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;;; sieve-manage.el --- Implementation of the managesive protocol in elisp
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;; Copyright (C) 2001, 2002, 2003, 2004, 2005, 2006, 2007,
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;;   2008, 2009  Free Software Foundation, Inc.
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;; Author: Simon Josefsson <simon@josefsson.org>

;; 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:

;; This library provides an elisp API for the managesieve network
;; protocol.
;;
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;; It uses the SASL library for authentication, which means it
;; supports DIGEST-MD5, CRAM-MD5, SCRAM-MD5, NTLM, PLAIN and LOGIN
;; methods.  STARTTLS is not well tested, but should be easy to get to
;; work if someone wants.
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;;
;; The API should be fairly obvious for anyone familiar with the
;; managesieve protocol, interface functions include:
;;
;; `sieve-manage-open'
;; open connection to managesieve server, returning a buffer to be
;; used by all other API functions.
;;
;; `sieve-manage-opened'
;; check if a server is open or not
;;
;; `sieve-manage-close'
;; close a server connection.
;;
;; `sieve-manage-authenticate'
;; `sieve-manage-listscripts'
;; `sieve-manage-deletescript'
;; `sieve-manage-getscript'
;; performs managesieve protocol actions
;;
;; and that's it.  Example of a managesieve session in *scratch*:
;;
;; (setq my-buf (sieve-manage-open "my.server.com"))
;; " *sieve* my.server.com:2000*"
;;
;; (sieve-manage-authenticate "myusername" "mypassword" my-buf)
;; 'auth
;;
;; (sieve-manage-listscripts my-buf)
;; ("vacation" "testscript" ("splitmail") "badscript")
;;
;; References:
;;
;; draft-martin-managesieve-02.txt,
;; "A Protocol for Remotely Managing Sieve Scripts",
;; by Tim Martin.
;;
;; Release history:
;;
;; 2001-10-31 Committed to Oort Gnus.
;; 2002-07-27 Added DELETESCRIPT.  Suggested by Ned Ludd.
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;; 2002-08-03 Use SASL library.
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;;; Code:

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;; For Emacs < 22.2.
(eval-and-compile
  (unless (fboundp 'declare-function) (defmacro declare-function (&rest r))))
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(if (locate-library "password-cache")
    (require 'password-cache)
  (require 'password))

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(eval-when-compile
  (require 'sasl)
  (require 'starttls))
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(autoload 'sasl-find-mechanism "sasl")
(autoload 'starttls-open-stream "starttls")
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;; User customizable variables:

(defgroup sieve-manage nil
  "Low-level Managesieve protocol issues."
  :group 'mail
  :prefix "sieve-")

(defcustom sieve-manage-log "*sieve-manage-log*"
  "Name of buffer for managesieve session trace."
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  :type 'string
  :group 'sieve-manage)
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(defcustom sieve-manage-default-user (user-login-name)
  "Default username to use."
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  :type 'string
  :group 'sieve-manage)
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(defcustom sieve-manage-server-eol "\r\n"
  "The EOL string sent from the server."
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  :type 'string
  :group 'sieve-manage)
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(defcustom sieve-manage-client-eol "\r\n"
  "The EOL string we send to the server."
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  :type 'string
  :group 'sieve-manage)
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(defcustom sieve-manage-streams '(network starttls shell)
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  "Priority of streams to consider when opening connection to server."
  :group 'sieve-manage)
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(defcustom sieve-manage-stream-alist
  '((network   sieve-manage-network-p          sieve-manage-network-open)
    (shell     sieve-manage-shell-p            sieve-manage-shell-open)
    (starttls  sieve-manage-starttls-p         sieve-manage-starttls-open))
  "Definition of network streams.

\(NAME CHECK OPEN)

NAME names the stream, CHECK is a function returning non-nil if the
server support the stream and OPEN is a function for opening the
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stream."
  :group 'sieve-manage)
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(defcustom sieve-manage-authenticators '(digest-md5
					 cram-md5
					 scram-md5
					 ntlm
					 plain
					 login)
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  "Priority of authenticators to consider when authenticating to server."
  :group 'sieve-manage)
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(defcustom sieve-manage-authenticator-alist
  '((cram-md5   sieve-manage-cram-md5-p       sieve-manage-cram-md5-auth)
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    (digest-md5 sieve-manage-digest-md5-p     sieve-manage-digest-md5-auth)
    (scram-md5  sieve-manage-scram-md5-p      sieve-manage-scram-md5-auth)
    (ntlm       sieve-manage-ntlm-p           sieve-manage-ntlm-auth)
    (plain      sieve-manage-plain-p          sieve-manage-plain-auth)
    (login      sieve-manage-login-p          sieve-manage-login-auth))
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  "Definition of authenticators.

