index.js

/* eslint-disable func-names */
/* eslint quote-props: ["error", "consistent"] */

const Alexa = require('alexa-sdk');
const https = require('https');

let alexa;

const APP_ID = 'amzn1.ask.skill.70498491-196e-40ad-8763-3f77d7a35318';

const languageStrings = {
  'en': {
    translation: {
      SKILL_NAME: 'Share Price',
      GET_SHARE_PRICE_MESSAGE_1: 'The current share price for <say-as interpret-as="spell-out">',
      GET_SHARE_PRICE_MESSAGE_2: '</say-as> is: ',
      GET_INVALID_SHARE_PRICE_MESSAGE: 'Sorry, I couldn\'t get the share price for ',
      HELP_MESSAGE: 'You can say give me the share price for <say-as interpret-as="spell-out">SBRY</say-as>, or, you can say exit... What can I help you with?',
      HELP_REPROMPT: 'What can I help you with?',
      UNHANDLED_MESSAGE: 'Sorry, I didn\'t understand your request.',
      STOP_MESSAGE: 'Goodbye!',
    },
  },
};

function httpGet(query, callback) {
  console.log(`Query: ${query}`);

  const options = {
    host: 'www.alphavantage.co',
    path: `/query?function=TIME_SERIES_INTRADAY&symbol=LON:${query}&interval=1min&apikey=3E1HUGJQ89TUJZIH`,
    method: 'GET',
  };
  const req = https.request(options, (res) => {
    let body = '';

    res.on('data', (d) => {
      body += d;
    });

    res.on('end', () => {
      callback(body);
    });
  });
  req.end();
  req.on('error', (error) => {
    console.error(`ERROR: ${error}`);
  });
}

const handlers = {
  'LaunchRequest': function () {
    this.emit('AMAZON.HelpIntent');
  },
  'GetSharePriceIntent': function () {
    const stockSymbol = this.event.request.intent.slots.Symbol.value;
    let sharePrice = '';
    let speechOutput = '';
    const sharePriceMessage1 = this.t('GET_SHARE_PRICE_MESSAGE_1');
    const sharePriceMessage2 = this.t('GET_SHARE_PRICE_MESSAGE_2');
    const invalidSharePriceMessage = this.t('GET_INVALID_SHARE_PRICE_MESSAGE');
    const skillName = this.t('SKILL_NAME');

    if (stockSymbol !== encodeURIComponent(stockSymbol)) {
      speechOutput = invalidSharePriceMessage + stockSymbol;
      console.log(`Speech Output: ${speechOutput}`);
      alexa.emit(':tellWithCard', speechOutput, `${stockSymbol} ${skillName}`, sharePrice);
    } else {
      httpGet(stockSymbol, (response) => {
        try {
          const responseData = JSON.parse(response);

          const lastRefreshed = responseData['Meta Data']['3. Last Refreshed'];
          console.log(`Last Refreshed: ${lastRefreshed}`);

          sharePrice = responseData['Time Series (1min)'][lastRefreshed]['1. open'];
          console.log(`Share Price: ${sharePrice}`);
        } catch (err) {
          console.error('Error parsing json response, likely request did not succeed');
        }

        // Create speech output
        if (sharePrice === '') {
          speechOutput = invalidSharePriceMessage + stockSymbol;
        } else {
          speechOutput = sharePriceMessage1 + stockSymbol + sharePriceMessage2 + sharePrice;
        }
        console.log(`Speech Output: ${speechOutput}`);

        alexa.emit(':tellWithCard', speechOutput, `${stockSymbol} ${skillName}`, sharePrice);
      });
    }
  },
  'AMAZON.HelpIntent': function () {
    const speechOutput = this.t('HELP_MESSAGE');
    const reprompt = this.t('HELP_REPROMPT');
    this.emit(':ask', speechOutput, reprompt);
  },
  'AMAZON.CancelIntent': function () {
    this.emit(':tell', this.t('STOP_MESSAGE'));
  },
  'AMAZON.StopIntent': function () {
    this.emit(':tell', this.t('STOP_MESSAGE'));
  },
  'Unhandled': function () {
    this.emit(':tell', this.t('UNHANDLED_MESSAGE'));
  },
};

exports.handler = function (event, context) {
  alexa = Alexa.handler(event, context);
  alexa.resources = languageStrings;
  alexa.appId = APP_ID;
  alexa.registerHandlers(handlers);
  alexa.execute();
};