Source code for localflavor.ch.forms
"""Swiss-specific Form helpers."""
import re
from django.core.exceptions import ImproperlyConfigured
from django.core.validators import RegexValidator
from django.forms import ValidationError
from django.forms.fields import CharField, RegexField, Select
from django.utils.translation import gettext_lazy as _
from ..generic import validators
from .ch_states import STATE_CHOICES
zip_re = re.compile(r'^[1-9]\d{3}$')
id_re = re.compile(r'^(?P<idnumber>\w{8})(?P<pos9>(\d{1}|<))(?P<checksum>\d{1})$')
ssn_re = re.compile(r'^756.\d{4}\.\d{4}\.\d{2}$')
[docs]class CHZipCodeField(RegexField):
"""
A form field that validates input as a Swiss zip code.
Valid codes consist of four digits ranging from 1XXX to 9XXX.
See:
http://en.wikipedia.org/wiki/Postal_codes_in_Switzerland_and_Liechtenstein
"""
default_error_messages = {
'invalid': _('Enter a valid postal code in the range and format 1XXX - 9XXX.'),
}
def __init__(self, **kwargs):
super().__init__(zip_re, **kwargs)
[docs]class CHStateSelect(Select):
"""A Select widget that uses a list of CH states as its choices."""
def __init__(self, attrs=None):
super().__init__(attrs, choices=STATE_CHOICES)
[docs]class CHIdentityCardNumberField(CharField):
"""
A Swiss identity card number.
Checks the following rules to determine whether the number is valid:
* Conforms to the X1234567<0 or 1234567890 format.
* Included checksums match calculated checksums
"""
default_error_messages = {
'invalid': _('Enter a valid Swiss identity or passport card number in X1234567<0 or 1234567890 format.'),
}
def has_valid_checksum(self, number):
given_number, given_checksum = number[:-1], number[-1]
new_number = given_number
calculated_checksum = 0
parameter = 7
first = str(number[:1])
if first.isalpha():
num = ord(first.upper()) - 65
if num < 0 or num > 8:
return False
new_number = str(num) + new_number[1:]
new_number = new_number[:8] + '0'
if not new_number.isdigit():
return False
for digit in new_number:
fragment = int(digit) * parameter
calculated_checksum += fragment
if parameter == 1:
parameter = 7
elif parameter == 3:
parameter = 1
elif parameter == 7:
parameter = 3
return str(calculated_checksum)[-1] == given_checksum
[docs] def clean(self, value):
value = super().clean(value)
if value in self.empty_values:
return value
match = re.match(id_re, value)
if not match:
raise ValidationError(self.error_messages['invalid'], code='invalid')
result = match.groupdict()
idnumber, pos9, checksum = result['idnumber'], result['pos9'], result['checksum']
if idnumber in ('00000000', 'A0000000'):
raise ValidationError(self.error_messages['invalid'], code='invalid')
all_digits = "%s%s%s" % (idnumber, pos9, checksum)
if not self.has_valid_checksum(all_digits):
raise ValidationError(self.error_messages['invalid'], code='invalid')
return '%s%s%s' % (idnumber, pos9, checksum)
[docs]class CHSocialSecurityNumberField(CharField):
"""
A Swiss Social Security number (also known as the new AHV Number).
Checks the following rules to determine whether the number is valid:
* Conforms to the 756.XXXX.XXXX.XX
* Included checksums match calculated checksums
See:
http://de.wikipedia.org/wiki/Sozialversicherungsnummer#Versichertennummer
.. versionadded:: 1.2
"""
default_error_messages = {
'invalid': _('Enter a valid Swiss Social Security number in 756.XXXX.XXXX.XX format.'),
}
default_validators = [
RegexValidator(regex=ssn_re),
validators.EANValidator(strip_nondigits=True),
]
def run_validators(self, value):
try:
super().run_validators(value)
except ValidationError as errs:
# Deduplicate error messages, if any
raise ValidationError(list(set(errs.messages)), code='invalid')