lisp/gnus/nnimap.el

   1 ;;; nnimap.el --- IMAP interface for Gnus
   2
   3 ;; Copyright (C) 2010-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;;         Simon Josefsson <simon@josefsson.org>
   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 3 of the License, or
  13 ;; (at your option) 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.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; nnimap interfaces Gnus with IMAP servers.
  26
  27 ;;; Code:
  28
  29 ;; For Emacs <22.2 and XEmacs.
  30 (eval-and-compile
  31   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  32
  33 (eval-and-compile
  34   (require 'nnheader)
  35   ;; In Emacs 24, `open-protocol-stream' is an autoloaded alias for
  36   ;; `make-network-stream'.
  37   (unless (fboundp 'open-protocol-stream)
  38     (require 'proto-stream)))
  39
  40 (eval-when-compile
  41   (require 'cl))
  42
  43 (require 'nnheader)
  44 (require 'gnus-util)
  45 (require 'gnus)
  46 (require 'nnoo)
  47 (require 'netrc)
  48 (require 'utf7)
  49 (require 'tls)
  50 (require 'parse-time)
  51 (require 'nnmail)
  52
  53 (autoload 'auth-source-forget+ "auth-source")
  54 (autoload 'auth-source-search "auth-source")
  55
  56 (nnoo-declare nnimap)
  57
  58 (defvoo nnimap-address nil
  59   "The address of the IMAP server.")
  60
  61 (defvoo nnimap-user nil
  62   "Username to use for authentication to the IMAP server.")
  63
  64 (defvoo nnimap-server-port nil
  65   "The IMAP port used.
  66 If nnimap-stream is `ssl', this will default to `imaps'.  If not,
  67 it will default to `imap'.")
  68
  69 (defvoo nnimap-stream 'undecided
  70   "How nnimap talks to the IMAP server.
  71 The value should be either `undecided', `ssl' or `tls',
  72 `network', `starttls', `plain', or `shell'.
  73
  74 If the value is `undecided', nnimap tries `ssl' first, then falls
  75 back on `network'.")
  76
  77 (defvoo nnimap-shell-program (if (boundp 'imap-shell-program)
  78                                  (if (listp imap-shell-program)
  79                                      (car imap-shell-program)
  80                                    imap-shell-program)
  81                                "ssh %s imapd"))
  82
  83 (defvoo nnimap-inbox nil
  84   "The mail box where incoming mail arrives and should be split out of.
  85 This can be a string or a list of strings
  86 For example, \"INBOX\" or (\"INBOX\" \"SENT\").")
  87
  88 (defvoo nnimap-split-methods nil
  89   "How mail is split.
  90 Uses the same syntax as `nnmail-split-methods'.")
  91
  92 (defvoo nnimap-split-fancy nil
  93   "Uses the same syntax as `nnmail-split-fancy'.")
  94
  95 (defvoo nnimap-unsplittable-articles '(%Deleted %Seen)
  96   "Articles with the flags in the list will not be considered when splitting.")
  97
  98 (make-obsolete-variable 'nnimap-split-rule "see `nnimap-split-methods'"
  99                         "Emacs 24.1")
 100
 101 (defvoo nnimap-authenticator nil
 102   "How nnimap authenticate itself to the server.
 103 Possible choices are nil (use default methods), `anonymous',
 104 `login', `plain' and `cram-md5'.")
 105
 106 (defvoo nnimap-expunge t
 107   "If non-nil, expunge articles after deleting them.
 108 This is always done if the server supports UID EXPUNGE, but it's
 109 not done by default on servers that doesn't support that command.")
 110
 111 (defvoo nnimap-streaming t
 112   "If non-nil, try to use streaming commands with IMAP servers.
 113 Switching this off will make nnimap slower, but it helps with
 114 some servers.")
 115
 116 (defvoo nnimap-connection-alist nil)
 117
 118 (defvoo nnimap-current-infos nil)
 119
 120 (defvoo nnimap-fetch-partial-articles nil
 121   "If non-nil, Gnus will fetch partial articles.
 122 If t, Gnus will fetch only the first part.  If a string, it
 123 will fetch all parts that have types that match that string.  A
 124 likely value would be \"text/\" to automatically fetch all
 125 textual parts.")
 126
 127 (defgroup nnimap nil
 128   "IMAP for Gnus."
 129   :group 'gnus)
 130
 131 (defcustom nnimap-request-articles-find-limit nil
 132   "Limit the number of articles to look for after moving an article."
 133   :type 'integer
 134   :version "24.3"
 135   :group 'nnimap)
 136
 137 (defvar nnimap-process nil)
 138
 139 (defvar nnimap-status-string "")
 140
 141 (defvar nnimap-split-download-body-default nil
 142   "Internal variable with default value for `nnimap-split-download-body'.")
 143
 144 (defvar nnimap-keepalive-timer nil)
 145 (defvar nnimap-process-buffers nil)
 146
 147 (defstruct nnimap
 148   group process commands capabilities select-result newlinep server
 149   last-command-time greeting examined stream-type initial-resync)
 150
 151 (defvar nnimap-object nil)
 152
 153 (defvar nnimap-mark-alist
 154   '((read "\\Seen" %Seen)
 155     (tick "\\Flagged" %Flagged)
 156     (reply "\\Answered" %Answered)
 157     (expire "gnus-expire")
 158     (dormant "gnus-dormant")
 159     (score "gnus-score")
 160     (save "gnus-save")
 161     (download "gnus-download")
 162     (forward "gnus-forward")))
 163
 164 (defvar nnimap-quirks
 165   '(("QRESYNC" "Zimbra" "QRESYNC ")))
 166
 167 (defvar nnimap-inhibit-logging nil)
 168
 169 (defun nnimap-buffer ()
 170   (nnimap-find-process-buffer nntp-server-buffer))
 171
 172 (defun nnimap-header-parameters ()
 173   (format "(UID RFC822.SIZE BODYSTRUCTURE %s)"
 174           (format
 175            (if (nnimap-ver4-p)
 176                "BODY.PEEK[HEADER.FIELDS %s]"
 177              "RFC822.HEADER.LINES %s")
 178            (append '(Subject From Date Message-Id
 179                              References In-Reply-To Xref)
 180                    nnmail-extra-headers))))
 181
 182 (deffoo nnimap-retrieve-headers (articles &optional group server fetch-old)
 183   (when group
 184     (setq group (nnimap-decode-gnus-group group)))
 185   (with-current-buffer nntp-server-buffer
 186     (erase-buffer)
 187     (when (nnimap-change-group group server)
 188       (with-current-buffer (nnimap-buffer)
 189         (erase-buffer)
 190         (nnimap-wait-for-response
 191          (nnimap-send-command
 192           "UID FETCH %s %s"
 193           (nnimap-article-ranges (gnus-compress-sequence articles))
 194           (nnimap-header-parameters))
 195          t)
 196         (nnimap-transform-headers)
 197         (nnheader-remove-cr-followed-by-lf))
 198       (insert-buffer-substring
 199        (nnimap-find-process-buffer (current-buffer))))
 200     'headers))
 201
 202 (defun nnimap-transform-headers ()
 203   (goto-char (point-min))
 204   (let (article lines size string)
 205     (block nil
 206       (while (not (eobp))
 207         (while (not (looking-at "\\* [0-9]+ FETCH"))
 208           (delete-region (point) (progn (forward-line 1) (point)))
 209           (when (eobp)
 210             (return)))
 211         (goto-char (match-end 0))
 212         ;; Unfold quoted {number} strings.
 213         (while (re-search-forward
 214                 "[^]][ (]{\\([0-9]+\\)}\r?\n"
 215                 (save-excursion
 216                   ;; Start of the header section.
 217                   (or (re-search-forward "] {[0-9]+}\r?\n" nil t)
 218                       ;; Start of the next FETCH.
 219                       (re-search-forward "\\* [0-9]+ FETCH" nil t)
 220                       (point-max)))
 221                 t)
 222           (setq size (string-to-number (match-string 1)))
 223           (delete-region (+ (match-beginning 0) 2) (point))
 224           (setq string (buffer-substring (point) (+ (point) size)))
 225           (delete-region (point) (+ (point) size))
 226           (insert (format "%S" (mm-subst-char-in-string ?\n ?\s string))))
 227         (beginning-of-line)
 228         (setq article
 229               (and (re-search-forward "UID \\([0-9]+\\)" (line-end-position)
 230                                       t)
 231                    (match-string 1)))
 232         (setq lines nil)
 233         (setq size
 234               (and (re-search-forward "RFC822.SIZE \\([0-9]+\\)"
 235                                       (line-end-position)
 236                                       t)
 237                    (match-string 1)))
 238         (beginning-of-line)
 239         (when (search-forward "BODYSTRUCTURE" (line-end-position) t)
 240           (let ((structure (ignore-errors
 241                              (read (current-buffer)))))
 242             (while (and (consp structure)
 243                         (not (atom (car structure))))
 244               (setq structure (car structure)))
 245             (setq lines (if (and
 246                              (stringp (car structure))
 247                              (equal (upcase (nth 0 structure)) "MESSAGE")
 248                              (equal (upcase (nth 1 structure)) "RFC822"))
 249                             (nth 9 structure)
 250                           (nth 7 structure)))))
 251         (delete-region (line-beginning-position) (line-end-position))
 252         (insert (format "211 %s Article retrieved." article))
 253         (forward-line 1)
 254         (when size
 255           (insert (format "Chars: %s\n" size)))
 256         (when lines
 257           (insert (format "Lines: %s\n" lines)))
 258         (unless (re-search-forward "^\r$" nil t)
 259           (goto-char (point-max)))
 260         (delete-region (line-beginning-position) (line-end-position))
 261         (insert ".")
 262         (forward-line 1)))))
 263
 264 (defun nnimap-unfold-quoted-lines ()
 265   ;; Unfold quoted {number} strings.
