✨ add backend that will serve API

Boy, was this a hassle. Writing the actual Express server was fine,
but getting it setup properly with `now` and adding Google's private key
as a secret variable took forever. THEN when that was solved I couldn't
for the life of me get the server deployed using `now` v2.

Ultimately ended up deciding to deploy the backend using v1 and will
have to read up on `now` lambdas and think about rewriting this as
serverless functions.

.gitignore

@@ -18,6 +18,9 @@ node_modules
 .env.test.local
 .env.production.local
 
+package-lock.json
+now-secrets.json
+
 npm-debug.log*
 yarn-debug.log*
 yarn-error.log*

server/.nowignore

@@ -0,0 +1,2 @@
+now-secrets.json
+now-secrets.json.example

server/api/index.js

@@ -0,0 +1,8 @@
+const { Router } = require('express')
+const router = Router()
+
+const riddles = require('./riddles')
+
+router.use('/riddles', riddles)
+
+module.exports = router

server/api/riddles.js

@@ -0,0 +1,64 @@
+const atob = require('atob');
+const admin = require('firebase-admin')
+const { Router } = require('express')
+const router = Router()
+
+const NODE_ENV = process.env.NODE_ENV || 'development'
+const PRIVATE_KEY = NODE_ENV === 'production'
+  ? atob(process.env.PRIVATE_KEY)
+  : process.env.PRIVATE_KEY
+
+admin.initializeApp({
+  credential: admin.credential.cert({
+    "type": process.env.TYPE,
+    "project_id": process.env.PROJECT_ID,
+    "private_key_id": process.env.PRIVATE_KEY_ID,
+    "private_key": PRIVATE_KEY,
+    "client_email": process.env.CLIENT_EMAIL,
+    "client_id": process.env.CLIENT_ID,
+    "auth_uri": process.env.AUTH_URI,
+    "token_uri": process.env.TOKEN_URI,
+    "auth_provider_x509_cert_url": process.env.AUTH_PROVIDER_X509_CERT_URL,
+    "client_x509_cert_url": process.env.CLIENT_X509_CERT_URL,
+  }),
+})
+const db = admin.firestore()
+const riddlesRef = db.collection('riddles')
+
+router.get('/', async (req, res) => {
+  try {
+    const riddlesSnapshot = await riddlesRef.get()
+    const riddles = []
+    riddlesSnapshot.forEach((doc) => {
+      const r = doc.data()
+      r['id'] = doc.id
+      riddles.push(r)
+    })
+    res.json(riddles)
+  } catch (e) {
+    res.status(400).json({
+      error: e.message
+    })
+  }
+})
+
+router.get('/:id', async (req, res) => {
+  try {
+    const id = req.params.id
+    const riddle = await riddlesRef.doc(id).get()
+
+    if (!riddle.exists) {
+      throw new Error(`No such document with 'id': ${id}`)
+    } else {
+      const r = riddle.data()
+      r['id'] = id
+      res.json(r)
+    }
+  } catch (e) {
+    res.status(400).json({
+      error: e.message
+    })
+  }
+})
+
+module.exports = router

server/app.js

@@ -0,0 +1,20 @@
+const express = require('express')
+const path = require('path')
+const cookieParser = require('cookie-parser')
+const cors = require('cors')
+const logger = require('morgan')
+
+require('now-env')
+
+const api = require('./api')
+const app = express()
+
+app.use(logger('dev'))
+app.use(express.json())
+app.use(express.urlencoded({ extended: false }))
+app.use(cookieParser())
+app.use(cors())
+
+app.use('/api/v1/', api)
+
+module.exports = app

server/bin/www

@@ -0,0 +1,90 @@
+#!/usr/bin/env node
+
+/**
+ * Module dependencies.
+ */
+
+var app = require('../app');
+var debug = require('debug')('server:server');
+var http = require('http');
+
+/**
+ * Get port from environment and store in Express.
+ */
+
+var port = normalizePort(process.env.PORT || '3000');
+app.set('port', port);
+
+/**
+ * Create HTTP server.
+ */
+
+var server = http.createServer(app);
+
+/**
+ * Listen on provided port, on all network interfaces.
+ */
+
+server.listen(port);
+server.on('error', onError);
+server.on('listening', onListening);
+
+/**
+ * Normalize a port into a number, string, or false.
+ */
+
+function normalizePort(val) {
+  var port = parseInt(val, 10);
+
+  if (isNaN(port)) {
+    // named pipe
+    return val;
+  }
+
+  if (port >= 0) {
+    // port number
+    return port;
+  }
+
+  return false;
+}
+
+/**
+ * Event listener for HTTP server "error" event.
+ */
+
+function onError(error) {
+  if (error.syscall !== 'listen') {
+    throw error;
+  }
+
+  var bind = typeof port === 'string'
+    ? 'Pipe ' + port
+    : 'Port ' + port;
+
+  // handle specific listen errors with friendly messages
+  switch (error.code) {
+    case 'EACCES':
+      console.error(bind + ' requires elevated privileges');
+      process.exit(1);
+      break;
+    case 'EADDRINUSE':
+      console.error(bind + ' is already in use');
+      process.exit(1);
+      break;
+    default:
+      throw error;
+  }
+}
+
+/**
+ * Event listener for HTTP server "listening" event.
+ */
+
+function onListening() {
+  var addr = server.address();
+  var bind = typeof addr === 'string'
+    ? 'pipe ' + addr
+    : 'port ' + addr.port;
+  debug('Listening on ' + bind);
+}

server/now-secrets.json.example

@@ -0,0 +1,12 @@
+{
+  "@type": "service_account",
+  "@project_id": "",
+  "@private_key_id": "",
+  "@private_key": "",
+  "@client_email": "",
+  "@client_id": "",
+  "@auth_uri": "",
+  "@token_uri": "",
+  "@auth_provider_x509_cert_url": "",
+  "@client_x509_cert_url": ""
+}

server/now.json

@@ -0,0 +1,18 @@
+{
+  "version": 1,
+  "name": "conundrum-api",
+  "public": false,
+  "env": {
+    "PORT": "3001",
+    "TYPE": "@type",
+    "PROJECT_ID": "@project_id",
+    "PRIVATE_KEY_ID": "@private_key_id",
+    "PRIVATE_KEY": "@private_key",
+    "CLIENT_EMAIL": "@client_email",
+    "CLIENT_ID": "@client_id",
+    "AUTH_URI": "@auth_uri",
+    "TOKEN_URI": "@token_uri",
+    "AUTH_PROVIDER_X509_CERT_URL": "@auth_provider_x509_cert_url",
+    "CLIENT_X509_CERT_URL": "@client_x509_cert_url"
+  }
+}

server/package.json

@@ -0,0 +1,23 @@
+{
+  "name": "conundrum-api",
+  "version": "1.0.0",
+  "private": true,
+  "scripts": {
+    "dev": "NODE_ENV=development nodemon -r now-env ./bin/www",
+    "start": "NODE_ENV=production node ./bin/www"
+  },
+  "dependencies": {
+    "atob": "^2.1.2",
+    "cookie-parser": "~1.4.3",
+    "cors": "^2.8.5",
+    "debug": "~2.6.9",
+    "dotenv": "^6.2.0",
+    "express": "~4.16.0",
+    "firebase-admin": "^6.3.0",
+    "morgan": "~1.9.0"
+  },
+  "devDependencies": {
+    "nodemon": "^1.18.7",
+    "now-env": "^3.1.0"
+  }
+}