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, 2005, 2006,
   4 ;;   2007, 2008  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 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 (eval-and-compile
  26   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  27 (eval-when-compile (require 'cl))
  28 (require 'mail-parse)
  29 (require 'mailcap)
  30 (require 'mm-bodies)
  31 (require 'mm-decode)
  32 (require 'smime)
  33
  34 (autoload 'gnus-article-prepare-display "gnus-art")
  35 (autoload 'vcard-parse-string "vcard")
  36 (autoload 'vcard-format-string "vcard")
  37 (autoload 'fill-flowed "flow-fill")
  38 (autoload 'html2text "html2text" nil t)
  39
  40 (defvar gnus-article-mime-handles)
  41 (defvar gnus-newsgroup-charset)
  42 (defvar smime-keys)
  43 (defvar w3m-cid-retrieve-function-alist)
  44 (defvar w3m-current-buffer)
  45 (defvar w3m-display-inline-images)
  46 (defvar w3m-minor-mode-map)
  47
  48 (defvar mm-text-html-renderer-alist
  49   '((w3  . mm-inline-text-html-render-with-w3)
  50     (w3m . mm-inline-text-html-render-with-w3m)
  51     (w3m-standalone . mm-inline-text-html-render-with-w3m-standalone)
  52     (links mm-inline-render-with-file
  53            mm-links-remove-leading-blank
  54            "links" "-dump" file)
  55     (lynx  mm-inline-render-with-stdin nil
  56            "lynx" "-dump" "-force_html" "-stdin" "-nolist")
  57     (html2text  mm-inline-render-with-function html2text))
  58   "The attributes of renderer types for text/html.")
  59
  60 (defvar mm-text-html-washer-alist
  61   '((w3  . gnus-article-wash-html-with-w3)
  62     (w3m . gnus-article-wash-html-with-w3m)
  63     (w3m-standalone . gnus-article-wash-html-with-w3m-standalone)
  64     (links mm-inline-wash-with-file
  65            mm-links-remove-leading-blank
  66            "links" "-dump" file)
  67     (lynx  mm-inline-wash-with-stdin nil
  68            "lynx" "-dump" "-force_html" "-stdin" "-nolist")
  69     (html2text  html2text))
  70   "The attributes of washer types for text/html.")
  71
  72 (defcustom mm-fill-flowed t
  73   "If non-nil a format=flowed article will be displayed flowed."
  74   :type 'boolean
  75   :version "22.1"
  76   :group 'mime-display)
  77
  78 ;;; Internal variables.
  79
  80 ;;;
  81 ;;; Functions for displaying various formats inline
  82 ;;;
  83
  84 (defun mm-inline-image-emacs (handle)
  85   (let ((b (point-marker))
  86         (inhibit-read-only t))
  87     (put-image (mm-get-image handle) b)
  88     (insert "\n\n")
  89     (mm-handle-set-undisplayer
  90      handle
  91      `(lambda ()
  92         (let ((b ,b)
  93               (inhibit-read-only t))
  94           (remove-images b b)
  95           (delete-region b (+ b 2)))))))
  96
  97 (defun mm-inline-image-xemacs (handle)
  98   (when (featurep 'xemacs)
  99     (insert "\n\n")
 100     (forward-char -2)
 101     (let ((annot (make-annotation (mm-get-image handle) nil 'text))
 102         (inhibit-read-only t))
 103       (mm-handle-set-undisplayer
 104        handle
 105        `(lambda ()
 106           (let ((b ,(point-marker))
 107               (inhibit-read-only t))
 108             (delete-annotation ,annot)
 109             (delete-region (- b 2) b))))
 110       (set-extent-property annot 'mm t)
 111       (set-extent-property annot 'duplicable t))))
 112
 113 (eval-and-compile
 114   (if (featurep 'xemacs)
 115       (defalias 'mm-inline-image 'mm-inline-image-xemacs)
 116     (defalias 'mm-inline-image 'mm-inline-image-emacs)))
 117
 118 ;; External.
