Simplifying the authorized-https-endpoint sample since default credentials can be used now

Change-Id: Ic0ab9d53a1ef48c4773730511390937c200044ca

Author: Nicolas Garnier

Diff for: authorized-https-endpoint/README.md

@@ -17,8 +17,6 @@ This sample comes with a simple web-based UI which code is in [public](public) d
  1. Enable the **Google** Provider in the **Auth** section.
  1. Clone or download this repo and open the `authenticated-https-endpoint` directory.
  1. Paste the Web initialization snippet from: **Firebase Console > Overview > Add Firebase to your web app** in the `public/index.html` where the `TODO` is located.
- 1. Download a Service Account credentials from: **Firebase Console > ⚙ > Project Settings > SERVICE ACCOUNTS > GENERATE NEW PRIVATE KEY** and save the file as `functions/service-account.json`.
- 1. Configure the CLI locally by using `firebase use --add` and select your project in the list.
  1. 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`.
  1. Configure the CLI locally by using `firebase use --add` and select your project in the list.
  1. Install dependencies locally by running: `cd functions; npm install; cd -`

Diff for: authorized-https-endpoint/functions/index.js

@@ -17,11 +17,7 @@
 
 const functions = require('firebase-functions');
 const admin = require('firebase-admin');
-const credentials = require('./service-account.json');
-admin.initializeApp({
-  credential: admin.credential.cert(credentials),
-  databaseURL: `https://${credentials.project_id}.firebaseio.com`
-});
+admin.initializeApp(functions.config().firebase);
 const express = require('express');
 const cors = require('cors')({origin: true});
 const app = express();

Diff for: authorized-https-endpoint/functions/package.json

@@ -4,7 +4,7 @@
   "dependencies": {
     "cors": "^2.8.1",
     "express": "^4.14.1",
-    "firebase-admin": "^4.1.1",
+    "firebase-admin": "^4.1.2",
     "firebase-functions": "https://storage.googleapis.com/firebase-preview-drop/node/firebase-functions/firebase-functions-preview.latest.tar.gz"
   }
 }