Add dref global files api (#2466)

Author: susilnem

dref/serializers.py

@@ -1416,3 +1416,7 @@ class DrefShareUserSerializer(serializers.ModelSerializer):
     class Meta:
         model = Dref
         fields = ("id", "users", "users_details")
+
+
+class DrefGlobalFilesSerializer(serializers.Serializer):
+    budget_template_url = serializers.CharField(read_only=True)

dref/views.py

@@ -1,6 +1,7 @@
 import django.utils.timezone as timezone
 from django.contrib.auth.models import Permission
 from django.db import models
+from django.templatetags.static import static
 from django.utils.translation import gettext
 from drf_spectacular.utils import extend_schema
 from rest_framework import (
@@ -30,6 +31,7 @@
     DrefFileInputSerializer,
     DrefFileSerializer,
     DrefFinalReportSerializer,
+    DrefGlobalFilesSerializer,
     DrefOperationalUpdateSerializer,
     DrefSerializer,
     DrefShareUserSerializer,
@@ -86,6 +88,24 @@ def get_published(self, request, pk=None, version=None):
         serializer = DrefSerializer(dref, context={"request": request})
         return response.Response(serializer.data)
 
+    @extend_schema(request=None, responses=DrefGlobalFilesSerializer)
+    @action(
+        detail=False,
+        url_path="global-files",
+        methods=["get"],
+        serializer_class=DrefGlobalFilesSerializer,
+        permission_classes=[permissions.IsAuthenticated, DenyGuestUserPermission],
+    )
+    def get_global_files(self, request, pk=None, version=None):
+        """
+        Dref global files url
+        """
+        return response.Response(
+            DrefGlobalFilesSerializer(
+                {"budget_template_url": request.build_absolute_uri(static("files/dref/budget_template.xlsm"))}
+            ).data
+        )
+
 
 class DrefOperationalUpdateViewSet(RevisionMixin, viewsets.ModelViewSet):
     serializer_class = DrefOperationalUpdateSerializer