 266   (let (size string)
 267     (while (re-search-forward " {\\([0-9]+\\)}\r?\n" nil t)
 268       (setq size (string-to-number (match-string 1)))
 269       (delete-region (1+ (match-beginning 0)) (point))
 270       (setq string (buffer-substring (point) (+ (point) size)))
 271       (delete-region (point) (+ (point) size))
 272       (insert (format "%S" string)))))
 273
 274 (defun nnimap-get-length ()
 275   (and (re-search-forward "{\\([0-9]+\\)}" (line-end-position) t)
 276        (string-to-number (match-string 1))))
 277
 278 (defun nnimap-article-ranges (ranges)
 279   (let (result)
 280     (cond
 281      ((numberp ranges)
 282       (number-to-string ranges))
 283      ((numberp (cdr ranges))
 284       (format "%d:%d" (car ranges) (cdr ranges)))
 285      (t
 286       (dolist (elem ranges)
 287         (push
 288          (if (consp elem)
 289              (format "%d:%d" (car elem) (cdr elem))
 290            (number-to-string elem))
 291          result))
 292       (mapconcat #'identity (nreverse result) ",")))))
 293
 294 (deffoo nnimap-open-server (server &optional defs no-reconnect)
 295   (if (nnimap-server-opened server)
 296       t
 297     (unless (assq 'nnimap-address defs)
 298       (setq defs (append defs (list (list 'nnimap-address server)))))
 299     (nnoo-change-server 'nnimap server defs)
 300     (if no-reconnect
 301         (nnimap-find-connection nntp-server-buffer)
 302       (or (nnimap-find-connection nntp-server-buffer)
 303           (nnimap-open-connection nntp-server-buffer)))))
 304
 305 (defun nnimap-make-process-buffer (buffer)
 306   (with-current-buffer
 307       (generate-new-buffer (format " *nnimap %s %s %s*"
 308                                    nnimap-address nnimap-server-port
 309                                    (gnus-buffer-exists-p buffer)))
 310     (mm-disable-multibyte)
 311     (buffer-disable-undo)
 312     (gnus-add-buffer)
 313     (set (make-local-variable 'after-change-functions) nil)
 314     (set (make-local-variable 'nnimap-object)
 315          (make-nnimap :server (nnoo-current-server 'nnimap)
 316                       :initial-resync 0))
 317     (push (list buffer (current-buffer)) nnimap-connection-alist)
 318     (push (current-buffer) nnimap-process-buffers)
 319     (current-buffer)))
 320
 321 (defun nnimap-credentials (address ports user)
 322   (let* ((auth-source-creation-prompts
 323           '((user  . "IMAP user at %h: ")
 324             (secret . "IMAP password for %u@%h: ")))
 325          (found (nth 0 (auth-source-search :max 1
 326                                            :host address
 327                                            :port ports
 328                                            :user user
 329                                            :require '(:user :secret)
 330                                            :create t))))
 331     (if found
 332         (list (plist-get found :user)
 333               (let ((secret (plist-get found :secret)))
 334                 (if (functionp secret)
 335                     (funcall secret)
 336                   secret))
 337               (plist-get found :save-function))
 338       nil)))
 339
 340 (defun nnimap-keepalive ()
 341   (let ((now (current-time)))
 342     (dolist (buffer nnimap-process-buffers)
 343       (when (buffer-name buffer)
 344         (with-current-buffer buffer
 345           (when (and nnimap-object
 346                      (nnimap-last-command-time nnimap-object)
 347                      (> (gnus-float-time
 348                          (time-subtract
 349                           now
 350                           (nnimap-last-command-time nnimap-object)))
 351                         ;; More than five minutes since the last command.
 352                         (* 5 60)))
 353             (ignore-errors              ;E.g. "buffer foo has no process".
 354               (nnimap-send-command "NOOP"))))))))
 355
 356 (defun nnimap-open-connection (buffer)
 357   ;; Be backwards-compatible -- the earlier value of nnimap-stream was
 358   ;; `ssl' when nnimap-server-port was nil.  Sort of.
 359   (when (and nnimap-server-port
 360              (eq nnimap-stream 'undecided))
 361     (setq nnimap-stream 'ssl))
 362   (let ((stream
 363          (if (eq nnimap-stream 'undecided)
 364              (loop for type in '(ssl network)
 365                    for stream = (let ((nnimap-stream type))
 366                                   (nnimap-open-connection-1 buffer))
 367                    while (eq stream 'no-connect)
 368                    finally (return stream))
 369            (nnimap-open-connection-1 buffer))))
 370     (if (eq stream 'no-connect)
 371         nil
 372       stream)))
 373
 374 (defun nnimap-map-port (port)
 375   (if (equal port "imaps")
 376       "993"
 377     port))
 378
 379 (defun nnimap-open-connection-1 (buffer)
 380   (unless nnimap-keepalive-timer
 381     (setq nnimap-keepalive-timer (run-at-time (* 60 15) (* 60 15)
 382                                               #'nnimap-keepalive)))
 383   (with-current-buffer (nnimap-make-process-buffer buffer)
 384     (let* ((coding-system-for-read 'binary)
 385            (coding-system-for-write 'binary)
 386            (ports
 387             (cond
 388              ((memq nnimap-stream '(network plain starttls))
 389               (nnheader-message 7 "Opening connection to %s..."
 390                                 nnimap-address)
 391               '("imap" "143"))
 392              ((eq nnimap-stream 'shell)
 393               (nnheader-message 7 "Opening connection to %s via shell..."
 394                                 nnimap-address)
 395               '("imap"))
 396              ((memq nnimap-stream '(ssl tls))
 397               (nnheader-message 7 "Opening connection to %s via tls..."
 398                                 nnimap-address)
 399               '("imaps" "imap" "993" "143"))
 400              (t
 401               (error "Unknown stream type: %s" nnimap-stream))))
 402            login-result credentials)
 403       (when nnimap-server-port
 404         (push nnimap-server-port ports))
 405       (let* ((stream-list
 406               (open-protocol-stream
 407                "*nnimap*" (current-buffer) nnimap-address
 408                (nnimap-map-port (car ports))
 409                :type nnimap-stream
 410                :return-list t
 411                :shell-command nnimap-shell-program
 412                :capability-command "1 CAPABILITY\r\n"
 413                :end-of-command "\r\n"
 414                :success " OK "
 415                :starttls-function
 416                (lambda (capabilities)
 417                  (when (gnus-string-match-p "STARTTLS" capabilities)
 418                    "1 STARTTLS\r\n"))))
 419              (stream (car stream-list))
 420              (props (cdr stream-list))
 421              (greeting (plist-get props :greeting))
 422              (capabilities (plist-get props :capabilities))
 423              (stream-type (plist-get props :type)))
 424         (when (and stream (not (memq (process-status stream) '(open run))))
 425           (setq stream nil))
 426
 427         (when (and (fboundp 'set-network-process-option) ;; Not in XEmacs.
 428                    (fboundp 'process-type) ;; Emacs 22 doesn't provide it.
 429                    (eq (process-type stream) 'network))
 430           ;; Use TCP-keepalive so that connections that pass through a NAT
 431           ;; router don't hang when left idle.
 432           (set-network-process-option stream :keepalive t))
 433
 434         (setf (nnimap-process nnimap-object) stream)
 435         (setf (nnimap-stream-type nnimap-object) stream-type)
 436         (if (not stream)
 437             (progn
 438               (nnheader-report 'nnimap "Unable to contact %s:%s via %s"
 439                                nnimap-address (car ports) nnimap-stream)
 440               'no-connect)
 441           (gnus-set-process-query-on-exit-flag stream nil)
 442           (if (not (gnus-string-match-p "[*.] \\(OK\\|PREAUTH\\)" greeting))
 443               (nnheader-report 'nnimap "%s" greeting)
 444             ;; Store the greeting (for debugging purposes).
 445             (setf (nnimap-greeting nnimap-object) greeting)
 446             (setf (nnimap-capabilities nnimap-object)
 447                   (mapcar #'upcase
 448                           (split-string capabilities)))
 449             (unless (gnus-string-match-p "[*.] PREAUTH" greeting)
 450               (if (not (setq credentials
 451                              (if (eq nnimap-authenticator 'anonymous)
 452                                  (list "anonymous"
 453                                        (message-make-address))
 454                                ;; Look for the credentials based on
 455                                ;; the virtual server name and the address
 456                                (nnimap-credentials
 457                                 (gnus-delete-duplicates
 458                                  (list
 459                                   nnimap-address
 460                                   (nnoo-current-server 'nnimap)))
 461                                 ports
 462                                 nnimap-user))))
 463                   (setq nnimap-object nil)
 464                 (let ((nnimap-inhibit-logging t))
 465                   (setq login-result
 466                         (nnimap-login (car credentials) (cadr credentials))))
 467                 (if (car login-result)
 468                     (progn
 469                       ;; Save the credentials if a save function exists
 470                       ;; (such a function will only be passed if a new
 471                       ;; token was created).
 472                       (when (functionp (nth 2 credentials))
 473                         (funcall (nth 2 credentials)))
 474                       ;; See if CAPABILITY is set as part of login
 475                       ;; response.
 476                       (dolist (response (cddr login-result))
 477                         (when (string= "CAPABILITY" (upcase (car response)))
 478                           (setf (nnimap-capabilities nnimap-object)
 479                                 (mapcar #'upcase (cdr response))))))
 480                   ;; If the login failed, then forget the credentials
 481                   ;; that are now possibly cached.
 482                   (dolist (host (list (nnoo-current-server 'nnimap)
 483                                       nnimap-address))
 484                     (dolist (port ports)
 485                       (auth-source-forget+ :host host :port port)))
 486                   (delete-process (nnimap-process nnimap-object))
 487                   (setq nnimap-object nil))))
 488             (when nnimap-object
 489               (when (nnimap-capability "QRESYNC")
 490                 (nnimap-command "ENABLE QRESYNC"))
 491               (nnheader-message 7 "Opening connection to %s...done"
 492                                 nnimap-address)
 493               (nnimap-process nnimap-object))))))))
 494
 495 (autoload 'rfc2104-hash "rfc2104")
 496
 497 (defun nnimap-login (user password)
 498   (cond
 499    ;; Prefer plain LOGIN if it's enabled (since it requires fewer
 500    ;; round trips than CRAM-MD5, and it's less likely to be buggy),
 501    ;; and we're using an encrypted connection.
