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janus.js
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"use strict";
/*
The MIT License (MIT)
Copyright (c) 2016 Meetecho
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.
*/
// List of sessions
Janus.sessions = {};
Janus.isExtensionEnabled = function() {
if(navigator.mediaDevices && navigator.mediaDevices.getDisplayMedia) {
// No need for the extension, getDisplayMedia is supported
return true;
}
if(window.navigator.userAgent.match('Chrome')) {
var chromever = parseInt(window.navigator.userAgent.match(/Chrome\/(.*) /)[1], 10);
var 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 Janus.extension.isInstalled();
} else {
// Firefox and others, no need for the extension (but this doesn't mean it will work)
return true;
}
};
var defaultExtension = {
// Screensharing Chrome Extension ID
extensionId: 'hapfgfdkleiggjjpfpenajgdnfckjpaj',
isInstalled: function() { return document.querySelector('#janus-extension-installed') !== null; },
getScreen: function (callback) {
var pending = window.setTimeout(function () {
var error = new Error('NavigatorUserMediaError');
error.name = 'The required Chrome extension is not installed: click <a href="#">here</a> to install it. (NOTE: this will need you to refresh the page)';
return callback(error);
}, 1000);
this.cache[pending] = callback;
window.postMessage({ type: 'janusGetScreen', id: pending }, '*');
},
init: function () {
var cache = {};
this.cache = cache;
// Wait for events from the Chrome Extension
window.addEventListener('message', function (event) {
if(event.origin != window.location.origin)
return;
if(event.data.type == 'janusGotScreen' && cache[event.data.id]) {
var callback = cache[event.data.id];
delete cache[event.data.id];
if (event.data.sourceId === '') {
// user canceled
var error = new Error('NavigatorUserMediaError');
error.name = 'You cancelled the request for permission, giving up...';
callback(error);
} else {
callback(null, event.data.sourceId);
}
} else if (event.data.type == 'janusGetScreenPending') {
console.log('clearing ', event.data.id);
window.clearTimeout(event.data.id);
}
});
}
};
Janus.useDefaultDependencies = function (deps) {
var f = (deps && deps.fetch) || fetch;
var p = (deps && deps.Promise) || Promise;
var socketCls = (deps && deps.WebSocket) || WebSocket;
return {
newWebSocket: function(server, proto) { return new socketCls(server, proto); },
extension: (deps && deps.extension) || defaultExtension,
isArray: function(arr) { return Array.isArray(arr); },
webRTCAdapter: (deps && deps.adapter) || adapter,
httpAPICall: function(url, options) {
var fetchOptions = {
method: options.verb,
headers: {
'Accept': 'application/json, text/plain, */*'
},
cache: 'no-cache'
};
if(options.verb === "POST") {
fetchOptions.headers['Content-Type'] = 'application/json';
}
if(options.withCredentials !== undefined) {
fetchOptions.credentials = options.withCredentials === true ? 'include' : (options.withCredentials ? options.withCredentials : 'omit');
}
if(options.body) {
fetchOptions.body = JSON.stringify(options.body);
}
var fetching = f(url, fetchOptions).catch(function(error) {
return p.reject({message: 'Probably a network error, is the server down?', error: error});
});
/*
* fetch() does not natively support timeouts.
* Work around this by starting a timeout manually, and racing it agains the fetch() to see which thing resolves first.
