Jwt.php

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<?php

namespace ILIAS\LTI\ToolProvider\Jwt;

use ILIAS\LTI\ToolProvider\Util;

class Jwt
{
    public static int $life = 60;

    public static int $leeway = 180;

    public static bool $allowJkuHeader = false;

    private static ?ClientInterface $jwtClient = null; //changed ... = null

    public function __construct()
    {
    }

    public static function setJwtClient(\ILIAS\LTI\ToolProvider\Jwt\ClientInterface $jwtClient = null)
    {
        self::$jwtClient = $jwtClient;
        Util::logDebug('JwtClient set to \'' . get_class(self::$jwtClient) . '\'');
    }

    public static function getJwtClient()
    {
        if (empty(self::$jwtClient)) { //changed
            self::$jwtClient = new FirebaseClient();
            Util::logDebug('JwtClient set to \'' . get_class(self::$jwtClient) . '\'');
        }
        return self::$jwtClient;
    }
}