• 绿肥红瘦专栏数据的爬取

    前言

    要想爬专栏，先得爬用户。要想爬用户，三个header参数挡住了去路：x-zst-81，x-zse-93，x-zse-96，经过搜索x-zse-96，定位到设置该字段的位置：

    在这里插入图片描述
    这个t2是固定的值，t0来自于ed()函数的返回：

    function ed(tt, te, tr, ti) {
        var ta = tr.zse93,
        tu = tr.dc0,
        tc = tr.xZst81,
        tf = t4(tt),
        td = t6(te),
        tp = [
          ta,
          tf,
          tu,
          t7(td) &&
          td,
          tc
        ].filter(Boolean).join('+');
        return {
          source: tp,
          signature: (0, tJ(ti).encrypt) (ty() (tp))
        }
      }

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    在这里插入图片描述
    可以看出，源字符串由多个字段用加号连接而成。目前有值的就三个字段：一个固定值，一个uri值，一个dc0值，dc0值和cookie的d_c0字段一致。经过比对，发现ty()函数其实就是md5作用一下。所以核心的加密算法隐藏在encrypt()方法内。

    调用了tJ()函数的encrypt方法，继续跟踪：

    在这里插入图片描述
    看到tv.ZP()函数为加密函数，进去：
    在这里插入图片描述

    通过比对，判断出加密过程是source先md5然后调用了上述的D()函数加密。
    在控制台测试D()函数，随意输入几个字符串，发现对于同一字符串，每次返回结果不一样。
    通过抠代码，将D()函数提取了出来：

    const jsdom = require('jsdom');
const { JSDOM } = jsdom;
const dom = new JSDOM('
    Test
    '    );
// eslint-disable-next-line no-undef
var window = dom.window;
var document = window.document;
XMLHttpRequest = window.XMLHttpRequest;


  var x = function (tt) {
      return C(tt) ||
        s(tt) ||
        t()
    },
    C = function (tt) {
      if (Array.isArray(tt)) {
        for (var te = 0, tr = Array(tt.length); te < tt.length; te++) tr[te] = tt[te];
        return tr
      }
    },
    s = function (tt) {
      if (
        Symbol.A in Object(tt) ||
        '[object Arguments]' === Object.prototype.toString.call(tt)
      ) return Array.from(tt)
    },
    t = function () {
      throw TypeError('Invalid attempt to spread non-iterable instance')
    },
    i = function (tt, te, tr) {
      te[tr] = 255 & tt >>> 24,
        te[tr + 1] = 255 & tt >>> 16,
        te[tr + 2] = 255 & tt >>> 8,
        te[tr + 3] = 255 & tt
    },
    B = function (tt, te) {
      return (255 & tt[te]) << 24 | (255 & tt[te + 1]) << 16 | (255 & tt[te + 2]) << 8 | 255 & tt[te + 3]
    },
    Q = function (tt, te) {
      return (4294967295 & tt) << te | tt >>> 32 - te
    },
    G = function (tt) {
      var te = [
          ,
          ,
          ,
          ,
        ],
        tr = [
          ,
          ,
          ,
          ,
        ];
      i(tt, te, 0),
        tr[0] = h.zb[255 & te[0]],
        tr[1] = h.zb[255 & te[1]],
        tr[2] = h.zb[255 & te[2]],
        tr[3] = h.zb[255 & te[3]];
      var ti = B(tr, 0);
      return ti ^ Q(ti, 2) ^ Q(ti, 10) ^ Q(ti, 18) ^ Q(ti, 24)
    },
    l = function () {
      this.C = [
        0,
        0,
        0,
        0
      ],
        this.s = 0,
        this.t = [],
        this.S = [],
        this.h = [],
        this.i = [],
        this.B = [],
        this.Q = !1,
        this.G = [],
        this.D = [],
        this.w = 1024,
        this.g = null,
        this.a = Date.now(),
        this.e = 0,
        this.T = 255,
        this.V = null,
        this.U = Date.now,
        this.M = Array(32)
    };

