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;;; nnimap.el --- IMAP interface for Gnus
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;; Copyright (C) 2010 Free Software Foundation, Inc.
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;; Author: Lars Magne Ingebrigtsen <larsi@gnus.org>
;;         Simon Josefsson <simon@josefsson.org>
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;; This file is part of GNU Emacs.

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;; GNU Emacs is free software: you can redistribute it and/or modify
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;; it under the terms of the GNU General Public License as published by
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;; the Free Software Foundation, either version 3 of the License, or
;; (at your option) any later version.
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;; GNU Emacs is distributed in the hope that it will be useful,
;; but WITHOUT ANY WARRANTY; without even the implied warranty of
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;; MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
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;; GNU General Public License for more details.

;; You should have received a copy of the GNU General Public License
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;; along with GNU Emacs.  If not, see <http://www.gnu.org/licenses/>.
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;;; Commentary:

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;; nnimap interfaces Gnus with IMAP servers.
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;;; Code:

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(eval-and-compile
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  (require 'nnheader))
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(eval-when-compile
  (require 'cl))
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(require 'nnheader)
(require 'gnus-util)
(require 'gnus)
(require 'nnoo)
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(require 'netrc)
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(require 'utf7)
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(require 'tls)
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(require 'parse-time)
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(autoload 'auth-source-forget-user-or-password "auth-source")
(autoload 'auth-source-user-or-password "auth-source")

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(nnoo-declare nnimap)

(defvoo nnimap-address nil
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  "The address of the IMAP server.")
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(defvoo nnimap-server-port nil
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  "The IMAP port used.
If nnimap-stream is `ssl', this will default to `imaps'.  If not,
it will default to `imap'.")

(defvoo nnimap-stream 'ssl
  "How nnimap will talk to the IMAP server.
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Values are `ssl', `network', `starttls' or `shell'.")
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(defvoo nnimap-shell-program (if (boundp 'imap-shell-program)
				 (if (listp imap-shell-program)
				     (car imap-shell-program)
				   imap-shell-program)
			       "ssh %s imapd"))

(defvoo nnimap-inbox nil
  "The mail box where incoming mail arrives and should be split out of.")

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(defvoo nnimap-split-methods nil
  "How mail is split.
Uses the same syntax as nnmail-split-methods")

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(defvoo nnimap-split-fancy nil
  "Uses the same syntax as nnmail-split-fancy.")

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(make-obsolete-variable 'nnimap-split-rule "see `nnimap-split-methods'"
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			"Emacs 24.1")
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(defvoo nnimap-authenticator nil
  "How nnimap authenticate itself to the server.
Possible choices are nil (use default methods) or `anonymous'.")

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(defvoo nnimap-expunge t
  "If non-nil, expunge articles after deleting them.
This is always done if the server supports UID EXPUNGE, but it's
not done by default on servers that doesn't support that command.")

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(defvoo nnimap-streaming t
  "If non-nil, try to use streaming commands with IMAP servers.
Switching this off will make nnimap slower, but it helps with
some servers.")
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(defvoo nnimap-connection-alist nil)
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(defvoo nnimap-current-infos nil)

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(defvoo nnimap-fetch-partial-articles nil
  "If non-nil, Gnus will fetch partial articles.
If t, nnimap will fetch only the first part.  If a string, it
will fetch all parts that have types that match that string.  A
likely value would be \"text/\" to automatically fetch all
textual parts.")

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(defvar nnimap-process nil)

(defvar nnimap-status-string "")
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(defvar nnimap-split-download-body-default nil
  "Internal variable with default value for `nnimap-split-download-body'.")

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(defvar nnimap-keepalive-timer nil)
(defvar nnimap-process-buffers nil)

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(defstruct nnimap
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  group process commands capabilities select-result newlinep server
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  last-command-time greeting)
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(defvar nnimap-object nil)

(defvar nnimap-mark-alist
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  '((read "\\Seen" %Seen)
    (tick "\\Flagged" %Flagged)
    (reply "\\Answered" %Answered)
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    (expire "gnus-expire")
    (dormant "gnus-dormant")
    (score "gnus-score")
    (save "gnus-save")
    (download "gnus-download")
    (forward "gnus-forward")))

(defun nnimap-buffer ()
  (nnimap-find-process-buffer nntp-server-buffer))

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(deffoo nnimap-retrieve-headers (articles &optional group server fetch-old)
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  (with-current-buffer nntp-server-buffer
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    (erase-buffer)
    (when (nnimap-possibly-change-group group server)
      (with-current-buffer (nnimap-buffer)
	(erase-buffer)
	(nnimap-wait-for-response
	 (nnimap-send-command
	  "UID FETCH %s %s"
	  (nnimap-article-ranges (gnus-compress-sequence articles))
	  (format "(UID RFC822.SIZE BODYSTRUCTURE %s)"
		  (format
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		   (if (nnimap-ver4-p)
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		       "BODY.PEEK[HEADER.FIELDS %s]"
		     "RFC822.HEADER.LINES %s")
		   (append '(Subject From Date Message-Id
				     References In-Reply-To Xref)
			   nnmail-extra-headers))))
	 t)
	(nnimap-transform-headers))
      (insert-buffer-substring
       (nnimap-find-process-buffer (current-buffer))))
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    'headers))
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(defun nnimap-transform-headers ()
  (goto-char (point-min))
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  (let (article bytes lines size string)
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    (block nil
      (while (not (eobp))
	(while (not (looking-at "^\\* [0-9]+ FETCH.*UID \\([0-9]+\\)"))
	  (delete-region (point) (progn (forward-line 1) (point)))
	  (when (eobp)
	    (return)))
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	(setq article (match-string 1))
	;; Unfold quoted {number} strings.
	(while (re-search-forward "[^]] {\\([0-9]+\\)}\r\n"
				  (1+ (line-end-position)) t)
	  (setq size (string-to-number (match-string 1)))
	  (delete-region (+ (match-beginning 0) 2) (point))
	  (setq string (delete-region (point) (+ (point) size)))
	  (insert (format "%S" string)))
	(setq bytes (nnimap-get-length)
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	      lines nil)
	(beginning-of-line)
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	(setq size
	      (and (re-search-forward "RFC822.SIZE \\([0-9]+\\)"
				      (line-end-position)
				      t)
		   (match-string 1)))
	(beginning-of-line)
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	(when (search-forward "BODYSTRUCTURE" (line-end-position) t)
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	  (let ((structure (ignore-errors
			     (read (current-buffer)))))
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	    (while (and (consp structure)
			(not (stringp (car structure))))
	      (setq structure (car structure)))
	    (setq lines (nth 7 structure))))
	(delete-region (line-beginning-position) (line-end-position))
	(insert (format "211 %s Article retrieved." article))
	(forward-line 1)
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	(when size
	  (insert (format "Chars: %s\n" size)))
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	(when lines
	  (insert (format "Lines: %s\n" lines)))
	(re-search-forward "^\r$")
	(delete-region (line-beginning-position) (line-end-position))
	(insert ".")
	(forward-line 1)))))

