Addons-frontend 🔥

Front-end infrastructure and code to complement mozilla/addons-server.

Security Bug Reports

This code and it’s associated production website are included in Mozilla’s web and services bug bounty program. If you find a security vulnerability, please submit it via the process outlined in the program and FAQ pages. Further technical details about this application are available from the Bug Bounty Onramp page.

Please submit all security-related bugs through Bugzilla using the web security bug form.

Never submit security-related bugs through a Github Issue or by email.

Requirements

• You need Node 6.x which is the current LTS (long term support) release.
• Install yarn to manage dependencies and run scripts.

The easiest way to manage multiple node versions in development is to use nvm.

Get started

• type yarn to install all dependencies
• type yarn dev:amo to start a dev server

Development commands

Here are some commands you can run:

Command	Description
yarn dev:amo	Start the dev server and proxy (amo)
yarn dev:amo:no-proxy	Start the dev server without proxy (amo)
yarn dev:disco	Start the dev server (discovery pane)
yarn flow:check	Check for Flow errors and exit
yarn flow:dev	Continuously check for Flow errors
yarn eslint	Lint the JS
yarn stylelint	Lint the SCSS
yarn lint	Run all the JS + SCSS linters
yarn version-check	Check you have the required dependencies
yarn test	Run all tests (Enters jest in --watch mode)
yarn test-coverage	Run all tests and generate code coverage report (Enters jest in --watch mode)
yarn test-coverage-once	Run all tests, generate code coverage report, then exit
yarn test-once	Run all tests with jest, then exit
yarn test-ci	Run all continuous integration checks. This is only meant to run on TravisCI.

Running tests

You can enter the interactive jest mode by typing yarn test. This is the easiest way to develop new features.

Here are a few tips:

• When you start yarn test, you can switch to your code editor and begin adding test files or changing existing code. As you save each file, jest will only run tests related to the code you change.
• If you had typed a when you first started then jest will continue to run the full suite even when you change specific files. Type o to switch back to the mode of only running tests related to the files you are changing.
• If you see something like Error watching file for changes: EMFILE on Mac OS then brew install watchman might fix it. See https://github.com/facebook/jest/issues/1767

Run a subset of the tests

By default, yarn test will only run a subset of tests that relate to the code you are working on.

To explicitly run a subset of tests, you can type t or p which are explained in the jest watch usage.

Alternatively, you can start the test runner with a specific file or regular expression, like:

yarn test tests/client/amo/components/TestAddonDetail.js

Run all tests

If you want to run all tests and exit, type:

yarn test-once

Flow

There is limited support for using Flow to check for problems in the source code.

To check for Flow issues during development while you edit files, run:

yarn flow:dev

If you are new to working with Flow, here are some tips:

• Check out the getting started guide.
• Read through the web-ext guide for hints on how to solve common Flow errors.

To add flow coverage to a source file, put a /* @flow */ comment at the top. The more source files you can opt into Flow, the better.

Here is our Flow manifesto:

• We use Flow to declare the intention of our code and help others refactor it with confidence. Flow also makes it easier to catch mistakes before spending hours in a debugger trying to find out what happened.
• Avoid magic Flow declarations for any internal code. Just declare a type alias next to the code where it's used and export/import it like any other object.
• Never import a real JS object just to reference its type. Make a type alias and import that instead.
• Never add more type annotations than you need. Flow is really good at inferring types from standard JS code; it will tell you when you need to add explicit annotations.
• When a function like getAllAddons takes object arguments, call its type object GetAllAddonsParams. Example:

type GetAllAddonsParams = {|
  categoryId: number,
|};

function getAllAddons({ categoryId }: GetAllAddonsParams = {}) {
  ...
}

• Use Exact object types via the pipe syntax ({| key: ... |}) when possible. Sometimes the spread operator triggers an error like 'Inexact type is incompatible with exact type' but that's a bug. You can use the Exact<T> workaround from src/core/types/util if you have to. This is meant as a working replacement for $Exact.
• Try to avoid loose types like Object or any but feel free to use them if you are spending too much time declaring types that depend on other types that depend on other types, and so on.
• You can add a $FLOW_FIXME comment to skip a Flow check if you run into a bug or if you hit something that's making you bang your head on the keyboard. If it's something you think is unfixable then use $FLOW_IGNORE instead. Please explain your rationale in the comment and link to a GitHub issue if possible.

Code coverage

To see a report of code coverage, type:

yarn test-coverage-once

This will print a table of files showing the percentage of code coverage. The uncovered lines will be shown in the right column but you can open the full report in a browser:

open coverage/lcov-report/index.html

Running AMO for local development

A proxy server is provided for running the AMO app with the API on the same host as the frontend. This provides a setup that is closer to production than running the frontend on its own. The default configuration for this is to use a local addons-server for the API which can be setup according to the addons-server docs. Docker is the preferred method of running addons-server.

