Django Site Alias

A Django App to add support for domain aliases to entries in Django's Site framework.

The Problem

For example, your platform might create the FQDN for your customer like this:

customer.myplatform.com

They might want to use the domain name of:

customersite.com

The problem with Django's site framework is: 1 Domain = 1 Site ID

There are two ways to solve this. The first is to create an instance per customer that manually sets the SITE_ID. They then go to that instance running the app and it works. The downside is that you are provisioning a server per customer, which can get inefficient at scale.

What if you have multiple customers but waitn to maintain only one server?

The alternate to setting a SITE_ID explicitly is to use Django's middleware to figure out the site from the request. This is fine, if there is only one possible domain per customer.

Solution

To try to resolve this issue we created some lite 'wrapper' code around the Site framework to provide an alias lookup.

It's in a seperate model that you can let your customers update if you want (via a customer admin panel for example), letting them update as they want while keeping the Site model out of their hands.

Setup

To install run the following in a shell:

pip install django-site-alias

then add 'sitealias' to your django project's list of apps and run migrate to get the new model. Make sure to also include 'django.contrib.sites' since this is just a wraper around that code.

Builtin View Mixins

PassRequestToFormKwargsMixin - adds the current request to the form kwargs

SetSiteFromRequestFormValidMixin - sets the current site to the self.object.site with in the form_valid of any generic editing view

SiteQuerysetMixin: - Filters model by current site found in the request using get_queryset method

Built-in managers

from sitalias.models import RequestSiteManager

class Model(models.Model):
 #......
    objects = RequestSiteManager()

Will add the following chainable methods to the objects filter:

Model.objects.from_site(site)

or

Model.objects.from_request(request)

Included manager serves as a suggestion, feel free to build your own implementation.

Roadmap

• Middleware - sitealias.middleware.CurrentSite - mimics to django.contrib.sites.middleware.CurrentSite except that it adds current site to request object site via Sitealias model, before checking the Site table
• Shortcut - from sitealias.shortcuts import get_current_site - mimics django.contrib.sites.shortcuts.get_current_site but checks sitealias table before checking the Site model
• [] Callables for the ALLOWED_HOSTS setting (perhaps a subclass of the AllowedSites callable in django-allowedsites ?? )
  • [] CachedAllowedSitesAndAlias
  • [] AllowedSitesAndAliass ??

INSTALLED_APPS = [
    ...
    'django.contrib.sites',
    ...
    'sitealias',
    ...
]

Then in your Django settings, add the following to your middleware:

MIDDLEWARE = [
    ...
    'sitealias.middleware.CurrentSiteMiddleware',
    ...
]

This is meant to be a drop-in replacement for Django's 'django.contrib.sites.middleware.CurrentSiteMiddleware'. It will look for a site that matches an alias first, then fall back to Django's code.