 119 (declare-function w3-do-setup       "ext:w3"         ())
 120 (declare-function w3-region         "ext:w3-display" (st nd))
 121 (declare-function w3-prepare-buffer "ext:w3-display" (&rest args))
 122
 123 (defvar mm-w3-setup nil)
 124 (defun mm-setup-w3 ()
 125   (unless mm-w3-setup
 126     (require 'w3)
 127     (w3-do-setup)
 128     (require 'url)
 129     (require 'w3-vars)
 130     (require 'url-vars)
 131     (setq mm-w3-setup t)))
 132
 133 (defun mm-inline-text-html-render-with-w3 (handle)
 134   (mm-setup-w3)
 135   (let ((text (mm-get-part handle))
 136         (b (point))
 137         (url-standalone-mode t)
 138         (url-gateway-unplugged t)
 139         (w3-honor-stylesheets nil)
 140         (url-current-object
 141          (url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
 142         (width (window-width))
 143         (charset (mail-content-type-get
 144                   (mm-handle-type handle) 'charset)))
 145     (save-excursion
 146       (insert (if charset (mm-decode-string text charset) text))
 147       (save-restriction
 148         (narrow-to-region b (point))
 149         (unless charset
 150           (goto-char (point-min))
 151           (when (or (and (boundp 'w3-meta-content-type-charset-regexp)
 152                          (re-search-forward
 153                           w3-meta-content-type-charset-regexp nil t))
 154                     (and (boundp 'w3-meta-charset-content-type-regexp)
 155                          (re-search-forward
 156                           w3-meta-charset-content-type-regexp nil t)))
 157             (setq charset
 158                   (let ((bsubstr (buffer-substring-no-properties
 159                                   (match-beginning 2)
 160                                   (match-end 2))))
 161                     (if (fboundp 'w3-coding-system-for-mime-charset)
 162                         (w3-coding-system-for-mime-charset bsubstr)
 163                       (mm-charset-to-coding-system bsubstr))))
 164             (delete-region (point-min) (point-max))
 165             (insert (mm-decode-string text charset))))
 166         (save-window-excursion
 167           (save-restriction
 168             (let ((w3-strict-width width)
 169                   ;; Don't let w3 set the global version of
 170                   ;; this variable.
 171                   (fill-column fill-column))
 172               (if (or debug-on-error debug-on-quit)
 173                   (w3-region (point-min) (point-max))
 174                 (condition-case ()
 175                     (w3-region (point-min) (point-max))
 176                   (error
 177                    (delete-region (point-min) (point-max))
 178                    (let ((b (point))
 179                          (charset (mail-content-type-get
 180                                    (mm-handle-type handle) 'charset)))
 181                      (if (or (eq charset 'gnus-decoded)
 182                              (eq mail-parse-charset 'gnus-decoded))
 183                        (save-restriction
 184                          (narrow-to-region (point) (point))
 185                          (mm-insert-part handle)
 186                          (goto-char (point-max)))
 187                        (insert (mm-decode-string (mm-get-part handle)
 188                                                  charset))))
 189                    (message
 190                     "Error while rendering html; showing as text/plain")))))))
 191         (mm-handle-set-undisplayer
 192          handle
 193          `(lambda ()
 194             (let ((inhibit-read-only t))
 195               ,@(if (functionp 'remove-specifier)
 196                     '((dolist (prop '(background background-pixmap foreground))
 197                         (remove-specifier
 198                          (face-property 'default prop)
 199                          (current-buffer)))))
 200               (delete-region ,(point-min-marker)
 201                              ,(point-max-marker)))))))))
 202
 203 (defvar mm-w3m-setup nil
 204   "Whether gnus-article-mode has been setup to use emacs-w3m.")
 205
 206 ;; External.
 207 (declare-function w3m-detect-meta-charset "ext:w3m" ())
 208 (declare-function w3m-region "ext:w3m" (start end &optional url charset))
 209
 210 (defun mm-setup-w3m ()
 211   "Setup gnus-article-mode to use emacs-w3m."