(defun nnimap-get-length ()
  (and (re-search-forward "{\\([0-9]+\\)}" (line-end-position) t)
       (string-to-number (match-string 1))))

(defun nnimap-article-ranges (ranges)
  (let (result)
    (cond
     ((numberp ranges)
      (number-to-string ranges))
     ((numberp (cdr ranges))
      (format "%d:%d" (car ranges) (cdr ranges)))
     (t
      (dolist (elem ranges)
	(push
	 (if (consp elem)
	     (format "%d:%d" (car elem) (cdr elem))
	   (number-to-string elem))
	 result))
      (mapconcat #'identity (nreverse result) ",")))))

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(deffoo nnimap-open-server (server &optional defs)
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  (if (nnimap-server-opened server)
      t
    (unless (assq 'nnimap-address defs)
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      (setq defs (append defs (list (list 'nnimap-address server)))))
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    (nnoo-change-server 'nnimap server defs)
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    (or (nnimap-find-connection nntp-server-buffer)
	(nnimap-open-connection nntp-server-buffer))))

(defun nnimap-make-process-buffer (buffer)
  (with-current-buffer
      (generate-new-buffer (format "*nnimap %s %s %s*"
				   nnimap-address nnimap-server-port
				   (gnus-buffer-exists-p buffer)))
    (mm-disable-multibyte)
    (buffer-disable-undo)
    (gnus-add-buffer)
    (set (make-local-variable 'after-change-functions) nil)
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    (set (make-local-variable 'nnimap-object)
	 (make-nnimap :server (nnoo-current-server 'nnimap)))
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    (push (list buffer (current-buffer)) nnimap-connection-alist)
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    (push (current-buffer) nnimap-process-buffers)
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    (current-buffer)))

(defun nnimap-open-shell-stream (name buffer host port)
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  (let ((process-connection-type nil))
    (start-process name buffer shell-file-name
		   shell-command-switch
		   (format-spec
		    nnimap-shell-program
		    (format-spec-make
		     ?s host
		     ?p port)))))
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(defun nnimap-credentials (address ports &optional inhibit-create)
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  (let (port credentials)
    ;; Request the credentials from all ports, but only query on the
    ;; last port if all the previous ones have failed.
    (while (and (null credentials)
		(setq port (pop ports)))
      (setq credentials
	    (auth-source-user-or-password
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	     '("login" "password") address port nil
	     (if inhibit-create
		 nil
	       (null ports)))))
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    credentials))

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(defun nnimap-keepalive ()
  (let ((now (current-time)))
    (dolist (buffer nnimap-process-buffers)
      (when (buffer-name buffer)
	(with-current-buffer buffer
	  (when (and nnimap-object
		     (nnimap-last-command-time nnimap-object)
		     (> (time-to-seconds
			 (time-subtract
			  now
			  (nnimap-last-command-time nnimap-object)))
			;; More than five minutes since the last command.
			(* 5 60)))
	    (nnimap-send-command "NOOP")))))))

