百度翻译sign值获取

# coding=utf-8

import js2py
import requests
import re
session = requests.Session()
headers= {"User-Agent": "Mozilla/5.0 (Macintosh; Intel Mac OS X 10_13_4) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/66.0.3359.139 Safari/537.36"}
session.headers = headers
response = session.get("http://fanyi.baidu.com/")
gtk = re.findall(";window.gtk = ('.*?');",response.content.decode())[0]
word = "你好"

context = js2py.EvalJs()
js = r'''
function a(r) {
        if (Array.isArray(r)) {
            for (var o = 0, t = Array(r.length); o < r.length; o++)
                t[o] = r[o];
            return t
        }
        return Array.from(r)
    }
    function n(r, o) {
        for (var t = 0; t < o.length - 2; t += 3) {
            var a = o.charAt(t + 2);
            a = a >= "a" ? a.charCodeAt(0) - 87 : Number(a),
                a = "+" === o.charAt(t + 1) ? r >>> a : r << a,
                r = "+" === o.charAt(t) ? r + a & 4294967295 : r ^ a
        }
        return r
    }
    function e(r) {
        var o = r.match(/[\uD800-\uDBFF][\uDC00-\uDFFF]/g);
        if (null === o) {
            var t = r.length;
            t > 30 && (r = "" + r.substr(0, 10) + r.substr(Math.floor(t / 2) - 5, 10) + r.substr(-10, 10))
        } else {
            for (var e = r.split(/[\uD800-\uDBFF][\uDC00-\uDFFF]/), C = 0, h = e.length, f = []; h > C; C++)
                "" !== e[C] && f.push.apply(f, a(e[C].split(""))),
                C !== h - 1 && f.push(o[C]);
            var g = f.length;
            g > 30 && (r = f.slice(0, 10).join("") + f.slice(Math.floor(g / 2) - 5, Math.floor(g / 2) + 5).join("") + f.slice(-10).join(""))
        }
        var u = void 0
            , l = "" + String.fromCharCode(103) + String.fromCharCode(116) + String.fromCharCode(107);
        u = 'null !== i ? i : (i = window[l] || "") || ""';
        for (var d = u.split("."), m = Number(d[0]) || 0, s = Number(d[1]) || 0, S = [], c = 0, v = 0; v < r.length; v++) {
            var A = r.charCodeAt(v);
            128 > A ? S[c++] = A : (2048 > A ? S[c++] = A >> 6 | 192 : (55296 === (64512 & A) && v + 1 < r.length && 56320 === (64512 & r.charCodeAt(v + 1)) ? (A = 65536 + ((1023 & A) << 10) + (1023 & r.charCodeAt(++v)),
                S[c++] = A >> 18 | 240,
                S[c++] = A >> 12 & 63 | 128) : S[c++] = A >> 12 | 224,
                S[c++] = A >> 6 & 63 | 128),
                S[c++] = 63 & A | 128)
        }
        for (var p = m, F = "" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(97) + ("" + String.fromCharCode(94) + String.fromCharCode(43) + String.fromCharCode(54)), D = "" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(51) + ("" + String.fromCharCode(94) + String.fromCharCode(43) + String.fromCharCode(98)) + ("" + String.fromCharCode(43) + String.fromCharCode(45) + String.fromCharCode(102)), b = 0; b < S.length; b++)
            p += S[b],
                p = n(p, F);
        return p = n(p, D),
            p ^= s,
        0 > p && (p = (2147483647 & p) + 2147483648),
            p %= 1e6,
        p.toString() + "." + (p ^ m)
    }
'''
#js中添加一行gtk
js = js.replace('\'null !== i ? i : (i = window[l] || "") || ""\'',gtk)
print(js)
#执行js
context.execute(js)
#调用函数得到sign
sign = context.e(word)
print(sign) #232427.485594

# from: zh
# to: en
# query: 你好
# transtype: translang
# simple_means_flag: 3
# sign: *232427.485594*
# token: 7d7ebd2b6584d2ce094f7d64aa6d7f9f