lisp/url/url-cookie.el

   1 ;;; url-cookie.el --- URL cookie support
   2
   3 ;; Copyright (C) 1996-1999, 2004-2014 Free Software Foundation, Inc.
   4
   5 ;; Keywords: comm, data, processes, hypermedia
   6
   7 ;; This file is part of GNU Emacs.
   8 ;;
   9 ;; GNU Emacs is free software: you can redistribute it and/or modify
  10 ;; it under the terms of the GNU General Public License as published by
  11 ;; the Free Software Foundation, either version 3 of the License, or
  12 ;; (at your option) any later version.
  13
  14 ;; GNU Emacs is distributed in the hope that it will be useful,
  15 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  16 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  17 ;; GNU General Public License for more details.
  18
  19 ;; You should have received a copy of the GNU General Public License
  20 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  21
  22 ;;; Commentary:
  23
  24 ;;; Code:
  25
  26 (require 'url-util)
  27 (require 'url-parse)
  28 (require 'url-domsuf)
  29
  30 (eval-when-compile (require 'cl-lib))
  31
  32 (defgroup url-cookie nil
  33   "URL cookies."
  34   :prefix "url-"
  35   :prefix "url-cookie-"
  36   :group 'url)
  37
  38 ;; A cookie is stored internally as a vector of 7 slots
  39 ;; [ url-cookie NAME VALUE EXPIRES LOCALPART DOMAIN SECURE ]
  40
  41 (cl-defstruct (url-cookie
  42             (:constructor url-cookie-create)
  43             (:copier nil)
  44             (:type vector)
  45             :named)
  46   name value expires localpart domain secure)
  47
  48 (defvar url-cookie-storage nil         "Where cookies are stored.")
  49 (defvar url-cookie-secure-storage nil  "Where secure cookies are stored.")
  50 (defcustom url-cookie-file nil
  51   "File where cookies are stored on disk."
  52   :type '(choice (const :tag "Default" :value nil) file)
  53   :group 'url-file
  54   :group 'url-cookie)
  55
  56 (defcustom url-cookie-confirmation nil
  57   "If non-nil, confirmation by the user is required to accept HTTP cookies."
  58   :type 'boolean
  59   :group 'url-cookie)
  60
  61 (defcustom url-cookie-multiple-line nil
  62   "If nil, HTTP requests put all cookies for the server on one line.
  63 Some web servers, such as http://www.hotmail.com/, only accept cookies
  64 when they are on one line.  This is broken behavior, but just try
  65 telling Microsoft that."
  66   :type 'boolean
  67   :group 'url-cookie)
  68
  69 (defvar url-cookies-changed-since-last-save nil
  70   "Whether the cookies list has changed since the last save operation.")
  71
  72 (defun url-cookie-parse-file (&optional fname)
  73   "Load FNAME, default `url-cookie-file'."
  74   ;; It's completely normal for the cookies file not to exist yet.
