"""
Iceland specific form helpers.
"""
from django.core.validators import EMPTY_VALUES
from django.forms import ValidationError
from django.forms.fields import RegexField
from django.forms.widgets import Select
from django.utils.translation import ugettext_lazy
from django.utils.encoding import smart_unicode
class ISIdNumberField(RegexField):
"""
Icelandic identification number (kennitala). This is a number every citizen
of Iceland has.
"""
default_error_messages = {
'invalid': _('Enter a valid Icelandic identification number. The format is XXXXXX-XXXX.'),
'checksum': _(u'The Icelandic identification number is not valid.'),
}
def __init__(self, *args, **kwargs):
kwargs['min_length'],kwargs['max_length'] = 10,11
super(ISIdNumberField, self).__init__(r'^\d{6}(-| )?\d{4}$', *args, **kwargs)
def clean(self, value):
value = super(ISIdNumberField, self).clean(value)
if value in EMPTY_VALUES:
return u''
value = self._canonify(value)
if self._validate(value):
return self._format(value)
else:
raise ValidationError(self.error_messages['checksum'])
def _canonify(self, value):
"""
Returns the value as only digits.
"""
return value.replace('-', '').replace(' ', '')
def _validate(self, value):
"""
Takes in the value in canonical form and checks the verifier digit. The
method is modulo 11.
"""
check = [3, 2, 7, 6, 5, 4, 3, 2, 1, 0]
return sum([int(value[i]) * check[i] for i in range(10)]) % 11 == 0
def _format(self, value):
"""
Takes in the value in canonical form and returns it in the common
display format.
"""
return smart_unicode(value[:6]+'-'+value[6:])
class ISPhoneNumberField(RegexField):
"""
Icelandic phone number. Seven digits with an optional hyphen or space after
the first three digits.
"""
def __init__(self, *args, **kwargs):
kwargs['min_length'], kwargs['max_length'] = 7,8
super(ISPhoneNumberField, self).__init__(r'^\d{3}(-| )?\d{4}$', *args, **kwargs)
def clean(self, value):
value = super(ISPhoneNumberField, self).clean(value)
if value in EMPTY_VALUES:
return u''
return value.replace('-', '').replace(' ', '')
class ISPostalCodeSelect(Select):
"""
A Select widget that uses a list of Icelandic postal codes as its choices.
"""
def __init__(self, attrs=None):
from is_postalcodes import IS_POSTALCODES
super(ISPostalCodeSelect, self).__init__(attrs, choices=IS_POSTALCODES)
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