[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,
;;   2005 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., 51 Franklin Street, Fifth Floor,
;; Boston, MA 02110-1301, 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 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)

(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))
      (when (or (equal type "enriched")
		(equal type "richtext"))
	(set-text-properties (point-min) (point-max) nil)
	(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)
	    (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.
	    (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 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
e84b4b86 TTN	2
	3	;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
	4	;; 2005 Free Software Foundation, Inc.
c113de23 GM	5
	6	;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
	7	;; This file is part of GNU Emacs.
	8
	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)
	12	;; any later version.
	13
	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.
	18
	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
3a35cf56 LK	21	;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
3a35cf56 LK	22	;; Boston, MA 02110-1301, USA.
c113de23 GM	23
	24	;;; Commentary:
	25
	26	;;; Code:
	27
	28	(eval-when-compile (require 'cl))
	29	(require 'mail-parse)
	30	(require 'mailcap)
	31	(require 'mm-bodies)
	32	(require 'mm-decode)
	33
	34	(eval-and-compile
	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")
23f87bed	39	(autoload 'html2text "html2text")
39e72e55 GM	40	(unless (fboundp 'diff-mode)
39e72e55 GM	41	(autoload 'diff-mode "diff-mode" "" t nil)))
c113de23	42
dd3eac76 JB	43	(defvar gnus-article-mime-handles)
	44	(defvar gnus-newsgroup-charset)
	45	(defvar smime-keys)
	46	(defvar w3m-cid-retrieve-function-alist)
	47	(defvar w3m-current-buffer)
	48	(defvar w3m-display-inline-images)
	49	(defvar w3m-minor-mode-map)
	50
23f87bed MB	51	(defvar mm-text-html-renderer-alist
	52	'((w3 . mm-inline-text-html-render-with-w3)
	53	(w3m . mm-inline-text-html-render-with-w3m)
	54	(w3m-standalone mm-inline-render-with-stdin nil
	55	"w3m" "-dump" "-T" "text/html")
	56	(links mm-inline-render-with-file
	57	mm-links-remove-leading-blank
	58	"links" "-dump" file)
	59	(lynx mm-inline-render-with-stdin nil
	60	"lynx" "-dump" "-force_html" "-stdin" "-nolist")
	61	(html2text mm-inline-render-with-function html2text))
	62	"The attributes of renderer types for text/html.")
	63
	64	(defvar mm-text-html-washer-alist
	65	'((w3 . gnus-article-wash-html-with-w3)
	66	(w3m . gnus-article-wash-html-with-w3m)
	67	(w3m-standalone mm-inline-wash-with-stdin nil
	68	"w3m" "-dump" "-T" "text/html")
	69	(links mm-inline-wash-with-file
	70	mm-links-remove-leading-blank
	71	"links" "-dump" file)
	72	(lynx mm-inline-wash-with-stdin nil
	73	"lynx" "-dump" "-force_html" "-stdin" "-nolist")
	74	(html2text html2text))
	75	"The attributes of washer types for text/html.")
	76
	77	;;; Internal variables.
