googleCalendar nodejs parser

googleCalendar_nodejs_parser.js

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';
var CalendarMapCount = {};
var CalendarMapData = {};

// 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);
    });
  });
}

/**
 * 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, pageToken) {
  var calendar = google.calendar('v3');
  var queryOptions = {
    auth: auth,
    calendarId: 'primary',
    timeMax: (new Date()).toISOString(),
    singleEvents: true,
    orderBy: 'startTime'
  };
  if (pageToken) {
    queryOptions.pageToken = pageToken;
  }
  calendar.events.list(queryOptions, function (err, response) {
    if (err) {
      console.log('The API returned an error: ' + err);
      return;
    }
    var events = response.items;
    if (events.length == 0) {
      console.log('No upcoming events found.');
    } else {
      for (var i = 0; i < events.length; i++) {
        var event = events[i];
        var start = event.start.date || event.start.dateTime;
        var dateString = start.split('T')[0];
        var colorId = event.colorId || 'default';
        CalendarMapCount[colorId] = CalendarMapCount[colorId] || {};
        CalendarMapData[colorId] = CalendarMapData[colorId] || {};
        CalendarMapCount[colorId][dateString] = (CalendarMapCount[colorId][dateString] || 0) + 1;
        CalendarMapData[colorId][dateString] = event.summary;
      }
      if (!response.nextSyncToken && !!response.nextPageToken) {
        // means we have more data, query again!
        return listEvents(auth, response.nextPageToken);
      }
      var headerColors = Object.keys(CalendarMapCount);
      headerColors.forEach((colorId) => {
        var headerDate = Object.keys(CalendarMapCount[colorId]);
        fs.appendFile(`calendarData-${colorId}.csv`, `date,colorIdNum\n`, 'utf8', (err) => {
          if (err) throw err;
          headerDate.forEach((date) => {
            fs.appendFile(`calendarData-${colorId}.csv`, `${date},${CalendarMapCount[colorId][date]}\n`, 'utf8', (err) => {
              if (err) throw err;
            });
          });
        });
      });
      return;
    }
  });
}