AWS Lambda function to Slack Channel hookup

snsToSlack.js

var services = '/services/...';  // Update this with your Slack webhook URL path
var channel = '#fleet-status';  // Update this with the Slack channel to post in
var username = 'Vehicle GeoFence Alert'; //Update this with the Slack username to show on the posts

var https = require('https');
var util = require('util');

function vehicleName(vehicleId) {
  switch (vehicleId) {
    case 9999991:return "Rex";
    case 9999992:return "Toro";
    case 9999993:return "Ruby";
    case 9999994:return "Wally";
    case 9999995:return "Deuxy";
    case 9999996:return "Bravo";
    case 9999997:return "Duke";
    case 9999998:return "eHawk";
    default:"Mystery Mobile"
  }
};


exports.handler = function(event, context) {
    console.log(JSON.stringify(event, null, 2));

    var vehicleId = event.vehicle_id;

    var message = vehicleName(vehicleId) + ' is arriving at a stop! See it on the fleet dashboard: https://fleet.tesloop.com/dashboard/vehicles/' + vehicleId;

    var postData = {
        "channel": channel,
        "username": username,
        "text": message,
        "icon_emoji": ":round_pushpin:"
    };

    var options = {
        method: 'POST',
        hostname: 'hooks.slack.com',
        port: 443,
        path: 'services'
    };

    var req = https.request(options, function(res) {
      res.setEncoding('utf8');
      res.on('data', function (chunk) {
        context.done(null);
      });
    });

    req.on('error', function(err) {
      console.log('Houston, we have a problem: ' + err.message);
    });

    req.write(util.format("%j", postData));
    req.end();
};