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emacs/lisp/gnus/mm-uu.el
Glenn Morris 5a9dffec38 Switch license to GPLv3 or later.
2007-07-25 04:24:43 +00:00

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;;; mm-uu.el --- Return uu stuff as mm handles
;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
;; 2005, 2006, 2007 Free Software Foundation, Inc.
;; Author: Shenghuo Zhu <zsh@cs.rochester.edu>
;; Keywords: postscript uudecode binhex shar forward gnatsweb pgp
;; 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, 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 'nnheader)
(require 'mm-decode)
(require 'mailcap)
(require 'mml2015)
(autoload 'uudecode-decode-region "uudecode")
(autoload 'uudecode-decode-region-external "uudecode")
(autoload 'uudecode-decode-region-internal "uudecode")
(autoload 'binhex-decode-region "binhex")
(autoload 'binhex-decode-region-external "binhex")
(autoload 'binhex-decode-region-internal "binhex")
(autoload 'yenc-decode-region "yenc")
(autoload 'yenc-extract-filename "yenc")
(defcustom mm-uu-decode-function 'uudecode-decode-region
"*Function to uudecode.
Internal function is done in Lisp by default, therefore decoding may
appear to be horribly slow. You can make Gnus use an external
decoder, such as uudecode."
:type '(choice
(function-item :tag "Auto detect" uudecode-decode-region)
(function-item :tag "Internal" uudecode-decode-region-internal)
(function-item :tag "External" uudecode-decode-region-external))
:group 'gnus-article-mime)
(defcustom mm-uu-binhex-decode-function 'binhex-decode-region
"*Function to binhex decode.
Internal function is done in elisp by default, therefore decoding may
appear to be horribly slow . You can make Gnus use the external Unix
decoder, such as hexbin."
:type '(choice (function-item :tag "Auto detect" binhex-decode-region)
(function-item :tag "Internal" binhex-decode-region-internal)
(function-item :tag "External" binhex-decode-region-external))
:group 'gnus-article-mime)
(defvar mm-uu-yenc-decode-function 'yenc-decode-region)
(defvar mm-uu-pgp-beginning-signature
"^-----BEGIN PGP SIGNATURE-----")
(defvar mm-uu-beginning-regexp nil)
(defvar mm-dissect-disposition "inline"
"The default disposition of uu parts.
This can be either \"inline\" or \"attachment\".")
(defcustom mm-uu-emacs-sources-regexp "\\.emacs\\.sources"
"The regexp of Emacs sources groups."
:version "22.1"
:type 'regexp
:group 'gnus-article-mime)
(defcustom mm-uu-diff-groups-regexp
"\\(gmane\\|gnu\\)\\..*\\(diff\\|commit\\|cvs\\|bug\\|devel\\)"
"Regexp matching diff groups."
:version "22.1"
:type 'regexp
:group 'gnus-article-mime)
(defvar mm-uu-type-alist
'((postscript
"^%!PS-"
"^%%EOF$"
mm-uu-postscript-extract
nil)
(uu
"^begin[ \t]+0?[0-7][0-7][0-7][ \t]+"
"^end[ \t]*$"
mm-uu-uu-extract
mm-uu-uu-filename)
(binhex
"^:...............................................................$"
":$"
mm-uu-binhex-extract
nil
mm-uu-binhex-filename)
(yenc
"^=ybegin.*size=[0-9]+.*name=.*$"
"^=yend.*size=[0-9]+"
mm-uu-yenc-extract
mm-uu-yenc-filename)
(shar
"^#! */bin/sh"
"^exit 0$"
mm-uu-shar-extract)
(forward
;; Thanks to Edward J. Sabol <sabol@alderaan.gsfc.nasa.gov> and
;; Peter von der Ah\'e <pahe@daimi.au.dk>
"^-+ \\(Start of \\)?Forwarded message"
"^-+ End \\(of \\)?forwarded message"
mm-uu-forward-extract
nil
mm-uu-forward-test)
(gnatsweb
"^----gnatsweb-attachment----"
nil
mm-uu-gnatsweb-extract)
(pgp-signed
"^-----BEGIN PGP SIGNED MESSAGE-----"
"^-----END PGP SIGNATURE-----"
mm-uu-pgp-signed-extract
nil
nil)
(pgp-encrypted
"^-----BEGIN PGP MESSAGE-----"
"^-----END PGP MESSAGE-----"
mm-uu-pgp-encrypted-extract
nil
nil)
(pgp-key
"^-----BEGIN PGP PUBLIC KEY BLOCK-----"
"^-----END PGP PUBLIC KEY BLOCK-----"
mm-uu-pgp-key-extract
mm-uu-gpg-key-skip-to-last
nil)
(emacs-sources
"^;;;?[ \t]*[^ \t]+\\.el[ \t]*--"
"^;;;?[ \t]*\\([^ \t]+\\.el\\)[ \t]+ends here"
mm-uu-emacs-sources-extract
nil
mm-uu-emacs-sources-test)
(diff
"^Index: "
nil
mm-uu-diff-extract
nil
mm-uu-diff-test))
"A list of specifications for non-MIME attachments.