	78
c113de23 GM	79	;;;
	80	;;; Functions for displaying various formats inline
	81	;;;
23f87bed	82
c113de23 GM	83	(defun mm-inline-image-emacs (handle)
	84	(let ((b (point-marker))
	85	buffer-read-only)
c113de23	86	(put-image (mm-get-image handle) b)
23f87bed	87	(insert "\n\n")
c113de23 GM	88	(mm-handle-set-undisplayer
c113de23 GM	89	handle
23f87bed MB	90	`(lambda ()
	91	(let ((b ,b)
	92	buffer-read-only)
	93	(remove-images b b)
	94	(delete-region b (+ b 2)))))))
c113de23 GM	95
c113de23 GM	96	(defun mm-inline-image-xemacs (handle)
23f87bed MB	97	(insert "\n\n")
	98	(forward-char -2)
	99	(let ((annot (make-annotation (mm-get-image handle) nil 'text))
c113de23	100	buffer-read-only)
c113de23 GM	101	(mm-handle-set-undisplayer
	102	handle
	103	`(lambda ()
23f87bed MB	104	(let ((b ,(point-marker))
23f87bed MB	105	buffer-read-only)
c113de23	106	(delete-annotation ,annot)
23f87bed	107	(delete-region (- b 2) b))))
c113de23 GM	108	(set-extent-property annot 'mm t)
	109	(set-extent-property annot 'duplicable t)))
	110
	111	(eval-and-compile
722a8409	112	(if (featurep 'xemacs)
c113de23 GM	113	(defalias 'mm-inline-image 'mm-inline-image-xemacs)
	114	(defalias 'mm-inline-image 'mm-inline-image-emacs)))
	115
	116	(defvar mm-w3-setup nil)
	117	(defun mm-setup-w3 ()
	118	(unless mm-w3-setup
	119	(require 'w3)
	120	(w3-do-setup)
	121	(require 'url)
	122	(require 'w3-vars)
	123	(require 'url-vars)
	124	(setq mm-w3-setup t)))
	125
23f87bed MB	126	(defun mm-inline-text-html-render-with-w3 (handle)
	127	(mm-setup-w3)
	128	(let ((text (mm-get-part handle))
	129	(b (point))
	130	(url-standalone-mode t)
	131	(url-gateway-unplugged t)
	132	(w3-honor-stylesheets nil)
	133	(url-current-object
	134	(url-generic-parse-url (format "cid:%s" (mm-handle-id handle))))
	135	(width (window-width))
	136	(charset (mail-content-type-get
	137	(mm-handle-type handle) 'charset)))
	138	(save-excursion
	139	(insert text)
	140	(save-restriction
	141	(narrow-to-region b (point))
	142	(goto-char (point-min))
	143	(if (or (and (boundp 'w3-meta-content-type-charset-regexp)
	144	(re-search-forward
	145	w3-meta-content-type-charset-regexp nil t))
	146	(and (boundp 'w3-meta-charset-content-type-regexp)
	147	(re-search-forward
	148	w3-meta-charset-content-type-regexp nil t)))
	149	(setq charset
	150	(or (let ((bsubstr (buffer-substring-no-properties
	151	(match-beginning 2)
	152	(match-end 2))))
	153	(if (fboundp 'w3-coding-system-for-mime-charset)
	154	(w3-coding-system-for-mime-charset bsubstr)
	155	(mm-charset-to-coding-system bsubstr)))
	156	charset)))
	157	(delete-region (point-min) (point-max))
	158	(insert (mm-decode-string text charset))
	159	(save-window-excursion
c113de23	160	(save-restriction
23f87bed MB	161	(let ((w3-strict-width width)
	162	;; Don't let w3 set the global version of
	163	;; this variable.
	164	(fill-column fill-column))
	165	(if (or debug-on-error debug-on-quit)
	166	(w3-region (point-min) (point-max))
	167	(condition-case ()
	168	(w3-region (point-min) (point-max))
	169	(error
	170	(delete-region (point-min) (point-max))
	171	(let ((b (point))
	172	(charset (mail-content-type-get
	173	(mm-handle-type handle) 'charset)))
	174	(if (or (eq charset 'gnus-decoded)
	175	(eq mail-parse-charset 'gnus-decoded))
	176	(save-restriction
	177	(narrow-to-region (point) (point))
	178	(mm-insert-part handle)
	179	(goto-char (point-max)))
	180	(insert (mm-decode-string (mm-get-part handle)
	181	charset))))
	182	(message
	183	"Error while rendering html; showing as text/plain")))))))
	184	(mm-handle-set-undisplayer
	185	handle
	186	`(lambda ()
	187	(let (buffer-read-only)
	188	(if (functionp 'remove-specifier)
	189	(mapcar (lambda (prop)
	190	(remove-specifier
	191	(face-property 'default prop)
	192	(current-buffer)))
	193	'(background background-pixmap foreground)))
	194	(delete-region ,(point-min-marker)
	195	,(point-max-marker)))))))))
	196
	197	(defvar mm-w3m-setup nil
	198	"Whether gnus-article-mode has been setup to use emacs-w3m.")
	199
	200	(defun mm-setup-w3m ()
	201	"Setup gnus-article-mode to use emacs-w3m."
