ustclogin.py

from bs4 import BeautifulSoup
import requests
from io import BytesIO
import pytesseract
from PIL import Image
import numpy as np
import cv2
from urllib.parse import unquote
headers={'user-agent':'Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/99.0.4844.51 Safari/537.36'}
class Login:
    def __init__(self, stuid, password, service):
        self.stuid=stuid
        self.password=password
        self.service=service
        
    def get_LT(self):
        text=self.session.get('https://passport.ustc.edu.cn/validatecode.jsp?type=login',stream=True).content
        image=Image.open(BytesIO(text))
        image=cv2.cvtColor(np.asarray(image),cv2.COLOR_RGB2BGR)
        kernel = np.ones((3,3),np.uint8)
        image = cv2.dilate(image,kernel,iterations = 1)
        image = cv2.erode(image,kernel,iterations = 1)
        return pytesseract.image_to_string(Image.fromarray(image))[:4]
    
    def passport(self):
        data=self.session.get('https://passport.ustc.edu.cn/login?service='+self.service,headers=headers)
        data=data.text
        data = data.encode('ascii','ignore').decode('utf-8','ignore')
        soup = BeautifulSoup(data, 'html.parser')
        CAS_LT = soup.find("input", {"name": "CAS_LT"})['value']
        LT=self.get_LT()
        data = {
            'model': 'uplogin.jsp',
            'service': unquote(self.service),
            'warn': '',
            'showCode': '1',
            'username': self.stuid,
            'password': str(self.password),
            'button': '',
            'CAS_LT':CAS_LT,
            'LT':LT
        }
        self.result=self.session.post('https://passport.ustc.edu.cn/login', data=data,headers=headers)
        
    def login(self):
        self.session=requests.Session()
        loginsuccess = False
        retrycount = 5
        while (not loginsuccess) and retrycount:
            self.passport()
            self.cookies = self.session.cookies
            retrycount = retrycount - 1
            if self.result.url=='https://passport.ustc.edu.cn/login':
                print("Login Failed! Retry...")
            else:
                print("Login Successful!")
                loginsuccess = True
        return loginsuccess