\(NAME CHECK AUTHENTICATE)

NAME names the authenticator.  CHECK is a function returning non-nil if
the server support the authenticator and AUTHENTICATE is a function
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for doing the actual authentication."
  :group 'sieve-manage)
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(defcustom sieve-manage-default-port 2000
  "Default port number for managesieve protocol."
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  :type 'integer
  :group 'sieve-manage)
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;; Internal variables:

(defconst sieve-manage-local-variables '(sieve-manage-server
					 sieve-manage-port
					 sieve-manage-auth
					 sieve-manage-stream
					 sieve-manage-username
					 sieve-manage-password
					 sieve-manage-process
					 sieve-manage-client-eol
					 sieve-manage-server-eol
					 sieve-manage-capability))
(defconst sieve-manage-default-stream 'network)
(defconst sieve-manage-coding-system-for-read 'binary)
(defconst sieve-manage-coding-system-for-write 'binary)
(defvar sieve-manage-stream nil)
(defvar sieve-manage-auth nil)
(defvar sieve-manage-server nil)
(defvar sieve-manage-port nil)
(defvar sieve-manage-username nil)
(defvar sieve-manage-password nil)
(defvar sieve-manage-state 'closed
  "Managesieve state.
Valid states are `closed', `initial', `nonauth', and `auth'.")
(defvar sieve-manage-process nil)
(defvar sieve-manage-capability nil)

;; Internal utility functions

(defsubst sieve-manage-disable-multibyte ()
  "Enable multibyte in the current buffer."
  (when (fboundp 'set-buffer-multibyte)
    (set-buffer-multibyte nil)))

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(declare-function password-read         "password-cache" (prompt &optional key))
(declare-function password-cache-add    "password-cache" (key password))
(declare-function password-cache-remove "password-cache" (key))

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;; Uses the dynamically bound `reason' variable.
(defvar reason)
(defun sieve-manage-interactive-login (buffer loginfunc)
  "Login to server in BUFFER.
LOGINFUNC is passed a username and a password, it should return t if
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it was successful authenticating itself to the server, nil otherwise.
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Returns t if login was successful, nil otherwise."
  (with-current-buffer buffer
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    (make-local-variable 'sieve-manage-username)
    (make-local-variable 'sieve-manage-password)
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    (let (user passwd ret reason passwd-key)
      (condition-case ()
	  (while (or (not user) (not passwd))
	    (setq user (or sieve-manage-username
			   (read-from-minibuffer
			    (concat "Managesieve username for "
				    sieve-manage-server ": ")
			    (or user sieve-manage-default-user)))
		  passwd-key (concat "managesieve:" user "@" sieve-manage-server
				     ":" sieve-manage-port)
		  passwd (or sieve-manage-password
			     (password-read (concat "Managesieve password for "
						    user "@" sieve-manage-server
						    ": ")
					    passwd-key)))
	    (when (y-or-n-p "Store password for this session? ")
	      (password-cache-add passwd-key (copy-sequence passwd)))
	    (when (and user passwd)
	      (if (funcall loginfunc user passwd)
		  (setq ret t
			sieve-manage-username user)
		(if reason
		    (message "Login failed (reason given: %s)..." reason)
		  (message "Login failed..."))
		(password-cache-remove passwd-key)
		(setq sieve-manage-password nil)
		(setq passwd nil)
		(setq reason nil)
		(sit-for 1))))
	(quit (with-current-buffer buffer
		(password-cache-remove passwd-key)
		(setq user nil
		      passwd nil
		      sieve-manage-password nil)))
	(error (with-current-buffer buffer
		 (password-cache-remove passwd-key)
		 (setq user nil
		       passwd nil
		       sieve-manage-password nil))))
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      ret)))

(defun sieve-manage-erase (&optional p buffer)
  (let ((buffer (or buffer (current-buffer))))
    (and sieve-manage-log
	 (with-current-buffer (get-buffer-create sieve-manage-log)
	   (sieve-manage-disable-multibyte)
	   (buffer-disable-undo)
	   (goto-char (point-max))
	   (insert-buffer-substring buffer (with-current-buffer buffer
					     (point-min))
				    (or p (with-current-buffer buffer
					    (point-max)))))))
  (delete-region (point-min) (or p (point-max))))

(defun sieve-manage-open-1 (buffer)
  (with-current-buffer buffer
    (sieve-manage-erase)
    (setq sieve-manage-state 'initial
	  sieve-manage-process
	  (condition-case ()
	      (funcall (nth 2 (assq sieve-manage-stream
				    sieve-manage-stream-alist))
		       "sieve" buffer sieve-manage-server sieve-manage-port)
	    ((error quit) nil)))
    (when sieve-manage-process
      (while (and (eq sieve-manage-state 'initial)
		  (memq (process-status sieve-manage-process) '(open run)))
	(message "Waiting for response from %s..." sieve-manage-server)
	(accept-process-output sieve-manage-process 1))
      (message "Waiting for response from %s...done" sieve-manage-server)
      (and (memq (process-status sieve-manage-process) '(open run))
	   sieve-manage-process))))

