[bpt/emacs.git] / lisp / gnus / mm-view.el

;;; mm-view.el --- functions for viewing MIME objects
;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
;;        Free Software Foundation, Inc.

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

;; GNU Emacs is free software; you can redistribute it and/or modify
;; it under the terms of the GNU General Public License as published by
;; the Free Software Foundation; either version 2, or (at your option)
;; any later version.

;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.	 See the
;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
;; along with GNU Emacs; see the file COPYING.  If not, write to the
;; Free Software Foundation, Inc., 59 Temple Place - Suite 330,
;; Boston, MA 02111-1307, USA.

;;; Commentary:

;;; Code:

(eval-when-compile (require 'cl))
(require 'mail-parse)
(require 'mailcap)
(require 'mm-bodies)
(require 'mm-decode)

(eval-and-compile
  (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")
  (unless (fboundp 'diff-mode)
    (autoload 'diff-mode "diff-mode" "" t nil)))

(defvar mm-text-html-renderer-alist
  '((w3  . mm-inline-text-html-render-with-w3)
    (w3m . mm-inline-text-html-render-with-w3m)
    (w3m-standalone mm-inline-render-with-stdin nil
		    "w3m" "-dump" "-T" "text/html")
    (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)
    (w3m-standalone mm-inline-wash-with-stdin nil
		    "w3m" "-dump" "-T" "text/html")
    (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.")

;;; Internal variables.

;;;
;;; Functions for displaying various formats inline
;;;

(defun mm-inline-image-emacs (handle)
  (let ((b (point-marker))
	buffer-read-only)
    (put-image (mm-get-image handle) b)
    (insert "\n\n")
    (mm-handle-set-undisplayer
     handle
     `(lambda ()
	(let ((b ,b)
	      buffer-read-only)
	  (remove-images b b)
	  (delete-region b (+ b 2)))))))

(defun mm-inline-image-xemacs (handle)
  (insert "\n\n")
  (forward-char -2)
  (let ((annot (make-annotation (mm-get-image handle) nil 'text))
	buffer-read-only)
    (mm-handle-set-undisplayer
     handle
     `(lambda ()
	(let ((b ,(point-marker))
	      buffer-read-only)
	  (delete-annotation ,annot)
	  (delete-region (- b 2) b))))
    (set-extent-property annot 'mm t)
    (set-extent-property annot 'duplicable t)))

(eval-and-compile
  (if (featurep 'xemacs)
      (defalias 'mm-inline-image 'mm-inline-image-xemacs)
    (defalias 'mm-inline-image 'mm-inline-image-emacs)))

(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)))

(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
      (insert text)
      (save-restriction
	(narrow-to-region b (point))
	(goto-char (point-min))
	(if (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)))
	    (setq charset
		  (or (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)))
		      charset)))
	(delete-region (point-min) (point-max))
	(insert (mm-decode-string text charset))
	(save-window-excursion
	  (save-restriction
	    (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 ()
	    (let (buffer-read-only)
	      (if (functionp 'remove-specifier)
		  (mapcar (lambda (prop)
			    (remove-specifier
			     (face-property 'default prop)
			     (current-buffer)))
			  '(background background-pixmap foreground)))
	      (delete-region ,(point-min-marker)
			     ,(point-max-marker)))))))))

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

(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)
  (dolist (elem handle)
    (when (listp elem)
      (if (equal url (mm-handle-id elem))
	  (progn
	    (mm-insert-part elem)
	    (throw 'found-handle (mm-handle-media-type elem))))
      (if (equal "multipart" (mm-handle-media-supertype elem))
	  (mm-w3m-cid-retrieve-1 url elem)))))

(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)
    (catch 'found-handle
      (mm-w3m-cid-retrieve-1 (concat "<" (substring url (match-end 0)) ">")
			     (with-current-buffer w3m-current-buffer
			       gnus-article-mime-handles)))))

