A minimalist framework for Alexa Skills Kit apps running on Amazon Lambda (or as a web service), inspired by the syntax of Express.js.
var expressive = require('echo-expressive');
var app = expressive(MY_APP_ID); // app id is optional, but filters requests
// install a middleware, they way you'd expect
app.use(function(req, res, next) {
// read session attributes with the key
if (req.attr('user')) {
// it's already set, move along
next();
return;
}
// asynchronous processing
User.find(req.session.user.userId, function(err, user) {
if (err) return next(err);
// set session attributes with key and value
req.attr('user', user);
next();
});
});
// if you want to process slots for intent requests,
// you can do that, too
app.slot('recipient-name', function(req, res, next, name) {
// This will be called after the above, as expected,
// and only when the `recipient-name` slot was provided
// in an IntentRequest.
User.findByName(name, function(err, recipient) {
if (err) return next(err);
req.attr('recipient', recipient);
next();
});
});
// instead of get() or post(), use Echo verbs.
// start(), launch(), intent(), and end()
app.start(function(req) {
// this is called when a new Session has started
// You can use it to prepare any resources
});
app.launch(function(req, res) {
// LaunchRequest received
res.tell("Welcome to my app");
});
app.intent('SendIntent', function(req, res) {
// specific IntentRequest received
res.ask("What would you like to send?");
});
app.intent('SendWithMessageIntent', function(req, res) {
// specific IntentRequest received
res.tell("Message sent!");
});
app.end(function(req) {
// this is called when a Session has ended.
// You can use it to clean up any resources
});
// install for use on Lambda
app.handle(module.exports);
// or, listen like a web service
app.listen(8080);- Abstract routes further so sets of routes can be mounted like in Express