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(defun nnimap-open-connection (buffer)
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  (unless nnimap-keepalive-timer
    (setq nnimap-keepalive-timer (run-at-time (* 60 15) (* 60 15)
					      'nnimap-keepalive)))
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  (block nil
    (with-current-buffer (nnimap-make-process-buffer buffer)
      (let* ((coding-system-for-read 'binary)
	     (coding-system-for-write 'binary)
	     (port nil)
	     (ports
	      (cond
	       ((eq nnimap-stream 'network)
		(open-network-stream
		 "*nnimap*" (current-buffer) nnimap-address
		 (setq port
		       (or nnimap-server-port
			   (if (netrc-find-service-number "imap")
			       "imap"
			     "143"))))
		'("143" "imap"))
	       ((eq nnimap-stream 'shell)
		(nnimap-open-shell-stream
		 "*nnimap*" (current-buffer) nnimap-address
		 (setq port (or nnimap-server-port "imap")))
		'("imap"))
	       ((eq nnimap-stream 'starttls)
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		(let ((tls-program (nnimap-extend-tls-programs)))
		  (open-tls-stream
		   "*nnimap*" (current-buffer) nnimap-address
		   (setq port (or nnimap-server-port "imap"))
		   'starttls))
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		'("imap"))
	       ((eq nnimap-stream 'ssl)
		(open-tls-stream
		 "*nnimap*" (current-buffer) nnimap-address
		 (setq port
		       (or nnimap-server-port
			   (if (netrc-find-service-number "imaps")
			       "imaps"
			     "993"))))
		'("143" "993" "imap" "imaps"))))
	     connection-result login-result credentials)
	(setf (nnimap-process nnimap-object)
	      (get-buffer-process (current-buffer)))
	(if (not (and (nnimap-process nnimap-object)
		      (memq (process-status (nnimap-process nnimap-object))
			    '(open run))))
	    (nnheader-report 'nnimap "Unable to contact %s:%s via %s"
			     nnimap-address port nnimap-stream)
	  (gnus-set-process-query-on-exit-flag (nnimap-process nnimap-object) nil)
	  (if (not (setq connection-result (nnimap-wait-for-connection)))
	      (nnheader-report 'nnimap
			       "%s" (buffer-substring
				     (point) (line-end-position)))
	    ;; Store the greeting (for debugging purposes).
	    (setf (nnimap-greeting nnimap-object)
		  (buffer-substring (line-beginning-position)
				    (line-end-position)))
	    ;; Store the capabilities.
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	    (setf (nnimap-capabilities nnimap-object)
		  (mapcar
		   #'upcase
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		   (nnimap-find-parameter
		    "CAPABILITY" (cdr (nnimap-command "CAPABILITY")))))
	    (when nnimap-server-port
	      (push (format "%s" nnimap-server-port) ports))
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	    ;; If this is a STARTTLS-capable server, then sever the
	    ;; connection and start a STARTTLS connection instead.
	    (when (and (eq nnimap-stream 'network)
		       (member "STARTTLS" (nnimap-capabilities nnimap-object)))
	      (let ((nnimap-stream 'starttls))
		(let ((tls-process
		       (nnimap-open-connection buffer)))
		  ;; If the STARTTLS connection was successful, we
		  ;; kill our first non-encrypted connection.  If it
		  ;; wasn't successful, we just use our unencrypted
		  ;; connection.
		  (when (memq (process-status tls-process) '(open run))
		    (delete-process (nnimap-process nnimap-object))
		    (kill-buffer (current-buffer))
		    (return tls-process)))))
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	    (unless (equal connection-result "PREAUTH")
	      (if (not (setq credentials
			     (if (eq nnimap-authenticator 'anonymous)
				 (list "anonymous"
				       (message-make-address))
			       (or
				;; First look for the credentials based
				;; on the virtual server name.
				(nnimap-credentials
				 (nnoo-current-server 'nnimap) ports t)
				;; Then look them up based on the
				;; physical address.
				(nnimap-credentials nnimap-address ports)))))
		  (setq nnimap-object nil)
		(setq login-result (nnimap-command "LOGIN %S %S"
						   (car credentials)
						   (cadr credentials)))
		(unless (car login-result)
		  ;; If the login failed, then forget the credentials
		  ;; that are now possibly cached.
		  (dolist (host (list (nnoo-current-server 'nnimap)
				      nnimap-address))
		    (dolist (port ports)
		      (dolist (element '("login" "password"))
			(auth-source-forget-user-or-password
			 element host port))))
		  (delete-process (nnimap-process nnimap-object))
		  (setq nnimap-object nil))))
	    (when nnimap-object
	      (when (member "QRESYNC" (nnimap-capabilities nnimap-object))
		(nnimap-command "ENABLE QRESYNC"))
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	      (nnimap-process nnimap-object))))))))

(defun nnimap-extend-tls-programs ()
  (let ((programs tls-program)
	result)
    (unless (consp programs)
      (setq programs (list programs)))
    (dolist (program programs)
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      (when (assoc (car (split-string program)) tls-starttls-switches)
	(push (if (not (string-match "%s" program))
		  (concat program " " "%s")
		program)
	      result)))
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    (nreverse result)))
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(defun nnimap-find-parameter (parameter elems)
  (let (result)
    (dolist (elem elems)
      (cond
       ((equal (car elem) parameter)
	(setq result (cdr elem)))
       ((and (equal (car elem) "OK")
	     (consp (cadr elem))
	     (equal (caadr elem) parameter))
	(setq result (cdr (cadr elem))))))
    result))

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(deffoo nnimap-close-server (&optional server)
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  t)

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(deffoo nnimap-request-close ()
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  t)
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(deffoo nnimap-server-opened (&optional server)
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  (and (nnoo-current-server-p 'nnimap server)
       nntp-server-buffer
       (gnus-buffer-live-p nntp-server-buffer)
       (nnimap-find-connection nntp-server-buffer)))
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(deffoo nnimap-status-message (&optional server)
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  nnimap-status-string)
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(deffoo nnimap-request-article (article &optional group server to-buffer)
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  (with-current-buffer nntp-server-buffer
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    (let ((result (nnimap-possibly-change-group group server))
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	  parts structure)
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      (when (stringp article)
	(setq article (nnimap-find-article-by-message-id group article)))
      (when (and result
		 article)
	(erase-buffer)
	(with-current-buffer (nnimap-buffer)
	  (erase-buffer)
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	  (when nnimap-fetch-partial-articles
	    (nnimap-command "UID FETCH %d (BODYSTRUCTURE)" article)
	    (goto-char (point-min))
	    (when (re-search-forward "FETCH.*BODYSTRUCTURE" nil t)
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	      (setq structure (ignore-errors
				(let ((start (point)))
				  (forward-sexp 1)
				  (downcase-region start (point))
				  (goto-char (point))
				  (read (current-buffer))))
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		    parts (nnimap-find-wanted-parts structure))))
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	  (when (if parts
		    (nnimap-get-partial-article article parts structure)
		  (nnimap-get-whole-article article))
	    (let ((buffer (current-buffer)))
	      (with-current-buffer (or to-buffer nntp-server-buffer)
		(erase-buffer)
		(insert-buffer-substring buffer)
		(nnheader-ms-strip-cr)
		(cons group article)))))))))