(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))
	(charset (mail-content-type-get (mm-handle-type handle) 'charset)))
    (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))
	    (delete-region (point-min) (point-max))
	    (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))
	(when (and mm-inline-text-html-with-w3m-keymap
		   (boundp 'w3m-minor-mode-map)
		   w3m-minor-mode-map)
	  (add-text-properties
	   (point-min) (point-max)
	   (list 'keymap w3m-minor-mode-map
		 ;; Put the mark meaning this part was rendered by emacs-w3m.
		 'mm-inline-text-html-with-w3m t))))
      (mm-handle-set-undisplayer
       handle
       `(lambda ()
	  (let (buffer-read-only)
	    (if (functionp 'remove-specifier)
		(mapcar (lambda (prop)
			  (remove-specifier
			   (face-property 'default prop)
			   (current-buffer)))
			'(background background-pixmap foreground)))
	    (delete-region ,(point-min-marker)
			   ,(point-max-marker))))))))

(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))
	(charset (mail-content-type-get (mm-handle-type handle) 'charset)))
    (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))
	 buffer-read-only)
    (if entry
	(setq func (cdr entry)))
    (cond
     ((functionp func)
      (funcall func handle))
     (t
      (apply (car func) handle (cdr func))))))

(defun mm-inline-text-vcard (handle)
  (let (buffer-read-only)
    (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))
	buffer-read-only)
    (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))
	(save-restriction
	  (narrow-to-region (point) (point))
	  (mm-insert-part handle)
	  (goto-char (point-max)))
      (insert (mm-decode-string (mm-get-part handle) charset)))
    (when (and (equal type "plain")
	       (equal (cdr (assoc 'format (mm-handle-type handle)))
		      "flowed"))
      (save-restriction
	(narrow-to-region b (point))
	(goto-char b)
	(fill-flowed)
	(goto-char (point-max))))
    (save-restriction
      (narrow-to-region b (point))
      (set-text-properties (point-min) (point-max) nil)
      (when (or (equal type "enriched")
		(equal type "richtext"))
	(ignore-errors
	  (enriched-decode (point-min) (point-max))))
      (mm-handle-set-undisplayer
       handle
       `(lambda ()
	  (let (buffer-read-only)
	    (delete-region ,(point-min-marker)
			   ,(point-max-marker))))))))

(defun mm-insert-inline (handle text)
  "Insert TEXT inline from HANDLE."
  (let ((b (point)))
    (insert text)
    (mm-handle-set-undisplayer
     handle
     `(lambda ()
	(let (buffer-read-only)
	  (delete-region ,(set-marker (make-marker) b)
			 ,(set-marker (make-marker) (point))))))))

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

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

(defun mm-w3-prepare-buffer ()
  (require 'w3)
  (let ((url-standalone-mode t)
	(url-gateway-unplugged t)
	(w3-honor-stylesheets nil))
    (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
	    (mm-merge-handles gnus-article-mime-handles handles))))
  (fundamental-mode)
  (goto-char (point-min)))

(defun mm-inline-message (handle)
  (let ((b (point))
	(bolp (bolp))
	(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
	      ;; disable prepare hook
	      gnus-article-prepare-hook
	      (gnus-newsgroup-charset
	       (or charset gnus-newsgroup-charset)))
	  (let ((gnus-original-article-buffer (mm-handle-buffer handle)))
	    (run-hooks 'gnus-article-decode-hook))
	  (gnus-article-prepare-display)
	  (setq handles gnus-article-mime-handles))
	(goto-char (point-min))
	(unless bolp
	  (insert "\n"))
	(goto-char (point-max))
	(unless (bolp)
	  (insert "\n"))
	(insert "----------\n\n")
	(when handles
	  (setq gnus-article-mime-handles
		(mm-merge-handles gnus-article-mime-handles handles)))
	(mm-handle-set-undisplayer
	 handle
	 `(lambda ()
	    (let (buffer-read-only)
	      (if (fboundp 'remove-specifier)
		  ;; This is only valid on XEmacs.
		  (mapcar (lambda (prop)
			    (remove-specifier
			     (face-property 'default prop) (current-buffer)))
			  '(background background-pixmap foreground)))
	      (delete-region ,(point-min-marker) ,(point-max-marker)))))))))

