1 ;;; mm-view.el --- Functions for viewing MIME objects
2 ;; Copyright (C) 1998, 1999, 2000, 2001 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
43 (defun mm-inline-image-emacs (handle)
44 (let ((b (point-marker))
47 (put-image (mm-get-image handle) b)
48 (mm-handle-set-undisplayer
50 `(lambda () (remove-images ,b (1+ ,b))))))
52 (defun mm-inline-image-xemacs (handle)
56 (annot (make-annotation (mm-get-image handle) nil 'text))
58 (mm-handle-set-undisplayer
61 (let (buffer-read-only)
62 (delete-annotation ,annot)
63 (delete-region ,(set-marker (make-marker) b)
64 ,(set-marker (make-marker) (point))))))
65 (set-extent-property annot 'mm t)
66 (set-extent-property annot 'duplicable t)))
69 (if (featurep 'xemacs)
70 (defalias 'mm-inline-image 'mm-inline-image-xemacs)
71 (defalias 'mm-inline-image 'mm-inline-image-emacs)))
73 (defvar mm-w3-setup nil)
81 (setq mm-w3-setup t)))
83 (defun mm-inline-text (handle)
84 (let ((type (mm-handle-media-subtype handle))
85 text buffer-read-only)
89 (setq text (mm-get-part handle))
91 (url-standalone-mode t)
93 (url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
94 (width (window-width))
95 (charset (mail-content-type-get
96 (mm-handle-type handle) 'charset)))
100 (narrow-to-region b (point))
101 (goto-char (point-min))
102 (if (or (and (boundp 'w3-meta-content-type-charset-regexp)
104 w3-meta-content-type-charset-regexp nil t))
105 (and (boundp 'w3-meta-charset-content-type-regexp)
107 w3-meta-charset-content-type-regexp nil t)))
109 (or (let ((bsubstr (buffer-substring-no-properties
112 (if (fboundp 'w3-coding-system-for-mime-charset)
113 (w3-coding-system-for-mime-charset bsubstr)
114 (mm-charset-to-coding-system bsubstr)))
116 (delete-region (point-min) (point-max))
117 (insert (mm-decode-string text charset))
118 (save-window-excursion
120 (let ((w3-strict-width width)
121 ;; Don't let w3 set the global version of
123 (fill-column fill-column)
124 (url-standalone-mode t))
126 (w3-region (point-min) (point-max))
128 (delete-region (point-min) (point-max))
130 (charset (mail-content-type-get
131 (mm-handle-type handle) 'charset)))
132 (if (or (eq charset 'gnus-decoded)
133 (eq mail-parse-charset 'gnus-decoded))
135 (narrow-to-region (point) (point))
136 (mm-insert-part handle)
137 (goto-char (point-max)))
138 (insert (mm-decode-string (mm-get-part handle)
141 "Error while rendering html; showing as text/plain"))))))
142 (mm-handle-set-undisplayer
145 (let (buffer-read-only)
146 (if (functionp 'remove-specifier)
147 (mapcar (lambda (prop)
149 (face-property 'default prop)
151 '(background background-pixmap foreground)))
152 (delete-region ,(point-min-marker)
153 ,(point-max-marker)))))))))
154 ((or (equal type "enriched")
155 (equal type "richtext"))
157 (mm-with-unibyte-buffer
158 (mm-insert-part handle)
159 (save-window-excursion
160 (enriched-decode (point-min) (point-max))
161 (setq text (buffer-string)))))
162 (mm-insert-inline handle text))
163 ((equal type "x-vcard")
167 (if (fboundp 'vcard-pretty-print)
168 (vcard-pretty-print (mm-get-part handle))
170 (vcard-parse-string (mm-get-part handle)
171 'vcard-standard-filter))))))
174 (charset (mail-content-type-get
175 (mm-handle-type handle) 'charset)))
176 (if (or (eq charset 'gnus-decoded)
177 ;; This is probably not entirely correct, but
178 ;; makes rfc822 parts with embedded multiparts work.
179 (eq mail-parse-charset 'gnus-decoded))
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) charset)))
185 (when (and (equal type "plain")
186 (equal (cdr (assoc 'format (mm-handle-type handle)))
189 (narrow-to-region b (point))
192 (goto-char (point-max))))
194 (narrow-to-region b (point))
195 (set-text-properties (point-min) (point-max) nil)
196 (mm-handle-set-undisplayer
199 (let (buffer-read-only)
200 (delete-region ,(point-min-marker)
201 ,(point-max-marker)))))))))))
203 (defun mm-insert-inline (handle text)
204 "Insert TEXT inline from HANDLE."
207 (mm-handle-set-undisplayer
210 (let (buffer-read-only)
211 (delete-region ,(set-marker (make-marker) b)
212 ,(set-marker (make-marker) (point))))))))
214 (defun mm-inline-audio (handle)
215 (message "Not implemented"))
217 (defun mm-view-sound-file ()
218 (message "Not implemented"))
220 (defun mm-w3-prepare-buffer ()
222 (let ((url-standalone-mode t))
223 (w3-prepare-buffer)))
225 (defun mm-view-message ()
226 (mm-enable-multibyte)
228 (let (gnus-article-mime-handles)
229 ;; Double decode problem may happen. See mm-inline-message.