  // function t(e) {
  //   return (t = 'function' == typeof Symbol && 'symbol' == typeof Symbol.A ? function(e) {
  //         return typeof e;
  //       }
  //       : function(e) {
  //         return e && 'function' == typeof Symbol && e.constructor === Symbol && e !== Symbol.prototype ? 'symbol' : typeof e;
  //       }
  //   )(e);
  // }

  function o(tt) {
    return (
      o = 'function' == typeof Symbol &&
      'symbol' == typeof Symbol.A ? function (tt) {
          return void 0 === tt ? 'undefined' : typeof tt
        }
        : function (tt) {
          return tt &&
          'function' == typeof Symbol &&
          tt.constructor === Symbol &&
          tt !== Symbol.prototype ? 'symbol' : void 0 === tt ? 'undefined' : typeof tt
        }
    ) (tt)
  }

  var
    h,
    A = '3.0',
    S = 'undefined' != typeof window ? window : {
    },
    __g = {
      x: function (tt, te) {
        for (var tr = [], ti = tt.length, ta = 0; 0 < ti; ti -= 16) {
          for (var tu = tt.slice(16 * ta, 16 * (ta + 1)), tc = Array(16), tf = 0; tf < 16; tf++) tc[tf] = tu[tf] ^ te[tf];
          te = __g.r(tc),
            tr = tr.concat(te),
            ta++
        }
        return tr
      },
      r: function (tt) {
        var te = Array(16),
          tr = Array(36);
        tr[0] = B(tt, 0),
          tr[1] = B(tt, 4),
          tr[2] = B(tt, 8),
          tr[3] = B(tt, 12);
        for (var ti = 0; ti < 32; ti++) {
          var ta = G(tr[ti + 1] ^ tr[ti + 2] ^ tr[ti + 3] ^ h.zk[ti]);
          tr[ti + 4] = tr[ti] ^ ta
        }
        return i(tr[35], te, 0),
          i(tr[34], te, 4),
          i(tr[33], te, 8),
          i(tr[32], te, 12),
          te
      }
    };
  l.prototype.O = function (A, C, s) {
    for (var t, S, h, i, B, Q, G, D, w, g, a, e, E, T, r, V, U, M, O, c, I; this.T < this.w; ) try {
      switch (this.T) {
        case 27:
          this.C[this.c] = this.C[this.I] >> this.C[this.F],
            this.M[12] = 35,
            this.T = this.T * (this.C.length + (this.M[13] ? 3 : 9)) + 1;
          break;
        case 34:
          this.C[this.c] = this.C[this.I] & this.C[this.F],
            this.T = this.T * (this.M[15] - 6) + 12;
          break;
        case 41:
          this.C[this.c] = this.C[this.I] <= this.C[this.F],
            this.T = 8 * this.T + 27;
          break;
        case 48:
          this.C[this.c] = !this.C[this.I],
            this.T = 7 * this.T + 16;
          break;
        case 50:
          this.C[this.c] = this.C[this.I] | this.C[this.F],
            this.T = 6 * this.T + 52;
          break;
        case 57:
          this.C[this.c] = this.C[this.I] >>> this.C[this.F],
            this.T = 7 * this.T - 47;
          break;
        case 64:
          this.C[this.c] = this.C[this.I] << this.C[this.F],
            this.T = 5 * this.T + 32;
          break;
        case 71:
          this.C[this.c] = this.C[this.I] ^ this.C[this.F],
            this.T = 6 * this.T - 74;
          break;
        case 78:
          this.C[this.c] = this.C[this.I] & this.C[this.F],
            this.T = 4 * this.T + 40;
          break;
        case 80:
          this.C[this.c] = this.C[this.I] < this.C[this.F],
            this.T = 5 * this.T - 48;
          break;
        case 87:
          this.C[this.c] = - this.C[this.I],
            this.T = 3 * this.T + 91;
          break;
        case 94:
          this.C[this.c] = this.C[this.I] > this.C[this.F],
            this.T = 4 * this.T - 24;
          break;
        case 101:
          this.C[this.c] = this.C[this.I] in this.C[this.F],
            this.T = 3 * this.T + 49;
          break;
        case 108:
          this.C[this.c] = o(this.C[this.I]),
            this.T = 2 * this.T + 136;