 502    ((and (not (nnimap-capability "LOGINDISABLED"))
 503          (eq (nnimap-stream-type nnimap-object) 'tls)
 504          (or (null nnimap-authenticator)
 505              (eq nnimap-authenticator 'login)))
 506     (nnimap-command "LOGIN %S %S" user password))
 507    ((and (nnimap-capability "AUTH=CRAM-MD5")
 508          (or (null nnimap-authenticator)
 509              (eq nnimap-authenticator 'cram-md5)))
 510     (erase-buffer)
 511     (let ((sequence (nnimap-send-command "AUTHENTICATE CRAM-MD5"))
 512           (challenge (nnimap-wait-for-line "^\\+\\(.*\\)\n")))
 513       (process-send-string
 514        (get-buffer-process (current-buffer))
 515        (concat
 516         (base64-encode-string
 517          (concat user " "
 518                  (rfc2104-hash 'md5 64 16 password
 519                                (base64-decode-string challenge))))
 520         "\r\n"))
 521       (nnimap-wait-for-response sequence)))
 522    ((and (not (nnimap-capability "LOGINDISABLED"))
 523          (or (null nnimap-authenticator)
 524              (eq nnimap-authenticator 'login)))
 525     (nnimap-command "LOGIN %S %S" user password))
 526    ((and (nnimap-capability "AUTH=PLAIN")
 527          (or (null nnimap-authenticator)
 528              (eq nnimap-authenticator 'plain)))
 529     (nnimap-command
 530      "AUTHENTICATE PLAIN %s"
 531      (base64-encode-string
 532       (format "\000%s\000%s"
 533               (nnimap-quote-specials user)
 534               (nnimap-quote-specials password)))))))
 535
 536 (defun nnimap-quote-specials (string)
 537   (with-temp-buffer
 538     (insert string)
 539     (goto-char (point-min))
 540     (while (re-search-forward "[\\\"]" nil t)
 541       (forward-char -1)
 542       (insert "\\")
 543       (forward-char 1))
 544     (buffer-string)))
 545
 546 (defun nnimap-find-parameter (parameter elems)
 547   (let (result)
 548     (dolist (elem elems)
 549       (cond
 550        ((equal (car elem) parameter)
 551         (setq result (cdr elem)))
 552        ((and (equal (car elem) "OK")
 553              (consp (cadr elem))
 554              (equal (caadr elem) parameter))
 555         (setq result (cdr (cadr elem))))))
 556     result))
 557
 558 (deffoo nnimap-close-server (&optional server)
 559   (when (nnoo-change-server 'nnimap server nil)
 560     (ignore-errors
 561       (delete-process (get-buffer-process (nnimap-buffer))))
 562     (nnoo-close-server 'nnimap server)
 563     t))
 564
 565 (deffoo nnimap-request-close ()
 566   t)
 567
 568 (deffoo nnimap-server-opened (&optional server)
 569   (and (nnoo-current-server-p 'nnimap server)
 570        nntp-server-buffer
 571        (gnus-buffer-live-p nntp-server-buffer)
 572        (nnimap-find-connection nntp-server-buffer)))
 573
 574 (deffoo nnimap-status-message (&optional server)
 575   nnimap-status-string)
 576
 577 (deffoo nnimap-request-article (article &optional group server to-buffer)
 578   (when group
 579     (setq group (nnimap-decode-gnus-group group)))
 580   (with-current-buffer nntp-server-buffer
 581     (let ((result (nnimap-change-group group server))
 582           parts structure)
 583       (when (stringp article)
 584         (setq article (nnimap-find-article-by-message-id group server article)))
 585       (when (and result
 586                  article)
 587         (erase-buffer)
 588         (with-current-buffer (nnimap-buffer)
 589           (erase-buffer)
 590           (when nnimap-fetch-partial-articles
 591             (nnimap-command "UID FETCH %d (BODYSTRUCTURE)" article)
 592             (goto-char (point-min))
 593             (when (re-search-forward "FETCH.*BODYSTRUCTURE" nil t)
 594               (setq structure (ignore-errors
 595                                 (let ((start (point)))
 596                                   (forward-sexp 1)
 597                                   (downcase-region start (point))
 598                                   (goto-char start)
 599                                   (read (current-buffer))))
 600                     parts (nnimap-find-wanted-parts structure))))
 601           (when (if parts
 602                     (nnimap-get-partial-article article parts structure)
 603                   (nnimap-get-whole-article article))
 604             (let ((buffer (current-buffer)))
 605               (with-current-buffer (or to-buffer nntp-server-buffer)
 606                 (nnheader-insert-buffer-substring buffer)
 607                 (nnheader-ms-strip-cr)))
 608             (cons group article)))))))
 609
 610 (deffoo nnimap-request-head (article &optional group server to-buffer)
 611   (when group
 612     (setq group (nnimap-decode-gnus-group group)))
 613   (when (nnimap-change-group group server)
 614     (with-current-buffer (nnimap-buffer)
 615       (when (stringp article)
 616         (setq article (nnimap-find-article-by-message-id group server article)))
 617       (if (null article)
 618           nil
 619         (nnimap-get-whole-article
 620          article (format "UID FETCH %%d %s"
 621                          (nnimap-header-parameters)))
 622         (let ((buffer (current-buffer)))
 623           (with-current-buffer (or to-buffer nntp-server-buffer)
 624             (erase-buffer)
 625             (insert-buffer-substring buffer)
 626             (nnheader-ms-strip-cr)
 627             (cons group article)))))))
 628
 629 (defun nnimap-get-whole-article (article &optional command)
 630   (let ((result
 631          (nnimap-command
 632           (or command
 633               (if (nnimap-ver4-p)
 634                   "UID FETCH %d BODY.PEEK[]"
 635                 "UID FETCH %d RFC822.PEEK"))
 636           article)))
 637     ;; Check that we really got an article.
 638     (goto-char (point-min))
 639     (unless (re-search-forward "\\* [0-9]+ FETCH" nil t)
 640       (setq result nil))
 641     (when result
 642       ;; Remove any data that may have arrived before the FETCH data.
 643       (beginning-of-line)
 644       (unless (bobp)
 645         (delete-region (point-min) (point)))
 646       (let ((bytes (nnimap-get-length)))
 647         (delete-region (line-beginning-position)
 648                        (progn (forward-line 1) (point)))
 649         (goto-char (+ (point) bytes))
 650         (delete-region (point) (point-max)))
 651       t)))
 652
 653 (defun nnimap-capability (capability)
 654   (member capability (nnimap-capabilities nnimap-object)))
 655
 656 (defun nnimap-ver4-p ()
 657   (nnimap-capability "IMAP4REV1"))
 658
 659 (defun nnimap-get-partial-article (article parts structure)
 660   (let ((result
 661          (nnimap-command
 662           "UID FETCH %d (%s %s)"
 663           article
 664           (if (nnimap-ver4-p)
 665               "BODY.PEEK[HEADER]"
 666             "RFC822.HEADER")
 667           (if (nnimap-ver4-p)
 668               (mapconcat (lambda (part)
 669                            (format "BODY.PEEK[%s]" part))
 670                          parts " ")
 671             (mapconcat (lambda (part)
 672                          (format "RFC822.PEEK[%s]" part))
 673                        parts " ")))))
 674     (when result
 675       (nnimap-convert-partial-article structure))))
 676
 677 (defun nnimap-convert-partial-article (structure)
 678   ;; First just skip past the headers.
 679   (goto-char (point-min))
 680   (let ((bytes (nnimap-get-length))
 681         id parts)
 682     ;; Delete "FETCH" line.
 683     (delete-region (line-beginning-position)
 684                    (progn (forward-line 1) (point)))
 685     (goto-char (+ (point) bytes))
 686     ;; Collect all the body parts.
 687     (while (looking-at ".*BODY\\[\\([.0-9]+\\)\\]")
 688       (setq id (match-string 1)
 689             bytes (or (nnimap-get-length) 0))
 690       (beginning-of-line)
 691       (delete-region (point) (progn (forward-line 1) (point)))
 692       (push (list id (buffer-substring (point) (+ (point) bytes)))
 693             parts)
 694       (delete-region (point) (+ (point) bytes)))
 695     ;; Delete trailing junk.
 696     (delete-region (point) (point-max))
 697     ;; Now insert all the parts again where they fit in the structure.
 698     (nnimap-insert-partial-structure structure parts)
 699     t))
 700
 701 (defun nnimap-insert-partial-structure (structure parts &optional subp)
 702   (let (type boundary)
 703     (let ((bstruc structure))
 704       (while (consp (car bstruc))
 705         (pop bstruc))
 706       (setq type (car bstruc))
 707       (setq bstruc (car (cdr bstruc)))
 708       (let ((has-boundary (member "boundary" bstruc)))
 709         (when has-boundary
 710           (setq boundary (cadr has-boundary)))))
 711     (when subp
 712       (insert (format "Content-type: multipart/%s; boundary=%S\n\n"
 713                       (downcase type) boundary)))
 714     (while (not (stringp (car structure)))
 715       (insert "\n--" boundary "\n")
 716       (if (consp (caar structure))
 717           (nnimap-insert-partial-structure (pop structure) parts t)
 718         (let ((bit (pop structure)))
 719           (insert (format "Content-type: %s/%s"
 720                           (downcase (nth 0 bit))
 721                           (downcase (nth 1 bit))))
 722           (if (member-ignore-case "CHARSET" (nth 2 bit))
 723               (insert (format
 724                        "; charset=%S\n"
 725                        (cadr (member-ignore-case "CHARSET" (nth 2 bit)))))
 726             (insert "\n"))
 727           (insert (format "Content-transfer-encoding: %s\n"
 728                           (nth 5 bit)))
 729           (insert "\n")
 730           (when (assoc (nth 9 bit) parts)
 731             (insert (cadr (assoc (nth 9 bit) parts)))))))
 732     (insert "\n--" boundary "--\n")))
 733
 734 (defun nnimap-find-wanted-parts (structure)
 735   (message-flatten-list (nnimap-find-wanted-parts-1 structure "")))
 736
 737 (defun nnimap-find-wanted-parts-1 (structure prefix)
 738   (let ((num 1)
 739         parts)
 740     (while (consp (car structure))
 741       (let ((sub (pop structure)))
 742         (if (consp (car sub))
 743             (push (nnimap-find-wanted-parts-1
 744                    sub (if (string= prefix "")
 745                            (number-to-string num)
 746                          (format "%s.%s" prefix num)))
 747                   parts)
 748           (let ((type (format "%s/%s" (nth 0 sub) (nth 1 sub)))
 749                 (id (if (string= prefix "")
 750                         (number-to-string num)
 751                       (format "%s.%s" prefix num))))
 752             (setcar (nthcdr 9 sub) id)
 753             (when (if (eq nnimap-fetch-partial-articles t)
 754                       (equal id "1")
 755                     (string-match nnimap-fetch-partial-articles type))
 756               (push id parts))))
 757         (incf num)))
 758     (nreverse parts)))
 759
 760 (defun nnimap-decode-gnus-group (group)
 761   (decode-coding-string group 'utf-8))
 762
 763 (deffoo nnimap-request-group (group &optional server dont-check info)
 764   (setq group (nnimap-decode-gnus-group group))
 765   (let ((result (nnimap-change-group
 766                  ;; Don't SELECT the group if we're going to select it
 767                  ;; later, anyway.
 768                  (if (and (not dont-check)
 769                           (assoc group nnimap-current-infos))
 770                      nil
 771                    group)
 772                  server))
 773         articles active marks high low)
 774     (with-current-buffer nntp-server-buffer
 775       (when result
 776         (if (and dont-check
 777                  (setq active (nth 2 (assoc group nnimap-current-infos))))
 778             (insert (format "211 %d %d %d %S\n"
 779                             (- (cdr active) (car active))
 780                             (car active)
 781                             (cdr active)
 782                             group))
 783           (with-current-buffer (nnimap-buffer)
 784             (erase-buffer)
 785             (let ((group-sequence
 786                    (nnimap-send-command "SELECT %S" (utf7-encode group t)))
 787                   (flag-sequence
 788                    (nnimap-send-command "UID FETCH 1:* FLAGS")))
 789               (setf (nnimap-group nnimap-object) group)
 790               (nnimap-wait-for-response flag-sequence)
 791               (setq marks
 792                     (nnimap-flags-to-marks
 793                      (nnimap-parse-flags
 794                       (list (list group-sequence flag-sequence
 795                                   1 group "SELECT")))))
 796               (when (and info
 797                          marks)
 798                 (nnimap-update-infos marks (list info))
 799                 (nnimap-store-info info (gnus-active (gnus-info-group info))))
 800               (goto-char (point-max))
 801               (let ((uidnext (nth 5 (car marks))))
 802                 (setq high (or (if uidnext
 803                                    (1- uidnext)
 804                                  (nth 3 (car marks)))
 805                                0)
 806                       low (or (nth 4 (car marks)) uidnext 1)))))
 807           (erase-buffer)
 808           (insert
 809            (format
 810             "211 %d %d %d %S\n" (1+ (- high low)) low high group)))
 811         t))))
 812
 813 (deffoo nnimap-request-create-group (group &optional server args)
 814   (setq group (nnimap-decode-gnus-group group))
 815   (when (nnimap-change-group nil server)
 816     (with-current-buffer (nnimap-buffer)
 817       (car (nnimap-command "CREATE %S" (utf7-encode group t))))))
 818
 819 (deffoo nnimap-request-delete-group (group &optional force server)
 820   (setq group (nnimap-decode-gnus-group group))
 821   (when (nnimap-change-group nil server)
 822     (with-current-buffer (nnimap-buffer)
 823       (car (nnimap-command "DELETE %S" (utf7-encode group t))))))
 824
 825 (deffoo nnimap-request-rename-group (group new-name &optional server)
 826   (setq group (nnimap-decode-gnus-group group))
 827   (when (nnimap-change-group nil server)
 828     (with-current-buffer (nnimap-buffer)
 829       (nnimap-unselect-group)
 830       (car (nnimap-command "RENAME %S %S"
 831                            (utf7-encode group t) (utf7-encode new-name t))))))
 832
 833 (defun nnimap-unselect-group ()
 834   ;; Make sure we don't have this group open read/write by asking
 835   ;; to examine a mailbox that doesn't exist.  This seems to be
 836   ;; the only way that allows us to reliably go back to unselected
 837   ;; state on Courier.
