AngularJS ui-router Login Authentication: Integrating Multiple Sections

Question:

Suppose you have an AngularJS application with two sections: a homepage with login and signup functionality, and a dashboard accessible after successful login. Now, you want to combine these sections with their respective Angular apps. How can you redirect the 'home app' to the 'dashboard app' upon successful login?

Solution:

1. Identity Management with 'Principal' Service:

Create a service named 'principal' to manage user identity. This service will resolve user information and perform role checks.

2. Authorization with 'Authorization' Service:

Implement an 'authorization' service that checks the user's intended destination state. If they are not logged in, redirect them to the sign-in page. If they are authenticated but don't have the required role(s), send them to an access denied page.

3. State Change Monitoring:

Use Angular-UI router's $stateChangeStart event to intercept state changes. Check if the user is authorized for the requested state. If they're not, cancel the transition or redirect them accordingly.

4. Identity Resolution in Resolve Hook:

Ensure that user identity is resolved before authorization checks. Use the 'resolve' hook in ui-router state configuration to do this.

5. Combining Sections:

Create a parent state for the entire application called 'site,' where you can force identity resolution through the 'resolve' hook. This parent state should abstract away the following:

<code class="javascript">$stateProvider.state('site', {
  'abstract': true,
  resolve: {
    authorize: ['authorization',
      function(authorization) {
        return authorization.authorize();
      }
    ]
  },
  template: '<div ui-view></div>'
})</code>

6. State-Based Authorization:

Define state configurations with 'data.roles' to restrict access based on user roles. For example, to restrict a resource to admins, use:

<code class="javascript">.state('restricted', {
    parent: 'site',
    url: '/restricted',
    data: {
      roles: ['Admin']
    },
    views: {
      'content@': {
        templateUrl: 'restricted.html'
      }
    }
  })</code>

7. Conditional Display in Views:

Inject 'principal' into controllers to check login status and control template display. For instance:

<code class="html"><div ng-show="principal.isAuthenticated()">
  I'm logged in
</div></code>

By following these steps, you can seamlessly integrate multiple sections of your application, enforce user authentication, and control access based on roles.

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