兼容下载页面不直接返回页面信息，而是先返回一个自动计算acw_sc__v2后加入cookie然后自动reload获取正常页面的情况 #55

fzls · 2021-03-26T14:11:56Z

现象

今天发现在特定情况下（目前怀疑是一个链接被下载过多次），访问文件页面不会直接返回相关信息，导致get_file_info_by_url不能正常解析出相关信息

原因分析

经过调试发现，在这种情况下，会返回一个混淆后的页面，该页面会基于页面开头的一个变量，计算出一个acw_sc__v2添加到cookie中，之后自动重载页面，这时候服务器才会返回正常的页面

问题解决

通过搜索混淆页面中的特定关键词，找到了一个参考资料 https://zhuanlan.zhihu.com/p/228507547 ，基于该文章，实现了计算该cookie的逻辑，并在发现页面包含关键词var arg1=时，可以认为是出现了这种情况，这时候计算出cookie后添加到session中，然后重新请求页面就能获得正常的信息了

示例

在chrome打开devtool，访问https://fzls.lanzous.com/iDBM7nbkzti （不一定能复现，似乎在判定为爬虫时才会触发）
会发现第一次请求返回的是形如下面内容的页面，之后会再次请求，cookie中会增加一个acw_sc__v2字段，并返回正常页面信息

    <html>
    <script>
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zaxtyson · 2021-04-07T06:11:48Z

不好意思很久没上线,现在才看到哈哈😅
看起来是 sojson v6 类似的加密方式

fzls · 2021-04-07T07:05:08Z

不好意思很久没上线,现在才看到哈哈😅
看起来是 sojson v6 类似的加密方式

原来叫这名字吗=、=之前都没接触过哈哈，还是靠搜里面几个看上去就很有特征的变量名搜出来的解决方案

zaxtyson · 2021-04-07T07:18:32Z

之前抓一些网站的时候碰到过 sojson v5 v6, 其实都差不多, 严格来说是代码混淆.
就是把正常的数学运算、函数名混淆，改名打乱扔到数组里面，数组的 key 是一个随机的字符串用 RC4 计算出来的，通过 函数数组[Rc4("加密后字符串", "密钥")] 的方式来调用函数，有时还把正常的函数调用顺序打乱😄

fzls · 2021-04-07T07:20:58Z

刚去搜了你说的那个，应该不是同一个。不过基本原理就是一样的，说是加密，其实就是混淆，因为那坨代码在console里执行效果跟不混淆前其实完全一样，就是让你难以直接理解它到底在干啥哈哈哈，不易copy走

zaxtyson · 2021-04-07T07:23:10Z

官方越来越会整事情了🤪

taozhiyu · 2022-11-06T10:36:57Z

什么jsjiami.v6。。。
学名叫做obfuscate混淆
国内某些人钻协议漏洞收费罢了

兼容下载页面不直接返回页面信息，而是先返回一个自动计算acw_sc__v2后加入cookie然后自动reload获取正常页面的情况

b57660c

zaxtyson merged commit 03c5543 into zaxtyson:master Apr 7, 2021

zaxtyson added the enhancement New feature or request label Apr 7, 2021

zaxtyson added a commit that referenced this pull request Apr 7, 2021

fixed #55

d532fb6

fzls mentioned this pull request May 9, 2021

get_folder_info_by_url也需要处理js加密 #58

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兼容下载页面不直接返回页面信息，而是先返回一个自动计算acw_sc__v2后加入cookie然后自动reload获取正常页面的情况 #55

兼容下载页面不直接返回页面信息，而是先返回一个自动计算acw_sc__v2后加入cookie然后自动reload获取正常页面的情况 #55

fzls commented Mar 26, 2021 •

edited

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zaxtyson commented Apr 7, 2021

fzls commented Apr 7, 2021

zaxtyson commented Apr 7, 2021

fzls commented Apr 7, 2021

zaxtyson commented Apr 7, 2021

taozhiyu commented Nov 6, 2022

兼容下载页面不直接返回页面信息，而是先返回一个自动计算acw_sc__v2后加入cookie然后自动reload获取正常页面的情况 #55

兼容下载页面不直接返回页面信息，而是先返回一个自动计算acw_sc__v2后加入cookie然后自动reload获取正常页面的情况 #55

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fzls commented Mar 26, 2021 • edited Loading

现象

原因分析

问题解决

示例

zaxtyson commented Apr 7, 2021

fzls commented Apr 7, 2021

zaxtyson commented Apr 7, 2021

fzls commented Apr 7, 2021

zaxtyson commented Apr 7, 2021

taozhiyu commented Nov 6, 2022

fzls commented Mar 26, 2021 •

edited

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