index.js

// This sample demonstrates handling intents from an Alexa skill using the Alexa Skills Kit SDK (v2).
// Please visit https://alexa.design/cookbook for additional examples on implementing slots, dialog management,
// session persistence, api calls, and more.
const Alexa = require('ask-sdk-core');
const persistenceAdapter = require('ask-sdk-s3-persistence-adapter');

const LaunchRequestHandler = {
    canHandle(handlerInput) {
        return handlerInput.requestEnvelope.request.type === 'LaunchRequest';
    },
    handle(handlerInput) {
        const speakOutput = 'Hello! Welcome to  Cake time. What is your birthday?';
        const repromptText = 'I was born Nov. 6th, 2014. When were you born?';    

        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt(repromptText)
            .getResponse();
    }
};
const HasBirthdayLaunchRequestHandler = {
    canHandle(handlerInput) {
        
        const attributesManager = handlerInput.attributesManager;
        const sessionAttributes = attributesManager.getSessionAttributes() || {};
        
        const year = sessionAttributes.hasOwnProperty('year') ? sessionAttributes.year : 0;
        const month = sessionAttributes.hasOwnProperty('month') ? sessionAttributes.month : 0;
        const day = sessionAttributes.hasOwnProperty('day') ? sessionAttributes.day : 0;
        
        return handlerInput.requestEnvelope.request.type === 'LaunchRequest' &&
            year &&
            month &&
            day;
        
    },
    handle(handlerInput) {
        
        const attributesManager = handlerInput.attributesManager;
        const sessionAttributes = attributesManager.getSessionAttributes() || {};
        
        const year = sessionAttributes.hasOwnProperty('year') ? sessionAttributes.year : 0;
        const month = sessionAttributes.hasOwnProperty('month') ? sessionAttributes.month : 0;
        const day = sessionAttributes.hasOwnProperty('day') ? sessionAttributes.day : 0;
        
        // TODO:: Use the settings API to get current date and then compute how many days until user's birthday
        // TODO:: Say Happy birthday on the user's birthday
        
        const speakOutput = `Welcome back. It looks like there are X more days until your y-th birthday.`;
        
        return handlerInput.responseBuilder
            .speak(speakOutput)
            .getResponse();
    }
};
const CaptureBirthdayIntentHandler = {
    canHandle(handlerInput) {
        return handlerInput.requestEnvelope.request.type === 'IntentRequest'
            && handlerInput.requestEnvelope.request.intent.name === 'CaptureBirthdayIntent';
    },
    async handle(handlerInput) {
        const year = handlerInput.requestEnvelope.request.intent.slots.year.value;
        const month = handlerInput.requestEnvelope.request.intent.slots.month.value;
        const day = handlerInput.requestEnvelope.request.intent.slots.day.value;
        
        const attributesManager = handlerInput.attributesManager;
        
        let birthdayAttributes = {
            "year": year,
            "month": month,
            "day": day
            
        };
        attributesManager.setPersistentAttributes(birthdayAttributes);
        await attributesManager.savePersistentAttributes();    
        
        const speakOutput = `Thanks, I'll remember that you were born ${month} ${day} ${year}.`;
        return handlerInput.responseBuilder
            .speak(speakOutput)
            //.reprompt('add a reprompt if you want to keep the session open for the user to respond')
            .getResponse();
    }
};

const HelpIntentHandler = {
    canHandle(handlerInput) {
        return handlerInput.requestEnvelope.request.type === 'IntentRequest'
            && handlerInput.requestEnvelope.request.intent.name === 'AMAZON.HelpIntent';
    },
    handle(handlerInput) {
        const speakOutput = 'You can say hello to me! How can I help?';

        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt(speakOutput)
            .getResponse();
    }
};
const CancelAndStopIntentHandler = {
    canHandle(handlerInput) {
        return handlerInput.requestEnvelope.request.type === 'IntentRequest'
            && (handlerInput.requestEnvelope.request.intent.name === 'AMAZON.CancelIntent'
                || handlerInput.requestEnvelope.request.intent.name === 'AMAZON.StopIntent');
    },
    handle(handlerInput) {
        const speakOutput = 'Goodbye!';
        return handlerInput.responseBuilder
            .speak(speakOutput)
            .getResponse();
    }
};
const SessionEndedRequestHandler = {
    canHandle(handlerInput) {
        return handlerInput.requestEnvelope.request.type === 'SessionEndedRequest';
    },
    handle(handlerInput) {
        // Any cleanup logic goes here.
        return handlerInput.responseBuilder.getResponse();
    }
};

// The intent reflector is used for interaction model testing and debugging.
// It will simply repeat the intent the user said. You can create custom handlers
// for your intents by defining them above, then also adding them to the request
// handler chain below.
const IntentReflectorHandler = {
    canHandle(handlerInput) {
        return handlerInput.requestEnvelope.request.type === 'IntentRequest';
    },
    handle(handlerInput) {
        const intentName = handlerInput.requestEnvelope.request.intent.name;
        const speakOutput = `You just triggered ${intentName}`;

        return handlerInput.responseBuilder
            .speak(speakOutput)
            //.reprompt('add a reprompt if you want to keep the session open for the user to respond')
            .getResponse();
    }
};

// Generic error handling to capture any syntax or routing errors. If you receive an error
// stating the request handler chain is not found, you have not implemented a handler for
// the intent being invoked or included it in the skill builder below.
const ErrorHandler = {
    canHandle() {
        return true;
    },
    handle(handlerInput, error) {
        console.log(`~~~~ Error handled: ${error.message}`);
        const speakOutput = `Sorry, I couldn't understand what you said. Please try again.`;

        return handlerInput.responseBuilder
            .speak(speakOutput)
            .reprompt(speakOutput)
            .getResponse();
    }
};

const LoadBirthdayInterceptor = {
    async process(handlerInput) {
        const attributesManager = handlerInput.attributesManager;
        const sessionAttributes = await attributesManager.getPersistentAttributes() || {};
        
        const year = sessionAttributes.hasOwnProperty('year') ? sessionAttributes.year : 0;
        const month = sessionAttributes.hasOwnProperty('month') ? sessionAttributes.month : 0;
        const day = sessionAttributes.hasOwnProperty('day') ? sessionAttributes.day : 0;
        
        if (year && month && day) {
            attributesManager.setSessionAttributes(sessionAttributes);
        }
    }
}

// The SkillBuilder acts as the entry point for your skill, routing all request and response
// payloads to the handlers above. Make sure any new handlers or interceptors you've
// defined are included below. The order matters - they're processed top to bottom.
exports.handler = Alexa.SkillBuilders.custom()
    .withPersistenceAdapter(
        new persistenceAdapter.S3PersistenceAdapter({bucketName:process.env.S3_PERSISTENCE_BUCKET})
    )
    .addRequestHandlers(
        HasBirthdayLaunchRequestHandler,
        LaunchRequestHandler,
        CaptureBirthdayIntentHandler,
        HelpIntentHandler,
        CancelAndStopIntentHandler,
        SessionEndedRequestHandler,
        IntentReflectorHandler) // make sure IntentReflectorHandler is last so it doesn't override your custom intent handlers
    .addRequestInterceptors(
        LoadBirthdayInterceptor
    )
    .addErrorHandlers(
        ErrorHandler)
    .lambda();