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620 lines
20 KiB
EmacsLisp
620 lines
20 KiB
EmacsLisp
;;; mm-view.el --- functions for viewing MIME objects
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;; Copyright (C) 1998-2018 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
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;; This file is part of GNU Emacs.
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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
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;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
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;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
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;; GNU General Public License for more details.
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;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs. If not, see <https://www.gnu.org/licenses/>.
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;;; Commentary:
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;;; Code:
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(eval-when-compile (require 'cl))
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(require 'mail-parse)
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(require 'mailcap)
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(require 'mm-bodies)
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(require 'mm-decode)
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(require 'smime)
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(require 'mml-smime)
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(autoload 'gnus-completing-read "gnus-util")
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(autoload 'gnus-article-prepare-display "gnus-art")
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(autoload 'vcard-parse-string "vcard")
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(autoload 'vcard-format-string "vcard")
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(autoload 'fill-flowed "flow-fill")
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(autoload 'html2text "html2text" nil t)
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(defvar gnus-article-mime-handles)
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(defvar gnus-newsgroup-charset)
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(defvar smime-keys)
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(defvar w3m-cid-retrieve-function-alist)
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(defvar w3m-current-buffer)
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(defvar w3m-display-inline-images)
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(defvar w3m-minor-mode-map)
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(defvar mm-text-html-renderer-alist
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'((shr . mm-shr)
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(w3m . mm-inline-text-html-render-with-w3m)
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(w3m-standalone . mm-inline-text-html-render-with-w3m-standalone)
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(gnus-w3m . gnus-article-html)
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(links mm-inline-render-with-file
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mm-links-remove-leading-blank
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"links" "-dump" file)
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(lynx mm-inline-render-with-stdin nil
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"lynx" "-dump" "-force_html" "-stdin" "-nolist")
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(html2text mm-inline-render-with-function html2text))
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"The attributes of renderer types for text/html.")
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(defcustom mm-fill-flowed t
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"If non-nil a format=flowed article will be displayed flowed."
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:type 'boolean
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:version "22.1"
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:group 'mime-display)
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(defcustom mm-inline-large-images-proportion 0.9
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"Maximum proportion of large image resized when
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`mm-inline-large-images' is set to resize."
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:type 'float
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:version "24.1"
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:group 'mime-display)
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;;; Internal variables.
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;;;
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;;; Functions for displaying various formats inline
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;;;
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(autoload 'gnus-rescale-image "gnus-util")
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(defun mm-inline-image (handle)
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(let ((b (point-marker))
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(inhibit-read-only t))
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(put-image
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(let ((image (mm-get-image handle)))
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(if (eq mm-inline-large-images 'resize)
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(gnus-rescale-image
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image
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(let ((edges (window-inside-pixel-edges
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(get-buffer-window (current-buffer)))))
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(cons (truncate (* mm-inline-large-images-proportion
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(- (nth 2 edges) (nth 0 edges))))
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(truncate (* mm-inline-large-images-proportion
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(- (nth 3 edges) (nth 1 edges)))))))
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image))
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b)
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(insert "\n")
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(mm-handle-set-undisplayer
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handle
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`(lambda ()
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(let ((b ,b)
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(inhibit-read-only t))
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(remove-images b b)
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(delete-region b (1+ b)))))))
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(defvar mm-w3m-setup nil
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"Whether gnus-article-mode has been setup to use emacs-w3m.")
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;; External.
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(declare-function w3m-detect-meta-charset "ext:w3m" ())
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(declare-function w3m-region "ext:w3m" (start end &optional url charset))
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(defun mm-setup-w3m ()
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"Setup gnus-article-mode to use emacs-w3m."
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(unless mm-w3m-setup
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(require 'w3m)
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(unless (assq 'gnus-article-mode w3m-cid-retrieve-function-alist)
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(push (cons 'gnus-article-mode 'mm-w3m-cid-retrieve)
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w3m-cid-retrieve-function-alist))
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(setq mm-w3m-setup t))
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(setq w3m-display-inline-images (not mm-html-inhibit-images)))
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(defun mm-w3m-cid-retrieve-1 (url handle)
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(dolist (elem handle)
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(when (consp elem)
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(when (equal url (mm-handle-id elem))
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(mm-insert-part elem)
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(throw 'found-handle (mm-handle-media-type elem)))
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(when (and (stringp (car elem))
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(equal "multipart" (mm-handle-media-supertype elem)))
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(mm-w3m-cid-retrieve-1 url elem)))))
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(defun mm-w3m-cid-retrieve (url &rest args)
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"Insert a content pointed by URL if it has the cid: scheme."
