jiti-meet/libs/modules/desktopsharing.bundle.js

!function(e){if("object"==typeof exports&&"undefined"!=typeof module)module.exports=e();else if("function"==typeof define&&define.amd)define([],e);else{var f;"undefined"!=typeof window?f=window:"undefined"!=typeof global?f=global:"undefined"!=typeof self&&(f=self),f.desktopsharing=e()}}(function(){var define,module,exports;return (function e(t,n,r){function s(o,u){if(!n[o]){if(!t[o]){var a=typeof require=="function"&&require;if(!u&&a)return a(o,!0);if(i)return i(o,!0);var f=new Error("Cannot find module '"+o+"'");throw f.code="MODULE_NOT_FOUND",f}var l=n[o]={exports:{}};t[o][0].call(l.exports,function(e){var n=t[o][1][e];return s(n?n:e)},l,l.exports,e,t,n,r)}return n[o].exports}var i=typeof require=="function"&&require;for(var o=0;o<r.length;o++)s(r[o]);return s})({1:[function(require,module,exports){
/* global $, alert, changeLocalVideo, chrome, config, getConferenceHandler, getUserMediaWithConstraints */
/**
 * Indicates that desktop stream is currently in use(for toggle purpose).
 * @type {boolean}
 */
var isUsingScreenStream = false;
/**
 * Indicates that switch stream operation is in progress and prevent from triggering new events.
 * @type {boolean}
 */
var switchInProgress = false;

/**
 * Method used to get screen sharing stream.
 *
 * @type {function (stream_callback, failure_callback}
 */
var obtainDesktopStream = null;

/**
 * Flag used to cache desktop sharing enabled state. Do not use directly as it can be <tt>null</tt>.
 * @type {null|boolean}
 */
var _desktopSharingEnabled = null;

var EventEmitter = require("events");

var eventEmitter = new EventEmitter();

/**
 * Method obtains desktop stream from WebRTC 'screen' source.
 * Flag 'chrome://flags/#enable-usermedia-screen-capture' must be enabled.
 */
function obtainWebRTCScreen(streamCallback, failCallback) {
    RTC.getUserMediaWithConstraints(
        ['screen'],
        streamCallback,
        failCallback
    );
}

/**
 * Constructs inline install URL for Chrome desktop streaming extension.
 * The 'chromeExtensionId' must be defined in config.js.
 * @returns {string}
 */
function getWebStoreInstallUrl()
{
    return "https://chrome.google.com/webstore/detail/" + config.chromeExtensionId;
}

/**
 * Checks whether extension update is required.
 * @param minVersion minimal required version
 * @param extVersion current extension version
 * @returns {boolean}
 */
function isUpdateRequired(minVersion, extVersion)
{
    try
    {
        var s1 = minVersion.split('.');
        var s2 = extVersion.split('.');

        var len = Math.max(s1.length, s2.length);
        for (var i = 0; i < len; i++)
        {
            var n1 = 0,
                n2 = 0;

            if (i < s1.length)
                n1 = parseInt(s1[i]);
            if (i < s2.length)
                n2 = parseInt(s2[i]);

            if (isNaN(n1) || isNaN(n2))
            {
                return true;
            }
            else if (n1 !== n2)
            {
                return n1 > n2;
            }
        }

        // will happen if boths version has identical numbers in
        // their components (even if one of them is longer, has more components)
        return false;
    }
    catch (e)
    {
        console.error("Failed to parse extension version", e);
        UI.messageHandler.showError('Error',
            'Error when trying to detect desktopsharing extension.');
        return true;
    }
}


function checkExtInstalled(isInstalledCallback) {
    if (!chrome.runtime) {
        // No API, so no extension for sure
        isInstalledCallback(false);
        return;
    }
    chrome.runtime.sendMessage(
        config.chromeExtensionId,
        { getVersion: true },
        function (response) {
            if (!response || !response.version) {
                // Communication failure - assume that no endpoint exists
                console.warn("Extension not installed?: " + chrome.runtime.lastError);
                isInstalledCallback(false);
            } else {
                // Check installed extension version
                var extVersion = response.version;
                console.log('Extension version is: ' + extVersion);
                var updateRequired = isUpdateRequired(config.minChromeExtVersion, extVersion);
                if (updateRequired) {
                    alert(
                        'Jitsi Desktop Streamer requires update. ' +
                        'Changes will take effect after next Chrome restart.');
                }
                isInstalledCallback(!updateRequired);
            }
        }
    );
}

