code.delx.au - gnu-emacs/blob - lisp/gnus/nnimap.el

   1 ;;; nnimap.el --- IMAP interface for Gnus
   2
   3 ;; Copyright (C) 2010-2013 Free Software Foundation, Inc.
   4
   5 ;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
   6 ;;         Simon Josefsson <simon@josefsson.org>
   7
   8 ;; This file is part of GNU Emacs.
   9
  10 ;; GNU Emacs is free software: you can redistribute it and/or modify
  11 ;; it under the terms of the GNU General Public License as published by
  12 ;; the Free Software Foundation, either version 3 of the License, or
  13 ;; (at your option) any later version.
  14
  15 ;; GNU Emacs is distributed in the hope that it will be useful,
  16 ;; but WITHOUT ANY WARRANTY; without even the implied warranty of
  17 ;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
  18 ;; GNU General Public License for more details.
  19
  20 ;; You should have received a copy of the GNU General Public License
  21 ;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
  22
  23 ;;; Commentary:
  24
  25 ;; nnimap interfaces Gnus with IMAP servers.
  26
  27 ;;; Code:
  28
  29 ;; For Emacs <22.2 and XEmacs.
  30 (eval-and-compile
  31   (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
  32
  33 (eval-and-compile
  34   (require 'nnheader)
  35   ;; In Emacs 24, `open-protocol-stream' is an autoloaded alias for
  36   ;; `make-network-stream'.
  37   (unless (fboundp 'open-protocol-stream)
  38     (require 'proto-stream)))
  39
  40 (eval-when-compile
  41   (require 'cl))
  42
  43 (require 'nnheader)
  44 (require 'gnus-util)
  45 (require 'gnus)
  46 (require 'nnoo)
  47 (require 'netrc)
  48 (require 'utf7)
  49 (require 'tls)
  50 (require 'parse-time)
  51 (require 'nnmail)
  52
  53 (autoload 'auth-source-forget+ "auth-source")
  54 (autoload 'auth-source-search "auth-source")
  55
  56 (nnoo-declare nnimap)
  57
  58 (defvoo nnimap-address nil
  59   "The address of the IMAP server.")
  60
  61 (defvoo nnimap-user nil
  62   "Username to use for authentication to the IMAP server.")
  63
  64 (defvoo nnimap-server-port nil
  65   "The IMAP port used.
  66 If nnimap-stream is `ssl', this will default to `imaps'.  If not,
  67 it will default to `imap'.")
  68
  69 (defvoo nnimap-stream 'undecided
  70   "How nnimap talks to the IMAP server.
  71 The value should be either `undecided', `ssl' or `tls',
  72 `network', `starttls', `plain', or `shell'.
  73
  74 If the value is `undecided', nnimap tries `ssl' first, then falls
  75 back on `network'.")
  76
  77 (defvoo nnimap-shell-program (if (boundp 'imap-shell-program)
  78                                  (if (listp imap-shell-program)
  79                                      (car imap-shell-program)
  80                                    imap-shell-program)
  81                                "ssh %s imapd"))
  82
  83 (defvoo nnimap-inbox nil
  84   "The mail box where incoming mail arrives and should be split out of.
  85 For example, \"INBOX\".")
  86
  87 (defvoo nnimap-split-methods nil
  88   "How mail is split.
  89 Uses the same syntax as `nnmail-split-methods'.")
  90
  91 (defvoo nnimap-split-fancy nil
  92   "Uses the same syntax as `nnmail-split-fancy'.")
  93
  94 (defvoo nnimap-unsplittable-articles '(%Deleted %Seen)
  95   "Articles with the flags in the list will not be considered when splitting.")
  96
  97 (make-obsolete-variable 'nnimap-split-rule "see `nnimap-split-methods'"
  98                         "Emacs 24.1")
  99
 100 (defvoo nnimap-authenticator nil
 101   "How nnimap authenticate itself to the server.
 102 Possible choices are nil (use default methods), `anonymous',
 103 `login', `plain' and `cram-md5'.")
 104
 105 (defvoo nnimap-expunge t
 106   "If non-nil, expunge articles after deleting them.
 107 This is always done if the server supports UID EXPUNGE, but it's
 108 not done by default on servers that doesn't support that command.")
 109
 110 (defvoo nnimap-streaming t
 111   "If non-nil, try to use streaming commands with IMAP servers.
 112 Switching this off will make nnimap slower, but it helps with
 113 some servers.")
 114
 115 (defvoo nnimap-connection-alist nil)
 116
 117 (defvoo nnimap-current-infos nil)
 118
 119 (defvoo nnimap-fetch-partial-articles nil
 120   "If non-nil, Gnus will fetch partial articles.
 121 If t, Gnus will fetch only the first part.  If a string, it
 122 will fetch all parts that have types that match that string.  A
 123 likely value would be \"text/\" to automatically fetch all
 124 textual parts.")
 125
 126 (defvar nnimap-process nil)
 127
 128 (defvar nnimap-status-string "")
 129
 130 (defvar nnimap-split-download-body-default nil
 131   "Internal variable with default value for `nnimap-split-download-body'.")
 132
 133 (defvar nnimap-keepalive-timer nil)
 134 (defvar nnimap-process-buffers nil)
 135
 136 (defstruct nnimap
 137   group process commands capabilities select-result newlinep server
 138   last-command-time greeting examined stream-type initial-resync)
 139
 140 (defvar nnimap-object nil)
 141
 142 (defvar nnimap-mark-alist
 143   '((read "\\Seen" %Seen)
 144     (tick "\\Flagged" %Flagged)
 145     (reply "\\Answered" %Answered)
 146     (expire "gnus-expire")
 147     (dormant "gnus-dormant")
 148     (score "gnus-score")
 149     (save "gnus-save")
 150     (download "gnus-download")
 151     (forward "gnus-forward")))
 152
 153 (defvar nnimap-quirks
 154   '(("QRESYNC" "Zimbra" "QRESYNC ")))
 155
 156 (defvar nnimap-inhibit-logging nil)
 157
 158 (defun nnimap-buffer ()
 159   (nnimap-find-process-buffer nntp-server-buffer))
 160
 161 (defun nnimap-header-parameters ()
 162   (format "(UID RFC822.SIZE BODYSTRUCTURE %s)"
 163           (format
 164            (if (nnimap-ver4-p)
 165                "BODY.PEEK[HEADER.FIELDS %s]"
 166              "RFC822.HEADER.LINES %s")
 167            (append '(Subject From Date Message-Id
 168                              References In-Reply-To Xref)
 169                    nnmail-extra-headers))))
 170
 171 (deffoo nnimap-retrieve-headers (articles &optional group server fetch-old)
 172   (when group
 173     (setq group (nnimap-decode-gnus-group group)))
 174   (with-current-buffer nntp-server-buffer
 175     (erase-buffer)
 176     (when (nnimap-possibly-change-group group server)
 177       (with-current-buffer (nnimap-buffer)
 178         (erase-buffer)
 179         (nnimap-wait-for-response
 180          (nnimap-send-command
 181           "UID FETCH %s %s"
 182           (nnimap-article-ranges (gnus-compress-sequence articles))
 183           (nnimap-header-parameters))
 184          t)
 185         (nnimap-transform-headers)
 186         (nnheader-remove-cr-followed-by-lf))
 187       (insert-buffer-substring
 188        (nnimap-find-process-buffer (current-buffer))))
 189     'headers))
 190
 191 (defun nnimap-transform-headers ()
 192   (goto-char (point-min))
 193   (let (article lines size string)
 194     (block nil
 195       (while (not (eobp))
 196         (while (not (looking-at "\\* [0-9]+ FETCH"))
 197           (delete-region (point) (progn (forward-line 1) (point)))
 198           (when (eobp)
 199             (return)))
 200         (goto-char (match-end 0))
 201         ;; Unfold quoted {number} strings.
 202         (while (re-search-forward
 203                 "[^]][ (]{\\([0-9]+\\)}\r?\n"
 204                 (save-excursion
 205                   ;; Start of the header section.
 206                   (or (re-search-forward "] {[0-9]+}\r?\n" nil t)
 207                       ;; Start of the next FETCH.
 208                       (re-search-forward "\\* [0-9]+ FETCH" nil t)
 209                       (point-max)))
 210                 t)
 211           (setq size (string-to-number (match-string 1)))
 212           (delete-region (+ (match-beginning 0) 2) (point))
 213           (setq string (buffer-substring (point) (+ (point) size)))
 214           (delete-region (point) (+ (point) size))
 215           (insert (format "%S" (mm-subst-char-in-string ?\n ?\s string))))
 216         (beginning-of-line)
 217         (setq article
 218               (and (re-search-forward "UID \\([0-9]+\\)" (line-end-position)
 219                                       t)
 220                    (match-string 1)))
 221         (setq lines nil)
 222         (setq size
 223               (and (re-search-forward "RFC822.SIZE \\([0-9]+\\)"
 224                                       (line-end-position)
 225                                       t)
 226                    (match-string 1)))
 227         (beginning-of-line)
 228         (when (search-forward "BODYSTRUCTURE" (line-end-position) t)
 229           (let ((structure (ignore-errors
 230                              (read (current-buffer)))))
 231             (while (and (consp structure)
 232                         (not (atom (car structure))))
 233               (setq structure (car structure)))
 234             (setq lines (if (and
 235                              (stringp (car structure))
 236                              (equal (upcase (nth 0 structure)) "MESSAGE")
 237                              (equal (upcase (nth 1 structure)) "RFC822"))
 238                             (nth 9 structure)
 239                           (nth 7 structure)))))
 240         (delete-region (line-beginning-position) (line-end-position))
 241         (insert (format "211 %s Article retrieved." article))
 242         (forward-line 1)
 243         (when size
 244           (insert (format "Chars: %s\n" size)))
 245         (when lines
 246           (insert (format "Lines: %s\n" lines)))
 247         (unless (re-search-forward "^\r$" nil t)
 248           (goto-char (point-max)))
 249         (delete-region (line-beginning-position) (line-end-position))
 250         (insert ".")
 251         (forward-line 1)))))
 252
 253 (defun nnimap-unfold-quoted-lines ()
 254   ;; Unfold quoted {number} strings.