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(when (string-match "\\`cid:" url)
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(or (catch 'found-handle
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(mm-w3m-cid-retrieve-1
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(setq url (concat "<" (substring url (match-end 0)) ">"))
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(with-current-buffer w3m-current-buffer
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gnus-article-mime-handles)))
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(prog1
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nil
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(message "Failed to find \"Content-ID: %s\"" url)))))
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(defun mm-inline-text-html-render-with-w3m (handle)
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"Render a text/html part using emacs-w3m."
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(mm-setup-w3m)
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(let ((text (mm-get-part handle))
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(b (point))
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(charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
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mail-parse-charset)))
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(save-excursion
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(insert (if charset (mm-decode-string text charset) text))
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(save-restriction
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(narrow-to-region b (point))
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(unless charset
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(goto-char (point-min))
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(when (setq charset (w3m-detect-meta-charset))
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(delete-region (point-min) (point-max))
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(insert (mm-decode-string text charset))))
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(let ((w3m-safe-url-regexp mm-w3m-safe-url-regexp)
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w3m-force-redisplay)
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(w3m-region (point-min) (point-max) nil charset))
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;; Put the mark meaning this part was rendered by emacs-w3m.
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(put-text-property (point-min) (point-max)
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'mm-inline-text-html-with-w3m t)
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(when (and mm-inline-text-html-with-w3m-keymap
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(boundp 'w3m-minor-mode-map)
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w3m-minor-mode-map)
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(if (and (boundp 'w3m-link-map)
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w3m-link-map)
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(let* ((start (point-min))
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(end (point-max))
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(on (get-text-property start 'w3m-href-anchor))
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(map (copy-keymap w3m-link-map))
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next)
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(set-keymap-parent map w3m-minor-mode-map)
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(while (< start end)
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(if on
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(progn
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(setq next (or (text-property-any start end
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'w3m-href-anchor nil)
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end))
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(put-text-property start next 'keymap map))
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(setq next (or (text-property-not-all start end
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'w3m-href-anchor nil)
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end))
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(put-text-property start next 'keymap w3m-minor-mode-map))
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(setq start next
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on (not on))))
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(put-text-property (point-min) (point-max)
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'keymap w3m-minor-mode-map)))
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(mm-handle-set-undisplayer
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handle
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`(lambda ()
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(let ((inhibit-read-only t))
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(delete-region ,(point-min-marker)
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,(point-max-marker)))))))))
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(defcustom mm-w3m-standalone-supports-m17n-p 'undecided
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"T means the w3m command supports the m17n feature."
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:type '(choice (const nil) (const t) (other :tag "detect" undecided))
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:group 'mime-display)
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(defun mm-w3m-standalone-supports-m17n-p ()
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"Say whether the w3m command supports the m17n feature."
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(cond ((eq mm-w3m-standalone-supports-m17n-p t) t)
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((eq mm-w3m-standalone-supports-m17n-p nil) nil)
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((condition-case nil
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(let ((coding-system-for-write 'iso-2022-jp)
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(coding-system-for-read 'iso-2022-jp)
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(str (decode-coding-string "\
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\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)))
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(mm-with-multibyte-buffer
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(insert str)
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(call-process-region
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(point-min) (point-max) "w3m" t t nil "-dump"
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"-T" "text/html" "-I" "iso-2022-jp" "-O" "iso-2022-jp")
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(goto-char (point-min))
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(search-forward str nil t)))
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(error nil))
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(setq mm-w3m-standalone-supports-m17n-p t))
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(t
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;;(message "You had better upgrade your w3m command")
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(setq mm-w3m-standalone-supports-m17n-p nil))))
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(defun mm-inline-text-html-render-with-w3m-standalone (handle)
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"Render a text/html part using w3m."
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(if (mm-w3m-standalone-supports-m17n-p)
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(let ((source (mm-get-part handle))
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(charset (or (mail-content-type-get (mm-handle-type handle)
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'charset)
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(symbol-name mail-parse-charset)))
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cs)
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(if (and charset
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(setq cs (mm-charset-to-coding-system charset nil t))
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(not (eq cs 'ascii)))
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(setq charset (format "%s" (mm-coding-system-to-mime-charset cs)))
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;; The default.
