Liberapay is a recurrent donations platform.

It's a fork of Gittip/Gratipay, see this post for the differences between the two.

You have a question? Come ask us in the salon or in the IRC channel #liberapay on Freenode.

If you have questions about translating Liberapay, you can ask them in the translation thread of the salon.

Liberapay is a fork of Gratipay, so it uses the web micro-framework Aspen, which is based on filesystem routing and simplates. Don't worry, it's quite simple. For example to make Liberapay return a Hello $user, your id is $userid message for requests to the URL /$user/hello, you only need to create the file www/%username/hello.spt with this inside:

from liberapay.utils import get_participant
[---]
participant = get_participant(state)
[---] text/html
{{ _("Hello {0}, your id is {1}", request.path['username'], participant.id) }}

As illustrated by the last line our default template engine is Jinja.

The _ function attempts to translate the message into the user's language and escapes the variables properly (it knows that it's generating a message for an HTML page).

The python code inside simplates is only for request-specific logic, common backend code is in the liberapay/ directory.

Firstly, make sure you have the following dependencies installed:

• python ≥ 2.7.8 (the code is compatible with python 3, but production still runs on python 2 for now)
• postgresql 9.4.5 (see the official download & install docs
• make

Then run:

make env

Now you need to give yourself superuser postgres powers (if it hasn't been done already), and create two databases:

su postgres -c "createuser --superuser $(whoami)"

createdb liberapay
createdb liberapay_tests

If you need a deeper understanding take a look at the Database Roles and Managing Databases sections of PostgreSQL's documentation.

Then you can set up the DB:

make schema

Environment variables are used for configuration, the default values are in defaults.env and tests/test.env. You can override them in local.env and tests/local.env respectively.

Once you've installed everything and set up the database, you can run the app:

make run

It should now be accessible at http://localhost:8339/.

You can create some fake users to make it look more like the real site:

make data

The python code interacts with the database by sending raw SQL queries through the postgres.py library.

The official PostgreSQL documentation is your friend when dealing with SQL, especially the sections "[The SQL Language] (https://www.postgresql.org/docs/9.4/static/sql.html)" and "[SQL Commands] (https://www.postgresql.org/docs/9.4/static/sql-commands.html)".

The DB schema is in sql/schema.sql, but don't modify that file directly, instead put the changes in sql/branch.sql. During deployment that script will be run on the production DB and the changes will be merged into sql/schema.sql. That process is semi-automated by release.sh.

For our styles we use SASS and [Bootstrap 3] (https://getbootstrap.com/). Stylesheets are in the style/ directory and our JavaScript code is in js/. Our policy for both is to have as little as possible of them: the website should be almost entirely usable without JS, and our CSS should leverage Bootstrap as much as possible instead of containing lots of custom rules that would become a burden to maintain.

We compile Bootstrap ourselves from the SASS source in the style/bootstrap/ directory. We do that to be able to easily customize it by changing values in style/variables.scss. Modifying the files in style/bootstrap/ is probably not a good idea.

The easiest way to run the test suite is:

make test

That recreates the test DB's schema and runs all the tests. To speed things up you can also use the following commands:

• make pytest only runs the python tests without recreating the test DB
• make pytest-re does the same but only runs the tests that failed in the previous run

We depend on MangoPay for payments. If you want to modify that part of the code you'll need the MangoPay API documentation.

Liberapay is currently hosted on the legacy 2.x version of OpenShift Online (not the new v3 based on Docker). The user documentation is on developers.openshift.com. We need to migrate either to v3 or to something else soon (want to help? see #177).

To deploy the app simply run release.sh, it'll guide you through it. Of course you need to be given access first.

If you don't want to install directly dependencies on your machine, you can spin up a development environment easily, assuming you have Docker and docker-compose installed:

# build the local container
docker-compose build

# initialize the database
docker-compose run web bash recreate-schema.sh

# populate the database with fake data
docker-compose run web python -m liberapay.utils.fake_data

# launch the database and the web server
# the application should be available on http://localhost:8339
docker-compose up

You can also run tests in the DOcker environment:

docker-compose -f docker/tests.yml run tests

All arguments are passed to the underlying py.test command, so you can use -x for failing fast or --ff to retry failed tests first:

docker-compose -f docker/tests.yml run tests -x --ff

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