remoteip/lib/remoteip.js

Get the client IP address for the remote browser.

//
// https://gist.github.com/qiao/1626318
// snippet taken from http://catapulty.tumblr.com/post/8303749793/heroku-and-node-js-how-to-get-the-client-ip-address
//
exports.get = function(req) {
	var ipAddress;
	
	// The request may be forwarded from local web server.
	var forwardedIpsStr = req.header('x-forwarded-for'); 
	if (forwardedIpsStr) {
		// 'x-forwarded-for' header may return multiple IP addresses in
		// the format: "client IP, proxy 1 IP, proxy 2 IP" so take the
		// the first one
		var forwardedIps = forwardedIpsStr.split(',');
		ipAddress = forwardedIps[0];
	}
	if (!ipAddress) {
		// If request was not forwarded
		ipAddress = req.connection.remoteAddress;
	}
	
	return ipAddress;
}