lisp/gnus/mm-view.el

   1 ;;; mm-view.el --- functions for viewing MIME objects
   2
   3 ;; Copyright (C) 1998-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;; This file is part of GNU Emacs.
   7
   8 ;; GNU Emacs is free software: you can redistribute it and/or modify
   9 ;; it under the terms of the GNU General Public License as published by
  10 ;; the Free Software Foundation, either version 3 of the License, or
  11 ;; (at your option) any later version.
  12
  13 ;; GNU Emacs is distributed in the hope that it will be useful,
  14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  16 ;; GNU General Public License for more details.
  17
  18 ;; You should have received a copy of the GNU General Public License
  19 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  20
  21 ;;; Commentary:
  22
  23 ;;; Code:
  24
  25 ;; For Emacs <22.2 and XEmacs.
  26 (eval-and-compile
  27   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  28 (eval-when-compile (require 'cl))
  29 (require 'mail-parse)
  30 (require 'mailcap)
  31 (require 'mm-bodies)
  32 (require 'mm-decode)
  33 (require 'smime)
  34 (require 'mml-smime)
  35
  36 (autoload 'gnus-completing-read "gnus-util")
  37 (autoload 'gnus-window-inside-pixel-edges "gnus-ems")
  38 (autoload 'gnus-article-prepare-display "gnus-art")
  39 (autoload 'vcard-parse-string "vcard")
  40 (autoload 'vcard-format-string "vcard")
  41 (autoload 'fill-flowed "flow-fill")
  42 (autoload 'html2text "html2text" nil t)
  43
  44 (defvar gnus-article-mime-handles)
  45 (defvar gnus-newsgroup-charset)
  46 (defvar smime-keys)
  47 (defvar w3m-cid-retrieve-function-alist)
  48 (defvar w3m-current-buffer)
  49 (defvar w3m-display-inline-images)
  50 (defvar w3m-minor-mode-map)
  51
  52 (defvar mm-text-html-renderer-alist
  53   '((shr . mm-shr)
  54     (w3 . mm-inline-text-html-render-with-w3)
  55     (w3m . mm-inline-text-html-render-with-w3m)
  56     (w3m-standalone . mm-inline-text-html-render-with-w3m-standalone)
  57     (gnus-w3m . gnus-article-html)
  58     (links mm-inline-render-with-file
  59            mm-links-remove-leading-blank
  60            "links" "-dump" file)
  61     (lynx mm-inline-render-with-stdin nil
  62           "lynx" "-dump" "-force_html" "-stdin" "-nolist")
  63     (html2text mm-inline-render-with-function html2text))
  64   "The attributes of renderer types for text/html.")
  65
  66 (defcustom mm-fill-flowed t
  67   "If non-nil a format=flowed article will be displayed flowed."
  68   :type 'boolean
  69   :version "22.1"
  70   :group 'mime-display)
  71
  72 (defcustom mm-inline-large-images-proportion 0.9
  73   "Maximum proportion of large image resized when
  74 `mm-inline-large-images' is set to resize."
  75   :type 'float
  76   :version "24.1"
  77   :group 'mime-display)
  78
  79 ;;; Internal variables.
