lisp/gnus/nnimap.el

   1 ;;; nnimap.el --- IMAP interface for Gnus
   2
   3 ;; Copyright (C) 2010-2017 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 <https://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; nnimap interfaces Gnus with IMAP servers.
  26
  27 ;;; Code:
  28
  29 (eval-when-compile
  30   (require 'cl)
  31   (require 'subr-x))
  32
  33 (require 'nnheader)
  34 (require 'gnus-util)
  35 (require 'gnus)
  36 (require 'nnoo)
  37 (require 'netrc)
  38 (require 'utf7)
  39 (require 'tls)
  40 (require 'parse-time)
  41 (require 'nnmail)
  42
  43 (autoload 'auth-source-forget+ "auth-source")
  44 (autoload 'auth-source-search "auth-source")
  45
  46 (nnoo-declare nnimap)
  47
  48 (defvoo nnimap-address nil
  49   "The address of the IMAP server.")
  50
  51 (defvoo nnimap-user nil
  52   "Username to use for authentication to the IMAP server.")
  53
  54 (defvoo nnimap-server-port nil
  55   "The IMAP port used.
  56 If nnimap-stream is `ssl', this will default to `imaps'.  If not,
  57 it will default to `imap'.")
  58
  59 (defvoo nnimap-stream 'undecided
  60   "How nnimap talks to the IMAP server.
  61 The value should be either `undecided', `ssl' or `tls',
  62 `network', `starttls', `plain', or `shell'.
  63
  64 If the value is `undecided', nnimap tries `ssl' first, then falls
  65 back on `network'.")
  66
  67 (defvoo nnimap-shell-program (if (boundp 'imap-shell-program)
  68                                  (if (listp imap-shell-program)
  69                                      (car imap-shell-program)
  70                                    imap-shell-program)
  71                                "ssh %s imapd")
  72   "What command to execute to connect to an IMAP server.
  73 This will only be used if the connection type is `shell'.  See
  74 the `open-network-stream' documentation for an explanation of
  75 the format.")
  76
  77 (defvoo nnimap-inbox nil
  78   "The mail box where incoming mail arrives and should be split out of.
  79 This can be a string or a list of strings
  80 For example, \"INBOX\" or (\"INBOX\" \"SENT\").")
  81
  82 (defvoo nnimap-split-methods nil
  83   "How mail is split.
  84 Uses the same syntax as `nnmail-split-methods'.")
  85
  86 (defvoo nnimap-split-fancy nil
  87   "Uses the same syntax as `nnmail-split-fancy'.")
  88
  89 (defvoo nnimap-unsplittable-articles '(%Deleted %Seen)
  90   "Articles with the flags in the list will not be considered when splitting.")
  91
  92 (make-obsolete-variable 'nnimap-split-rule "see `nnimap-split-methods'."
  93                         "Emacs 24.1")
  94
  95 (defvoo nnimap-authenticator nil
  96   "How nnimap authenticate itself to the server.
  97 Possible choices are nil (use default methods), `anonymous',
  98 `login', `plain' and `cram-md5'.")
  99
 100 (defvoo nnimap-expunge t
 101   "If non-nil, expunge articles after deleting them.
 102 This is always done if the server supports UID EXPUNGE, but it's
 103 not done by default on servers that doesn't support that command.")
 104
 105 (defvoo nnimap-streaming t
 106   "If non-nil, try to use streaming commands with IMAP servers.
 107 Switching this off will make nnimap slower, but it helps with
 108 some servers.")
 109
 110 (defvoo nnimap-connection-alist nil)
 111
 112 (defvoo nnimap-current-infos nil)
 113
 114 (defun nnimap-decode-gnus-group (group)
 115   (decode-coding-string group 'utf-8))
 116
 117 (defun nnimap-encode-gnus-group (group)
 118   (encode-coding-string group 'utf-8))
 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 '(choice (const nil) integer)
 134   :version "24.4"
 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     ("MOVE" "Dovecot" nil)))
 167
 168 (defvar nnimap-inhibit-logging nil)
 169
 170 (defun nnimap-buffer ()
 171   (nnimap-find-process-buffer nntp-server-buffer))
 172
 173 (defun nnimap-header-parameters ()
 174   (let (params)
 175     (push "UID" params)
 176     (push "RFC822.SIZE" params)
 177     (when (nnimap-capability "X-GM-EXT-1")
 178       (push "X-GM-LABELS" params))
 179     (push "BODYSTRUCTURE" params)
 180     (push (format
 181            (if (nnimap-ver4-p)
 182                "BODY.PEEK[HEADER.FIELDS %s]"
 183              "RFC822.HEADER.LINES %s")
 184            (append '(Subject From Date Message-Id
 185                              References In-Reply-To Xref)
 186                    nnmail-extra-headers))
 187           params)
 188     (format "%s" (nreverse params))))
 189
 190 (deffoo nnimap-retrieve-headers (articles &optional group server _fetch-old)
 191   (when group
 192     (setq group (nnimap-decode-gnus-group group)))
 193   (with-current-buffer nntp-server-buffer
 194     (erase-buffer)
 195     (when (nnimap-change-group group server)
 196       (with-current-buffer (nnimap-buffer)
 197         (erase-buffer)
 198         (nnimap-wait-for-response
 199          (nnimap-send-command
 200           "UID FETCH %s %s"
 201           (nnimap-article-ranges (gnus-compress-sequence articles))
 202           (nnimap-header-parameters))
 203          t)
 204         (unless (process-live-p (get-buffer-process (current-buffer)))
 205           (error "Server closed connection"))
 206         (nnimap-transform-headers)
 207         (nnheader-remove-cr-followed-by-lf))
 208       (insert-buffer-substring
 209        (nnimap-find-process-buffer (current-buffer))))
 210     'headers))
 211
 212 (defun nnimap-transform-headers ()
 213   (goto-char (point-min))
 214   (let (article lines size string labels)
 215     (block nil
 216       (while (not (eobp))
 217         (while (not (looking-at "\\* [0-9]+ FETCH"))
 218           (delete-region (point) (progn (forward-line 1) (point)))
 219           (when (eobp)
 220             (return)))
 221         (goto-char (match-end 0))
 222         ;; Unfold quoted {number} strings.
 223         (while (re-search-forward
 224                 "[^]][ (]{\\([0-9]+\\)}\r?\n"
 225                 (save-excursion
 226                   ;; Start of the header section.
 227                   (or (re-search-forward "] {[0-9]+}\r?\n" nil t)
 228                       ;; Start of the next FETCH.
 229                       (re-search-forward "\\* [0-9]+ FETCH" nil t)
 230                       (point-max)))
 231                 t)
 232           (setq size (string-to-number (match-string 1)))
 233           (delete-region (+ (match-beginning 0) 2) (point))
 234           (setq string (buffer-substring (point) (+ (point) size)))
 235           (delete-region (point) (+ (point) size))
 236           (insert (format "%S" (subst-char-in-string ?\n ?\s string))))
 237         (beginning-of-line)
 238         (setq article
 239               (and (re-search-forward "UID \\([0-9]+\\)" (line-end-position)
 240                                       t)
 241                    (match-string 1)))
 242         (setq lines nil)
 243         (beginning-of-line)
 244         (setq size
 245               (and (re-search-forward "RFC822.SIZE \\([0-9]+\\)"
 246                                       (line-end-position)
 247                                       t)
 248                    (match-string 1)))
 249         (beginning-of-line)
 250         (when (search-forward "X-GM-LABELS" (line-end-position) t)
 251           (setq labels (ignore-errors (read (current-buffer)))))
 252         (beginning-of-line)
 253         (when (search-forward "BODYSTRUCTURE" (line-end-position) t)
 254           (let ((structure (ignore-errors
 255                              (read (current-buffer)))))
 256             (while (and (consp structure)
 257                         (not (atom (car structure))))
 258               (setq structure (car structure)))
 259             (setq lines (if (and
 260                              (stringp (car structure))
 261                              (equal (upcase (nth 0 structure)) "MESSAGE")
 262                              (equal (upcase (nth 1 structure)) "RFC822"))
 263                             (nth 9 structure)
 264                           (nth 7 structure)))))
 265         (delete-region (line-beginning-position) (line-end-position))
 266         (insert (format "211 %s Article retrieved." article))
 267         (forward-line 1)
 268         (when size
 269           (insert (format "Chars: %s\n" size)))
 270         (when lines
 271           (insert (format "Lines: %s\n" lines)))
 272         (when labels
 273           (insert (format "X-GM-LABELS: %s\n" labels)))
 274         ;; Most servers have a blank line after the headers, but
 275         ;; Davmail doesn't.
 276         (unless (re-search-forward "^\r$\\|^)\r?$" nil t)
 277           (goto-char (point-max)))
 278         (delete-region (line-beginning-position) (line-end-position))
 279         (insert ".")
 280         (forward-line 1)))))
 281
 282 (defun nnimap-unfold-quoted-lines ()
 283   ;; Unfold quoted {number} strings.
 284   (let (size string)
 285     (while (re-search-forward " {\\([0-9]+\\)}\r?\n" nil t)
 286       (setq size (string-to-number (match-string 1)))
 287       (delete-region (1+ (match-beginning 0)) (point))
 288       (setq string (buffer-substring (point) (+ (point) size)))
 289       (delete-region (point) (+ (point) size))
 290       (insert (format "%S" string)))))
 291
 292 (defun nnimap-get-length ()
 293   (and (re-search-forward "{\\([0-9]+\\)}" (line-end-position) t)
 294        (string-to-number (match-string 1))))
 295
 296 (defun nnimap-article-ranges (ranges)
 297   (let (result)
 298     (cond
 299      ((numberp ranges)
 300       (number-to-string ranges))
 301      ((numberp (cdr ranges))
 302       (format "%d:%d" (car ranges) (cdr ranges)))
 303      (t
 304       (dolist (elem ranges)
 305         (push
 306          (if (consp elem)
 307              (format "%d:%d" (car elem) (cdr elem))
 308            (number-to-string elem))
 309          result))
 310       (mapconcat #'identity (nreverse result) ",")))))
 311
 312 (deffoo nnimap-open-server (server &optional defs no-reconnect)
 313   (if (nnimap-server-opened server)
 314       t
 315     (unless (assq 'nnimap-address defs)
 316       (setq defs (append defs (list (list 'nnimap-address server)))))
 317     (nnoo-change-server 'nnimap server defs)
 318     (if no-reconnect
 319         (nnimap-find-connection nntp-server-buffer)
 320       (or (nnimap-find-connection nntp-server-buffer)
 321           (nnimap-open-connection nntp-server-buffer)))))
 322
 323 (defun nnimap-make-process-buffer (buffer)
 324   (with-current-buffer
 325       (generate-new-buffer (format " *nnimap %s %s %s*"
 326                                    nnimap-address nnimap-server-port
 327                                    (gnus-buffer-exists-p buffer)))
 328     (mm-disable-multibyte)
 329     (buffer-disable-undo)
 330     (gnus-add-buffer)
 331     (set (make-local-variable 'after-change-functions) nil)
 332     (set (make-local-variable 'nnimap-object)
 333          (make-nnimap :server (nnoo-current-server 'nnimap)
 334                       :initial-resync 0))
 335     (push (list buffer (current-buffer)) nnimap-connection-alist)
 336     (push (current-buffer) nnimap-process-buffers)
 337     (current-buffer)))
 338
 339 (defvar auth-source-creation-prompts)
 340
 341 (defun nnimap-credentials (address ports user)
 342   (let* ((auth-source-creation-prompts
 343           '((user  . "IMAP user at %h: ")
 344             (secret . "IMAP password for %u@%h: ")))
 345          (found (nth 0 (auth-source-search :max 1
 346                                            :host address
 347                                            :port ports
 348                                            :user user
 349                                            :require '(:user :secret)
 350                                            :create t))))
 351     (if found
 352         (list (plist-get found :user)
 353               (let ((secret (plist-get found :secret)))
 354                 (if (functionp secret)
 355                     (funcall secret)
 356                   secret))
 357               (plist-get found :save-function))
 358       nil)))
 359
 360 (defun nnimap-keepalive ()
 361   (let ((now (current-time)))
 362     (dolist (buffer nnimap-process-buffers)
 363       (when (buffer-name buffer)
 364         (with-current-buffer buffer
 365           (when (and nnimap-object
 366                      (nnimap-last-command-time nnimap-object)
 367                      (> (float-time
 368                          (time-subtract
 369                           now
 370                           (nnimap-last-command-time nnimap-object)))
 371                         ;; More than five minutes since the last command.
