| """ |
| Kuwait-specific Form helpers |
| """ |
| import re |
| from datetime import date |
| |
| from django.core.validators import EMPTY_VALUES |
| from django.forms import ValidationError |
| from django.forms.fields import Field, RegexField |
| from django.utils.translation import gettext as _ |
| |
| id_re = re.compile(r'^(?P<initial>\d{1})(?P<yy>\d\d)(?P<mm>\d\d)(?P<dd>\d\d)(?P<mid>\d{4})(?P<checksum>\d{1})') |
| |
| class KWCivilIDNumberField(Field): |
| """ |
| Kuwaiti Civil ID numbers are 12 digits, second to seventh digits |
| represents the person's birthdate. |
| |
| Checks the following rules to determine the validty of the number: |
| * The number consist of 12 digits. |
| * The birthdate of the person is a valid date. |
| * The calculated checksum equals to the last digit of the Civil ID. |
| """ |
| default_error_messages = { |
| 'invalid': _('Enter a valid Kuwaiti Civil ID number'), |
| } |
| |
| def has_valid_checksum(self, value): |
| weight = (2, 1, 6, 3, 7, 9, 10, 5, 8, 4, 2) |
| calculated_checksum = 0 |
| for i in range(11): |
| calculated_checksum += int(value[i]) * weight[i] |
| |
| remainder = calculated_checksum % 11 |
| checkdigit = 11 - remainder |
| if checkdigit != int(value[11]): |
| return False |
| return True |
| |
| def clean(self, value): |
| super(KWCivilIDNumberField, self).clean(value) |
| if value in EMPTY_VALUES: |
| return u'' |
| |
| if not re.match(r'^\d{12}$', value): |
| raise ValidationError(self.error_messages['invalid']) |
| |
| match = re.match(id_re, value) |
| |
| if not match: |
| raise ValidationError(self.error_messages['invalid']) |
| |
| gd = match.groupdict() |
| |
| try: |
| d = date(int(gd['yy']), int(gd['mm']), int(gd['dd'])) |
| except ValueError: |
| raise ValidationError(self.error_messages['invalid']) |
| |
| if not self.has_valid_checksum(value): |
| raise ValidationError(self.error_messages['invalid']) |
| |
| return value |
