[英]How to scrape a website that requires login first with Python
首先,我認為值得一提的是,我知道有很多類似的問題,但沒有一個對我有用......
我是 Python、html 和網絡爬蟲的新手。 我正在嘗試從需要先登錄的網站上抓取用戶信息。 在我的測試中,我使用從 github 抓取我的電子郵件設置作為示例。 主頁是“ https://github.com/login ”,目標頁面是“ https://github.com/settings/emails ”
這是我嘗試過的方法列表
##################################### Method 1
import mechanize
import cookielib
from BeautifulSoup import BeautifulSoup
import html2text
br = mechanize.Browser()
cj = cookielib.LWPCookieJar()
br.set_cookiejar(cj)
# Browser options
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')]
# The site we will navigate into, handling it's session
br.open('https://github.com/login')
for f in br.forms():
print f
br.select_form(nr=0)
# User credentials
br.form['login'] = 'myusername'
br.form['password'] = 'mypwd'
# Login
br.submit()
br.open('github.com/settings/emails').read()
################ Method 2
import urllib, urllib2, cookielib
username = 'myusername'
password = 'mypwd'
cj = cookielib.CookieJar()
opener = urllib2.build_opener(urllib2.HTTPCookieProcessor(cj))
login_data = urllib.urlencode({'username' : username, 'j_password' : password})
opener.open('https://github.com/login', login_data)
resp = opener.open('https://github.com/settings/emails')
print resp.read()
############# Method 3
import urllib
opener = urllib.FancyURLopener()
print opener.open('http://myusername:mypwd@github.com/settings/emails').read()
########## Method 4
import mechanize
import cookielib
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.set_debug_http(True)
#br.set_debug_redirects(True)
#br.set_debug_responses(True)
br.addheaders = [('User-agent', 'Chrome')]
br.add_password('https://github.com/settings/emails', 'myusername', 'mypwd')
br.open('https://github.com/settings/emails')
print br.response().read()
############ Methods 5
from requests import session
payload = {
'action': 'login',
'username': 'myusername',
'password': 'mypwd'
}
with session() as c:
c.post('https://github.com/login', data=payload)
request = c.get('https://github.com/settings/emails')
print request.headers
print request.text
########### Method 6
import requests
from requests.packages.urllib3 import add_stderr_logger
import sys
from bs4 import BeautifulSoup as bs
add_stderr_logger()
s = requests.Session()
s.headers['User-Agent'] = 'Chrome'
username = 'myusername'
password = 'mypwd'
url = 'https://github.com/login'
# after examining the HTML of the website you're trying to log into
# set name_form to the name of the form element that contains the name and
# set password_form to the name of the form element that will contain the password
login = {'login': username, 'password': password}
login_response = s.post(url, data=login)
for r in login_response.history:
if r.status_code == 401: # 401 means authentication failed
print 'error!'
sys.exit(1) # abort
pdf_response = s.get('https://github.com/settings/emails') # Your cookies and headers are automatically included
soup = bs(pdf_response.content)
我還閱讀了一些關於 HTTP 身份驗證和 cookie 之間差異的討論。 他們仍然沒有工作。
請幫助,任何幫助將不勝感激。 非常感謝。
這對我有用:
##################################### Method 1
import mechanize
import cookielib
from BeautifulSoup import BeautifulSoup
import html2text
# Browser
br = mechanize.Browser()
# Cookie Jar
cj = cookielib.LWPCookieJar()
br.set_cookiejar(cj)
# Browser options
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')]
# The site we will navigate into, handling it's session
br.open('https://github.com/login')
# View available forms
for f in br.forms():
print f
# Select the second (index one) form (the first form is a search query box)
br.select_form(nr=1)
# User credentials
br.form['login'] = 'mylogin'
br.form['password'] = 'mypass'
# Login
br.submit()
print(br.open('https://github.com/settings/emails').read())
你離得不遠了!
