Set cookie expiration to automatically update and automatically obtain

This time I will introduce to you the settings for automatic update and automatic acquisition of cookie expiration. What are the precautions for setting automatic update and automatic acquisition of cookie expiration? The following is a practical case, let's take a look.

This article implements automatic acquisition of cookies and automatic update of cookies when they expire.

A lot of information on social networking sites requires logging in to get it. Take Weibo as an example. Without logging in, you can only see the top ten Weibo posts of big Vs. To stay logged in, cookies are required. Take logging in to www.weibo.cn as an example:

Enter in chrome: http://login.weibo.cn/login/

Analysis Control When the header request from the station is returned, you will see several sets of cookies returned by weibo.cn.

Implementation steps:

1, use selenium to automatically log in to obtain cookies, save them to a file;

2, read cookie, compare the validity period of the cookie, and if it expires, perform step 1 again;

3, when requesting other web pages, fill in the cookie to maintain the login status.

1, Get cookies online

Use selenium + PhantomJS to simulate browser login and obtain cookies;

There are usually multiple cookies, and the cookies are stored one by one in .weibo suffix file.

def get_cookie_from_network():
 from selenium import webdriver
 url_login = 'http://login.weibo.cn/login/' 
 driver = webdriver.PhantomJS()
 driver.get(url_login)
 driver.find_element_by_xpath('//input[@type="text"]').send_keys('your_weibo_accout') # 改成你的微博账号
 driver.find_element_by_xpath('//input[@type="password"]').send_keys('your_weibo_password') # 改成你的微博密码
 driver.find_element_by_xpath('//input[@type="submit"]').click() # 点击登录
 # 获得 cookie信息
 cookie_list = driver.get_cookies()
 print cookie_list
 cookie_dict = {}
 for cookie in cookie_list:
  #写入文件
  f = open(cookie['name']+'.weibo','w')
  pickle.dump(cookie, f)
  f.close()
  if cookie.has_key('name') and cookie.has_key('value'):
   cookie_dict[cookie['name']] = cookie['value']
 return cookie_dict

2, get cookies from files

Traverse files ending with .weibo, that is, cookie files, from the current directory. Use pickle to unpack it into a dict, compare the expiry value with the current time, and return empty if it expires;

def get_cookie_from_cache():
 cookie_dict = {}
 for parent, dirnames, filenames in os.walk('./'):
  for filename in filenames:
   if filename.endswith('.weibo'):
    print filename
    with open(self.dir_temp + filename, 'r') as f:
     d = pickle.load(f)
     if d.has_key('name') and d.has_key('value') and d.has_key('expiry'):
      expiry_date = int(d['expiry'])
      if expiry_date > (int)(time.time()):
       cookie_dict[d['name']] = d['value']
      else:
       return {}
 return cookie_dict

3, if the cached cookie expires, obtain the cookie from the network again

def get_cookie():
 cookie_dict = get_cookie_from_cache()
 if not cookie_dict:
  cookie_dict = get_cookie_from_network()
 return cookie_dict

4, Requesting other Weibo homepages with cookies

def get_weibo_list(self, user_id):
 import requests
 from bs4 import BeautifulSoup as bs
 cookdic = get_cookie()
 url = 'http://weibo.cn/stocknews88' 
 headers = {'User-Agent': 'Mozilla/5.0 (Windows NT 6.1) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/31.0.1650.57 Safari/537.36'}
 timeout = 5
 r = requests.get(url, headers=headers, cookies=cookdic,timeout=timeout)
 soup = bs(r.text, 'lxml')
 ...
 # 用BeautifulSoup 解析网页
 ...

I believe you have mastered the method after reading the case in this article. For more exciting information, please pay attention to other related articles on the PHP Chinese website!

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The above is the detailed content of Set cookie expiration to automatically update and automatically obtain. For more information, please follow other related articles on the PHP Chinese website!