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proxy.js
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proxy.js
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// Copyright (c) 2013 Tom Zhou<appnet.link@gmail.com>
var eventEmitter = require('events').EventEmitter,
util = require('util'),
WEBPP = require('appnet.io'),
SEP = WEBPP.SEP,
vURL = WEBPP.vURL,
URL = require('url'),
NET = require('net'),
httppProxy = require('httpp-proxy'),
zlib = require('zlib'),
Buffer = require('buffer').Buffer,
Iconv = require('iconv-lite'),
Jschardet = require('jschardet'),
Connect = require('connect');
// helpers
function isLocalhost(host){
return ((host === 'localhost') || (host === '127.0.0.1') ||
(host === '0:0:0:0:0:0:0:1') || (host === '::1'));
}
// vHost-based STUN proxy vURL like sxxxp-vlocal.
// TBD... chained proxy
///var vsperegex = /s([0-9]|[a-f]){32}p/gi;
var vhostspregex = /(s([0-9]|[a-f]){32}p-)*vlocal\./gi;
// vPath-based STUN proxy vURL like /vlocal-sxxxp
///var vpathspregex = /\/vlocal(-s([0-9]|[a-f]){32}p)*/gi;
// Debug level
var Debug = 0;
// Proxy class
// a proxy will contain one appnet.io name-client
// - options: user custom parameters, like {secmode: ..., usrkey: ..., domain: ..., endpoints: ..., turn: ...}
// - options.secmode: ssl, enable ssl/https; acl, enable ssl/https,host-based ACL
// - options.https: true or false, true for https proxy server, false for http proxy server
// - fn: callback to pass proxy informations
var Proxy = module.exports = function(options, fn){
var self = this;
if (!(this instanceof Proxy)) return new Proxy(options, fn);
// super constructor
eventEmitter.call(self);
if (typeof options == 'function') {
fn = options;
options = {};
}
options.https = options.https || true;
// 0.
// proxy cache
self.webProxyCache = self.webProxyCache || {};
// 1.
// create name client
var nmcln = self.nmcln = new WEBPP({
usrinfo: {
domain: (options && options.domain) || '51dese.com',
usrkey: (options && options.usrkey) || ('stun-proxy@'+Date.now())
},
srvinfo: {
timeout: 20,
endpoints: (options && options.endpoints) || [
{ip: '51dese.com', port: 51686},
{ip: '51dese.com', port: 51868}
],
turn: (options && options.turn) || [
{ip: '51dese.com', agent: 51866, proxy: 51688}
]
},
// vURL mode: vpath-based
vmode: vURL.URL_MODE_PATH,
// secure mode
secmode: (options && options.secmode === 'ssl') ? SEP.SEP_SEC_SSL : SEP.SEP_SEC_SSL_ACL_HOST
});
// 2.
// check ready
nmcln.once('ready', function(){
// http proxy
function httpxy(req, res, next) {
var vurle, vstrs, hoste = req.headers.host, urle = req.url;
// 1.
// match vURL pattern:
// - vhost like http(s)://"xxx.vurl."vlocal.51dese.com
// - vpath like http(s)://vlocal.51dese.com"/vurl/xxx"
if (vstrs = req.headers.host.match(vURL.regex_vhost)) {
vurle = vstrs[0];
if (Debug) console.log('proxy for client with vhost:'+vurle);
} else if (vstrs = req.url.match(vURL.regex_vpath)) {
vurle = vstrs[0];
// prune vpath in req.url
req.url = req.url.replace(vurle, '');
// prune /vlocal/sxxxp path
// TBD ... cascade routing
///req.url = req.url.replace(vpathspregex, '');
if (Debug) console.log('proxy for client with vpath:'+vurle);
} else {
// invalid vURL
console.error('invalid URL:'+urle);
next();
return;
}
if (Debug) console.log('Http request proxy for client request.headers:'+JSON.stringify(req.headers)+
',url:'+urle+',vurl:'+vurle);
// 1.1
// check vURL if STUNable
// TBD ...
