feat(playlists): share playlists with revocable read-only links

services/api/internal/playback/playlists.go

@@ -67,17 +67,33 @@ func (h *Handler) ListPlaylists(ctx context.Context, _ gen.ListPlaylistsRequestO
 }
 
 func (h *Handler) playlist(ctx context.Context, user, id uuid.UUID) (gen.Playlist, error) {
+	return h.readPlaylist(ctx, user, id, false)
+}
+
+func (h *Handler) readPlaylist(ctx context.Context, user, id uuid.UUID, shared bool) (gen.Playlist, error) {
 	var out gen.Playlist
 	tx, err := h.store.pool.BeginTx(ctx, pgx.TxOptions{IsoLevel: pgx.RepeatableRead, AccessMode: pgx.ReadOnly})
 	if err != nil {
 		return out, err
 	}
 	defer tx.Rollback(ctx)
-	p, err := scanPlaylist(tx.QueryRow(ctx, playlistSelect+` WHERE p.user_id=$1 AND p.id=$2`, user, id))
+	filter := ` WHERE p.user_id=$1 AND p.id=$2`
+	args := []any{user, id}
+	if shared {
+		filter = ` WHERE p.share_id=$1 AND EXISTS (SELECT 1 FROM users u WHERE u.id=p.user_id AND NOT u.is_blocked)`
+		args = []any{id}
+	}
+	p, err := scanPlaylist(tx.QueryRow(ctx, playlistSelect+filter, args...))
 	if err != nil {
 		return out, err
 	}
-	rows, err := tx.Query(ctx, `SELECT track_id FROM playlist_tracks WHERE playlist_id=$1 ORDER BY position`, id)
+	var shareID *uuid.UUID
+	if !shared {
+		if err = tx.QueryRow(ctx, `SELECT share_id FROM playlists WHERE id=$1`, p.Id).Scan(&shareID); err != nil {
+			return out, err
+		}
+	}
+	rows, err := tx.Query(ctx, `SELECT track_id FROM playlist_tracks WHERE playlist_id=$1 ORDER BY position`, p.Id)
 	if err != nil {
 		return out, err
 	}
@@ -99,7 +115,7 @@ func (h *Handler) playlist(ctx context.Context, user, id uuid.UUID) (gen.Playlis
 	if dtos == nil {
 		dtos = []gen.Track{}
 	}
-	out = gen.Playlist{Id: p.Id, Name: p.Name, Description: p.Description, Revision: p.Revision, CreatedAt: p.CreatedAt, UpdatedAt: p.UpdatedAt, TrackCount: len(dtos), Tracks: dtos}
+	out = gen.Playlist{ShareId: shareID, Id: p.Id, Name: p.Name, Description: p.Description, Revision: p.Revision, CreatedAt: p.CreatedAt, UpdatedAt: p.UpdatedAt, TrackCount: len(dtos), Tracks: dtos}
 	for _, t := range dtos {
 		out.DurationMs += int64(t.DurationMs)
 	}