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toutiaonews's Introduction

今日头条

【转行三重奏】-爬虫Js逆向复习-今日头条as、cp、_signature参数分析。

变更记录

2020/1/10:调整_signature Function部分代码(截至日前有效)

2020/2/27:issue上朋友反映signature失效(因准备转行的关系不再维护,此项目已无实际用途,仅作为个人学习记录)。

逆向简述

1、feed关键字XHR断点,推测this._setParams这个方法生成as,cp参数,断点调试。

function a() {
    var t = Math.floor((new Date).getTime() / 1e3)
      , e = t.toString(16).toUpperCase()
      , i = (0,
    o.default)(t).toString().toUpperCase();
    if (8 != e.length)
        return {
            as: "479BB4B7254C150",
            cp: "7E0AC8874BB0985"
        };
    for (var n = i.slice(0, 5), a = i.slice(-5), s = "", r = 0; r < 5; r++)
        s += n[r] + e[r];
    for (var l = "", u = 0; u < 5; u++)
        l += e[u + 3] + a[u];
    return {
        as: "A1" + s + e.slice(-3),
        cp: e.slice(0, 3) + l + "E1"
    }
}
var s = i(128)
  , o = n(s);
t.exports = a
}

2、刷新页面时初始值为min_behot_time: 0,后续访问该键值对变化为前一请求的返回值例如max_behot_time: 1578627176。

3、_signature参数在页面加载完毕后全局搜索该关键字,发现该值由g.sign生成。执行g.sign发现js的anonymous应用了控制流平坦,直接处理较难。 XHR追踪

4、往上查找g对象寻找思路, o对象涵盖一些已经生成好函数,下列代码个人理解为若该函数已经生成则直接调用,不存在则进行生成。 g对象

function t(a) {
    if (o[a])
        return o[a].exports;
    var r = o[a] = {
        exports: {},
        id: a,
        loaded: !1
    };
    return e[a].call(r.exports, r, r.exports, t),
    r.loaded = !0,
    r.exports
}

5、那么a=87时候,e[a]表示的函数为下列代码,扣取JS运行时id并无实际用途,可省去。(注:需要先访问页面获取Cookie,否则拿不到数据)。

function(e, t) {
    Function(function(e) {
        return '�e(e,a,r){�(b[e]||(b[e]=t("x,y","�x "+e+" y"�)(r,a)}�a(e,a,r){�(k[r]||(k[r]=t("x,y","�new x[y]("+Array(r+1).join(",x[�y]")�(1)+")"�)(e,a)}�r(e,a,r){�n,t,s={},b=s.d=r?r.d+1:0;for(s["$"+b]=s,t=0;t<b;t�)s[n="$"+t]=r[n];for(t=0,b=s�=a�;t<b;t�)s[t]=a[t];�c(e,0,s)}�c(t,b,k){�u(e){v[x�]=e}�f�{�g=�,t�ing(b�g)}�l�{try{y=c(t,b,k)}catch(e){h=e,y=l}}for(�h,y,d,g,v=[],x=0;;)switch(g=�){case 1:u(!�)�4:�f��5:u(�(e){�a=0,r=e�;���{�c=a<r;�c&&u(e[a�]),c}}(���6:y=�,u(�(y��8:if(g=�,l��g,g=�,y===c)b+=g;else if(y!==l)�y�9:�c�10:u(s(���11:y=�,u(�+y)�12:for(y=f�,d=[],g=0;g<y�;g�)d[g]=y.charCodeAt(g)^g+y�;u(String.fromCharCode.apply(null,d��13:y=�,h=delete �[y]�14:���59:u((g=�)?(y=x,v.slice(x-=g,y�:[])�61:u(�[�])�62:g=�,k[0]=65599*k[0]+k[1].charCodeAt(g)>>>0�65:h=�,y=�,�[y]=h�66:u(e(t[b�],�,���67:y=�,d=�,u((g=�).x===c?r(g.y,y,g.z):g.apply(d,y��68:u(e((g=t[b�])<"<"?(b--,f�):g+g,�,���70:u(!1)�71:�n�72:�+f��73:u(parseInt(f�,36��75:if(�){b��case 74:g=�<<16>>16�g�76:u(k[�])�77:y=�,u(�[y])�78:g=�,u(a(v,x-=g+1,g��79:g=�,u(k["$"+g])�81:h=�,�[f�]=h�82:u(�[f�])�83:h=�,k[�]=h�84:�!0�85:�void 0�86:u(v[x-1])�88:h=�,y=�,�h,�y�89:u(��{�e�{�r(e.y,arguments,k)}�e.y=f�,e.x=c,e.z=k,e}�)�90:�null�91:�h�93:h=��0:��;default:u((g<<16>>16)-16)}}�n=this,t=n.Function,s=Object.keys||�(e){�a={},r=0;for(�c in e)a[r�]=c;�a�=r,a},b={},k={};�r'.replace(/[�-�]/g, function(t) {
            return e[15 & t.charCodeAt(0)]
        })
    }("v[x++]=�v[--x]�t.charCodeAt(b++)-32�function �return �))�++�.substr�var �.length�()�,b+=�;break;case �;break}".split("�")))()('g,$@drbms!l!n Иb/s"g,&Usz`dlms#g,.}jcb{|zFbxjx}~ms$g,(lfi~ah`{ms%g,)gk}ejo{�cms&g,&qnfme|ms\',!^s(,)|doikgauus),,j�abSysaWzrrs*,(|fY�~d`hs+,&jbfn~cs,,\'nfmosCks-,*icm�M`ttSgs.,&eoi{K�s/,)z�i�y|f~vs0l#l*ms10s2yWl ._b&s o ]1l l Jb<k$.aj;l .Tb<k$.gj/l .^b<k&i"-4j!�+& s3yPo ]3s!l!l Hd>&l!l Bd>&+l!l <d>&+l!l 6d>&+l!l &+ s4y=o o ]7q"21o l q"18o ]4l 2d>& s6{s5yMo o ]8q"21o ]2Ld<l 4d#>>>b|s!o l q"18o ]4l!& s7yIo o ]6q"21o ]4o ]2Jd<l 6d#>>>b|&o ]3l &+ s8yǽ,`�*&3#-r��:�\tt}a�6\'%`b\r�f\nkop\v\b�3%\bU-(�\t�1=%;���)�;��\r\rO?.>��/\t=�s!$ s"0s$l o ],ml$3+d">=kÝl vo ].mxl$v1+s$[!cįb&@d<l vo ].mxl$v1+s$[!cįb&8d<b|l vo ].mxl$v1+s$[!cįb&b|s#l"l!vo ]/mxl#i%9tz40b&Bd>[!c+s"l"l!vo ]/mxl#i$5j40b&<d>[!c+s"l"l!vo ]/mxl#࿰b&6d>[!c+s"l"l!vo ]/mxl#._b&[!c+s"jrl o ],ml$b-0b>kÑl vo ].mxl$v1+s$[!cįb&@d<l o ],ml$b>k6l vo ].mxl$[!cįb&8d<j!0b|s#l"l!vo ]/mxl#i%9tz40b&Bd>[!c+s"l"l!vo 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}

运行结果

使用说明

1、启动接口服务

cd nodeServer
node serverD.js

2、启动爬虫

Python run_the_spider.py

补充知识

1、什么是控制流平坦?

把代码逻辑变成统一的入口管理,而该前驱块依赖于switch变量进行基本块的分发。

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