import hashlib
import re
import time
from urllib import parse

from common.query import Query


class NetCraft(Query):
    def __init__(self, domain):
        Query.__init__(self)
        self.domain = domain
        self.module = 'Dataset'
        self.source = 'NetCraftQuery'
        self.addr = 'https://searchdns.netcraft.com/?restriction=site+contains&position=limited'
        self.page_num = 1
        self.per_page_num = 20

    def query(self):
        """
        向接口查询子域并做子域匹配
        """
        self.header = self.get_header()  # NetCraft会检查User-Agent
        self.proxy = self.get_proxy(self.source)
        last = ''
        while True:
            time.sleep(self.delay)
            self.proxy = self.get_proxy(self.source)
            params = {'host': '*.' + self.domain,
                      'from': self.page_num}
            resp = self.get(self.addr + last, params)
            subdomains = self.match_subdomains(resp)
            if not subdomains:  # 搜索没有发现子域名则停止搜索
                break
            self.subdomains.update(subdomains)
            if 'Next Page' not in resp.text:  # 搜索页面没有出现下一页时停止搜索
                break
            last = re.search(r'&last=.*' + self.domain, resp.text).group(0)
            self.page_num += self.per_page_num
            if self.page_num > 500:
                break

    def run(self):
        """
        类执行入口
        """
        self.begin()
        self.query()
        self.finish()
        self.save_json()
        self.gen_result()
        self.save_db()


def run(domain):
    """
    类统一调用入口

    :param str domain: 域名
    """
    query = NetCraft(domain)
    query.run()


if __name__ == '__main__':
    run('example.com')