1 ;;; mm-view.el --- functions for viewing MIME objects
3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
4 ;; 2005, 2006 Free Software Foundation, Inc.
6 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
7 ;; This file is part of GNU Emacs.
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)
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.
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.
28 (eval-when-compile (require 'cl))
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"))
41 (defvar gnus-article-mime-handles)
42 (defvar gnus-newsgroup-charset)
44 (defvar w3m-cid-retrieve-function-alist)
45 (defvar w3m-current-buffer)
46 (defvar w3m-display-inline-images)
47 (defvar w3m-minor-mode-map)
49 (defvar mm-text-html-renderer-alist
50 '((w3 . mm-inline-text-html-render-with-w3)
51 (w3m . mm-inline-text-html-render-with-w3m)
52 (w3m-standalone . mm-inline-text-html-render-with-w3m-standalone)
53 (links mm-inline-render-with-file
54 mm-links-remove-leading-blank
56 (lynx mm-inline-render-with-stdin nil
57 "lynx" "-dump" "-force_html" "-stdin" "-nolist")
58 (html2text mm-inline-render-with-function html2text))
59 "The attributes of renderer types for text/html.")
61 (defvar mm-text-html-washer-alist
62 '((w3 . gnus-article-wash-html-with-w3)
63 (w3m . gnus-article-wash-html-with-w3m)
64 (w3m-standalone . gnus-article-wash-html-with-w3m-standalone)
65 (links mm-inline-wash-with-file
66 mm-links-remove-leading-blank
68 (lynx mm-inline-wash-with-stdin nil
69 "lynx" "-dump" "-force_html" "-stdin" "-nolist")
70 (html2text html2text))
71 "The attributes of washer types for text/html.")
73 (defcustom mm-fill-flowed t
74 "If non-nil a format=flowed article will be displayed flowed."
79 ;;; Internal variables.
82 ;;; Functions for displaying various formats inline
85 (defun mm-inline-image-emacs (handle)
86 (let ((b (point-marker))
88 (put-image (mm-get-image handle) b)
90 (mm-handle-set-undisplayer
96 (delete-region b (+ b 2)))))))
98 (defun mm-inline-image-xemacs (handle)
101 (let ((annot (make-annotation (mm-get-image handle) nil 'text))
103 (mm-handle-set-undisplayer
106 (let ((b ,(point-marker))
108 (delete-annotation ,annot)
109 (delete-region (- b 2) b))))
110 (set-extent-property annot 'mm t)
111 (set-extent-property annot 'duplicable t)))
114 (if (featurep 'xemacs)
115 (defalias 'mm-inline-image 'mm-inline-image-xemacs)
116 (defalias 'mm-inline-image 'mm-inline-image-emacs)))
118 (defvar mm-w3-setup nil)
119 (defun mm-setup-w3 ()
126 (setq mm-w3-setup t)))
128 (defun mm-inline-text-html-render-with-w3 (handle)
130 (let ((text (mm-get-part handle))
132 (url-standalone-mode t)
133 (url-gateway-unplugged t)
134 (w3-honor-stylesheets nil)
136 (url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
137 (width (window-width))
138 (charset (mail-content-type-get
139 (mm-handle-type handle) 'charset)))
141 (insert (if charset (mm-decode-string text charset) text))
143 (narrow-to-region b (point))
145 (goto-char (point-min))
146 (when (or (and (boundp 'w3-meta-content-type-charset-regexp)
148 w3-meta-content-type-charset-regexp nil t))
149 (and (boundp 'w3-meta-charset-content-type-regexp)
151 w3-meta-charset-content-type-regexp nil t)))
153 (let ((bsubstr (buffer-substring-no-properties
156 (if (fboundp 'w3-coding-system-for-mime-charset)
157 (w3-coding-system-for-mime-charset bsubstr)
158 (mm-charset-to-coding-system bsubstr))))
159 (delete-region (point-min) (point-max))
160 (insert (mm-decode-string text charset))))
161 (save-window-excursion
163 (let ((w3-strict-width width)
164 ;; Don't let w3 set the global version of
166 (fill-column fill-column))
167 (if (or debug-on-error debug-on-quit)
168 (w3-region (point-min) (point-max))
170 (w3-region (point-min) (point-max))
172 (delete-region (point-min) (point-max))
174 (charset (mail-content-type-get
175 (mm-handle-type handle) 'charset)))
176 (if (or (eq charset 'gnus-decoded)
177 (eq mail-parse-charset 'gnus-decoded))
179 (narrow-to-region (point) (point))
180 (mm-insert-part handle)
181 (goto-char (point-max)))
182 (insert (mm-decode-string (mm-get-part handle)
185 "Error while rendering html; showing as text/plain")))))))
186 (mm-handle-set-undisplayer
189 (let (buffer-read-only)
190 (if (functionp 'remove-specifier)
191 (mapcar (lambda (prop)
193 (face-property 'default prop)
195 '(background background-pixmap foreground)))
196 (delete-region ,(point-min-marker)
197 ,(point-max-marker)))))))))
199 (defvar mm-w3m-setup nil
200 "Whether gnus-article-mode has been setup to use emacs-w3m.")
