找商业网字体加密（TTFont方法）

news2024/11/9 18:56:10

网点地址：公司介绍-泰州名列新材料有限公司 (zhaosw.com)

问题如下：

在网站中看到的电话号码在页面源码中无法查看

破解步骤：

1.找到woff文件

查找字体的class属性，全文查找font-face-encrypted找到如下内容，可以看到css样式中存在一个url，且是base64加密的：

使用base64解密后，下载woff文件。代码如下：

import base64

woff_str = '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'
contents = base64.b64decode(woff_str)
open('font.woff', 'wb').write(contents)

2.使用TTFont将woff转换成xml文件

代码如下：

from fontTools.ttLib import TTFont,BytesIO

f = TTFont('font.woff')
f.saveXML('font.xml')

运行结果如下：

3.拿到xml中的数据存放到字典中

代码如下：

    # 获取xml文件根目录
    root_obj = ElementTree.parse('font.xml').getroot()
    # 定位到map节点
    base = root_obj.find('cmap').findall('cmap_format_4')[0].findall('map')
    # 这里主要是整个关系字典，将unicode方法和值对应起来
    dicts = {}

    for i in base:
        dicts[i.attrib['code'][2:]] = i.attrib['name']

上面代码的意思就是在xml文件中找到下图部分的内容，然后创建一个字典用来保存对应关系，例如：400b对应1。

4.使用字典替换页面源码对应的部分

由于woff文件是动态变化的，所以每次请求的时候都要重新下载并转换woff文件。

全程源码如下:

import base64
import re

import requests
from fontTools.ttLib import TTFont,BytesIO
from xml.etree import ElementTree

def download():
    headers = {
        "authority": "mlxcl.zhaosw.com",
        "accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7",
        "accept-language": "zh-CN,zh;q=0.9,en;q=0.8,en-GB;q=0.7,en-US;q=0.6",
        "cache-control": "no-cache",
        "pragma": "no-cache",
        "referer": "https://mlxcl.zhaosw.com/products",
        "sec-ch-ua": "\"Not_A Brand\";v=\"8\", \"Chromium\";v=\"120\", \"Microsoft Edge\";v=\"120\"",
        "sec-ch-ua-mobile": "?0",
        "sec-ch-ua-platform": "\"Windows\"",
        "sec-fetch-dest": "document",
        "sec-fetch-mode": "navigate",
        "sec-fetch-site": "same-origin",
        "sec-fetch-user": "?1",
        "upgrade-insecure-requests": "1",
        "user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/120.0.0.0 Safari/537.36 Edg/120.0.0.0"
    }
    # 请求网站
    url = "https://mlxcl.zhaosw.com/about"
    response = requests.get(url, headers=headers).text

    # 拿到字体的 base64 字符串
    woff_str = re.findall('url\(data:application/x-font-ttf;charset=utf-8;base64,(.*?)\)', response)[0]
    contents = base64.b64decode(woff_str)
    open('font.woff', 'wb').write(contents)

    return response

def transform():
    # 接着把字体文件转格式
    f = TTFont('font.woff')
    f.saveXML('font.xml')

    # 获取xml文件根目录
    root_obj = ElementTree.parse('font.xml').getroot()
    # 定位到map节点
    base = root_obj.find('cmap').findall('cmap_format_4')[0].findall('map')
    # 这里主要是整个关系字典，将unicode方法和值对应起来
    all_dict = {}

    for i in base:
        all_dict[i.attrib['code'][2:]] = i.attrib['name']

    return all_dict


def replace_text(text, all_dict):
    for key in all_dict:
        text = text.replace('&#x' + key + ';', all_dict[key])

    print(text)

if __name__ == '__main__':
    # 下载woff文件
    html = download()

    # 转换为xml并得到字典
    dicts = transform()

    # 文本替换
    replace_text(html, dicts)