(defun mm-display-inline-fontify (handle mode)
  (let (text)
    ;; XEmacs @#$@ version of font-lock refuses to fully turn itself
    ;; on for buffers whose name begins with " ".  That's why we use
    ;; save-current-buffer/get-buffer-create rather than
    ;; with-temp-buffer.
    (save-current-buffer
      (set-buffer (generate-new-buffer "*fontification*"))
      (unwind-protect
	  (progn
	    (buffer-disable-undo)
	    (mm-insert-part handle)
	    (funcall mode)
	    (require 'font-lock)
	    (let ((font-lock-verbose nil))
	      ;; I find font-lock a bit too verbose.
	      (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.
	    (when (fboundp 'extent-list)
	      (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))))
    (mm-insert-inline handle text)))

;; 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.

(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))

;;      id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
(defvar mm-pkcs7-signed-magic
  (mm-string-as-unibyte
   (apply 'concat
	  (mapcar 'char-to-string
		  (list ?\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)))))

;;      id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
;;          us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
(defvar mm-pkcs7-enveloped-magic
  (mm-string-as-unibyte
   (apply 'concat
	  (mapcar 'char-to-string
		  (list ?\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)))))

(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)
  ;; A bogus implementation of PKCS#7. FIXME::
  (mm-insert-part handle)
  (goto-char (point-min))
  (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)))
  (goto-char (point-min))
  (while (search-forward "\r\n" nil t)
    (replace-match "\n"))
  (message "Verify signed PKCS#7 message is unimplemented.")
  (sit-for 1)
  t)

(autoload 'gnus-completing-read-maybe-default "gnus-util" nil nil 'macro)

(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
      (gnus-completing-read-maybe-default
       (concat "Decipher using which key? "
	       (if smime-keys (concat "(default " (caar smime-keys) ") ")
		 ""))
       smime-keys nil nil nil nil (car-safe (car-safe smime-keys))))))
  (goto-char (point-min))
  (while (search-forward "\r\n" nil t)
    (replace-match "\n"))
  (goto-char (point-min)))

(provide 'mm-view)

