python-js decompile first test

`预备知识`

Literacy - Reptile necessary: Python execute JS code - PyExecJS, PyV8, Js2Py
First test PyExecJS
But look, said PyV8no additional equipment JS environment, because the environment itself is a V8, but py3, some problems have time to learn about science. . . [ Here accounted pit, back up the link ]

Purpose is python 可以调试 js, ok, open out.

1、`PyExecJS 初试`

pip install PyExecJS

# a.js

function add(x, y) { return x + y; }

# learning00.py

import execjs
def function():
    print("in function...")
    environ = execjs.get().name # 查看调用的环境
    print(environ)

    ctx = execjs.compile(""" function add(x, y) { return x + y; } """)
    result = ctx.call("add", 3, 2)
    print('execjs.all', result)

    with open('./a.js', 'r') as f:
        ctx = execjs.compile(f.read())
        result = ctx.call("add", 1, 2)
        print('openFile and call', result)result)

When js contains windows, document, use the jsdomresolve to learn frompython使用execjs执行含有document、window等对象的js代码，使用jsdom解决

Other techniques [ js obfuscated code reduction ]

First posted test code after a confusion:

eval(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e(c);k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1;};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p;}('1("0－6");2 4(){1("0－5")}8 3=2(){1("0－7")};4();3()',9,9,'忧郁的匹格|alert|function|b|a|反混淆测试2|反混淆测试1|反混淆测试3|var'.split('|'),0,{}))

Anti-aliasing method

Create a new pagexxx.html
Adding a div containerid="divTest"
Assignment performed (in code obfuscation above, the contents of () extracted from the assignment eval (or direct printing))

<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <title>Title</title>
</head>
<body>
    <div id="divTest"></div>
</body>
</html>
<script>
// 将内容直接提取到页面中
    document.getElementById('divTest').innerText = function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e(c);k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1;};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p;}('1("0－6");2 4(){1("0－5")}8 3=2(){1("0－7")};4();3()',9,9,'忧郁的匹格|alert|function|b|a|反混淆测试2|反混淆测试1|反混淆测试3|var'.split('|'),0,{})
 
// 直接在控制台中打印出来
    console.log(function(p,a,c,k,e,d){e=function(c){return(c<a?"":e(parseInt(c/a)))+((c=c%a)>35?String.fromCharCode(c+29):c.toString(36))};if(!''.replace(/^/,String)){while(c--)d[e(c)]=k[c]||e(c);k=[function(e){return d[e]}];e=function(){return'\\w+'};c=1;};while(c--)if(k[c])p=p.replace(new RegExp('\\b'+e(c)+'\\b','g'),k[c]);return p;}('1("0－6");2 4(){1("0－5")}8 3=2(){1("0－7")};4();3()',9,9,'忧郁的匹格|alert|function|b|a|反混淆测试2|反混淆测试1|反混淆测试3|var'.split('|'),0,{}))
</script>

Open xxx.html shows the code after the results :( anti-aliasing has been compressed, remove the newline character, etc.), then on his own js code can be analyzed.

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