ui/lib/shared/addon/utils/load-script.js

import { Promise as EmberPromise, resolve } from 'rsvp';
import { parseUrl } from './util';

let nextId = 1;

export function loadScript(url, id, timeout=30000) {
  if ( !id ) {
    id="loadScript-" + nextId;
    nextId++;
  }

  if ( $(`#${id}`).length > 0 ) {
    return resolve(null, 'Already loaded: ' + url);
  }

  return new EmberPromise(function(resolve,reject) {
    let timer = setTimeout(function() {
      reject({type: 'error', message: 'Timeout loading ' + url});
    }, timeout);

    let script = document.createElement('script');
    script.onload  = function(arg) {
      clearTimeout(timer);
      resolve(arg);
    };
    script.onerror = function(arg) {
      clearTimeout(timer);
      reject(arg);
    }
    script.src = url;
    script.id = id;
    document.getElementsByTagName('BODY')[0].appendChild(script);

  });
}

export function loadStylesheet(url, id, timeout=30000) {
  if ( !id ) {
    id="loadStylesheet-" + nextId;
    nextId++;
  }

  if ( $(`#${id}`).length > 0 ) {
    return resolve(null, 'Already loaded: ' + url);
  }

  return new EmberPromise(function(resolve,reject) {
    let timer = setTimeout(function() {
      reject({type: 'error', message: 'Timeout loading ' + url});
    }, timeout);

    let link     = document.createElement('link');
    link.onload  = function(arg) {
      clearTimeout(timer);
      resolve(arg);
    };
    link.onerror = function(arg) {
      clearTimeout(timer);
      reject(arg);
    }
    link.rel = 'stylesheet';
    link.src = url;
    link.href = url;
    link.id = id;
    document.getElementsByTagName('HEAD')[0].appendChild(link);

  });
}

export function proxifyUrl(url, proxyBase) {
  let parsed = parseUrl(url);

  if ( parsed.hostname.indexOf('.') === -1  || // No dot, local name like localhost
       parsed.hostname.toLowerCase().match(/\.local$/) || // your-macbook.local
       parsed.origin.toLowerCase() === window.location.origin // You are here
     ) {
    return url;
  } else {
    return  proxyBase + '/' + url;
  }
}