[开发测试]百度翻译接口关键参数详解

1、查看请求链接

2、请求方法是post，看表单

多次请求对比，发现只有sign是动态的。

3、找sign的计算方法

发现了sign，打一个断点，翻译请求后，程序就会在该断点处拿到e的值（效果如下图所示）

原来是一个函数e(r)计算出了sign，找到e(r)

复制这串代码，自定义为fanyi.js，放在Python文件下，等待Python调用。

4、js代码

代码内容会和你目前粘贴的有出入，因为e(r)函数，缺少参数r的定义，需要继续找到并加入。除此以外，参数i也要加入。

完整js代码如下：

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 i = "320305.131321201"
    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)
}

5、请求、调用的代码

import requests
from fake_useragent import UserAgent
import execjs


class BaiduFanyi():
    def __init__(self, query):
        self.url = 'https://fanyi.baidu.com/v2transapi?from=zh&to=en'
        self.query = query
        self.headers = {
            'User-Agent': UserAgent(verify_ssl=False).random
        }
        self.cookies = {
            'BAIDUID_BFESS': '9254CAD7BD9966315CDDC6D2931CD05A:FG=1',
            'BAIDUID': '9254CAD7BD996631B92D894CD3A63CDF:FG=1',
            'RT': '"z=1&dm=baidu.com&si=uktj2p1d5o&ss=l10s06iu&sl=4&tt=2zx&bcn=https://fclog.baidu.com/log/weirwood?type=perf&ld=c6t&cl=awu&ul=7hjv&hd=7hlz"',
            'REALTIME_TRANS_SWITCH': '1',
            'FANYI_WORD_SWITCH': '1',
            'HISTORY_SWITCH': '1',
            'SOUND_SPD_SWITCH': '1',
            'SOUND_PREFER_SWITCH': '1',
            'APPGUIDE_10_0_2': '1',
            'Hm_lvt_64ecd82404c51e03dc91cb9e8c025574': '1648218223,1648262246',
            'Hm_lpvt_64ecd82404c51e03dc91cb9e8c025574': '1648278724',
            'ab_sr': '1.0.1_MDY5OWNlNmNmNjllNGIyNmEyN2MyYWQ4MDUyOGNhMjY1ZThkNzEyMWZjNWZiNjA3YWNhMjRhMjUwYmYwYmMwYjE0ZGI5OTY5Yjc3ODNhZDFkOTY3ODBiNGJlN2NiN2EyZjIyZGVjZGU5ZjgyMWI1ZDRjZmIwZDZmMDM2MDBjMjJiNjNiNWY4ZTFkNjg5ZTE1NWQ4ZWFkOTc3ZWU1YjhiZQ=='}
   
    def make_data(self):
        data = {
            'from': 'zh',
            'to': 'en',
            'query': self.query,
            'transtype': 'realtime',
            'simple_means_flag': '3',
            'sign': self.make_sign(),
            'token': '96d82a9f5a76b7954d06761f3f115609',
            'domain': 'common'
        }
        return data
            
    def make_sign(self):
        with open('D:/baidu_fanyi/fanyi.js', 'r', encoding='utf-8') as f:
            sign = execjs.compile(f.read()).call('e', self.query)
            return sign

    def get_content(self):
        response = requests.post(url=self.url, data=self.make_data(), headers=self.headers, cookies=self.cookies).json()
        translate = response['trans_result']['data'][0]['dst']
        print('translate:' + translate)

if __name__=='__main__':
    fanyi = BaiduFanyi('金融')
    fanyi.get_content()