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# imei.py - functions for handling International Mobile Equipment Identity
# (IMEI) numbers
#
# Copyright (C) 2010, 2011, 2012 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
"""IMEI (International Mobile Equipment Identity).
The IMEI is used to identify mobile phones. The IMEI may optionally
include a check digit which is validated using the Luhn algorithm.
>>> is_valid('35686800-004141-20')
True
>>> is_valid('35-417803-685978-1') # incorrect check digit
False
>>> compact('35686800-004141-20')
'3568680000414120'
>>> format('354178036859789')
'35-417803-685978-9'
>>> format('35686800-004141', add_check_digit=True)
'35-686800-004141-8'
>>> imei_type('35686800-004141-20')
'IMEISV'
>>> split('35686800-004141')
('35686800', '004141', '')
"""
from stdnum.util import clean
def compact(number):
"""Convert the IMEI number to the minimal representation. This strips the
number of any valid separators and removes surrounding whitespace."""
return clean(number, ' -').strip().upper()
def imei_type(number):
"""Check the passed number and returns 'IMEI', 'IMEISV' or None (for
invalid) for checking the type of number passed."""
try:
number = compact(number)
except:
return None
if len(number) == 14: # IMEI without check digit
return 'IMEI' if number.isdigit() else None
if len(number) == 15: # IMEI with check digit
from stdnum import luhn
return 'IMEI' if luhn.is_valid(number) else None
elif len(number) == 16:
return 'IMEISV' if number.isdigit() else None
else:
return None
def is_valid(number):
"""Checks to see if the number provided is a valid IMEI (or IMEISV)
number."""
return imei_type(number) is not None
def split(number):
"""Split the number into a Type Allocation Code (TAC), serial number
and either the checksum (for IMEI) or the software version number (for
IMEISV)."""
number = compact(number)
return (number[:8], number[8:14], number[14:])
def format(number, separator='-', add_check_digit=False):
"""Reformat the passed number to the standard format."""
number = compact(number)
if len(number) == 14 and add_check_digit:
from stdnum import luhn
number += luhn.calc_check_digit(number)
number = (number[:2], number[2:8], number[8:14], number[14:])
return separator.join(x for x in number if x)
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