 838   (nnimap-command "EXAMINE DOES.NOT.EXIST"))
 839
 840 (deffoo nnimap-request-expunge-group (group &optional server)
 841   (setq group (nnimap-decode-gnus-group group))
 842   (when (nnimap-change-group group server)
 843     (with-current-buffer (nnimap-buffer)
 844       (car (nnimap-command "EXPUNGE")))))
 845
 846 (defun nnimap-get-flags (spec)
 847   (let ((articles nil)
 848         elems end)
 849     (with-current-buffer (nnimap-buffer)
 850       (erase-buffer)
 851       (nnimap-wait-for-response (nnimap-send-command
 852                                  "UID FETCH %s FLAGS" spec))
 853       (setq end (point))
 854       (subst-char-in-region (point-min) (point-max)
 855                             ?\\ ?% t)
 856       (goto-char (point-min))
 857       (while (search-forward " FETCH " end t)
 858         (setq elems (read (current-buffer)))
 859         (push (cons (cadr (memq 'UID elems))
 860                     (cadr (memq 'FLAGS elems)))
 861               articles)))
 862     (nreverse articles)))
 863
 864 (deffoo nnimap-close-group (group &optional server)
 865   t)
 866
 867 (deffoo nnimap-request-move-article (article group server accept-form
 868                                              &optional last internal-move-group)
 869   (setq group (nnimap-decode-gnus-group group))
 870   (when internal-move-group
 871     (setq internal-move-group (nnimap-decode-gnus-group internal-move-group)))
 872   (with-temp-buffer
 873     (mm-disable-multibyte)
 874     (when (funcall (if internal-move-group
 875                        'nnimap-request-head
 876                      'nnimap-request-article)
 877                    article group server (current-buffer))
 878       ;; If the move is internal (on the same server), just do it the easy
 879       ;; way.
 880       (let ((message-id (message-field-value "message-id")))
 881         (if internal-move-group
 882             (let ((result
 883                    (with-current-buffer (nnimap-buffer)
 884                      (nnimap-command "UID COPY %d %S"
 885                                      article
 886                                      (utf7-encode internal-move-group t)))))
 887               (when (car result)
 888                 (nnimap-delete-article article)
 889                 (cons internal-move-group
 890                       (or (nnimap-find-uid-response "COPYUID" (cadr result))
 891                           (nnimap-find-article-by-message-id
 892                            internal-move-group server message-id
 893                            nnimap-request-articles-find-limit)))))
 894           ;; Move the article to a different method.
 895           (let ((result (eval accept-form)))
 896             (when result
 897               (nnimap-change-group group server)
 898               (nnimap-delete-article article)
 899               result)))))))
 900
 901 (deffoo nnimap-request-expire-articles (articles group &optional server force)
 902   (setq group (nnimap-decode-gnus-group group))
 903   (cond
 904    ((null articles)
 905     nil)
 906    ((not (nnimap-change-group group server))
 907     articles)
 908    ((and force
 909          (eq nnmail-expiry-target 'delete))
 910     (unless (nnimap-delete-article (gnus-compress-sequence articles))
 911       (nnheader-message 7 "Article marked for deletion, but not expunged."))
 912     nil)
 913    (t
 914     (let ((deletable-articles
 915            (if (or force
 916                    (eq nnmail-expiry-wait 'immediate))
 917                articles
 918              (gnus-sorted-intersection
 919               articles
 920               (nnimap-find-expired-articles group)))))
 921       (if (null deletable-articles)
 922           articles
 923         (if (eq nnmail-expiry-target 'delete)
 924             (nnimap-delete-article (gnus-compress-sequence deletable-articles))
 925           (setq deletable-articles
 926                 (nnimap-process-expiry-targets
 927                  deletable-articles group server)))
 928         ;; Return the articles we didn't delete.
 929         (gnus-sorted-complement articles deletable-articles))))))
 930
 931 (defun nnimap-process-expiry-targets (articles group server)
 932   (let ((deleted-articles nil))
 933     (cond
 934      ;; shortcut further processing if we're going to delete the articles
 935      ((eq nnmail-expiry-target 'delete)
 936       (setq deleted-articles articles)
 937       t)
 938      ;; or just move them to another folder on the same IMAP server
 939      ((and (not (functionp nnmail-expiry-target))
 940            (gnus-server-equal (gnus-group-method nnmail-expiry-target)
 941                               (gnus-server-to-method
 942                                (format "nnimap:%s" server))))
 943       (and (nnimap-change-group group server)
 944            (with-current-buffer (nnimap-buffer)
 945              (nnheader-message 7 "Expiring articles from %s: %s" group articles)
 946              (nnimap-command
 947               "UID COPY %s %S"
 948               (nnimap-article-ranges (gnus-compress-sequence articles))
 949               (utf7-encode (gnus-group-real-name nnmail-expiry-target) t))
 950              (setq deleted-articles articles)))
 951       t)
 952      (t
 953       (dolist (article articles)
 954         (let ((target nnmail-expiry-target))
 955           (with-temp-buffer
 956             (mm-disable-multibyte)
 957             (when (nnimap-request-article article group server (current-buffer))
 958               (when (functionp target)
 959                 (setq target (funcall target group)))
 960               (if (and target
 961                        (not (eq target 'delete)))
 962                   (if (or (gnus-request-group target t)
 963                           (gnus-request-create-group target))
 964                       (progn
 965                         (nnmail-expiry-target-group target group)
 966                         (nnheader-message 7 "Expiring article %s:%d to %s"
 967                                           group article target))
 968                     (setq target nil))
 969                 (nnheader-message 7 "Expiring article %s:%d" group article))
 970               (when target
 971                 (push article deleted-articles))))))))
 972     ;; Change back to the current group again.
 973     (nnimap-change-group group server)
 974     (setq deleted-articles (nreverse deleted-articles))
 975     (nnimap-delete-article (gnus-compress-sequence deleted-articles))
 976     deleted-articles))
 977
 978 (defun nnimap-find-expired-articles (group)
 979   (let ((cutoff (nnmail-expired-article-p group nil nil)))
 980     (with-current-buffer (nnimap-buffer)
 981       (let ((result
 982              (nnimap-command
 983               "UID SEARCH SENTBEFORE %s"
 984               (format-time-string
 985                (format "%%d-%s-%%Y"
 986                        (upcase
 987                         (car (rassoc (nth 4 (decode-time cutoff))
 988                                      parse-time-months))))
 989                cutoff))))
 990         (and (car result)
 991              (delete 0 (mapcar #'string-to-number
 992                                (cdr (assoc "SEARCH" (cdr result))))))))))
 993
 994
 995 (defun nnimap-find-article-by-message-id (group server message-id
 996                                                 &optional limit)
 997   "Search for message with MESSAGE-ID in GROUP from SERVER.
 998 If LIMIT, first try to limit the search to the N last articles."
 999   (with-current-buffer (nnimap-buffer)
1000     (erase-buffer)
1001     (let* ((change-group-result (nnimap-change-group group server nil t))
1002            (number-of-article
1003             (and (listp change-group-result)
1004                  (catch 'found
1005                    (dolist (result (cdr change-group-result))
1006                      (when (equal "EXISTS" (cadr result))
1007                        (throw 'found (car result)))))))
1008            (sequence
1009             (nnimap-send-command
1010              "UID SEARCH%s HEADER Message-Id %S"
1011              (if (and limit number-of-article)
1012                  ;; The -1 is because IMAP message
1013                  ;; numbers are one-based rather than
1014                  ;; zero-based.
1015                  (format " %s:*" (- (string-to-number number-of-article)
1016                                     limit -1))
1017                "")
1018              message-id)))
1019       (when (nnimap-wait-for-response sequence)
1020         (let ((article (car (last (cdr (assoc "SEARCH"
1021                                               (nnimap-parse-response)))))))
1022           (if article
1023               (string-to-number article)
1024             (when (and limit number-of-article)
1025               (nnimap-find-article-by-message-id group server message-id))))))))
1026
1027 (defun nnimap-delete-article (articles)
1028   (with-current-buffer (nnimap-buffer)
1029     (nnimap-command "UID STORE %s +FLAGS.SILENT (\\Deleted)"
1030                     (nnimap-article-ranges articles))
1031     (cond
1032      ((nnimap-capability "UIDPLUS")
1033       (nnimap-command "UID EXPUNGE %s"
1034                       (nnimap-article-ranges articles))
1035       t)
1036      (nnimap-expunge
1037       (nnimap-command "EXPUNGE")
1038       t)
1039      (t (gnus-message 7 (concat "nnimap: nnimap-expunge is not set and the "
1040                                 "server doesn't support UIDPLUS, so we won't "
1041                                 "delete this article now"))))))
1042
1043 (deffoo nnimap-request-scan (&optional group server)
1044   (when group
1045     (setq group (nnimap-decode-gnus-group group)))
1046   (when (and (nnimap-change-group nil server)
1047              nnimap-inbox
1048              nnimap-split-methods)
1049     (nnheader-message 7 "nnimap %s splitting mail..." server)
1050     (if (listp nnimap-inbox)
1051        (dolist (nnimap-inbox nnimap-inbox)
1052          (nnimap-split-incoming-mail))
1053       (nnimap-split-incoming-mail))
1054     (nnheader-message 7 "nnimap %s splitting mail...done" server)))
1055
1056 (defun nnimap-marks-to-flags (marks)
1057   (let (flags flag)
1058     (dolist (mark marks)
1059       (when (setq flag (cadr (assq mark nnimap-mark-alist)))
1060         (push flag flags)))
1061     flags))
1062
1063 (deffoo nnimap-request-update-group-status (group status &optional server)
1064   (setq group (nnimap-decode-gnus-group group))
1065   (when (nnimap-change-group nil server)
1066     (let ((command (assoc
1067                     status
1068                     '((subscribe "SUBSCRIBE")
1069                       (unsubscribe "UNSUBSCRIBE")))))
1070       (when command
1071         (with-current-buffer (nnimap-buffer)
1072           (nnimap-command "%s %S" (cadr command) (utf7-encode group t)))))))
1073
1074 (deffoo nnimap-request-set-mark (group actions &optional server)
1075   (setq group (nnimap-decode-gnus-group group))
1076   (when (nnimap-change-group group server)
1077     (let (sequence)
1078       (with-current-buffer (nnimap-buffer)
1079         (erase-buffer)
1080         ;; Just send all the STORE commands without waiting for
1081         ;; response.  If they're successful, they're successful.