(defun nnimap-get-whole-article (article)
  (let ((result
	 (nnimap-command
	  (if (nnimap-ver4-p)
	      "UID FETCH %d BODY.PEEK[]"
	    "UID FETCH %d RFC822.PEEK")
	  article)))
    ;; Check that we really got an article.
    (goto-char (point-min))
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    (unless (re-search-forward "\\* [0-9]+ FETCH" nil t)
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      (setq result nil))
    (when result
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      ;; Remove any data that may have arrived before the FETCH data.
      (beginning-of-line)
      (unless (bobp)
	(delete-region (point-min) (point)))
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      (let ((bytes (nnimap-get-length)))
	(delete-region (line-beginning-position)
		       (progn (forward-line 1) (point)))
	(goto-char (+ (point) bytes))
	(delete-region (point) (point-max)))
      t)))

(defun nnimap-ver4-p ()
  (member "IMAP4REV1" (nnimap-capabilities nnimap-object)))

(defun nnimap-get-partial-article (article parts structure)
  (let ((result
	 (nnimap-command
	  "UID FETCH %d (%s %s)"
	  article
	  (if (nnimap-ver4-p)
	      "BODY.PEEK[HEADER]"
	    "RFC822.HEADER")
	  (if (nnimap-ver4-p)
	      (mapconcat (lambda (part)
			   (format "BODY.PEEK[%s]" part))
			 parts " ")
	    (mapconcat (lambda (part)
			 (format "RFC822.PEEK[%s]" part))
		       parts " ")))))
    (when result
      (nnimap-convert-partial-article structure))))

(defun nnimap-convert-partial-article (structure)
  ;; First just skip past the headers.
  (goto-char (point-min))
  (let ((bytes (nnimap-get-length))
	id parts)
    ;; Delete "FETCH" line.
    (delete-region (line-beginning-position)
		   (progn (forward-line 1) (point)))
    (goto-char (+ (point) bytes))
    ;; Collect all the body parts.
    (while (looking-at ".*BODY\\[\\([.0-9]+\\)\\]")
      (setq id (match-string 1)
	    bytes (nnimap-get-length))
      (beginning-of-line)
      (delete-region (point) (progn (forward-line 1) (point)))
      (push (list id (buffer-substring (point) (+ (point) bytes)))
	    parts)
      (delete-region (point) (+ (point) bytes)))
    ;; Delete trailing junk.
    (delete-region (point) (point-max))
    ;; Now insert all the parts again where they fit in the structure.
    (nnimap-insert-partial-structure structure parts)
    t))

(defun nnimap-insert-partial-structure (structure parts &optional subp)
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  (let (type boundary)
    (let ((bstruc structure))
      (while (consp (car bstruc))
	(pop bstruc))
      (setq type (car bstruc))
      (setq bstruc (car (cdr bstruc)))
      (when (and (stringp (car bstruc))
		 (string= (downcase (car bstruc)) "boundary"))
	(setq boundary (cadr bstruc))))
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    (when subp
      (insert (format "Content-type: multipart/%s; boundary=%S\n\n"
		      (downcase type) boundary)))
    (while (not (stringp (car structure)))
      (insert "\n--" boundary "\n")
      (if (consp (caar structure))
	  (nnimap-insert-partial-structure (pop structure) parts t)
	(let ((bit (pop structure)))
	  (insert (format  "Content-type: %s/%s"
			   (downcase (nth 0 bit))
			   (downcase (nth 1 bit))))
	  (if (member "CHARSET" (nth 2 bit))
	      (insert (format
		       "; charset=%S\n" (cadr (member "CHARSET" (nth 2 bit)))))
	    (insert "\n"))
	  (insert (format "Content-transfer-encoding: %s\n"
			  (nth 5 bit)))
	  (insert "\n")
	  (when (assoc (nth 9 bit) parts)
	    (insert (cadr (assoc (nth 9 bit) parts)))))))
    (insert "\n--" boundary "--\n")))
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(defun nnimap-find-wanted-parts (structure)
  (message-flatten-list (nnimap-find-wanted-parts-1 structure "")))

(defun nnimap-find-wanted-parts-1 (structure prefix)
  (let ((num 1)
	parts)
    (while (consp (car structure))
      (let ((sub (pop structure)))
	(if (consp (car sub))
	    (push (nnimap-find-wanted-parts-1
		   sub (if (string= prefix "")
			   (number-to-string num)
			 (format "%s.%s" prefix num)))
		  parts)
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	  (let ((type (format "%s/%s" (nth 0 sub) (nth 1 sub)))
		(id (if (string= prefix "")
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			(number-to-string num)
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		      (format "%s.%s" prefix num))))
	    (setcar (nthcdr 9 sub) id)
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	    (when (if (eq nnimap-fetch-partial-articles t)
		      (equal id "1")
		    (string-match nnimap-fetch-partial-articles type))
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	      (push id parts))))
	(incf num)))
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    (nreverse parts)))
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(deffoo nnimap-request-group (group &optional server dont-check info)
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  (let ((result (nnimap-possibly-change-group group server))
	articles active marks high low)
    (with-current-buffer nntp-server-buffer
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      (when result
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	(if (and dont-check
		 (setq active (nth 2 (assoc group nnimap-current-infos))))
	    (insert (format "211 %d %d %d %S\n"
			    (- (cdr active) (car active))
			    (car active)
			    (cdr active)
			    group))
	  (with-current-buffer (nnimap-buffer)
	    (erase-buffer)
	    (let ((group-sequence
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		   (nnimap-send-command "SELECT %S" (utf7-encode group t)))
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		  (flag-sequence
		   (nnimap-send-command "UID FETCH 1:* FLAGS")))
	      (nnimap-wait-for-response flag-sequence)
	      (setq marks
		    (nnimap-flags-to-marks
		     (nnimap-parse-flags
		      (list (list group-sequence flag-sequence 1 group)))))
	      (when info
		(nnimap-update-infos marks (list info)))
	      (goto-char (point-max))
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	      (let ((uidnext (nth 5 (car marks))))
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		(setq high (or (if uidnext
                                   (1- uidnext)
                                 (nth 3 (car marks)))
                               0)
		      low (or (nth 4 (car marks)) uidnext 1)))))
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	  (erase-buffer)
	  (insert
	   (format
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	    "211 %d %d %d %S\n" (1+ (- high low)) low high group)))
	t))))