Each element consist of the following entries: label,
start-regexp, end-regexp, extract-function, test-function.
After modifying this list you must run \\[mm-uu-configure].
You can disable elements from this list by customizing
`mm-uu-configure-list'.")
(defcustom mm-uu-configure-list '((shar . disabled))
"A list of mm-uu configuration.
To disable dissecting shar codes, for instance, add
`(shar . disabled)' to this list."
:type 'alist
:options (mapcar (lambda (entry)
(list (car entry) '(const disabled)))
mm-uu-type-alist)
:group 'gnus-article-mime)
(defvar mm-uu-text-plain-type '("text/plain" (charset . gnus-decoded))
"MIME type and parameters for text/plain parts.
`gnus-decoded' is a fake charset, which means no further decoding.")
;; functions
(defsubst mm-uu-type (entry)
(car entry))
(defsubst mm-uu-beginning-regexp (entry)
(nth 1 entry))
(defsubst mm-uu-end-regexp (entry)
(nth 2 entry))
(defsubst mm-uu-function-extract (entry)
(nth 3 entry))
(defsubst mm-uu-function-1 (entry)
(nth 4 entry))
(defsubst mm-uu-function-2 (entry)
(nth 5 entry))
(defun mm-uu-copy-to-buffer (&optional from to)
"Copy the contents of the current buffer to a fresh buffer.
Return that buffer."
(let ((obuf (current-buffer))
(coding-system
;; Might not exist in non-MULE XEmacs
(when (boundp 'buffer-file-coding-system)
buffer-file-coding-system)))
(with-current-buffer (generate-new-buffer " *mm-uu*")
(setq buffer-file-coding-system coding-system)
(insert-buffer-substring obuf from to)
(current-buffer))))
(defun mm-uu-configure-p (key val)
(member (cons key val) mm-uu-configure-list))
(defun mm-uu-configure (&optional symbol value)
"Configure detection of non-MIME attachments."
(interactive)
(if symbol (set-default symbol value))
(setq mm-uu-beginning-regexp nil)
(mapcar (lambda (entry)
(if (mm-uu-configure-p (mm-uu-type entry) 'disabled)
nil
(setq mm-uu-beginning-regexp
(concat mm-uu-beginning-regexp
(if mm-uu-beginning-regexp "\\|")
(mm-uu-beginning-regexp entry)))))
mm-uu-type-alist))
(mm-uu-configure)
(eval-when-compile
(defvar file-name)
(defvar start-point)
(defvar end-point)
(defvar entry))
(defun mm-uu-uu-filename ()
(if (looking-at ".+")
(setq file-name
(let ((nnheader-file-name-translation-alist
'((?/ . ?,) (?\ . ?_) (?* . ?_) (?$ . ?_))))
(nnheader-translate-file-chars (match-string 0))))))
(defun mm-uu-binhex-filename ()
(setq file-name
(ignore-errors
(binhex-decode-region start-point end-point t))))
(defun mm-uu-yenc-filename ()
(goto-char start-point)
(setq file-name
(ignore-errors
(yenc-extract-filename))))
(defun mm-uu-forward-test ()
(save-excursion
(goto-char start-point)
(forward-line)
(looking-at "[\r\n]*[a-zA-Z][a-zA-Z0-9-]*:")))
(defun mm-uu-postscript-extract ()
(mm-make-handle (mm-uu-copy-to-buffer start-point end-point)
'("application/postscript")))
(defun mm-uu-emacs-sources-extract ()
(mm-make-handle (mm-uu-copy-to-buffer start-point end-point)
'("application/emacs-lisp" (charset . gnus-decoded))
nil nil
(list mm-dissect-disposition
(cons 'filename file-name))))
(eval-when-compile
(defvar gnus-newsgroup-name))
(defun mm-uu-emacs-sources-test ()
(setq file-name (match-string 1))