function doGetStreamFromExtension(streamCallback, failCallback) {
    // Sends 'getStream' msg to the extension. Extension id must be defined in the config.
    chrome.runtime.sendMessage(
        config.chromeExtensionId,
        { getStream: true, sources: config.desktopSharingSources },
        function (response) {
            if (!response) {
                failCallback(chrome.runtime.lastError);
                return;
            }
            console.log("Response from extension: " + response);
            if (response.streamId) {
                RTC.getUserMediaWithConstraints(
                    ['desktop'],
                    function (stream) {
                        streamCallback(stream);
                    },
                    failCallback,
                    null, null, null,
                    response.streamId);
            } else {
                failCallback("Extension failed to get the stream");
            }
        }
    );
}
/**
 * Asks Chrome extension to call chooseDesktopMedia and gets chrome 'desktop' stream for returned stream token.
 */
function obtainScreenFromExtension(streamCallback, failCallback) {
    checkExtInstalled(
        function (isInstalled) {
            if (isInstalled) {
                doGetStreamFromExtension(streamCallback, failCallback);
            } else {
                chrome.webstore.install(
                    getWebStoreInstallUrl(),
                    function (arg) {
                        console.log("Extension installed successfully", arg);
                        // We need to reload the page in order to get the access to chrome.runtime
                        window.location.reload(false);
                    },
                    function (arg) {
                        console.log("Failed to install the extension", arg);
                        failCallback(arg);
                        UI.messageHandler.showError('Error',
                            'Failed to install desktop sharing extension');
                    }
                );
            }
        }
    );
}

/**
 * Call this method to toggle desktop sharing feature.
 * @param method pass "ext" to use chrome extension for desktop capture(chrome extension required),
 *        pass "webrtc" to use WebRTC "screen" desktop source('chrome://flags/#enable-usermedia-screen-capture'
 *        must be enabled), pass any other string or nothing in order to disable this feature completely.
 */
function setDesktopSharing(method) {
    // Check if we are running chrome
    if (!navigator.webkitGetUserMedia) {
        obtainDesktopStream = null;
        console.info("Desktop sharing disabled");
    } else if (method == "ext") {
        obtainDesktopStream = obtainScreenFromExtension;
        console.info("Using Chrome extension for desktop sharing");
    } else if (method == "webrtc") {
        obtainDesktopStream = obtainWebRTCScreen;
        console.info("Using Chrome WebRTC for desktop sharing");
    }

    // Reset enabled cache
    _desktopSharingEnabled = null;
}

/**
 * Initializes <link rel=chrome-webstore-item /> with extension id set in config.js to support inline installs.
 * Host site must be selected as main website of published extension.
 */
function initInlineInstalls()
{
    $("link[rel=chrome-webstore-item]").attr("href", getWebStoreInstallUrl());
}

function getSwitchStreamFailed(error) {
    console.error("Failed to obtain the stream to switch to", error);
    switchInProgress = false;
}

function streamSwitchDone() {
    switchInProgress = false;
    eventEmitter.emit(
        DesktopSharingEventTypes.SWITCHING_DONE,
        isUsingScreenStream);
}

function newStreamCreated(stream)
{
    eventEmitter.emit(DesktopSharingEventTypes.NEW_STREAM_CREATED,
        stream, isUsingScreenStream, streamSwitchDone);
}


module.exports = {
    isUsingScreenStream: function () {
        return isUsingScreenStream;
    },

    /**
     * @returns {boolean} <tt>true</tt> if desktop sharing feature is available and enabled.
     */
    isDesktopSharingEnabled: function () {
        if (_desktopSharingEnabled === null) {
            if (obtainDesktopStream === obtainScreenFromExtension) {
                // Parse chrome version
                var userAgent = navigator.userAgent.toLowerCase();
                // We can assume that user agent is chrome, because it's enforced when 'ext' streaming method is set
                var ver = parseInt(userAgent.match(/chrome\/(\d+)\./)[1], 10);
                console.log("Chrome version" + userAgent, ver);
                _desktopSharingEnabled = ver >= 34;
            } else {
                _desktopSharingEnabled = obtainDesktopStream === obtainWebRTCScreen;
            }
        }
        return _desktopSharingEnabled;
    },
    
    init: function () {
        setDesktopSharing(config.desktopSharing);

