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""" |
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DE-specific Form helpers |
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""" |
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from django.forms import ValidationError |
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from django.forms.fields import Field, RegexField, Select, EMPTY_VALUES |
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from django.utils.translation import ugettext_lazy as _ |
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import re |
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|
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id_re = re.compile(r"^(?P<residence>\d{10})(?P<origin>\w{1,3})[-\ ]?(?P<birthday>\d{7})[-\ ]?(?P<validity>\d{7})[-\ ]?(?P<checksum>\d{1})$") |
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|
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class DEZipCodeField(RegexField): |
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default_error_messages = { |
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'invalid': _('Enter a zip code in the format XXXXX.'), |
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} |
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def __init__(self, *args, **kwargs): |
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super(DEZipCodeField, self).__init__(r'^\d{5}$', |
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max_length=None, min_length=None, *args, **kwargs) |
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|
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class DEStateSelect(Select): |
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""" |
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A Select widget that uses a list of DE states as its choices. |
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""" |
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def __init__(self, attrs=None): |
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from de_states import STATE_CHOICES |
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super(DEStateSelect, self).__init__(attrs, choices=STATE_CHOICES) |
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|
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class DEIdentityCardNumberField(Field): |
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""" |
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A German identity card number. |
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Checks the following rules to determine whether the number is valid: |
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* Conforms to the XXXXXXXXXXX-XXXXXXX-XXXXXXX-X format. |
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* No group consists entirely of zeroes. |
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* Included checksums match calculated checksums |
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|
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Algorithm is documented at http://de.wikipedia.org/wiki/Personalausweis |
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""" |
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default_error_messages = { |
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'invalid': _('Enter a valid German identity card number in XXXXXXXXXXX-XXXXXXX-XXXXXXX-X format.'), |
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} |
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|
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def has_valid_checksum(self, number): |
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given_number, given_checksum = number[:-1], number[-1] |
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calculated_checksum = 0 |
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fragment = "" |
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parameter = 7 |
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|
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for i in range(len(given_number)): |
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fragment = str(int(given_number[i]) * parameter) |
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if fragment.isalnum(): |
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calculated_checksum += int(fragment[-1]) |
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if parameter == 1: |
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parameter = 7 |
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elif parameter == 3: |
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parameter = 1 |
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elif parameter ==7: |
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parameter = 3 |
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|
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return str(calculated_checksum)[-1] == given_checksum |
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|
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def clean(self, value): |
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super(DEIdentityCardNumberField, self).clean(value) |
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if value in EMPTY_VALUES: |
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return u'' |
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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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|
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gd = match.groupdict() |
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residence, origin = gd['residence'], gd['origin'] |
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birthday, validity, checksum = gd['birthday'], gd['validity'], gd['checksum'] |
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|
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if residence == '0000000000' or birthday == '0000000' or validity == '0000000': |
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raise ValidationError(self.error_messages['invalid']) |
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|
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all_digits = u"%s%s%s%s" % (residence, birthday, validity, checksum) |
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if not self.has_valid_checksum(residence) or not self.has_valid_checksum(birthday) or \ |
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not self.has_valid_checksum(validity) or not self.has_valid_checksum(all_digits): |
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raise ValidationError(self.error_messages['invalid']) |
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|
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return u'%s%s-%s-%s-%s' % (residence, origin, birthday, validity, checksum) |
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