有道翻译js加密破解

案例说明：有道翻译请求参数（salt, sign, ts）通过js加密，进行爬虫请求时首先应对加密的参数进行解密，用到的技术要点有：js2py， hashlib加密，requests发送请求等。

import requests
import json
import js2py
import hashlib

headers = {
    'User-Agent': 'Mozilla/5.0 (X11; Linux x86_64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/71.0.3578.80 Safari/537.36',
    'Referer': 'http://fanyi.youdao.com/',
    'Cookie': '[email protected]; JSESSIONID=aaaHjtzn46bgpeP_sscGw; OUTFOX_SEARCH_USER_ID_NCOO=163114792.03463468; ___rl__test__cookies=1546265145496'
}
url = 'http://fanyi.youdao.com/translate_o?smartresult=dict&smartresult=rule'

# 获取ts，salt值：利用js2py模块
context = js2py.EvalJs()
js_str = """r = "" + (new Date).getTime()
          , i = r + parseInt(10 * Math.random(), 10);"""
context.execute(js_str)
ts = context.r
salt = context.i

# 获取sign值：通过js代码转化为python代码
e = input('请输入你要翻译的文字：')
sign = hashlib.md5(("fanyideskweb" + e + salt + "p09@Bn{h02_BIEe]$P^nG").encode('utf-8')).hexdigest()

data = {
    'i': e,
    'from': 'AUTO',
    'to': 'AUTO',
    'smartresult': 'dict',
    'client': 'fanyideskweb',
    'salt': salt,
    'sign': sign,
    'ts': ts,
    'bv': 'cf00c5d5529caf67ddf1aef1f05d88e4',
    'doctype': 'json',
    'version': '2.1',
    'keyfrom': 'fanyi.web',
    'action': 'FY_BY_CLICKBUTTION',
    'typoResult': 'false'
}

resp = requests.post(url=url, headers=headers, data=data)
resp_dict = json.loads(resp.text)
ret = resp_dict['translateResult'][0][0]['tgt']
print(ret)