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e131541f PR |
1 | ;;; pmailmm.el --- MIME decoding and display stuff for PMAIL |
2 | ||
3 | ;; Copyright (C) 2006, 2007, 2008 Free Software Foundation, Inc. | |
4 | ||
5 | ;; Maintainer: FSF | |
6 | ;; Keywords: mail | |
7 | ||
8 | ;; This file is part of GNU Emacs. | |
9 | ||
10 | ;; GNU Emacs is free software; you can redistribute it and/or modify | |
11 | ;; it under the terms of the GNU General Public License as published by | |
12 | ;; the Free Software Foundation; either version 2, or (at your option) | |
13 | ;; any later version. | |
14 | ||
15 | ;; GNU Emacs is distributed in the hope that it will be useful, | |
16 | ;; but WITHOUT ANY WARRANTY; without even the implied warranty of | |
17 | ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the | |
18 | ;; GNU General Public License for more details. | |
19 | ||
20 | ;; You should have received a copy of the GNU General Public License | |
21 | ;; along with GNU Emacs; see the file COPYING. If not, write to the | |
22 | ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor, | |
23 | ;; Boston, MA 02110-1301, USA. | |
24 | ||
25 | ;;; Commentary: | |
26 | ||
27 | ;; Essentially based on the design of Alexander Pohoyda's MIME | |
28 | ;; extensions (mime-display.el and mime.el). To use, copy a complete | |
29 | ;; message into a new buffer and call (mime-show t). | |
30 | ||
31 | ;; To use: | |
32 | ||
33 | ;; (autoload 'pmail-mime "pmailmm" | |
34 | ;; "Show MIME message." t) | |
35 | ;; (add-hook 'pmail-mode-hook | |
36 | ;; (lambda () | |
37 | ;; (define-key pmail-mode-map (kbd "v") | |
38 | ;; 'pmail-mime))) | |
39 | ||
40 | ;;; Code: | |
41 | ||
acdc2006 PR |
42 | ;; For ... |
43 | (require 'pmail) | |
44 | ||
e131541f PR |
45 | ;;; Variables |
46 | ||
47 | (defcustom pmail-mime-media-type-handlers-alist | |
48 | '(("multipart/.*" pmail-mime-multipart-handler) | |
49 | ("text/.*" pmail-mime-text-handler) | |
50 | ("text/\\(x-\\)?patch" pmail-mime-bulk-handler) | |
51 | ("application/pgp-signature" pmail-mime-application/pgp-signature-handler) | |
52 | ("\\(image\\|audio\\|video\\|application\\)/.*" pmail-mime-bulk-handler)) | |
53 | "Alist of media type handlers, also known as agents. | |
54 | Every handler is a list of type (string symbol) where STRING is a | |
55 | regular expression to match the media type with and SYMBOL is a | |
56 | function to run. Handlers should return a non-nil value if the | |
57 | job is done." | |
58 | :type 'list | |
59 | :group 'mime) | |
60 | ||
61 | (defcustom pmail-mime-attachment-dirs-alist | |
62 | '(("text/.*" "~/Documents") | |
63 | ("image/.*" "~/Pictures") | |
64 | (".*" "~/Desktop" "~" "/tmp")) | |
65 | "Default directories to save attachments into. | |
66 | Each media type may have it's own list of directories in order of | |
67 | preference. The first existing directory in the list will be | |
68 | used." | |
69 | :type 'list | |
70 | :group 'mime) | |
71 | ||
72 | (defvar pmail-mime-total-number-of-bulk-attachments 0 | |
73 | "A total number of attached bulk bodyparts in the message. If more than 3, | |
74 | offer a way to save all attachments at once.") | |
75 | (put 'pmail-mime-total-number-of-bulk-attachments 'permanent-local t) | |
76 | ||
77 | ;;; Buttons | |
78 | ||
79 | (defun pmail-mime-save (button) | |
80 | "Save the attachment using info in the BUTTON." | |
81 | (let* ((filename (button-get button 'filename)) | |
82 | (directory (button-get button 'directory)) | |
83 | (data (button-get button 'data))) | |
84 | (while (file-exists-p (expand-file-name filename directory)) | |
