text: var fs = require('fs');
  var google = require('googleapis');
  var readline = require('readline');
  var googleAuth = require('google-auth-library');
  
  var offset = 0;
  
  // If modifying these scopes, delete your previously saved credentials
  // at ~/.credentials/sheets.googleapis.com-nodejs-quickstart.json
  var SCOPES = ['https://www.googleapis.com/auth/spreadsheets', 'https://www.googleapis.com/auth/drive'];
  var TOKEN_DIR = (process.env.HOME || process.env.HOMEPATH ||
      process.env.USERPROFILE) + '/.credentials/';
  var TOKEN_PATH = TOKEN_DIR + 'sheets.googleapis.com-nodejs-frc5572';
  
  module.exports.authenticate = function(callback, noauth) {
    fs.readFile(process.argv[2] + '/secret.json', function processClientSecrets(err, content) {
    if (err) {
      console.log('Error loading client secret file: ' + err);
      return;
    }
    authorize(JSON.parse(content), callback, noauth);
  });
  }
  
  module.exports.reset_auth = function(){
    offset++;
  }
  
  /**
   * 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, noauth) {
    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 + offset + ".json", function(err, token) {
      if (err) {
        getNewToken(oauth2Client, callback, noauth);
      } 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, noauth) {
    var authUrl = oauth2Client.generateAuthUrl({
      access_type: 'offline',
      scope: SCOPES
    });
    noauth(authUrl, function(code){
        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 + offset + ".json", JSON.stringify(token));
    console.log('Token stored to ' + TOKEN_PATH + offset + ".json");
  }