94 lines
3.1 KiB
Python
94 lines
3.1 KiB
Python
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# ruc.py - functions for handling Ecuadorian fiscal numbers
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# coding: utf-8
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#
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# Copyright (C) 2014 Jonathan Finlay
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# Copyright (C) 2014-2015 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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"""RUC (Registro Único de Contribuyentes, Ecuadorian company tax number).
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The RUC is a tax identification number for legal entities. It has 13 digits
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where the third digit is a number denoting the type of entity.
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>>> validate('1792060346-001')
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'1792060346001'
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>>> validate('1763154690001') # 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('179206034601') # too short
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Traceback (most recent call last):
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...
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InvalidLength: ...
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"""
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from stdnum.ec import ci
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from stdnum.exceptions import *
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__all__ = ['compact', 'validate', 'is_valid']
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# use the same compact function as CI
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compact = ci.compact
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def _checksum(number, weights):
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"""Calculate a checksum over the number given the weights."""
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return sum(w * int(n) for w, n in zip(weights, number)) % 11
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def validate(number):
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"""Checks to see if the number provided is a valid RUC number. This
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checks the length, formatting, check digit and check sum."""
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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 number.isdigit():
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raise InvalidFormat()
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if number[:2] < '01' or number[:2] > '24':
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raise InvalidComponent() # invalid province code
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if number[2] < '6':
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# 0..5 = natural RUC: CI plus establishment number
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if number[-3:] == '000':
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raise InvalidComponent() # establishment number wrong
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ci.validate(number[:10])
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elif number[2] == '6':
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# 6 = public RUC
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if number[-4:] == '0000':
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raise InvalidComponent() # establishment number wrong
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if _checksum(number[:9], (3, 2, 7, 6, 5, 4, 3, 2, 1)) != 0:
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raise InvalidChecksum()
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elif number[2] == '9':
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# 9 = juridical RUC
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if number[-3:] == '000':
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raise InvalidComponent() # establishment number wrong
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if _checksum(number[:10], (4, 3, 2, 7, 6, 5, 4, 3, 2, 1)) != 0:
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raise InvalidChecksum()
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else:
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raise InvalidComponent() # third digit wrong
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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 RUC number. This
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checks the length, formatting 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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