85 | (let* ((f (file-name-sans-extension filename)) | |
86 | (i 1)) | |
87 | (when (string-match "-\\([0-9]+\\)$" f) | |
88 | (setq i (1+ (string-to-number (match-string 1 f))) | |
89 | f (substring f 0 (match-beginning 0)))) | |
90 | (setq filename (concat f "-" (number-to-string i) "." | |
91 | (file-name-extension filename))))) | |
92 | (setq filename (expand-file-name | |
93 | (read-file-name (format "Save as (default: %s): " filename) | |
94 | directory | |
95 | (expand-file-name filename directory)) | |
96 | directory)) | |
97 | (when (file-regular-p filename) | |
98 | (error (message "File `%s' already exists" filename))) | |
99 | (with-temp-file filename | |
100 | (set-buffer-file-coding-system 'no-conversion) | |
101 | (insert data)))) | |
102 | ||
103 | (define-button-type 'pmail-mime-save | |
104 | 'action 'pmail-mime-save) | |
105 | ||
106 | ;;; Handlers | |
107 | ||
108 | (defun pmail-mime-text-handler (content-type | |
109 | content-disposition | |
110 | content-transfer-encoding) | |
111 | "Handle the current buffer as a plain text MIME part." | |
112 | (let* ((charset (cdr (assq 'charset (cdr content-type)))) | |
113 | (coding-system (when charset | |
114 | (intern (downcase charset))))) | |
115 | (when (coding-system-p coding-system) | |
116 | (decode-coding-region (point-min) (point-max) coding-system)))) | |
117 | ||
118 | (defun test-pmail-mime-handler () | |
119 | "Test of a mail using no MIME parts at all." | |
120 | (let ((mail "To: alex@gnu.org | |
121 | Content-Type: text/plain; charset=koi8-r | |
122 | Content-Transfer-Encoding: 8bit | |
123 | MIME-Version: 1.0 | |
124 | ||
125 | \372\304\322\301\327\323\324\327\325\312\324\305\41")) | |
126 | (switch-to-buffer (get-buffer-create "*test*")) | |
127 | (erase-buffer) | |
128 | (set-buffer-multibyte nil) | |
129 | (insert mail) | |
130 | (pmail-mime-show t) | |
131 | (set-buffer-multibyte t))) | |
132 | ||
133 | (defun pmail-mime-bulk-handler (content-type | |
134 | content-disposition | |
135 | content-transfer-encoding) | |
136 | "Handle the current buffer as an attachment to download." | |
137 | (setq pmail-mime-total-number-of-bulk-attachments | |
138 | (1+ pmail-mime-total-number-of-bulk-attachments)) | |
139 | ;; Find the default directory for this media type | |
140 | (let* ((directory (catch 'directory | |
141 | (dolist (entry pmail-mime-attachment-dirs-alist) | |
142 | (when (string-match (car entry) (car content-type)) | |
143 | (dolist (dir (cdr entry)) | |
144 | (when (file-directory-p dir) | |
145 | (throw 'directory dir))))))) | |
146 | (filename (or (cdr (assq 'name (cdr content-type))) | |
147 | (cdr (assq 'filename (cdr content-disposition))) | |
148 | "noname")) | |
149 | (label (format "\nAttached %s file: " (car content-type))) | |
150 | (data (buffer-string))) | |
151 | (delete-region (point-min) (point-max)) | |
152 | (insert label) | |
153 | (insert-button filename | |
154 | :type 'pmail-mime-save | |
155 | 'filename filename | |
156 | 'directory directory | |
157 | 'data data))) | |
158 | ||
159 | (defun test-pmail-mime-bulk-handler () | |
160 | "Test of a mail used as an example in RFC 2183." | |
161 | (let ((mail "Content-Type: image/jpeg | |
162 | Content-Disposition: attachment; filename=genome.jpeg; | |
163 | modification-date=\"Wed, 12 Feb 1997 16:29:51 -0500\"; | |
164 | Content-Description: a complete map of the human genome | |
165 | Content-Transfer-Encoding: base64 | |
166 | ||
167 | iVBORw0KGgoAAAANSUhEUgAAADAAAAAwCAMAAABg3Am1AAAABGdBTUEAALGPC/xhBQAAAAZQ | |
168 | TFRF////AAAAVcLTfgAAAPZJREFUeNq9ldsOwzAIQ+3//+l1WlvA5ZLsoUiTto4TB+ISoAjy | |
