How do I implement authentication guards in Angular CLI?

How do I implement authentication guards in Angular CLI?

To implement authentication guards in Angular CLI, you can create a guard using the Angular CLI command: ng generate guard auth. This will generate a guard file where you can define your authentication logic.

What are the different types of guards I can create?

You can create several types of guards: CanActivate, CanActivateChild, CanDeactivate, Resolve, and CanLoad. Each serves a different purpose in route protection.

Can you show me an example of a CanActivate guard?

Sure! Here's a simple example:

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

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

  canActivate(
    next: ActivatedRouteSnapshot,
    state: RouterStateSnapshot): boolean {
    if (this.authService.isLoggedIn()) {
      return true;
    }
    this.router.navigate(['/login']);
    return false;
  }
}

This guard checks if the user is logged in before allowing access to a route.

How do I apply this guard to a route?

You can apply the guard in your routing module like this:

const routes: Routes = [
  { path: 'protected', component: ProtectedComponent, canActivate: [AuthGuard] },
];

This ensures that the AuthGuard is checked before accessing the protected route.