mm-view.el 23.6 KB
Newer Older
1
;;; mm-view.el --- functions for viewing MIME objects
2

3
;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
Glenn Morris's avatar
Glenn Morris committed
4
;;   2007, 2008, 2009, 2010  Free Software Foundation, Inc.
Gerd Moellmann's avatar
Gerd Moellmann committed
5 6 7 8

;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;; This file is part of GNU Emacs.

9
;; GNU Emacs is free software: you can redistribute it and/or modify
Gerd Moellmann's avatar
Gerd Moellmann committed
10
;; it under the terms of the GNU General Public License as published by
11 12
;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
Gerd Moellmann's avatar
Gerd Moellmann committed
13 14 15

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
16
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
Gerd Moellmann's avatar
Gerd Moellmann committed
17 18 19
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
20
;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
Gerd Moellmann's avatar
Gerd Moellmann committed
21 22 23 24

;;; Commentary:

;;; Code:
25 26
(eval-and-compile
  (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
Gerd Moellmann's avatar
Gerd Moellmann committed
27 28 29 30 31
(eval-when-compile (require 'cl))
(require 'mail-parse)
(require 'mailcap)
(require 'mm-bodies)
(require 'mm-decode)
32
(require 'smime)
Gerd Moellmann's avatar
Gerd Moellmann committed
33

34
(autoload 'gnus-completing-read "gnus-util")
35
(autoload 'gnus-window-inside-pixel-edges "gnus-ems")
36 37 38 39 40
(autoload 'gnus-article-prepare-display "gnus-art")
(autoload 'vcard-parse-string "vcard")
(autoload 'vcard-format-string "vcard")
(autoload 'fill-flowed "flow-fill")
(autoload 'html2text "html2text" nil t)
Gerd Moellmann's avatar
Gerd Moellmann committed
41

42 43 44 45 46 47 48 49
(defvar gnus-article-mime-handles)
(defvar gnus-newsgroup-charset)
(defvar smime-keys)
(defvar w3m-cid-retrieve-function-alist)
(defvar w3m-current-buffer)
(defvar w3m-display-inline-images)
(defvar w3m-minor-mode-map)

50 51 52
(defvar mm-text-html-renderer-alist
  '((w3  . mm-inline-text-html-render-with-w3)
    (w3m . mm-inline-text-html-render-with-w3m)
53
    (w3m-standalone . mm-inline-text-html-render-with-w3m-standalone)
54 55 56 57 58 59 60 61 62 63 64
    (links mm-inline-render-with-file
	   mm-links-remove-leading-blank
	   "links" "-dump" file)
    (lynx  mm-inline-render-with-stdin nil
	   "lynx" "-dump" "-force_html" "-stdin" "-nolist")
    (html2text  mm-inline-render-with-function html2text))
  "The attributes of renderer types for text/html.")

(defvar mm-text-html-washer-alist
  '((w3  . gnus-article-wash-html-with-w3)
    (w3m . gnus-article-wash-html-with-w3m)
65
    (w3m-standalone . gnus-article-wash-html-with-w3m-standalone)
66 67 68 69 70 71 72 73
    (links mm-inline-wash-with-file
	   mm-links-remove-leading-blank
	   "links" "-dump" file)
    (lynx  mm-inline-wash-with-stdin nil
	   "lynx" "-dump" "-force_html" "-stdin" "-nolist")
    (html2text  html2text))
  "The attributes of washer types for text/html.")

74
(defcustom mm-fill-flowed t
75
  "If non-nil a format=flowed article will be displayed flowed."
76 77 78 79
  :type 'boolean
  :version "22.1"
  :group 'mime-display)

80 81 82 83 84 85 86
(defcustom mm-inline-large-images-proportion 0.9
  "Maximum proportion of large image resized when
`mm-inline-large-images' is set to resize."
  :type 'float
  :version "24.1"
  :group 'mime-display)

87 88
;;; Internal variables.

