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From: Pavel Reich <[email protected]>
Newsgroups: fido7.ru.cgi.perl
Subject: Вот проверка валидности номеров кредитных карт
MM> Hаpод, кто нибуть занимался созданием интеpнет магазина с
MM> online'овой валидацией кpедитных каpточек ? Если есть такие,
MM> подскажите пожалуйста, где можно поподpобнее почитать пpо создание
MM> такой штуки (на базе пеpловых скpиптов желательно), есть ли готовый
MM> софт для этого и как быть с этой самой валидацией кpедиток?
Вот проверка валидности (из CGI/Perl CookBook)
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############################################################################
# #
# cc_validate() Version 2.0 #
# Written by Craig Patchett [email protected] #
# Created 9/24/96 Last Modified 3/21/97 #
# #
# Copyright 1997 Craig Patchett & Matthew Wright. All Rights Reserved. #
# This subroutine is part of The CGI/Perl Cookbook from John Wiley & Sons. #
# License to use this program or install it on a server (in original or #
# modified form) is granted only to those who have purchased a copy of The #
# CGI/Perl Cookbook. (This notice must remain as part of the source code.) #
# #
# Function: Checks Visa, Mastercard, and American Express credit card #
# numbers to make sure they follow bank guidelines for #
# credit card numbers. #
# #
# Usage: &cc_validate($card_type, $card_num, $exp_date); #
# #
# Variables: $card_type -- Card type #
# Valid values: 'VS', 'MC', 'AX' #
# $card_num -- Card number. Non-numeric will be revoed #
# Example: '1234-5678-9012-3456' #
# $exp_date -- Expiration date #
# Examples: '05/99', '5/99' #
# #
# Returns: 0 if successful #
# 1 if invalid card type #
# 2 if invalid number of digits in card number #
# 3 if if card has expired or expiration date is invalid #
# 4 if card number is invalid #
# #
# Uses Globals: Sets $Error_Message with descriptive error message #
# #
# Files Created: None #
# #
############################################################################
sub cc_validate {
local($card_type, $card_num, $exp_date) = @_;
local(%card_length) = ('VS', '13,15,16', 'MC', '16', 'AX', '15');
local($old_card_num, $card_length, $total, $d);
# Check to make sure the card type is valid
$card_type =~ tr/a-z/A-Z/;
if (!$card_length{$card_type}) {
$Error_Message = "$card_type is not a valid card type.";
return(1);
}
# Get rid of non-digits in card number and check for right number
# of digits
$old_card_num = $card_num;
$card_num =~ s/\D//g;
$card_length = length($card_num);
if (!($card_length{$card_type} =~ /(^|,)$card_length(,|$)/)) {
$Error_Message = "Card number $old_card_num does not have the correct
number of digits.";
return(2);
}
# Check to see if the card has expired
local($month_now, $year_now) = (localtime)[4,5];
++$month_now;
if ($year_now < 50) { $year_now += 100 }
$exp_date =~ m|(\d+)/(\d+)|;
$exp_month = $1;
$exp_year = ($2 < 50) ? $2 + 100 : $2;
if ((($year_now == $exp_year) && ($month_now > $exp_month))
|| ($exp_year - $year_now < 0) || ($exp_year - $year_now > 10)) {
$Error_Message = "$exp_date is an invalid expiration date.";
return(3);
}
# Check to see if card number is valid (checks only to see if the card
# number sequence is a valid sequence.
while (length($card_num)) {
$total += chop($card_num);
$total += (($d = chop($card_num)) < 9) ? ($d * 2) % 9 : 9;
}
if ($total % 10) {
$Error_Message = "$old_card_num is not a valid credit card number.";
return(4);
}
# It passed all the tests!
return(0);
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Pavel
