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https://gitlab2.federez.net/re2o/re2o
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102 lines
4 KiB
Python
102 lines
4 KiB
Python
# -*- mode: python; coding: utf-8 -*-
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# Re2o est un logiciel d'administration développé initiallement au rezometz. Il
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# se veut agnostique au réseau considéré, de manière à être installable en
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# quelques clics.
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#
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# Copyright © 2017 Gabriel Détraz
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# Copyright © 2017 Goulven Kermarec
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# Copyright © 2017 Augustin Lemesle
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# Copyright © 2018 Maël Kervella
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#
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# This program is free software; you can redistribute it and/or modify
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# it under the terms of the GNU General Public License as published by
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# the Free Software Foundation; either version 2 of the License, or
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# (at your option) any later version.
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#
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# This program is distributed in the hope that it will be useful,
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# but WITHOUT ANY WARRANTY; without even the implied warranty of
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# MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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# GNU General Public License for more details.
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#
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# You should have received a copy of the GNU General Public License along
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# with this program; if not, write to the Free Software Foundation, Inc.,
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# 51 Franklin Street, Fifth Floor, Boston, MA 02110-1301 USA.
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"""re2o.field_permissions
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A model mixin and a field mixin used to remove some unauthorized fields
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from the form automatically generated from the model. The model must
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subclass `FieldPermissionModelMixin` and the form must subclass
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`FieldPermissionFieldMixin` so when a Django form is generated from the
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fields of the models, some fields will be removed if the user don't have
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the rights to change them (can_change_{name})
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"""
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class FieldPermissionModelMixin:
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""" The model mixin. Defines the `has_field_perm` function """
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field_permissions = {} # {'field_name': callable}
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FIELD_PERM_CODENAME = 'can_change_{model}_{name}'
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FIELD_PERMISSION_GETTER = 'can_change_{name}'
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FIELD_PERMISSION_MISSING_DEFAULT = True
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def has_field_perm(self, user, field):
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""" Checks if a `user` has the right to edit the `field`
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of this model """
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if field in self.field_permissions:
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checks = self.field_permissions[field]
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if not isinstance(checks, (list, tuple)):
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checks = [checks]
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else:
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checks = []
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# Consult the optional field-specific hook.
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getter_name = self.FIELD_PERMISSION_GETTER.format(name=field)
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if hasattr(self, getter_name):
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checks.append(getattr(self, getter_name))
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# Try to find a static permission for the field
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else:
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perm_label = self.FIELD_PERM_CODENAME.format(**{
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'model': self._meta.model_name,
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'name': field,
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})
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if perm_label in dict(self._meta.permissions):
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checks.append(perm_label)
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# No requirements means no restrictions.
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if not len(checks):
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return self.FIELD_PERMISSION_MISSING_DEFAULT
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# Try to find a user setting that qualifies them for permission.
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for perm in checks:
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if callable(perm):
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result, _reason = perm(user_request=user)
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if result is not None:
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return result
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else:
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# Don't supply 'obj', or else infinite recursion.
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result = user.has_perm(perm)
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if result:
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return True
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# If no requirement can be met, then permission is denied.
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return False
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class FieldPermissionFormMixin:
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"""
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Construit le formulaire et retire les champs interdits
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"""
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def __init__(self, *args, **kwargs):
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user = kwargs.pop('user')
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super(FieldPermissionFormMixin, self).__init__(*args, **kwargs)
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to_be_deleted = []
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for name in self.fields:
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if not self.instance.has_field_perm(user, field=name):
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to_be_deleted.append(name)
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for name in to_be_deleted:
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self.remove_unauthorized_field(name)
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def remove_unauthorized_field(self, name):
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""" Remove one field from the fields of the form """
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del self.fields[name]
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