很想將我的解決方案添加到 . 這個答案主要遵循我在所做的一切中始終遵循的 hacky/lazy 方法。 繼續主要是因為,我懶得處理 cookie、會話數據等。
如果您想在使用單個帳戶憑據(例如您的所有 pinterest 板)登錄后抓取網站的多個頁面,則此解決方案最有用。 如果您想使用多個帳戶自動進行身份驗證,則不會
所以我的解決方案是 selenium 和 firefox 配置文件。
當我遇到需要抓取幾個 pinterest 頁面時,我設計了這種機制,我從示例中添加了幾行代碼,展示了如何使用配置文件。 根據您的需要調整代碼。
from selenium import webdriver
from selenium.webdriver.common.by import By
from selenium.webdriver.common.keys import Keys
from selenium.webdriver.support.ui import Select
from selenium.webdriver.support.ui import WebDriverWait
from selenium.common.exceptions import TimeoutException
from selenium.webdriver.support import expected_conditions as EC
from selenium.common.exceptions import NoSuchElementException
from selenium.common.exceptions import NoAlertPresentException
#replace with your firefox profile
fp=webdriver.FirefoxProfile('C:/Users/SJ/AppData/Roaming/Mozilla/Firefox/Profiles/hlsfrs2o.scrape')
#enter your url here
url=""
driver = webdriver.Firefox(fp)
driver.get(url)
html_source = driver.page_source
解決這個問題的經典方法是:
作為自動化的粉絲,我們認為我們可以編寫一些代碼來自動化第 2 點(這實際上是最耗時的),結果是登錄表單,這是一個根據登錄頁面、用戶名和密碼自動填寫登錄表單的庫。 這是一個簡單的蜘蛛的代碼,它將使用 loginform 自動登錄到站點。
github登錄spider.py
from scrapy.spider import BaseSpider
from scrapy.http import FormRequest
from scrapy.http.request import Request
from loginform import fill_login_form
from scrapy import log
from scraping.articles import ArticleItem
class GitHubLogin(BaseSpider):
name = 'GitHubLogin'
allowed_domains = ['github.com']
start_urls = ['http://github.com/login']
login_user = 'ranvijay5686'
login_pass = ''
def parse(self, response):
(args, url, method) = fill_login_form(response.url,
response.body, self.login_user, self.login_pass)
return FormRequest(url, method=method, formdata=args,
callback=self.after_login)
def after_login(self, response):
# for link in response.xpath("//*[@id='site-container']/div[2]/div[4]/p/a/@href").extract():
item = ArticleItem()
item['title'] = 'ranvijay'
log.msg('*************** : '
+ str(response.xpath("//form[@class='subnav-search left']/input/@value"
).extract()))
item['url'] = \
response.xpath("//*[@id='site-container']/div[1]/div/div/span/span/text()"
).extract()
yield item
項目.py
from scrapy.item import Item, Field
class ArticleItem(Item):
title = Field()
url = Field()
登錄表單.py
import sys
from argparse import ArgumentParser
from collections import defaultdict
from lxml import html
__version__ = '1.0' # also update setup.py
def _form_score(form):
score = 0
# In case of user/pass or user/pass/remember-me
if len(form.inputs.keys()) in (2, 3):
score += 10
typecount = defaultdict(int)
for x in form.inputs:
type_ = (x.type if isinstance(x, html.InputElement) else 'other'
)
typecount[type_] += 1
if typecount['text'] > 1:
score += 10
if not typecount['text']:
score -= 10
if typecount['password'] == 1:
score += 10
if not typecount['password']:
score -= 10
if typecount['checkbox'] > 1:
score -= 10
if typecount['radio']:
score -= 10
return score
def _pick_form(forms):
"""Return the form most likely to be a login form"""
return sorted(forms, key=_form_score, reverse=True)[0]
def _pick_fields(form):
"""Return the most likely field names for username and password"""
userfield = passfield = emailfield = None
for x in form.inputs:
if not isinstance(x, html.InputElement):
continue
type_ = x.type
if type_ == 'password' and passfield is None:
passfield = x.name
elif type_ == 'text' and userfield is None:
userfield = x.name
elif type_ == 'email' and emailfield is None:
emailfield = x.name
return (userfield or emailfield, passfield)
def submit_value(form):
"""Returns the value for the submit input, if any"""
for x in form.inputs:
if x.type == 'submit' and x.name:
return [(x.name, x.value)]
else:
return []
def fill_login_form(
url,
body,
username,
password,
):
doc = html.document_fromstring(body, base_url=url)
form = _pick_form(doc.xpath('//form'))
(userfield, passfield) = _pick_fields(form)
form.fields[userfield] = username
form.fields[passfield] = password
form_values = form.form_values() + submit_value(form)
return (form_values, form.action or form.base_url, form.method)
def main():
ap = ArgumentParser()
ap.add_argument('-u', '--username', default='username')
ap.add_argument('-p', '--password', default='secret')
ap.add_argument('url')
args = ap.parse_args()
try:
import requests
except ImportError:
print 'requests library is required to use loginform as a tool'
r = requests.get(args.url)
(values, action, method) = fill_login_form(args.url, r.text,
args.username, args.password)
print '''url: {0}
method: {1}
payload:'''.format(action, method)
for (k, v) in values:
print '- {0}: {1}'.format(k, v)
if __name__ == '__main__':
sys.exit(main())
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