 255   (let (size string)
 256     (while (re-search-forward " {\\([0-9]+\\)}\r?\n" nil t)
 257       (setq size (string-to-number (match-string 1)))
 258       (delete-region (1+ (match-beginning 0)) (point))
 259       (setq string (buffer-substring (point) (+ (point) size)))
 260       (delete-region (point) (+ (point) size))
 261       (insert (format "%S" string)))))
 262
 263 (defun nnimap-get-length ()
 264   (and (re-search-forward "{\\([0-9]+\\)}" (line-end-position) t)
 265        (string-to-number (match-string 1))))
 266
 267 (defun nnimap-article-ranges (ranges)
 268   (let (result)
 269     (cond
 270      ((numberp ranges)
 271       (number-to-string ranges))
 272      ((numberp (cdr ranges))
 273       (format "%d:%d" (car ranges) (cdr ranges)))
 274      (t
 275       (dolist (elem ranges)
 276         (push
 277          (if (consp elem)
 278              (format "%d:%d" (car elem) (cdr elem))
 279            (number-to-string elem))
 280          result))
 281       (mapconcat #'identity (nreverse result) ",")))))
 282
 283 (deffoo nnimap-open-server (server &optional defs no-reconnect)
 284   (if (nnimap-server-opened server)
 285       t
 286     (unless (assq 'nnimap-address defs)
 287       (setq defs (append defs (list (list 'nnimap-address server)))))
 288     (nnoo-change-server 'nnimap server defs)
 289     (if no-reconnect
 290         (nnimap-find-connection nntp-server-buffer)
 291       (or (nnimap-find-connection nntp-server-buffer)
 292           (nnimap-open-connection nntp-server-buffer)))))
 293
 294 (defun nnimap-make-process-buffer (buffer)
 295   (with-current-buffer
 296       (generate-new-buffer (format " *nnimap %s %s %s*"
 297                                    nnimap-address nnimap-server-port
 298                                    (gnus-buffer-exists-p buffer)))
 299     (mm-disable-multibyte)
 300     (buffer-disable-undo)
 301     (gnus-add-buffer)
 302     (set (make-local-variable 'after-change-functions) nil)
 303     (set (make-local-variable 'nnimap-object)
 304          (make-nnimap :server (nnoo-current-server 'nnimap)
 305                       :initial-resync 0))
 306     (push (list buffer (current-buffer)) nnimap-connection-alist)
 307     (push (current-buffer) nnimap-process-buffers)
 308     (current-buffer)))
 309
 310 (defun nnimap-credentials (address ports user)
 311   (let* ((auth-source-creation-prompts
 312           '((user  . "IMAP user at %h: ")
 313             (secret . "IMAP password for %u@%h: ")))
 314          (found (nth 0 (auth-source-search :max 1
 315                                            :host address
 316                                            :port ports
 317                                            :user user
 318                                            :require '(:user :secret)
 319                                            :create t))))
 320     (if found
 321         (list (plist-get found :user)
 322               (let ((secret (plist-get found :secret)))
 323                 (if (functionp secret)
 324                     (funcall secret)
 325                   secret))
 326               (plist-get found :save-function))
 327       nil)))
 328
 329 (defun nnimap-keepalive ()
 330   (let ((now (current-time)))
 331     (dolist (buffer nnimap-process-buffers)
 332       (when (buffer-name buffer)
 333         (with-current-buffer buffer
 334           (when (and nnimap-object
 335                      (nnimap-last-command-time nnimap-object)
 336                      (> (gnus-float-time
 337                          (time-subtract
 338                           now
 339                           (nnimap-last-command-time nnimap-object)))
 340                         ;; More than five minutes since the last command.
 341                         (* 5 60)))
 342             (nnimap-send-command "NOOP")))))))
 343
 344 (defun nnimap-open-connection (buffer)
 345   ;; Be backwards-compatible -- the earlier value of nnimap-stream was
 346   ;; `ssl' when nnimap-server-port was nil.  Sort of.
 347   (when (and nnimap-server-port
 348              (eq nnimap-stream 'undecided))
 349     (setq nnimap-stream 'ssl))
 350   (let ((stream
 351          (if (eq nnimap-stream 'undecided)
 352              (loop for type in '(ssl network)
 353                    for stream = (let ((nnimap-stream type))
 354                                   (nnimap-open-connection-1 buffer))
 355                    while (eq stream 'no-connect)
 356                    finally (return stream))
 357            (nnimap-open-connection-1 buffer))))
 358     (if (eq stream 'no-connect)
 359         nil
 360       stream)))
 361
 362 (defun nnimap-map-port (port)
 363   (if (equal port "imaps")
 364       "993"
 365     port))
 366
 367 (defun nnimap-open-connection-1 (buffer)
 368   (unless nnimap-keepalive-timer
 369     (setq nnimap-keepalive-timer (run-at-time (* 60 15) (* 60 15)
 370                                               'nnimap-keepalive)))
 371   (with-current-buffer (nnimap-make-process-buffer buffer)
 372     (let* ((coding-system-for-read 'binary)
 373            (coding-system-for-write 'binary)
 374            (ports
 375             (cond
 376              ((memq nnimap-stream '(network plain starttls))
 377               (nnheader-message 7 "Opening connection to %s..."
 378                                 nnimap-address)
 379               '("imap" "143"))
 380              ((eq nnimap-stream 'shell)
 381               (nnheader-message 7 "Opening connection to %s via shell..."
 382                                 nnimap-address)
 383               '("imap"))
 384              ((memq nnimap-stream '(ssl tls))
 385               (nnheader-message 7 "Opening connection to %s via tls..."
 386                                 nnimap-address)
 387               '("imaps" "imap" "993" "143"))
 388              (t
 389               (error "Unknown stream type: %s" nnimap-stream))))
 390            login-result credentials)
 391       (when nnimap-server-port
 392         (push nnimap-server-port ports))
 393       (let* ((stream-list
 394               (open-protocol-stream
 395                "*nnimap*" (current-buffer) nnimap-address
 396                (nnimap-map-port (car ports))
 397                :type nnimap-stream
 398                :return-list t
 399                :shell-command nnimap-shell-program
 400                :capability-command "1 CAPABILITY\r\n"
 401                :end-of-command "\r\n"
 402                :success " OK "
 403                :starttls-function
 404                (lambda (capabilities)
 405                  (when (gnus-string-match-p "STARTTLS" capabilities)
 406                    "1 STARTTLS\r\n"))))
 407              (stream (car stream-list))
 408              (props (cdr stream-list))
 409              (greeting (plist-get props :greeting))
 410              (capabilities (plist-get props :capabilities))
 411              (stream-type (plist-get props :type)))
 412         (when (and stream (not (memq (process-status stream) '(open run))))
 413           (setq stream nil))
 414
 415         (when (and (fboundp 'set-network-process-option) ;; Not in XEmacs.
 416                    (fboundp 'process-type) ;; Emacs 22 doesn't provide it.
 417                    (eq (process-type stream) 'network))
 418           ;; Use TCP-keepalive so that connections that pass through a NAT
 419           ;; router don't hang when left idle.
 420           (set-network-process-option stream :keepalive t))
 421
 422         (setf (nnimap-process nnimap-object) stream)
 423         (setf (nnimap-stream-type nnimap-object) stream-type)
 424         (if (not stream)
 425             (progn
 426               (nnheader-report 'nnimap "Unable to contact %s:%s via %s"
 427                                nnimap-address (car ports) nnimap-stream)
 428               'no-connect)
 429           (gnus-set-process-query-on-exit-flag stream nil)
 430           (if (not (gnus-string-match-p "[*.] \\(OK\\|PREAUTH\\)" greeting))
 431               (nnheader-report 'nnimap "%s" greeting)
 432             ;; Store the greeting (for debugging purposes).
 433             (setf (nnimap-greeting nnimap-object) greeting)
 434             (setf (nnimap-capabilities nnimap-object)
 435                   (mapcar #'upcase
 436                           (split-string capabilities)))
 437             (unless (gnus-string-match-p "[*.] PREAUTH" greeting)
 438               (if (not (setq credentials
 439                              (if (eq nnimap-authenticator 'anonymous)
 440                                  (list "anonymous"
 441                                        (message-make-address))
 442                                ;; Look for the credentials based on
 443                                ;; the virtual server name and the address
 444                                (nnimap-credentials
 445                                 (gnus-delete-duplicates
 446                                  (list
 447                                   nnimap-address
 448                                   (nnoo-current-server 'nnimap)))
 449                                 ports
 450                                 nnimap-user))))
 451                   (setq nnimap-object nil)
 452                 (let ((nnimap-inhibit-logging t))
 453                   (setq login-result
 454                         (nnimap-login (car credentials) (cadr credentials))))
 455                 (if (car login-result)
 456                     (progn
 457                       ;; Save the credentials if a save function exists
 458                       ;; (such a function will only be passed if a new
 459                       ;; token was created).
 460                       (when (functionp (nth 2 credentials))
 461                         (funcall (nth 2 credentials)))
 462                       ;; See if CAPABILITY is set as part of login
 463                       ;; response.
 464                       (dolist (response (cddr login-result))
 465                         (when (string= "CAPABILITY" (upcase (car response)))
 466                           (setf (nnimap-capabilities nnimap-object)
 467                                 (mapcar #'upcase (cdr response))))))
 468                   ;; If the login failed, then forget the credentials
 469                   ;; that are now possibly cached.
 470                   (dolist (host (list (nnoo-current-server 'nnimap)
 471                                       nnimap-address))
 472                     (dolist (port ports)
 473                       (auth-source-forget+ :host host :port port)))
 474                   (delete-process (nnimap-process nnimap-object))
 475                   (setq nnimap-object nil))))
 476             (when nnimap-object
 477               (when (nnimap-capability "QRESYNC")
 478                 (nnimap-command "ENABLE QRESYNC"))
 479               (nnheader-message 7 "Opening connection to %s...done"
 480                                 nnimap-address)
 481               (nnimap-process nnimap-object))))))))
 482
 483 (autoload 'rfc2104-hash "rfc2104")
 484
 485 (defun nnimap-login (user password)
 486   (cond
 487    ;; Prefer plain LOGIN if it's enabled (since it requires fewer
 488    ;; round trips than CRAM-MD5, and it's less likely to be buggy),
 489    ;; and we're using an encrypted connection.