169 | +ITfRBfcAmgRFFeAm+J6uhdKdFhFWUgDkFsK0oUp/9G2//Kj7Jx+5tSKOdBscgUYiKHRS/me | |
170 | WATQdRUvAK0Bnmshmtn79PpaLBbbOZkjKvRnjRZoRswOkG1wFchKew2g9wXVJVZL/m4+B+vv | |
171 | 9AxQQR2Q33SgAYJzzVACdAWjAfRYzYFO9n6SLnydtQHSMxYDMAKqZ/8FS/lTK+zuq3CtK64L | |
172 | UDwbgUEAUmk2Zyg101d6PhCDySgAvTvDgKiuOrc4dLxUb7UMnhGIexyI+d6U+ABuNAP4Simx | |
173 | lgAAAABJRU5ErkJggg== | |
174 | ")) | |
175 | (switch-to-buffer (get-buffer-create "*test*")) | |
176 | (erase-buffer) | |
177 | (insert mail) | |
178 | (pmail-mime-show))) | |
179 | ||
180 | (defun pmail-mime-multipart-handler (content-type | |
181 | content-disposition | |
182 | content-transfer-encoding) | |
183 | "Handle the current buffer as a multipart MIME body. | |
184 | The current buffer should be narrowed to the body. CONTENT-TYPE, | |
185 | CONTENT-DISPOSITION, and CONTENT-TRANSFER-ENCODING are the values | |
186 | of the respective parsed headers. See `pmail-mime-handle' for their | |
187 | format." | |
188 | ;; Some MUAs start boundaries with "--", while it should start | |
189 | ;; with "CRLF--", as defined by RFC 2046: | |
190 | ;; The boundary delimiter MUST occur at the beginning of a line, | |
191 | ;; i.e., following a CRLF, and the initial CRLF is considered to | |
192 | ;; be attached to the boundary delimiter line rather than part | |
193 | ;; of the preceding part. | |
194 | ;; We currently don't handle that. | |
195 | (let ((boundary (cdr (assq 'boundary content-type))) | |
acdc2006 | 196 | beg end next) |
e131541f | 197 | (unless boundary |
acdc2006 PR |
198 | (pmail-mm-get-boundary-error-message |
199 | "No boundary defined" content-type content-disposition | |
200 | content-transfer-encoding)) | |
e131541f PR |
201 | (setq boundary (concat "\n--" boundary)) |
202 | ;; Hide the body before the first bodypart | |
203 | (goto-char (point-min)) | |
204 | (when (and (search-forward boundary nil t) | |
205 | (looking-at "[ \t]*\n")) | |
206 | (delete-region (point-min) (match-end 0))) | |
207 | ;; Reset the counter | |
208 | (setq pmail-mime-total-number-of-bulk-attachments 0) | |
209 | ;; Loop over all body parts, where beg points at the beginning of | |
210 | ;; the part and end points at the end of the part. next points at | |
211 | ;; the beginning of the next part. | |
212 | (setq beg (point-min)) | |
213 | (while (search-forward boundary nil t) | |
214 | (setq end (match-beginning 0)) | |
215 | ;; If this is the last boundary according to RFC 2046, hide the | |
216 | ;; epilogue, else hide the boundary only. Use a marker for | |
217 | ;; `next' because `pmail-mime-show' may change the buffer. | |
218 | (cond ((looking-at "--[ \t]*\n") | |
219 | (setq next (point-max-marker))) | |
220 | ((looking-at "[ \t]*\n") | |
221 | (setq next (copy-marker (match-end 0)))) | |
222 | (t | |
acdc2006 PR |
223 | (pmail-mm-get-boundary-error-message |
224 | "Malformed boundary" content-type content-disposition | |
225 | content-transfer-encoding))) | |
e131541f PR |
226 | (delete-region end next) |
227 | ;; Handle the part. | |
228 | (save-match-data | |
229 | (save-excursion | |
230 | (save-restriction | |
231 | (narrow-to-region beg end) | |
232 | (pmail-mime-show)))) | |
233 | (setq beg next) | |
234 | (goto-char beg)))) | |
235 | ||
236 | (defun test-pmail-mime-multipart-handler () | |
237 | "Test of a mail used as an example in RFC 2046." | |
238 | (let ((mail "From: Nathaniel Borenstein <nsb@bellcore.com> | |
239 | To: Ned Freed <ned@innosoft.com> | |
240 | Date: Sun, 21 Mar 1993 23:56:48 -0800 (PST) | |
241 | Subject: Sample message | |
242 | MIME-Version: 1.0 | |
