Authenticating Firebase and Angular with Auth0: Part 1

(This article, originally published on Auth0.com, is reprinted with permission.)

This two-part tutorial demonstrates building a secure application using Auth0 for authentication, a Node.js backend, and an Angular frontend. The application will also securely authenticate with a Firebase Cloud Firestore database using custom tokens, enabling users to post real-time comments after logging in via Auth0.

The Angular application code is available on GitHub at angular-firebase, and the Node API is at firebase-auth0-nodeserver.

Part 1: Securing Firebase and Angular with Auth0

This tutorial covers:

1. Firebase and Auth0 Overview
2. Application Overview
3. Angular CLI Setup
4. Auth0 Client and API Configuration
5. Firebase Project and Service Account Setup
6. Node API Development
7. Angular App Setup
8. Angular App Architecture
9. Implementing Shared Modules
10. Implementing Routing and Lazy Loading
11. Loading and Error Components
12. Authentication Logic
13. Core Application Logic
14. Next Steps

Firebase and Auth0: A Synergistic Approach

Firebase, a Google-owned platform, offers cloud-hosted NoSQL databases (Realtime Database and Cloud Firestore) with real-time capabilities. Auth0 is a cloud-based platform providing authentication and authorization as a service, simplifying the implementation of secure login and authorization in applications.

Why Auth0 with Firebase?

While Firebase offers built-in authentication, integrating Auth0 with custom tokens provides several advantages:

Use Firebase's built-in authentication if:

• You only need to authenticate Firebase databases (RTDB or Firestore) and no other backends.
• You require only a few login options and don't need enterprise identity providers or custom user databases.
• Minimal user management is needed.
• Authentication flow customization isn't required.
• Compliance regulations regarding user data storage are not a concern.

Consider Auth0 with custom Firebase tokens if:

• You already use Auth0 and want to add real-time features.
• You need to secure a non-Firebase backend.
• You need social or enterprise identity providers (Active Directory, LDAP, etc.).
• A customized authentication flow is necessary.
• Robust user management with APIs and a dashboard is required.
• Dynamic user profile enrichment is needed.
• Features like passwordless login or multi-factor authentication are desired.
• Compliance regulations (HIPAA, GDPR, etc.) must be met.

Application Overview: Popular Dogs

This tutorial builds a Node.js API (secured by Auth0) that mints Firebase custom tokens and returns data on dog breeds. An Angular frontend ("Popular Dogs") displays information about popular dog breeds, secured by Auth0. The app fetches dog data and Firebase tokens from the API, allowing users to add/delete real-time comments in Cloud Firestore. The app utilizes shared modules and lazy loading.

Prerequisites:

• Angular CLI
• A free Auth0 account with a configured client and API
• A free Firebase project with a service account

(The remainder of the tutorial details setting up the Angular CLI, Auth0 client and API, the Firebase project, the Node API, the Angular app architecture, shared modules, routing, lazy loading, components, authentication logic, and core application logic, similar to the original article. Due to the length, it's not feasible to reproduce the entire code here. Refer to the provided GitHub links for complete code examples.)

Conclusion:

This first part establishes the foundation. Part 2 will cover displaying dog data and implementing real-time comments with Firebase. Additional resources on testing, Firebase, Auth0, and Angular are linked in the original article.

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