From 71d9837302612de4b53c64e91a5c2a2b56192f30 Mon Sep 17 00:00:00 2001
From: Arthur de Jong <arthur@arthurdejong.org>
Date: Thu, 6 Feb 2014 21:05:23 +0100
Subject: Rename AT-02 module to stdnum.eu.at_02

---
 stdnum/eu/at_02.py | 76 ++++++++++++++++++++++++++++++++++++++++++++++++++++++
 1 file changed, 76 insertions(+)
 create mode 100644 stdnum/eu/at_02.py

(limited to 'stdnum/eu/at_02.py')

diff --git a/stdnum/eu/at_02.py b/stdnum/eu/at_02.py
new file mode 100644
index 0000000..dc1fa18
--- /dev/null
+++ b/stdnum/eu/at_02.py
@@ -0,0 +1,76 @@
+# at_02.py - functions for handling AT-02 (SEPA Creditor identifier)
+#
+# Copyright (C) 2014 Sergi Almacellas Abellana
+#
+# 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
+
+""" SEPA Identifier of the Creditor (AT-02)
+
+This identifier is indicated in the ISO 20022 data element `Creditor Scheme
+Identification`. The creditor can be a legal entity, or an association that
+is not a legal entity, or a person.
+Ther first two digits contain the ISO country code, the nex two are check
+digitsi for the ISO 7064 Mod 97, 10 checksum, the next tree contain the
+Creditor Bussines Code (or `ZZZ` if no bussness code used) and the remainder
+contain the country-specific identifier.
+
+>>> validate('ES23ZZZ47690558N')
+'ES23ZZZ47690558N'
+>>> validate('ES2300047690558N')
+'ES2300047690558N'
+>>> compact('ES++()+23ZZZ4//7690558N')
+'ES23ZZZ47690558N'
+"""
+
+from stdnum.exceptions import *
+from stdnum.iso7064 import mod_97_10
+from stdnum.util import clean
+
+# the valid characters we have
+_alphabet = '0123456789ABCDEFGHIJKLMNOPQRSTUVWXYZ'
+
+
+def compact(number):
+    """Convert the AT-02 number to the minimal representation. This strips the
+    number of any valid separators and removes invalid characters."""
+    return clean(number, ' -/?:().m\'+"').strip().upper()
+
+
+def _to_base10(number):
+    """Prepare the number to it's base10 representation so it can be checked
+    with the ISO 7064 Mod 97, 10 algorithm. That means excluding positions
+    5 to 7 and moving the first four digits to the end"""
+    return ''.join(str(_alphabet.index(x)) for x in number[7:] + number[:4])
+
+
+def validate(number):
+    """Checks to see if the number provided is a valid AT-02."""
+    number = compact(number)
+    try:
+        test_number = _to_base10(number)
+    except:
+        raise InvalidFormat()
+    # ensure that checksum is valid
+    mod_97_10.validate(test_number)
+    return number
+
+
+def is_valid(number):
+    """Checks to see if the number provided is a valid AT-02."""
+    try:
+        return bool(validate(number))
+    except ValidationError:
+        return False
-- 
cgit v1.2.3