init middleware setup

.gitignore

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+node_modules

README.md

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+# Express Firebase Middleware
+
+Express middleware for your Firebase applications.
+
+## How to use
+1. Install the packages using npm
+    ```
+    npm install express firebase-admin express-firebase-middleware
+    ```
+
+   Both `express` and `firebase-admin` are peerDependencies.
+
+2. Require it in your express routes
+    ```
+    var firebaseMiddleware = require('express-firebase-middleware');
+
+    router.use('/api', firebaseMiddleware.auth);
+    ```
+
+3. Now make sure the client's requests have Authorization header like
+    ```
+    Authorization Bearer <your-client-token>
+    ```
+
+    The client can get the token from their client SDK (Web, Android, iOS Firebase SDK)
+
+4. When requesting, and token is valid, you can get the `user` object from response
+    ```
+    router.get('/api/hello', (req, res) => {
+        res.json({
+            message: `You're logged in as ${res.locals.user.email} with Firebase UID: ${res.locals.user.uid}`
+        });
+    });
+    ```
+
+## Debug mode
+By default, the middleware will log and output to console, you can disable them by setting
+your environment variable for `APP_DEBUG` to `false`
+
+## License
+MIT

index.js

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+var auth = require('./src/auth.middleware');
+
+module.exports = {
+    auth
+};

package.json

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+{
+  "name": "express-firebase-middleware",
+  "version": "0.1.0",
+  "description": "Express middleware for your Firebase applications",
+  "main": "index.js",
+  "scripts": {
+    "test": "echo \"Error: no test specified\" && exit 1"
+  },
+  "repository": {
+    "type": "git",
+    "url": "git+https://github.com/antonybudianto/express-firebase-middleware.git"
+  },
+  "keywords": [
+    "express",
+    "firebase",
+    "middleware",
+    "auth"
+  ],
+  "author": "Antony Budianto <antonybudianto@gmail.com>",
+  "license": "MIT",
+  "bugs": {
+    "url": "https://github.com/antonybudianto/express-firebase-middleware/issues"
+  },
+  "homepage": "https://github.com/antonybudianto/express-firebase-middleware#readme",
+  "peerDependencies": {
+    "express": "^4.14.0",
+    "firebase-admin": "^4.0.4"
+  }
+}

src/auth.middleware.js

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+var admin = require.main.require('firebase-admin');
+
+var logger = require('./util/logger');
+
+function firebaseAuthMiddleware(req, res, next) {
+    let authorization = req.header('Authorization');
+    if (authorization) {
+        let token = authorization.split(' ');
+        admin.auth().verifyIdToken(token[1])
+        .then((decodedToken) => {
+            logger.log(decodedToken);
+            res.locals.user = decodedToken;
+            next();
+        })
+        .catch(err => {
+            logger.log(err);
+            res.sendStatus(401);
+        });
+    } else {
+        logger.log('Authorization header is not found');
+        res.sendStatus(401);
+    }
+}
+
+module.exports = firebaseAuthMiddleware;

src/util/logger.js

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+var debug = process.env.APP_DEBUG || true;
+
+function log() {
+    if (!debug) return;
+
+    console.log.apply(null, arguments);
+}
+
+module.exports = {
+    log
+};