 212   (unless mm-w3m-setup
 213     (require 'w3m)
 214     (unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
 215       (push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
 216             w3m-cid-retrieve-function-alist))
 217     (setq mm-w3m-setup t))
 218   (setq w3m-display-inline-images mm-inline-text-html-with-images))
 219
 220 (defun mm-w3m-cid-retrieve-1 (url handle)
 221   (dolist (elem handle)
 222     (when (consp elem)
 223       (when (equal url (mm-handle-id elem))
 224         (mm-insert-part elem)
 225         (throw 'found-handle (mm-handle-media-type elem)))
 226       (when (and (stringp (car elem))
 227                  (equal "multipart" (mm-handle-media-supertype elem)))
 228         (mm-w3m-cid-retrieve-1 url elem)))))
 229
 230 (defun mm-w3m-cid-retrieve (url &rest args)
 231   "Insert a content pointed by URL if it has the cid: scheme."
 232   (when (string-match "\\`cid:" url)
 233     (or (catch 'found-handle
 234           (mm-w3m-cid-retrieve-1
 235            (setq url (concat "<" (substring url (match-end 0)) ">"))
 236            (with-current-buffer w3m-current-buffer
 237              gnus-article-mime-handles)))
 238         (prog1
 239             nil
 240           (message "Failed to find \"Content-ID: %s\"" url)))))
 241
 242 (defun mm-inline-text-html-render-with-w3m (handle)
 243   "Render a text/html part using emacs-w3m."
 244   (mm-setup-w3m)
 245   (let ((text (mm-get-part handle))
 246         (b (point))
 247         (charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
 248                      mail-parse-charset)))
 249     (save-excursion
 250       (insert (if charset (mm-decode-string text charset) text))
 251       (save-restriction
 252         (narrow-to-region b (point))
 253         (unless charset
 254           (goto-char (point-min))
 255           (when (setq charset (w3m-detect-meta-charset))
 256             (delete-region (point-min) (point-max))
 257             (insert (mm-decode-string text charset))))
 258         (let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
 259               w3m-force-redisplay)
 260           (w3m-region (point-min) (point-max) nil charset))
 261         (when (and mm-inline-text-html-with-w3m-keymap
 262                    (boundp 'w3m-minor-mode-map)
 263                    w3m-minor-mode-map)
 264           (add-text-properties
 265            (point-min) (point-max)
 266            (list 'keymap w3m-minor-mode-map
 267                  ;; Put the mark meaning this part was rendered by emacs-w3m.
 268                  'mm-inline-text-html-with-w3m t)))
 269         (mm-handle-set-undisplayer
 270          handle
 271          `(lambda ()
 272             (let ((inhibit-read-only t))
 273               (delete-region ,(point-min-marker)
 274                              ,(point-max-marker)))))))))
 275
 276 (defvar mm-w3m-standalone-supports-m17n-p (if (featurep 'mule) 'undecided)
 277   "*T means the w3m command supports the m17n feature.")
 278
 279 (defun mm-w3m-standalone-supports-m17n-p ()
 280   "Say whether the w3m command supports the m17n feature."
 281   (cond ((eq mm-w3m-standalone-supports-m17n-p t) t)
 282         ((eq mm-w3m-standalone-supports-m17n-p nil) nil)
 283         ((not (featurep 'mule)) (setq mm-w3m-standalone-supports-m17n-p nil))
 284         ((condition-case nil
 285              (let ((coding-system-for-write 'iso-2022-jp)
 286                    (coding-system-for-read 'iso-2022-jp)
 287                    (str (mm-decode-coding-string "\
 288 \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)))
 289                (mm-with-multibyte-buffer
 290                  (insert str)
 291                  (call-process-region
 292                   (point-min) (point-max) "w3m" t t nil "-dump"
 293                   "-T" "text/html" "-I" "iso-2022-jp" "-O" "iso-2022-jp")
 294                  (goto-char (point-min))
 295                  (search-forward str nil t)))
 296            (error nil))
 297          (setq mm-w3m-standalone-supports-m17n-p t))
 298         (t
 299          ;;(message "You had better upgrade your w3m command")
 300          (setq mm-w3m-standalone-supports-m17n-p nil))))
 301
 302 (defun mm-inline-text-html-render-with-w3m-standalone (handle)
 303   "Render a text/html part using w3m."