// 1.2
// !!! rewrite req.url to remove vToken parts
// TBD ... vToken check
req.url = req.url.replace(vURL.regex_vtoken, '');
// 1.3
// remove vlocal. subdomain
req.headers.host = req.headers.host.replace(vhostspregex, '');
// 2.
// get peer info by vURL
nmcln.getvURLInfo(vurle, function(err, routing){
// 2.1
// check error and authentication
if (err || !routing) {
// invalid vURL
res.writeHead(400);
res.end('invalid URL');
console.error('invalid URL:'+urle);
// invalide proxy cache
if (self.webProxyCache[vurle])
self.webProxyCache[vurle] = null;
return;
} else {
// 3.
// create proxy instance and cache it
if (!self.webProxyCache[vurle]) {
// fill routing info and create proxy to peer target
var dstip, dstport;
if ((nmcln.oipaddr === routing.dst.ipaddr) ||
(isLocalhost(nmcln.oipaddr) && isLocalhost(routing.dst.ipaddr))) {
dstip = routing.dst.lipaddr;
dstport = routing.dst.lport;
} else {
dstip = routing.dst.ipaddr;
dstport = routing.dst.port;
}
self.webProxyCache[vurle] = new httppProxy.HttpProxy({
https: options.https || false,
changeOrigin: false,
enable: {xforward: true},
target: {
httpp: true,
// set SSL related info
https: routing.secmode ? {
rejectUnauthorized: nmcln.secerts && nmcln.secerts.rejectUnauthorized,
ca: nmcln.secerts && nmcln.secerts.ca,
key: nmcln.secerts && nmcln.secerts.key,
cert: nmcln.secerts && nmcln.secerts.cert
} : false,
host: dstip,
port: dstport,
// set user-specific feature,like maxim bandwidth,etc
localAddress: {
addr: nmcln.ipaddr,
port: nmcln.port,
opt: {
mbw: options.mbw || null
}
}
}
});
// 3.1
// Handle request error
self.webProxyCache[vurle].on('proxyError', function(err, req, res){
if (Debug) console.error(err+',proxy to '+urle);
// send error back
try {
res.writeHead(500, {'Content-Type': 'text/plain'});
if (req.method !== 'HEAD') {
if (process.env.NODE_ENV === 'production') {
res.write('Internal Server Error');
} else {
res.write('An error has occurred: ' + JSON.stringify(err));
}
}
res.end();
} catch (ex) {
console.error("res.end error: %s", ex.message) ;
}
// clear vURL entry
self.webProxyCache[vurle] = null;
});
// 3.2
// Handle upgrade error
self.webProxyCache[vurle].on('webSocketProxyError', function(err, req, socket, head){
if (Debug) console.error(err+',proxy to '+urle);
// send error back
try {
if (process.env.NODE_ENV === 'production') {
socket.write('Internal Server Error');
} else {
socket.write('An error has occurred: ' + JSON.stringify(err));
}
socket.end();
} catch (ex) {
console.error("socket.end error: %s", ex.message) ;
}
// clear vURL entry
self.webProxyCache[vurle] = null;
});
// Handle custom rewrite logics on response for reverse proxy
//--> custom rewrite logics ///////////////////////////////////////
self.webProxyCache[vurle].on('proxyResponse', function(req, res, response){
var prxself = this;
if (Debug) console.log('Proxy response,'+'req.headers:'+JSON.stringify(req.headers)+
'\n\n,response.statusCode:'+response.statusCode+',response.headers:'+JSON.stringify(response.headers));
// 3.3
// rewrite href from 2XX text/html response for whole website proxy
if ((response.statusCode >= 200 && response.statusCode < 300) &&
('content-type' in response.headers) &&
(response.headers['content-type'].match('text/html') ||
response.headers['content-type'].match('text/xml'))) {
if (Debug) console.log('Proxy 200 response,'+'response.headers:'+JSON.stringify(response.headers));
// 3.3.0
// rewrite Content-Location in response
if (response.headers['content-location']) {
// - rewrite vhref host part by embedded 'sxxxp.vlocal.'
