+
−"""
+
−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
+
−