	202	(unless mm-w3m-setup
	203	(require 'w3m)
	204	(unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
	205	(push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
	206	w3m-cid-retrieve-function-alist))
	207	(setq mm-w3m-setup t))
	208	(setq w3m-display-inline-images mm-inline-text-html-with-images))
	209
	210	(defun mm-w3m-cid-retrieve-1 (url handle)
54506618 MB	211	(dolist (elem handle)
	212	(when (listp elem)
	213	(if (equal url (mm-handle-id elem))
	214	(progn
	215	(mm-insert-part elem)
	216	(throw 'found-handle (mm-handle-media-type elem))))
	217	(if (equal "multipart" (mm-handle-media-supertype elem))
	218	(mm-w3m-cid-retrieve-1 url elem)))))
23f87bed MB	219
	220	(defun mm-w3m-cid-retrieve (url &rest args)
	221	"Insert a content pointed by URL if it has the cid: scheme."
	222	(when (string-match "\\`cid:" url)
	223	(catch 'found-handle
	224	(mm-w3m-cid-retrieve-1 (concat "<" (substring url (match-end 0)) ">")
	225	(with-current-buffer w3m-current-buffer
	226	gnus-article-mime-handles)))))
	227
	228	(defun mm-inline-text-html-render-with-w3m (handle)
	229	"Render a text/html part using emacs-w3m."
	230	(mm-setup-w3m)
	231	(let ((text (mm-get-part handle))
	232	(b (point))
	233	(charset (mail-content-type-get (mm-handle-type handle) 'charset)))
	234	(save-excursion
	235	(insert (if charset (mm-decode-string text charset) text))
	236	(save-restriction
	237	(narrow-to-region b (point))
	238	(unless charset
	239	(goto-char (point-min))
	240	(when (setq charset (w3m-detect-meta-charset))
c113de23	241	(delete-region (point-min) (point-max))
23f87bed MB	242	(insert (mm-decode-string text charset))))
	243	(let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
	244	w3m-force-redisplay)
	245	(w3m-region (point-min) (point-max) nil charset))
	246	(when (and mm-inline-text-html-with-w3m-keymap
	247	(boundp 'w3m-minor-mode-map)
	248	w3m-minor-mode-map)
	249	(add-text-properties
	250	(point-min) (point-max)
	251	(list 'keymap w3m-minor-mode-map
	252	;; Put the mark meaning this part was rendered by emacs-w3m.
58090a8d MB	253	'mm-inline-text-html-with-w3m t)))
	254	(mm-handle-set-undisplayer
	255	handle
	256	`(lambda ()
	257	(let (buffer-read-only)
	258	(if (functionp 'remove-specifier)
	259	(mapcar (lambda (prop)
	260	(remove-specifier
	261	(face-property 'default prop)
	262	(current-buffer)))
	263	'(background background-pixmap foreground)))
	264	(delete-region ,(point-min-marker)
	265	,(point-max-marker)))))))))
23f87bed MB	266
	267	(defun mm-links-remove-leading-blank ()
	268	;; Delete the annoying three spaces preceding each line of links
	269	;; output.
	270	(goto-char (point-min))
	271	(while (re-search-forward "^ " nil t)
	272	(delete-region (match-beginning 0) (match-end 0))))
	273
	274	(defun mm-inline-wash-with-file (post-func cmd &rest args)
	275	(let ((file (mm-make-temp-file
	276	(expand-file-name "mm" mm-tmp-directory))))
	277	(let ((coding-system-for-write 'binary))
	278	(write-region (point-min) (point-max) file nil 'silent))
	279	(delete-region (point-min) (point-max))
	280	(unwind-protect
	281	(apply 'call-process cmd nil t nil (mapcar 'eval args))
	282	(delete-file file))
	283	(and post-func (funcall post-func))))
	284
	285	(defun mm-inline-wash-with-stdin (post-func cmd &rest args)
	286	(let ((coding-system-for-write 'binary))
	287	(apply 'call-process-region (point-min) (point-max)
	288	cmd t t nil args))
	289	(and post-func (funcall post-func)))
	290
	291	(defun mm-inline-render-with-file (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-file post-func cmd args)
	298	(buffer-string)))))
	299