1082         (dolist (action actions)
1083           (destructuring-bind (range action marks) action
1084             (let ((flags (nnimap-marks-to-flags marks)))
1085               (when flags
1086                 (setq sequence (nnimap-send-command
1087                                 "UID STORE %s %sFLAGS.SILENT (%s)"
1088                                 (nnimap-article-ranges range)
1089                                 (cond
1090                                  ((eq action 'del) "-")
1091                                  ((eq action 'add) "+")
1092                                  ((eq action 'set) ""))
1093                                 (mapconcat #'identity flags " ")))))))
1094         ;; Wait for the last command to complete to avoid later
1095         ;; synchronization problems with the stream.
1096         (when sequence
1097           (nnimap-wait-for-response sequence))))))
1098
1099 (deffoo nnimap-request-accept-article (group &optional server last)
1100   (setq group (nnimap-decode-gnus-group group))
1101   (when (nnimap-change-group nil server)
1102     (nnmail-check-syntax)
1103     (let ((message-id (message-field-value "message-id"))
1104           sequence message)
1105       (nnimap-add-cr)
1106       (setq message (buffer-substring-no-properties (point-min) (point-max)))
1107       (with-current-buffer (nnimap-buffer)
1108         (when (setq message (or (nnimap-process-quirk "OK Gimap " 'append message)
1109                                 message))
1110           ;; If we have this group open read-only, then unselect it
1111           ;; before appending to it.
1112           (when (equal (nnimap-examined nnimap-object) group)
1113             (nnimap-unselect-group))
1114           (erase-buffer)
1115           (setq sequence (nnimap-send-command
1116                           "APPEND %S {%d}" (utf7-encode group t)
1117                           (length message)))
1118           (unless nnimap-streaming
1119             (nnimap-wait-for-connection "^[+]"))
1120           (process-send-string (get-buffer-process (current-buffer)) message)
1121           (process-send-string (get-buffer-process (current-buffer))
1122                                (if (nnimap-newlinep nnimap-object)
1123                                    "\n"
1124                                  "\r\n"))
1125           (let ((result (nnimap-get-response sequence)))
1126             (if (not (nnimap-ok-p result))
1127                 (progn
1128                   (nnheader-report 'nnimap "%s" result)
1129                   nil)
1130               (cons group
1131                     (or (nnimap-find-uid-response "APPENDUID" (car result))
1132                         (nnimap-find-article-by-message-id
1133                          group server message-id
1134                          nnimap-request-articles-find-limit))))))))))
1135
1136 (defun nnimap-process-quirk (greeting-match type data)
1137   (when (and (nnimap-greeting nnimap-object)
1138              (string-match greeting-match (nnimap-greeting nnimap-object))
1139              (eq type 'append)
1140              (string-match "\000" data))
1141     (let ((choice (gnus-multiple-choice
1142                    "Message contains NUL characters.  Delete, continue, abort? "
1143                    '((?d "Delete NUL characters")
1144                      (?c "Try to APPEND the message as is")
1145                      (?a "Abort")))))
1146       (cond
1147        ((eq choice ?a)
1148         (nnheader-report 'nnimap "Aborted APPEND due to NUL characters"))
1149        ((eq choice ?c)
1150         data)
1151        (t
1152         (with-temp-buffer
1153           (insert data)
1154           (goto-char (point-min))
1155           (while (search-forward "\000" nil t)
1156             (replace-match "" t t))
1157           (buffer-string)))))))
1158
1159 (defun nnimap-ok-p (value)
1160   (and (consp value)
1161        (consp (car value))
1162        (equal (caar value) "OK")))
1163
1164 (defun nnimap-find-uid-response (name list)
1165   (let ((result (car (last (nnimap-find-response-element name list)))))
1166     (and result
1167          (string-to-number result))))
1168
1169 (defun nnimap-find-response-element (name list)
1170   (let (result)
1171     (dolist (elem list)
1172       (when (and (consp elem)
1173                  (equal name (car elem)))
1174         (setq result elem)))
1175     result))
1176
1177 (deffoo nnimap-request-replace-article (article group buffer)
1178   (setq group (nnimap-decode-gnus-group group))
1179   (let (group-art)
1180     (when (and (nnimap-change-group group)
1181                ;; Put the article into the group.
1182                (with-current-buffer buffer
1183                  (setq group-art
1184                        (nnimap-request-accept-article group nil t))))
1185       (nnimap-delete-article (list article))
1186       ;; Return the new article number.
1187       (cdr group-art))))
1188
1189 (defun nnimap-add-cr ()
1190   (goto-char (point-min))
1191   (while (re-search-forward "\r?\n" nil t)
1192     (replace-match "\r\n" t t)))
1193
1194 (defun nnimap-get-groups ()
1195   (erase-buffer)
1196   (let ((sequence (nnimap-send-command "LIST \"\" \"*\""))
1197         groups)
1198     (nnimap-wait-for-response sequence)
1199     (subst-char-in-region (point-min) (point-max)
1200                           ?\\ ?% t)
1201     (goto-char (point-min))
1202     (nnimap-unfold-quoted-lines)
1203     (goto-char (point-min))
1204     (while (search-forward "* LIST " nil t)
1205       (let ((flags (read (current-buffer)))
1206             (separator (read (current-buffer)))
1207             (group (read (current-buffer))))
1208         (unless (member '%NoSelect flags)
1209           (push (utf7-decode (if (stringp group)
1210                                  group
1211                                (format "%s" group)) t)
1212                 groups))))
1213     (nreverse groups)))
1214
1215 (defun nnimap-get-responses (sequences)
1216   (let (responses)
1217     (dolist (sequence sequences)
1218       (goto-char (point-min))
1219       (when (re-search-forward (format "^%d " sequence) nil t)
1220         (push (list sequence (nnimap-parse-response))
1221               responses)))
1222     responses))
1223
1224 (deffoo nnimap-request-list (&optional server)
1225   (when (nnimap-change-group nil server)
1226     (with-current-buffer nntp-server-buffer
1227       (erase-buffer)
1228       (let ((groups
1229              (with-current-buffer (nnimap-buffer)
1230                (nnimap-get-groups)))
1231             sequences responses)
1232         (when groups
1233           (with-current-buffer (nnimap-buffer)
1234             (setf (nnimap-group nnimap-object) nil)
1235             (dolist (group groups)
1236               (setf (nnimap-examined nnimap-object) group)
1237               (push (list (nnimap-send-command "EXAMINE %S"
1238                                                (utf7-encode group t))
1239                           group)
1240                     sequences))
1241             (nnimap-wait-for-response (caar sequences))
1242             (setq responses
1243                   (nnimap-get-responses (mapcar #'car sequences))))
1244           (dolist (response responses)
1245             (let* ((sequence (car response))
1246                    (response (cadr response))
1247                    (group (cadr (assoc sequence sequences)))
1248                    (egroup (encode-coding-string group 'utf-8)))
1249               (when (and group
1250                          (equal (caar response) "OK"))
1251                 (let ((uidnext (nnimap-find-parameter "UIDNEXT" response))
1252                       highest exists)
1253                   (dolist (elem response)
1254                     (when (equal (cadr elem) "EXISTS")
1255                       (setq exists (string-to-number (car elem)))))
1256                   (when uidnext
1257                     (setq highest (1- (string-to-number (car uidnext)))))
1258                   (cond
1259                    ((null highest)
1260                     (insert (format "%S 0 1 y\n" egroup)))
1261                    ((zerop exists)
1262                     ;; Empty group.
1263                     (insert (format "%S %d %d y\n" egroup
1264                                     highest (1+ highest))))
1265                    (t
1266                     ;; Return the widest possible range.
1267                     (insert (format "%S %d 1 y\n" egroup
1268                                     (or highest exists)))))))))
1269           t)))))
1270
1271 (deffoo nnimap-request-newgroups (date &optional server)
1272   (when (nnimap-change-group nil server)
1273     (with-current-buffer nntp-server-buffer
1274       (erase-buffer)
1275       (dolist (group (with-current-buffer (nnimap-buffer)
1276                        (nnimap-get-groups)))
1277         (unless (assoc group nnimap-current-infos)
1278           ;; Insert dummy numbers here -- they don't matter.
1279           (insert (format "%S 0 1 y\n" (encode-coding-string group 'utf-8)))))
1280       t)))
1281
1282 (deffoo nnimap-retrieve-group-data-early (server infos)
1283   (when (and (nnimap-change-group nil server)
1284              infos)
1285     (with-current-buffer (nnimap-buffer)
1286       (erase-buffer)
1287       (setf (nnimap-group nnimap-object) nil)
1288       (setf (nnimap-initial-resync nnimap-object) 0)
1289       (let ((qresyncp (nnimap-capability "QRESYNC"))
1290             params groups sequences active uidvalidity modseq group
1291             unexist)
1292         ;; Go through the infos and gather the data needed to know
1293         ;; what and how to request the data.
1294         (dolist (info infos)
1295           (setq params (gnus-info-params info)
1296                 group (nnimap-decode-gnus-group
1297                        (gnus-group-real-name (gnus-info-group info)))
1298                 active (cdr (assq 'active params))
1299                 unexist (assq 'unexist (gnus-info-marks info))
1300                 uidvalidity (cdr (assq 'uidvalidity params))
1301                 modseq (cdr (assq 'modseq params)))
1302           (setf (nnimap-examined nnimap-object) group)
1303           (if (and qresyncp
1304                    uidvalidity
1305                    active
1306                    modseq
1307                    unexist)
1308               (push
1309                (list (nnimap-send-command "EXAMINE %S (%s (%s %s))"
1310                                           (utf7-encode group t)
1311                                           (nnimap-quirk "QRESYNC")
1312                                           uidvalidity modseq)
1313                      'qresync
1314                      nil group 'qresync)
1315                sequences)
1316             (let ((command
1317                    (if uidvalidity
1318                        "EXAMINE"
1319                      ;; If we don't have a UIDVALIDITY, then this is
1320                      ;; the first time we've seen the group, so we
1321                      ;; have to do a SELECT (which is slower than an
1322                      ;; examine), but will tell us whether the group
1323                      ;; is read-only or not.
1324                      "SELECT"))
1325                   start)
1326               (if (and active uidvalidity unexist)
1327                   ;; Fetch the last 100 flags.
1328                   (setq start (max 1 (- (cdr active) 100)))
1329                 (incf (nnimap-initial-resync nnimap-object))
1330                 (setq start 1))
1331               (push (list (nnimap-send-command "%s %S" command
1332                                                (utf7-encode group t))
1333                           (nnimap-send-command "UID FETCH %d:* FLAGS" start)
1334                           start group command)
1335                     sequences))))
1336         sequences))))
1337
1338 (defun nnimap-quirk (command)
1339   (let ((quirk (assoc command nnimap-quirks)))
1340     ;; If this server is of a type that matches a quirk, then return
1341     ;; the "quirked" command instead of the proper one.
