check-sign/lib/index.es.js

Модуль, для проверки подписи.

const crypto = require('crypto');
const getQueryParams = (url) => {
    var queryParams = {};
    var sign = '';
    let queryStrings = url.match(/\?/) ? url.split('?') : url;
    if (typeof queryStrings === 'object') {
        queryStrings = queryStrings[queryStrings.length - 1];
    }
    let urlParams = new URLSearchParams(queryStrings);
    urlParams.sort();
    const entries = urlParams.entries();
    for (const pair of entries) {
        if (pair[0].slice(0, 3) === 'vk_') {
            queryParams[pair[0]] = pair[1];
        }
        else if (pair[0] === 'sign') {
            sign = pair[1];
        }
    }
    return { sign, queryParams };
};
const getQueryParamsString = (queryParams) => {
    return Object.keys(queryParams)
        .map((key) => key + '=' + queryParams[key])
        .join('&');
};
const chars = {
    '+': '-',
    '/': '_',
    '=': '',
};
var index = ({ url, key }) => {
    const params = getQueryParams(url);
    const paramsString = getQueryParamsString(params.queryParams);
    const rawSign = crypto.createHmac('sha256', key).update(paramsString).digest('base64');
    const sign = rawSign.replace(/\+|\/|=$/gi, (char) => {
        return chars[char];
    });
    return sign === params.sign;
};

export default index;
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