index.js

var server = require('./server');
var router = require('./router');
var authHelper = require('./authHelper');
var outlook = require('node-outlook');

var handle = {};
handle['/'] = home;
handle['/authorize'] = authorize;

server.start(router.route, handle);

function home(response, request) {
  console.log('Request handler \'home\' was called.');
  response.writeHead(200, {'Content-Type': 'text/html'});
  response.write('<p>Please <a href="' + authHelper.getAuthUrl() + '">sign in</a> with your Office 365 or Outlook.com account.</p>');
  response.end();
}

var url = require('url');
function authorize(response, request) {
  console.log('Request handler \'authorize\' was called.');
  
  // The authorization code is passed as a query parameter
  var url_parts = url.parse(request.url, true);
  var code = url_parts.query.code;
  console.log('Code: ' + code);
  authHelper.getTokenFromCode(code, tokenReceived, response);
}

function getUserEmail(token, callback) {
  // Set the API endpoint to use the v2.0 endpoint
  outlook.base.setApiEndpoint('https://outlook.office.com/api/v2.0');

  // Set up oData parameters
  var queryParams = {
    '$select': 'DisplayName, EmailAddress',
  };

  outlook.base.getUser({token: token, odataParams: queryParams}, function(error, user){
    if (error) {
      callback(error, null);
    } else {
      callback(null, user.EmailAddress);
    }
  });
}

function tokenReceived(response, error, token) {
  if (error) {
    console.log('Access token error: ', error.message);
    response.writeHead(200, {'Content-Type': 'text/html'});
    response.write('<p>ERROR: ' + error + '</p>');
    response.end();
  } else {
    getUserEmail(token.token.access_token, function(error, email){
      if (error) {
        console.log('getUserEmail returned an error: ' + error);
        response.write('<p>ERROR: ' + error + '</p>');
        response.end();
      } else if (email) {
        var cookies = ['node-tutorial-token=' + token.token.access_token + ';Max-Age=4000',
                       'node-tutorial-refresh-token=' + token.token.refresh_token + ';Max-Age=4000',
                       'node-tutorial-token-expires=' + token.token.expires_at.getTime() + ';Max-Age=4000',
                       'node-tutorial-email=' + email + ';Max-Age=4000'];
        response.setHeader('Set-Cookie', cookies);
        response.writeHead(302, {'Location': 'http://localhost:8000/mail'});
        response.end();
      }
    }); 
  }
}

function getAccessToken(request, response, callback) {
  var expiration = new Date(parseFloat(getValueFromCookie('node-tutorial-token-expires', request.headers.cookie)));

  if (expiration <= new Date()) {
    // refresh token
    console.log('TOKEN EXPIRED, REFRESHING');
    var refresh_token = getValueFromCookie('node-tutorial-refresh-token', request.headers.cookie);
    authHelper.refreshAccessToken(refresh_token, function(error, newToken){
      if (error) {
        callback(error, null);
      } else if (newToken) {
        var cookies = ['node-tutorial-token=' + newToken.token.access_token + ';Max-Age=4000',
                       'node-tutorial-refresh-token=' + newToken.token.refresh_token + ';Max-Age=4000',
                       'node-tutorial-token-expires=' + newToken.token.expires_at.getTime() + ';Max-Age=4000'];
        response.setHeader('Set-Cookie', cookies);
        callback(null, newToken.token.access_token);
      }
    });
  } else {
    // Return cached token
    var access_token = getValueFromCookie('node-tutorial-token', request.headers.cookie);
    callback(null, access_token);
  }
}

function getValueFromCookie(valueName, cookie) {
  if (cookie.indexOf(valueName) !== -1) {
    var start = cookie.indexOf(valueName) + valueName.length + 1;
    var end = cookie.indexOf(';', start);
    end = end === -1 ? cookie.length : end;
    return cookie.substring(start, end);
  }
}