starter-fe/src/app/guards/authentication.guard.ts

import { Injectable } from '@angular/core';
import {
  ActivatedRouteSnapshot,
  CanActivate,
  CanActivateChild,
  CanDeactivate,
  CanLoad,
  Route,
  Router,
  RouterStateSnapshot,
  UrlSegment,
  UrlTree
} from '@angular/router';
import { Observable } from 'rxjs';
import { UserService } from '../services/auth/user.service';
import {RoutePath} from "../enum/route-path";

@Injectable({
  providedIn: 'root'
})
export class AuthenticationGuard implements CanActivate, CanActivateChild, CanDeactivate<unknown>, CanLoad {

  constructor(
    private userService: UserService,
    private router: Router,
  )
  {

  }

  canActivate(
    route: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    if (this.userService.getAuthToken() !== null && this.userService.getAuthToken() !== undefined){
      return true;
    }
    return this.router.createUrlTree([RoutePath.LOGIN]);
  }
  canActivateChild(
    childRoute: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    return true;
  }
  canDeactivate(
    component: unknown,
    currentRoute: ActivatedRouteSnapshot,
    currentState: RouterStateSnapshot,
    nextState?: RouterStateSnapshot): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    return true;
  }
  canLoad(
    route: Route,
    segments: UrlSegment[]): Observable<boolean | UrlTree> | Promise<boolean | UrlTree> | boolean | UrlTree {
    return true;
  }
}