(deffoo nnimap-request-create-group (group &optional server args)
  (when (nnimap-possibly-change-group nil server)
    (with-current-buffer (nnimap-buffer)
      (car (nnimap-command "CREATE %S" (utf7-encode group t))))))
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(deffoo nnimap-request-delete-group (group &optional force server)
  (when (nnimap-possibly-change-group nil server)
    (with-current-buffer (nnimap-buffer)
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      (car (nnimap-command "DELETE %S" (utf7-encode group t))))))

(deffoo nnimap-request-expunge-group (group &optional server)
  (when (nnimap-possibly-change-group group server)
    (with-current-buffer (nnimap-buffer)
      (car (nnimap-command "EXPUNGE")))))
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(defun nnimap-get-flags (spec)
  (let ((articles nil)
	elems)
    (with-current-buffer (nnimap-buffer)
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      (erase-buffer)
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      (nnimap-wait-for-response (nnimap-send-command
				 "UID FETCH %s FLAGS" spec))
      (goto-char (point-min))
      (while (re-search-forward "^\\* [0-9]+ FETCH (\\(.*\\))" nil t)
	(setq elems (nnimap-parse-line (match-string 1)))
	(push (cons (string-to-number (cadr (member "UID" elems)))
		    (cadr (member "FLAGS" elems)))
	      articles)))
    (nreverse articles)))
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(deffoo nnimap-close-group (group &optional server)
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  t)
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(deffoo nnimap-request-move-article (article group server accept-form
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					     &optional last internal-move-group)
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  (with-temp-buffer
    (when (nnimap-request-article article group server (current-buffer))
      ;; If the move is internal (on the same server), just do it the easy
      ;; way.
      (let ((message-id (message-field-value "message-id")))
	(if internal-move-group
	    (let ((result
		   (with-current-buffer (nnimap-buffer)
		     (nnimap-command "UID COPY %d %S"
				     article
				     (utf7-encode internal-move-group t)))))
	      (when (car result)
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		(nnimap-delete-article article)
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		(cons internal-move-group
		      (nnimap-find-article-by-message-id
		       internal-move-group message-id))))
	  ;; Move the article to a different method.
	  (let ((result (eval accept-form)))
	    (when result
	      (nnimap-delete-article article)
	      result)))))))
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(deffoo nnimap-request-expire-articles (articles group &optional server force)
  (cond
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   ((null articles)
    nil)
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   ((not (nnimap-possibly-change-group group server))
    articles)
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   ((and force
	 (eq nnmail-expiry-target 'delete))
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    (unless (nnimap-delete-article (gnus-compress-sequence articles))
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      (message "Article marked for deletion, but not expunged."))
    nil)
   (t
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    (let ((deletable-articles
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	   (if (or force
		   (eq nnmail-expiry-wait 'immediate))
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	       articles
	     (gnus-sorted-intersection
	      articles
	      (nnimap-find-expired-articles group)))))
      (if (null deletable-articles)
	  articles
	(if (eq nnmail-expiry-target 'delete)
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	    (nnimap-delete-article (gnus-compress-sequence deletable-articles))
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	  (setq deletable-articles
		(nnimap-process-expiry-targets
		 deletable-articles group server)))
	;; Return the articles we didn't delete.
	(gnus-sorted-complement articles deletable-articles))))))

(defun nnimap-process-expiry-targets (articles group server)
  (let ((deleted-articles nil))
    (dolist (article articles)
      (let ((target nnmail-expiry-target))
	(with-temp-buffer
	  (when (nnimap-request-article article group server (current-buffer))
	    (message "Expiring article %s:%d" group article)
	    (when (functionp target)
	      (setq target (funcall target group)))
	    (when (and target
		       (not (eq target 'delete)))
	      (if (or (gnus-request-group target t)
		      (gnus-request-create-group target))
		  (nnmail-expiry-target-group target group)
		(setq target nil)))
	    (when target
	      (push article deleted-articles))))))
    ;; Change back to the current group again.
    (nnimap-possibly-change-group group server)
    (setq deleted-articles (nreverse deleted-articles))
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    (nnimap-delete-article (gnus-compress-sequence deleted-articles))
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    deleted-articles))

(defun nnimap-find-expired-articles (group)
  (let ((cutoff (nnmail-expired-article-p group nil nil)))
    (with-current-buffer (nnimap-buffer)
      (let ((result
	     (nnimap-command
	      "UID SEARCH SENTBEFORE %s"
	      (format-time-string
	       (format "%%d-%s-%%Y"
		       (upcase
			(car (rassoc (nth 4 (decode-time cutoff))
				     parse-time-months))))
	       cutoff))))
	(and (car result)
	     (delete 0 (mapcar #'string-to-number
			       (cdr (assoc "SEARCH" (cdr result))))))))))

