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1 """ |
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2 DE-specific Form helpers |
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3 """ |
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4 |
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5 from django.forms import ValidationError |
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6 from django.forms.fields import Field, RegexField, Select, EMPTY_VALUES |
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7 from django.utils.translation import ugettext_lazy as _ |
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8 import re |
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9 |
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10 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})$") |
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11 |
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12 class DEZipCodeField(RegexField): |
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13 default_error_messages = { |
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14 'invalid': _('Enter a zip code in the format XXXXX.'), |
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15 } |
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16 def __init__(self, *args, **kwargs): |
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17 super(DEZipCodeField, self).__init__(r'^\d{5}$', |
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18 max_length=None, min_length=None, *args, **kwargs) |
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19 |
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20 class DEStateSelect(Select): |
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21 """ |
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22 A Select widget that uses a list of DE states as its choices. |
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23 """ |
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24 def __init__(self, attrs=None): |
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25 from de_states import STATE_CHOICES |
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26 super(DEStateSelect, self).__init__(attrs, choices=STATE_CHOICES) |
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27 |
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28 class DEIdentityCardNumberField(Field): |
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29 """ |
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30 A German identity card number. |
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31 |
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32 Checks the following rules to determine whether the number is valid: |
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33 |
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34 * Conforms to the XXXXXXXXXXX-XXXXXXX-XXXXXXX-X format. |
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35 * No group consists entirely of zeroes. |
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36 * Included checksums match calculated checksums |
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37 |
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38 Algorithm is documented at http://de.wikipedia.org/wiki/Personalausweis |
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39 """ |
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40 default_error_messages = { |
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41 'invalid': _('Enter a valid German identity card number in XXXXXXXXXXX-XXXXXXX-XXXXXXX-X format.'), |
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42 } |
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43 |
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44 def has_valid_checksum(self, number): |
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45 given_number, given_checksum = number[:-1], number[-1] |
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46 calculated_checksum = 0 |
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47 fragment = "" |
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48 parameter = 7 |
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49 |
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50 for i in range(len(given_number)): |
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51 fragment = str(int(given_number[i]) * parameter) |
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52 if fragment.isalnum(): |
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53 calculated_checksum += int(fragment[-1]) |
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54 if parameter == 1: |
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55 parameter = 7 |
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56 elif parameter == 3: |
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57 parameter = 1 |
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58 elif parameter ==7: |
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59 parameter = 3 |
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60 |
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61 return str(calculated_checksum)[-1] == given_checksum |
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62 |
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63 def clean(self, value): |
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64 super(DEIdentityCardNumberField, self).clean(value) |
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65 if value in EMPTY_VALUES: |
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66 return u'' |
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67 match = re.match(id_re, value) |
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68 if not match: |
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69 raise ValidationError(self.error_messages['invalid']) |
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70 |
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71 gd = match.groupdict() |
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72 residence, origin = gd['residence'], gd['origin'] |
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73 birthday, validity, checksum = gd['birthday'], gd['validity'], gd['checksum'] |
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74 |
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75 if residence == '0000000000' or birthday == '0000000' or validity == '0000000': |
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76 raise ValidationError(self.error_messages['invalid']) |
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77 |
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78 all_digits = u"%s%s%s%s" % (residence, birthday, validity, checksum) |
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79 if not self.has_valid_checksum(residence) or not self.has_valid_checksum(birthday) or \ |
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80 not self.has_valid_checksum(validity) or not self.has_valid_checksum(all_digits): |
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81 raise ValidationError(self.error_messages['invalid']) |
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82 |
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83 return u'%s%s-%s-%s-%s' % (residence, origin, birthday, validity, checksum) |