1 ;;; imap.el --- imap library
3 ;; Copyright (C) 1998, 1999, 2000, 2001, 2002, 2003, 2004,
4 ;; 2005 Free Software Foundation, Inc.
6 ;; Author: Simon Josefsson <jas@pdc.kth.se>
9 ;; This file is part of GNU Emacs.
11 ;; GNU Emacs is free software; you can redistribute it and/or modify
12 ;; it under the terms of the GNU General Public License as published by
13 ;; the Free Software Foundation; either version 2, or (at your option)
16 ;; GNU Emacs is distributed in the hope that it will be useful,
17 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
18 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
19 ;; GNU General Public License for more details.
21 ;; You should have received a copy of the GNU General Public License
22 ;; along with GNU Emacs; see the file COPYING. If not, write to the
23 ;; Free Software Foundation, Inc., 51 Franklin Street, Fifth Floor,
24 ;; Boston, MA 02110-1301, USA.
28 ;; imap.el is a elisp library providing an interface for talking to
31 ;; imap.el is roughly divided in two parts, one that parses IMAP
32 ;; responses from the server and storing data into buffer-local
33 ;; variables, and one for utility functions which send commands to
34 ;; server, waits for an answer, and return information. The latter
35 ;; part is layered on top of the previous.
37 ;; The imap.el API consist of the following functions, other functions
38 ;; in this file should not be called directly and the result of doing
39 ;; so are at best undefined.
43 ;; imap-open, imap-opened, imap-authenticate, imap-close,
44 ;; imap-capability, imap-namespace, imap-error-text
48 ;; imap-mailbox-get, imap-mailbox-map, imap-current-mailbox,
49 ;; imap-current-mailbox-p, imap-search, imap-mailbox-select,
50 ;; imap-mailbox-examine, imap-mailbox-unselect, imap-mailbox-expunge
51 ;; imap-mailbox-close, imap-mailbox-create, imap-mailbox-delete
52 ;; imap-mailbox-rename, imap-mailbox-lsub, imap-mailbox-list
53 ;; imap-mailbox-subscribe, imap-mailbox-unsubscribe, imap-mailbox-status
54 ;; imap-mailbox-acl-get, imap-mailbox-acl-set, imap-mailbox-acl-delete
58 ;; imap-fetch-asynch, imap-fetch,
59 ;; imap-current-message, imap-list-to-message-set,
60 ;; imap-message-get, imap-message-map
61 ;; imap-message-envelope-date, imap-message-envelope-subject,
62 ;; imap-message-envelope-from, imap-message-envelope-sender,
63 ;; imap-message-envelope-reply-to, imap-message-envelope-to,
64 ;; imap-message-envelope-cc, imap-message-envelope-bcc
65 ;; imap-message-envelope-in-reply-to, imap-message-envelope-message-id
66 ;; imap-message-body, imap-message-flag-permanent-p
67 ;; imap-message-flags-set, imap-message-flags-del
68 ;; imap-message-flags-add, imap-message-copyuid
69 ;; imap-message-copy, imap-message-appenduid
70 ;; imap-message-append, imap-envelope-from
73 ;; It is my hope that these commands should be pretty self
74 ;; explanatory for someone that know IMAP. All functions have
75 ;; additional documentation on how to invoke them.
77 ;; imap.el support RFC1730/2060/RFC3501 (IMAP4/IMAP4rev1), implemented
78 ;; IMAP extensions are RFC2195 (CRAM-MD5), RFC2086 (ACL), RFC2342
79 ;; (NAMESPACE), RFC2359 (UIDPLUS), the IMAP-part of RFC2595 (STARTTLS,
80 ;; LOGINDISABLED) (with use of external library starttls.el and
81 ;; program starttls), and the GSSAPI / kerberos V4 sections of RFC1731
82 ;; (with use of external program `imtest'), RFC2971 (ID). It also
83 ;; take advantage the UNSELECT extension in Cyrus IMAPD.
85 ;; Without the work of John McClary Prevost and Jim Radford this library
86 ;; would not have seen the light of day. Many thanks.
