如何授权域名

import dns.resolver

def add_cname_record(domain, subdomain, target):
    try:
        # 创建DNS解析器
        resolver = dns.resolver.Resolver()
        resolver.nameservers = ['8.8.8.8']  # 使用Google的DNS服务器

        # 添加CNAME记录
        cname_record = dns.resolver.CNAME(subdomain + '.' + domain, target)
        update = dns.update.Update(domain)
        update.add(cname_record)

        # 更新DNS记录
        response = resolver.query(domain, 'SOA')
        zone = dns.zone.from_xfr(dns.query.xfr(response[0].mname.to_text(), '8.8.8.8'))
        zone.replace_rdataset(zone.find_rdataset('', dns.rdatatype.SOA, dns.rdataclass.IN), 0, dns.rdataset.from_text(zone.rdclass, zone.rdtype, zone.ttl, zone.origin.to_text(omit_final_dot=True), zone.email, zone.serial, zone.refresh, zone.retry, zone.expire, zone.minimum))
        zone.to_file('/etc/bind/db.' + domain)

        print(f"CNAME记录 {subdomain}.{domain} -> {target} 添加成功")
    except dns.resolver.NXDOMAIN:
        print(f"域名 {domain} 不存在")
    except dns.resolver.NoAnswer:
        print(f"域名 {domain} 没有响应")
    except dns.resolver.Timeout:
        print(f"请求超时")

# 示例调用
add_cname_record('example.com', 'sub', 'authorizedomain.com')