add new youtubedl dependency

downloader/vendor/github.com/kkdai/youtube/v2/errors.go

@@ -0,0 +1,47 @@
+package youtube
+
+import (
+	"fmt"
+)
+
+const (
+	ErrCipherNotFound             = constError("cipher not found")
+	ErrSignatureTimestampNotFound = constError("signature timestamp not found")
+	ErrInvalidCharactersInVideoID = constError("invalid characters in video id")
+	ErrVideoIDMinLength           = constError("the video id must be at least 10 characters long")
+	ErrReadOnClosedResBody        = constError("http: read on closed response body")
+	ErrNotPlayableInEmbed         = constError("embedding of this video has been disabled")
+	ErrLoginRequired              = constError("login required to confirm your age")
+	ErrVideoPrivate               = constError("user restricted access to this video")
+	ErrInvalidPlaylist            = constError("no playlist detected or invalid playlist ID")
+)
+
+type constError string
+
+func (e constError) Error() string {
+	return string(e)
+}
+
+type ErrPlayabiltyStatus struct {
+	Status string
+	Reason string
+}
+
+func (err ErrPlayabiltyStatus) Error() string {
+	return fmt.Sprintf("cannot playback and download, status: %s, reason: %s", err.Status, err.Reason)
+}
+
+// ErrUnexpectedStatusCode is returned on unexpected HTTP status codes
+type ErrUnexpectedStatusCode int
+
+func (err ErrUnexpectedStatusCode) Error() string {
+	return fmt.Sprintf("unexpected status code: %d", err)
+}
+
+type ErrPlaylistStatus struct {
+	Reason string
+}
+
+func (err ErrPlaylistStatus) Error() string {
+	return fmt.Sprintf("could not load playlist: %s", err.Reason)
+}