  80
  81 ;;;
  82 ;;; Functions for displaying various formats inline
  83 ;;;
  84
  85 (autoload 'gnus-rescale-image "gnus-util")
  86
  87 (defun mm-inline-image-emacs (handle)
  88   (let ((b (point-marker))
  89         (inhibit-read-only t))
  90     (put-image
  91      (let ((image (mm-get-image handle)))
  92        (if (eq mm-inline-large-images 'resize)
  93            (gnus-rescale-image
  94             image
  95             (let ((edges (gnus-window-inside-pixel-edges
  96                           (get-buffer-window (current-buffer)))))
  97               (cons (truncate (* mm-inline-large-images-proportion
  98                                  (- (nth 2 edges) (nth 0 edges))))
  99                     (truncate (* mm-inline-large-images-proportion
 100                                  (- (nth 3 edges) (nth 1 edges)))))))
 101          image))
 102      b)
 103     (insert "\n\n")
 104     (mm-handle-set-undisplayer
 105      handle
 106      `(lambda ()
 107         (let ((b ,b)
 108               (inhibit-read-only t))
 109           (remove-images b b)
 110           (delete-region b (+ b 2)))))))
 111
 112 (defun mm-inline-image-xemacs (handle)
 113   (when (featurep 'xemacs)
 114     (insert "\n\n")
 115     (forward-char -2)
 116     (let ((annot (make-annotation (mm-get-image handle) nil 'text))
 117         (inhibit-read-only t))
 118       (mm-handle-set-undisplayer
 119        handle
 120        `(lambda ()
 121           (let ((b ,(point-marker))
 122               (inhibit-read-only t))
 123             (delete-annotation ,annot)
 124             (delete-region (- b 2) b))))
 125       (set-extent-property annot 'mm t)
 126       (set-extent-property annot 'duplicable t))))
 127
 128 (eval-and-compile
 129   (if (featurep 'xemacs)
 130       (defalias 'mm-inline-image 'mm-inline-image-xemacs)
 131     (defalias 'mm-inline-image 'mm-inline-image-emacs)))
 132
 133 ;; External.
 134 (declare-function w3-do-setup       "ext:w3"         ())
 135 (declare-function w3-region         "ext:w3-display" (st nd))
 136 (declare-function w3-prepare-buffer "ext:w3-display" (&rest args))
 137
 138 (defvar mm-w3-setup nil)
 139 (defun mm-setup-w3 ()
 140   (unless mm-w3-setup
 141     (require 'w3)
 142     (w3-do-setup)
 143     (require 'url)
 144     (require 'w3-vars)
 145     (require 'url-vars)
 146     (setq mm-w3-setup t)))
 147
 148 (defun mm-inline-text-html-render-with-w3 (handle)
 149   (mm-setup-w3)
 150   (let ((text (mm-get-part handle))
 151         (b (point))
 152         (url-standalone-mode t)
 153         (url-gateway-unplugged t)
 154         (w3-honor-stylesheets nil)
 155         (url-current-object
 156          (url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
 157         (width (window-width))
 158         (charset (mail-content-type-get
 159                   (mm-handle-type handle) 'charset)))
 160     (save-excursion
 161       (insert (if charset (mm-decode-string text charset) text))
 162       (save-restriction
 163         (narrow-to-region b (point))
 164         (unless charset
 165           (goto-char (point-min))
 166           (when (or (and (boundp 'w3-meta-content-type-charset-regexp)
 167                          (re-search-forward
 168                           w3-meta-content-type-charset-regexp nil t))
 169                     (and (boundp 'w3-meta-charset-content-type-regexp)
 170                          (re-search-forward
 171                           w3-meta-charset-content-type-regexp nil t)))
 172             (setq charset
 173                   (let ((bsubstr (buffer-substring-no-properties
 174                                   (match-beginning 2)
 175                                   (match-end 2))))
 176                     (if (fboundp 'w3-coding-system-for-mime-charset)
 177                         (w3-coding-system-for-mime-charset bsubstr)
 178                       (mm-charset-to-coding-system bsubstr))))
 179             (delete-region (point-min) (point-max))
 180             (insert (mm-decode-string text charset))))
 181         (save-window-excursion
 182           (save-restriction
 183             (let ((w3-strict-width width)
 184                   ;; Don't let w3 set the global version of
 185                   ;; this variable.
