FirebaseServerApp (#366)

* First.

* already snippets for that

* cleanup

* auth_svc_admin

* Auth, not auth-next

* Express stub should not be in snippet

* Move import into snippet

* Update firebaseserverapp.js

Author: jamesdaniels

auth/package.json

@@ -7,6 +7,7 @@
   "license": "Apache 2.0",
   "dependencies": {
     "firebase": "^8.10.0",
+    "firebase-admin": "^12.0.0",
     "firebaseui": "^5.0.0"
   }
 }

auth/service-worker-sessions.js

@@ -162,3 +162,46 @@ function svcSignInEmail(email, password) {
     });
   // [END auth_svc_sign_in_email]
 }
+
+function svcRedirectAdmin() {
+  const app = { use: (a) => {} };
+
+  // [START auth_svc_admin]
+  // Server side code.
+  const admin = require('firebase-admin');
+
+  // The Firebase Admin SDK is used here to verify the ID token.
+  admin.initializeApp();
+
+  function getIdToken(req) {
+    // Parse the injected ID token from the request header.
+    const authorizationHeader = req.headers.authorization || '';
+    const components = authorizationHeader.split(' ');
+    return components.length > 1 ? components[1] : '';
+  }
+
+  function checkIfSignedIn(url) {
+    return (req, res, next) => {
+      if (req.url == url) {
+        const idToken = getIdToken(req);
+        // Verify the ID token using the Firebase Admin SDK.
+        // User already logged in. Redirect to profile page.
+        admin.auth().verifyIdToken(idToken).then((decodedClaims) => {
+          // User is authenticated, user claims can be retrieved from
+          // decodedClaims.
+          // In this sample code, authenticated users are always redirected to
+          // the profile page.
+          res.redirect('/profile');
+        }).catch((error) => {
+          next();
+        });
+      } else {
+        next();
+      }
+    };
+  }
+
+  // If a user is signed in, redirect to profile page.
+  app.use(checkIfSignedIn('/'));
+  // [END auth_svc_admin]
+}

firebaseserverapp-next/firebaseserverapp.js

@@ -0,0 +1,27 @@
+// @ts-nocheck
+// [START serverapp_auth]
+import { initializeServerApp } from 'firebase/app';
+import { getAuth } from 'firebase/auth';
+import { headers } from 'next/headers';
+import { redirect } from 'next/navigation';
+
+export default function MyServerComponent() {
+
+    // Get relevant request headers (in Next.JS)
+    const authIdToken = headers().get('Authorization')?.split('Bearer ')[1];
+
+    // Initialize the FirebaseServerApp instance.
+    const serverApp = initializeServerApp(firebaseConfig, { authIdToken });
+
+    // Initialize Firebase Authentication using the FirebaseServerApp instance.
+    const auth = getAuth(serverApp);
+
+    if (auth.currentUser) {
+        redirect('/profile');
+    }
+
+    // ...
+}
+// [END serverapp_auth]
+
+const firebaseConfig = {};

firebaseserverapp-next/package.json

@@ -0,0 +1,12 @@
+{
+  "name": "firebaseserverapp-next",
+  "version": "1.0.0",
+  "scripts": {
+    "compile": "cp ../tsconfig.json.template ./tsconfig.json && tsc"
+  },
+  "license": "Apache-2.0",
+  "dependencies": {
+    "firebase": "^10.0.0",
+    "next": "^14.1.3"
+  }
+}