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;;; url-cookie.el --- Netscape Cookie support
;; Author: $Author: wmperry $
;; Created: $Date: 2002/10/29 14:44:59 $
;; Version: $Revision: 1.7 $
;; Keywords: comm, data, processes, hypermedia
;;; Copyright (c) 1996 by William M. Perry <>
;;; Copyright (c) 1996 - 1999 Free Software Foundation, Inc.
;;; This file is part of GNU Emacs.
;;; GNU Emacs 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.
;;; GNU Emacs is distributed in the hope that it will be useful,
;;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;;; GNU General Public License for more details.
;;; You should have received a copy of the GNU General Public License
;;; along with GNU Emacs; see the file COPYING. If not, write to the
;;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;;; Boston, MA 02111-1307, USA.
(require 'timezone)
(require 'url-util)
(require 'url-parse)
(eval-when-compile (require 'cl))
;; See for the
;; 'open standard' defining this crap.
;; A cookie is stored internally as a vector of 7 slots
;; [ 'cookie name value expires path domain secure ]
(defsubst url-cookie-name (cookie) (aref cookie 1))
(defsubst url-cookie-value (cookie) (aref cookie 2))
(defsubst url-cookie-expires (cookie) (aref cookie 3))
(defsubst url-cookie-path (cookie) (aref cookie 4))
(defsubst url-cookie-domain (cookie) (aref cookie 5))
(defsubst url-cookie-secure (cookie) (aref cookie 6))
(defsubst url-cookie-set-name (cookie val) (aset cookie 1 val))
(defsubst url-cookie-set-value (cookie val) (aset cookie 2 val))
(defsubst url-cookie-set-expires (cookie val) (aset cookie 3 val))
(defsubst url-cookie-set-path (cookie val) (aset cookie 4 val))
(defsubst url-cookie-set-domain (cookie val) (aset cookie 5 val))
(defsubst url-cookie-set-secure (cookie val) (aset cookie 6 val))
(defsubst url-cookie-retrieve-arg (key args) (nth 1 (memq key args)))
(defsubst url-cookie-create (&rest args)
(let ((retval (make-vector 7 nil)))
(aset retval 0 'cookie)
(url-cookie-set-name retval (url-cookie-retrieve-arg :name args))
(url-cookie-set-value retval (url-cookie-retrieve-arg :value args))
(url-cookie-set-expires retval (url-cookie-retrieve-arg :expires args))
(url-cookie-set-path retval (url-cookie-retrieve-arg :path args))
(url-cookie-set-domain retval (url-cookie-retrieve-arg :domain args))
(url-cookie-set-secure retval (url-cookie-retrieve-arg :secure args))
(defun url-cookie-p (obj)
(and (vectorp obj) (= (length obj) 7) (eq (aref obj 0) 'cookie)))
(defgroup url-cookie nil
"URL cookies"
:prefix "url-"
:prefix "url-cookie-"
:group 'url)
(defvar url-cookie-storage nil "Where cookies are stored.")
(defvar url-cookie-secure-storage nil "Where secure cookies are stored.")
(defcustom url-cookie-file nil "*Where cookies are stored on disk."
:type '(choice (const :tag "Default" :value nil) file)
:group 'url-file
:group 'url-cookie)
(defcustom url-cookie-confirmation nil
"*If non-nil, confirmation by the user is required to accept HTTP cookies."
:type 'boolean
:group 'url-cookie)
(defcustom url-cookie-multiple-line nil
"*If nil, HTTP requests put all cookies for the server on one line.
Some web servers, such as, only accept cookies
when they are on one line. This is broken behaviour, but just try
telling Microsoft that.")
(defvar url-cookies-changed-since-last-save nil
"Whether the cookies list has changed since the last save operation.")