 186                   (fill-column fill-column))
 187               (if (or debug-on-error debug-on-quit)
 188                   (w3-region (point-min) (point-max))
 189                 (condition-case ()
 190                     (w3-region (point-min) (point-max))
 191                   (error
 192                    (delete-region (point-min) (point-max))
 193                    (let ((b (point))
 194                          (charset (mail-content-type-get
 195                                    (mm-handle-type handle) 'charset)))
 196                      (if (or (eq charset 'gnus-decoded)
 197                              (eq mail-parse-charset 'gnus-decoded))
 198                        (save-restriction
 199                          (narrow-to-region (point) (point))
 200                          (mm-insert-part handle)
 201                          (goto-char (point-max)))
 202                        (insert (mm-decode-string (mm-get-part handle)
 203                                                  charset))))
 204                    (message
 205                     "Error while rendering html; showing as text/plain")))))))
 206         (mm-handle-set-undisplayer
 207          handle
 208          `(lambda ()
 209             (let ((inhibit-read-only t))
 210               ,@(if (functionp 'remove-specifier)
 211                     '((dolist (prop '(background background-pixmap foreground))
 212                         (remove-specifier
 213                          (face-property 'default prop)
 214                          (current-buffer)))))
 215               (delete-region ,(point-min-marker)
 216                              ,(point-max-marker)))))))))
 217
 218 (defvar mm-w3m-setup nil
 219   "Whether gnus-article-mode has been setup to use emacs-w3m.")
 220
 221 ;; External.
 222 (declare-function w3m-detect-meta-charset "ext:w3m" ())
 223 (declare-function w3m-region "ext:w3m" (start end &optional url charset))
 224
 225 (defun mm-setup-w3m ()
 226   "Setup gnus-article-mode to use emacs-w3m."
 227   (unless mm-w3m-setup
 228     (require 'w3m)
 229     (unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
 230       (push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
 231             w3m-cid-retrieve-function-alist))
 232     (setq mm-w3m-setup t))
 233   (setq w3m-display-inline-images mm-inline-text-html-with-images))
 234
 235 (defun mm-w3m-cid-retrieve-1 (url handle)
 236   (dolist (elem handle)
 237     (when (consp elem)
 238       (when (equal url (mm-handle-id elem))
 239         (mm-insert-part elem)
 240         (throw 'found-handle (mm-handle-media-type elem)))
 241       (when (and (stringp (car elem))
 242                  (equal "multipart" (mm-handle-media-supertype elem)))
 243         (mm-w3m-cid-retrieve-1 url elem)))))
 244
 245 (defun mm-w3m-cid-retrieve (url &rest args)
 246   "Insert a content pointed by URL if it has the cid: scheme."
 247   (when (string-match "\\`cid:" url)
 248     (or (catch 'found-handle
 249           (mm-w3m-cid-retrieve-1
 250            (setq url (concat "<" (substring url (match-end 0)) ">"))
 251            (with-current-buffer w3m-current-buffer
 252              gnus-article-mime-handles)))
 253         (prog1
 254             nil
 255           (message "Failed to find \"Content-ID: %s\"" url)))))
 256
 257 (defun mm-inline-text-html-render-with-w3m (handle)
 258   "Render a text/html part using emacs-w3m."
 259   (mm-setup-w3m)
 260   (let ((text (mm-get-part handle))
 261         (b (point))
 262         (charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
 263                      mail-parse-charset)))
 264     (save-excursion
 265       (insert (if charset (mm-decode-string text charset) text))
 266       (save-restriction
 267         (narrow-to-region b (point))
 268         (unless charset
 269           (goto-char (point-min))
 270           (when (setq charset (w3m-detect-meta-charset))
 271             (delete-region (point-min) (point-max))
 272             (insert (mm-decode-string text charset))))
 273         (let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
 274               w3m-force-redisplay)
 275           (w3m-region (point-min) (point-max) nil charset))
 276         ;; Put the mark meaning this part was rendered by emacs-w3m.