*/
if(options.timeout) {
var timeout = new p(function(resolve, reject) {
var timerId = setTimeout(function() {
clearTimeout(timerId);
return reject({message: 'Request timed out', timeout: options.timeout});
}, options.timeout);
});
fetching = p.race([fetching, timeout]);
}
fetching.then(function(response) {
if(response.ok) {
if(typeof(options.success) === typeof(Janus.noop)) {
return response.json().then(function(parsed) {
try {
options.success(parsed);
} catch(error) {
Janus.error('Unhandled httpAPICall success callback error', error);
}
}, function(error) {
return p.reject({message: 'Failed to parse response body', error: error, response: response});
});
}
}
else {
return p.reject({message: 'API call failed', response: response});
}
}).catch(function(error) {
if(typeof(options.error) === typeof(Janus.noop)) {
options.error(error.message || '<< internal error >>', error);
}
});
return fetching;
}
}
};
Janus.useOldDependencies = function (deps) {
var jq = (deps && deps.jQuery) || jQuery;
var socketCls = (deps && deps.WebSocket) || WebSocket;
return {
newWebSocket: function(server, proto) { return new socketCls(server, proto); },
isArray: function(arr) { return jq.isArray(arr); },
extension: (deps && deps.extension) || defaultExtension,
webRTCAdapter: (deps && deps.adapter) || adapter,
httpAPICall: function(url, options) {
var payload = options.body !== undefined ? {
contentType: 'application/json',
data: JSON.stringify(options.body)
} : {};
var credentials = options.withCredentials !== undefined ? {xhrFields: {withCredentials: options.withCredentials}} : {};
return jq.ajax(jq.extend(payload, credentials, {
url: url,
type: options.verb,
cache: false,
dataType: 'json',
async: options.async,
timeout: options.timeout,
success: function(result) {
if(typeof(options.success) === typeof(Janus.noop)) {
options.success(result);
}
},
error: function(xhr, status, err) {
if(typeof(options.error) === typeof(Janus.noop)) {
options.error(status, err);
}
}
}));
}
};
};
Janus.noop = function() {};
Janus.dataChanDefaultLabel = "JanusDataChannel";
// Note: in the future we may want to change this, e.g., as was
// attempted in https://github.com/meetecho/janus-gateway/issues/1670
Janus.endOfCandidates = null;
// Stop all tracks from a given stream
Janus.stopAllTracks = function(stream) {
try {
// Try a MediaStreamTrack.stop() for each track
var tracks = stream.getTracks();
for(var mst of tracks) {
Janus.log(mst);
if(mst) {
mst.stop();
}
}
} catch(e) {
// Do nothing if this fails
}
}
// Initialization
Janus.init = function(options) {
options = options || {};
options.callback = (typeof options.callback == "function") ? options.callback : Janus.noop;
if(Janus.initDone) {
// Already initialized
options.callback();
} else {
if(typeof console.log == "undefined") {
console.log = function() {};
}
// Console logging (all debugging disabled by default)
Janus.trace = Janus.noop;
Janus.debug = Janus.noop;
Janus.vdebug = Janus.noop;
Janus.log = Janus.noop;
Janus.warn = Janus.noop;
Janus.error = Janus.noop;
if(options.debug === true || options.debug === "all") {
// Enable all debugging levels
Janus.trace = console.trace.bind(console);
Janus.debug = console.debug.bind(console);
Janus.vdebug = console.debug.bind(console);
Janus.log = console.log.bind(console);
Janus.warn = console.warn.bind(console);
Janus.error = console.error.bind(console);
} else if(Array.isArray(options.debug)) {
for(var d of options.debug) {
switch(d) {
case "trace":
Janus.trace = console.trace.bind(console);
break;
case "debug":
Janus.debug = console.debug.bind(console);
break;
case "vdebug":
Janus.vdebug = console.debug.bind(console);
break;
case "log":
Janus.log = console.log.bind(console);
break;
case "warn":
Janus.warn = console.warn.bind(console);
break;
case "error":
Janus.error = console.error.bind(console);
break;
default:
console.error("Unknown debugging option '" + d + "' (supported: 'trace', 'debug', 'vdebug', 'log', warn', 'error')");
break;
}
}
}
Janus.log("Initializing library");
var usedDependencies = options.dependencies || Janus.useDefaultDependencies();
Janus.isArray = usedDependencies.isArray;
Janus.webRTCAdapter = usedDependencies.webRTCAdapter;
Janus.httpAPICall = usedDependencies.httpAPICall;
Janus.newWebSocket = usedDependencies.newWebSocket;