Gerd Moellmann's avatar
Gerd Moellmann committed
89 90 91
;;;
;;; Functions for displaying various formats inline
;;;
92

Gerd Moellmann's avatar
Gerd Moellmann committed
93 94
(defun mm-inline-image-emacs (handle)
  (let ((b (point-marker))
Stefan Monnier's avatar
Stefan Monnier committed
95
	(inhibit-read-only t))
96 97 98 99 100 101 102 103 104 105 106 107
    (put-image
     (let ((image (mm-get-image handle)))
       (if (eq mm-inline-large-images 'resize)
           (gnus-rescale-image image
                               (let ((edges (gnus-window-inside-pixel-edges
                                             (get-buffer-window (current-buffer)))))
                                 (cons (truncate (* mm-inline-large-images-proportion
                                                    (- (nth 2 edges) (nth 0 edges))))
                                       (truncate (* mm-inline-large-images-proportion
                                                    (- (nth 3 edges) (nth 1 edges)))))))
         image))
     b)
108
    (insert "\n\n")
Gerd Moellmann's avatar
Gerd Moellmann committed
109 110
    (mm-handle-set-undisplayer
     handle
111 112
     `(lambda ()
	(let ((b ,b)
Stefan Monnier's avatar
Stefan Monnier committed
113
	      (inhibit-read-only t))
114 115
	  (remove-images b b)
	  (delete-region b (+ b 2)))))))
Gerd Moellmann's avatar
Gerd Moellmann committed
116 117

(defun mm-inline-image-xemacs (handle)
Dan Nicolaescu's avatar
Dan Nicolaescu committed
118 119 120 121
  (when (featurep 'xemacs)
    (insert "\n\n")
    (forward-char -2)
    (let ((annot (make-annotation (mm-get-image handle) nil 'text))
Stefan Monnier's avatar
Stefan Monnier committed
122
	(inhibit-read-only t))
Dan Nicolaescu's avatar
Dan Nicolaescu committed
123 124 125 126
      (mm-handle-set-undisplayer
       handle
       `(lambda ()
	  (let ((b ,(point-marker))
Stefan Monnier's avatar
Stefan Monnier committed
127
	      (inhibit-read-only t))
Dan Nicolaescu's avatar
Dan Nicolaescu committed
128 129 130 131
	    (delete-annotation ,annot)
	    (delete-region (- b 2) b))))
      (set-extent-property annot 'mm t)
      (set-extent-property annot 'duplicable t))))
Gerd Moellmann's avatar
Gerd Moellmann committed
132 133

(eval-and-compile
Dave Love's avatar
Dave Love committed
134
  (if (featurep 'xemacs)
Gerd Moellmann's avatar
Gerd Moellmann committed
135 136 137
      (defalias 'mm-inline-image 'mm-inline-image-xemacs)
    (defalias 'mm-inline-image 'mm-inline-image-emacs)))

138 139 140 141 142
;; External.
(declare-function w3-do-setup       "ext:w3"         ())
(declare-function w3-region         "ext:w3-display" (st nd))
(declare-function w3-prepare-buffer "ext:w3-display" (&rest args))

Gerd Moellmann's avatar
Gerd Moellmann committed
143 144 145 146 147 148 149 150 151 152
(defvar mm-w3-setup nil)
(defun mm-setup-w3 ()
  (unless mm-w3-setup
    (require 'w3)
    (w3-do-setup)
    (require 'url)
    (require 'w3-vars)
    (require 'url-vars)
    (setq mm-w3-setup t)))