 277         (put-text-property (point-min) (point-max)
 278                            'mm-inline-text-html-with-w3m t)
 279         (when (and mm-inline-text-html-with-w3m-keymap
 280                    (boundp 'w3m-minor-mode-map)
 281                    w3m-minor-mode-map)
 282           (if (and (boundp 'w3m-link-map)
 283                    w3m-link-map)
 284               (let* ((start (point-min))
 285                      (end (point-max))
 286                      (on (get-text-property start 'w3m-href-anchor))
 287                      (map (copy-keymap w3m-link-map))
 288                      next)
 289                 (set-keymap-parent map w3m-minor-mode-map)
 290                 (while (< start end)
 291                   (if on
 292                       (progn
 293                         (setq next (or (text-property-any start end
 294                                                           'w3m-href-anchor nil)
 295                                        end))
 296                         (put-text-property start next 'keymap map))
 297                     (setq next (or (text-property-not-all start end
 298                                                           'w3m-href-anchor nil)
 299                                    end))
 300                     (put-text-property start next 'keymap w3m-minor-mode-map))
 301                   (setq start next
 302                         on (not on))))
 303             (put-text-property (point-min) (point-max)
 304                                'keymap w3m-minor-mode-map)))
 305         (mm-handle-set-undisplayer
 306          handle
 307          `(lambda ()
 308             (let ((inhibit-read-only t))
 309               (delete-region ,(point-min-marker)
 310                              ,(point-max-marker)))))))))
 311
 312 (defvar mm-w3m-standalone-supports-m17n-p (if (featurep 'mule) 'undecided)
 313   "*T means the w3m command supports the m17n feature.")
 314
 315 (defun mm-w3m-standalone-supports-m17n-p ()
 316   "Say whether the w3m command supports the m17n feature."
 317   (cond ((eq mm-w3m-standalone-supports-m17n-p t) t)
 318         ((eq mm-w3m-standalone-supports-m17n-p nil) nil)
 319         ((not (featurep 'mule)) (setq mm-w3m-standalone-supports-m17n-p nil))
 320         ((condition-case nil
 321              (let ((coding-system-for-write 'iso-2022-jp)
 322                    (coding-system-for-read 'iso-2022-jp)
 323                    (str (mm-decode-coding-string "\
 324 \e$B#D#o#e#s!!#w#3#m!!#s#u#p#p#o#r#t!!#m#1#7#n!)\e(B" 'iso-2022-jp)))
 325                (mm-with-multibyte-buffer
 326                  (insert str)
 327                  (call-process-region
 328                   (point-min) (point-max) "w3m" t t nil "-dump"
 329                   "-T" "text/html" "-I" "iso-2022-jp" "-O" "iso-2022-jp")
 330                  (goto-char (point-min))
 331                  (search-forward str nil t)))
 332            (error nil))
 333          (setq mm-w3m-standalone-supports-m17n-p t))
 334         (t
 335          ;;(message "You had better upgrade your w3m command")
 336          (setq mm-w3m-standalone-supports-m17n-p nil))))
 337
 338 (defun mm-inline-text-html-render-with-w3m-standalone (handle)
 339   "Render a text/html part using w3m."
 340   (if (mm-w3m-standalone-supports-m17n-p)
 341       (let ((source (mm-get-part handle))
 342             (charset (or (mail-content-type-get (mm-handle-type handle)
 343                                                 'charset)
 344                          (symbol-name mail-parse-charset)))
 345             cs)
 346         (unless (and charset
 347                      (setq cs (mm-charset-to-coding-system charset))
 348                      (not (eq cs 'ascii)))
 349           ;; The default.
 350           (setq charset "iso-8859-1"
 351                 cs 'iso-8859-1))
 352         (mm-insert-inline
 353          handle
 354          (mm-with-unibyte-buffer
 355            (insert source)
 356            (mm-enable-multibyte)
 357            (let ((coding-system-for-write 'binary)
 358                  (coding-system-for-read cs))
 359              (call-process-region
 360               (point-min) (point-max)
 361               "w3m" t t nil "-dump" "-T" "text/html"
 362               "-I" charset "-O" charset))
 363            (buffer-string))))
 364     (mm-inline-render-with-stdin handle nil "w3m" "-dump" "-T" "text/html")))
 365
 366 (defun mm-links-remove-leading-blank ()
 367   ;; Delete the annoying three spaces preceding each line of links
 368   ;; output.
