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Shared/lib/python3.4/site-packages/stdnum/ro/cnp.py

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+# cnp.py - functions for handling Romanian CNP numbers
+# coding: utf-8
+#
+# Copyright (C) 2012, 2013 Arthur de Jong
+#
+# This library is free software; you can redistribute it and/or
+# modify it under the terms of the GNU Lesser General Public
+# License as published by the Free Software Foundation; either
+# version 2.1 of the License, or (at your option) any later version.
+#
+# This library is distributed in the hope that it will be useful,
+# but WITHOUT ANY WARRANTY; without even the implied warranty of
+# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the GNU
+# Lesser General Public License for more details.
+#
+# You should have received a copy of the GNU Lesser General Public
+# License along with this library; if not, write to the Free Software
+# Foundation, Inc., 51 Franklin Street, Fifth Floor, Boston, MA
+# 02110-1301 USA
+
+"""CNP (Cod Numeric Personal, Romanian Numerical Personal Code).
+
+The CNP is a 13 digit number that includes information on the person's
+gender, birth date and country zone.
+
+>>> validate('1630615123457')
+'1630615123457'
+>>> validate('8800101221144')  # invalid first digit
+Traceback (most recent call last):
+    ...
+InvalidFormat: ...
+>>> validate('1632215123457')  # invalid date
+Traceback (most recent call last):
+    ...
+InvalidComponent: ...
+>>> validate('1630615123458')  # invalid check digit
+Traceback (most recent call last):
+    ...
+InvalidChecksum: ...
+"""
+
+import datetime
+
+from stdnum.exceptions import *
+from stdnum.util import clean
+
+
+def compact(number):
+    """Convert the number to the minimal representation. This strips the
+    number of any valid separators and removes surrounding whitespace."""
+    return clean(number, ' -').upper().strip()
+
+
+def calc_check_digit(number):
+    """Calculate the check digit for personal codes. The number passed
+    should not have the check digit included."""
+    # note that this algorithm has not been confirmed by an independent source
+    weights = (2, 7, 9, 1, 4, 6, 3, 5, 8, 2, 7, 9)
+    check = sum(weights[i] * int(n) for i, n in enumerate(number)) % 11
+    return '1' if check == 10 else str(check)
+
+
+def get_birth_date(number):
+    """Split the date parts from the number and return the birth date."""
+    centuries = {
+        '1': 1900, '2': 1900, '3': 1800, '4': 1800, '5': 2000, '6': 2000,
+    }  # we assume 1900 for the others in order to try to construct a date
+    year = int(number[1:3]) + centuries.get(number[0], 1900)
+    month = int(number[3:5])
+    day = int(number[5:7])
+    try:
+        return datetime.date(year, month, day)
+    except ValueError:
+        raise InvalidComponent()
+
+
+def validate(number):
+    """Checks to see if the number provided is a valid VAT number. This checks
+    the length, formatting and check digit."""
+    number = compact(number)
+    # first digit should be a known one (9=foreigner)
+    if not number.isdigit() or number[0] not in '1234569':
+        raise InvalidFormat()
+    if len(number) != 13:
+        raise InvalidLength()
+    # check if birth date is valid
+    birth_date = get_birth_date(number)
+    # TODO: check that the birth date is not in the future
+    # number[7:9] is the county, we ignore it for now, just check last digit
+    if calc_check_digit(number[:-1]) != number[-1]:
+        raise InvalidChecksum()
+    return number
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid VAT number. This checks
+    the length, formatting and check digit."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False