;;; arch-tag: b60e749a-d05c-47f2-bccd-bdaa59327cb2
;;; mm-view.el ends here
Commit	Line	Data
715a2ca2	1	;;; mm-view.el --- functions for viewing MIME objects
23f87bed MB	2	;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004
23f87bed MB	3	;; Free Software Foundation, Inc.
c113de23 GM	4
	5	;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
	6	;; This file is part of GNU Emacs.
	7
	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)
	11	;; any later version.
	12
	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.
	17
	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.
	22
	23	;;; Commentary:
	24
	25	;;; Code:
	26
	27	(eval-when-compile (require 'cl))
	28	(require 'mail-parse)
	29	(require 'mailcap)
	30	(require 'mm-bodies)
	31	(require 'mm-decode)
	32
	33	(eval-and-compile
	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")
23f87bed	38	(autoload 'html2text "html2text")
39e72e55 GM	39	(unless (fboundp 'diff-mode)
39e72e55 GM	40	(autoload 'diff-mode "diff-mode" "" t nil)))
c113de23	41
23f87bed MB	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
	49	"links" "-dump" file)
	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.")
	54
	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
	62	"links" "-dump" file)
	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.")
	67
	68	;;; Internal variables.
	69
c113de23 GM	70	;;;
	71	;;; Functions for displaying various formats inline
	72	;;;
23f87bed	73
c113de23 GM	74	(defun mm-inline-image-emacs (handle)
	75	(let ((b (point-marker))
	76	buffer-read-only)
c113de23	77	(put-image (mm-get-image handle) b)
23f87bed	78	(insert "\n\n")
c113de23 GM	79	(mm-handle-set-undisplayer
c113de23 GM	80	handle
23f87bed MB	81	`(lambda ()
	82	(let ((b ,b)
	83	buffer-read-only)
	84	(remove-images b b)
	85	(delete-region b (+ b 2)))))))
c113de23 GM	86
c113de23 GM	87	(defun mm-inline-image-xemacs (handle)
23f87bed MB	88	(insert "\n\n")
	89	(forward-char -2)
	90	(let ((annot (make-annotation (mm-get-image handle) nil 'text))
c113de23	91	buffer-read-only)
c113de23 GM	92	(mm-handle-set-undisplayer
	93	handle
	94	`(lambda ()
23f87bed MB	95	(let ((b ,(point-marker))
23f87bed MB	96	buffer-read-only)
c113de23	97	(delete-annotation ,annot)
23f87bed	98	(delete-region (- b 2) b))))
c113de23 GM	99	(set-extent-property annot 'mm t)
	100	(set-extent-property annot 'duplicable t)))
	101
	102	(eval-and-compile
722a8409	103	(if (featurep 'xemacs)
c113de23 GM	104	(defalias 'mm-inline-image 'mm-inline-image-xemacs)
	105	(defalias 'mm-inline-image 'mm-inline-image-emacs)))
	106
	107	(defvar mm-w3-setup nil)
	108	(defun mm-setup-w3 ()
	109	(unless mm-w3-setup
	110	(require 'w3)
	111	(w3-do-setup)
	112	(require 'url)
	113	(require 'w3-vars)
	114	(require 'url-vars)
	115	(setq mm-w3-setup t)))
	116
23f87bed MB	117	(defun mm-inline-text-html-render-with-w3 (handle)
	118	(mm-setup-w3)
	119	(let ((text (mm-get-part handle))
	120	(b (point))
	121	(url-standalone-mode t)
	122	(url-gateway-unplugged t)
	123	(w3-honor-stylesheets nil)
	124	(url-current-object
	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)))
	129	(save-excursion
	130	(insert text)
	131	(save-restriction
	132	(narrow-to-region b (point))
	133	(goto-char (point-min))
	134	(if (or (and (boundp 'w3-meta-content-type-charset-regexp)
	135	(re-search-forward
	136	w3-meta-content-type-charset-regexp nil t))
	137	(and (boundp 'w3-meta-charset-content-type-regexp)
	138	(re-search-forward
	139	w3-meta-charset-content-type-regexp nil t)))
	140	(setq charset
	141	(or (let ((bsubstr (buffer-substring-no-properties
	142	(match-beginning 2)
	143	(match-end 2))))
	144	(if (fboundp 'w3-coding-system-for-mime-charset)
	145	(w3-coding-system-for-mime-charset bsubstr)
	146	(mm-charset-to-coding-system bsubstr)))