(defun url-cookie-parse-file (&optional fname)
(setq fname (or fname url-cookie-file))
(condition-case ()
(load fname nil t)
(error (message "Could not load cookie file %s" fname))))
(defun url-cookie-clean-up (&optional secure)
(let* (
(var (if secure 'url-cookie-secure-storage 'url-cookie-storage))
(val (symbol-value var))
(cur nil)
(new nil)
(cookies nil)
(cur-cookie nil)
(new-cookies nil)
(while val
(setq cur (car val)
val (cdr val)
new-cookies nil
cookies (cdr cur))
(while cookies
(setq cur-cookie (car cookies)
cookies (cdr cookies))
(if (or (not (url-cookie-p cur-cookie))
(url-cookie-expired-p cur-cookie)
(null (url-cookie-expires cur-cookie)))
(setq new-cookies (cons cur-cookie new-cookies))))
(if (not new-cookies)
(setcdr cur new-cookies)
(setq new (cons cur new))))
(set var new)))
(defun url-cookie-write-file (&optional fname)
(setq fname (or fname url-cookie-file))
((not url-cookies-changed-since-last-save) nil)
((not (file-writable-p fname))
(message "Cookies file %s (see variable `url-cookie-file') is unwritable." fname))
(url-cookie-clean-up t)
(set-buffer (get-buffer-create " *cookies*"))
(insert ";; Emacs-W3 HTTP cookies file\n"
";; Automatically generated file!!! DO NOT EDIT!!!\n\n"
"(setq url-cookie-storage\n '")
(pp url-cookie-storage (current-buffer))
(insert ")\n(setq url-cookie-secure-storage\n '")
(pp url-cookie-secure-storage (current-buffer))
(insert ")\n")
(write-file fname)
(kill-buffer (current-buffer))))))
(defun url-cookie-store (name value &optional expires domain path secure)
"Stores a netscape-style cookie"
(let* ((storage (if secure url-cookie-secure-storage url-cookie-storage))
(tmp storage)
(cur nil)
(found-domain nil))
;; First, look for a matching domain
(setq found-domain (assoc domain storage))
(if found-domain
;; Need to either stick the new cookie in existing domain storage
;; or possibly replace an existing cookie if the names match.
(setq storage (cdr found-domain)
tmp nil)
(while storage
(setq cur (car storage)
storage (cdr storage))
(if (and (equal path (url-cookie-path cur))
(equal name (url-cookie-name cur)))
(url-cookie-set-expires cur expires)
(url-cookie-set-value cur value)
(setq tmp t))))
(if (not tmp)
;; New cookie
(setcdr found-domain (cons
(url-cookie-create :name name
:value value
:expires expires
:domain domain
:path path
:secure secure)
(cdr found-domain)))))
;; Need to add a new top-level domain
(setq tmp (url-cookie-create :name name
:value value
:expires expires
:domain domain
:path path
:secure secure))
(setcdr storage (cons (list domain tmp) (cdr storage))))
(setq url-cookie-secure-storage (list (list domain tmp))))
(setq url-cookie-storage (list (list domain tmp))))))))
(defun url-cookie-expired-p (cookie)
(let* (
(exp (url-cookie-expires cookie))
(cur-date (and exp (timezone-parse-date (current-time-string))))
(exp-date (and exp (timezone-parse-date exp)))
(cur-greg (and cur-date (timezone-absolute-from-gregorian
(string-to-int (aref cur-date 1))
(string-to-int (aref cur-date 2))
(string-to-int (aref cur-date 0)))))
(exp-greg (and exp (timezone-absolute-from-gregorian
(string-to-int (aref exp-date 1))
(string-to-int (aref exp-date 2))
(string-to-int (aref exp-date 0)))))
(diff-in-days (and exp (- cur-greg exp-greg)))
((not exp) nil) ; No expiry == expires at browser quit
((< diff-in-days 0) nil) ; Expires sometime after today
((> diff-in-days 0) t) ; Expired before today
(t ; Expires sometime today, check times
(let* ((cur-time (timezone-parse-time (aref cur-date 3)))
(exp-time (timezone-parse-time (aref exp-date 3)))
(cur-norm (+ (* 360 (string-to-int (aref cur-time 2)))
(* 60 (string-to-int (aref cur-time 1)))
(* 1 (string-to-int (aref cur-time 0)))))
(exp-norm (+ (* 360 (string-to-int (aref exp-time 2)))
(* 60 (string-to-int (aref exp-time 1)))
(* 1 (string-to-int (aref exp-time 0))))))
(> (- cur-norm exp-norm) 1))))))
(defun url-cookie-retrieve (host path &optional secure)
"Retrieves all the netscape-style cookies for a specified HOST and PATH"
(let ((storage (if secure
(append url-cookie-secure-storage url-cookie-storage)
(case-fold-search t)
(cookies nil)
(cur nil)
(retval nil)
(path-regexp nil))
(while storage
(setq cur (car storage)
storage (cdr storage)
cookies (cdr cur))
(if (and (car cur)
(string-match (concat "^.*" (regexp-quote (car cur)) "$") host))
;; The domains match - a possible hit!