;; Streams

(defun sieve-manage-network-p (buffer)
  t)

(defun sieve-manage-network-open (name buffer server port)
  (let* ((port (or port sieve-manage-default-port))
	 (coding-system-for-read sieve-manage-coding-system-for-read)
	 (coding-system-for-write sieve-manage-coding-system-for-write)
	 (process (open-network-stream name buffer server port)))
    (when process
      (while (and (memq (process-status process) '(open run))
		  (set-buffer buffer) ;; XXX "blue moon" nntp.el bug
		  (goto-char (point-min))
		  (not (sieve-manage-parse-greeting-1)))
	(accept-process-output process 1)
	(sit-for 1))
      (sieve-manage-erase nil buffer)
      (when (memq (process-status process) '(open run))
	process))))

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(defun sieve-manage-starttls-p (buffer)
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  (condition-case ()
      (progn
	(require 'starttls)
	(call-process "starttls"))
    (error nil)))

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(defun sieve-manage-starttls-open (name buffer server port)
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  (let* ((port (or port sieve-manage-default-port))
	 (coding-system-for-read sieve-manage-coding-system-for-read)
	 (coding-system-for-write sieve-manage-coding-system-for-write)
	 (process (starttls-open-stream name buffer server port))
	 done)
    (when process
      (while (and (memq (process-status process) '(open run))
		  (set-buffer buffer) ;; XXX "blue moon" nntp.el bug
		  (goto-char (point-min))
		  (not (sieve-manage-parse-greeting-1)))
	(accept-process-output process 1)
	(sit-for 1))
      (sieve-manage-erase nil buffer)
      (sieve-manage-send "STARTTLS")
      (starttls-negotiate process))
    (when (memq (process-status process) '(open run))
      process)))

;; Authenticators

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(defun sieve-sasl-auth (buffer mech)
  "Login to server using the SASL MECH method."
  (message "sieve: Authenticating using %s..." mech)
  (if (sieve-manage-interactive-login 
       buffer
       (lambda (user passwd)
	 (let (client step tag data rsp)
	   (setq client (sasl-make-client (sasl-find-mechanism (list mech))
					  user "sieve" sieve-manage-server))
	   (setq sasl-read-passphrase (function (lambda (prompt) passwd)))
	   (setq step (sasl-next-step client nil))
	   (setq tag
		 (sieve-manage-send
		  (concat
		   "AUTHENTICATE \""
		   mech
		   "\""
		   (and (sasl-step-data step)
			(concat
			 " \""
			 (base64-encode-string
			  (sasl-step-data step)
			  'no-line-break)
			 "\"")))))
	   (catch 'done
	     (while t
	       (setq rsp nil)
	       (goto-char (point-min))
	       (while (null (or (progn
				  (setq rsp (sieve-manage-is-string))
				  (if (not (and rsp (looking-at
						     sieve-manage-server-eol)))
				      (setq rsp nil)
				    (goto-char (match-end 0))
				    rsp))
				(setq rsp (sieve-manage-is-okno))))
		 (accept-process-output sieve-manage-process 1)
		 (goto-char (point-min)))
	       (sieve-manage-erase)
	       (when (sieve-manage-ok-p rsp)
		 (when (string-match "^SASL \"\\([^\"]+\\)\"" (cadr rsp))
		   (sasl-step-set-data
		    step (base64-decode-string (match-string 1 (cadr rsp)))))
		 (if (and (setq step (sasl-next-step client step))
			  (setq data (sasl-step-data step)))
		     ;; We got data for server but it's finished
		     (error "Server not ready for SASL data: %s" data)
		   ;; The authentication process is finished.
		   (throw 'done t)))
	       (unless (stringp rsp)
		 (apply 'error "Server aborted SASL authentication: %s %s %s"
			rsp))
	       (sasl-step-set-data step (base64-decode-string rsp))
	       (setq step (sasl-next-step client step))
	       (sieve-manage-send
		(if (sasl-step-data step)
		    (concat "\""
			    (base64-encode-string (sasl-step-data step)
						  'no-line-break)
			    "\"")
		  "")))))))
      (message "sieve: Authenticating using %s...done" mech)
    (message "sieve: Authenticating using %s...failed" mech)))

(defun sieve-manage-cram-md5-p (buffer)
  (sieve-manage-capability "SASL" "CRAM-MD5" buffer))

