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[Emacs-diffs] Changes to pmailmm.el
From: |
Paul Michael Reilly |
Subject: |
[Emacs-diffs] Changes to pmailmm.el |
Date: |
Mon, 18 Aug 2008 04:51:30 +0000 |
CVSROOT: /cvsroot/emacs
Module name: emacs
Changes by: Paul Michael Reilly <pmr> 08/08/18 04:51:29
Index: pmailmm.el
===================================================================
RCS file: pmailmm.el
diff -N pmailmm.el
--- /dev/null 1 Jan 1970 00:00:00 -0000
+++ pmailmm.el 18 Aug 2008 04:51:28 -0000 1.1
@@ -0,0 +1,401 @@
+;;; pmailmm.el --- MIME decoding and display stuff for PMAIL
+
+;; Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc.
+
+;; Maintainer: FSF
+;; Keywords: mail
+
+;; 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:
+
+;; Essentially based on the design of Alexander Pohoyda's MIME
+;; extensions (mime-display.el and mime.el). To use, copy a complete
+;; message into a new buffer and call (mime-show t).
+
+;; To use:
+
+;; (autoload 'pmail-mime "pmailmm"
+;; "Show MIME message." t)
+;; (add-hook 'pmail-mode-hook
+;; (lambda ()
+;; (define-key pmail-mode-map (kbd "v")
+;; 'pmail-mime)))
+
+;;; Code:
+
+;;; Variables
+
+(defcustom pmail-mime-media-type-handlers-alist
+ '(("multipart/.*" pmail-mime-multipart-handler)
+ ("text/.*" pmail-mime-text-handler)
+ ("text/\\(x-\\)?patch" pmail-mime-bulk-handler)
+ ("application/pgp-signature" pmail-mime-application/pgp-signature-handler)
+ ("\\(image\\|audio\\|video\\|application\\)/.*" pmail-mime-bulk-handler))
+ "Alist of media type handlers, also known as agents.
+Every handler is a list of type (string symbol) where STRING is a
+regular expression to match the media type with and SYMBOL is a
+function to run. Handlers should return a non-nil value if the
+job is done."
+ :type 'list
+ :group 'mime)
+
+(defcustom pmail-mime-attachment-dirs-alist
+ '(("text/.*" "~/Documents")
+ ("image/.*" "~/Pictures")
+ (".*" "~/Desktop" "~" "/tmp"))
+ "Default directories to save attachments into.
+Each media type may have it's own list of directories in order of
+preference. The first existing directory in the list will be
+used."
+ :type 'list
+ :group 'mime)
+
+(defvar pmail-mime-total-number-of-bulk-attachments 0
+ "A total number of attached bulk bodyparts in the message. If more than 3,
+offer a way to save all attachments at once.")
+(put 'pmail-mime-total-number-of-bulk-attachments 'permanent-local t)
+
+;;; Buttons
+
+(defun pmail-mime-save (button)
+ "Save the attachment using info in the BUTTON."
+ (let* ((filename (button-get button 'filename))
+ (directory (button-get button 'directory))
+ (data (button-get button 'data)))
+ (while (file-exists-p (expand-file-name filename directory))
+ (let* ((f (file-name-sans-extension filename))
+ (i 1))
+ (when (string-match "-\\([0-9]+\\)$" f)
+ (setq i (1+ (string-to-number (match-string 1 f)))
+ f (substring f 0 (match-beginning 0))))
+ (setq filename (concat f "-" (number-to-string i) "."
+ (file-name-extension filename)))))
+ (setq filename (expand-file-name
+ (read-file-name (format "Save as (default: %s): " filename)
+ directory
+ (expand-file-name filename directory))
+ directory))
+ (when (file-regular-p filename)
+ (error (message "File `%s' already exists" filename)))
+ (with-temp-file filename
+ (set-buffer-file-coding-system 'no-conversion)
+ (insert data))))
+
+(define-button-type 'pmail-mime-save
+ 'action 'pmail-mime-save)
+
+;;; Handlers
+
+(defun pmail-mime-text-handler (content-type
+ content-disposition
+ content-transfer-encoding)
+ "Handle the current buffer as a plain text MIME part."