202 (defun mm-setup-w3m ()
203 "Setup gnus-article-mode to use emacs-w3m."
206 (unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
207 (push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
208 w3m-cid-retrieve-function-alist))
209 (setq mm-w3m-setup t))
210 (setq w3m-display-inline-images mm-inline-text-html-with-images))
212 (defun mm-w3m-cid-retrieve-1 (url handle)
213 (dolist (elem handle)
215 (when (equal url (mm-handle-id elem))
216 (mm-insert-part elem)
217 (throw 'found-handle (mm-handle-media-type elem)))
218 (when (and (stringp (car elem))
219 (equal "multipart" (mm-handle-media-supertype elem)))
220 (mm-w3m-cid-retrieve-1 url elem)))))
222 (defun mm-w3m-cid-retrieve (url &rest args)
223 "Insert a content pointed by URL if it has the cid: scheme."
224 (when (string-match "\\`cid:" url)
225 (or (catch 'found-handle
226 (mm-w3m-cid-retrieve-1
227 (setq url (concat "<" (substring url (match-end 0)) ">"))
228 (with-current-buffer w3m-current-buffer
229 gnus-article-mime-handles)))
232 (message "Failed to find \"Content-ID: %s\"" url)))))
234 (defun mm-inline-text-html-render-with-w3m (handle)
235 "Render a text/html part using emacs-w3m."
237 (let ((text (mm-get-part handle))
239 (charset (mail-content-type-get (mm-handle-type handle) 'charset)))
241 (insert (if charset (mm-decode-string text charset) text))
243 (narrow-to-region b (point))
245 (goto-char (point-min))
246 (when (setq charset (w3m-detect-meta-charset))
247 (delete-region (point-min) (point-max))
248 (insert (mm-decode-string text charset))))
249 (let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
251 (w3m-region (point-min) (point-max) nil charset))
252 (when (and mm-inline-text-html-with-w3m-keymap
253 (boundp 'w3m-minor-mode-map)
256 (point-min) (point-max)
257 (list 'keymap w3m-minor-mode-map
258 ;; Put the mark meaning this part was rendered by emacs-w3m.
259 'mm-inline-text-html-with-w3m t)))
260 (mm-handle-set-undisplayer
263 (let (buffer-read-only)
264 (if (functionp 'remove-specifier)
265 (mapcar (lambda (prop)
267 (face-property 'default prop)
269 '(background background-pixmap foreground)))
270 (delete-region ,(point-min-marker)
271 ,(point-max-marker)))))))))
273 (defvar mm-w3m-standalone-supports-m17n-p (if (featurep 'mule) 'undecided)
274 "*T means the w3m command supports the m17n feature.")
276 (defun mm-w3m-standalone-supports-m17n-p ()
277 "Say whether the w3m command supports the m17n feature."