 304   (if (mm-w3m-standalone-supports-m17n-p)
 305       (let ((source (mm-get-part handle))
 306             (charset (or (mail-content-type-get (mm-handle-type handle)
 307                                                 'charset)
 308                          (symbol-name mail-parse-charset)))
 309             cs)
 310         (unless (and charset
 311                      (setq cs (mm-charset-to-coding-system charset))
 312                      (not (eq cs 'ascii)))
 313           ;; The default.
 314           (setq charset "iso-8859-1"
 315                 cs 'iso-8859-1))
 316         (mm-insert-inline
 317          handle
 318          (mm-with-unibyte-buffer
 319            (insert source)
 320            (mm-enable-multibyte)
 321            (let ((coding-system-for-write 'binary)
 322                  (coding-system-for-read cs))
 323              (call-process-region
 324               (point-min) (point-max)
 325               "w3m" t t nil "-dump" "-T" "text/html"
 326               "-I" charset "-O" charset))
 327            (buffer-string))))
 328     (mm-inline-render-with-stdin handle nil "w3m" "-dump" "-T" "text/html")))
 329
 330 (defun mm-links-remove-leading-blank ()
 331   ;; Delete the annoying three spaces preceding each line of links
 332   ;; output.
 333   (goto-char (point-min))
 334   (while (re-search-forward "^   " nil t)
 335     (delete-region (match-beginning 0) (match-end 0))))
 336
 337 (defun mm-inline-wash-with-file (post-func cmd &rest args)
 338   (let ((file (mm-make-temp-file
 339                (expand-file-name "mm" mm-tmp-directory))))
 340     (let ((coding-system-for-write 'binary))
 341       (write-region (point-min) (point-max) file nil 'silent))
 342     (delete-region (point-min) (point-max))
 343     (unwind-protect
 344         (apply 'call-process cmd nil t nil (mapcar 'eval args))
 345       (delete-file file))
 346     (and post-func (funcall post-func))))
 347
 348 (defun mm-inline-wash-with-stdin (post-func cmd &rest args)
 349   (let ((coding-system-for-write 'binary))
 350     (apply 'call-process-region (point-min) (point-max)
 351            cmd t t nil args))
 352   (and post-func (funcall post-func)))
 353
 354 (defun mm-inline-render-with-file (handle post-func cmd &rest args)
 355   (let ((source (mm-get-part handle)))
 356     (mm-insert-inline
 357      handle
 358      (mm-with-unibyte-buffer
 359        (insert source)
 360        (apply 'mm-inline-wash-with-file post-func cmd args)
 361        (buffer-string)))))
 362
 363 (defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
 364   (let ((source (mm-get-part handle)))
 365     (mm-insert-inline
 366      handle
 367      (mm-with-unibyte-buffer
 368        (insert source)
 369        (apply 'mm-inline-wash-with-stdin post-func cmd args)
 370        (buffer-string)))))
 371
 372 (defun mm-inline-render-with-function (handle func &rest args)
 373   (let ((source (mm-get-part handle))
 374         (charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
 375                      mail-parse-charset)))
 376     (mm-insert-inline
 377      handle
 378      (mm-with-multibyte-buffer
 379        (insert (if charset
 380                    (mm-decode-string source charset)
 381                  source))
 382        (apply func args)
 383        (buffer-string)))))
 384
 385 (defun mm-inline-text-html (handle)
 386   (let* ((func (or mm-inline-text-html-renderer mm-text-html-renderer))
 387          (entry (assq func mm-text-html-renderer-alist))
 388          (inhibit-read-only t))
 389     (if entry
 390         (setq func (cdr entry)))
 391     (cond
 392      ((functionp func)
 393       (funcall func handle))
 394      (t
 395       (apply (car func) handle (cdr func))))))
 396
 397 (defun mm-inline-text-vcard (handle)
 398   (let ((inhibit-read-only t))
 399     (mm-insert-inline
 400      handle
 401      (concat "\n-- \n"
 402              (ignore-errors
 403                (if (fboundp 'vcard-pretty-print)
 404                    (vcard-pretty-print (mm-get-part handle))
 405                  (vcard-format-string
 406                   (vcard-parse-string (mm-get-part handle)
 407                                       'vcard-standard-filter))))))))
 408
 409 (defun mm-inline-text (handle)
 410   (let ((b (point))
 411         (type (mm-handle-media-subtype handle))
 412         (charset (mail-content-type-get
 413                   (mm-handle-type handle) 'charset))
 414         (inhibit-read-only t))
 415     (if (or (eq charset 'gnus-decoded)
 416             ;; This is probably not entirely correct, but
 417             ;; makes rfc822 parts with embedded multiparts work.
