大概的处理思路是,把webpack打包之后的vendor.jschunk.js都放到一个js文件里,这里是demo.js,然后把模块加载器代码给放到AST.js

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const fs = require('fs');
const parser = require("@babel/parser");
const traverse = require("@babel/traverse").default;
const types = require("@babel/types");
const generator = require("@babel/generator").default;

const jscode = fs.readFileSync("./demo.js", {
encoding: "utf-8"
});
let ast = parser.parse(jscode);

let xiaojianbang;
let getSign;
var window = global;
window.addEventListener = function(){
console.log('call window.addEventListener', arguments);
}
var navigator = {
userAgent: "Mozilla/5.0 (Linux; Android 6.0; Nexus 5 Build/MRA58N) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/116.0.0.0 Mobile Safari/537.36"
};

var location = {
"ancestorOrigins": {},
"href": "https://h5.henghuaxingyi.com/#/login?jumpUrl=%2F",
"origin": "https://h5.henghuaxingyi.com",
"protocol": "https:",
"host": "h5.henghuaxingyi.com",
"hostname": "h5.henghuaxingyi.com",
"port": "",
"pathname": "/",
"search": "",
"hash": "#/login?jumpUrl=%2F"
};
window.location = location;

var history = {
scrollRestoration: "manual",
state: {
back: null,
current: "/login?jumpUrl=%2F",
forward: null,
position: 1,
replaced: true,
scroll: {left: 0, top: 0}
}
};
window.history = history;
let finalCode;

var localStorage = {
getItem: function(a) { console.log('getItem: ', a) },
setItem: function(a) { console.log('setItem', a) },
}
window.localStorage = localStorage;

(function(e) {
function t(t) {
for (var a, o, i = t[0], l = t[1], s = t[2], d = 0, m = []; d < i.length; d++)
o = i[d],
Object.prototype.hasOwnProperty.call(c, o) && c[o] && m.push(c[o][0]),
c[o] = 0;
for (a in l)
Object.prototype.hasOwnProperty.call(l, a) && (e[a] = l[a]);
u && u(t);
while (m.length)
m.shift()();
return r.push.apply(r, s || []),
n()
}
function n() {
for (var e, t = 0; t < r.length; t++) {
for (var n = r[t], a = !0, o = 1; o < n.length; o++) {
var i = n[o];
0 !== c[i] && (a = !1)
}
a && (r.splice(t--, 1),
e = l(l.s = n[0]))
}
return e
}
var a = {}
, o = {
app: 0
}
, c = {
app: 0
}
, r = [];
function i(e) {
return l.p + "h5/1693537486556/js/" + ({}[e] || e) + ".js"
}
function l(t) {
console.log('moduleName: ', t);
if (a[t])
return a[t].exports;

if(!e[t]) {
traverse(ast, {
ObjectProperty(path) {
let key = path.node.key;
let value = path.node.value;
let moduleName;
if(types.isStringLiteral(key) || types.isNumericLiteral(key)) {
moduleName = key.value;
} else if(types.isIdentifier(key)) {
moduleName = key.name;
}
if(moduleName == t && types.isFunctionExpression(value)) {
let code = generator(value).code;
finalCode += "'" + t + "': " + code + ",";
eval('e[t] = ' + code);
}
}
});
}