(while cookies
(setq cur (car cookies)
cookies (cdr cookies)
path-regexp (concat "^" (regexp-quote
(url-cookie-path cur))))
(if (and (string-match path-regexp path)
(not (url-cookie-expired-p cur)))
(setq retval (cons cur retval))))))
(defun url-cookie-generate-header-lines (host path secure)
(let* ((cookies (url-cookie-retrieve host path secure))
(retval nil)
(cur nil)
(chunk nil))
;; Have to sort this for sending most specific cookies first
(setq cookies (and cookies
(sort cookies
(lambda (x y)
(> (length (url-cookie-path x))
(length (url-cookie-path y))))))))
(while cookies
(setq cur (car cookies)
cookies (cdr cookies)
chunk (format "%s=%s" (url-cookie-name cur) (url-cookie-value cur))
retval (if (and url-cookie-multiple-line
(< 80 (+ (length retval) (length chunk) 4)))
(concat retval "\r\nCookie: " chunk)
(if retval
(concat retval "; " chunk)
(concat "Cookie: " chunk)))))
(if retval
(concat retval "\r\n")
(defvar url-cookie-two-dot-domains
(concat "\\.\\("
(mapconcat 'identity (list "com" "edu" "net" "org" "gov" "mil" "int")
"A regular expression of top-level domains that only require two matching
'.'s in the domain name in order to set a cookie.")
(defcustom url-cookie-trusted-urls nil
"*A list of regular expressions matching URLs to always accept cookies from."
:type '(repeat regexp)
:group 'url-cookie)
(defcustom url-cookie-untrusted-urls nil
"*A list of regular expressions matching URLs to never accept cookies from."
:type '(repeat regexp)
:group 'url-cookie)
(defun url-cookie-host-can-set-p (host domain)
(let ((numdots 0)
(tmp domain)
(last nil)
(case-fold-search t)
(mindots 3))
(while (setq last (string-match "\\." domain last))
(setq numdots (1+ numdots)
last (1+ last)))
(if (string-match url-cookie-two-dot-domains domain)
(setq mindots 2))
((string= host domain) ; Apparently netscape lets you do this
((>= numdots mindots) ; We have enough dots in domain name
;; Need to check and make sure the host is actually _in_ the
;; domain it wants to set a cookie for though.
(string-match (concat (regexp-quote domain) "$") host))
(defun url-cookie-handle-set-cookie (str)
(setq url-cookies-changed-since-last-save t)
(let* ((args (url-parse-args str t))
(case-fold-search t)
(secure (and (assoc-ignore-case "secure" args) t))
(domain (or (cdr-safe (assoc-ignore-case "domain" args))
(url-host url-current-object)))
(current-url (url-view-url t))
(trusted url-cookie-trusted-urls)
(untrusted url-cookie-untrusted-urls)
(expires (cdr-safe (assoc-ignore-case "expires" args)))
(path (or (cdr-safe (assoc-ignore-case "path" args))
(url-filename url-current-object))))
(rest nil))
(while args
(if (not (member (downcase (car (car args)))
'("secure" "domain" "expires" "path")))
(setq rest (cons (car args) rest)))
(setq args (cdr args)))
;; Sometimes we get dates that the timezone package cannot handle very
;; gracefully - take care of this here, instead of in url-cookie-expired-p
;; to speed things up.
