Cloud functions examples for Tatsuya

index.js

const functions = require('firebase-functions');
const admin = require('firebase-admin');
const Mercury = require('@postlight/mercury-parser');
const { countArticleWords } = require( './lib/articles' );

admin.initializeApp(functions.config().firebase);

/*
	Create some profile information in the users collection,
	including an array in which to store the user's article
	IDs and any other profile information

	Todo: delete this information on user account removal
*/
exports.createProfile = functions.auth.user()
	.onCreate(user => (
		// Include the Welcome message in the user's article list
		admin.database().ref(`users/${user.uid}`).set({
			articles: [
				{
					articleId: 'welcome',
					read: false,
					deleted: false,
					scrollDepth: 0,
					dateAdded: Date.now(),
				},
			],
		})
	));

exports.fetchArticleData = functions.database.ref('/articles/{articleId}')
	.onCreate(snapshot => {
		const article = snapshot.val();
		const { url } = article;

		console.log('New URL added. Fetching data for', url);

		return Mercury.parse(url)
			.then(data => {
				console.log('Received data', data);
				let { word_count } = data;
				const { content } = data;

				/*
					If word_count is too low, Mercury probably failed to return
					a usable value. Attempt our own rudimentary word count by
					stripping the HTML tags and counting the spaces.
				*/
				if ( word_count < 10 && content.length ) {
					word_count = countArticleWords( content );
				}

				snapshot.ref.update( {
					...data,
					word_count,
				} );
			})
			.catch(err => {
				console.error('Could not fetch data for', url, err);
				snapshot.ref.update({
					error: true,
				});
			});
		});

package.json

{
	"name": "functions",
	"description": "Cloud Functions for Firebase",
	"engines": {
		"node": "8"
	},
	"scripts": {
		"serve": "firebase serve --only functions",
		"shell": "firebase functions:shell",
		"start": "npm run shell",
		"deploy": "firebase deploy --only functions",
		"logs": "firebase functions:log"
	},
	"dependencies": {
		"@postlight/mercury-parser": "^2.0.0",
		"firebase-admin": "~7.0.0",
		"firebase-functions": "^2.2.0"
	},
	"private": true
}