@shwao/express-fingerprint/lib/index.js

Client fingerprint server implementation. Fork of https://github.com/yusukeshibata/express-fingerprint. Adds IP and DNT parameter.

"use strict";

var _murmurhash3js = _interopRequireDefault(require("murmurhash3js"));

var _async = _interopRequireDefault(require("async"));

var _parameters = _interopRequireDefault(require("./parameters"));

var _traverse = _interopRequireDefault(require("traverse"));

function _interopRequireDefault(obj) { return obj && obj.__esModule ? obj : { default: obj }; }

const hash = _murmurhash3js.default.x64;

const Fingerprint = function (parameters) {
  if (!parameters || !parameters.length) {
    parameters = [Fingerprint.useragent(), Fingerprint.acceptHeaders(), Fingerprint.geoIp(), Fingerprint.ip(), Fingerprint.dnt()];
  }

  return (req, res, next) => {
    const components = {};
    const fingerprint = {
      hash: null
    };

    _async.default.eachLimit(parameters, 1, (parameter, callback) => {
      parameter.bind({
        req
      })((err, obj) => {
        Object.keys(obj).forEach(key => {
          components[key] = obj[key];
        });
        callback(err);
      });
    }, err => {
      if (!err) {
        const leaves = (0, _traverse.default)(components).reduce(function (acc, x) {
          if (this.isLeaf) acc.push(x);
          return acc;
        }, []);
        fingerprint.hash = hash.hash128(leaves.join('~~~'));
        fingerprint.components = components;
        req.fingerprint = fingerprint;
      }

      next();
    });
  };
};

for (const key in _parameters.default) {
  Fingerprint[key] = _parameters.default[key];
}

exports = module.exports = Fingerprint;