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 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 (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 (buffer-read-only)
 267               (if (functionp 'remove-specifier)
 268                   (mapcar (lambda (prop)
 269                             (remove-specifier
 270                              (face-property 'default prop)
 271                              (current-buffer)))
 272                           '(background background-pixmap foreground)))
 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#s!!#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          buffer-read-only)
 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 (buffer-read-only)
 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         buffer-read-only)
 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)
 432         (goto-char (point-max))))
 433     (save-restriction
 434       (narrow-to-region b (point))
 435       (when (or (equal type "enriched")
 436                 (equal type "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 (buffer-read-only)
 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     (mm-handle-set-undisplayer
 452      handle
 453      `(lambda ()
 454         (let (buffer-read-only)
 455           (delete-region ,(set-marker (make-marker) b)
 456                          ,(set-marker (make-marker) (point))))))))
 457
 458 (defun mm-inline-audio (handle)
 459   (message "Not implemented"))
 460
 461 (defun mm-view-sound-file ()
 462   (message "Not implemented"))
 463
 464 (defun mm-w3-prepare-buffer ()
 465   (require 'w3)
 466   (let ((url-standalone-mode t)
 467         (url-gateway-unplugged t)
 468         (w3-honor-stylesheets nil))
 469     (w3-prepare-buffer)))
 470
 471 (defun mm-view-message ()
 472   (mm-enable-multibyte)
 473   (let (handles)
 474     (let (gnus-article-mime-handles)
 475       ;; Double decode problem may happen.  See mm-inline-message.
 476       (run-hooks 'gnus-article-decode-hook)
 477       (gnus-article-prepare-display)
 478       (setq handles gnus-article-mime-handles))
 479     (when handles
 480       (setq gnus-article-mime-handles
 481             (mm-merge-handles gnus-article-mime-handles handles))))
 482   (fundamental-mode)
 483   (goto-char (point-min)))
 484
 485 (defun mm-inline-message (handle)
 486   (let ((b (point))
 487         (bolp (bolp))
 488         (charset (mail-content-type-get
 489                   (mm-handle-type handle) 'charset))
 490         gnus-displaying-mime handles)
 491     (when (and charset
 492                (stringp charset))
 493       (setq charset (intern (downcase charset)))
 494       (when (eq charset 'us-ascii)
 495         (setq charset nil)))
 496     (save-excursion
 497       (save-restriction
 498         (narrow-to-region b b)
 499         (mm-insert-part handle)
 500         (let (gnus-article-mime-handles
 501               ;; disable prepare hook
 502               gnus-article-prepare-hook
 503               (gnus-newsgroup-charset
 504                (unless (eq charset 'gnus-decoded) ;; mm-uu might set it.
 505                  (or charset gnus-newsgroup-charset))))
 506           (let ((gnus-original-article-buffer (mm-handle-buffer handle)))
 507             (run-hooks 'gnus-article-decode-hook))
 508           (gnus-article-prepare-display)
 509           (setq handles gnus-article-mime-handles))
 510         (goto-char (point-min))
 511         (unless bolp
 512           (insert "\n"))
 513         (goto-char (point-max))
 514         (unless (bolp)
 515           (insert "\n"))
 516         (insert "----------\n\n")
 517         (when handles
 518           (setq gnus-article-mime-handles
 519                 (mm-merge-handles gnus-article-mime-handles handles)))
 520         (mm-handle-set-undisplayer
 521          handle
 522          `(lambda ()
 523             (let (buffer-read-only)
 524               (if (fboundp 'remove-specifier)
 525                   ;; This is only valid on XEmacs.
 526                   (mapcar (lambda (prop)
 527                             (remove-specifier
 528                              (face-property 'default prop) (current-buffer)))
 529                           '(background background-pixmap foreground)))
 530               (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
 531
 532 (defun mm-display-inline-fontify (handle mode)
 533   (let (text)
 534     ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
 535     ;; on for buffers whose name begins with " ".  That's why we use
 536     ;; save-current-buffer/get-buffer-create rather than
 537     ;; with-temp-buffer.
 538     (save-current-buffer
 539       (set-buffer (generate-new-buffer "*fontification*"))
 540       (unwind-protect
 541           (progn
 542             (buffer-disable-undo)
 543             (mm-insert-part handle)
 544             (require 'font-lock)
 545             (let ((font-lock-maximum-size nil)
 546                   ;; Disable support modes, e.g., jit-lock, lazy-lock, etc.
 547                   (font-lock-mode-hook nil)
 548                   (font-lock-support-mode nil)
 549                   ;; I find font-lock a bit too verbose.
