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;; Tekuti
;; Copyright (C) 2008 Andy Wingo <wingo at pobox dot com>
;; This program 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 3 of
;; the License, or (at your option) any later version.
;;
;; This program 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 this program; if not, contact:
;;
;; Free Software Foundation Voice: +1-617-542-5942
;; 59 Temple Place - Suite 330 Fax: +1-617-542-2652
;; Boston, MA 02111-1307, USA gnu@gnu.org
;;; Commentary:
;;
;; This is the main script that will launch tekuti.
;;
;;; Code:
(define-module (tekuti request)
#:use-module ((srfi srfi-1) #:select (find-tail fold))
#:use-module (tekuti match-bind)
#:use-module (tekuti util)
#:use-module (tekuti url)
#:use-module (tekuti config)
#:use-module (tekuti base64)
#:use-module (rnrs bytevectors)
#:export (make-request rcons rcons* rpush rpush* rref let-request
request-path-case request-authenticated?
request-form-data request-server-name))
(define (header-ref headers key default)
(let ((pair (assoc key headers)))
(if pair
(cdr pair)
default)))
(define (parse-www-form-urlencoded str)
(map
(lambda (piece)
(let ((equals (string-index piece #\=)))
(if equals
(cons (url:decode (substring piece 0 equals))
(url:decode (substring piece (1+ equals))))
(cons (url:decode piece) ""))))
(string-split str #\&)))
(define *request-initializers*
`((path . ,(lambda (r)
(let ((private-url-path (url:path-split *private-url-base*))
(path (header-ref (rref r 'headers '())
"url" *private-url-base*)))
(let* ((tail (list-head-match private-url-path
(url:path-split path)
(length private-url-path))))
(or tail (error "unexpected path" path *private-url-base*))
tail))))
(path-str . ,(lambda (r)
(url:path-join (rref r 'path '()))))
(query . ,(lambda (r)
(or (and=> (url:query-part
(header-ref (rref r 'headers '()) "url" ""))
parse-www-form-urlencoded)
'())))
(method . ,(lambda (r)
(header-ref (rref r 'headers '()) "method" "GET")))))
(define (request-form-data request)
(let-request request (headers post-data)
(if (string-null? post-data)
'()
(let ((content-type (assoc-ref headers "content-type")))
(cond
((equal? content-type "application/x-www-form-urlencoded")
(parse-www-form-urlencoded post-data))
(else
(error "bad content-type" content-type)))))))
(define (make-request . keys-and-values)
(fold (lambda (pair r)
(rcons (car pair) ((cdr pair) r) r))
(apply rcons* '() keys-and-values)
*request-initializers*))
(define (rcons k v request)
(or (symbol? k) (error "request keys should be symbols"))
(acons k v request))
(define (rcons* request . keys-and-values)
(let lp ((request request) (kv keys-and-values))
(if (null? kv)
request
(lp (rcons (car kv) (cadr kv) request) (cddr kv)))))
(define (rpush k v request)
(rcons k (cons v (rref request k '())) request))
(define (rpush* request . keys-and-values)
(let lp ((request request) (kv keys-and-values))
(if (null? kv)
request
(lp (rpush (car kv) (cadr kv) request) (cddr kv)))))
(define* (rref request k #:optional (default #f) #:key (default-proc #f))
(let ((pair (assq k request)))
(cond
(pair (cdr pair))
(default-proc (default-proc request k))
(else default))))
;; danger here, regarding the optional alternate clauses...
(define (request-authenticated? request)
(let ((headers (rref request 'headers '())))
(let ((auth (assoc-ref headers "authorization")))
(and auth
(match-bind "^Basic ([A-Za-z0-9+/=]*)$" auth (_ b64)
(match-bind "^([^:]*):(.*)$"
(utf8->string (base64-decode b64))
(_ user pass)
(and (equal? user *admin-user*)
(equal? pass *admin-pass*))
#f)
#f)))))
(define-syntax let-request
(lambda (stx)
(define (make-binding b)
(syntax-case b ()
((id option ...)
(identifier? #'id)
#'(id (rref request-var 'id option ...)))
(id
(identifier? #'id)
#'(id (rref request-var 'id)))))
(syntax-case stx ()
((_ request (binding ...) body ...)
(with-syntax (((binding ...) (map make-binding #'(binding ...))))
#'(let ((request-var request))
(let (binding ...)
body ...)))))))
(define-syntax path-proc-case
(lambda (stx)
(define (optional-argument? arg)
(eqv? (string-ref arg (- (string-length arg) 1)) #\?))
(define (required-argument? arg)
(eqv? (string-ref arg (- (string-length arg) 1)) #\!))
(define (output-argument? arg)
(or (optional-argument? arg) (required-argument? arg)))
(define (process-clause clause)
(syntax-case clause (else)
((else expr ...) clause)
(((p ...) proc)
(let ((pat (map (lambda (p)
(symbol->string (syntax->datum p)))
#'(p ...))))
(cond
((find-tail output-argument? pat)
=> (lambda (tail)
(let* ((req (find-tail required-argument? tail))
(opt (find-tail optional-argument? tail))
(npat (length pat))
(ntail (length tail))
(nopt (if opt (length opt) 0))
(nreq (if req (- (length req) nopt) 0)))
#`((let ((pathtail (list-head-match '#,pat
path-var
(- #,npat #,ntail))))
;;(pk pat npat ntail req opt nopt nreq path pathtail)
(if (and pathtail (>= (length pathtail) #,nreq)
(<= (length pathtail) (+ #,nreq #,nopt)))
(append
pathtail
(make-list (- (+ #,nreq #,nopt) (length pathtail)) #f))
#f))
=> (lambda (outargs)
(lambda args
(apply proc (append args outargs))))))))
(else
#`((equal? path-var '#,pat) proc)))))))
(syntax-case stx ()
((_ path clause ...)
(with-syntax (((cond-clause ...) (map process-clause #'(clause ...))))
#'(let ((path-var path))
(cond cond-clause ...)))))))
(define (rcons*-fold request . keys-and-procs)
(foldn (lambda (request k proc)
(rcons k (proc request) request))
2 request keys-and-procs))
(define-syntax request-path-case
(syntax-rules ()
((_ request clause ...)
(path-proc-case
(let-request request (method path)
(cons method path))
clause ...))))
(define (request-server-name request)
(let ((headers (rref request 'headers)))
(or (assoc-ref headers "host")
(assoc-ref headers "server-ip-addr"))))
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