auth.guard.ts
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	import { Injectable } from '@angular/core';
	import { Router, CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
	import { AuthenticationService } from '../_services';

	// Authentication guard -> manage authentication and redirect if not connected
	@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;
	if (currentUser) {
	// authorised so return true
	return true;
	}

	// not logged in so redirect to login page with the return url
	this.router.navigate(['/login'], { queryParams: { returnUrl: state.url }});
	return false;
	}
	}