react steam auth

1passport.use(new SteamStrategy({    returnURL: 'http://localhost:3000/auth/steam/return',    realm: 'http://localhost:3000/',    apiKey: 'your steam API key'  },  function(identifier, profile, done) {    User.findByOpenID({ openId: identifier }, function (err, user) {      return done(err, user);    });  }));