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"""
FI-specific Form helpers
"""
import re
from django.forms import ValidationError
from django.forms.fields import Field, RegexField, Select, EMPTY_VALUES
from django.utils.translation import ugettext_lazy as _
class FIZipCodeField(RegexField):
default_error_messages = {
'invalid': _('Enter a zip code in the format XXXXX.'),
}
def __init__(self, *args, **kwargs):
super(FIZipCodeField, self).__init__(r'^\d{5}$',
max_length=None, min_length=None, *args, **kwargs)
class FIMunicipalitySelect(Select):
"""
A Select widget that uses a list of Finnish municipalities as its choices.
"""
def __init__(self, attrs=None):
from fi_municipalities import MUNICIPALITY_CHOICES
super(FIMunicipalitySelect, self).__init__(attrs, choices=MUNICIPALITY_CHOICES)
class FISocialSecurityNumber(Field):
default_error_messages = {
'invalid': _('Enter a valid Finnish social security number.'),
}
def clean(self, value):
super(FISocialSecurityNumber, self).clean(value)
if value in EMPTY_VALUES:
return u''
checkmarks = "0123456789ABCDEFHJKLMNPRSTUVWXY"
result = re.match(r"""^
(?P<date>([0-2]\d|3[01])
(0\d|1[012])
(\d{2}))
[A+-]
(?P<serial>(\d{3}))
(?P<checksum>[%s])$""" % checkmarks, value, re.VERBOSE | re.IGNORECASE)
if not result:
raise ValidationError(self.error_messages['invalid'])
gd = result.groupdict()
checksum = int(gd['date'] + gd['serial'])
if checkmarks[checksum % len(checkmarks)] == gd['checksum'].upper():
return u'%s' % value.upper()
raise ValidationError(self.error_messages['invalid'])
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