// - rewrite vhref path part by embedded '/vlocal/sxxxp'
response.headers['content-location'] = response.headers['content-location'].replace(vURL.regex_url, function(href){
if (href.match(vURL.regex_vhost) && !(href.match(vhostspregex))) {
// calculate replaced string
return href.replace(vURL.regex_vhost, function(vhost){
///var vhoste = vhost.match(vURL.regex_vurle)[0];
///return vhost+'s'+vhoste+'p'+'.vlocal.';
return vhost+'vlocal.';
});
} else if (href.match(vURL.regex_vpath) /*&& !(href.match(vpathspregex))*/) {
// append vlocal. subdomain
if (!(/^(https?:\/\/vlocal\.)/gi).test(href)) {
href = href.replace(/^(https?:\/\/)/gi, href.match(/^(https?:\/\/)/gi)[0]+'vlocal.');
}
return href;
// calculate replaced string
/*
return href.replace(vURL.regex_vpath, function(vpath){
var vpathe = vpath.match(vURL.regex_vurle)[0];
return vpath+'/vlocal/'+'s'+vpathe+'p';
});*/
} else {
return href;
}
});
}
// 3.3.1
// intercept res.writeHead, res.write and res.end
// notes:
// - unzip and zip again
// - ...
var reshed = {};
var resbuf = [];
var ressiz = 0;
var resstr = '';
var _res_write = res.write, _res_end = res.end, _res_writeHead = res.writeHead;
var _decomp, _encomp, _codec;
// 3.1.1
// overwrite res.writeHead by cache statusCode
res.writeHead = function(statusCode, reasonPhrase, headers) {
reshed.statusCode = statusCode;
reshed.headers = {};
if (typeof reasonPhrase === 'object') {
reshed.headers = reasonPhrase;
} else if (typeof headers === 'object') {
reshed.headers = headers;
}
Object.keys(reshed.headers).forEach(function (key) {
res.setHeader(key, reshed.headers[key]);
});
};
// 3.3.2
// handle compressed text
if (('content-encoding' in response.headers) &&
(response.headers['content-encoding'].match('gzip') ||
response.headers['content-encoding'].match('deflate'))) {
if (Debug) console.log('Proxy ziped response,'+'response.headers:'+JSON.stringify(response.headers));
if (response.headers['content-encoding'].match('gzip')) {
_codec = 'gzip';
_decomp = zlib.createGunzip();
_encomp = zlib.createGzip();
} else {
_codec = 'deflate';
_decomp = zlib.createInflate();
_encomp = zlib.createDeflate();
}
if (Debug) console.log('\n\ngzip');
// 3.3.2.1
// override res.write and res.end
res.write = function(trunk){
return _decomp.write(trunk);
};
res.end = function(trunk){
_decomp.end(trunk);
};
// 3.3.3
// in case handle Node.js-not-supported charset
// - detect charset
// - decode content by charset
// - rewrite resstr
// - send rewrote resstr by charset
// - force response on utf-8 charset??? TBD...
_decomp.on('data', function(text) {
if (text) {
resbuf.push(text);
ressiz += text.length;
}
});
_decomp.on('end', function() {
// 3.3.3.1
// concat big buffer
var bigbuf = Buffer.concat(resbuf, ressiz);
// 3.3.3.2
// detect charset
var chardet = Jschardet.detect(bigbuf);
var charset = chardet.encoding;
if (Debug) console.log('charset:'+JSON.stringify(chardet));
// 3.3.3.3
// decode content by charset
resstr = Iconv.decode(bigbuf, charset);
if (Debug > 1) console.log('text response:'+resstr);
// 3.3.3.4
// rewrite text content
///console.log('before rewrite:'+JSON.stringify(resstr.match(vURL.regex_url)));
// 3.3.3.4.1
// - rewrite vhref host part by embedded 'sxxxp.vlocal.'
