reduce(aval, bval):
return sum([(a * b) for (a, b) in zip(aval, bval)])
if multiply_reduce(digits, weight_1) % 11 != 0:
raise ValidationError(self.error_messages['invalid'])
if multiply_reduce(digits, weight_2) % 11 != 0:
raise ValidationError(self.error_messages['invalid'])
return value
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