const regexInt = RegExp(/^[1-9]\d*$/);
const regexXSS = RegExp(/<[^>]*script/);

// Check if int for param validation
const paramIntCheck = (req, res, next, input) => {
    try {
        if (regexInt.test(input)) {
            next();
        } else {
            throw new Error;
        }
    } catch (err) {
        res.status(err.code).send(JSON.stringify({
            "message": "Le paramètre doit être un entier non-nul.",
            "code": 403,
        })
        );
    }
};

// Check if script injection attempt
const isXSSAttempt = (string) => {
    return regexXSS.test(string);
};

// Check if object is null
const isEmptyObject = (obj) => {
    return (Object.keys(obj).length === 0 && obj.constructor === Object);
};

module.exports = {
    paramIntCheck,
    isXSSAttempt,
    isEmptyObject
};