feat(backend): add playlist cover endpoint and relax description validation

Adds GET /playlists/{id}/cover (mirrors the track cover endpoint) so uploaded playlist pictures can actually be served. Also drops the NotEmpty rule on playlist description, which rejected the blank description the frontend treats as optional; CreatePlayList now falls back to the domain's default text instead.
2026-07-15 16:09:40 +02:00
parent b0e4ec650a
commit 461bae1b01
5 changed files with 80 additions and 3 deletions
@@ -0,0 +1,49 @@
+using ErrorOr;
+using Mediator;
+using Microsoft.EntityFrameworkCore;
+using MimeMapping;
+using Musify.Application.Configuration;
+using Musify.Application.Contracts;
+
+namespace Musify.Application.PlayLists
+{
+    public record GetPlayListCoverQuery(Guid PlayListId, string Size)
+        : IQuery<ErrorOr<PlayListCoverLocation>>;
+
+    public record PlayListCoverLocation(string Bucket, string Key, string ContentType);
+
+    public class GetPlayListCoverQueryHandler(
+        IDatabase database,
+        ApplicationStorageConfiguration storageConfiguration,
+        PlayListConfiguration playListConfiguration)
+        : IQueryHandler<GetPlayListCoverQuery, ErrorOr<PlayListCoverLocation>>
+    {
+        public async ValueTask<ErrorOr<PlayListCoverLocation>> Handle(GetPlayListCoverQuery request, CancellationToken cancellationToken)
+        {
+            var playList = await database.PlayLists.AsNoTracking()
+                .Where(p => p.Id == request.PlayListId)
+                .Select(p => new { p.SmallPictureName, p.MediumPictureName, p.LargePictureName })
+                .SingleOrDefaultAsync(cancellationToken);
+
+            if (playList == null)
+                return Error.NotFound();
+
+            var routes = playListConfiguration.Routes;
+            var (name, key, presetName) = request.Size.ToLowerInvariant() switch
+            {
+                "small" => (playList.SmallPictureName, BuildKey(routes.BuildSmallPicturePath, playList.SmallPictureName), routes.PresetSmallPicture),
+                "large" => (playList.LargePictureName, BuildKey(routes.BuildLargePicturePath, playList.LargePictureName), routes.PresetLargePicture),
+                _ => (playList.MediumPictureName, BuildKey(routes.BuildMediumPicturePath, playList.MediumPictureName), routes.PresetMediumPicture)
+            };
+
+            if (string.IsNullOrEmpty(name) || string.IsNullOrEmpty(key) || name == presetName)
+                return Error.NotFound();
+
+            var contentType = MimeUtility.GetMimeMapping(name);
+            return new PlayListCoverLocation(storageConfiguration.Bucket, key, contentType);
+        }
+
+        private static string? BuildKey(Func<string, string> builder, string? name)
+            => string.IsNullOrEmpty(name) ? null : builder(name);
+    }
+}