diff options
Diffstat (limited to 'django/contrib/localflavor/it/util.py')
-rw-r--r-- | django/contrib/localflavor/it/util.py | 40 |
1 files changed, 40 insertions, 0 deletions
diff --git a/django/contrib/localflavor/it/util.py b/django/contrib/localflavor/it/util.py new file mode 100644 index 0000000000..49b607f160 --- /dev/null +++ b/django/contrib/localflavor/it/util.py @@ -0,0 +1,40 @@ +def ssn_check_digit(value): + "Calculate Italian social security number check digit." + ssn_even_chars = { + '0': 0, '1': 1, '2': 2, '3': 3, '4': 4, '5': 5, '6': 6, '7': 7, '8': 8, '9': 9, + 'A': 0, 'B': 1, 'C': 2, 'D': 3, 'E': 4, 'F': 5, 'G': 6, 'H': 7, 'I': 8, 'J': 9, + 'K': 10, 'L': 11, 'M': 12, 'N': 13, 'O': 14, 'P': 15, 'Q': 16, 'R': 17, 'S': 18, + 'T': 19, 'U': 20, 'V': 21, 'W': 22, 'X': 23, 'Y': 24, 'Z': 25 + } + ssn_odd_chars = { + '0': 1, '1': 0, '2': 5, '3': 7, '4': 9, '5': 13, '6': 15, '7': 17, '8': 19, '9': 21, + 'A': 1, 'B': 0, 'C': 5, 'D': 7, 'E': 9, 'F': 13, 'G': 15, 'H': 17, 'I': 19, 'J': 21, + 'K': 2, 'L': 4, 'M': 18, 'N': 20, 'O': 11, 'P': 3, 'Q': 6, 'R': 8, 'S': 12, + 'T': 14, 'U': 16, 'V': 10, 'W': 22, 'X': 25, 'Y': 24, 'Z': 23 + } + # Chars from 'A' to 'Z' + ssn_check_digits = [chr(x) for x in range(65, 91)] + + ssn = value.upper() + total = 0 + for i in range(0,15): + try: + if i % 2 == 0: + total += ssn_odd_chars[ssn[i]] + else: + total += ssn_even_chars[ssn[i]] + except KeyError: + msg = "Character '%(char)s' is not allowed." % {'char': ssn[i]} + raise ValueError(msg) + return ssn_check_digits[total % 26] + +def vat_number_check_digit(vat_number): + "Calculate Italian VAT number check digit." + normalized_vat_number = str(vat_number).zfill(10) + total = 0 + for i in range(0, 10, 2): + total += int(normalized_vat_number[i]) + for i in range(1, 11, 2): + quotient , remainder = divmod(int(normalized_vat_number[i]) * 2, 10) + total += quotient + remainder + return str((10 - total % 10) % 10) |