        // Initialize Chrome extension inline installs
        if (config.chromeExtensionId) {
            initInlineInstalls();
        }

        eventEmitter.emit(DesktopSharingEventTypes.INIT);
    },

    addListener: function(listener, type)
    {
        eventEmitter.on(type, listener);
    },

    removeListener: function (listener,type) {
        eventEmitter.removeListener(type, listener);
    },

    /*
     * Toggles screen sharing.
     */
    toggleScreenSharing: function () {
        if (switchInProgress || !obtainDesktopStream) {
            console.warn("Switch in progress or no method defined");
            return;
        }
        switchInProgress = true;

        if (!isUsingScreenStream)
        {
            // Switch to desktop stream
            obtainDesktopStream(
                function (stream) {
                    // We now use screen stream
                    isUsingScreenStream = true;
                    // Hook 'ended' event to restore camera when screen stream stops
                    stream.addEventListener('ended',
                        function (e) {
                            if (!switchInProgress && isUsingScreenStream) {
                                toggleScreenSharing();
                            }
                        }
                    );
                    newStreamCreated(stream);
                },
                getSwitchStreamFailed);
        } else {
            // Disable screen stream
            RTC.getUserMediaWithConstraints(
                ['video'],
                function (stream) {
                    // We are now using camera stream
                    isUsingScreenStream = false;
                    newStreamCreated(stream);
                },
                getSwitchStreamFailed, config.resolution || '360'
            );
        }
    }
};


},{"events":2}],2:[function(require,module,exports){
// Copyright Joyent, Inc. and other Node contributors.
//
// Permission is hereby granted, free of charge, to any person obtaining a
// copy of this software and associated documentation files (the
// "Software"), to deal in the Software without restriction, including
// without limitation the rights to use, copy, modify, merge, publish,
// distribute, sublicense, and/or sell copies of the Software, and to permit
// persons to whom the Software is furnished to do so, subject to the
// following conditions:
//
// The above copyright notice and this permission notice shall be included
// in all copies or substantial portions of the Software.
//
// THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS
// OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
// MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN
// NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM,
// DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR
// OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE
// USE OR OTHER DEALINGS IN THE SOFTWARE.

function EventEmitter() {
  this._events = this._events || {};
  this._maxListeners = this._maxListeners || undefined;
}
module.exports = EventEmitter;

// Backwards-compat with node 0.10.x
EventEmitter.EventEmitter = EventEmitter;

EventEmitter.prototype._events = undefined;
EventEmitter.prototype._maxListeners = undefined;

// By default EventEmitters will print a warning if more than 10 listeners are
// added to it. This is a useful default which helps finding memory leaks.
EventEmitter.defaultMaxListeners = 10;

// Obviously not all Emitters should be limited to 10. This function allows
// that to be increased. Set to zero for unlimited.
EventEmitter.prototype.setMaxListeners = function(n) {
  if (!isNumber(n) || n < 0 || isNaN(n))
    throw TypeError('n must be a positive number');
  this._maxListeners = n;
  return this;
};

EventEmitter.prototype.emit = function(type) {
  var er, handler, len, args, i, listeners;

  if (!this._events)
    this._events = {};

  // If there is no 'error' event listener then throw.
  if (type === 'error') {
    if (!this._events.error ||
        (isObject(this._events.error) && !this._events.error.length)) {
      er = arguments[1];
      if (er instanceof Error) {
        throw er; // Unhandled 'error' event
      }
      throw TypeError('Uncaught, unspecified "error" event.');
    }
  }

  handler = this._events[type];

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    return false;

  if (isFunction(handler)) {
    switch (arguments.length) {
      // fast cases
      case 1:
        handler.call(this);
        break;
      case 2:
        handler.call(this, arguments[1]);
        break;
      case 3:
        handler.call(this, arguments[1], arguments[2]);
        break;
      // slower
      default:
        len = arguments.length;
        args = new Array(len - 1);
        for (i = 1; i < len; i++)
          args[i - 1] = arguments[i];
        handler.apply(this, args);
    }
  } else if (isObject(handler)) {
    len = arguments.length;
    args = new Array(len - 1);
    for (i = 1; i < len; i++)
      args[i - 1] = arguments[i];

    listeners = handler.slice();
    len = listeners.length;
    for (i = 0; i < len; i++)
      listeners[i].apply(this, args);
  }

  return true;
};

