Python crawler---Autohome font anti-crawling

##This article brings you the content about Python crawler---Autohome font reverse crawling has certain reference value. Friends in need can refer to it. I hope it will be helpful to you.

Target website: Autohome

Target website: https://club.autohome.com.cn/bbs/thread/2d8a42404ba24266/77486027-1.html#pvareaid=2199101

Reason:

Today my old colleague asked me to look at a website: "Auto Home". At first I looked at it and felt that there should be no anti-crawling measures, but during the actual operation, I found that it turned out to be a font Anti-crawling encryption is performed.

View source code:

Can’t help but be surprised, is it UTF-8 encoded text? So I converted online,

#After converting, I still found that the font I got was still a fake font. Not believing in evil, I pasted the article into NotePad again and found:

It turns out that these fonts cannot be pasted. Well, we can only consider that the font settings are anti-crawling. I saw

 in the source code, so I looked through myfont to see if I could find anything? As a result, I really found something

Isn’t this a ..ttf font? Is it encrypted using this font? Then download this font first to see if the guess is correct. After downloading the font, here is a tool for viewing ttf fonts: Font Creator (download by yourself...) Download and open to view

Each character above shows its glyph and its glyph code, so I can’t help but think about it, how to convert these two fonts? Looking through many big blogs, I found a python package that specializes in analyzing fonts, fonttools. Install pip install fonttools by yourself. Reference link: https://darknode.in/font/font-tools-guide/

# 那么便开始通过字体库进行解析
world = TTFont('./world.ttf')
# 读取响应的映射关系
uni_list = world['cmap'].tables[0].ttFont.getGlyphOrder()  # 'cmap' 表示汉字对应的映射 为unicode编码
print(uni_list) # 按顺序拿到各个字符的unicode编码
# 打印结果：
['.notdef', 'uniEDE8', 'uniED35', 'uniED87', 'uniECD3', 'uniED25', 'uniEC72', 'uniEDB2', 'uniEE04', 'uniED51', 'uniEC9D', 'uniECEF', 'uniEC3C', 'uniEC8D', 'uniEDCE', 'uniED1B', 'uniED6C', 'uniECB9', 'uniEDFA', 'uniEC57', 'uniED98', 'uniEDEA', 'uniED36', 'uniEC83', 'uniECD5', 'uniEC21', 'uniED62', 'uniEDB4', 'uniED00', 'uniED52', 'uniEC9F', 'uniEDDF', 'uniEC3D', 'uniED7E', 'uniECCA', 'uniED1C', 'uniEC69', 'uniECBB', 'uniEDFB']
# .notdef 并不是汉字的映射， 而是表示字体家族名称。
将映射列表转换成unicode的类型，因为自己文中获取的是字符串unicode类型的，当然你也可以转化为utf-8,不过你获取的文章内容也要转化为utf-8
unicode_list= [eval(r"u'\u" + uni[3:] + "'") for uni in uni_list[1:]]

Regarding mapping, I actually have some doubts about what is between utf-8 and unicode. relation? It is recommended to refer to Zhihu for detailed explanation:

https://www.zhihu.com/question/23374078

Okay, everything has been prepared above. Let’s write some code.

# coding:utf-8
import re
import requests
from scrapy import Selector
from fontTools.ttLib import TTFont
class QiCheZhiJiaSpider:
    def article_content(self):
        url = 'https://club.autohome.com.cn/bbs/thread/2d8a42404ba24266/77486027-1.html#pvareaid=2199101'
        headers = {
            'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; WOW64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/64.0.3282.119 Safari/537.36'
        }
        try:
            response = requests.get(url=url, headers=headers).text
            response_info = Selector(text=response)
        except BaseException as e:
            print(e)
        else:
            content = response_info.xpath('//div[@class="tz-paragraph"]//text()').extract()  # 获取列表的形式内容。
            # print(content)
            content_str = ''.join(content)
            # 紧接着获取字体的链接
            world_href = re.findall(r",url\('(//.*\.ttf)'\).*", response, re.M or re.S)[0]
            world_href = 'https:' + world_href
            world_content = requests.get(url=world_href, headers=headers).content
            # 对获取到的字体进行下载..........
            with open('./world.ttf', 'wb') as f:
                f.write(world_content)
            # 那么便开始通过字体库进行解析
            world = TTFont('./world.ttf')
            # 读取响应的映射关系
            uni_list = world['cmap'].tables[0].ttFont.getGlyphOrder()
            unicode_list = [eval(r"u'\u" + uni[3:] + "'") for uni in uni_list[1:]]
            world_list = ["右", "远", "高", "呢", "了", "短", "得", "矮", "多", "二", "大", "一", "不", "近",
                          "是", "着", "五", "三", "九", "六", "少", "好", "上", "七", "和", "很", "十",
                          "四", "左", "下", "八", "小", "坏", "低", "长", "更", "的", "地"]  # # 录入字体文件中的字符。必须要以国际标准的unicode编码
            for i in range(len(unicode_list )):
                content_str = content_str.replace(unicode_list [i], world_list[i])
            print(content_str)
if __name__ == '__main__':
    qi_che_zhi_jia = QiCheZhiJiaSpider()
    qi_che_zhi_jia.article_content()

Result display:

The above is all the introduction, I hope everyone can gain something, more

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