Subsonic: Actually implement getArtistInfo2 endpoint

Part-of: <https://dev.funkwhale.audio/funkwhale/funkwhale/-/merge_requests/2695>

api/funkwhale_api/subsonic/views.py

@@ -269,7 +269,20 @@ class SubsonicViewSet(viewsets.GenericViewSet):
     )
     @find_object(music_models.Artist.objects.all(), filter_playable=True)
     def get_artist_info2(self, request, *args, **kwargs):
-        payload = {"artist-info2": {}}
+        artist = kwargs.pop("obj")
+        artist_info = {}
+        if artist.mbid:
+            artist_info["musicBrainzId"] = [str(artist.mbid)]
+        if artist.attachment_cover:
+            artist_info["mediumImageUrl"] = [
+                artist.attachment_cover.download_url_medium_square_crop
+            ]
+            artist_info["largeImageUrl"] = [
+                artist.attachment_cover.download_url_large_square_crop
+            ]
+        if artist.description:
+            artist_info["biography"] = [artist.description.rendered]
+        payload = {"artistInfo2": artist_info}
 
         return response.Response(payload, status=200)
 

api/tests/subsonic/test_views.py

@@ -166,7 +166,11 @@ def test_get_artist_info2(
     artist = factories["music.Artist"](playable=True)
     playable_by = mocker.spy(music_models.ArtistQuerySet, "playable_by")
 
-    expected = {"artist-info2": {}}
+    expected = {
+        "artistInfo2": {
+            "musicBrainzId": [artist.mbid],
+        }
+    }
     response = logged_in_api_client.get(url, {"id": artist.pk})
 
     assert response.status_code == 200

changes/changelog.d/subsonic-artistinfo2.feature

@@ -0,0 +1 @@
+Implement Subsonic getArtistInfo2 response