          break;
        case 110:
          this.C[this.c] = this.C[this.I] !== this.C[this.F],
            this.T += 242;
          break;
        case 117:
          this.C[this.c] = this.C[this.I] &&
            this.C[this.F],
            this.T = 3 * this.T + 1;
          break;
        case 124:
          this.C[this.c] = this.C[this.I] ||
            this.C[this.F],
            this.T += 228;
          break;
        case 131:
          this.C[this.c] = this.C[this.I] >= this.C[this.F],
            this.T = 3 * this.T - 41;
          break;
        case 138:
          this.C[this.c] = this.C[this.I] == this.C[this.F],
            this.T = 2 * this.T + 76;
          break;
        case 140:
          this.C[this.c] = this.C[this.I] % this.C[this.F],
            this.T += 212;
          break;
        case 147:
          this.C[this.c] = this.C[this.I] / this.C[this.F],
            this.T += 205;
          break;
        case 154:
          this.C[this.c] = this.C[this.I] * this.C[this.F],
            this.T += 198;
          break;
        case 161:
          this.C[this.c] = this.C[this.I] - this.C[this.F],
            this.T += 191;
          break;
        case 168:
          this.C[this.c] = this.C[this.I] + this.C[this.F],
            this.T = 2 * this.T + 16;
          break;
        case 254:
          this.C[this.c] = eval(i),
            this.T += 20 < this.M[11] ? 98 : 89;
          break;
        case 255:
          this.s = C ||
            0,
            this.M[26] = 52,
            this.T += this.M[13] ? 8 : 6;
          break;
        case 258:
          g = {};
          for (var F = 0; F < this.k; F++) e = this.i.pop(),
            a = this.i.pop(),
            g[a] = e;
          this.C[this.W] = g,
            this.T += 94;
          break;
        case 261:
          this.D = s ||
            [],
            this.M[11] = 68,
            this.T += this.M[26] ? 3 : 5;
          break;
        case 264:
          this.M[15] = 16,
            this.T = 'string' == typeof A ? 331 : 336;
          break;
        case 266:
          this.C[this.I][i] = this.i.pop(),
            this.T += 86;
          break;
        case 278:
          this.C[this.c] = this.C[this.I][i],
            this.T += this.M[22] ? 63 : 74;
          break;
        case 283:
          this.C[this.c] = eval(String.fromCharCode(this.C[this.I]));
          break;
        case 300:
          S = this.U(),
            this.M[0] = 66,
            this.T += this.M[11];
          break;
        case 331:
          D = atob(A),
            w = D.charCodeAt(0) << 16 | D.charCodeAt(1) << 8 | D.charCodeAt(2);
          for (var k = 3; k < w + 3; k += 3) this.G.push(D.charCodeAt(k) << 16 | D.charCodeAt(k + 1) << 8 | D.charCodeAt(k + 2));
          for (V = w + 3; V < D.length; ) E = D.charCodeAt(V) << 8 | D.charCodeAt(V + 1),
            T = D.slice(V + 2, V + 2 + E),
            this.D.push(T),
            V += E + 2;
          this.M[21] = 8,
            this.T += 1000 < V ? 21 : 35;
          break;
        case 336:
          this.G = A,
            this.D = s,
            this.M[18] = 134,
            this.T += this.M[15];
          break;
        case 344:
          this.T = 3 * this.T - 8;
          break;
        case 350:
          U = 66,
            M = [],
            I = this.D[this.k];
          for (var W = 0; W < I.length; W++) M.push(String.fromCharCode(24 ^ I.charCodeAt(W) ^ U)),
            U = 24 ^ I.charCodeAt(W) ^ U;
          r = parseInt(M.join('').split('|') [1]),
            this.C[this.W] = this.i.slice(this.i.length - r),
            this.i = this.i.slice(0, this.i.length - r),
            this.T += 2;
          break;
        case 352:
