jaumard/proxy.js

## proxy.js
/**
 * Node.js proxy to redirect domain to correct server
 * Also check is server is alive or send a maintenance page
 */
var http = require('http'),
    httpProxy = require('http-proxy'),
    proxy = httpProxy.createProxyServer({}),
    request = require('request'),
    domains = {
	"domain1.com" : "localhost:8080",
	"dev.domain1.com" : "localhost:8081",
	"domain2.com" : "localhost:8082",
	"default" : "localhost:8080"
};

var maintenance = "<!DOCTYPE html>"+ "<title>Site Maintenance</title>" + "<style>" + "  body { text-align: center; padding: 150px; }" + "  h1 { font-size: 50px; }" + "  body { font: 20px Helvetica, sans-serif; color: #333; }" + "  article { display: block; text-align: left; width: 650px; margin: 0 auto; }" + "  a { color: #1bbc9b; text-decoration: none; }" + "  a:hover { color: #109a7e; text-decoration: none; }" + "</style>" + "<article>" + "    <h1>We&rsquo;ll be back soon!</h1>" + "    <div>" + "        <p>Sorry for the inconvenience but we&rsquo;re performing some maintenance at the moment. If you need to you can always <a href=\"mailto:me@me.com\">contact us</a>, otherwise we&rsquo;ll be back online shortly!</p>" + "        <p>&mdash; My Team</p>" + "    </div>" + "</article>";

//Check is server is alive, if not respond a maintenance page
var checkServerAvailability = function (req, res, url)
{
	request(url + '/isAlive', function (error, response, body)
	{
		if (!error && response.statusCode == 200)
		{
			proxy.web(req, res, {target : url});
		}
		else
		{
			res.writeHeader(503, {"Content-Type" : "text/html"});
			res.write(maintenance);
			res.end();
		}
	});
};

var server = http.createServer(function (req, res)
{
	var hostname = "";
	//If server call with domaine and not call with IP directly
	if (req.headers.host)
	{
		hostname = req.headers.host.split(":")[0];
	}

    	//If it's a know domain, redirect to correct server
	if (domains[hostname])
	{
		checkServerAvailability(req, res, 'http://' + domains[hostname]);
	}
	else
	{
		checkServerAvailability(req, res, 'http://' + domains["default"]);
	}
});

// Listen to the `upgrade` event and proxy the
// WebSocket requests as well.
server.on('upgrade', function (req, socket, head)
{
	var hostname = "";
	//If server call with domaine
	if (req.headers.host)
	{
		hostname = req.headers.host.split(":")[0];
	}

	//If it's a know domain, redirect to correct server
	if (domains[hostname])
	{
		proxy.web(req, socket, {target : 'ws://' + domains[hostname]});
	}
	else
	{
		proxy.web(req, socket, {target : 'ws://' + domains["default"]});
	}
});

//Catch error to prevent proxy crash
proxy.on('error', function (err)
{
	console.error(err);
});

server.listen(80, function ()
{
	console.info('proxy listening on port 80');
});
	/**
	* Node.js proxy to redirect domain to correct server
	* Also check is server is alive or send a maintenance page
	*/
	var http = require('http'),
	httpProxy = require('http-proxy'),
	proxy = httpProxy.createProxyServer({}),
	request = require('request'),
	domains = {
	"domain1.com" : "localhost:8080",
	"dev.domain1.com" : "localhost:8081",
	"domain2.com" : "localhost:8082",
	"default" : "localhost:8080"
	};

	var maintenance = "<!DOCTYPE html>"+ "<title>Site Maintenance</title>" + "<style>" + " body { text-align: center; padding: 150px; }" + " h1 { font-size: 50px; }" + " body { font: 20px Helvetica, sans-serif; color: #333; }" + " article { display: block; text-align: left; width: 650px; margin: 0 auto; }" + " a { color: #1bbc9b; text-decoration: none; }" + " a:hover { color: #109a7e; text-decoration: none; }" + "</style>" + "<article>" + " <h1>We’ll be back soon!</h1>" + " <div>" + " <p>Sorry for the inconvenience but we’re performing some maintenance at the moment. If you need to you can always <a href=\"mailto:me@me.com\">contact us</a>, otherwise we’ll be back online shortly!</p>" + " <p>— My Team</p>" + " </div>" + "</article>";

	//Check is server is alive, if not respond a maintenance page
	var checkServerAvailability = function (req, res, url)
	{
	request(url + '/isAlive', function (error, response, body)
	{
	if (!error && response.statusCode == 200)
	{
	proxy.web(req, res, {target : url});
	}
	else
	{
	res.writeHeader(503, {"Content-Type" : "text/html"});
	res.write(maintenance);
	res.end();
	}
	});
	};

	var server = http.createServer(function (req, res)
	{
	var hostname = "";
	//If server call with domaine and not call with IP directly
	if (req.headers.host)
	{
	hostname = req.headers.host.split(":")[0];
	}

	//If it's a know domain, redirect to correct server
	if (domains[hostname])
	{
	checkServerAvailability(req, res, 'http://' + domains[hostname]);
	}
	else
	{
	checkServerAvailability(req, res, 'http://' + domains["default"]);
	}
	});

	// Listen to the `upgrade` event and proxy the
	// WebSocket requests as well.
	server.on('upgrade', function (req, socket, head)
	{
	var hostname = "";
	//If server call with domaine
	if (req.headers.host)
	{
	hostname = req.headers.host.split(":")[0];
	}

	//If it's a know domain, redirect to correct server
	if (domains[hostname])
	{
	proxy.web(req, socket, {target : 'ws://' + domains[hostname]});
	}
	else
	{
	proxy.web(req, socket, {target : 'ws://' + domains["default"]});
	}
	});

	//Catch error to prevent proxy crash
	proxy.on('error', function (err)
	{
	console.error(err);
	});

	server.listen(80, function ()
	{
	console.info('proxy listening on port 80');
	});