Issue mozilla#16 - Use API key to fetch sheet with release status

We have changed the Quantum spreadsheet to be public and we now only
need an API key to make it work.

README.md

@@ -5,6 +5,40 @@ For the frontend code visit the [Firefox health dashboard](https://github.com/mo
 
 [![Build Status](https://api.travis-ci.org/mozilla/firefox-health-backend.svg?branch=master)](https://travis-ci.org/mozilla/firefox-health-backend)
 
+## Requirements
+
+* Node
+* Yarn (recommended)
+
+## Setting project up
+
+In your console:
+```
+yarn // To get the dependencies installed
+yarn start // To start the server
+```
+
+### Providing a Google API key
+
+The [notes](http://localhost:3000/api/perf/notes) API requires a `GOOGLE_API_KEY`
+in order to access a Google Spreadsheet. In order for this API to work locally
+you need to create an API key for it.
+
+Follow these instructions
+
+* Visit [Google's cloud dashboard](https://console.cloud.google.com/apis/dashboard)
+* Create a new project
+* Select "Enable APIs and services" and enable "Google Sheets API"
+* Back on the dashboard, go to credentials and create credentials
+  * Do not use the wizard but select "API Key" from the drop down
+* Name it something recognizable like "fx health local server"
+* Start the backend like this:
+
+```
+GOOGLE_API_KEY=<created API key> yarn start
+```
+* Visit http://localhost:3000/api/perf/notes to verify it works
+
 ## Attributions
 
 - heartbeat icon by Creative Stall from the Noun Project

app.json

@@ -3,7 +3,7 @@
   "scripts": {
   },
   "env": {
-    "GAUTH_JSON": {
+    "GOOGLE_API_KEY": {
       "required": true
     },
     "NPM_CONFIG_PRODUCTION": {

src/perf.js

@@ -19,33 +19,11 @@ import getCalendar from './release/calendar';
 // Project Dawn
 // channels.splice(2, 1);
 
-let jwtClient = null;
+const authKey = process.env.GOOGLE_API_KEY;
+const sheetsAPI = 'https://sheets.googleapis.com/v4/spreadsheets';
 const getSpreadsheetValues = async ({ id, range }) => {
-  if (!process.env.GAUTH_JSON) {
-    console.log('You need to set GAUTH_JSON');
-  }
-  if (!jwtClient) {
-    const jwtKey = JSON.parse(process.env.GAUTH_JSON);
-    jwtClient = new google.auth.JWT(
-      jwtKey.client_email,
-      null,
-      jwtKey.private_key,
-      'https://spreadsheets.google.com/feeds',
-      null,
-    );
-    await new Promise(resolve => jwtClient.authorize(resolve));
-  }
-  const { values } = await new Promise((resolve) => {
-    const sheets = google.sheets('v4');
-    sheets.spreadsheets.values.get(
-      {
-        auth: jwtClient,
-        spreadsheetId: id,
-        range: range,
-      },
-      (err, response) => resolve(response),
-    );
-  });
+  const url = `${sheetsAPI}/${id}/values/${range}?key=${authKey}`;
+  const { values } = await fetchJson(url);
   const headers = values.splice(0, 1).pop();
   return values.reduce((criteria, entry) => {
     const obj = {};
@@ -124,8 +102,9 @@ let notesCache = null;
 
 router
   .get('/notes', async (ctx) => {
-    if (process.env.GAUTH_JSON) {
+    if (process.env.GOOGLE_API_KEY) {
       if (!notesCache) {
+        console.log('Fetching notes since it is not in the cache.');
         notesCache = (await getSpreadsheetValues({
           id: '1UMsy_sZkdgtElr2buwRtABuyA3GY6wNK_pfF01c890A',
           range: 'Status!A1:F30',
@@ -134,16 +113,17 @@ router
           return hash;
         }, {});
 
-        // const result = await gsjson({
-        //   spreadsheetId: '1UMsy_sZkdgtElr2buwRtABuyA3GY6wNK_pfF01c890A',
-        //   worksheet: ['Status'],
-        //   credentials: process.env.GAUTH_JSON,
-        // });
         setTimeout(() => {
           notesCache = null;
         }, process.env.NODE_ENV === 'production' ? 1000 * 60 * 5 : 1000 * 60);
       }
       ctx.body = notesCache;
+    } else {
+      ctx.throw(
+        400,
+        'You need to set the GOOGLE_API_KEY for this endpoint to work. More info in ' +
+        'https://github.com/mozilla/firefox-health-backend/blob/master/README.md',
+      );
     }
   })
   .get('/benchmark/startup', async (ctx) => {