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"""
IT-specific Form helpers
"""
from django.forms import ValidationError
from django.forms.fields import Field, RegexField, Select, EMPTY_VALUES
from django.utils.translation import ugettext_lazy as _
from django.utils.encoding import smart_unicode
from django.contrib.localflavor.it.util import ssn_check_digit, vat_number_check_digit
import re
class ITZipCodeField(RegexField):
default_error_messages = {
'invalid': _('Enter a valid zip code.'),
}
def __init__(self, *args, **kwargs):
super(ITZipCodeField, self).__init__(r'^\d{5}$',
max_length=None, min_length=None, *args, **kwargs)
class ITRegionSelect(Select):
"""
A Select widget that uses a list of IT regions as its choices.
"""
def __init__(self, attrs=None):
from it_region import REGION_CHOICES
super(ITRegionSelect, self).__init__(attrs, choices=REGION_CHOICES)
class ITProvinceSelect(Select):
"""
A Select widget that uses a list of IT provinces as its choices.
"""
def __init__(self, attrs=None):
from it_province import PROVINCE_CHOICES
super(ITProvinceSelect, self).__init__(attrs, choices=PROVINCE_CHOICES)
class ITSocialSecurityNumberField(RegexField):
"""
A form field that validates Italian Social Security numbers (codice fiscale).
For reference see http://www.agenziaentrate.it/ and search for
'Informazioni sulla codificazione delle persone fisiche'.
"""
default_error_messages = {
'invalid': _(u'Enter a valid Social Security number.'),
}
def __init__(self, *args, **kwargs):
super(ITSocialSecurityNumberField, self).__init__(r'^\w{3}\s*\w{3}\s*\w{5}\s*\w{5}$',
max_length=None, min_length=None, *args, **kwargs)
def clean(self, value):
value = super(ITSocialSecurityNumberField, self).clean(value)
if value == u'':
return value
value = re.sub('\s', u'', value).upper()
try:
check_digit = ssn_check_digit(value)
except ValueError:
raise ValidationError(self.error_messages['invalid'])
if not value[15] == check_digit:
raise ValidationError(self.error_messages['invalid'])
return value
class ITVatNumberField(Field):
"""
A form field that validates Italian VAT numbers (partita IVA).
"""
default_error_messages = {
'invalid': _(u'Enter a valid VAT number.'),
}
def clean(self, value):
value = super(ITVatNumberField, self).clean(value)
if value == u'':
return value
try:
vat_number = int(value)
except ValueError:
raise ValidationError(self.error_messages['invalid'])
vat_number = str(vat_number).zfill(11)
check_digit = vat_number_check_digit(vat_number[0:10])
if not vat_number[10] == check_digit:
raise ValidationError(self.error_messages['invalid'])
return smart_unicode(vat_number)
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