Add ACL permission on API

api/permissions.py

@@ -0,0 +1,106 @@
+from rest_framework import permissions
+from re2o.acl import can_create, can_edit, can_delete, can_view_all
+
+class DefaultACLPermission(permissions.BasePermission):
+    """
+    Permission subclass in charge of checking the ACL to determine
+    if a user can access the models
+    """
+    perms_map = {
+        'GET': [lambda model: model.can_view_all],
+        'OPTIONS': [lambda model: model.can_view_all],
+        'HEAD': [lambda model: model.can_view_all],
+        'POST': [lambda model: model.can_create],
+        #'PUT': [],
+        #'PATCH': [],
+        #'DELETE': [],
+    }
+    perms_obj_map = {
+        'GET': [lambda obj: obj.can_view],
+        'OPTIONS': [lambda obj: obj.can_view],
+        'HEAD': [lambda obj: obj.can_view],
+        #'POST': [],
+        'PUT': [lambda obj: obj.can_edit],
+        #'PATCH': [],
+        'DELETE': [lambda obj: obj.can_delete],
+    }
+
+    def get_required_permissions(self, method, model):
+        """
+        Given a model and an HTTP method, return the list of acl
+        functions that the user is required to verify.
+        """
+        if method not in self.perms_map:
+            raise exceptions.MethodNotAllowed(method)
+
+        return [perm(model) for perm in self.perms_map[method]]
+
+    def get_required_object_permissions(self, method, obj):
+        """
+        Given an object and an HTTP method, return the list of acl
+        functions that the user is required to verify.
+        """
+        if method not in self.perms_map:
+            raise exceptions.MethodNotAllowed(method)
+
+        return [perm(obj) for perm in self.perms_map[method]]
+
+    def _queryset(self, view):
+        """
+        Return the queryset associated with view and raise an error
+        is there is none.
+        """
+        assert hasattr(view, 'get_queryset') \
+            or getattr(view, 'queryset', None) is not None, (
+            'Cannot apply {} on a view that does not set '
+            '`.queryset` or have a `.get_queryset()` method.'
+        ).format(self.__class__.__name__)
+
+        if hasattr(view, 'get_queryset'):
+            queryset = view.get_queryset()
+            assert queryset is not None, (
+                '{}.get_queryset() returned None'.format(view.__class__.__name__)
+            )
+            return queryset
+        return view.queryset
+
+    def has_permission(self, request, view):
+        # Workaround to ensure ACLPermissions are not applied
+        # to the root view when using DefaultRouter.
+        if getattr(view, '_ignore_model_permissions', False):
+            return True
+
+        if not request.user or not request.user.is_authenticated:
+            return False
+
+        queryset = self._queryset(view)
+        perms = self.get_required_permissions(request.method, queryset.model)
+
+        return all(perm(request.user)[0] for perm in perms)
+
+    def has_object_permission(self, request, view, obj):
+        # authentication checks have already executed via has_permission
+        queryset = self._queryset(view)
+        user = request.user
+
+        perms = self.get_required_object_permissions(request.method, obj)
+
+        if not all(perm(request.user)[0] for perm in perms):
+            # If the user does not have permissions we need to determine if
+            # they have read permissions to see 403, or not, and simply see
+            # a 404 response.
+
+            if request.method in SAFE_METHODS:
+                # Read permissions already checked and failed, no need
+                # to make another lookup.
+                raise Http404
+
+            read_perms = self.get_required_object_permissions('GET', obj)
+            if not read_perms(request.user)[0]:
+                raise Http404
+
+            # Has read permissions.
+            return False
+
+        return True
+

api/settings.py

@@ -32,6 +32,6 @@ REST_FRAMEWORK = {
         'rest_framework.authentication.SessionAuthentication',
     ),
     'DEFAULT_PERMISSION_CLASSES': (
-        'rest_framework.permissions.IsAuthenticated',
+        'api.permissions.DefaultACLPermission',
     )
 }