"""
Swiss-specific Form helpers
"""
from django.core.validators import EMPTY_VALUES
from django.forms import ValidationError
from django.forms.fields import Field,RegexField,Select
from django.utils.encoding import smart_unicode
from django.utils.translation import ugettext_lazy
import re
id_re = re.compile(r"^(?P<idnumber>\w{8})(?P<pos9>(\d{1}|<))(?P<checksum>\d{1})$")
phone_digits_re = re.compile(r'^0([1-9]{1})\d{8}$')
class CHZipCodeField(RegexField):
default_error_messages = {
'invalid': _('Enter a zip code in the format XXXX.'),
}
def __init__(self, *args, **kwargs):
super(CHZipCodeField, self).__init__(r'^\d{4}$',
max_length=None, min_length=None, *args, **kwargs)
class CHPhoneNumberField(Field):
"""
Validate local Swiss phone number (not international ones)
The correct format is '0XX XXX XX XX'.
'0XX.XXX.XX.XX' and '0XXXXXXXXX' validate but are corrected to
'0XX XXX XX XX'.
"""
default_error_messages = {
'invalid': 'Phone numbers must be in 0XX XXX XX XX format.',
}
def clean(self, value):
super(CHPhoneNumberField, self).clean(value)
if value in EMPTY_VALUES:
return u''
value = re.sub('(\.|\s|/|-)', '', smart_unicode(value))
m = phone_digits_re.search(value)
if m:
return u'%s %s %s %s' % (value[0:3], value[3:6], value[6:8], value[8:10])
raise ValidationError(self.error_messages['invalid'])
class CHStateSelect(Select):
"""
A Select widget that uses a list of CH states as its choices.
"""
def __init__(self, attrs=None):
from ch_states import STATE_CHOICES# relative import
super(CHStateSelect,self).__init__(attrs,choices=STATE_CHOICES)
class CHIdentityCardNumberField(Field):
"""
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
Algorithm is documented at http://adi.kousz.ch/artikel/IDCHE.htm
"""
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
fragment = ""
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 i in range(len(new_number)):
fragment = int(new_number[i])*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
def clean(self, value):
super(CHIdentityCardNumberField, self).clean(value)
if value in EMPTY_VALUES:
return u''
match = re.match(id_re, value)
if not match:
raise ValidationError(self.error_messages['invalid'])
idnumber, pos9, checksum = match.groupdict()['idnumber'], match.groupdict()['pos9'], match.groupdict()['checksum']
if idnumber == '00000000' or \
idnumber == 'A0000000':
raise ValidationError(self.error_messages['invalid'])
all_digits = "%s%s%s" % (idnumber, pos9, checksum)
if not self.has_valid_checksum(all_digits):
raise ValidationError(self.error_messages['invalid'])
return u'%s%s%s' % (idnumber, pos9, checksum)
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