 490    ((and (not (nnimap-capability "LOGINDISABLED"))
 491          (eq (nnimap-stream-type nnimap-object) 'tls)
 492          (or (null nnimap-authenticator)
 493              (eq nnimap-authenticator 'login)))
 494     (nnimap-command "LOGIN %S %S" user password))
 495    ((and (nnimap-capability "AUTH=CRAM-MD5")
 496          (or (null nnimap-authenticator)
 497              (eq nnimap-authenticator 'cram-md5)))
 498     (erase-buffer)
 499     (let ((sequence (nnimap-send-command "AUTHENTICATE CRAM-MD5"))
 500           (challenge (nnimap-wait-for-line "^\\+\\(.*\\)\n")))
 501       (process-send-string
 502        (get-buffer-process (current-buffer))
 503        (concat
 504         (base64-encode-string
 505          (concat user " "
 506                  (rfc2104-hash 'md5 64 16 password
 507                                (base64-decode-string challenge))))
 508         "\r\n"))
 509       (nnimap-wait-for-response sequence)))
 510    ((and (not (nnimap-capability "LOGINDISABLED"))
 511          (or (null nnimap-authenticator)
 512              (eq nnimap-authenticator 'login)))
 513     (nnimap-command "LOGIN %S %S" user password))
 514    ((and (nnimap-capability "AUTH=PLAIN")
 515          (or (null nnimap-authenticator)
 516              (eq nnimap-authenticator 'plain)))
 517     (nnimap-command
 518      "AUTHENTICATE PLAIN %s"
 519      (base64-encode-string
 520       (format "\000%s\000%s"
 521               (nnimap-quote-specials user)
 522               (nnimap-quote-specials password)))))))
 523
 524 (defun nnimap-quote-specials (string)
 525   (with-temp-buffer
 526     (insert string)
 527     (goto-char (point-min))
 528     (while (re-search-forward "[\\\"]" nil t)
 529       (forward-char -1)
 530       (insert "\\")
 531       (forward-char 1))
 532     (buffer-string)))
 533
 534 (defun nnimap-find-parameter (parameter elems)
 535   (let (result)
 536     (dolist (elem elems)
 537       (cond
 538        ((equal (car elem) parameter)
 539         (setq result (cdr elem)))
 540        ((and (equal (car elem) "OK")
 541              (consp (cadr elem))
 542              (equal (caadr elem) parameter))
 543         (setq result (cdr (cadr elem))))))
 544     result))
 545
 546 (deffoo nnimap-close-server (&optional server)
 547   (when (nnoo-change-server 'nnimap server nil)
 548     (ignore-errors
 549       (delete-process (get-buffer-process (nnimap-buffer))))
 550     (nnoo-close-server 'nnimap server)
 551     t))
 552
 553 (deffoo nnimap-request-close ()
 554   t)
 555
 556 (deffoo nnimap-server-opened (&optional server)
 557   (and (nnoo-current-server-p 'nnimap server)
 558        nntp-server-buffer
 559        (gnus-buffer-live-p nntp-server-buffer)
 560        (nnimap-find-connection nntp-server-buffer)))
 561
 562 (deffoo nnimap-status-message (&optional server)
 563   nnimap-status-string)
 564
 565 (deffoo nnimap-request-article (article &optional group server to-buffer)
 566   (when group
 567     (setq group (nnimap-decode-gnus-group group)))
 568   (with-current-buffer nntp-server-buffer
 569     (let ((result (nnimap-possibly-change-group group server))
 570           parts structure)
 571       (when (stringp article)
 572         (setq article (nnimap-find-article-by-message-id group article)))
 573       (when (and result
 574                  article)
 575         (erase-buffer)
 576         (with-current-buffer (nnimap-buffer)
 577           (erase-buffer)
 578           (when nnimap-fetch-partial-articles
 579             (nnimap-command "UID FETCH %d (BODYSTRUCTURE)" article)
 580             (goto-char (point-min))
 581             (when (re-search-forward "FETCH.*BODYSTRUCTURE" nil t)
 582               (setq structure (ignore-errors
 583                                 (let ((start (point)))
 584                                   (forward-sexp 1)
 585                                   (downcase-region start (point))
 586                                   (goto-char start)
 587                                   (read (current-buffer))))
 588                     parts (nnimap-find-wanted-parts structure))))
 589           (when (if parts
 590                     (nnimap-get-partial-article article parts structure)
 591                   (nnimap-get-whole-article article))
 592             (let ((buffer (current-buffer)))
 593               (with-current-buffer (or to-buffer nntp-server-buffer)
 594                 (nnheader-insert-buffer-substring buffer)
 595                 (nnheader-ms-strip-cr)))
 596             (cons group article)))))))
 597
 598 (deffoo nnimap-request-head (article &optional group server to-buffer)
 599   (when group
 600     (setq group (nnimap-decode-gnus-group group)))
 601   (when (nnimap-possibly-change-group group server)
 602     (with-current-buffer (nnimap-buffer)
 603       (when (stringp article)
 604         (setq article (nnimap-find-article-by-message-id group article)))
 605       (if (null article)
 606           nil
 607         (nnimap-get-whole-article
 608          article (format "UID FETCH %%d %s"
 609                          (nnimap-header-parameters)))
 610         (let ((buffer (current-buffer)))
 611           (with-current-buffer (or to-buffer nntp-server-buffer)
 612             (erase-buffer)
 613             (insert-buffer-substring buffer)
 614             (nnheader-ms-strip-cr)
 615             (cons group article)))))))
 616
 617 (defun nnimap-get-whole-article (article &optional command)
 618   (let ((result
 619          (nnimap-command
 620           (or command
 621               (if (nnimap-ver4-p)
 622                   "UID FETCH %d BODY.PEEK[]"
 623                 "UID FETCH %d RFC822.PEEK"))
 624           article)))
 625     ;; Check that we really got an article.
 626     (goto-char (point-min))
 627     (unless (re-search-forward "\\* [0-9]+ FETCH" nil t)
 628       (setq result nil))
 629     (when result
 630       ;; Remove any data that may have arrived before the FETCH data.
 631       (beginning-of-line)
 632       (unless (bobp)
 633         (delete-region (point-min) (point)))
 634       (let ((bytes (nnimap-get-length)))
 635         (delete-region (line-beginning-position)
 636                        (progn (forward-line 1) (point)))
 637         (goto-char (+ (point) bytes))
 638         (delete-region (point) (point-max)))
 639       t)))
 640
 641 (defun nnimap-capability (capability)
 642   (member capability (nnimap-capabilities nnimap-object)))
 643
 644 (defun nnimap-ver4-p ()
 645   (nnimap-capability "IMAP4REV1"))
 646
 647 (defun nnimap-get-partial-article (article parts structure)
 648   (let ((result
 649          (nnimap-command
 650           "UID FETCH %d (%s %s)"
 651           article
 652           (if (nnimap-ver4-p)
 653               "BODY.PEEK[HEADER]"
 654             "RFC822.HEADER")
 655           (if (nnimap-ver4-p)
 656               (mapconcat (lambda (part)
 657                            (format "BODY.PEEK[%s]" part))
 658                          parts " ")
 659             (mapconcat (lambda (part)
 660                          (format "RFC822.PEEK[%s]" part))
 661                        parts " ")))))
 662     (when result
 663       (nnimap-convert-partial-article structure))))
 664
 665 (defun nnimap-convert-partial-article (structure)
 666   ;; First just skip past the headers.
 667   (goto-char (point-min))
 668   (let ((bytes (nnimap-get-length))
 669         id parts)
 670     ;; Delete "FETCH" line.
 671     (delete-region (line-beginning-position)
 672                    (progn (forward-line 1) (point)))
 673     (goto-char (+ (point) bytes))
 674     ;; Collect all the body parts.
 675     (while (looking-at ".*BODY\\[\\([.0-9]+\\)\\]")
 676       (setq id (match-string 1)
 677             bytes (or (nnimap-get-length) 0))
 678       (beginning-of-line)
 679       (delete-region (point) (progn (forward-line 1) (point)))
 680       (push (list id (buffer-substring (point) (+ (point) bytes)))
 681             parts)
 682       (delete-region (point) (+ (point) bytes)))
 683     ;; Delete trailing junk.
 684     (delete-region (point) (point-max))
 685     ;; Now insert all the parts again where they fit in the structure.
 686     (nnimap-insert-partial-structure structure parts)
 687     t))
 688
 689 (defun nnimap-insert-partial-structure (structure parts &optional subp)
 690   (let (type boundary)
 691     (let ((bstruc structure))
 692       (while (consp (car bstruc))
 693         (pop bstruc))
 694       (setq type (car bstruc))
 695       (setq bstruc (car (cdr bstruc)))
 696       (let ((has-boundary (member "boundary" bstruc)))
 697         (when has-boundary
 698           (setq boundary (cadr has-boundary)))))
 699     (when subp
 700       (insert (format "Content-type: multipart/%s; boundary=%S\n\n"
 701                       (downcase type) boundary)))
 702     (while (not (stringp (car structure)))
 703       (insert "\n--" boundary "\n")
 704       (if (consp (caar structure))
 705           (nnimap-insert-partial-structure (pop structure) parts t)
 706         (let ((bit (pop structure)))
 707           (insert (format "Content-type: %s/%s"
 708                           (downcase (nth 0 bit))
 709                           (downcase (nth 1 bit))))
 710           (if (member-ignore-case "CHARSET" (nth 2 bit))
 711               (insert (format
 712                        "; charset=%S\n"
 713                        (cadr (member-ignore-case "CHARSET" (nth 2 bit)))))
 714             (insert "\n"))
 715           (insert (format "Content-transfer-encoding: %s\n"
 716                           (nth 5 bit)))
 717           (insert "\n")
 718           (when (assoc (nth 9 bit) parts)
 719             (insert (cadr (assoc (nth 9 bit) parts)))))))
 720     (insert "\n--" boundary "--\n")))
 721
 722 (defun nnimap-find-wanted-parts (structure)
 723   (message-flatten-list (nnimap-find-wanted-parts-1 structure "")))
 724
 725 (defun nnimap-find-wanted-parts-1 (structure prefix)
 726   (let ((num 1)
 727         parts)
 728     (while (consp (car structure))
 729       (let ((sub (pop structure)))
 730         (if (consp (car sub))
 731             (push (nnimap-find-wanted-parts-1
 732                    sub (if (string= prefix "")
 733                            (number-to-string num)
 734                          (format "%s.%s" prefix num)))
 735                   parts)
 736           (let ((type (format "%s/%s" (nth 0 sub) (nth 1 sub)))
 737                 (id (if (string= prefix "")
 738                         (number-to-string num)
 739                       (format "%s.%s" prefix num))))
 740             (setcar (nthcdr 9 sub) id)
 741             (when (if (eq nnimap-fetch-partial-articles t)
 742                       (equal id "1")
 743                     (string-match nnimap-fetch-partial-articles type))
 744               (push id parts))))
 745         (incf num)))
 746     (nreverse parts)))
 747
 748 (defun nnimap-decode-gnus-group (group)
 749   (decode-coding-string group 'utf-8))
 750
 751 (deffoo nnimap-request-group (group &optional server dont-check info)
 752   (setq group (nnimap-decode-gnus-group group))
 753   (let ((result (nnimap-possibly-change-group
 754                  ;; Don't SELECT the group if we're going to select it
 755                  ;; later, anyway.
