1 ;;; mm-view.el --- functions for viewing MIME objects
2 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
3 ;; Free Software Foundation, Inc.
5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
6 ;; This file is part of GNU Emacs.
8 ;; GNU Emacs is free software; you can redistribute it and/or modify
9 ;; it under the terms of the GNU General Public License as published by
10 ;; the Free Software Foundation; either version 2, or (at your option)
13 ;; GNU Emacs is distributed in the hope that it will be useful,
14 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
15 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
16 ;; GNU General Public License for more details.
18 ;; You should have received a copy of the GNU General Public License
19 ;; along with GNU Emacs; see the file COPYING. If not, write to the
20 ;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
21 ;; Boston, MA 02111-1307, USA.
27 (eval-when-compile (require 'cl))
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")
39 (unless (fboundp 'diff-mode)
40 (autoload 'diff-mode "diff-mode" "" t nil)))
42 (defvar mm-text-html-renderer-alist
43 '((w3 . mm-inline-text-html-render-with-w3)
44 (w3m . mm-inline-text-html-render-with-w3m)
45 (w3m-standalone mm-inline-render-with-stdin nil
46 "w3m" "-dump" "-T" "text/html")
47 (links mm-inline-render-with-file
48 mm-links-remove-leading-blank
50 (lynx mm-inline-render-with-stdin nil
51 "lynx" "-dump" "-force_html" "-stdin" "-nolist")
52 (html2text mm-inline-render-with-function html2text))
53 "The attributes of renderer types for text/html.")
55 (defvar mm-text-html-washer-alist
56 '((w3 . gnus-article-wash-html-with-w3)
57 (w3m . gnus-article-wash-html-with-w3m)
58 (w3m-standalone mm-inline-wash-with-stdin nil
59 "w3m" "-dump" "-T" "text/html")
60 (links mm-inline-wash-with-file
61 mm-links-remove-leading-blank
63 (lynx mm-inline-wash-with-stdin nil
64 "lynx" "-dump" "-force_html" "-stdin" "-nolist")
65 (html2text html2text))
66 "The attributes of washer types for text/html.")
68 ;;; Internal variables.
71 ;;; Functions for displaying various formats inline
74 (defun mm-inline-image-emacs (handle)
75 (let ((b (point-marker))
77 (put-image (mm-get-image handle) b)
79 (mm-handle-set-undisplayer
85 (delete-region b (+ b 2)))))))
87 (defun mm-inline-image-xemacs (handle)
90 (let ((annot (make-annotation (mm-get-image handle) nil 'text))
92 (mm-handle-set-undisplayer
95 (let ((b ,(point-marker))
97 (delete-annotation ,annot)
98 (delete-region (- b 2) b))))
99 (set-extent-property annot 'mm t)
100 (set-extent-property annot 'duplicable t)))
103 (if (featurep 'xemacs)
104 (defalias 'mm-inline-image 'mm-inline-image-xemacs)
105 (defalias 'mm-inline-image 'mm-inline-image-emacs)))
107 (defvar mm-w3-setup nil)
108 (defun mm-setup-w3 ()
115 (setq mm-w3-setup t)))
117 (defun mm-inline-text-html-render-with-w3 (handle)
119 (let ((text (mm-get-part handle))
121 (url-standalone-mode t)
122 (url-gateway-unplugged t)
123 (w3-honor-stylesheets nil)
125 (url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
126 (width (window-width))
127 (charset (mail-content-type-get
128 (mm-handle-type handle) 'charset)))
132 (narrow-to-region b (point))
133 (goto-char (point-min))
134 (if (or (and (boundp 'w3-meta-content-type-charset-regexp)
136 w3-meta-content-type-charset-regexp nil t))
137 (and (boundp 'w3-meta-charset-content-type-regexp)
139 w3-meta-charset-content-type-regexp nil t)))
141 (or (let ((bsubstr (buffer-substring-no-properties
144 (if (fboundp 'w3-coding-system-for-mime-charset)
145 (w3-coding-system-for-mime-charset bsubstr)
146 (mm-charset-to-coding-system bsubstr)))
148 (delete-region (point-min) (point-max))
149 (insert (mm-decode-string text charset))
150 (save-window-excursion
152 (let ((w3-strict-width width)
153 ;; Don't let w3 set the global version of
155 (fill-column fill-column))
156 (if (or debug-on-error debug-on-quit)
157 (w3-region (point-min) (point-max))
159 (w3-region (point-min) (point-max))
161 (delete-region (point-min) (point-max))
163 (charset (mail-content-type-get
164 (mm-handle-type handle) 'charset)))
165 (if (or (eq charset 'gnus-decoded)
166 (eq mail-parse-charset 'gnus-decoded))
168 (narrow-to-region (point) (point))
169 (mm-insert-part handle)
170 (goto-char (point-max)))
171 (insert (mm-decode-string (mm-get-part handle)
174 "Error while rendering html; showing as text/plain")))))))
175 (mm-handle-set-undisplayer
178 (let (buffer-read-only)
179 (if (functionp 'remove-specifier)
180 (mapcar (lambda (prop)
182 (face-property 'default prop)
184 '(background background-pixmap foreground)))
185 (delete-region ,(point-min-marker)
186 ,(point-max-marker)))))))))
188 (defvar mm-w3m-setup nil
189 "Whether gnus-article-mode has been setup to use emacs-w3m.")
