pyVat/pyVat/validators/it.py

# Copyright 2018 Agile Geeks

# Permission is hereby granted, free of charge, to any person obtaining a copy of this software
# and associated documentation files (the "Software"), to deal in the Software without restriction,
# including without limitation the rights to use, copy, modify, merge, publish, distribute,
# sublicense, and/or sell copies of the Software, and to permit persons to whom the Software
# is furnished to do so, subject to the following conditions:

# The above copyright notice and this permission notice shall be included in all copies or substantial
# portions of the Software.

# THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT
# LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
# IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY,
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# OR THE USE OR OTHER DEALINGS IN THE SOFTWARE.

from __future__ import (
    unicode_literals,
    print_function,
    division
)
import re
from .generic import GenericValidator


class Validator(GenericValidator):
    """
    For rules see /docs/VIES-VAT Validation Routines-v15.0.doc
    """

    def __init__(self):
        self.regexp = re.compile(r'^\d{11}$')

    def validate(self, vat_number):
        if super(Validator, self).validate(vat_number) is False:
            return False

        vat_number = str(vat_number)
        checksum = int(vat_number[10])

        c8910 = int(vat_number[7:10])
        if c8910 not in range(1, 102) and c8910 not in [120, 121, 999, 888]:
            return False

        s1 = 0
        for i in range(0,9,2):
            s1 = s1 + int(vat_number[i])

        s2 = 0
        for i in range(1,10,2):
            n = int(vat_number[i])
            s2 = s2 + int(n/5) + (2 * n) % 10

        checkval = (10 - (s1 + s2) % 10) % 10

        return checksum == checkval