  75   (load (or fname url-cookie-file) t t))
  76
  77 (defun url-cookie-clean-up (&optional secure)
  78   (let ((var (if secure 'url-cookie-secure-storage 'url-cookie-storage))
  79         new new-cookies)
  80     (dolist (cur (symbol-value var))
  81       (setq new-cookies nil)
  82       (dolist (cur-cookie (cdr cur))
  83         (or (not (url-cookie-p cur-cookie))
  84             (url-cookie-expired-p cur-cookie)
  85             (null (url-cookie-expires cur-cookie))
  86             (setq new-cookies (cons cur-cookie new-cookies))))
  87       (when new-cookies
  88         (setcdr cur new-cookies)
  89         (setq new (cons cur new))))
  90     (set var new)))
  91
  92 (defun url-cookie-write-file (&optional fname)
  93   (when url-cookies-changed-since-last-save
  94     (or fname (setq fname (expand-file-name url-cookie-file)))
  95     (if (condition-case nil
  96             (progn
  97               (url-make-private-file fname)
  98               nil)
  99           (error t))
 100         (message "Error accessing cookie file `%s'" fname)
 101     (url-cookie-clean-up)
 102     (url-cookie-clean-up t)
 103     (with-temp-buffer
 104       (insert ";; Emacs-W3 HTTP cookies file\n"
 105               ";; Automatically generated file!!! DO NOT EDIT!!!\n\n"
 106               "(setq url-cookie-storage\n '")
 107       (pp url-cookie-storage (current-buffer))
 108       (insert ")\n(setq url-cookie-secure-storage\n '")
 109       (pp url-cookie-secure-storage (current-buffer))
 110       (insert ")\n")
 111       (insert "\f\n;; Local Variables:\n"
 112               ";; version-control: never\n"
 113               ";; no-byte-compile: t\n"
 114               ";; End:\n")
 115       (set (make-local-variable 'version-control) 'never)
 116       (write-file fname))
 117     (setq url-cookies-changed-since-last-save nil))))
 118
 119 (defun url-cookie-store (name value &optional expires domain localpart secure)
 120   "Store a cookie."
 121   (let ((storage (if secure url-cookie-secure-storage url-cookie-storage))
 122         tmp found-domain)
 123     ;; First, look for a matching domain.
 124     (if (setq found-domain (assoc domain storage))
 125         ;; Need to either stick the new cookie in existing domain storage
 126         ;; or possibly replace an existing cookie if the names match.
 127         (unless (dolist (cur (setq storage (cdr found-domain)) tmp)
 128                   (and (equal localpart (url-cookie-localpart cur))
 129                        (equal name (url-cookie-name cur))
 130                        (progn
 131                          (setf (url-cookie-expires cur) expires)
 132                          (setf (url-cookie-value cur) value)
 133                          (setq tmp t))))
 134           ;; New cookie.
 135           (setcdr found-domain (cons
 136                                 (url-cookie-create :name name
 137                                                    :value value
 138                                                    :expires expires
 139                                                    :domain domain
 140                                                    :localpart localpart
 141                                                    :secure secure)
 142                                 (cdr found-domain))))
 143       ;; Need to add a new top-level domain.
 144       (setq tmp (url-cookie-create :name name
 145                                    :value value
 146                                    :expires expires
 147                                    :domain domain
 148                                    :localpart localpart
 149                                    :secure secure))
 150       (cond (storage
 151              (setcdr storage (cons (list domain tmp) (cdr storage))))
 152             (secure
 153              (setq url-cookie-secure-storage (list (list domain tmp))))
 154             (t
 155              (setq url-cookie-storage (list (list domain tmp))))))))
 156
 157 (defun url-cookie-expired-p (cookie)
 158   "Return non-nil if COOKIE is expired."
 159   (let ((exp (url-cookie-expires cookie)))
 160     (and (> (length exp) 0)
 161          (> (float-time) (float-time (date-to-time exp))))))
 162
 163 (defun url-cookie-retrieve (host &optional localpart secure)
 164   "Retrieve all cookies for a specified HOST and LOCALPART."
 165   (let ((storage (if secure
 166                      (append url-cookie-secure-storage url-cookie-storage)
 167                    url-cookie-storage))
 168         (case-fold-search t)
 169         cookies retval localpart-match)
 170     (dolist (cur storage)
 171       (setq cookies (cdr cur))
 172       (if (and (car cur)
 173                (string-match
 174                 (concat "^.*"
 175                         (regexp-quote
 176                          ;; Remove the dot from wildcard domains
 177                          ;; before matching.
 178                          (if (eq ?. (aref (car cur) 0))
 179                              (substring (car cur) 1)
 180                            (car cur)))
 181                         "$") host))
 182           ;; The domains match - a possible hit!
