<?php
/**
* This file is part of CodeIgniter 4 framework.
*
* (c) CodeIgniter Foundation <admin@codeigniter.com>
*
* For the full copyright and license information, please view
* the LICENSE file that was distributed with this source code.
*/
namespace CodeIgniter\Validation;
/**
* Class CreditCardRules
*
* Provides validation methods for common credit-card inputs.
*
* @see http://en.wikipedia.org/wiki/Credit_card_number
*/
class CreditCardRules
{
/**
* The cards that we support, with the defining details:
*
* name - The type of card as found in the form. Must match the user's value
* length - List of possible lengths for the card number
* prefixes - List of possible prefixes for the card
* checkdigit - Boolean on whether we should do a modulus10 check on the numbers.
*
* @var array
*/
protected $cards = [
'American Express' => [
'name' => 'amex',
'length' => '15',
'prefixes' => '34,37',
'checkdigit' => true,
],
'China UnionPay' => [
'name' => 'unionpay',
'length' => '16,17,18,19',
'prefixes' => '62',
'checkdigit' => true,
],
'Dankort' => [
'name' => 'dankort',
'length' => '16',
'prefixes' => '5019,4175,4571,4',
'checkdigit' => true,
],
'DinersClub' => [
'name' => 'dinersclub',
'length' => '14,16',
'prefixes' => '300,301,302,303,304,305,309,36,38,39,54,55',
'checkdigit' => true,
],
'DinersClub CarteBlanche' => [
'name' => 'carteblanche',
'length' => '14',
'prefixes' => '300,301,302,303,304,305',
'checkdigit' => true,
],
'Discover Card' => [
'name' => 'discover',
'length' => '16,19',
'prefixes' => '6011,622,644,645,656,647,648,649,65',
'checkdigit' => true,
],
'InterPayment' => [
'name' => 'interpayment',
'length' => '16,17,18,19',
'prefixes' => '4',
'checkdigit' => true,
],
'JCB' => [
'name' => 'jcb',
'length' => '16,17,18,19',
'prefixes' => '352,353,354,355,356,357,358',
'checkdigit' => true,
],
'Maestro' => [
'name' => 'maestro',
'length' => '12,13,14,15,16,18,19',
'prefixes' => '50,56,57,58,59,60,61,62,63,64,65,66,67,68,69',
'checkdigit' => true,
],
'MasterCard' => [
'name' => 'mastercard',
'length' => '16',
'prefixes' => '51,52,53,54,55,22,23,24,25,26,27',
'checkdigit' => true,
],
'NSPK MIR' => [
'name' => 'mir',
'length' => '16',
'prefixes' => '2200,2201,2202,2203,2204',
'checkdigit' => true,
],
'Troy' => [
'name' => 'troy',
'length' => '16',
'prefixes' => '979200,979289',
'checkdigit' => true,
],
'UATP' => [
'name' => 'uatp',
'length' => '15',
'prefixes' => '1',
'checkdigit' => true,
],
'Verve' => [
'name' => 'verve',
'length' => '16,19',
'prefixes' => '506,650',
'checkdigit' => true,
],
'Visa' => [
'name' => 'visa',
'length' => '13,16,19',
'prefixes' => '4',
'checkdigit' => true,
],
// Canadian Cards
'BMO ABM Card' => [
'name' => 'bmoabm',
'length' => '16',
'prefixes' => '500',
'checkdigit' => false,
],
'CIBC Convenience Card' => [
'name' => 'cibc',
'length' => '16',
'prefixes' => '4506',
'checkdigit' => false,
],
'HSBC Canada Card' => [
'name' => 'hsbc',
'length' => '16',
'prefixes' => '56',
'checkdigit' => false,
],
'Royal Bank of Canada Client Card' => [
'name' => 'rbc',
'length' => '16',
'prefixes' => '45',
'checkdigit' => false,
],
'Scotiabank Scotia Card' => [
'name' => 'scotia',
'length' => '16',
'prefixes' => '4536',
'checkdigit' => false,
],
'TD Canada Trust Access Card' => [
'name' => 'tdtrust',
'length' => '16',
'prefixes' => '589297',
'checkdigit' => false,
],
];
/**
* Verifies that a credit card number is valid and matches the known
* formats for a wide number of credit card types. This does not verify
* that the card is a valid card, only that the number is formatted correctly.
*
* Example:
* $rules = [
* 'cc_num' => 'valid_cc_number[visa]'
* ];
*/
public function valid_cc_number(?string $ccNumber, string $type): bool
{
$type = strtolower($type);
$info = null;
// Get our card info based on provided name.
foreach ($this->cards as $card) {
if ($card['name'] === $type) {
$info = $card;
break;
}
}
// If empty, it's not a card type we recognize, or invalid type.
if (empty($info)) {
return false;
}
// Make sure we have a valid length
if (strlen($ccNumber) === 0) {
return false;
}
// Remove any spaces and dashes
$ccNumber = str_replace([' ', '-'], '', $ccNumber);
// Non-numeric values cannot be a number...duh
if (! is_numeric($ccNumber)) {
return false;
}
// Make sure it's a valid length for this card
$lengths = explode(',', $info['length']);
if (! in_array((string) strlen($ccNumber), $lengths, true)) {
return false;
}
// Make sure it has a valid prefix
$prefixes = explode(',', $info['prefixes']);
$validPrefix = false;
foreach ($prefixes as $prefix) {
if (strpos($ccNumber, $prefix) === 0) {
$validPrefix = true;
break;
}
}
if ($validPrefix === false) {
return false;
}
// Still here? Then check the number against the Luhn algorithm, if required
// @see https://en.wikipedia.org/wiki/Luhn_algorithm
// @see https://gist.github.com/troelskn/1287893
if ($info['checkdigit'] === true) {
return $this->isValidLuhn($ccNumber);
}
return true;
}
/**
* Checks the given number to see if the number passing a Luhn check.
*
* @param string $number
*/
protected function isValidLuhn(?string $number = null): bool
{
$number = (string) $number;
$sumTable = [
[
0,
1,
2,
3,
4,
5,
6,
7,
8,
9,
],
[
0,
2,
4,
6,
8,
1,
3,
5,
7,
9,
],
];
$sum = 0;
$flip = 0;
for ($i = strlen($number) - 1; $i >= 0; $i--) {
$sum += $sumTable[$flip++ & 0x1][$number[$i]];
}
return $sum % 10 === 0;
}
}
MGatner