feat(subsonic): implement getSimilarSongs.view

closes #195

server/scrobble/lastfm/lastfm.go

@@ -31,6 +31,7 @@ type LastFM struct {
 	Error          Error          `xml:"error"`
 	Artist         Artist         `xml:"artist"`
 	TopTracks      TopTracks      `xml:"toptracks"`
+	SimilarTracks  SimilarTracks  `xml:"similartracks"`
 }
 
 type Session struct {
@@ -84,6 +85,13 @@ type TopTracks struct {
 	Tracks  []Track  `xml:"track"`
 }
 
+type SimilarTracks struct {
+	XMLName xml.Name `xml:"similartracks"`
+	Artist  string   `xml:"artist,attr"`
+	Track   string   `xml:"track,attr"`
+	Tracks  []Track  `xml:"track"`
+}
+
 type Track struct {
 	Rank      int     `xml:"rank,attr"`
 	Tracks    []Track `xml:"track"`
@@ -158,6 +166,18 @@ func ArtistGetTopTracks(apiKey, artistName string) (TopTracks, error) {
 	return resp.TopTracks, nil
 }
 
+func TrackGetSimilarTracks(apiKey string, artistName, trackName string) (SimilarTracks, error) {
+	params := url.Values{}
+	params.Add("method", "track.getSimilar")
+	params.Add("api_key", apiKey)
+	params.Add("track", trackName)
+	params.Add("artist", artistName)
+	resp, err := makeRequest("GET", params)
+	if err != nil {
+		return SimilarTracks{}, fmt.Errorf("making track GET: %w", err)
+	}
+	return resp.SimilarTracks, nil
+}
 func GetSession(apiKey, secret, token string) (string, error) {
 	params := url.Values{}
 	params.Add("method", "auth.getSession")