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index.js
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index.js
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var util = require('util');
var intersect = require('intersect');
var WildEmitter = require('wildemitter');
var BaseSession = require('jingle-session');
var MediaSession = require('jingle-media-session');
var FileSession = require('jingle-filetransfer-session');
function SessionManager(conf) {
WildEmitter.call(this);
conf = conf || {};
this.jid = conf.jid;
this.selfID = conf.selfID || (this.jid && this.jid.full) || this.jid || '';
this.sessions = {};
this.peers = {};
this.prepareSession = conf.prepareSession || function (opts) {
if (opts.applicationTypes.indexOf('rtp') >= 0) {
return new MediaSession(opts);
}
if (opts.applicationTypes.indexOf('filetransfer') >= 0) {
return new FileSession(opts);
}
};
this.performTieBreak = conf.performTieBreak || function (sess, req) {
var applicationTypes= req.jingle.contents.map(function (content) {
if (content.application) {
return content.application.applicationType;
}
});
var matching = intersect(sess.pendingApplicationTypes, applicationTypes);
return matching.length > 0;
};
this.config = {
debug: false,
peerConnectionConfig: {
iceServers: conf.iceServers || [{'urls': 'stun:stun.l.google.com:19302'}]
},
peerConnectionConstraints: {
optional: [
{DtlsSrtpKeyAgreement: true},
{RtpDataChannels: false}
]
},
media: {
audio: true,
video: true
}
};
for (var item in conf) {
this.config[item] = conf[item];
}
this.iceServers = this.config.peerConnectionConfig.iceServers;
}
util.inherits(SessionManager, WildEmitter);
SessionManager.prototype.addICEServer = function (server) {
// server == {
// url: '',
// [username: '',]
// [credential: '']
// }
if (typeof server === 'string') {
server = {urls: server};
}
this.iceServers.push(server);
};
SessionManager.prototype.addSession = function (session) {
var self = this;
var sid = session.sid;
var peer = session.peerID;
this.sessions[sid] = session;
if (!this.peers[peer]) {
this.peers[peer] = [];
}
this.peers[peer].push(session);
// Automatically clean up tracked sessions
session.on('terminated', function () {
var peers = self.peers[peer] || [];
if (peers.length) {
peers.splice(peers.indexOf(session), 1);
}
delete self.sessions[sid];
});
// Proxy session events
session.on('*', function (name, data, extraData, extraData2) {
// Listen for when we actually try to start a session to
// trigger the outgoing event.
if (name === 'send') {
var action = data.jingle && data.jingle.action;
if (session.isInitiator && action === 'session-initiate') {
self.emit('outgoing', session);
}
}
if (self.config.debug && (name === 'log:debug' || name === 'log:error')) {
console.log('Jingle:', data, extraData, extraData2);
}
// Don't proxy change:* events, since those don't apply to
// the session manager itself.
if (name.indexOf('change') === 0) {
return;
}
self.emit(name, data, extraData, extraData2);
});
this.emit('createdSession', session);
return session;
};
SessionManager.prototype.createMediaSession = function (peer, sid, stream) {
var session = new MediaSession({
sid: sid,
peer: peer,
initiator: true,
stream: stream,
parent: this,
iceServers: this.iceServers,
constraints: this.config.peerConnectionConstraints
});
this.addSession(session);
return session;
};
SessionManager.prototype.createFileTransferSession = function (peer, sid) {
var session = new FileSession({
sid: sid,
peer: peer,
initiator: true,
parent: this,
iceServers: this.iceServers
});
this.addSession(session);
return session;
};
SessionManager.prototype.endPeerSessions = function (peer, reason, silent) {
peer = peer.full || peer;
var sessions = this.peers[peer] || [];
delete this.peers[peer];
sessions.forEach(function (session) {
session.end(reason || 'gone', silent);
});
};
SessionManager.prototype.endAllSessions = function (reason, silent) {
var self = this;
Object.keys(this.peers).forEach(function (peer) {
self.endPeerSessions(peer, reason, silent);
});
};
SessionManager.prototype._createIncomingSession = function (meta, req) {
var session;
if (this.prepareSession) {
session = this.prepareSession(meta, req);
}
// Fallback to a generic session type, which can
// only be used to end the session.