191 (defun mm-setup-w3m ()
192 "Setup gnus-article-mode to use emacs-w3m."
195 (unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
196 (push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
197 w3m-cid-retrieve-function-alist))
198 (setq mm-w3m-setup t))
199 (setq w3m-display-inline-images mm-inline-text-html-with-images))
201 (defun mm-w3m-cid-retrieve-1 (url handle)
202 (if (mm-multiple-handles handle)
203 (dolist (elem handle)
204 (mm-w3m-cid-retrieve-1 url elem))
205 (when (and (listp handle)
206 (equal url (mm-handle-id handle)))
207 (mm-insert-part handle)
208 (throw 'found-handle (mm-handle-media-type handle)))))
210 (defun mm-w3m-cid-retrieve (url &rest args)
211 "Insert a content pointed by URL if it has the cid: scheme."
212 (when (string-match "\\`cid:" url)
214 (mm-w3m-cid-retrieve-1 (concat "<" (substring url (match-end 0)) ">")
215 (with-current-buffer w3m-current-buffer
216 gnus-article-mime-handles)))))
218 (defun mm-inline-text-html-render-with-w3m (handle)
219 "Render a text/html part using emacs-w3m."
221 (let ((text (mm-get-part handle))
223 (charset (mail-content-type-get (mm-handle-type handle) 'charset)))
225 (insert (if charset (mm-decode-string text charset) text))
227 (narrow-to-region b (point))
229 (goto-char (point-min))
230 (when (setq charset (w3m-detect-meta-charset))
231 (delete-region (point-min) (point-max))
232 (insert (mm-decode-string text charset))))
233 (let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
235 (w3m-region (point-min) (point-max) nil charset))
236 (when (and mm-inline-text-html-with-w3m-keymap
237 (boundp 'w3m-minor-mode-map)
240 (point-min) (point-max)
241 (list 'keymap w3m-minor-mode-map
242 ;; Put the mark meaning this part was rendered by emacs-w3m.
243 'mm-inline-text-html-with-w3m t))))
244 (mm-handle-set-undisplayer
247 (let (buffer-read-only)
248 (if (functionp 'remove-specifier)
249 (mapcar (lambda (prop)
251 (face-property 'default prop)
253 '(background background-pixmap foreground)))
254 (delete-region ,(point-min-marker)
255 ,(point-max-marker))))))))
257 (defun mm-links-remove-leading-blank ()
258 ;; Delete the annoying three spaces preceding each line of links
260 (goto-char (point-min))
261 (while (re-search-forward "^ " nil t)
262 (delete-region (match-beginning 0) (match-end 0))))
264 (defun mm-inline-wash-with-file (post-func cmd &rest args)
265 (let ((file (mm-make-temp-file
266 (expand-file-name "mm" mm-tmp-directory))))
267 (let ((coding-system-for-write 'binary))
268 (write-region (point-min) (point-max) file nil 'silent))
269 (delete-region (point-min) (point-max))
271 (apply 'call-process cmd nil t nil (mapcar 'eval args))
273 (and post-func (funcall post-func))))
275 (defun mm-inline-wash-with-stdin (post-func cmd &rest args)
276 (let ((coding-system-for-write 'binary))
277 (apply 'call-process-region (point-min) (point-max)
279 (and post-func (funcall post-func)))
281 (defun mm-inline-render-with-file (handle post-func cmd &rest args)
282 (let ((source (mm-get-part handle)))
285 (mm-with-unibyte-buffer
287 (apply 'mm-inline-wash-with-file post-func cmd args)
290 (defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
291 (let ((source (mm-get-part handle)))
294 (mm-with-unibyte-buffer
296 (apply 'mm-inline-wash-with-stdin post-func cmd args)
299 (defun mm-inline-render-with-function (handle func &rest args)
300 (let ((source (mm-get-part handle))
301 (charset (mail-content-type-get (mm-handle-type handle) 'charset)))
