Scraping authenticated websites

Last Updated or created 2023-03-03

A friend needed to scrape data from an authenticated website.
This needs to be scripted and processed without human intervention.

Following steps are needed to get the correct curl commands (one time only)

Login page
Press F12 or right-click inspect
Click network and reload using ctrl-r
Select the start page and right click
copy as cURL (bash)

next steps

save curl command in a file

remove –compresssion and -H ‘Cookie: JSESSIONID=?????????????????????????????’

add just after curl

-k (no certificate check) and
–cookie-jar tmpcookiefile

excecute this. It will give you a file with a session id and a true field.
(This will change at every login)
but is needed for subsequential requests

Next: use this sessioncookie to get the next authenticated request

So to scrape with login, you need two lines in your script.
One to get the session cookie. (YOUR username/pass will be in here!!)
And the second to get the needed page using the cookie

#authenticate and save sessioncookie
curl -k --cookie-jar part1.cookie ''   -H 'Accept: text/html,application/xhtml+xml,application/xml;q=0.9,image/avif,image/webp,image/apng,*/*;q=0.8,application/signed-exchange;v=b3;q=0.7'   -H 'Accept-Language: en-GB,en;q=0.9,nl-NL;q=0.8,nl;q=0.7'   -H 'Cache-Control: max-age=0'   -H 'Connection: keep-alive'   -H 'Content-Type: multipart/form-data; boundary=----WebKitFormBoundaryb1chvkAVZSF3hPSu'    -H 'Origin:'   -H 'Referer:'   -H 'Sec-Fetch-Dest: document'   -H 'Sec-Fetch-Mode: navigate'   -H 'Sec-Fetch-Site: same-origin'   -H 'Upgrade-Insecure-Requests: 1'   -H 'User-Agent: Mozilla/5.0 (Windows NT 10.0; Win64; x64) AppleWebKit/537.36 (KHTML, like Gecko) Chrome/ Safari/537.36'   -H 'sec-ch-ua: "Chromium";v="110", "Not A(Brand";v="24", "Google Chrome";v="110"'   -H 'sec-ch-ua-mobile: ?0'   -H 'sec-ch-ua-platform: "Windows"'   --data-raw $'------WebKitFormBoundaryb1chvkAVZSF3hPSu\r\nContent-Disposition: form-data; name="form[username]"\r\n\r\nusername\r\n------WebKitFormBoundaryb1chvkAVZSF3hPSu\r\nContent-Disposition: form-data; name="form[password]"\r\n\r\npassword\r\n------WebKitFormBoundaryb1chvkAVZSF3hPSu\r\nContent-Disposition: form-data; name="form[refname]"\r\n\r\n\r\n------WebKitFormBoundaryb1chvkAVZSF3hPSu\r\nContent-Disposition: form-data; name="form[refid]"\r\n\r\n\r\n------WebKitFormBoundaryb1chvkAVZSF3hPSu\r\nContent-Disposition: form-data; name="form[refmod]"\r\n\r\n\r\n------WebKitFormBoundaryb1chvkAVZSF3hPSu\r\nContent-Disposition: form-data; name="form[csrf_hash]"\r\n\r\ncsrf_ab09f7887d9dacfe1489b68b64fe6a01\r\n------WebKitFormBoundaryb1chvkAVZSF3hPSu--\r\n'
#get data from second page
curl -k -l --cookie part1.cookie

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