Added utility to work with urls

utils/url.go

@@ -0,0 +1,82 @@
+package utils
+
+import (
+	"fmt"
+	"github.com/ByteDream/crunchyroll-go"
+)
+
+// ExtractEpisodesFromUrl extracts all episodes from an url.
+// If audio is not empty, the episodes gets filtered after the given locale
+func ExtractEpisodesFromUrl(crunchy *crunchyroll.Crunchyroll, url string, audio crunchyroll.LOCALE) ([]*crunchyroll.Episode, error) {
+	series, episodes, err := ParseUrl(crunchy, url)
+	if err != nil {
+		return nil, err
+	}
+
+	var eps []*crunchyroll.Episode
+
+	if series != nil {
+		seasons, err := series.Seasons()
+		if err != nil {
+			return nil, err
+		}
+		for _, season := range seasons {
+			if audio != "" {
+				if audioLocale, err := season.AudioLocale(); err != nil {
+					return nil, err
+				} else if audioLocale != audio {
+					continue
+				}
+			}
+			e, err := season.Episodes()
+			if err != nil {
+				return nil, err
+			}
+			eps = append(eps, e...)
+		}
+	} else if episodes != nil {
+		for _, episode := range episodes {
+			if audio == "" {
+				eps = append(eps, episode)
+			} else if audioLocale, err := episode.AudioLocale(); err != nil {
+				return nil, err
+			} else if audioLocale == audio {
+				eps = append(eps, episode)
+			}
+		}
+	}
+
+	return eps, nil
+}
+
+// ParseUrl parses the given url into a series or episode.
+// The returning episode is a slice because non-beta urls have the same episode with different languages
+func ParseUrl(crunchy *crunchyroll.Crunchyroll, url string) (*crunchyroll.Series, []*crunchyroll.Episode, error) {
+	if seriesId, ok := crunchyroll.ParseBetaSeriesURL(url); ok {
+		series, err := crunchyroll.SeriesFromID(crunchy, seriesId)
+		if err != nil {
+			return nil, nil, err
+		}
+		return series, nil, nil
+	} else if episodeId, ok := crunchyroll.ParseBetaEpisodeURL(url); ok {
+		episode, err := crunchyroll.EpisodeFromID(crunchy, episodeId)
+		if err != nil {
+			return nil, nil, err
+		}
+		return nil, []*crunchyroll.Episode{episode}, nil
+	} else if seriesName, ok := crunchyroll.ParseVideoURL(url); ok {
+		video, err := crunchy.FindVideoByName(seriesName)
+		if err != nil {
+			return nil, nil, err
+		}
+		return video.(*crunchyroll.Series), nil, nil
+	} else if seriesName, title, _, _, ok := crunchyroll.ParseEpisodeURL(url); ok {
+		episodes, err := crunchy.FindEpisodeByName(seriesName, title)
+		if err != nil {
+			return nil, nil, err
+		}
+		return nil, episodes, nil
+	} else {
+		return nil, nil, fmt.Errorf("invalid url %s", url)
+	}
+}