Janus.extension = usedDependencies.extension;
Janus.extension.init();
// Helper method to enumerate devices
Janus.listDevices = function(callback, config) {
callback = (typeof callback == "function") ? callback : Janus.noop;
if (config == null) config = { audio: true, video: true };
if(Janus.isGetUserMediaAvailable()) {
navigator.mediaDevices.getUserMedia(config)
.then(function(stream) {
navigator.mediaDevices.enumerateDevices().then(function(devices) {
Janus.debug(devices);
callback(devices);
// Get rid of the now useless stream
Janus.stopAllTracks(stream)
});
})
.catch(function(err) {
Janus.error(err);
callback([]);
});
} else {
Janus.warn("navigator.mediaDevices unavailable");
callback([]);
}
};
// Helper methods to attach/reattach a stream to a video element (previously part of adapter.js)
Janus.attachMediaStream = function(element, stream) {
try {
element.srcObject = stream;
} catch (e) {
try {
element.src = URL.createObjectURL(stream);
} catch (e) {
Janus.error("Error attaching stream to element");
}
}
};
Janus.reattachMediaStream = function(to, from) {
try {
to.srcObject = from.srcObject;
} catch (e) {
try {
to.src = from.src;
} catch (e) {
Janus.error("Error reattaching stream to element");
}
}
};
// Detect tab close: make sure we don't loose existing onbeforeunload handlers
// (note: for iOS we need to subscribe to a different event, 'pagehide', see
// https://gist.github.com/thehunmonkgroup/6bee8941a49b86be31a787fe8f4b8cfe)
var iOS = ['iPad', 'iPhone', 'iPod'].indexOf(navigator.platform) >= 0;
var eventName = iOS ? 'pagehide' : 'beforeunload';
var oldOBF = window["on" + eventName];
window.addEventListener(eventName, function() {
Janus.log("Closing window");
for(var s in Janus.sessions) {
if(Janus.sessions[s] && Janus.sessions[s].destroyOnUnload) {
Janus.log("Destroying session " + s);
Janus.sessions[s].destroy({unload: true, notifyDestroyed: false});
}
}
if(oldOBF && typeof oldOBF == "function") {
oldOBF();
}
});
// If this is a Safari Technology Preview, check if VP8 is supported
Janus.safariVp8 = false;
if(Janus.webRTCAdapter.browserDetails.browser === 'safari' &&
Janus.webRTCAdapter.browserDetails.version >= 605) {
// Let's see if RTCRtpSender.getCapabilities() is there
if(RTCRtpSender && RTCRtpSender.getCapabilities && RTCRtpSender.getCapabilities("video") &&
RTCRtpSender.getCapabilities("video").codecs && RTCRtpSender.getCapabilities("video").codecs.length) {
for(var codec of RTCRtpSender.getCapabilities("video").codecs) {
if(codec && codec.mimeType && codec.mimeType.toLowerCase() === "video/vp8") {
Janus.safariVp8 = true;
break;
}
}
if(Janus.safariVp8) {
Janus.log("This version of Safari supports VP8");
} else {
Janus.warn("This version of Safari does NOT support VP8: if you're using a Technology Preview, " +
"try enabling the 'WebRTC VP8 codec' setting in the 'Experimental Features' Develop menu");
}
} else {
// We do it in a very ugly way, as there's no alternative...
// We create a PeerConnection to see if VP8 is in an offer
var testpc = new RTCPeerConnection({});
testpc.createOffer({offerToReceiveVideo: true}).then(function(offer) {
Janus.safariVp8 = offer.sdp.indexOf("VP8") !== -1;
if(Janus.safariVp8) {
Janus.log("This version of Safari supports VP8");
} else {
Janus.warn("This version of Safari does NOT support VP8: if you're using a Technology Preview, " +
"try enabling the 'WebRTC VP8 codec' setting in the 'Experimental Features' Develop menu");
}
testpc.close();
testpc = null;
});
}
}
// Check if this browser supports Unified Plan and transceivers
// Based on https://codepen.io/anon/pen/ZqLwWV?editors=0010
Janus.unifiedPlan = false;
if(Janus.webRTCAdapter.browserDetails.browser === 'firefox' &&
Janus.webRTCAdapter.browserDetails.version >= 59) {
// Firefox definitely does, starting from version 59
Janus.unifiedPlan = true;
} else if(Janus.webRTCAdapter.browserDetails.browser === 'chrome' &&
Janus.webRTCAdapter.browserDetails.version >= 72) {
// Chrome does, but it's only usable from version 72 on
Janus.unifiedPlan = true;
} else if(!window.RTCRtpTransceiver || !('currentDirection' in RTCRtpTransceiver.prototype)) {
// Safari supports addTransceiver() but not Unified Plan when
// currentDirection is not defined (see codepen above).