278 (cond ((eq mm-w3m-standalone-supports-m17n-p t) t)
279 ((eq mm-w3m-standalone-supports-m17n-p nil) nil)
280 ((not (featurep 'mule)) (setq mm-w3m-standalone-supports-m17n-p nil))
282 (let ((coding-system-for-write 'iso-2022-jp)
283 (coding-system-for-read 'iso-2022-jp)
284 (str (mm-decode-coding-string "\
285 \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)))
286 (mm-with-multibyte-buffer
289 (point-min) (point-max) "w3m" t t nil "-dump"
290 "-T" "text/html" "-I" "iso-2022-jp" "-O" "iso-2022-jp")
291 (goto-char (point-min))
292 (search-forward str nil t)))
294 (setq mm-w3m-standalone-supports-m17n-p t))
296 ;;(message "You had better upgrade your w3m command")
297 (setq mm-w3m-standalone-supports-m17n-p nil))))
299 (defun mm-inline-text-html-render-with-w3m-standalone (handle)
300 "Render a text/html part using w3m."
301 (if (mm-w3m-standalone-supports-m17n-p)
302 (let ((source (mm-get-part handle))
303 (charset (mail-content-type-get (mm-handle-type handle) 'charset))
306 (setq cs (mm-charset-to-coding-system charset))
307 (not (eq cs 'ascii)))
309 (setq charset "iso-8859-1"
313 (mm-with-unibyte-buffer
315 (mm-enable-multibyte)
316 (let ((coding-system-for-write 'binary)
317 (coding-system-for-read cs))
319 (point-min) (point-max)
320 "w3m" t t nil "-dump" "-T" "text/html"
321 "-I" charset "-O" charset))
323 (mm-inline-render-with-stdin handle nil "w3m" "-dump" "-T" "text/html")))
325 (defun mm-links-remove-leading-blank ()
326 ;; Delete the annoying three spaces preceding each line of links
328 (goto-char (point-min))
329 (while (re-search-forward "^ " nil t)
330 (delete-region (match-beginning 0) (match-end 0))))
332 (defun mm-inline-wash-with-file (post-func cmd &rest args)
333 (let ((file (mm-make-temp-file
334 (expand-file-name "mm" mm-tmp-directory))))
335 (let ((coding-system-for-write 'binary))
336 (write-region (point-min) (point-max) file nil 'silent))
337 (delete-region (point-min) (point-max))
339 (apply 'call-process cmd nil t nil (mapcar 'eval args))
341 (and post-func (funcall post-func))))
343 (defun mm-inline-wash-with-stdin (post-func cmd &rest args)
344 (let ((coding-system-for-write 'binary))
345 (apply 'call-process-region (point-min) (point-max)
347 (and post-func (funcall post-func)))
349 (defun mm-inline-render-with-file (handle post-func cmd &rest args)
350 (let ((source (mm-get-part handle)))
353 (mm-with-unibyte-buffer
355 (apply 'mm-inline-wash-with-file post-func cmd args)
358 (defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
359 (let ((source (mm-get-part handle)))
362 (mm-with-unibyte-buffer
364 (apply 'mm-inline-wash-with-stdin post-func cmd args)
367 (defun mm-inline-render-with-function (handle func &rest args)
368 (let ((source (mm-get-part handle))
369 (charset (mail-content-type-get (mm-handle-type handle) 'charset)))
372 (mm-with-multibyte-buffer
374 (mm-decode-string source charset)
379 (defun mm-inline-text-html (handle)
380 (let* ((func (or mm-inline-text-html-renderer mm-text-html-renderer))
381 (entry (assq func mm-text-html-renderer-alist))
384 (setq func (cdr entry)))
387 (funcall func handle))
389 (apply (car func) handle (cdr func))))))
391 (defun mm-inline-text-vcard (handle)
392 (let (buffer-read-only)
397 (if (fboundp 'vcard-pretty-print)
398 (vcard-pretty-print (mm-get-part handle))
400 (vcard-parse-string (mm-get-part handle)
401 'vcard-standard-filter))))))))
403 (defun mm-inline-text (handle)
405 (type (mm-handle-media-subtype handle))
406 (charset (mail-content-type-get
407 (mm-handle-type handle) 'charset))
409 (if (or (eq charset 'gnus-decoded)
410 ;; This is probably not entirely correct, but
411 ;; makes rfc822 parts with embedded multiparts work.