          this.e = this.G[this.s++],
            this.T -= this.M[26];
          break;
        case 360:
          this.a = S,
            this.T += this.M[0];
          break;
        case 368:
          this.T -= 500 < S - this.a ? 24 : 8;
          break;
        case 380:
          this.i.push(16383 & this.e),
            this.T -= 28;
          break;
        case 400:
          this.i.push(this.S[16383 & this.e]),
            this.T -= 48;
          break;
        case 408:
          this.T -= 64;
          break;
        case 413:
          this.C[this.e >> 15 & 7] = (this.e >> 18 & 1) == 0 ? 32767 & this.e : this.S[32767 & this.e],
            this.T -= 61;
          break;
        case 418:
          this.S[65535 & this.e] = this.C[this.e >> 16 & 7],
            this.T -= this.e >> 16 < 20 ? 66 : 80;
          break;
        case 423:
          this.c = this.e >> 16 & 7,
            this.I = this.e >> 13 & 7,
            this.F = this.e >> 10 & 7,
            this.J = 1023 & this.e,
            this.T -= 255 + 6 * this.J + this.J % 5;
          break;
        case 426:
          this.T += 5 * (this.e >> 19) - 18;
          break;
        case 428:
          this.W = this.e >> 16 & 7,
            this.k = 65535 & this.e,
            this.t.push(this.s),
            this.h.push(this.S),
            this.s = this.C[this.W],
            this.S = [];
          for (var J = 0; J < this.k; J++) this.S.unshift(this.i.pop());
          this.B.push(this.i),
            this.i = [],
            this.T -= 76;
          break;
        case 433:
          this.s = this.t.pop(),
            this.S = this.h.pop(),
            this.i = this.B.pop(),
            this.T -= 81;
          break;
        case 438:
          this.Q = this.C[this.e >> 16 & 7],
            this.T -= 86;
          break;
        case 440:
          U = 66,
            M = [],
            I = this.D[16383 & this.e];
          for (var b = 0; b < I.length; b++) M.push(String.fromCharCode(24 ^ I.charCodeAt(b) ^ U)),
            U = 24 ^ I.charCodeAt(b) ^ U;
          M = M.join('').split('|'),
            O = parseInt(M.shift()),
            this.i.push(
              0 === O ? M.join('|') : 1 === O ? - 1 !== M.join().indexOf('.') ? parseInt(M.join()) : parseFloat(M.join()) : 2 === O ? eval(M.join()) : 3 === O ? null : void 0
            ),
            this.T -= 88;
          break;
        case 443:
          this.b = this.e >> 2 & 65535,
            this.J = 3 & this.e,
            0 === this.J ? this.s = this.b : 1 === this.J ? this.Q &&
              (this.s = this.b) : 2 === this.J &&
              this.Q ||
              (this.s = this.b),
            this.g = null,
            this.T -= 91;
          break;
        case 445:
          this.i.push(this.C[this.e >> 14 & 7]),
            this.T -= 93;
          break;
        case 448:
          this.W = this.e >> 16 & 7,
            this.k = this.e >> 2 & 4095,
            this.J = 3 & this.e,
            Q = 1 === this.J &&
              this.i.pop(),
            G = this.i.slice(this.i.length - this.k, this.i.length),
            this.i = this.i.slice(0, this.i.length - this.k),
            c = 2 < G.length ? 3 : G.length,
            this.T += 6 * this.J + 1 + 10 * c;
          break;
        case 449:
          this.C[3] = this.C[this.W](),
            this.T -= 97 - G.length;
          break;
        case 455:
          this.C[3] = this.C[this.W][Q](),
            this.T -= 103 + G.length;
          break;
        case 453:
          B = this.e >> 17 & 3,
            this.T = 0 === B ? 445 : 1 === B ? 380 : 2 === B ? 400 : 440;
          break;
        case 458:
          this.J = this.e >> 17 & 3,
            this.c = this.e >> 14 & 7,
            this.I = this.e >> 11 & 7,