+ (let* ((charset (cdr (assq 'charset (cdr content-type))))
+ (coding-system (when charset
+ (intern (downcase charset)))))
+ (when (coding-system-p coding-system)
+ (decode-coding-region (point-min) (point-max) coding-system))))
+
+(defun test-pmail-mime-handler ()
+ "Test of a mail using no MIME parts at all."
+ (let ((mail "To: address@hidden
+Content-Type: text/plain; charset=koi8-r
+Content-Transfer-Encoding: 8bit
+MIME-Version: 1.0
+
+\372\304\322\301\327\323\324\327\325\312\324\305\41"))
+ (switch-to-buffer (get-buffer-create "*test*"))
+ (erase-buffer)
+ (set-buffer-multibyte nil)
+ (insert mail)
+ (pmail-mime-show t)
+ (set-buffer-multibyte t)))
+
+(defun pmail-mime-bulk-handler (content-type
+ content-disposition
+ content-transfer-encoding)
+ "Handle the current buffer as an attachment to download."
+ (setq pmail-mime-total-number-of-bulk-attachments
+ (1+ pmail-mime-total-number-of-bulk-attachments))
+ ;; Find the default directory for this media type
+ (let* ((directory (catch 'directory
+ (dolist (entry pmail-mime-attachment-dirs-alist)
+ (when (string-match (car entry) (car content-type))
+ (dolist (dir (cdr entry))
+ (when (file-directory-p dir)
+ (throw 'directory dir)))))))
+ (filename (or (cdr (assq 'name (cdr content-type)))
+ (cdr (assq 'filename (cdr content-disposition)))
+ "noname"))
+ (label (format "\nAttached %s file: " (car content-type)))
+ (data (buffer-string)))
+ (delete-region (point-min) (point-max))
+ (insert label)
+ (insert-button filename
+ :type 'pmail-mime-save
+ 'filename filename
+ 'directory directory
+ 'data data)))
+
+(defun test-pmail-mime-bulk-handler ()
+ "Test of a mail used as an example in RFC 2183."
+ (let ((mail "Content-Type: image/jpeg
+Content-Disposition: attachment; filename=genome.jpeg;
+ modification-date=\"Wed, 12 Feb 1997 16:29:51 -0500\";
+Content-Description: a complete map of the human genome
+Content-Transfer-Encoding: base64
+
+iVBORw0KGgoAAAANSUhEUgAAADAAAAAwCAMAAABg3Am1AAAABGdBTUEAALGPC/xhBQAAAAZQ
+TFRF////AAAAVcLTfgAAAPZJREFUeNq9ldsOwzAIQ+3//+l1WlvA5ZLsoUiTto4TB+ISoAjy
++ITfRBfcAmgRFFeAm+J6uhdKdFhFWUgDkFsK0oUp/9G2//Kj7Jx+5tSKOdBscgUYiKHRS/me
+WATQdRUvAK0Bnmshmtn79PpaLBbbOZkjKvRnjRZoRswOkG1wFchKew2g9wXVJVZL/m4+B+vv
+9AxQQR2Q33SgAYJzzVACdAWjAfRYzYFO9n6SLnydtQHSMxYDMAKqZ/8FS/lTK+zuq3CtK64L
+UDwbgUEAUmk2Zyg101d6PhCDySgAvTvDgKiuOrc4dLxUb7UMnhGIexyI+d6U+ABuNAP4Simx
+lgAAAABJRU5ErkJggg==
+"))
+ (switch-to-buffer (get-buffer-create "*test*"))
+ (erase-buffer)
+ (insert mail)
+ (pmail-mime-show)))
+
+(defun pmail-mime-multipart-handler (content-type
+ content-disposition
+ content-transfer-encoding)
+ "Handle the current buffer as a multipart MIME body.
+The current buffer should be narrowed to the body. CONTENT-TYPE,
+CONTENT-DISPOSITION, and CONTENT-TRANSFER-ENCODING are the values
+of the respective parsed headers. See `pmail-mime-handle' for their
+format."
+ ;; Some MUAs start boundaries with "--", while it should start
+ ;; with "CRLF--", as defined by RFC 2046:
+ ;; The boundary delimiter MUST occur at the beginning of a line,
+ ;; i.e., following a CRLF, and the initial CRLF is considered to
+ ;; be attached to the boundary delimiter line rather than part
+ ;; of the preceding part.
