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