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