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(setq charset "iso-8859-1"
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cs 'iso-8859-1))
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(mm-insert-inline
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handle
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(mm-with-unibyte-buffer
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(insert source)
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(mm-enable-multibyte)
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(let ((coding-system-for-write 'binary)
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(coding-system-for-read cs))
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(call-process-region
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(point-min) (point-max)
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"w3m" t t nil "-dump" "-T" "text/html"
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"-I" charset "-O" charset))
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(buffer-string))))
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(mm-inline-render-with-stdin handle nil "w3m" "-dump" "-T" "text/html")))
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(defun mm-links-remove-leading-blank ()
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;; Delete the annoying three spaces preceding each line of links
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;; output.
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(goto-char (point-min))
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(while (re-search-forward "^ " nil t)
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(delete-region (match-beginning 0) (match-end 0))))
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(defun mm-inline-wash-with-file (post-func cmd &rest args)
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(let ((file (make-temp-file
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(expand-file-name "mm" mm-tmp-directory))))
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(let ((coding-system-for-write 'binary))
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(write-region (point-min) (point-max) file nil 'silent))
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(delete-region (point-min) (point-max))
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(unwind-protect
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(apply 'call-process cmd nil t nil (mapcar 'eval args))
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(delete-file file))
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(and post-func (funcall post-func))))
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(defun mm-inline-wash-with-stdin (post-func cmd &rest args)
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(let ((coding-system-for-write 'binary))
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(apply 'call-process-region (point-min) (point-max)
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cmd t t nil args))
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(and post-func (funcall post-func)))
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(defun mm-inline-render-with-file (handle post-func cmd &rest args)
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(let ((source (mm-get-part handle)))
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(mm-insert-inline
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handle
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(mm-with-unibyte-buffer
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(insert source)
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(apply 'mm-inline-wash-with-file post-func cmd args)
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(buffer-string)))))
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(defun mm-inline-render-with-stdin (handle post-func cmd &rest args)
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(let ((source (mm-get-part handle)))
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(mm-insert-inline
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handle
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(mm-with-unibyte-buffer
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(insert source)
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(apply 'mm-inline-wash-with-stdin post-func cmd args)
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(buffer-string)))))
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(defun mm-inline-render-with-function (handle func &rest args)
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(let ((source (mm-get-part handle))
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(charset (or (mail-content-type-get (mm-handle-type handle) 'charset)
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mail-parse-charset)))
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(mm-insert-inline
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handle
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(mm-with-multibyte-buffer
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(insert (if charset
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(mm-decode-string source charset)
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source))
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(apply func args)
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(buffer-string)))))
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(defun mm-inline-text-html (handle)
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(if (stringp (car handle))
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(mapcar 'mm-inline-text-html (cdr handle))
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(let* ((func mm-text-html-renderer)
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(entry (assq func mm-text-html-renderer-alist))
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(inhibit-read-only t))
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(if entry
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(setq func (cdr entry)))
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(cond
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((functionp func)
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(funcall func handle))
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(t
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(apply (car func) handle (cdr func)))))))
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(defun mm-inline-text-vcard (handle)
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(let ((inhibit-read-only t))
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(mm-insert-inline
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handle
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(concat "\n-- \n"
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(ignore-errors
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(if (fboundp 'vcard-pretty-print)
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(vcard-pretty-print (mm-get-part handle))
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(vcard-format-string
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(vcard-parse-string (mm-get-part handle)
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'vcard-standard-filter))))))))
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(defun mm-inline-text (handle)
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(let ((b (point))
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(type (mm-handle-media-subtype handle))
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(charset (mail-content-type-get
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(mm-handle-type handle) 'charset))
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(inhibit-read-only t))
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(if (or (eq charset 'gnus-decoded)
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;; This is probably not entirely correct, but
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;; makes rfc822 parts with embedded multiparts work.
