app/django/contrib/localflavor/us/forms.py
author Sverre Rabbelier <sverre@rabbelier.nl>
Mon, 25 May 2009 02:40:11 +0200
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"""
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USA-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.encoding import smart_unicode
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from django.utils.translation import ugettext_lazy as _
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import re
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phone_digits_re = re.compile(r'^(?:1-?)?(\d{3})[-\.]?(\d{3})[-\.]?(\d{4})$')
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ssn_re = re.compile(r"^(?P<area>\d{3})[-\ ]?(?P<group>\d{2})[-\ ]?(?P<serial>\d{4})$")
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class USZipCodeField(RegexField):
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    default_error_messages = {
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        'invalid': _('Enter a zip code in the format XXXXX or XXXXX-XXXX.'),
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    }
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    def __init__(self, *args, **kwargs):
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        super(USZipCodeField, self).__init__(r'^\d{5}(?:-\d{4})?$',
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            max_length=None, min_length=None, *args, **kwargs)
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class USPhoneNumberField(Field):
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    default_error_messages = {
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        'invalid': u'Phone numbers must be in XXX-XXX-XXXX format.',
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    }
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    def clean(self, value):
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        super(USPhoneNumberField, self).clean(value)
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        if value in EMPTY_VALUES:
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            return u''
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        value = re.sub('(\(|\)|\s+)', '', smart_unicode(value))
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        m = phone_digits_re.search(value)
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        if m:
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            return u'%s-%s-%s' % (m.group(1), m.group(2), m.group(3))
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        raise ValidationError(self.error_messages['invalid'])
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class USSocialSecurityNumberField(Field):
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    """
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    A United States Social Security number.
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    Checks the following rules to determine whether the number is valid:
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        * Conforms to the XXX-XX-XXXX format.
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        * No group consists entirely of zeroes.
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        * The leading group is not "666" (block "666" will never be allocated).
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        * The number is not in the promotional block 987-65-4320 through
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          987-65-4329, which are permanently invalid.
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        * The number is not one known to be invalid due to otherwise widespread
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          promotional use or distribution (e.g., the Woolworth's number or the
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          1962 promotional number).
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    """
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    default_error_messages = {
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        'invalid': _('Enter a valid U.S. Social Security number in XXX-XX-XXXX format.'),
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    }
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    def clean(self, value):
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        super(USSocialSecurityNumberField, 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(ssn_re, value)
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        if not match:
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            raise ValidationError(self.error_messages['invalid'])
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        area, group, serial = match.groupdict()['area'], match.groupdict()['group'], match.groupdict()['serial']
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        # First pass: no blocks of all zeroes.
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        if area == '000' or \
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           group == '00' or \
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           serial == '0000':
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            raise ValidationError(self.error_messages['invalid'])
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        # Second pass: promotional and otherwise permanently invalid numbers.
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        if area == '666' or \
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           (area == '987' and group == '65' and 4320 <= int(serial) <= 4329) or \
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           value == '078-05-1120' or \
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           value == '219-09-9999':
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            raise ValidationError(self.error_messages['invalid'])
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        return u'%s-%s-%s' % (area, group, serial)
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class USStateField(Field):
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    """
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    A form field that validates its input is a U.S. state name or abbreviation.
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    It normalizes the input to the standard two-leter postal service
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    abbreviation for the given state.
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    """
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    default_error_messages = {
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        'invalid': u'Enter a U.S. state or territory.',
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    }
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    def clean(self, value):
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        from us_states import STATES_NORMALIZED
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        super(USStateField, self).clean(value)
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        if value in EMPTY_VALUES:
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            return u''
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        try:
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            value = value.strip().lower()
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        except AttributeError:
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            pass
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        else:
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            try:
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                return STATES_NORMALIZED[value.strip().lower()].decode('ascii')
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            except KeyError:
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                pass
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        raise ValidationError(self.error_messages['invalid'])
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class USStateSelect(Select):
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    """
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    A Select widget that uses a list of U.S. states/territories as its choices.
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    """
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    def __init__(self, attrs=None):
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        from us_states import STATE_CHOICES
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        super(USStateSelect, self).__init__(attrs, choices=STATE_CHOICES)