1 ;;; mm-view.el --- functions for viewing MIME objects
2 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002 Free Software Foundation, Inc.
4 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
5 ;; This file is part of GNU Emacs.
7 ;; GNU Emacs is free software; you can redistribute it and/or modify
8 ;; it under the terms of the GNU General Public License as published by
9 ;; the Free Software Foundation; either version 2, or (at your option)
12 ;; GNU Emacs is distributed in the hope that it will be useful,
13 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
14 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
15 ;; GNU General Public License for more details.
17 ;; You should have received a copy of the GNU General Public License
18 ;; along with GNU Emacs; see the file COPYING. If not, write to the
19 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
20 ;; Boston, MA 02111-1307, USA.
26 (eval-when-compile (require 'cl))
33 (autoload 'gnus-article-prepare-display "gnus-art")
34 (autoload 'vcard-parse-string "vcard")
35 (autoload 'vcard-format-string "vcard")
36 (autoload 'fill-flowed "flow-fill")
37 (unless (fboundp 'diff-mode)
38 (autoload 'diff-mode "diff-mode" "" t nil)))
41 ;;; Functions for displaying various formats inline
44 (defun mm-inline-image-emacs (handle)
45 (let ((b (point-marker))
48 (put-image (mm-get-image handle) b)
49 (mm-handle-set-undisplayer
51 `(lambda () (remove-images ,b (1+ ,b))))))
53 (defun mm-inline-image-xemacs (handle)
57 (annot (make-annotation (mm-get-image handle) nil 'text))
59 (mm-handle-set-undisplayer
62 (let (buffer-read-only)
63 (delete-annotation ,annot)
64 (delete-region ,(set-marker (make-marker) b)
65 ,(set-marker (make-marker) (point))))))
66 (set-extent-property annot 'mm t)
67 (set-extent-property annot 'duplicable t)))
70 (if (featurep 'xemacs)
71 (defalias 'mm-inline-image 'mm-inline-image-xemacs)
72 (defalias 'mm-inline-image 'mm-inline-image-emacs)))
74 (defvar mm-w3-setup nil)
82 (setq mm-w3-setup t)))
84 (defun mm-inline-text-html-render-with-w3 (handle)
86 (let ((text (mm-get-part handle))
88 (url-standalone-mode t)
89 (w3-honor-stylesheets nil)
90 (w3-delay-image-loads t)
92 (url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
93 (width (window-width))
94 (charset (mail-content-type-get
95 (mm-handle-type handle) 'charset)))
99 (narrow-to-region b (point))
100 (goto-char (point-min))
101 (if (or (and (boundp 'w3-meta-content-type-charset-regexp)
103 w3-meta-content-type-charset-regexp nil t))
104 (and (boundp 'w3-meta-charset-content-type-regexp)
106 w3-meta-charset-content-type-regexp nil t)))
108 (or (let ((bsubstr (buffer-substring-no-properties
111 (if (fboundp 'w3-coding-system-for-mime-charset)
112 (w3-coding-system-for-mime-charset bsubstr)
113 (mm-charset-to-coding-system bsubstr)))
115 (delete-region (point-min) (point-max))
116 (insert (mm-decode-string text charset))
117 (save-window-excursion
119 (let ((w3-strict-width width)
120 ;; Don't let w3 set the global version of
122 (fill-column fill-column)
123 (w3-honor-stylesheets nil)
124 (w3-delay-image-loads t)
125 (url-standalone-mode t))
127 (w3-region (point-min) (point-max))
129 (delete-region (point-min) (point-max))
131 (charset (mail-content-type-get
132 (mm-handle-type handle) 'charset)))
133 (if (or (eq charset 'gnus-decoded)
134 (eq mail-parse-charset 'gnus-decoded))
136 (narrow-to-region (point) (point))
137 (mm-insert-part handle)
138 (goto-char (point-max)))
139 (insert (mm-decode-string (mm-get-part handle)
142 "Error while rendering html; showing as text/plain"))))))
143 (mm-handle-set-undisplayer
146 (let (buffer-read-only)
147 (if (functionp 'remove-specifier)
148 (mapcar (lambda (prop)
150 (face-property 'default prop)
152 '(background background-pixmap foreground)))
153 (delete-region ,(point-min-marker)
154 ,(point-max-marker)))))))))
156 (defvar mm-w3m-mode-map nil
157 "Local keymap for inlined text/html part rendered by emacs-w3m. It will
158 be different from `w3m-mode-map' to use in the article buffer.")
160 (defvar mm-w3m-mode-command-alist
168 (w3m-antenna-add-current-url)
169 (w3m-bookmark-add-current-url)
170 (w3m-bookmark-add-this-url)
176 (w3m-edit-current-url)
180 (w3m-goto-url-new-session)
182 (w3m-history-restore-position)
183 (w3m-history-store-position)
186 (w3m-previous-buffer)
188 (w3m-redisplay-with-charset)
189 (w3m-reload-this-page)
190 (w3m-scroll-down-or-previous-url)
191 (w3m-scroll-up-or-next-url)
196 (w3m-view-parent-page)
197 (w3m-view-previous-page)
200 "Alist of commands to use for emacs-w3m in the article buffer. Each
201 element looks like (FROM-COMMAND . TO-COMMAND); FROM-COMMAND should be
202 registered in `w3m-mode-map' which will be substituted by TO-COMMAND
203 in `mm-w3m-mode-map'. If TO-COMMAND is nil, an article command key
204 will not be substituted.")
