117 lines
3.8 KiB
Python
117 lines
3.8 KiB
Python
# rc.py - functions for handling Czech birth numbers
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# coding: utf-8
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#
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# Copyright (C) 2012, 2013 Arthur de Jong
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#
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# This library is free software; you can redistribute it and/or
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# modify it under the terms of the GNU Lesser General Public
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# License as published by the Free Software Foundation; either
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# version 2.1 of the License, or (at your option) any later version.
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#
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# This library is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the GNU
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# Lesser General Public License for more details.
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#
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# You should have received a copy of the GNU Lesser General Public
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# License along with this library; if not, write to the Free Software
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# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
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# 02110-1301 USA
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"""RČ (Rodné číslo, the Czech birth number).
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The birth number (RČ, Rodné číslo) is the Czech national identifier. The
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number can be 9 or 10 digits long. Numbers given out after January 1st
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1954 should have 10 digits. The number includes the birth date of the
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person and their gender.
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This number is identical to the Slovak counterpart.
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>>> validate('710319/2745')
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'7103192745'
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>>> validate('991231123')
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'991231123'
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>>> validate('7103192746') # invalid check digit
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('1103492745') # invalid date
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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>>> validate('590312/123') # 9 digit number in 1959
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Traceback (most recent call last):
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...
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InvalidLength: ...
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>>> format('7103192745')
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'710319/2745'
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"""
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import datetime
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from stdnum.exceptions import *
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from stdnum.util import clean
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def compact(number):
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"""Convert the number to the minimal representation. This strips the
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number of any valid separators and removes surrounding whitespace."""
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return clean(number, ' /').upper().strip()
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def get_birth_date(number):
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"""Split the date parts from the number and return the birth date."""
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year = 1900 + int(number[0:2])
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# females have 50 added to the month value, 20 is added when the serial
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# overflows (since 2004)
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month = int(number[2:4]) % 50 % 20
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day = int(number[4:6])
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# 9 digit numbers were used until January 1st 1954
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if len(number) == 9:
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if year >= 1980:
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year -= 100
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if year > 1953:
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raise InvalidLength('No 9 digit birth numbers after 1953.')
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elif year < 1954:
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year += 100
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try:
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return datetime.date(year, month, day)
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except ValueError:
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raise InvalidComponent()
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def validate(number):
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"""Checks to see if the number provided is a valid birth number. This
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checks the length, formatting, embedded date and check digit."""
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number = compact(number)
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if not number.isdigit():
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raise InvalidFormat()
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if len(number) not in (9, 10):
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raise InvalidLength()
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# check if birth date is valid
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birth_date = get_birth_date(number)
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# TODO: check that the birth date is not in the future
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# check the check digit (10 digit numbers only)
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if len(number) == 10:
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check = int(number[:-1]) % 11
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# before 1985 the checksum could be 0 or 10
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if birth_date < datetime.date(1985, 1, 1):
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check = check % 10
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if number[-1] != str(check):
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raise InvalidChecksum()
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return number
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def is_valid(number):
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"""Checks to see if the number provided is a valid birth number. This
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checks the length, formatting, embedded date and check digit."""
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try:
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return bool(validate(number))
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except ValidationError:
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return False
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def format(number):
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"""Reformat the passed number to the standard format."""
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number = compact(number)
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return number[:6] + '/' + number[6:]
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