implemented proper fetching and matching the source

internal/data/source.go

@@ -1,13 +1,15 @@
 package data
 
 import (
-	"errors"
 	"regexp"
 )
 
 type SourceType struct {
-	Name  string
-	Regex *regexp.Regexp
+	Name        string
+	Regex       *regexp.Regexp
+	RegexArtist *regexp.Regexp
+	RegexAlbum  *regexp.Regexp
+	RegexSong   *regexp.Regexp
 }
 
 var SourceTypes = []SourceType{
@@ -24,39 +26,14 @@ func GetSourceType(name string) *SourceType {
 	panic("couldn't find source type for " + name)
 }
 
+type ObjectType string
+
+const SongSource = ObjectType("song")
+const AlbumSource = ObjectType("album")
+const ArtistSource = ObjectType("artist")
+
 type Source struct {
-	Url  string
-	Type *SourceType
-}
-
-func (st *SourceType) NewSource(url string) (Source, error) {
-	var err error = nil
-	if !st.Regex.MatchString(url) {
-		err = errors.New("url " + url + " didn't match source " + st.Name)
-	}
-
-	return Source{
-		Url:  url,
-		Type: st,
-	}, err
-}
-
-func NewSource(url string) (Source, error) {
-	var st *SourceType = nil
-
-	for i, source := range SourceTypes {
-		if source.Regex.MatchString(url) {
-			st = &SourceTypes[i]
-			break
-		}
-	}
-
-	if st == nil {
-		return Source{}, errors.New("couldn't find a source type for the url " + url)
-	}
-
-	return Source{
-		Url:  url,
-		Type: st,
-	}, nil
+	Url        string
+	SourceType *SourceType
+	ObjectType ObjectType
 }