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爬虫逆向--Day22Day23--核心实战案例【四川农机购置与补贴信息】【Webpack国密SM3、SM4】

news 2025/9/20 7:10:17

案例地址链接：http://202.61.89.161:12021/subsidyOpen

案例爬取链接：http://202.61.89.161:12021/api/api/loginSidePageEDE/getPurchaseOfAgriculturalMachinery

一、方式一：Webpack

1.1、入口定位

首先当我们开始编写爬虫操作的时候，我们先确定目标链接，然后复制url到【https://curlconverter.com/】生成基础的爬虫代码，复制链接生成基础爬虫代码有个时间的限制，刚生成的基础爬虫代码是可以拿到数据的，但是当时间过期后，就拿不到数据了。

然后在观察目标的url那些是加密，方便我们后续进行解密操作

经过观察，响应--需要解密，请求---需要加密，请求头--需要加密

所以我们习惯性的先破解----响应解密

在之前的学习中，我们定位入口有很多种方式，比如：方法关键字【decrypt encrypt 】、key关键字、headers关键字、路径关键字、interceptors 拦截器关键字、请求堆栈、地址关键字等等。

因为习惯性的有相应解密，我们优先进行做响应解密，所以我们通过搜索decrypt(，进行搜索定位

因为是做解密所以首先想到的是decrypt(，搜索结果是6个，不管是不是先把断点打上确定解密的入口

1.2、代码分析

做解密就是做解密，先不要管加密

通过查看代码得知，u(e)就是解密函数，o是不是一个固定值不知道，我们可以通过多次切换页码确定每次卡在该处时，得到的o是不是一样的，如果是一样的那么o就是一个固定值，经过确定o是一个固定值

o = "30062AFC48C0E7B5B0918851C0445A37"

所以把这个u函数直接拷贝到本地去执行

1.3、扣JS

所以把这个u(e) 函数直接拷贝到本地去执行

看到这里就会联想到，可以使用webpack和sm4两种方式可以进行操作

在l= 这个地方加和上面加都一样，然后去找加载器函数n 在l= 这里加，刷新页面让卡在此处

1.4、补充依赖【】

当我们把u() 函数扣走以后，在断点处，打上断点，获取测试数据

__webpack_require__ 其实就是模板中的n

moduleId 其实就是 r

installedModules 其实就是t

就是格式还是webpack的格式就是编写变得负责了，所以我们看到是加载器函数，直接吧整个文件拷贝走

直接吧加载器函数全部拷贝走【Ctrl+A Ctrl+C】然后进行下面的操作

1、在本地创建一个loader.js文件，【Ctrl+v】存放刚才拷贝的代码

2、添加全局window 和打印的log日志　　

　　添加全局window , 使用；或者！进行分割代码：window = global;