88 ;; This is a transcript of short interactive session for demonstration
91 ;; (imap-open "my.mail.server")
92 ;; => " *imap* my.mail.server:0"
94 ;; The rest are invoked with current buffer as the buffer returned by
95 ;; `imap-open'. It is possible to do all without this, but it would
96 ;; look ugly here since `buffer' is always the last argument for all
97 ;; imap.el API functions.
99 ;; (imap-authenticate "myusername" "mypassword")
102 ;; (imap-mailbox-lsub "*")
103 ;; => ("INBOX.sentmail" "INBOX.private" "INBOX.draft" "INBOX.spam")
105 ;; (imap-mailbox-list "INBOX.n%")
106 ;; => ("INBOX.namedroppers" "INBOX.nnimap" "INBOX.ntbugtraq")
108 ;; (imap-mailbox-select "INBOX.nnimap")
111 ;; (imap-mailbox-get 'exists)
114 ;; (imap-mailbox-get 'uidvalidity)
117 ;; (imap-search "FLAGGED SINCE 18-DEC-98")
120 ;; (imap-fetch 235 "RFC822.PEEK" 'RFC822)
121 ;; => "X-Sieve: cmu-sieve 1.3^M\nX-Username: <jas@pdc.kth.se>^M\r...."
125 ;; o Parse UIDs as strings? We need to overcome the 28 bit limit somehow.
126 ;; o Don't use `read' at all (important places already fixed)
127 ;; o Accept list of articles instead of message set string in most
128 ;; imap-message-* functions.
129 ;; o Send strings as literal if they contain, e.g., ".
133 ;; - 19991218 added starttls/digest-md5 patch,
134 ;; by Daiki Ueno <ueno@ueda.info.waseda.ac.jp>
135 ;; NB! you need SLIM for starttls.el and digest-md5.el
136 ;; - 19991023 commited to pgnus
141 (eval-when-compile (require 'cl))
143 (autoload 'starttls-open-stream "starttls")
144 (autoload 'starttls-negotiate "starttls")
145 (autoload 'sasl-find-mechanism "sasl")
146 (autoload 'digest-md5-parse-digest-challenge "digest-md5")
147 (autoload 'digest-md5-digest-response "digest-md5")
148 (autoload 'digest-md5-digest-uri "digest-md5")
149 (autoload 'digest-md5-challenge "digest-md5")
150 (autoload 'rfc2104-hash "rfc2104")
151 (autoload 'utf7-encode "utf7")
152 (autoload 'utf7-decode "utf7")
153 (autoload 'format-spec "format-spec")
154 (autoload 'format-spec-make "format-spec")
155 (autoload 'open-tls-stream "tls"))
160 "Low-level IMAP issues."
164 (defcustom imap-kerberos4-program '("imtest -m kerberos_v4 -u %l -p %p %s"
166 "List of strings containing commands for Kerberos 4 authentication.
167 %s is replaced with server hostname, %p with port to connect to, and
168 %l with the value of `imap-default-user'. The program should accept
169 IMAP commands on stdin and return responses to stdout. Each entry in
170 the list is tried until a successful connection is made."
172 :type '(repeat string))
174 (defcustom imap-gssapi-program (list
175 (concat "gsasl %s %p "
176 "--imap --mechanism GSSAPI "
177 "--authentication-id %l")
178 "imtest -m gssapi -u %l -p %p %s")
179 "List of strings containing commands for GSSAPI (krb5) authentication.
180 %s is replaced with server hostname, %p with port to connect to, and
181 %l with the value of `imap-default-user'. The program should accept
182 IMAP commands on stdin and return responses to stdout. Each entry in
183 the list is tried until a successful connection is made."
185 :type '(repeat string))
187 (defcustom imap-ssl-program '("openssl s_client -quiet -ssl3 -connect %s:%p"
188 "openssl s_client -quiet -ssl2 -connect %s:%p"
189 "s_client -quiet -ssl3 -connect %s:%p"
190 "s_client -quiet -ssl2 -connect %s:%p")
191 "A string, or list of strings, containing commands for SSL connections.
192 Within a string, %s is replaced with the server address and %p with
193 port number on server. The program should accept IMAP commands on
194 stdin and return responses to stdout. Each entry in the list is tried
195 until a successful connection is made."