 369   (goto-char (point-min))
 370   (while (re-search-forward "^   " nil t)
 371     (delete-region (match-beginning 0) (match-end 0))))
 372
 373 (defun mm-inline-wash-with-file (post-func cmd &rest args)
 374   (let ((file (mm-make-temp-file
 375                (expand-file-name "mm" mm-tmp-directory))))
 376     (let ((coding-system-for-write 'binary))
 377       (write-region (point-min) (point-max) file nil 'silent))
 378     (delete-region (point-min) (point-max))
 379     (unwind-protect
 380         (apply 'call-process cmd nil t nil (mapcar 'eval args))
 381       (delete-file file))
 382     (and post-func (funcall post-func))))
 383
 384 (defun mm-inline-wash-with-stdin (post-func cmd &rest args)
 385   (let ((coding-system-for-write 'binary))
 386     (apply 'call-process-region (point-min) (point-max)
 387            cmd t t nil args))
 388   (and post-func (funcall post-func)))
 389
 390 (defun mm-inline-render-with-file (handle post-func cmd &rest args)
 391   (let ((source (mm-get-part handle)))
 392     (mm-insert-inline
 393      handle
 394      (mm-with-unibyte-buffer
 395        (insert source)
 396        (apply 'mm-inline-wash-with-file post-func cmd args)
 397        (buffer-string)))))
 398
 399 (defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
 400   (let ((source (mm-get-part handle)))
 401     (mm-insert-inline
 402      handle
 403      (mm-with-unibyte-buffer
 404        (insert source)
 405        (apply 'mm-inline-wash-with-stdin post-func cmd args)
 406        (buffer-string)))))
 407
 408 (defun mm-inline-render-with-function (handle func &rest args)
 409   (let ((source (mm-get-part handle))
 410         (charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
 411                      mail-parse-charset)))
 412     (mm-insert-inline
 413      handle
 414      (mm-with-multibyte-buffer
 415        (insert (if charset
 416                    (mm-decode-string source charset)
 417                  source))
 418        (apply func args)
 419        (buffer-string)))))
 420
 421 (defun mm-inline-text-html (handle)
 422   (let* ((func mm-text-html-renderer)
 423          (entry (assq func mm-text-html-renderer-alist))
 424          (inhibit-read-only t))
 425     (if entry
 426         (setq func (cdr entry)))
 427     (cond
 428      ((functionp func)
 429       (funcall func handle))
 430      (t
 431       (apply (car func) handle (cdr func))))))
 432
 433 (defun mm-inline-text-vcard (handle)
 434   (let ((inhibit-read-only t))
 435     (mm-insert-inline
 436      handle
 437      (concat "\n-- \n"
 438              (ignore-errors
 439                (if (fboundp 'vcard-pretty-print)
 440                    (vcard-pretty-print (mm-get-part handle))
 441                  (vcard-format-string
 442                   (vcard-parse-string (mm-get-part handle)
 443                                       'vcard-standard-filter))))))))
 444
 445 (defun mm-inline-text (handle)
 446   (let ((b (point))
 447         (type (mm-handle-media-subtype handle))
 448         (charset (mail-content-type-get
 449                   (mm-handle-type handle) 'charset))
 450         (inhibit-read-only t))
 451     (if (or (eq charset 'gnus-decoded)
 452             ;; This is probably not entirely correct, but
 453             ;; makes rfc822 parts with embedded multiparts work.
 454             (eq mail-parse-charset 'gnus-decoded))
 455         (save-restriction
 456           (narrow-to-region (point) (point))
 457           (mm-insert-part handle)
 458           (goto-char (point-max)))
 459       (mm-display-inline-fontify handle))
 460     (when (and mm-fill-flowed
 461                (equal type "plain")
 462                (equal (cdr (assoc 'format (mm-handle-type handle)))
 463                       "flowed"))
 464       (save-restriction
 465         (narrow-to-region b (point))
 466         (goto-char b)
 467         (fill-flowed nil (equal (cdr (assoc 'delsp (mm-handle-type handle)))
 468                                 "yes"))
 469         (goto-char (point-max))))
 470     (save-restriction
 471       (narrow-to-region b (point))
 472       (when (member type '("enriched" "richtext"))
 473         (set-text-properties (point-min) (point-max) nil)
 474         (ignore-errors
 475           (enriched-decode (point-min) (point-max))))
 476       (mm-handle-set-undisplayer
 477        handle
 478        `(lambda ()
 479           (let ((inhibit-read-only t))
 480             (delete-region ,(point-min-marker)
 481                            ,(point-max-marker))))))))
 482
 483 (defun mm-insert-inline (handle text)
 484   "Insert TEXT inline from HANDLE."