 418             (eq mail-parse-charset 'gnus-decoded))
 419         (save-restriction
 420           (narrow-to-region (point) (point))
 421           (mm-insert-part handle)
 422           (goto-char (point-max)))
 423       (insert (mm-decode-string (mm-get-part handle) charset)))
 424     (when (and mm-fill-flowed
 425                (equal type "plain")
 426                (equal (cdr (assoc 'format (mm-handle-type handle)))
 427                       "flowed"))
 428       (save-restriction
 429         (narrow-to-region b (point))
 430         (goto-char b)
 431         (fill-flowed nil (equal (cdr (assoc 'delsp (mm-handle-type handle)))
 432                                 "yes"))
 433         (goto-char (point-max))))
 434     (save-restriction
 435       (narrow-to-region b (point))
 436       (when (member type '("enriched" "richtext"))
 437         (set-text-properties (point-min) (point-max) nil)
 438         (ignore-errors
 439           (enriched-decode (point-min) (point-max))))
 440       (mm-handle-set-undisplayer
 441        handle
 442        `(lambda ()
 443           (let ((inhibit-read-only t))
 444             (delete-region ,(point-min-marker)
 445                            ,(point-max-marker))))))))
 446
 447 (defun mm-insert-inline (handle text)
 448   "Insert TEXT inline from HANDLE."
 449   (let ((b (point)))
 450     (insert text)
 451     (unless (bolp)
 452       (insert "\n"))
 453     (mm-handle-set-undisplayer
 454      handle
 455      `(lambda ()
 456         (let ((inhibit-read-only t))
 457           (delete-region ,(copy-marker b)
 458                          ,(copy-marker (point))))))))
 459
 460 (defun mm-inline-audio (handle)
 461   (message "Not implemented"))
 462
 463 (defun mm-view-sound-file ()
 464   (message "Not implemented"))
 465
 466 (defun mm-w3-prepare-buffer ()
 467   (require 'w3)
 468   (let ((url-standalone-mode t)
 469         (url-gateway-unplugged t)
 470         (w3-honor-stylesheets nil))
 471     (w3-prepare-buffer)))
 472
 473 (defun mm-view-message ()
 474   (mm-enable-multibyte)
 475   (let (handles)
 476     (let (gnus-article-mime-handles)
 477       ;; Double decode problem may happen.  See mm-inline-message.
