mirror of
https://gitlab2.federez.net/re2o/re2o
synced 2024-11-05 09:26:27 +00:00
112 lines
4.1 KiB
Python
112 lines
4.1 KiB
Python
from rest_framework import permissions, exceptions
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from re2o.acl import can_create, can_edit, can_delete, can_view_all
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from . import acl
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def can_see_api(_):
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return lambda user: acl.can_view(user)
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class DefaultACLPermission(permissions.BasePermission):
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"""
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Permission subclass in charge of checking the ACL to determine
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if a user can access the models
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"""
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perms_map = {
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'GET': [can_see_api, lambda model: model.can_view_all],
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'OPTIONS': [can_see_api, lambda model: model.can_view_all],
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'HEAD': [can_see_api, lambda model: model.can_view_all],
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'POST': [can_see_api, lambda model: model.can_create],
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'PUT': [], # No restrictions, apply to objects
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'PATCH': [], # No restrictions, apply to objects
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'DELETE': [], # No restrictions, apply to objects
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}
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perms_obj_map = {
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'GET': [can_see_api, lambda obj: obj.can_view],
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'OPTIONS': [can_see_api, lambda obj: obj.can_view],
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'HEAD': [can_see_api, lambda obj: obj.can_view],
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'POST': [], # No restrictions, apply to models
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'PUT': [can_see_api, lambda obj: obj.can_edit],
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'PATCH': [can_see_api, lambda obj: obj.can_edit],
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'DELETE': [can_see_api, lambda obj: obj.can_delete],
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}
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def get_required_permissions(self, method, model):
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"""
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Given a model and an HTTP method, return the list of acl
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functions that the user is required to verify.
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"""
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if method not in self.perms_map:
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raise exceptions.MethodNotAllowed(method)
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return [perm(model) for perm in self.perms_map[method]]
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def get_required_object_permissions(self, method, obj):
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"""
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Given an object and an HTTP method, return the list of acl
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functions that the user is required to verify.
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"""
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if method not in self.perms_map:
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raise exceptions.MethodNotAllowed(method)
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return [perm(obj) for perm in self.perms_map[method]]
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def _queryset(self, view):
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"""
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Return the queryset associated with view and raise an error
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is there is none.
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"""
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assert hasattr(view, 'get_queryset') \
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or getattr(view, 'queryset', None) is not None, (
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'Cannot apply {} on a view that does not set '
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'`.queryset` or have a `.get_queryset()` method.'
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).format(self.__class__.__name__)
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if hasattr(view, 'get_queryset'):
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queryset = view.get_queryset()
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assert queryset is not None, (
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'{}.get_queryset() returned None'.format(view.__class__.__name__)
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)
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return queryset
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return view.queryset
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def has_permission(self, request, view):
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# Workaround to ensure ACLPermissions are not applied
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# to the root view when using DefaultRouter.
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if getattr(view, '_ignore_model_permissions', False):
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return True
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if not request.user or not request.user.is_authenticated:
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return False
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queryset = self._queryset(view)
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perms = self.get_required_permissions(request.method, queryset.model)
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return all(perm(request.user)[0] for perm in perms)
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def has_object_permission(self, request, view, obj):
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# authentication checks have already executed via has_permission
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queryset = self._queryset(view)
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user = request.user
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perms = self.get_required_object_permissions(request.method, obj)
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if not all(perm(request.user)[0] for perm in perms):
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# If the user does not have permissions we need to determine if
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# they have read permissions to see 403, or not, and simply see
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# a 404 response.
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if request.method in SAFE_METHODS:
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# Read permissions already checked and failed, no need
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# to make another lookup.
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raise Http404
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read_perms = self.get_required_object_permissions('GET', obj)
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if not read_perms(request.user)[0]:
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raise Http404
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# Has read permissions.
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return False
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return True
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