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<?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 ((string) $ccNumber === '') { 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; } }