Skip to main content

A enhanced permission system which enable object permission and role based permission

Project description

**********************************
djagno-permission
**********************************

django-permission is an enhanced permission system which support object permission and role based permission system.

**This is under development. The codes below may not works in the future**

Install
==============
django-permission is in PyPI_ so::

$ pip install django-permission

or

$ pip install git+git://github.com/lambdalisue/django-permission.git#egg=django-permission

Quick tutorial
============================

1. Add ``'permission'`` to ``INSTALLED_APPS`` of your ``settings.py`` and confirm
''django.contrib.auth' and 'django.contrib.contenttypes' is in ``INSTALLED_APPS``

.. Note::
django-permission can use `django-fenicms <https://github.com/matiasb/fenics>`_ to improve
the visual design of change_list page in django admin if available. Add 'fenicms' to
your ``INSTALLED_APPS`` to enable AJAX sorting, adding, expanding features.

2. Add ``'permission.backends.PermissionBackend'`` to ``AUTHENTICATION_BACKENDS``
of your ``settings.py``. If you cannot existing settings, simply add
following code::

AUTHENTICATION_BACKENDS = (
'django.contrib.auth.backends.ModelBackend',
'permission.backends.RoleBackend',
'permission.backends.PermissionBackend',
)

3. Add ``permissions.py`` to the directory which contains ``models.py``. And
write following codes for starting::

from permission import registry
from permission import PermissionHandler

from models import YourModel

class YourModelPermissionHandler(PermissionHandler):
"""Permission handler class for ``YourModel``. Similar with AdminSite"""
def has_perm(self, user_obj, perm, obj=None):
"""this is called for checking permission of the model."""
if user_obj.is_authenticated():
if perm == 'yourapp.add_yourmodel':
# Authenticated user has add permissions of this model
return True
elif obj and obj.author == user_obj:
# Otherwise (change/delete) user must be an author
return True
# User doesn't have permission of ``perm``
return False

# register this ``YourModelPermissionHandler`` with ``YourModel``
registry.register(YourModel, YourModelPermissionHandler)

4. ``has`` and ``of`` keyword is added to ``if`` in template. You can check permission
as::

{% if user has 'blog.add_entry' %}
<p>You can add entry</p>
{% endif %}
{% if object and user has 'blog.change_entry' of object or user has 'blog.delete_entry' of object %}
<!-- object is exist and user can change or delete this object. -->
<div class="control-panel">
{% if user has 'blog.change_entry' of object %}
<p>You can change this entry.</p>
{% endif %}
{% if user has 'blog.delete_entry' of object %}
<p>You can delete this entry.</p>
{% endif %}
</div>
{% endif %}

.. Note::
If you don't want django-permission to replace builtin ``if`` tag, set
``PERMISSION_REPLATE_BUILTIN_IF`` to ``False`` in your ``settings.py``.
Then you have to use ``{% permission %}`` templatetag as::

{% permission user has 'blog.add_entry' %}
<p>You can add entry</p>
{% endpermission %}

``{% permission %}`` tag is exactuly same as ``{% if %}`` thus you can use
``{% elpermission %}`` for ``{% elif %}`` and ``{% else %}``.


Role?
==========

django-permission has role based permission system. visit your django admin page to create/modify roles (See the screenshots below).
The role permissions are handled with ``permission.backends.RoleBackend``.

.. image:: http://s1-01.twitpicproxy.com/photos/full/528601159.png?key=943727
:align: center

.. image:: http://s1-04.twitpicproxy.com/photos/full/528601385.png?key=9431458
:align: center

.. Note::
Role based permission system does not support object permission and anonymous permission.
However these permissions are handled with Individual handler based permission backend
(``permission.backends.PermissionBackend``)


Regulate permissions treated in PermissionHandler
==================================================================================================

``PermissionHandler`` treat all permissions related to the model registered
with in default. But sometime you may want to exclude some permissions or
include some permissions. To regulate permissions treated, use ``includes``
and ``excludes`` attributes.

``includes`` attribute is set to
``permissions.handlers.base.get_model_permissions`` function in default. That's mean
your newly created ``PermissionHandler`` will treat all permissions which related
to the model. If you want to specify permissions, set a list/tuple or a
function which have one argument. The ``PermissionHandler`` instance will be
given as first argument.

``excludes`` attribute is set to ``None`` in default. If you want to exclude
some permissions from ``includes``, set a list/tuple or a function which
treated same as the function used in ``includes``.

Example usage::

from permission import registry
from permission import PermissionHandler

from models import YourModel
from models import HisModel
from models import HerModel

class AppPermissionHandler(PermissionHandler):
# this handler treat all permissions related to this app (myapp)
includes = lambda self: self.get_all_permissions()

# except permissions for adding models.
excludes = (
'myapp.add_yourmodel',
'myapp.add_hismodel',
'myapp.add_hermodel',
)

def has_perm(self, user_obj, perm, obj=None):
codename = self.get_permission_codename()
# permissions for adding models are excluded with
# ``excludes`` attribute thus the code below never
# fail.
assert codename.startswith('add_')
if perm.endswith('_yourmodel'):
# All user has all permissions for ``YourModel``
return True
elif perm.endswith('_hismodel'):
if user_obj.is_authenticated():
# only authenticated user has all permissions for ``HisModel``
return True
elif perm.endswith('_hermodel'):
if user_obj.is_staff:
# only staff user has all permissions for ``HerModel``
return True
return False

# you have to register the handler with the model
# even AppPermissionHandler doesn't care about model
registry.register(YourModel, AppPermissionHandler)
# registry.register(HisModel, AppPermissionHandler) # or you can register with HisModel
# registry.register(HerModel, AppPermissionHandler) # or you can register with HerModel


.. Note::
If you use ``user.has_perm()`` method in ``has_perm()`` method of
``PermissionHandler``, make sure the permission is not treated with the
handler.

Project details


Download files

Download the file for your platform. If you're not sure which to choose, learn more about installing packages.

Source Distribution

django-permission-0.4.2.tar.gz (41.5 kB view hashes)

Uploaded Source

Supported by

AWS AWS Cloud computing and Security Sponsor Datadog Datadog Monitoring Fastly Fastly CDN Google Google Download Analytics Microsoft Microsoft PSF Sponsor Pingdom Pingdom Monitoring Sentry Sentry Error logging StatusPage StatusPage Status page