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87 lines
1.7 KiB
87 lines
1.7 KiB
<?php
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namespace App\Helper;
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class TransactionCodeHelper
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{
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private const VALID_CHARS = [
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'2',
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'3',
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'4',
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'5',
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'6',
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'7',
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'8',
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'9',
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'A',
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'B',
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'C',
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'D',
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'E',
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'F',
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'G',
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'H',
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'J',
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'K',
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'L',
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'M',
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'N',
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'P',
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'Q',
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'R',
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'S',
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'T',
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'U',
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'V',
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'W',
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'X',
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'Y',
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'Z',
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];
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private const FACTOR = 2;
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/**
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* Validate the transaction code
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*
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* @param $key string
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* @return bool
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*/
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public static function verifyKey(string $key): bool
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{
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if (strlen($key) !== 10) {
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return false;
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}
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$checkDigit = self::generateCheckCharacter(strtoupper(substr($key, 0, 9)));
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return $key[9] === $checkDigit;
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}
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/**
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* generate the check character that should correspond to the last letter of the string
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*
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* @param $input
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* @return string
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*/
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public static function generateCheckCharacter(string $input): string
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{
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$factor = self::FACTOR;
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$sum = 0;
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$n = count(self::VALID_CHARS);
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for ($i = strlen($input) - 1; $i >= 0; $i--) {
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$code_point = array_search($input[$i], self::VALID_CHARS, true);
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$addend = $factor * $code_point;
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$factor = ($factor === 2) ? 1 : 2;
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$addend = ($addend / $n) + ($addend % $n);
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$sum += $addend;
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}
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$remainer = ($sum % $n);
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$checkCodePoint = ($n - $remainer) % $n;
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return self::VALID_CHARS[$checkCodePoint];
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}
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}
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