Hi All,
I'm trying to re-write some Common Lisp web-scraping code in Racket.
In Common Lisp, I'm POSTing a login request, and storing the cookie-jar
for subsequent GETs:
(defun login (username password)
"Logs in to www.example.com. Returns a cookie-jar containing
authentication details."
(let ((cookie-jar (make-instance 'drakma:cookie-jar)))
(drakma:http-request "http://www.example.com/login";
:method :post
:parameters `(("username" . ,username) ("password" .
,password))
:cookie-jar cookie-jar)
cookie-jar))
; snip
(defun get-page (page-num cookie-jar)
"Downloads a potentially invalid HTML page containing data to scrape.
Returns a string containing the HTML."
(let ((url (concatenate 'string "http://www.example.com/data/";
(write-to-string page-num))))
(let ((body (drakma:http-request url :cookie-jar cookie-jar)))
(if (search "No data found." body)
nil
body))))
However, I can't find an equivalent in Racket. The latest HTTP
library[1] makes no mention of cookies at all, and AFAICT the cookie
library[2] seems more about correctly serializing and deserializing
them.
Can anyone suggest a way of re-writing the above CL in Racket without
having to implement a bunch of header-parsing stuff?
TIA for any help ...
[1]
https://github.com/plt/racket/blob/master/racket/collects/net/http-client.rkt
[2] http://docs.racket-lang.org/net/cookie.html
--
Duncan Bayne
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