net.py 文件源码

def valid_url(self, value):
        match = self.URL_REGEX.match(value)
        if not match:
            return False
        url = match.groupdict()

        if url['scheme'].lower() not in self.schemes:
            return False
        if url['host6']:
            if IPv6Type.valid_ip(url['host6']):
                return url
            else:
                return False
        if url['host4']:
            return url

        try:
            hostname = url['hostn'].encode('ascii').decode('ascii')
        except UnicodeError:
            try:
                hostname = url['hostn'].encode('idna').decode('ascii')
            except UnicodeError:
                return False

        if hostname[-1] == '.':
            hostname = hostname[:-1]
        if len(hostname) > 253:
            return False

        labels = hostname.split('.')
        for label in labels:
            if not 0 < len(label) < 64:
                return False
            if '-' in (label[0], label[-1]):
                return False
        if self.fqdn:
            if len(labels) == 1 \
              or not self.TLD_REGEX.match(labels[-1]):
                return False

        url['hostn_enc'] = hostname

        return url