197 :type '(choice string
200 (defcustom imap-shell-program '("ssh %s imapd"
202 "ssh %g ssh %s imapd"
203 "rsh %g rsh %s imapd")
204 "A list of strings, containing commands for IMAP connection.
205 Within a string, %s is replaced with the server address, %p with port
206 number on server, %g with `imap-shell-host', and %l with
207 `imap-default-user'. The program should read IMAP commands from stdin
208 and write IMAP response to stdout. Each entry in the list is tried
209 until a successful connection is made."
211 :type '(repeat string))
213 (defcustom imap-process-connection-type nil
214 "*Value for `process-connection-type' to use for Kerberos4, GSSAPI and SSL.
215 The `process-connection-type' variable control type of device
216 used to communicate with subprocesses. Values are nil to use a
217 pipe, or t or `pty' to use a pty. The value has no effect if the
218 system has no ptys or if all ptys are busy: then a pipe is used
219 in any case. The value takes effect when a IMAP server is
220 opened, changing it after that has no effect."
225 (defcustom imap-use-utf7 t
226 "If non-nil, do utf7 encoding/decoding of mailbox names.
227 Since the UTF7 decoding currently only decodes into ISO-8859-1
228 characters, you may disable this decoding if you need to access UTF7
229 encoded mailboxes which doesn't translate into ISO-8859-1."
233 (defcustom imap-log nil
234 "If non-nil, a imap session trace is placed in *imap-log* buffer.
235 Note that username, passwords and other privacy sensitive
236 information (such as e-mail) may be stored in the *imap-log*
237 buffer. It is not written to disk, however. Do not enable this
238 variable unless you are comfortable with that."
242 (defcustom imap-debug nil
243 "If non-nil, random debug spews are placed in *imap-debug* buffer.
244 Note that username, passwords and other privacy sensitive
245 information (such as e-mail) may be stored in the *imap-debug*
246 buffer. It is not written to disk, however. Do not enable this
247 variable unless you are comfortable with that."
251 (defcustom imap-shell-host "gateway"
252 "Hostname of rlogin proxy."
256 (defcustom imap-default-user (user-login-name)
257 "Default username to use."
261 (defcustom imap-read-timeout (if (string-match
262 "windows-nt\\|os/2\\|emx\\|cygwin"
263 (symbol-name system-type))
266 "*How long to wait between checking for the end of output.
267 Shorter values mean quicker response, but is more CPU intensive."
271 (defcustom imap-store-password nil
272 "If non-nil, store session password without promting."
276 ;; Various variables.
278 (defvar imap-fetch-data-hook nil
279 "Hooks called after receiving each FETCH response.")
281 (defvar imap-streams '(gssapi kerberos4 starttls tls ssl network shell)
282 "Priority of streams to consider when opening connection to server.")
284 (defvar imap-stream-alist
285 '((gssapi imap-gssapi-stream-p imap-gssapi-open)
286 (kerberos4 imap-kerberos4-stream-p imap-kerberos4-open)
287 (tls imap-tls-p imap-tls-open)
288 (ssl imap-ssl-p imap-ssl-open)
289 (network imap-network-p imap-network-open)
290 (shell imap-shell-p imap-shell-open)
291 (starttls imap-starttls-p imap-starttls-open))
292 "Definition of network streams.
296 NAME names the stream, CHECK is a function returning non-nil if the
297 server support the stream and OPEN is a function for opening the
300 (defvar imap-authenticators '(gssapi
307 "Priority of authenticators to consider when authenticating to server.")
309 (defvar imap-authenticator-alist
310 '((gssapi imap-gssapi-auth-p imap-gssapi-auth)
311 (kerberos4 imap-kerberos4-auth-p imap-kerberos4-auth)
312 (sasl imap-sasl-auth-p imap-sasl-auth)
313 (cram-md5 imap-cram-md5-p imap-cram-md5-auth)
314 (login imap-login-p imap-login-auth)
315 (anonymous imap-anonymous-p imap-anonymous-auth)
316 (digest-md5 imap-digest-md5-p imap-digest-md5-auth))
317 "Definition of authenticators.
