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server.js
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server.js
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/**
* Copyright 2019 Artificial Solutions. All Rights Reserved.
*
* Licensed under the Apache License, Version 2.0 (the "License");
* you may not use this file except in compliance with the License.
* You may obtain a copy of the License at
*
* http://www.apache.org/licenses/LICENSE-2.0
*
* Unless required by applicable law or agreed to in writing, software
* distributed under the License is distributed on an "AS IS" BASIS,
* WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
* See the License for the specific language governing permissions and
* limitations under the License.
*/
const express = require('express');
const bodyParser = require('body-parser')
const TIE = require('@artificialsolutions/tie-api-client');
if (process.env.NODE_ENV !== 'production') {
require('dotenv').config()
}
//const dotenv = require('dotenv');
//dotenv.config();
const {
TENEO_ENGINE_URL,
} = process.env;
if (!TENEO_ENGINE_URL) {
throw new Error('Missing environment variable TENEO_ENGINE_URL!');
}
const app = express();
app.use(bodyParser.urlencoded({
extended: true
}))
app.use(bodyParser.json())
//Create Teneo API interface
const teneoApi = TIE.init(TENEO_ENGINE_URL);
// initialise session handler, to store mapping between Alexa and engine session id
const sessionHandler = SessionHandler();
// Builds a JSON formatted response for Alexa. Contains an output text and possibly, a flag to close the bot session within Alexa.
function buildAlexaResponse(outputText, shouldEndSession){
var outputSpeechValue = {}
if (!(typeof outputText == 'undefined' || !outputText || outputText.length === 0 || outputText === "" || !/[^\s]/.test(outputText) || /^\s*$/.test(outputText) || outputText.replace(/\s/g,"") === "")){
//construct json if the outputText is a valid string
outputSpeechValue = {
type: 'SSML',
text: outputText,
ssml: '<speak>' + outputText + '</speak>'
}
}
const alexaResponse = {
version: '1.0',
response: {
shouldEndSession: shouldEndSession,
outputSpeech: outputSpeechValue
}
}
return alexaResponse
}
// Register a webhook handler with the connector
app.post('/', async function(req, res) {
if (req.body.request.type == "SessionEndedRequest") {
//Close Teneo's session within Alexa's conversation, and erase the session ID.
sessionHandler.setSession(req.body.session.sessionId, "")
res.send(buildAlexaResponse("",true)); //send true to end session
}
var teneoResponseText = ""
if (req.body.request.type == "LaunchRequest") {
//Handle a launch request to our Teneo bot by saying "hello"
teneoResponseText = await handleAlexaMessage("hello", "") //greeting
res.send(buildAlexaResponse(teneoResponseText,false))
}
if (req.body.request.type == "IntentRequest") {
const intentName = req.body.request.intent.name
const alexaSessionID = req.body.session.sessionId
if (intentName == "teneointent") {
//Fetch the exact user input from the RawInput Slot
const userInput = req.body.request.intent.slots.RawInput.value
teneoResponseText = await handleAlexaMessage(userInput, alexaSessionID)
console.log(`Teneo response:\n ${teneoResponseText}`)
//Build a response to Rrlay Teneo's reply to Alexa
res.send(buildAlexaResponse(teneoResponseText,false))
}
//React to intents that signal an end of session for a Teneo bot within Alexa
if ((intentName == "AMAZON.CancelIntent") || (intentName == "AMAZON.StopIntent")) {
//Say farewell to Teneo bot
teneoResponseText = await handleAlexaMessage("bye", alexaSessionID)
//Tell Alexa to close session with Teneo bot (end session parameter = true)
res.send(buildAlexaResponse(teneoResponseText,true))
//Wipe out Teneo session
sessionHandler.setSession(req.body.session.sessionId, "")
}
}
});
async function handleAlexaMessage(alexaMessage, userID) {
// check if there's an engine sessionid for this caller
const teneoSessionId = sessionHandler.getSession(userID);
// send input to engine using stored sessionid and retreive response
const teneoResponse = await teneoApi.sendInput(teneoSessionId, {
'text': alexaMessage,
'channel':'amazon-alexa'
});
teneoTextReply = teneoResponse.output.text
console.log(`teneoResponse: ${teneoTextReply}`)
// store engine sessionid for this caller
sessionHandler.setSession(userID, teneoResponse.sessionId);
return teneoTextReply
}
var port = process.env.PORT || 3467;
app.listen(port, () => console.log(`Teneo-Alexa connector listening on port ${port}, ENDPOINT: ${TENEO_ENGINE_URL}`))
/***
* SESSION HANDLER
***/
function SessionHandler() {
// Map Alexa's SID to Teneo engine's session id.
// This code keeps the map in memory, which is ok for testing purposes
// For production usage it is advised to make use of more resilient storage mechanisms like redis
const sessionMap = new Map();
return {
getSession: (userId) => {
if (sessionMap.size > 0) {
return sessionMap.get(userId);
} else {
return "";
}
},
setSession: (userId, sessionId) => {
sessionMap.set(userId, sessionId)
}
};
}