weseek__growi/lib/googleAuth.js

/**
 * googleAuth utility
 */

'use strict';

var googleapis = require('googleapis');
var config   = require('config');

function createOauth2Client(url) {
  return new googleapis.auth.OAuth2Client(
    config.google.clientId,
    config.google.clientSecret,
    url
  );
}

module.exports = {
  createAuthUrl: function(req, callback) {
    var callbackUrl = req.baseUrl + '/google/callback';
    var google = createOauth2Client(callbackUrl);

    var redirectUrl = google.generateAuthUrl({
      access_type: 'offline',
      scope: 'https://www.googleapis.com/auth/userinfo.email',
    });

    callback(null, redirectUrl);
  },
  handleCallback: function(req, callback) {
    var callbackUrl = req.baseUrl + '/google/callback';
    var google = createOauth2Client(callbackUrl);
    var code = req.session.googleAuthCode || null;

    if (!code) {
      return callback(new Error('No code exists.'), null);
    }

    google.getToken(code, function(err, tokens) {
      console.log('getToken', err, tokens);
      if (err) {
        return callback(new Error('[googleAuth.handleCallback] Error to get token.'), null);
      }

      googleapis.discover('oauth2', 'v1').withOpts({cache: { path: __dirname + '/../tmp/googlecache'}}).execute(function(err, client) {
        if (err) {
          return callback(new Error('[googleAuth.handleCallback] Failed to discover oauth2 API endpoint.'), null);
        }

        var tokeninfo = client.oauth2.tokeninfo({id_token: tokens.id_token});
        tokeninfo.execute(function(err, response) {
          if (err) {
            return callback(new Error('[googleAuth.handleCallback] Error while proceccing tokeninfo.'), null);
          }

          return callback(null, response);
        });
      });
    });
  }
};