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// Copyright (c) 2016 Mattermost, Inc. All Rights Reserved.
// See License.txt for license information.
export default class WebrtcClient {
constructor() {
this.init = this.init.bind(this);
this.listDevices = this.listDevices.bind(this);
this.isExtensionEnabled = this.isExtensionEnabled.bind(this);
this.isWebrtcSupported = this.isWebrtcSupported.bind(this);
this.initDone = false;
this.sessions = {};
}
noop() {} //eslint-disable-line no-empty-function
// this function is going to be needed when we enable screen sharing
isExtensionEnabled() {
if (window.navigator.userAgent.match('Chrome')) {
const chromever = parseInt(window.navigator.userAgent.match(/Chrome\/(.*) /)[1], 10);
let maxver = 33;
if (window.navigator.userAgent.match('Linux')) {
maxver = 35; // "known" crash in chrome 34 and 35 on linux
}
if (chromever >= 26 && chromever <= maxver) {
// Older versions of Chrome don't support this extension-based approach, so lie
return true;
}
return (document.getElementById('mattermost-extension-installed') !== null);
}
// Firefox of others, no need for the extension (but this doesn't mean it will work)
return true;
}
init(opts) {
const options = opts || {};
if (this.initDone === true) {
// Already initialized
return;
}
this.trace = this.noop;
this.debug = this.noop;
this.log = this.noop;
this.warn = this.noop;
this.error = this.noop;
/* eslint-disable */
if (options.debug === true || options.debug === 'all') {
// Enable all debugging levels
this.trace = console.trace.bind(console);
this.debug = console.debug.bind(console);
this.log = console.log.bind(console);
this.warn = console.warn.bind(console);
this.error = console.error.bind(console);
} else if (Array.isArray(options.debug)) {
for (const i in options.debug) {
if (options.debug.hasOwnProperty(i)) {
const d = options.debug[i];
switch (d) {
case 'trace':
this.trace = console.trace.bind(console);
break;
case 'debug':
this.debug = console.debug.bind(console);
break;
case 'log':
this.log = console.log.bind(console);
break;
case 'warn':
this.warn = console.warn.bind(console);
break;
case 'error':
this.error = console.error.bind(console);
break;
default:
console.error("Unknown debugging option '" + d + "' (supported: 'trace', 'debug', 'log', warn', 'error')");
break;
}
}
}
}
/* eslint-enable */
this.log('Initializing WebRTC Client library');
// Detect tab close
window.onbeforeunload = () => {
this.log('Closing window');
for (const s in this.sessions) {
if (this.sessions.hasOwnProperty(s)) {
if (this.sessions[s] && this.sessions[s].destroyOnUnload) {
this.log('Destroying session ' + s);
this.sessions[s].destroy();
}
}
}
};
this.initDone = true;
}
// Helper method to enumerate devices
listDevices(cb) {
const callback = (typeof cb == 'function') ? cb : this.noop;
if (navigator.mediaDevices) {
navigator.getUserMedia({audio: true, video: true}, (stream) => {
navigator.mediaDevices.enumerateDevices().then((devices) => {
this.debug(devices);
callback(devices);
// Get rid of the now useless stream
try {
stream.stop();
} catch (e) {
this.error(e);
}
this.stopMedia(stream);
});
}, (err) => {
this.error(err);
callback([]);
});
} else {
this.warn('navigator.mediaDevices unavailable');
callback([]);
}
}
// Helper method to check whether WebRTC is supported by this browser
isWebrtcSupported() {
return window.RTCPeerConnection && navigator.getUserMedia;
}
stopMedia(stream) {
const tracks = stream.getTracks();
tracks.forEach((track) => {
track.stop();
});
}
}
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