 372                         (* 5 60)))
 373             (ignore-errors              ;E.g. "buffer foo has no process".
 374               (nnimap-send-command "NOOP"))))))))
 375
 376 (defun nnimap-open-connection (buffer)
 377   ;; Be backwards-compatible -- the earlier value of nnimap-stream was
 378   ;; `ssl' when nnimap-server-port was nil.  Sort of.
 379   (when (and nnimap-server-port
 380              (eq nnimap-stream 'undecided))
 381     (setq nnimap-stream 'ssl))
 382   (let ((stream
 383          (if (eq nnimap-stream 'undecided)
 384              (loop for type in '(ssl network)
 385                    for stream = (let ((nnimap-stream type))
 386                                   (nnimap-open-connection-1 buffer))
 387                    while (eq stream 'no-connect)
 388                    finally (return stream))
 389            (nnimap-open-connection-1 buffer))))
 390     (if (eq stream 'no-connect)
 391         nil
 392       stream)))
 393
 394 (defun nnimap-map-port (port)
 395   (if (equal port "imaps")
 396       "993"
 397     port))
 398
 399 (defun nnimap-open-connection-1 (buffer)
 400   (unless nnimap-keepalive-timer
 401     (setq nnimap-keepalive-timer (run-at-time (* 60 15) (* 60 15)
 402                                               #'nnimap-keepalive)))
 403   (with-current-buffer (nnimap-make-process-buffer buffer)
 404     (let* ((coding-system-for-read 'binary)
 405            (coding-system-for-write 'binary)
 406            (ports
 407             (cond
 408              ((memq nnimap-stream '(network plain starttls))
 409               (nnheader-message 7 "Opening connection to %s..."
 410                                 nnimap-address)
 411               '("imap" "143"))
 412              ((eq nnimap-stream 'shell)
 413               (nnheader-message 7 "Opening connection to %s via shell..."
 414                                 nnimap-address)
 415               '("imap"))
 416              ((memq nnimap-stream '(ssl tls))
 417               (nnheader-message 7 "Opening connection to %s via tls..."
 418                                 nnimap-address)
 419               '("imaps" "imap" "993" "143"))
 420              (t
 421               (error "Unknown stream type: %s" nnimap-stream))))
 422            login-result credentials)
 423       (when nnimap-server-port
 424         (push nnimap-server-port ports))
 425       (let* ((stream-list
 426               (open-network-stream
 427                "*nnimap*" (current-buffer) nnimap-address
 428                (nnimap-map-port (car ports))
 429                :type nnimap-stream
 430                :warn-unless-encrypted t
 431                :return-list t
 432                :shell-command nnimap-shell-program
 433                :capability-command "1 CAPABILITY\r\n"
 434                :always-query-capabilities t
 435                :end-of-command "\r\n"
 436                :success " OK "
 437                :starttls-function
 438                (lambda (capabilities)
 439                  (when (string-match-p "STARTTLS" capabilities)
 440                    "1 STARTTLS\r\n"))))
 441              (stream (car stream-list))
 442              (props (cdr stream-list))
 443              (greeting (plist-get props :greeting))
 444              (capabilities (plist-get props :capabilities))
 445              (stream-type (plist-get props :type)))
 446         (when (and stream (not (memq (process-status stream) '(open run))))
 447           (setq stream nil))
 448
 449         (when (eq (process-type stream) 'network)
 450           ;; Use TCP-keepalive so that connections that pass through a NAT
 451           ;; router don't hang when left idle.
 452           (set-network-process-option stream :keepalive t))
 453
 454         (setf (nnimap-process nnimap-object) stream)
 455         (setf (nnimap-stream-type nnimap-object) stream-type)
 456         (if (not stream)
 457             (progn
 458               (nnheader-report 'nnimap "Unable to contact %s:%s via %s"
 459                                nnimap-address (car ports) nnimap-stream)
 460               'no-connect)
 461           (set-process-query-on-exit-flag stream nil)
 462           (if (not (string-match-p "[*.] \\(OK\\|PREAUTH\\)" greeting))
 463               (nnheader-report 'nnimap "%s" greeting)
 464             ;; Store the greeting (for debugging purposes).
 465             (setf (nnimap-greeting nnimap-object) greeting)
 466             (setf (nnimap-capabilities nnimap-object)
 467                   (mapcar #'upcase
 468                           (split-string capabilities)))
 469             (unless (string-match-p "[*.] PREAUTH" greeting)
 470               (if (not (setq credentials
 471                              (if (eq nnimap-authenticator 'anonymous)
 472                                  (list "anonymous"
 473                                        (message-make-address))
 474                                ;; Look for the credentials based on
 475                                ;; the virtual server name and the address
 476                                (nnimap-credentials
 477                                 (gnus-delete-duplicates
 478                                  (list
 479                                   (nnoo-current-server 'nnimap)
 480                                   nnimap-address))
 481                                 ports
 482                                 nnimap-user))))
 483                   (setq nnimap-object nil)
 484                 (let ((nnimap-inhibit-logging t))
 485                   (setq login-result
 486                         (nnimap-login (car credentials) (cadr credentials))))
 487                 (if (car login-result)
 488                     (progn
 489                       ;; Save the credentials if a save function exists
 490                       ;; (such a function will only be passed if a new
 491                       ;; token was created).
 492                       (when (functionp (nth 2 credentials))
 493                         (funcall (nth 2 credentials)))
 494                       ;; See if CAPABILITY is set as part of login
 495                       ;; response.
 496                       (dolist (response (cddr (nnimap-command "CAPABILITY")))
 497                         (when (string= "CAPABILITY" (upcase (car response)))
 498                           (setf (nnimap-capabilities nnimap-object)
 499                                 (mapcar #'upcase (cdr response))))))
 500                   ;; If the login failed, then forget the credentials
 501                   ;; that are now possibly cached.
 502                   (dolist (host (list (nnoo-current-server 'nnimap)
 503                                       nnimap-address))
 504                     (dolist (port ports)
 505                       (auth-source-forget+ :host host :port port)))
 506                   (delete-process (nnimap-process nnimap-object))
 507                   (setq nnimap-object nil))))
 508             (when nnimap-object
 509               (when (nnimap-capability "QRESYNC")
 510                 (nnimap-command "ENABLE QRESYNC"))
 511               (nnheader-message 7 "Opening connection to %s...done"
 512                                 nnimap-address)
 513               (nnimap-process nnimap-object))))))))
 514
 515 (autoload 'rfc2104-hash "rfc2104")
 516
 517 (defun nnimap-login (user password)
 518   (cond
 519    ;; Prefer plain LOGIN if it's enabled (since it requires fewer
 520    ;; round trips than CRAM-MD5, and it's less likely to be buggy),
 521    ;; and we're using an encrypted connection.
 522    ((and (not (nnimap-capability "LOGINDISABLED"))
 523          (eq (nnimap-stream-type nnimap-object) 'tls)
 524          (or (null nnimap-authenticator)
 525              (eq nnimap-authenticator 'login)))
 526     (nnimap-command "LOGIN %S %S" user password))
 527    ((and (nnimap-capability "AUTH=CRAM-MD5")
 528          (or (null nnimap-authenticator)
 529              (eq nnimap-authenticator 'cram-md5)))
 530     (erase-buffer)
 531     (let ((sequence (nnimap-send-command "AUTHENTICATE CRAM-MD5"))
 532           (challenge (nnimap-wait-for-line "^\\+\\(.*\\)\n")))
 533       (process-send-string
 534        (get-buffer-process (current-buffer))
 535        (concat
 536         (base64-encode-string
 537          (concat user " "
 538                  (rfc2104-hash 'md5 64 16 password
 539                                (base64-decode-string challenge))))
 540         "\r\n"))
 541       (nnimap-wait-for-response sequence)))
 542    ((and (not (nnimap-capability "LOGINDISABLED"))
 543          (or (null nnimap-authenticator)
 544              (eq nnimap-authenticator 'login)))
 545     (nnimap-command "LOGIN %S %S" user password))
 546    ((and (nnimap-capability "AUTH=PLAIN")
 547          (or (null nnimap-authenticator)
 548              (eq nnimap-authenticator 'plain)))
 549     (nnimap-command
 550      "AUTHENTICATE PLAIN %s"
 551      (base64-encode-string
 552       (format "\000%s\000%s"
 553               (nnimap-quote-specials user)
 554               (nnimap-quote-specials password)))))))
 555
 556 (defun nnimap-quote-specials (string)
 557   (with-temp-buffer
 558     (insert string)
 559     (goto-char (point-min))
 560     (while (re-search-forward "[\\\"]" nil t)
 561       (forward-char -1)
 562       (insert "\\")
 563       (forward-char 1))
 564     (buffer-string)))
 565
 566 (defun nnimap-find-parameter (parameter elems)
 567   (let (result)
 568     (dolist (elem elems)
 569       (cond
 570        ((equal (car elem) parameter)
 571         (setq result (cdr elem)))
 572        ((and (equal (car elem) "OK")
 573              (consp (cadr elem))
 574              (equal (caadr elem) parameter))
 575         (setq result (cdr (cadr elem))))))
 576     result))
 577
 578 (deffoo nnimap-close-server (&optional server)
 579   (when (nnoo-change-server 'nnimap server nil)
 580     (ignore-errors
 581       (delete-process (get-buffer-process (nnimap-buffer))))
 582     (nnoo-close-server 'nnimap server)
 583     t))
 584
 585 (deffoo nnimap-request-close ()
 586   t)
 587
 588 (deffoo nnimap-server-opened (&optional server)
 589   (and (nnoo-current-server-p 'nnimap server)
 590        nntp-server-buffer
 591        (gnus-buffer-live-p nntp-server-buffer)
 592        (nnimap-find-connection nntp-server-buffer)))
 593
 594 (deffoo nnimap-status-message (&optional _server)
 595   nnimap-status-string)
 596
 597 (deffoo nnimap-request-article (article &optional group server to-buffer)
 598   (when group
 599     (setq group (nnimap-decode-gnus-group group)))
 600   (with-current-buffer nntp-server-buffer
 601     (let ((result (nnimap-change-group group server))
 602           parts structure)
 603       (when (stringp article)
 604         (setq article (nnimap-find-article-by-message-id group server article)))
 605       (when (and result
 606                  article)
 607         (erase-buffer)
 608         (with-current-buffer (nnimap-buffer)
 609           (erase-buffer)
 610           (when nnimap-fetch-partial-articles
 611             (nnimap-command "UID FETCH %d (BODYSTRUCTURE)" article)
 612             (goto-char (point-min))
 613             (when (re-search-forward "FETCH.*BODYSTRUCTURE" nil t)
 614               (setq structure (ignore-errors
 615                                 (let ((start (point)))
 616                                   (forward-sexp 1)
 617                                   (downcase-region start (point))
 618                                   (goto-char start)
 619                                   (read (current-buffer))))
 620                     parts (nnimap-find-wanted-parts structure))))
 621           (when (if parts
 622                     (nnimap-get-partial-article article parts structure)
 623                   (nnimap-get-whole-article article))
 624             (let ((buffer (current-buffer)))
 625               (with-current-buffer (or to-buffer nntp-server-buffer)
 626                 (nnheader-insert-buffer-substring buffer)
 627                 (nnheader-ms-strip-cr)))
 628             (cons group article)))))))
 629
 630 (deffoo nnimap-request-head (article &optional group server to-buffer)
 631   (when group
 632     (setq group (nnimap-decode-gnus-group group)))
 633   (when (nnimap-change-group group server)
 634     (with-current-buffer (nnimap-buffer)
 635       (when (stringp article)
 636         (setq article (nnimap-find-article-by-message-id group server article)))
 637       (if (null article)
 638           nil
 639         (nnimap-get-whole-article
 640          article (format "UID FETCH %%d %s"
 641                          (nnimap-header-parameters)))
 642         (let ((buffer (current-buffer)))
 643           (with-current-buffer (or to-buffer nntp-server-buffer)
 644             (erase-buffer)
 645             (insert-buffer-substring buffer)
 646             (nnheader-ms-strip-cr)
 647             (cons group article)))))))
 648
 649 (deffoo nnimap-request-articles (articles &optional group server)
 650   (when group
 651     (setq group (nnimap-decode-gnus-group group)))
 652   (with-current-buffer nntp-server-buffer
 653     (let ((result (nnimap-change-group group server)))
 654       (when result
 655         (erase-buffer)
 656         (with-current-buffer (nnimap-buffer)
 657           (erase-buffer)
 658           (when (nnimap-command
 659                  (if (nnimap-ver4-p)
 660                      "UID FETCH %s BODY.PEEK[]"
 661                    "UID FETCH %s RFC822.PEEK")
 662                  (nnimap-article-ranges (gnus-compress-sequence articles)))
 663             (let ((buffer (current-buffer)))
 664               (with-current-buffer nntp-server-buffer
 665                 (nnheader-insert-buffer-substring buffer)
 666                 (nnheader-ms-strip-cr)))
 667             t))))))
 668
 669 (defun nnimap-get-whole-article (article &optional command)
 670   (let ((result
 671          (nnimap-command
 672           (or command
 673               (if (nnimap-ver4-p)
 674                   "UID FETCH %d BODY.PEEK[]"
 675                 "UID FETCH %d RFC822.PEEK"))
 676           article)))
 677     ;; Check that we really got an article.
