def _parse_line(line):
    """
    Convert one line from the extended log to dict.

    Args:
        line (str): Line which will be converted.

    Returns:
        dict: dict with ``timestamp``, ``command``, ``username`` and ``path`` \
              keys.

    Note:
        Typical line looks like this::

            /home/ftp/xex/asd bsd.dat, xex, STOR, 1398351777

        Filename may contain ``,`` character, so I am ``rsplitting`` the line
        from the end to the beginning.
    """
    line, timestamp = line.rsplit(",", 1)
    line, command = line.rsplit(",", 1)
    path, username = line.rsplit(",", 1)

    return {
        "timestamp": timestamp.strip(),
        "command": command.strip(),
        "username": username.strip(),
        "path": path,
    }