EventEmitter.prototype.addListener = function(type, listener) {
  var m;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events)
    this._events = {};

  // To avoid recursion in the case that type === "newListener"! Before
  // adding it to the listeners, first emit "newListener".
  if (this._events.newListener)
    this.emit('newListener', type,
              isFunction(listener.listener) ?
              listener.listener : listener);

  if (!this._events[type])
    // Optimize the case of one listener. Don't need the extra array object.
    this._events[type] = listener;
  else if (isObject(this._events[type]))
    // If we've already got an array, just append.
    this._events[type].push(listener);
  else
    // Adding the second element, need to change to array.
    this._events[type] = [this._events[type], listener];

  // Check for listener leak
  if (isObject(this._events[type]) && !this._events[type].warned) {
    var m;
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    } else {
      m = EventEmitter.defaultMaxListeners;
    }

    if (m && m > 0 && this._events[type].length > m) {
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      console.error('(node) warning: possible EventEmitter memory ' +
                    'leak detected. %d listeners added. ' +
                    'Use emitter.setMaxListeners() to increase limit.',
                    this._events[type].length);
      if (typeof console.trace === 'function') {
        // not supported in IE 10
        console.trace();
      }
    }
  }

  return this;
};

EventEmitter.prototype.on = EventEmitter.prototype.addListener;

EventEmitter.prototype.once = function(type, listener) {
  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  var fired = false;

  function g() {
    this.removeListener(type, g);

    if (!fired) {
      fired = true;
      listener.apply(this, arguments);
    }
  }

  g.listener = listener;
  this.on(type, g);

  return this;
};

// emits a 'removeListener' event iff the listener was removed
EventEmitter.prototype.removeListener = function(type, listener) {
  var list, position, length, i;

  if (!isFunction(listener))
    throw TypeError('listener must be a function');

  if (!this._events || !this._events[type])
    return this;

  list = this._events[type];
  length = list.length;
  position = -1;

  if (list === listener ||
      (isFunction(list.listener) && list.listener === listener)) {
    delete this._events[type];
    if (this._events.removeListener)
      this.emit('removeListener', type, listener);

  } else if (isObject(list)) {
    for (i = length; i-- > 0;) {
      if (list[i] === listener ||
          (list[i].listener && list[i].listener === listener)) {
        position = i;
        break;
      }
    }

    if (position < 0)
      return this;

    if (list.length === 1) {
      list.length = 0;
      delete this._events[type];
    } else {
      list.splice(position, 1);
    }

    if (this._events.removeListener)
      this.emit('removeListener', type, listener);
  }

  return this;
};

EventEmitter.prototype.removeAllListeners = function(type) {
  var key, listeners;

  if (!this._events)
    return this;

  // not listening for removeListener, no need to emit
  if (!this._events.removeListener) {
    if (arguments.length === 0)
      this._events = {};
    else if (this._events[type])
      delete this._events[type];
    return this;
  }

  // emit removeListener for all listeners on all events
  if (arguments.length === 0) {
    for (key in this._events) {
      if (key === 'removeListener') continue;
      this.removeAllListeners(key);
    }
    this.removeAllListeners('removeListener');
    this._events = {};
    return this;
  }

  listeners = this._events[type];

  if (isFunction(listeners)) {
    this.removeListener(type, listeners);
  } else {
    // LIFO order
    while (listeners.length)
      this.removeListener(type, listeners[listeners.length - 1]);
  }
  delete this._events[type];

  return this;
};

EventEmitter.prototype.listeners = function(type) {
  var ret;
  if (!this._events || !this._events[type])
    ret = [];
  else if (isFunction(this._events[type]))
    ret = [this._events[type]];
  else
    ret = this._events[type].slice();
  return ret;
};

EventEmitter.listenerCount = function(emitter, type) {
  var ret;
  if (!emitter._events || !emitter._events[type])
    ret = 0;
  else if (isFunction(emitter._events[type]))
    ret = 1;
  else
    ret = emitter._events[type].length;
  return ret;
};

function isFunction(arg) {
  return typeof arg === 'function';
}

function isNumber(arg) {
  return typeof arg === 'number';
}

function isObject(arg) {
  return typeof arg === 'object' && arg !== null;
}

function isUndefined(arg) {
  return arg === void 0;
}

},{}]},{},[1])(1)
});