 756                  (if (and (not dont-check)
 757                           (assoc group nnimap-current-infos))
 758                      nil
 759                    group)
 760                  server))
 761         articles active marks high low)
 762     (with-current-buffer nntp-server-buffer
 763       (when result
 764         (if (and dont-check
 765                  (setq active (nth 2 (assoc group nnimap-current-infos))))
 766             (insert (format "211 %d %d %d %S\n"
 767                             (- (cdr active) (car active))
 768                             (car active)
 769                             (cdr active)
 770                             group))
 771           (with-current-buffer (nnimap-buffer)
 772             (erase-buffer)
 773             (let ((group-sequence
 774                    (nnimap-send-command "SELECT %S" (utf7-encode group t)))
 775                   (flag-sequence
 776                    (nnimap-send-command "UID FETCH 1:* FLAGS")))
 777               (setf (nnimap-group nnimap-object) group)
 778               (nnimap-wait-for-response flag-sequence)
 779               (setq marks
 780                     (nnimap-flags-to-marks
 781                      (nnimap-parse-flags
 782                       (list (list group-sequence flag-sequence
 783                                   1 group "SELECT")))))
 784               (when (and info
 785                          marks)
 786                 (nnimap-update-infos marks (list info))
 787                 (nnimap-store-info info (gnus-active (gnus-info-group info))))
 788               (goto-char (point-max))
 789               (let ((uidnext (nth 5 (car marks))))
 790                 (setq high (or (if uidnext
 791                                    (1- uidnext)
 792                                  (nth 3 (car marks)))
 793                                0)
 794                       low (or (nth 4 (car marks)) uidnext 1)))))
 795           (erase-buffer)
 796           (insert
 797            (format
 798             "211 %d %d %d %S\n" (1+ (- high low)) low high group)))
 799         t))))
 800
 801 (deffoo nnimap-request-create-group (group &optional server args)
 802   (setq group (nnimap-decode-gnus-group group))
 803   (when (nnimap-possibly-change-group nil server)
 804     (with-current-buffer (nnimap-buffer)
 805       (car (nnimap-command "CREATE %S" (utf7-encode group t))))))
 806
 807 (deffoo nnimap-request-delete-group (group &optional force server)
 808   (setq group (nnimap-decode-gnus-group group))
 809   (when (nnimap-possibly-change-group nil server)
 810     (with-current-buffer (nnimap-buffer)
 811       (car (nnimap-command "DELETE %S" (utf7-encode group t))))))
 812
 813 (deffoo nnimap-request-rename-group (group new-name &optional server)
 814   (setq group (nnimap-decode-gnus-group group))
 815   (when (nnimap-possibly-change-group nil server)
 816     (with-current-buffer (nnimap-buffer)
 817       (nnimap-unselect-group)
 818       (car (nnimap-command "RENAME %S %S"
 819                            (utf7-encode group t) (utf7-encode new-name t))))))
 820
 821 (defun nnimap-unselect-group ()
 822   ;; Make sure we don't have this group open read/write by asking
 823   ;; to examine a mailbox that doesn't exist.  This seems to be
 824   ;; the only way that allows us to reliably go back to unselected
 825   ;; state on Courier.
 826   (nnimap-command "EXAMINE DOES.NOT.EXIST"))
 827
 828 (deffoo nnimap-request-expunge-group (group &optional server)
 829   (setq group (nnimap-decode-gnus-group group))
 830   (when (nnimap-possibly-change-group group server)
 831     (with-current-buffer (nnimap-buffer)
 832       (car (nnimap-command "EXPUNGE")))))
 833
 834 (defun nnimap-get-flags (spec)
 835   (let ((articles nil)
 836         elems end)
 837     (with-current-buffer (nnimap-buffer)
 838       (erase-buffer)
 839       (nnimap-wait-for-response (nnimap-send-command
 840                                  "UID FETCH %s FLAGS" spec))
 841       (setq end (point))
 842       (subst-char-in-region (point-min) (point-max)
 843                             ?\\ ?% t)
 844       (goto-char (point-min))
 845       (while (search-forward " FETCH " end t)
 846         (setq elems (read (current-buffer)))
 847         (push (cons (cadr (memq 'UID elems))
 848                     (cadr (memq 'FLAGS elems)))
 849               articles)))
 850     (nreverse articles)))
 851
 852 (deffoo nnimap-close-group (group &optional server)
 853   t)
 854
 855 (deffoo nnimap-request-move-article (article group server accept-form
 856                                              &optional last internal-move-group)
 857   (setq group (nnimap-decode-gnus-group group))
 858   (with-temp-buffer
 859     (mm-disable-multibyte)
 860     (when (funcall (if internal-move-group
 861                        'nnimap-request-head
 862                      'nnimap-request-article)
 863                    article group server (current-buffer))
 864       ;; If the move is internal (on the same server), just do it the easy
 865       ;; way.
 866       (let ((message-id (message-field-value "message-id")))
 867         (if internal-move-group
 868             (let ((result
 869                    (with-current-buffer (nnimap-buffer)
 870                      (nnimap-command "UID COPY %d %S"
 871                                      article
 872                                      (utf7-encode internal-move-group t)))))
 873               (when (car result)
 874                 (nnimap-delete-article article)
 875                 (cons internal-move-group
 876                       (or (nnimap-find-uid-response "COPYUID" (cadr result))
 877                           (nnimap-find-article-by-message-id
 878                            internal-move-group message-id)))))
 879           ;; Move the article to a different method.
 880           (let ((result (eval accept-form)))
 881             (when result
 882               (nnimap-possibly-change-group group server)
 883               (nnimap-delete-article article)
 884               result)))))))
 885
 886 (deffoo nnimap-request-expire-articles (articles group &optional server force)
 887   (setq group (nnimap-decode-gnus-group group))
 888   (cond
 889    ((null articles)
 890     nil)
 891    ((not (nnimap-possibly-change-group group server))
 892     articles)
 893    ((and force
 894          (eq nnmail-expiry-target 'delete))
 895     (unless (nnimap-delete-article (gnus-compress-sequence articles))
 896       (nnheader-message 7 "Article marked for deletion, but not expunged."))
 897     nil)
 898    (t
 899     (let ((deletable-articles
 900            (if (or force
 901                    (eq nnmail-expiry-wait 'immediate))
 902                articles
 903              (gnus-sorted-intersection
 904               articles
 905               (nnimap-find-expired-articles group)))))
 906       (if (null deletable-articles)
 907           articles
 908         (if (eq nnmail-expiry-target 'delete)
 909             (nnimap-delete-article (gnus-compress-sequence deletable-articles))
 910           (setq deletable-articles
 911                 (nnimap-process-expiry-targets
 912                  deletable-articles group server)))
 913         ;; Return the articles we didn't delete.
 914         (gnus-sorted-complement articles deletable-articles))))))
 915
 916 (defun nnimap-process-expiry-targets (articles group server)
 917   (let ((deleted-articles nil))
 918     (cond
 919      ;; shortcut further processing if we're going to delete the articles
 920      ((eq nnmail-expiry-target 'delete)
 921       (setq deleted-articles articles)
 922       t)
 923      ;; or just move them to another folder on the same IMAP server
 924      ((and (not (functionp nnmail-expiry-target))
 925            (gnus-server-equal (gnus-group-method nnmail-expiry-target)
 926                               (gnus-server-to-method
 927                                (format "nnimap:%s" server))))
 928       (and (nnimap-possibly-change-group group server)
 929            (with-current-buffer (nnimap-buffer)
 930              (nnheader-message 7 "Expiring articles from %s: %s" group articles)
 931              (nnimap-command
 932               "UID COPY %s %S"
 933               (nnimap-article-ranges (gnus-compress-sequence articles))
 934               (utf7-encode (gnus-group-real-name nnmail-expiry-target) t))
 935              (setq deleted-articles articles)))
 936       t)
 937      (t
 938       (dolist (article articles)
 939         (let ((target nnmail-expiry-target))
 940           (with-temp-buffer
 941             (mm-disable-multibyte)
 942             (when (nnimap-request-article article group server (current-buffer))
 943               (when (functionp target)
 944                 (setq target (funcall target group)))
 945               (if (and target
 946                        (not (eq target 'delete)))
 947                   (if (or (gnus-request-group target t)
 948                           (gnus-request-create-group target))
 949                       (progn
 950                         (nnmail-expiry-target-group target group)
 951                         (nnheader-message 7 "Expiring article %s:%d to %s"
 952                                           group article target))
 953                     (setq target nil))
 954                 (nnheader-message 7 "Expiring article %s:%d" group article))
 955               (when target
 956                 (push article deleted-articles))))))))
 957     ;; Change back to the current group again.
 958     (nnimap-possibly-change-group group server)
 959     (setq deleted-articles (nreverse deleted-articles))
 960     (nnimap-delete-article (gnus-compress-sequence deleted-articles))
 961     deleted-articles))
 962
 963 (defun nnimap-find-expired-articles (group)
 964   (let ((cutoff (nnmail-expired-article-p group nil nil)))
 965     (with-current-buffer (nnimap-buffer)
 966       (let ((result
 967              (nnimap-command
 968               "UID SEARCH SENTBEFORE %s"
 969               (format-time-string
 970                (format "%%d-%s-%%Y"
 971                        (upcase
 972                         (car (rassoc (nth 4 (decode-time cutoff))
 973                                      parse-time-months))))
 974                cutoff))))
 975         (and (car result)
 976              (delete 0 (mapcar #'string-to-number
 977                                (cdr (assoc "SEARCH" (cdr result))))))))))
 978
 979
 980 (defun nnimap-find-article-by-message-id (group message-id)
 981   (with-current-buffer (nnimap-buffer)
 982     (erase-buffer)
 983     (unless (or (not group) (equal group (nnimap-group nnimap-object)))
 984       (setf (nnimap-group nnimap-object) nil)
 985       (setf (nnimap-examined nnimap-object) group)
 986       (nnimap-send-command "EXAMINE %S" (utf7-encode group t)))
 987     (let ((sequence
 988            (nnimap-send-command "UID SEARCH HEADER Message-Id %S" message-id))
 989           article result)
 990       (setq result (nnimap-wait-for-response sequence))
 991       (when (and result
 992                  (car (setq result (nnimap-parse-response))))
 993         ;; Select the last instance of the message in the group.
 994         (and (setq article
 995                    (car (last (cdr (assoc "SEARCH" (cdr result))))))
 996              (string-to-number article))))))
 997
 998 (defun nnimap-delete-article (articles)
 999   (with-current-buffer (nnimap-buffer)
1000     (nnimap-command "UID STORE %s +FLAGS.SILENT (\\Deleted)"
1001                     (nnimap-article-ranges articles))
1002     (cond
1003      ((nnimap-capability "UIDPLUS")
1004       (nnimap-command "UID EXPUNGE %s"
1005                       (nnimap-article-ranges articles))
1006       t)
1007      (nnimap-expunge
1008       (nnimap-command "EXPUNGE")
1009       t)
1010      (t (gnus-message 7 (concat "nnimap: nnimap-expunge is not set and the "
1011                                 "server doesn't support UIDPLUS, so we won't "
1012                                 "delete this article now"))))))
1013
1014 (deffoo nnimap-request-scan (&optional group server)
1015   (when group
1016     (setq group (nnimap-decode-gnus-group group)))
1017   (when (and (nnimap-possibly-change-group nil server)
1018              nnimap-inbox
1019              nnimap-split-methods)
1020     (nnheader-message 7 "nnimap %s splitting mail..." server)
1021     (nnimap-split-incoming-mail)
1022     (nnheader-message 7 "nnimap %s splitting mail...done" server)))
1023
1024 (defun nnimap-marks-to-flags (marks)
1025   (let (flags flag)
1026     (dolist (mark marks)
1027       (when (setq flag (cadr (assq mark nnimap-mark-alist)))
1028         (push flag flags)))
1029     flags))
1030
1031 (deffoo nnimap-request-update-group-status (group status &optional server)
1032   (setq group (nnimap-decode-gnus-group group))
1033   (when (nnimap-possibly-change-group nil server)
1034     (let ((command (assoc
1035                     status
1036                     '((subscribe "SUBSCRIBE")
1037                       (unsubscribe "UNSUBSCRIBE")))))
1038       (when command
1039         (with-current-buffer (nnimap-buffer)
1040           (nnimap-command "%s %S" (cadr command) (utf7-encode group t)))))))
1041
1042 (deffoo nnimap-request-set-mark (group actions &optional server)
1043   (setq group (nnimap-decode-gnus-group group))
1044   (when (nnimap-possibly-change-group group server)
1045     (let (sequence)
1046       (with-current-buffer (nnimap-buffer)
1047         (erase-buffer)
1048         ;; Just send all the STORE commands without waiting for
1049         ;; response.  If they're successful, they're successful.
