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Angular 2 Authguard Service With Redirect

Are you looking to enhance the security of your Angular 2 applications with a robust AuthGuard service that can handle redirects efficiently? In this guide, we'll walk you through the process of setting up an AuthGuard service in your Angular 2 project and implementing redirection based on the authentication state of your users.

## Understanding AuthGuard Service in Angular 2

AuthGuard is a key feature in Angular that allows you to control access to specific routes in your application based on the authentication status of a user. By using an AuthGuard service, you can prevent unauthorized users from accessing certain parts of your application, ensuring a secure user experience.

## Setting Up the AuthGuard Service

To set up an AuthGuard service in your Angular 2 project, you first need to create a new service using the Angular CLI. Open your terminal and run the following command:

Bash

ng generate service auth-guard

This command will create a new service file named `auth-guard.service.ts` in your Angular project. Inside this service file, you can define the logic for handling the authentication status and redirecting users as needed.

## Implementing the Authentication Logic

In the `auth-guard.service.ts` file, you can implement the necessary logic to check the authentication status of the user. You can use services like authentication services or token storage services to determine whether a user is authenticated or not.

Here is an example of how you can implement the `canActivate` method in your AuthGuard service:

Typescript

import { Injectable } from '@angular/core';
import { CanActivate, Router } from '@angular/router';

@Injectable({
  providedIn: 'root'
})
export class AuthGuardService implements CanActivate {

  constructor(private router: Router) {}

  canActivate(): boolean {
    if (/* Check if user is authenticated */) {
      return true;
    } else {
      this.router.navigate(['/login']);
      return false;
    }
  }
}

In this example, if the user is not authenticated, the `canActivate` method will redirect the user to the login page. You can customize this logic based on your application's requirements.

## Implementing Redirection

Once you have set up the AuthGuard service and implemented the authentication logic, you can now apply the AuthGuard to specific routes in your Angular 2 application. You can do this by adding the AuthGuard to the `canActivate` property of the route in your routing module.

Here is an example of how you can apply the AuthGuard to a route:

Typescript

const routes: Routes = [
  { path: 'dashboard', component: DashboardComponent, canActivate: [AuthGuardService] }
];

In this example, the `DashboardComponent` route will only be accessible to authenticated users due to the `canActivate` property being set to the `AuthGuardService`.

## Conclusion

By setting up an AuthGuard service in your Angular 2 project and implementing redirection based on the authentication status of your users, you can enhance the security of your applications and provide a better user experience. Remember to customize the authentication logic and redirection behavior according to your application's specific requirements.

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