异步爬取有道词典(入门js逆向)

 抓到post包，分析提交的表单

比较多组数据发现只有salt, lts, sign发生变化(说明页面js脚本对其加密) 下面要找到该脚本分析加密过程。因为js启动在点击“翻译”时， 说明事件与该button绑定，找到该元素用事件监听找到脚本

打开后发现有九千多行，但问题不大 , ctrl+f搜索指定文字去找变量,找变量要找到最后出现的位置，毕竟要倒退分析

 salt等值成了r对象的属性再去找r， r = v.generateSaltSign(n);去找v的该方法的定义

再去找r

 找到这个小崽子开始对它分析

var r = function(e) {
        var t = n.md5(navigator.appVersion)
          , r = "" + (new Date).getTime()//时间戳要注意格式
          , i = r + parseInt(10 * Math.random(), 10);//将parseInt(10 * Math.random(), 10)扔入控制台
        return {
            ts: r,
            bv: t,  //别忘了他是定值
            salt: i,
            sign: n.md5("fanyideskweb" + e + i + "Y2FYu%TNSbMCxc3t2u^XT")//md5加密hash处理一下
        }

 这在0到9中抽一个整形分析完了，扔代码。

import hashlib, js2py, aiohttp, asyncio, time, random


def generate_formdata(word):
    '''
        ts: r = "" + (new Date).getTime(),
        salt: i = r + parseInt(10 * Math.random(), 10),
        sign: n.md5("fanyideskweb" + e + i + "Y2FYu%TNSbMCxc3t2u^XT")  e是输入的文本
    '''
    ts = str(int(time.time() * 1000))
    salt = ts + str(random.randint(0, 9))
    temp = "fanyideskweb" + word + salt + "Y2FYu%TNSbMCxc3t2u^XT"
    md5 = hashlib.md5()
    md5.update(temp.encode())
    sign = md5.hexdigest()
    formdata = {
        "i": word,
        "from": "AUTO",
        "to": "AUTO",
        'smartresult': 'dict',
        'client': 'fanyideskweb',
        "salt": salt,
        "sign": sign,
        "lts": ts,
        "bv": "c795a332c678d5063a1ee5eb15253848",
        "doctype": "json",
        "version": "2.1",
        'keyfrom': "fanyi.web",
        'action': 'FY_BY_REALTlME'
    }
    return formdata

async def get_ans(data):
    url = 'https://fanyi.youdao.com/translate_o?smartresult=dict&smartresult=rule'
    headers = {
            "User - Agent": "Mozilla / 5.0(Windows NT 10.0;Win64;x64) AppleWebKit / 537.36(KHTML, likeGecko) Chrome / 95.0.4638.69Safari / 537.36",
            "Referer": "https: // fanyi.youdao.com /"
        }
    async with aiohttp.ClientSession as session:
        async with session.get(url=url, headers=headers, data=data) as resp:
            ans =  await resp.text()
            print(ans)

if __name__ == '__main__':
    words = ['dog', 'cat', 'snack', 'stack', 'mask']
    datas = map(generate_formdata, words)
    loop = asyncio.get_event_loop()
    for i in datas:
        loop.create_task(get_ans(i))
    loop.run_until_complete(get_ans(-1))