Flutter Web/Firebase - Pressing back in browser bypasses verification process - firebase

Question

When my user signs up I direct them to a page to inform them that they need to verify their email before continuing:
Here is my verification screen code:
class VerifyScreen extends StatefulWidget {
#override
_VerifyScreenState createState() => _VerifyScreenState();
}
class _VerifyScreenState extends State<VerifyScreen> {
final auth = FirebaseAuth.instance;
User user;
Timer timer;
#override
void initState() {
user = auth.currentUser;
user.sendEmailVerification();
timer = Timer.periodic(
Duration(seconds: 5),
(timer) {
checkEmailVerified();
},
);
super.initState();
}
#override
void dispose() {
timer.cancel();
super.dispose();
}
#override
Widget build(BuildContext context) {
return Scaffold(
body: Center(
child: Container(
height: MediaQuery.of(context).size.height * 0.8,
width: MediaQuery.of(context).size.width * 0.8,
child: Text(
"An email has been sent to ${user.email} please verify before proceeding"),
),
),
);
}
Future<void> checkEmailVerified() async {
user = auth.currentUser;
await user.reload();
if (user.emailVerified) {
Navigator.of(context).pushReplacement(
MaterialPageRoute(
builder: (context) => OurHomePage(),
),
);
timer.cancel();
}
}
}
Problem Statement: When I press the back arrow on my chrome browser:
I get returned to my homepage with the user signed in which I don't want. I would like my user to verify their email before being able to continue. Here's the drawer on my homepage after I press the back button without verifying the email:
I use provider to pass my user object around my app. Here is my main.dart:
void main() async {
WidgetsFlutterBinding.ensureInitialized();
await Firebase.initializeApp();
runApp(
MultiProvider(
providers: [
Provider(
create: (_) => FirebaseAuthService(),
),
StreamProvider<OurUser>(
create: (context) =>
context.read<FirebaseAuthService>().onAuthStateChanged),
],
child: MaterialApp(theme: OurTheme().buildTheme(), home: OurHomePage()),
),
);
}
I then user Consumer to consume that provider on my Homepage:
class OurHomePage extends StatefulWidget {
#override
_OurHomePageState createState() => _OurHomePageState();
}
class _OurHomePageState extends State<OurHomePage> {
#override
Widget build(BuildContext context) {
return Consumer<OurUser>(
builder: (_, user, __) {
return ChangeNotifierProvider<SignInViewModel>(
create: (_) => SignInViewModel(context.read),
builder: (_, child) {
return Scaffold(appBar: AppBar(title: Text("My Homepage")));
},
);
},
);
}
}
Can anyone help me resolve the issue I'm facing? Thanks in advance.

Answer 1

On homepage check if user is logged in and when is, check if he has verified email. If he has, let him in, otherwise show him some message.