解密阿里巴巴加密技术： 爬虫JS逆向实践-1688 JS混淆加密解析

Posted 2021-12-05 五包辣条！

大家好，我是辣条。

这是爬虫系列的36篇，爬虫之路永无止境。

爬取目标

网站：阿里巴巴1688.com - 全球领先的采购批发平台,批发网

 工具使用

开发工具：pycharm

开发环境：python3.7， Windows10

使用工具包：requests，urllib, time, re, execjs

重点学习的内容

1. JS混淆

2. 正则表达式的使用

3. py执行js文件的应用

4. 网页参数编码

页面分析

爬取:海量产地工厂，就上1688找工厂

h(d.token + "&" + i + "&" + g + "&" + c.data)

在这个JS代码前面打上断点，然后刷新页面，进行js调试。

d.token的生成 -> H5Request -> 在接口的请求头里面 的cookie 包含 改参数

i = 时间戳

g = 固定参数

c.data =请求参数

h 为 JS加密方法 把 hjs代码都扣下来 做一个单独的js文件。

 function h(a) {
        function b(a, b) {
            return a << b | a >>> 32 - b
        }
        function c(a, b) {
            var c, d, e, f, g;
            return e = 2147483648 & a,
            f = 2147483648 & b,
            c = 1073741824 & a,
            d = 1073741824 & b,
            g = (1073741823 & a) + (1073741823 & b),
            c & d ? 2147483648 ^ g ^ e ^ f : c | d ? 1073741824 & g ? 3221225472 ^ g ^ e ^ f : 1073741824 ^ g ^ e ^ f : g ^ e ^ f
        }
        function d(a, b, c) {
            return a & b | ~a & c
        }
        function e(a, b, c) {
            return a & c | b & ~c
        }
        function f(a, b, c) {
            return a ^ b ^ c
        }
        function g(a, b, c) {
            return b ^ (a | ~c)
        }
        function h(a, e, f, g, h, i, j) {
            return a = c(a, c(c(d(e, f, g), h), j)),
            c(b(a, i), e)
        }
        function i(a, d, f, g, h, i, j) {
            return a = c(a, c(c(e(d, f, g), h), j)),
            c(b(a, i), d)
        }
        function j(a, d, e, g, h, i, j) {
            return a = c(a, c(c(f(d, e, g), h), j)),
            c(b(a, i), d)
        }
        function k(a, d, e, f, h, i, j) {
            return a = c(a, c(c(g(d, e, f), h), j)),
            c(b(a, i), d)
        }
        function l(a) {
            for (var b, c = a.length, d = c + 8, e = (d - d % 64) / 64, f = 16 * (e + 1), g = new Array(f - 1), h = 0, i = 0; c > i; )
                b = (i - i % 4) / 4,
                h = i % 4 * 8,
                g[b] = g[b] | a.charCodeAt(i) << h,
                i++;
            return b = (i - i % 4) / 4,
            h = i % 4 * 8,
            g[b] = g[b] | 128 << h,
            g[f - 2] = c << 3,
            g[f - 1] = c >>> 29,
            g
        }
        function m(a) {
            var b, c, d = "", e = "";
            for (c = 0; 3 >= c; c++)
                b = a >>> 8 * c & 255,
                e = "0" + b.toString(16),
                d += e.substr(e.length - 2, 2);
            return d
        }
        function n(a) {
            a = a.replace(/\\r\\n/g, "\\n");
            for (var b = "", c = 0; c < a.length; c++) {
                var d = a.charCodeAt(c);
                128 > d ? b += String.fromCharCode(d) : d > 127 && 2048 > d ? (b += String.fromCharCode(d >> 6 | 192),
                b += String.fromCharCode(63 & d | 128)) : (b += String.fromCharCode(d >> 12 | 224),
                b += String.fromCharCode(d >> 6 & 63 | 128),
                b += String.fromCharCode(63 & d | 128))
            }
            return b
        }
        var o, p, q, r, s, t, u, v, w, x = [], y = 7, z = 12, A = 17, B = 22, C = 5, D = 9, E = 14, F = 20, G = 4, H = 11, I = 16, J = 23, K = 6, L = 10, M = 15, N = 21;
        for (a = n(a),
        x = l(a),
        t = 1732584193,
        u = 4023233417,
        v = 2562383102,
        w = 271733878,
        o = 0; o < x.length; o += 16)
            p = t,
            q = u,
            r = v,
            s = w,
            t = h(t, u, v, w, x[o + 0], y, 3614090360),
            w = h(w, t, u, v, x[o + 1], z, 3905402710),
