<?php
namespace ParagonIE\CipherSweet\Transformation;
use ParagonIE\CipherSweet\Contract\TransformationInterface;
use ParagonIE\ConstantTime\Base64UrlSafe;
use ParagonIE\ConstantTime\Binary;
use ParagonIE\ConstantTime\Hex;
use ParagonIE_Sodium_Core_Util as SodiumUtil;
/**
* Class Compound
* @package ParagonIE\CipherSweet\Transformation
*/
class Compound implements TransformationInterface
{
/**
* @param mixed $input
*
* @return string
* @throws \Exception
*/
public function __invoke($input)
{
if (!\is_array($input)) {
throw new \TypeError('Compound Transformation expects an array');
}
return (string) \json_encode($this->processArray($input));
}
/**
* @param string $string
* @return string
*/
public function packString($string)
{
$len = Binary::safeStrlen($string);
$l = Hex::encode(SodiumUtil::store64_le($len));
return $l . Base64UrlSafe::encode($string);
}
/**
* @param array $input
* @param int $layer
*
* @return array|string
* @throws \Exception
*/
public function processArray(array $input, $layer = 0)
{
if ($layer > 255) {
throw new \Exception('Too much recursion');
}
$array = [];
/**
* @var string|int $key
* @var array|string|int|bool|null|float $value
*/
foreach ($input as $key => $value) {
if (\is_array($value)) {
$array[$key] = $this->processArray($value, $layer + 1);
continue;
}
if (\is_float($value)) {
$array[$key] = $this->packString((string) $value);
continue;
}
if (\is_string($value)) {
$array[$key] = $this->packString($value);
continue;
}
$array[$key] = $value;
}
return $array;
}
}
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