feat: add library field to v2 public channel metadata API

Co-Authored-By: Claude Sonnet 4.6 <noreply@anthropic.com>

Author: rtibblesbot

contentcuration/kolibri_public/tests/test_channelmetadata_viewset.py

@@ -387,3 +387,45 @@ def test_labels_language_objects_have_id_and_lang_name(self):
         for lang in response.data["languages"]:
             self.assertIn("id", lang)
             self.assertIn("lang_name", lang)
+
+
+class ChannelMetadataLibraryFieldTestCase(StudioAPITestCase):
+    def setUp(self):
+        super().setUp()
+        self.mixer = KolibriPublicMixer()
+        self.user = testdata.user("library@test.com")
+        self.client.force_authenticate(self.user)
+
+    def test_public_channel_returns_library_kolibri(self):
+        """
+        A public channel in the v2 API returns library: "KOLIBRI".
+        """
+        channel = self.mixer.blend(ChannelMetadata, public=True)
+
+        response = self.client.get(
+            reverse_with_query(
+                "publicchannel-detail",
+                args=[channel.id],
+                query={"public": "true"},
+            ),
+        )
+
+        self.assertEqual(response.status_code, 200, response.content)
+        self.assertEqual(response.data["library"], "KOLIBRI")
+
+    def test_non_public_channel_returns_library_community(self):
+        """
+        A non-public channel in the v2 API returns library: "COMMUNITY".
+        """
+        channel = self.mixer.blend(ChannelMetadata, public=False)
+
+        response = self.client.get(
+            reverse_with_query(
+                "publicchannel-detail",
+                args=[channel.id],
+                query={"public": "false"},
+            ),
+        )
+
+        self.assertEqual(response.status_code, 200, response.content)
+        self.assertEqual(response.data["library"], "COMMUNITY")

contentcuration/kolibri_public/views.py

@@ -37,6 +37,7 @@
 from kolibri_public.search import get_contentnode_available_metadata_labels
 from kolibri_public.stopwords import stopwords_set
 from le_utils.constants import content_kinds
+from le_utils.constants import library as library_constants
 from rest_framework import status
 from rest_framework.decorators import action
 from rest_framework.filters import SearchFilter
@@ -252,6 +253,13 @@ def consolidate(self, items, queryset):
             item["countries"] = countries.get(item["id"], [])
             item["token"] = channel_tokens.get(item["id"])
             item["last_published"] = item["last_updated"]
+            # v2 non-public channels are always community library channels (unlike v1
+            # channel tokens, which return null for non-public channels).
+            item["library"] = (
+                library_constants.KOLIBRI
+                if item["public"]
+                else library_constants.COMMUNITY
+            )
 
         return items