Janus.unifiedPlan = false;
} else {
// Check if addTransceiver() throws an exception
var tempPc = new RTCPeerConnection();
try {
tempPc.addTransceiver('audio');
Janus.unifiedPlan = true;
} catch (e) {}
tempPc.close();
}
Janus.initDone = true;
options.callback();
}
};
// Helper method to check whether WebRTC is supported by this browser
Janus.isWebrtcSupported = function() {
return !!window.RTCPeerConnection;
};
// Helper method to check whether devices can be accessed by this browser (e.g., not possible via plain HTTP)
Janus.isGetUserMediaAvailable = function() {
return navigator.mediaDevices && navigator.mediaDevices.getUserMedia;
};
// Helper method to create random identifiers (e.g., transaction)
Janus.randomString = function(len) {
var charSet = 'ABCDEFGHIJKLMNOPQRSTUVWXYZabcdefghijklmnopqrstuvwxyz0123456789';
var randomString = '';
for (var i = 0; i < len; i++) {
var randomPoz = Math.floor(Math.random() * charSet.length);
randomString += charSet.substring(randomPoz,randomPoz+1);
}
return randomString;
};
function Janus(gatewayCallbacks) {
gatewayCallbacks = gatewayCallbacks || {};
gatewayCallbacks.success = (typeof gatewayCallbacks.success == "function") ? gatewayCallbacks.success : Janus.noop;
gatewayCallbacks.error = (typeof gatewayCallbacks.error == "function") ? gatewayCallbacks.error : Janus.noop;
gatewayCallbacks.destroyed = (typeof gatewayCallbacks.destroyed == "function") ? gatewayCallbacks.destroyed : Janus.noop;
if(!Janus.initDone) {
gatewayCallbacks.error("Library not initialized");
return {};
}
if(!Janus.isWebrtcSupported()) {
gatewayCallbacks.error("WebRTC not supported by this browser");
return {};
}
Janus.log("Library initialized: " + Janus.initDone);
if(!gatewayCallbacks.server) {
gatewayCallbacks.error("Invalid server url");
return {};
}
var websockets = false;
var ws = null;
var wsHandlers = {};
var wsKeepaliveTimeoutId = null;
var servers = null;
var serversIndex = 0;
var server = gatewayCallbacks.server;
if(Janus.isArray(server)) {
Janus.log("Multiple servers provided (" + server.length + "), will use the first that works");
server = null;
servers = gatewayCallbacks.server;
Janus.debug(servers);
} else {
if(server.indexOf("ws") === 0) {
websockets = true;
Janus.log("Using WebSockets to contact Janus: " + server);
} else {
websockets = false;
Janus.log("Using REST API to contact Janus: " + server);
}
}
var iceServers = gatewayCallbacks.iceServers || [{urls: "stun:stun.l.google.com:19302"}];
var iceTransportPolicy = gatewayCallbacks.iceTransportPolicy;
var bundlePolicy = gatewayCallbacks.bundlePolicy;
// Whether IPv6 candidates should be gathered
var ipv6Support = (gatewayCallbacks.ipv6 === true);
// Whether we should enable the withCredentials flag for XHR requests
var withCredentials = false;
if(gatewayCallbacks.withCredentials !== undefined && gatewayCallbacks.withCredentials !== null)
withCredentials = gatewayCallbacks.withCredentials === true;
// Optional max events
var maxev = 10;
if(gatewayCallbacks.max_poll_events !== undefined && gatewayCallbacks.max_poll_events !== null)
maxev = gatewayCallbacks.max_poll_events;
if(maxev < 1)
maxev = 1;
// Token to use (only if the token based authentication mechanism is enabled)
var token = null;
if(gatewayCallbacks.token !== undefined && gatewayCallbacks.token !== null)
token = gatewayCallbacks.token;
// API secret to use (only if the shared API secret is enabled)
var apisecret = null;
if(gatewayCallbacks.apisecret !== undefined && gatewayCallbacks.apisecret !== null)
apisecret = gatewayCallbacks.apisecret;
// Whether we should destroy this session when onbeforeunload is called
this.destroyOnUnload = true;
if(gatewayCallbacks.destroyOnUnload !== undefined && gatewayCallbacks.destroyOnUnload !== null)
this.destroyOnUnload = (gatewayCallbacks.destroyOnUnload === true);
