mirror of https://gitlab.crans.org/bde/nk20
118 lines
4.3 KiB
Python
118 lines
4.3 KiB
Python
# Copyright (C) 2018-2020 by BDE ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
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from django.contrib.auth.backends import ModelBackend
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from django.contrib.auth.models import User, AnonymousUser
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from django.contrib.contenttypes.models import ContentType
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from django.db.models import Q, F
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from note.models import Note, NoteUser, NoteClub, NoteSpecial
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from note_kfet.middlewares import get_current_session
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from member.models import Membership, Club
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from .models import Permission
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class PermissionBackend(ModelBackend):
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"""
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Manage permissions of users
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"""
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supports_object_permissions = True
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supports_anonymous_user = False
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supports_inactive_user = False
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@staticmethod
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def permissions(user, model, type):
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"""
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List all permissions of the given user that applies to a given model and a give type
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:param user: The owner of the permissions
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:param model: The model that the permissions shoud apply
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:param type: The type of the permissions: view, change, add or delete
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:return: A generator of the requested permissions
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"""
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for permission in Permission.objects.annotate(club=F("rolepermissions__role__membership__club")) \
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.filter(
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rolepermissions__role__membership__user=user,
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rolepermissions__role__membership__valid=True,
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model__app_label=model.app_label, # For polymorphic models, we don't filter on model type
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type=type,
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).all():
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if not isinstance(model, permission.model.__class__) or not permission.club:
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continue
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club = Club.objects.get(pk=permission.club)
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permission = permission.about(
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user=user,
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club=club,
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User=User,
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Club=Club,
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Membership=Membership,
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Note=Note,
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NoteUser=NoteUser,
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NoteClub=NoteClub,
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NoteSpecial=NoteSpecial,
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F=F,
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Q=Q
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)
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if permission.mask.rank <= get_current_session().get("permission_mask", 0):
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yield permission
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@staticmethod
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def filter_queryset(user, model, t, field=None):
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"""
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Filter a queryset by considering the permissions of a given user.
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:param user: The owner of the permissions that are fetched
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:param model: The concerned model of the queryset
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:param t: The type of modification (view, add, change, delete)
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:param field: The field of the model to test, if concerned
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:return: A query that corresponds to the filter to give to a queryset
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"""
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if user is None or isinstance(user, AnonymousUser):
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# Anonymous users can't do anything
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return Q(pk=-1)
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if user.is_superuser and get_current_session().get("permission_mask", 0) >= 42:
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# Superusers have all rights
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return Q()
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if not isinstance(model, ContentType):
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model = ContentType.objects.get_for_model(model)
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# Never satisfied
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query = Q(pk=-1)
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perms = PermissionBackend.permissions(user, model, t)
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for perm in perms:
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if perm.field and field != perm.field:
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continue
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if perm.type != t or perm.model != model:
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continue
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perm.update_query()
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query = query | perm.query
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return query
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def has_perm(self, user_obj, perm, obj=None):
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if user_obj is None or isinstance(user_obj, AnonymousUser):
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return False
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if user_obj.is_superuser and get_current_session().get("permission_mask", 0) >= 42:
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return True
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if obj is None:
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return True
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perm = perm.split('.')[-1].split('_', 2)
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perm_type = perm[0]
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perm_field = perm[2] if len(perm) == 3 else None
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ct = ContentType.objects.get_for_model(obj)
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if any(permission.applies(obj, perm_type, perm_field)
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for permission in self.permissions(user_obj, ct, perm_type)):
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return True
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return False
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def has_module_perms(self, user_obj, app_label):
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return False
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def get_all_permissions(self, user_obj, obj=None):
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ct = ContentType.objects.get_for_model(obj)
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return list(self.permissions(user_obj, ct, "view"))
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