44 lines
1.1 KiB
Python
44 lines
1.1 KiB
Python
"""IBAN."""
|
|
|
|
# standard
|
|
import re
|
|
|
|
# local
|
|
from .utils import validator
|
|
|
|
|
|
def _char_value(char: str):
|
|
"""A=10, B=11, ..., Z=35."""
|
|
return char if char.isdigit() else str(10 + ord(char) - ord("A"))
|
|
|
|
|
|
def _mod_check(value: str):
|
|
"""Check if the value string passes the mod97-test."""
|
|
# move country code and check numbers to end
|
|
rearranged = value[4:] + value[:4]
|
|
return int("".join(_char_value(char) for char in rearranged)) % 97 == 1
|
|
|
|
|
|
@validator
|
|
def iban(value: str, /):
|
|
"""Return whether or not given value is a valid IBAN code.
|
|
|
|
Examples:
|
|
>>> iban('DE29100500001061045672')
|
|
True
|
|
>>> iban('123456')
|
|
ValidationError(func=iban, args={'value': '123456'})
|
|
|
|
Args:
|
|
value:
|
|
IBAN string to validate.
|
|
|
|
Returns:
|
|
(Literal[True]): If `value` is a valid IBAN code.
|
|
(ValidationError): If `value` is an invalid IBAN code.
|
|
"""
|
|
return (
|
|
(re.match(r"^[a-z]{2}[0-9]{2}[a-z0-9]{11,30}$", value, re.IGNORECASE) and _mod_check(value))
|
|
if value
|
|
else False
|
|
)
|