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<?php
/**
* Helpers
*/
class Helpers
{
/**
* parse body
*/
public static function parseBody()
{
try {
$raw = file_get_contents('php://input');
$raw = json_decode($raw);
if (is_object($raw)) {
$conf = json_decode(file_get_contents(__DIR__ . '/api.json'));
// self::stub($raw->data);
self::checkNonce($conf->api->API_KEY, $raw->nonce, $raw->hash);
return $raw;
} else {
throw new \Exception('Payload other than json will not be accepted');
}
} catch (\Exception $e) {
die(self::error([
'success' => false,
'message' => $e->getMessage()
]));
}
}
/**
* send the response
*/
public function send($data)
{
header('Content-type: application/json');
try {
echo json_encode($data);
} catch (\Exception $e) {
die($e->getMessage());
}
}
/**
* Send error response
*/
public static function error($data)
{
http_response_code(500);
die(json_encode($data));
}
/**
* Send success response
*/
public static function success($data)
{
http_response_code(200);
die(json_encode([
'success' => 'true',
'data' => $data
]));
}
/**
* check nonce
*/
public static function checknonce($key, $nonce, $hash)
{
if (empty($key)) {
throw new \Exception('Missing key');
}
if (empty($nonce) || empty($hash)) {
throw new \Exception('Missing nonce or hash');
}
if ((time() - $nonce) > 120) { // time out in second
throw new \Exception('Expired nonce');
}
$enc = hash_hmac('sha256', $nonce, $key);
if (! hash_equals($enc, $hash)) {
throw new \Exception('Invalid key');
}
}
private static function stub()
{
// $nonce = time();
// $conf = json_decode(file_get_contents(__DIR__ . '/api.json'));
// $hash = hash_hmac('sha256', $nonce, $conf->api->API_KEY);
// echo $hash . '|';
// echo $nonce;
// die();
}
}
// init
$helpers = new Helpers();