 678     (goto-char (point-min))
 679     (unless (re-search-forward "\\* [0-9]+ FETCH" nil t)
 680       (setq result nil))
 681     (when result
 682       ;; Remove any data that may have arrived before the FETCH data.
 683       (beginning-of-line)
 684       (unless (bobp)
 685         (delete-region (point-min) (point)))
 686       (let ((bytes (nnimap-get-length)))
 687         (delete-region (line-beginning-position)
 688                        (progn (forward-line 1) (point)))
 689         (goto-char (+ (point) bytes))
 690         (delete-region (point) (point-max)))
 691       t)))
 692
 693 (defun nnimap-capability (capability)
 694   (member capability (nnimap-capabilities nnimap-object)))
 695
 696 (defun nnimap-ver4-p ()
 697   (nnimap-capability "IMAP4REV1"))
 698
 699 (defun nnimap-get-partial-article (article parts structure)
 700   (let ((result
 701          (nnimap-command
 702           "UID FETCH %d (%s %s)"
 703           article
 704           (if (nnimap-ver4-p)
 705               "BODY.PEEK[HEADER]"
 706             "RFC822.HEADER")
 707           (if (nnimap-ver4-p)
 708               (mapconcat (lambda (part)
 709                            (format "BODY.PEEK[%s]" part))
 710                          parts " ")
 711             (mapconcat (lambda (part)
 712                          (format "RFC822.PEEK[%s]" part))
 713                        parts " ")))))
 714     (when result
 715       (nnimap-convert-partial-article structure))))
 716
 717 (defun nnimap-convert-partial-article (structure)
 718   ;; First just skip past the headers.
 719   (goto-char (point-min))
 720   (let ((bytes (nnimap-get-length))
 721         id parts)
 722     ;; Delete "FETCH" line.
 723     (delete-region (line-beginning-position)
 724                    (progn (forward-line 1) (point)))
 725     (goto-char (+ (point) bytes))
 726     ;; Collect all the body parts.
 727     (while (looking-at ".*BODY\\[\\([.0-9]+\\)\\]")
 728       (setq id (match-string 1)
 729             bytes (or (nnimap-get-length) 0))
 730       (beginning-of-line)
 731       (delete-region (point) (progn (forward-line 1) (point)))
 732       (push (list id (buffer-substring (point) (+ (point) bytes)))
 733             parts)
 734       (delete-region (point) (+ (point) bytes)))
 735     ;; Delete trailing junk.
 736     (delete-region (point) (point-max))
 737     ;; Now insert all the parts again where they fit in the structure.
 738     (nnimap-insert-partial-structure structure parts)
 739     t))
 740
 741 (defun nnimap-insert-partial-structure (structure parts &optional subp)
 742   (let (type boundary)
 743     (let ((bstruc structure))
 744       (while (consp (car bstruc))
 745         (pop bstruc))
 746       (setq type (car bstruc))
 747       (setq bstruc (car (cdr bstruc)))
 748       (let ((has-boundary (member "boundary" bstruc)))
 749         (when has-boundary
 750           (setq boundary (cadr has-boundary)))))
 751     (when subp
 752       (insert (format "Content-type: multipart/%s; boundary=%S\n\n"
 753                       (downcase type) boundary)))
 754     (while (not (stringp (car structure)))
 755       (insert "\n--" boundary "\n")
 756       (if (consp (caar structure))
 757           (nnimap-insert-partial-structure (pop structure) parts t)
 758         (let ((bit (pop structure)))
 759           (insert (format "Content-type: %s/%s"
 760                           (downcase (nth 0 bit))
 761                           (downcase (nth 1 bit))))
 762           (if (member-ignore-case "CHARSET" (nth 2 bit))
 763               (insert (format
 764                        "; charset=%S\n"
 765                        (cadr (member-ignore-case "CHARSET" (nth 2 bit)))))
 766             (insert "\n"))
 767           (insert (format "Content-transfer-encoding: %s\n"
 768                           (nth 5 bit)))
 769           (insert "\n")
 770           (when (assoc (nth 9 bit) parts)
 771             (insert (cadr (assoc (nth 9 bit) parts)))))))
 772     (insert "\n--" boundary "--\n")))
 773
 774 (defun nnimap-find-wanted-parts (structure)
 775   (message-flatten-list (nnimap-find-wanted-parts-1 structure "")))
 776
 777 (defun nnimap-find-wanted-parts-1 (structure prefix)
 778   (let ((num 1)
 779         parts)
 780     (while (consp (car structure))
 781       (let ((sub (pop structure)))
 782         (if (consp (car sub))
 783             (push (nnimap-find-wanted-parts-1
 784                    sub (if (string= prefix "")
 785                            (number-to-string num)
 786                          (format "%s.%s" prefix num)))
 787                   parts)
 788           (let ((type (format "%s/%s" (nth 0 sub) (nth 1 sub)))
 789                 (id (if (string= prefix "")
 790                         (number-to-string num)
 791                       (format "%s.%s" prefix num))))
 792             (setcar (nthcdr 9 sub) id)
 793             (when (if (eq nnimap-fetch-partial-articles t)
 794                       (equal id "1")
 795                     (string-match nnimap-fetch-partial-articles type))
 796               (push id parts))))
 797         (incf num)))
 798     (nreverse parts)))
 799
 800 (deffoo nnimap-request-group (group &optional server dont-check info)
 801   (setq group (nnimap-decode-gnus-group group))
 802   (let ((result (nnimap-change-group
 803                  ;; Don't SELECT the group if we're going to select it
 804                  ;; later, anyway.
 805                  (if (and (not dont-check)
 806                           (assoc group nnimap-current-infos))
 807                      nil
 808                    group)
 809                  server))
 810         (info (when info (list info)))
 811         active)
 812     (with-current-buffer nntp-server-buffer
 813       (when result
 814         (when (or (not dont-check)
 815                   (not (setq active
 816                              (nth 2 (assoc group nnimap-current-infos)))))
 817           (let ((sequences (nnimap-retrieve-group-data-early
 818                             server info)))
 819             (nnimap-finish-retrieve-group-infos server info sequences
 820                                                 t)
 821             (setq active (nth 2 (assoc group nnimap-current-infos)))))
 822         (setq active (or active '(0 . 1)))
 823         (erase-buffer)
 824         (insert (format "211 %d %d %d %S\n"
 825                         (- (cdr active) (car active))
 826                         (car active)
 827                         (cdr active)
 828                         (nnimap-encode-gnus-group group)))
 829         t))))
 830
 831 (deffoo nnimap-request-group-scan (group &optional server info)
 832   (setq group (nnimap-decode-gnus-group group))
 833   (when (nnimap-change-group nil server)
 834     (let (marks high low)
 835       (with-current-buffer (nnimap-buffer)
 836         (erase-buffer)
 837         (let ((group-sequence
 838                (nnimap-send-command "SELECT %S" (utf7-encode group t)))
 839               (flag-sequence
 840                (nnimap-send-command "UID FETCH 1:* FLAGS")))
 841           (setf (nnimap-group nnimap-object) group)
 842           (nnimap-wait-for-response flag-sequence)
 843           (setq marks
 844                 (nnimap-flags-to-marks
 845                  (nnimap-parse-flags
 846                   (list (list group-sequence flag-sequence
 847                               1 group "SELECT")))))
 848           (when (and info
 849                      marks)
 850             (nnimap-update-infos marks (list info))
 851             (nnimap-store-info info (gnus-active (gnus-info-group info))))
 852           (goto-char (point-max))
 853           (let ((uidnext (nth 5 (car marks))))
 854             (setq high (or (if uidnext
 855                                (1- uidnext)
 856                              (nth 3 (car marks)))
 857                            0)
 858                   low (or (nth 4 (car marks)) uidnext 1)))))
 859       (with-current-buffer nntp-server-buffer
 860         (erase-buffer)
 861         (insert
 862          (format
 863           "211 %d %d %d %S\n" (1+ (- high low)) low high
 864           (nnimap-encode-gnus-group group)))
 865         t))))
 866
 867 (deffoo nnimap-request-create-group (group &optional server _args)
 868   (setq group (nnimap-decode-gnus-group group))
 869   (when (nnimap-change-group nil server)
 870     (with-current-buffer (nnimap-buffer)
 871       (car (nnimap-command "CREATE %S" (utf7-encode group t))))))
 872
 873 (deffoo nnimap-request-delete-group (group &optional _force server)
 874   (setq group (nnimap-decode-gnus-group group))
 875   (when (nnimap-change-group nil server)
 876     (with-current-buffer (nnimap-buffer)
 877       (car (nnimap-command "DELETE %S" (utf7-encode group t))))))
 878
 879 (deffoo nnimap-request-rename-group (group new-name &optional server)
 880   (setq group (nnimap-decode-gnus-group group))
 881   (when (nnimap-change-group nil server)
 882     (with-current-buffer (nnimap-buffer)
 883       (nnimap-unselect-group)
 884       (car (nnimap-command "RENAME %S %S"
 885                            (utf7-encode group t) (utf7-encode new-name t))))))
 886
 887 (defun nnimap-unselect-group ()
 888   ;; Make sure we don't have this group open read/write by asking
 889   ;; to examine a mailbox that doesn't exist.  This seems to be
 890   ;; the only way that allows us to reliably go back to unselected
 891   ;; state on Courier.
