refactor: migrate to gotd (wip)

common/utils.go

@@ -0,0 +1,35 @@
+package common
+
+import (
+	"fmt"
+
+	"github.com/gotd/td/tg"
+	"github.com/krau/SaveAny-Bot/logger"
+	"github.com/krau/SaveAny-Bot/types"
+)
+
+func FileFromMedia(media tg.MessageMediaClass) (*types.File, error) {
+	logger.L.Debug("FileFromMedia")
+	switch media := media.(type) {
+	case *tg.MessageMediaDocument:
+		document, ok := media.Document.AsNotEmpty()
+		if !ok {
+			return nil, fmt.Errorf("unexpected type %T", media)
+		}
+		var fileName string
+		for _, attribute := range document.Attributes {
+			if name, ok := attribute.(*tg.DocumentAttributeFilename); ok {
+				fileName = name.FileName
+				break
+			}
+		}
+		return &types.File{
+			Location: document.AsInputDocumentFileLocation(),
+			FileSize: document.Size,
+			FileName: fileName,
+			MimeType: document.MimeType,
+			ID:       document.ID,
+		}, nil
+	}
+	return nil, fmt.Errorf("unexpected type %T", media)
+}