mirror of
https://gitlab.crans.org/bde/nk20
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114 lines
4.2 KiB
Python
114 lines
4.2 KiB
Python
# Copyright (C) 2018-2021 by BDE ENS Paris-Saclay
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# SPDX-License-Identifier: GPL-3.0-or-later
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from django.core.exceptions import PermissionDenied
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from django.utils.translation import gettext_lazy as _
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from note_kfet.middlewares import get_current_request
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from permission.backends import PermissionBackend
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EXCLUDED = [
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'cas_server.proxygrantingticket',
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'cas_server.proxyticket',
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'cas_server.serviceticket',
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'cas_server.user',
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'cas_server.userattributes',
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'contenttypes.contenttype',
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'logs.changelog',
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'migrations.migration',
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'oauth2_provider.accesstoken',
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'oauth2_provider.grant',
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'oauth2_provider.refreshtoken',
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'sessions.session',
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]
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def pre_save_object(sender, instance, **kwargs):
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"""
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Before a model get saved, we check the permissions
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"""
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# noinspection PyProtectedMember
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if instance._meta.label_lower in EXCLUDED:
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return
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if hasattr(instance, "_force_save") or hasattr(instance, "_no_signal"):
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return
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request = get_current_request()
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if request is None:
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# Action performed on shell is always granted
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return
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qs = sender.objects.filter(pk=instance.pk).all()
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model_name_full = instance._meta.label_lower.split(".")
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app_label = model_name_full[0]
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model_name = model_name_full[1]
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if qs.exists():
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# We check if the user can change the model
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# If the user has all right on a model, then OK
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if PermissionBackend.check_perm(request, app_label + ".change_" + model_name, instance):
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return
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# In the other case, we check if he/she has the right to change one field
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previous = qs.get()
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for field in instance._meta.fields:
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field_name = field.name
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old_value = getattr(previous, field.name)
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new_value = getattr(instance, field.name)
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# If the field wasn't modified, no need to check the permissions
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if old_value == new_value:
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continue
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if app_label == 'auth' and model_name == 'user' and field.name == 'password' and request.user.is_anonymous:
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# We must ignore password changes from anonymous users since it can be done by people that forgot
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# their password. We trust password change form.
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continue
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if not PermissionBackend.check_perm(request, app_label + ".change_" + model_name + "_" + field_name,
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instance):
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raise PermissionDenied(
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_("You don't have the permission to change the field {field} on this instance of model"
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" {app_label}.{model_name}.")
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.format(field=field_name, app_label=app_label, model_name=model_name, )
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)
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else:
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# We check if the user has right to add the object
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has_perm = PermissionBackend.check_perm(request, app_label + ".add_" + model_name, instance)
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if not has_perm:
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raise PermissionDenied(
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_("You don't have the permission to add an instance of model {app_label}.{model_name}.")
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.format(app_label=app_label, model_name=model_name, ))
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def pre_delete_object(instance, **kwargs):
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"""
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Before a model get deleted, we check the permissions
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"""
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# noinspection PyProtectedMember
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if instance._meta.label_lower in EXCLUDED:
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return
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if hasattr(instance, "_force_delete") or hasattr(instance, "pk") and instance.pk == 0 \
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or hasattr(instance, "_no_signal"):
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# Don't check permissions on force-deleted objects
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return
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request = get_current_request()
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if request is None:
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# Action performed on shell is always granted
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return
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model_name_full = instance._meta.label_lower.split(".")
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app_label = model_name_full[0]
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model_name = model_name_full[1]
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# We check if the user has rights to delete the object
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if not PermissionBackend.check_perm(request, app_label + ".delete_" + model_name, instance):
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raise PermissionDenied(
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_("You don't have the permission to delete this instance of model {app_label}.{model_name}.")
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.format(app_label=app_label, model_name=model_name))
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