153 154 155 156 157 158 159 160 161 162 163 164 165
(defun mm-inline-text-html-render-with-w3 (handle)
  (mm-setup-w3)
  (let ((text (mm-get-part handle))
	(b (point))
	(url-standalone-mode t)
	(url-gateway-unplugged t)
	(w3-honor-stylesheets nil)
	(url-current-object
	 (url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
	(width (window-width))
	(charset (mail-content-type-get
		  (mm-handle-type handle) 'charset)))
    (save-excursion
166
      (insert (if charset (mm-decode-string text charset) text))
167 168
      (save-restriction
	(narrow-to-region b (point))
169 170 171 172 173 174 175 176
	(unless charset
	  (goto-char (point-min))
	  (when (or (and (boundp 'w3-meta-content-type-charset-regexp)
			 (re-search-forward
			  w3-meta-content-type-charset-regexp nil t))
		    (and (boundp 'w3-meta-charset-content-type-regexp)
			 (re-search-forward
			  w3-meta-charset-content-type-regexp nil t)))
177
	    (setq charset
178 179 180 181 182 183 184 185
		  (let ((bsubstr (buffer-substring-no-properties
				  (match-beginning 2)
				  (match-end 2))))
		    (if (fboundp 'w3-coding-system-for-mime-charset)
			(w3-coding-system-for-mime-charset bsubstr)
		      (mm-charset-to-coding-system bsubstr))))
	    (delete-region (point-min) (point-max))
	    (insert (mm-decode-string text charset))))
186
	(save-window-excursion
Gerd Moellmann's avatar
Gerd Moellmann committed
187
	  (save-restriction
188 189 190 191 192 193 194 195 196 197 198 199 200 201 202 203 204 205 206 207 208 209 210 211 212 213
	    (let ((w3-strict-width width)
		  ;; Don't let w3 set the global version of
		  ;; this variable.
		  (fill-column fill-column))
	      (if (or debug-on-error debug-on-quit)
		  (w3-region (point-min) (point-max))
		(condition-case ()
		    (w3-region (point-min) (point-max))
		  (error
		   (delete-region (point-min) (point-max))
		   (let ((b (point))
			 (charset (mail-content-type-get
				   (mm-handle-type handle) 'charset)))
		     (if (or (eq charset 'gnus-decoded)
			     (eq mail-parse-charset 'gnus-decoded))
		       (save-restriction
			 (narrow-to-region (point) (point))
			 (mm-insert-part handle)
			 (goto-char (point-max)))
		       (insert (mm-decode-string (mm-get-part handle)
						 charset))))
		   (message
		    "Error while rendering html; showing as text/plain")))))))
	(mm-handle-set-undisplayer
	 handle
	 `(lambda ()
Stefan Monnier's avatar
Stefan Monnier committed
214
	    (let ((inhibit-read-only t))
215
	      ,@(if (functionp 'remove-specifier)
Stefan Monnier's avatar
Stefan Monnier committed
216 217 218 219
                    '((dolist (prop '(background background-pixmap foreground))
                        (remove-specifier
                         (face-property 'default prop)
                         (current-buffer)))))
220 221 222 223 224 225
	      (delete-region ,(point-min-marker)
			     ,(point-max-marker)))))))))

(defvar mm-w3m-setup nil
  "Whether gnus-article-mode has been setup to use emacs-w3m.")

226 227 228 229
;; External.
(declare-function w3m-detect-meta-charset "ext:w3m" ())
(declare-function w3m-region "ext:w3m" (start end &optional url charset))

230 231 232 233 234 235 236 237 238 239 240
(defun mm-setup-w3m ()
  "Setup gnus-article-mode to use emacs-w3m."
  (unless mm-w3m-setup
    (require 'w3m)
    (unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
      (push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
	    w3m-cid-retrieve-function-alist))
    (setq mm-w3m-setup t))
  (setq w3m-display-inline-images mm-inline-text-html-with-images))

(defun mm-w3m-cid-retrieve-1 (url handle)
241
  (dolist (elem handle)
242 243 244 245 246 247 248
    (when (consp elem)
      (when (equal url (mm-handle-id elem))
	(mm-insert-part elem)
	(throw 'found-handle (mm-handle-media-type elem)))
      (when (and (stringp (car elem))
		 (equal "multipart" (mm-handle-media-supertype elem)))
	(mm-w3m-cid-retrieve-1 url elem)))))
249 250 251 252

(defun mm-w3m-cid-retrieve (url &rest args)
  "Insert a content pointed by URL if it has the cid: scheme."
  (when (string-match "\\`cid:" url)
253 254 255 256 257 258 259 260
    (or (catch 'found-handle
	  (mm-w3m-cid-retrieve-1
	   (setq url (concat "<" (substring url (match-end 0)) ">"))
	   (with-current-buffer w3m-current-buffer
	     gnus-article-mime-handles)))
	(prog1
	    nil
	  (message "Failed to find \"Content-ID: %s\"" url)))))
261 262 263 264 265 266

