lisp/gnus/mm-view.el

   1 ;;; mm-view.el --- functions for viewing MIME objects
   2
   3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
   4 ;;   2005, 2006, 2007 Free Software Foundation, Inc.
   5
   6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   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, or (at your option)
  12 ;; 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; see the file COPYING.  If not, write to the
  21 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
  22 ;; Boston, MA 02110-1301, USA.
  23
  24 ;;; Commentary:
  25
  26 ;;; Code:
  27
  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
  35 (eval-and-compile
  36   (autoload 'gnus-article-prepare-display "gnus-art")
  37   (autoload 'vcard-parse-string "vcard")
  38   (autoload 'vcard-format-string "vcard")
  39   (autoload 'fill-flowed "flow-fill")
  40   (autoload 'html2text "html2text" nil t))
  41
  42 (defvar gnus-article-mime-handles)
  43 (defvar gnus-newsgroup-charset)
  44 (defvar smime-keys)
  45 (defvar w3m-cid-retrieve-function-alist)
  46 (defvar w3m-current-buffer)
  47 (defvar w3m-display-inline-images)
  48 (defvar w3m-minor-mode-map)
  49
  50 (defvar mm-text-html-renderer-alist
  51   '((w3  . mm-inline-text-html-render-with-w3)
  52     (w3m . mm-inline-text-html-render-with-w3m)
  53     (w3m-standalone . mm-inline-text-html-render-with-w3m-standalone)
  54     (links mm-inline-render-with-file
  55            mm-links-remove-leading-blank
  56            "links" "-dump" file)
  57     (lynx  mm-inline-render-with-stdin nil
  58            "lynx" "-dump" "-force_html" "-stdin" "-nolist")
  59     (html2text  mm-inline-render-with-function html2text))
  60   "The attributes of renderer types for text/html.")
  61
  62 (defvar mm-text-html-washer-alist
  63   '((w3  . gnus-article-wash-html-with-w3)
  64     (w3m . gnus-article-wash-html-with-w3m)
  65     (w3m-standalone . gnus-article-wash-html-with-w3m-standalone)
  66     (links mm-inline-wash-with-file
  67            mm-links-remove-leading-blank
  68            "links" "-dump" file)
  69     (lynx  mm-inline-wash-with-stdin nil
  70            "lynx" "-dump" "-force_html" "-stdin" "-nolist")
  71     (html2text  html2text))
  72   "The attributes of washer types for text/html.")
  73
  74 (defcustom mm-fill-flowed t
  75   "If non-nil a format=flowed article will be displayed flowed."
  76   :type 'boolean
  77   :version "22.1"
  78   :group 'mime-display)
  79
  80 ;;; Internal variables.
  81
  82 ;;;
  83 ;;; Functions for displaying various formats inline
  84 ;;;
  85
  86 (defun mm-inline-image-emacs (handle)
  87   (let ((b (point-marker))
  88         buffer-read-only)
  89     (put-image (mm-get-image handle) b)
  90     (insert "\n\n")
  91     (mm-handle-set-undisplayer
  92      handle
  93      `(lambda ()
  94         (let ((b ,b)
  95               buffer-read-only)
  96           (remove-images b b)
  97           (delete-region b (+ b 2)))))))
  98
  99 (defun mm-inline-image-xemacs (handle)
 100   (when (featurep 'xemacs)
 101     (insert "\n\n")
 102     (forward-char -2)
 103     (let ((annot (make-annotation (mm-get-image handle) nil 'text))
 104           buffer-read-only)
 105       (mm-handle-set-undisplayer
 106        handle
 107        `(lambda ()
 108           (let ((b ,(point-marker))
 109                 buffer-read-only)
 110             (delete-annotation ,annot)
 111             (delete-region (- b 2) b))))
 112       (set-extent-property annot 'mm t)
 113       (set-extent-property annot 'duplicable t))))
 114
 115 (eval-and-compile
 116   (if (featurep 'xemacs)
 117       (defalias 'mm-inline-image 'mm-inline-image-xemacs)
 118     (defalias 'mm-inline-image 'mm-inline-image-emacs)))
 119
 120 (defvar mm-w3-setup nil)
 121 (defun mm-setup-w3 ()
 122   (unless mm-w3-setup
 123     (require 'w3)
 124     (w3-do-setup)
 125     (require 'url)