 892   (nnimap-command "EXAMINE DOES.NOT.EXIST"))
 893
 894 (deffoo nnimap-request-expunge-group (group &optional server)
 895   (setq group (nnimap-decode-gnus-group group))
 896   (when (nnimap-change-group group server)
 897     (with-current-buffer (nnimap-buffer)
 898       (car (nnimap-command "EXPUNGE")))))
 899
 900 (defun nnimap-get-flags (spec)
 901   (let ((articles nil)
 902         elems end)
 903     (with-current-buffer (nnimap-buffer)
 904       (erase-buffer)
 905       (nnimap-wait-for-response (nnimap-send-command
 906                                  "UID FETCH %s FLAGS" spec))
 907       (setq end (point))
 908       (subst-char-in-region (point-min) (point-max)
 909                             ?\\ ?% t)
 910       (goto-char (point-min))
 911       (while (search-forward " FETCH " end t)
 912         (setq elems (read (current-buffer)))
 913         (push (cons (cadr (memq 'UID elems))
 914                     (cadr (memq 'FLAGS elems)))
 915               articles)))
 916     (nreverse articles)))
 917
 918 (deffoo nnimap-close-group (_group &optional _server)
 919   t)
 920
 921 (deffoo nnimap-request-move-article (article group server accept-form
 922                                              &optional _last
 923                                              internal-move-group)
 924   (setq group (nnimap-decode-gnus-group group))
 925   (when internal-move-group
 926     (setq internal-move-group (nnimap-decode-gnus-group internal-move-group)))
 927   (with-temp-buffer
 928     (mm-disable-multibyte)
 929     (when (funcall (if internal-move-group
 930                        'nnimap-request-head
 931                      'nnimap-request-article)
 932                    article group server (current-buffer))
 933       ;; If the move is internal (on the same server), just do it the
 934       ;; easy way.
 935       (let ((message-id (message-field-value "message-id")))
 936         (if internal-move-group
 937             (with-current-buffer (nnimap-buffer)
 938               (let* ((can-move (and (nnimap-capability "MOVE")
 939                                     (equal (nnimap-quirk "MOVE") "MOVE")))
 940                      (command (if can-move
 941                                   "UID MOVE %d %S"
 942                                 "UID COPY %d %S"))
 943                      (result (nnimap-command
 944                               command article
 945                               (utf7-encode internal-move-group t))))
 946                 (when (and (car result) (not can-move))
 947                   (nnimap-delete-article article))
 948                 (cons internal-move-group
 949                       (or (nnimap-find-uid-response "COPYUID" (caddr result))
 950                           (nnimap-find-article-by-message-id
 951                            internal-move-group server message-id
 952                            nnimap-request-articles-find-limit)))))
 953           ;; Move the article to a different method.
 954           (when-let* ((result (eval accept-form)))
 955             (nnimap-change-group group server)
 956             (nnimap-delete-article article)
 957             result))))))
 958
 959 (deffoo nnimap-request-expire-articles (articles group &optional server force)
 960   (setq group (nnimap-decode-gnus-group group))
 961   (cond
 962    ((null articles)
 963     nil)
 964    ((not (nnimap-change-group group server))
 965     articles)
 966    ((and force
 967          (eq nnmail-expiry-target 'delete))
 968     (unless (nnimap-delete-article (gnus-compress-sequence articles))
 969       (nnheader-message 7 "Article marked for deletion, but not expunged."))
 970     nil)
 971    (t
 972     (let ((deletable-articles
 973            (if (or force
 974                    (eq nnmail-expiry-wait 'immediate))
 975                articles
 976              (gnus-sorted-intersection
 977               articles
 978               (nnimap-find-expired-articles group)))))
 979       (if (null deletable-articles)
 980           articles
 981         (if (eq nnmail-expiry-target 'delete)
 982             (nnimap-delete-article (gnus-compress-sequence deletable-articles))
 983           (setq deletable-articles
 984                 (nnimap-process-expiry-targets
 985                  deletable-articles group server)))
 986         ;; Return the articles we didn't delete.
 987         (gnus-sorted-complement articles deletable-articles))))))
 988
 989 (defun nnimap-process-expiry-targets (articles group server)
 990   (let ((deleted-articles nil)
 991         (articles-to-delete nil))
 992     (cond
 993      ;; shortcut further processing if we're going to delete the articles
 994      ((eq nnmail-expiry-target 'delete)
 995       (setq articles-to-delete articles)
 996       t)
 997      ;; or just move them to another folder on the same IMAP server
 998      ((and (not (functionp nnmail-expiry-target))
 999            (gnus-server-equal (gnus-group-method nnmail-expiry-target)
1000                               (gnus-server-to-method
1001                                (format "nnimap:%s" server))))
1002       (and (nnimap-change-group group server)
1003            (with-current-buffer (nnimap-buffer)
1004              (nnheader-message 7 "Expiring articles from %s: %s" group articles)
1005              (let ((can-move (and (nnimap-capability "MOVE")
1006                                   (equal (nnimap-quirk "MOVE") "MOVE"))))
1007                (nnimap-command
1008                 (if can-move
1009                     "UID MOVE %s %S"
1010                   "UID COPY %s %S")
1011                 (nnimap-article-ranges (gnus-compress-sequence articles))
1012                 (utf7-encode (gnus-group-real-name nnmail-expiry-target) t))
1013                (set (if can-move 'deleted-articles 'articles-to-delete) articles))))
1014       t)
1015      (t
1016       (dolist (article articles)
1017         (let ((target nnmail-expiry-target))
1018           (with-temp-buffer
1019             (mm-disable-multibyte)
1020             (when (nnimap-request-article article group server (current-buffer))
1021               (when (functionp target)
1022                 (setq target (funcall target group)))
1023               (if (and target
1024                        (not (eq target 'delete)))
1025                   (if (or (gnus-request-group target t)
1026                           (gnus-request-create-group target))
1027                       (progn
1028                         (nnmail-expiry-target-group target group)
1029                         (nnheader-message 7 "Expiring article %s:%d to %s"
1030                                           group article target))
1031                     (setq target nil))
1032                 (nnheader-message 7 "Expiring article %s:%d" group article))
1033               (when target
1034                 (push article articles-to-delete))))))
1035       (setq articles-to-delete (nreverse articles-to-delete))))
1036     ;; Change back to the current group again.
1037     (nnimap-change-group group server)
1038     (when articles-to-delete
1039       (nnimap-delete-article (gnus-compress-sequence articles-to-delete))
1040       (setq deleted-articles articles-to-delete))
1041     deleted-articles))
1042
1043 (defun nnimap-find-expired-articles (group)
1044   (let ((cutoff (nnmail-expired-article-p group nil nil)))
1045     (when cutoff
1046       (with-current-buffer (nnimap-buffer)
1047         (let ((result
1048                (nnimap-command
1049                 "UID SEARCH SENTBEFORE %s"
1050                 (format-time-string
1051                  (format "%%d-%s-%%Y"
1052                          (upcase
1053                           (car (rassoc (nth 4 (decode-time cutoff))
1054                                        parse-time-months))))
1055                  cutoff))))
1056           (and (car result)
1057                (delete 0 (mapcar #'string-to-number
1058                                  (cdr (assoc "SEARCH" (cdr result)))))))))))
1059
1060 (defun nnimap-find-article-by-message-id (group server message-id
1061                                                 &optional limit)
1062   "Search for message with MESSAGE-ID in GROUP from SERVER.
1063 If LIMIT, first try to limit the search to the N last articles."
1064   (with-current-buffer (nnimap-buffer)
1065     (erase-buffer)
1066     (let* ((change-group-result (nnimap-change-group group server nil t))
1067            (number-of-article
1068             (and (listp change-group-result)
1069                  (catch 'found
1070                    (dolist (result (cdr change-group-result))
1071                      (when (equal "EXISTS" (cadr result))
1072                        (throw 'found (car result)))))))
1073            (sequence
1074             (nnimap-send-command
1075              "UID SEARCH%s HEADER Message-Id %S"
1076              (if (and limit number-of-article)
1077                  ;; The -1 is because IMAP message
1078                  ;; numbers are one-based rather than
1079                  ;; zero-based.
1080                  (format " %s:*" (- (string-to-number number-of-article)
1081                                     limit -1))
1082                "")
1083              message-id)))
1084       (when (nnimap-wait-for-response sequence)
1085         (let ((article (car (last (cdr (assoc "SEARCH"
1086                                               (nnimap-parse-response)))))))
1087           (if article
1088               (string-to-number article)
1089             (when (and limit number-of-article)
1090               (nnimap-find-article-by-message-id group server message-id))))))))
1091
1092 (defun nnimap-delete-article (articles)
1093   (with-current-buffer (nnimap-buffer)
1094     (nnimap-command "UID STORE %s +FLAGS.SILENT (\\Deleted)"
1095                     (nnimap-article-ranges articles))
1096     (cond
1097      ((nnimap-capability "UIDPLUS")
1098       (nnimap-command "UID EXPUNGE %s"
1099                       (nnimap-article-ranges articles))
1100       t)
1101      (nnimap-expunge
1102       (nnimap-command "EXPUNGE")
1103       t)
1104      (t (gnus-message 7 (concat "nnimap: nnimap-expunge is not set and the "
1105                                 "server doesn't support UIDPLUS, so we won't "
1106                                 "delete this article now"))))))
1107
1108 (deffoo nnimap-request-scan (&optional group server)
1109   (when group
1110     (setq group (nnimap-decode-gnus-group group)))
1111   (when (and (nnimap-change-group nil server)
1112              nnimap-inbox
1113              nnimap-split-methods)
1114     (nnheader-message 7 "nnimap %s splitting mail..." server)
1115     (if (listp nnimap-inbox)
1116        (dolist (nnimap-inbox nnimap-inbox)
1117          (nnimap-split-incoming-mail))
1118       (nnimap-split-incoming-mail))
1119     (nnheader-message 7 "nnimap %s splitting mail...done" server)))
1120
1121 (defun nnimap-marks-to-flags (marks)
1122   (let (flags flag)
1123     (dolist (mark marks)
1124       (when (setq flag (cadr (assq mark nnimap-mark-alist)))
1125         (push flag flags)))
1126     flags))
1127
1128 (deffoo nnimap-request-update-group-status (group status &optional server)
1129   (setq group (nnimap-decode-gnus-group group))
1130   (when (nnimap-change-group nil server)
1131     (let ((command (assoc
1132                     status
1133                     '((subscribe "SUBSCRIBE")
1134                       (unsubscribe "UNSUBSCRIBE")))))
1135       (when command
1136         (with-current-buffer (nnimap-buffer)
1137           (nnimap-command "%s %S" (cadr command) (utf7-encode group t)))))))
1138
1139 (deffoo nnimap-request-set-mark (group actions &optional server)
1140   (setq group (nnimap-decode-gnus-group group))
1141   (when (nnimap-change-group group server)
1142     (let (sequence)
1143       (with-current-buffer (nnimap-buffer)
1144         (erase-buffer)
1145         ;; Just send all the STORE commands without waiting for
1146         ;; response.  If they're successful, they're successful.