　　添加日志log

代码处理如下：

执行一下是缺少一个window 写一下window放在最上面 window = global 给下面的自执行函数，做一个分割，加一个;或者加一个！

看完匿名函数，下面有属性赋值，就可以在这里添加全局写入 window.loader = __webpack_require__

运行代码，只要不报错，证明加载器函数处理完成。

然后在最初的JS文件中，进行引用该加载器函数，并且调用，不出意外就会报某个模块找不到

【然后运行，就会报：模块找不到，这个时候就全局搜索webpack中的模块】

从window的这个属性中去拿数据，所以我们需要全局搜索这个8060这个模块，最好是加一个：搜索8060：

找到以后直接拷贝，放到mod01中

以上就完成了响应解密的数据，下面我们就需要进行请求加密了

往上看，请求加密就在上面，打上断点，刷新一下页面就是这里不会无缘无故的在一起的

做响应解密的时候，其实跟加密距离，离的很近

直接把encrypt这个d方法直接拷贝走

l 已经有了

以上是把响应解密和请求加密都处理完了，下面就需要处理请求头中的三个参数了 Sign Source Timestamp

当我们把加密和解密都替换完成以后，如果不处理headers中的三个参数，是依然不能直接获取到数据

或者，重新生成一个基础爬虫代码，这个时候正常是可以拿到加密的响应数据的，然后在挨个把headers中的三个字段注释掉，看看这三个字段是不是必填项，

我们也可以通过key关键字，优先搜索Source \bsource\b 打开正则中的边界

可以判断source这三个字段都在一起，其他都没在一起，所以其他都不是

方式一：通过扣JS代码，补充环境以来进行获取请求头中的三个字段

所以正常既然p()是获取这三个请求头的函数，那么就把p()函数直接扣走，缺什么补什么

报h找不到，我们就把上面的h扣走

报a找不到，网上找发现a和webpack有关系，所以可以拿过来直接用 var a = n("53ca")

又报r找不到，往上找r函数直接扣走

报s找不到，往上找发现也是和webpack有关系，因为本地有了webpack环境，所以直接扣走 var s = n("8060").sm3;

方式二：通过上层调用的，获悉得到还是webpack，直接通过已经存在的webpack直接得到即可

require("./05 mod02")    // 引入模块文件   引入文件执行文件，即可完成

1.5、代码文件

1.5.1、Python文件：01 butie.py

import requests
import execjs
import jsonjs_compile = execjs.compile(open("02 butie.js", encoding="utf-8").read())headers = {'Accept': 'application/json, text/plain, */*','Accept-Language': 'zh-CN,zh;q=0.9','Connection': 'keep-alive','Content-Type': 'application/json;charset=UTF-8','Origin': 'http://202.61.89.161:12021','User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/128.0.0.0 Safari/537.36','sign': 'd221aad291969e853e13fbaf26e6ba371b0707c41e2471fc62de03a90087ce550e657201a92abf9be4c3e13545c9197ac7028d07d049e38dc84c74dec54c12e5ba532c7c82c95484140e5a9ffbe7ae48','source': 'ZRCSL7V0JIRK1PHY','timestamp': 'b3ce7631c4857f64e7004b47932e9692','urlprefix': '',
}# 把断点定位l.encrypt(e, o);  获取e的值，作为查询参数
# 这个data是Python中的字典，可以理解为是查询参数  有关键作用的就是pageNum  pageSize和我们的批量获取数据有关系
data = {"applyType": 1,"year": 2025,"buyerName": "","code": "","areaCode": "","status": "","distributor": "","enterpriseId": "","factoryNumber": "","machineCode": "","purchaseDateStart": "","purchaseDateEnd": "","pageNum": 3,"pageSize": 15}# (1) 生成parameter   加密的时候传进去的需要是一个json字符串  所以需要把python中的字典转化成为json字符串
parameter = js_compile.call("d", json.dumps(data))data = {"parameter": parameter
}# (2) 生成header值  传进入的需要是一个parameter对象
ret = js_compile.call("get_sign", data)
print("ret:::", ret)
# ret 中的键值对是否在headers 中存在，如果存在就更新一下对应的value 如果没有就把ret中的键值对全部插进去
headers.update(ret)json_data = {'parameter': '41a69732cb266f361a31837c0916648bb8291635c087e530d1a25683d1160ee6265dcefe370b55d7e6ac9aca916fd2136f93e8f4248b1bda1f084d3d281ef4c558c2386e83cbef7944b0cd502dac9fd4ded0caf3a0cb7f2a9dd1907d1e576b5d33b825d1dcfce86ad6f94db52e8f3603d3bd888641a2889ea2fdc6b66ce28a36fd06b8dab3ce2b23a291932e42192719ce2c68f7dff16888924b7c383b33663c74c74a194438fc847eed16c0e16a3667954f332d0418d865537f467f329fe9a1bb98f9d3d4bcb55c384304a8a62bba72f7e663f5b8c725b71304213cab17de23',
}
url = 'http://202.61.89.161:12021/api/api/loginSidePageEDE/getPurchaseOfAgriculturalMachinery'response = requests.post(url=url, headers=headers, json=data, verify=False, )
print(response.text)# (3) 响应解密
data = js_compile.call("u", response.json().get("data"))
print(data)