 126     (require 'w3-vars)
 127     (require 'url-vars)
 128     (setq mm-w3-setup t)))
 129
 130 (defun mm-inline-text-html-render-with-w3 (handle)
 131   (mm-setup-w3)
 132   (let ((text (mm-get-part handle))
 133         (b (point))
 134         (url-standalone-mode t)
 135         (url-gateway-unplugged t)
 136         (w3-honor-stylesheets nil)
 137         (url-current-object
 138          (url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
 139         (width (window-width))
 140         (charset (mail-content-type-get
 141                   (mm-handle-type handle) 'charset)))
 142     (save-excursion
 143       (insert (if charset (mm-decode-string text charset) text))
 144       (save-restriction
 145         (narrow-to-region b (point))
 146         (unless charset
 147           (goto-char (point-min))
 148           (when (or (and (boundp 'w3-meta-content-type-charset-regexp)
 149                          (re-search-forward
 150                           w3-meta-content-type-charset-regexp nil t))
 151                     (and (boundp 'w3-meta-charset-content-type-regexp)
 152                          (re-search-forward
 153                           w3-meta-charset-content-type-regexp nil t)))
 154             (setq charset
 155                   (let ((bsubstr (buffer-substring-no-properties
 156                                   (match-beginning 2)
 157                                   (match-end 2))))
 158                     (if (fboundp 'w3-coding-system-for-mime-charset)
 159                         (w3-coding-system-for-mime-charset bsubstr)
 160                       (mm-charset-to-coding-system bsubstr))))
 161             (delete-region (point-min) (point-max))
 162             (insert (mm-decode-string text charset))))
 163         (save-window-excursion
 164           (save-restriction
 165             (let ((w3-strict-width width)
 166                   ;; Don't let w3 set the global version of
 167                   ;; this variable.
 168                   (fill-column fill-column))
 169               (if (or debug-on-error debug-on-quit)
 170                   (w3-region (point-min) (point-max))
 171                 (condition-case ()
 172                     (w3-region (point-min) (point-max))
 173                   (error
 174                    (delete-region (point-min) (point-max))
 175                    (let ((b (point))
 176                          (charset (mail-content-type-get
 177                                    (mm-handle-type handle) 'charset)))
 178                      (if (or (eq charset 'gnus-decoded)
 179                              (eq mail-parse-charset 'gnus-decoded))
 180                        (save-restriction
 181                          (narrow-to-region (point) (point))
 182                          (mm-insert-part handle)
 183                          (goto-char (point-max)))
 184                        (insert (mm-decode-string (mm-get-part handle)
 185                                                  charset))))
 186                    (message
 187                     "Error while rendering html; showing as text/plain")))))))
 188         (mm-handle-set-undisplayer
 189          handle
 190          `(lambda ()
 191             (let (buffer-read-only)
 192               ,@(if (functionp 'remove-specifier)
 193                     '((mapcar (lambda (prop)
 194                                 (remove-specifier
 195                                  (face-property 'default prop)
 196                                  (current-buffer)))
 197                               '(background background-pixmap foreground))))
 198               (delete-region ,(point-min-marker)
 199                              ,(point-max-marker)))))))))
 200
 201 (defvar mm-w3m-setup nil
 202   "Whether gnus-article-mode has been setup to use emacs-w3m.")
 203
 204 (defun mm-setup-w3m ()
 205   "Setup gnus-article-mode to use emacs-w3m."