1050         (dolist (action actions)
1051           (destructuring-bind (range action marks) action
1052             (let ((flags (nnimap-marks-to-flags marks)))
1053               (when flags
1054                 (setq sequence (nnimap-send-command
1055                                 "UID STORE %s %sFLAGS.SILENT (%s)"
1056                                 (nnimap-article-ranges range)
1057                                 (cond
1058                                  ((eq action 'del) "-")
1059                                  ((eq action 'add) "+")
1060                                  ((eq action 'set) ""))
1061                                 (mapconcat #'identity flags " ")))))))
1062         ;; Wait for the last command to complete to avoid later
1063         ;; synchronization problems with the stream.
1064         (when sequence
1065           (nnimap-wait-for-response sequence))))))
1066
1067 (deffoo nnimap-request-accept-article (group &optional server last)
1068   (setq group (nnimap-decode-gnus-group group))
1069   (when (nnimap-possibly-change-group nil server)
1070     (nnmail-check-syntax)
1071     (let ((message-id (message-field-value "message-id"))
1072           sequence message)
1073       (nnimap-add-cr)
1074       (setq message (buffer-substring-no-properties (point-min) (point-max)))
1075       (with-current-buffer (nnimap-buffer)
1076         (when (setq message (or (nnimap-process-quirk "OK Gimap " 'append message)
1077                                 message))
1078           ;; If we have this group open read-only, then unselect it
1079           ;; before appending to it.
1080           (when (equal (nnimap-examined nnimap-object) group)
1081             (nnimap-unselect-group))
1082           (erase-buffer)
1083           (setq sequence (nnimap-send-command
1084                           "APPEND %S {%d}" (utf7-encode group t)
1085                           (length message)))
1086           (unless nnimap-streaming
1087             (nnimap-wait-for-connection "^[+]"))
1088           (process-send-string (get-buffer-process (current-buffer)) message)
1089           (process-send-string (get-buffer-process (current-buffer))
1090                                (if (nnimap-newlinep nnimap-object)
1091                                    "\n"
1092                                  "\r\n"))
1093           (let ((result (nnimap-get-response sequence)))
1094             (if (not (nnimap-ok-p result))
1095                 (progn
1096                   (nnheader-report 'nnimap "%s" result)
1097                   nil)
1098               (cons group
1099                     (or (nnimap-find-uid-response "APPENDUID" (car result))
1100                         (nnimap-find-article-by-message-id
1101                          group message-id))))))))))
1102
1103 (defun nnimap-process-quirk (greeting-match type data)
1104   (when (and (nnimap-greeting nnimap-object)
1105              (string-match greeting-match (nnimap-greeting nnimap-object))
1106              (eq type 'append)
1107              (string-match "\000" data))
1108     (let ((choice (gnus-multiple-choice
1109                    "Message contains NUL characters.  Delete, continue, abort? "
1110                    '((?d "Delete NUL characters")
1111                      (?c "Try to APPEND the message as is")
1112                      (?a "Abort")))))
1113       (cond
1114        ((eq choice ?a)
1115         (nnheader-report 'nnimap "Aborted APPEND due to NUL characters"))
1116        ((eq choice ?c)
1117         data)
1118        (t
1119         (with-temp-buffer
1120           (insert data)
1121           (goto-char (point-min))
1122           (while (search-forward "\000" nil t)
1123             (replace-match "" t t))
1124           (buffer-string)))))))
1125
1126 (defun nnimap-ok-p (value)
1127   (and (consp value)
1128        (consp (car value))
1129        (equal (caar value) "OK")))
1130
1131 (defun nnimap-find-uid-response (name list)
1132   (let ((result (car (last (nnimap-find-response-element name list)))))
1133     (and result
1134          (string-to-number result))))
1135
1136 (defun nnimap-find-response-element (name list)
1137   (let (result)
1138     (dolist (elem list)
1139       (when (and (consp elem)
1140                  (equal name (car elem)))
1141         (setq result elem)))
1142     result))
1143
1144 (deffoo nnimap-request-replace-article (article group buffer)
1145   (setq group (nnimap-decode-gnus-group group))
1146   (let (group-art)
1147     (when (and (nnimap-possibly-change-group group nil)
1148                ;; Put the article into the group.
1149                (with-current-buffer buffer
1150                  (setq group-art
1151                        (nnimap-request-accept-article group nil t))))
1152       (nnimap-delete-article (list article))
1153       ;; Return the new article number.
1154       (cdr group-art))))
1155
1156 (defun nnimap-add-cr ()
1157   (goto-char (point-min))
1158   (while (re-search-forward "\r?\n" nil t)
1159     (replace-match "\r\n" t t)))
1160
1161 (defun nnimap-get-groups ()
1162   (erase-buffer)
1163   (let ((sequence (nnimap-send-command "LIST \"\" \"*\""))
1164         groups)
1165     (nnimap-wait-for-response sequence)
1166     (subst-char-in-region (point-min) (point-max)
1167                           ?\\ ?% t)
1168     (goto-char (point-min))
1169     (nnimap-unfold-quoted-lines)
1170     (goto-char (point-min))
1171     (while (search-forward "* LIST " nil t)
1172       (let ((flags (read (current-buffer)))
1173             (separator (read (current-buffer)))
1174             (group (read (current-buffer))))
1175         (unless (member '%NoSelect flags)
1176           (push (utf7-decode (if (stringp group)
1177                                  group
1178                                (format "%s" group)) t)
1179                 groups))))
1180     (nreverse groups)))
1181
1182 (deffoo nnimap-request-list (&optional server)
1183   (when (nnimap-possibly-change-group nil server)
1184     (with-current-buffer nntp-server-buffer
1185       (erase-buffer)
1186       (let ((groups
1187              (with-current-buffer (nnimap-buffer)
1188                (nnimap-get-groups)))
1189             sequences responses)
1190         (when groups
1191           (with-current-buffer (nnimap-buffer)
1192             (setf (nnimap-group nnimap-object) nil)
1193             (dolist (group groups)
1194               (setf (nnimap-examined nnimap-object) group)
1195               (push (list (nnimap-send-command "EXAMINE %S"
1196                                                (utf7-encode group t))
1197                           group)
1198                     sequences))
1199             (nnimap-wait-for-response (caar sequences))
1200             (setq responses
1201                   (nnimap-get-responses (mapcar #'car sequences))))
1202           (dolist (response responses)
1203             (let* ((sequence (car response))
1204                    (response (cadr response))
1205                    (group (cadr (assoc sequence sequences)))
1206                    (egroup (encode-coding-string group 'utf-8)))
1207               (when (and group
1208                          (equal (caar response) "OK"))
1209                 (let ((uidnext (nnimap-find-parameter "UIDNEXT" response))
1210                       highest exists)
1211                   (dolist (elem response)
1212                     (when (equal (cadr elem) "EXISTS")
1213                       (setq exists (string-to-number (car elem)))))
1214                   (when uidnext
1215                     (setq highest (1- (string-to-number (car uidnext)))))
1216                   (cond
1217                    ((null highest)
1218                     (insert (format "%S 0 1 y\n" egroup)))
1219                    ((zerop exists)
1220                     ;; Empty group.
1221                     (insert (format "%S %d %d y\n" egroup
1222                                     highest (1+ highest))))
1223                    (t
1224                     ;; Return the widest possible range.
1225                     (insert (format "%S %d 1 y\n" egroup
1226                                     (or highest exists)))))))))
1227           t)))))
1228
1229 (deffoo nnimap-request-newgroups (date &optional server)
1230   (when (nnimap-possibly-change-group nil server)
1231     (with-current-buffer nntp-server-buffer
1232       (erase-buffer)
1233       (dolist (group (with-current-buffer (nnimap-buffer)
1234                        (nnimap-get-groups)))
1235         (unless (assoc group nnimap-current-infos)
1236           ;; Insert dummy numbers here -- they don't matter.
1237           (insert (format "%S 0 1 y\n" (encode-coding-string group 'utf-8)))))
1238       t)))
1239
1240 (deffoo nnimap-retrieve-group-data-early (server infos)
1241   (when (and (nnimap-possibly-change-group nil server)
1242              infos)
1243     (with-current-buffer (nnimap-buffer)
1244       (erase-buffer)
1245       (setf (nnimap-group nnimap-object) nil)
1246       (setf (nnimap-initial-resync nnimap-object) 0)
1247       (let ((qresyncp (nnimap-capability "QRESYNC"))
1248             params groups sequences active uidvalidity modseq group)
1249         ;; Go through the infos and gather the data needed to know
1250         ;; what and how to request the data.
1251         (dolist (info infos)
1252           (setq params (gnus-info-params info)
1253                 group (nnimap-decode-gnus-group
1254                        (gnus-group-real-name (gnus-info-group info)))
1255                 active (cdr (assq 'active params))
1256                 uidvalidity (cdr (assq 'uidvalidity params))
1257                 modseq (cdr (assq 'modseq params)))
1258           (setf (nnimap-examined nnimap-object) group)
1259           (if (and qresyncp
1260                    uidvalidity
1261                    active
1262                    modseq)
1263               (push
1264                (list (nnimap-send-command "EXAMINE %S (%s (%s %s))"
1265                                           (utf7-encode group t)
1266                                           (nnimap-quirk "QRESYNC")
1267                                           uidvalidity modseq)
1268                      'qresync
1269                      nil group 'qresync)
1270                sequences)
1271             (let ((command
1272                    (if uidvalidity
1273                        "EXAMINE"
1274                      ;; If we don't have a UIDVALIDITY, then this is
1275                      ;; the first time we've seen the group, so we
1276                      ;; have to do a SELECT (which is slower than an
1277                      ;; examine), but will tell us whether the group
1278                      ;; is read-only or not.