 485   (let ((b (point)))
 486     (insert text)
 487     (unless (bolp)
 488       (insert "\n"))
 489     (mm-handle-set-undisplayer
 490      handle
 491      `(lambda ()
 492         (let ((inhibit-read-only t))
 493           (delete-region ,(copy-marker b)
 494                          ,(copy-marker (point))))))))
 495
 496 (defun mm-inline-audio (handle)
 497   (message "Not implemented"))
 498
 499 (defun mm-w3-prepare-buffer ()
 500   (require 'w3)
 501   (let ((url-standalone-mode t)
 502         (url-gateway-unplugged t)
 503         (w3-honor-stylesheets nil))
 504     (w3-prepare-buffer)))
 505
 506 (defun mm-view-message ()
 507   (mm-enable-multibyte)
 508   (let (handles)
 509     (let (gnus-article-mime-handles)
 510       ;; Double decode problem may happen.  See mm-inline-message.
 511       (run-hooks 'gnus-article-decode-hook)
 512       (gnus-article-prepare-display)
 513       (setq handles gnus-article-mime-handles))
 514     (when handles
 515       (setq gnus-article-mime-handles
 516             (mm-merge-handles gnus-article-mime-handles handles))))
 517   (fundamental-mode)
 518   (goto-char (point-min)))
 519
 520 (defun mm-inline-message (handle)
 521   (let ((b (point))
 522         (bolp (bolp))
 523         (charset (mail-content-type-get
 524                   (mm-handle-type handle) 'charset))
 525         gnus-displaying-mime handles)
 526     (when (and charset
 527                (stringp charset))
 528       (setq charset (intern (downcase charset)))
 529       (when (eq charset 'us-ascii)
 530         (setq charset nil)))
 531     (save-excursion
 532       (save-restriction
 533         (narrow-to-region b b)
 534         (mm-insert-part handle)
 535         (let (gnus-article-mime-handles
 536               ;; disable prepare hook
 537               gnus-article-prepare-hook
 538               (gnus-newsgroup-charset
 539                (unless (eq charset 'gnus-decoded) ;; mm-uu might set it.
 540                  (or charset gnus-newsgroup-charset))))
 541           (let ((gnus-original-article-buffer (mm-handle-buffer handle)))
 542             (run-hooks 'gnus-article-decode-hook))
 543           (gnus-article-prepare-display)
 544           (setq handles gnus-article-mime-handles))
 545         (goto-char (point-min))
 546         (unless bolp
 547           (insert "\n"))
 548         (goto-char (point-max))
 549         (unless (bolp)
 550           (insert "\n"))
 551         (insert "----------\n\n")
 552         (when handles
 553           (setq gnus-article-mime-handles
 554                 (mm-merge-handles gnus-article-mime-handles handles)))
 555         (mm-handle-set-undisplayer
 556          handle
 557          `(lambda ()
 558             (let ((inhibit-read-only t))
 559               (if (fboundp 'remove-specifier)
 560                   ;; This is only valid on XEmacs.
 561                   (dolist (prop '(background background-pixmap foreground))
 562                     (remove-specifier
 563                      (face-property 'default prop) (current-buffer))))
 564               (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
 565
 566 ;; Shut up byte-compiler.
 567 (defvar font-lock-mode-hook)
 568 (defun mm-display-inline-fontify (handle &optional mode)
 569   "Insert HANDLE inline fontifying with MODE.