(and gnus-newsgroup-name
mm-uu-emacs-sources-regexp
(string-match mm-uu-emacs-sources-regexp gnus-newsgroup-name)))
(defun mm-uu-diff-extract ()
(mm-make-handle (mm-uu-copy-to-buffer start-point end-point)
'("text/x-patch" (charset . gnus-decoded))))
(defun mm-uu-diff-test ()
(and gnus-newsgroup-name
mm-uu-diff-groups-regexp
(string-match mm-uu-diff-groups-regexp gnus-newsgroup-name)))
(defun mm-uu-forward-extract ()
(mm-make-handle (mm-uu-copy-to-buffer
(progn (goto-char start-point) (forward-line) (point))
(progn (goto-char end-point) (forward-line -1) (point)))
'("message/rfc822" (charset . gnus-decoded))))
(defun mm-uu-uu-extract ()
(mm-make-handle (mm-uu-copy-to-buffer start-point end-point)
(list (or (and file-name
(string-match "\\.[^\\.]+$"
file-name)
(mailcap-extension-to-mime
(match-string 0 file-name)))
"application/octet-stream"))
'x-uuencode nil
(if (and file-name (not (equal file-name "")))
(list mm-dissect-disposition
(cons 'filename file-name)))))
(defun mm-uu-binhex-extract ()
(mm-make-handle (mm-uu-copy-to-buffer start-point end-point)
(list (or (and file-name
(string-match "\\.[^\\.]+$" file-name)
(mailcap-extension-to-mime
(match-string 0 file-name)))
"application/octet-stream"))
'x-binhex nil
(if (and file-name (not (equal file-name "")))
(list mm-dissect-disposition
(cons 'filename file-name)))))
(defun mm-uu-yenc-extract ()
(mm-make-handle (mm-uu-copy-to-buffer start-point end-point)
(list (or (and file-name
(string-match "\\.[^\\.]+$" file-name)
(mailcap-extension-to-mime
(match-string 0 file-name)))
"application/octet-stream"))
'x-yenc nil
(if (and file-name (not (equal file-name "")))
(list mm-dissect-disposition
(cons 'filename file-name)))))
(defun mm-uu-shar-extract ()
(mm-make-handle (mm-uu-copy-to-buffer start-point end-point)
'("application/x-shar")))
(defun mm-uu-gnatsweb-extract ()
(save-restriction
(goto-char start-point)
(forward-line)
(narrow-to-region (point) end-point)
(mm-dissect-buffer t)))
(defun mm-uu-pgp-signed-test (&rest rest)
(and
mml2015-use
(mml2015-clear-verify-function)
(cond
((eq mm-verify-option 'never) nil)
((eq mm-verify-option 'always) t)
((eq mm-verify-option 'known) t)
(t (prog1
(y-or-n-p "Verify pgp signed part? ")
(message ""))))))
(eval-when-compile
(defvar gnus-newsgroup-charset))
(defun mm-uu-pgp-signed-extract-1 (handles ctl)
(let ((buf (mm-uu-copy-to-buffer (point-min) (point-max))))
(with-current-buffer buf
(if (mm-uu-pgp-signed-test)
(progn
(mml2015-clean-buffer)
(let ((coding-system-for-write (or gnus-newsgroup-charset
'iso-8859-1)))
(funcall (mml2015-clear-verify-function))))
(when (and mml2015-use (null (mml2015-clear-verify-function)))
(mm-set-handle-multipart-parameter
mm-security-handle 'gnus-details
(format "Clear verification not supported by `%s'.\n" mml2015-use))))
(goto-char (point-min))
(forward-line)
;; We need to be careful not to strip beyond the armor headers.
;; Previously, an attacker could replace the text inside our
;; markup with trailing garbage by injecting whitespace into the
;; message.
(while (looking-at "Hash:") ; The only header allowed in cleartext
(forward-line)) ; signatures according to RFC2440.
