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index.js
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index.js
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var Promise = require("bluebird");
var AlexaUtterances = require("alexa-utterances");
var SSML = require("./to-ssml");
var alexa = {};
alexa.response = function() {
this.resolved = false;
this.response = {
"version": "1.0",
"sessionAttributes": {},
"response": {
"shouldEndSession": true
}
};
this.say = function(str) {
if (typeof this.response.response.outputSpeech == "undefined") {
this.response.response.outputSpeech = {
"type": "SSML",
"ssml": SSML.fromStr(str)
};
} else {
// append str to the current outputSpeech, stripping the out speak tag
this.response.response.outputSpeech.ssml = SSML.fromStr(str, this.response.response.outputSpeech.ssml);
}
return this;
};
this.clear = function(/*str*/) {
this.response.response.outputSpeech = {
"type": "PlainText",
"text": ""
};
return this;
};
this.reprompt = function(str) {
if (typeof this.response.response.reprompt == "undefined") {
this.response.response.reprompt = {
"outputSpeech": {
"type": "SSML",
"ssml": SSML.fromStr(str)
}
};
} else {
// append str to the current outputSpeech, stripping the out speak tag
this.response.response.reprompt.outputSpeech.ssml = SSML.fromStr(str, this.response.response.reprompt.outputSpeech.text);
}
return this;
};
this.card = function(oCard) {
if (2 == arguments.length) { //backwards compat
oCard = {
type: "Simple",
title: arguments[0],
content: arguments[1]
};
}
var requiredAttrs = [],
clenseAttrs = [];
switch (oCard.type) {
case 'Simple':
requiredAttrs.push('content');
clenseAttrs.push('content');
break;
case 'Standard':
requiredAttrs.push('text');
clenseAttrs.push('text');
if (('image' in oCard) && ( !('smallImageUrl' in oCard['image']) && !('largeImageUrl' in oCard['image']) )) {
console.error('If card.image is defined, must specify at least smallImageUrl or largeImageUrl');
return this;
}
break;
default:
break;
}
var hasAllReq = requiredAttrs.every(function(idx) {
if (!(idx in oCard)) {
console.error('Card object is missing required attr "' + idx + '"');
return false;
}
return true;
});
if (!hasAllReq) {
return this;
}
// remove all SSML to keep the card clean
clenseAttrs.forEach(function(idx) {
oCard[idx] = SSML.cleanse(oCard[idx]);
});
this.response.response.card = oCard;
return this;
};
this.linkAccount = function() {
this.response.response.card = {
"type": "LinkAccount"
};
return this;
};
this.shouldEndSession = function(bool, reprompt) {
this.response.response.shouldEndSession = bool;
if (reprompt) {
this.reprompt(reprompt);
}
return this;
};
this.session = function(key, val) {
if (typeof val == "undefined") {
return this.response.sessionAttributes[key];
} else {
this.response.sessionAttributes[key] = val;
}
return this;
};
this.clearSession = function(key) {
if (typeof key == "string" && typeof this.response.sessionAttributes[key] != "undefined") {
delete this.response.sessionAttributes[key];
} else {
this.response.sessionAttributes = {};
}
return this;
};
};
alexa.request = function(json) {
this.data = json;
this.slot = function(slotName, defaultValue) {
try {
return this.data.request.intent.slots[slotName].value;
} catch (e) {
console.error("missing intent in request: " + slotName, e);
return defaultValue;
}
};
this.type = function() {
try {
return this.data.request.type;
} catch (e) {
console.error("missing type", e);
return null;
}
};
this.sessionDetails = {
"new": this.data.session.new,
"sessionId": this.data.session.sessionId,
"userId": this.data.session.user.userId,
"accessToken": this.data.session.user.accessToken || null,
"attributes": this.data.session.attributes,
"application": this.data.session.application
};
this.userId = this.data.session.user.userId;
this.applicationId = this.data.session.application.applicationId;
this.sessionId = this.data.session.sessionId;
this.sessionAttributes = this.data.session.attributes;
this.isSessionNew = (true === this.data.session.new);
this.session = function(key) {
try {
return this.data.session.attributes[key];
} catch (e) {
console.error("key not found on session attributes: " + key, e);
return;
}
};
};
alexa.apps = {};
alexa.app = function(name, endpoint) {
var self = this;
this.name = name;
this.messages = {
// When an intent was passed in that the application was not configured to handle
"NO_INTENT_FOUND": "Sorry, the application didn't know what to do with that intent",
// When the app was used with 'open' or 'launch' but no launch handler was defined
"NO_LAUNCH_FUNCTION": "Try telling the application what to do instead of opening it",
// When a request type was not recognized
"INVALID_REQUEST_TYPE": "Error: not a valid request",
// If some other exception happens
"GENERIC_ERROR": "Sorry, the application encountered an error"
};
// Persist session variables from every request into every response?
this.persistentSession = true;
// use a minimal set of utterances or the full cartesian product?
