index.js
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/**
* Module dependencies.
*/
var http = require('http');
var read = require('fs').readFileSync;
var engine = require('engine.io');
var client = require('socket.io-client');
var clientVersion = require('socket.io-client/package').version;
var Client = require('./client');
var Namespace = require('./namespace');
var Adapter = require('socket.io-adapter');
var debug = require('debug')('socket.io:server');
var url = require('url');
/**
* Module exports.
*/
module.exports = Server;
/**
* Socket.IO client source.
*/
var clientSource = read(require.resolve('socket.io-client/socket.io.js'), 'utf-8');
/**
* Server constructor.
*
* @param {http.Server|Number|Object} srv http server, port or options
* @param {Object} opts
* @api public
*/
function Server(srv, opts){
if (!(this instanceof Server)) return new Server(srv, opts);
if ('object' == typeof srv && !srv.listen) {
opts = srv;
srv = null;
}
opts = opts || {};
this.nsps = {};
this.path(opts.path || '/socket.io');
this.serveClient(false !== opts.serveClient);
this.adapter(opts.adapter || Adapter);
this.origins(opts.origins || '*:*');
this.sockets = this.of('/');
if (srv) this.attach(srv, opts);
}
/**
* Server request verification function, that checks for allowed origins
*
* @param {http.IncomingMessage} req request
* @param {Function} fn callback to be called with the result: `fn(err, success)`
*/
Server.prototype.checkRequest = function(req, fn) {
var origin = req.headers.origin || req.headers.referer;
// file:// URLs produce a null Origin which can't be authorized via echo-back
if ('null' == origin || null == origin) origin = '*';
if (!!origin && typeof(this._origins) == 'function') return this._origins(origin, fn);
if (this._origins.indexOf('*:*') !== -1) return fn(null, true);
if (origin) {
try {
var parts = url.parse(origin);
var defaultPort = 'https:' == parts.protocol ? 443 : 80;
parts.port = parts.port != null
? parts.port
: defaultPort;
var ok =
~this._origins.indexOf(parts.hostname + ':' + parts.port) ||
~this._origins.indexOf(parts.hostname + ':*') ||
~this._origins.indexOf('*:' + parts.port);
return fn(null, !!ok);
} catch (ex) {
}
}
fn(null, false);
};
/**
* Sets/gets whether client code is being served.
*
* @param {Boolean} v whether to serve client code
* @return {Server|Boolean} self when setting or value when getting
* @api public
*/
Server.prototype.serveClient = function(v){
if (!arguments.length) return this._serveClient;
this._serveClient = v;
return this;
};
/**
* Old settings for backwards compatibility
*/
var oldSettings = {
"transports": "transports",
"heartbeat timeout": "pingTimeout",
"heartbeat interval": "pingInterval",
"destroy buffer size": "maxHttpBufferSize"
};
/**
* Backwards compatiblity.
*
* @api public
*/
Server.prototype.set = function(key, val){
if ('authorization' == key && val) {
this.use(function(socket, next) {
val(socket.request, function(err, authorized) {
if (err) return next(new Error(err));
if (!authorized) return next(new Error('Not authorized'));
next();
});
});
} else if ('origins' == key && val) {
this.origins(val);
} else if ('resource' == key) {
this.path(val);
} else if (oldSettings[key] && this.eio[oldSettings[key]]) {
this.eio[oldSettings[key]] = val;
} else {
console.error('Option %s is not valid. Please refer to the README.', key);
}
return this;
};
/**
* Sets the client serving path.
*
* @param {String} v pathname
* @return {Server|String} self when setting or value when getting
* @api public
*/
Server.prototype.path = function(v){
if (!arguments.length) return this._path;
this._path = v.replace(/\/$/, '');
return this;
};
/**
* Sets the adapter for rooms.
*
* @param {Adapter} v pathname
* @return {Server|Adapter} self when setting or value when getting
* @api public
*/
Server.prototype.adapter = function(v){
if (!arguments.length) return this._adapter;
this._adapter = v;
for (var i in this.nsps) {
if (this.nsps.hasOwnProperty(i)) {
this.nsps[i].initAdapter();
}
}
return this;
};
/**
* Sets the allowed origins for requests.
*
* @param {String} v origins
* @return {Server|Adapter} self when setting or value when getting
* @api public
*/
Server.prototype.origins = function(v){
if (!arguments.length) return this._origins;
this._origins = v;
return this;
};
/**
* Attaches socket.io to a server or port.