243 | Content-type: multipart/mixed; boundary=\"simple boundary\" | |
244 | ||
245 | This is the preamble. It is to be ignored, though it | |
246 | is a handy place for composition agents to include an | |
247 | explanatory note to non-MIME conformant readers. | |
248 | ||
249 | --simple boundary | |
250 | ||
251 | This is implicitly typed plain US-ASCII text. | |
252 | It does NOT end with a linebreak. | |
253 | --simple boundary | |
254 | Content-type: text/plain; charset=us-ascii | |
255 | ||
256 | This is explicitly typed plain US-ASCII text. | |
257 | It DOES end with a linebreak. | |
258 | ||
259 | --simple boundary-- | |
260 | ||
261 | This is the epilogue. It is also to be ignored.")) | |
262 | (switch-to-buffer (get-buffer-create "*test*")) | |
263 | (erase-buffer) | |
264 | (insert mail) | |
265 | (pmail-mime-show t))) | |
266 | ||
267 | ;;; Main code | |
268 | ||
269 | (defun pmail-mime-handle (content-type | |
270 | content-disposition | |
271 | content-transfer-encoding) | |
272 | "Handle the current buffer as a MIME part. | |
273 | The current buffer should be narrowed to the respective body, and | |
274 | point should be at the beginning of the body. | |
275 | ||
276 | CONTENT-TYPE, CONTENT-DISPOSITION, and CONTENT-TRANSFER-ENCODING | |
277 | are the values of the respective parsed headers. The parsed | |
278 | headers for CONTENT-TYPE and CONTENT-DISPOSITION have the form | |
279 | ||
280 | \(VALUE . ALIST) | |
281 | ||
282 | In other words: | |
283 | ||
284 | \(VALUE (ATTRIBUTE . VALUE) (ATTRIBUTE . VALUE) ...) | |
285 | ||
286 | VALUE is a string and ATTRIBUTE is a symbol. | |
287 | ||
288 | Consider the following header, for example: | |
289 | ||
290 | Content-Type: multipart/mixed; | |
291 | boundary=\"----=_NextPart_000_0104_01C617E4.BDEC4C40\" | |
292 | ||
293 | The parsed header value: | |
294 | ||
295 | \(\"multipart/mixed\" | |
296 | \(\"boundary\" . \"----=_NextPart_000_0104_01C617E4.BDEC4C40\"))" | |
297 | ;; Handle the content transfer encodings we know. Unknown transfer | |
298 | ;; encodings will be passed on to the various handlers. | |
299 | (cond ((string= content-transfer-encoding "base64") | |
300 | (when (ignore-errors | |
301 | (base64-decode-region (point) (point-max))) | |
302 | (setq content-transfer-encoding nil))) | |
303 | ((string= content-transfer-encoding "quoted-printable") | |
304 | (quoted-printable-decode-region (point) (point-max)) | |
305 | (setq content-transfer-encoding nil)) | |
306 | ((string= content-transfer-encoding "8bit") | |
307 | ;; FIXME: Is this the correct way? | |
308 | (set-buffer-multibyte nil))) | |
309 | ;; Inline stuff requires work. Attachments are handled by the bulk | |
310 | ;; handler. | |
311 | (if (string= "inline" (car content-disposition)) | |
312 | (let ((stop nil)) | |
313 | (dolist (entry pmail-mime-media-type-handlers-alist) | |
314 | (when (and (string-match (car entry) (car content-type)) (not stop)) | |
315 | (progn | |
316 | (setq stop (funcall (cadr entry) content-type | |
317 | content-disposition | |
318 | content-transfer-encoding)))))) | |
319 | ;; Everything else is an attachment. | |
320 | (pmail-mime-bulk-handler content-type | |
321 | content-disposition | |
322 | content-transfer-encoding))) | |
323 | ||
324 | (defun pmail-mime-show (&optional show-headers) | |
325 | "Handle the current buffer as a MIME message. | |
326 | If SHOW-HEADERS is non-nil, then the headers of the current part | |
327 | will shown as usual for a MIME message. The headers are also | |
328 | shown for the content type message/rfc822. This function will be | |
329 | called recursively if multiple parts are available. | |