1279                      "SELECT"))
1280                   start)
1281               (if (and active uidvalidity)
1282                   ;; Fetch the last 100 flags.
1283                   (setq start (max 1 (- (cdr active) 100)))
1284                 (setf (nnimap-initial-resync nnimap-object)
1285                       (1+ (nnimap-initial-resync nnimap-object)))
1286                 (setq start 1))
1287               (push (list (nnimap-send-command "%s %S" command
1288                                                (utf7-encode group t))
1289                           (nnimap-send-command "UID FETCH %d:* FLAGS" start)
1290                           start group command)
1291                     sequences))))
1292         sequences))))
1293
1294 (defun nnimap-quirk (command)
1295   (let ((quirk (assoc command nnimap-quirks)))
1296     ;; If this server is of a type that matches a quirk, then return
1297     ;; the "quirked" command instead of the proper one.
1298     (if (or (null quirk)
1299             (not (string-match (nth 1 quirk) (nnimap-greeting nnimap-object))))
1300         command
1301       (nth 2 quirk))))
1302
1303 (deffoo nnimap-finish-retrieve-group-infos (server infos sequences)
1304   (when (and sequences
1305              (nnimap-possibly-change-group nil server t)
1306              ;; Check that the process is still alive.
1307              (get-buffer-process (nnimap-buffer))
1308              (memq (process-status (get-buffer-process (nnimap-buffer)))
1309                    '(open run)))
1310     (with-current-buffer (nnimap-buffer)
1311       ;; Wait for the final data to trickle in.
1312       (when (nnimap-wait-for-response (if (eq (cadar sequences) 'qresync)
1313                                           (caar sequences)
1314                                         (cadar sequences))
1315                                       t)
1316         ;; Now we should have most of the data we need, no matter
1317         ;; whether we're QRESYNCING, fetching all the flags from
1318         ;; scratch, or just fetching the last 100 flags per group.
1319         (nnimap-update-infos (nnimap-flags-to-marks
1320                               (nnimap-parse-flags
1321                                (nreverse sequences)))
1322                              infos)
1323         ;; Finally, just return something resembling an active file in
1324         ;; the nntp buffer, so that the agent can save the info, too.
1325         (with-current-buffer nntp-server-buffer
1326           (erase-buffer)
1327           (dolist (info infos)
1328             (let* ((group (gnus-info-group info))
1329                    (active (gnus-active group)))
1330               (when active
1331                 (insert (format "%S %d %d y\n"
1332                                 (decode-coding-string
1333                                  (gnus-group-real-name group) 'utf-8)
1334                                 (cdr active)
1335                                 (car active)))))))))))
1336
1337 (defun nnimap-update-infos (flags infos)
1338   (dolist (info infos)
1339     (let* ((group (nnimap-decode-gnus-group
1340                    (gnus-group-real-name (gnus-info-group info))))
1341            (marks (cdr (assoc group flags))))
1342       (when marks
1343         (nnimap-update-info info marks)))))
1344
1345 (defun nnimap-update-info (info marks)
1346   (destructuring-bind (existing flags high low uidnext start-article
1347                                 permanent-flags uidvalidity
1348                                 vanished highestmodseq) marks
1349     (cond
1350      ;; Ignore groups with no UIDNEXT/marks.  This happens for
1351      ;; completely empty groups.
1352      ((and (not existing)
1353            (not uidnext))
1354       (let ((active (cdr (assq 'active (gnus-info-params info)))))
1355         (when active
1356           (gnus-set-active (gnus-info-group info) active))))
1357      ;; We have a mismatch between the old and new UIDVALIDITY
1358      ;; identifiers, so we have to re-request the group info (the next
1359      ;; time).  This virtually never happens.
1360      ((let ((old-uidvalidity
1361              (cdr (assq 'uidvalidity (gnus-info-params info)))))
1362         (and old-uidvalidity
1363              (not (equal old-uidvalidity uidvalidity))
1364              (or (not start-article)
1365                  (> start-article 1))))
1366       (gnus-group-remove-parameter info 'uidvalidity)
1367       (gnus-group-remove-parameter info 'modseq))
1368      ;; We have the data needed to update.
1369      (t
1370       (let* ((group (gnus-info-group info))
1371              (completep (and start-article
1372                              (= start-article 1)))
1373              (active (or (gnus-active group)
1374                          (cdr (assq 'active (gnus-info-params info))))))
1375         (when uidnext
1376           (setq high (1- uidnext)))
1377         ;; First set the active ranges based on high/low.
1378         (if (or completep
1379                 (not (gnus-active group)))
1380             (gnus-set-active group
1381                              (cond
1382                               (active
1383                                (cons (min (or low (car active))
1384                                           (car active))
1385                                      (max (or high (cdr active))
1386                                           (cdr active))))
1387                               ((and low high)
1388                                (cons low high))
1389                               (uidnext
1390                                ;; No articles in this group.
1391                                (cons uidnext (1- uidnext)))
1392                               (start-article
1393                                (cons start-article (1- start-article)))
1394                               (t
1395                                ;; No articles and no uidnext.
1396                                nil)))
1397           (gnus-set-active group
1398                            (cons (car active)
1399                                  (or high (1- uidnext)))))
1400         ;; See whether this is a read-only group.
1401         (unless (eq permanent-flags 'not-scanned)
1402           (gnus-group-set-parameter
1403            info 'permanent-flags
1404            (and (or (memq '%* permanent-flags)
1405                     (memq '%Seen permanent-flags))
1406                 permanent-flags)))
1407         ;; Update marks and read articles if this isn't a
1408         ;; read-only IMAP group.
1409         (when (setq permanent-flags
1410                     (cdr (assq 'permanent-flags (gnus-info-params info))))
1411           (if (and highestmodseq
1412                    (not start-article))
1413               ;; We've gotten the data by QRESYNCing.
1414               (nnimap-update-qresync-info
1415                info existing (nnimap-imap-ranges-to-gnus-ranges vanished) flags)
1416             ;; Do normal non-QRESYNC flag updates.
1417             ;; Update the list of read articles.
1418             (let* ((unread
1419                     (gnus-compress-sequence
1420                      (gnus-set-difference
1421                       (gnus-set-difference
1422                        existing
1423                        (gnus-sorted-union
1424                         (cdr (assoc '%Seen flags))
1425                         (cdr (assoc '%Deleted flags))))
1426                       (cdr (assoc '%Flagged flags)))))
1427                    (read (gnus-range-difference
1428                           (cons start-article high) unread)))
1429               (when (> start-article 1)
1430                 (setq read
1431                       (gnus-range-nconcat
1432                        (if (> start-article 1)
1433                            (gnus-sorted-range-intersection
1434                             (cons 1 (1- start-article))
1435                             (gnus-info-read info))
1436                          (gnus-info-read info))
1437                        read)))
1438               (when (or (not (listp permanent-flags))
1439                         (memq '%Seen permanent-flags))
1440                 (gnus-info-set-read info read))
1441               ;; Update the marks.
1442               (setq marks (gnus-info-marks info))
1443               (dolist (type (cdr nnimap-mark-alist))
1444                 (when (or (not (listp permanent-flags))
1445                           (memq (car (assoc (caddr type) flags))
1446                                 permanent-flags)
1447                           (memq '%* permanent-flags))
1448                   (let ((old-marks (assoc (car type) marks))
1449                         (new-marks
1450                          (gnus-compress-sequence
1451                           (cdr (or (assoc (caddr type) flags) ; %Flagged
1452                                    (assoc (intern (cadr type) obarray) flags)
1453                                    (assoc (cadr type) flags)))))) ; "\Flagged"
1454                     (setq marks (delq old-marks marks))
1455                     (pop old-marks)
1456                     (when (and old-marks
1457                                (> start-article 1))
1458                       (setq old-marks (gnus-range-difference
1459                                        old-marks
1460                                        (cons start-article high)))
1461                       (setq new-marks (gnus-range-nconcat old-marks new-marks)))
1462                     (when new-marks
1463                       (push (cons (car type) new-marks) marks)))))
1464               (gnus-info-set-marks info marks t))))
1465         ;; Tell Gnus whether there are any \Recent messages in any of
1466         ;; the groups.
1467         (let ((recent (cdr (assoc '%Recent flags))))
1468           (when (and active
1469                      recent
1470                      (> (car (last recent)) (cdr active)))
1471             (push (list (cons (gnus-group-real-name group) 0))
1472                   nnmail-split-history)))
1473         ;; Note the active level for the next run-through.
1474         (gnus-group-set-parameter info 'active (gnus-active group))
1475         (gnus-group-set-parameter info 'uidvalidity uidvalidity)
1476         (gnus-group-set-parameter info 'modseq highestmodseq)
1477         (nnimap-store-info info (gnus-active group)))))))
1478
1479 (defun nnimap-update-qresync-info (info existing vanished flags)
1480   ;; Add all the vanished articles to the list of read articles.
1481   (gnus-info-set-read
1482    info
1483    (gnus-add-to-range
1484     (gnus-add-to-range
1485      (gnus-range-add (gnus-info-read info)
1486                      vanished)
1487      (cdr (assq '%Flagged flags)))
1488     (cdr (assq '%Seen flags))))
1489   (let ((marks (gnus-info-marks info)))
1490     (dolist (type (cdr nnimap-mark-alist))
1491       (let ((ticks (assoc (car type) marks))
1492             (new-marks
1493              (cdr (or (assoc (caddr type) flags) ; %Flagged
1494                       (assoc (intern (cadr type) obarray) flags)
1495                       (assoc (cadr type) flags))))) ; "\Flagged"
1496         (setq marks (delq ticks marks))
1497         (pop ticks)
1498         ;; Add the new marks we got.
1499         (setq ticks (gnus-add-to-range ticks new-marks))
1500         ;; Remove the marks from messages that don't have them.
