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;; 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>
(declare (unit cookie))
(require-extension srfi-1 srfi-13 srfi-14 regex)
;; (use srfi-1 srfi-13 srfi-14 regex)
(declare (export parse-cookie-string construct-cookie-string))
;; (declare (export parse-cookie-string construct-cookie-string))
#>
#include <time.h>
<#
(define fmt-time
(foreign-lambda* c-string ((long secs_since_epoch))
"static char buf[256];"
"time_t t = (time_t) secs_since_epoch;"
"strftime(buf, sizeof(buf), \"%a, %d-%b-%Y %H:%M:%S GMT\", gmtime(&t));"
"return(buf);"))
;; #>
;; #include <time.h>
;; <#
;;
;; (define fmt-time
;; (foreign-lambda* c-string ((long secs_since_epoch))
;; "static char buf[256];"
;; "time_t t = (time_t) secs_since_epoch;"
;; "strftime(buf, sizeof(buf), \"%a, %d-%b-%Y %H:%M:%S GMT\", gmtime(&t));"
;; "return(buf);"))
;;
(define (fmt-time seconds)
(time->string (seconds->utc-time seconds) "%D"))
;; 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)
(regexp "\\s*([\\w$_-]+)\\s*([=\\;]\\s*)?")
(regexp "\\s*([\\w$_-]+)\\s*([=\\;,]\\s*)?")))
(define attr-delim
(if (= version 0) #\; (char-set #\, #\\ #\;)))
(define (read-attr input r)
(cond ((string-null? input) (reverse! r))
((string-search attr-regexp input)
=> (lambda (m)
(if (and-let* ((delimiter (third m))) ;;is an attr_value pai
(string-prefix? "=" delimiter))
(let ((attr (second m))
(rest (string-search-after attr-regexp input)))
(if (string-prefix? "\"" rest)
(read-token-quoted attr (string-drop rest 1) r)
(read-token attr rest r)))
(read-attr (string-search-after attr-regexp input) ;; Skip ahead if broken input?
(alist-cons (second m) #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))
(alist-cons attr
(string-trim-right (string-take input i))
r))))
(else
(reverse! (alist-cons attr (string-trim-right input) r)))))
(define (read-token-quoted attr input r)
(let loop ((input input)
(partial '()))
(cond ((string-index input (char-set #\\ #\"))
=> (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))
(cons* (string (string-ref input (+ i 1)))
(string-take input i)
partial)))
(read-attr (string-drop input (+ i 1))
(alist-cons 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 #!optional version)
(let ((ver (cond ((integer? version) version)
((string-search "^\\s*\\$Version\\s*=\\s*(\\d+)" input)
=> (lambda (m)
(string->number (cadr m))))
(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=? "$path" (caar av-pairs))
(loop (cdr av-pairs) r (cons* (cdar av-pairs) path: current)))
((string-ci=? "$domain" (caar av-pairs))
(loop (cdr av-pairs) r (cons* (cdar av-pairs) domain: current)))
((string-ci=? "$port" (caar av-pairs))
(loop (cdr av-pairs) r (cons* (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 #!optional (version 1))
(map (lambda (spec) (construct-cookie-string-1 spec version))
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))
(error (conc "bad cookie spec: attribute " (car attr) " requires value" )))
((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 (sprintf "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 (sprintf "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))))
))
)
;; (define (quote-value value)
;; (string-append "\"" (regexp-replace-all #/\"|\\/ value "\\\\\\0") "\""))
(define (quote-value value)
(string-append "\"" (string-substitute* value '(("\\\"" . "\\\"") ("\\\\" . "\\\\"))) "\""))
(define quote-if-needed
(let ((rx (regexp "[\\\",;\\\\ \\t\\n]")))
(lambda (value)
(if (string-search rx value)
(quote-value value)
value))))
(define (make-expires-attr time)
(sprintf "Expires=~a"
(if (number? time)
(fmt-time time)
time)))
;;;; Added support functions from my utils, split this out
(define (string-search-after r s #!optional (start 0))
(and-let* ((match-indices (string-search-positions r s start))
(right-match (second (first match-indices))))
(substring s right-match)))
;; 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)
(regexp "\\s*([\\w$_-]+)\\s*([=\\;]\\s*)?")
(regexp "\\s*([\\w$_-]+)\\s*([=\\;,]\\s*)?")))
(define attr-delim
(if (= version 0) #\; (char-set #\, #\\ #\;)))
(define (read-attr input r)
(cond ((string-null? input) (reverse! r))
((string-search attr-regexp input)
=> (lambda (m)
(if (and-let* ((delimiter (third m))) ;;is an attr_value pai
(string-prefix? "=" delimiter))
(let ((attr (second m))
(rest (string-search-after attr-regexp input)))
(if (string-prefix? "\"" rest)
(read-token-quoted attr (string-drop rest 1) r)
(read-token attr rest r)))
(read-attr (string-search-after attr-regexp input) ;; Skip ahead if broken input?
(alist-cons (second m) #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))
(alist-cons attr
(string-trim-right (string-take input i))
r))))
(else
(reverse! (alist-cons attr (string-trim-right input) r)))))
(define (read-token-quoted attr input r)
(let loop ((input input)
(partial '()))
(cond ((string-index input (char-set #\\ #\"))
=> (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))
(cons* (string (string-ref input (+ i 1)))
(string-take input i)
partial)))
(read-attr (string-drop input (+ i 1))
(alist-cons 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 #!optional version)
(let ((ver (cond ((integer? version) version)
((string-search "^\\s*\\$Version\\s*=\\s*(\\d+)" input)
=> (lambda (m)
(string->number (cadr m))))
(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=? "$path" (caar av-pairs))
(loop (cdr av-pairs) r (cons* (cdar av-pairs) path: current)))
((string-ci=? "$domain" (caar av-pairs))
(loop (cdr av-pairs) r (cons* (cdar av-pairs) domain: current)))
((string-ci=? "$port" (caar av-pairs))
(loop (cdr av-pairs) r (cons* (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 #!optional (version 1))
(map (lambda (spec) (construct-cookie-string-1 spec version))
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))
(error (conc "bad cookie spec: attribute " (car attr) " requires value" )))
((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 (sprintf "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 (sprintf "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))))
))
)
;; (define (quote-value value)
;; (string-append "\"" (regexp-replace-all #/\"|\\/ value "\\\\\\0") "\""))
(define (quote-value value)
(string-append "\"" (string-substitute* value '(("\\\"" . "\\\"") ("\\\\" . "\\\\"))) "\""))
(define quote-if-needed
(let ((rx (regexp "[\\\",;\\\\ \\t\\n]")))
(lambda (value)
(if (string-search rx value)
(quote-value value)
value))))
(define (make-expires-attr time)
(sprintf "Expires=~a"
(if (number? time)
(fmt-time time)
time)))
;;;; Added support functions from my utils, split this out
(define (string-search-after r s #!optional (start 0))
(and-let* ((match-indices (string-search-positions r s start))
(right-match (second (first match-indices))))
(substring s right-match)))
|