/
forms.py
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/
forms.py
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from __future__ import unicode_literals
from django import forms
from django.utils.translation import ugettext as _
from guardian.shortcuts import assign
from guardian.shortcuts import remove_perm
from guardian.shortcuts import get_perms
from guardian.shortcuts import get_perms_for_model
class BaseObjectPermissionsForm(forms.Form):
"""
Base form for object permissions management. Needs to be extended for usage
with users and/or groups.
"""
def __init__(self, obj, *args, **kwargs):
"""
:param obj: Any instance which form would use to manage object
permissions"
"""
self.obj = obj
super(BaseObjectPermissionsForm, self).__init__(*args, **kwargs)
field_name = self.get_obj_perms_field_name()
self.fields[field_name] = self.get_obj_perms_field()
def get_obj_perms_field(self):
"""
Returns field instance for object permissions management. May be
replaced entirely.
"""
field_class = self.get_obj_perms_field_class()
field = field_class(
label=self.get_obj_perms_field_label(),
choices=self.get_obj_perms_field_choices(),
initial=self.get_obj_perms_field_initial(),
widget=self.get_obj_perms_field_widget(),
required=self.are_obj_perms_required(),
)
return field
def get_obj_perms_field_name(self):
"""
Returns name of the object permissions management field. Default:
``permission``.
"""
return 'permissions'
def get_obj_perms_field_label(self):
"""
Returns label of the object permissions management field. Defualt:
``_("Permissions")`` (marked to be translated).
"""
return _("Permissions")
def get_obj_perms_field_choices(self):
"""
Returns choices for object permissions management field. Default:
list of tuples ``(codename, name)`` for each ``Permission`` instance
for the managed object.
"""
choices = [(p.codename, p.name) for p in get_perms_for_model(self.obj)]
return choices
def get_obj_perms_field_initial(self):
"""
Returns initial object permissions management field choices. Default:
``[]`` (empty list).
"""
return []
def get_obj_perms_field_class(self):
"""
Returns object permissions management field's base class. Default:
``django.forms.MultipleChoiceField``.
"""
return forms.MultipleChoiceField
def get_obj_perms_field_widget(self):
"""
Returns object permissions management field's widget base class.
Default: ``django.forms.SelectMultiple``.
"""
return forms.SelectMultiple
def are_obj_perms_required(self):
"""
Indicates if at least one object permission should be required. Default:
``False``.
"""
return False
def save_obj_perms(self):
"""
Must be implemented in concrete form class. This method should store
selected object permissions.
"""
raise NotImplementedError
class UserObjectPermissionsForm(BaseObjectPermissionsForm):
"""
Object level permissions management form for usage with ``User`` instances.
Example usage::
from django.shortcuts import get_object_or_404
from myapp.models import Post
from guardian.forms import UserObjectPermissionsForm
from django.contrib.auth.models import User
def my_view(request, post_slug, user_id):
user = get_object_or_404(User, id=user_id)
post = get_object_or_404(Post, slug=post_slug)
form = UserObjectPermissionsForm(user, post, request.POST or None)
if request.method == 'POST' and form.is_valid():
form.save_obj_perms()
...
"""
def __init__(self, user, *args, **kwargs):
self.user = user
super(UserObjectPermissionsForm, self).__init__(*args, **kwargs)
def get_obj_perms_field_initial(self):
perms = get_perms(self.user, self.obj)
return perms
def save_obj_perms(self):
"""
Saves selected object permissions by creating new ones and removing
those which were not selected but already exists.
Should be called *after* form is validated.
"""
perms = self.cleaned_data[self.get_obj_perms_field_name()]
model_perms = [c[0] for c in self.get_obj_perms_field_choices()]
to_remove = set(model_perms) - set(perms)
for perm in to_remove:
remove_perm(perm, self.user, self.obj)
for perm in perms:
assign(perm, self.user, self.obj)
class GroupObjectPermissionsForm(BaseObjectPermissionsForm):
"""
Object level permissions management form for usage with ``Group`` instances.
Example usage::
from django.shortcuts import get_object_or_404
from myapp.models import Post
from guardian.forms import GroupObjectPermissionsForm
from guardian.models import Group
def my_view(request, post_slug, group_id):
group = get_object_or_404(Group, id=group_id)
post = get_object_or_404(Post, slug=post_slug)
form = GroupObjectPermissionsForm(group, post, request.POST or None)
if request.method == 'POST' and form.is_valid():
form.save_obj_perms()
...
"""
def __init__(self, group, *args, **kwargs):
self.group = group
super(GroupObjectPermissionsForm, self).__init__(*args, **kwargs)
def get_obj_perms_field_initial(self):
perms = get_perms(self.group, self.obj)
return perms
def save_obj_perms(self):
"""
Saves selected object permissions by creating new ones and removing
those which were not selected but already exists.
Should be called *after* form is validated.
"""
perms = self.cleaned_data[self.get_obj_perms_field_name()]
model_perms = [c[0] for c in self.get_obj_perms_field_choices()]
to_remove = set(model_perms) - set(perms)
for perm in to_remove:
remove_perm(perm, self.group, self.obj)
for perm in perms:
assign(perm, self.group, self.obj)