(defun mm-inline-text-html-render-with-w3m (handle)
  "Render a text/html part using emacs-w3m."
  (mm-setup-w3m)
  (let ((text (mm-get-part handle))
	(b (point))
Miles Bader's avatar
Miles Bader committed
267 268
	(charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
		     mail-parse-charset)))
269 270 271 272 273 274 275
    (save-excursion
      (insert (if charset (mm-decode-string text charset) text))
      (save-restriction
	(narrow-to-region b (point))
	(unless charset
	  (goto-char (point-min))
	  (when (setq charset (w3m-detect-meta-charset))
Gerd Moellmann's avatar
Gerd Moellmann committed
276
	    (delete-region (point-min) (point-max))
277 278 279 280
	    (insert (mm-decode-string text charset))))
	(let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
	      w3m-force-redisplay)
	  (w3m-region (point-min) (point-max) nil charset))
281 282 283
	;; Put the mark meaning this part was rendered by emacs-w3m.
	(put-text-property (point-min) (point-max)
			   'mm-inline-text-html-with-w3m t)
284 285 286
	(when (and mm-inline-text-html-with-w3m-keymap
		   (boundp 'w3m-minor-mode-map)
		   w3m-minor-mode-map)
287 288
	  (if (and (boundp 'w3m-link-map)
		   w3m-link-map)
289 290 291 292 293
	      (let* ((start (point-min))
		     (end (point-max))
		     (on (get-text-property start 'w3m-href-anchor))
		     (map (copy-keymap w3m-link-map))
		     next)
294
		(set-keymap-parent map w3m-minor-mode-map)
295 296 297 298 299 300 301 302 303 304 305 306 307 308 309
		(while (< start end)
		  (if on
		      (progn
			(setq next (or (text-property-any start end
							  'w3m-href-anchor nil)
				       end))
			(put-text-property start next 'keymap map))
		    (setq next (or (text-property-not-all start end
							  'w3m-href-anchor nil)
				   end))
		    (put-text-property start next 'keymap w3m-minor-mode-map))
		  (setq start next
			on (not on))))
	    (put-text-property (point-min) (point-max)
			       'keymap w3m-minor-mode-map)))
310 311 312
	(mm-handle-set-undisplayer
	 handle
	 `(lambda ()
313
	    (let ((inhibit-read-only t))
314 315
	      (delete-region ,(point-min-marker)
			     ,(point-max-marker)))))))))
316

317 318 319 320 321 322 323 324 325 326 327 328
(defvar mm-w3m-standalone-supports-m17n-p (if (featurep 'mule) 'undecided)
  "*T means the w3m command supports the m17n feature.")

(defun mm-w3m-standalone-supports-m17n-p ()
  "Say whether the w3m command supports the m17n feature."
  (cond ((eq mm-w3m-standalone-supports-m17n-p t) t)
	((eq mm-w3m-standalone-supports-m17n-p nil) nil)
	((not (featurep 'mule)) (setq mm-w3m-standalone-supports-m17n-p nil))
	((condition-case nil
	     (let ((coding-system-for-write 'iso-2022-jp)
		   (coding-system-for-read 'iso-2022-jp)
		   (str (mm-decode-coding-string "\
Miles Bader's avatar
Miles Bader committed
329
\e$B#D#o#e#s!!#w#3#m!!#s#u#p#p#o#r#t!!#m#1#7#n!)\e(B" 'iso-2022-jp)))
330 331 332 333 334 335 336 337 338 339 340 341 342
	       (mm-with-multibyte-buffer
		 (insert str)
		 (call-process-region
		  (point-min) (point-max) "w3m" t t nil "-dump"
		  "-T" "text/html" "-I" "iso-2022-jp" "-O" "iso-2022-jp")
		 (goto-char (point-min))
		 (search-forward str nil t)))
	   (error nil))
	 (setq mm-w3m-standalone-supports-m17n-p t))
	(t
	 ;;(message "You had better upgrade your w3m command")
	 (setq mm-w3m-standalone-supports-m17n-p nil))))

343 344
(defun mm-inline-text-html-render-with-w3m-standalone (handle)
  "Render a text/html part using w3m."
345 346
  (if (mm-w3m-standalone-supports-m17n-p)
      (let ((source (mm-get-part handle))
Miles Bader's avatar
Miles Bader committed
347 348 349
	    (charset (or (mail-content-type-get (mm-handle-type handle)
						'charset)
			 (symbol-name mail-parse-charset)))
350 351 352 353 354 355 356 357 358 359 360 361 362 363 364 365 366 367 368 369
	    cs)
	(unless (and charset
		     (setq cs (mm-charset-to-coding-system charset))
		     (not (eq cs 'ascii)))
	  ;; The default.
	  (setq charset "iso-8859-1"
		cs 'iso-8859-1))
	(mm-insert-inline
	 handle
	 (mm-with-unibyte-buffer
	   (insert source)
	   (mm-enable-multibyte)
	   (let ((coding-system-for-write 'binary)
		 (coding-system-for-read cs))
	     (call-process-region
	      (point-min) (point-max)
	      "w3m" t t nil "-dump" "-T" "text/html"
	      "-I" charset "-O" charset))
	   (buffer-string))))
    (mm-inline-render-with-stdin handle nil "w3m" "-dump" "-T" "text/html")))
370

