/usr/share/gauche-0.9/0.9.1/lib/rfc/cookie.scm is in gauche 0.9.1-5.
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;;; cookie.scm - parse and construct http state information
;;;
;;; Copyright (c) 2000-2010 Shiro Kawai <shiro@acm.org>
;;;
;;; Redistribution and use in source and binary forms, with or without
;;; modification, are permitted provided that the following conditions
;;; are met:
;;;
;;; 1. Redistributions of source code must retain the above copyright
;;; notice, this list of conditions and the following disclaimer.
;;;
;;; 2. Redistributions in binary form must reproduce the above copyright
;;; notice, this list of conditions and the following disclaimer in the
;;; documentation and/or other materials provided with the distribution.
;;;
;;; 3. Neither the name of the authors nor the names of its contributors
;;; may be used to endorse or promote products derived from this
;;; software without specific prior written permission.
;;;
;;; THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS
;;; "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT
;;; LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR
;;; A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT
;;; OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL,
;;; SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT LIMITED
;;; TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, DATA, OR
;;; PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY THEORY OF
;;; LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT (INCLUDING
;;; NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE OF THIS
;;; SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.
;;;
;; Parser and constructor of http "Cookies" defined in
;; RFC 2965 HTTP state managemnet mechanism
;; <ftp://ftp.isi.edu/in-notes/rfc2965.txt>
;; See also
;; RFC 2964 Use of HTTP state management
;; <ftp://ftp.isi.edu/in-notes/rfc2964.txt>
;; The parser also supports the old Netscape spec
;; <http://www.netscape.com/newsref/std/cookie_spec.html>
(define-module rfc.cookie
(use srfi-1)
(use srfi-13)
(use srfi-19)
(use util.trie)
(export parse-cookie-string
construct-cookie-string
)
)
(select-module rfc.cookie)
;;==============================================================
;; Cookie header parser and constructor
;; These are mainly used by the server side.
;;
;; utility fn. breaks ``attr=value;attr=value ... '' into alist.
;; version is a cookie version. if version>0, we allow comma as the
;; delimiter as well as semicolon.
(define (parse-av-pairs input version)
(define attr-regexp
(if (= version 0)
#/\s*([\w$_-]+)\s*([=\;]\s*)?/
#/\s*([\w$_-]+)\s*([=\;,]\s*)?/))
(define attr-delim
(if (= version 0) #\; #[,\;]))
(define (read-attr input r)
(cond ((string-null? input) (reverse! r))
((rxmatch attr-regexp input)
=> (lambda (m)
(if (and-let* ((delimiter (rxmatch-substring m 2)))
(string-prefix? "=" delimiter))
(let ((attr (rxmatch-substring m 1))
(rest (rxmatch-after m)))
(if (string-prefix? "\"" rest)
(read-token-quoted attr (string-drop rest 1) r)
(read-token attr rest r)))
(read-attr (rxmatch-after m)
(acons (rxmatch-substring m 1) #f r)))))
(else
;; the input is broken; for now, we ignore the rest.
(reverse! r))))
(define (read-token attr input r)
(cond ((string-index input attr-delim)
=> (lambda (i)
(read-attr (string-drop input (+ i 1))
(acons attr
(string-trim-right (string-take input i))
r))))
(else
(reverse! (acons attr (string-trim-right input) r)))))
(define (read-token-quoted attr input r)
(let loop ((input input)
(partial '()))
(cond ((string-index input #[\\\"])
=> (lambda (i)
(let ((c (string-ref input i)))
(if (char=? c #\\)
(if (< (string-length input) (+ i 1))
(error-unterminated attr)
(loop (string-drop input (+ i 2))
(list* (string (string-ref input (+ i 1)))
(string-take input i)
partial)))
(read-attr (string-drop input (+ i 1))
(acons attr
(string-concatenate-reverse
(cons (string-take input i)
partial))
r))))))
(else (error-unterminated attr)))))
(define (error-unterminated attr)
(error "Unterminated quoted value given for attribute" attr))
(read-attr input '()))
;; Parses the header value of "Cookie" request header.
;; If cookie version is known by "Cookie2" request header, it should
;; be passed to version (as integer). Otherwise, it figures out
;; the cookie version from input.
;;
;; Returns the following format.
;; ((<name> <value> [:path <path>] [:domain <domain>] [:port <port>])
;; ...)
(define (parse-cookie-string input . version)
(let ((ver (cond ((and (pair? version) (integer? (car version)))
(car version))
((rxmatch #/^\s*$Version\s*=\s*(\d+)/ input)
=> (lambda (m)
(string->number (rxmatch-substring m 1))))
(else 0))))
(let loop ((av-pairs (parse-av-pairs input ver))
(r '())
(current '()))
(cond ((null? av-pairs)
(if (null? current)
(reverse r)
(reverse (cons (reverse current) r))))
((string-ci=? "$path" (caar av-pairs))
(loop (cdr av-pairs) r (list* (cdar av-pairs) :path current)))
((string-ci=? "$domain" (caar av-pairs))
(loop (cdr av-pairs) r (list* (cdar av-pairs) :domain current)))
((string-ci=? "$port" (caar av-pairs))
(loop (cdr av-pairs) r (list* (cdar av-pairs) :port current)))
(else
(if (null? current)
(loop (cdr av-pairs) r (list (cdar av-pairs) (caar av-pairs)))
(loop (cdr av-pairs)
(cons (reverse current) r)
(list (cdar av-pairs) (caar av-pairs)))))))
))
;; Construct a cookie string suitable for Set-Cookie or Set-Cookie2 header.