1147         (dolist (action actions)
1148           (destructuring-bind (range action marks) action
1149             (let ((flags (nnimap-marks-to-flags marks)))
1150               (when flags
1151                 (setq sequence (nnimap-send-command
1152                                 "UID STORE %s %sFLAGS.SILENT (%s)"
1153                                 (nnimap-article-ranges range)
1154                                 (cond
1155                                  ((eq action 'del) "-")
1156                                  ((eq action 'add) "+")
1157                                  ((eq action 'set) ""))
1158                                 (mapconcat #'identity flags " ")))))))
1159         ;; Wait for the last command to complete to avoid later
1160         ;; synchronization problems with the stream.
1161         (when sequence
1162           (nnimap-wait-for-response sequence))))))
1163
1164 (deffoo nnimap-request-accept-article (group &optional server _last)
1165   (unless group
1166     ;; We're respooling.  Find out where mail splitting would place
1167     ;; this article.
1168     (setq group
1169           (caar
1170            (nnmail-article-group
1171             ;; We don't really care about the article number, because
1172             ;; that's determined by the IMAP server later.  So just
1173             ;; return the group name.
1174             `(lambda (group)
1175                (list (list group)))))))
1176   (setq group (nnimap-decode-gnus-group group))
1177   (when (nnimap-change-group nil server)
1178     (nnmail-check-syntax)
1179     (let ((message-id (message-field-value "message-id"))
1180           sequence message)
1181       (nnimap-add-cr)
1182       (setq message (buffer-substring-no-properties (point-min) (point-max)))
1183       (with-current-buffer (nnimap-buffer)
1184         (when (setq message (or (nnimap-process-quirk "OK Gimap " 'append message)
1185                                 message))
1186           ;; If we have this group open read-only, then unselect it
1187           ;; before appending to it.
1188           (when (equal (nnimap-examined nnimap-object) group)
1189             (nnimap-unselect-group))
1190           (erase-buffer)
1191           (setq sequence (nnimap-send-command
1192                           "APPEND %S {%d}" (utf7-encode group t)
1193                           (length message)))
1194           (unless nnimap-streaming
1195             (nnimap-wait-for-connection "^[+]"))
1196           (process-send-string (get-buffer-process (current-buffer)) message)
1197           (process-send-string (get-buffer-process (current-buffer))
1198                                (if (nnimap-newlinep nnimap-object)
1199                                    "\n"
1200                                  "\r\n"))
1201           (let ((result (nnimap-get-response sequence)))
1202             (if (not (nnimap-ok-p result))
1203                 (progn
1204                   (nnheader-report 'nnimap "%s" result)
1205                   nil)
1206               (cons group
1207                     (or (nnimap-find-uid-response "APPENDUID" (car result))
1208                         (nnimap-find-article-by-message-id
1209                          group server message-id
1210                          nnimap-request-articles-find-limit))))))))))
1211
1212 (defun nnimap-process-quirk (greeting-match type data)
1213   (when (and (nnimap-greeting nnimap-object)
1214              (string-match greeting-match (nnimap-greeting nnimap-object))
1215              (eq type 'append)
1216              (string-match "\000" data))
1217     (let ((choice (gnus-multiple-choice
1218                    "Message contains NUL characters.  Delete, continue, abort? "
1219                    '((?d "Delete NUL characters")
1220                      (?c "Try to APPEND the message as is")
1221                      (?a "Abort")))))
1222       (cond
1223        ((eq choice ?a)
1224         (nnheader-report 'nnimap "Aborted APPEND due to NUL characters"))
1225        ((eq choice ?c)
1226         data)
1227        (t
1228         (with-temp-buffer
1229           (insert data)
1230           (goto-char (point-min))
1231           (while (search-forward "\000" nil t)
1232             (replace-match "" t t))
1233           (buffer-string)))))))
1234
1235 (defun nnimap-ok-p (value)
1236   (and (consp value)
1237        (consp (car value))
1238        (equal (caar value) "OK")))
1239
1240 (defun nnimap-find-uid-response (name list)
1241   (let ((result (car (last (nnimap-find-response-element name list)))))
1242     (and result
1243          (string-to-number result))))
1244
1245 (defun nnimap-find-response-element (name list)
1246   (let (result)
1247     (dolist (elem list)
1248       (when (and (consp elem)
1249                  (equal name (car elem)))
1250         (setq result elem)))
1251     result))
1252
1253 (deffoo nnimap-request-replace-article (article group buffer)
1254   (setq group (nnimap-decode-gnus-group group))
1255   (let (group-art)
1256     (when (and (nnimap-change-group group)
1257                ;; Put the article into the group.
1258                (with-current-buffer buffer
1259                  (setq group-art
1260                        (nnimap-request-accept-article group nil t))))
1261       (nnimap-delete-article (list article))
1262       ;; Return the new article number.
1263       (cdr group-art))))
1264
1265 (defun nnimap-add-cr ()
1266   (goto-char (point-min))
1267   (while (re-search-forward "\r?\n" nil t)
1268     (replace-match "\r\n" t t)))
1269
1270 (defun nnimap-get-groups ()
1271   (erase-buffer)
1272   (let ((sequence (nnimap-send-command "LIST \"\" \"*\""))
1273         groups)
1274     (nnimap-wait-for-response sequence)
1275     (subst-char-in-region (point-min) (point-max)
1276                           ?\\ ?% t)
1277     (goto-char (point-min))
1278     (nnimap-unfold-quoted-lines)
1279     (goto-char (point-min))
1280     (while (search-forward "* LIST " nil t)
1281       (let ((flags (read (current-buffer)))
1282             (_separator (read (current-buffer)))
1283             (group (buffer-substring-no-properties
1284                     (progn (skip-chars-forward " \"")
1285                            (point))
1286                     (progn (end-of-line)
1287                            (skip-chars-backward " \r\"")
1288                            (point)))))
1289         (unless (member '%NoSelect flags)
1290           (push (utf7-decode (if (stringp group)
1291                                  group
1292                                (format "%s" group))
1293                              t)
1294                 groups))))
1295     (nreverse groups)))
1296
1297 (defun nnimap-get-responses (sequences)
1298   (let (responses)
1299     (dolist (sequence sequences)
1300       (goto-char (point-min))
1301       (when (re-search-forward (format "^%d " sequence) nil t)
1302         (push (list sequence (nnimap-parse-response))
1303               responses)))
1304     responses))
1305
1306 (deffoo nnimap-request-list (&optional server)
1307   (when (nnimap-change-group nil server)
1308     (with-current-buffer nntp-server-buffer
1309       (erase-buffer)
1310       (let ((groups
1311              (with-current-buffer (nnimap-buffer)
1312                (nnimap-get-groups)))
1313             sequences responses)
1314         (when groups
1315           (with-current-buffer (nnimap-buffer)
1316             (setf (nnimap-group nnimap-object) nil)
1317             (dolist (group groups)
1318               (setf (nnimap-examined nnimap-object) group)
1319               (push (list (nnimap-send-command "EXAMINE %S"
1320                                                (utf7-encode group t))
1321                           group)
1322                     sequences))
1323             (nnimap-wait-for-response (caar sequences))
1324             (setq responses
1325                   (nnimap-get-responses (mapcar #'car sequences))))
1326           (dolist (response responses)
1327             (let* ((sequence (car response))
1328                    (response (cadr response))
1329                    (group (cadr (assoc sequence sequences)))
1330                    (egroup (nnimap-encode-gnus-group group)))
1331               (when (and group
1332                          (equal (caar response) "OK"))
1333                 (let ((uidnext (nnimap-find-parameter "UIDNEXT" response))
1334                       highest exists)
1335                   (dolist (elem response)
1336                     (when (equal (cadr elem) "EXISTS")
1337                       (setq exists (string-to-number (car elem)))))
1338                   (when uidnext
1339                     (setq highest (1- (string-to-number (car uidnext)))))
1340                   (cond
1341                    ((null highest)
1342                     (insert (format "%S 0 1 y\n" egroup)))
1343                    ((zerop exists)
1344                     ;; Empty group.
1345                     (insert (format "%S %d %d y\n" egroup
1346                                     highest (1+ highest))))
1347                    (t
1348                     ;; Return the widest possible range.
1349                     (insert (format "%S %d 1 y\n" egroup
1350                                     (or highest exists)))))))))
1351           t)))))
1352
1353 (deffoo nnimap-request-newgroups (_date &optional server)
1354   (when (nnimap-change-group nil server)
1355     (with-current-buffer nntp-server-buffer
1356       (erase-buffer)
1357       (dolist (group (with-current-buffer (nnimap-buffer)
1358                        (nnimap-get-groups)))
1359         (unless (assoc group nnimap-current-infos)
1360           ;; Insert dummy numbers here -- they don't matter.
1361           (insert (format "%S 0 1 y\n" (nnimap-encode-gnus-group group)))))
1362       t)))
1363
1364 (deffoo nnimap-retrieve-group-data-early (server infos)
1365   (when (and (nnimap-change-group nil server)
1366              infos)
1367     (with-current-buffer (nnimap-buffer)
1368       (erase-buffer)
1369       (setf (nnimap-group nnimap-object) nil)
1370       (setf (nnimap-initial-resync nnimap-object) 0)
1371       (let ((qresyncp (nnimap-capability "QRESYNC"))
1372             params sequences active uidvalidity modseq group
1373             unexist)
1374         ;; Go through the infos and gather the data needed to know
1375         ;; what and how to request the data.
1376         (dolist (info infos)
1377           (setq params (gnus-info-params info)
1378                 group (nnimap-decode-gnus-group
1379                        (gnus-group-real-name (gnus-info-group info)))
1380                 active (cdr (assq 'active params))
1381                 unexist (assq 'unexist (gnus-info-marks info))
1382                 uidvalidity (cdr (assq 'uidvalidity params))
1383                 modseq (cdr (assq 'modseq params)))
1384           (setf (nnimap-examined nnimap-object) group)
1385           (if (and qresyncp
1386                    uidvalidity
1387                    active
1388                    modseq
1389                    unexist)
1390               (push
1391                (list (nnimap-send-command "EXAMINE %S (%s (%s %s))"
1392                                           (utf7-encode group t)
1393                                           (nnimap-quirk "QRESYNC")
1394                                           uidvalidity modseq)
1395                      'qresync
1396                      nil group 'qresync)
1397                sequences)
1398             (let ((command
1399                    (if uidvalidity
1400                        "EXAMINE"
1401                      ;; If we don't have a UIDVALIDITY, then this is
1402                      ;; the first time we've seen the group, so we
1403                      ;; have to do a SELECT (which is slower than an
1404                      ;; examine), but will tell us whether the group
1405                      ;; is read-only or not.
1406                      "SELECT"))
1407                   start)
1408               (if (and active uidvalidity unexist)
1409                   ;; Fetch the last 100 flags.
