execjs 调用

isNotNull = function (obj) {
    if (obj === undefined || obj === null || obj == "null" || obj === "" || obj == "undefined")
        return false;
    return true;
};

function getDecryptedParameters(__signature) {
    var sig = "";
    var chars = "0123456789abcdef";
    if (!isNotNull(__signature)) {
        var curTime = parseInt(Math.random() * (9999 - 1000 + 1) + 1000) + "" + Date.parse(new Date());
        sig = chars.charAt(parseInt(Math.random() * (15 - 15 + 1) + 10)) + chars.charAt(curTime.length) + "" + curTime;
    } else {
        sig = __signature;
    }

    var key = "";
    var keyIndex = -1;
    for (var i = 0; i < 6; i++) {
        var c = sig.charAt(keyIndex + 1);
        key += c;
        keyIndex = chars.indexOf(c);
        if (keyIndex < 0 || keyIndex >= sig.length) {
            keyIndex = i;
        }
    }

    var timestamp = parseInt(Math.random() * (9999 - 1000 + 1) + 1000) + "_" + key + "_" + Date.parse(new Date());
    var t = timestamp;
    //LEx.azdg.encrypt(timestamp,key);
    t = t.replace(/\+/g, "_");
    return {"s": sig, "t": t};
}

// 测试样例
// console.log(getDecryptedParameters("c988121626057020055"))

encrypt.js文件

目标文件http://zwfw.san-he.gov.cn/icity/icity/guestbook/interact

#!/usr/bin/env python3
# -*- coding: utf-8 -*-


import re

import execjs
import requests


index_url = 'http://zwfw.san-he.gov.cn/icity/icity/guestbook/interact'
data_url = 'http://zwfw.san-he.gov.cn/icity/api-v2/app.icity.guestbook.WriteCmd/getList'
headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/91.0.4472.124 Safari/537.36'}
session = requests.session()


def get_encrypted_parameters(signature):
    with open('encrypt.js', 'r', encoding='utf-8') as f:
        zwfw_san_he_js = f.read()
    encrypted_parameters = execjs.compile(zwfw_san_he_js).call('getDecryptedParameters', signature)
    return encrypted_parameters


def get_signature_and_cookies():
    response = session.get(url=index_url, headers=headers)
    cookies = response.cookies.get_dict()
    cookie = cookies['ICITYSession']
    signature = re.findall(r'signature = "(.*)"', response.text)[0]
    return cookie, signature


def get_data(cookie, parameters, page):
    payload_data = {'start': page*7, 'limit': 7, '[email protected]=': '2', '[email protected]=': '1'}
    params = {'s': parameters['s'], 't': parameters['t']}
    cookies = {'ICITYSession': cookie}
    response = session.post(url=data_url, headers=headers, json=payload_data, params=params, cookies=cookies).json()
    print(payload_data, response)


def main():
    ck, sig = get_signature_and_cookies()
    for page in range(10):
        # 采集10页数据
        param = get_encrypted_parameters(sig)
        get_data(ck, param, page)


if __name__ == '__main__':
    main()