// - rewrite vhref path part by embedded '/vlocal/sxxxp'
resstr = resstr.replace(vURL.regex_url, function(href){
if (href.match(vURL.regex_vhost) && !(href.match(vhostspregex))) {
// calculate replaced string
return href.replace(vURL.regex_vhost, function(vhost){
///var vhoste = vhost.match(vURL.regex_vurle)[0];
///return vhost+'s'+vhoste+'p'+'.vlocal.';
return vhost+'vlocal.';
});
} else if (href.match(vURL.regex_vpath) /*&& !(href.match(vpathspregex))*/) {
// append vlocal. subdomain
if (!(/^(https?:\/\/vlocal\.)/gi).test(href)) {
href = href.replace(/^(https?:\/\/)/gi, href.match(/^(https?:\/\/)/gi)[0]+'vlocal.');
}
return href;
// calculate replaced string
/*return href.replace(vURL.regex_vpath, function(vpath){
var vpathe = vpath.match(vURL.regex_vurle)[0];
return vpath+'/vlocal/'+'s'+vpathe+'p';
});*/
} else {
return href;
}
});
///console.log('after rewrite:'+JSON.stringify(resstr.match(vURL.regex_url)));
if (Debug > 1) console.log('overwrote text response:'+resstr);
// 3.3.3.5
// compress overwrote text and send out
if (_codec === 'gzip') {
var encbuf = Iconv.encode(resstr, charset);
// rewrite content-length
res.setHeader('content-length', encbuf.length);
res.writeHead = _res_writeHead;
res.writeHead(reshed.statusCode || 200);
zlib.gzip(encbuf, function(err, buffer) {
if (err) {
console.log(err+',deflate failed');
res.emit('error', err+',gzip failed');
} else {
res.write = _res_write;
res.end = _res_end;
res.end(buffer);
}
});
} else {
var encbuf = Iconv.encode(resstr, charset);
// rewrite content-length
res.setHeader('content-length', encbuf.length);
res.writeHead = _res_writeHead;
res.writeHead(reshed.statusCode || 200);
zlib.deflate(encbuf, function(err, buffer) {
if (!err) {
console.log(err+',deflate failed');
res.emit('error', err+',deflate failed');
} else {
res.write = _res_write;
res.end = _res_end;
res.end(buffer);
}
});
}
});
// 3.3.4
// decompress data
_decomp.on('drain', function(){
res.emit('drain');
});
} else {
if (Debug) console.log('\n\nnotzip');
// 3.3.5
// in case handle Node.js-not-supported charset
// - detect charset
// - decode content by charset
// - rewrite resstr
// - send rewrote by charset
// - force response on utf-8 charset??? TBD...
// 3.3.5.1
// override res.write and res.end
res.write = function(text){
if (text) {
resbuf.push(text);
ressiz += text.length;
}
return true;
};
res.end = function(text){
if (text) {
resbuf.push(text);
ressiz += text.length;
}
// 3.3.5.2
// concat big buffer
var bigbuf = Buffer.concat(resbuf, ressiz);
// 3.3.5.3
// detect charset
var chardet = Jschardet.detect(bigbuf);
var charset = chardet.encoding;
if (Debug) console.log('charset:'+JSON.stringify(chardet));
// 3.3.5.4
// decode content by charset
resstr = Iconv.decode(bigbuf, charset);
if (Debug > 1) console.log('text response:'+resstr);
// 3.3.5.5
// rewrite text content
///console.log('before rewrite:'+JSON.stringify(resstr.match(vURL.regex_url)));
// 3.3.5.5.1
// - rewrite vhref host part by embedded 'sxxxp.vlocal.'