this.exhaustiveUtterances = false;
// A catch-all error handler - do nothing by default
this.error = null;
// pre/post hooks to be run on every request
this.pre = function(/*request, response, type*/) {};
this.post = function(/*request, response, type*/) {};
this.endpoint = endpoint;
// A mapping of keywords to arrays of possible values, for expansion of sample utterances
this.dictionary = {};
this.intents = {};
this.intent = function(intentName, schema, func) {
if (typeof schema == "function") {
func = schema;
schema = null;
}
self.intents[intentName] = {
"name": intentName,
"function": func
};
if (schema) {
self.intents[intentName].schema = schema;
}
};
this.launchFunc = null;
this.launch = function(func) {
self.launchFunc = func;
};
this.sessionEndedFunc = null;
this.sessionEnded = function(func) {
self.sessionEndedFunc = func;
};
this.request = function(request_json) {
return new Promise(function(resolve, reject) {
var request = new alexa.request(request_json);
var response = new alexa.response();
var postExecuted = false;
// Attach Promise resolve/reject functions to the response object
response.send = function(exception) {
if (typeof self.post == "function" && !postExecuted) {
postExecuted = true;
self.post(request, response, requestType, exception);
}
if (!response.resolved) {
response.resolved = true;
resolve(response.response);
}
};
response.fail = function(msg, exception) {
if (typeof self.post == "function" && !postExecuted) {
postExecuted = true;
self.post(request, response, requestType, exception);
}
if (!response.resolved) {
response.resolved = true;
reject(msg);
}
};
try {
var key;
// Copy all the session attributes from the request into the response so they persist.
// The Alexa API doesn't think session variables should persist for the entire
// duration of the session, but I do.
if (request.sessionAttributes && self.persistentSession) {
for (key in request.sessionAttributes) {
response.session(key, request.sessionAttributes[key]);
}
}
var requestType = request.type();
if (typeof self.pre == "function") {
self.pre(request, response, requestType);
}
if (!response.resolved) {
if ("IntentRequest" === requestType) {
var intent = request_json.request.intent.name;
if (typeof self.intents[intent] != "undefined" && typeof self.intents[intent]["function"] == "function") {
if (false !== self.intents[intent]["function"](request, response)) {
response.send();
}
} else {
throw "NO_INTENT_FOUND";
}
} else if ("LaunchRequest" === requestType) {
if (typeof self.launchFunc == "function") {
if (false !== self.launchFunc(request, response)) {
response.send();
}
} else {
throw "NO_LAUNCH_FUNCTION";
}
} else if ("SessionEndedRequest" === requestType) {
if (typeof self.sessionEndedFunc == "function") {
if (false !== self.sessionEndedFunc(request, response)) {
response.send();
}
}
} else {
throw "INVALID_REQUEST_TYPE";
}
}
} catch (e) {
if (typeof self.error == "function") {
self.error(e, request, response);
} else if (typeof e == "string" && self.messages[e]) {
response.say(self.messages[e]);
response.send(e);
}
if (!response.resolved) {
response.fail("Unhandled exception" + e.message, e);
}
}
});
};
// Extract the schema and generate a schema JSON object
this.schema = function() {
var schema = {
"intents": []
}, intentName, intent, key;
for (intentName in self.intents) {
intent = self.intents[intentName];
var intentSchema = {
"intent": intent.name,
"slots": []
};
if (intent.schema) {
if (intent.schema.slots) {
for (key in intent.schema.slots) {
intentSchema.slots.push({
"name": key,
"type": intent.schema.slots[key]
});
}
}
}
schema.intents.push(intentSchema);
}
return JSON.stringify(schema, null, 3);
};
// Generate a list of sample utterances
this.utterances = function() {
var intentName,
intent,
out = "";
for (intentName in self.intents) {
intent = self.intents[intentName];
if (intent.schema && intent.schema.utterances) {
intent.schema.utterances.forEach(function(sample) {
var list = AlexaUtterances(sample,
intent.schema.slots,
self.dictionary,
self.exhaustiveUtterances);
list.forEach(function(utterance) {
out += intent.name + "\t" + (utterance.replace(/\s+/g, " ")).trim() + "\n";
});
});
}
}
return out;
};
// A built-in handler for AWS Lambda
this.handler = function(event, context) {
self.request(event)
.then(function(response) {
context.succeed(response);
})
.catch(function(response) {
context.fail(response);
});
};
// For backwards compatibility
this.lambda = function() {
return self.handler;
};
// A utility method to bootstrap alexa endpoints into express automatically
this.express = function(express, path, enableDebug) {
var endpoint = (path || "/") + (self.endpoint || self.name);
express.post(endpoint, function(req, res) {
self.request(req.body).then(function(response) {
res.json(response);
}, function() {
res.status(500).send("Server Error");
});
});
if (typeof enableDebug != "boolean") {
enableDebug = true;
}
if (enableDebug) {
express.get(endpoint, function(req, res) {
res.render("test", {
"json": self,
"schema": self.schema(),
"utterances": self.utterances()
});
});
}
};
// Add the app to the global list of named apps
if (name) {
alexa.apps[name] = self;
}
return this;
};
module.exports = alexa;