Angular 5 role based routing

Tutorial Link in the @andrea06590 answer has very brief overview for Authentication and Authorization based routing. In a short way , someone can use the following way:

1. Use canActivate property and pass it a service class which implements CanActivate Interface.
2. use data object property to pass the role to AuthGuard service.

app.routing.module.ts

import { NgModule } from '@angular/core';
import { Routes, RouterModule } from '@angular/router';
const routes: Routes = [
  { path : ''  , redirectTo : '', pathMatch: 'full' , canActivate : [ RedirectGuardService ] },
  { path : 'admin' , component : AdminComponent , canActivate : [AuthGuardService] , data : { role : 'admin'}},
  { path : 'user' , component : UserComponent , canActivate : [AuthGuardService] , data : { role : 'user'}}
  { path : '**' , component : NotFoundComponent }
];
@NgModule({
  imports: [RouterModule.forRoot(routes)],
  exports: [RouterModule]
})
export class AppRoutingModule { }

auth-guard.service.ts

import { Injectable } from '@angular/core';
import { Router , CanActivate, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { Observable } from 'rxjs';
import { AuthService } from '../auth-service/auth-service.service';

@Injectable({
  providedIn: 'root'
})
export class AuthGuardService implements CanActivate {
  constructor(
      private router: Router,
      private authService: AuthService
  ) {}

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) : Observable<boolean> | Promise<boolean> | boolean {
    const currentUser = this.authService.userVal; // Getting User Value by decoding JWT Token
    const role        = route.data.role; // Getting role value which we passed to data object in router configuration
    if (currentUser) {      
      if(role && role.indexOf(currentUser.role) > -1)
        return true;          
      else 
        return false;          
    }
    return false;
  }
}

redirect-guard.service.ts

import { Injectable } from '@angular/core';
import { CanActivate, Router, ActivatedRouteSnapshot, RouterStateSnapshot } from '@angular/router';
import { AuthService } from '../auth-service/auth-service.service';
import { Observable } from 'rxjs';
import { IUser } from 'client/app/interfaces';

@Injectable({
  providedIn: 'root'
})
export class RedirectGuardService implements CanActivate {
  constructor(
      private router: Router,
      private authService: AuthService
  ) {}

  canActivate(route: ActivatedRouteSnapshot, state: RouterStateSnapshot) : Observable<boolean> | Promise<boolean> | boolean {
    const user = <IUser>this.authService.userVal;
    if (user && user['user']) {      
      this.router.navigate(['/'+ user['user'].role]);
      return true;      
    }      
    this.router.navigate(['/login'], { queryParams: { returnUrl: state.url }});
    return false;
  }
}