Authentication will work when initiated from addons-frontend and will persist to addons-server but it will not work when logging in from an addons-server page. See mozilla/addons-server#4684 for more information on fixing this.

If you would like to use https://addons-dev.allizom.org for the API you should use the yarn dev:amo:no-proxy command with an API_HOST to start the server without the proxy. For example: API_HOST=https://addons-dev.allizom.org yarn dev:amo:no-proxy.

Configuring for local development

The dev scripts above will connect to a hosted development API by default. If you want to run your own addons-server API or make any other local changes, just add a local configuration file for each app. For example, to run your own discovery pane API, first create a local config file:

touch config/local-development-disco.js

Be sure to prefix the file with local-development- so that it doesn't pollute the test suite. Here's what local-development-disco.js would look like when overriding the apiHost parameter so that it points to your docker container:

module.exports = {
  apiHost: 'http://olympia.dev',
};

When you start up your front-end Discovery Pane server, it will now apply overrides from your local configuration file:

yarn dev:disco

Consult the config file loading order docs to learn more about how configuration is applied.

Disabling CSP for local development

When developing locally with a webpack server, the randomly generated asset URL will fail our Content Security Policy (CSP) and clutter your console with errors. You can turn off all CSP errors by settings CSP to false in any local config file, such as local-development-amo.js. Example:

module.exports = {
  CSP: false,
};

Building and running services

The following are scripts that are used in deployment - you generally won't need unless you're testing something related to deployment or builds.

The env vars are:

NODE_APP_INSTANCE this is the name of the app e.g. 'disco' NODE_ENV this is the node environment. e.g. production, dev, stage, development.

Script	Description
yarn start	Starts the express server (requires env vars)
yarn build	Builds the libs (all apps) (requires env vars)

Example: Building and running a production instance of the AMO app:

NODE_APP_INSTANCE=amo NODE_ENV=production yarn build
NODE_APP_INSTANCE=amo NODE_ENV=production yarn start

Note: To run the app locally in production mode you'll need to create a config file for local production builds. It must be saved as config/local-production-amo.js and should look like:

import { apiStageHost, amoStageCDN } from './lib/shared';

module.exports = {
  // Statics will be served by node.
  staticHost: '',
  // FIXME: sign-in isn't working.
  // fxaConfig: 'local',

  // The node server host and port.
  serverHost: '127.0.0.1',
  serverPort: 3000,

  enableClientConsole: true,
  apiHost: apiStageHost,
  amoCDN: amoStageCDN,

  CSP: {
    directives: {
      connectSrc: [
        apiStageHost,
      ],
      scriptSrc: [
        "'self'",
        'https://www.google-analytics.com',
      ],
      styleSrc: ["'self'"],
      imgSrc: [
        "'self'",
        'data:',
        amoStageCDN,
        'https://www.google-analytics.com',
      ],
      mediaSrc: ["'self'"],
      fontSrc: [
        "'self'",
        'data:',
        amoStageCDN,
      ],
    },
  },

  // This is needed to serve assets locally.
  enableNodeStatics: true,
  trackingEnabled: false,
  // Do not send client side errors to Sentry.
  publicSentryDsn: null,
};

After this, re-build and restart using yarn build and yarn start as documented above. If you have used localhost before with a different configuration, be sure to clear your cookies.

NOTE: At this time, it's not possible to sign in using this approach.

What version is deployed?

You can check to see what commit of addons-frontend is deployed by making a request like this:

curl https://addons-dev.allizom.org/__frontend_version__
{
   "build" : "https://circleci.com/gh/mozilla/addons-server/6550",
   "commit" : "87f49a40ee7a5e87d9b9efde8e91b9019e8b13d1",
   "source" : "https://github.com/mozilla/addons-server",
   "version" : ""
}

This will return a 415 response if a version.json file doesn't exist in the root directory. This file is typically generated by the deploy process.

For consistency with monitoring scripts, the same data can be retrieved at this URL:

curl https://addons-dev.allizom.org/__version__

Overview and rationale

This project will hold distinct front-ends e.g:

• Discovery Pane
• AMO or addons.mozilla.org

We've made a conscious decision to avoid "premature modularization" and keep this all in one repository. This will help us build out the necessary tooling to support a universal front-end infrastructure without having to worry about cutting packages and bumping versions the entire time.

At a later date if we need to move things out into their own project we still can.

Core technologies

• Based on Redux + React
• Code written in ES2015+
• Universal rendering via node
• Unit tests with high coverage (aiming for 100%)