torii & emberfire authentication close session if currentUser.email doesn't contain specific domain

I just added torii and emberfire to my ember project. The issue is at this point any user with a google account can authenticate and use the app. I want to check the returned data for currentUser.email and only grant access to users with emails from 2 specific domains. I've read the docs and attempted changing the signin action with no luck. Not sure the best way to handle this.

index.hbs

<div class="container">
    <div class="row">
      <div class="col-md-8 col-md-offset-2 text-center">
        <h1 class="welcomeHeading">WELCOME TO UTILITY BELT</h1>
        <div>
          <p class="lead flash-msg"></p>
        </div>  
        <div>
          
            <span>Currently logged in as </span><br/> 
            <a class="btn btn-md btn-danger signout" >Sign out</a>
          
            <a  class="btn btn-danger btn-md">Click to Sign In </a>
            
        </div>
      </div>  
    </div>
</div>

application.js route file

import Ember from 'ember';

export default Ember.Route.extend({  
    beforeModel: function() {
    return this.get('session').fetch().catch(function() {
    });
  },

  actions: {  
        signIn: function(provider) {
        this.get('session').open('firebase', {
            provider: provider
        }).then(function(data) {
            if(data.currentUser.email.indexOf('domain1') < 0 & data.currentUser.email.indexOf('domain2') < 0){
                let correctDomain = false;
                return correctDomain;
            }else{
                let correctDomain = true;
                return correctDomain;
            }
        });
        },

        signOut: function() {
        this.get('session').close();
        },
    }
});