Google Cloud Functions & Firebase Serverless Demo

This demo shows how to set up the basics of a serverless Firebase application that uses Firebase Authentication, Hosting, and Google Cloud Functions.

The Function with code code in the functions directory demonstrates a Cloud Function protected by Firebase Authentication and responds with a simple 'Hello '. Only users who pass a valid Firebase ID token as a Bearer token in the Authorization header of the HTTP request or in a __session cookie are authorized to use the Cloud Function. Checking the ID token is done with an ExpressJs middleware.

The Hosting site with code in the public directory lets you sign-in with Google Authentication and initiates the authorized call to the Function.

Setting up the sample

1. Create a Firebase Project using the Firebase Console.
2. Enable the Google Provider in the Auth section.
3. Ensure that the Support Email within the Firebase Project Settings is configured, or authentication will fail with a 'restricted_client' error.
4. Clone or download this repo.
5. You must have the Firebase CLI installed. If you don't have it install it with npm install -g firebase-tools and then configure it with firebase login.
6. Configure the CLI locally by using firebase use --add and select your project in the list.
7. Install dependencies locally by running: cd functions; npm install; cd -

Deploy and test

To test locally do:

1. Start serving your project locally using firebase serve --only hosting,functions
2. Open the app in a browser at http://localhost:5000.
3. Sign in the web app in the browser using Google Sign-In and two authenticated requests will be performed from the client and the result will be displayed on the page, normally "Hello ".

To deploy and test on prod do:

1. Deploy your project using firebase deploy
2. Open the app using firebase open hosting:site, this will open a browser.
3. Sign in the web app in the browser using Google Sign-In and two authenticated requests will be performed from the client and the result will be displayed on the page, normally "Hello ".

Acknowledgements

The code within this repository utilizes sample code from: firebase / functions-samples / authorized-https-endpoint