 478       (run-hooks 'gnus-article-decode-hook)
 479       (gnus-article-prepare-display)
 480       (setq handles gnus-article-mime-handles))
 481     (when handles
 482       (setq gnus-article-mime-handles
 483             (mm-merge-handles gnus-article-mime-handles handles))))
 484   (fundamental-mode)
 485   (goto-char (point-min)))
 486
 487 (defun mm-inline-message (handle)
 488   (let ((b (point))
 489         (bolp (bolp))
 490         (charset (mail-content-type-get
 491                   (mm-handle-type handle) 'charset))
 492         gnus-displaying-mime handles)
 493     (when (and charset
 494                (stringp charset))
 495       (setq charset (intern (downcase charset)))
 496       (when (eq charset 'us-ascii)
 497         (setq charset nil)))
 498     (save-excursion
 499       (save-restriction
 500         (narrow-to-region b b)
 501         (mm-insert-part handle)
 502         (let (gnus-article-mime-handles
 503               ;; disable prepare hook
 504               gnus-article-prepare-hook
 505               (gnus-newsgroup-charset
 506                (unless (eq charset 'gnus-decoded) ;; mm-uu might set it.
 507                  (or charset gnus-newsgroup-charset))))
 508           (let ((gnus-original-article-buffer (mm-handle-buffer handle)))
 509             (run-hooks 'gnus-article-decode-hook))
 510           (gnus-article-prepare-display)
 511           (setq handles gnus-article-mime-handles))
 512         (goto-char (point-min))
 513         (unless bolp
 514           (insert "\n"))
 515         (goto-char (point-max))
 516         (unless (bolp)
 517           (insert "\n"))
 518         (insert "----------\n\n")
 519         (when handles
 520           (setq gnus-article-mime-handles
 521                 (mm-merge-handles gnus-article-mime-handles handles)))
 522         (mm-handle-set-undisplayer
 523          handle
 524          `(lambda ()
 525             (let ((inhibit-read-only t))
 526               (if (fboundp 'remove-specifier)
 527                   ;; This is only valid on XEmacs.
 528                   (dolist (prop '(background background-pixmap foreground))
 529                     (remove-specifier
 530                      (face-property 'default prop) (current-buffer))))
 531               (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
 532
 533 (defun mm-display-inline-fontify (handle mode)
 534   (let ((charset (mail-content-type-get (mm-handle-type handle) 'charset))
 535         text coding-system)
 536     (unless (eq charset 'gnus-decoded)
 537       (mm-with-unibyte-buffer
 538         (mm-insert-part handle)
 539         (mm-decompress-buffer
 540          (or (mail-content-type-get (mm-handle-disposition handle) 'name)
 541              (mail-content-type-get (mm-handle-disposition handle) 'filename))
 542          t t)
 543         (unless charset
 544           (setq coding-system (mm-find-buffer-file-coding-system)))
 545         (setq text (buffer-string))))
 546     ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
 547     ;; on for buffers whose name begins with " ".  That's why we use
 548     ;; `with-current-buffer'/`generate-new-buffer' rather than
 549     ;; `with-temp-buffer'.
 550     (with-current-buffer (generate-new-buffer "*fontification*")
 551       (buffer-disable-undo)
 552       (mm-enable-multibyte)
 553       (insert (cond ((eq charset 'gnus-decoded)
 554                      (with-current-buffer (mm-handle-buffer handle)
 555                        (buffer-string)))
 556                     (coding-system
 557                      (mm-decode-coding-string text coding-system))
 558                     (charset
 559                      (mm-decode-string text charset))
 560                     (t
 561                      text)))
 562       (require 'font-lock)
 563       (let ((font-lock-maximum-size nil)
 564             ;; Disable support modes, e.g., jit-lock, lazy-lock, etc.
 565             (font-lock-mode-hook nil)
 566             (font-lock-support-mode nil)
 567             ;; I find font-lock a bit too verbose.
 568             (font-lock-verbose nil))
 569         (funcall mode)
 570         ;; The mode function might have already turned on font-lock.
 571         (unless (symbol-value 'font-lock-mode)
 572           (font-lock-fontify-buffer)))
 573       ;; By default, XEmacs font-lock uses non-duplicable text
 574       ;; properties.  This code forces all the text properties
 575       ;; to be copied along with the text.