*
* @param {http.Server|Number} server or port
* @param {Object} options passed to engine.io
* @return {Server} self
* @api public
*/
Server.prototype.listen =
Server.prototype.attach = function(srv, opts){
if ('function' == typeof srv) {
var msg = 'You are trying to attach socket.io to an express ' +
'request handler function. Please pass a http.Server instance.';
throw new Error(msg);
}
// handle a port as a string
if (Number(srv) == srv) {
srv = Number(srv);
}
if ('number' == typeof srv) {
debug('creating http server and binding to %d', srv);
var port = srv;
srv = http.Server(function(req, res){
res.writeHead(404);
res.end();
});
srv.listen(port);
}
// set engine.io path to `/socket.io`
opts = opts || {};
opts.path = opts.path || this.path();
// set origins verification
opts.allowRequest = opts.allowRequest || this.checkRequest.bind(this);
// initialize engine
debug('creating engine.io instance with opts %j', opts);
this.eio = engine.attach(srv, opts);
// attach static file serving
if (this._serveClient) this.attachServe(srv);
// Export http server
this.httpServer = srv;
// bind to engine events
this.bind(this.eio);
return this;
};
/**
* Attaches the static file serving.
*
* @param {Function|http.Server} srv http server
* @api private
*/
Server.prototype.attachServe = function(srv){
debug('attaching client serving req handler');
var url = this._path + '/socket.io.js';
var evs = srv.listeners('request').slice(0);
var self = this;
srv.removeAllListeners('request');
srv.on('request', function(req, res) {
if (0 === req.url.indexOf(url)) {
self.serve(req, res);
} else {
for (var i = 0; i < evs.length; i++) {
evs[i].call(srv, req, res);
}
}
});
};
/**
* Handles a request serving `/socket.io.js`
*
* @param {http.Request} req
* @param {http.Response} res
* @api private
*/
Server.prototype.serve = function(req, res){
var etag = req.headers['if-none-match'];
if (etag) {
if (clientVersion == etag) {
debug('serve client 304');
res.writeHead(304);
res.end();
return;
}
}
debug('serve client source');
res.setHeader('Content-Type', 'application/javascript');
res.setHeader('ETag', clientVersion);
res.writeHead(200);
res.end(clientSource);
};
/**
* Binds socket.io to an engine.io instance.
*
* @param {engine.Server} engine engine.io (or compatible) server
* @return {Server} self
* @api public
*/
Server.prototype.bind = function(engine){
this.engine = engine;
this.engine.on('connection', this.onconnection.bind(this));
return this;
};
/**
* Called with each incoming transport connection.
*
* @param {engine.Socket} conn
* @return {Server} self
* @api public
*/
Server.prototype.onconnection = function(conn){
debug('incoming connection with id %s', conn.id);
var client = new Client(this, conn);
client.connect('/');
return this;
};
/**
* Looks up a namespace.
*
* @param {String} name nsp name
* @param {Function} fn optional, nsp `connection` ev handler
* @api public
*/
Server.prototype.of = function(name, fn){
if (String(name)[0] !== '/') name = '/' + name;
var nsp = this.nsps[name];
if (!nsp) {
debug('initializing namespace %s', name);
nsp = new Namespace(this, name);
this.nsps[name] = nsp;
}
if (fn) nsp.on('connect', fn);
return nsp;
};
/**
* Closes server connection
*
* @api public
*/
Server.prototype.close = function(){
for (var id in this.nsps['/'].sockets) {
if (this.nsps['/'].sockets.hasOwnProperty(id)) {
this.nsps['/'].sockets[id].onclose();
}
}
this.engine.close();
if(this.httpServer){
this.httpServer.close();
}
};
/**
* Expose main namespace (/).
*/
['on', 'to', 'in', 'use', 'emit', 'send', 'write', 'clients', 'compress'].forEach(function(fn){
Server.prototype[fn] = function(){
var nsp = this.sockets[fn];
return nsp.apply(this.sockets, arguments);
};
});
Namespace.flags.forEach(function(flag){
Server.prototype.__defineGetter__(flag, function(){
this.sockets.flags = this.sockets.flags || {};
this.sockets.flags[flag] = true;
return this;
});
});
/**
* BC with `io.listen`
*/
Server.listen = Server;