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<?php
namespace Shaarli\Api;
use Shaarli\Base64Url;
use Shaarli\Api\Exceptions\ApiAuthorizationException;
/**
* REST API utilities
*/
class ApiUtils
{
/**
* Validates a JWT token authenticity.
*
* @param string $token JWT token extracted from the headers.
* @param string $secret API secret set in the settings.
*
* @throws ApiAuthorizationException the token is not valid.
*/
public static function validateJwtToken($token, $secret)
{
$parts = explode('.', $token);
if (count($parts) != 3 || strlen($parts[0]) == 0 || strlen($parts[1]) == 0) {
throw new ApiAuthorizationException('Malformed JWT token');
}
$genSign = Base64Url::encode(hash_hmac('sha512', $parts[0] .'.'. $parts[1], $secret, true));
if ($parts[2] != $genSign) {
throw new ApiAuthorizationException('Invalid JWT signature');
}
$header = json_decode(Base64Url::decode($parts[0]));
if ($header === null) {
throw new ApiAuthorizationException('Invalid JWT header');
}
$payload = json_decode(Base64Url::decode($parts[1]));
if ($payload === null) {
throw new ApiAuthorizationException('Invalid JWT payload');
}
if (empty($payload->iat)
|| $payload->iat > time()
|| time() - $payload->iat > ApiMiddleware::$TOKEN_DURATION
) {
throw new ApiAuthorizationException('Invalid JWT issued time');
}
}
}
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