1410                   (setq start (max 1 (- (cdr active) 100)))
1411                 (incf (nnimap-initial-resync nnimap-object))
1412                 (setq start 1))
1413               (push (list (nnimap-send-command "%s %S" command
1414                                                (utf7-encode group t))
1415                           (nnimap-send-command "UID FETCH %d:* FLAGS" start)
1416                           start group command)
1417                     sequences))))
1418         sequences))))
1419
1420 (defun nnimap-quirk (command)
1421   (let ((quirk (assoc command nnimap-quirks)))
1422     ;; If this server is of a type that matches a quirk, then return
1423     ;; the "quirked" command instead of the proper one.
1424     (if (or (null quirk)
1425             (not (string-match (nth 1 quirk) (nnimap-greeting nnimap-object))))
1426         command
1427       (nth 2 quirk))))
1428
1429 (deffoo nnimap-finish-retrieve-group-infos (server infos sequences
1430                                                    &optional dont-insert)
1431   (when (and sequences
1432              (nnimap-change-group nil server t)
1433              ;; Check that the process is still alive.
1434              (get-buffer-process (nnimap-buffer))
1435              (memq (process-status (get-buffer-process (nnimap-buffer)))
1436                    '(open run)))
1437     (with-current-buffer (nnimap-buffer)
1438       ;; Wait for the final data to trickle in.
1439       (when (nnimap-wait-for-response (if (eq (cadar sequences) 'qresync)
1440                                           (caar sequences)
1441                                         (cadar sequences))
1442                                       t)
1443         ;; Now we should have most of the data we need, no matter
1444         ;; whether we're QRESYNCING, fetching all the flags from
1445         ;; scratch, or just fetching the last 100 flags per group.
1446         (nnimap-update-infos (nnimap-flags-to-marks
1447                               (nnimap-parse-flags
1448                                (nreverse sequences)))
1449                              infos)
1450         (unless dont-insert
1451           ;; Finally, just return something resembling an active file in
1452           ;; the nntp buffer, so that the agent can save the info, too.
1453           (with-current-buffer nntp-server-buffer
1454             (erase-buffer)
1455             (dolist (info infos)
1456               (let* ((group (gnus-info-group info))
1457                      (active (gnus-active group)))
1458                 (when active
1459                   (insert (format "%S %d %d y\n"
1460                                   (nnimap-encode-gnus-group
1461                                    (nnimap-decode-gnus-group
1462                                     (gnus-group-real-name group)))
1463                                   (cdr active)
1464                                   (car active))))))))))))
1465
1466 (defun nnimap-update-infos (flags infos)
1467   (dolist (info infos)
1468     (let* ((group (nnimap-decode-gnus-group
1469                    (gnus-group-real-name (gnus-info-group info))))
1470            (marks (cdr (assoc group flags))))
1471       (when marks
1472         (nnimap-update-info info marks)))))
1473
1474 (defun nnimap-update-info (info marks)
1475   (destructuring-bind (existing flags high low uidnext start-article
1476                                 permanent-flags uidvalidity
1477                                 vanished highestmodseq) marks
1478     (cond
1479      ;; Ignore groups with no UIDNEXT/marks.  This happens for
1480      ;; completely empty groups.
1481      ((and (not existing)
1482            (not uidnext))
1483       (let ((active (cdr (assq 'active (gnus-info-params info)))))
1484         (when active
1485           (gnus-set-active (gnus-info-group info) active))))
1486      ;; We have a mismatch between the old and new UIDVALIDITY
1487      ;; identifiers, so we have to re-request the group info (the next
1488      ;; time).  This virtually never happens.
1489      ((let ((old-uidvalidity
1490              (cdr (assq 'uidvalidity (gnus-info-params info)))))
1491         (and old-uidvalidity
1492              (not (equal old-uidvalidity uidvalidity))
1493              (or (not start-article)
1494                  (> start-article 1))))
1495       (gnus-group-remove-parameter info 'uidvalidity)
1496       (gnus-group-remove-parameter info 'modseq))
1497      ;; We have the data needed to update.
1498      (t
1499       (let* ((group (gnus-info-group info))
1500              (completep (and start-article
1501                              (= start-article 1)))
1502              (active (or (gnus-active group)
1503                          (cdr (assq 'active (gnus-info-params info))))))
1504         (when uidnext
1505           (setq high (1- uidnext)))
1506         ;; First set the active ranges based on high/low.
1507         (if (or completep
1508                 (not (gnus-active group)))
1509             (gnus-set-active group
1510                              (cond
1511                               (active
1512                                (cons (min (or low (car active))
1513                                           (car active))
1514                                      (max (or high (cdr active))
1515                                           (cdr active))))
1516                               ((and low high)
1517                                (cons low high))
1518                               (uidnext
1519                                ;; No articles in this group.
1520                                (cons uidnext (1- uidnext)))
1521                               (start-article
1522                                (cons start-article (1- start-article)))
1523                               (t
1524                                ;; No articles and no uidnext.
1525                                nil)))
1526           (gnus-set-active group
1527                            (cons (car active)
1528                                  (or high (1- uidnext)))))
1529         ;; See whether this is a read-only group.
1530         (unless (eq permanent-flags 'not-scanned)
1531           (gnus-group-set-parameter
1532            info 'permanent-flags
1533            (and (or (memq '%* permanent-flags)
1534                     (memq '%Seen permanent-flags))
1535                 permanent-flags)))
1536         ;; Update marks and read articles if this isn't a
1537         ;; read-only IMAP group.
1538         (when (setq permanent-flags
1539                     (cdr (assq 'permanent-flags (gnus-info-params info))))
1540           (if (and highestmodseq
1541                    (not start-article))
1542               ;; We've gotten the data by QRESYNCing.
1543               (nnimap-update-qresync-info
1544                info existing (nnimap-imap-ranges-to-gnus-ranges vanished) flags)
1545             ;; Do normal non-QRESYNC flag updates.
1546             ;; Update the list of read articles.
1547             (let* ((unread
1548                     (gnus-compress-sequence
1549                      (gnus-set-difference
1550                       (gnus-set-difference
1551                        existing
1552                        (gnus-sorted-union
1553                         (cdr (assoc '%Seen flags))
1554                         (cdr (assoc '%Deleted flags))))
1555                       (cdr (assoc '%Flagged flags)))))
1556                    (read (gnus-range-difference
1557                           (cons start-article high) unread)))
1558               (when (> start-article 1)
1559                 (setq read
1560                       (gnus-range-nconcat
1561                        (if (> start-article 1)
1562                            (gnus-sorted-range-intersection
1563                             (cons 1 (1- start-article))
1564                             (gnus-info-read info))
1565                          (gnus-info-read info))
1566                        read)))
1567               (when (or (not (listp permanent-flags))
1568                         (memq '%Seen permanent-flags))
1569                 (gnus-info-set-read info read))
1570               ;; Update the marks.
1571               (setq marks (gnus-info-marks info))
1572               (dolist (type (cdr nnimap-mark-alist))
1573                 (when (or (not (listp permanent-flags))
1574                           (memq (car (assoc (caddr type) flags))
1575                                 permanent-flags)
1576                           (memq '%* permanent-flags))
1577                   (let ((old-marks (assoc (car type) marks))
1578                         (new-marks
1579                          (gnus-compress-sequence
1580                           (cdr (or (assoc (caddr type) flags) ; %Flagged
1581                                    (assoc (intern (cadr type) obarray) flags)
1582                                    (assoc (cadr type) flags)))))) ; "\Flagged"
1583                     (setq marks (delq old-marks marks))
1584                     (pop old-marks)
1585                     (when (and old-marks
1586                                (> start-article 1))
1587                       (setq old-marks (gnus-range-difference
1588                                        old-marks
1589                                        (cons start-article high)))
1590                       (setq new-marks (gnus-range-nconcat old-marks new-marks)))
1591                     (when new-marks
1592                       (push (cons (car type) new-marks) marks)))))
1593               ;; Keep track of non-existing articles.
1594               (let* ((old-unexists (assq 'unexist marks))
1595                      (active (gnus-active group))
1596                      (unexists
1597                       (if completep
1598                           (gnus-range-difference
1599                            active
1600                            (gnus-compress-sequence existing))
1601                         (gnus-add-to-range
1602                          (cdr old-unexists)
1603                          (gnus-list-range-difference
1604                           existing (gnus-active group))))))
1605                 (when (> (car active) 1)
1606                   (setq unexists (gnus-range-add
1607                                   (cons 1 (1- (car active)))
1608                                   unexists)))
1609                 (if old-unexists
1610                     (setcdr old-unexists unexists)
1611                   (push (cons 'unexist unexists) marks)))
1612               (gnus-info-set-marks info marks t))))
1613         ;; Tell Gnus whether there are any \Recent messages in any of
1614         ;; the groups.
1615         (let ((recent (cdr (assoc '%Recent flags))))
1616           (when (and active
1617                      recent
1618                      (> (car (last recent)) (cdr active)))
1619             (push (list (cons (gnus-group-real-name group) 0))
1620                   nnmail-split-history)))
1621         ;; Note the active level for the next run-through.
1622         (gnus-group-set-parameter info 'active (gnus-active group))
1623         (gnus-group-set-parameter info 'uidvalidity uidvalidity)
1624         (gnus-group-set-parameter info 'modseq highestmodseq)
1625         (nnimap-store-info info (gnus-active group)))))))
1626
1627 (defun nnimap-update-qresync-info (info existing vanished flags)
1628   ;; Add all the vanished articles to the list of read articles.
1629   (gnus-info-set-read
1630    info
1631    (gnus-add-to-range
1632     (gnus-add-to-range
1633      (gnus-range-add (gnus-info-read info)
1634                      vanished)
1635      (cdr (assq '%Flagged flags)))
1636     (cdr (assq '%Seen flags))))
1637   (let ((marks (gnus-info-marks info)))
1638     (dolist (type (cdr nnimap-mark-alist))
1639       (let ((ticks (assoc (car type) marks))
1640             (new-marks
1641              (cdr (or (assoc (caddr type) flags) ; %Flagged
1642                       (assoc (intern (cadr type) obarray) flags)
1643                       (assoc (cadr type) flags))))) ; "\Flagged"
1644         (setq marks (delq ticks marks))
1645         (pop ticks)
1646         ;; Add the new marks we got.
1647         (setq ticks (gnus-add-to-range ticks new-marks))
1648         ;; Remove the marks from messages that don't have them.
1649         (setq ticks (gnus-remove-from-range
1650                      ticks
1651                      (gnus-compress-sequence
1652                       (gnus-sorted-complement existing new-marks))))
1653         (when ticks
1654           (push (cons (car type) ticks) marks)))
1655       (gnus-info-set-marks info marks t))
1656     ;; Add vanished to the list of unexisting articles.