1342     (if (or (null quirk)
1343             (not (string-match (nth 1 quirk) (nnimap-greeting nnimap-object))))
1344         command
1345       (nth 2 quirk))))
1346
1347 (deffoo nnimap-finish-retrieve-group-infos (server infos sequences)
1348   (when (and sequences
1349              (nnimap-change-group nil server t)
1350              ;; Check that the process is still alive.
1351              (get-buffer-process (nnimap-buffer))
1352              (memq (process-status (get-buffer-process (nnimap-buffer)))
1353                    '(open run)))
1354     (with-current-buffer (nnimap-buffer)
1355       ;; Wait for the final data to trickle in.
1356       (when (nnimap-wait-for-response (if (eq (cadar sequences) 'qresync)
1357                                           (caar sequences)
1358                                         (cadar sequences))
1359                                       t)
1360         ;; Now we should have most of the data we need, no matter
1361         ;; whether we're QRESYNCING, fetching all the flags from
1362         ;; scratch, or just fetching the last 100 flags per group.
1363         (nnimap-update-infos (nnimap-flags-to-marks
1364                               (nnimap-parse-flags
1365                                (nreverse sequences)))
1366                              infos)
1367         ;; Finally, just return something resembling an active file in
1368         ;; the nntp buffer, so that the agent can save the info, too.
1369         (with-current-buffer nntp-server-buffer
1370           (erase-buffer)
1371           (dolist (info infos)
1372             (let* ((group (gnus-info-group info))
1373                    (active (gnus-active group)))
1374               (when active
1375                 (insert (format "%S %d %d y\n"
1376                                 (decode-coding-string
1377                                  (gnus-group-real-name group) 'utf-8)
1378                                 (cdr active)
1379                                 (car active)))))))))))
1380
1381 (defun nnimap-update-infos (flags infos)
1382   (dolist (info infos)
1383     (let* ((group (nnimap-decode-gnus-group
1384                    (gnus-group-real-name (gnus-info-group info))))
1385            (marks (cdr (assoc group flags))))
1386       (when marks
1387         (nnimap-update-info info marks)))))
1388
1389 (defun nnimap-update-info (info marks)
1390   (destructuring-bind (existing flags high low uidnext start-article
1391                                 permanent-flags uidvalidity
1392                                 vanished highestmodseq) marks
1393     (cond
1394      ;; Ignore groups with no UIDNEXT/marks.  This happens for
1395      ;; completely empty groups.
1396      ((and (not existing)
1397            (not uidnext))
1398       (let ((active (cdr (assq 'active (gnus-info-params info)))))
1399         (when active
1400           (gnus-set-active (gnus-info-group info) active))))
1401      ;; We have a mismatch between the old and new UIDVALIDITY
1402      ;; identifiers, so we have to re-request the group info (the next
1403      ;; time).  This virtually never happens.
1404      ((let ((old-uidvalidity
1405              (cdr (assq 'uidvalidity (gnus-info-params info)))))
1406         (and old-uidvalidity
1407              (not (equal old-uidvalidity uidvalidity))
1408              (or (not start-article)
1409                  (> start-article 1))))
1410       (gnus-group-remove-parameter info 'uidvalidity)
1411       (gnus-group-remove-parameter info 'modseq))
1412      ;; We have the data needed to update.
1413      (t
1414       (let* ((group (gnus-info-group info))
1415              (completep (and start-article
1416                              (= start-article 1)))
1417              (active (or (gnus-active group)
1418                          (cdr (assq 'active (gnus-info-params info))))))
1419         (when uidnext
1420           (setq high (1- uidnext)))
1421         ;; First set the active ranges based on high/low.
1422         (if (or completep
1423                 (not (gnus-active group)))
1424             (gnus-set-active group
1425                              (cond
1426                               (active
1427                                (cons (min (or low (car active))
1428                                           (car active))
1429                                      (max (or high (cdr active))
1430                                           (cdr active))))
1431                               ((and low high)
1432                                (cons low high))
1433                               (uidnext
1434                                ;; No articles in this group.
1435                                (cons uidnext (1- uidnext)))
1436                               (start-article
1437                                (cons start-article (1- start-article)))
1438                               (t
1439                                ;; No articles and no uidnext.
1440                                nil)))
1441           (gnus-set-active group
1442                            (cons (car active)
1443                                  (or high (1- uidnext)))))
1444         ;; See whether this is a read-only group.
1445         (unless (eq permanent-flags 'not-scanned)
1446           (gnus-group-set-parameter
1447            info 'permanent-flags
1448            (and (or (memq '%* permanent-flags)
1449                     (memq '%Seen permanent-flags))
1450                 permanent-flags)))
1451         ;; Update marks and read articles if this isn't a
1452         ;; read-only IMAP group.
1453         (when (setq permanent-flags
1454                     (cdr (assq 'permanent-flags (gnus-info-params info))))
1455           (if (and highestmodseq
1456                    (not start-article))
1457               ;; We've gotten the data by QRESYNCing.
1458               (nnimap-update-qresync-info
1459                info existing (nnimap-imap-ranges-to-gnus-ranges vanished) flags)
1460             ;; Do normal non-QRESYNC flag updates.
1461             ;; Update the list of read articles.
1462             (let* ((unread
1463                     (gnus-compress-sequence
1464                      (gnus-set-difference
1465                       (gnus-set-difference
1466                        existing
1467                        (gnus-sorted-union
1468                         (cdr (assoc '%Seen flags))
1469                         (cdr (assoc '%Deleted flags))))
1470                       (cdr (assoc '%Flagged flags)))))
1471                    (read (gnus-range-difference
1472                           (cons start-article high) unread)))
1473               (when (> start-article 1)
1474                 (setq read
1475                       (gnus-range-nconcat
1476                        (if (> start-article 1)
1477                            (gnus-sorted-range-intersection
1478                             (cons 1 (1- start-article))
1479                             (gnus-info-read info))
1480                          (gnus-info-read info))
1481                        read)))
1482               (when (or (not (listp permanent-flags))
1483                         (memq '%Seen permanent-flags))
1484                 (gnus-info-set-read info read))
1485               ;; Update the marks.
1486               (setq marks (gnus-info-marks info))
1487               (dolist (type (cdr nnimap-mark-alist))
1488                 (when (or (not (listp permanent-flags))
1489                           (memq (car (assoc (caddr type) flags))
1490                                 permanent-flags)
1491                           (memq '%* permanent-flags))
1492                   (let ((old-marks (assoc (car type) marks))
1493                         (new-marks
1494                          (gnus-compress-sequence
1495                           (cdr (or (assoc (caddr type) flags) ; %Flagged
1496                                    (assoc (intern (cadr type) obarray) flags)
1497                                    (assoc (cadr type) flags)))))) ; "\Flagged"
1498                     (setq marks (delq old-marks marks))
1499                     (pop old-marks)
1500                     (when (and old-marks
1501                                (> start-article 1))
1502                       (setq old-marks (gnus-range-difference
1503                                        old-marks
1504                                        (cons start-article high)))
1505                       (setq new-marks (gnus-range-nconcat old-marks new-marks)))
1506                     (when new-marks
1507                       (push (cons (car type) new-marks) marks)))))
1508               ;; Keep track of non-existing articles.
1509               (let* ((old-unexists (assq 'unexist marks))
1510                      (active (gnus-active group))
1511                      (unexists
1512                       (if completep
1513                           (gnus-range-difference
1514                            active
1515                            (gnus-compress-sequence existing))
1516                         (gnus-add-to-range
1517                          (cdr old-unexists)
1518                          (gnus-list-range-difference
1519                           existing (gnus-active group))))))
1520                 (when (> (car active) 1)
1521                   (setq unexists (gnus-range-add
1522                                   (cons 1 (1- (car active)))
1523                                   unexists)))
1524                 (if old-unexists
1525                     (setcdr old-unexists unexists)
1526                   (push (cons 'unexist unexists) marks)))
1527               (gnus-info-set-marks info marks t))))
1528         ;; Tell Gnus whether there are any \Recent messages in any of
1529         ;; the groups.
1530         (let ((recent (cdr (assoc '%Recent flags))))
1531           (when (and active
1532                      recent
1533                      (> (car (last recent)) (cdr active)))
1534             (push (list (cons (gnus-group-real-name group) 0))
1535                   nnmail-split-history)))
1536         ;; Note the active level for the next run-through.
1537         (gnus-group-set-parameter info 'active (gnus-active group))
1538         (gnus-group-set-parameter info 'uidvalidity uidvalidity)
1539         (gnus-group-set-parameter info 'modseq highestmodseq)
1540         (nnimap-store-info info (gnus-active group)))))))
1541
1542 (defun nnimap-update-qresync-info (info existing vanished flags)
1543   ;; Add all the vanished articles to the list of read articles.
1544   (gnus-info-set-read
1545    info
1546    (gnus-add-to-range
1547     (gnus-add-to-range
1548      (gnus-range-add (gnus-info-read info)
1549                      vanished)
1550      (cdr (assq '%Flagged flags)))
1551     (cdr (assq '%Seen flags))))
1552   (let ((marks (gnus-info-marks info)))
1553     (dolist (type (cdr nnimap-mark-alist))
1554       (let ((ticks (assoc (car type) marks))
1555             (new-marks
1556              (cdr (or (assoc (caddr type) flags) ; %Flagged
1557                       (assoc (intern (cadr type) obarray) flags)
1558                       (assoc (cadr type) flags))))) ; "\Flagged"
1559         (setq marks (delq ticks marks))
1560         (pop ticks)
1561         ;; Add the new marks we got.
1562         (setq ticks (gnus-add-to-range ticks new-marks))
1563         ;; Remove the marks from messages that don't have them.
1564         (setq ticks (gnus-remove-from-range
1565                      ticks
1566                      (gnus-compress-sequence
1567                       (gnus-sorted-complement existing new-marks))))
1568         (when ticks
1569           (push (cons (car type) ticks) marks)))
1570       (gnus-info-set-marks info marks t))
1571     ;; Add vanished to the list of unexisting articles.