 206   (unless mm-w3m-setup
 207     (require 'w3m)
 208     (unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
 209       (push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
 210             w3m-cid-retrieve-function-alist))
 211     (setq mm-w3m-setup t))
 212   (setq w3m-display-inline-images mm-inline-text-html-with-images))
 213
 214 (defun mm-w3m-cid-retrieve-1 (url handle)
 215   (dolist (elem handle)
 216     (when (consp elem)
 217       (when (equal url (mm-handle-id elem))
 218         (mm-insert-part elem)
 219         (throw 'found-handle (mm-handle-media-type elem)))
 220       (when (and (stringp (car elem))
 221                  (equal "multipart" (mm-handle-media-supertype elem)))
 222         (mm-w3m-cid-retrieve-1 url elem)))))
 223
 224 (defun mm-w3m-cid-retrieve (url &rest args)
 225   "Insert a content pointed by URL if it has the cid: scheme."
 226   (when (string-match "\\`cid:" url)
 227     (or (catch 'found-handle
 228           (mm-w3m-cid-retrieve-1
 229            (setq url (concat "<" (substring url (match-end 0)) ">"))
 230            (with-current-buffer w3m-current-buffer
 231              gnus-article-mime-handles)))
 232         (prog1
 233             nil
 234           (message "Failed to find \"Content-ID: %s\"" url)))))
 235
 236 (defun mm-inline-text-html-render-with-w3m (handle)
 237   "Render a text/html part using emacs-w3m."
 238   (mm-setup-w3m)
 239   (let ((text (mm-get-part handle))
 240         (b (point))
 241         (charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
 242                      mail-parse-charset)))
 243     (save-excursion
 244       (insert (if charset (mm-decode-string text charset) text))
 245       (save-restriction
 246         (narrow-to-region b (point))
 247         (unless charset
 248           (goto-char (point-min))
 249           (when (setq charset (w3m-detect-meta-charset))
 250             (delete-region (point-min) (point-max))
 251             (insert (mm-decode-string text charset))))
 252         (let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
 253               w3m-force-redisplay)
 254           (w3m-region (point-min) (point-max) nil charset))
 255         (when (and mm-inline-text-html-with-w3m-keymap
 256                    (boundp 'w3m-minor-mode-map)
 257                    w3m-minor-mode-map)
 258           (add-text-properties
 259            (point-min) (point-max)
 260            (list 'keymap w3m-minor-mode-map
 261                  ;; Put the mark meaning this part was rendered by emacs-w3m.
 262                  'mm-inline-text-html-with-w3m t)))
 263         (mm-handle-set-undisplayer
 264          handle
 265          `(lambda ()
 266             (let ((inhibit-read-only t))
 267               (delete-region ,(point-min-marker)
 268                              ,(point-max-marker)))))))))
 269
 270 (defvar mm-w3m-standalone-supports-m17n-p (if (featurep 'mule) 'undecided)
 271   "*T means the w3m command supports the m17n feature.")
 272
 273 (defun mm-w3m-standalone-supports-m17n-p ()
 274   "Say whether the w3m command supports the m17n feature."
 275   (cond ((eq mm-w3m-standalone-supports-m17n-p t) t)
 276         ((eq mm-w3m-standalone-supports-m17n-p nil) nil)
 277         ((not (featurep 'mule)) (setq mm-w3m-standalone-supports-m17n-p nil))
 278         ((condition-case nil
 279              (let ((coding-system-for-write 'iso-2022-jp)
 280                    (coding-system-for-read 'iso-2022-jp)
 281                    (str (mm-decode-coding-string "\
 282 \e$B#D#o#e#s!!#w#3#m!!#s#u#p#p#o#r#t#s!!#m#1#7#n!)\e(B" 'iso-2022-jp)))
 283                (mm-with-multibyte-buffer
 284                  (insert str)
 285                  (call-process-region
 286                   (point-min) (point-max) "w3m" t t nil "-dump"
 287                   "-T" "text/html" "-I" "iso-2022-jp" "-O" "iso-2022-jp")
 288                  (goto-char (point-min))
 289                  (search-forward str nil t)))
 290            (error nil))
 291          (setq mm-w3m-standalone-supports-m17n-p t))
 292         (t
 293          ;;(message "You had better upgrade your w3m command")
 294          (setq mm-w3m-standalone-supports-m17n-p nil))))
 295
 296 (defun mm-inline-text-html-render-with-w3m-standalone (handle)
 297   "Render a text/html part using w3m."
