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<?php
namespace Mmccook\JsonCanonicalizator;
class JsonCanonicalizator implements JsonCanonicalizatorInterface
{
public const JSON_FLAGS = \JSON_UNESCAPED_UNICODE | \JSON_UNESCAPED_SLASHES;
/**
* @param $data
* @param bool $asHex
* @return string
*/
public function canonicalize($data, bool $asHex = false): string
{
ob_start();
$this->serialize($data);
$result = ob_get_clean();
return $asHex ? Utils::asHex($result) : $result;
}
private function serialize($item)
{
if (is_float($item)) {
echo Utils::es6NumberFormat($item);
return;
}
if (null === $item || is_scalar($item)) {
echo json_encode($item, self::JSON_FLAGS);
return;
}
if (is_array($item) && ! Utils::isAssoc($item)) {
echo '[';
$next = false;
foreach ($item as $element) {
if ($next) {
echo ',';
}
$next = true;
$this->serialize($element);
}
echo ']';
return;
}
if (is_object($item)) {
$item = (array)$item;
}
uksort($item, function (string $a, string $b) {
$a = mb_convert_encoding($a, 'UTF-16BE');
$b = mb_convert_encoding($b, 'UTF-16BE');
return strcmp($a, $b);
});
echo '{';
$next = false;
foreach ($item as $key => $value) {
//var_dump($key, $value);
if ($next) {
echo ',';
}
$next = true;
$outKey = json_encode((string)$key, self::JSON_FLAGS);
echo $outKey, ':', $this->serialize($value);
}
echo '}';
}
}
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