(when (looking-at "[\t ]*$")
(forward-line))
(delete-region (point-min) (point))
(if (re-search-forward mm-uu-pgp-beginning-signature nil t)
(delete-region (match-beginning 0) (point-max)))
(goto-char (point-min))
(while (re-search-forward "^- " nil t)
(replace-match "" t t)
(forward-line 1)))
(list (mm-make-handle buf mm-uu-text-plain-type))))
(defun mm-uu-pgp-signed-extract ()
(let ((mm-security-handle (list (format "multipart/signed"))))
(mm-set-handle-multipart-parameter
mm-security-handle 'protocol "application/x-gnus-pgp-signature")
(save-restriction
(narrow-to-region start-point end-point)
(add-text-properties 0 (length (car mm-security-handle))
(list 'buffer (mm-uu-copy-to-buffer))
(car mm-security-handle))
(setcdr mm-security-handle
(mm-uu-pgp-signed-extract-1 nil
mm-security-handle)))
mm-security-handle))
(defun mm-uu-pgp-encrypted-test (&rest rest)
(and
mml2015-use
(mml2015-clear-decrypt-function)
(cond
((eq mm-decrypt-option 'never) nil)
((eq mm-decrypt-option 'always) t)
((eq mm-decrypt-option 'known) t)
(t (prog1
(y-or-n-p "Decrypt pgp encrypted part? ")
(message ""))))))
(defun mm-uu-pgp-encrypted-extract-1 (handles ctl)
(let ((buf (mm-uu-copy-to-buffer (point-min) (point-max)))
(first t)
charset)
;; Make sure there's a blank line between header and body.
(with-current-buffer buf
(goto-char (point-min))
(while (prog2
(forward-line 1)
(if first
(looking-at "[^\t\n ]+:")
(looking-at "[^\t\n ]+:\\|[\t ]"))
(setq first nil)))
(unless (memq (char-after) '(?\n nil))
(insert "\n"))
(save-restriction
(narrow-to-region (point-min) (point))
(setq charset (mail-fetch-field "charset")))
(if (and (mm-uu-pgp-encrypted-test)
(progn
(mml2015-clean-buffer)
(funcall (mml2015-clear-decrypt-function))
(equal (mm-handle-multipart-ctl-parameter mm-security-handle
'gnus-info)
"OK")))
(progn
;; Decode charset.
(if (and (or charset
(setq charset gnus-newsgroup-charset))
(setq charset (mm-charset-to-coding-system charset))
(not (eq charset 'ascii)))
;; Assume that buffer's multibyteness is turned off.
;; See `mml2015-pgg-clear-decrypt'.
(insert (mm-decode-coding-string (prog1
(buffer-string)
(erase-buffer)
(mm-enable-multibyte))
charset))
(mm-enable-multibyte))
(list (mm-make-handle buf mm-uu-text-plain-type)))
(list (mm-make-handle buf '("application/pgp-encrypted")))))))
(defun mm-uu-pgp-encrypted-extract ()
(let ((mm-security-handle (list (format "multipart/encrypted"))))
(mm-set-handle-multipart-parameter
mm-security-handle 'protocol "application/x-gnus-pgp-encrypted")
(save-restriction
(narrow-to-region start-point end-point)
(add-text-properties 0 (length (car mm-security-handle))
(list 'buffer (mm-uu-copy-to-buffer))
(car mm-security-handle))
(setcdr mm-security-handle
(mm-uu-pgp-encrypted-extract-1 nil
mm-security-handle)))
mm-security-handle))
(defun mm-uu-gpg-key-skip-to-last ()
(let ((point (point))
(end-regexp (mm-uu-end-regexp entry))
(beginning-regexp (mm-uu-beginning-regexp entry)))
(when (and end-regexp
(not (mm-uu-configure-p (mm-uu-type entry) 'disabled)))
(while (re-search-forward end-regexp nil t)
(skip-chars-forward " \t\n\r")
(if (looking-at beginning-regexp)
(setq point (match-end 0)))))
(goto-char point)))
(defun mm-uu-pgp-key-extract ()
(let ((buf (mm-uu-copy-to-buffer start-point end-point)))
(mm-make-handle buf
'("application/pgp-keys"))))
;;;###autoload
(defun mm-uu-dissect (&optional noheader mime-type)
"Dissect the current buffer and return a list of uu handles.
The optional NOHEADER means there's no header in the buffer.
