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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）。

回到总目录

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。

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。

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=,ting(bg)}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:f5:u((e){a=0,r=e;{c=a<r;c&&u(e[a]),c}}(6:y=,u((y8:if(g=,lg,g=,y===c)b+=g;else if(y!==l)y9:c10: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,d13: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)>>>065:h=,y=,[y]=h66:u(e(t[b],,67:y=,d=,u((g=).x===c?r(g.y,y,g.z):g.apply(d,y68:u(e((g=t[b])<"<"?(b--,f):g+g,,70:u(!1)71:n72:+f73:u(parseInt(f,3675:if(){bcase 74:g=<<16>>16g76:u(k[])77:y=,u([y])78:g=,u(a(v,x-=g+1,g79:g=,u(k["$"+g])81:h=,[f]=h82:u([f])83:h=,k[]=h84:!085:void 086:u(v[x-1])88:h=,y=,h,y89:u({e{r(e.y,arguments,k)}e.y=f,e.x=c,e.z=k,e})90:null91:h93: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)]
        })
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        value: !0
    })])
}

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。