	147	charset)))
	148	(delete-region (point-min) (point-max))
	149	(insert (mm-decode-string text charset))
	150	(save-window-excursion
c113de23	151	(save-restriction
23f87bed MB	152	(let ((w3-strict-width width)
	153	;; Don't let w3 set the global version of
	154	;; this variable.
	155	(fill-column fill-column))
	156	(if (or debug-on-error debug-on-quit)
	157	(w3-region (point-min) (point-max))
	158	(condition-case ()
	159	(w3-region (point-min) (point-max))
	160	(error
	161	(delete-region (point-min) (point-max))
	162	(let ((b (point))
	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))
	167	(save-restriction
	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)
	172	charset))))
	173	(message
	174	"Error while rendering html; showing as text/plain")))))))
	175	(mm-handle-set-undisplayer
	176	handle
	177	`(lambda ()
	178	(let (buffer-read-only)
	179	(if (functionp 'remove-specifier)
	180	(mapcar (lambda (prop)
	181	(remove-specifier
	182	(face-property 'default prop)
	183	(current-buffer)))
	184	'(background background-pixmap foreground)))
	185	(delete-region ,(point-min-marker)
	186	,(point-max-marker)))))))))
	187
	188	(defvar mm-w3m-setup nil
	189	"Whether gnus-article-mode has been setup to use emacs-w3m.")
	190
	191	(defun mm-setup-w3m ()
	192	"Setup gnus-article-mode to use emacs-w3m."
	193	(unless mm-w3m-setup
	194	(require '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))
	200
	201	(defun mm-w3m-cid-retrieve-1 (url handle)
54506618 MB	202	(dolist (elem handle)
	203	(when (listp elem)
	204	(if (equal url (mm-handle-id elem))
	205	(progn
	206	(mm-insert-part elem)
	207	(throw 'found-handle (mm-handle-media-type elem))))
	208	(if (equal "multipart" (mm-handle-media-supertype elem))
	209	(mm-w3m-cid-retrieve-1 url elem)))))
23f87bed MB	210
	211	(defun mm-w3m-cid-retrieve (url &rest args)
	212	"Insert a content pointed by URL if it has the cid: scheme."
	213	(when (string-match "\\`cid:" url)
	214	(catch 'found-handle
	215	(mm-w3m-cid-retrieve-1 (concat "<" (substring url (match-end 0)) ">")
	216	(with-current-buffer w3m-current-buffer
	217	gnus-article-mime-handles)))))
	218
	219	(defun mm-inline-text-html-render-with-w3m (handle)
	220	"Render a text/html part using emacs-w3m."
	221	(mm-setup-w3m)
	222	(let ((text (mm-get-part handle))
	223	(b (point))
	224	(charset (mail-content-type-get (mm-handle-type handle) 'charset)))
	225	(save-excursion
	226	(insert (if charset (mm-decode-string text charset) text))
	227	(save-restriction
	228	(narrow-to-region b (point))
	229	(unless charset
	230	(goto-char (point-min))
	231	(when (setq charset (w3m-detect-meta-charset))
c113de23	232	(delete-region (point-min) (point-max))
23f87bed MB	233	(insert (mm-decode-string text charset))))
	234	(let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
	235	w3m-force-redisplay)
	236	(w3m-region (point-min) (point-max) nil charset))
	237	(when (and mm-inline-text-html-with-w3m-keymap
	238	(boundp 'w3m-minor-mode-map)
	239	w3m-minor-mode-map)
	240	(add-text-properties
	241	(point-min) (point-max)
	242	(list 'keymap w3m-minor-mode-map
	243	;; Put the mark meaning this part was rendered by emacs-w3m.
	244	'mm-inline-text-html-with-w3m t))))
	245	(mm-handle-set-undisplayer
c113de23	246	handle
23f87bed MB	247	`(lambda ()
	248	(let (buffer-read-only)
	249	(if (functionp 'remove-specifier)
	250	(mapcar (lambda (prop)
	251	(remove-specifier
	252	(face-property 'default prop)
	253	(current-buffer)))
	254	'(background background-pixmap foreground)))
	255	(delete-region ,(point-min-marker)
	256	,(point-max-marker))))))))
	257
	258	(defun mm-links-remove-leading-blank ()
	259	;; Delete the annoying three spaces preceding each line of links
	260	;; output.
	261	(goto-char (point-min))