1.5.2、JS文件：02 butie.js

require("./03 loader")   // 引入加载器函数
require("./04 mod01")    // 引入模块文件
require("./05 mod02")    // 引入模块文件
n = window.loader        // 给加载器赋值
var l = n("8060").sm4;   // 调用加载器的某个模块function u(e) {var t = l.decrypt(e, "30062AFC48C0E7B5B0918851C0445A37");return t
}// 响应解密测试
//data_1 = 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'
//console.log(u(data_1))// 请求加密测试
function d(e) {var t = l.encrypt(e, "30062AFC48C0E7B5B0918851C0445A37");return t
}// 外面改成 ' '  里面不能改成单引号，里面改成单引号，就不是json字符串了
// data_2 = '{"applyType":1,"year":2025,"buyerName":"","code":"","areaCode":"","status":"","distributor":"","enterpriseId":"","factoryNumber":"","machineCode":"","purchaseDateStart":"","purchaseDateEnd":"","pageNum":2,"pageSize":15}'
// console.log(d(data_2))// 方式一
// function r(e) {
//     var t = s(e);
//     return t
// }
//
// function h(e) {
//     var t = JSON.parse(e)
//         , n = Object.keys(t).sort()
//         , i = n.map((function (e) {
//             var n = t[e];
//             if (n) {
//                 var i = ""
//                     , c = encodeURIComponent(e);
//                 return i = "object" === Object(a["a"])(n) ? JSON.stringify(n) : n,
//                     "".concat(c, "=").concat(i)
//             }
//         }
//     ));
//     i = i.filter((function (e) {
//             return void 0 !== e && null !== e && "" !== e
//         }
//     ));
//     var c = i.join("&");
//     return c
// }
//
// function p(e) {
//     var t, n = Date.now();
//     return e ? (e = JSON.parse(u(e.parameter)),
//         e.timestamp = n,
//         e = JSON.stringify(e),
//         t = h(e),
//         t += "&key=HD7232D2AAAKA@978D8723H211?IER&6",
//         {
//             sign: d(r(t).toLocaleUpperCase()),
//             timestamp: d(n.toString()),
//             source: "ZRCSL7V0JIRK1PHY"
//         }) : (e = e || {},
//         e.timestamp = n,
//         e = JSON.stringify(e),
//         t = h(e),
//         t += "&key=HD7232D2AAAKA@978D8723H211?IER&6",
//         {
//             sign: d(r(t).toLocaleUpperCase()),
//             timestamp: d(n.toString()),
//             source: "ZRCSL7V0JIRK1PHY"
//         })
// }
//
//
// var a = n("53ca")
// var s = n("8060").sm3;
//
// dict = {
//     "parameter": "41a69732cb266f361a31837c0916648bb8291635c087e530d1a25683d1160ee6265dcefe370b55d7e6ac9aca916fd2136f93e8f4248b1bda1f084d3d281ef4c558c2386e83cbef7944b0cd502dac9fd4ded0caf3a0cb7f2a9dd1907d1e576b5d33b825d1dcfce86ad6f94db52e8f3603d3bd888641a2889ea2fdc6b66ce28a36fd06b8dab3ce2b23a291932e42192719ce2c68f7dff16888924b7c383b33663c74c74a194438fc847eed16c0e16a3667954f332d0418d865537f467f329fe9a1bb98f9d3d4bcb55c384304a8a62bba72f7e663f5b8c725b71304213cab17de23"
// }
// console.log(p(dict))// 方式二//r = a("dd88")    // 其实a这个加载器函数，就是n加载器函数，所以这里我们可以直接替换，把a替换成n
r = n("dd88")
function get_sign(data){return r["c"](data)
}dict = {"parameter": "41a69732cb266f361a31837c0916648bb8291635c087e530d1a25683d1160ee6265dcefe370b55d7e6ac9aca916fd2136f93e8f4248b1bda1f084d3d281ef4c558c2386e83cbef7944b0cd502dac9fd4ded0caf3a0cb7f2a9dd1907d1e576b5d33b825d1dcfce86ad6f94db52e8f3603d3bd888641a2889ea2fdc6b66ce28a36fd06b8dab3ce2b23a291932e42192719ce2c68f7dff16888924b7c383b33663c74c74a194438fc847eed16c0e16a3667954f332d0418d865537f467f329fe9a1bb98f9d3d4bcb55c384304a8a62bba72f7e663f5b8c725b71304213cab17de23"
}
console.log(get_sign(dict))