371 372 373 374 375 376 377 378 379 380 381 382 383 384 385 386 387 388 389 390 391 392 393 394 395 396 397 398 399 400 401 402 403 404 405 406 407 408 409 410 411 412 413 414
(defun mm-links-remove-leading-blank ()
  ;; Delete the annoying three spaces preceding each line of links
  ;; output.
  (goto-char (point-min))
  (while (re-search-forward "^   " nil t)
    (delete-region (match-beginning 0) (match-end 0))))

(defun mm-inline-wash-with-file (post-func cmd &rest args)
  (let ((file (mm-make-temp-file
	       (expand-file-name "mm" mm-tmp-directory))))
    (let ((coding-system-for-write 'binary))
      (write-region (point-min) (point-max) file nil 'silent))
    (delete-region (point-min) (point-max))
    (unwind-protect
	(apply 'call-process cmd nil t nil (mapcar 'eval args))
      (delete-file file))
    (and post-func (funcall post-func))))

(defun mm-inline-wash-with-stdin (post-func cmd &rest args)
  (let ((coding-system-for-write 'binary))
    (apply 'call-process-region (point-min) (point-max)
	   cmd t t nil args))
  (and post-func (funcall post-func)))

(defun mm-inline-render-with-file (handle post-func cmd &rest args)
  (let ((source (mm-get-part handle)))
    (mm-insert-inline
     handle
     (mm-with-unibyte-buffer
       (insert source)
       (apply 'mm-inline-wash-with-file post-func cmd args)
       (buffer-string)))))

(defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
  (let ((source (mm-get-part handle)))
    (mm-insert-inline
     handle
     (mm-with-unibyte-buffer
       (insert source)
       (apply 'mm-inline-wash-with-stdin post-func cmd args)
       (buffer-string)))))

(defun mm-inline-render-with-function (handle func &rest args)
  (let ((source (mm-get-part handle))
Miles Bader's avatar
Miles Bader committed
415 416
	(charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
		     mail-parse-charset)))
417 418 419 420 421 422 423 424 425 426 427 428
    (mm-insert-inline
     handle
     (mm-with-multibyte-buffer
       (insert (if charset
		   (mm-decode-string source charset)
		 source))
       (apply func args)
       (buffer-string)))))

(defun mm-inline-text-html (handle)
  (let* ((func (or mm-inline-text-html-renderer mm-text-html-renderer))
	 (entry (assq func mm-text-html-renderer-alist))
Stefan Monnier's avatar
Stefan Monnier committed
429
	 (inhibit-read-only t))
430 431 432 433 434
    (if entry
	(setq func (cdr entry)))
    (cond
     ((functionp func)
      (funcall func handle))
Gerd Moellmann's avatar
Gerd Moellmann committed
435
     (t
436 437 438
      (apply (car func) handle (cdr func))))))

(defun mm-inline-text-vcard (handle)
Stefan Monnier's avatar
Stefan Monnier committed
439
  (let ((inhibit-read-only t))
440 441 442 443 444 445 446 447 448 449 450 451 452 453 454
    (mm-insert-inline
     handle
     (concat "\n-- \n"
	     (ignore-errors
	       (if (fboundp 'vcard-pretty-print)
		   (vcard-pretty-print (mm-get-part handle))
		 (vcard-format-string
		  (vcard-parse-string (mm-get-part handle)
				      'vcard-standard-filter))))))))