var n = a[t] = {
i: t,
l: !1,
exports: {}
};
return e[t].call(n.exports, n, n.exports, l),
n.l = !0,
n.exports
}
xiaojianbang = l;
l.e = function(e) {
var t = []
, n = {
};
o[e] ? t.push(o[e]) : 0 !== o[e] && n[e] && t.push(o[e] = new Promise((function(t, n) {
for (var a = "h5/1693537486556/css/" + ({}[e] || e) + ".css", c = l.p + a, r = document.getElementsByTagName("link"), i = 0; i < r.length; i++) {
var s = r[i]
, d = s.getAttribute("data-href") || s.getAttribute("href");
if ("stylesheet" === s.rel && (d === a || d === c))
return t()
}
var m = document.getElementsByTagName("style");
for (i = 0; i < m.length; i++) {
s = m[i],
d = s.getAttribute("data-href");
if (d === a || d === c)
return t()
}
var u = document.createElement("link");
u.rel = "stylesheet",
u.type = "text/css",
u.onload = t,
u.onerror = function(t) {
var a = t && t.target && t.target.src || c
, r = new Error("Loading CSS chunk " + e + " failed.\n(" + a + ")");
r.code = "CSS_CHUNK_LOAD_FAILED",
r.request = a,
delete o[e],
u.parentNode.removeChild(u),
n(r)
}
,
u.href = c;
var b = document.getElementsByTagName("head")[0];
b.appendChild(u)
}
)).then((function() {
o[e] = 0
}
)));
var a = c[e];
if (0 !== a)
if (a)
t.push(a[2]);
else {
var r = new Promise((function(t, n) {
a = c[e] = [t, n]
}
));
t.push(a[2] = r);
var s, d = document.createElement("script");
d.charset = "utf-8",
d.timeout = 120,
l.nc && d.setAttribute("nonce", l.nc),
d.src = i(e);
var m = new Error;
s = function(t) {
d.onerror = d.onload = null,
clearTimeout(u);
var n = c[e];
if (0 !== n) {
if (n) {
var a = t && ("load" === t.type ? "missing" : t.type)
, o = t && t.target && t.target.src;
m.message = "Loading chunk " + e + " failed.\n(" + a + ": " + o + ")",
m.name = "ChunkLoadError",
m.type = a,
m.request = o,
n[1](m)
}
c[e] = void 0
}
}
;
var u = setTimeout((function() {
s({
type: "timeout",
target: d
})
}
), 12e4);
d.onerror = d.onload = s,
document.head.appendChild(d)
}
return Promise.all(t)
}
,
l.m = e,
l.c = a,
l.d = function(e, t, n) {
l.o(e, t) || Object.defineProperty(e, t, {
enumerable: !0,
get: n
})
}
,
l.r = function(e) {
"undefined" !== typeof Symbol && Symbol.toStringTag && Object.defineProperty(e, Symbol.toStringTag, {
value: "Module"
}),
Object.defineProperty(e, "__esModule", {
value: !0
})
}
,
l.t = function(e, t) {
if (1 & t && (e = l(e)),
8 & t)
return e;
if (4 & t && "object" === typeof e && e && e.__esModule)
return e;
var n = Object.create(null);
if (l.r(n),
Object.defineProperty(n, "default", {
enumerable: !0,
value: e
}),
2 & t && "string" != typeof e)
for (var a in e)
l.d(n, a, function(t) {
return e[t]
}
.bind(null, a));
return n
}
,
l.n = function(e) {
var t = e && e.__esModule ? function() {
return e["default"]
}
: function() {
return e
}
;
return l.d(t, "a", t),
t
}
,
l.o = function(e, t) {
return Object.prototype.hasOwnProperty.call(e, t)
}
,
l.p = "/",
l.oe = function(e) {
throw e
}
;
var s = window["webpackJsonp"] = window["webpackJsonp"] || []
, d = s.push.bind(s);
s.push = t,
s = s.slice();
for (var m = 0; m < s.length; m++)
t(s[m]);
var u = d;
r.push([0, "chunk-vendors"]),
n()
}
)({});

xiaojianbang('0c6d');

console.log(getSign({
"sign_appid": "h5_23514861",
"timestamp": 1694096310,
"nonce": "uiVNV1664588Yhvib"
}, '看你麻痹看'));

fs.writeFile('./demoNew.js', finalCode, (err)=>{});

上面的function l(t) 是加载器函数,需要定义一个全局变量,把加载器函数接收出来,t是模块名,最终是通过return e[t].call(n.exports, n, n.exports, l)对模块中的函数进行调用,e是加载器接收的参数

所以加载器接收的参数格式就应该是

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{
模块名:function (){...}
}

现在的处理逻辑如下

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function l(t) {
console.log('moduleName: ', t);
// 如果模块已经加载,直接返回
if (a[t])
return a[t].exports;
// 如果模块没有加载,遍历demo.js中的节点,获取模块名
// 需要注意的是遍历节点的时候,属性名有时候是字符串有时候是数值
if(!e[t]) {
traverse(ast, {
ObjectProperty(path) {
let key = path.node.key;
let value = path.node.value;
let moduleName;
if(types.isStringLiteral(key) || types.isNumericLiteral(key)) {
moduleName = key.value;
} else if(types.isIdentifier(key)) {
moduleName = key.name;
}
// 这里是==不是===,因为要类型匹配,有时候属性名是数值,而t是字符串
if(moduleName == t && types.isFunctionExpression(value)) {
let code = generator(value).code;
finalCode += "'" + t + "': " + code + ",";
// 直接执行e[t] = function()
// 这样后面在调用e[t].call的时候就不会报错了
eval('e[t] = ' + code);
}
}
});
}

最后通过finalCode把筛出来的代码写入到文件里,fs.writeFile('./demoNew.js', finalCode, (err)=>{});

后面要做的就是把demoNew.js里的对象复制到模块加载器的参数中,然后找到执行加密逻辑的模块,把里面的加密函数给传到全局变量中,这里是getSign

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"0c6d":
...
function k(e) {
let b = p(d, o);
return b["toLowerCase"]();
}
getSign = k;