angular-cn/public/docs/_examples/router/ts/app/auth-guard.service.2.ts

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// #docregion
import { Injectable } from '@angular/core';
import { CanActivate, Router,
ActivatedRouteSnapshot,
RouterStateSnapshot } from '@angular/router';
import { AuthService } from './auth.service';
@Injectable()
export class AuthGuard implements CanActivate {
constructor(private authService: AuthService, private router: Router) {}
canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) {
if (this.authService.isLoggedIn) { return true; }
// Store the attempted URL for redirecting
this.authService.redirectUrl = state.url;
// Navigate to the login page
this.router.navigate(['/login']);
return false;
}
}