	262	(while (re-search-forward "^ " nil t)
	263	(delete-region (match-beginning 0) (match-end 0))))
	264
	265	(defun mm-inline-wash-with-file (post-func cmd &rest args)
	266	(let ((file (mm-make-temp-file
	267	(expand-file-name "mm" mm-tmp-directory))))
	268	(let ((coding-system-for-write 'binary))
	269	(write-region (point-min) (point-max) file nil 'silent))
	270	(delete-region (point-min) (point-max))
	271	(unwind-protect
	272	(apply 'call-process cmd nil t nil (mapcar 'eval args))
	273	(delete-file file))
	274	(and post-func (funcall post-func))))
	275
	276	(defun mm-inline-wash-with-stdin (post-func cmd &rest args)
	277	(let ((coding-system-for-write 'binary))
	278	(apply 'call-process-region (point-min) (point-max)
	279	cmd t t nil args))
	280	(and post-func (funcall post-func)))
	281
	282	(defun mm-inline-render-with-file (handle post-func cmd &rest args)
	283	(let ((source (mm-get-part handle)))
	284	(mm-insert-inline
	285	handle
	286	(mm-with-unibyte-buffer
	287	(insert source)
	288	(apply 'mm-inline-wash-with-file post-func cmd args)
	289	(buffer-string)))))
	290
	291	(defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
	292	(let ((source (mm-get-part handle)))
	293	(mm-insert-inline
	294	handle
	295	(mm-with-unibyte-buffer
	296	(insert source)
	297	(apply 'mm-inline-wash-with-stdin post-func cmd args)
	298	(buffer-string)))))
	299
	300	(defun mm-inline-render-with-function (handle func &rest args)
	301	(let ((source (mm-get-part handle))
	302	(charset (mail-content-type-get (mm-handle-type handle) 'charset)))
	303	(mm-insert-inline
	304	handle
	305	(mm-with-multibyte-buffer
	306	(insert (if charset
	307	(mm-decode-string source charset)
	308	source))
	309	(apply func args)
	310	(buffer-string)))))
311
312	(defun mm-inline-text-html (handle)
313	(let* ((func (or mm-inline-text-html-renderer mm-text-html-renderer))
314	(entry (assq func mm-text-html-renderer-alist))
315	buffer-read-only)
316	(if entry
317	(setq func (cdr entry)))
318	(cond
319	((functionp func)
320	(funcall func handle))
c113de23	321	(t
23f87bed MB	322	(apply (car func) handle (cdr func))))))
	323
	324	(defun mm-inline-text-vcard (handle)
	325	(let (buffer-read-only)
	326	(mm-insert-inline
	327	handle
	328	(concat "\n-- \n"
	329	(ignore-errors
	330	(if (fboundp 'vcard-pretty-print)
	331	(vcard-pretty-print (mm-get-part handle))
	332	(vcard-format-string
	333	(vcard-parse-string (mm-get-part handle)
	334	'vcard-standard-filter))))))))
	335
	336	(defun mm-inline-text (handle)
	337	(let ((b (point))
	338	(type (mm-handle-media-subtype handle))
	339	(charset (mail-content-type-get
	340	(mm-handle-type handle) 'charset))
	341	buffer-read-only)
	342	(if (or (eq charset 'gnus-decoded)
	343	;; This is probably not entirely correct, but
	344	;; makes rfc822 parts with embedded multiparts work.
	345	(eq mail-parse-charset 'gnus-decoded))
c113de23	346	(save-restriction
23f87bed MB	347	(narrow-to-region (point) (point))
	348	(mm-insert-part handle)
	349	(goto-char (point-max)))
	350	(insert (mm-decode-string (mm-get-part handle) charset)))
	351	(when (and (equal type "plain")
	352	(equal (cdr (assoc 'format (mm-handle-type handle)))
	353	"flowed"))
	354	(save-restriction
	355	(narrow-to-region b (point))
	356	(goto-char b)
	357	(fill-flowed)
	358	(goto-char (point-max))))
	359	(save-restriction
	360	(narrow-to-region b (point))
	361	(set-text-properties (point-min) (point-max) nil)
	362	(when (or (equal type "enriched")
	363	(equal type "richtext"))
	364	(ignore-errors
	365	(enriched-decode (point-min) (point-max))))
	366	(mm-handle-set-undisplayer
	367	handle
	368	`(lambda ()
	369	(let (buffer-read-only)
	370	(delete-region ,(point-min-marker)
	371	,(point-max-marker))))))))
c113de23 GM	372
	373	(defun mm-insert-inline (handle text)