// Some timeout-related values
var keepAlivePeriod = 25000;
if(gatewayCallbacks.keepAlivePeriod !== undefined && gatewayCallbacks.keepAlivePeriod !== null)
keepAlivePeriod = gatewayCallbacks.keepAlivePeriod;
if(isNaN(keepAlivePeriod))
keepAlivePeriod = 25000;
var longPollTimeout = 60000;
if(gatewayCallbacks.longPollTimeout !== undefined && gatewayCallbacks.longPollTimeout !== null)
longPollTimeout = gatewayCallbacks.longPollTimeout;
if(isNaN(longPollTimeout))
longPollTimeout = 60000;
// overrides for default maxBitrate values for simulcasting
function getMaxBitrates(simulcastMaxBitrates) {
var maxBitrates = {
high: 900000,
medium: 300000,
low: 100000,
};
if (simulcastMaxBitrates !== undefined && simulcastMaxBitrates !== null) {
if (simulcastMaxBitrates.high)
maxBitrates.high = simulcastMaxBitrates.high;
if (simulcastMaxBitrates.medium)
maxBitrates.medium = simulcastMaxBitrates.medium;
if (simulcastMaxBitrates.low)
maxBitrates.low = simulcastMaxBitrates.low;
}
return maxBitrates;
}
var connected = false;
var sessionId = null;
var pluginHandles = {};
var that = this;
var retries = 0;
var transactions = {};
createSession(gatewayCallbacks);
// Public methods
this.getServer = function() { return server; };
this.isConnected = function() { return connected; };
this.reconnect = function(callbacks) {
callbacks = callbacks || {};
callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
callbacks["reconnect"] = true;
createSession(callbacks);
};
this.getSessionId = function() { return sessionId; };
this.getInfo = function(callbacks) { getInfo(callbacks); };
this.destroy = function(callbacks) { destroySession(callbacks); };
this.attach = function(callbacks) { createHandle(callbacks); };
function eventHandler() {
if(sessionId == null)
return;
Janus.debug('Long poll...');
if(!connected) {
Janus.warn("Is the server down? (connected=false)");
return;
}
var longpoll = server + "/" + sessionId + "?rid=" + new Date().getTime();
if(maxev)
longpoll = longpoll + "&maxev=" + maxev;
if(token)
longpoll = longpoll + "&token=" + encodeURIComponent(token);
if(apisecret)
longpoll = longpoll + "&apisecret=" + encodeURIComponent(apisecret);
Janus.httpAPICall(longpoll, {
verb: 'GET',
withCredentials: withCredentials,
success: handleEvent,
timeout: longPollTimeout,
error: function(textStatus, errorThrown) {
Janus.error(textStatus + ":", errorThrown);
retries++;
if(retries > 3) {
// Did we just lose the server? :-(
connected = false;
gatewayCallbacks.error("Lost connection to the server (is it down?)");
return;
}
eventHandler();
}
});
}
// Private event handler: this will trigger plugin callbacks, if set
function handleEvent(json, skipTimeout) {
retries = 0;
if(!websockets && sessionId !== undefined && sessionId !== null && skipTimeout !== true)
eventHandler();
if(!websockets && Janus.isArray(json)) {
// We got an array: it means we passed a maxev > 1, iterate on all objects
for(var i=0; i<json.length; i++) {
handleEvent(json[i], true);
}
return;
}
if(json["janus"] === "keepalive") {
// Nothing happened
Janus.vdebug("Got a keepalive on session " + sessionId);
return;
} else if(json["janus"] === "server_info") {
// Just info on the Janus instance
Janus.debug("Got info on the Janus instance");
Janus.debug(json);
const transaction = json["transaction"];
if(transaction) {
const reportSuccess = transactions[transaction];
if(reportSuccess)
reportSuccess(json);
delete transactions[transaction];
}
return;
} else if(json["janus"] === "ack") {
// Just an ack, we can probably ignore
Janus.debug("Got an ack on session " + sessionId);
Janus.debug(json);
const transaction = json["transaction"];
if(transaction) {
const reportSuccess = transactions[transaction];
if(reportSuccess)
reportSuccess(json);
delete transactions[transaction];
}
return;
} else if(json["janus"] === "success") {
// Success!