1572     (when vanished
1573       (let* ((old-unexists (assq 'unexist marks))
1574              (unexists (gnus-range-add (cdr old-unexists) vanished)))
1575         (if old-unexists
1576             (setcdr old-unexists unexists)
1577           (push (cons 'unexist unexists) marks)))
1578       (gnus-info-set-marks info marks t))))
1579
1580 (defun nnimap-imap-ranges-to-gnus-ranges (irange)
1581   (if (zerop (length irange))
1582       nil
1583     (let ((result nil))
1584       (dolist (elem (split-string irange ","))
1585         (push
1586          (if (string-match ":" elem)
1587              (let ((numbers (split-string elem ":")))
1588                (cons (string-to-number (car numbers))
1589                      (string-to-number (cadr numbers))))
1590            (string-to-number elem))
1591          result))
1592       (nreverse result))))
1593
1594 (defun nnimap-store-info (info active)
1595   (let* ((group (gnus-group-real-name (gnus-info-group info)))
1596          (entry (assoc group nnimap-current-infos)))
1597     (if entry
1598         (setcdr entry (list info active))
1599       (push (list group info active) nnimap-current-infos))))
1600
1601 (defun nnimap-flags-to-marks (groups)
1602   (let (data group totalp uidnext articles start-article mark permanent-flags
1603              uidvalidity vanished highestmodseq)
1604     (dolist (elem groups)
1605       (setq group (car elem)
1606             uidnext (nth 1 elem)
1607             start-article (nth 2 elem)
1608             permanent-flags (nth 3 elem)
1609             uidvalidity (nth 4 elem)
1610             vanished (nth 5 elem)
1611             highestmodseq (nth 6 elem)
1612             articles (nthcdr 7 elem))
1613       (let ((high (caar articles))
1614             marks low existing)
1615         (dolist (article articles)
1616           (setq low (car article))
1617           (push (car article) existing)
1618           (dolist (flag (cdr article))
1619             (setq mark (assoc flag marks))
1620             (if (not mark)
1621                 (push (list flag (car article)) marks)
1622               (setcdr mark (cons (car article) (cdr mark))))))
1623         (push (list group existing marks high low uidnext start-article
1624                     permanent-flags uidvalidity vanished highestmodseq)
1625               data)))
1626     data))
1627
1628 (defun nnimap-parse-flags (sequences)
1629   (goto-char (point-min))
1630   ;; Change \Delete etc to %Delete, so that the Emacs Lisp reader can
1631   ;; read it.
1632   (subst-char-in-region (point-min) (point-max)
1633                         ?\\ ?% t)
1634   ;; Remove any MODSEQ entries in the buffer, because they may contain
1635   ;; numbers that are too large for 32-bit Emacsen.
1636   (while (re-search-forward " MODSEQ ([0-9]+)" nil t)
1637     (replace-match "" t t))
1638   (goto-char (point-min))
1639   (let (start end articles groups uidnext elems permanent-flags
1640               uidvalidity vanished highestmodseq)
1641     (dolist (elem sequences)
1642       (destructuring-bind (group-sequence flag-sequence totalp group command)
1643           elem
1644         (setq start (point))
1645         (when (and
1646                ;; The EXAMINE was successful.
1647                (search-forward (format "\n%d OK " group-sequence) nil t)
1648                (progn
1649                  (forward-line 1)
1650                  (setq end (point))
1651                  (goto-char start)
1652                  (setq permanent-flags
1653                        (if (equal command "SELECT")
1654                            (and (search-forward "PERMANENTFLAGS "
1655                                                 (or end (point-min)) t)
1656                                 (read (current-buffer)))
1657                          'not-scanned))
1658                  (goto-char start)
1659                  (setq uidnext
1660                        (and (search-forward "UIDNEXT "
1661                                             (or end (point-min)) t)
1662                             (read (current-buffer))))
1663                  (goto-char start)
1664                  (setq uidvalidity
1665                        (and (re-search-forward "UIDVALIDITY \\([0-9]+\\)"
1666                                                (or end (point-min)) t)
1667                             ;; Store UIDVALIDITY as a string, as it's
1668                             ;; too big for 32-bit Emacsen, usually.
1669                             (match-string 1)))
1670                  (goto-char start)
1671                  (setq vanished
1672                        (and (eq flag-sequence 'qresync)
1673                             (re-search-forward "^\\* VANISHED .*? \\([0-9:,]+\\)"
1674                                                (or end (point-min)) t)
1675                             (match-string 1)))
1676                  (goto-char start)
1677                  (setq highestmodseq
1678                        (and (re-search-forward "HIGHESTMODSEQ \\([0-9]+\\)"
1679                                             (or end (point-min)) t)
1680                             (match-string 1)))
1681                  (goto-char end)
1682                  (forward-line -1))
1683                ;; The UID FETCH FLAGS was successful.
1684                (or (eq flag-sequence 'qresync)
1685                    (search-forward (format "\n%d OK " flag-sequence) nil t)))
1686           (if (eq flag-sequence 'qresync)
1687               (progn
1688                 (goto-char start)
1689                 (setq start end))
1690             (setq start (point))
1691             (goto-char end))
1692           (while (re-search-forward "^\\* [0-9]+ FETCH " start t)
1693             (let ((p (point)))
1694               (setq elems (read (current-buffer)))
1695               (push (cons (cadr (memq 'UID elems))
1696                           (cadr (memq 'FLAGS elems)))
1697                     articles)))
1698           (push (nconc (list group uidnext totalp permanent-flags uidvalidity
1699                              vanished highestmodseq)
1700                        articles)
1701                 groups)
1702           (if (eq flag-sequence 'qresync)
1703               (goto-char end)
1704             (setq end (point)))
1705           (setq articles nil))))
1706     groups))
1707
1708 (defun nnimap-find-process-buffer (buffer)
1709   (cadr (assoc buffer nnimap-connection-alist)))
1710
1711 (deffoo nnimap-request-post (&optional server)
1712   (setq nnimap-status-string "Read-only server")
1713   nil)
1714
1715 (defvar gnus-refer-thread-use-nnir) ;; gnus-sum.el
1716 (declare-function gnus-fetch-headers "gnus-sum"
1717                   (articles &optional limit force-new dependencies))
1718
1719 (autoload 'nnir-search-thread "nnir")
1720
1721 (deffoo nnimap-request-thread (header &optional group server)
1722   (when group
1723     (setq group (nnimap-decode-gnus-group group)))
1724   (if gnus-refer-thread-use-nnir
1725       (nnir-search-thread header)
1726     (when (nnimap-change-group group server)
1727       (let* ((cmd (nnimap-make-thread-query header))
1728              (result (with-current-buffer (nnimap-buffer)
1729                        (nnimap-command  "UID SEARCH %s" cmd))))
1730         (when result
1731           (gnus-fetch-headers
1732            (and (car result)
1733                 (delete 0 (mapcar #'string-to-number
1734                                   (cdr (assoc "SEARCH" (cdr result))))))
1735            nil t))))))
1736
1737 (defun nnimap-change-group (group &optional server no-reconnect read-only)
1738   "Change group to GROUP if non-nil.
1739 If SERVER is set, check that server is connected, otherwise retry
1740 to reconnect, unless NO-RECONNECT is set to t.  Return nil if
1741 unsuccessful in connecting.
1742 If GROUP is nil, return t.
1743 If READ-ONLY is set, send EXAMINE rather than SELECT to the server.
1744 Return the server's response to the SELECT or EXAMINE command."
1745   (let ((open-result t))
1746     (when (and server
1747                (not (nnimap-server-opened server)))
1748       (setq open-result (nnimap-open-server server nil no-reconnect)))
1749     (cond
1750      ((not open-result)
1751       nil)
1752      ((not group)
1753       t)
1754      (t
1755       (with-current-buffer (nnimap-buffer)
1756         (let ((result (nnimap-command "%s %S"
1757                                       (if read-only
1758                                           "EXAMINE"
1759                                         "SELECT")
1760                                       (utf7-encode group t))))
1761           (when (car result)
1762             (setf (nnimap-group nnimap-object) group
1763                   (nnimap-select-result nnimap-object) result)
1764             result)))))))
1765
1766 (defun nnimap-find-connection (buffer)
1767   "Find the connection delivering to BUFFER."
1768   (let ((entry (assoc buffer nnimap-connection-alist)))
1769     (when entry
1770       (if (and (buffer-name (cadr entry))
1771                (get-buffer-process (cadr entry))
1772                (memq (process-status (get-buffer-process (cadr entry)))
1773                      '(open run)))
1774           (get-buffer-process (cadr entry))
1775         (setq nnimap-connection-alist (delq entry nnimap-connection-alist))
1776         nil))))
1777
1778 (defvar nnimap-sequence 0)
1779
1780 (defun nnimap-send-command (&rest args)
1781   (setf (nnimap-last-command-time nnimap-object) (current-time))
1782   (process-send-string
1783    (get-buffer-process (current-buffer))
1784    (nnimap-log-command
1785     (format "%d %s%s\n"
1786             (incf nnimap-sequence)
1787             (apply #'format args)
1788             (if (nnimap-newlinep nnimap-object)
1789                 ""
1790               "\r"))))
1791   ;; Some servers apparently can't have many outstanding
1792   ;; commands, so throttle them.
1793   (unless nnimap-streaming
1794     (nnimap-wait-for-response nnimap-sequence))
1795   nnimap-sequence)
1796
1797 (defvar nnimap-record-commands nil
1798   "If non-nil, log commands to the \"*imap log*\" buffer.")
1799
1800 (defun nnimap-log-buffer ()
1801   (let ((name "*imap log*"))
1802     (or (get-buffer name)
1803         (with-current-buffer (get-buffer-create name)
1804           (when (boundp 'window-point-insertion-type)
1805             (make-local-variable 'window-point-insertion-type)
1806             (setq window-point-insertion-type t))
1807           (current-buffer)))))
1808
1809 (defun nnimap-log-command (command)
1810   (when nnimap-record-commands
1811     (with-current-buffer (nnimap-log-buffer)
1812       (goto-char (point-max))
1813       (insert (format-time-string "%H:%M:%S")
1814               " [" nnimap-address "] "
1815               (if nnimap-inhibit-logging
1816                   "(inhibited)\n"
1817                 command))))
1818   command)
1819
1820 (defun nnimap-command (&rest args)
1821   (erase-buffer)
1822   (let* ((sequence (apply #'nnimap-send-command args))
1823          (response (nnimap-get-response sequence)))
1824     (if (equal (caar response) "OK")
1825         (cons t response)
1826       (nnheader-report 'nnimap "%s"
1827                        (mapconcat (lambda (a)
1828                                     (format "%s" a))
1829                                   (car response) " "))
1830       nil)))
1831
1832 (defun nnimap-get-response (sequence)
1833   (nnimap-wait-for-response sequence)
1834   (nnimap-parse-response))
1835
1836 (defun nnimap-wait-for-connection (&optional regexp)
1837   (nnimap-wait-for-line (or regexp "^[*.] .*\n") "[*.] \\([A-Z0-9]+\\)"))
1838
1839 (defun nnimap-wait-for-line (regexp &optional response-regexp)
1840   (let ((process (get-buffer-process (current-buffer))))
1841     (goto-char (point-min))
1842     (while (and (memq (process-status process)
1843                       '(open run))
1844                 (not (re-search-forward regexp nil t)))
1845       (nnheader-accept-process-output process)
1846       (goto-char (point-min)))
1847     (forward-line -1)
1848     (and (looking-at (or response-regexp regexp))
1849          (match-string 1))))
1850
1851 (defun nnimap-wait-for-response (sequence &optional messagep)
1852   (let ((process (get-buffer-process (current-buffer)))
1853         openp)
1854     (condition-case nil
1855         (progn
1856           (goto-char (point-max))
1857           (while (and (setq openp (memq (process-status process)
1858                                         '(open run)))
1859                       (progn
1860                         ;; Skip past any "*" lines that the server has
1861                         ;; output.