(if (and expires
(concat "^[^,]+, +\\(..\\)-\\(...\\)-\\(..\\) +"
"\\(..:..:..\\) +\\[*\\([^\]]+\\)\\]*$")
(setq expires (concat (match-string 1 expires) " "
(match-string 2 expires) " "
(match-string 3 expires) " "
(match-string 4 expires) " ["
(match-string 5 expires) "]")))
;; This one is for older Emacs/XEmacs variants that don't
;; understand this format without tenths of a second in it.
;; Wednesday, 30-Dec-2037 16:00:00 GMT
;; - vs -
;; Wednesday, 30-Dec-2037 16:00:00.00 GMT
(if (and expires
"\\([0-9]+\\)-\\([A-Za-z]+\\)-\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9]+:[0-9]+\\)\\(\\.[0-9]+\\)*[ \t]+\\([-+a-zA-Z0-9]+\\)"
(setq expires (concat (match-string 1 expires) "-" ; day
(match-string 2 expires) "-" ; month
(match-string 3 expires) " " ; year
(match-string 4 expires) ".00 " ; hour:minutes:seconds
(match-string 6 expires)))) ":" ; timezone
(while (consp trusted)
(if (string-match (car trusted) current-url)
(setq trusted (- (match-end 0) (match-beginning 0)))
(pop trusted)))
(while (consp untrusted)
(if (string-match (car untrusted) current-url)
(setq untrusted (- (match-end 0) (match-beginning 0)))
(pop untrusted)))
(if (and trusted untrusted)
;; Choose the more specific match
(if (> trusted untrusted)
(setq untrusted nil)
(setq trusted nil)))
;; The site was explicity marked as untrusted by the user
((or (eq url-privacy-level 'paranoid)
(and (listp url-privacy-level) (memq 'cookies url-privacy-level)))
;; user never wants cookies
((and url-cookie-confirmation
(not trusted)
(with-output-to-temp-buffer "*Cookie Warning*"
(lambda (x)
(princ (format "%s - %s" (car x) (cdr x))))) rest))
(not (funcall url-confirmation-func
(format "Allow %s to set these cookies? "
(url-host url-current-object))))
(if (get-buffer "*Cookie Warning*")
(kill-buffer "*Cookie Warning*")))))
;; user wants to be asked, and declined.
((url-cookie-host-can-set-p (url-host url-current-object) domain)
;; Cookie is accepted by the user, and passes our security checks
(let ((cur nil))
(while rest
(setq cur (pop rest))
(url-cookie-store (car cur) (cdr cur)
expires domain path secure))))
(message "%s tried to set a cookie for domain %s - rejected."
(url-host url-current-object) domain)))))
(defvar url-cookie-timer nil)
(defcustom url-cookie-save-interval 3600
"*The number of seconds between automatic saves of cookies.
Default is 1 hour. Note that if you change this variable outside of
the `customize' interface after `url-do-setup' has been run, you need
to run the `url-cookie-setup-save-timer' function manually."
:set (function (lambda (var val)
(set-default var val)
(and (featurep 'url)
(fboundp 'url-cookie-setup-save-timer)
:type 'integer
:group 'url)
(defun url-cookie-setup-save-timer ()
"Reset the cookie saver timer."
((featurep 'itimer)
(ignore-errors (delete-itimer url-cookie-timer))
(setq url-cookie-timer nil)
(if url-cookie-save-interval
(setq url-cookie-timer
(start-itimer "url-cookie-saver" 'url-cookie-write-file
((fboundp 'run-at-time)
(ignore-errors (cancel-timer url-cookie-timer))
(setq url-cookie-timer nil)
(if url-cookie-save-interval
(setq url-cookie-timer
(run-at-time url-cookie-save-interval
(t nil)))
(provide 'url-cookie)
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