 298   (if (mm-w3m-standalone-supports-m17n-p)
 299       (let ((source (mm-get-part handle))
 300             (charset (or (mail-content-type-get (mm-handle-type handle)
 301                                                 'charset)
 302                          (symbol-name mail-parse-charset)))
 303             cs)
 304         (unless (and charset
 305                      (setq cs (mm-charset-to-coding-system charset))
 306                      (not (eq cs 'ascii)))
 307           ;; The default.
 308           (setq charset "iso-8859-1"
 309                 cs 'iso-8859-1))
 310         (mm-insert-inline
 311          handle
 312          (mm-with-unibyte-buffer
 313            (insert source)
 314            (mm-enable-multibyte)
 315            (let ((coding-system-for-write 'binary)
 316                  (coding-system-for-read cs))
 317              (call-process-region
 318               (point-min) (point-max)
 319               "w3m" t t nil "-dump" "-T" "text/html"
 320               "-I" charset "-O" charset))
 321            (buffer-string))))
 322     (mm-inline-render-with-stdin handle nil "w3m" "-dump" "-T" "text/html")))
 323
 324 (defun mm-links-remove-leading-blank ()
 325   ;; Delete the annoying three spaces preceding each line of links
 326   ;; output.
 327   (goto-char (point-min))
 328   (while (re-search-forward "^   " nil t)
 329     (delete-region (match-beginning 0) (match-end 0))))
 330
 331 (defun mm-inline-wash-with-file (post-func cmd &rest args)
 332   (let ((file (mm-make-temp-file
 333                (expand-file-name "mm" mm-tmp-directory))))
 334     (let ((coding-system-for-write 'binary))
 335       (write-region (point-min) (point-max) file nil 'silent))
 336     (delete-region (point-min) (point-max))
 337     (unwind-protect
 338         (apply 'call-process cmd nil t nil (mapcar 'eval args))
 339       (delete-file file))
 340     (and post-func (funcall post-func))))
 341
 342 (defun mm-inline-wash-with-stdin (post-func cmd &rest args)
 343   (let ((coding-system-for-write 'binary))
 344     (apply 'call-process-region (point-min) (point-max)
 345            cmd t t nil args))
 346   (and post-func (funcall post-func)))
 347
 348 (defun mm-inline-render-with-file (handle post-func cmd &rest args)
 349   (let ((source (mm-get-part handle)))
 350     (mm-insert-inline
 351      handle
 352      (mm-with-unibyte-buffer
 353        (insert source)
 354        (apply 'mm-inline-wash-with-file post-func cmd args)
 355        (buffer-string)))))
 356
 357 (defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
 358   (let ((source (mm-get-part handle)))
 359     (mm-insert-inline
 360      handle
 361      (mm-with-unibyte-buffer
 362        (insert source)
 363        (apply 'mm-inline-wash-with-stdin post-func cmd args)
 364        (buffer-string)))))
 365
 366 (defun mm-inline-render-with-function (handle func &rest args)
 367   (let ((source (mm-get-part handle))
 368         (charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
 369                      mail-parse-charset)))
 370     (mm-insert-inline
 371      handle
 372      (mm-with-multibyte-buffer
 373        (insert (if charset
 374                    (mm-decode-string source charset)
 375                  source))
 376        (apply func args)
 377        (buffer-string)))))
 378
 379 (defun mm-inline-text-html (handle)
 380   (let* ((func (or mm-inline-text-html-renderer mm-text-html-renderer))
 381          (entry (assq func mm-text-html-renderer-alist))
 382          buffer-read-only)
 383     (if entry
 384         (setq func (cdr entry)))
 385     (cond
 386      ((functionp func)
 387       (funcall func handle))
 388      (t
 389       (apply (car func) handle (cdr func))))))
 390
 391 (defun mm-inline-text-vcard (handle)
 392   (let (buffer-read-only)
 393     (mm-insert-inline
 394      handle
 395      (concat "\n-- \n"
 396              (ignore-errors
 397                (if (fboundp 'vcard-pretty-print)
 398                    (vcard-pretty-print (mm-get-part handle))
 399                  (vcard-format-string
 400                   (vcard-parse-string (mm-get-part handle)
 401                                       'vcard-standard-filter))))))))
 402
 403 (defun mm-inline-text (handle)
 404   (let ((b (point))
 405         (type (mm-handle-media-subtype handle))
 406         (charset (mail-content-type-get
 407                   (mm-handle-type handle) 'charset))
 408         buffer-read-only)
 409     (if (or (eq charset 'gnus-decoded)
 410             ;; This is probably not entirely correct, but
 411             ;; makes rfc822 parts with embedded multiparts work.
