requests_toolbelt.downloadutils can not parse encoded file name in response header

[liang2307]

response headers like this:

Content-Disposition:attachment;filename*=charset'lang'value

In my script, temporarily use the custom method to hook function stream._get_filename.

from requests_toolbelt.downloadutils import stream
def _get_filename(content_disposition):

    _QUOTED_STRING_RE = r'"[^"\\]*(?:\\.[^"\\]*)*"'
    _OPTION_HEADER_PIECE_RE = re.compile(
        r';\s*(%s|[^\s;=]+)\s*(?:=\s*(%s|[^;]+))?\s*' % (_QUOTED_STRING_RE,
                                                         _QUOTED_STRING_RE)
    )
    for match in _OPTION_HEADER_PIECE_RE.finditer(content_disposition):
        k, v = match.groups()
        if k == 'filename':
            # ignore any directory paths in the filename
            return os.path.split(v)[1]
        if k == 'filename*':
            return unquote(v).split('\'\'')[1]
    return None
stream._get_filename = _get_filename

Expect to fix this issue