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(defun nnimap-find-article-by-message-id (group message-id)
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  (with-current-buffer (nnimap-buffer)
    (erase-buffer)
    (setf (nnimap-group nnimap-object) nil)
    (nnimap-send-command "EXAMINE %S" (utf7-encode group t))
    (let ((sequence
	   (nnimap-send-command "UID SEARCH HEADER Message-Id %S" message-id))
	  article result)
      (setq result (nnimap-wait-for-response sequence))
      (when (and result
		 (car (setq result (nnimap-parse-response))))
	;; Select the last instance of the message in the group.
	(and (setq article
		   (car (last (assoc "SEARCH" (cdr result)))))
	     (string-to-number article))))))
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(defun nnimap-delete-article (articles)
  (with-current-buffer (nnimap-buffer)
    (nnimap-command "UID STORE %s +FLAGS.SILENT (\\Deleted)"
		    (nnimap-article-ranges articles))
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    (cond
     ((member "UIDPLUS" (nnimap-capabilities nnimap-object))
      (nnimap-command "UID EXPUNGE %s"
		      (nnimap-article-ranges articles))
      t)
     (nnimap-expunge
      (nnimap-command "EXPUNGE")
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      t)
     (t (gnus-message 7 (concat "nnimap: nnimap-expunge is not set and the "
                                "server doesn't support UIDPLUS, so we won't "
                                "delete this article now"))))))
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(deffoo nnimap-request-scan (&optional group server)
  (when (and (nnimap-possibly-change-group nil server)
	     nnimap-inbox
	     nnimap-split-methods)
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    (message "nnimap %s splitting mail..." server)
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    (nnimap-split-incoming-mail)))

(defun nnimap-marks-to-flags (marks)
  (let (flags flag)
    (dolist (mark marks)
      (when (setq flag (cadr (assq mark nnimap-mark-alist)))
	(push flag flags)))
    flags))

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(deffoo nnimap-request-set-mark (group actions &optional server)
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  (when (nnimap-possibly-change-group group server)
    (let (sequence)
      (with-current-buffer (nnimap-buffer)
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	(erase-buffer)
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	;; Just send all the STORE commands without waiting for
	;; response.  If they're successful, they're successful.
	(dolist (action actions)
	  (destructuring-bind (range action marks) action
	    (let ((flags (nnimap-marks-to-flags marks)))
	      (when flags
		(setq sequence (nnimap-send-command
				"UID STORE %s %sFLAGS.SILENT (%s)"
				(nnimap-article-ranges range)
				(if (eq action 'del)
				    "-"
				  "+")
				(mapconcat #'identity flags " ")))))))
	;; Wait for the last command to complete to avoid later
	;; syncronisation problems with the stream.
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	(when sequence
	  (nnimap-wait-for-response sequence))))))
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(deffoo nnimap-request-accept-article (group &optional server last)
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  (when (nnimap-possibly-change-group nil server)
    (nnmail-check-syntax)
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    (let ((message-id (message-field-value "message-id"))
	  sequence message)
      (nnimap-add-cr)
      (setq message (buffer-string))
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      (with-current-buffer (nnimap-buffer)
	(setq sequence (nnimap-send-command
			"APPEND %S {%d}" (utf7-encode group t)
			(length message)))
	(process-send-string (get-buffer-process (current-buffer)) message)
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	(process-send-string (get-buffer-process (current-buffer))
			     (if (nnimap-newlinep nnimap-object)
				 "\n"
			       "\r\n"))
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	(let ((result (nnimap-get-response sequence)))
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	  (if (not (car result))
	      (progn
		(message "%s" (nnheader-get-report-string 'nnimap))
		nil)
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	    (cons group
		  (nnimap-find-article-by-message-id group message-id))))))))

(defun nnimap-add-cr ()
  (goto-char (point-min))
  (while (re-search-forward "\r?\n" nil t)
    (replace-match "\r\n" t t)))

(defun nnimap-get-groups ()
  (let ((result (nnimap-command "LIST \"\" \"*\""))
	groups)
    (when (car result)
      (dolist (line (cdr result))
	(when (and (equal (car line) "LIST")
		   (not (and (caadr line)
			     (string-match "noselect" (caadr line)))))
	  (push (car (last line)) groups)))
      (nreverse groups))))

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(deffoo nnimap-request-list (&optional server)
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  (nnimap-possibly-change-group nil server)
  (with-current-buffer nntp-server-buffer
    (erase-buffer)
    (let ((groups
	   (with-current-buffer (nnimap-buffer)
	     (nnimap-get-groups)))
	  sequences responses)
      (when groups
	(with-current-buffer (nnimap-buffer)
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	  (setf (nnimap-group nnimap-object) nil)
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	  (dolist (group groups)
	    (push (list (nnimap-send-command "EXAMINE %S" (utf7-encode group t))
			group)
		  sequences))
	  (nnimap-wait-for-response (caar sequences))
	  (setq responses
		(nnimap-get-responses (mapcar #'car sequences))))
	(dolist (response responses)
	  (let* ((sequence (car response))
		 (response (cadr response))
		 (group (cadr (assoc sequence sequences))))
	    (when (and group
		       (equal (caar response) "OK"))
	      (let ((uidnext (nnimap-find-parameter "UIDNEXT" response))
		    highest exists)
		(dolist (elem response)
		  (when (equal (cadr elem) "EXISTS")
		    (setq exists (string-to-number (car elem)))))
		(when uidnext
		  (setq highest (1- (string-to-number (car uidnext)))))
		(cond
		 ((null highest)
		  (insert (format "%S 0 1 y\n" (utf7-decode group t))))
		 ((zerop exists)
		  ;; Empty group.
		  (insert (format "%S %d %d y\n"
				  (utf7-decode group t) highest (1+ highest))))
		 (t
		  ;; Return the widest possible range.
		  (insert (format "%S %d 1 y\n" (utf7-decode group t)
				  (or highest exists)))))))))
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	t))))