 183           (dolist (cur cookies)
 184             (and (if (and (stringp
 185                            (setq localpart-match (url-cookie-localpart cur)))
 186                           (stringp localpart))
 187                      (string-match (concat "^" (regexp-quote localpart-match))
 188                                    localpart)
 189                    (equal localpart localpart-match))
 190                  (not (url-cookie-expired-p cur))
 191                  (setq retval (cons cur retval))))))
 192     retval))
 193
 194 (defun url-cookie-generate-header-lines (host localpart secure)
 195   (let ((cookies (url-cookie-retrieve host localpart secure))
 196         retval chunk)
 197     ;; Have to sort this for sending most specific cookies first.
 198     (setq cookies (and cookies
 199                        (sort cookies
 200                              (lambda (x y)
 201                                (> (length (url-cookie-localpart x))
 202                                   (length (url-cookie-localpart y)))))))
 203     (dolist (cur cookies)
 204       (setq chunk (format "%s=%s" (url-cookie-name cur) (url-cookie-value cur))
 205             retval (if (and url-cookie-multiple-line
 206                             (< 80 (+ (length retval) (length chunk) 4)))
 207                        (concat retval "\r\nCookie: " chunk)
 208                      (if retval
 209                          (concat retval "; " chunk)
 210                        (concat "Cookie: " chunk)))))
 211     (if retval
 212         (concat retval "\r\n")
 213       "")))
 214
 215 (defcustom url-cookie-trusted-urls nil
 216   "A list of regular expressions matching URLs to always accept cookies from."
 217   :type '(repeat regexp)
 218   :group 'url-cookie)
 219
 220 (defcustom url-cookie-untrusted-urls nil
 221   "A list of regular expressions matching URLs to never accept cookies from."
 222   :type '(repeat regexp)
 223   :group 'url-cookie)
 224
 225 (defun url-cookie-host-can-set-p (host domain)
 226   (let ((last nil)
 227         (case-fold-search t))
 228     (if (string= host domain)   ; Apparently netscape lets you do this
 229         t
 230       ;; Remove the dot from wildcard domains before matching.
 231       (when (eq ?. (aref domain 0))
 232         (setq domain (substring domain 1)))
 233       (and (url-domsuf-cookie-allowed-p domain)
 234            ;; Need to check and make sure the host is actually _in_ the
 235            ;; domain it wants to set a cookie for though.
 236            (string-match (concat (regexp-quote domain)
 237                                  "$") host)))))
 238
 239 (defun url-cookie-handle-set-cookie (str)
 240   (setq url-cookies-changed-since-last-save t)
 241   (let* ((args (url-parse-args str t))
 242          (case-fold-search t)
 243          (secure (and (assoc-string "secure" args t) t))
 244          (domain (or (cdr-safe (assoc-string "domain" args t))
 245                      (url-host url-current-object)))
 246          (current-url (url-view-url t))
 247          (trusted url-cookie-trusted-urls)
 248          (untrusted url-cookie-untrusted-urls)
 249          (expires (cdr-safe (assoc-string "expires" args t)))
 250          (localpart (or (cdr-safe (assoc-string "path" args t))
 251                         (file-name-directory
 252                          (url-filename url-current-object))))
 253          (rest nil))
 254     (dolist (this args)
 255       (or (member (downcase (car this)) '("secure" "domain" "expires" "path"))
 256           (setq rest (cons this rest))))
 257
 258     ;; Sometimes we get dates that the timezone package cannot handle very
 259     ;; gracefully - take care of this here, instead of in url-cookie-expired-p
 260     ;; to speed things up.
 261     (and expires
 262          (string-match
 263           (concat "^[^,]+, +\\(..\\)-\\(...\\)-\\(..\\) +"
 264                   "\\(..:..:..\\) +\\[*\\([^\]]+\\)\\]*$")
 265           expires)
 266          (setq expires (concat (match-string 1 expires) " "
 267                                (match-string 2 expires) " "
 268                                (match-string 3 expires) " "
 269                                (match-string 4 expires) " ["
 270                                (match-string 5 expires) "]")))
 271
 272     ;; This one is for older Emacs/XEmacs variants that don't
 273     ;; understand this format without tenths of a second in it.