Janus.debug("Got a success on session " + sessionId);
Janus.debug(json);
const transaction = json["transaction"];
if(transaction) {
const reportSuccess = transactions[transaction];
if(reportSuccess)
reportSuccess(json);
delete transactions[transaction];
}
return;
} else if(json["janus"] === "trickle") {
// We got a trickle candidate from Janus
const sender = json["sender"];
if(!sender) {
Janus.warn("Missing sender...");
return;
}
const pluginHandle = pluginHandles[sender];
if(!pluginHandle) {
Janus.debug("This handle is not attached to this session");
return;
}
var candidate = json["candidate"];
Janus.debug("Got a trickled candidate on session " + sessionId);
Janus.debug(candidate);
var config = pluginHandle.webrtcStuff;
if(config.pc && config.remoteSdp) {
// Add candidate right now
Janus.debug("Adding remote candidate:", candidate);
if(!candidate || candidate.completed === true) {
// end-of-candidates
config.pc.addIceCandidate(Janus.endOfCandidates);
} else {
// New candidate
config.pc.addIceCandidate(candidate);
}
} else {
// We didn't do setRemoteDescription (trickle got here before the offer?)
Janus.debug("We didn't do setRemoteDescription (trickle got here before the offer?), caching candidate");
if(!config.candidates)
config.candidates = [];
config.candidates.push(candidate);
Janus.debug(config.candidates);
}
} else if(json["janus"] === "webrtcup") {
// The PeerConnection with the server is up! Notify this
Janus.debug("Got a webrtcup event on session " + sessionId);
Janus.debug(json);
const sender = json["sender"];
if(!sender) {
Janus.warn("Missing sender...");
return;
}
const pluginHandle = pluginHandles[sender];
if(!pluginHandle) {
Janus.debug("This handle is not attached to this session");
return;
}
pluginHandle.webrtcState(true);
return;
} else if(json["janus"] === "hangup") {
// A plugin asked the core to hangup a PeerConnection on one of our handles
Janus.debug("Got a hangup event on session " + sessionId);
Janus.debug(json);
const sender = json["sender"];
if(!sender) {
Janus.warn("Missing sender...");
return;
}
const pluginHandle = pluginHandles[sender];
if(!pluginHandle) {
Janus.debug("This handle is not attached to this session");
return;
}
pluginHandle.webrtcState(false, json["reason"]);
pluginHandle.hangup();
} else if(json["janus"] === "detached") {
// A plugin asked the core to detach one of our handles
Janus.debug("Got a detached event on session " + sessionId);
Janus.debug(json);
const sender = json["sender"];
if(!sender) {
Janus.warn("Missing sender...");
return;
}
const pluginHandle = pluginHandles[sender];
if(!pluginHandle) {
// Don't warn here because destroyHandle causes this situation.
