firebase authentication - Refresh page get log out automatically in angular 5

Question

I'm using firebase for the signIn and signup. that is my authService look like :

token: string;
authenticated: boolean = false;
signinUser(email: string, password: string) {
        firebase
            .auth()
            .signInWithEmailAndPassword(email, password)
            .then(response => {
                this.authenticated = true;
                console.log('authService-->signinUser-->authenticated', this.authenticated);


                //Set the a wallet using a combination of the email and the name of the network e.g. Majd@gmail.com@stschain
                this.dataService.setWallet(`${email}${this.domainExtenstion}`);
                this.setEmail(email);
                this.router.navigate(['/dashboard']);
                console.log('sinign in')
                firebase
                    .auth()
                    .currentUser.getIdToken()
                    .then(
                        (token: string) => {
                            (this.token = token);
                            // localStorage.setItem('token', JSON.stringify(token));
                        }
                    );
            })
            .catch(error => {
                console.log(error);
                alert(error);
            });

    }

isAuthenticated() {
   return this.token != null;       
}

and in my authGuardService im calling canactivate methode like this :

canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
    if (!this.authService.authenticated) {
      console.log('cant load' )
      this.router.navigate(['/signin']);
    }
    console.log('can load' )
    return this.authService.isAuthenticated();
  }
}

but when i refresh the page this authenticated value get false always.

Please, anyone, know the cause that will appreciate.

Answer 1

Waitting for answers