1.5.3、加载器函数文件：03 loader.js

window = global;
/******/
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1.5.4、模块文件：04 mod01.js

1.5.5、模块文件：05 mod02.js

二、方式二：国密SM3、SM4

const sm = require("sm-crypto")   // npm install sm-crypto  执行这个进行导包

由上图的代码： var l = n("8060").sm4; 我们应该首选SM4国密算法，如果不认识或者不知道，那就按照正常的操作webpack，如果知道是SM4，那么最好还是使用国密算法

如果想调用这个SM4或者SM3就不一定必须使用代码中的 n("8060") 这个webpack对象了，可以直接导包调用，如果不知道可以直接使用deepseek查询

2.1、代码文件02 butie.js

const sm = require("sm-crypto")   // npm install sm-crypto  执行这个进行导包
var l = sm.sm4;   // 调用加载器的某个模块function u(e) {var t = l.decrypt(e, "30062AFC48C0E7B5B0918851C0445A37");return t
}//响应解密测试
// data_1 = 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44fae9069bf746e220067dcaa7f49241ea0b5e62659fc145d55c39dc50a1d8470ca97f6c6929bbcf31ff8c30b36766688c49d79968de1ca3661a14d54896a7892d23a108af06caa989e842240bd19353b24e7c89e30b00eacf7182505397c3f238186a0bcceefec1c28b891bb0b5666c2f7773e8114c0f83d7be9a8d1dccf19bedbadc89430d650930e3012d20cdc95262bb5b250a37537444fa93b406b59c257ba77fe6a39e2d32579ed4f1eaacca9e2deada9bf44d82c357aa8820041f1d9c2099d7aba906c454f4bbdc1b2e1f5896fed5c234c229814f9a31a7957f334f25b0a42fb3902bd4e51e75eead0fa96323be3d896a03a645f0b718249c1eee0fa0c3d579d489e51533f13ed458ef07a6c1de8f5573af220a806a7ef87fe32a877aaa589e66204501c667ecfd7f9f42d1eb9f7dba3bb3f97f7eadd85ce05124426cf263192e0cd72480b46b1310b986809302f628eb674c14fdfa51cb81cd859ee8d'
// console.log(u(data_1))// 请求加密测试
function d(e) {var t = l.encrypt(e, "30062AFC48C0E7B5B0918851C0445A37");return t
}// 外面改成 ' '  里面不能改成单引号，里面改成单引号，就不是json字符串了
// data_2 = '{"applyType":1,"year":2025,"buyerName":"","code":"","areaCode":"","status":"","distributor":"","enterpriseId":"","factoryNumber":"","machineCode":"","purchaseDateStart":"","purchaseDateEnd":"","pageNum":2,"pageSize":15}'
// console.log(d(data_2))//方式一
function r(e) {var t = s(e);return t
}function h(e) {var t = JSON.parse(e), n = Object.keys(t).sort(), i = n.map((function (e) {var n = t[e];if (n) {var i = "", c = encodeURIComponent(e);// return i = "object" === Object(a["a"])(n) ? JSON.stringify(n) : n,//     "".concat(c, "=").concat(i)// 前端的逗号操作符返回最后一个表达式的结果  所以可以直接替换return  "".concat(c, "=").concat(i)}}));i = i.filter((function (e) {return void 0 !== e && null !== e && "" !== e}));var c = i.join("&");return c
}function p(e) {var t, n = Date.now();return e ? (e = JSON.parse(u(e.parameter)),e.timestamp = n,e = JSON.stringify(e),t = h(e),t += "&key=HD7232D2AAAKA@978D8723H211?IER&6",{sign: d(r(t).toLocaleUpperCase()),timestamp: d(n.toString()),source: "ZRCSL7V0JIRK1PHY"}) : (e = e || {},e.timestamp = n,e = JSON.stringify(e),t = h(e),t += "&key=HD7232D2AAAKA@978D8723H211?IER&6",{sign: d(r(t).toLocaleUpperCase()),timestamp: d(n.toString()),source: "ZRCSL7V0JIRK1PHY"})
}var s = sm.sm3;dict = {"parameter": "41a69732cb266f361a31837c0916648bb8291635c087e530d1a25683d1160ee6265dcefe370b55d7e6ac9aca916fd2136f93e8f4248b1bda1f084d3d281ef4c558c2386e83cbef7944b0cd502dac9fd4ded0caf3a0cb7f2a9dd1907d1e576b5d33b825d1dcfce86ad6f94db52e8f3603d3bd888641a2889ea2fdc6b66ce28a36fd06b8dab3ce2b23a291932e42192719ce2c68f7dff16888924b7c383b33663c74c74a194438fc847eed16c0e16a3667954f332d0418d865537f467f329fe9a1bb98f9d3d4bcb55c384304a8a62bba72f7e663f5b8c725b71304213cab17de23"
}
console.log(p(dict))

