index.js

'use strict';


const express = require('express');
const bodyParser = require('body-parser');
var pos = 0;
const restService = express();
process.env.DEBUG = 'actions-on-google:*';
const Assistant = require('actions-on-google').ApiAiAssistant;
restService.use(bodyParser.urlencoded({
    extended: true
}));

restService.use(bodyParser.json());

restService.post('/echo', function(req, res) {

  const assistant = new Assistant({ request: req, response: res });
  var message = assistant.getArgument('echoText').toLowerCase();
  var eventos = "eventos";
  ///////
  var fs = require('fs');
  var readline = require('readline');
  var google = require('googleapis');
  var googleAuth = require('google-auth-library');

// If modifying these scopes, delete your previously saved credentials
// at ~/.credentials/calendar-nodejs-quickstart.json
  var SCOPES = ['https://www.googleapis.com/auth/calendar.readonly'];
  var TOKEN_DIR = (process.env.HOME || process.env.HOMEPATH ||
    process.env.USERPROFILE) + '/.credentials/';
  var TOKEN_PATH = TOKEN_DIR + 'calendar-nodejs-quickstart.json';
 
 if(message.indexOf(eventos) > -1) {
    // Load client secrets from a local file.
    fs.readFile('client_secret.json', function processClientSecrets(err, content) {
      if (err) {
        //console.log('Error loading client secret file: ' + err);
        return;
      }
      // Authorize a client with the loaded credentials, then call the
      // Google Calendar API.
      authorize(JSON.parse(content), listEvents);
    });

    /**
     * Create an OAuth2 client with the given credentials, and then execute the
     * given callback function.
     *
     * @param {Object} credentials The authorization client credentials.
     * @param {function} callback The callback to call with the authorized client.
     */
    function authorize(credentials, callback) {
      var clientSecret = credentials.installed.client_secret;
      var clientId = credentials.installed.client_id;
      var redirectUrl = credentials.installed.redirect_uris[0];
      var auth = new googleAuth();
      var oauth2Client = new auth.OAuth2(clientId, clientSecret, redirectUrl);

      // Check if we have previously stored a token.
      fs.readFile(TOKEN_PATH, function(err, token) {
        if (err) {
          getNewToken(oauth2Client, callback);
        } else {
          oauth2Client.credentials = JSON.parse(token);
          callback(oauth2Client);
        }
      });
    }

    /**
     * Get and store new token after prompting for user authorization, and then
     * execute the given callback with the authorized OAuth2 client.
     *
     * @param {google.auth.OAuth2} oauth2Client The OAuth2 client to get token for.
     * @param {getEventsCallback} callback The callback to call with the authorized
     *     client.
     */
    function getNewToken(oauth2Client, callback) {
      var authUrl = oauth2Client.generateAuthUrl({
        access_type: 'offline',
        scope: SCOPES
      });
      //console.log('Authorize this app by visiting this url: ', authUrl);
      var rl = readline.createInterface({
        input: process.stdin,
        output: process.stdout
      });
      rl.question('Enter the code from that page here: ', function(code) {
        rl.close();
        oauth2Client.getToken(code, function(err, token) {
          if (err) {
           // console.log('Error while trying to retrieve access token', err);
            return;
          }
          oauth2Client.credentials = token;
          storeToken(token);
          callback(oauth2Client);
        });
      });
    }


    /**s
     * Store token to disk be used in later program executions.
     *
     * @param {Object} token The token to store to disk.
     */
    function storeToken(token) {
      try {
        fs.mkdirSync(TOKEN_DIR);
      } catch (err) {
        if (err.code != 'EEXIST') {
          throw err;
        }
      }
      fs.writeFile(TOKEN_PATH, JSON.stringify(token));
     // console.log('Token stored to ' + TOKEN_PATH);
    }

    /**
     * Lists the next 10 events on the user's primary calendar.
     *
     * @param {google.auth.OAuth2} auth An authorized OAuth2 client.
     */
    function listEvents(auth) {
      var calendar = google.calendar('v3');
      var mensagem = "";
      calendar.events.list({
        auth: auth,
        calendarId: 'primary',
        timeMin: (new Date()).toISOString(),
        maxResults: 10,
        singleEvents: true,
        orderBy: 'startTime'
      }, function(err, response) {
        if (err) {
          sendResponse('The API returned an error: ');
          return;
        }
        var events = response.items;
        if (events.length == 0) {
          sendResponse('No upcoming events found.');
        } else {
          sendResponse('Upcoming 10 events:');
          for (var i = 0; i < events.length; i++) {
            var event = events[i];
            var start = event.start.dateTime || event.start.date;
            mensagem  = mensagem + start + "-" + event.summary + "/n";
            sendResponse(mensagem);
          }
        }
      });
    }
}else {
      sendResponse("Desculpa, eu não posso ajudar com isso.");
    }


    function sendResponse(msg) {
      assistant.ask(msg);
    }

});

restService.listen((process.env.PORT || 8000), function() {
    console.log("Server up and listening");
});