(defun mm-inline-text (handle)
  (let ((b (point))
	(type (mm-handle-media-subtype handle))
	(charset (mail-content-type-get
		  (mm-handle-type handle) 'charset))
Stefan Monnier's avatar
Stefan Monnier committed
455
	(inhibit-read-only t))
456 457 458 459
    (if (or (eq charset 'gnus-decoded)
	    ;; This is probably not entirely correct, but
	    ;; makes rfc822 parts with embedded multiparts work.
	    (eq mail-parse-charset 'gnus-decoded))
Gerd Moellmann's avatar
Gerd Moellmann committed
460
	(save-restriction
461 462 463 464
	  (narrow-to-region (point) (point))
	  (mm-insert-part handle)
	  (goto-char (point-max)))
      (insert (mm-decode-string (mm-get-part handle) charset)))
465 466
    (when (and mm-fill-flowed
	       (equal type "plain")
467 468 469 470 471
	       (equal (cdr (assoc 'format (mm-handle-type handle)))
		      "flowed"))
      (save-restriction
	(narrow-to-region b (point))
	(goto-char b)
472 473
	(fill-flowed nil (equal (cdr (assoc 'delsp (mm-handle-type handle)))
				"yes"))
474 475 476
	(goto-char (point-max))))
    (save-restriction
      (narrow-to-region b (point))
Stefan Monnier's avatar
Stefan Monnier committed
477 478
      (when (member type '("enriched" "richtext"))
        (set-text-properties (point-min) (point-max) nil)
479 480 481 482 483
	(ignore-errors
	  (enriched-decode (point-min) (point-max))))
      (mm-handle-set-undisplayer
       handle
       `(lambda ()
Stefan Monnier's avatar
Stefan Monnier committed
484
          (let ((inhibit-read-only t))
485 486
	    (delete-region ,(point-min-marker)
			   ,(point-max-marker))))))))
Gerd Moellmann's avatar
Gerd Moellmann committed
487 488 489

(defun mm-insert-inline (handle text)
  "Insert TEXT inline from HANDLE."
490
  (let ((b (point)))
Gerd Moellmann's avatar
Gerd Moellmann committed
491
    (insert text)
492 493
    (unless (bolp)
      (insert "\n"))
Gerd Moellmann's avatar
Gerd Moellmann committed
494 495 496
    (mm-handle-set-undisplayer
     handle
     `(lambda ()
Stefan Monnier's avatar
Stefan Monnier committed
497 498 499
	(let ((inhibit-read-only t))
	  (delete-region ,(copy-marker b)
			 ,(copy-marker (point))))))))
Gerd Moellmann's avatar
Gerd Moellmann committed
500 501 502 503 504 505 506 507 508

(defun mm-inline-audio (handle)
  (message "Not implemented"))

(defun mm-view-sound-file ()
  (message "Not implemented"))

(defun mm-w3-prepare-buffer ()
  (require 'w3)
509
  (let ((url-standalone-mode t)
510 511
	(url-gateway-unplugged t)
	(w3-honor-stylesheets nil))
Gerd Moellmann's avatar
Gerd Moellmann committed
512 513 514 515 516 517 518 519 520 521 522 523
    (w3-prepare-buffer)))

(defun mm-view-message ()
  (mm-enable-multibyte)
  (let (handles)
    (let (gnus-article-mime-handles)
      ;; Double decode problem may happen.  See mm-inline-message.
      (run-hooks 'gnus-article-decode-hook)
      (gnus-article-prepare-display)
      (setq handles gnus-article-mime-handles))
    (when handles
      (setq gnus-article-mime-handles
524
	    (mm-merge-handles gnus-article-mime-handles handles))))
Gerd Moellmann's avatar
Gerd Moellmann committed
525 526 527 528 529
  (fundamental-mode)
  (goto-char (point-min)))