1501         (setq ticks (gnus-remove-from-range
1502                      ticks
1503                      (gnus-compress-sequence
1504                       (gnus-sorted-complement existing new-marks))))
1505         (when ticks
1506           (push (cons (car type) ticks) marks)))
1507       (gnus-info-set-marks info marks t))))
1508
1509 (defun nnimap-imap-ranges-to-gnus-ranges (irange)
1510   (if (zerop (length irange))
1511       nil
1512     (let ((result nil))
1513       (dolist (elem (split-string irange ","))
1514         (push
1515          (if (string-match ":" elem)
1516              (let ((numbers (split-string elem ":")))
1517                (cons (string-to-number (car numbers))
1518                      (string-to-number (cadr numbers))))
1519            (string-to-number elem))
1520          result))
1521       (nreverse result))))
1522
1523 (defun nnimap-store-info (info active)
1524   (let* ((group (gnus-group-real-name (gnus-info-group info)))
1525          (entry (assoc group nnimap-current-infos)))
1526     (if entry
1527         (setcdr entry (list info active))
1528       (push (list group info active) nnimap-current-infos))))
1529
1530 (defun nnimap-flags-to-marks (groups)
1531   (let (data group totalp uidnext articles start-article mark permanent-flags
1532              uidvalidity vanished highestmodseq)
1533     (dolist (elem groups)
1534       (setq group (car elem)
1535             uidnext (nth 1 elem)
1536             start-article (nth 2 elem)
1537             permanent-flags (nth 3 elem)
1538             uidvalidity (nth 4 elem)
1539             vanished (nth 5 elem)
1540             highestmodseq (nth 6 elem)
1541             articles (nthcdr 7 elem))
1542       (let ((high (caar articles))
1543             marks low existing)
1544         (dolist (article articles)
1545           (setq low (car article))
1546           (push (car article) existing)
1547           (dolist (flag (cdr article))
1548             (setq mark (assoc flag marks))
1549             (if (not mark)
1550                 (push (list flag (car article)) marks)
1551               (setcdr mark (cons (car article) (cdr mark))))))
1552         (push (list group existing marks high low uidnext start-article
1553                     permanent-flags uidvalidity vanished highestmodseq)
1554               data)))
1555     data))
1556
1557 (defun nnimap-parse-flags (sequences)
1558   (goto-char (point-min))
1559   ;; Change \Delete etc to %Delete, so that the Emacs Lisp reader can
1560   ;; read it.
1561   (subst-char-in-region (point-min) (point-max)
1562                         ?\\ ?% t)
1563   ;; Remove any MODSEQ entries in the buffer, because they may contain
1564   ;; numbers that are too large for 32-bit Emacsen.
1565   (while (re-search-forward " MODSEQ ([0-9]+)" nil t)
1566     (replace-match "" t t))
1567   (goto-char (point-min))
1568   (let (start end articles groups uidnext elems permanent-flags
1569               uidvalidity vanished highestmodseq)
1570     (dolist (elem sequences)
1571       (destructuring-bind (group-sequence flag-sequence totalp group command)
1572           elem
1573         (setq start (point))
1574         (when (and
1575                ;; The EXAMINE was successful.
1576                (search-forward (format "\n%d OK " group-sequence) nil t)
1577                (progn
1578                  (forward-line 1)
1579                  (setq end (point))
1580                  (goto-char start)
1581                  (setq permanent-flags
1582                        (if (equal command "SELECT")
1583                            (and (search-forward "PERMANENTFLAGS "
1584                                                 (or end (point-min)) t)
1585                                 (read (current-buffer)))
1586                          'not-scanned))
1587                  (goto-char start)
1588                  (setq uidnext
1589                        (and (search-forward "UIDNEXT "
1590                                             (or end (point-min)) t)
1591                             (read (current-buffer))))
1592                  (goto-char start)
1593                  (setq uidvalidity
1594                        (and (re-search-forward "UIDVALIDITY \\([0-9]+\\)"
1595                                                (or end (point-min)) t)
1596                             ;; Store UIDVALIDITY as a string, as it's
1597                             ;; too big for 32-bit Emacsen, usually.
1598                             (match-string 1)))
1599                  (goto-char start)
1600                  (setq vanished
1601                        (and (eq flag-sequence 'qresync)
1602                             (re-search-forward "^\\* VANISHED .*? \\([0-9:,]+\\)"
1603                                                (or end (point-min)) t)
1604                             (match-string 1)))
1605                  (goto-char start)
1606                  (setq highestmodseq
1607                        (and (re-search-forward "HIGHESTMODSEQ \\([0-9]+\\)"
1608                                             (or end (point-min)) t)
1609                             (match-string 1)))
1610                  (goto-char end)
1611                  (forward-line -1))
1612                ;; The UID FETCH FLAGS was successful.
1613                (or (eq flag-sequence 'qresync)
1614                    (search-forward (format "\n%d OK " flag-sequence) nil t)))
1615           (if (eq flag-sequence 'qresync)
1616               (progn
1617                 (goto-char start)
1618                 (setq start end))
1619             (setq start (point))
1620             (goto-char end))
1621           (while (re-search-forward "^\\* [0-9]+ FETCH " start t)
1622             (let ((p (point)))
1623               (setq elems (read (current-buffer)))
1624               (push (cons (cadr (memq 'UID elems))
1625                           (cadr (memq 'FLAGS elems)))
1626                     articles)))
1627           (push (nconc (list group uidnext totalp permanent-flags uidvalidity
1628                              vanished highestmodseq)
1629                        articles)
1630                 groups)
1631           (if (eq flag-sequence 'qresync)
1632               (goto-char end)
1633             (setq end (point)))
1634           (setq articles nil))))
1635     groups))
1636
1637 (defun nnimap-find-process-buffer (buffer)
1638   (cadr (assoc buffer nnimap-connection-alist)))
1639
1640 (deffoo nnimap-request-post (&optional server)
1641   (setq nnimap-status-string "Read-only server")
1642   nil)
1643
1644 (declare-function gnus-fetch-headers "gnus-sum"
1645                   (articles &optional limit force-new dependencies))
1646
1647 (autoload 'nnir-search-thread "nnir")
1648
1649 (deffoo nnimap-request-thread (header &optional group server)
1650   (when group
1651     (setq group (nnimap-decode-gnus-group group)))
1652   (if gnus-refer-thread-use-nnir
1653       (nnir-search-thread header)
1654     (when (nnimap-possibly-change-group group server)
1655       (let* ((cmd (nnimap-make-thread-query header))
1656              (result (with-current-buffer (nnimap-buffer)
1657                        (nnimap-command  "UID SEARCH %s" cmd))))
1658         (when result
1659           (gnus-fetch-headers
1660            (and (car result)
1661                 (delete 0 (mapcar #'string-to-number
1662                                   (cdr (assoc "SEARCH" (cdr result))))))
1663            nil t))))))
1664
1665 (defun nnimap-possibly-change-group (group server &optional no-reconnect)
1666   (let ((open-result t))
1667     (when (and server
1668                (not (nnimap-server-opened server)))
1669       (setq open-result (nnimap-open-server server nil no-reconnect)))
1670     (cond
1671      ((not open-result)
1672       nil)
1673      ((not group)
1674       t)
1675      (t
1676       (with-current-buffer (nnimap-buffer)
1677         (if (equal group (nnimap-group nnimap-object))
1678             t
1679           (let ((result (nnimap-command "SELECT %S" (utf7-encode group t))))
1680             (when (car result)
1681               (setf (nnimap-group nnimap-object) group
1682                     (nnimap-select-result nnimap-object) result)
1683               result))))))))
1684
1685 (defun nnimap-find-connection (buffer)
1686   "Find the connection delivering to BUFFER."
1687   (let ((entry (assoc buffer nnimap-connection-alist)))
1688     (when entry
1689       (if (and (buffer-name (cadr entry))
1690                (get-buffer-process (cadr entry))
1691                (memq (process-status (get-buffer-process (cadr entry)))
1692                      '(open run)))
1693           (get-buffer-process (cadr entry))
1694         (setq nnimap-connection-alist (delq entry nnimap-connection-alist))
1695         nil))))
1696
1697 (defvar nnimap-sequence 0)
1698
1699 (defun nnimap-send-command (&rest args)
1700   (setf (nnimap-last-command-time nnimap-object) (current-time))
1701   (process-send-string
1702    (get-buffer-process (current-buffer))
1703    (nnimap-log-command
1704     (format "%d %s%s\n"
1705             (incf nnimap-sequence)
1706             (apply #'format args)
1707             (if (nnimap-newlinep nnimap-object)
1708                 ""
1709               "\r"))))
1710   ;; Some servers apparently can't have many outstanding
1711   ;; commands, so throttle them.
1712   (unless nnimap-streaming
1713     (nnimap-wait-for-response nnimap-sequence))
1714   nnimap-sequence)
1715
1716 (defvar nnimap-record-commands nil
1717   "If non-nil, log commands to the \"*imap log*\" buffer.")
1718
1719 (defun nnimap-log-command (command)
1720   (when nnimap-record-commands
1721     (with-current-buffer (get-buffer-create "*imap log*")
1722       (goto-char (point-max))
1723       (insert (format-time-string "%H:%M:%S")
1724               " [" nnimap-address "] "
1725               (if nnimap-inhibit-logging
1726                   "(inhibited)\n"
1727                 command))))
1728   command)
1729
1730 (defun nnimap-command (&rest args)
1731   (erase-buffer)
1732   (let* ((sequence (apply #'nnimap-send-command args))
1733          (response (nnimap-get-response sequence)))
1734     (if (equal (caar response) "OK")
1735         (cons t response)
1736       (nnheader-report 'nnimap "%s"
1737                        (mapconcat (lambda (a)
1738                                     (format "%s" a))
1739                                   (car response) " "))
1740       nil)))
1741
1742 (defun nnimap-get-response (sequence)
1743   (nnimap-wait-for-response sequence)
1744   (nnimap-parse-response))
1745
1746 (defun nnimap-wait-for-connection (&optional regexp)
1747   (nnimap-wait-for-line (or regexp "^[*.] .*\n") "[*.] \\([A-Z0-9]+\\)"))
1748
1749 (defun nnimap-wait-for-line (regexp &optional response-regexp)
1750   (let ((process (get-buffer-process (current-buffer))))
1751     (goto-char (point-min))
1752     (while (and (memq (process-status process)
1753                       '(open run))
1754                 (not (re-search-forward regexp nil t)))
1755       (nnheader-accept-process-output process)
1756       (goto-char (point-min)))
1757     (forward-line -1)
1758     (and (looking-at (or response-regexp regexp))
1759          (match-string 1))))
1760
1761 (defun nnimap-wait-for-response (sequence &optional messagep)
1762   (let ((process (get-buffer-process (current-buffer)))
1763         openp)
1764     (condition-case nil
1765         (progn
1766           (goto-char (point-max))
1767           (while (and (setq openp (memq (process-status process)
1768                                         '(open run)))
1769                       (progn
1770                         ;; Skip past any "*" lines that the server has
1771                         ;; output.
1772                         (while (and (not (bobp))
1773                                     (progn
1774                                       (forward-line -1)
1775                                       (looking-at "\\*"))))
1776                         (not (looking-at (format "%d .*\n" sequence)))))
1777             (when messagep
1778               (nnheader-message-maybe
1779                7 "nnimap read %dk from %s%s" (/ (buffer-size) 1000)
1780                nnimap-address
1781                (if (not (zerop (nnimap-initial-resync nnimap-object)))
1782                    (format " (initial sync of %d group%s; please wait)"
1783                            (nnimap-initial-resync nnimap-object)
1784                            (if (= (nnimap-initial-resync nnimap-object) 1)
1785                                ""
1786                              "s"))
1787                  "")))
1788             (nnheader-accept-process-output process)
1789             (goto-char (point-max)))
1790           (setf (nnimap-initial-resync nnimap-object) 0)
1791           openp)
1792       (quit
1793        (when debug-on-quit
1794          (debug "Quit"))
1795        ;; The user hit C-g while we were waiting: kill the process, in case
1796        ;; it's a gnutls-cli process that's stuck (tends to happen a lot behind
1797        ;; NAT routers).
