52 lines
2.2 KiB
Scheme
52 lines
2.2 KiB
Scheme
;;; NCSA's WWW Common Gateway Interface -- script-side code -*- Scheme -*-
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;;; This file is part of the Scheme Untergrund Networking package.
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;;; Copyright (c) 1995 by Olin Shivers.
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;;; For copyright information, see the file COPYING which comes with
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;;; the distribution.
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;;; See http://hoohoo.ncsa.uiuc.edu/cgi/interface.html for a sort of "spec".
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;;; This file provides routines to help you write programs in Scheme
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;;; that can interface to HTTP servers using the CGI program interface
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;;; to carry out HTTP transactions.
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;;; ISINDEX queries:
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; (Likewise for ISINDEX URL queries from browsers.)
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;;; Browser url-form encodes the query (see above), which then becomes the
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;;; ?<search> part of the URI. (Hence the CGI script will split the individual
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;;; fields into argv[].)
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;;; CGI interface:
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;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
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;;; - The URL's <search> part is assigned to env var $QUERY_STRING, undecoded.
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;;; - If it contains no raw "=" chars, it is split at "+" chars. The
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;;; substrings are URI decoded, and become the elts of argv[]. You aren't
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;;; supposed to rely on this unless you are replying to ISINDEX queries.
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;;; - The CGI script is run with stdin hooked up to the socket. If it's going
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;;; to read the entity, it should read $CONTENT_LENGTH bytes worth.
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;;; - A bunch of env vars are set with useful values.
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;;; - Entity block is passed to script on stdin;
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;;; script writes reply to stdout.
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;;; - If the script begins with "nph-" its output is the entire reply.
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;;; Otherwise, when it replies to the server, it sends back a special
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;;; little header that tells the server how to construct the real header
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;;; for the reply.
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;;; See the "spec" for further details. (URL above)
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(define (cgi-form-query)
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(let ((request-method (getenv "REQUEST_METHOD")))
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(cond
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((string=? request-method "GET")
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(parse-html-form-query (getenv "QUERY_STRING")))
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((string=? request-method "POST")
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(let ((nchars (string->number (getenv "CONTENT_LENGTH"))))
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(parse-html-form-query (read-string nchars))))
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(else (error "Method not handled."))))) ; Don't be calling me.
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