BeautifulSoup /请求解决方案

Question

我正在研究python网络抓取项目。我正在尝试从中获取数据的网站包含有关在印度销售的所有药品的信息。该网站要求用户登录后才能访问此信息。

我想访问此URL https://mims.com/india/browse/alphabet/a?cat=drug&tab=brand中的所有链接并将其存储在数组中。

这是我登录网站的代码

##################################### Method 1
import mechanize
import http.cookiejar as cookielib
from bs4 import BeautifulSoup
import html2text

br = mechanize.Browser()
cj = cookielib.LWPCookieJar()

br.set_cookiejar(cj)

br.set_handle_equiv(True)
br.set_handle_gzip(True)
br.set_handle_redirect(True)
br.set_handle_referer(True)
br.set_handle_robots(False)
br.set_handle_refresh(mechanize._http.HTTPRefreshProcessor(), max_time=1)

br.addheaders = [('User-agent', 'Chrome')]

br.open('https://sso.mims.com/Account/SignIn')

# View available forms
for f in br.forms():
    print(f)

br.select_form(nr=0)

# User credentials
br.form['EmailAddress'] = <USERNAME>
br.form['Password'] = <PASSWORD>

# Login
br.submit()
print(br.open('https://mims.com/india/browse/alphabet/a?cat=drug&tab=brand').read())

但是问题在于，提交凭据时，会弹出一个中间页面，其中包含以下信息。

You will be redirected to your destination shortly.

此页面提交了一个隐藏的表单，然后才显示所需的结束页面。我要访问结束页面。但是br.open('https://mims.com/india/browse/alphabet/a?cat=drug&tab=brand').read()访问中间页并打印结果。

如何等待中间页提交隐藏的表单，然后访问末页的内容？

Answer 1

我在下面发布了一个selenium解决方案，该解决方案有效，但是在对登录过程有了更多了解之后，可以仅使用BeautifulSoup和requests登录。请阅读代码注释。

BeautifulSoup /请求解决方案

import requests
from bs4 import BeautifulSoup

d = {
    "EmailAddress": "your@email.tld",
    "Password": "password",
    "RememberMe":   True,
    "SubscriberId": "",
    "LicenseNumber":    "",
    "CountryCode":  "SG"
}

req = requests.Session()

login_u = "https://sso.mims.com/"
html = req.post(login_u, data=d)

products_url = "https://mims.com/india/browse/alphabet/a?cat=drug"
html = req.get(products_url) # The cookies generated on the previous request will be use on this one automatically because we use Sessions

# Here's the tricky part. The site uses 2 intermediary "relogin" pages that (theoretically) are only available with JavaScript enabled, but we can bypass that, i.e.:

soup = BeautifulSoup(html.text, "html.parser")
form = soup.find('form', {"id": "openid_message"})
form_url = form['action'] # used on the next post request

inputs = form.find_all('input')
form_dict = {}
for input in inputs:
    if input.get('name'):
        form_dict[input.get('name')] = input.get('value')

form_dict['submit_button'] = "Continue"
relogin = req.post(form_url, data=form_dict)


soup = BeautifulSoup(relogin.text, "html.parser")
form = soup.find('form', {"id": "openid_message"})
form_url = form['action'] # used
inputs = form.find_all('input')
form_dict = {}
for input in inputs:
    if input.get('name'):
        form_dict[input.get('name')] = input.get('value')
products_a = req.post(form_url, data=form_dict)
print(products_a.text)

# You can now request any url normally because the necessary cookies are already present on the current Session()
products_url = "https://mims.com/india/browse/alphabet/c?cat=drug"
products_c = req.get(products_url)
print(products_c.text)

硒溶液

from selenium import webdriver
from selenium.webdriver.support import expected_conditions as EC
from selenium.webdriver.common.by import By
from selenium.webdriver.support.ui import WebDriverWait
from selenium.webdriver.common.keys import Keys
from time import sleep

driver = webdriver.Firefox()
wait = WebDriverWait(driver, 10)
driver.maximize_window()

driver.get("https://sso.mims.com/")
el = wait.until(EC.element_to_be_clickable((By.ID, "EmailAddress")))
el.send_keys("your@email.com")

el = wait.until(EC.element_to_be_clickable((By.ID, "Password")))
el.send_keys("password")

el = wait.until(EC.element_to_be_clickable((By.ID, "btnSubmit")))
el.click()

wait.until(EC.element_to_be_clickable((By.CLASS_NAME, "profile-section-header"))) # we logged in successfully

driver.get("http://mims.com/india/browse/alphabet/a?cat=drug")
wait.until(EC.visibility_of_element_located((By.CLASS_NAME, "searchicon")))
print(driver.page_source)

# do what you need with the source code

如何从需要登录的网站上抓取信息

1 个答案:

BeautifulSoup /请求解决方案

硒溶液