 274     ;; Wednesday, 30-Dec-2037 16:00:00 GMT
 275     ;;       - vs -
 276     ;; Wednesday, 30-Dec-2037 16:00:00.00 GMT
 277     (and expires
 278          (string-match
 279           "\\([0-9]+\\)-\\([A-Za-z]+\\)-\\([0-9]+\\)[ \t]+\\([0-9]+:[0-9]+:[0-9]+\\)\\(\\.[0-9]+\\)*[ \t]+\\([-+a-zA-Z0-9]+\\)"
 280           expires)
 281          (setq expires (concat (match-string 1 expires) "-"     ; day
 282                                (match-string 2 expires) "-"     ; month
 283                                (match-string 3 expires) " "     ; year
 284                                (match-string 4 expires) ".00 " ; hour:minutes:seconds
 285                                (match-string 6 expires)))) ":" ; timezone
 286
 287     (while (consp trusted)
 288       (if (string-match (car trusted) current-url)
 289           (setq trusted (- (match-end 0) (match-beginning 0)))
 290         (pop trusted)))
 291     (while (consp untrusted)
 292       (if (string-match (car untrusted) current-url)
 293           (setq untrusted (- (match-end 0) (match-beginning 0)))
 294         (pop untrusted)))
 295     (and trusted untrusted
 296          ;; Choose the more specific match.
 297          (set (if (> trusted untrusted) 'untrusted 'trusted) nil))
 298     (cond
 299      (untrusted
 300       ;; The site was explicitly marked as untrusted by the user.
 301       nil)
 302      ((or (eq url-privacy-level 'paranoid)
 303           (and (listp url-privacy-level) (memq 'cookies url-privacy-level)))
 304       ;; User never wants cookies.
 305       nil)
 306      ((and url-cookie-confirmation
 307            (not trusted)
 308            (save-window-excursion
 309              (with-output-to-temp-buffer "*Cookie Warning*"
 310                (dolist (x rest)
 311                  (princ (format "%s - %s" (car x) (cdr x)))))
 312              (prog1
 313                  (not (funcall url-confirmation-func
 314                                (format "Allow %s to set these cookies? "
 315                                        (url-host url-current-object))))
 316                (if (get-buffer "*Cookie Warning*")
 317                    (kill-buffer "*Cookie Warning*")))))
 318       ;; User wants to be asked, and declined.
 319       nil)
 320      ((url-cookie-host-can-set-p (url-host url-current-object) domain)
 321       ;; Cookie is accepted by the user, and passes our security checks.
 322       (dolist (cur rest)
 323         (url-cookie-store (car cur) (cdr cur) expires domain localpart secure)))
 324      (t
 325       (url-lazy-message "%s tried to set a cookie for domain %s - rejected."
 326                         (url-host url-current-object) domain)))))
 327
 328 (defvar url-cookie-timer nil)
 329
 330 (defcustom url-cookie-save-interval 3600
 331   "The number of seconds between automatic saves of cookies.
 332 Default is 1 hour.  Note that if you change this variable outside of
 333 the `customize' interface after `url-do-setup' has been run, you need
 334 to run the `url-cookie-setup-save-timer' function manually."
 335   :set #'(lambda (var val)
 336            (set-default var val)
 337            (if (bound-and-true-p url-setup-done)
 338                (url-cookie-setup-save-timer)))
 339   :type 'integer
 340   :group 'url-cookie)
 341
 342 (defun url-cookie-setup-save-timer ()
 343   "Reset the cookie saver timer."
