Import smart playlists (extension .nsp)

core/playlists.go

@@ -0,0 +1,186 @@
+package core
+
+import (
+	"bufio"
+	"bytes"
+	"context"
+	"encoding/json"
+	"fmt"
+	"io"
+	"net/url"
+	"os"
+	"path/filepath"
+	"strings"
+
+	"github.com/navidrome/navidrome/log"
+	"github.com/navidrome/navidrome/model"
+	"github.com/navidrome/navidrome/model/request"
+)
+
+type Playlists interface {
+	ImportFile(ctx context.Context, dir string, fname string) (*model.Playlist, error)
+}
+
+type playlists struct {
+	ds model.DataStore
+}
+
+func NewPlaylists(ds model.DataStore) Playlists {
+	return &playlists{ds: ds}
+}
+
+func IsPlaylist(filePath string) bool {
+	extension := strings.ToLower(filepath.Ext(filePath))
+	return extension == ".m3u" || extension == ".m3u8" || extension == ".nsp"
+}
+
+func (s *playlists) ImportFile(ctx context.Context, dir string, fname string) (*model.Playlist, error) {
+	pls, err := s.parsePlaylist(ctx, fname, dir)
+	if err != nil {
+		log.Error(ctx, "Error parsing playlist", "playlist", fname, err)
+		return nil, err
+	}
+	log.Debug("Found playlist", "name", pls.Name, "lastUpdated", pls.UpdatedAt, "path", pls.Path, "numTracks", len(pls.Tracks))
+	err = s.updatePlaylist(ctx, pls)
+	if err != nil {
+		log.Error(ctx, "Error updating playlist", "playlist", fname, err)
+	}
+	return pls, err
+}
+
+func (s *playlists) parsePlaylist(ctx context.Context, playlistFile string, baseDir string) (*model.Playlist, error) {
+	pls, err := s.newSyncedPlaylist(baseDir, playlistFile)
+	if err != nil {
+		return nil, err
+	}
+
+	file, err := os.Open(pls.Path)
+	if err != nil {
+		return nil, err
+	}
+	defer file.Close()
+
+	extension := strings.ToLower(filepath.Ext(playlistFile))
+	switch extension {
+	case ".nsp":
+		return s.parseNSP(ctx, pls, file)
+	default:
+		return s.parseM3U(ctx, pls, baseDir, file)
+	}
+}
+
+func (s *playlists) newSyncedPlaylist(baseDir string, playlistFile string) (*model.Playlist, error) {
+	playlistPath := filepath.Join(baseDir, playlistFile)
+	info, err := os.Stat(playlistPath)
+	if err != nil {
+		return nil, err
+	}
+
+	var extension = filepath.Ext(playlistFile)
+	var name = playlistFile[0 : len(playlistFile)-len(extension)]
+
+	pls := &model.Playlist{
+		Name:      name,
+		Comment:   fmt.Sprintf("Auto-imported from '%s'", playlistFile),
+		Public:    false,
+		Path:      playlistPath,
+		Sync:      true,
+		UpdatedAt: info.ModTime(),
+	}
+	return pls, nil
+}
+
+func (s *playlists) parseNSP(ctx context.Context, pls *model.Playlist, file io.Reader) (*model.Playlist, error) {
+	content, err := io.ReadAll(file)
+	if err != nil {
+		return nil, err
+	}
+
+	pls.Rules = &model.SmartPlaylist{}
+	err = json.Unmarshal(content, pls.Rules)
+	if err != nil {
+		return nil, err
+	}
+	return pls, nil
+}
+
+func (s *playlists) parseM3U(ctx context.Context, pls *model.Playlist, baseDir string, file io.Reader) (*model.Playlist, error) {
+	mediaFileRepository := s.ds.MediaFile(ctx)
+	scanner := bufio.NewScanner(file)
+	scanner.Split(scanLines)
+	var mfs model.MediaFiles
+	for scanner.Scan() {
+		path := scanner.Text()
+		// Skip extended info
+		if strings.HasPrefix(path, "#") {
+			continue
+		}
+		if strings.HasPrefix(path, "file://") {
+			path = strings.TrimPrefix(path, "file://")
+			path, _ = url.QueryUnescape(path)
+		}
+		if !filepath.IsAbs(path) {
+			path = filepath.Join(baseDir, path)
+		}
+		mf, err := mediaFileRepository.FindByPath(path)
+		if err != nil {
+			log.Warn(ctx, "Path in playlist not found", "playlist", pls.Name, "path", path, err)
+			continue
+		}
+		mfs = append(mfs, *mf)
+	}
+	pls.Tracks = nil
+	pls.AddMediaFiles(mfs)
+
+	return pls, scanner.Err()
+}
+
+func (s *playlists) updatePlaylist(ctx context.Context, newPls *model.Playlist) error {
+	owner, _ := request.UsernameFrom(ctx)
+
+	pls, err := s.ds.Playlist(ctx).FindByPath(newPls.Path)
+	if err != nil && err != model.ErrNotFound {
+		return err
+	}
+	if err == nil && !pls.Sync {
+		log.Debug(ctx, "Playlist already imported and not synced", "playlist", pls.Name, "path", pls.Path)
+		return nil
+	}
+
+	if err == nil {
+		log.Info(ctx, "Updating synced playlist", "playlist", pls.Name, "path", newPls.Path)
+		newPls.ID = pls.ID
+		newPls.Name = pls.Name
+		newPls.Comment = pls.Comment
+		newPls.Owner = pls.Owner
+		newPls.Public = pls.Public
+	} else {
+		log.Info(ctx, "Adding synced playlist", "playlist", newPls.Name, "path", newPls.Path, "owner", owner)
+		newPls.Owner = owner
+	}
+	return s.ds.Playlist(ctx).Put(newPls)
+}
+
+// From https://stackoverflow.com/a/41433698
+func scanLines(data []byte, atEOF bool) (advance int, token []byte, err error) {
+	if atEOF && len(data) == 0 {
+		return 0, nil, nil
+	}
+	if i := bytes.IndexAny(data, "\r\n"); i >= 0 {
+		if data[i] == '\n' {
+			// We have a line terminated by single newline.
+			return i + 1, data[0:i], nil
+		}
+		advance = i + 1
+		if len(data) > i+1 && data[i+1] == '\n' {
+			advance += 1
+		}
+		return advance, data[0:i], nil
+	}
+	// If we're at EOF, we have a final, non-terminated line. Return it.
+	if atEOF {
+		return len(data), data, nil
+	}
+	// Request more data.
+	return 0, nil, nil
+}