Redirect to /meta after upload/shorten

internal/db/fileupload.go

@@ -9,6 +9,7 @@ import (
 	"net/url"
 	"os"
 	"path"
+	"path/filepath"
 
 	"github.com/google/uuid"
 	"github.com/pkg/errors"
@@ -214,3 +215,8 @@ func (fu *FileUpload) URL() *url.URL {
 	}
 	return urlParse
 }
+
+// Ext returns the extension of the file attached to this FileUpload.
+func (fu *FileUpload) Ext() string {
+	return filepath.Ext(fu.FileName)
+}