feat: add is_writable show filter

program/filters.py

@@ -5,6 +5,7 @@ from django_filters import rest_framework as filters
 from django_filters import widgets
 
 from django import forms
+from django.conf import settings
 from django.db.models import Exists, OuterRef, Q, QuerySet
 from django.utils import timezone
 from program import models
@@ -80,6 +81,10 @@ class ShowFilterSet(StaticFilterHelpTextMixin, filters.FilterSet):
             "or past or upcoming shows if false."
         ),
     )
+    is_writable = filters.BooleanFilter(
+        method="filter_writable",
+        help_text="Return only shows writable by the requesting authenticated user.",
+    )
     is_public = filters.BooleanFilter(
         field_name="is_public",
         help_text="Return only shows that are public/non-public.",
@@ -145,6 +150,20 @@ class ShowFilterSet(StaticFilterHelpTextMixin, filters.FilterSet):
         else:
             return queryset.exclude(id__in=show_ids, is_active=True)
 
+    def filter_writable(self, queryset: QuerySet, _: str, value: bool) -> QuerySet:
+        user = self.request.user if self.request.user.is_authenticated else None
+
+        user_is_privileged = (
+            user.groups.filter(name=settings.PRIVILEGED_GROUP).exists() if user else False
+        )
+
+        if value and user_is_privileged:
+            return queryset
+        elif value and user:
+            return queryset.filter(owners=user)
+        else:
+            return models.Show.objects.none()
+
     class Meta:
         model = models.Show
         fields = [
@@ -154,6 +173,7 @@ class ShowFilterSet(StaticFilterHelpTextMixin, filters.FilterSet):
             "host_ids",
             "is_active",
             "is_public",
+            "is_writable",
             "language_ids",
             "music_focus_ids",
             "music_focus_slug",