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Django middleware to allow user configurable domain anchoring to admin configured urlconfs.

Project description

Django Anchored Domains
==========================

django-ikari is an application for anchoring configurable
urlconfs to user configurable subdomains or domains to use
in software-as-a-service projects.

Table of Contents
=================
1 Installation
2 Settings
3 Models
3.1 Permissions
4 Middleware
5 Views
6 URLs
7 Templates
8 License


1 Installation
~~~~~~~~~~~~~~
Copy or symlink `ikari/' subdirectory to Python path (`setup.py'
script for automated installation will be supplied later on). Module
contents are available in the `domains' module.

In order to use application, add `domains' to INSTALLED_APPS in
Django project `settings.py' file,
`domains.middleware.DomainsMiddleware' to MIDDLEWARE_CLASSES
after `AuthenticationMiddleware', and configure application settings
described in the next section.

2 Settings
~~~~~~~~~~
Following Django settings are read by the application:
- `DOMAINS_ACCOUNT_URLCONF' - if set, `request.urlconf' is set to
this value when Domain's domain is accessed. This breaks
django-debug-toolbar and misleads reverse URL resolver (main
urlconf is always used for reverse URL resolving).
- `DOMAINS_DEFAULT_DOMAIN' - Default domain name, on which "main"
(non-user) site is hosted. Used to prevent redirection to
`DOMAINS_DEFAULT_URL' when `DomainsMiddleware' is used both
on accounts' sites and main site. Also used to construct default
value of `DOMAINS_DEFAULT_URL' when it is not set.
- `DOMAINS_DEFAULT_URL' - URL to redirect to when user agent
refers to site with an unknown domain (not registered in any of
accounts). When not set, a URL is constructed from
`DOMAINS_DEFAULT_DOMAIN' or current Site object's domain and
`DOMAINS_PORT'.
- `DOMAINS_IP' - if set, value is used to verify custom domains
in `DomainForm'. It can be set to a string (literal
'aa.bb.cc.dd' value that is compared to `sockets.gethostbyname()'
result), or, for more complex deployments, it can be a function
that will receive IP as returned by `sockets.gethostbyname()'
- `DOMAINS_PORT' - can be set to custom port that will be used in
Domain site URLs. This way, developer can successfully use
Domains on e.g. 127.0.0.1:8000.
- `DOMAINS_ROOT_DOMAIN' - root domain for subdomains (with or
without leading dot). Must be set.
- `DOMAINS_SUBDOMAIN_STOPWORDS' - tuple of regular expressions
([http://docs.python.org/library/re.html]) that cannot be used as
subdomain names. Default is `("^www$",)'. Use this to stop users
from e.g. using reserved domain names or using profanities as
their domain name. Expressions are tested using `re.search', not
`re.match', so without using `^' anchor they can match anywhere in
the domain name.
- `DOMAINS_THEMES' - a sequence of (codename, name) pairs
indicating available themes for user sites.
- `DOMAINS_USE_SSO' - use django-sso when redirecting user to
newly created site. Default is True if django-sso is available,
False otherwise.
- `DOMAINS_USERSITE_URLCONF' - name of URLconf module for user
sites. This is used by Domain instances' get_absolute_url()
method.

