Restify Node.js WS that executes a singleton cmd shell process. Was used as a POC for a WS controllable Raspberry Pi LED Text Ticker.

gistfile1.txt

var restify = require('restify');
var sys = require('sys')
var exec = require('child_process').exec;
var child;
var USERNAME = 'sal';
var PASSWORD = '16BrooksSt';
var CMD = "emacs";

//**** REST CODE ******
function respond(req, res, next) {

	if (req.authorization.basic && req.authorization.basic.username == USERNAME && 
	req.authorization.basic.password == PASSWORD) {

		//Kill old process
		if (child) {
			child.kill("SIGKILL");
		}

		//Start new Process - Async
		child = exec(CMD + ' ' + req.query.text, function (error, stdout, stderr) {
			// next.ifError(error);
			//sys.puts(stdout);
			console.log(stdout);
			res.send("Sent");
		});

		
  		next();
	} else {
  		return next(new restify.errors.UnauthorizedError);
	}
}

var server = restify.createServer();
server.use(restify.authorizationParser());
server.use(restify.queryParser());
server.get('/led', respond);

server.listen(8080, function() {
  console.log('%s listening at %s', server.name, server.url);
});