ember-cli livereload, ssl and nginx (file from an in-repo addon)

index.js

'use strict';

/*
  ember-cli's live-reload doesn't work out of the box for our configuration
  because we run in local dev using www.yapp.dev over SSL. We use nginx to
  terminate SSL and reverse proxy appropriate requests to ember-cli.

  A configuration that gets live-reload working is implemented by this
  addon plus nginx rules. This addon includes a script tag in index.html
  as defined by the `contentFor` method below. Our standard nginx config
  proxies the script to ember-cli.

  When that script is requested, ember-cli will serve up the script in
  the `dynamicScript` method below, which in turn loads the livereload.js
  script.

  Some nginx config proxies that to ember-cli's live-reload server running
  in this project on port 37530:

    server {
      listen 80;
      listen 443 ssl;

      server_name cloudfront-standin-app.yapp.dev;

      # ...

      location ~ ^/apps/livereload.js {
        rewrite  ^/apps/(livereload.js)  /$1 break;
        proxy_pass http://localhost:37530;
      }

      # ...
    }

  livereload.js is requested with query params that cause it to make a
  secure websocket connection to cloudfront-standin-app.yapp.dev and on
  a port 100 greater than 37530 (37630). nginx config terminates SLL
  and proxies that to ember-cli's live-reload server:

    server {
      listen 37630 ssl;
      server_name cloudfront-standin-app.yapp.dev;

      location / {
        proxy_pass http://localhost:37530;
        proxy_http_version 1.1;
        proxy_set_header Upgrade $http_upgrade;
        proxy_set_header Connection "upgrade";
      }
    }

*/

module.exports = {
  name: 'live-reload',

  isDevelopingAddon: function() {
    return true;
  },

  contentFor: function(type) {
    var liveReloadPort = process.env.EMBER_CLI_INJECT_LIVE_RELOAD_PORT;

    if (liveReloadPort && type === 'head') {
      return '<script src="//cloudfront-standin-app.yapp.dev/apps/ember-cli-live-reload.js" type="text/javascript"></script>';
    }
  },

  dynamicScript: function(request) {
    var liveReloadPort = process.env.EMBER_CLI_INJECT_LIVE_RELOAD_PORT;

    return "(function() {\n " +
           "var src = 'https://cloudfront-standin-app.yapp.dev/apps/livereload.js?snipver=1&host=cloudfront-standin-app.yapp.dev&port=" + (parseInt(liveReloadPort) + 100) + "';\n " +
           "var script    = document.createElement('script');\n " +
           "script.type   = 'text/javascript';\n " +
           "script.src    = src;\n " +
           "document.getElementsByTagName('head')[0].appendChild(script);\n" +
           "}());";
  },

  serverMiddleware: function(config) {
    var self = this;
    var app = config.app;
    var options = config.options;

    if (options.liveReload !== true) { return; }

    process.env.EMBER_CLI_INJECT_LIVE_RELOAD_PORT = options.liveReloadPort;
    process.env.EMBER_CLI_INJECT_LIVE_RELOAD_BASEURL = options.baseURL; // default is '/'

    app.use(options.baseURL + 'ember-cli-live-reload.js', function(request, response, next) {
      response.contentType('text/javascript');
      response.send(self.dynamicScript());
    });
  }
};