return;
}
pluginHandle.ondetached();
pluginHandle.detach();
} else if(json["janus"] === "media") {
// Media started/stopped flowing
Janus.debug("Got a media event on session " + sessionId);
Janus.debug(json);
const sender = json["sender"];
if(!sender) {
Janus.warn("Missing sender...");
return;
}
const pluginHandle = pluginHandles[sender];
if(!pluginHandle) {
Janus.debug("This handle is not attached to this session");
return;
}
pluginHandle.mediaState(json["type"], json["receiving"]);
} else if(json["janus"] === "slowlink") {
Janus.debug("Got a slowlink event on session " + sessionId);
Janus.debug(json);
// Trouble uplink or downlink
const sender = json["sender"];
if(!sender) {
Janus.warn("Missing sender...");
return;
}
const pluginHandle = pluginHandles[sender];
if(!pluginHandle) {
Janus.debug("This handle is not attached to this session");
return;
}
pluginHandle.slowLink(json["uplink"], json["lost"]);
} else if(json["janus"] === "error") {
// Oops, something wrong happened
Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason); // FIXME
Janus.debug(json);
var transaction = json["transaction"];
if(transaction) {
var reportSuccess = transactions[transaction];
if(reportSuccess) {
reportSuccess(json);
}
delete transactions[transaction];
}
return;
} else if(json["janus"] === "event") {
Janus.debug("Got a plugin event on session " + sessionId);
Janus.debug(json);
const sender = json["sender"];
if(!sender) {
Janus.warn("Missing sender...");
return;
}
var plugindata = json["plugindata"];
if(!plugindata) {
Janus.warn("Missing plugindata...");
return;
}
Janus.debug(" -- Event is coming from " + sender + " (" + plugindata["plugin"] + ")");
var data = plugindata["data"];
Janus.debug(data);
const pluginHandle = pluginHandles[sender];
if(!pluginHandle) {
Janus.warn("This handle is not attached to this session");
return;
}
var jsep = json["jsep"];
if(jsep) {
Janus.debug("Handling SDP as well...");
Janus.debug(jsep);
}
var callback = pluginHandle.onmessage;
if(callback) {
Janus.debug("Notifying application...");
// Send to callback specified when attaching plugin handle
callback(data, jsep);
} else {
// Send to generic callback (?)
Janus.debug("No provided notification callback");
}
} else if(json["janus"] === "timeout") {
Janus.error("Timeout on session " + sessionId);
Janus.debug(json);
if (websockets) {
ws.close(3504, "Gateway timeout");
}
return;
} else {
Janus.warn("Unknown message/event '" + json["janus"] + "' on session " + sessionId);
Janus.debug(json);
}
}
// Private helper to send keep-alive messages on WebSockets
function keepAlive() {
if(!server || !websockets || !connected)
return;
wsKeepaliveTimeoutId = setTimeout(keepAlive, keepAlivePeriod);
var request = { "janus": "keepalive", "session_id": sessionId, "transaction": Janus.randomString(12) };
if(token)
request["token"] = token;
if(apisecret)
request["apisecret"] = apisecret;
ws.send(JSON.stringify(request));
}
// Private method to create a session
function createSession(callbacks) {
var transaction = Janus.randomString(12);
var request = { "janus": "create", "transaction": transaction };
if(callbacks["reconnect"]) {
// We're reconnecting, claim the session
connected = false;
request["janus"] = "claim";
request["session_id"] = sessionId;
// If we were using websockets, ignore the old connection
if(ws) {
ws.onopen = null;
ws.onerror = null;
ws.onclose = null;
if(wsKeepaliveTimeoutId) {
clearTimeout(wsKeepaliveTimeoutId);
wsKeepaliveTimeoutId = null;
}
}
}
if(token)
request["token"] = token;
if(apisecret)
request["apisecret"] = apisecret;
if(!server && Janus.isArray(servers)) {
// We still need to find a working server from the list we were given
server = servers[serversIndex];
if(server.indexOf("ws") === 0) {
websockets = true;
Janus.log("Server #" + (serversIndex+1) + ": trying WebSockets to contact Janus (" + server + ")");
} else {
websockets = false;
Janus.log("Server #" + (serversIndex+1) + ": trying REST API to contact Janus (" + server + ")");
