Library on Heroku

by nytimes

GitHub Readme.md

Library Build Status

A collaborative newsroom documentation site, powered by Google Docs.

Table of Contents

Demo Site & User Guide

Documentation about how to get started with Library is hosted as a working (read only) demo on Heroku. Consult the site for more detailed instructions than this readme about how to get the most out of Library: https://nyt-library-demo.herokuapp.com.

Contacting us

Love Library? Let us know by joining our Google Group and dropping us a line. You'll also stay up to date with the latest Library features via our release notes, which get sent to this list.

Questions

If you have questions about how to get your copy of Library up and running, join our Google Group) and let us know what you're running into. We also keep an eye on the #proj-library channel in the News Nerdery Slack. We'll do our best to answer your questions.

Development Workflow

  1. Clone and cd into the repo:

    git clone git@github.com:nytimes/library.git && cd library

  2. From the Google API console, create or select a project, then create a service account with the Cloud Datastore User role. It should have API access to Drive and Cloud Datastore. Store these credentials in server/.auth.json.

    • To use oAuth, you will also need to create oAuth credentials.
    • To use the Cloud Datastore API for reading history, you will need to add in your GCP_PROJECT_ID.
  3. Install dependencies:

    npm install --no-optional

  4. Create a .env file at the project root. An example .env might look like

NODE_ENV=development # node environment
# Google oAuth credentials
GOOGLE_CLIENT_ID=123456-abcdefg.apps.googleusercontent.com
GOOGLE_CLIENT_SECRET=abcxyz12345
GCP_PROJECT_ID=library-demo-1234
APPROVED_DOMAINS="nytimes.com,dailypennsylvanian.com" # comma separated list of approved access domains.
SESSION_SECRET=supersecretvalue

# Google drive Configuration
DRIVE_TYPE=team # or folder, if using a folder instead of a team drive
DRIVE_ID=0123456ABCDEF # the ID of your team's drive or shared folder. The string of random numbers and letters at the end of your team drive or folder url.

Make sure to remove all comments after the DRIVE_TYPE and DRIVE_ID vars.

Be careful! Setting NODE_ENV to development changes the built in behaviors for site authentication to allow accounts other than those in the APPROVED_DOMAINS list. Never use NODE_ENV=development for your deployed site, only locally.

  1. Start the app:

    npm run watch

The app should now be running at localhost:3000. Note that Library requires Node v8 or higher.

Tests

You can run functional and unit tests, which test HTML parsing and routing logic, with npm test. A coverage report can be generated by running npm run test:cover.

The HTML parsing tests are based on the Supported Formats doc. To download a fresh copy of the HTML after making edits, run node test/utils/updateSupportedFormats.js.

Customization

Styles, text, caching logic, and middleware can be customized to match the branding of your organization. This is covered in the customization readme.

A sample customization repo is provided at nytimes/library-customization-example.

Deploying the app

Wherever you deploy Library, you'll likely want to set up a Google service account and OAuth 2.0 client Set up your service account with API access to Drive and Cloud Datastore.

If you wish to deploy Library with customizations, create a git repo with the files you would like to include. Set the CUSTOMIZATION_GIT_REPO environment variable to the cloning URL. Files in the repo and packages specified in the package.json will be included in your library installation.

For more detailed instructions, consult the Getting Started section of the demo site: https://nyt-library-demo.herokuapp.com/get-started

Using Heroku

This button can quickly deploy to Heroku: Deploy

Set your app's GOOGLE_APPLICATION_JSON, GOOGLE_CLIENT_ID, and GOOGLE_CLIENT_SECRET with values from the service account and Oauth client. Add <your-heroku-app-url>.com as an authorized domain in the general OAuth consent screen setup and then add http://<your-heroku-app-url>.com/auth/redirect as the callback url in the OAuth credential setup itself.

Using Google App Engine

You can also deploy Library to GAE, using the included app.yaml. Note that you will need to enable billing on your GCP project in order to use Google App Engine. More detailed instructions are provided on the demo site.

Using Docker

Library can be used as a base image for deployment using Docker. This allows you to automate building and deploying a custom version of Library during Docker's build phase. If you create a repo with the contents of your custom folder, you could deploy library from that repo with a Dockerfile like the following:

FROM nytimes/library

# copy custom files to library's custom repo
COPY . ./custom/

# move to a temporary folder install custom npm packages
WORKDIR /usr/src/tmp
COPY package*.json .npmrc ./
RUN npm i
# copy node modules required by custom node modules
RUN yes | cp -rf ./node_modules/* /usr/src/app/node_modules

# return to app directory and build
WORKDIR /usr/src/app
RUN npm run build

# start app
CMD [ "npm", "start" ]

Standard Deployment

Library is a standard node app, so it can be deployed just about anywhere. If you are looking to deploy to a standard VPS, Digital Ocean's tutorials are a great resource.

App structure

Server

The main entry point to the app is index.js.

This file contains the express server which will respond to requests for docs in the configured team drive or shared folder. Additionally, it contains logic about issuing 404s and selecting the template to use based on the path.

Views

Views (layouts) are located in the layouts folder. They use the .ejs extension, which uses a syntax similar to underscore templates.

Base styles for the views are in the styles directory containing Sass files. These files are compiled to CSS and placed in public/css.

Doc parsing

Doc HTML fetch and parsing is handled by docs.js. fetchDoc takes the ID of a Google doc and a callback, then passes the HTML of the document into the callback once it has been downloaded and processed.

Listing the drive

Traversing the contents of the NYT Docs folder is handled by list.js. There are two exported functions:

  • getTree is an async call that returns a nested hash (tree) of Google Drive Folder IDs mapped to their children. It is used by the server to determine whether a route is valid or not.

  • getMeta synchronously returns a hash of Google Doc IDs to metadata objects that were saved in the course of populating the tree. This metadata includes edit history, document authors, and parent folders.

The tree and file metadata are repopulated into memory on an interval (currently 60s). Calling getTree multiple times will not return fresher data.

Auth

Authentication with the Google Drive v3 api is handled by the auth.js file, which exposes a single method getAuth. getAuth will either return an already instantiated authentication client or produce a fresh one. Calling getAuth multiple times will not produce a new authentication client if the credentials have expired; we should build this into the auth.js file later to automatically refresh the credentials on some sort of interval to prevent them from expiring.