File: source/template/header.js

(function() {
 
'use strict';
 
/**
 * Polyfill for Object.keys() from Mozilla
 * From https://developer.mozilla.org/en-US/docs/Web/JavaScript/Reference/Global_Objects/Object/keys
 */
if (!Object.keys) {
  Object.keys = (function() {
    var hasOwnProperty = Object.prototype.hasOwnProperty,
      hasDontEnumBug = !({
        toString: null
      }).propertyIsEnumerable('toString'),
      dontEnums = [
        'toString',
        'toLocaleString',
        'valueOf',
        'hasOwnProperty',
        'isPrototypeOf',
        'propertyIsEnumerable',
        'constructor'
      ],
      dontEnumsLength = dontEnums.length;
 
    return function(obj) {
      if (typeof obj !== 'object' && typeof obj !== 'function' || obj === null) throw new TypeError('Object.keys called on non-object');
 
      var result = [];
 
      for (var prop in obj) {
        if (hasOwnProperty.call(obj, prop)) result.push(prop);
      }
 
      if (hasDontEnumBug) {
        for (var i = 0; i < dontEnumsLength; i++) {
          if (hasOwnProperty.call(obj, dontEnums[i])) result.push(dontEnums[i]);
        }
      }
      return result;
    }
  })()
}
 
/**
 * Polyfill for Date.getISOString() from Mozilla
 * From https://developer.mozilla.org/en/docs/Web/JavaScript/Reference/Global_Objects/Date/toISOString
 */
(function() {
  function pad(number) {
    if (number < 10) {
      return '0' + number;
    }
    return number;
  }
 
  Date.prototype.toISOString = function() {
    return this.getUTCFullYear() +
      '-' + pad(this.getUTCMonth() + 1) +
      '-' + pad(this.getUTCDate()) +
      'T' + pad(this.getUTCHours()) +
      ':' + pad(this.getUTCMinutes()) +
      ':' + pad(this.getUTCSeconds()) +
      '.' + (this.getUTCMilliseconds() / 1000).toFixed(3).slice(2, 5) +
      'Z';
  };
})();
 
/**
 * Polyfill for addEventListener() from Eirik Backer @eirikbacker (github.com).
 * From https://gist.github.com/eirikbacker/2864711
 * MIT Licensed
 */
(function(win, doc){
  if(win.addEventListener) return; //No need to polyfill
 
  function docHijack(p){var old = doc[p];doc[p] = function(v){ return addListen(old(v)) }}
  function addEvent(on, fn, self){
    return (self = this).attachEvent('on' + on, function(e){
      var e = e || win.event;
      e.preventDefault  = e.preventDefault  || function(){e.returnValue = false}
      e.stopPropagation = e.stopPropagation || function(){e.cancelBubble = true}
      fn.call(self, e);
    });
  }
  function addListen(obj, i){
    if(i = obj.length)while(i--)obj[i].addEventListener = addEvent;
    else obj.addEventListener = addEvent;
    return obj;
  }
 
  addListen([doc, win]);
  if('Element' in win)win.Element.prototype.addEventListener = addEvent; //IE8
  else{                                     //IE < 8
    doc.attachEvent('onreadystatechange', function(){addListen(doc.all)}); //Make sure we also init at domReady
    docHijack('getElementsByTagName');
    docHijack('getElementById');
    docHijack('createElement');
    addListen(doc.all);
  }
})(window, document);
 
/**
 * Global function that clones an object.
 */
var clone = function (obj) {
  if (obj === null || typeof obj !== 'object') {
    return obj;
  }
 
  var copy = function (data) {
    var copy = data.constructor();
    for (var attr in data) {
      if (data.hasOwnProperty(attr)) {
        copy[attr] = data[attr];
      }
    }
    return copy;
  };
 
  if (typeof obj === 'object' && !Array.isArray(obj)) {
    try {
      return JSON.parse( JSON.stringify(obj) );
    } catch (err) {
      return copy(obj);
    }
  }
  
  return copy(obj);
};
 
