Add a generic method for getting a Keyname
This patch will make logic/key_name.py obsolete in the future when
everything is compliant with base.logic.
This also makes the naming of already compliant logic modules generic
and also fixes the _name field to be consistent with the naming in
key_name.py.
Note: This does not use Group/Sponsor, Group/School,
Group/Organisation or Group/Club.
Patch by: "Lennard de Rijk" <rijk0214@gmail.com>
Reviewed by: Sverre Rabbelier
"""
Common checksum routines (used in multiple localflavor/ cases, for example).
"""
__all__ = ['luhn',]
LUHN_ODD_LOOKUP = (0, 2, 4, 6, 8, 1, 3, 5, 7, 9) # sum_of_digits(index * 2)
def luhn(candidate):
"""
Checks a candidate number for validity according to the Luhn
algorithm (used in validation of, for example, credit cards).
Both numeric and string candidates are accepted.
"""
if not isinstance(candidate, basestring):
candidate = str(candidate)
try:
evens = sum([int(c) for c in candidate[-1::-2]])
odds = sum([LUHN_ODD_LOOKUP[int(c)] for c in candidate[-2::-2]])
return ((evens + odds) % 10 == 0)
except ValueError: # Raised if an int conversion fails
return False