111 lines
4 KiB
Python
111 lines
4 KiB
Python
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# upn.py - functions for handling English UPNs
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#
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# Copyright (C) 2017 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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"""UPN (English Unique Pupil Number).
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The Unique Pupil Number (UPN) is a 13-character code that identifies pupils
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in English state schools and is designed to aid tracking pupil progress
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through the school system.
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The number consists of a check letter, a 3-digit LA (Local Authority) number
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for the issuing school, a 4-digit DfE number (School Establishment Number),
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2 digits for the issue year and 3 digits for a serial number. Temporary
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numbers have a 2-digit serial and a letter.
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More information:
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* https://www.gov.uk/government/publications/unique-pupil-numbers
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>>> validate('B801200005001')
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'B801200005001'
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>>> validate('A801200005001')
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Traceback (most recent call last):
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...
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InvalidChecksum: ...
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>>> validate('X80120000A001') # middle part must be numeric
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Traceback (most recent call last):
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...
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InvalidFormat: ...
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>>> validate('E000200005001') # LA number must be known
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Traceback (most recent call last):
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...
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InvalidComponent: ...
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"""
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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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# The allowed characters in an UPN.
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_alphabet = 'ABCDEFGHJKLMNPQRTUVWXYZ0123456789'
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# The known values for the LA (Local Authority) number.
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# https://www.gov.uk/government/statistics/new-local-authority-codes-january-2011
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_la_numbers = set((
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201, 202, 203, 204, 205, 206, 207, 208, 209, 210, 211, 212, 213, 301,
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302, 303, 304, 305, 306, 307, 308, 309, 310, 311, 312, 313, 314, 315,
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316, 317, 318, 319, 320, 330, 331, 332, 333, 334, 335, 336, 340, 341,
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342, 343, 344, 350, 351, 352, 353, 354, 355, 356, 357, 358, 359, 370,
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371, 372, 373, 380, 381, 382, 383, 384, 390, 391, 392, 393, 394, 420,
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800, 801, 802, 803, 805, 806, 807, 808, 810, 811, 812, 813, 815, 816,
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821, 822, 823, 825, 826, 830, 831, 835, 836, 837, 840, 841, 845, 846,
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850, 851, 852, 855, 856, 857, 860, 861, 865, 866, 867, 868, 869, 870,
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871, 872, 873, 874, 876, 877, 878, 879, 880, 881, 882, 883, 884, 885,
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886, 887, 888, 889, 890, 891, 892, 893, 894, 895, 896, 908, 909, 916,
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919, 921, 925, 926, 928, 929, 931, 933, 935, 936, 937, 938))
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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, ' ').upper().strip()
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def calc_check_digit(number: str) -> str:
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"""Calculate the check digit for the number."""
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check = sum(i * _alphabet.index(n)
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for i, n in enumerate(number[-12:], 2)) % 23
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return _alphabet[check]
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def validate(number: str) -> str:
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"""Check if the number is a valid UPN. This checks length, formatting and
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check digits."""
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number = compact(number)
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if len(number) != 13:
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raise InvalidLength()
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if not isdigits(number[1:-1]) or number[-1] not in _alphabet:
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raise InvalidFormat()
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if int(number[1:4]) not in _la_numbers:
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raise InvalidComponent()
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if calc_check_digit(number[1:]) != number[0]:
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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 UPN."""
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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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