 412             (eq mail-parse-charset 'gnus-decoded))
 413         (save-restriction
 414           (narrow-to-region (point) (point))
 415           (mm-insert-part handle)
 416           (goto-char (point-max)))
 417       (insert (mm-decode-string (mm-get-part handle) charset)))
 418     (when (and mm-fill-flowed
 419                (equal type "plain")
 420                (equal (cdr (assoc 'format (mm-handle-type handle)))
 421                       "flowed"))
 422       (save-restriction
 423         (narrow-to-region b (point))
 424         (goto-char b)
 425         (fill-flowed nil (equal (cdr (assoc 'delsp (mm-handle-type handle)))
 426                                 "yes"))
 427         (goto-char (point-max))))
 428     (save-restriction
 429       (narrow-to-region b (point))
 430       (when (or (equal type "enriched")
 431                 (equal type "richtext"))
 432         (set-text-properties (point-min) (point-max) nil)
 433         (ignore-errors
 434           (enriched-decode (point-min) (point-max))))
 435       (mm-handle-set-undisplayer
 436        handle
 437        `(lambda ()
 438           (let (buffer-read-only)
 439             (delete-region ,(point-min-marker)
 440                            ,(point-max-marker))))))))
 441
 442 (defun mm-insert-inline (handle text)
 443   "Insert TEXT inline from HANDLE."
 444   (let ((b (point)))
 445     (insert text)
 446     (unless (bolp)
 447       (insert "\n"))
 448     (mm-handle-set-undisplayer
 449      handle
 450      `(lambda ()
 451         (let (buffer-read-only)
 452           (delete-region ,(set-marker (make-marker) b)
 453                          ,(set-marker (make-marker) (point))))))))
 454
 455 (defun mm-inline-audio (handle)
 456   (message "Not implemented"))
 457
 458 (defun mm-view-sound-file ()
 459   (message "Not implemented"))
 460
 461 (defun mm-w3-prepare-buffer ()
 462   (require 'w3)
 463   (let ((url-standalone-mode t)
 464         (url-gateway-unplugged t)
 465         (w3-honor-stylesheets nil))
 466     (w3-prepare-buffer)))
 467
 468 (defun mm-view-message ()
 469   (mm-enable-multibyte)
 470   (let (handles)
 471     (let (gnus-article-mime-handles)
 472       ;; Double decode problem may happen.  See mm-inline-message.
 473       (run-hooks 'gnus-article-decode-hook)
 474       (gnus-article-prepare-display)
 475       (setq handles gnus-article-mime-handles))
 476     (when handles
 477       (setq gnus-article-mime-handles
 478             (mm-merge-handles gnus-article-mime-handles handles))))
 479   (fundamental-mode)
 480   (goto-char (point-min)))
 481
 482 (defun mm-inline-message (handle)
 483   (let ((b (point))
 484         (bolp (bolp))
 485         (charset (mail-content-type-get
 486                   (mm-handle-type handle) 'charset))
 487         gnus-displaying-mime handles)
 488     (when (and charset
 489                (stringp charset))
 490       (setq charset (intern (downcase charset)))
 491       (when (eq charset 'us-ascii)
 492         (setq charset nil)))
 493     (save-excursion
 494       (save-restriction
 495         (narrow-to-region b b)
 496         (mm-insert-part handle)
 497         (let (gnus-article-mime-handles
 498               ;; disable prepare hook
 499               gnus-article-prepare-hook
 500               (gnus-newsgroup-charset
 501                (unless (eq charset 'gnus-decoded) ;; mm-uu might set it.