206 (defvar mm-w3m-mode-dont-bind-keys (list [up] [right] [left] [down])
207 "List of keys which should not be bound for the emacs-w3m commands.")
209 (defvar mm-w3m-setup nil
210 "Whether gnus-article-mode has been setup to use emacs-w3m.")
212 (defun mm-setup-w3m ()
213 "Setup gnus-article-mode to use emacs-w3m."
216 (unless mm-w3m-mode-map
217 (setq mm-w3m-mode-map (copy-keymap w3m-mode-map))
218 (dolist (def mm-w3m-mode-command-alist)
220 (substitute-key-definition (car def) (cdr def) mm-w3m-mode-map)
222 (dolist (key mm-w3m-mode-dont-bind-keys)
224 (define-key mm-w3m-mode-map key nil)
226 (unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
227 (push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
228 w3m-cid-retrieve-function-alist))
229 (setq mm-w3m-setup t)))
231 (defun mm-w3m-cid-retrieve (url &rest args)
232 "Insert a content pointed by URL if it has the cid: scheme."
233 (when (string-match "\\`cid:" url)
234 (setq url (concat "<" (substring url (match-end 0)) ">"))
236 (dolist (handle (with-current-buffer w3m-current-buffer
237 gnus-article-mime-handles))
238 (when (and (listp handle)
239 (equal url (mm-handle-id handle)))
240 (mm-insert-part handle)
241 (throw 'found-handle (mm-handle-media-type handle)))))))
243 (defun mm-inline-text-html-render-with-w3m (handle)
244 "Render a text/html part using emacs-w3m."
246 (let ((text (mm-get-part handle))
248 (charset (mail-content-type-get (mm-handle-type handle) 'charset)))
252 (narrow-to-region b (point))
253 (goto-char (point-min))
254 (when (re-search-forward w3m-meta-content-type-charset-regexp nil t)
255 (setq charset (or (w3m-charset-to-coding-system (match-string 2))
258 (delete-region (point-min) (point-max))
259 (insert (mm-decode-string text charset)))
260 (let ((w3m-safe-url-regexp (if mm-inline-text-html-with-images
263 (w3m-display-inline-images mm-inline-text-html-with-images)
265 (w3m-region (point-min) (point-max)))
266 (when mm-inline-text-html-with-w3m-keymap
268 (point-min) (point-max)
269 (append '(mm-inline-text-html-with-w3m t)
270 (gnus-local-map-property mm-w3m-mode-map)))))
271 (mm-handle-set-undisplayer
274 (let (buffer-read-only)
275 (if (functionp 'remove-specifier)
276 (mapcar (lambda (prop)
278 (face-property 'default prop)
280 '(background background-pixmap foreground)))
281 (delete-region ,(point-min-marker)
282 ,(point-max-marker))))))))
284 (defun mm-inline-text (handle)
285 (let ((type (mm-handle-media-subtype handle))
289 (funcall mm-inline-text-html-renderer handle))
290 ((equal type "x-vcard")
295 (if (fboundp 'vcard-pretty-print)
296 (vcard-pretty-print (mm-get-part handle))
298 (vcard-parse-string (mm-get-part handle)
299 'vcard-standard-filter)))))))
302 (charset (mail-content-type-get
303 (mm-handle-type handle) 'charset)))
304 (if (or (eq charset 'gnus-decoded)
305 ;; This is probably not entirely correct, but
306 ;; makes rfc822 parts with embedded multiparts work.
307 (eq mail-parse-charset 'gnus-decoded))
309 (narrow-to-region (point) (point))
310 (mm-insert-part handle)
311 (goto-char (point-max)))
312 (insert (mm-decode-string (mm-get-part handle) charset)))
313 (when (and (equal type "plain")
314 (equal (cdr (assoc 'format (mm-handle-type handle)))
317 (narrow-to-region b (point))
320 (goto-char (point-max))))
322 (narrow-to-region b (point))
323 (set-text-properties (point-min) (point-max) nil)
324 (when (or (equal type "enriched")
325 (equal type "richtext"))
326 (enriched-decode (point-min) (point-max)))
327 (mm-handle-set-undisplayer
330 (let (buffer-read-only)
331 (delete-region ,(point-min-marker)
332 ,(point-max-marker)))))))))))
334 (defun mm-insert-inline (handle text)
335 "Insert TEXT inline from HANDLE."