412 (eq mail-parse-charset 'gnus-decoded))
414 (narrow-to-region (point) (point))
415 (mm-insert-part handle)
416 (goto-char (point-max)))
417 (insert (mm-decode-string (mm-get-part handle) charset)))
418 (when (and mm-fill-flowed
420 (equal (cdr (assoc 'format (mm-handle-type handle)))
423 (narrow-to-region b (point))
426 (goto-char (point-max))))
428 (narrow-to-region b (point))
429 (when (or (equal type "enriched")
430 (equal type "richtext"))
431 (set-text-properties (point-min) (point-max) nil)
433 (enriched-decode (point-min) (point-max))))
434 (mm-handle-set-undisplayer
437 (let (buffer-read-only)
438 (delete-region ,(point-min-marker)
439 ,(point-max-marker))))))))
441 (defun mm-insert-inline (handle text)
442 "Insert TEXT inline from HANDLE."
447 (mm-handle-set-undisplayer
450 (let (buffer-read-only)
451 (delete-region ,(set-marker (make-marker) b)
452 ,(set-marker (make-marker) (point))))))))
454 (defun mm-inline-audio (handle)
455 (message "Not implemented"))
457 (defun mm-view-sound-file ()
458 (message "Not implemented"))
460 (defun mm-w3-prepare-buffer ()
462 (let ((url-standalone-mode t)
463 (url-gateway-unplugged t)
464 (w3-honor-stylesheets nil))
465 (w3-prepare-buffer)))
467 (defun mm-view-message ()
468 (mm-enable-multibyte)
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))
476 (setq gnus-article-mime-handles
477 (mm-merge-handles gnus-article-mime-handles handles))))
479 (goto-char (point-min)))
481 (defun mm-inline-message (handle)
484 (charset (mail-content-type-get
485 (mm-handle-type handle) 'charset))
486 gnus-displaying-mime handles)
489 (setq charset (intern (downcase charset)))
490 (when (eq charset 'us-ascii)
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))
509 (goto-char (point-max))
512 (insert "----------\n\n")
514 (setq gnus-article-mime-handles
515 (mm-merge-handles gnus-article-mime-handles handles)))
516 (mm-handle-set-undisplayer
519 (let (buffer-read-only)
520 (if (fboundp 'remove-specifier)
521 ;; This is only valid on XEmacs.
522 (mapcar (lambda (prop)
524 (face-property 'default prop) (current-buffer)))
525 '(background background-pixmap foreground)))
526 (delete-region ,(point-min-marker) ,(point-max-marker)))))))))
528 (defun mm-display-inline-fontify (handle mode)
529 (let ((charset (mail-content-type-get (mm-handle-type handle) 'charset))
531 (unless (eq charset 'gnus-decoded)
532 (mm-with-unibyte-buffer
533 (mm-insert-part handle)
534 (mm-decompress-buffer
535 (or (mail-content-type-get (mm-handle-disposition handle) 'name)
536 (mail-content-type-get (mm-handle-disposition handle) 'filename))
539 (setq coding-system (mm-find-buffer-file-coding-system)))
540 (setq text (buffer-string))))
541 ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
542 ;; on for buffers whose name begins with " ". That's why we use
543 ;; `with-current-buffer'/`generate-new-buffer' rather than
544 ;; `with-temp-buffer'.
545 (with-current-buffer (generate-new-buffer "*fontification*")
546 (buffer-disable-undo)
547 (mm-enable-multibyte)
548 (insert (cond ((eq charset 'gnus-decoded)
549 (with-current-buffer (mm-handle-buffer handle)
552 (mm-decode-coding-string text coding-system))
554 (mm-decode-string text charset))
558 (let ((font-lock-maximum-size nil)
559 ;; Disable support modes, e.g., jit-lock, lazy-lock, etc.
560 (font-lock-mode-hook nil)
561 (font-lock-support-mode nil)
562 ;; I find font-lock a bit too verbose.