 344   (interactive)
 345   (ignore-errors (cancel-timer url-cookie-timer))
 346   (setq url-cookie-timer nil)
 347   (if url-cookie-save-interval
 348       (setq url-cookie-timer (run-at-time url-cookie-save-interval
 349                                           url-cookie-save-interval
 350                                           #'url-cookie-write-file))))
 351
 352 ;;; Mode for listing and editing cookies.
 353
 354 (defun url-cookie-list ()
 355   "Display a buffer listing the current URL cookies, if there are any.
 356 Use \\<url-cookie-mode-map>\\\[url-cookie-delete] to remove cookies."
 357   (interactive)
 358   (when (and (null url-cookie-secure-storage)
 359              (null url-cookie-storage))
 360     (error "No cookies are defined"))
 361
 362   (pop-to-buffer "*url cookies*")
 363   (let ((inhibit-read-only t)
 364         (domains (sort
 365                   (copy-sequence
 366                    (append url-cookie-secure-storage
 367                            url-cookie-storage))
 368                   (lambda (e1 e2)
 369                     (string< (car e1) (car e2)))))
 370         (domain-length 0)
 371         start name format domain)
 372     (erase-buffer)
 373     (url-cookie-mode)
 374     (dolist (elem domains)
 375       (setq domain-length (max domain-length (length (car elem)))))
 376     (setq format (format "%%-%ds %%-20s %%s" domain-length)
 377           header-line-format
 378           (concat " " (format format "Domain" "Name" "Value")))
 379     (dolist (elem domains)
 380       (setq domain (car elem))
 381       (dolist (cookie (sort (copy-sequence (cdr elem))
 382                             (lambda (c1 c2)
 383                               (string< (url-cookie-name c1)
 384                                        (url-cookie-name c2)))))
 385         (setq start (point)
 386               name (url-cookie-name cookie))
 387         (when (> (length name) 20)
 388           (setq name (substring name 0 20)))
 389         (insert (format format domain name
 390                         (url-cookie-value cookie))
 391                 "\n")
 392         (setq domain "")
 393         (put-text-property start (1+ start) 'url-cookie cookie)))
 394     (goto-char (point-min))))
 395
 396 (defun url-cookie-delete ()
 397   "Delete the cookie on the current line."
 398   (interactive)
 399   (let ((cookie (get-text-property (line-beginning-position) 'url-cookie))
 400         (inhibit-read-only t)
 401         variable)
 402     (unless cookie
 403       (error "No cookie on the current line"))
 404     (setq variable (if (url-cookie-secure cookie)
 405                        'url-cookie-secure-storage
 406                      'url-cookie-storage))
 407     (let* ((list (symbol-value variable))
 408            (elem (assoc (url-cookie-domain cookie) list)))
 409       (setq elem (delq cookie elem))
 410       (when (zerop (length (cdr elem)))
 411         (setq list (delq elem list)))
 412       (set variable list))
 413     (setq url-cookies-changed-since-last-save t)
 414     (url-cookie-write-file)
 415     (delete-region (line-beginning-position)
 416                    (progn
 417                      (forward-line 1)
 418                      (point)))))
 419
 420 (defun url-cookie-quit ()
 421   "Kill the current buffer."
 422   (interactive)
 423   (kill-buffer (current-buffer)))
 424
 425 (defvar url-cookie-mode-map
 426   (let ((map (make-sparse-keymap)))
 427     (suppress-keymap map)
 428     (define-key map "q" 'url-cookie-quit)
 429     (define-key map [delete] 'url-cookie-delete)
 430     (define-key map [(control k)] 'url-cookie-delete)
 431     map))
 432
 433 (define-derived-mode url-cookie-mode nil "URL Cookie"
 434   "Mode for listing cookies.
 435
 436 \\{url-cookie-mode-map}"
 437   (buffer-disable-undo)
 438   (setq buffer-read-only t
 439         truncate-lines t))
 440
 441 (provide 'url-cookie)
 442
 443 ;;; url-cookie.el ends here