319 \(NAME CHECK AUTHENTICATE)
321 NAME names the authenticator. CHECK is a function returning non-nil if
322 the server support the authenticator and AUTHENTICATE is a function
323 for doing the actual authentication.")
325 (defvar imap-error nil
326 "Error codes from the last command.")
328 ;; Internal constants. Change these and die.
330 (defconst imap-default-port 143)
331 (defconst imap-default-ssl-port 993)
332 (defconst imap-default-tls-port 993)
333 (defconst imap-default-stream 'network)
334 (defconst imap-coding-system-for-read 'binary)
335 (defconst imap-coding-system-for-write 'binary)
336 (defconst imap-local-variables '(imap-server
345 imap-current-target-mailbox
355 imap-calculate-literal-size-first
357 (defconst imap-log-buffer "*imap-log*")
358 (defconst imap-debug-buffer "*imap-debug*")
360 ;; Internal variables.
362 (defvar imap-stream nil)
363 (defvar imap-auth nil)
364 (defvar imap-server nil)
365 (defvar imap-port nil)
366 (defvar imap-username nil)
367 (defvar imap-password nil)
368 (defvar imap-calculate-literal-size-first nil)
369 (defvar imap-state 'closed
371 Valid states are `closed', `initial', `nonauth', `auth', `selected'
374 (defvar imap-server-eol "\r\n"
375 "The EOL string sent from the server.")
377 (defvar imap-client-eol "\r\n"
378 "The EOL string we send to the server.")
380 (defvar imap-current-mailbox nil
381 "Current mailbox name.")
383 (defvar imap-current-target-mailbox nil
384 "Current target mailbox for COPY and APPEND commands.")
386 (defvar imap-mailbox-data nil
387 "Obarray with mailbox data.")
389 (defvar imap-mailbox-prime 997
390 "Length of imap-mailbox-data.")
392 (defvar imap-current-message nil
393 "Current message number.")
395 (defvar imap-message-data nil
396 "Obarray with message data.")
398 (defvar imap-message-prime 997
399 "Length of imap-message-data.")
401 (defvar imap-capability nil
402 "Capability for server.")
408 (defvar imap-namespace nil
409 "Namespace for current server.")
411 (defvar imap-reached-tag 0
412 "Lower limit on command tags that have been parsed.")
414 (defvar imap-failed-tags nil
415 "Alist of tags that failed.
416 Each element is a list with four elements; tag (a integer), response
417 state (a symbol, `OK', `NO' or `BAD'), response code (a string), and
418 human readable response text (a string).")
421 "Command tag number.")
423 (defvar imap-process nil
426 (defvar imap-continuation nil
427 "Non-nil indicates that the server emitted a continuation request.
428 The actual value is really the text on the continuation line.")
430 (defvar imap-callbacks nil
431 "List of response tags and callbacks, on the form `(number . function)'.
432 The function should take two arguments, the first the IMAP tag and the
433 second the status (OK, NO, BAD etc) of the command.")
436 ;; Utility functions:
438 (defun imap-remassoc (key alist)
439 "Delete by side effect any elements of LIST whose car is `equal' to KEY.
440 The modified LIST is returned. If the first member
441 of LIST has a car that is `equal' to KEY, there is no way to remove it
442 by side effect; therefore, write `(setq foo (remassoc key foo))' to be
443 sure of changing the value of `foo'."
445 (if (equal key (caar alist))
447 (setcdr alist (imap-remassoc key (cdr alist)))
450 (defsubst imap-disable-multibyte ()
451 "Enable multibyte in the current buffer."
452 (when (fboundp 'set-buffer-multibyte)
453 (set-buffer-multibyte nil)))
455 (defsubst imap-utf7-encode (string)
459 (utf7-encode string t)
461 "imap: Could not UTF7 encode `%s', using it unencoded..."
466 (defsubst imap-utf7-decode (string)
470 (utf7-decode string t)
472 "imap: Could not UTF7 decode `%s', using it undecoded..."
477 (defsubst imap-ok-p (status)
480 (setq imap-error status)
483 (defun imap-error-text (&optional buffer)
484 (with-current-buffer (or buffer (current-buffer))
485 (nth 3 (car imap-failed-tags))))