2.2、JS代码中的逗号操作符

i = "object" === Object(a["a"])(n) ? JSON.stringify(n) : n,
"".concat(c, "=").concat(i)

这里涉及到 JavaScript 的运算符优先级 和 逗号操作符 的特性。

逗号操作符的特性

在 JavaScript 中，逗号操作符 会按顺序执行多个表达式，但只返回最后一个表达式的结果。

let result = (表达式1, 表达式2, 表达式3);
// 执行顺序：表达式1 → 表达式2 → 表达式3
// 返回结果：表达式3的值

你的代码分析

i = "object" === Object(a["a"])(n) ? JSON.stringify(n) : n,
"".concat(c, "=").concat(i)

这实际上是一个 逗号操作符 表达式，包含两个子表达式：

第一个表达式（赋值）：

i = "object" === Object(a["a"])(n) ? JSON.stringify(n) : n

执行三元运算
将结果赋值给变量 i
这个表达式的结果是赋值后的 i 值

第二个表达式（字符串拼接）：

"".concat(c, "=").concat(i)

拼接字符串
这个表达式的结果是最终的参数字符串

为什么执行后面的操作？

因为逗号操作符返回最后一个表达式的结果，所以整个语句的结果是第二个表达式的结果

等价代码写法

// 你的代码相当于// 等价一
// 先执行赋值
let i = "object" === Object(a["a"])(n) ? JSON.stringify(n) : n;// 然后执行并返回拼接结果
"".concat(c, "=").concat(i);// 等价二
const result = (i = "object" === Object(a["a"])(n) ? JSON.stringify(n) : n,`${c}=${i}`
);
// result 包含最终的参数字符串

运算符优先级说明

优先级从高到低：

三元运算符 ? :
赋值运算符 =
逗号操作符 ,

所以你的代码被解析为：

(i = (三元运算结果)), (字符串拼接操作)

总结

逗号操作符 按顺序执行所有表达式
但只返回 最后一个表达式 的结果
前面的表达式通常用于 副作用（如赋值）
这是一种简洁但可能降低可读性的写法

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