230 (run-hooks 'gnus-article-decode-hook)
231 (gnus-article-prepare-display)
232 (setq handles gnus-article-mime-handles))
234 (setq gnus-article-mime-handles
235 (mm-merge-handles gnus-article-mime-handles handles))))
237 (goto-char (point-min)))
239 (defun mm-inline-message (handle)
242 (charset (mail-content-type-get
243 (mm-handle-type handle) 'charset))
244 gnus-displaying-mime handles)
247 (setq charset (intern (downcase charset)))
248 (when (eq charset 'us-ascii)
252 (narrow-to-region b b)
253 (mm-insert-part handle)
254 (let (gnus-article-mime-handles
255 ;; disable prepare hook
256 gnus-article-prepare-hook
257 (gnus-newsgroup-charset
258 (or charset gnus-newsgroup-charset)))
259 (run-hooks 'gnus-article-decode-hook)
260 (gnus-article-prepare-display)
261 (setq handles gnus-article-mime-handles))
262 (goto-char (point-min))
265 (goto-char (point-max))
268 (insert "----------\n\n")
270 (setq gnus-article-mime-handles
271 (mm-merge-handles gnus-article-mime-handles handles)))
272 (mm-handle-set-undisplayer
275 (let (buffer-read-only)
276 (if (fboundp 'remove-specifier)
277 ;; This is only valid on XEmacs.
278 (mapcar (lambda (prop)
280 (face-property 'default prop) (current-buffer)))
281 '(background background-pixmap foreground)))
282 (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
284 (defun mm-display-inline-fontify (handle mode)
286 ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
287 ;; on for buffers whose name begins with " ". That's why we use
288 ;; save-current-buffer/get-buffer-create rather than
291 (set-buffer (generate-new-buffer "*fontification*"))
294 (buffer-disable-undo)
295 (mm-insert-part handle)
297 (let ((font-lock-verbose nil))
298 ;; I find font-lock a bit too verbose.
299 (font-lock-fontify-buffer))
300 ;; By default, XEmacs font-lock uses non-duplicable text
301 ;; properties. This code forces all the text properties
302 ;; to be copied along with the text.
303 (when (fboundp 'extent-list)
304 (map-extents (lambda (ext ignored)
305 (set-extent-property ext 'duplicable t)
307 nil nil nil nil nil 'text-prop))
308 (setq text (buffer-string)))
309 (kill-buffer (current-buffer))))
310 (mm-insert-inline handle text)))
312 ;; Shouldn't these functions check whether the user even wants to use
313 ;; font-lock? At least under XEmacs, this fontification is pretty
314 ;; much unconditional. Also, it would be nice to change for the size
315 ;; of the fontified region.
317 (defun mm-display-patch-inline (handle)
318 (mm-display-inline-fontify handle 'diff-mode))
320 (defun mm-display-elisp-inline (handle)
321 (mm-display-inline-fontify handle 'emacs-lisp-mode))
323 ;; id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
324 ;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
325 (defvar mm-pkcs7-signed-magic
326 (mm-string-as-unibyte
328 (mapcar 'char-to-string
329 (list ?\x30 ?\x82 ?\x01 ?\x91 ?\x06 ?\x09 ?\x2a ?\x86 ?\x48
330 ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02)))))
332 ;; id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
333 ;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
334 (defvar mm-pkcs7-enveloped-magic
335 (mm-string-as-unibyte
337 (mapcar 'char-to-string
338 (list ?\x30 ?\x82 ?\x01 ?\x91 ?\x06 ?\x09 ?\x2a ?\x86 ?\x48
339 ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03)))))
341 (defun mm-view-pkcs7-get-type (handle)
343 (mm-insert-part handle)
344 (cond ((looking-at (regexp-quote mm-pkcs7-enveloped-magic))
346 ((looking-at (regexp-quote mm-pkcs7-signed-magic))
349 (error "Could not identify PKCS#7 type")))))
351 (defun mm-view-pkcs7 (handle)
352 (case (mm-view-pkcs7-get-type handle)
353 (enveloped (mm-view-pkcs7-decrypt handle))
354 (otherwise (error "Unknown or unimplemented PKCS#7 type"))))
356 (defun mm-view-pkcs7-decrypt (handle)
358 ((eq mm-decrypt-option 'never) nil)
359 ((eq mm-decrypt-option 'always) t)
360 ((eq mm-decrypt-option 'known) t)
362 (format "Decrypt (S/MIME) part? "))))
365 (insert-buffer (mm-handle-buffer handle))
366 (goto-char (point-min))
367 (insert "MIME-Version: 1.0\n")
368 (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
369 (smime-decrypt-region
370 (point-min) (point-max)
371 (if (= (length smime-keys) 1)
373 (smime-get-key-by-email
374 (completing-read "Decrypt this part with which key? "
376 (and (listp (car-safe smime-keys))
377 (caar smime-keys))))))
378 (setq res (buffer-string)))
379 (mm-insert-inline handle res))))
383 ;;; mm-view.el ends here