1798        (delete-process process)
1799        nil))))
1800
1801 (defun nnimap-parse-response ()
1802   (let ((lines (split-string (nnimap-last-response-string) "\r\n" t))
1803         result)
1804     (dolist (line lines)
1805       (push (cdr (nnimap-parse-line line)) result))
1806     ;; Return the OK/error code first, and then all the "continuation
1807     ;; lines" afterwards.
1808     (cons (pop result)
1809           (nreverse result))))
1810
1811 ;; Parse an IMAP response line lightly.  They look like
1812 ;; "* OK [UIDVALIDITY 1164213559] UIDs valid", typically, so parse
1813 ;; the lines into a list of strings and lists of string.
1814 (defun nnimap-parse-line (line)
1815   (let (char result)
1816     (with-temp-buffer
1817       (mm-disable-multibyte)
1818       (insert line)
1819       (goto-char (point-min))
1820       (while (not (eobp))
1821         (if (eql (setq char (following-char)) ? )
1822             (forward-char 1)
1823           (push
1824            (cond
1825             ((eql char ?\[)
1826              (split-string
1827               (buffer-substring
1828                (1+ (point))
1829                (if (search-forward "]" (line-end-position) 'move)
1830                    (1- (point))
1831                  (point)))))
1832             ((eql char ?\()
1833              (split-string
1834               (buffer-substring
1835                (1+ (point))
1836                (if (search-forward ")" (line-end-position) 'move)
1837                    (1- (point))
1838                  (point)))))
1839             ((eql char ?\")
1840              (forward-char 1)
1841              (buffer-substring
1842               (point)
1843               (1- (or (search-forward "\"" (line-end-position) 'move)
1844                       (point)))))
1845             (t
1846              (buffer-substring (point) (if (search-forward " " nil t)
1847                                            (1- (point))
1848                                          (goto-char (point-max))))))
1849            result)))
1850       (nreverse result))))
1851
1852 (defun nnimap-last-response-string ()
1853   (save-excursion
1854     (forward-line 1)
1855     (let ((end (point)))
1856       (forward-line -1)
1857       (when (not (bobp))
1858         (forward-line -1)
1859         (while (and (not (bobp))
1860                     (eql (following-char) ?*))
1861           (forward-line -1))
1862         (unless (eql (following-char) ?*)
1863           (forward-line 1)))
1864       (buffer-substring (point) end))))
1865
1866 (defun nnimap-get-responses (sequences)
1867   (let (responses)
1868     (dolist (sequence sequences)
1869       (goto-char (point-min))
1870       (when (re-search-forward (format "^%d " sequence) nil t)
1871         (push (list sequence (nnimap-parse-response))
1872               responses)))
1873     responses))
1874
1875 (defvar nnimap-incoming-split-list nil)
1876
1877 (defun nnimap-fetch-inbox (articles)
1878   (erase-buffer)
1879   (nnimap-wait-for-response
1880    (nnimap-send-command
1881     "UID FETCH %s %s"
1882     (nnimap-article-ranges articles)
1883     (format "(UID %s%s)"
1884             (format
1885              (if (nnimap-ver4-p)
1886                  "BODY.PEEK"
1887                "RFC822.PEEK"))
1888             (cond
1889              (nnimap-split-download-body-default
1890               "[]")
1891              ((nnimap-ver4-p)
1892               "[HEADER]")
1893              (t
1894               "[1]"))))
1895    t))
1896
1897 (defun nnimap-split-incoming-mail ()
1898   (with-current-buffer (nnimap-buffer)
1899     (let ((nnimap-incoming-split-list nil)
1900           (nnmail-split-methods
1901            (cond
1902             ((eq nnimap-split-methods 'default)
1903              nnmail-split-methods)
1904             (nnimap-split-methods
1905              nnimap-split-methods)
1906             (nnimap-split-fancy
1907              'nnmail-split-fancy)))
1908           (nnmail-split-fancy (or nnimap-split-fancy
1909                                   nnmail-split-fancy))
1910           (nnmail-inhibit-default-split-group t)
1911           (groups (nnimap-get-groups))
1912           new-articles)
1913       (erase-buffer)
1914       (nnimap-command "SELECT %S" nnimap-inbox)
1915       (setf (nnimap-group nnimap-object) nnimap-inbox)
1916       (setq new-articles (nnimap-new-articles (nnimap-get-flags "1:*")))
1917       (when new-articles
1918         (nnimap-fetch-inbox new-articles)
1919         (nnimap-transform-split-mail)
1920         (nnheader-ms-strip-cr)
1921         (nnmail-cache-open)
1922         (nnmail-split-incoming (current-buffer)
1923                                #'nnimap-save-mail-spec
1924                                nil nil
1925                                #'nnimap-dummy-active-number
1926                                #'nnimap-save-mail-spec)
1927         (when nnimap-incoming-split-list
1928           (let ((specs (nnimap-make-split-specs nnimap-incoming-split-list))
1929                 sequences junk-articles)
1930             ;; Create any groups that doesn't already exist on the
1931             ;; server first.
1932             (dolist (spec specs)
1933               (when (and (not (member (car spec) groups))
1934                          (not (eq (car spec) 'junk)))
1935                 (nnimap-command "CREATE %S" (utf7-encode (car spec) t))))
1936             ;; Then copy over all the messages.
1937             (erase-buffer)
1938             (dolist (spec specs)
1939               (let ((group (car spec))
1940                     (ranges (cdr spec)))
1941                 (if (eq group 'junk)
1942                     (setq junk-articles ranges)
1943                   (push (list (nnimap-send-command
1944                                "UID COPY %s %S"
1945                                (nnimap-article-ranges ranges)
1946                                (utf7-encode group t))
1947                               ranges)
1948                         sequences))))
1949             ;; Wait for the last COPY response...
1950             (when sequences
1951               (nnimap-wait-for-response (caar sequences))
1952               ;; And then mark the successful copy actions as deleted,
1953               ;; and possibly expunge them.
1954               (nnimap-mark-and-expunge-incoming
1955                (nnimap-parse-copied-articles sequences)))
1956             (nnimap-mark-and-expunge-incoming junk-articles)))))))
1957
1958 (defun nnimap-mark-and-expunge-incoming (range)
1959   (when range
1960     (setq range (nnimap-article-ranges range))
1961     (erase-buffer)
1962     (let ((sequence
1963            (nnimap-send-command
1964             "UID STORE %s +FLAGS.SILENT (\\Deleted)" range)))
1965       (cond
1966        ;; If the server supports it, we now delete the message we have
1967        ;; just copied over.
1968        ((nnimap-capability "UIDPLUS")
1969         (setq sequence (nnimap-send-command "UID EXPUNGE %s" range)))
1970        ;; If it doesn't support UID EXPUNGE, then we only expunge if the
1971        ;; user has configured it.
1972        (nnimap-expunge
1973         (setq sequence (nnimap-send-command "EXPUNGE"))))
1974       (nnimap-wait-for-response sequence))))
1975
1976 (defun nnimap-parse-copied-articles (sequences)
1977   (let (sequence copied range)
1978     (goto-char (point-min))
1979     (while (re-search-forward "^\\([0-9]+\\) OK\\b" nil t)
1980       (setq sequence (string-to-number (match-string 1)))
1981       (when (setq range (cadr (assq sequence sequences)))
1982         (push (gnus-uncompress-range range) copied)))
1983     (gnus-compress-sequence (sort (apply #'nconc copied) #'<))))
1984
1985 (defun nnimap-new-articles (flags)
1986   (let (new)
1987     (dolist (elem flags)
1988       (unless (gnus-list-memq-of-list nnimap-unsplittable-articles
1989                                       (cdr elem))
1990         (push (car elem) new)))
1991     (gnus-compress-sequence (nreverse new))))
1992
1993 (defun nnimap-make-split-specs (list)
1994   (let ((specs nil)
1995         entry)
1996     (dolist (elem list)
1997       (destructuring-bind (article spec) elem
1998         (dolist (group (delete nil (mapcar #'car spec)))
1999           (unless (setq entry (assoc group specs))
2000             (push (setq entry (list group)) specs))
2001           (setcdr entry (cons article (cdr entry))))))
2002     (dolist (entry specs)
2003       (setcdr entry (gnus-compress-sequence (sort (cdr entry) #'<))))
2004     specs))
2005
2006 (defun nnimap-transform-split-mail ()
2007   (goto-char (point-min))
2008   (let (article bytes)
2009     (block nil
2010       (while (not (eobp))
2011         (while (not (looking-at "\\* [0-9]+ FETCH.+UID \\([0-9]+\\)"))
2012           (delete-region (point) (progn (forward-line 1) (point)))
2013           (when (eobp)
2014             (return)))
2015         (setq article (match-string 1)
2016               bytes (nnimap-get-length))
2017         (delete-region (line-beginning-position) (line-end-position))
2018         ;; Insert MMDF separator, and a way to remember what this
2019         ;; article UID is.
2020         (insert (format "\^A\^A\^A\^A\n\nX-nnimap-article: %s" article))
2021         (forward-char (1+ bytes))
2022         (setq bytes (nnimap-get-length))
2023         (delete-region (line-beginning-position) (line-end-position))
2024         ;; There's a body; skip past that.
2025         (when bytes
2026           (forward-char (1+ bytes))
2027           (delete-region (line-beginning-position) (line-end-position)))))))
2028
2029 (defun nnimap-dummy-active-number (group &optional server)
2030   1)
2031
2032 (defun nnimap-save-mail-spec (group-art &optional server full-nov)
2033   (let (article)
2034     (goto-char (point-min))
2035     (if (not (re-search-forward "X-nnimap-article: \\([0-9]+\\)" nil t))
2036         (error "Invalid nnimap mail")
2037       (setq article (string-to-number (match-string 1))))
2038     (push (list article
2039                 (if (eq group-art 'junk)
2040                     (list (cons 'junk 1))
2041                   group-art))
2042           nnimap-incoming-split-list)))
2043
2044 (defun nnimap-make-thread-query (header)
2045   (let* ((id  (mail-header-id header))
2046          (refs (split-string
2047                 (or (mail-header-references header)
2048                     "")))
2049          (value
2050           (format
2051            "(OR HEADER REFERENCES %S HEADER Message-Id %S)"
2052            id id)))
2053     (dolist (refid refs value)
2054       (setq value (format
2055                    "(OR (OR HEADER Message-Id %S HEADER REFERENCES %S) %s)"
2056                    refid refid value)))))
2057
2058
2059 (provide 'nnimap)
2060
2061 ;;; nnimap.el ends here