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import re
from .utils import validator
regex = (
r'^[A-Z]{2}[0-9]{2}[A-Z0-9]{11,30}$'
)
pattern = re.compile(regex)
def char_value(char):
"""A=10, B=11, ..., Z=35
"""
if char.isdigit():
return int(char)
else:
return 10 + ord(char) - ord('A')
def modcheck(value):
"""Check if the value string passes the mod97-test.
"""
# move country code and check numbers to end
rearranged = value[4:] + value[:4]
# convert letters to numbers
converted = [char_value(char) for char in rearranged]
# interpret as integer
integerized = int(''.join([str(i) for i in converted]))
return (integerized % 97 == 1)
@validator
def iban(value):
"""
Return whether or not given value is a valid IBAN code.
If the value is a valid IBAN this function returns ``True``, otherwise
:class:`~validators.utils.ValidationFailure`.
Examples::
>>> iban('DE29100500001061045672')
True
>>> iban('123456')
ValidationFailure(func=iban, ...)
.. versionadded:: 0.8
:param value: IBAN string to validate
"""
return pattern.match(value) and modcheck(value)
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