Polaris Documentation

What is Polaris?

Polaris is an implementation of SEP-24 maintained by the Stellar Development Foundation (SDF). SEP-24 is a standard defined to make wallets and anchors interoperable, meaning any wallet can communicate with any anchor for the purpose of withdrawing or depositing assets into the stellar network.

Polaris is not a library or a framework; its an extendable django app. Like many django apps, it comes with fully-implemented endpoints, templates, and database models. As a developer using Polaris, you don't need to know everything about how Polaris is implemented, even though the project is completely open source and available at the SDF's github.

Polaris does not aim to give you full control of the SEP-24 implementation. Instead, Polaris provides several base classes for integrating with its already-implemented functionality, similar to a framework. This documentation focuses on the parts of Polaris you will need to use in order to fully implement the SEP-24 protocol.

Documentation for these base classes can be found in the :doc:`Integrations </integrations/index>` section.

For an example on how to use Polaris, see the SDF's stellar-anchor-server.

Installation

First make sure you have cd'ed into your django project's main directory and then run

pip install django-polaris

Add it to INSTALLED_APPS in settings.py

INSTALLED_APPS = [
    ...,
    "polaris",
]

Add Polaris' :doc:`PolarisSameSiteMiddleware </middleware/index>` to your settings.MIDDLEWARE. Make sure its listed above SessionMiddleware.

MIDDLEWARE = [
    'django.middleware.security.SecurityMiddleware',
    'polaris.middleware.PolarisSameSiteMiddleware',
    'django.contrib.sessions.middleware.SessionMiddleware',
    'django.middleware.common.CommonMiddleware',
    'django.middleware.csrf.CsrfViewMiddleware',
    'django.contrib.auth.middleware.AuthenticationMiddleware',
    'django.contrib.messages.middleware.MessageMiddleware',
    'django.middleware.clickjacking.XFrameOptionsMiddleware',
]

Define PROJECT_ROOT in your project's settings.py. Polaris uses this to find your .env file.

PROJECT_ROOT = os.path.dirname(os.path.dirname(os.path.abspath(__file__)))

Paste the text below into PROJECT_ROOT/.env. The stellar-anchor-server repository contains instructions for modifying this file to fit your use case.

DJANGO_SECRET_KEY="secretkeykeysecret"
DJANGO_DEBUG=True
STELLAR_DISTRIBUTION_ACCOUNT_SEED="SCHTHF3N4SHEQM25M43FJ43UTCZP6OO3JKYVJCJBZ4YW6KVVAGC2OUCT"
STELLAR_ISSUER_ACCOUNT_ADDRESS="GCTVATNFP4FYKZ7BXZ3EOPVKEL2DGDCB2AVBDUNLW7NYR7REF5PMKY4V"

# STELLAR_NETWORK_PASSPHRASE can either be "Test SDF Network ; September 2015" or
# "Public Global Stellar Network ; September 2015" or a custom passphrase
# if you're using a private network.
STELLAR_NETWORK_PASSPHRASE="Test SDF Network ; September 2015"
# HORIZON_URI can point to a custom Horizon URI. It currently points
# to the testnet URL.
HORIZON_URI="https://horizon-testnet.stellar.org/"
SERVER_JWT_KEY="secret"

Add the Polaris endpoints in urls.py

import polaris.urls
from django.urls import path, include

urlpatterns = [
    ...,
    path("", include(polaris.urls)),
]

Run migrations: python manage.py migrate

You now have Polaris completely integrated into your Django project!

Contributing

To set up the development environment, fork the repository, then:

cd django-polaris
docker-compose build
docker-compose up

You should now have a minimal anchor server running on port 8000. When you make changes locally, the docker containers will restart with the updated code. Your browser may complain about the service using a self-signed certificate for HTTPS. You can resolve this by marking the certificate used by the service as trusted.

Testing

You can install the dependencies locally in a virtual environment:

pip install pipenv
cd django-polaris
pipenv install --dev
pipenv run pytest -c polaris/pytest.ini

Or, you can simply run the tests from inside the docker container. However, this may be slower.

docker exec -it <image ID> pipenv run pytest

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