	300	(defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
	301	(let ((source (mm-get-part handle)))
	302	(mm-insert-inline
	303	handle
	304	(mm-with-unibyte-buffer
	305	(insert source)
	306	(apply 'mm-inline-wash-with-stdin post-func cmd args)
	307	(buffer-string)))))
	308
	309	(defun mm-inline-render-with-function (handle func &rest args)
	310	(let ((source (mm-get-part handle))
	311	(charset (mail-content-type-get (mm-handle-type handle) 'charset)))
	312	(mm-insert-inline
	313	handle
	314	(mm-with-multibyte-buffer
	315	(insert (if charset
	316	(mm-decode-string source charset)
	317	source))
	318	(apply func args)
	319	(buffer-string)))))
	320
	321	(defun mm-inline-text-html (handle)
	322	(let* ((func (or mm-inline-text-html-renderer mm-text-html-renderer))
	323	(entry (assq func mm-text-html-renderer-alist))
	324	buffer-read-only)
	325	(if entry
	326	(setq func (cdr entry)))
	327	(cond
	328	((functionp func)
	329	(funcall func handle))
c113de23	330	(t
23f87bed MB	331	(apply (car func) handle (cdr func))))))
	332
	333	(defun mm-inline-text-vcard (handle)
	334	(let (buffer-read-only)
	335	(mm-insert-inline
	336	handle
	337	(concat "\n-- \n"
	338	(ignore-errors
	339	(if (fboundp 'vcard-pretty-print)
	340	(vcard-pretty-print (mm-get-part handle))
	341	(vcard-format-string
	342	(vcard-parse-string (mm-get-part handle)
	343	'vcard-standard-filter))))))))
	344
	345	(defun mm-inline-text (handle)
	346	(let ((b (point))
	347	(type (mm-handle-media-subtype handle))
	348	(charset (mail-content-type-get
	349	(mm-handle-type handle) 'charset))
	350	buffer-read-only)
	351	(if (or (eq charset 'gnus-decoded)
	352	;; This is probably not entirely correct, but
	353	;; makes rfc822 parts with embedded multiparts work.
	354	(eq mail-parse-charset 'gnus-decoded))
c113de23	355	(save-restriction
23f87bed MB	356	(narrow-to-region (point) (point))
	357	(mm-insert-part handle)
	358	(goto-char (point-max)))
	359	(insert (mm-decode-string (mm-get-part handle) charset)))
	360	(when (and (equal type "plain")
	361	(equal (cdr (assoc 'format (mm-handle-type handle)))
	362	"flowed"))
	363	(save-restriction
	364	(narrow-to-region b (point))
	365	(goto-char b)
	366	(fill-flowed)
	367	(goto-char (point-max))))
	368	(save-restriction
	369	(narrow-to-region b (point))
23f87bed MB	370	(when (or (equal type "enriched")
23f87bed MB	371	(equal type "richtext"))
53cfefc8	372	(set-text-properties (point-min) (point-max) nil)
23f87bed MB	373	(ignore-errors
	374	(enriched-decode (point-min) (point-max))))
	375	(mm-handle-set-undisplayer
	376	handle
	377	`(lambda ()
	378	(let (buffer-read-only)
	379	(delete-region ,(point-min-marker)
	380	,(point-max-marker))))))))
c113de23 GM	381
	382	(defun mm-insert-inline (handle text)
	383	"Insert TEXT inline from HANDLE."
23f87bed	384	(let ((b (point)))
c113de23 GM	385	(insert text)
	386	(mm-handle-set-undisplayer
	387	handle
	388	`(lambda ()
	389	(let (buffer-read-only)
	390	(delete-region ,(set-marker (make-marker) b)
	391	,(set-marker (make-marker) (point))))))))
	392
	393	(defun mm-inline-audio (handle)
	394	(message "Not implemented"))
	395
	396	(defun mm-view-sound-file ()
	397	(message "Not implemented"))
	398
	399	(defun mm-w3-prepare-buffer ()
	400	(require 'w3)
6833e8ba	401	(let ((url-standalone-mode t)
23f87bed MB	402	(url-gateway-unplugged t)
23f87bed MB	403	(w3-honor-stylesheets nil))
c113de23 GM	404	(w3-prepare-buffer)))
	405
	406	(defun mm-view-message ()
	407	(mm-enable-multibyte)
	408	(let (handles)
	409	(let (gnus-article-mime-handles)
	410	;; Double decode problem may happen. See mm-inline-message.
