code: def guess_file_type(kind, filepath=None, youtube_id=None, web_url=None, encoding=None):
      
      if youtube_id:
          return FileTypes.YOUTUBE_VIDEO_FILE
      elif web_url:
          return FileTypes.WEB_VIDEO_FILE
      elif encoding:
          return FileTypes.BASE64_FILE
      else:
          ext = os.path.splitext(filepath)[1][1:].lower()
          if kind in FILE_TYPE_MAPPING and ext in FILE_TYPE_MAPPING[kind]:
              return FILE_TYPE_MAPPING[kind][ext]
      return None
docs: guess_file_class: determines what file the content is
          Args:
              filepath (str): filepath of file to check
          Returns: string indicating file's class