/**
 * <h2>Prerequisites on using Skylink</h2>
 * Before using any Skylink functionalities, you will need to authenticate your App Key using
 *   the <a href="#method_init">`init()` method</a>.
 *
 * To manage or create App Keys, you may access the [Skylink Developer Portal here](https://console.temasys.io).
 *
 * To view the list of supported browsers, visit [the list here](
 * https://github.com/Temasys/SkylinkJS#supported-browsers).
 *
 * Here are some articles to help you get started:
 * - [How to setup a simple video call](https://temasys.com.sg/getting-started-with-webrtc-and-skylinkjs/)
 * - [How to setup screensharing](https://temasys.com.sg/screensharing-with-skylinkjs/)
 * - [How to create a chatroom like feature](https://temasys.com.sg/building-a-simple-peer-to-peer-webrtc-chat/)
 *
 * Here are some demos you may use to aid your development:
 * - Getaroom.io [[Demo](https://getaroom.io) / [Source code](https://github.com/Temasys/getaroom)]
 * - Creating a component [[Link](https://github.com/Temasys/skylink-call-button)]
 *
 * You may see the example below in the <a href="#">Constructor tab</a> to have a general idea how event subscription
 *   and the ordering of <a href="#method_init"><code>init()</code></a> and
 *   <a href="#method_joinRoom"><code>joinRoom()</code></a> methods should be called.
 *
 * If you have any issues, you may find answers to your questions in the FAQ section on [our support portal](
 * http://support.temasys.com.sg), asks questions, request features or raise bug tickets as well.
 *
 * If you would like to contribute to our SkylinkJS codebase, see [the contributing README](
 * https://github.com/Temasys/SkylinkJS/blob/master/CONTRIBUTING.md).
 *
 * [See License (Apache 2.0)](https://github.com/Temasys/SkylinkJS/blob/master/LICENSE)
 *
 * @class Skylink
 * @constructor
 * @example
 *   // Here's a simple example on how you can start using Skylink.
 *   var skylinkDemo = new Skylink();
 *
 *   // Subscribe all events first as a general guideline
 *   skylinkDemo.on("incomingStream", function (peerId, stream, peerInfo, isSelf) {
 *     if (isSelf) {
 *       attachMediaStream(document.getElementById("selfVideo"), stream);
 *     } else {
 *       var peerVideo = document.createElement("video");
 *       peerVideo.id = peerId;
 *       peerVideo.autoplay = "autoplay";
 *       document.getElementById("peersVideo").appendChild(peerVideo);
 *       attachMediaStream(peerVideo, stream);
 *     }
 *   });
 *
 *   skylinkDemo.on("peerLeft", function (peerId, peerInfo, isSelf) {
 *     if (!isSelf) {
 *       var peerVideo = document.getElementById(peerId);
 *       // do a check if peerVideo exists first
 *       if (peerVideo) {
 *         document.getElementById("peersVideo").removeChild(peerVideo);
 *       } else {
 *         console.error("Peer video for " + peerId + " is not found.");
 *       }
 *     }
 *   });
 *
 *  // init() should always be called first before other methods other than event methods like on() or off().
 *  skylinkDemo.init("YOUR_APP_KEY_HERE", function (error, success) {
 *    if (success) {
 *      skylinkDemo.joinRoom("my_room", {
 *        userData: "My Username",
 *        audio: true,
 *        video: true
 *      });
 *    }
 *  });
 * @for Skylink
 * @since 0.5.0
 */
function Skylink() {
  if (!(this instanceof Skylink)) {
    return new Skylink();
  }
}
 
/**
 * Contains the current version of Skylink Web SDK.
 * @attribute VERSION
 * @type String
 * @readOnly
 * @for Skylink
 * @since 0.1.0
 */
Skylink.prototype.VERSION = '@@version';
 
/**
 * Function that generates an <a href="https://en.wikipedia.org/wiki/Universally_unique_identifier">UUID</a> (Unique ID).
 * @method generateUUID
 * @return {String} Returns a generated UUID (Unique ID).
 * @for Skylink
 * @since 0.5.9
 */
Skylink.prototype.generateUUID = function() {
  var d = new Date().getTime();
  var uuid = 'xxxxxxxx-xxxx-4xxx-yxxx-xxxxxxxxxxxx'.replace(/[xy]/g, function(c) {
    var r = (d + Math.random() * 16) % 16 | 0;
    d = Math.floor(d / 16);
    return (c == 'x' ? r : (r & 0x7 | 0x8)).toString(16);
  });
  return uuid;
};