            i = this.i.pop(),
            this.T -= 12 * this.J + 180;
          break;
        case 459:
          this.C[3] = this.C[this.W](G[0]),
            this.T -= 100 + 7 * G.length;
          break;
        case 461:
          this.C[3] = new this.C[this.W],
            this.T -= 109 - G.length;
          break;
        case 463:
          U = 66,
            M = [],
            I = this.D[65535 & this.e];
          for (var n = 0; n < I.length; n++) M.push(String.fromCharCode(24 ^ I.charCodeAt(n) ^ U)),
            U = 24 ^ I.charCodeAt(n) ^ U;
          M = M.join('').split('|'),
            O = parseInt(M.shift()),
            this.T += 10 * O + 3;
          break;
        case 465:
          this.C[3] = this.C[this.W][Q](G[0]),
            this.T -= 13 * G.length + 100;
          break;
        case 466:
          this.C[this.e >> 16 & 7] = M.join('|'),
            this.T -= 114 * M.length;
          break;
        case 468:
          this.g = 65535 & this.e,
            this.T -= 116;
          break;
        case 469:
          this.C[3] = this.C[this.W](G[0], G[1]),
            this.T -= 119 - G.length;
          break;
        case 471:
          this.C[3] = new this.C[this.W](G[0]),
            this.T -= 118 + G.length;
          break;
        case 473:
          throw this.C[this.e >> 16 & 7];
        case 475:
          this.C[3] = this.C[this.W][Q](G[0], G[1]),
            this.T -= 123;
          break;
        case 476:
          this.C[this.e >> 16 & 7] = - 1 !== M.join().indexOf('.') ? parseInt(M.join()) : parseFloat(M.join()),
            this.T -= this.M[21] < 10 ? 124 : 126;
          break;
        case 478:
          t = [
            0
          ].concat(x(this.S)),
            this.V = 65535 & this.e,
            h = this,
            this.C[3] = function (tt) {
              var te = new l;
              return te.S = t,
                te.S[0] = tt,
                te.O(h.G, h.V, h.D),
                te.C[3]
            },
            this.T -= 50 < this.M[3] ? 120 : 126;
          break;
        case 479:
          this.C[3] = this.C[this.W].apply(null, G),
            this.M[3] = 168,
            this.T -= this.M[9] ? 127 : 128;
          break;
        case 481:
          this.C[3] = new this.C[this.W](G[0], G[1]),
            this.T -= 10 * G.length + 109;
          break;
        case 483:
          this.J = this.e >> 15 & 15,
            this.W = this.e >> 12 & 7,
            this.k = 4095 & this.e,
            this.T = 0 === this.J ? 258 : 350;
          break;
        case 485:
          this.C[3] = this.C[this.W][Q].apply(null, G),
            this.T -= this.M[15] % 2 == 1 ? 143 : 133;
          break;
        case 486:
          this.C[this.e >> 16 & 7] = eval(M.join()),
            this.T -= this.M[18];
          break;
        case 491:
          this.C[3] = new this.C[this.W].apply(null, G),
            this.T -= this.M[8] / this.M[1] < 10 ? 139 : 130;
          break;
        case 496:
          this.C[this.e >> 16 & 7] = null,
            this.T -= 10 < this.M[5] - this.M[3] ? 160 : 144;
          break;
        case 506:
          this.C[this.e >> 16 & 7] = void 0,
            this.T -= this.M[18] % this.M[12] == 1 ? 154 : 145;
          break;
        default:
          this.T = this.w
      }
    } catch (A) {
      this.g &&
      (this.s = this.g),
        this.T -= 114
    }
  },
  'undefined' != typeof window &&
  (
    S.__ZH__ = S.__ZH__ ||
      {
      },
      h = S.__ZH__.zse = S.__ZH__.zse ||
        {
        },
      (new l).O(
        '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'
      )
  );
  var D = function (tt) {
    return __g._encrypt(encodeURIComponent(tt))
  };