            v = h(v, w, t, u, x[o + 2], A, 606105819),
            u = h(u, v, w, t, x[o + 3], B, 3250441966),
            t = h(t, u, v, w, x[o + 4], y, 4118548399),
            w = h(w, t, u, v, x[o + 5], z, 1200080426),
            v = h(v, w, t, u, x[o + 6], A, 2821735955),
            u = h(u, v, w, t, x[o + 7], B, 4249261313),
            t = h(t, u, v, w, x[o + 8], y, 1770035416),
            w = h(w, t, u, v, x[o + 9], z, 2336552879),
            v = h(v, w, t, u, x[o + 10], A, 4294925233),
            u = h(u, v, w, t, x[o + 11], B, 2304563134),
            t = h(t, u, v, w, x[o + 12], y, 1804603682),
            w = h(w, t, u, v, x[o + 13], z, 4254626195),
            v = h(v, w, t, u, x[o + 14], A, 2792965006),
            u = h(u, v, w, t, x[o + 15], B, 1236535329),
            t = i(t, u, v, w, x[o + 1], C, 4129170786),
            w = i(w, t, u, v, x[o + 6], D, 3225465664),
            v = i(v, w, t, u, x[o + 11], E, 643717713),
            u = i(u, v, w, t, x[o + 0], F, 3921069994),
            t = i(t, u, v, w, x[o + 5], C, 3593408605),
            w = i(w, t, u, v, x[o + 10], D, 38016083),
            v = i(v, w, t, u, x[o + 15], E, 3634488961),
            u = i(u, v, w, t, x[o + 4], F, 3889429448),
            t = i(t, u, v, w, x[o + 9], C, 568446438),
            w = i(w, t, u, v, x[o + 14], D, 3275163606),
            v = i(v, w, t, u, x[o + 3], E, 4107603335),
            u = i(u, v, w, t, x[o + 8], F, 1163531501),
            t = i(t, u, v, w, x[o + 13], C, 2850285829),
            w = i(w, t, u, v, x[o + 2], D, 4243563512),
            v = i(v, w, t, u, x[o + 7], E, 1735328473),
            u = i(u, v, w, t, x[o + 12], F, 2368359562),
            t = j(t, u, v, w, x[o + 5], G, 4294588738),
            w = j(w, t, u, v, x[o + 8], H, 2272392833),
            v = j(v, w, t, u, x[o + 11], I, 1839030562),
            u = j(u, v, w, t, x[o + 14], J, 4259657740),
            t = j(t, u, v, w, x[o + 1], G, 2763975236),
            w = j(w, t, u, v, x[o + 4], H, 1272893353),
            v = j(v, w, t, u, x[o + 7], I, 4139469664),
            u = j(u, v, w, t, x[o + 10], J, 3200236656),
            t = j(t, u, v, w, x[o + 13], G, 681279174),
            w = j(w, t, u, v, x[o + 0], H, 3936430074),
            v = j(v, w, t, u, x[o + 3], I, 3572445317),
            u = j(u, v, w, t, x[o + 6], J, 76029189),
            t = j(t, u, v, w, x[o + 9], G, 3654602809),
            w = j(w, t, u, v, x[o + 12], H, 3873151461),
            v = j(v, w, t, u, x[o + 15], I, 530742520),
            u = j(u, v, w, t, x[o + 2], J, 3299628645),
            t = k(t, u, v, w, x[o + 0], K, 4096336452),
            w = k(w, t, u, v, x[o + 7], L, 1126891415),
            v = k(v, w, t, u, x[o + 14], M, 2878612391),
            u = k(u, v, w, t, x[o + 5], N, 4237533241),
            t = k(t, u, v, w, x[o + 12], K, 1700485571),
            w = k(w, t, u, v, x[o + 3], L, 2399980690),
            v = k(v, w, t, u, x[o + 10], M, 4293915773),
            u = k(u, v, w, t, x[o + 1], N, 2240044497),
            t = k(t, u, v, w, x[o + 8], K, 1873313359),
            w = k(w, t, u, v, x[o + 15], L, 4264355552),
            v = k(v, w, t, u, x[o + 6], M, 2734768916),
            u = k(u, v, w, t, x[o + 13], N, 1309151649),
            t = k(t, u, v, w, x[o + 4], K, 4149444226),
            w = k(w, t, u, v, x[o + 11], L, 3174756917),
            v = k(v, w, t, u, x[o + 2], M, 718787259),
            u = k(u, v, w, t, x[o + 9], N, 3951481745),
            t = c(t, p),
            u = c(u, q),
            v = c(v, r),
            w = c(w, s);
        var O = m(t) + m(u) + m(v) + m(w);
        return O.toLowerCase()
    }

