import { Injectable } from '@angular/core';
import { HttpClient } from '@angular/common/http';

@Injectable()
export class AuthService {

    public isAuthenticated = false;

    constructor(private http: HttpClient) {
    }

    setUserLoggedIn() {
        this.isAuthenticated = true;
    }

    getUserLoggedIn() {
        return this.isAuthenticated;
    }

    public setAuthenticated() {

        this.http
            .get<any>(url, {withCredentials: true, observe: 'response'})
            .subscribe(
                (res) => {
                    console.log('Status: Authenticated: ' + res.headers.get('status') );
                    if ( res.headers.get('status') === '200') {
                        this.setUserLoggedIn();
                    }
                },
                err => {});
    }
}

import { Injectable } from '@angular/core';
import { CanActivate,
         ActivatedRouteSnapshot,
         RouterStateSnapshot,
         Router,
         ActivatedRoute} from '@angular/router';
import { Observable } from 'rxjs/Observable';
import { HttpClient } from '@angular/common/http';
import { AuthService } from './service/auth.service';


@Injectable()
export class AuthguardGuard implements CanActivate {
    constructor(
        private user: AuthService,
        public router: Router,
        private http: HttpClient,
        private activatedRoute: ActivatedRoute) {
    }

    canActivate( route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean> | Promise<boolean> | boolean {

        if ( !this.user.isAuthenticated ) {
            console.log('Not authenticated!');
            this.router.navigate(['userLogin']);
            return false;
        }
        return true;
    }
}