[Firebase Hosting,Functions] basic認証付きでサイトを公開する

firebase.json

{
  "hosting": {
    "public": "public",
    "rewrites": [
      {
        "source": "**",
        "function": "app"
      }
    ],
    "redirects": [{
      "source": "/",
      "destination": "/auth"
    }],
    "ignore": [
      "firebase.json",
      "**/.*",
      "**/node_modules/**"
    ]
  }
}

functions_index.js

# functions/index.js

const functions = require('firebase-functions')
const express = require('express')
const basicAuth = require('basic-auth-connect')

const app = express()

app.use(basicAuth('username', 'password'))

app.get('/auth', (req, res) => {
  res.redirect('/index.html')
})

exports.app = functions.https.onRequest(app)

index.html

filepath: public/index.html
Hello Firebase!