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<?php
/*
* This file is part of the Laravel Paystack package.
*
* (c) Prosper Otemuyiwa <prosperotemuyiwa@gmail.com>
*
* Source http://stackoverflow.com/a/13733588/179104
*
* For the full copyright and license information, please view the LICENSE
* file that was distributed with this source code.
*/
namespace Unicodeveloper\Paystack;
class TransRef
{
/**
* Get the pool to use based on the type of prefix hash
* @param string $type
* @return string
*/
private static function getPool($type = 'alnum')
{
switch ($type) {
case 'alnum':
$pool = '0123456789abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
break;
case 'alpha':
$pool = 'abcdefghijklmnopqrstuvwxyzABCDEFGHIJKLMNOPQRSTUVWXYZ';
break;
case 'hexdec':
$pool = '0123456789abcdef';
break;
case 'numeric':
$pool = '0123456789';
break;
case 'nozero':
$pool = '123456789';
break;
case 'distinct':
$pool = '2345679ACDEFHJKLMNPRSTUVWXYZ';
break;
default:
$pool = (string) $type;
break;
}
return $pool;
}
/**
* Generate a random secure crypt figure
* @param integer $min
* @param integer $max
* @return integer
*/
private static function secureCrypt($min, $max)
{
$range = $max - $min;
if ($range < 0) {
return $min; // not so random...
}
$log = log($range, 2);
$bytes = (int) ($log / 8) + 1; // length in bytes
$bits = (int) $log + 1; // length in bits
$filter = (int) (1 << $bits) - 1; // set all lower bits to 1
do {
$rnd = hexdec(bin2hex(openssl_random_pseudo_bytes($bytes)));
$rnd = $rnd & $filter; // discard irrelevant bits
} while ($rnd >= $range);
return $min + $rnd;
}
/**
* Finally, generate a hashed token
* @param integer $length
* @return string
*/
public static function getHashedToken($length = 25)
{
$token = "";
$max = strlen(static::getPool());
for ($i = 0; $i < $length; $i++) {
$token .= static::getPool()[static::secureCrypt(0, $max)];
}
return $token;
}
}