 502                  (or charset gnus-newsgroup-charset))))
 503           (let ((gnus-original-article-buffer (mm-handle-buffer handle)))
 504             (run-hooks 'gnus-article-decode-hook))
 505           (gnus-article-prepare-display)
 506           (setq handles gnus-article-mime-handles))
 507         (goto-char (point-min))
 508         (unless bolp
 509           (insert "\n"))
 510         (goto-char (point-max))
 511         (unless (bolp)
 512           (insert "\n"))
 513         (insert "----------\n\n")
 514         (when handles
 515           (setq gnus-article-mime-handles
 516                 (mm-merge-handles gnus-article-mime-handles handles)))
 517         (mm-handle-set-undisplayer
 518          handle
 519          `(lambda ()
 520             (let (buffer-read-only)
 521               (if (fboundp 'remove-specifier)
 522                   ;; This is only valid on XEmacs.
 523                   (mapcar (lambda (prop)
 524                             (remove-specifier
 525                              (face-property 'default prop) (current-buffer)))
 526                           '(background background-pixmap foreground)))
 527               (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
 528
 529 (defun mm-display-inline-fontify (handle mode)
 530   (let ((charset (mail-content-type-get (mm-handle-type handle) 'charset))
 531         text coding-system)
 532     (unless (eq charset 'gnus-decoded)
 533       (mm-with-unibyte-buffer
 534         (mm-insert-part handle)
 535         (mm-decompress-buffer
 536          (or (mail-content-type-get (mm-handle-disposition handle) 'name)
 537              (mail-content-type-get (mm-handle-disposition handle) 'filename))
 538          t t)
 539         (unless charset
 540           (setq coding-system (mm-find-buffer-file-coding-system)))
 541         (setq text (buffer-string))))
 542     ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
 543     ;; on for buffers whose name begins with " ".  That's why we use
 544     ;; `with-current-buffer'/`generate-new-buffer' rather than
 545     ;; `with-temp-buffer'.
 546     (with-current-buffer (generate-new-buffer "*fontification*")
 547       (buffer-disable-undo)
 548       (mm-enable-multibyte)
 549       (insert (cond ((eq charset 'gnus-decoded)
 550                      (with-current-buffer (mm-handle-buffer handle)
 551                        (buffer-string)))
 552                     (coding-system
 553                      (mm-decode-coding-string text coding-system))
 554                     (charset
 555                      (mm-decode-string text charset))
 556                     (t
 557                      text)))
 558       (require 'font-lock)
 559       (let ((font-lock-maximum-size nil)
 560             ;; Disable support modes, e.g., jit-lock, lazy-lock, etc.
 561             (font-lock-mode-hook nil)
 562             (font-lock-support-mode nil)
 563             ;; I find font-lock a bit too verbose.
 564             (font-lock-verbose nil))
 565         (funcall mode)
 566         ;; The mode function might have already turned on font-lock.
 567         (unless (symbol-value 'font-lock-mode)
 568           (font-lock-fontify-buffer)))
 569       ;; By default, XEmacs font-lock uses non-duplicable text
 570       ;; properties.  This code forces all the text properties
 571       ;; to be copied along with the text.