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(deffoo nnimap-request-newgroups (date &optional server)
  (nnimap-possibly-change-group nil server)
  (with-current-buffer nntp-server-buffer
    (erase-buffer)
    (dolist (group (with-current-buffer (nnimap-buffer)
		     (nnimap-get-groups)))
      (unless (assoc group nnimap-current-infos)
	;; Insert dummy numbers here -- they don't matter.
	(insert (format "%S 0 1 y\n" group))))))

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(deffoo nnimap-retrieve-group-data-early (server infos)
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  (when (nnimap-possibly-change-group nil server)
    (with-current-buffer (nnimap-buffer)
      ;; QRESYNC handling isn't implemented.
      (let ((qresyncp (member "notQRESYNC" (nnimap-capabilities nnimap-object)))
	    marks groups sequences)
	;; Go through the infos and gather the data needed to know
	;; what and how to request the data.
	(dolist (info infos)
	  (setq marks (gnus-info-marks info))
	  (push (list (gnus-group-real-name (gnus-info-group info))
		      (cdr (assq 'active marks))
		      (cdr (assq 'uid marks)))
		groups))
	;; Then request the data.
	(erase-buffer)
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	(setf (nnimap-group nnimap-object) nil)
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	(dolist (elem groups)
	  (if (and qresyncp
		   (nth 2 elem))
	      (push
	       (list 'qresync
		     (nnimap-send-command "EXAMINE %S (QRESYNC (%s %s))"
					  (car elem)
					  (car (nth 2 elem))
					  (cdr (nth 2 elem)))
		     nil
		     (car elem))
	       sequences)
	    (let ((start
		   (if (nth 1 elem)
		       ;; Fetch the last 100 flags.
		       (max 1 (- (cdr (nth 1 elem)) 100))
		     1)))
	      (push (list (nnimap-send-command "EXAMINE %S" (car elem))
			  (nnimap-send-command "UID FETCH %d:* FLAGS" start)
			  start
			  (car elem))
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		    sequences)))
	  ;; Some servers apparently can't have many outstanding
	  ;; commands, so throttle them.
	  (when (and (not nnimap-streaming)
		     (car sequences))
	    (nnimap-wait-for-response (caar sequences))))
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	sequences))))

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(deffoo nnimap-finish-retrieve-group-infos (server infos sequences)
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  (when (and sequences
	     (nnimap-possibly-change-group nil server))
    (with-current-buffer (nnimap-buffer)
      ;; Wait for the final data to trickle in.
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      (when (nnimap-wait-for-response (cadar sequences))
	;; Now we should have all the data we need, no matter whether
	;; we're QRESYNCING, fetching all the flags from scratch, or
	;; just fetching the last 100 flags per group.
	(nnimap-update-infos (nnimap-flags-to-marks
			      (nnimap-parse-flags
			       (nreverse sequences)))
			     infos)
	;; Finally, just return something resembling an active file in
	;; the nntp buffer, so that the agent can save the info, too.
	(with-current-buffer nntp-server-buffer
	  (erase-buffer)
	  (dolist (info infos)
	    (let* ((group (gnus-info-group info))
		   (active (gnus-active group)))
	      (when active
		(insert (format "%S %d %d y\n"
				(gnus-group-real-name group)
				(cdr active)
				(car active)))))))))))
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(defun nnimap-update-infos (flags infos)
  (dolist (info infos)
    (let ((group (gnus-group-real-name (gnus-info-group info))))
      (nnimap-update-info info (cdr (assoc group flags))))))

(defun nnimap-update-info (info marks)
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  (when (and marks
	     ;; Ignore groups with no UIDNEXT values.
	     (nth 4 marks))
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    (destructuring-bind (existing flags high low uidnext start-article
				  permanent-flags) marks
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      (let ((group (gnus-info-group info))
	    (completep (and start-article
			    (= start-article 1))))
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	(when uidnext
	  (setq high (1- uidnext)))
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	;; First set the active ranges based on high/low.
	(if (or completep
		(not (gnus-active group)))
	    (gnus-set-active group
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			     (cond
			      ((and low high)
			       (cons low high))
			      (uidnext
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			       ;; No articles in this group.
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			       (cons uidnext (1- uidnext)))
			      (start-article
			       (cons start-article (1- start-article)))
			      (t
			       ;; No articles and no uidnext.
			       nil)))
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	  (gnus-set-active
	   group
	   (cons (car (gnus-active group))
		 (or high (1- uidnext)))))
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	(when (and (not high)
		   uidnext)
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	  (setq high (1- uidnext)))
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	;; Then update the list of read articles.
	(let* ((unread
		(gnus-compress-sequence
		 (gnus-set-difference
		  (gnus-set-difference
		   existing
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		   (cdr (assoc '%Seen flags)))
		  (cdr (assoc '%Flagged flags)))))
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	       (read (gnus-range-difference
		      (cons start-article high) unread)))
	  (when (> start-article 1)
	    (setq read
		  (gnus-range-nconcat
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		   (if (> start-article 1)
		       (gnus-sorted-range-intersection
			(cons 1 (1- start-article))
			(gnus-info-read info))
		     (gnus-info-read info))
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		   read)))
	  (gnus-info-set-read info read)
	  ;; Update the marks.
	  (setq marks (gnus-info-marks info))
	  ;; Note the active level for the next run-through.
	  (let ((active (assq 'active marks)))
	    (if active
		(setcdr active (gnus-active group))
	      (push (cons 'active (gnus-active group)) marks)))
	  (dolist (type (cdr nnimap-mark-alist))
	    (let ((old-marks (assoc (car type) marks))
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		  (new-marks
		   (gnus-compress-sequence
		    (cdr (or (assoc (caddr type) flags)	    ; %Flagged
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			     (assoc (intern (cadr type) obarray) flags)
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			     (assoc (cadr type) flags)))))) ; "\Flagged"
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	      (setq marks (delq old-marks marks))
	      (pop old-marks)
	      (when (and old-marks
			 (> start-article 1))
		(setq old-marks (gnus-range-difference
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				 old-marks
				 (cons start-article high)))
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		(setq new-marks (gnus-range-nconcat old-marks new-marks)))
	      (when new-marks
		(push (cons (car type) new-marks) marks)))
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	    (gnus-info-set-marks info marks t)
	    (nnimap-store-info info (gnus-active group))))))))