3 Models
~~~~~~~~
Application defines one model, `Domain'. Model has three fields:
- `owner', OneToOneField reference to
`django.contrib.auth.models.User' model, which holds user owning
the account;
- `members', ManyToManyField reference to
`django.contrib.auth.models.User' model, which holds account
members;
- `domain', name of custom full domain for the site, changeable by
user;
- `subdomain', a sub-domain of `DOMAINS_ROOT_DOMAIN', not
editable by user;
- `is_public', boolean. If True (default), DomainMiddleware will
allow any `auth.User' to log in to Domain's account; if False,
only users that are Domain members will be allowed;
Class has one class attribute, `subdomain_root', which contains root
for subdomains as in `DOMAINS_ROOT_DOMAIN' setting description,
always with leading dot. This attribute should not be written.

Model defines `get_absolute_url(path = '/', args = (), kwargs = {})'
method, which returns link to configured domain
([http://subdomain.root_domain/path] if `domain' is None,
[http://domain/path] otherwise). Optional path can be either an
absolute path or, if `settings.DOMAINS_USERSITE_URLCONF' is set,
a name, args and kwargs for reverse URL lookup.

Two methods are defined, `add_member(user)' and
`remove_member(user)' to respectively add or remove `user' from
`members' and send out `domains.signals.add_member' or
`domains.signals.remove_member' with additional `user'
parameter.

3.1 Permissions
===============
- `can_set_custom_domain' enables setting `is_subdomain' to `True'
by the account owner. If Domain owner does not have such
permission, `account_detaul' view hides checkbox for
`is_subdomain', and on form validation `is_subdomain' field is
unconditionally set to `True';
- `can_set_public_status' does the same for `is_public' field.

4 Middleware
~~~~~~~~~~~~
`domains.middleware.DomainsMiddleware' looks at
`request.META['HTTP_HOST']' and, if it matches any `Domain' model
instance:
- sets `request.domain' to that instance (it can be later used by
views and, with `request' context processor, in templates);
- immediately logs out (and redirects to reverse URL lookup of
`domains_not_a_member') any `auth.models.User' that is not this
account's owner or memeber, unless `request.domain.is_public'
is true;
- if `DOMAINS_ACCOUNT_URLCONF' setting is set, sets
`request.urlconf' to its value, allowing single project to display
different URL hierarchies for main site and account sites;

*WARNING*: setting `request.urlconf' doesn't fit well with reverse
URL lookups (those will still be made against root urlconf),
django-debug-toolbar, and probably other things as well. For
maximum reliability, consider running two separate projects on
single database: one for "main" site, other for account domains,
or use single urlconf for both;
- send signal `domains.signals.domain_request' and if any
receiver returns an instance of `HttpResponse', returns this
response instead of actual page. This can be used for
e.g. displaying error message and not allowing to log into expired
accounts.

If current domain doesn't match any of existing Domain instances
and is not `DOMAINS_DEFAULT_DOMAIN', middleware redirects user to
`DOMAINS_DEFAULT_DOMAIN'.

5 Views
~~~~~~~
- `domains.views.create_account' - if logged in user does not
have a Domain, displays a form to create a new one or accepts
results of this form. After accepting form and creating new
account, redirects user to that account, using django-sso if
available. It is not configured in default `urls.py' and should
be added directly in main site's urlconf.
- `domains.views.account_detail' - displays using
`domains/account_detail.html' template and validates
`domains.forms.DomainForm' form, which enables user to
configure account's domain. In supplied `urls.py' this view is
named `domains_account_detail'.
- `domains.views.claim_account' - if `domain.owner' is NULL,
logged in user can "claim" the account, i.e. click a button
directing to this view, which will send an e-mail to
`settings.MANAGERS'. This view should be called with a POST
request. In default `urls.py' this view is named
`domains_claim_account'.
- `domains.views.remove_member' - for Domain_owner, with
`user_id' parameter set, this post will remove user with supplied
ID from the member list. This view should be called with a POST
request. In default `urls.py' this view is called
`domains.views.remove_member'.

6 URLs
~~~~~~
In supplied urlconf, `domains.urls', one external URL is
configured: root for `account_detail' view. More URLs are
configured for various POST actions. This is intended to be
included in the subdomain sites' urlconf.

In main site a link to create account form should be used. Account
is created by view `domains.views.create_account'. Sample
urlconf line is:
(r'^accounts/create-site/$', 'domains.views.create_account'),

7 Templates
~~~~~~~~~~~
Application in default setup needs two templates:
- `domains/account_detail.html' called by `account_detail' view.
Receives two arguments:
- `object' - edited Domain instance, and
- `form' - DomainForm instance to display.
- `domains/create_account.html' called by `create_account' view.
Receives one argument, `form', holding an instance of
DomainCreateForm.
- `domains/claim_account_subject.txt' and
`domains/claim_account_email.txt' - these templates are used by
`claim_account' view to create an e-mail to MANAGERS. This
templates receive three arguments:
- `user' - user that is sending the claim,
- `domain' - an account that is claimed,
- `site' - `sites.Site' object for current site.


8 License
~~~~~~~~~~
This project is licensed on terms of GPL (GPL-LICENSE.txt) licenses.

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