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re2o/re2o/mixins.py

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7.3 KiB
Python

# -*- mode: python; coding: utf-8 -*-
# Re2o est un logiciel d'administration développé initiallement au rezometz. Il
# se veut agnostique au réseau considéré, de manière à être installable en
# quelques clics.
#
# Copyright © 2018 Gabriel Détraz
# Copyright © 2017 Charlie Jacomme
#
# This program is free software; you can redistribute it and/or modify
# it under the terms of the GNU General Public License as published by
# the Free Software Foundation; either version 2 of the License, or
# (at your option) any later version.
#
# This program is distributed in the hope that it will be useful,
# but WITHOUT ANY WARRANTY; without even the implied warranty of
# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
# GNU General Public License for more details.
#
# You should have received a copy of the GNU General Public License along
# with this program; if not, write to the Free Software Foundation, Inc.,
# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
"""re2o.mixins
A set of mixins used all over the project to avoid duplicating code
"""
from reversion import revisions as reversion
from django.db import transaction
from django.utils.translation import ugettext as _
class RevMixin(object):
""" A mixin to subclass the save and delete function of a model
to enforce the versioning of the object before those actions
really happen """
def save(self, *args, **kwargs):
""" Creates a version of this object and save it to database """
if self.pk is None:
with transaction.atomic(), reversion.create_revision():
reversion.set_comment("Creation")
return super(RevMixin, self).save(*args, **kwargs)
return super(RevMixin, self).save(*args, **kwargs)
def delete(self, *args, **kwargs):
""" Creates a version of this object and delete it from database """
with transaction.atomic(), reversion.create_revision():
reversion.set_comment("Deletion")
return super(RevMixin, self).delete(*args, **kwargs)
class FormRevMixin(object):
""" A mixin to subclass the save function of a form
to enforce the versionning of the object before it is really edited """
def save(self, *args, **kwargs):
""" Create a version of this object and save it to database """
if reversion.get_comment() != "" and self.changed_data != []:
reversion.set_comment(
reversion.get_comment()
+ ",%s" % ", ".join(field for field in self.changed_data)
)
elif self.changed_data:
reversion.set_comment(
"Field(s) edited: %s"
% ", ".join(field for field in self.changed_data)
)
return super(FormRevMixin, self).save(*args, **kwargs)
class AclMixin(object):
"""This mixin is used in nearly every class/models defined in re2o apps.
It is used by acl, in models (decorators can_...) and in templates tags
:get_instance: Applied on a class, take an id argument, return an instance
:can_create: Applied on a class, take the requested user, return if the
user can do the creation
:can_edit: Applied on an instance, return if the user can edit the
instance
:can_delete: Applied on an instance, return if the user can delete the
instance
:can_view: Applied on an instance, return if the user can view the
instance
:can_view_all: Applied on a class, return if the user can view all
instances"""
@classmethod
def get_classname(cls):
""" Returns the name of the class where this mixin is used """
return str(cls.__name__).lower()
@classmethod
def get_modulename(cls):
""" Returns the name of the module where this mixin is used """
return str(cls.__module__).split(".")[0].lower()
@classmethod
def get_instance(cls, *_args, **kwargs):
"""Récupère une instance
:param objectid: Instance id à trouver
:return: Une instance de la classe évidemment"""
object_id = kwargs.get(cls.get_classname() + "id")
return cls.objects.get(pk=object_id)
@classmethod
def can_create(cls, user_request, *_args, **_kwargs):
"""Verifie que l'user a les bons droits pour créer
un object
:param user_request: instance utilisateur qui fait la requête
:return: soit True, soit False avec la raison de l'échec"""
permission = cls.get_modulename() + ".add_" + cls.get_classname()
can = user_request.has_perm(permission)
return (
can,
_("You don't have the right to create a %s object.") % cls.get_classname()
if not can
else None,
(permission,),
)
def can_edit(self, user_request, *_args, **_kwargs):
"""Verifie que l'user a les bons droits pour editer
cette instance
:param self: Instance à editer
:param user_request: Utilisateur qui fait la requête
:return: soit True, soit False avec la raison de l'échec"""
permission = self.get_modulename() + ".change_" + self.get_classname()
can = user_request.has_perm(permission)
return (
can,
_("You don't have the right to edit a %s object.") % self.get_classname()
if not can
else None,
(permission,),
)
def can_delete(self, user_request, *_args, **_kwargs):
"""Verifie que l'user a les bons droits pour delete
cette instance
:param self: Instance à delete
:param user_request: Utilisateur qui fait la requête
:return: soit True, soit False avec la raison de l'échec"""
permission = self.get_modulename() + ".delete_" + self.get_classname()
can = user_request.has_perm(permission)
return (
can,
_("You don't have the right to delete a %s object.") % self.get_classname()
if not can
else None,
(permission,),
)
@classmethod
def can_view_all(cls, user_request, *_args, **_kwargs):
"""Vérifie qu'on peut bien afficher l'ensemble des objets,
droit particulier view objet correspondant
:param user_request: instance user qui fait l'edition
:return: True ou False avec la raison de l'échec le cas échéant"""
permission = cls.get_modulename() + ".view_" + cls.get_classname()
can = user_request.has_perm(permission)
return (
can,
_("You don't have the right to view every %s object.") % cls.get_classname()
if not can
else None,
(permission,),
)
def can_view(self, user_request, *_args, **_kwargs):
"""Vérifie qu'on peut bien voir cette instance particulière avec
droit view objet
:param self: instance à voir
:param user_request: instance user qui fait l'edition
:return: True ou False avec la raison de l'échec le cas échéant"""
permission = self.get_modulename() + ".view_" + self.get_classname()
can = user_request.has_perm(permission)
return (
can,
_("You don't have the right to view a %s object.") % self.get_classname()
if not can
else None,
(permission,),
)