nodejs super proxy for CORS workaround

proxyme.js

console.log('DEV_SERVER.JS:STARTED');

var port = 3000;

var wsProxy = '$instance$.smxecho.com';
var wsPort = 8507;

var echoProxy = '$instance$.smxecho.com';
var echoPort = 8507;

// var wsProxy = 'localhost';
// var wsPort = 9000;

var config = require('./config').forBuild(process.argv.splice(2)[0]),
    compiler = require('./template-compiler'),
    path = require('path'),
    express = require('express'),
    http = require('http'),
    httpProxy = require('http-proxy'),
    url = require('url');
    

var server = express();
var proxy = new httpProxy.RoutingProxy();

// urls routes from config
config.urls.map(function(route) {
    server.get(
        route.url,
        function(req, res) {
            var html = compiler.render(config, route);
            res.set('Content-Type', 'text/html');
            res.end(html);
        }
    );
});

// map static folders
config.static_folders.map(function(pathInfo) {
    var relativePath = '/' + pathInfo.path + '/' + (pathInfo.versioned ? config.build : '');
    var srcPath = path.join(__dirname, config.srcPath, pathInfo.path);
    console.log(" .static folder: ", relativePath + ' -> ' + srcPath);
    server.use(relativePath, express.static(srcPath));
});

// map static folder as is
server.use('/static/', express.static(path.join(__dirname, config.srcPath, '/static/')));

// redirect from default login returnUrl
server.get('/Report/Default.aspx', function(req, res) {
    res.redirect('/');
});

server.get('/', function(req, res) {
    res.redirect('/dashboard');
});

// map any other request to the WS server
server.all('/ws/*', function(req, res) {
    var instance = req.host.split('.')[0];
    var newHost = wsProxy.replace('$instance$', instance);
    req.headers['host'] = newHost;
    
    console.log(" .ws proxy: ", newHost + ':' + wsPort + req.url);
    proxy.proxyRequest(req, res, {
      host: newHost,
      port: wsPort
    });
});

// login
server.all('/login.aspx', function(req, res) {
    var instance = req.host.split('.')[0];
    var newHost = echoProxy.replace('$instance$', instance);

    req.url = '/login.aspx?returnUrl=' + (req.query['ReturnUrl'] || ('http://' + instance + '.localhost:' + echoPort + '/'));
    req.headers['host'] = newHost;

    console.log(" .login proxy: ", newHost + ':' + wsPort + req.url);
    proxy.proxyRequest(req, res, {
      host: newHost,
      port: echoPort
    });
});


// benja test2

// login
server.all('/test2/*', function(req, res) {
    var instance = req.host.split('.')[0];
    var newHost = echoProxy.replace('$instance$', instance);

    req.url = "http://socialmetrix-lat.localhost";
    req.headers['host'] = newHost;

    console.log(" .login proxy: ", newHost + ':' + wsPort + req.url);
    proxy.proxyRequest(req, res, {
      host: newHost,
      port: 8000
    });
});

// benja email templates
// mock ping service    
server.all('/test/*', function(req, res) {
    var resource = req.url.replace("/test/", "") // extract test url
    req.pause();
    console.log('request ' + req.url);
    var options = url.parse("http://socialmetrix-lat.localhost:8000/" + resource);
    console.log("options", options)
    options.headers = req.headers;
    options.method = req.method;
    options.agent = false;

    var connector = http.request(options, function(serverResponse) {
            serverResponse.pause();
            res.writeHeader(serverResponse.statusCode, serverResponse.headers);
            serverResponse.pipe(res);
            serverResponse.resume();
    });
    req.pipe(connector);
    req.resume();
});
// mock ping service    
server.all('/Report/Ping.ashx', function(req, res) {
    res.set('Content-Type', 'text/json');
    res.end('{"status":"ok"}');
});

// map WS.legacy calls (echo.net)
server.all('/Report/*', function(req, res) {
    var instance = req.host.split('.')[0];
    var newHost = echoProxy.replace('$instance$', instance);

    req.url = '/Report/'+ req.params[0];
    req.headers['host'] = newHost;
    
    console.log(" .ws.legacy proxy: ", newHost + ':' + echoPort + req.url);
    proxy.proxyRequest(req, res, {
      host: newHost,
      port: echoPort
    });
});

// map WS.legacy calls (echo.net)
server.all('/DATA/JSON/*', function(req, res) {
    var instance = req.host.split('.')[0];
    var newHost = echoProxy.replace('$instance$', instance);

    req.url = '/DATA/JSON/'+ req.params[0];
    req.headers['host'] = newHost;
    
    console.log(" .ws.legacy proxy: ", newHost + ':' + echoPort + req.url);
    proxy.proxyRequest(req, res, {
      host: newHost,
      port: echoPort
    });
});

// start server
server.listen(port);
console.log('running on port ' + port);