Config.php

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<?php
namespace SimpleSAML\Utils;

class Config
{

    public static function getCertPath($path)
    {
        if (!is_string($path)) {
            throw new \InvalidArgumentException('Invalid input parameters.');
        }

        $globalConfig = \SimpleSAML_Configuration::getInstance();
        $base = $globalConfig->getPathValue('certdir', 'cert/');
        return System::resolvePath($path, $base);
    }


    public static function getSecretSalt()
    {
        $secretSalt = \SimpleSAML_Configuration::getInstance()->getString('secretsalt');
        if ($secretSalt === 'defaultsecretsalt') {
            throw new \InvalidArgumentException('The "secretsalt" configuration option must be set to a secret value.');
        }

        return $secretSalt;
    }

    public static function getConfigDir()
    {
        $configDir    = dirname(dirname(dirname(__DIR__))) . '/config';
        $configDirEnv = getenv('SIMPLESAMLPHP_CONFIG_DIR');
        if ($configDirEnv !== false) {
            if (!is_dir($configDirEnv)) {
                throw new \InvalidArgumentException(
                    sprintf(
                        'Config directory specified by environment variable SIMPLESAMLPHP_CONFIG_DIR is not a ' .
                        'directory.  Given: "%s"',
                        $configDirEnv
                    )
                );
            }
            $configDir = $configDirEnv;
        }

        return $configDir;
    }
}