add playlist support

server/ctrladmin/playlist.go

@@ -0,0 +1,66 @@
+package ctrladmin
+
+import (
+	"bufio"
+	"fmt"
+	"mime/multipart"
+	"strings"
+
+	"github.com/jinzhu/gorm"
+	"github.com/pkg/errors"
+
+	"senan.xyz/g/gonic/model"
+)
+
+func playlistParseLine(c *Controller, playlistID int, path string) error {
+	if strings.HasPrefix(path, "#") || strings.TrimSpace(path) == "" {
+		return nil
+	}
+	track := &model.Track{}
+	query := c.DB.Raw(`
+		SELECT tracks.id FROM TRACKS
+		JOIN albums ON tracks.album_id = albums.id
+		WHERE (? || '/' || albums.left_path || albums.right_path || '/' || tracks.filename) = ?
+	`, c.MusicPath, path)
+	err := query.First(&track).Error
+	switch {
+	case gorm.IsRecordNotFoundError(err):
+		return fmt.Errorf("couldn't match track %q", path)
+	case err != nil:
+		return errors.Wrap(err, "while matching")
+	}
+	c.DB.Create(&model.PlaylistItem{
+		PlaylistID: playlistID,
+		TrackID:    track.ID,
+	})
+	return nil
+}
+
+func playlistParseUpload(c *Controller, userID int, header *multipart.FileHeader) ([]string, bool) {
+	file, err := header.Open()
+	if err != nil {
+		return []string{fmt.Sprintf("couldn't open file %q", header.Filename)}, false
+	}
+	playlistName := strings.TrimSuffix(header.Filename, ".m3u8")
+	if playlistName == "" {
+		return []string{fmt.Sprintf("invalid filename %q", header.Filename)}, false
+	}
+	playlist := &model.Playlist{}
+	c.DB.FirstOrCreate(playlist, model.Playlist{
+		Name:   playlistName,
+		UserID: userID,
+	})
+	c.DB.Delete(&model.PlaylistItem{}, "playlist_id = ?", playlist.ID)
+	var errors []string
+	scanner := bufio.NewScanner(file)
+	for scanner.Scan() {
+		path := scanner.Text()
+		if err := playlistParseLine(c, playlist.ID, path); err != nil {
+			errors = append(errors, err.Error())
+		}
+	}
+	if err := scanner.Err(); err != nil {
+		return []string{fmt.Sprintf("scanning line of playlist: %v", err)}, true
+	}
+	return errors, true
+}