338 (mm-handle-set-undisplayer
341 (let (buffer-read-only)
342 (delete-region ,(set-marker (make-marker) b)
343 ,(set-marker (make-marker) (point))))))))
345 (defun mm-inline-audio (handle)
346 (message "Not implemented"))
348 (defun mm-view-sound-file ()
349 (message "Not implemented"))
351 (defun mm-w3-prepare-buffer ()
353 (let ((url-standalone-mode t)
354 (w3-honor-stylesheets nil)
355 (w3-delay-image-loads t))
356 (w3-prepare-buffer)))
358 (defun mm-view-message ()
359 (mm-enable-multibyte)
361 (let (gnus-article-mime-handles)
362 ;; Double decode problem may happen. See mm-inline-message.
363 (run-hooks 'gnus-article-decode-hook)
364 (gnus-article-prepare-display)
365 (setq handles gnus-article-mime-handles))
367 (setq gnus-article-mime-handles
368 (mm-merge-handles gnus-article-mime-handles handles))))
370 (goto-char (point-min)))
372 (defun mm-inline-message (handle)
375 (charset (mail-content-type-get
376 (mm-handle-type handle) 'charset))
377 gnus-displaying-mime handles)
380 (setq charset (intern (downcase charset)))
381 (when (eq charset 'us-ascii)
385 (narrow-to-region b b)
386 (mm-insert-part handle)
387 (let (gnus-article-mime-handles
388 ;; disable prepare hook
389 gnus-article-prepare-hook
390 (gnus-newsgroup-charset
391 (or charset gnus-newsgroup-charset)))
392 (run-hooks 'gnus-article-decode-hook)
393 (gnus-article-prepare-display)
394 (setq handles gnus-article-mime-handles))
395 (goto-char (point-min))
398 (goto-char (point-max))
401 (insert "----------\n\n")
403 (setq gnus-article-mime-handles
404 (mm-merge-handles gnus-article-mime-handles handles)))
405 (mm-handle-set-undisplayer
408 (let (buffer-read-only)
409 (if (fboundp 'remove-specifier)
410 ;; This is only valid on XEmacs.
411 (mapcar (lambda (prop)
413 (face-property 'default prop) (current-buffer)))
414 '(background background-pixmap foreground)))
415 (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
417 (defun mm-display-inline-fontify (handle mode)
419 ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
420 ;; on for buffers whose name begins with " ". That's why we use
421 ;; save-current-buffer/get-buffer-create rather than
424 (set-buffer (generate-new-buffer "*fontification*"))
427 (buffer-disable-undo)
428 (mm-insert-part handle)
431 (let ((font-lock-verbose nil))
432 ;; I find font-lock a bit too verbose.
433 (font-lock-fontify-buffer))
434 ;; By default, XEmacs font-lock uses non-duplicable text
435 ;; properties. This code forces all the text properties
436 ;; to be copied along with the text.
437 (when (fboundp 'extent-list)
438 (map-extents (lambda (ext ignored)
439 (set-extent-property ext 'duplicable t)
441 nil nil nil nil nil 'text-prop))
442 (setq text (buffer-string)))
443 (kill-buffer (current-buffer))))
444 (mm-insert-inline handle text)))
446 ;; Shouldn't these functions check whether the user even wants to use
447 ;; font-lock? At least under XEmacs, this fontification is pretty
448 ;; much unconditional. Also, it would be nice to change for the size
449 ;; of the fontified region.
451 (defun mm-display-patch-inline (handle)
452 (mm-display-inline-fontify handle 'diff-mode))
454 (defun mm-display-elisp-inline (handle)
455 (mm-display-inline-fontify handle 'emacs-lisp-mode))
457 ;; id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
458 ;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
459 (defvar mm-pkcs7-signed-magic
460 (mm-string-as-unibyte
462 (mapcar 'char-to-string
463 (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
464 ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
465 ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
466 ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02)))))
468 ;; id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
469 ;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
470 (defvar mm-pkcs7-enveloped-magic
471 (mm-string-as-unibyte
473 (mapcar 'char-to-string
474 (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
475 ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
476 ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
477 ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03)))))
479 (defun mm-view-pkcs7-get-type (handle)
480 (mm-with-unibyte-buffer
481 (mm-insert-part handle)
482 (cond ((looking-at mm-pkcs7-enveloped-magic)
484 ((looking-at mm-pkcs7-signed-magic)
487 (error "Could not identify PKCS#7 type")))))
489 (defun mm-view-pkcs7 (handle)
490 (case (mm-view-pkcs7-get-type handle)
491 (enveloped (mm-view-pkcs7-decrypt handle))
492 (otherwise (error "Unknown or unimplemented PKCS#7 type"))))
494 (defun mm-view-pkcs7-decrypt (handle)
495 (insert-buffer (mm-handle-buffer handle))
496 (goto-char (point-min))
497 (insert "MIME-Version: 1.0\n")
498 (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
499 (smime-decrypt-region
500 (point-min) (point-max)
501 (if (= (length smime-keys) 1)
503 (smime-get-key-by-email
504 (completing-read "Decrypt this part with which key? "
506 (and (listp (car-safe smime-keys))
507 (caar smime-keys)))))))
511 ;;; mm-view.el ends here