Sign In with Apple on Firebase Authenticate users into your Firebase app using Sign In with Apple on the web 480 words. By Jeff Delaney Created Feb 9, 2020 Last Updated Apr 20, 2020 Slack #auth #ios #javascript Sign in with Apple was announced in 2019 and allows users to authenticate into your Firebase app with an Apple ID. Users must have two-factor authentication (2FA) enabled on their Apple account AND be signed into iCloud. The following lesson demonstrates how to configure Apple SignIn with the Firebase JavaScript SDK (web). 🚨 As of April 2020, all native iOS apps that offer social auth methods (Google, Facebook, etc.) MUST also include Apple Sign In as an option. See the detailed guideline. If you’re looking for Flutter, check out this Sign In with Apple on Flutter section from the full course. Sign in with Apple Setup (Web) Follow the steps outlined below to implement Sign In with Apple in your web app. Step 1 - Create or Update an App ID From the Apple Developer Portal go to Certificates, Identifiers & Profiles » Identifiers. Create a new App ID or update an existing app and give it the Sign In with Apple capability. Make sure Sign In with Apple is Enabled Step 2 - Create and Configure a Service ID From Certificates, Identifiers & Profiles » Identifiers, create a new Service ID and make sure is linked to your primary App ID. Configure it point to your Firebase hosting URL. Replace the project ID for your domain Step 3 - Verify Domain Ownership Go to Service ID you created in the previous step and click configure, then click download. Save the file in your web app’s public hosting directory under ./well-known/. Deploy this file to your domain so Apple can verify it. command line firebase deploy --only hosting You should see a green checkmark next to the domain Step 4 - Register a Private Key From Certificates, Identifiers & Profiles » Identifiers, create and download a new private key - keep it private. It is used to validate requests from Apple with your Firebase project. Download the private key. Do not expose it publicly. Step 5 - Enable SignIn Method on Firebase Head over the to the Firebase Console and go to the Authentication » Sign-in Method tab. Enable Apple and enter the required details. Copy the contents of the private key in the console Frontend Code We now have all the pieces in place to implement SignIn with Apple into our web app. Because this is Firebase, it only requires a few lines of code. Assuming you have Firebase installed in your project, simply make a reference the the provider and call signInWithPopup(). SignIn with Apple popup seen by the end-user Basic JavaScript Implementation The frontend implementation is an async function that can bound to a button click to trigger the popup modal. Make sure to follow Apple UI guidelines when designing the button. file_type_js_official app.js const auth = firebase.auth(); async signInWithApple() { const provider = new firebase.auth.OAuthProvider('apple.com'); const result = await auth.signInWithPopup(provider); console.log(result.user); // logged-in Apple user }