python3爬虫进阶JS逆向学习（十）
目的
目的：JS逆向的学习与交流
目标：分析抖音sign参数
目标网址：https://www.amemv.com/share/user/94508298369?sec_uid=MS4wLjABAAAAlCk0D9y9kFybWrD_06F-G7vrujt75VqTD25RImgRtyE
// 若有侵权，请联系作者删除，谢谢！
思路分析
一、内容概览
二、加密参数分析
三、js扣取
技术太菜，扣了一天，也没扣好，调试没通过............
发现了大佬两年前扣好的js，就直接拿来用了，现在测试仍可用
function Sign(uid) {global.navigator = {};global.navigator.userAgent = "Mozilla/5.0 (iPhone; CPU iPhone OS 11_0 like Mac OS X) AppleWebKit/604.1.38 (KHTML, like Gecko) Version/11.0 Mobile/15A372 Safari/604.1";var e,n,i = {},o = {},a = {},u = {},c = {},s = {},f = function (t, e, n) {var r = i[t] || (i[t] = []);r.push(e);var o,a = c[t] || c[t + ".js"] || {},u = a.pkg;o = u ? s[u].url || s[u].uri : a.url || a.uri || t};n = function (t, e) {"function" != typeof e && (e = arguments[2]),t = t.replace(/\.js$/i, ""),o[t] = e;var n = i[t];if (n) {for (var r = 0, a = n.length; a > r; r++)n[r]();delete i[t]}},e = function (t) {if (t && t.splice)return e.async.apply(this, arguments);t = e.alias(t);var n = a[t];if (n)return n.exports;var r = o[t];if (!r)throw "[ModJS] Cannot find module `" + t + "`";n = a[t] = {exports: {}};var i = "function" == typeof r ? r.apply(n, [e, n.exports, n]) : r;return i && (n.exports = i),n.exports && !n.exports["default"] && Object.defineProperty && Object.isExtensible(n.exports) && Object.defineProperty(n.exports, "default", {value: n.exports}),n.exports},e.async = function (n, r, i) {function a(t) {for (var n, r = 0, h = t.length; h > r; r++) {var p = e.alias(t[r]);p in o ? (n = c[p] || c[p + ".js"],n && "deps" in n && a(n.deps)) : p in s || (s[p] = !0,l++,f(p, u, i),n = c[p] || c[p + ".js"],n && "deps" in n && a(n.deps))}}function u() {if (0 === l--) {for (var i = [], o = 0, a = n.length; a > o; o++)i[o] = e(n[o]);r && r.apply(t, i)}}"string" == typeof n && (n = [n]);var s = {},l = 0;a(n),u()},e.alias = function (t) {return t.replace(/\.js$/i, "")}var require = e;var define = n;/*!douyin_falcon:node_modules/byted-acrawler/dist/runtime.js*/define("douyin_falcon:node_modules/byted-acrawler/dist/runtime", function(l, e) {Function(function(l) {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["$"+b]=s,t=0;t>>065:h=,y=,[y]=h66:u(e(t[b],,67:y=,d=,u((g=).x===c?r(g.y,y,k):g.apply(d,y68:u(e((g=t[b])<"<"?(b--,f):g+g,,70:u(!1)71:n72:+f73:u(parseInt(f,3675:if(){bcase 74:g=<<16>>16g76:u(k[])77:y=,u([y])78:g=,u(a(v,x-=g+1,g79:g=,u(k["$"+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})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(e) {return l[15 & e.charCodeAt(0)]})}("v[x++]=v[--x]t.charCodeAt(b++)-32function return ))++.substrvar .length(),b+=;break;case ;break}".split("")))()('gr$Daten Иb/s!l y͒yĹg,(lfi~ah`{mv,-n|jqewVxp{rvmmx,&effkx[!cs"l".Pq%widthl"@q&heightl"vr*getContextx$"2d[!cs#l#,*;?|u.|uc{uq$fontl#vr(fillTextx$$龘ฑภ경2<[#c}l#2q*shadowBlurl#1q-shadowOffsetXl#$$limeq+shadowColorl#vr#arcx88802[%c}l#vr&strokex[ c}l"v,)}eOmyoZB]mx[ cs!0s$l$Pb<k7l l!r&lengthb%^l$1+s$jl s#i$1ek1s$gr#tack4)zgr#tac$! +0o![#cj?o ]!l$b%s"o ]!l"l$b*b^0d#>>>s!0s%yA0s"l"l!r&lengthb&l!l Bd>&+l!l &+l!l 6d>&+l!l &+ s,y=o!o!]/q"13o!l q"10o!],l 2d>& s.{s-yMo!o!]0q"13o!]*Ld>>b|s!o!l q"10o!],l!& s/yIo!o!].q"13o!],o!]*Jd>>b|&o!]+l &+ s0l-l!&l-l!i\'1z141z4b/@d value: !0})])});var _bytedAcrawler = require("douyin_falcon:node_modules/byted-acrawler/dist/runtime");var signature = _bytedAcrawler.sign(uid);return signature;};console.log(Sign('94508298369'));四、sec_uid获取
五、注意
链接模板：https://www.amemv.com/share/user/94508298369?sec_uid=MS4wLjABAAAAlCk0D9y9kFybWrD_06F-G7vrujt75VqTD25RImgRtyE
1. 94508298369：sign生成时需要传入这个值，一般不需要动
2.sec_uid:目标主页的uid值，可以修改自己喜欢的短视频作者主页
3.基于此可以实现对作者主页信息的获取与短视频无水印下载
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