+ ;; We currently don't handle that.
+ (let ((boundary (cdr (assq 'boundary content-type)))
+ beg next)
+ (unless boundary
+ (error "No boundary defined" content-type content-disposition
+ content-transfer-encoding))
+ (setq boundary (concat "\n--" boundary))
+ ;; Hide the body before the first bodypart
+ (goto-char (point-min))
+ (when (and (search-forward boundary nil t)
+ (looking-at "[ \t]*\n"))
+ (delete-region (point-min) (match-end 0)))
+ ;; Reset the counter
+ (setq pmail-mime-total-number-of-bulk-attachments 0)
+ ;; Loop over all body parts, where beg points at the beginning of
+ ;; the part and end points at the end of the part. next points at
+ ;; the beginning of the next part.
+ (setq beg (point-min))
+ (while (search-forward boundary nil t)
+ (setq end (match-beginning 0))
+ ;; If this is the last boundary according to RFC 2046, hide the
+ ;; epilogue, else hide the boundary only. Use a marker for
+ ;; `next' because `pmail-mime-show' may change the buffer.
+ (cond ((looking-at "--[ \t]*\n")
+ (setq next (point-max-marker)))
+ ((looking-at "[ \t]*\n")
+ (setq next (copy-marker (match-end 0))))
+ (t
+ (error "Malformed boundary" content-type
+ content-disposition content-transfer-encoding)))
+ (delete-region end next)
+ ;; Handle the part.
+ (save-match-data
+ (save-excursion
+ (save-restriction
+ (narrow-to-region beg end)
+ (pmail-mime-show))))
+ (setq beg next)
+ (goto-char beg))))
+
+(defun test-pmail-mime-multipart-handler ()
+ "Test of a mail used as an example in RFC 2046."
+ (let ((mail "From: Nathaniel Borenstein <address@hidden>
+To: Ned Freed <address@hidden>
+Date: Sun, 21 Mar 1993 23:56:48 -0800 (PST)
+Subject: Sample message
+MIME-Version: 1.0
+Content-type: multipart/mixed; boundary=\"simple boundary\"
+
+This is the preamble. It is to be ignored, though it
+is a handy place for composition agents to include an
+explanatory note to non-MIME conformant readers.
+
+--simple boundary
+
+This is implicitly typed plain US-ASCII text.
+It does NOT end with a linebreak.
+--simple boundary
+Content-type: text/plain; charset=us-ascii
+
+This is explicitly typed plain US-ASCII text.
+It DOES end with a linebreak.
+
+--simple boundary--
+
+This is the epilogue. It is also to be ignored."))
+ (switch-to-buffer (get-buffer-create "*test*"))
+ (erase-buffer)
+ (insert mail)
+ (pmail-mime-show t)))
+
+;;; Main code
+
+(defun pmail-mime-handle (content-type
+ content-disposition
+ content-transfer-encoding)
+ "Handle the current buffer as a MIME part.
+The current buffer should be narrowed to the respective body, and
+point should be at the beginning of the body.
+
+CONTENT-TYPE, CONTENT-DISPOSITION, and CONTENT-TRANSFER-ENCODING
+are the values of the respective parsed headers. The parsed
+headers for CONTENT-TYPE and CONTENT-DISPOSITION have the form
+
+ \(VALUE . ALIST)
+
+In other words:
+
+ \(VALUE (ATTRIBUTE . VALUE) (ATTRIBUTE . VALUE) ...)
+
+VALUE is a string and ATTRIBUTE is a symbol.
+
+Consider the following header, for example:
+
+Content-Type: multipart/mixed;
+ boundary=\"----=_NextPart_000_0104_01C617E4.BDEC4C40\"
+
+The parsed header value:
+
+\(\"multipart/mixed\"
+ \(\"boundary\" . \"----=_NextPart_000_0104_01C617E4.BDEC4C40\"))"
+ ;; Handle the content transfer encodings we know. Unknown transfer
+ ;; encodings will be passed on to the various handlers.
