How do I lock down Firebase Database to any user from a specific (email) domain?

Question

I have a small, personal Firebase webapp that uses Firebase Database. I want to secure (lock down) this app to any user from a single, specific domain. I want to authenticat

Answer 1

For anyone really not wanting to have unverified accounts logging in. Maybe dirty, but very effective.

This is my workaround (Angular app):

this.userService.login(this.email.value, this.password.value).then(data => {
  if (data.user.emailVerified === true) {
    //user is allowed
  } else {
    //user not allowed, log them out immediatly
    this.userService.logout();
  }
}).catch(error => console.log(error));