 572       (when (featurep 'xemacs)
 573         (map-extents (lambda (ext ignored)
 574                        (set-extent-property ext 'duplicable t)
 575                        nil)
 576                      nil nil nil nil nil 'text-prop))
 577       (setq text (buffer-string))
 578       (kill-buffer (current-buffer)))
 579     (mm-insert-inline handle text)))
 580
 581 ;; Shouldn't these functions check whether the user even wants to use
 582 ;; font-lock?  At least under XEmacs, this fontification is pretty
 583 ;; much unconditional.  Also, it would be nice to change for the size
 584 ;; of the fontified region.
 585
 586 (defun mm-display-patch-inline (handle)
 587   (mm-display-inline-fontify handle 'diff-mode))
 588
 589 (defun mm-display-elisp-inline (handle)
 590   (mm-display-inline-fontify handle 'emacs-lisp-mode))
 591
 592 (defun mm-display-dns-inline (handle)
 593   (mm-display-inline-fontify handle 'dns-mode))
 594
 595 ;;      id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 596 ;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
 597 (defvar mm-pkcs7-signed-magic
 598   (mm-string-as-unibyte
 599    (mapconcat 'char-to-string
 600               (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
 601                     ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
 602                     ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
 603                     ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02) "")))
 604
 605 ;;      id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 606 ;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
 607 (defvar mm-pkcs7-enveloped-magic
 608   (mm-string-as-unibyte
 609    (mapconcat 'char-to-string
 610               (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
 611                     ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
 612                     ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
 613                     ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03) "")))
 614
 615 (defun mm-view-pkcs7-get-type (handle)
 616   (mm-with-unibyte-buffer
 617     (mm-insert-part handle)
 618     (cond ((looking-at mm-pkcs7-enveloped-magic)
 619            'enveloped)
 620           ((looking-at mm-pkcs7-signed-magic)
 621            'signed)
 622           (t
 623            (error "Could not identify PKCS#7 type")))))
 624
 625 (defun mm-view-pkcs7 (handle)
 626   (case (mm-view-pkcs7-get-type handle)
 627     (enveloped (mm-view-pkcs7-decrypt handle))
 628     (signed (mm-view-pkcs7-verify handle))
 629     (otherwise (error "Unknown or unimplemented PKCS#7 type"))))
 630
 631 (defun mm-view-pkcs7-verify (handle)
 632   (let ((verified nil))
 633     (with-temp-buffer
 634       (insert "MIME-Version: 1.0\n")
 635       (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
 636       (insert-buffer-substring (mm-handle-buffer handle))
 637       (setq verified (smime-verify-region (point-min) (point-max))))
 638     (goto-char (point-min))
 639     (mm-insert-part handle)
 640     (if (search-forward "Content-Type: " nil t)
 641         (delete-region (point-min) (match-beginning 0)))
 642     (goto-char (point-max))
 643     (if (re-search-backward "--\r?\n?" nil t)
 644         (delete-region (match-end 0) (point-max)))
 645     (unless verified
 646       (insert-buffer-substring smime-details-buffer)))
 647   (goto-char (point-min))
 648   (while (search-forward "\r\n" nil t)
 649     (replace-match "\n"))
 650   t)
 651
 652 (defun mm-view-pkcs7-decrypt (handle)
 653   (insert-buffer-substring (mm-handle-buffer handle))
 654   (goto-char (point-min))
 655   (insert "MIME-Version: 1.0\n")
 656   (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
 657   (smime-decrypt-region
 658    (point-min) (point-max)
 659    (if (= (length smime-keys) 1)
 660        (cadar smime-keys)
 661      (smime-get-key-by-email
 662       (completing-read
 663        (concat "Decipher using key"
 664                (if smime-keys (concat "(default " (caar smime-keys) "): ")
 665                  ": "))
 666        smime-keys nil nil nil nil (car-safe (car-safe smime-keys))))))
 667   (goto-char (point-min))
 668   (while (search-forward "\r\n" nil t)
 669     (replace-match "\n"))
 670   (goto-char (point-min)))
 671
 672 (provide 'mm-view)
 673
 674 ;;; arch-tag: b60e749a-d05c-47f2-bccd-bdaa59327cb2
 675 ;;; mm-view.el ends here