MIME-TYPE specifies a MIME type and parameters, which defaults to the
value of `mm-uu-text-plain-type'."
(let ((case-fold-search t)
(mm-uu-text-plain-type (or mime-type mm-uu-text-plain-type))
text-start start-point end-point file-name result entry func)
(save-excursion
(goto-char (point-min))
(cond
(noheader)
((looking-at "\n")
(forward-line))
((search-forward "\n\n" nil t)
t)
(t (goto-char (point-max))))
(setq text-start (point))
(while (re-search-forward mm-uu-beginning-regexp nil t)
(setq start-point (match-beginning 0)
entry nil)
(let ((alist mm-uu-type-alist)
(beginning-regexp (match-string 0)))
(while (not entry)
(if (string-match (mm-uu-beginning-regexp (car alist))
beginning-regexp)
(setq entry (car alist))
(pop alist))))
(if (setq func (mm-uu-function-1 entry))
(funcall func))
(forward-line);; in case of failure
(when (and (not (mm-uu-configure-p (mm-uu-type entry) 'disabled))
(let ((end-regexp (mm-uu-end-regexp entry)))
(if (not end-regexp)
(or (setq end-point (point-max)) t)
(prog1
(re-search-forward end-regexp nil t)
(forward-line)
(setq end-point (point)))))
(or (not (setq func (mm-uu-function-2 entry)))
(funcall func)))
(if (and (> start-point text-start)
(progn
(goto-char text-start)
(re-search-forward "." start-point t)))
(push
(mm-make-handle (mm-uu-copy-to-buffer text-start start-point)
mm-uu-text-plain-type)
result))
(push
(funcall (mm-uu-function-extract entry))
result)
(goto-char (setq text-start end-point))))
(when result
(if (and (> (point-max) (1+ text-start))
(save-excursion
(goto-char text-start)
(re-search-forward "." nil t)))
(push
(mm-make-handle (mm-uu-copy-to-buffer text-start (point-max))
mm-uu-text-plain-type)
result))
(setq result (cons "multipart/mixed" (nreverse result))))
result)))
;;;###autoload
(defun mm-uu-dissect-text-parts (handle &optional decoded)
"Dissect text parts and put uu handles into HANDLE.
Assume text has been decoded if DECODED is non-nil."
(let ((buffer (mm-handle-buffer handle)))
(cond ((stringp buffer)
(dolist (elem (cdr handle))
(mm-uu-dissect-text-parts elem decoded)))
((bufferp buffer)
(let ((type (mm-handle-media-type handle))
(case-fold-search t) ;; string-match
children charset encoding)
(when (and
(stringp type)
;; Mutt still uses application/pgp even though
;; it has already been withdrawn.
(string-match "\\`text/\\|\\`application/pgp\\'" type)
(setq
children
(with-current-buffer buffer
(cond
((or decoded
(eq (setq charset (mail-content-type-get
(mm-handle-type handle)
'charset))
'gnus-decoded))
(setq decoded t)
(mm-uu-dissect
t (cons type '((charset . gnus-decoded)))))
(charset
(setq decoded t)
(mm-with-multibyte-buffer
(insert (mm-decode-string (mm-get-part handle)
charset))
(mm-uu-dissect
t (cons type '((charset . gnus-decoded))))))
((setq encoding (mm-handle-encoding handle))
(setq decoded nil)
;; Inherit the multibyteness of the `buffer'.
(with-temp-buffer
(insert-buffer-substring buffer)
(mm-decode-content-transfer-encoding
encoding type)
(mm-uu-dissect t (list type))))
(t
(setq decoded nil)
(mm-uu-dissect t (list type)))))))
;; Ignore it if a given part is dissected into a single
;; part of which the type is the same as the given one.
(if (and (<= (length children) 2)
(string-equal (mm-handle-media-type (cadr children))
type))
(kill-buffer (mm-handle-buffer (cadr children)))
(kill-buffer buffer)
(setcdr handle (cdr children))
(setcar handle (car children)) ;; "multipart/mixed"
(dolist (elem (cdr children))
(mm-uu-dissect-text-parts elem decoded))))))
(t
(dolist (elem handle)
(mm-uu-dissect-text-parts elem decoded))))))
(provide 'mm-uu)
;; arch-tag: 7db076bf-53db-4320-aa19-ca76a1d2ab2c
;;; mm-uu.el ends here
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