code: def file_in_confined_directories(filepath, confined_directories):
    
  
    # Do the arguments have the correct format?
    # Raise 'securesystemslib.exceptions.FormatError' if there is a mismatch.
    securesystemslib.formats.RELPATH_SCHEMA.check_match(filepath)
    securesystemslib.formats.RELPATHS_SCHEMA.check_match(confined_directories)
  
    for confined_directory in confined_directories:
      # The empty string (arbitrarily chosen) signifies the client is confined
      # to all directories and subdirectories.  No need to check 'filepath'.
      if confined_directory == '':
        return True
  
      # Normalized paths needed, to account for up-level references, etc.
      # TUF clients have the option of setting the list of directories in
      # 'confined_directories'.
      filepath = os.path.normpath(filepath)
      confined_directory = os.path.normpath(confined_directory)
  
      # A TUF client may restrict himself to specific directories on the
      # remote repository.  The list of paths in 'confined_path', not including
      # each path's subdirectories, are the only directories the client will
      # download targets from.
      if os.path.dirname(filepath) == confined_directory:
        return True
  
    return False
docs: <Purpose>
      Check if the directory containing 'filepath' is in the list/tuple of
      'confined_directories'.
  
    <Arguments>
      filepath:
        A string representing the path of a file.  The following example path
        strings are viewed as files and not directories: 'a/b/c', 'a/b/c.txt'.
  
      confined_directories:
        A list, or a tuple, of directory strings.
  
    <Exceptions>
     securesystemslib.exceptions.FormatError: On incorrect format of the input.
  
    <Return>
      Boolean.  True, if path is either the empty string
      or in 'confined_paths'; False, otherwise.