(defun mm-inline-message (handle)
  (let ((b (point))
530
	(bolp (bolp))
Gerd Moellmann's avatar
Gerd Moellmann committed
531 532 533 534 535 536 537 538 539 540 541 542 543
	(charset (mail-content-type-get
		  (mm-handle-type handle) 'charset))
	gnus-displaying-mime handles)
    (when (and charset
	       (stringp charset))
      (setq charset (intern (downcase charset)))
      (when (eq charset 'us-ascii)
	(setq charset nil)))
    (save-excursion
      (save-restriction
	(narrow-to-region b b)
	(mm-insert-part handle)
	(let (gnus-article-mime-handles
544 545
	      ;; disable prepare hook
	      gnus-article-prepare-hook
Gerd Moellmann's avatar
Gerd Moellmann committed
546
	      (gnus-newsgroup-charset
547 548
	       (unless (eq charset 'gnus-decoded) ;; mm-uu might set it.
		 (or charset gnus-newsgroup-charset))))
549 550
	  (let ((gnus-original-article-buffer (mm-handle-buffer handle)))
	    (run-hooks 'gnus-article-decode-hook))
Gerd Moellmann's avatar
Gerd Moellmann committed
551 552
	  (gnus-article-prepare-display)
	  (setq handles gnus-article-mime-handles))
553 554 555
	(goto-char (point-min))
	(unless bolp
	  (insert "\n"))
Gerd Moellmann's avatar
Gerd Moellmann committed
556 557 558 559 560 561
	(goto-char (point-max))
	(unless (bolp)
	  (insert "\n"))
	(insert "----------\n\n")
	(when handles
	  (setq gnus-article-mime-handles
562
		(mm-merge-handles gnus-article-mime-handles handles)))
Gerd Moellmann's avatar
Gerd Moellmann committed
563 564 565
	(mm-handle-set-undisplayer
	 handle
	 `(lambda ()
Stefan Monnier's avatar
Stefan Monnier committed
566
	    (let ((inhibit-read-only t))
Dave Love's avatar
Dave Love committed
567
	      (if (fboundp 'remove-specifier)
Gerd Moellmann's avatar
Gerd Moellmann committed
568
		  ;; This is only valid on XEmacs.
Stefan Monnier's avatar
Stefan Monnier committed
569 570 571
		  (dolist (prop '(background background-pixmap foreground))
		    (remove-specifier
		     (face-property 'default prop) (current-buffer))))
Gerd Moellmann's avatar
Gerd Moellmann committed
572 573
	      (delete-region ,(point-min-marker) ,(point-max-marker)))))))))

Dave Love's avatar
Dave Love committed
574
(defun mm-display-inline-fontify (handle mode)
575 576 577 578 579 580 581 582 583 584 585 586
  (let ((charset (mail-content-type-get (mm-handle-type handle) 'charset))
	text coding-system)
    (unless (eq charset 'gnus-decoded)
      (mm-with-unibyte-buffer
	(mm-insert-part handle)
	(mm-decompress-buffer
	 (or (mail-content-type-get (mm-handle-disposition handle) 'name)
	     (mail-content-type-get (mm-handle-disposition handle) 'filename))
	 t t)
	(unless charset
	  (setq coding-system (mm-find-buffer-file-coding-system)))
	(setq text (buffer-string))))
587 588
    ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
    ;; on for buffers whose name begins with " ".  That's why we use
589 590 591 592 593 594 595 596 597 598 599 600 601 602 603 604 605 606 607 608 609 610 611 612 613 614 615 616
    ;; `with-current-buffer'/`generate-new-buffer' rather than
    ;; `with-temp-buffer'.
    (with-current-buffer (generate-new-buffer "*fontification*")
      (buffer-disable-undo)
      (mm-enable-multibyte)
      (insert (cond ((eq charset 'gnus-decoded)
		     (with-current-buffer (mm-handle-buffer handle)
		       (buffer-string)))
		    (coding-system
		     (mm-decode-coding-string text coding-system))
		    (charset
		     (mm-decode-string text charset))
		    (t
		     text)))
      (require 'font-lock)
      (let ((font-lock-maximum-size nil)
	    ;; Disable support modes, e.g., jit-lock, lazy-lock, etc.
	    (font-lock-mode-hook nil)
	    (font-lock-support-mode nil)
	    ;; I find font-lock a bit too verbose.
	    (font-lock-verbose nil))
	(funcall mode)
	;; The mode function might have already turned on font-lock.
	(unless (symbol-value 'font-lock-mode)
	  (font-lock-fontify-buffer)))
      ;; By default, XEmacs font-lock uses non-duplicable text
      ;; properties.  This code forces all the text properties
      ;; to be copied along with the text.
Dan Nicolaescu's avatar
Dan Nicolaescu committed
617
      (when (featurep 'xemacs)
618 619 620 621 622 623
	(map-extents (lambda (ext ignored)
		       (set-extent-property ext 'duplicable t)
		       nil)
		     nil nil nil nil nil 'text-prop))
      (setq text (buffer-string))
      (kill-buffer (current-buffer)))
Gerd Moellmann's avatar
Gerd Moellmann committed
624 625
    (mm-insert-inline handle text)))

626 627 628 629 630
;; Shouldn't these functions check whether the user even wants to use
;; font-lock?  At least under XEmacs, this fontification is pretty
;; much unconditional.  Also, it would be nice to change for the size
;; of the fontified region.

