Move all Spotify and LastFM code into only one folder for each

core/agents/lastfm/lastfm.go

@@ -0,0 +1,164 @@
+package lastfm
+
+import (
+	"context"
+	"net/http"
+
+	"github.com/navidrome/navidrome/conf"
+	"github.com/navidrome/navidrome/consts"
+	"github.com/navidrome/navidrome/core/agents"
+	"github.com/navidrome/navidrome/log"
+	"github.com/navidrome/navidrome/utils"
+)
+
+const (
+	lastFMAgentName = "lastfm"
+	lastFMAPIKey    = "c2918986bf01b6ba353c0bc1bdd27bea"
+	//lastFMAPISecret = "3ff2aa214a6d8f2242515083bbb70e79" // Will be needed when implementing Scrobbling
+)
+
+type lastfmAgent struct {
+	ctx    context.Context
+	apiKey string
+	lang   string
+	client *Client
+}
+
+func lastFMConstructor(ctx context.Context) agents.Interface {
+	l := &lastfmAgent{
+		ctx:  ctx,
+		lang: conf.Server.LastFM.Language,
+	}
+	if conf.Server.LastFM.ApiKey != "" {
+		l.apiKey = conf.Server.LastFM.ApiKey
+	} else {
+		l.apiKey = lastFMAPIKey
+	}
+	hc := utils.NewCachedHTTPClient(http.DefaultClient, consts.DefaultCachedHttpClientTTL)
+	l.client = NewClient(l.apiKey, l.lang, hc)
+	return l
+}
+
+func (l *lastfmAgent) AgentName() string {
+	return lastFMAgentName
+}
+
+func (l *lastfmAgent) GetMBID(id string, name string) (string, error) {
+	a, err := l.callArtistGetInfo(name, "")
+	if err != nil {
+		return "", err
+	}
+	if a.MBID == "" {
+		return "", agents.ErrNotFound
+	}
+	return a.MBID, nil
+}
+
+func (l *lastfmAgent) GetURL(id, name, mbid string) (string, error) {
+	a, err := l.callArtistGetInfo(name, mbid)
+	if err != nil {
+		return "", err
+	}
+	if a.URL == "" {
+		return "", agents.ErrNotFound
+	}
+	return a.URL, nil
+}
+
+func (l *lastfmAgent) GetBiography(id, name, mbid string) (string, error) {
+	a, err := l.callArtistGetInfo(name, mbid)
+	if err != nil {
+		return "", err
+	}
+	if a.Bio.Summary == "" {
+		return "", agents.ErrNotFound
+	}
+	return a.Bio.Summary, nil
+}
+
+func (l *lastfmAgent) GetSimilar(id, name, mbid string, limit int) ([]agents.Artist, error) {
+	resp, err := l.callArtistGetSimilar(name, mbid, limit)
+	if err != nil {
+		return nil, err
+	}
+	if len(resp) == 0 {
+		return nil, agents.ErrNotFound
+	}
+	var res []agents.Artist
+	for _, a := range resp {
+		res = append(res, agents.Artist{
+			Name: a.Name,
+			MBID: a.MBID,
+		})
+	}
+	return res, nil
+}
+
+func (l *lastfmAgent) GetTopSongs(id, artistName, mbid string, count int) ([]agents.Song, error) {
+	resp, err := l.callArtistGetTopTracks(artistName, mbid, count)
+	if err != nil {
+		return nil, err
+	}
+	if len(resp) == 0 {
+		return nil, agents.ErrNotFound
+	}
+	var res []agents.Song
+	for _, t := range resp {
+		res = append(res, agents.Song{
+			Name: t.Name,
+			MBID: t.MBID,
+		})
+	}
+	return res, nil
+}
+
+func (l *lastfmAgent) callArtistGetInfo(name string, mbid string) (*Artist, error) {
+	a, err := l.client.ArtistGetInfo(l.ctx, name, mbid)
+	lfErr, isLastFMError := err.(*lastFMError)
+	if mbid != "" && ((err == nil && a.Name == "[unknown]") || (isLastFMError && lfErr.Code == 6)) {
+		log.Warn(l.ctx, "LastFM/artist.getInfo could not find artist by mbid, trying again", "artist", name, "mbid", mbid)
+		return l.callArtistGetInfo(name, "")
+	}
+
+	if err != nil {
+		log.Error(l.ctx, "Error calling LastFM/artist.getInfo", "artist", name, "mbid", mbid, err)
+		return nil, err
+	}
+	return a, nil
+}
+
+func (l *lastfmAgent) callArtistGetSimilar(name string, mbid string, limit int) ([]Artist, error) {
+	s, err := l.client.ArtistGetSimilar(l.ctx, name, mbid, limit)
+	lfErr, isLastFMError := err.(*lastFMError)
+	if mbid != "" && ((err == nil && s.Attr.Artist == "[unknown]") || (isLastFMError && lfErr.Code == 6)) {
+		log.Warn(l.ctx, "LastFM/artist.getSimilar could not find artist by mbid, trying again", "artist", name, "mbid", mbid)
+		return l.callArtistGetSimilar(name, "", limit)
+	}
+	if err != nil {
+		log.Error(l.ctx, "Error calling LastFM/artist.getSimilar", "artist", name, "mbid", mbid, err)
+		return nil, err
+	}
+	return s.Artists, nil
+}
+
+func (l *lastfmAgent) callArtistGetTopTracks(artistName, mbid string, count int) ([]Track, error) {
+	t, err := l.client.ArtistGetTopTracks(l.ctx, artistName, mbid, count)
+	lfErr, isLastFMError := err.(*lastFMError)
+	if mbid != "" && ((err == nil && t.Attr.Artist == "[unknown]") || (isLastFMError && lfErr.Code == 6)) {
+		log.Warn(l.ctx, "LastFM/artist.getTopTracks could not find artist by mbid, trying again", "artist", artistName, "mbid", mbid)
+		return l.callArtistGetTopTracks(artistName, "", count)
+	}
+	if err != nil {
+		log.Error(l.ctx, "Error calling LastFM/artist.getTopTracks", "artist", artistName, "mbid", mbid, err)
+		return nil, err
+	}
+	return t.Track, nil
+}
+
+func init() {
+	conf.AddHook(func() {
+		if conf.Server.LastFM.Enabled {
+			agents.Register(lastFMAgentName, lastFMConstructor)
+		}
+	})
+}