 570 If MODE is not set, try to find mode automatically."
 571   (let ((charset (mail-content-type-get (mm-handle-type handle) 'charset))
 572         text coding-system)
 573     (unless (eq charset 'gnus-decoded)
 574       (mm-with-unibyte-buffer
 575         (mm-insert-part handle)
 576         (mm-decompress-buffer
 577          (mm-handle-filename handle)
 578          t t)
 579         (unless charset
 580           (setq coding-system (mm-find-buffer-file-coding-system)))
 581         (setq text (buffer-string))))
 582     ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
 583     ;; on for buffers whose name begins with " ".  That's why we use
 584     ;; `with-current-buffer'/`generate-new-buffer' rather than
 585     ;; `with-temp-buffer'.
 586     (with-current-buffer (generate-new-buffer "*fontification*")
 587       (buffer-disable-undo)
 588       (mm-enable-multibyte)
 589       (insert (cond ((eq charset 'gnus-decoded)
 590                      (with-current-buffer (mm-handle-buffer handle)
 591                        (buffer-string)))
 592                     (coding-system
 593                      (mm-decode-coding-string text coding-system))
 594                     (charset
 595                      (mm-decode-string text charset))
 596                     (t
 597                      text)))
 598       (require 'font-lock)
 599       ;; I find font-lock a bit too verbose.
 600       (let ((font-lock-verbose nil)
 601             (font-lock-support-mode nil))
 602         ;; Disable support modes, e.g., jit-lock, lazy-lock, etc.
 603         ;; Note: XEmacs people use `font-lock-mode-hook' to run those modes.
 604         (set (make-local-variable 'font-lock-mode-hook) nil)
 605         (setq buffer-file-name (mm-handle-filename handle))
 606         (set (make-local-variable 'enable-local-variables) nil)
 607         (with-demoted-errors
 608           (if mode
 609               (funcall mode)
 610             (let ((auto-mode-alist
 611                    (delq (rassq 'doc-view-mode-maybe auto-mode-alist)
 612                          (copy-sequence auto-mode-alist))))
 613               (set-auto-mode)))
 614           ;; The mode function might have already turned on font-lock.
 615           ;; Do not fontify if the guess mode is fundamental.
 616           (unless (or (symbol-value 'font-lock-mode)
 617                       (eq major-mode 'fundamental-mode))
 618             (font-lock-fontify-buffer))))
 619       ;; By default, XEmacs font-lock uses non-duplicable text
 620       ;; properties.  This code forces all the text properties
 621       ;; to be copied along with the text.
 622       (when (featurep 'xemacs)
 623         (map-extents (lambda (ext ignored)
 624                        (set-extent-property ext 'duplicable t)
 625                        nil)
 626                      nil nil nil nil nil 'text-prop))
 627       (setq text (buffer-string))
 628       ;; Set buffer unmodified to avoid confirmation when killing the
 629       ;; buffer.
 630       (set-buffer-modified-p nil)
 631       (kill-buffer (current-buffer)))
 632     (mm-insert-inline handle text)))
 633
 634 ;; Shouldn't these functions check whether the user even wants to use
 635 ;; font-lock?  At least under XEmacs, this fontification is pretty
 636 ;; much unconditional.  Also, it would be nice to change for the size
 637 ;; of the fontified region.
 638
 639 (defun mm-display-patch-inline (handle)
 640   (mm-display-inline-fontify handle 'diff-mode))
 641
 642 (defun mm-display-elisp-inline (handle)
 643   (mm-display-inline-fontify handle 'emacs-lisp-mode))
 644
 645 (defun mm-display-dns-inline (handle)
 646   (mm-display-inline-fontify handle 'dns-mode))
 647
 648 (defun mm-display-org-inline (handle)
 649   "Show an Org mode text from HANDLE inline."
 650   (mm-display-inline-fontify handle 'org-mode))
 651
 652 (defun mm-display-shell-script-inline (handle)
 653   "Show a shell script from HANDLE inline."