	374	"Insert TEXT inline from HANDLE."
23f87bed	375	(let ((b (point)))
c113de23 GM	376	(insert text)
	377	(mm-handle-set-undisplayer
	378	handle
	379	`(lambda ()
	380	(let (buffer-read-only)
	381	(delete-region ,(set-marker (make-marker) b)
	382	,(set-marker (make-marker) (point))))))))
	383
	384	(defun mm-inline-audio (handle)
	385	(message "Not implemented"))
	386
	387	(defun mm-view-sound-file ()
	388	(message "Not implemented"))
	389
	390	(defun mm-w3-prepare-buffer ()
	391	(require 'w3)
6833e8ba	392	(let ((url-standalone-mode t)
23f87bed MB	393	(url-gateway-unplugged t)
23f87bed MB	394	(w3-honor-stylesheets nil))
c113de23 GM	395	(w3-prepare-buffer)))
	396
	397	(defun mm-view-message ()
	398	(mm-enable-multibyte)
	399	(let (handles)
	400	(let (gnus-article-mime-handles)
	401	;; Double decode problem may happen. See mm-inline-message.
	402	(run-hooks 'gnus-article-decode-hook)
	403	(gnus-article-prepare-display)
	404	(setq handles gnus-article-mime-handles))
	405	(when handles
	406	(setq gnus-article-mime-handles
23f87bed	407	(mm-merge-handles gnus-article-mime-handles handles))))
c113de23 GM	408	(fundamental-mode)
	409	(goto-char (point-min)))
	410
	411	(defun mm-inline-message (handle)
	412	(let ((b (point))
4e728580	413	(bolp (bolp))
c113de23 GM	414	(charset (mail-content-type-get
	415	(mm-handle-type handle) 'charset))
	416	gnus-displaying-mime handles)
	417	(when (and charset
	418	(stringp charset))
	419	(setq charset (intern (downcase charset)))
	420	(when (eq charset 'us-ascii)
	421	(setq charset nil)))
	422	(save-excursion
	423	(save-restriction
	424	(narrow-to-region b b)
	425	(mm-insert-part handle)
	426	(let (gnus-article-mime-handles
4e728580 SZ	427	;; disable prepare hook
4e728580 SZ	428	gnus-article-prepare-hook
c113de23 GM	429	(gnus-newsgroup-charset
c113de23 GM	430	(or charset gnus-newsgroup-charset)))
23f87bed MB	431	(let ((gnus-original-article-buffer (mm-handle-buffer handle)))
23f87bed MB	432	(run-hooks 'gnus-article-decode-hook))
c113de23 GM	433	(gnus-article-prepare-display)
c113de23 GM	434	(setq handles gnus-article-mime-handles))
4e728580 SZ	435	(goto-char (point-min))
	436	(unless bolp
	437	(insert "\n"))
c113de23 GM	438	(goto-char (point-max))
	439	(unless (bolp)
	440	(insert "\n"))
	441	(insert "----------\n\n")
	442	(when handles
	443	(setq gnus-article-mime-handles
23f87bed	444	(mm-merge-handles gnus-article-mime-handles handles)))
c113de23 GM	445	(mm-handle-set-undisplayer
	446	handle
	447	`(lambda ()
	448	(let (buffer-read-only)
722a8409	449	(if (fboundp 'remove-specifier)
c113de23 GM	450	;; This is only valid on XEmacs.
	451	(mapcar (lambda (prop)
	452	(remove-specifier
	453	(face-property 'default prop) (current-buffer)))
722a8409	454	'(background background-pixmap foreground)))
c113de23 GM	455	(delete-region ,(point-min-marker) ,(point-max-marker)))))))))
c113de23 GM	456
ce9401f3	457	(defun mm-display-inline-fontify (handle mode)
c113de23	458	(let (text)
23f87bed MB	459	;; XEmacs @#$@ version of font-lock refuses to fully turn itself
	460	;; on for buffers whose name begins with " ". That's why we use
	461	;; save-current-buffer/get-buffer-create rather than
	462	;; with-temp-buffer.
	463	(save-current-buffer
	464	(set-buffer (generate-new-buffer "fontification"))
	465	(unwind-protect
	466	(progn
	467	(buffer-disable-undo)
	468	(mm-insert-part handle)
	469	(funcall mode)
	470	(require 'font-lock)
	471	(let ((font-lock-verbose nil))
	472	;; I find font-lock a bit too verbose.
	473	(font-lock-fontify-buffer))
	474	;; By default, XEmacs font-lock uses non-duplicable text
	475	;; properties. This code forces all the text properties
	476	;; to be copied along with the text.
	477	(when (fboundp 'extent-list)
	478	(map-extents (lambda (ext ignored)
