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emacs/lisp/gnus/mm-view.el
Miles Bader e52cac8805 Merge from gnus--devo--0 
Revision: emacs@sv.gnu.org/emacs--devo--0--patch-1429
2008-09-25 15:38:29 +00:00

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;;; mm-view.el --- functions for viewing MIME objects
;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004, 2005, 2006,
;; 2007, 2008 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 3 of the License, 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. If not, see <http://www.gnu.org/licenses/>.
;;; Commentary:
;;; Code:
(eval-and-compile
(unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
(eval-when-compile (require 'cl))
(require 'mail-parse)
(require 'mailcap)
(require 'mm-bodies)
(require 'mm-decode)
(require 'smime)
(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)
(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-text-html-render-with-w3m-standalone)
(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 . gnus-article-wash-html-with-w3m-standalone)
(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.")
(defcustom mm-fill-flowed t
"If non-nil a format=flowed article will be displayed flowed."
:type 'boolean
:version "22.1"
:group 'mime-display)
;;; Internal variables.
;;;
;;; Functions for displaying various formats inline
;;;
(defun mm-inline-image-emacs (handle)
(let ((b (point-marker))
(inhibit-read-only t))
(put-image (mm-get-image handle) b)
(insert "\n\n")
(mm-handle-set-undisplayer
handle
`(lambda ()
(let ((b ,b)
(inhibit-read-only t))
(remove-images b b)
(delete-region b (+ b 2)))))))
(defun mm-inline-image-xemacs (handle)
(when (featurep 'xemacs)
(insert "\n\n")
(forward-char -2)
(let ((annot (make-annotation (mm-get-image handle) nil 'text))
(inhibit-read-only t))
(mm-handle-set-undisplayer
handle
`(lambda ()
(let ((b ,(point-marker))
(inhibit-read-only t))
(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)))
;; 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))
(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 (if charset (mm-decode-string text charset) text))
(save-restriction
(narrow-to-region b (point))
(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)))
(setq charset
(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))))
(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 ((inhibit-read-only t))
,@(if (functionp 'remove-specifier)
'((dolist (prop '(background background-pixmap foreground))
(remove-specifier
(face-property 'default prop)
(current-buffer)))))
(delete-region ,(point-min-marker)
,(point-max-marker)))))))))
(defvar mm-w3m-setup nil
"Whether gnus-article-mode has been setup to use emacs-w3m.")
;; External.
(declare-function w3m-detect-meta-charset "ext:w3m" ())
(declare-function w3m-region "ext:w3m" (start end &optional url charset))
(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 (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)))))
(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)
(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)))))
(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 (or (mail-content-type-get (mm-handle-type handle) 'charset)
mail-parse-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 ((inhibit-read-only t))
(delete-region ,(point-min-marker)
,(point-max-marker)))))))))
(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 "\
\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)))
(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))))
(defun mm-inline-text-html-render-with-w3m-standalone (handle)
"Render a text/html part using w3m."
(if (mm-w3m-standalone-supports-m17n-p)
(let ((source (mm-get-part handle))
(charset (or (mail-content-type-get (mm-handle-type handle)
'charset)
(symbol-name mail-parse-charset)))
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")))
(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 (or (mail-content-type-get (mm-handle-type handle) 'charset)
mail-parse-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))
(inhibit-read-only t))
(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 ((inhibit-read-only t))
(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))
(inhibit-read-only t))
(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 mm-fill-flowed
(equal type "plain")
(equal (cdr (assoc 'format (mm-handle-type handle)))
"flowed"))
(save-restriction
(narrow-to-region b (point))
(goto-char b)
(fill-flowed nil (equal (cdr (assoc 'delsp (mm-handle-type handle)))
"yes"))
(goto-char (point-max))))
(save-restriction
(narrow-to-region b (point))
(when (member type '("enriched" "richtext"))
(set-text-properties (point-min) (point-max) nil)
(ignore-errors
(enriched-decode (point-min) (point-max))))
(mm-handle-set-undisplayer
handle
`(lambda ()
(let ((inhibit-read-only t))
(delete-region ,(point-min-marker)
,(point-max-marker))))))))
(defun mm-insert-inline (handle text)
"Insert TEXT inline from HANDLE."
(let ((b (point)))
(insert text)
(unless (bolp)
(insert "\n"))
(mm-handle-set-undisplayer
handle
`(lambda ()
(let ((inhibit-read-only t))
(delete-region ,(copy-marker b)
,(copy-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
(unless (eq charset 'gnus-decoded) ;; mm-uu might set it.
(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 ((inhibit-read-only t))
(if (fboundp 'remove-specifier)
;; This is only valid on XEmacs.
(dolist (prop '(background background-pixmap foreground))
(remove-specifier
(face-property 'default prop) (current-buffer))))
(delete-region ,(point-min-marker) ,(point-max-marker)))))))))
(defun mm-display-inline-fontify (handle mode)
(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))))
;; XEmacs @#$@ version of font-lock refuses to fully turn itself
;; on for buffers whose name begins with " ". That's why we use
;; `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.
(when (featurep 'xemacs)
(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))
(defun mm-display-dns-inline (handle)
(mm-display-inline-fontify handle 'dns-mode))
;; id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
(defvar mm-pkcs7-signed-magic
"\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
"\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)
(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)))
(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
(completing-read
(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
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