backend_shared.py 文件源码

def extract_video_id(url):
    """ Extract the video id from a url, return video id as str. """
    idregx = re.compile(r'[\w-]{11}$')
    url = str(url)

    if idregx.match(url):
        return url # ID of video

    if '://' not in url:
        url = '//' + url
    parsedurl = urlparse(url)
    if parsedurl.netloc in ('youtube.com', 'www.youtube.com', 'm.youtube.com', 'gaming.youtube.com'):
        query = parse_qs(parsedurl.query)
        if 'v' in query and idregx.match(query['v'][0]):
            return query['v'][0]
    elif parsedurl.netloc in ('youtu.be', 'www.youtu.be'):
        vidid = parsedurl.path.split('/')[-1] if parsedurl.path else ''
        if idregx.match(vidid):
            return vidid

    err = "Need 11 character video id or the URL of the video. Got %s"
    raise ValueError(err % url)