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(eq mail-parse-charset 'gnus-decoded))
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(save-restriction
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(narrow-to-region (point) (point))
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(mm-insert-part handle)
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(goto-char (point-max)))
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(mm-display-inline-fontify handle))
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(when (and mm-fill-flowed
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(equal type "plain")
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(equal (cdr (assoc 'format (mm-handle-type handle)))
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"flowed"))
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(save-restriction
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(narrow-to-region b (point))
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(goto-char b)
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(fill-flowed nil (equal (cdr (assoc 'delsp (mm-handle-type handle)))
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"yes"))
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(goto-char (point-max))))
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(save-restriction
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(narrow-to-region b (point))
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(when (member type '("enriched" "richtext"))
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(set-text-properties (point-min) (point-max) nil)
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(ignore-errors
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(enriched-decode (point-min) (point-max))))
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(mm-handle-set-undisplayer
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handle
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`(lambda ()
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(let ((inhibit-read-only t))
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(delete-region ,(copy-marker (point-min) t)
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,(point-max-marker))))))))
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(defun mm-insert-inline (handle text)
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"Insert TEXT inline from HANDLE."
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(let ((b (point)))
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(insert text)
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(unless (bolp)
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(insert "\n"))
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(mm-handle-set-undisplayer
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handle
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`(lambda ()
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(let ((inhibit-read-only t))
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(delete-region ,(copy-marker b t)
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,(point-marker)))))))
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(defun mm-inline-audio (handle)
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(message "Not implemented"))
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(defun mm-view-message ()
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(mm-enable-multibyte)
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(let (handles)
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(let (gnus-article-mime-handles)
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;; Double decode problem may happen. See mm-inline-message.
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(run-hooks 'gnus-article-decode-hook)
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(gnus-article-prepare-display)
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(setq handles gnus-article-mime-handles))
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(when handles
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(setq gnus-article-mime-handles
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(mm-merge-handles gnus-article-mime-handles handles))))
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(fundamental-mode)
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(goto-char (point-min)))
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(defun mm-inline-message (handle)
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(let ((b (point))
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(bolp (bolp))
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(charset (mail-content-type-get
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(mm-handle-type handle) 'charset))
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gnus-displaying-mime handles)
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(when (and charset
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(stringp charset))
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(setq charset (intern (downcase charset)))
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(when (eq charset 'us-ascii)
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(setq charset nil)))
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(save-excursion
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(save-restriction
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(narrow-to-region b b)
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(mm-insert-part handle)
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(let (gnus-article-mime-handles
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;; disable prepare hook
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gnus-article-prepare-hook
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(gnus-newsgroup-charset
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(unless (eq charset 'gnus-decoded) ;; mm-uu might set it.
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(or charset gnus-newsgroup-charset))))
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(let ((gnus-original-article-buffer (mm-handle-buffer handle)))
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(run-hooks 'gnus-article-decode-hook))
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(gnus-article-prepare-display)
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(setq handles gnus-article-mime-handles))
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(goto-char (point-min))
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(unless bolp
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(insert "\n"))
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(goto-char (point-max))
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(unless (bolp)
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(insert "\n"))
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(insert "----------\n\n")
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(when handles
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(setq gnus-article-mime-handles
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(mm-merge-handles gnus-article-mime-handles handles)))
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(mm-handle-set-undisplayer
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handle
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`(lambda ()
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(let ((inhibit-read-only t))
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(delete-region ,(point-min-marker) ,(point-max-marker)))))))))
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;; Shut up byte-compiler.
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(defvar font-lock-mode-hook)
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(defun mm-display-inline-fontify (handle &optional mode)
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"Insert HANDLE inline fontifying with MODE.
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If MODE is not set, try to find mode automatically."
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(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
|
|
(mm-handle-filename handle)
|
|
t t)
|
|
(unless charset
|
|
(setq coding-system (mm-find-buffer-file-coding-system)))
|
|
(setq text (buffer-string))))
|
|
(with-temp-buffer
|
|
(buffer-disable-undo)
|
|
(mm-enable-multibyte)
|
|
(insert (cond ((eq charset 'gnus-decoded)
|
|
(with-current-buffer (mm-handle-buffer handle)
|
|
(buffer-string)))
|
|
(coding-system
|
|
(decode-coding-string text coding-system))
|
|
(charset
|
|
(mm-decode-string text charset))
|
|
(t
|
|
text)))
|
|
(require 'font-lock)
|
|
;; I find font-lock a bit too verbose.
