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# coding=utf-8 |
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""" |
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Logical permission backends module |
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""" |
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from permission.conf import settings |
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from permission.utils.handlers import registry |
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from permission.utils.permissions import perm_to_permission |
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__all__ = ('PermissionBackend',) |
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class PermissionBackend(object): |
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""" |
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A handler based permission backend |
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""" |
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supports_object_permissions = True |
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supports_anonymous_user = True |
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supports_inactive_user = True |
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# pylint:disable=unused-argument |
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def authenticate(self, username, password): |
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""" |
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Always return ``None`` to prevent authentication within this backend. |
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""" |
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return None |
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def has_perm(self, user_obj, perm, obj=None): |
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""" |
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Check if user have permission (of object) based on registered handlers. |
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It will raise ``ObjectDoesNotExist`` exception when the specified |
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string permission does not exist and |
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``PERMISSION_CHECK_PERMISSION_PRESENCE`` is ``True`` in ``settings`` |
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module. |
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Parameters |
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---------- |
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user_obj : django user model instance |
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A django user model instance which be checked |
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perm : string |
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`app_label.codename` formatted permission string |
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obj : None or django model instance |
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None or django model instance for object permission |
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Returns |
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------- |
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boolean |
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Whether the specified user have specified permission (of specified |
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object). |
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Raises |
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------ |
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django.core.exceptions.ObjectDoesNotExist |
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If the specified string permission does not exist and |
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``PERMISSION_CHECK_PERMISSION_PRESENCE`` is ``True`` in ``settings`` |
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module. |
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""" |
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if settings.PERMISSION_CHECK_PERMISSION_PRESENCE: |
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# get permission instance from string permission (perm) |
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# it raise ObjectDoesNotExists when the permission is not exists |
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try: |
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perm_to_permission(perm) |
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except AttributeError: |
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# Django 1.2 internally use wrong permission string thus ignore |
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pass |
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# get permission handlers fot this perm |
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cache_name = '_%s_cache' % perm |
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if hasattr(self, cache_name): |
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handlers = getattr(self, cache_name) |
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else: |
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handlers = [h for h in registry.get_handlers() |
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if perm in h.get_supported_permissions()] |
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setattr(self, cache_name, handlers) |
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for handler in handlers: |
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if handler.has_perm(user_obj, perm, obj=obj): |
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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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""" |
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Check if user have permission of specified app based on registered |
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handlers. |
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It will raise ``ObjectDoesNotExist`` exception when the specified |
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string permission does not exist and |
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``PERMISSION_CHECK_PERMISSION_PRESENCE`` is ``True`` in ``settings`` |
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module. |
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Parameters |
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---------- |
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user_obj : django user model instance |
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A django user model instance which is checked |
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app_label : string |
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`app_label.codename` formatted permission string |
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Returns |
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------- |
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boolean |
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Whether the specified user have specified permission. |
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Raises |
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------ |
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django.core.exceptions.ObjectDoesNotExist |
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If the specified string permission does not exist and |
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``PERMISSION_CHECK_PERMISSION_PRESENCE`` is ``True`` in ``settings`` |
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module. |
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""" |
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# get permission handlers fot this perm |
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cache_name = '_%s_cache' % app_label |
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if hasattr(self, cache_name): |
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handlers = getattr(self, cache_name) |
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else: |
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handlers = [h for h in registry.get_handlers() |
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if app_label in h.get_supported_app_labels()] |
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setattr(self, cache_name, handlers) |
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for handler in handlers: |
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if handler.has_module_perms(user_obj, app_label): |
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return True |
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return False |
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lambdalisue /
django-permission