	411	(run-hooks 'gnus-article-decode-hook)
	412	(gnus-article-prepare-display)
	413	(setq handles gnus-article-mime-handles))
	414	(when handles
	415	(setq gnus-article-mime-handles
23f87bed	416	(mm-merge-handles gnus-article-mime-handles handles))))
c113de23 GM	417	(fundamental-mode)
	418	(goto-char (point-min)))
	419
	420	(defun mm-inline-message (handle)
	421	(let ((b (point))
4e728580	422	(bolp (bolp))
c113de23 GM	423	(charset (mail-content-type-get
	424	(mm-handle-type handle) 'charset))
	425	gnus-displaying-mime handles)
	426	(when (and charset
	427	(stringp charset))
	428	(setq charset (intern (downcase charset)))
	429	(when (eq charset 'us-ascii)
	430	(setq charset nil)))
	431	(save-excursion
	432	(save-restriction
	433	(narrow-to-region b b)
	434	(mm-insert-part handle)
	435	(let (gnus-article-mime-handles
4e728580 SZ	436	;; disable prepare hook
4e728580 SZ	437	gnus-article-prepare-hook
c113de23 GM	438	(gnus-newsgroup-charset
c113de23 GM	439	(or charset gnus-newsgroup-charset)))
23f87bed MB	440	(let ((gnus-original-article-buffer (mm-handle-buffer handle)))
23f87bed MB	441	(run-hooks 'gnus-article-decode-hook))
c113de23 GM	442	(gnus-article-prepare-display)
c113de23 GM	443	(setq handles gnus-article-mime-handles))
4e728580 SZ	444	(goto-char (point-min))
	445	(unless bolp
	446	(insert "\n"))
c113de23 GM	447	(goto-char (point-max))
	448	(unless (bolp)
	449	(insert "\n"))
	450	(insert "----------\n\n")
	451	(when handles
	452	(setq gnus-article-mime-handles
23f87bed	453	(mm-merge-handles gnus-article-mime-handles handles)))
c113de23 GM	454	(mm-handle-set-undisplayer
	455	handle
	456	`(lambda ()
	457	(let (buffer-read-only)
722a8409	458	(if (fboundp 'remove-specifier)
c113de23 GM	459	;; This is only valid on XEmacs.
	460	(mapcar (lambda (prop)
	461	(remove-specifier
	462	(face-property 'default prop) (current-buffer)))
722a8409	463	'(background background-pixmap foreground)))
c113de23 GM	464	(delete-region ,(point-min-marker) ,(point-max-marker)))))))))
c113de23 GM	465
ce9401f3	466	(defun mm-display-inline-fontify (handle mode)
c113de23	467	(let (text)
23f87bed MB	468	;; XEmacs @#$@ version of font-lock refuses to fully turn itself
	469	;; on for buffers whose name begins with " ". That's why we use
	470	;; save-current-buffer/get-buffer-create rather than
	471	;; with-temp-buffer.
	472	(save-current-buffer
	473	(set-buffer (generate-new-buffer "fontification"))
	474	(unwind-protect
	475	(progn
	476	(buffer-disable-undo)
	477	(mm-insert-part handle)
23f87bed	478	(require 'font-lock)
d752cf53 MB	479	(let ((font-lock-maximum-size nil)
	480	;; Disable support modes, e.g., jit-lock, lazy-lock, etc.
	481	(font-lock-mode-hook nil)
	482	(font-lock-support-mode nil)
	483	;; I find font-lock a bit too verbose.
	484	(font-lock-verbose nil))
	485	(funcall mode)
	486	;; The mode function might have already turned on font-lock.
	487	(unless (symbol-value 'font-lock-mode)
	488	(font-lock-fontify-buffer)))
23f87bed MB	489	;; By default, XEmacs font-lock uses non-duplicable text
	490	;; properties. This code forces all the text properties
	491	;; to be copied along with the text.
	492	(when (fboundp 'extent-list)
	493	(map-extents (lambda (ext ignored)
	494	(set-extent-property ext 'duplicable t)
	495	nil)
	496	nil nil nil nil nil 'text-prop))
	497	(setq text (buffer-string)))
	498	(kill-buffer (current-buffer))))
c113de23 GM	499	(mm-insert-inline handle text)))
c113de23 GM	500
23f87bed MB	501	;; Shouldn't these functions check whether the user even wants to use
	502	;; font-lock? At least under XEmacs, this fontification is pretty
	503	;; much unconditional. Also, it would be nice to change for the size
	504	;; of the fontified region.
