Scrapy Login Authentication

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Scrapy Login Authentication



I am fairly new to scraping, and I have a page I would like to login to so that I can scrape.



From the Scrapy documentation, it appears we should use FormRequest. Here is the example that is given in the documentation:


import scrapy

class LoginSpider(scrapy.Spider):
name = 'example.com'
start_urls = ['http://www.example.com/users/login.php']

def parse(self, response):
return scrapy.FormRequest.from_response(
response,
formdata={'username': 'john', 'password': 'secret'},
callback=self.after_login
)

def after_login(self, response):
# check login succeed before going on
if "authentication failed" in response.body:
self.logger.error("Login failed")
return

# continue scraping with authenticated session...



However, this seems oversimplified in most cases. I have looked at other examples online where the login process requires tokens, etc.



I think I have identified the form I need to post in order to login to the site I am trying to scrape.


<form method="post" action="/" id="MainForm">
<div id="lgn-container" class="box sign-in">
<input type="hidden" name="__EVENTTARGET" id="__EVENTTARGET" value="" />
<input type="hidden" name="__EVENTARGUMENT" id="__EVENTARGUMENT" value="" />
<input type="hidden" id="hfLoginDsId" value="{1234567}" />



I'm wondering how I can edit the example code given in the documentation to reflect this particular scenario. I need to give a username and password, but I don't see how that fits in here!









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