Add ExternalInformation core service (not a great name, I know)

core/wire_providers.go

@@ -1,6 +1,11 @@
 package core
 
 import (
+	"net/http"
+
+	"github.com/deluan/navidrome/conf"
+	"github.com/deluan/navidrome/core/lastfm"
+	"github.com/deluan/navidrome/core/spotify"
 	"github.com/deluan/navidrome/core/transcoder"
 	"github.com/google/wire"
 )
@@ -11,5 +16,24 @@ var Set = wire.NewSet(
 	NewTranscodingCache,
 	NewImageCache,
 	NewArchiver,
+	NewExternalInfo,
+	LastFMNewClient,
+	SpotifyNewClient,
 	transcoder.New,
 )
+
+func LastFMNewClient() LastFMClient {
+	if conf.Server.LastFM.ApiKey == "" {
+		return nil
+	}
+
+	return lastfm.NewClient(conf.Server.LastFM.ApiKey, conf.Server.LastFM.Language, http.DefaultClient)
+}
+
+func SpotifyNewClient() SpotifyClient {
+	if conf.Server.Spotify.ID == "" || conf.Server.Spotify.Secret == "" {
+		return nil
+	}
+
+	return spotify.NewClient(conf.Server.Spotify.ID, conf.Server.Spotify.Secret, http.DefaultClient)
+}