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- ;;; url-cookie.el --- Netscape Cookie support
- ;; Author: wmperry
- ;; Created: 1997/10/28 16:32:00
- ;; Version: 1.20
- ;; Keywords: comm, data, processes, hypermedia
-
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
- ;;; Copyright (c) 1996 by William M. Perry <wmperry@cs.indiana.edu>
- ;;; Copyright (c) 1996, 1997 Free Software Foundation, Inc.
- ;;;
- ;;; This file is not part of GNU Emacs, but the same permissions apply.
- ;;;
- ;;; 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
- ;;; 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., 59 Temple Place - Suite 330,
- ;;; Boston, MA 02111-1307, USA.
- ;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;;
-
- (require 'timezone)
- (require 'cl)
-
- (eval-and-compile
- (let ((keywords
- '(:name :value :expires :path :domain :test :secure)))
- (while keywords
- (or (boundp (car keywords))
- (set (car keywords) (car keywords)))
- (setq keywords (cdr keywords)))))
-
- ;; See http://home.netscape.com/newsref/std/cookie_spec.html 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))
- retval))
-
- (defun url-cookie-p (obj)
- (and (vectorp obj) (= (length obj) 7) (eq (aref obj 0) 'cookie)))
-
- ;;;###autoload
- (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)))
- 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)))
-
- ;;;###autoload
- (defun url-cookie-write-file (&optional fname)
- (setq fname (or fname url-cookie-file))
- (url-cookie-clean-up)
- (url-cookie-clean-up t)
- (save-excursion
- (set-buffer (get-buffer-create " *cookies*"))
- (erase-buffer)
- (fundamental-mode)
- (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.
- (progn
- (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)))
- (progn
- (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))
- (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-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)))
- )
- (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-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))))))
-
- ;;;###autoload
- (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)
- 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)) "$") host))
- ;; The domains match - a possible hit!
- (while cookies
- (setq cur (car cookies)
- cookies (cdr cookies)
- path-regexp (concat "^" (regexp-quote
- (url-cookie-path cur))))
- (if (and (string-match path-regexp path)
- (not (url-cookie-expired-p cur)))
- (setq retval (cons cur retval))))))
- retval))
-
- ;;;###autolaod
- (defun url-cookie-generate-header-lines (host path secure)
- (let* ((cookies (url-cookie-retrieve host path secure))
- (retval nil)
- (cur nil)
- (chunk nil))
- ;; Have to sort this for sending most specific cookies first
- (setq cookies (and cookies
- (sort cookies
- (function
- (lambda (x y)
- (> (length (url-cookie-path x))
- (length (url-cookie-path y))))))))
- (while cookies
- (setq cur (car cookies)
- cookies (cdr cookies)
- chunk (format "%s=%s" (url-cookie-name cur) (url-cookie-value cur))
- retval (if (< 80 (+ (length retval) (length chunk) 4))
- (concat retval "\r\nCookie: " chunk)
- (if retval
- (concat retval "; " chunk)
- (concat "Cookie: " chunk)))))
- (if retval
- (concat retval "\r\n")
- "")))
-
- (defvar url-cookie-two-dot-domains
- (concat "\\.\\("
- (mapconcat 'identity (list "com" "edu" "net" "org" "gov" "mil" "int")
- "\\|")
- "\\)$")
- "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 "\\." host 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) ; Not enough dots in domain name!
- nil)
- (t
- (string-match (concat (regexp-quote domain) "$") host)))))
-
- (defun url-header-comparison (x y)
- (string= (downcase x) (downcase y)))
-
- ;;;###autoload
- (defun url-cookie-handle-set-cookie (str)
- (let* ((args (mm-parse-args str nil t)) ; Don't downcase names
- (case-fold-search t)
- (secure (and (assoc* "secure" args :test 'url-header-comparison) t))
- (domain (or (cdr-safe (assoc* "domain" args :test
- 'url-header-comparison))
- (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* "expires" args :test
- 'url-header-comparison)))
- (path (or (cdr-safe (assoc* "path" args :test
- 'url-header-comparison))
- (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 (url-match expires 1) " "
- (url-match expires 2) " "
- (url-match expires 3) " "
- (url-match expires 4) " ["
- (url-match expires 5) "]")))
- (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)
- ((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 path secure))))
- (t
- (message "%s tried to set a cookie for domain %s - rejected."
- (url-host url-current-object) domain)))))
-
- (provide 'url-cookie)
-