 576       (when (featurep 'xemacs)
 577         (map-extents (lambda (ext ignored)
 578                        (set-extent-property ext 'duplicable t)
 579                        nil)
 580                      nil nil nil nil nil 'text-prop))
 581       (setq text (buffer-string))
 582       (kill-buffer (current-buffer)))
 583     (mm-insert-inline handle text)))
 584
 585 ;; Shouldn't these functions check whether the user even wants to use
 586 ;; font-lock?  At least under XEmacs, this fontification is pretty
 587 ;; much unconditional.  Also, it would be nice to change for the size
 588 ;; of the fontified region.
 589
 590 (defun mm-display-patch-inline (handle)
 591   (mm-display-inline-fontify handle 'diff-mode))
 592
 593 (defun mm-display-elisp-inline (handle)
 594   (mm-display-inline-fontify handle 'emacs-lisp-mode))
 595
 596 (defun mm-display-dns-inline (handle)
 597   (mm-display-inline-fontify handle 'dns-mode))
 598
 599 ;;      id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 600 ;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
 601 (defvar mm-pkcs7-signed-magic
 602   (funcall (if (fboundp 'unibyte-string) 'unibyte-string 'string)
 603    ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
 604    ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
 605    ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
 606    ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02))
 607
 608 ;;      id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 609 ;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
 610 (defvar mm-pkcs7-enveloped-magic
 611   (funcall (if (fboundp 'unibyte-string) 'unibyte-string 'string)
 612    ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
 613    ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
 614    ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
 615    ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03))
 616
 617 (defun mm-view-pkcs7-get-type (handle)
 618   (mm-with-unibyte-buffer
 619     (mm-insert-part handle)
 620     (cond ((looking-at mm-pkcs7-enveloped-magic)
 621            'enveloped)
 622           ((looking-at mm-pkcs7-signed-magic)
 623            'signed)
 624           (t
 625            (error "Could not identify PKCS#7 type")))))
 626
 627 (defun mm-view-pkcs7 (handle)
 628   (case (mm-view-pkcs7-get-type handle)
 629     (enveloped (mm-view-pkcs7-decrypt handle))
 630     (signed (mm-view-pkcs7-verify handle))
 631     (otherwise (error "Unknown or unimplemented PKCS#7 type"))))
 632
 633 (defun mm-view-pkcs7-verify (handle)
 634   (let ((verified nil))
 635     (with-temp-buffer
 636       (insert "MIME-Version: 1.0\n")
 637       (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
 638       (insert-buffer-substring (mm-handle-buffer handle))
 639       (setq verified (smime-verify-region (point-min) (point-max))))
 640     (goto-char (point-min))
 641     (mm-insert-part handle)
 642     (if (search-forward "Content-Type: " nil t)
 643         (delete-region (point-min) (match-beginning 0)))
 644     (goto-char (point-max))
 645     (if (re-search-backward "--\r?\n?" nil t)
 646         (delete-region (match-end 0) (point-max)))
 647     (unless verified
 648       (insert-buffer-substring smime-details-buffer)))
 649   (goto-char (point-min))
 650   (while (search-forward "\r\n" nil t)
 651     (replace-match "\n"))
 652   t)
 653
 654 (defun mm-view-pkcs7-decrypt (handle)
 655   (insert-buffer-substring (mm-handle-buffer handle))
 656   (goto-char (point-min))
 657   (insert "MIME-Version: 1.0\n")
 658   (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
 659   (smime-decrypt-region
 660    (point-min) (point-max)
 661    (if (= (length smime-keys) 1)
 662        (cadar smime-keys)
 663      (smime-get-key-by-email
 664       (completing-read
 665        (concat "Decipher using key"
 666                (if smime-keys (concat "(default " (caar smime-keys) "): ")
 667                  ": "))
 668        smime-keys nil nil nil nil (car-safe (car-safe smime-keys))))))
 669   (goto-char (point-min))
 670   (while (search-forward "\r\n" nil t)
 671     (replace-match "\n"))
 672   (goto-char (point-min)))
 673
 674 (provide 'mm-view)
 675
 676 ;; arch-tag: b60e749a-d05c-47f2-bccd-bdaa59327cb2
 677 ;;; mm-view.el ends here