Dave Love's avatar
Dave Love committed
631 632 633 634 635 636
(defun mm-display-patch-inline (handle)
  (mm-display-inline-fontify handle 'diff-mode))

(defun mm-display-elisp-inline (handle)
  (mm-display-inline-fontify handle 'emacs-lisp-mode))

637 638 639
(defun mm-display-dns-inline (handle)
  (mm-display-inline-fontify handle 'dns-mode))

640 641 642
;;      id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
(defvar mm-pkcs7-signed-magic
Miles Bader's avatar
Miles Bader committed
643 644
  "\x30\x5c\x28\x80\x5c\x7c\x81\x2e\x5c\x7c\x82\x2e\x2e\x5c\x7c\x83\x2e\x2e\
\x2e\x5c\x29\x06\x09\x5c\x2a\x86\x48\x86\xf7\x0d\x01\x07\x02")
645 646 647 648

;;      id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
(defvar mm-pkcs7-enveloped-magic
Miles Bader's avatar
Miles Bader committed
649 650
  "\x30\x5c\x28\x80\x5c\x7c\x81\x2e\x5c\x7c\x82\x2e\x2e\x5c\x7c\x83\x2e\x2e\
\x2e\x5c\x29\x06\x09\x5c\x2a\x86\x48\x86\xf7\x0d\x01\x07\x03")
651 652 653 654 655 656 657 658 659 660 661 662 663 664 665 666 667 668

(defun mm-view-pkcs7-get-type (handle)
  (mm-with-unibyte-buffer
    (mm-insert-part handle)
    (cond ((looking-at mm-pkcs7-enveloped-magic)
	   'enveloped)
	  ((looking-at mm-pkcs7-signed-magic)
	   'signed)
	  (t
	   (error "Could not identify PKCS#7 type")))))

(defun mm-view-pkcs7 (handle)
  (case (mm-view-pkcs7-get-type handle)
    (enveloped (mm-view-pkcs7-decrypt handle))
    (signed (mm-view-pkcs7-verify handle))
    (otherwise (error "Unknown or unimplemented PKCS#7 type"))))

(defun mm-view-pkcs7-verify (handle)
669 670 671 672 673 674 675 676 677 678 679 680 681 682 683
  (let ((verified nil))
    (with-temp-buffer
      (insert "MIME-Version: 1.0\n")
      (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
      (insert-buffer-substring (mm-handle-buffer handle))
      (setq verified (smime-verify-region (point-min) (point-max))))
    (goto-char (point-min))
    (mm-insert-part handle)
    (if (search-forward "Content-Type: " nil t)
	(delete-region (point-min) (match-beginning 0)))
    (goto-char (point-max))
    (if (re-search-backward "--\r?\n?" nil t)
	(delete-region (match-end 0) (point-max)))
    (unless verified
      (insert-buffer-substring smime-details-buffer)))
684 685 686 687 688 689 690 691 692 693 694 695 696 697 698
  (goto-char (point-min))
  (while (search-forward "\r\n" nil t)
    (replace-match "\n"))
  t)

(defun mm-view-pkcs7-decrypt (handle)
  (insert-buffer-substring (mm-handle-buffer handle))
  (goto-char (point-min))
  (insert "MIME-Version: 1.0\n")
  (mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
  (smime-decrypt-region
   (point-min) (point-max)
   (if (= (length smime-keys) 1)
       (cadar smime-keys)
     (smime-get-key-by-email
699 700 701
      (gnus-completing-read
       "Decipher using key"
       smime-keys nil nil nil (car-safe (car-safe smime-keys))))))
702 703 704 705 706
  (goto-char (point-min))
  (while (search-forward "\r\n" nil t)
    (replace-match "\n"))
  (goto-char (point-min)))

Gerd Moellmann's avatar
Gerd Moellmann committed
707 708
(provide 'mm-view)

709
;;; mm-view.el ends here