304 (mm-with-multibyte-buffer
306 (mm-decode-string source charset)
311 (defun mm-inline-text-html (handle)
312 (let* ((func (or mm-inline-text-html-renderer mm-text-html-renderer))
313 (entry (assq func mm-text-html-renderer-alist))
316 (setq func (cdr entry)))
319 (funcall func handle))
321 (apply (car func) handle (cdr func))))))
323 (defun mm-inline-text-vcard (handle)
324 (let (buffer-read-only)
329 (if (fboundp 'vcard-pretty-print)
330 (vcard-pretty-print (mm-get-part handle))
332 (vcard-parse-string (mm-get-part handle)
333 'vcard-standard-filter))))))))
335 (defun mm-inline-text (handle)
337 (type (mm-handle-media-subtype handle))
338 (charset (mail-content-type-get
339 (mm-handle-type handle) 'charset))
341 (if (or (eq charset 'gnus-decoded)
342 ;; This is probably not entirely correct, but
343 ;; makes rfc822 parts with embedded multiparts work.
344 (eq mail-parse-charset 'gnus-decoded))
346 (narrow-to-region (point) (point))
347 (mm-insert-part handle)
348 (goto-char (point-max)))
349 (insert (mm-decode-string (mm-get-part handle) charset)))
350 (when (and (equal type "plain")
351 (equal (cdr (assoc 'format (mm-handle-type handle)))
354 (narrow-to-region b (point))
357 (goto-char (point-max))))
359 (narrow-to-region b (point))
360 (set-text-properties (point-min) (point-max) nil)
361 (when (or (equal type "enriched")
362 (equal type "richtext"))
364 (enriched-decode (point-min) (point-max))))
365 (mm-handle-set-undisplayer
368 (let (buffer-read-only)
369 (delete-region ,(point-min-marker)
370 ,(point-max-marker))))))))
372 (defun mm-insert-inline (handle text)
373 "Insert TEXT inline from HANDLE."
376 (mm-handle-set-undisplayer
379 (let (buffer-read-only)
380 (delete-region ,(set-marker (make-marker) b)
381 ,(set-marker (make-marker) (point))))))))
383 (defun mm-inline-audio (handle)
384 (message "Not implemented"))
386 (defun mm-view-sound-file ()
387 (message "Not implemented"))
389 (defun mm-w3-prepare-buffer ()
391 (let ((url-standalone-mode t)
392 (url-gateway-unplugged t)
393 (w3-honor-stylesheets nil))
394 (w3-prepare-buffer)))
396 (defun mm-view-message ()
397 (mm-enable-multibyte)
399 (let (gnus-article-mime-handles)
400 ;; Double decode problem may happen. See mm-inline-message.
401 (run-hooks 'gnus-article-decode-hook)
402 (gnus-article-prepare-display)
403 (setq handles gnus-article-mime-handles))
405 (setq gnus-article-mime-handles
406 (mm-merge-handles gnus-article-mime-handles handles))))
408 (goto-char (point-min)))
410 (defun mm-inline-message (handle)
413 (charset (mail-content-type-get
414 (mm-handle-type handle) 'charset))
415 gnus-displaying-mime handles)
418 (setq charset (intern (downcase charset)))
419 (when (eq charset 'us-ascii)
423 (narrow-to-region b b)
424 (mm-insert-part handle)
425 (let (gnus-article-mime-handles
426 ;; disable prepare hook
427 gnus-article-prepare-hook
428 (gnus-newsgroup-charset
429 (or charset gnus-newsgroup-charset)))
430 (let ((gnus-original-article-buffer (mm-handle-buffer handle)))
431 (run-hooks 'gnus-article-decode-hook))
432 (gnus-article-prepare-display)
433 (setq handles gnus-article-mime-handles))
434 (goto-char (point-min))
437 (goto-char (point-max))
440 (insert "----------\n\n")
442 (setq gnus-article-mime-handles
443 (mm-merge-handles gnus-article-mime-handles handles)))
444 (mm-handle-set-undisplayer
447 (let (buffer-read-only)
448 (if (fboundp 'remove-specifier)
449 ;; This is only valid on XEmacs.