(defun nnimap-store-info (info active)
  (let* ((group (gnus-group-real-name (gnus-info-group info)))
	 (entry (assoc group nnimap-current-infos)))
    (if entry
	(setcdr entry (list info active))
      (push (list group info active) nnimap-current-infos))))
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(defun nnimap-flags-to-marks (groups)
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  (let (data group totalp uidnext articles start-article mark permanent-flags)
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    (dolist (elem groups)
      (setq group (car elem)
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	    uidnext (nth 1 elem)
	    start-article (nth 2 elem)
	    permanent-flags (nth 3 elem)
	    articles (nthcdr 4 elem))
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      (let ((high (caar articles))
	    marks low existing)
	(dolist (article articles)
	  (setq low (car article))
	  (push (car article) existing)
	  (dolist (flag (cdr article))
	    (setq mark (assoc flag marks))
	    (if (not mark)
		(push (list flag (car article)) marks)
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	      (setcdr mark (cons (car article) (cdr mark))))))
	(push (list group existing marks high low uidnext start-article
		    permanent-flags)
	      data)))
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    data))

(defun nnimap-parse-flags (sequences)
  (goto-char (point-min))
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  ;; Change \Delete etc to %Delete, so that the reader can read it.
  (subst-char-in-region (point-min) (point-max)
			?\\ ?% t)
  (let (start end articles groups uidnext elems permanent-flags)
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    (dolist (elem sequences)
      (destructuring-bind (group-sequence flag-sequence totalp group) elem
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	(setq start (point))
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	;; The EXAMINE was successful.
	(when (and (search-forward (format "\n%d OK " group-sequence) nil t)
		   (progn
		     (forward-line 1)
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		     (setq end (point))
		     (goto-char start)
		     (setq permanent-flags
			   (and (search-forward "PERMANENTFLAGS "
						 (or end (point-min)) t)
				(read (current-buffer))))
		     (goto-char start)
		     (setq uidnext
			   (and (search-forward "UIDNEXT "
						 (or end (point-min)) t)
				(read (current-buffer))))
		     (goto-char end)
		     (forward-line -1))
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		   ;; The UID FETCH FLAGS was successful.
		   (search-forward (format "\n%d OK " flag-sequence) nil t))
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	  (setq start (point))
	  (goto-char end)
	  (while (search-forward " FETCH " start t)
	    (setq elems (read (current-buffer)))
	    (push (cons (cadr (memq 'UID elems))
			(cadr (memq 'FLAGS elems)))
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		  articles))
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	  (push (nconc (list group uidnext totalp permanent-flags) articles)
		groups)
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	  (setq articles nil))))
    groups))

(defun nnimap-find-process-buffer (buffer)
  (cadr (assoc buffer nnimap-connection-alist)))

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(deffoo nnimap-request-post (&optional server)
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  (setq nnimap-status-string "Read-only server")
  nil)
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(defun nnimap-possibly-change-group (group server)
  (let ((open-result t))
    (when (and server
	       (not (nnimap-server-opened server)))
      (setq open-result (nnimap-open-server server)))
    (cond
     ((not open-result)
      nil)
     ((not group)
      t)
     (t
      (with-current-buffer (nnimap-buffer)
	(if (equal group (nnimap-group nnimap-object))
	    t
	  (let ((result (nnimap-command "SELECT %S" (utf7-encode group t))))
	    (when (car result)
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	      (setf (nnimap-group nnimap-object) group
		    (nnimap-select-result nnimap-object) result)
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	      result))))))))

(defun nnimap-find-connection (buffer)
  "Find the connection delivering to BUFFER."
  (let ((entry (assoc buffer nnimap-connection-alist)))
    (when entry
      (if (and (buffer-name (cadr entry))
	       (get-buffer-process (cadr entry))
	       (memq (process-status (get-buffer-process (cadr entry)))
		     '(open run)))
	  (get-buffer-process (cadr entry))
	(setq nnimap-connection-alist (delq entry nnimap-connection-alist))
	nil))))

(defvar nnimap-sequence 0)

(defun nnimap-send-command (&rest args)
  (process-send-string
   (get-buffer-process (current-buffer))
   (nnimap-log-command
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    (format "%d %s%s\n"
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	    (incf nnimap-sequence)
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	    (apply #'format args)
	    (if (nnimap-newlinep nnimap-object)
		""
	      "\r"))))
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  nnimap-sequence)

(defun nnimap-log-command (command)
  (with-current-buffer (get-buffer-create "*imap log*")
    (goto-char (point-max))
    (insert (format-time-string "%H:%M:%S") " " command))
  command)

(defun nnimap-command (&rest args)
  (erase-buffer)
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  (setf (nnimap-last-command-time nnimap-object) (current-time))
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  (let* ((sequence (apply #'nnimap-send-command args))
	 (response (nnimap-get-response sequence)))
    (if (equal (caar response) "OK")
	(cons t response)
      (nnheader-report 'nnimap "%s"
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		       (mapconcat (lambda (a)
				    (format "%s" a))
				  (car response) " "))
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