105 lines
3.4 KiB
Python
105 lines
3.4 KiB
Python
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# bc_phn.py - functions for handling British Columbia Personal Health Numbers (PHNs)
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# coding: utf-8
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#
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# Copyright (C) 2023 Ömer Boratav
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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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"""BC PHN (British Columbia Personal Health Number).
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A unique, numerical, lifetime identifier used in the specific identification
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of an individual client or patient who has had any interaction with the
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British Columbia health system. It is assigned only to and used by one person
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and will not be assigned to any other person.
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The existence of a PHN does not imply eligibility for health care services in
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BC or provide any indication of an individual’s benefit status.
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The PNH is a 10-digit number where the first digit is always 9, and the last
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digit is a MOD-11 check digit.
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More information:
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* https://www2.gov.bc.ca/gov/content/health/health-drug-coverage/msp/bc-residents/personal-health-identification
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* https://www2.gov.bc.ca/assets/gov/health/practitioner-pro/software-development-guidelines/conformance-standards/vol-4b-app-rules-client-registry.pdf
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>>> validate('9698 658 215')
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'9698658215'
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>>> format('9698658215')
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'9698 658 215'
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>>> validate('9698648215')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('5736504210')
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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>>> validate('9736A04212')
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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""" # noqa: E501
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from __future__ import annotations
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from stdnum.exceptions import *
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from stdnum.util import clean, isdigits
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def compact(number: str) -> str:
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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, '- ').strip()
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def calc_check_digit(number: str) -> str:
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"""Calculate the check digit. The number passed should not have the check
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digit included."""
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weights = (2, 4, 8, 5, 10, 9, 7, 3)
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s = sum((w * int(n)) % 11 for w, n in zip(weights, number))
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return str((11 - s) % 11)
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def validate(number: str) -> str:
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"""Check if the number is a valid PHN. This checks the length,
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formatting and check digit."""
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number = compact(number)
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if len(number) != 10:
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raise InvalidLength()
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if not isdigits(number):
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raise InvalidFormat()
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if number[0] != '9':
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raise InvalidComponent()
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if number[9] != calc_check_digit(number[1:9]):
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raise InvalidChecksum()
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return number
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def is_valid(number: str) -> bool:
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"""Check if the number is a valid PHN."""
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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: str) -> str:
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"""Reformat the number to the standard presentation format."""
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number = compact(number)
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return ' '.join((number[0:4], number[4:7], number[7:]))
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