added audio url to datatype

internal/data/source.go

@@ -19,7 +19,9 @@ const AlbumSource = ObjectType("album")
 const ArtistSource = ObjectType("artist")
 
 type Source struct {
-	Url        string
+	Url      string
+	AudioUrl string // will only be used when ObjectType = SongSource
+
 	SourceType *SourceType
 	ObjectType ObjectType
 }
@@ -38,6 +40,9 @@ func dedupeSources(inputSources []Source) []Source {
 			if source.SourceType != nil {
 				deduped[mergeWithIndex].SourceType = source.SourceType
 			}
+			if source.AudioUrl != "" {
+				deduped[mergeWithIndex].AudioUrl = source.AudioUrl
+			}
 
 		} else {
 			// just appending