public static function readKey()
{
if (!self::keyExists()) {
throw new KeyHandlerOldException('Key file does not exist', KeyHandlerOldException::KEY_DOES_NOT_EXIST);
}
if (!is_readable(ROOT_PATH . self::$filePath)) {
throw new KeyHandlerOldException('Key is not readable', KeyHandlerOldException::KEY_NOT_READABLE);
}
if (!self::$keySet) {
self::$key = trim(file_get_contents(ROOT_PATH . self::$filePath));
self::$keySet = true;
}
return self::$key;
}
