Source code for localflavor.is_.forms
"""Iceland specific form helpers."""
from django.forms import ValidationError
from django.forms.fields import RegexField
from django.forms.widgets import Select
from django.utils.encoding import force_str
from django.utils.translation import gettext_lazy as _
from .is_postalcodes import IS_POSTALCODES
[docs]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': _('The Icelandic identification number is not valid.'),
}
def __init__(self, max_length=11, min_length=10, **kwargs):
super().__init__(
r'^\d{6}(-| )?\d{4}$', max_length=max_length, min_length=min_length,
**kwargs
)
[docs] def clean(self, value):
value = super().clean(value)
if value in self.empty_values:
return value
value = self._canonify(value)
if self._validate(value):
return self._format(value)
else:
raise ValidationError(self.error_messages['checksum'], code='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 force_str(value[:6] + '-' + value[6:])
[docs]class ISPostalCodeSelect(Select):
"""A Select widget that uses a list of Icelandic postal codes as its choices."""
def __init__(self, attrs=None):
super().__init__(attrs, choices=IS_POSTALCODES)