}
}
if(websockets) {
ws = Janus.newWebSocket(server, 'janus-protocol');
wsHandlers = {
'error': function() {
Janus.error("Error connecting to the Janus WebSockets server... " + server);
if (Janus.isArray(servers) && !callbacks["reconnect"]) {
serversIndex++;
if (serversIndex === servers.length) {
// We tried all the servers the user gave us and they all failed
callbacks.error("Error connecting to any of the provided Janus servers: Is the server down?");
return;
}
// Let's try the next server
server = null;
setTimeout(function() {
createSession(callbacks);
}, 200);
return;
}
callbacks.error("Error connecting to the Janus WebSockets server: Is the server down?");
},
'open': function() {
// We need to be notified about the success
transactions[transaction] = function(json) {
Janus.debug(json);
if (json["janus"] !== "success") {
Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason); // FIXME
callbacks.error(json["error"].reason);
return;
}
wsKeepaliveTimeoutId = setTimeout(keepAlive, keepAlivePeriod);
connected = true;
sessionId = json["session_id"] ? json["session_id"] : json.data["id"];
if(callbacks["reconnect"]) {
Janus.log("Claimed session: " + sessionId);
} else {
Janus.log("Created session: " + sessionId);
}
Janus.sessions[sessionId] = that;
callbacks.success();
};
ws.send(JSON.stringify(request));
},
'message': function(event) {
handleEvent(JSON.parse(event.data));
},
'close': function() {
if (!server || !connected) {
return;
}
connected = false;
// FIXME What if this is called when the page is closed?
gatewayCallbacks.error("Lost connection to the server (is it down?)");
}
};
for(var eventName in wsHandlers) {
ws.addEventListener(eventName, wsHandlers[eventName]);
}
return;
}
Janus.httpAPICall(server, {
verb: 'POST',
withCredentials: withCredentials,
body: request,
success: function(json) {
Janus.debug(json);
if(json["janus"] !== "success") {
Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason); // FIXME
callbacks.error(json["error"].reason);
return;
}
connected = true;
sessionId = json["session_id"] ? json["session_id"] : json.data["id"];
if(callbacks["reconnect"]) {
Janus.log("Claimed session: " + sessionId);
} else {
Janus.log("Created session: " + sessionId);
}
Janus.sessions[sessionId] = that;
eventHandler();
callbacks.success();
},
error: function(textStatus, errorThrown) {
Janus.error(textStatus + ":", errorThrown); // FIXME
if(Janus.isArray(servers) && !callbacks["reconnect"]) {
serversIndex++;
if(serversIndex === servers.length) {
// We tried all the servers the user gave us and they all failed
callbacks.error("Error connecting to any of the provided Janus servers: Is the server down?");
return;
}
// Let's try the next server
server = null;
setTimeout(function() { createSession(callbacks); }, 200);
return;
}
if(errorThrown === "")
callbacks.error(textStatus + ": Is the server down?");
else
callbacks.error(textStatus + ": " + errorThrown);
}
});
}
// Private method to get info on the server
function getInfo(callbacks) {
callbacks = callbacks || {};
// FIXME This method triggers a success even when we fail
callbacks.success = (typeof callbacks.success == "function") ? callbacks.success : Janus.noop;
callbacks.error = (typeof callbacks.error == "function") ? callbacks.error : Janus.noop;
Janus.log("Getting info on Janus instance");
if(!connected) {
Janus.warn("Is the server down? (connected=false)");
callbacks.error("Is the server down? (connected=false)");
return;
}
// We just need to send an "info" request
var transaction = Janus.randomString(12);
var request = { "janus": "info", "transaction": transaction };
if(token)
request["token"] = token;
if(apisecret)
request["apisecret"] = apisecret;
if(websockets) {
transactions[transaction] = function(json) {
Janus.log("Server info:");
Janus.debug(json);
if(json["janus"] !== "server_info") {
Janus.error("Ooops: " + json["error"].code + " " + json["error"].reason); // FIXME