python-css反爬之svg映射

柔光的暖阳◎ 2022-12-22 12:27 120阅读 0赞

目标网站:[http://www.porters.vip/confusion/food.html][http_www.porters.vip_confusion_food.html]

详细解析可查看: [https://blog.csdn.net/BigBoy\_Coder/article/details/104748253][https_blog.csdn.net_BigBoy_Coder_article_details_104748253]

import requests
    from parsel import Selector
    import re
    
    def getSvgMapping():
        svg_url = 'http://www.porters.vip/confusion/font/food.svg'
        css_url = 'http://www.porters.vip/confusion/css/food.css'
    
        svg_resp = requests.get(svg_url).text
        css_resp = requests.get(css_url).text
    
        svg_list = re.findall(r'<text x=".*?" y="(.*?)">(.*?)</text>', svg_resp)
        # print(svg_list)   # [('38', '154669136497975167479825383996313925720573'), ('83', '560862462805204755437571121437458524985017'), ('120', '671260781104096663000892328440489239185923'), ('164', '684431081139502796807382')]
        css_list = re.findall(r'\.(\w{6}) \{\s+background: -(.*?)px -(.*?)px;\s+\}',css_resp)
        # print(css_list)       # [('vhk08k', '274', '141'), ('vhk6zl', '7', '15'), ('vhk0ao', '133', '97'), ('vhk9or', '330', '141'), ('vhkfln', '428', '15'), ('vhkbvu', '386', '97'), ('vhk84t', '176', '141'), ('vhkvxd', '246', '141'), ('vhkqsc', '288', '141'), ('vhkjj4', '316', '141'), ('vhk0f1', '316', '97')]
        svg_dict = {i[0]: i[1] for i in svg_list}
        # print(svg_dict)       # {'38': '154669136497975167479825383996313925720573', '83': '560862462805204755437571121437458524985017', '120': '671260781104096663000892328440489239185923', '164': '684431081139502796807382'}
        css_dict = {i[0]:[i[1],i[2]] for i in css_list}
        # print(css_dict)       # {'vhk08k': ['274', '141'], 'vhk6zl': ['7', '15'], 'vhk0ao': ['133', '97'], 'vhk9or': ['330', '141'], 'vhkfln': ['428', '15'], 'vhkbvu': ['386', '97'], 'vhk84t': ['176', '141'], 'vhkvxd': ['246', '141'], 'vhkqsc': ['288', '141'], 'vhkjj4': ['316', '141'], 'vhk0f1': ['316', '97']}
        font_size = int(re.search(r'<style>.*?font-size:(\d+)px.*?</style>',svg_resp).group(1))   # 14
        num_dict = {}
        for i in css_dict.items():
            for j in svg_dict.keys():
                if int(i[1][1]) < int(j):
                    break
            # 偏移量
            offset = int(i[1][0]) //font_size
            # 看到的数值
            rel_num = svg_dict[j][offset:offset+1]
            num_dict[i[0]] = rel_num
        return num_dict
    
    def spider():
        url = 'http://www.porters.vip/confusion/food.html'
        resp = requests.get(url).text
        num_dict = getSvgMapping()
        # {
       {'vhk08k': '0', 'vhk6zl': '1', 'vhk0ao': '1', 'vhk9or': '2', 'vhkfln': '3', 'vhkbvu': '4', 'vhk84t': '5', 'vhkvxd': '6', 'vhkqsc': '7', 'vhkjj4': '8', 'vhk0f1': '9'}
        # 全文替换
        for i in num_dict.items():
            resp = resp.replace(f'<d class="{i[0]}"></d>', i[1])
        html = Selector(resp)
        col_details = html.xpath('//div[@class="col details"]')
        for i in col_details:
            title = i.xpath('./div[1]/text()').extract_first().strip()
            score = i.xpath('./div[2]/span[2]/text()').extract()
            score += i.xpath('./div[2]/span[3]/text()').extract()
            score += i.xpath('./div[2]/span[4]/span[1]/text()').extract()
            score += i.xpath('./div[2]/span[4]/span[2]/text()').extract()
            score += i.xpath('./div[2]/span[4]/span[3]/text()').extract()
            address = ''.join(i.xpath('./div[3]/span/text()').extract())
            characteristic = i.xpath('./div[4]/span/text()').extract_first()
            phonenum = ''.join(i.xpath('./div[5]//text()').extract())
            print(title, ' '.join(score),address, characteristic, phonenum)
            # 柳州螺蛳粉 100条评论 人均:12 口味:8.7 环境:7.4 服务:7.6 地址:中山大道浦西路28号商铺 特色：脆爽酸笋，热辣红油，香葱萝卜，吃完还想吃 电话：400-51771
    
    spider()

[http_www.porters.vip_confusion_food.html]: http://www.porters.vip/confusion/food.html
[https_blog.csdn.net_BigBoy_Coder_article_details_104748253]: https://blog.csdn.net/BigBoy_Coder/article/details/104748253