// - rewrite vhref path part by embedded '/vlocal/sxxxp'
resstr = resstr.replace(vURL.regex_url, function(href){
if (href.match(vURL.regex_vhost) && !(href.match(vhostspregex))) {
// calculate replaced string
return href.replace(vURL.regex_vhost, function(vhost){
///var vhoste = vhost.match(vURL.regex_vurle)[0];
///return vhost+'s'+vhoste+'p'+'.vlocal.';
return vhost+'vlocal.';
});
} else if (href.match(vURL.regex_vpath) /*&& !(href.match(vpathspregex))*/) {
// append vlocal. subdomain
if (!(/^(https?:\/\/vlocal\.)/gi).test(href)) {
href = href.replace(/^(https?:\/\/)/gi, href.match(/^(https?:\/\/)/gi)[0]+'vlocal.');
}
return href;
// calculate replaced string
/*return href.replace(vURL.regex_vpath, function(vpath){
var vpathe = vpath.match(vURL.regex_vurle)[0];
return vpath+'/vlocal/'+'s'+vpathe+'p';
});*/
} else {
return href;
}
});
///console.log('after rewrite:'+JSON.stringify(resstr.match(vURL.regex_url)));
if (Debug > 1) console.log('overwrote text response:'+resstr);
// 3.3.6
// send overwrote text out
res.write = _res_write;
res.end = _res_end;
var encbuf = Iconv.encode(resstr, charset);
// rewrite content-length
res.setHeader('content-length', encbuf.length);
res.writeHead = _res_writeHead;
res.writeHead(reshed.statusCode || 200);
res.end(encbuf);
};
}
}
// 3.4.
// ...
// 3.5.
// rewrite 3XX redirection location by embedded 'sxxxp.vlocal.'
if ((response.statusCode >= 300 && response.statusCode < 400) &&
typeof response.headers.location !== 'undefined') {
response.headers.location = response.headers.location.replace(vURL.regex_url, function(href){
if (href.match(vURL.regex_vhost) && !(href.match(vhostspregex))) {
// calculate replaced string
return href.replace(vURL.regex_vhost, function(vhost){
///var vhoste = vhost.match(vURL.regex_vurle)[0];
///return vhost+'s'+vhoste+'p'+'.vlocal.';
return vhost+'vlocal.';
});
} else if (href.match(vURL.regex_vpath) /*&& !(href.match(vpathspregex))*/) {
// append vlocal. subdomain
if (!(/^(https?:\/\/vlocal\.)/gi).test(href)) {
href = href.replace(/^(https?:\/\/)/gi, href.match(/^(https?:\/\/)/gi)[0]+'vlocal.');
}
return href;
// calculate replaced string
/*return href.replace(vURL.regex_vpath, function(vpath){
var vpathe = vpath.match(vURL.regex_vurle)[0];
return vpath+'/vlocal/'+'s'+vpathe+'p';
});*/
} else {
return href;
}
});
}
});
//<-- custom rewrite logics ///////////////////////////////////////
}
// 5.
// traverse STUN session to peer
nmcln.trvsSTUN(vurle, function(err, stun){
if (err || !stun) {
// STUN not available, fall back to TURN
/*res.writeHead(400);
res.end('STUN not available, please use TURN');
console.error('STUN not available:'+urle);*/
res.writeHead(301, {'location': 'https://'+hoste.replace('vlocal.', '')+urle});
res.end();
console.log('fall back to TURN');
} else {
// 6.
// proxy target
// work-around first STUN setup hang by redirect
if (stun.firstrun) {
res.writeHead(301, {'location': urle});
res.end();
} else {
self.webProxyCache[vurle].proxyRequest(req, res);
}
}
});
}
});
}
// create connect App
var appHttp = Connect();
// hook http proxy
appHttp.use(httpxy);
// hook portal page
// TBD...
// websocket proxy
function wspxy(req, socket, head) {
var vurle, vstrs, hoste = req.headers.host, urle = req.url;
// 1.
// match vURL pattern:
// - vhost like http(s)://"xxx.vurl."vlocal.51dese.com
// - vpath like http(s)://vlocal.51dese.com"/vurl/xxx"
if (vstrs = req.headers.host.match(vURL.regex_vhost)) {
vurle = vstrs[0];
if (Debug) console.log('proxy for client with vhost:'+vurle);
} else if (vstrs = req.url.match(vURL.regex_vpath)) {
vurle = vstrs[0];
// prune vpath in req.url
req.url = req.url.replace(vurle, '');
// prune /vlocal/sxxxp path
// TBD ... cascade routing
///req.url = req.url.replace(vpathspregex, '');
if (Debug) console.log('proxy for client with vpath:'+vurle);
} else {
// invalid vURL
// MUST not close socket, which will break other upgrade listener
console.error('invalid URL:'+urle);
return;
}
if (Debug) console.log('Http request proxy for client request.headers:'+JSON.stringify(req.headers)+
',url:'+urle+',vurl:'+vurle);
// 1.1
// check vURL if STUNable
// TBD ...
