Add needed scopes to LiveDocumentShowAPIView

(cherry picked from commit ab4b4dcf)

aleksis/apps/resint/views.py

-from typing import Any, Dict, Type
+from typing import Any, Dict, List, Type
 
 from django.contrib.contenttypes.models import ContentType
 from django.db.models import QuerySet
@@ -15,7 +15,7 @@ from django.views.generic.list import ListView
 
 from django_tables2 import SingleTableView
 from guardian.shortcuts import get_objects_for_user
-from oauth2_provider.views.mixins import ClientProtectedResourceMixin
+from oauth2_provider.views.mixins import ClientProtectedResourceMixin, ScopedResourceMixin
 from reversion.views import RevisionMixin
 from rules.contrib.views import PermissionRequiredMixin
 
@@ -241,5 +241,11 @@ class LiveDocumentShowView(PermissionRequiredMixin, LiveDocumentShowBaseView):
     permission_required = "resint.view_livedocument_rule"
 
 
-class LiveDocumentShowAPIView(ClientProtectedResourceMixin, LiveDocumentShowBaseView):
+class LiveDocumentShowAPIView(
+    ScopedResourceMixin, ClientProtectedResourceMixin, LiveDocumentShowBaseView
+):
     """Show the current version of the live document in API."""
+
+    def get_scopes(self, *args, **kwargs) -> List[str]:
+        """Return the scope needed to access the PDF file."""
+        return [self.get_object().scope]