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Fixed #5475 -- Added the Luhn check algorithm to django.utils.checksu…
…ms so that localflavors don't have to reimplement it each time. Thanks, __hawkeye__. git-svn-id: http://code.djangoproject.com/svn/django/trunk@6569 bcc190cf-cafb-0310-a4f2-bffc1f526a37
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Original file line number | Original file line | Diff line number | Diff line change |
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@@ -0,0 +1,22 @@ | |||
""" | |||
Common checksum routines (used in multiple localflavor/ cases, for example). | |||
""" | |||
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__all__ = ['luhn',] | |||
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LUHN_ODD_LOOKUP = (0, 2, 4, 6, 8, 1, 3, 5, 7, 9) # sum_of_digits(index * 2) | |||
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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 |
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