Python Requests simulates login to realize automatic reservation of library seats

This article mainly introduces the simulated login of Python Requests in detail. Python realizes automatic reservation of library seats, which has certain reference value. Interested friends can refer to it.

The examples in this article are Everyone shared the specific code for automatic reservation of library seats in Python for your reference. The specific content is as follows

Configuration

Run the script regularly through the public network host and send it Send the email to your qq mailbox, so that there will be a message on WeChat to prompt whether the appointment is successful

vim /etc/crontab

Set up every morning at 7: 01 Run the script automatically

Program flow

(Take the yuyue.juneberry.cn website as an example)

• get Visit the login page, obtain the cookie and the hidden post field in the form

• Construct the login post data, and add the hidden post field obtained from the form

• Post the constructed data, simulate login, activate cookie (so that cookie has login permission)

• get access the seat reservation interface, activate cookie (so that cookie has permission to reserve seat)

• Post reservation request to realize seat reservation

• Analyze the return result, determine whether it is successful, and send an email reminder
  

Points

• ##requests.session() in the requests library Ability to create a session that can pass cookies

• Get the data of

  and pass it to the post data

• Capture the packet to determine the website logic, Filter out the parameters of each request and implement them in the program

  
  

Function explanation

• class FUCK()Main class

• _get_date_str(self):Get the current date and add one day, use this function to construct the characteristic field of the url ( The library sets up a seat reservation one day in advance)

• def _get_order_url(self):Construct the post target url of "reserve a seat"

• def _get_static_post_attr:This function parses the return page of the get request and extracts the field for subsequent construction of post data

• def login(self):Implement login function

• def run(self):Implementation Seat reservation function

• def _is_success(self, text):Judge the reservation result

• def error_log_once( self, text='default error (once)'):

• def error_log(self, text='default error'):These two The function sets the program status to "Error Already" or "No Error" (used to avoid writing repeated error messages to the log during automated running)

• def error_log( self, text='default error'):Write error information to the local log once

• sendmail.send_mail()Mail sending module
  

Code and comments

# /bin/python
# -*- coding:utf-8 -*-
import time
import sys
import requests
from bs4 import BeautifulSoup
from mail import sendmail

__author__ = 'xy'

# 主类
class FUCK():
 def __init__(self, username, password, seatNO, mailto):
 """
  以四个参数初始化，用户名，密码，要预约的座位号，接受预约结果提醒邮件的邮箱
 """
  self.username = username
  self.password = password
  self.seatNO = seatNO
  self.mailto = mailto
  self.base_url = 'http://yuyue.juneberry.cn'
  self.login_url = 'http://yuyue.juneberry.cn'
  self.order_url = self._get_order_url()

  self.login_content = ''
  self.middle_content = ''
  self.final_content = ''

  self.s = requests.session() # 创建可传递cookies的会话

  # post data for login
  self.data1 = {
   'subCmd': 'Login',
   'txt_LoginID': self.username, # S+学号
   'txt_Password': self.password, # 密码
   'selSchool': 60, # 60表示北京交通大学
  }

  # post data for order a seat
  self.data2 = {
   'subCmd': 'query',
  }

  # 自定义http头，然而我在程序里并没有使用
  self.headers = {
   'Connection': 'keep-alive',
   'Content-Type': 'application/x-www-form-urlencoded',
  }

  self.login()
  self.run()
  self._is_success(self.final_content)

  # 怀疑程序出错时，取消下行注释，可打印一些参数
  # self._debug()

 def _get_date_str(self):
  s = time.localtime(time.time())
  ########333
  date_str = str(s.tm_year) + '%2f' + str(s.tm_mon) + '%2f' + str(s.tm_mday + 1)
  date_str = date_str.replace('%2f1%2f32', '%2f2%2f1') \
   .replace('%2f2%2f29', '%2f3%2f1') \
   .replace('%2f3%2f32', '%2f4%2f1') \
   .replace('%2f4%2f31', '%2f5%2f1') \
   .replace('%2f5%2f32', '%2f6%2f1') \
   .replace('%2f6%2f31', '%2f7%2f1') \
   .replace('%2f7%2f32', '%2f8%2f1') \
   .replace('%2f8%2f32', '%2f9%2f1') \
   .replace('%2f9%2f31', '%2f10%2f1') \
   .replace('%2f10%2f32', '%2f11%2f1') \
   .replace('%2f11%2f31', '%2f12%2f1') \
   .replace('%2f12%2f32', '%2f1%2f1')
  return date_str

 def _get_order_url(self):
  return "http://yuyue.juneberry.cn/BookSeat/BookSeatMessage.aspx?seatNo=101001" + self.seatNO + "&seatShortNo=01" + self.seatNO + "&roomNo=101001&date=" + self._get_date_str()