+ (cond ((string= content-transfer-encoding "base64")
+ (when (ignore-errors
+ (base64-decode-region (point) (point-max)))
+ (setq content-transfer-encoding nil)))
+ ((string= content-transfer-encoding "quoted-printable")
+ (quoted-printable-decode-region (point) (point-max))
+ (setq content-transfer-encoding nil))
+ ((string= content-transfer-encoding "8bit")
+ ;; FIXME: Is this the correct way?
+ (set-buffer-multibyte nil)))
+ ;; Inline stuff requires work. Attachments are handled by the bulk
+ ;; handler.
+ (if (string= "inline" (car content-disposition))
+ (let ((stop nil))
+ (dolist (entry pmail-mime-media-type-handlers-alist)
+ (when (and (string-match (car entry) (car content-type)) (not stop))
+ (progn
+ (setq stop (funcall (cadr entry) content-type
+ content-disposition
+ content-transfer-encoding))))))
+ ;; Everything else is an attachment.
+ (pmail-mime-bulk-handler content-type
+ content-disposition
+ content-transfer-encoding)))
+
+(defun pmail-mime-show (&optional show-headers)
+ "Handle the current buffer as a MIME message.
+If SHOW-HEADERS is non-nil, then the headers of the current part
+will shown as usual for a MIME message. The headers are also
+shown for the content type message/rfc822. This function will be
+called recursively if multiple parts are available.
+
+The current buffer must contain a single message. It will be
+modified."
+ (let ((end (point-min))
+ content-type
+ content-transfer-encoding
+ content-disposition)
+ ;; `point-min' returns the beginning and `end' points at the end
+ ;; of the headers. We're not using `pmail-header-get-header'
+ ;; because we must be able to handle the case of no headers
+ ;; existing in a part. In this case end is at point-min.
+ (goto-char (point-min))
+ ;; If we're showing a part without headers, then it will start
+ ;; with a newline.
+ (if (eq (char-after) ?\n)
+ (setq end (1+ (point)))
+ (when (search-forward "\n\n" nil t)
+ (setq end (match-end 0))
+ (save-restriction
+ (narrow-to-region (point-min) end)
+ ;; FIXME: Default disposition of the multipart entities should
+ ;; be inherited.
+ (setq content-type
+ (mail-fetch-field "Content-Type")
+ content-transfer-encoding
+ (mail-fetch-field "Content-Transfer-Encoding")
+ content-disposition
+ (mail-fetch-field "Content-Disposition")))))
+ (if content-type
+ (setq content-type (mail-header-parse-content-type
+ content-type))
+ ;; FIXME: Default "message/rfc822" in a "multipart/digest"
+ ;; according to RFC 2046.
+ (setq content-type '("text/plain")))
+ (setq content-disposition
+ (if content-disposition
+ (mail-header-parse-content-disposition content-disposition)
+ ;; If none specified, we are free to choose what we deem
+ ;; suitable according to RFC 2183. We like inline.
+ '("inline")))
+ ;; Unrecognized disposition types are to be treated like
+ ;; attachment according to RFC 2183.
+ (unless (member (car content-disposition) '("inline" "attachment"))
+ (setq content-disposition '("attachment")))
+ ;; Hide headers and handle the part.
+ (save-restriction
+ (cond ((string= (car content-type) "message/rfc822")
+ (pmail-header-hide-headers)
+ (narrow-to-region end (point-max)))
+ (show-headers
+ (pmail-header-hide-headers))
+ (t
+ (delete-region (point-min) end)))
+ (pmail-mime-handle content-type content-disposition
+ content-transfer-encoding))))
+
+(defun pmail-mime ()
+ "Copy buffer contents to a temporary buffer and handle MIME.
+This calls `pmail-mime-show' to do the real job."
+ (interactive)
+ (let ((data (with-current-buffer pmail-buffer
+ (save-restriction
+ (widen)
+ (buffer-substring
+ (pmail-desc-get-start pmail-current-message)
+ (pmail-desc-get-end pmail-current-message)))))
+ (buf (get-buffer-create "*PMAIL*")))
+ (set-buffer buf)
+ (let ((inhibit-read-only t))
+ (erase-buffer)
+ (insert data)
+ (pmail-mime-show t))
+ (view-buffer buf)))
+
+(provide 'pmailmm)
+
+;; pmailmm.el ends here
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Paul Michael Reilly <=