Improve the DRF API

umap/api_views.py

@@ -1,4 +1,6 @@
+from django.shortcuts import get_object_or_404
 from rest_framework import generics, status
+from rest_framework.permissions import BasePermission
 from rest_framework.response import Response
 
 from .models import Map
@@ -16,23 +18,6 @@ class MapList(generics.ListCreateAPIView):
         else:
             serializer.save()
 
-    def get_map_permissions(self, map_):
-        permissions = {}
-        permissions["edit_status"] = map_.edit_status
-        permissions["share_status"] = map_.share_status
-        if map_.owner:
-            permissions["owner"] = {
-                "id": map_.owner.pk,
-                "name": str(map_.owner),
-                "url": map_.owner.get_url(),
-            }
-            permissions["editors"] = [
-                {"id": editor.pk, "name": str(editor)} for editor in map_.editors.all()
-            ]
-        if not map_.owner and map_.is_anonymous_owner(self.request):
-            permissions["anonymous_edit_url"] = map_.get_anonymous_edit_url()
-        return permissions
-
     def create(self, request, *args, **kwargs):
         serializer = self.get_serializer(data=request.data)
         serializer.is_valid(raise_exception=True)
@@ -40,11 +25,9 @@ class MapList(generics.ListCreateAPIView):
         map_ = serializer.instance
         headers = self.get_success_headers(serializer.data)
         data = serializer.data
-        permissions = self.get_map_permissions(map_)
         if not map_.owner:
             anonymous_url = map_.get_anonymous_edit_url()
-            permissions["anonymous_edit_url"] = anonymous_url
+            data["permissions"]["anonymous_edit_url"] = anonymous_url
-        data["permissions"] = permissions
         response = Response(data, status=status.HTTP_201_CREATED, headers=headers)
         if not self.request.user.is_authenticated:
             key, value = map_.signed_cookie_elements
@@ -54,6 +37,27 @@ class MapList(generics.ListCreateAPIView):
         return response
 
 
+class MapPermission(BasePermission):
+    def has_permission(self, request, view):
+        map_inst = get_object_or_404(Map, pk=view.kwargs.get("pk"))
+        if request.method == "PUT":
+            return map_inst.can_edit(user=request.user, request=request)
+        if request.method == "GET":
+            return map_inst.can_view(request)
+
+
 class MapDetail(generics.RetrieveUpdateDestroyAPIView):
     queryset = Map.public.all().order_by("-modified_at")
     serializer_class = MapSerializer
+
+    permission_classes = [MapPermission]
+
+    def retrieve(self, request, *args, **kwargs):
+        instance = self.get_object()
+        serializer = self.get_serializer(instance)
+        data = serializer.data
+        if not instance.owner and instance.is_anonymous_owner(request):
+            data["permissions"][
+                "anonymous_edit_url"
+            ] = instance.get_anonymous_edit_url()
+        return Response(data)

umap/decorators.py

@@ -33,7 +33,7 @@ def can_edit_map(view_func):
 
     @wraps(view_func)
     def wrapper(request, *args, **kwargs):
-        map_inst = get_object_or_404(Map, pk=kwargs.get("map_id", kwargs.get("pk")))
+        map_inst = get_object_or_404(Map, pk=kwargs["map_id"])
         user = request.user
         kwargs["map_inst"] = map_inst  # Avoid rerequesting the map in the view
         if map_inst.edit_status >= map_inst.EDITORS:
@@ -54,7 +54,7 @@ def can_view_map(view_func):
 
     @wraps(view_func)
     def wrapper(request, *args, **kwargs):
-        map_inst = get_object_or_404(Map, pk=kwargs.get("map_id", kwargs.get("pk")))
+        map_inst = get_object_or_404(Map, pk=kwargs["map_id"])
         kwargs["map_inst"] = map_inst  # Avoid rerequesting the map in the view
         if not map_inst.can_view(request):
             return HttpResponseForbidden()

umap/serializers.py

@@ -16,10 +16,26 @@ DEFAULT_CENTER = Point(DEFAULT_LONGITUDE, DEFAULT_LATITUDE)
 
 class MapSerializer(serializers.HyperlinkedModelSerializer):
     slug = serializers.CharField(required=False)
+    permissions = serializers.SerializerMethodField()
 
     class Meta:
         model = Map
-        fields = ["id", "name", "slug", "center", "settings"]
+        fields = ["id", "name", "slug", "center", "settings", "permissions"]
+
+    def get_permissions(self, obj):
+        permissions = {}
+        permissions["edit_status"] = obj.edit_status
+        permissions["share_status"] = obj.share_status
+        if obj.owner:
+            permissions["owner"] = {
+                "id": obj.owner.pk,
+                "name": str(obj.owner),
+                "url": obj.owner.get_url(),
+            }
+            permissions["editors"] = [
+                {"id": editor.pk, "name": str(editor)} for editor in obj.editors.all()
+            ]
+        return permissions
 
     def validate(self, data):
         slug = data.get("slug")

umap/urls.py

@@ -63,6 +63,11 @@ i18n_urls = [
         views.PictogramJSONList.as_view(),
         name="pictogram_list_json",
     ),
+    re_path(
+        r"^api/map/(?P<pk>[\d]+)/$",
+        api_views.MapDetail.as_view(),
+        name="map_detail",
+    ),
 ]
 i18n_urls += decorated_patterns(
     [can_view_map, cache_control(must_revalidate=True)],
@@ -115,11 +120,6 @@ i18n_urls += decorated_patterns(
     ),
 )
 map_urls = [
-    re_path(
-        r"^api/map/(?P<pk>[\d]+)/$",
-        api_views.MapDetail.as_view(),
-        name="map_detail",
-    ),
     re_path(
         r"^map/(?P<map_id>[\d]+)/update/permissions/$",
         views.UpdateMapPermissions.as_view(),