1862                         (while (and (not (bobp))
1863                                     (progn
1864                                       (forward-line -1)
1865                                       (looking-at "\\*"))))
1866                         (not (looking-at (format "%d .*\n" sequence)))))
1867             (when messagep
1868               (nnheader-message-maybe
1869                7 "nnimap read %dk from %s%s" (/ (buffer-size) 1000)
1870                nnimap-address
1871                (if (not (zerop (nnimap-initial-resync nnimap-object)))
1872                    (format " (initial sync of %d group%s; please wait)"
1873                            (nnimap-initial-resync nnimap-object)
1874                            (if (= (nnimap-initial-resync nnimap-object) 1)
1875                                ""
1876                              "s"))
1877                  "")))
1878             (nnheader-accept-process-output process)
1879             (goto-char (point-max)))
1880           (setf (nnimap-initial-resync nnimap-object) 0)
1881           openp)
1882       (quit
1883        (when debug-on-quit
1884          (debug "Quit"))
1885        ;; The user hit C-g while we were waiting: kill the process, in case
1886        ;; it's a gnutls-cli process that's stuck (tends to happen a lot behind
1887        ;; NAT routers).
1888        (delete-process process)
1889        nil))))
1890
1891 (defun nnimap-parse-response ()
1892   (let ((lines (split-string (nnimap-last-response-string) "\r\n" t))
1893         result)
1894     (dolist (line lines)
1895       (push (cdr (nnimap-parse-line line)) result))
1896     ;; Return the OK/error code first, and then all the "continuation
1897     ;; lines" afterwards.
1898     (cons (pop result)
1899           (nreverse result))))
1900
1901 ;; Parse an IMAP response line lightly.  They look like
1902 ;; "* OK [UIDVALIDITY 1164213559] UIDs valid", typically, so parse
1903 ;; the lines into a list of strings and lists of string.
1904 (defun nnimap-parse-line (line)
1905   (let (char result)
1906     (with-temp-buffer
1907       (mm-disable-multibyte)
1908       (insert line)
1909       (goto-char (point-min))
1910       (while (not (eobp))
1911         (if (eql (setq char (following-char)) ? )
1912             (forward-char 1)
1913           (push
1914            (cond
1915             ((eql char ?\[)
1916              (split-string
1917               (buffer-substring
1918                (1+ (point))
1919                (if (search-forward "]" (line-end-position) 'move)
1920                    (1- (point))
1921                  (point)))))
1922             ((eql char ?\()
1923              (split-string
1924               (buffer-substring
1925                (1+ (point))
1926                (if (search-forward ")" (line-end-position) 'move)
1927                    (1- (point))
1928                  (point)))))
1929             ((eql char ?\")
1930              (forward-char 1)
1931              (buffer-substring
1932               (point)
1933               (1- (or (search-forward "\"" (line-end-position) 'move)
1934                       (point)))))
1935             (t
1936              (buffer-substring (point) (if (search-forward " " nil t)
1937                                            (1- (point))
1938                                          (goto-char (point-max))))))
1939            result)))
1940       (nreverse result))))
1941
1942 (defun nnimap-last-response-string ()
1943   (save-excursion
1944     (forward-line 1)
1945     (let ((end (point)))
1946       (forward-line -1)
1947       (when (not (bobp))
1948         (forward-line -1)
1949         (while (and (not (bobp))
1950                     (eql (following-char) ?*))
1951           (forward-line -1))
1952         (unless (eql (following-char) ?*)
1953           (forward-line 1)))
1954       (buffer-substring (point) end))))
1955
1956 (defvar nnimap-incoming-split-list nil)
1957
1958 (defun nnimap-fetch-inbox (articles)
1959   (erase-buffer)
1960   (nnimap-wait-for-response
1961    (nnimap-send-command
1962     "UID FETCH %s %s"
1963     (nnimap-article-ranges articles)
1964     (format "(UID %s%s)"
1965             (format
1966              (if (nnimap-ver4-p)
1967                  "BODY.PEEK"
1968                "RFC822.PEEK"))
1969             (cond
1970              (nnimap-split-download-body-default
1971               "[]")
1972              ((nnimap-ver4-p)
1973               "[HEADER]")
1974              (t
1975               "[1]"))))
1976    t))
1977
1978 (defun nnimap-split-incoming-mail ()
1979   (with-current-buffer (nnimap-buffer)
1980     (let ((nnimap-incoming-split-list nil)
1981           (nnmail-split-methods
1982            (cond
1983             ((eq nnimap-split-methods 'default)
1984              nnmail-split-methods)
1985             (nnimap-split-methods
1986              nnimap-split-methods)
1987             (nnimap-split-fancy
1988              'nnmail-split-fancy)))
1989           (nnmail-split-fancy (or nnimap-split-fancy
1990                                   nnmail-split-fancy))
1991           (nnmail-inhibit-default-split-group t)
1992           (groups (nnimap-get-groups))
1993           new-articles)
1994       (erase-buffer)
1995       (nnimap-command "SELECT %S" nnimap-inbox)
1996       (setf (nnimap-group nnimap-object) nnimap-inbox)
1997       (setq new-articles (nnimap-new-articles (nnimap-get-flags "1:*")))
1998       (when new-articles
1999         (nnimap-fetch-inbox new-articles)
2000         (nnimap-transform-split-mail)
2001         (nnheader-ms-strip-cr)
2002         (nnmail-cache-open)
2003         (nnmail-split-incoming (current-buffer)
2004                                #'nnimap-save-mail-spec
2005                                nil nil
2006                                #'nnimap-dummy-active-number
2007                                #'nnimap-save-mail-spec)
2008         (when nnimap-incoming-split-list
2009           (let ((specs (nnimap-make-split-specs nnimap-incoming-split-list))
2010                 sequences junk-articles)
2011             ;; Create any groups that doesn't already exist on the
2012             ;; server first.
2013             (dolist (spec specs)
2014               (when (and (not (member (car spec) groups))
2015                          (not (eq (car spec) 'junk)))
2016                 (nnimap-command "CREATE %S" (utf7-encode (car spec) t))))
2017             ;; Then copy over all the messages.
2018             (erase-buffer)
2019             (dolist (spec specs)
2020               (let ((group (car spec))
2021                     (ranges (cdr spec)))
2022                 (if (eq group 'junk)
2023                     (setq junk-articles ranges)
2024                   (push (list (nnimap-send-command
2025                                "UID COPY %s %S"
2026                                (nnimap-article-ranges ranges)
2027                                (utf7-encode group t))
2028                               ranges)
2029                         sequences))))
2030             ;; Wait for the last COPY response...
2031             (when sequences
2032               (nnimap-wait-for-response (caar sequences))
2033               ;; And then mark the successful copy actions as deleted,
2034               ;; and possibly expunge them.
2035               (nnimap-mark-and-expunge-incoming
2036                (nnimap-parse-copied-articles sequences)))
2037             (nnimap-mark-and-expunge-incoming junk-articles)))))))
2038
2039 (defun nnimap-mark-and-expunge-incoming (range)
2040   (when range
2041     (setq range (nnimap-article-ranges range))
2042     (erase-buffer)
2043     (let ((sequence
2044            (nnimap-send-command
2045             "UID STORE %s +FLAGS.SILENT (\\Deleted)" range)))
2046       (cond
2047        ;; If the server supports it, we now delete the message we have
2048        ;; just copied over.
2049        ((nnimap-capability "UIDPLUS")
2050         (setq sequence (nnimap-send-command "UID EXPUNGE %s" range)))
2051        ;; If it doesn't support UID EXPUNGE, then we only expunge if the
2052        ;; user has configured it.
2053        (nnimap-expunge
2054         (setq sequence (nnimap-send-command "EXPUNGE"))))
2055       (nnimap-wait-for-response sequence))))
2056
2057 (defun nnimap-parse-copied-articles (sequences)
2058   (let (sequence copied range)
2059     (goto-char (point-min))
2060     (while (re-search-forward "^\\([0-9]+\\) OK\\b" nil t)
2061       (setq sequence (string-to-number (match-string 1)))
2062       (when (setq range (cadr (assq sequence sequences)))
2063         (push (gnus-uncompress-range range) copied)))
2064     (gnus-compress-sequence (sort (apply #'nconc copied) #'<))))
2065
2066 (defun nnimap-new-articles (flags)
2067   (let (new)
2068     (dolist (elem flags)
2069       (unless (gnus-list-memq-of-list nnimap-unsplittable-articles
2070                                       (cdr elem))
2071         (push (car elem) new)))
2072     (gnus-compress-sequence (nreverse new))))
2073
2074 (defun nnimap-make-split-specs (list)
2075   (let ((specs nil)
2076         entry)
2077     (dolist (elem list)
2078       (destructuring-bind (article spec) elem
2079         (dolist (group (delete nil (mapcar #'car spec)))
2080           (unless (setq entry (assoc group specs))
2081             (push (setq entry (list group)) specs))
2082           (setcdr entry (cons article (cdr entry))))))
2083     (dolist (entry specs)
2084       (setcdr entry (gnus-compress-sequence (sort (cdr entry) #'<))))
2085     specs))
2086
2087 (defun nnimap-transform-split-mail ()
2088   (goto-char (point-min))
2089   (let (article bytes)
2090     (block nil
2091       (while (not (eobp))
2092         (while (not (looking-at "\\* [0-9]+ FETCH.+UID \\([0-9]+\\)"))
2093           (delete-region (point) (progn (forward-line 1) (point)))
2094           (when (eobp)
2095             (return)))
2096         (setq article (match-string 1)
2097               bytes (nnimap-get-length))
2098         (delete-region (line-beginning-position) (line-end-position))
2099         ;; Insert MMDF separator, and a way to remember what this
2100         ;; article UID is.
2101         (insert (format "\^A\^A\^A\^A\n\nX-nnimap-article: %s" article))
2102         (forward-char (1+ bytes))
2103         (setq bytes (nnimap-get-length))
2104         (delete-region (line-beginning-position) (line-end-position))
2105         ;; There's a body; skip past that.
2106         (when bytes
2107           (forward-char (1+ bytes))
2108           (delete-region (line-beginning-position) (line-end-position)))))))
2109
2110 (defun nnimap-dummy-active-number (group &optional server)
2111   1)
2112
2113 (defun nnimap-save-mail-spec (group-art &optional server full-nov)
2114   (let (article)
2115     (goto-char (point-min))
2116     (if (not (re-search-forward "X-nnimap-article: \\([0-9]+\\)" nil t))
2117         (error "Invalid nnimap mail")
2118       (setq article (string-to-number (match-string 1))))
2119     (push (list article
2120                 (if (eq group-art 'junk)
2121                     (list (cons 'junk 1))
2122                   group-art))
2123           nnimap-incoming-split-list)))
2124
2125 (defun nnimap-make-thread-query (header)
2126   (let* ((id  (mail-header-id header))
2127          (refs (split-string
2128                 (or (mail-header-references header)
2129                     "")))
2130          (value
2131           (format
2132            "(OR HEADER REFERENCES %S HEADER Message-Id %S)"
2133            id id)))
2134     (dolist (refid refs value)
2135       (setq value (format
2136                    "(OR (OR HEADER Message-Id %S HEADER REFERENCES %S) %s)"
2137                    refid refid value)))))
2138
2139
2140 (provide 'nnimap)
2141
2142 ;;; nnimap.el ends here