	505
ce9401f3 DL	506	(defun mm-display-patch-inline (handle)
	507	(mm-display-inline-fontify handle 'diff-mode))
	508
	509	(defun mm-display-elisp-inline (handle)
	510	(mm-display-inline-fontify handle 'emacs-lisp-mode))
	511
23f87bed MB	512	;; id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
	513	;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
	514	(defvar mm-pkcs7-signed-magic
	515	(mm-string-as-unibyte
	516	(apply 'concat
	517	(mapcar 'char-to-string
	518	(list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
	519	?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
	520	?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
	521	?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x02)))))
	522
	523	;; id-envelopedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
	524	;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 3 }
	525	(defvar mm-pkcs7-enveloped-magic
	526	(mm-string-as-unibyte
	527	(apply 'concat
	528	(mapcar 'char-to-string
	529	(list ?\x30 ?\x5c ?\x28 ?\x80 ?\x5c ?\x7c ?\x81 ?\x2e ?\x5c
	530	?\x7c ?\x82 ?\x2e ?\x2e ?\x5c ?\x7c ?\x83 ?\x2e ?\x2e
	531	?\x2e ?\x5c ?\x29 ?\x06 ?\x09 ?\x5c ?\x2a ?\x86 ?\x48
	532	?\x86 ?\xf7 ?\x0d ?\x01 ?\x07 ?\x03)))))
	533
	534	(defun mm-view-pkcs7-get-type (handle)
	535	(mm-with-unibyte-buffer
	536	(mm-insert-part handle)
	537	(cond ((looking-at mm-pkcs7-enveloped-magic)
	538	'enveloped)
	539	((looking-at mm-pkcs7-signed-magic)
	540	'signed)
	541	(t
	542	(error "Could not identify PKCS#7 type")))))
	543
	544	(defun mm-view-pkcs7 (handle)
	545	(case (mm-view-pkcs7-get-type handle)
	546	(enveloped (mm-view-pkcs7-decrypt handle))
	547	(signed (mm-view-pkcs7-verify handle))
	548	(otherwise (error "Unknown or unimplemented PKCS#7 type"))))
	549
	550	(defun mm-view-pkcs7-verify (handle)
	551	;; A bogus implementation of PKCS#7. FIXME::
	552	(mm-insert-part handle)
	553	(goto-char (point-min))
	554	(if (search-forward "Content-Type: " nil t)
	555	(delete-region (point-min) (match-beginning 0)))
	556	(goto-char (point-max))
	557	(if (re-search-backward "--\r?\n?" nil t)
	558	(delete-region (match-end 0) (point-max)))
	559	(goto-char (point-min))
	560	(while (search-forward "\r\n" nil t)
	561	(replace-match "\n"))
	562	(message "Verify signed PKCS#7 message is unimplemented.")
	563	(sit-for 1)
	564	t)
	565
	566	(autoload 'gnus-completing-read-maybe-default "gnus-util" nil nil 'macro)
	567
	568	(defun mm-view-pkcs7-decrypt (handle)
	569	(insert-buffer-substring (mm-handle-buffer handle))
	570	(goto-char (point-min))
	571	(insert "MIME-Version: 1.0\n")
	572	(mm-insert-headers "application/pkcs7-mime" "base64" "smime.p7m")
	573	(smime-decrypt-region
	574	(point-min) (point-max)
	575	(if (= (length smime-keys) 1)
576	(cadar smime-keys)
577	(smime-get-key-by-email
578	(gnus-completing-read-maybe-default
81df110a RF	579	(concat "Decipher using key"
	580	(if smime-keys
	581	(concat " (default " (caar smime-keys) "): ")
	582	": "))
23f87bed MB	583	smime-keys nil nil nil nil (car-safe (car-safe smime-keys))))))
	584	(goto-char (point-min))
	585	(while (search-forward "\r\n" nil t)
	586	(replace-match "\n"))
	587	(goto-char (point-min)))
	588
c113de23 GM	589	(provide 'mm-view)
c113de23 GM	590
ab5796a9	591	;;; arch-tag: b60e749a-d05c-47f2-bccd-bdaa59327cb2
715a2ca2	592	;;; mm-view.el ends here