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;; cgi-get.jl -- return the parameters from a CGI GET request
;; Copyright (C) 1999 John Harper <john@dcs.warwick.ac.uk>
;; $Id: cgi-get.jl,v 1.9 2001/09/15 21:43:12 jsh Exp $
;; This file is part of librep.
;; librep is free software; you can redistribute it and/or modify it
;; under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.
;; librep is distributed in the hope that it will be useful, but
;; WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
;; GNU General Public License for more details.
;; You should have received a copy of the GNU General Public License
;; along with librep; see the file COPYING. If not, write to
;; the Free Software Foundation, 675 Mass Ave, Cambridge, MA 02139, USA.
(declare (unsafe-for-call/cc))
(define-structure rep.www.cgi-get
(export cgi-get-params)
(open rep
rep.system
rep.regexp
rep.test.framework)
(define-structure-alias cgi-get rep.www.cgi-get)
(define unquote-plus-map (let ((map (make-string (1+ ?+)))
(i 0))
(while (< i ?+)
(aset map i i)
(setq i (1+ i)))
(aset map ?+ ? )
map))
(defun cgi-get-params (#!optional query-string)
(unless query-string
(setq query-string (getenv "QUERY_STRING")))
(let
((point 0)
(params nil)
name value)
(while (string-looking-at "([^=]+)=([^&]*)(&|$)" query-string point)
(setq point (match-end))
(setq name (intern
(unquote
(substring query-string (match-start 1) (match-end 1)))))
(setq value (unquote
(substring query-string (match-start 2) (match-end 2))))
(when (string= value "")
(setq value nil))
(setq params (cons (cons name value) params)))
(nreverse params)))
(defsubst hexdigit (char)
(if (and (>= char ?0) (<= char ?9))
(- char ?0)
(+ (- (char-upcase char) ?A) 10)))
(defun unquote (string)
(let
((frags nil)
(point 0))
(setq string (translate-string string unquote-plus-map))
(while (string-match "%.." string point)
(setq frags (cons (substring string point (match-start)) frags))
(setq point (match-end))
(setq frags (cons (+ (* (hexdigit (aref string (- point 2))) 16)
(hexdigit (aref string (1- point)))) frags)))
(if (zerop point)
string
(setq frags (cons (substring string point) frags))
(apply concat (nreverse frags)))))
;; Tests
(define (self-test)
(test (equal (cgi-get-params "")
'()))
(test (equal (cgi-get-params "foo=bar")
'((foo . "bar"))))
(test (equal (cgi-get-params "foo=bar&baz=quux")
'((foo . "bar") (baz . "quux"))))
(test (equal (cgi-get-params "foo=&baz=quux")
'((foo . ()) (baz . "quux"))))
(test (equal (cgi-get-params "foo=%3A%2F%3D")
'((foo . ":/="))))
(test (equal (cgi-get-params "foo=+bar+")
'((foo . " bar ")))))
;;###autoload
(define-self-test 'rep.www.cgi-get self-test))
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