JS逆向爬虫---请求参数加密②【某麦数据analysis参数加密】

主页链接:
https://www.qimai.cn/rank

在这里插入图片描述

analysis逆向

完整参数生成代码如下：

const {JSDOM} = require('jsdom')
const dom = new JSDOM('<!DOCTYPE html><p>hello</p>')
window = dom.windowfunction customDecrypt(n, t) {t = t || generateKey();  // 如果没有提供 t，则使用默认密钥// 将字符串 n 分割成字符数组n = n.split("");for (var i = 0; i < n.length; i++) {// 对字符 n[i] 进行异或运算n[i] = String.fromCharCode(n[i].charCodeAt(0) ^ t.charCodeAt((i + 10) % t.length));}// 将字符数组拼接成字符串return n.join("");
};// 拼接a字符串
function a_for_bs64(t){var z = window;var Z = "Object";var i7 = "keys";var Zt = "params";var M = "forEach";var n;var N2 = "hasOwnProperty";var a = [];var b = "push";var Ot ="sort" ;var I1 = "join";var _ = "";z[Z][i7](t[Zt])[M](function (n) {t[Zt][N2](n) && a[b](t[Zt][n])});a = a[Ot]()[I1](_);console.log(a);return a
}function  analysis_gen(t){var d = "xyz517cda96efgh";var currentDate = new Date();// 获取毫秒级时间戳var timestampInMilliseconds = currentDate.getTime();a_start = a_for_bs64(t);console.log('a_start==>',a_start)a_mid_1 = btoa(a_start);// MzIwMjMtMTEtMDYzNmFsbGNuaXBob25lconsole.log('a_mid_1==>',a_mid_1);time_period = timestampInMilliseconds - 1661224081041;// time_period = 38050153244;a_end = a_mid_1+"@#"+t.url+"@#"+time_period+"@#"+"3";console.log("a_end==>",a_end);// 我生成的  MjAyMy0xMS0wNjMzNmFsbGNuaXBob25l@#/rank/indexPlus/brand_id/1@#38050153244@#3// 页面生成 "MjAyMy0xMS0wNjMzNmFsbGNuaXBob25l@#/rank/indexPlus/brand_id/1@#38050153244@#3"data = customDecrypt(a_end, d);e  = btoa(data);console.log(e);return e
};// 接受一个t的对象
const t = {"url": "/rank/indexPlus/brand_id/0","params": {"brand": "all","country": "cn","device": "iphone","genre": "36","date": "2023-11-06","page": 3},"baseURL": "https://api.qimai.cn",
};
// 将 params 对象拼接为查询字符串
const params = new URLSearchParams(t.params).toString();// 构建完整的 URL
const fullURL = `${t.baseURL}${t.url}?analysis=${analysis_gen(t)}&${params}`;console.log(fullURL);// 完整生成流程
// 1. 获取加密请求数据对象
// 2. 生成需要加密的字符串a_start
// 3. base64编码生成密文 a_mid_1
// 4. 获取毫秒时间戳与定义差值
// 5. 拼接密文，时间戳差值，请求uri，参数等，生成代编码字符串a_end
// 6. 结合密钥d生成待编码字符串 data
// 7. base64编码字符串生成最终的analysis参数