1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
|
# aadhaar.py - functions for handling Indian Aadhaar numbers
#
# Copyright (C) 2017 Srikanth L
#
# 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
"""Aadhaar (Indian digital resident personal identity number)
Aadhaar is a 12 digit unique identity number issued to all Indian residents.
The number is assigned by the Unique Identification Authority of India
(UIDAI).
More information:
* https://en.wikipedia.org/wiki/Aadhaar
>>> validate('234123412346')
'234123412346'
>>> validate('234123412347')
Traceback (most recent call last):
...
InvalidChecksum: ...
>>> validate('123412341234') # number should not start with 0 or 1
Traceback (most recent call last):
...
InvalidFormat: ...
>>> validate('643343121')
Traceback (most recent call last):
...
InvalidLength: ...
>>> format('234123412346')
'2341 2341 2346'
>>> mask('234123412346')
'XXXX XXXX 2346'
"""
import re
from stdnum import verhoeff
from stdnum.exceptions import *
from stdnum.util import clean
aadhaar_re = re.compile(r'^[2-9][0-9]{11}$')
"""Regular expression used to check syntax of Aadhaar numbers."""
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, ' -').strip()
def validate(number):
"""Check if the number provided is a valid Aadhaar number. This checks
the length, formatting and check digit."""
number = compact(number)
if len(number) != 12:
raise InvalidLength()
if not aadhaar_re.match(number):
raise InvalidFormat()
verhoeff.validate(number)
return number
def is_valid(number):
"""Check if the number provided is a valid Aadhaar number. This checks
the length, formatting and check digit."""
try:
return bool(validate(number))
except ValidationError:
return False
def format(number):
"""Reformat the number to the standard presentation format."""
number = compact(number)
return ' '.join((number[:4], number[4:8], number[8:]))
def mask(number):
"""Masks the first 8 digits as per MeitY guidelines for securing identity
information and Sensitive personal data."""
number = compact(number)
return 'XXXX XXXX ' + number[-4:]
|