Meteor - Anon login (server.js)

(function() {

  // handler to login anonymously
  Accounts.registerLoginHandler(function(options) {
    if (!options.anonymous)
      return undefined; // don't handle

    // ok; if they are logging in, this means they don't have
    // a user yet. Create one. We don't need to ever find it again.
    var user = Accounts.insertUserDoc({generateLoginToken: true}, {}, {exists: true});

    return {token: user.token, id: user.id};
  });
})();