 def _get_static_post_attr(self, page_content, data_dict):
  """
  拿到<input type=&#39;hidden&#39;>的post参数，并添加到post_data中
  """
  soup = BeautifulSoup(page_content, "html.parser")
  for each in soup.find_all(&#39;input&#39;):
   if &#39;value&#39; in each.attrs and &#39;name&#39; in each.attrs:
    data_dict[each[&#39;name&#39;]] = each[&#39;value&#39;] # 添加到login的post_data中
    # self.data2[each[&#39;name&#39;]] = each[&#39;value&#39;] # 添加到order的post_data中
  return data_dict

 def _debug(self):

  print self.order_url
  print self.data1
  print self.data2
  print self.headers
  print self.s.cookies

  # print self.login_content
  # print self.middle_content
  print self.final_content

 def login(self):
  homepage_content = self.s.get(self.base_url).content
  self.data1 = self._get_static_post_attr(homepage_content, self.data1)
  r = self.s.post(self.login_url, self.data1)
  self.login_content = r.content

 def run(self):

  # 这个get的意思是：原先的cookie没有预约权限，
  # 访问这个get之后，会使cookie拥有预约权限，从而执行下一个post
  self.middle_content = self.s.get(&#39;http://yuyue.juneberry.cn/BookSeat/BookSeatListForm.aspx&#39;).content

  # 经测试，这个post只需要一个subCmd的参数就可以正常返回，因此不必根据get内容更新post参数
  # self.data2 = self._get_static_post_attr(middle_content, self.data2)

  # 这个post请求完成了预约功能！
  r = self.s.post(self.order_url, self.data2)

  self.final_content = r.content

 def _is_success(self, text):
  """
  接受最终的html内容，判断是否成功，并触发日志记录和邮件提醒
  """
  if &#39;<h5 id="已经存在有效的预约记录">已经存在有效的预约记录。</h5>&#39; in text:
   self.clear_error_once(&#39;[done!] You already ordered a seat!&#39;)
  elif &#39;<h5 id="选择的日期不允许预约">选择的日期不允许预约。</h5>&#39; in text:
   self.clear_error_once(&#39;[done!] Date is wrong!&#39;)
  elif &#39;<h5 id="所选座位已经被预约">所选座位已经被预约。</h5>&#39; in text:
   self.clear_error_once(&#39;[done!] This seat is not available, maybe taken by others!&#39;)
  elif &#39;<h5 id="MessageTip">座位预约成功&#39; in text:
   self.clear_error_once(&#39;[done!] Success! An email is sending to you!&#39;)
   sendmail.send_mail(&#39;BJTU Library Seat_NO:&#39; + self.seatNO + &#39;ordered!&#39;,
        &#39;Sending by robot. Do not reply this mail!&#39;, self.mailto)
  else:
   self.error_log_once(&#39;Error! 302 to login page&#39;)

 def error_log_once(self, text=&#39;default error (once)&#39;):
  try:
   is_error_file = open(&#39;./isopen_xy.txt&#39;, &#39;r&#39;)
  except:
   is_error_file = open(&#39;./isopen_xy.txt&#39;, &#39;w&#39;)
  if &#39;1&#39; not in is_error_file.read():
   print &#39;writting error to log...&#39;
   self.error_log(text)
  else:
   print &#39;already written to log&#39;
  is_error_file.close()
  sendmail.send_mail(&#39;BJTU_Library system error once !&#39;, &#39;error text!&#39;)

 def error_log(self, text=&#39;default error&#39;):
  is_error_file = open(&#39;./isopen_xy.txt&#39;, &#39;w&#39;)
  is_error_file.write(&#39;1\n&#39;)
  is_error_file.close()

  f = open("./log_xy.txt", &#39;a&#39;)
  f.write(time.strftime("%Y-%m-%d %X", time.localtime()) + text + &#39;\n&#39;)
  f.close()

 def clear_error_once(self, text=&#39;success&#39;):
  print text
  is_error_file = open(&#39;./isopen_xy.txt&#39;, &#39;w&#39;)
  is_error_file.write(&#39;0\n&#39;)
  is_error_file.close()


if __name__ == &#39;__main__&#39;:
 if len(sys.argv) < 5:
  print &#39;Usage: python library.py [username] [password] [seat_NO] [email]&#39;
  print &#39;eg. python library.py S13280001 123456 003 XXXX@qq.com\n&#39;
  print &#39;Any problems, mail to: i[at]cdxy.me&#39;
  print &#39;#-*- Edit by cdxy 16.03.24 -*-&#39;
  sys.exit(0)
 else:
  FUCK(sys.argv[1], sys.argv[2], sys.argv[3], sys.argv[4])

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