+import { Injectable } from '@angular/core';
+import { Router, CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
+
+import { AuthenticationService } from './../_services/authentication.service';
+
+@Injectable({ providedIn: 'root' })
+
+export class AuthGuard implements CanActivate {
+
+ constructor(
+ private router: Router,
+ private authenticationService: AuthenticationService
+ ) { }
+
+ canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
+ const currentUser = this.authenticationService.currentUserValue;
+
+ console.log("current user");
+ console.log(currentUser);
+
+ if (currentUser) {
+ // authorised so return true
+ return true;
+ }
+
+ // not logged in so redirect to login page
+ this.router.navigate(['/login'], { queryParams: { returnUrl: state.url } });
+ return false;
+ }
+
+}
\ No newline at end of file