450 (mapcar (lambda (prop)
452 (face-property 'default prop) (current-buffer)))
453 '(background background-pixmap foreground)))
454 (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
456 (defun mm-display-inline-fontify (handle mode)
458 ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
459 ;; on for buffers whose name begins with " ". That's why we use
460 ;; save-current-buffer/get-buffer-create rather than
463 (set-buffer (generate-new-buffer "*fontification*"))
466 (buffer-disable-undo)
467 (mm-insert-part handle)
470 (let ((font-lock-verbose nil))
471 ;; I find font-lock a bit too verbose.
472 (font-lock-fontify-buffer))
473 ;; By default, XEmacs font-lock uses non-duplicable text
474 ;; properties. This code forces all the text properties
475 ;; to be copied along with the text.
476 (when (fboundp 'extent-list)
477 (map-extents (lambda (ext ignored)
478 (set-extent-property ext 'duplicable t)
480 nil nil nil nil nil 'text-prop))
481 (setq text (buffer-string)))
482 (kill-buffer (current-buffer))))
483 (mm-insert-inline handle text)))
485 ;; Shouldn't these functions check whether the user even wants to use
486 ;; font-lock? At least under XEmacs, this fontification is pretty
487 ;; much unconditional. Also, it would be nice to change for the size
488 ;; of the fontified region.
490 (defun mm-display-patch-inline (handle)
491 (mm-display-inline-fontify handle 'diff-mode))
493 (defun mm-display-elisp-inline (handle)
494 (mm-display-inline-fontify handle 'emacs-lisp-mode))
496 ;; id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
497 ;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
498 (defvar mm-pkcs7-signed-magic
499 (mm-string-as-unibyte
501 (mapcar 'char-to-string
502 (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
503 ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
504 ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
505 ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02)))))
507 ;; id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
508 ;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
509 (defvar mm-pkcs7-enveloped-magic
510 (mm-string-as-unibyte
512 (mapcar 'char-to-string
513 (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
514 ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
515 ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
516 ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03)))))
518 (defun mm-view-pkcs7-get-type (handle)
519 (mm-with-unibyte-buffer
520 (mm-insert-part handle)
521 (cond ((looking-at mm-pkcs7-enveloped-magic)
523 ((looking-at mm-pkcs7-signed-magic)
526 (error "Could not identify PKCS#7 type")))))
528 (defun mm-view-pkcs7 (handle)
529 (case (mm-view-pkcs7-get-type handle)
530 (enveloped (mm-view-pkcs7-decrypt handle))
531 (signed (mm-view-pkcs7-verify handle))
532 (otherwise (error "Unknown or unimplemented PKCS#7 type"))))
534 (defun mm-view-pkcs7-verify (handle)
535 ;; A bogus implementation of PKCS#7. FIXME::
536 (mm-insert-part handle)
537 (goto-char (point-min))
538 (if (search-forward "Content-Type: " nil t)
539 (delete-region (point-min) (match-beginning 0)))
540 (goto-char (point-max))
541 (if (re-search-backward "--\r?\n?" nil t)
542 (delete-region (match-end 0) (point-max)))
543 (goto-char (point-min))
544 (while (search-forward "\r\n" nil t)
545 (replace-match "\n"))
546 (message "Verify signed PKCS#7 message is unimplemented.")
550 (autoload 'gnus-completing-read-maybe-default "gnus-util" nil nil 'macro)
552 (defun mm-view-pkcs7-decrypt (handle)
553 (insert-buffer-substring (mm-handle-buffer handle))
554 (goto-char (point-min))
555 (insert "MIME-Version: 1.0\n")
556 (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
557 (smime-decrypt-region
558 (point-min) (point-max)
559 (if (= (length smime-keys) 1)
561 (smime-get-key-by-email
562 (gnus-completing-read-maybe-default
563 (concat "Decipher using which key? "
564 (if smime-keys (concat "(default " (caar smime-keys) ") ")
566 smime-keys nil nil nil nil (car-safe (car-safe smime-keys))))))
567 (goto-char (point-min))
568 (while (search-forward "\r\n" nil t)
569 (replace-match "\n"))
570 (goto-char (point-min)))
574 ;;; arch-tag: b60e749a-d05c-47f2-bccd-bdaa59327cb2
575 ;;; mm-view.el ends here