563 (font-lock-verbose nil))
565 ;; The mode function might have already turned on font-lock.
566 (unless (symbol-value 'font-lock-mode)
567 (font-lock-fontify-buffer)))
568 ;; By default, XEmacs font-lock uses non-duplicable text
569 ;; properties. This code forces all the text properties
570 ;; to be copied along with the text.
571 (when (fboundp 'extent-list)
572 (map-extents (lambda (ext ignored)
573 (set-extent-property ext 'duplicable t)
575 nil nil nil nil nil 'text-prop))
576 (setq text (buffer-string))
577 (kill-buffer (current-buffer)))
578 (mm-insert-inline handle text)))
580 ;; Shouldn't these functions check whether the user even wants to use
581 ;; font-lock? At least under XEmacs, this fontification is pretty
582 ;; much unconditional. Also, it would be nice to change for the size
583 ;; of the fontified region.
585 (defun mm-display-patch-inline (handle)
586 (mm-display-inline-fontify handle 'diff-mode))
588 (defun mm-display-elisp-inline (handle)
589 (mm-display-inline-fontify handle 'emacs-lisp-mode))
591 (defun mm-display-dns-inline (handle)
592 (mm-display-inline-fontify handle 'dns-mode))
594 ;; id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
595 ;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
596 (defvar mm-pkcs7-signed-magic
597 (mm-string-as-unibyte
598 (mapconcat 'char-to-string
599 (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
600 ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
601 ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
602 ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02) "")))
604 ;; id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
605 ;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
606 (defvar mm-pkcs7-enveloped-magic
607 (mm-string-as-unibyte
608 (mapconcat 'char-to-string
609 (list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
610 ?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
611 ?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
612 ?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03) "")))
614 (defun mm-view-pkcs7-get-type (handle)
615 (mm-with-unibyte-buffer
616 (mm-insert-part handle)
617 (cond ((looking-at mm-pkcs7-enveloped-magic)
619 ((looking-at mm-pkcs7-signed-magic)
622 (error "Could not identify PKCS#7 type")))))
624 (defun mm-view-pkcs7 (handle)
625 (case (mm-view-pkcs7-get-type handle)
626 (enveloped (mm-view-pkcs7-decrypt handle))
627 (signed (mm-view-pkcs7-verify handle))
628 (otherwise (error "Unknown or unimplemented PKCS#7 type"))))
630 (defun mm-view-pkcs7-verify (handle)
631 (let ((verified nil))
633 (insert "MIME-Version: 1.0\n")
634 (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
635 (insert-buffer-substring (mm-handle-buffer handle))
636 (setq verified (smime-verify-region (point-min) (point-max))))
637 (goto-char (point-min))
638 (mm-insert-part handle)
639 (if (search-forward "Content-Type: " nil t)
640 (delete-region (point-min) (match-beginning 0)))
641 (goto-char (point-max))
642 (if (re-search-backward "--\r?\n?" nil t)
643 (delete-region (match-end 0) (point-max)))
645 (insert-buffer-substring smime-details-buffer)))
646 (goto-char (point-min))
647 (while (search-forward "\r\n" nil t)
648 (replace-match "\n"))
651 (defun mm-view-pkcs7-decrypt (handle)
652 (insert-buffer-substring (mm-handle-buffer handle))
653 (goto-char (point-min))
654 (insert "MIME-Version: 1.0\n")
655 (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
656 (smime-decrypt-region
657 (point-min) (point-max)
658 (if (= (length smime-keys) 1)
660 (smime-get-key-by-email
662 (concat "Decipher using key"
663 (if smime-keys (concat "(default " (caar smime-keys) "): ")
665 smime-keys nil nil nil nil (car-safe (car-safe smime-keys))))))
666 (goto-char (point-min))
667 (while (search-forward "\r\n" nil t)
668 (replace-match "\n"))
669 (goto-char (point-min)))
673 ;;; arch-tag: b60e749a-d05c-47f2-bccd-bdaa59327cb2
674 ;;; mm-view.el ends here