Encapsulated koa-basic-authentication

app.js

var koa = require('koa');
var auth = require('koa-basic-auth');
var userAuth = require('./lib/authentication.js');

var app = module.exports = koa();

// Security
app.use(userAuth.reqBasic);
app.use(auth(userAuth.user));

// listen
app.use(function *(){
  this.body = 'secret';
});

app.listen(3000);
console.log('listening on port 3000');

authentication.js

module.exports.reqBasic = function *(next){
	try { yield next; }
	catch (err) {
		if (401 == err.status) {
			this.status = 401;
			this.set('WWW-Authenticate', 'Basic');
			this.body = 'Nope... you need to authenticate first. With a proper user!';
	}
	else { throw err; }
	}
};

module.exports.user = {name:'marcus', pass:'secret'};