app-MAIL-temp/CONTRIBUTING.md

Thanks for taking the time to contribute! 🎉👍

The project uses Flask, Python3.7+ and requires Postgres 12+ as dependency.

General Architecture

SimpleLogin backend consists of 2 main components:

• the webapp used by several clients: the web app, the browser extensions (Chrome & Firefox for now), OAuth clients (apps that integrate "Sign in with SimpleLogin" button) and mobile apps.

• the email handler: implements the email forwarding (i.e. alias receiving email) and email sending (i.e. alias sending email).

Install dependencies

The project requires:

• Python 3.7+ and poetry to manage dependencies
• Node v10 for front-end.
• Postgres 12+

First, install all dependencies by running the following command. Feel free to use virtualenv or similar tools to isolate development environment.

poetry install

On Mac, sometimes you might need to install some other packages via brew:

brew install pkg-config libffi openssl postgresql

You also need to install gpg tool, on Mac it can be done with:

brew install gnupg

Run tests

sh scripts/run-test.sh

Run the code locally

Install npm packages

cd static && npm install

To run the code locally, please create a local setting file based on example.env:

cp example.env .env

Run the postgres database:

docker run -e POSTGRES_PASSWORD=mypassword -e POSTGRES_USER=myuser -e POSTGRES_DB=simplelogin -p 35432:5432 postgres:13

To run the server:

flask db upgrade && flask dummy-data && python3 server.py

then open http://localhost:7777, you should be able to login with john@wick.com / password account.

You might need to change the .env file for developing certain features. This file is ignored by git.

Database migration

The database migration is handled by alembic

Whenever the model changes, a new migration has to be created.

If you have Docker installed, you can create the migration by the following script:

sh scripts/new-migration.sh

Make sure to review the migration script before committing it. Sometimes (very rarely though), the automatically generated script can be incorrect.

We cannot use the local database to generate migration script as the local database doesn't use migration. It is created via db.create_all() (cf fake_data() method). This is convenient for development and unit tests as we don't have to wait for the migration.

Code structure

The repo consists of the three following entry points:

• wsgi.py and server.py: the webapp.
• email_handler.py: the email handler.
• cron.py: the cronjob.

Here are the small sum-ups of the directory structures and their roles:

• app/: main Flask app. It is structured into different packages representing different features like oauth, api, dashboard, etc.
• local_data/: contains files to facilitate the local development. They are replaced during the deployment.
• migrations/: generated by flask-migrate. Edit these files will be only edited when you spot (very rare) errors on the database migration files.
• static/: files available at /static url.
• templates/: contains both html and email templates.
• tests/: tests. We don't really distinguish unit, functional or integration test. A test is simply here to make sure a feature works correctly.

Pull request

Please contact us if you want to work on a new feature.

The code is formatted using https://github.com/psf/black, to format the code, simply run

poetry run black .

The code is also checked with flake8, make sure to run flake8 before creating the pull request by

poetry run flake8

Test sending email

swaks is used for sending test emails to the email_handler.

mailcatcher or MailHog can be used as a MTA to receive emails.

Here's how set up the email handler:

1. run mailcatcher or MailHog

mailcatcher

2. Make sure to set the following variables in the .env file

# comment out this variable
# NOT_SEND_EMAIL=true

# So the emails will be sent to mailcatcher/MailHog
POSTFIX_SERVER=localhost
POSTFIX_PORT=1025

3. Run email_handler

python email_handler.py

4. Send a test email

swaks --to e1@sl.local --from hey@google.com --server 127.0.0.1:20381

Now open http://localhost:1080/ (or http://localhost:1080/ for MailHog), you should see the forwarded email.