 654   (mm-display-inline-fontify handle 'shell-script-mode))
 655
 656 (defun mm-display-javascript-inline (handle)
 657   "Show JavsScript code from HANDLE inline."
 658   (mm-display-inline-fontify handle 'javascript-mode))
 659
 660 ;;      id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 661 ;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
 662 (defvar mm-pkcs7-signed-magic
 663   "\x30\x5c\x28\x80\x5c\x7c\x81\x2e\x5c\x7c\x82\x2e\x2e\x5c\x7c\x83\x2e\x2e\
 664 \x2e\x5c\x29\x06\x09\x5c\x2a\x86\x48\x86\xf7\x0d\x01\x07\x02")
 665
 666 ;;      id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 667 ;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
 668 (defvar mm-pkcs7-enveloped-magic
 669   "\x30\x5c\x28\x80\x5c\x7c\x81\x2e\x5c\x7c\x82\x2e\x2e\x5c\x7c\x83\x2e\x2e\
 670 \x2e\x5c\x29\x06\x09\x5c\x2a\x86\x48\x86\xf7\x0d\x01\x07\x03")
 671
 672 (defun mm-view-pkcs7-get-type (handle)
 673   (mm-with-unibyte-buffer
 674     (mm-insert-part handle)
 675     (cond ((looking-at mm-pkcs7-enveloped-magic)
 676            'enveloped)
 677           ((looking-at mm-pkcs7-signed-magic)
 678            'signed)
 679           (t
 680            (error "Could not identify PKCS#7 type")))))
 681
 682 (defun mm-view-pkcs7 (handle &optional from)
 683   (case (mm-view-pkcs7-get-type handle)
 684     (enveloped (mm-view-pkcs7-decrypt handle from))
 685     (signed (mm-view-pkcs7-verify handle))
 686     (otherwise (error "Unknown or unimplemented PKCS#7 type"))))
 687
 688 (defun mm-view-pkcs7-verify (handle)
 689   (let ((verified nil))
 690     (with-temp-buffer
 691       (insert "MIME-Version: 1.0\n")
 692       (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
 693       (insert-buffer-substring (mm-handle-buffer handle))
 694       (setq verified (smime-verify-region (point-min) (point-max))))
 695     (goto-char (point-min))
 696     (mm-insert-part handle)
 697     (if (search-forward "Content-Type: " nil t)
 698         (delete-region (point-min) (match-beginning 0)))
 699     (goto-char (point-max))
 700     (if (re-search-backward "--\r?\n?" nil t)
 701         (delete-region (match-end 0) (point-max)))
 702     (unless verified
 703       (insert-buffer-substring smime-details-buffer)))
 704   (goto-char (point-min))
 705   (while (search-forward "\r\n" nil t)
 706     (replace-match "\n"))
 707   t)
 708
 709 (defun mm-view-pkcs7-decrypt (handle &optional from)
 710   (insert-buffer-substring (mm-handle-buffer handle))
 711   (goto-char (point-min))
 712   (if (eq mml-smime-use 'epg)
 713       ;; Use EPG/gpgsm
 714       (let ((part (base64-decode-string (buffer-string))))
 715         (erase-buffer)
 716         (insert (epg-decrypt-string (epg-make-context 'CMS) part)))
 717     ;; Use openssl
 718     (insert "MIME-Version: 1.0\n")
 719     (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
 720     (smime-decrypt-region
 721      (point-min) (point-max)
 722      (if (= (length smime-keys) 1)
 723          (cadar smime-keys)
 724        (smime-get-key-by-email
 725         (gnus-completing-read
 726          "Decipher using key"
 727          smime-keys nil nil nil (car-safe (car-safe smime-keys)))))
 728      from))
 729   (goto-char (point-min))
 730   (while (search-forward "\r\n" nil t)
 731     (replace-match "\n"))
 732   (goto-char (point-min)))
 733
 734 (provide 'mm-view)
 735
 736 ;;; mm-view.el ends here