330 | ||
331 | The current buffer must contain a single message. It will be | |
332 | modified." | |
333 | (let ((end (point-min)) | |
334 | content-type | |
335 | content-transfer-encoding | |
336 | content-disposition) | |
337 | ;; `point-min' returns the beginning and `end' points at the end | |
338 | ;; of the headers. We're not using `pmail-header-get-header' | |
339 | ;; because we must be able to handle the case of no headers | |
340 | ;; existing in a part. In this case end is at point-min. | |
341 | (goto-char (point-min)) | |
342 | ;; If we're showing a part without headers, then it will start | |
343 | ;; with a newline. | |
344 | (if (eq (char-after) ?\n) | |
345 | (setq end (1+ (point))) | |
346 | (when (search-forward "\n\n" nil t) | |
347 | (setq end (match-end 0)) | |
348 | (save-restriction | |
349 | (narrow-to-region (point-min) end) | |
350 | ;; FIXME: Default disposition of the multipart entities should | |
351 | ;; be inherited. | |
352 | (setq content-type | |
353 | (mail-fetch-field "Content-Type") | |
354 | content-transfer-encoding | |
355 | (mail-fetch-field "Content-Transfer-Encoding") | |
356 | content-disposition | |
357 | (mail-fetch-field "Content-Disposition"))))) | |
358 | (if content-type | |
359 | (setq content-type (mail-header-parse-content-type | |
360 | content-type)) | |
361 | ;; FIXME: Default "message/rfc822" in a "multipart/digest" | |
362 | ;; according to RFC 2046. | |
363 | (setq content-type '("text/plain"))) | |
364 | (setq content-disposition | |
365 | (if content-disposition | |
366 | (mail-header-parse-content-disposition content-disposition) | |
367 | ;; If none specified, we are free to choose what we deem | |
368 | ;; suitable according to RFC 2183. We like inline. | |
369 | '("inline"))) | |
370 | ;; Unrecognized disposition types are to be treated like | |
371 | ;; attachment according to RFC 2183. | |
372 | (unless (member (car content-disposition) '("inline" "attachment")) | |
373 | (setq content-disposition '("attachment"))) | |
374 | ;; Hide headers and handle the part. | |
375 | (save-restriction | |
376 | (cond ((string= (car content-type) "message/rfc822") | |
377 | (pmail-header-hide-headers) | |
378 | (narrow-to-region end (point-max))) | |
379 | (show-headers | |
380 | (pmail-header-hide-headers)) | |
381 | (t | |
382 | (delete-region (point-min) end))) | |
383 | (pmail-mime-handle content-type content-disposition | |
384 | content-transfer-encoding)))) | |
385 | ||
386 | (defun pmail-mime () | |
387 | "Copy buffer contents to a temporary buffer and handle MIME. | |
388 | This calls `pmail-mime-show' to do the real job." | |
389 | (interactive) | |
390 | (let ((data (with-current-buffer pmail-buffer | |
391 | (save-restriction | |
392 | (widen) | |
393 | (buffer-substring | |
394 | (pmail-desc-get-start pmail-current-message) | |
395 | (pmail-desc-get-end pmail-current-message))))) | |
396 | (buf (get-buffer-create "*PMAIL*"))) | |
397 | (set-buffer buf) | |
398 | (let ((inhibit-read-only t)) | |
399 | (erase-buffer) | |
400 | (insert data) | |
401 | (pmail-mime-show t)) | |
402 | (view-buffer buf))) | |
403 | ||
acdc2006 PR |
404 | (defun pmail-mm-get-boundary-error-message (message type disposition encoding) |
405 | "Return MESSAGE with more information on the main mime components." | |
406 | (error "%s; type: %s; disposition: %s; encoding: %s" | |
407 | message type disposition encoding)) | |
408 | ||
e131541f PR |
409 | (provide 'pmailmm) |
410 | ||
61520927 | 411 | ;; arch-tag: 3f2c5e5d-1aef-4512-bc20-fd737c9d5dd9 |
e131541f | 412 | ;; pmailmm.el ends here |