// 1.2
// !!! rewrite req.url to remove vToken parts
// TBD ... vToken check
req.url = req.url.replace(vURL.regex_vtoken, '');
// 1.3
// remove vlocal. subdomain
req.headers.host = req.headers.host.replace(vhostspregex, '');
// 2.
// get peer info by vURL
nmcln.getvURLInfo(vurle, function(err, routing){
// 2.1
// check error and authentication
if (err || !routing) {
// invalid vURL
socket.end('invalid URL');
console.error('invalid URL:'+urle);
// invalide proxy cache
if (self.webProxyCache[vurle])
self.webProxyCache[vurle] = null;
return;
} else {
// 3.
// create proxy instance and cache it
if (!self.webProxyCache[vurle]) {
// fill routing info and create proxy to peer target
var dstip, dstport;
if ((nmcln.oipaddr === routing.dst.ipaddr) ||
(isLocalhost(nmcln.oipaddr) && isLocalhost(routing.dst.ipaddr))) {
dstip = routing.dst.lipaddr;
dstport = routing.dst.lport;
} else {
dstip = routing.dst.ipaddr;
dstport = routing.dst.port;
}
self.webProxyCache[vurle] = new httppProxy.HttpProxy({
https: options.https || false,
changeOrigin: false,
enable: {xforward: true},
target: {
httpp: true,
// set SSL related info
https: routing.secmode ? {
rejectUnauthorized: nmcln.secerts && nmcln.secerts.rejectUnauthorized,
ca: nmcln.secerts && nmcln.secerts.ca,
key: nmcln.secerts && nmcln.secerts.key,
cert: nmcln.secerts && nmcln.secerts.cert
} : false,
host: dstip,
port: dstport,
// set user-specific feature,like maxim bandwidth,etc
localAddress: {
addr: nmcln.ipaddr,
port: nmcln.port,
opt: {
mbw: options.mbw || null
}
}
}
});
// Handle request error
self.webProxyCache[vurle].on('proxyError', function(err, req, res){
if (Debug) console.error(err+',proxy to '+urle);
// send error back
try {
res.writeHead(500, {'Content-Type': 'text/plain'});
if (req.method !== 'HEAD') {
if (process.env.NODE_ENV === 'production') {
res.write('Internal Server Error');
} else {
res.write('An error has occurred: ' + JSON.stringify(err));
}
}
res.end();
} catch (ex) {
console.error("res.end error: %s", ex.message) ;
}
// clear vURL entry
self.webProxyCache[vurle] = null;
});
// Handle upgrade error
self.webProxyCache[vurle].on('webSocketProxyError', function(err, req, socket, head){
if (Debug) console.error(err+',proxy to '+urle);
// send error back
try {
if (process.env.NODE_ENV === 'production') {
socket.write('Internal Server Error');
} else {
socket.write('An error has occurred: ' + JSON.stringify(err));
}
socket.end();
} catch (ex) {
console.error("socket.end error: %s", ex.message) ;
}
// clear vURL entry
self.webProxyCache[vurle] = null;
});
//
}
// 5.
// traverse STUN session to peer
// notes: the step may needless because http proxy should did it
nmcln.trvsSTUN(vurle, function(err, stun){
if (err || !stun) {
// STUN not available, try to fall back to TURN
socket.end('STUN not available, please use TURN');
console.error('STUN not available:'+urle);
} else {
// 6.
// proxy target
self.webProxyCache[vurle].proxyWebSocketRequest(req, socket, head);
}
});
}
});
}
// 8.
// pass STUN proxy App
var papps = {httpApp: appHttp, wsApp: wspxy};
if (fn) fn(null, papps);
self.emit('ready', papps);
});
// 1.2
// check error
nmcln.on('error', function(err){
console.log('name-client create failed:'+JSON.stringify(err));
if (fn) fn(err);
self.emit('error', err);
});
};
util.inherits(Proxy, eventEmitter);