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emacs/lisp/url/url-cookie.el
Miles Bader 59ce725a3b Merge from emacs--rel--22 
Revision: emacs@sv.gnu.org/emacs--devo--0--patch-987
2008-01-08 20:46:54 +00:00

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EmacsLisp
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;;; url-cookie.el --- Netscape Cookie support
;; Copyright (C) 1996, 1997, 1998, 1999, 2004,
;; 2005, 2006, 2007, 2008 Free Software Foundation, Inc.
;; Keywords: comm, data, processes, hypermedia
;; 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 3, 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
;; 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 GNU Emacs; see the file COPYING. If not, write to the
;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, USA.
;;; Commentary:
;;; Code:
(require 'timezone)
(require 'url-util)
(require 'url-parse)
(eval-when-compile (require 'cl))
;; See http://home.netscape.com/newsref/std/cookie_spec.html for the
;; 'open standard' defining this crap.
(defgroup url-cookie nil
"URL cookies."
:prefix "url-"
:prefix "url-cookie-"
:group 'url)
;; A cookie is stored internally as a vector of 7 slots
;; [ cookie NAME VALUE EXPIRES LOCALPART DOMAIN SECURE ]
(defstruct (url-cookie
(:constructor url-cookie-create)
(:copier nil)
;; For compatibility with a previous version which did not use
;; defstruct, and also in order to make sure that the printed
;; representation does not depend on CL internals, we use an
;; explicitly managed tag.
(:type vector))
(tag 'cookie :read-only t)
name value expires localpart domain secure)
(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
"File 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 http://www.hotmail.com/, only accept cookies
when they are on one line. This is broken behavior, but just try
telling Microsoft that."
:type 'boolean
:group 'url-cookie)
(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
;; It's completely normal for the cookies file not to exist yet.
;; (message "Could not load cookie file %s" fname)
)))
(declare-function url-cookie-p "url-cookie" t t) ; defstruct
(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)))
nil
(setq new-cookies (cons cur-cookie new-cookies))))
(if (not new-cookies)
nil
(setcdr cur new-cookies)
(setq new (cons cur new))))
(set var new)))
(defun url-cookie-write-file (&optional fname)
(when url-cookies-changed-since-last-save
(or fname (setq fname (expand-file-name url-cookie-file)))
(if (condition-case nil
(progn
(url-make-private-file fname)
nil)
(error t))
(message "Error accessing cookie file `%s'" fname)
(url-cookie-clean-up)
(url-cookie-clean-up t)
(with-temp-buffer
(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")
(insert " \n;; Local Variables:\n"
";; version-control: never\n"
";; no-byte-compile: t\n"
";; End:\n")
(set (make-local-variable 'version-control) 'never)
(write-file fname))
(setq url-cookies-changed-since-last-save nil))))
(defun url-cookie-store (name value &optional expires domain localpart secure)
"Store 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.
(progn
(setq storage (cdr found-domain)
tmp nil)
(while storage
(setq cur (car storage)
storage (cdr storage))
(if (and (equal localpart (url-cookie-localpart cur))
(equal name (url-cookie-name cur)))
(progn
(setf (url-cookie-expires cur) expires)
(setf (url-cookie-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
:localpart localpart
: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
:localpart localpart
:secure secure))
(cond
(storage
(setcdr storage (cons (list domain tmp) (cdr storage))))
(secure
(setq url-cookie-secure-storage (list (list domain tmp))))
(t
(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-number (aref cur-date 1))
(string-to-number (aref cur-date 2))
(string-to-number (aref cur-date 0)))))
(exp-greg (and exp (timezone-absolute-from-gregorian
(string-to-number (aref exp-date 1))
(string-to-number (aref exp-date 2))
(string-to-number (aref exp-date 0)))))
(diff-in-days (and exp (- cur-greg exp-greg)))
)
(cond
((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-number (aref cur-time 2)))
(* 60 (string-to-number (aref cur-time 1)))
(* 1 (string-to-number (aref cur-time 0)))))
(exp-norm (+ (* 360 (string-to-number (aref exp-time 2)))
(* 60 (string-to-number (aref exp-time 1)))
(* 1 (string-to-number (aref exp-time 0))))))
(> (- cur-norm exp-norm) 1))))))
(defun url-cookie-retrieve (host localpart &optional secure)
"Retrieve all the netscape-style cookies for a specified HOST and LOCALPART."
