Segment Tracking Pixel (for email)

app.js

'use strict';

/*
 * Build a tracking pixel for segment-dot-i-o,
 * to use places where javascript wont go,
 * in the rain, the sleet, the ice and the snow,
 * or just in email, ya-know?
 *
 * https://segment.com/docs/api/tracking/http/#tracking-pixels
 */

var express = require('express'),
  app = express();

// var Analytics = require('analytics-node'),
//   analytics = new Analytics(process.env.SEGMENT_WRITE_KEY);

var shortid = require('shortid'); // do we need this?


app.get('/', function (req, res) {
  res.send('System is ready...');
});

// image options for responding w the pixel
var options = {
  root: __dirname,
  headers: {
    'x-timestamp': Date.now(),
    'x-sent': true
  }
}

// Analytics Track Event
app.get('/track/:event/:id?', function (req, res) { // event is required, id is not
  console.log('event: ' + req.params.event +', id: ' + req.params.id);
  console.log('properties: ' + req.query);

  // build the message
  var message = {
    event: req.params.event,
    properties: req.query
  };

  // "You must include either a userId or anonymousId with every API call. ~Segment"
  if (typeof req.params.id !== 'undefined') {
    messagte.id = req.params.id;
  } else {
    message.anonymousId = shortid.generate(); // is this necessary?
  }

  // place async api call to segment here
  // analytics.track(message);

  // 1x1 tracking pixel
  res.sendFile('/images/1.png', options, function (error) {
    if (error) {
      console.log('error: ' + error);
    }
  });
});


// Analytics Identify
app.get('/identify/:id?', function (req, res) { // "You must include either a userId or anonymousId with every API call. ~Segment"
  console.log('id:' + req.params.id);
  console.log('traits' + req.query);

  var message = {
    userId: req.params.id,
    traits: req.query
  };

  // "You must include either a userId or anonymousId with every API call. ~Segment"
  // but why identify at all if that's the case?
  // if (typeof req.params.id !== 'undefined') {
  //   messagte.id = req.params.id;
  // } else {
  //   message.anonymousId = shortid.generate(); // is this necessary?
  // }

  // place async api call to segment here
  // analytics.identify(message);

  // 1x1 tracking pixel
  res.sendFile('/images/1.png', options, function (error) {
    if (error) {
      console.log('error: ' + error);
    }
  });
});


// do the server
var server = app.listen(3000, function () {

  var host = server.address().address;
  var port = server.address().port;

  // console.log('Example app listening at http://%s:%s', host, port);

});

Not completely sure about passing ID - especially because userID won't be available in other services than our own.