 550                   (font-lock-verbose nil))
 551               (funcall mode)
 552               ;; The mode function might have already turned on font-lock.
 553               (unless (symbol-value 'font-lock-mode)
 554                 (font-lock-fontify-buffer)))
 555             ;; By default, XEmacs font-lock uses non-duplicable text
 556             ;; properties.  This code forces all the text properties
 557             ;; to be copied along with the text.
 558             (when (fboundp 'extent-list)
 559               (map-extents (lambda (ext ignored)
 560                              (set-extent-property ext 'duplicable t)
 561                              nil)
 562                            nil nil nil nil nil 'text-prop))
 563             (setq text (buffer-string)))
 564         (kill-buffer (current-buffer))))
 565     (mm-insert-inline handle text)))
 566
 567 ;; Shouldn't these functions check whether the user even wants to use
 568 ;; font-lock?  At least under XEmacs, this fontification is pretty
 569 ;; much unconditional.  Also, it would be nice to change for the size
 570 ;; of the fontified region.
 571
 572 (defun mm-display-patch-inline (handle)
 573   (mm-display-inline-fontify handle 'diff-mode))
 574
 575 (defun mm-display-elisp-inline (handle)
 576   (mm-display-inline-fontify handle 'emacs-lisp-mode))
 577
 578 ;;      id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 579 ;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
 580 (defvar mm-pkcs7-signed-magic
 581   (mm-string-as-unibyte
 582    (apply 'concat
 583           (mapcar 'char-to-string
 584                   (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
 585                         ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
 586                         ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
 587                         ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02)))))
 588
 589 ;;      id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
 590 ;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
 591 (defvar mm-pkcs7-enveloped-magic
 592   (mm-string-as-unibyte
 593    (apply 'concat
 594           (mapcar 'char-to-string
 595                   (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
 596                         ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
 597                         ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
 598                         ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03)))))
 599
 600 (defun mm-view-pkcs7-get-type (handle)
 601   (mm-with-unibyte-buffer
 602     (mm-insert-part handle)
 603     (cond ((looking-at mm-pkcs7-enveloped-magic)
 604            'enveloped)
 605           ((looking-at mm-pkcs7-signed-magic)
 606            'signed)
 607           (t
 608            (error "Could not identify PKCS#7 type")))))
 609
 610 (defun mm-view-pkcs7 (handle)
 611   (case (mm-view-pkcs7-get-type handle)
 612     (enveloped (mm-view-pkcs7-decrypt handle))
 613     (signed (mm-view-pkcs7-verify handle))
 614     (otherwise (error "Unknown or unimplemented PKCS#7 type"))))
 615
 616 (defun mm-view-pkcs7-verify (handle)
 617   ;; A bogus implementation of PKCS#7. FIXME::
 618   (mm-insert-part handle)
 619   (goto-char (point-min))
 620   (if (search-forward "Content-Type: " nil t)
 621       (delete-region (point-min) (match-beginning 0)))
 622   (goto-char (point-max))
 623   (if (re-search-backward "--\r?\n?" nil t)
 624       (delete-region (match-end 0) (point-max)))
 625   (goto-char (point-min))
 626   (while (search-forward "\r\n" nil t)
 627     (replace-match "\n"))
 628   (message "Verify signed PKCS#7 message is unimplemented.")
 629   (sit-for 1)
 630   t)
 631
 632 (autoload 'gnus-completing-read-maybe-default "gnus-util" nil nil 'macro)
 633
 634 (defun mm-view-pkcs7-decrypt (handle)
 635   (insert-buffer-substring (mm-handle-buffer handle))
 636   (goto-char (point-min))
 637   (insert "MIME-Version: 1.0\n")
 638   (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
 639   (smime-decrypt-region
 640    (point-min) (point-max)
 641    (if (= (length smime-keys) 1)
 642        (cadar smime-keys)
 643      (smime-get-key-by-email
 644       (gnus-completing-read-maybe-default
 645        (concat "Decipher using key"
 646                (if smime-keys
 647                    (concat " (default " (caar smime-keys) "): ")
 648                  ": "))
 649        smime-keys nil nil nil nil (car-safe (car-safe smime-keys))))))
 650   (goto-char (point-min))
 651   (while (search-forward "\r\n" nil t)
 652     (replace-match "\n"))
 653   (goto-char (point-min)))
 654
 655 (provide 'mm-view)
 656
 657 ;;; arch-tag: b60e749a-d05c-47f2-bccd-bdaa59327cb2
 658 ;;; mm-view.el ends here