python selenium 抓包之ajax-hook 优化

一般来说，用selenium是无法获取ajax请求内容的，不过最近了解到有个工具ajax-hook，通过hook浏览器xhr请求来获取抓包数据

目前方案有

1.ajax+flask

将ajaxhook到的数据发送到flask服务器上面，后期再去flask上面获取到请求数据

hook.js
//需要引入axios库发送请求，通过post到flask服务器将数据发送过去
ah.proxy({
  //请求成功后进入
  onResponse: (response, handler) => {
    if (response.config.url.startsWith('/api/movie')) {
      axios.post('http://localhost/receiver/movie', {
        url: window.location.href,
        data: response.response
      })
      console.log(response.response)
      handler.next(response)
    }
  }
})

　　

这种方法比较繁琐，需要编写flask服务器，启动的时候还需要开启服务，不是很方便

2.BrowserMob Proxy

具体可以参照:轻松截获 Selenium 中的 Ajax 数据

这个操作也不是很简单，window下需要手动启动bat服务，他是通过代理方式进行数据拦截获取，操作也是很繁琐

3.知乎上看到的，方法是增加保存函数，将抓取到的数据保存到本地json文件

allen：如何利用python+selenium+ajax-hook抓取网页后台返回的json数据

这种方法相对上面2中来说方便很多，也不需要另外开启服务，不过会产生很多json文件，需要进行读取，删除操作，也不是特别方便

这边介绍下一个新的方法

ajax-hook + console.log + selenium的获取日志

实现原理是：

1.将ajax-hook到的响应使用console.log打印出来

2.通过selenium获取日志可以获取到console.log打印的内容

这个方法其实是优化了方法3

具体实现代码参考如下

通过判断是否是json格式请求来过滤非ajax请求

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ah.proxy({
    //请求发起前进入
    onRequest: (config, handler) => {
        console.log(config.url)
        handler.next(config);
    },
    //请求发生错误时进入，比如超时；注意，不包括http状态码错误，如404仍然会认为请求成功
    onError: (err, handler) => {
        console.log(err.type)
        handler.next(err)
    },
    //请求成功后进入
    onResponse: (response, handler) => {
        //判断是否是json 
    	var obj=JSON.parse(response.response);
    	if(typeof obj == 'object' && obj ){
            console.log(response.response)
        }
        handler.next(response)
    }
})

　　抓包demo

from selenium import webdriver
from selenium.webdriver.common.desired_capabilities import DesiredCapabilities
import time

#设置日志
d = DesiredCapabilities.CHROME
d['goog:loggingPrefs'] = {'browser': 'ALL'}

# 启动浏览器
driver = webdriver.Chrome(executable_path='chromedriver.exe')

#设置cdp命令，每次加载页面都会执行改该js内容
driver.execute_cdp_cmd("Page.addScriptToEvaluateOnNewDocument", {"source": open('hook.js', encoding='utf-8').read()})


base_url = 'https://www.baidu.com/'

driver.get(base_url)

time.sleep(3)
print('第1次获取日志')
#获取日志
for entry in driver.get_log('browser'):
    print(entry)

print('第2次获取日志')
#再次获取日志
for entry in driver.get_log('browser'):
    print(entry)

driver.quit()

　　

通过cdp命令可以让selenium打开网页时先执行需要的js

通过get_log()来获取日志，获取完成后会清空之前的日志，如果没有新的请求，再次获取就没有内容了

第1次获取日志
{'level': 'INFO', 'message': 'https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/js/all_async_search_5727230.js 230:547 "每一个星球都有一个驱动核心，\n每一种思想都有影响力的种子。\n感受世界的温度，\n年轻的你也能成为改变世界的动力，\n百度珍惜你所有的潜力。\n你的潜力，是改变世界的动力！\n\n"', 'source': 'console-api', 'timestamp': 1630660866861}
{'level': 'INFO', 'message': 'https://ss1.bdstatic.com/5eN1bjq8AAUYm2zgoY3K/r/www/cache/static/protocol/https/global/js/all_async_search_5727230.js 230:654 "%c百度2022校园招聘简历投递：https://talent.baidu.com/external/baidu/campus.html" "color:red"', 'source': 'console-api', 'timestamp': 1630660866861}
{'level': 'INFO', 'message': 'console-api 7:16 "/sugrec?prod=pc_his&from=pc_web&json=1&sid=34496_34144_34004_34092_34518_26350_34416_34470&hisdata=&_t=1630660866982&req=2&csor=0"', 'source': 'console-api', 'timestamp': 1630660867014}
{'level': 'INFO', 'message': 'console-api 19:20 "{\"err_no\":0,\"errmsg\":\"\",\"queryid\":\"0x10f66cd03e7fc54\"}"', 'source': 'console-api', 'timestamp': 1630660867022}
第2次获取日志

　　

可以看到获取到了4条记录，有2条是百度自己的，下面2条是抓取到的数据

以上就是此新的方法了，唯一不足就是会抓取到其他日志，可以改变日志等级来过滤。

感谢方法3 allen提供的思路