# 百度翻译爬虫
**今日目标**
百度翻译能够随意输入内容并进行翻译
思路：在JS文件里面找到sign对应的m(a)函数，再用pyexecjs模块在Python中是实现
```python
import requests
import re
import execjs
class BaiduTranslateSpider(object):
def __init__(self):
self.get_url = 'https://fanyi.baidu.com/?aldtype=16047'
self.headers = {
"accept": "text/html,application/xhtml+xml,application/xml;q=0.9,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3",
"accept-encoding": "gzip, deflate, br",
"accept-language": "zh-CN,zh;q=0.9",
"cache-control": "max-age=0",
"cookie": "BAIDUID=2619E4B40580C3B077FF47135A00E390:FG=1; PSTM=1561529240; BIDUPSID=6E51187F13540BD223A2CC75D5DAD043; BDORZ=B490B5EBF6F3CD402E515D22BCDA1598; locale=zh; to_lang_often=%5B%7B%22value%22%3A%22en%22%2C%22text%22%3A%22%u82F1%u8BED%22%7D%2C%7B%22value%22%3A%22zh%22%2C%22text%22%3A%22%u4E2D%u6587%22%7D%5D; REALTIME_TRANS_SWITCH=1; FANYI_WORD_SWITCH=1; HISTORY_SWITCH=1; SOUND_SPD_SWITCH=1; SOUND_PREFER_SWITCH=1; from_lang_often=%5B%7B%22value%22%3A%22zh%22%2C%22text%22%3A%22%u4E2D%u6587%22%7D%2C%7B%22value%22%3A%22en%22%2C%22text%22%3A%22%u82F1%u8BED%22%7D%5D; delPer=0; PSINO=1; td_cookie=18446744071276835184; H_PS_PSSID=1456_21115_29578_29518_28519_29098_29568_28837_29220_29588; Hm_lvt_64ecd82404c51e03dc91cb9e8c025574=1563954537,1564019919,1564022523,1564024494; Hm_lpvt_64ecd82404c51e03dc91cb9e8c025574=1564026816; yjs_js_security_passport=76d517a36b6cea24775539304d39f1d5b4a11c3d_1564026815_js",
"upgrade-insecure-requests": "1",
"user-agent": "Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/75.0.3770.100 Safari/537.36",
}
# 获取token
def get_token(self):
html = requests.get(
url = self.get_url,
headers = self.headers
).text
# 正则解析
pattern = re.compile("token: '(.*?)'",re.S)
token = pattern.findall(html)[0]
return token
# 获取sign
def get_sign(self,word):
with open('node.js','r') as f:
js_data = f.read()
execjs_obj = execjs.compile(js_data)
sign = execjs_obj.eval('e("{}")'.format(word))
return sign
# 获取翻译结果
def get_result(self,word,fro,to):
token = self.get_token()
sign = self.get_sign(word)
# 把formdata定义成字典
formdata = {
'from': fro,
'to': to,
'query': word,
'transtype': 'realtime',
'simple_means_flag': '3',
'sign': sign,
'token': token,
}
html_json = requests.post(
url = 'https://fanyi.baidu.com/v2transapi',
data = formdata,
headers = self.headers
).json()
result = html_json['trans_result']['data'][0]['dst']
return result
if __name__ == '__main__':
spider = BaiduTranslateSpider()
choice = input('1.翻译英语 2.翻译汉语 请选择(1/2):')
if choice == '1':
fro = 'en'
to = 'zh'
else:
fro = 'zh'
to = 'en'
word = input('请输入要翻译的单词:')
result = spider.get_result(word,fro,to)
print(result)
```
node.js代码
```
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] || "") || "";
var u = '320305.131321201'
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)
}
var i = null;
//t.exports = e
```
