Subsonic: playlist endpoints (getPlaylists, getPlaylist, createPlaylist, updatePlaylist, deletePlaylist)

internal/database/playlists.go

@@ -123,3 +123,50 @@ func RemovePlaylistEntry(db *sql.DB, entryID string) error {
 	_, err := db.Exec(`DELETE FROM playlist_entries WHERE id = ?`, entryID)
 	return err
 }
+
+// ReplacePlaylistSongs atomically replaces a playlist's entire song list
+// with songIDs, in order.
+func ReplacePlaylistSongs(db *sql.DB, playlistID string, songIDs []string) error {
+	tx, err := db.Begin()
+	if err != nil {
+		return err
+	}
+	defer tx.Rollback()
+	if _, err := tx.Exec(`DELETE FROM playlist_entries WHERE playlist_id = ?`, playlistID); err != nil {
+		return err
+	}
+	for i, songID := range songIDs {
+		if _, err := tx.Exec(`INSERT INTO playlist_entries (id, playlist_id, song_id, position) VALUES (?, ?, ?, ?)`,
+			idgen.New("pe"), playlistID, songID, i); err != nil {
+			return err
+		}
+	}
+	if _, err := tx.Exec(`UPDATE playlists SET updated_at = strftime('%Y-%m-%dT%H:%M:%fZ','now') WHERE id = ?`, playlistID); err != nil {
+		return err
+	}
+	return tx.Commit()
+}
+
+// ListPlaylistsByOwner returns only playlists owned by userID (used when
+// an admin requests another user's playlists by username).
+func ListPlaylistsByOwner(db *sql.DB, ownerID string) ([]*Playlist, error) {
+	rows, err := db.Query(playlistSelect+` WHERE owner_id = ? ORDER BY name COLLATE NOCASE`, ownerID)
+	if err != nil {
+		return nil, err
+	}
+	defer rows.Close()
+	var out []*Playlist
+	for rows.Next() {
+		var p Playlist
+		var isPublic int
+		var createdAt, updatedAt string
+		if err := rows.Scan(&p.ID, &p.OwnerID, &p.Name, &p.Description, &isPublic, &createdAt, &updatedAt); err != nil {
+			return nil, err
+		}
+		p.IsPublic = isPublic != 0
+		p.CreatedAt, _ = parseTime(createdAt)
+		p.UpdatedAt, _ = parseTime(updatedAt)
+		out = append(out, &p)
+	}
+	return out, rows.Err()
+}