forked from localtunnel/server
/
server.js
249 lines (193 loc) · 6.05 KB
/
server.js
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var log = require('bookrc');
var express = require('express');
var bouncy = require('bouncy');
var taters = require('taters');
var enchilada = require('enchilada');
var stylish = require('stylish');
var makeover = require('makeover');
var makeup = require('makeup');
var engine = require('engine.io');
var browserkthx = require('browserkthx');
var debug = require('debug')('localtunnel-server');
var Proxy = require('./proxy');
var rand_id = require('./lib/rand_id');
var kProduction = process.env.NODE_ENV === 'production';
// id -> client http server
var clients = {};
// proxy statistics
var stats = {
requests: 0,
waiting: 0,
tunnels: 0,
};
function maybe_bounce(req, res, bounce) {
// without a hostname, we won't know who the request is for
var hostname = req.headers.host;
if (!hostname) {
return false;
}
var match = hostname.match(/^([a-z0-9]{4,10})[.].*/);
// not for a specific client
// pass on to regular server
if (!match) {
return false;
}
var client_id = match[1];
var client = clients[client_id];
// no such subdomain
// we use 502 error to the client to signify we can't service the request
if (!client) {
res.statusCode = 502;
res.end('localtunnel error: no active client for \'' + client_id + '\'');
return true;
}
++stats.requests;
res.once('close', function() {
--stats.requests;
});
// get client port
client.next_socket(function(socket, done) {
// happens when client upstream is disconnected
// we gracefully inform the user and kill their conn
// without this, the browser will leave some connections open
// and try to use them again for new requests
// we cannot have this as we need bouncy to assign the requests again
if (!socket) {
res.statusCode = 504;
res.end();
req.connection.destroy();
return;
}
var stream = bounce(socket, { headers: { connection: 'close' } });
stream.on('error', function(err) {
socket.destroy();
});
// return the socket to the client pool
stream.once('end', function() {
done();
});
});
return true;
}
function new_client(id, opt, cb) {
// can't ask for id already is use
// TODO check this new id again
if (clients[id]) {
id = rand_id();
}
var popt = {
id: id,
max_tcp_sockets: opt.max_tcp_sockets
};
var client = Proxy(popt, function(err, info) {
if (err) {
return cb(err);
}
++stats.tunnels;
clients[id] = client;
info.id = id;
cb(err, info);
});
client.on('end', function() {
--stats.tunnels;
delete clients[id];
});
}
module.exports = function(opt) {
opt = opt || {};
var schema = opt.secure ? 'https' : 'http';
var app = express();
app.set('view engine', 'html');
app.set('views', __dirname + '/views');
app.engine('html', require('hbs').__express);
app.use(express.favicon());
app.use(browserkthx({ ie: '< 9' }));
app.use(taters({ cache: kProduction }));
app.use(stylish({
src: __dirname + '/static/',
compress: kProduction,
cache: kProduction,
setup: function(stylus) {
return stylus.use(makeover());
}
}));
app.use(enchilada({
src: __dirname + '/static/',
compress: kProduction,
cache: kProduction
}));
app.use('/css/widgets.css', makeup(__dirname + '/static/css/widgets.css'));
app.use(express.static(__dirname + '/static'));
app.use(app.router);
app.get('/', function(req, res, next) {
if (req.query['new'] === undefined) {
return next();
}
var req_id = rand_id();
debug('making new client with id %s', req_id);
new_client(req_id, opt, function(err, info) {
if (err) {
res.statusCode = 500;
return res.end(err.message);
}
var url = schema + '://' + req_id + '.' + req.headers.host;
info.url = url;
res.end(JSON.stringify(info));
});
});
app.get('/', function(req, res, next) {
return res.render('index');
});
app.get('/:req_id', function(req, res, next) {
var req_id = req.param('req_id');
if (! /[A-Za-z0-9]{4,10}/.test(req_id)) {
return next();
}
debug('making new client with id %s', req_id);
new_client(req_id, opt, function(err, info) {
if (err) {
res.statusCode = 500;
return res.end(err.message);
}
var url = schema + '://' + req_id + '.' + req.headers.host;
info.url = url;
res.end(JSON.stringify(info));
});
});
var app_port = 0;
var app_server = app.listen(app_port, function() {
app_port = app_server.address().port;
});
// connected engine.io sockets for stats updates
var eio_sockets = [];
setInterval(function() {
eio_sockets.forEach(function(socket) {
socket.send(JSON.stringify(stats));
});
}, 1000);
var eio_server = engine.attach(app_server);
eio_server.on('connection', function (socket) {
eio_sockets.push(socket);
socket.send(JSON.stringify(stats));
socket.on('error', function(err) {
log.error(err);
socket.close();
});
socket.on('close', function() {
// remove from socket pool so no more updates are sent
var idx = eio_sockets.indexOf(socket);
if (idx >= 0) {
eio_sockets.splice(idx, 1);
}
});
});
var server = bouncy(function(req, res, bounce) {
debug('request %s', req.url);
// if we should bounce this request, then don't send to our server
if (maybe_bounce(req, res, bounce)) {
return;
};
bounce(app_port);
});
return server;
};