1657     (when vanished
1658       (let* ((old-unexists (assq 'unexist marks))
1659              (unexists (gnus-range-add (cdr old-unexists) vanished)))
1660         (if old-unexists
1661             (setcdr old-unexists unexists)
1662           (push (cons 'unexist unexists) marks)))
1663       (gnus-info-set-marks info marks t))))
1664
1665 (defun nnimap-imap-ranges-to-gnus-ranges (irange)
1666   (if (zerop (length irange))
1667       nil
1668     (let ((result nil))
1669       (dolist (elem (split-string irange ","))
1670         (push
1671          (if (string-match ":" elem)
1672              (let ((numbers (split-string elem ":")))
1673                (cons (string-to-number (car numbers))
1674                      (string-to-number (cadr numbers))))
1675            (string-to-number elem))
1676          result))
1677       (nreverse result))))
1678
1679 (defun nnimap-store-info (info active)
1680   (let* ((group (nnimap-decode-gnus-group
1681                  (gnus-group-real-name (gnus-info-group info))))
1682          (entry (assoc group nnimap-current-infos)))
1683     (if entry
1684         (setcdr entry (list info active))
1685       (push (list group info active) nnimap-current-infos))))
1686
1687 (defun nnimap-flags-to-marks (groups)
1688   (let (data group uidnext articles start-article mark permanent-flags
1689              uidvalidity vanished highestmodseq)
1690     (dolist (elem groups)
1691       (setq group (car elem)
1692             uidnext (nth 1 elem)
1693             start-article (nth 2 elem)
1694             permanent-flags (nth 3 elem)
1695             uidvalidity (nth 4 elem)
1696             vanished (nth 5 elem)
1697             highestmodseq (nth 6 elem)
1698             articles (nthcdr 7 elem))
1699       (let ((high (caar articles))
1700             marks low existing)
1701         (dolist (article articles)
1702           (setq low (car article))
1703           (push (car article) existing)
1704           (dolist (flag (cdr article))
1705             (setq mark (assoc flag marks))
1706             (if (not mark)
1707                 (push (list flag (car article)) marks)
1708               (setcdr mark (cons (car article) (cdr mark))))))
1709         (push (list group existing marks high low uidnext start-article
1710                     permanent-flags uidvalidity vanished highestmodseq)
1711               data)))
1712     data))
1713
1714 (defun nnimap-parse-flags (sequences)
1715   (goto-char (point-min))
1716   ;; Change \Delete etc to %Delete, so that the Emacs Lisp reader can
1717   ;; read it.
1718   (subst-char-in-region (point-min) (point-max)
1719                         ?\\ ?% t)
1720   ;; Remove any MODSEQ entries in the buffer, because they may contain
1721   ;; numbers that are too large for 32-bit Emacsen.
1722   (while (re-search-forward " MODSEQ ([0-9]+)" nil t)
1723     (replace-match "" t t))
1724   (goto-char (point-min))
1725   (let (start end articles groups uidnext elems permanent-flags
1726               uidvalidity vanished highestmodseq)
1727     (dolist (elem sequences)
1728       (destructuring-bind (group-sequence flag-sequence totalp group command)
1729           elem
1730         (setq start (point))
1731         (when (and
1732                ;; The EXAMINE was successful.
1733                (search-forward (format "\n%d OK " group-sequence) nil t)
1734                (progn
1735                  (forward-line 1)
1736                  (setq end (point))
1737                  (goto-char start)
1738                  (setq permanent-flags
1739                        (if (equal command "SELECT")
1740                            (and (search-forward "PERMANENTFLAGS "
1741                                                 (or end (point-min)) t)
1742                                 (read (current-buffer)))
1743                          'not-scanned))
1744                  (goto-char start)
1745                  (setq uidnext
1746                        (and (search-forward "UIDNEXT "
1747                                             (or end (point-min)) t)
1748                             (read (current-buffer))))
1749                  (goto-char start)
1750                  (setq uidvalidity
1751                        (and (re-search-forward "UIDVALIDITY \\([0-9]+\\)"
1752                                                (or end (point-min)) t)
1753                             ;; Store UIDVALIDITY as a string, as it's
1754                             ;; too big for 32-bit Emacsen, usually.
1755                             (match-string 1)))
1756                  (goto-char start)
1757                  (setq vanished
1758                        (and (eq flag-sequence 'qresync)
1759                             (re-search-forward "^\\* VANISHED .*? \\([0-9:,]+\\)"
1760                                                (or end (point-min)) t)
1761                             (match-string 1)))
1762                  (goto-char start)
1763                  (setq highestmodseq
1764                        (and (re-search-forward "HIGHESTMODSEQ \\([0-9]+\\)"
1765                                             (or end (point-min)) t)
1766                             (match-string 1)))
1767                  (goto-char end)
1768                  (forward-line -1))
1769                ;; The UID FETCH FLAGS was successful.
1770                (or (eq flag-sequence 'qresync)
1771                    (search-forward (format "\n%d OK " flag-sequence) nil t)))
1772           (if (eq flag-sequence 'qresync)
1773               (progn
1774                 (goto-char start)
1775                 (setq start end))
1776             (setq start (point))
1777             (goto-char end))
1778           (while (re-search-forward "^\\* [0-9]+ FETCH " start t)
1779             (progn
1780               (setq elems (read (current-buffer)))
1781               (push (cons (cadr (memq 'UID elems))
1782                           (cadr (memq 'FLAGS elems)))
1783                     articles)))
1784           (push (nconc (list group uidnext totalp permanent-flags uidvalidity
1785                              vanished highestmodseq)
1786                        articles)
1787                 groups)
1788           (if (eq flag-sequence 'qresync)
1789               (goto-char end)
1790             (setq end (point)))
1791           (setq articles nil))))
1792     groups))
1793
1794 (defun nnimap-find-process-buffer (buffer)
1795   (cadr (assoc buffer nnimap-connection-alist)))
1796
1797 (deffoo nnimap-request-post (&optional _server)
1798   (setq nnimap-status-string "Read-only server")
1799   nil)
1800
1801 (defvar gnus-refer-thread-use-nnir) ;; gnus-sum.el
1802 (declare-function gnus-fetch-headers "gnus-sum"
1803                   (articles &optional limit force-new dependencies))
1804
1805 (autoload 'nnir-search-thread "nnir")
1806
1807 (deffoo nnimap-request-thread (header &optional group server)
1808   (when group
1809     (setq group (nnimap-decode-gnus-group group)))
1810   (if gnus-refer-thread-use-nnir
1811       (nnir-search-thread header)
1812     (when (nnimap-change-group group server)
1813       (let* ((cmd (nnimap-make-thread-query header))
1814              (result (with-current-buffer (nnimap-buffer)
1815                        (nnimap-command  "UID SEARCH %s" cmd))))
1816         (when result
1817           (gnus-fetch-headers
1818            (and (car result)
1819                 (delete 0 (mapcar #'string-to-number
1820                                   (cdr (assoc "SEARCH" (cdr result))))))
1821            nil t))))))
1822
1823 (defun nnimap-change-group (group &optional server no-reconnect read-only)
1824   "Change group to GROUP if non-nil.
1825 If SERVER is set, check that server is connected, otherwise retry
1826 to reconnect, unless NO-RECONNECT is set to t.  Return nil if
1827 unsuccessful in connecting.
1828 If GROUP is nil, return t.
1829 If READ-ONLY is set, send EXAMINE rather than SELECT to the server.
1830 Return the server's response to the SELECT or EXAMINE command."
1831   (let ((open-result t))
1832     (when (and server
1833                (not (nnimap-server-opened server)))
1834       (setq open-result (nnimap-open-server server nil no-reconnect)))
1835     (cond
1836      ((not open-result)
1837       nil)
1838      ((not group)
1839       t)
1840      (t
1841       (with-current-buffer (nnimap-buffer)
1842         (let ((result (nnimap-command "%s %S"
1843                                       (if read-only
1844                                           "EXAMINE"
1845                                         "SELECT")
1846                                       (utf7-encode group t))))
1847           (when (car result)
1848             (setf (nnimap-group nnimap-object) group
1849                   (nnimap-select-result nnimap-object) result)
1850             result)))))))
1851
1852 (defun nnimap-find-connection (buffer)
1853   "Find the connection delivering to BUFFER."
1854   (let ((entry (assoc buffer nnimap-connection-alist)))
1855     (when entry
1856       (if (and (buffer-name (cadr entry))
1857                (get-buffer-process (cadr entry))
1858                (memq (process-status (get-buffer-process (cadr entry)))
1859                      '(open run)))
1860           (get-buffer-process (cadr entry))
1861         (setq nnimap-connection-alist (delq entry nnimap-connection-alist))
1862         nil))))
1863
1864 (defvar nnimap-sequence 0)
1865
1866 (defun nnimap-send-command (&rest args)
1867   (setf (nnimap-last-command-time nnimap-object) (current-time))
1868   (process-send-string
1869    (get-buffer-process (current-buffer))
1870    (nnimap-log-command
1871     (format "%d %s%s\n"
1872             (incf nnimap-sequence)
1873             (apply #'format args)
1874             (if (nnimap-newlinep nnimap-object)
1875                 ""
1876               "\r"))))
1877   ;; Some servers apparently can't have many outstanding
1878   ;; commands, so throttle them.
1879   (unless nnimap-streaming
1880     (nnimap-wait-for-response nnimap-sequence))
1881   nnimap-sequence)
1882
1883 (defvar nnimap-record-commands nil
1884   "If non-nil, log commands to the \"*imap log*\" buffer.")
1885
1886 (defun nnimap-log-buffer ()
1887   (let ((name "*imap log*"))
1888     (or (get-buffer name)
1889         (with-current-buffer (get-buffer-create name)
1890           (setq-local window-point-insertion-type t)
1891           (current-buffer)))))
1892
1893 (defun nnimap-log-command (command)
1894   (when nnimap-record-commands
1895     (with-current-buffer (nnimap-log-buffer)
1896       (goto-char (point-max))
1897       (insert (format-time-string "%H:%M:%S")
1898               " [" nnimap-address "] "
1899               (if nnimap-inhibit-logging
1900                   "(inhibited)\n"
1901                 command))))
1902   command)
1903
1904 (defun nnimap-command (&rest args)
1905   (erase-buffer)
1906   (let* ((sequence (apply #'nnimap-send-command args))
1907          (response (nnimap-get-response sequence)))
1908     (if (equal (caar response) "OK")
1909         (cons t response)
1910       (nnheader-report 'nnimap "%s"
1911                        (mapconcat (lambda (a)
1912                                     (format "%s" a))
1913                                   (car response) " "))
1914       nil)))
1915
1916 (defun nnimap-get-response (sequence)
1917   (nnimap-wait-for-response sequence)
1918   (nnimap-parse-response))
1919
1920 (defun nnimap-wait-for-connection (&optional regexp)
1921   (nnimap-wait-for-line (or regexp "^[*.] .*\n") "[*.] \\([A-Z0-9]+\\)"))
1922
1923 (defun nnimap-wait-for-line (regexp &optional response-regexp)
1924   (let ((process (get-buffer-process (current-buffer))))
1925     (goto-char (point-min))
1926     (while (and (memq (process-status process)
1927                       '(open run))
1928                 (not (re-search-forward regexp nil t)))
1929       (nnheader-accept-process-output process)
1930       (goto-char (point-min)))
1931     (forward-line -1)
1932     (and (looking-at (or response-regexp regexp))
1933          (match-string 1))))
1934
1935 (defun nnimap-wait-for-response (sequence &optional messagep)
1936   (let ((process (get-buffer-process (current-buffer)))
1937         openp)
1938     (condition-case nil
1939         (progn
1940           (goto-char (point-max))
1941           (while (and (setq openp (memq (process-status process)
1942                                         '(open run)))
1943                       (progn
1944                         ;; Skip past any "*" lines that the server has
1945                         ;; output.