;; specs is the following format.
;;
;; ((<name> <value> [:comment <comment>] [:comment-url <comment-url>]
;; [:discard <bool>] [:domain <domain>]
;; [:max-age <age>] [:path <value>] [:port <port-list>]
;; [:secure <bool>] [:version <version>] [:expires <date>]
;; ) ...)
;;
;; Returns a list of cookie strings for each <name>=<value> pair. In the
;; ``new cookie'' implementation, you can join them by comma and send it
;; at once with Set-cookie2 header. For the old netscape protocol, you
;; must send each of them by Set-cookie header.
(define (construct-cookie-string specs . version)
(let ((ver (if (and (pair? version) (integer? (car version)))
(car version)
1)))
(map (lambda (spec) (construct-cookie-string-1 spec ver)) specs)))
(define (construct-cookie-string-1 spec ver)
(when (< (length spec) 2)
(error "bad cookie spec: at least <name> and <value> required" spec))
(let ((name (car spec))
(value (cadr spec)))
(let loop ((attr (cddr spec))
(r (list (if value
(string-append name "="
(quote-if-needed value))
name))))
(define (next s) (loop (cddr attr) (cons s r)))
(define (ignore) (loop (cddr attr) r))
(cond
((null? attr) (string-join (reverse r) ";"))
((null? (cdr attr))
(errorf "bad cookie spec: attribute ~s requires value" (car attr)))
((eqv? :comment (car attr))
(if (> ver 0)
(next (string-append "Comment=" (quote-if-needed (cadr attr))))
(ignore)))
((eqv? :comment-url (car attr))
(if (> ver 0)
(next (string-append "CommentURL=" (quote-value (cadr attr))))
(ignore)))
((eqv? :discard (car attr))
(if (and (> ver 0) (cadr attr)) (next "Discard") (ignore)))
((eqv? :domain (car attr))
(next (string-append "Domain=" (cadr attr))))
((eqv? :max-age (car attr))
(if (> ver 0)
(next (format #f "Max-Age=~a" (cadr attr)))
(ignore)))
((eqv? :path (car attr))
(next (string-append "Path=" (quote-if-needed (cadr attr)))))
((eqv? :port (car attr))
(if (> ver 0)
(next (string-append "Port=" (quote-value (cadr attr))))
(ignore)))
((eqv? :secure (car attr))
(if (cadr attr) (next "Secure") (ignore)))
((eqv? :version (car attr))
(if (> ver 0)
(next (format #f "Version=~a" (cadr attr)))
(ignore)))
((eqv? :expires (car attr))
(if (> ver 0)
(ignore)
(next (make-expires-attr (cadr attr)))))
(else (error "Unknown cookie attribute" (car attr))))
))
)
;; aux. function to quote value
(define (quote-value value)
(string-append "\"" (regexp-replace-all #/\"|\\/ value "\\\\\\0") "\""))
(define (quote-if-needed value)
(if (rxmatch #/[\",\;\\ \t\n]/ value)
(quote-value value)
value))
(define (make-expires-attr time)
(define (ensure-time-string time)
(cond
((number? time)
(sys-strftime "%a, %d-%b-%Y %H:%M:%S GMT" (sys-gmtime time)))
((is-a? time <date>)
(date->string time "~a, ~d-~@b-~Y ~H:~M:~S GMT"))
((is-a? time <time>)
(case (time-type time)
((time-utc) (ensure-time-string (time-utc->date time 0)))
((time-tai) (ensure-time-string (time-tai->date time 0)))
((time-monotonic) (ensure-time-string (time-monotonic->date time 0)))
(else (errorf "Don't know how to convert a time object ~s to string."
time))))
(else time)))
(format #f "Expires=~a" (ensure-time-string time)))
;;==============================================================
;; Cookie-bin, a client-side storage of cookies used by <http-connection>
;;
;; Client-side cookie representation.
;; Max-Age is converted to the absolute time when the cookie shall be
;; discarded.
; (define-class <http-cookie> ()
; ((name :init-keyword :name)
; (value :init-keyword :value)
; (domain :init-keyword :domain)
; (path :init-keyword :path)
; (lifetime :init-keyword :lifetime :init-value #f) ; #f or <time>
; (port :init-keyword :port :init-value '()) ; list of port numbers
; (secure :init-keyword :secure :init-value #f)
; (version :init-keyword :version :init-value 1)
; (comment :init-keyword :comment :init-value #f)
; (comment-url :init-keyword :comment-url :init-value #f)
; ))
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