(let ((storage (if secure
(append url-cookie-secure-storage url-cookie-storage)
url-cookie-storage))
(case-fold-search t)
(cookies nil)
(cur nil)
(retval nil)
(localpart-regexp nil))
(while storage
(setq cur (car storage)
storage (cdr storage)
cookies (cdr cur))
(if (and (car cur)
(string-match
(concat "^.*"
(regexp-quote
;; Remove the dot from wildcard domains
;; before matching.
(if (eq ?. (aref (car cur) 0))
(substring (car cur) 1)
(car cur)))
"$") host))
;; The domains match - a possible hit!
(while cookies
(setq cur (car cookies)
cookies (cdr cookies)
localpart-regexp (concat "^" (regexp-quote
(url-cookie-localpart cur))))
(if (and (string-match localpart-regexp localpart)
(not (url-cookie-expired-p cur)))
(setq retval (cons cur retval))))))
retval))
(defun url-cookie-generate-header-lines (host localpart secure)
(let* ((cookies (url-cookie-retrieve host localpart secure))
(retval nil)
(cur nil)
(chunk nil))
;; Have to sort this for sending most specific cookies first
(setq cookies (and cookies
(sort cookies
(function
(lambda (x y)
(> (length (url-cookie-localpart x))
(length (url-cookie-localpart y))))))))
(while cookies
(setq cur (car cookies)
cookies (cdr cookies)
chunk (format "%s=%s" (url-cookie-name cur) (url-cookie-value cur))
retval (if (and url-cookie-multiple-line
(< 80 (+ (length retval) (length chunk) 4)))
(concat retval "\r\nCookie: " chunk)
(if retval
(concat retval "; " chunk)
(concat "Cookie: " chunk)))))
(if retval
(concat retval "\r\n")
"")))
(defvar url-cookie-two-dot-domains
(concat "\\.\\("
(mapconcat 'identity (list "com" "edu" "net" "org" "gov" "mil" "int")
"\\|")
"\\)$")
"A regexp 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)
(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))
(cond
((string= host domain) ; Apparently netscape lets you do this
t)
((>= 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
;; Remove the dot from wildcard domains
;; before matching.
(if (eq ?. (aref domain 0))
(substring domain 1)
domain))
"$") host))
(t
nil))))
(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-string "secure" args t) t))
(domain (or (cdr-safe (assoc-string "domain" args t))
(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-string "expires" args t)))
(localpart (or (cdr-safe (assoc-string "path" args t))
(file-name-directory
(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
(string-match
(concat "^[^,]+, +\\(..\\)-\\(...\\)-\\(..\\) +"
"\\(..:..:..\\) +\\[*\\([^\]]+\\)\\]*$")
expires))
(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
(string-match
"\\([0-9]+\\)-\\([A-Za-z]+\\)-\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9]+:[0-9]+\\)\\(\\.[0-9]+\\)*[ \t]+\\([-+a-zA-Z0-9]+\\)"
expires))
(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)))
(cond
(untrusted
;; The site was explicity marked as untrusted by the user
nil)
((or (eq url-privacy-level 'paranoid)
(and (listp url-privacy-level) (memq 'cookies url-privacy-level)))
;; user never wants cookies
nil)
((and url-cookie-confirmation
(not trusted)
(save-window-excursion
(with-output-to-temp-buffer "*Cookie Warning*"
(mapcar
(function
(lambda (x)
(princ (format "%s - %s" (car x) (cdr x))))) rest))
(prog1
(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.
nil)
((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 localpart secure))))
(t
(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 #'(lambda (var val)
(set-default var val)
(if (bound-and-true-p url-setup-done)
(url-cookie-setup-save-timer)))
:type 'integer
:group 'url-cookie)
(defun url-cookie-setup-save-timer ()
"Reset the cookie saver timer."
(interactive)
(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
url-cookie-save-interval
#'url-cookie-write-file))))
(provide 'url-cookie)
;; arch-tag: 2568751b-6452-4398-aa2d-303edadb54d7
;;; url-cookie.el ends here
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