I guess it's quite simple issue, but unfortunately I don't really know how to deal with it.
I'm trying to connect my UserAuthenticationService service with the ActivationGuard.
UserAuthenticationService.ts:
import {Injectable} from '@angular/core';
import {Http} from '@angular/http';
@Injectable()
export class UserAuthenticationService {
isUserAuthenticated: boolean = false;
username: string;
constructor(private http: Http) {
}
authentication() {
this.http.get(`http://localhost/api/auth/isLogged/${this.username}`)
.subscribe(res => { //^^returns true or false, depending if the user is logged or not
this.isUserAuthenticated = res.json();
},
err => {
console.error('An error occured.' + err);
});
}
}
ActivationGuard.ts
import {Injectable} from '@angular/core';
import {Router, RouterStateSnapshot, ActivatedRouteSnapshot} from '@angular/router';
import {Observable} from 'rxjs/Observable';
import {UserAuthenticationService} from './UserAuthenticationService';
interface CanActivate {
canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): Observable<boolean>|Promise<boolean>|boolean
}
@Injectable()
export class WorksheetAccessGuard implements CanActivate {
constructor(private router: Router, private userService: UserAuthenticationService) {
}
public canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
if (this.userService) {
this.router.navigate(['/']);
return false;
}
return true;
}
}
It works great, if I just use localStorage to store the information if the user is logged or not:
public canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
if (!localStorage.getItem('currentUser')) {
this.router.navigate(['/']);
return false;
}
return true;
}
But how can I connect the service with the guard? Looking forward for any kind of help. Thank you in advance.
If you need any more information, please let me know and I will edit my post.
Call authentication() method of UserAuthenticationService either in constructor or On ngOnit then it sets the isUserAuthenticated variable and use that in the ActivationGuard.ts
UserAuthenticationService.ts:
import {Injectable} from '@angular/core';
import {Http} from '@angular/http';
@Injectable()
export class UserAuthenticationService {
isUserAuthenticated: boolean = false;
username: string;
constructor(private http: Http) {
this.authentication();
}
authentication() {
this.http.get(`http://localhost/api/auth/isLogged/${this.username}`)
.subscribe(res => { //^^returns true or false, depending if the user is logged or not
this.isUserAuthenticated = res.json();
},
err => {
console.error('An error occured.' + err);
});
}
}
ActivationGuard.ts
@Injectable()
export class WorksheetAccessGuard implements CanActivate {
constructor(private router: Router, private userService: UserAuthenticationService) {
}
public canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot): boolean {
if (this.userService.isUserAuthenticated) {
this.router.navigate(['/']);
return false;
}
return true;
}
}
This is not the right approach for doing it. Every time you call the service , it initialize a new instance and hence you get a false.
You should create a singleton service instance ( via the main module in your app) - where it will contain your app state ( in memory / localstorage)
Then , when you'll call UserAuthenticationService - you won't update its owbn parameter but the main's one ( the singleton).
I suggest you to use a BehaviourSubject ( read about it , it's like a Subject but it also yields its last value without waiting to emit a value manually).
From that point your app can see from anywhere ig the user is logged in or not.