addDnsAndStorage.js

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const {credentials} = functions.config().auth;
credentials.private_key = credentials.private_key.replace(/\\n/g, '\n');
const config = Object.assign({}, functions.config().firebase, {credentials});
admin.initializeApp(config);
const gcs = require('@google-cloud/storage')({credentials});
const dns = require('@google-cloud/dns')({credentials});
const zoneName = 'applambda';
const zone = dns.zone(zoneName);

exports.createDeleteDNSAndStorage = functions.database.ref('/apps/{uid}/{appid}/name')
.onWrite(event => {
	// Only edit data when it is first created.
	const {uid, appid} = event.params;
	const name = event.data.val();
	const dbRef = admin.database().ref(`/apps/${uid}/${appid}`);

	if (event.data.previous.exists()) {
		console.log(`already exists ${uid}/${appid}`);
		return;
	}
	// Exit when the data is deleted.
	if (!event.data.exists()) {
		console.log(`data is being deleted ${uid}/${appid}`);
		return;
	}

	const url = `${name}.${zoneName}.com`;
	console.log(`data: ${uid}/${appid}/${name}\nsetting up: ${url}`);

	setupDNS({url, dbRef});
	setupStorage({url, dbRef});
	return;
});

function setupDNS({url, dbRef}) {

	// Create an NS record.
	let cnameRecord = zone.record('cname', {
		name: `${url}.`,
		data: 'c.storage.googleapis.com.',
		ttl: 3000
	});

	zone.addRecords(cnameRecord).then(function() {
		console.log(`done setting up zonerecord for ${url}`);
		dbRef.update({dns: url}).then(res => console.log(res)).catch(err => console.log(err));
	}).catch(function(err) {
		console.error(`error setting up zonerecord for ${url}`);
		console.error(err);
	});
}

function setupStorage({url, dbRef}) {
	console.log(`setting up storage bucket for ${url}`);

	gcs.createBucket(url, {
		website: {
			mainPageSuffix: `https://${url}`,
			notFoundPage: `https://${url}/404.html`
		}
	}).then(function(res) {
		let bucket = res[0];
		console.log(`created bucket ${url}, setting it as public`);
		dbRef.update({storage: url}).then(function() {
			console.log(`done setting up bucket for ${url}`);
		}).catch(function(err) {
			console.error(`db update for storage failed ${url}`);
			console.error(err);
		});
		bucket.makePublic().then(function() {
			console.log(`bucket set as public for ${url}`);
		}).catch(function(err) {
			console.error(`setting public for storage failed ${url}`);
			console.error(err);
		});
	}).catch(function(err) {
		console.error(`creating bucket failed ${url}`);
		console.error(err);
	});
}