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    原来这个_encrypt()函数是封装到上面那串长长的字符串里的。把一段encode过的代码做base64解码，再用eval()作用一下，就能现出原形。

    参考文献

    目前来说有以下三个参数：x-zst-81，x-zse-93，x-zse-96，其中81参数主要是在用户使用浏览器或selenium模拟滑动时才会出现的，而如果直接请求接口则不需要输入这个参数。93这个参数是相对固定的，应该是一个类似于版本信息的东西，所以主要就是x-zse-96这个参数，这个参数通过全局搜索，在js里找到了这样一段代码

    try {
var g = z()
, y = function(e, t, n) {
var r = n.zse93
, i = n.dc0
, o = n.xZst81
, c = U(e)
, u = M(t)
, s = [r, c, i, B(u) && u, o].filter(Boolean).join("+");
return {
source: s,
signature: a()(l()(s))
}
}(t, u.body, {
zse93: b,
dc0: g,
xZst81: v
})
, E = y.signature;
O = y.source,
v && h.set("x-zst-81", v),
h.set("x-zse-93", b),
h.set("x-zse-96", "2.0_" + E)

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    其中可看出96这个参数主要是来自于signature: a()(l()(s))这个变量，而这个变量所使用的函数一共有两个，第一个是l()(s)，这个函数本身是一个md5加密，而参数s经输出后发现是x-zse-93+api_url+cookie[“d_c0”]三者相加，然后就是最重要的a()函数了，这个函数我通过chrome的js单步调试，找到了一个函数转发器：

    o.n = function(e) {
var t = e && e.__esModule ? function() {
return e.default
}
: function() {
return e
}
;
return o.d(t, "a", t),
t
}

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    然后通过传入的参数e，找到了该转发器在转发a()函数时调用的e函数所对应的真实函数：
    spider_collection/zhihuAnswerSpider/spider/g_encrypt.js

    Lines 445 to 447 in 2a58ec2

 var b = function (e) { 
     return __g._encrypt(encodeURIComponent(e)) 
 }; 

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    然后通过上述函数中的__g的声明位置找到了加密函数所对应的完整的大function，并将该function作为js代码作为js文件复制进自己代码中，并使用jsdom这个库【主要作用就是创建一下虚拟的dom文件和窗口配合函数调用】配合execjs这个库【真正调用js代码的python库】成功运行。此时我只需要在python代码中将x-zse-93，api_url，cookie[“d_c0”]三者进行拼串，同时调用md5加密得到基础的加密信息，然后将这个加密信息放到js文件中的b函数中即可完成最终加密。
    值得一提的是，其中cookie[“d_c0”]这个属性，其实很奇妙，用户不用登陆的时候如果通过question直接检索到相应的问答也可以直接浏览，此时查看cookie就会发现d_c0这个属性依然存在，所以本质上来说，知乎是不用登陆即可爬取的，这也就意味着不用建立相应的cookie池【因为并没有标识单个用户的用户特征用在了这次加密中】。

    最后就是，此次js逆向是我第一次做相对复杂的js逆向，所以在网络上参考了很多前辈们的工作，这里尤其感谢csdn的一位大佬，

    参考链接

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  • 原文地址：https://blog.csdn.net/jgku/article/details/133936200