added folders to organize files

functions/util/fbAuth.js

@@ -0,0 +1,28 @@
+const { admin, db } = require('./admin');
+
+module.exports = (req, res, next) => {
+    let idToken;
+    if (req.headers.authorization) {
+        idToken = req.headers.authorization;
+    } else {
+        console.error('No token found');
+        return res.status(403).json({ error: 'Unauthorized'});
+    }
+
+    admin.auth().verifyIdToken(idToken)
+        .then((decodedToken) => {
+            req.user = decodedToken;
+            return db.collection('users').where('userId', '==', req.user.uid)
+            .limit(1)
+            .get();
+        })
+        .then((data) => {
+            req.user.handle = data.docs[0].data().handle;
+            req.user.imageUrl = data.docs[0].data().imageUrl;
+            return next();
+        })
+        .catch((err) => {
+            console.error('Error while verifying token ', err);
+            return res.status(403).json(err);
+        });
+};