@ch1/browser-dna-express/dist/browser-dna-express.js

Browser DNA Express is a tool for fingerprinting browsers with express

import { noop, toGtZeroIntMax, toString, toStringArrayMax, toStringMax } from '@ch1/utility';
export function fingerprint() {
    return (req, res, next) => {
        connectionFingerprint(req, res, noop);
        serverFingerprint(req, res, noop);
        if (req.method !== 'OPTIONS') {
            clientFingerprint(req, res, noop);
        }
        next();
    };
}
export function connectionFingerprint(req, res, next) {
    const connectionFingerprint = {
        ip: cleanExpressIp(req.ip),
        referrer: toStringMax(2000, req.get('Referer')),
        method: toStringMax(16, req.method)
    };
    req.fingerprint = req.fingerprint || {};
    req.fingerprint.connection = connectionFingerprint;
    res.locals.fingerprint = res.locals.fingerprint || {};
    res.locals.fingerprint.connection = connectionFingerprint;
    next();
}
export function serverFingerprint(req, res, next) {
    const serverFingerprint = {
        language: toStringMax(64, req.get('Accept-Language')),
        userAgent: toStringMax(512, req.get('User-Agent')),
        usesDnt: parseInt(toString(req.get('DNT')), 10) ? true : false
    };
    req.fingerprint = req.fingerprint || {};
    req.fingerprint.server = serverFingerprint;
    res.locals.fingerprint = res.locals.fingerprint || {};
    res.locals.fingerprint.server = serverFingerprint;
    next();
}
export function clientFingerprint(req, res, next) {
    if (!req.body.fingerprint) {
        next();
        return;
    }
    const fp = req.body.fingerprint;
    const clientFingerprint = {
        browserDepth: toGtZeroIntMax(50000, fp.browserDepth),
        browserHeight: toGtZeroIntMax(50000, fp.browserHeight),
        browserWidth: toGtZeroIntMax(50000, fp.browserWidth),
        concurrency: toGtZeroIntMax(512, fp.concurrency),
        os: toStringMax(32, fp.os),
        plugins: toStringArrayMax(25, fp.plugins),
        tzOffset: parseInt(fp.tzOffset, 10),
        usesCookies: fp.usesCookies ? true : false,
        usesTouch: fp.usesTouch ? true : false
    };
    req.fingerprint = req.fingerprint || {};
    req.fingerprint.client = clientFingerprint;
    res.locals.fingerprint = res.locals.fingerprint || {};
    res.locals.fingerprint.client = clientFingerprint;
    next();
}
export function cleanExpressIp(ip) {
    const splits = ip.split(':').filter(Boolean);
    return splits[splits.length - 1];
}
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