代码实现

import requests
from urllib import parse
import time
import re
import execjs
​
​
time1 = int(time.time() * 1000)
with open('./567.js', 'r', encoding='utf-8') as f:
    ctx = execjs.compile(f.read()) # 执行读取的js代码
data = {"cid":"FactoryRankServiceWidget:FactoryRankServiceWidget","methodName":"execute","params":"{\\"extParam\\":\\"{\\\\\\"methodName\\\\\\":\\\\\\"readRelatedRankEntries\\\\\\",\\\\\\"cateId\\\\\\":7,\\\\\\"size\\\\\\":15}\\"}"}
headers = {
    'cookie': 'xlly_s=1; cna=s+HmGas+MCYCAXHwrb3t4n2g; ali_ab=240e:383:515:6f10:7c53:a1a0:ef97:a0ef.1635751613086.3; taklid=13ffc206f13c40139dcae830da1cd7a6; _m_h5_tk=9ef09cb41d7419fc32115e5eb51faa1a_1635776795184; _m_h5_tk_enc=90cb68510dccd56f830c770f0c4c9c16; alicnweb=touch_tb_at%3D1635768129101; unb=3346228600; cookie2=1bc1323f3cdd57911a40c00689bdd4cb; t=ad0b0773e5f83f3f46a8ad3ddbfb3d0b; _tb_token_=73b3e307beabe; __cn_logon__=false; UM_distinctid=17cdb6e180d368-0dd745c063c1f4-57b193e-1fa400-17cdb6e180e8ba; _csrf_token=1635769062782; keywordsHistory=%E7%94%B5%E8%84%91%3B%E7%BE%8E%E5%A6%86%3B%E7%AC%94%E8%AE%B0%E6%9C%AC%E7%94%B5%E8%84%91%3B%E7%94%B7%E7%94%9F%E5%A4%96%E5%A5%97%3B%E7%AB%A5%E8%A3%85%3B%E6%A3%89%E8%A2%AB; tfstk=cRB1Bw2q2V0_qEVqQGZEu20xQkv1ZXiWc5TGfsOGJ1eSpeS1iDDyPyvFiqd9KH1..; l=eBOC4p3VgzVguXHhXOfwourza77t7IRAguPzaNbMiOCP9T5w5HedW6UhmPTeCnGVh6zpR3WAVUVzBeYBqojidj4Kwp0OeOkmn; isg=BOjoTlOAHfQCkTFQpHAklfc6udb6EUwbw0DEqqIZLGNW_YhnSiBDq_m79ZUNTQTz',
    'user-agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (Khtml, like Gecko) Chrome/95.0.4638.54 Safari/537.36'
}
# token 生成
token = re.findall('_m_h5_tk=(.+?)_', headers['cookie'], re.S)[0]
appKey = "12574478"
p = (token + '&' + str(time1) + '&' + appKey + '&' + str(data))
sign = ctx.call('h', p)
url = f'https://h5api.m.1688.com/h5/mtop.taobao.widgetservice.getjsoncomponent/1.0/?jsv=2.4.11&appKey=12574478&t={str(time1)}&sign={sign}&api=mtop.taobao.widgetService.getJsonComponent&v=1.0&type=jsonp&isSec=0&timeout=20000&dataType=jsonp&callback=mtopjsonp9&'
# 需要转码  因为网页的 urldata是 转码后的
urls = url + 'data=' + parse.quote(str(data))
# print(sign)
response = requests.get(urls, headers=headers).text
print(response)

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