feat(server): add option Lastfm.ScrobbleFirstArtistOnly to send only the first artist (#4131)

fixes #3791

Signed-off-by: Deluan <deluan@navidrome.org>

conf/configuration.go

@@ -158,6 +158,7 @@ type lastfmOptions struct {
 	ApiKey                  string
 	Secret                  string
 	Language                string
+	ScrobbleFirstArtistOnly bool
 }
 
 type spotifyOptions struct {
@@ -528,6 +529,7 @@ func setViperDefaults() {
 	viper.SetDefault("lastfm.language", "en")
 	viper.SetDefault("lastfm.apikey", "")
 	viper.SetDefault("lastfm.secret", "")
+	viper.SetDefault("lastfm.scrobblefirstartistonly", false)
 	viper.SetDefault("spotify.id", "")
 	viper.SetDefault("spotify.secret", "")
 	viper.SetDefault("listenbrainz.enabled", true)

core/agents/lastfm/agent.go

@@ -279,6 +279,13 @@ func (l *lastfmAgent) callArtistGetTopTracks(ctx context.Context, artistName str
 	return t.Track, nil
 }
 
+func (l *lastfmAgent) getArtistForScrobble(track *model.MediaFile) string {
+	if conf.Server.LastFM.ScrobbleFirstArtistOnly && len(track.Participants[model.RoleArtist]) > 0 {
+		return track.Participants[model.RoleArtist][0].Name
+	}
+	return track.Artist
+}
+
 func (l *lastfmAgent) NowPlaying(ctx context.Context, userId string, track *model.MediaFile) error {
 	sk, err := l.sessionKeys.Get(ctx, userId)
 	if err != nil || sk == "" {
@@ -286,7 +293,7 @@ func (l *lastfmAgent) NowPlaying(ctx context.Context, userId string, track *mode
 	}
 
 	err = l.client.updateNowPlaying(ctx, sk, ScrobbleInfo{
-		artist:      track.Artist,
+		artist:      l.getArtistForScrobble(track),
 		track:       track.Title,
 		album:       track.Album,
 		trackNumber: track.TrackNumber,
@@ -312,7 +319,7 @@ func (l *lastfmAgent) Scrobble(ctx context.Context, userId string, s scrobbler.S
 		return nil
 	}
 	err = l.client.scrobble(ctx, sk, ScrobbleInfo{
-		artist:      s.Artist,
+		artist:      l.getArtistForScrobble(&s.MediaFile),
 		track:       s.Title,
 		album:       s.Album,
 		trackNumber: s.TrackNumber,

core/agents/lastfm/agent_test.go

@@ -196,6 +196,12 @@ var _ = Describe("lastfmAgent", func() {
 				TrackNumber:    1,
 				Duration:       180,
 				MbzRecordingID: "mbz-123",
+				Participants: map[model.Role]model.ParticipantList{
+					model.RoleArtist: []model.Participant{
+						{Artist: model.Artist{ID: "ar-1", Name: "First Artist"}},
+						{Artist: model.Artist{ID: "ar-2", Name: "Second Artist"}},
+					},
+				},
 			}
 		})
 
@@ -247,6 +253,23 @@ var _ = Describe("lastfmAgent", func() {
 				Expect(sentParams.Get("timestamp")).To(Equal(strconv.FormatInt(ts.Unix(), 10)))
 			})
 
+			When("ScrobbleFirstArtistOnly is true", func() {
+				BeforeEach(func() {
+					conf.Server.LastFM.ScrobbleFirstArtistOnly = true
+				})
+
+				It("uses only the first artist", func() {
+					ts := time.Now()
+					httpClient.Res = http.Response{Body: io.NopCloser(bytes.NewBufferString("{}")), StatusCode: 200}
+
+					err := agent.Scrobble(ctx, "user-1", scrobbler.Scrobble{MediaFile: *track, TimeStamp: ts})
+
+					Expect(err).ToNot(HaveOccurred())
+					sentParams := httpClient.SavedRequest.URL.Query()
+					Expect(sentParams.Get("artist")).To(Equal("First Artist"))
+				})
+			})
+
 			It("skips songs with less than 31 seconds", func() {
 				track.Duration = 29
 				httpClient.Res = http.Response{Body: io.NopCloser(bytes.NewBufferString("{}")), StatusCode: 200}