1946                         (while (and (not (bobp))
1947                                     (progn
1948                                       (forward-line -1)
1949                                       (looking-at "\\*\\|[0-9]+ OK NOOP"))))
1950                         (not (looking-at (format "%d .*\n" sequence)))))
1951             (when messagep
1952               (nnheader-message-maybe
1953                7 "nnimap read %dk from %s%s" (/ (buffer-size) 1000)
1954                nnimap-address
1955                (if (not (zerop (nnimap-initial-resync nnimap-object)))
1956                    (format " (initial sync of %d group%s; please wait)"
1957                            (nnimap-initial-resync nnimap-object)
1958                            (if (= (nnimap-initial-resync nnimap-object) 1)
1959                                ""
1960                              "s"))
1961                  "")))
1962             (nnheader-accept-process-output process)
1963             (goto-char (point-max)))
1964           (setf (nnimap-initial-resync nnimap-object) 0)
1965           openp)
1966       (quit
1967        (when debug-on-quit
1968          (debug "Quit"))
1969        ;; The user hit C-g while we were waiting: kill the process, in case
1970        ;; it's a gnutls-cli process that's stuck (tends to happen a lot behind
1971        ;; NAT routers).
1972        (delete-process process)
1973        nil))))
1974
1975 (defun nnimap-parse-response ()
1976   (let ((lines (split-string (nnimap-last-response-string) "\r\n" t))
1977         result)
1978     (dolist (line lines)
1979       (push (cdr (nnimap-parse-line line)) result))
1980     ;; Return the OK/error code first, and then all the "continuation
1981     ;; lines" afterwards.
1982     (cons (pop result)
1983           (nreverse result))))
1984
1985 ;; Parse an IMAP response line lightly.  They look like
1986 ;; "* OK [UIDVALIDITY 1164213559] UIDs valid", typically, so parse
1987 ;; the lines into a list of strings and lists of string.
1988 (defun nnimap-parse-line (line)
1989   (let (char result)
1990     (with-temp-buffer
1991       (mm-disable-multibyte)
1992       (insert line)
1993       (goto-char (point-min))
1994       (while (not (eobp))
1995         (if (eql (setq char (following-char)) ? )
1996             (forward-char 1)
1997           (push
1998            (cond
1999             ((eql char ?\[)
2000              (split-string
2001               (buffer-substring
2002                (1+ (point))
2003                (if (search-forward "]" (line-end-position) 'move)
2004                    (1- (point))
2005                  (point)))))
2006             ((eql char ?\()
2007              (split-string
2008               (buffer-substring
2009                (1+ (point))
2010                (if (search-forward ")" (line-end-position) 'move)
2011                    (1- (point))
2012                  (point)))))
2013             ((eql char ?\")
2014              (forward-char 1)
2015              (buffer-substring
2016               (point)
2017               (1- (or (search-forward "\"" (line-end-position) 'move)
2018                       (point)))))
2019             (t
2020              (buffer-substring (point) (if (search-forward " " nil t)
2021                                            (1- (point))
2022                                          (goto-char (point-max))))))
2023            result)))
2024       (nreverse result))))
2025
2026 (defun nnimap-last-response-string ()
2027   (save-excursion
2028     (forward-line 1)
2029     (let ((end (point)))
2030       (forward-line -1)
2031       (when (not (bobp))
2032         (forward-line -1)
2033         (while (and (not (bobp))
2034                     (eql (following-char) ?*))
2035           (forward-line -1))
2036         (unless (eql (following-char) ?*)
2037           (forward-line 1)))
2038       (buffer-substring (point) end))))
2039
2040 (defvar nnimap-incoming-split-list nil)
2041
2042 (defun nnimap-fetch-inbox (articles)
2043   (erase-buffer)
2044   (nnimap-wait-for-response
2045    (nnimap-send-command
2046     "UID FETCH %s %s"
2047     (nnimap-article-ranges articles)
2048     (format "(UID %s%s)"
2049             (format
2050              (if (nnimap-ver4-p)
2051                  "BODY.PEEK"
2052                "RFC822.PEEK"))
2053             (cond
2054              (nnimap-split-download-body-default
2055               "[]")
2056              ((nnimap-ver4-p)
2057               "[HEADER]")
2058              (t
2059               "[1]"))))
2060    t))
2061
2062 (defun nnimap-split-incoming-mail ()
2063   (with-current-buffer (nnimap-buffer)
2064     (let ((nnimap-incoming-split-list nil)
2065           (nnmail-split-methods
2066            (cond
2067             ((eq nnimap-split-methods 'default)
2068              nnmail-split-methods)
2069             (nnimap-split-methods
2070              nnimap-split-methods)
2071             (nnimap-split-fancy
2072              'nnmail-split-fancy)))
2073           (nnmail-split-fancy (or nnimap-split-fancy
2074                                   nnmail-split-fancy))
2075           (nnmail-inhibit-default-split-group t)
2076           (groups (nnimap-get-groups))
2077           (can-move (and (nnimap-capability "MOVE")
2078                          (equal (nnimap-quirk "MOVE") "MOVE")))
2079           new-articles)
2080       (erase-buffer)
2081       (nnimap-command "SELECT %S" nnimap-inbox)
2082       (setf (nnimap-group nnimap-object) nnimap-inbox)
2083       (setq new-articles (nnimap-new-articles (nnimap-get-flags "1:*")))
2084       (when new-articles
2085         (nnimap-fetch-inbox new-articles)
2086         (nnimap-transform-split-mail)
2087         (nnheader-ms-strip-cr)
2088         (nnmail-cache-open)
2089         (nnmail-split-incoming (current-buffer)
2090                                #'nnimap-save-mail-spec
2091                                nil nil
2092                                #'nnimap-dummy-active-number
2093                                #'nnimap-save-mail-spec)
2094         (when nnimap-incoming-split-list
2095           (let ((specs (nnimap-make-split-specs nnimap-incoming-split-list))
2096                 sequences junk-articles)
2097             ;; Create any groups that doesn't already exist on the
2098             ;; server first.
2099             (dolist (spec specs)
2100               (when (and (not (member (car spec) groups))
2101                          (not (eq (car spec) 'junk)))
2102                 (nnimap-command "CREATE %S" (utf7-encode (car spec) t))))
2103             ;; Then copy over all the messages.
2104             (erase-buffer)
2105             (dolist (spec specs)
2106               (let ((group (car spec))
2107                     (ranges (cdr spec)))
2108                 (if (eq group 'junk)
2109                     (setq junk-articles ranges)
2110                   ;; Don't copy if the message is already in its
2111                   ;; target group.
2112                   (unless (string= group nnimap-inbox)
2113                     (push (list (nnimap-send-command
2114                                  (if can-move
2115                                      "UID MOVE %s %S"
2116                                    "UID COPY %s %S")
2117                                  (nnimap-article-ranges ranges)
2118                                  (utf7-encode group t))
2119                                 ranges)
2120                           sequences)))))
2121             ;; Wait for the last COPY response...
2122             (when (and (not can-move) sequences)
2123               (nnimap-wait-for-response (caar sequences))
2124               ;; And then mark the successful copy actions as deleted,
2125               ;; and possibly expunge them.
2126               (nnimap-mark-and-expunge-incoming
2127                (nnimap-parse-copied-articles sequences)))
2128             (nnimap-mark-and-expunge-incoming junk-articles)))))))
2129
2130 (defun nnimap-mark-and-expunge-incoming (range)
2131   (when range
2132     (setq range (nnimap-article-ranges range))
2133     (erase-buffer)
2134     (let ((sequence
2135            (nnimap-send-command
2136             "UID STORE %s +FLAGS.SILENT (\\Deleted)" range)))
2137       (cond
2138        ;; If the server supports it, we now delete the message we have
2139        ;; just copied over.
2140        ((nnimap-capability "UIDPLUS")
2141         (setq sequence (nnimap-send-command "UID EXPUNGE %s" range)))
2142        ;; If it doesn't support UID EXPUNGE, then we only expunge if the
2143        ;; user has configured it.
2144        (nnimap-expunge
2145         (setq sequence (nnimap-send-command "EXPUNGE"))))
2146       (nnimap-wait-for-response sequence))))
2147
2148 (defun nnimap-parse-copied-articles (sequences)
2149   (let (sequence copied range)
2150     (goto-char (point-min))
2151     (while (re-search-forward "^\\([0-9]+\\) OK\\b" nil t)
2152       (setq sequence (string-to-number (match-string 1)))
2153       (when (setq range (cadr (assq sequence sequences)))
2154         (push (gnus-uncompress-range range) copied)))
2155     (gnus-compress-sequence (sort (apply #'nconc copied) #'<))))
2156
2157 (defun nnimap-new-articles (flags)
2158   (let (new)
2159     (dolist (elem flags)
2160       (unless (gnus-list-memq-of-list nnimap-unsplittable-articles
2161                                       (cdr elem))
2162         (push (car elem) new)))
2163     (gnus-compress-sequence (nreverse new))))
2164
2165 (defun nnimap-make-split-specs (list)
2166   (let ((specs nil)
2167         entry)
2168     (dolist (elem list)
2169       (destructuring-bind (article spec) elem
2170         (dolist (group (delete nil (mapcar #'car spec)))
2171           (unless (setq entry (assoc group specs))
2172             (push (setq entry (list group)) specs))
2173           (setcdr entry (cons article (cdr entry))))))
2174     (dolist (entry specs)
2175       (setcdr entry (gnus-compress-sequence (sort (cdr entry) #'<))))
2176     specs))
2177
2178 (defun nnimap-transform-split-mail ()
2179   (goto-char (point-min))
2180   (let (article bytes)
2181     (block nil
2182       (while (not (eobp))
2183         (while (not (looking-at "\\* [0-9]+ FETCH.+UID \\([0-9]+\\)"))
2184           (delete-region (point) (progn (forward-line 1) (point)))
2185           (when (eobp)
2186             (return)))
2187         (setq article (match-string 1)
2188               bytes (nnimap-get-length))
2189         (delete-region (line-beginning-position) (line-end-position))
2190         ;; Insert MMDF separator, and a way to remember what this
2191         ;; article UID is.
2192         (insert (format "\^A\^A\^A\^A\n\nX-nnimap-article: %s" article))
2193         (forward-char (1+ bytes))
2194         (setq bytes (nnimap-get-length))
2195         (delete-region (line-beginning-position) (line-end-position))
2196         ;; There's a body; skip past that.
2197         (when bytes
2198           (forward-char (1+ bytes))
2199           (delete-region (line-beginning-position) (line-end-position)))))))
2200
2201 (defun nnimap-dummy-active-number (_group &optional _server)
2202   1)
2203
2204 (defun nnimap-save-mail-spec (group-art &optional _server _full-nov)
2205   (let (article)
2206     (goto-char (point-min))
2207     (if (not (re-search-forward "X-nnimap-article: \\([0-9]+\\)" nil t))
2208         (error "Invalid nnimap mail")
2209       (setq article (string-to-number (match-string 1))))
2210     (push (list article
2211                 (if (eq group-art 'junk)
2212                     (list (cons 'junk 1))
2213                   group-art))
2214           nnimap-incoming-split-list)))
2215
2216 (defun nnimap-make-thread-query (header)
2217   (let* ((id  (mail-header-id header))
2218          (refs (split-string
2219                 (or (mail-header-references header)
2220                     "")))
2221          (value
2222           (format
2223            "(OR HEADER REFERENCES %S HEADER Message-Id %S)"
2224            id id)))
2225     (dolist (refid refs value)
2226       (setq value (format
2227                    "(OR (OR HEADER Message-Id %S HEADER REFERENCES %S) %s)"
2228                    refid refid value)))))
2229
2230
2231 (provide 'nnimap)
2232
2233 ;;; nnimap.el ends here