61 lines
1.9 KiB
Python
61 lines
1.9 KiB
Python
"""
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South Africa-specific Form helpers
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"""
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from django.core.validators import EMPTY_VALUES
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from django.forms import ValidationError
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from django.forms.fields import Field, RegexField
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from django.utils.checksums import luhn
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from django.utils.translation import gettext as _
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import re
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from datetime import date
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id_re = re.compile(r'^(?P<yy>\d\d)(?P<mm>\d\d)(?P<dd>\d\d)(?P<mid>\d{4})(?P<end>\d{3})')
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class ZAIDField(Field):
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"""A form field for South African ID numbers -- the checksum is validated
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using the Luhn checksum, and uses a simlistic (read: not entirely accurate)
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check for the birthdate
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"""
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default_error_messages = {
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'invalid': _(u'Enter a valid South African ID number'),
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}
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def clean(self, value):
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super(ZAIDField, self).clean(value)
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if value in EMPTY_VALUES:
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return u''
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# strip spaces and dashes
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value = value.strip().replace(' ', '').replace('-', '')
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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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g = match.groupdict()
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try:
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# The year 2000 is conveniently a leapyear.
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# This algorithm will break in xx00 years which aren't leap years
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# There is no way to guess the century of a ZA ID number
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d = date(int(g['yy']) + 2000, int(g['mm']), int(g['dd']))
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except ValueError:
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raise ValidationError(self.error_messages['invalid'])
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if not luhn(value):
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raise ValidationError(self.error_messages['invalid'])
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return value
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class ZAPostCodeField(RegexField):
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default_error_messages = {
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'invalid': _(u'Enter a valid South African postal code'),
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}
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def __init__(self, *args, **kwargs):
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super(ZAPostCodeField, self).__init__(r'^\d{4}$',
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max_length=None, min_length=None, *args, **kwargs)
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