	479	(set-extent-property ext 'duplicable t)
	480	nil)
	481	nil nil nil nil nil 'text-prop))
	482	(setq text (buffer-string)))
	483	(kill-buffer (current-buffer))))
c113de23 GM	484	(mm-insert-inline handle text)))
c113de23 GM	485
23f87bed MB	486	;; Shouldn't these functions check whether the user even wants to use
	487	;; font-lock? At least under XEmacs, this fontification is pretty
	488	;; much unconditional. Also, it would be nice to change for the size
	489	;; of the fontified region.
	490
ce9401f3 DL	491	(defun mm-display-patch-inline (handle)
	492	(mm-display-inline-fontify handle 'diff-mode))
	493
	494	(defun mm-display-elisp-inline (handle)
	495	(mm-display-inline-fontify handle 'emacs-lisp-mode))
	496
23f87bed MB	497	;; id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
	498	;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
	499	(defvar mm-pkcs7-signed-magic
	500	(mm-string-as-unibyte
	501	(apply 'concat
	502	(mapcar 'char-to-string
	503	(list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
	504	?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
	505	?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
	506	?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02)))))
	507
	508	;; id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
	509	;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
	510	(defvar mm-pkcs7-enveloped-magic
	511	(mm-string-as-unibyte
	512	(apply 'concat
	513	(mapcar 'char-to-string
	514	(list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
	515	?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
	516	?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
	517	?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03)))))
	518
	519	(defun mm-view-pkcs7-get-type (handle)
	520	(mm-with-unibyte-buffer
	521	(mm-insert-part handle)
	522	(cond ((looking-at mm-pkcs7-enveloped-magic)
	523	'enveloped)
	524	((looking-at mm-pkcs7-signed-magic)
	525	'signed)
	526	(t
	527	(error "Could not identify PKCS#7 type")))))
	528
	529	(defun mm-view-pkcs7 (handle)
	530	(case (mm-view-pkcs7-get-type handle)
	531	(enveloped (mm-view-pkcs7-decrypt handle))
	532	(signed (mm-view-pkcs7-verify handle))
	533	(otherwise (error "Unknown or unimplemented PKCS#7 type"))))
	534
	535	(defun mm-view-pkcs7-verify (handle)
	536	;; A bogus implementation of PKCS#7. FIXME::
	537	(mm-insert-part handle)
	538	(goto-char (point-min))
	539	(if (search-forward "Content-Type: " nil t)
	540	(delete-region (point-min) (match-beginning 0)))
	541	(goto-char (point-max))
	542	(if (re-search-backward "--\r?\n?" nil t)
	543	(delete-region (match-end 0) (point-max)))
	544	(goto-char (point-min))
	545	(while (search-forward "\r\n" nil t)
	546	(replace-match "\n"))
	547	(message "Verify signed PKCS#7 message is unimplemented.")
	548	(sit-for 1)
	549	t)
	550
	551	(autoload 'gnus-completing-read-maybe-default "gnus-util" nil nil 'macro)
	552
	553	(defun mm-view-pkcs7-decrypt (handle)
	554	(insert-buffer-substring (mm-handle-buffer handle))
	555	(goto-char (point-min))
	556	(insert "MIME-Version: 1.0\n")
	557	(mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
	558	(smime-decrypt-region
	559	(point-min) (point-max)
	560	(if (= (length smime-keys) 1)
561	(cadar smime-keys)
562	(smime-get-key-by-email
563	(gnus-completing-read-maybe-default
564	(concat "Decipher using which key? "
565	(if smime-keys (concat "(default " (caar smime-keys) ") ")
566	""))
567	smime-keys nil nil nil nil (car-safe (car-safe smime-keys))))))
568	(goto-char (point-min))
569	(while (search-forward "\r\n" nil t)
570	(replace-match "\n"))
571	(goto-char (point-min)))
572
c113de23 GM	573	(provide 'mm-view)
c113de23 GM	574
ab5796a9	575	;;; arch-tag: b60e749a-d05c-47f2-bccd-bdaa59327cb2
715a2ca2	576	;;; mm-view.el ends here