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Providers for django-allauth allowing using the ENS' auth-systems.

Project description

This package is meant to ease the management of authentication of django-apps at the ENS.

On top of django-allauth, which provides easy ways to configure the authentication of django-apps, this package provides:

  • social authentication using Clipper (cas.eleves);
  • ready-to-use templates in replacement of allauth’ ones;
  • helpers to use allauth’s login and logout views instead of those provided by third-parties (Django admin, wagtail, etc).

Contents

Installation

First, install django-allauth.

Then, install django-allauth-ens:

$ pip install django-allauth-ens

And edit your settings file:

INSTALLED_APPS = [
    # …

    # Above allauth to replace its templates.
    'allauth_ens',

    # Added when you installed allauth.
    'allauth',
    'allauth.account',
    'allauth.socialaccount',

    # Required to use CAS-based providers (e.g. Clipper).
    'allauth_cas',

    # …
]

Configuration

See also the allauth configuration and advanced usage docs pages.

ACCOUNT_HOME_URL

Optional — A view name or an url path.

Used as a link from the templates of allauth_ens to return to your application.

Examples: 'home', '/home/'

ACCOUNT_DETAILS_URL

Optional — A view name or an url path.

Used as a link from the templates of allauth_ens for a logged in user to access their profile in your app.

Examples: 'my-account', '/my-account/'

ALLAUTH_ENS_HIGHLIGHT_CLIPPER

Optional — Boolean (default: True).

When set to True, displays prominently the Clipper option in the login view (if you use the allauth_ens templates).

Views

Capture other login and logout views

You can use the capture_login and capture_logout views to replace the login and logout views of other applications. They redirect to their similar allauth’s view and forward the query string, so that if a GET parameter next is given along the initial request, user is redirected to this url on successful login and logout.

This requires to add urls before the include of the app’ urls.

For example, to replace the Django admin login and logout views with allauth’s ones:

from allauth_ens.views import capture_login, capture_logout

urlpatterns = [
    # …

    # Add it before include of admin urls.
    url(r'^admin/login/$', capture_login),
    url(r'^admin/logout/$', capture_logout),

    url(r'^admin/$', include(admin.site.urls)),

    # …
]

Templates

The templates provided by allauth only contains the bare minimum. Hopefully, this package includes ready-to-use templates. They are automatically used if you put 'allauth_ens' before 'allauth' in your INSTALLED_APPS,

Providers

Google, Facebook¸ but also Clipper…

To interact with an external authentication service, you must add the corresponding provider application to your INSTALLED_APPS.

allauth already includes several providers (see also their python path). In addition to that, this package adds the following providers:

Clipper

It uses the CAS server https://cas.eleves.ens.fr/.

Installation
Add 'allauth_ens.providers.clipper' to the INSTALLED_APPS.
Configuration

Available settings and their default value:

SOCIALACCOUNT_PROVIDERS = {
    # …
    'clipper': {
        # These settings control whether a message containing a link to
        # disconnect from the CAS server is added when users log out.
        'MESSAGE_SUGGEST_LOGOUT_ON_LOGOUT': True,
        'MESSAGE_SUGGEST_LOGOUT_ON_LOGOUT_LEVEL': messages.INFO,
    },
}
Auto-signup
Populated data
  • username: <clipper>
  • email (primary and verified): <clipper>@clipper.ens.fr

Adapters

Long Term Clipper Adapter

We provide an easy-to-use SocialAccountAdapter to handle the fact that Clipper accounts are not eternal, and that there is no guarantee that the clipper usernames won’t be reused later.

This adapter also handles getting basic information about the user from SPI’s LDAP.

Important: If you are building on top of allauth, take care to preserve the extra_data['ldap'] of SocialAccount instances related to Clipper (where provider_id is clipper or clipper_inactive).

