protected Flowable<IProfile> isUserAuthorized() {
        return Flowable.create(new FlowableOnSubscribe<IProfile>() {
            @Override
            public void subscribe(FlowableEmitter<IProfile> e) throws Exception {
                if (mAuth.getCurrentUser() == null) {
                    e.onError(new UnauthorizedError());
                } else {
                    FirebaseUser user = mAuth.getCurrentUser();
                    if (user.isEmailVerified()) {
                        Profile profile = new Profile(
                                BaseApi.this,
                                user.getUid(),
                                user.getEmail(),
                                user.getDisplayName());
                        e.onNext(profile);
                    } else {
                        e.onError(new EmailIsNotVerifiedError(user.getEmail()));
                    }
                }
                e.onComplete();
            }
        }, BackpressureStrategy.MISSING);
    }