|
|
(let ((font-lock-verbose nil)
|
|
(font-lock-support-mode nil)
|
|
(enable-local-variables nil))
|
|
;; Disable support modes, e.g., jit-lock, lazy-lock, etc.
|
|
;; Note: XEmacs people use `font-lock-mode-hook' to run those modes.
|
|
(set (make-local-variable 'font-lock-mode-hook) nil)
|
|
(setq buffer-file-name (mm-handle-filename handle))
|
|
(with-demoted-errors
|
|
(if mode
|
|
(save-window-excursion
|
|
(switch-to-buffer (current-buffer))
|
|
(funcall mode))
|
|
(let ((auto-mode-alist
|
|
(delq (rassq 'doc-view-mode-maybe auto-mode-alist)
|
|
(copy-sequence auto-mode-alist))))
|
|
(set-auto-mode)))
|
|
;; The mode function might have already turned on font-lock.
|
|
;; Do not fontify if the guess mode is fundamental.
|
|
(unless (or font-lock-mode
|
|
(eq major-mode 'fundamental-mode))
|
|
(font-lock-ensure))))
|
|
(setq text (buffer-string))
|
|
;; Set buffer unmodified to avoid confirmation when killing the
|
|
;; buffer.
|
|
(set-buffer-modified-p nil))
|
|
(mm-insert-inline handle text)))
|
|
|
|
;; Shouldn't these functions check whether the user even wants to use
|
|
;; font-lock? 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))
|
|
|
|
(defun mm-display-org-inline (handle)
|
|
"Show an Org mode text from HANDLE inline."
|
|
(mm-display-inline-fontify handle 'org-mode))
|
|
|
|
(defun mm-display-shell-script-inline (handle)
|
|
"Show a shell script from HANDLE inline."
|
|
(mm-display-inline-fontify handle 'shell-script-mode))
|
|
|
|
(defun mm-display-javascript-inline (handle)
|
|
"Show JavsScript code from HANDLE inline."
|
|
(mm-display-inline-fontify handle 'javascript-mode))
|
|
|
|
;; id-signedData OBJECT IDENTIFIER ::= { iso(1) member-body(2)
|
|
;; us(840) rsadsi(113549) pkcs(1) pkcs7(7) 2 }
|
|
(defvar mm-pkcs7-signed-magic
|
|
(concat
|
|
"0"
|
|
"\\(\\(\x80\\)"
|
|
"\\|\\(\x81\\(.\\|\n\\)\\{1\\}\\)"
|
|
"\\|\\(\x82\\(.\\|\n\\)\\{2\\}\\)"
|
|
"\\|\\(\x83\\(.\\|\n\\)\\{3\\}\\)"
|
|
"\\)"
|
|
"\x06\x09\\*\x86H\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
|
|
(concat
|
|
"0"
|
|
"\\(\\(\x80\\)"
|
|
"\\|\\(\x81\\(.\\|\n\\)\\{1\\}\\)"
|
|
"\\|\\(\x82\\(.\\|\n\\)\\{2\\}\\)"
|
|
"\\|\\(\x83\\(.\\|\n\\)\\{3\\}\\)"
|
|
"\\)"
|
|
"\x06\x09\\*\x86H\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 &optional from)
|
|
(case (mm-view-pkcs7-get-type handle)
|
|
(enveloped (mm-view-pkcs7-decrypt handle from))
|
|
(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)
|
|
|
|
(autoload 'epg-decrypt-string "epg")
|
|
|
|
(defun mm-view-pkcs7-decrypt (handle &optional from)
|
|
(insert-buffer-substring (mm-handle-buffer handle))
|
|
(goto-char (point-min))
|
|
(if (eq mml-smime-use 'epg)
|
|
;; Use EPG/gpgsm
|
|
(let ((part (base64-decode-string (buffer-string))))
|
|
(erase-buffer)
|
|
(insert (epg-decrypt-string (epg-make-context 'CMS) part)))
|
|
;; Use openssl
|
|
(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
|
|
"Decipher using key"
|
|
smime-keys nil nil nil (car-safe (car-safe smime-keys)))))
|
|
from))
|
|
(goto-char (point-min))
|
|
(while (search-forward "\r\n" nil t)
|
|
(replace-match "\n"))
|
|
(goto-char (point-min)))
|
|
|
|
(provide 'mm-view)
|
|
|
|
;;; mm-view.el ends here
|