Configuration
Set SOCIALACCOUNT_ADAPTER='allauth_ens.adapter.LongTermClipperAccountAdapter' in settings.py
Auto-signup
Populated data
  • username: <clipper>@<entrance year>
  • email: from LDAP’s mailRoutingAddress field, or <clipper>@clipper.ens.fr
  • first_name, last_name from LDAP’s cn field
  • entrance_year (as 2-digit string), department_code, department and promotion (department+year) parsed from LDAP’s homeDirectory field
  • extra_data in SocialAccount instance, containing all these field except promotion (and available only on first connection)
Account deprecation
At the beginning of each year (i.e. early November), to prevent clipper username conflicts, you should run $ python manage.py deprecate_clippers. Every association clipper username <-> user will then be put on hold, and at the first subsequent connection, a verification of the account will be made (using LDAP), so that a known user keeps his account, but a newcomer won’t inherit an archicube’s.
Customize
You can customize the SocialAccountAdapter by inheriting allauth_ens.adapter.LongTermClipperAccountAdapter. You might want to modify get_username(clipper, data) to change the default username format. By default, get_username raises a ValueError when the connexion to the LDAP failed or did not allow to retrieve the user’s entrance year. Overriding get_username (as done in the example website) allows to get rid of that behaviour, and for instance attribute a default entrance year.
Initial migration
Description
If you used allauth without LongTermClipperAccountAdapter, or another CAS interface to log in, you need to update the Users to the new username policy, and (in the second case) to create the SocialAccount instances to link CAS and Users. This can be done easily with $ python manage.py install_longterm.
Install_longterm options
  • --use-socialaccounts: Use the existing SocialAccounts rather than all the Users. Useful if you are already using Allauth and don’t want install_longterm to mess with the non-clipper authentications.
  • --keep-usernames: Do not apply the username template (e.g. clipper@promo) to the existing accounts, only populate the SocialAccounts with LDAP informations. Useful if you don’t want to change the usernames of previous users, but do want such a template for future accounts.
  • --clipper-field <field_name>: Use a special field rather than the username to get the clipper username (for LDAP lookup and SocialAccount creation/update). This parameter is compatible with ForeignKeys (e.g. profile.clipper). Note: --use-socialaccounts will ignore the --clipper-field parameter.
  • --fake: Do not modify the database. Use it to test there is no conflict, and be sure the changes are the ones expected. This command does not check for uniqueness errors, so there it may succeed and the actual command fail eventually.
Typical use cases
  • Django-cas-ng -> Longterm: Use install_longterm without parameters, or maybe --keep-usernames. If you had a custom username handling, --clipper_field may be useful.
  • Allauth -> Longterm: Use install_longterm with --use-socialaccounts, and maybe --keep-usernames.

Demo Site

See example/README.

Development

First, you need to clone the repository.

Stylesheets

This project uses compass to compile SCSS files to CSS.

Using bundler

Requirements
  • Ensure Ruby is installed ($ ruby -v) or install Ruby
  • Ensure bundler is installed ($ bundle -v) or install bundler ($ gem install bundler)
  • Install dependencies: $ bundle install
Compile
  • Watch changes and recompile: $ bundle exec compass watch

Tests

Local environment

Requirements
  • fakeldap and mock, install with $ pip install mock fakeldap
Run
  • $ ./runtests.py

All

Requirements
  • tox, install with $ pip install tox
  • python{2.7,3.4,3.5,3.6} must be available on your system path
Run
  • all (django/python with combined coverage + flake8 + isort): $ tox

Howtos

Assuming you use the following settings (when needed):

ACCOUNT_ADAPTER = 'shared.allauth_adapter.AccountAdapter'
SOCIALACCOUNT_ADAPTER = 'shared.allauth_adapter.SocialAccountAdapter'

Signup disabled, except for clipper provider (auto-signup)

In shared/allauth_adapter.py:

class AccountAdapter(DefaultAccountAdapter):
    def is_open_for_signup(self, request):
        return False

class SocialAccountAdapter(DefaultSocialAccountAdapter):
    def is_open_for_signup(self, request, sociallogin):
        # sociallogin.account is a SocialAccount instance.
        # See https://github.com/pennersr/django-allauth/blob/master/allauth/socialaccount/models.py

        if sociallogin.account.provider == 'clipper':
            return True

        # It returns AccountAdapter.is_open_for_signup().
        # See https://github.com/pennersr/django-allauth/blob/master/allauth/socialaccount/adapter.py
        return super().is_open_for_signup(request, sociallogin)

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