if (!session) {
session = new BaseSession(meta);
}
this.addSession(session);
return session;
};
SessionManager.prototype._sendError = function (to, id, data) {
if (!data.type) {
data.type = 'cancel';
}
this.emit('send', {
to: to,
id: id,
type: 'error',
error: data
});
};
SessionManager.prototype._log = function (level, message) {
this.emit('log:' + level, message);
};
SessionManager.prototype.process = function (req) {
var self = this;
// Extract the request metadata that we need to verify
var sid = !!req.jingle ? req.jingle.sid : null;
var session = this.sessions[sid] || null;
var rid = req.id;
var sender = req.from.full || req.from;
if (req.type === 'error') {
var isTieBreak = req.error && req.error.jingleCondition === 'tie-break';
if (session && session.pending && isTieBreak) {
return session.end('alternative-session', true);
} else {
if (session) {
session.pendingAction = false;
}
return this.emit('error', req);
}
}
if (req.type === 'result') {
if (session) {
session.pendingAction = false;
}
return;
}
var action = req.jingle.action;
var contents = req.jingle.contents || [];
var applicationTypes = contents.map(function (content) {
if (content.application) {
return content.application.applicationType;
}
});
var transportTypes = contents.map(function (content) {
if (content.transport) {
return content.transport.transportType;
}
});
// Now verify that we are allowed to actually process the
// requested action
if (action !== 'session-initiate') {
// Can't modify a session that we don't have.
if (!session) {
this._log('error', 'Unknown session', sid);
return this._sendError(sender, rid, {
condition: 'item-not-found',
jingleCondition: 'unknown-session'
});
}
// Check if someone is trying to hijack a session.
if (session.peerID !== sender || session.ended) {
this._log('error', 'Session has ended, or action has wrong sender');
return this._sendError(sender, rid, {
condition: 'item-not-found',
jingleCondition: 'unknown-session'
});
}
// Can't accept a session twice
if (action === 'session-accept' && !session.pending) {
this._log('error', 'Tried to accept session twice', sid);
return this._sendError(sender, rid, {
condition: 'unexpected-request',
jingleCondition: 'out-of-order'
});
}
// Can't process two requests at once, need to tie break
if (action !== 'session-terminate' && action === session.pendingAction) {
this._log('error', 'Tie break during pending request');
if (session.isInitiator) {
return this._sendError(sender, rid, {
condition: 'conflict',
jingleCondition: 'tie-break'
});
}
}
} else if (session) {
// Don't accept a new session if we already have one.
if (session.peerID !== sender) {
this._log('error', 'Duplicate sid from new sender');
return this._sendError(sender, rid, {
condition: 'service-unavailable'
});
}
// Check if we need to have a tie breaker because both parties
// happened to pick the same random sid.
if (session.pending) {
if (this.selfID > session.peerID && this.performTieBreak(session, req)) {
this._log('error', 'Tie break new session because of duplicate sids');
return this._sendError(sender, rid, {
condition: 'conflict',
jingleCondition: 'tie-break'
});
}
} else {
// The other side is just doing it wrong.
this._log('error', 'Someone is doing this wrong');
return this._sendError(sender, rid, {
condition: 'unexpected-request',
jingleCondition: 'out-of-order'
});
}
} else if (this.peers[sender] && this.peers[sender].length) {
// Check if we need to have a tie breaker because we already have
// a different session with this peer that is using the requested
// content application types.
for (var i = 0, len = this.peers[sender].length; i < len; i++) {
var sess = this.peers[sender][i];
if (sess && sess.pending && sess.sid > sid && this.performTieBreak(sess, req)) {
this._log('info', 'Tie break session-initiate');
return this._sendError(sender, rid, {
condition: 'conflict',
jingleCondition: 'tie-break'
});
}
}
}
// We've now weeded out invalid requests, so we can process the action now.
if (action === 'session-initiate') {
if (!contents.length) {
return self._sendError(sender, rid, {
condition: 'bad-request'
});
}
session = this._createIncomingSession({
sid: sid,
peer: req.from,
peerID: sender,
initiator: false,
parent: this,
applicationTypes: applicationTypes,
transportTypes: transportTypes,
iceServers: this.iceServers,
constraints: this.config.peerConnectionConstraints
}, req);
}
session.process(action, req.jingle, function (err) {
if (err) {
self._log('error', 'Could not process request', req, err);
self._sendError(sender, rid, err);
} else {
self.emit('send', {
to: sender,
id: rid,
type: 'result',
});
// Wait for the initial action to be processed before emitting
// the session for the user to accept/reject.
if (action === 'session-initiate') {
self.emit('incoming', session);
}
}
});
};
module.exports = SessionManager;