To implement Single Sign-On (SSO) across multiple Angular applications, follow these steps:
1. Choose an SSO protocol: Select a suitable SSO protocol like OAuth2, OpenID Connect, or SAML to facilitate secure communication between the client and server.
2. Set up Identity Provider (IdP): Configure an IdP such as Okta, Auth0, or Keycloak that manages user authentication and authorization centrally for all connected applications.
3. Integrate Angular apps with IdP: Install appropriate libraries (e.g., angular-oauth2-oidc for OAuth2/OpenID Connect) in each Angular application and configure them to communicate with the chosen IdP.
4. Implement login flow: In each Angular app, create a login component that redirects users to the IdP’s login page. Upon successful authentication, the IdP returns an access token to the Angular app.
5. Handle tokens: Store the received access token securely (e.g., HttpOnly cookies or browser sessionStorage). Use an interceptor to attach the token to API requests for authorized access.
6. Manage session state: Monitor token expiration and refresh it when necessary. Implement logout functionality by revoking the token at the IdP and clearing it from the Angular app storage.
