drf-firebase3-auth 0.0.7

Custom Django Rest Framework authentication backend for parsing Firebase uid tokens and storing as local users.

DRF Firebase3 Auth

Requirements

• Python (tested with 2.7, 3.6)
• Django
• Django Rest Framework

Installation

$ pip install drf-firebase3-auth

Add the application to your project's INSTALLED_APPS in settings.py.

INSTALLED_APPS = [
    ...
    'drf_firebase3_auth',
]

In your project's settings.py, add this to the REST_FRAMEWORK configuration. Note that if you want to retain access to the browsable API for locally created users, then you will probably want to keep rest_framework.authentication.SessionAuthentication too.

REST_FRAMEWORK = {
  ...
  'DEFAULT_AUTHENTICATION_CLASSES': [
    ...
    'rest_framework.authentication.SessionAuthentication',
    'drf_firebase3_auth.authentication.FirebaseAuthentication',
  ]
}

The drf_firebase3_auth application comes with the following settings as default, which can be overridden in your project's settings.py file. Make sure to nest them within DRF_FIREBASE_AUTH as below:

DRF_FIREBASE_AUTH = {
    # path to JSON file with firebase secrets
    'FIREBASE_SERVICE_ACCOUNT_KEY': '',
    # allow creation of new local user in db
    'FIREBASE_CREATE_LOCAL_USER': True,
    # attempt to split firebase user.display_name and set local user
    # first_name and last_name
    'FIREBASE_ATTEMPT_CREATE_WITH_DISPLAY_NAME': True,
    # commonly JWT or Bearer (e.g. JWT <token>)
    'FIREBASE_AUTH_HEADER_PREFIX': 'JWT',
    # verify that JWT has not been revoked
    'FIREBASE_CHECK_JWT_REVOKED': True,
    # require that firebase user.email_verified is True
    'FIREBASE_AUTH_EMAIL_VERIFICATION': False
}

You can get away with leaving all the settings as default except for FIREBASE_SERVICE_ACCOUNT_KEY, which is obviously required. As a minimum, you will need to set this in your project's settings.py. This must be the JSON service account key that you receive from the Firebase console for your application.

...
DRF_FIREBASE_AUTH = {
    'FIREBASE_SERVICE_ACCOUNT_KEY': 'project/config/firebase.json'
}

Now that you have configured the application, run the migrations so that the Firebase data can be stored.

$ ./manage.py migrate drf_firebase3_auth

All you need to do now is have your client code handle the Firebase popup/redirect authentication flow, retrieve the idToken from the currentUser (Firebase explains this flow well in their docs: https://firebase.google.com/docs/auth/admin/verify-id-tokens), and then use the idToken for the user in an Authorization header in requests to your API.

JWT <token>

Voila!

Contributing

• If you test this code with a Python version not listed above and all is well, please fork and update the README to include the Python version you used :)
• I almost always setup Django with a custom user class inheriting from AbstractUser, where I switch the USERNAME_FIELD to be 'email'. This backend is setup to assign a username still anyway, but if there are any issues, please raise them and/or make a pull request to help the community!