def check_vat_nl(self, vat):
"""
Temporary Netherlands VAT validation to support the new format introduced in January 2020,
until upstream is fixed.
Algorithm detail: http://kleineondernemer.nl/index.php/nieuw-btw-identificatienummer-vanaf-1-januari-2020-voor-eenmanszaken
TODO: remove when fixed upstream
"""
try:
from stdnum.util import clean
from stdnum.nl.bsn import checksum
except ImportError:
return True
vat = clean(vat, ' -.').upper().strip()
# Remove the prefix
if vat.startswith("NL"):
vat = vat[2:]
if not len(vat) == 12:
return False
# Check the format
match = self.__check_vat_nl_re.match(vat)
if not match:
return False
# Match letters to integers
char_to_int = {k: str(ord(k) - 55) for k in string.ascii_uppercase}
char_to_int['+'] = '36'
char_to_int['*'] = '37'
# 2 possible checks:
# - For natural persons
# - For non-natural persons and combinations of natural persons (company)
# Natural person => mod97 full checksum
check_val_natural = '2321'
for x in vat:
check_val_natural += x if x.isdigit() else char_to_int[x]
if int(check_val_natural) % 97 == 1:
return True
# Company => weighted(9->2) mod11 on bsn
vat = vat[:-3]
if vat.isdigit() and checksum(vat) == 0:
return True
return False
def validate(number):
"""Check if the number is a valid onderwijsnummer. This checks the length
and whether the check digit is correct and whether it starts with the
right sequence."""
number = compact(number)
if not number.isdigit() or int(number) <= 0:
raise InvalidFormat()
if not number.startswith('10'):
raise InvalidFormat()
if len(number) != 9:
raise InvalidLength()
if checksum(number) != 5:
raise InvalidChecksum()
return number
def validate(number):
"""Check if the number is a valid onderwijsnummer. This checks the length
and whether the check digit is correct and whether it starts with the
right sequence."""
number = compact(number)
if not number.isdigit() or int(number) <= 0:
raise InvalidFormat()
if not number.startswith('10'):
raise InvalidFormat()
if len(number) != 9:
raise InvalidLength()
if checksum(number) != 5:
raise InvalidChecksum()
return number