(defun sieve-manage-cram-md5-auth (buffer)
  "Login to managesieve server using the CRAM-MD5 SASL method."
  (sieve-sasl-auth buffer "CRAM-MD5"))

(defun sieve-manage-digest-md5-p (buffer)
  (sieve-manage-capability "SASL" "DIGEST-MD5" buffer))

(defun sieve-manage-digest-md5-auth (buffer)
  "Login to managesieve server using the DIGEST-MD5 SASL method."
  (sieve-sasl-auth buffer "DIGEST-MD5"))

(defun sieve-manage-scram-md5-p (buffer)
  (sieve-manage-capability "SASL" "SCRAM-MD5" buffer))

(defun sieve-manage-scram-md5-auth (buffer)
  "Login to managesieve server using the SCRAM-MD5 SASL method."
  (sieve-sasl-auth buffer "SCRAM-MD5"))

(defun sieve-manage-ntlm-p (buffer)
  (sieve-manage-capability "SASL" "NTLM" buffer))

(defun sieve-manage-ntlm-auth (buffer)
  "Login to managesieve server using the NTLM SASL method."
  (sieve-sasl-auth buffer "NTLM"))

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(defun sieve-manage-plain-p (buffer)
  (sieve-manage-capability "SASL" "PLAIN" buffer))

(defun sieve-manage-plain-auth (buffer)
  "Login to managesieve server using the PLAIN SASL method."
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  (sieve-sasl-auth buffer "PLAIN"))
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(defun sieve-manage-login-p (buffer)
  (sieve-manage-capability "SASL" "LOGIN" buffer))
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(defun sieve-manage-login-auth (buffer)
  "Login to managesieve server using the LOGIN SASL method."
  (sieve-sasl-auth buffer "LOGIN"))
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;; Managesieve API

(defun sieve-manage-open (server &optional port stream auth buffer)
  "Open a network connection to a managesieve SERVER (string).
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Optional argument PORT is port number (integer) on remote server.
Optional argument STREAM is any of `sieve-manage-streams' (a symbol).
Optional argument AUTH indicates authenticator to use, see
`sieve-manage-authenticators' for available authenticators.
If nil, chooses the best stream the server is capable of.
Optional argument BUFFER is buffer (buffer, or string naming buffer)
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to work in."
  (setq buffer (or buffer (format " *sieve* %s:%d" server (or port 2000))))
  (with-current-buffer (get-buffer-create buffer)
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    (mapc 'make-local-variable sieve-manage-local-variables)
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    (sieve-manage-disable-multibyte)
    (buffer-disable-undo)
    (setq sieve-manage-server (or server sieve-manage-server))
    (setq sieve-manage-port (or port sieve-manage-port))
    (setq sieve-manage-stream (or stream sieve-manage-stream))
    (message "sieve: Connecting to %s..." sieve-manage-server)
    (if (let ((sieve-manage-stream
	       (or sieve-manage-stream sieve-manage-default-stream)))
	  (sieve-manage-open-1 buffer))
	;; Choose stream.
	(let (stream-changed)
	  (message "sieve: Connecting to %s...done" sieve-manage-server)
	  (when (null sieve-manage-stream)
	    (let ((streams sieve-manage-streams))
	      (while (setq stream (pop streams))
		(if (funcall (nth 1 (assq stream
					  sieve-manage-stream-alist)) buffer)
		    (setq stream-changed
			  (not (eq (or sieve-manage-stream
				       sieve-manage-default-stream)
				   stream))
			  sieve-manage-stream stream
			  streams nil)))
	      (unless sieve-manage-stream
		(error "Couldn't figure out a stream for server"))))
	  (when stream-changed
	    (message "sieve: Reconnecting with stream `%s'..."
		     sieve-manage-stream)
	    (sieve-manage-close buffer)
	    (if (sieve-manage-open-1 buffer)
		(message "sieve: Reconnecting with stream `%s'...done"
			 sieve-manage-stream)
	      (message "sieve: Reconnecting with stream `%s'...failed"
		       sieve-manage-stream))
	    (setq sieve-manage-capability nil))
	  (if (sieve-manage-opened buffer)
	      ;; Choose authenticator
	      (when (and (null sieve-manage-auth)
			 (not (eq sieve-manage-state 'auth)))
		(let ((auths sieve-manage-authenticators))
		  (while (setq auth (pop auths))
		    (if (funcall (nth 1 (assq
					 auth
					 sieve-manage-authenticator-alist))
				 buffer)
			(setq sieve-manage-auth auth
			      auths nil)))
		  (unless sieve-manage-auth
		    (error "Couldn't figure out authenticator for server"))))))
      (message "sieve: Connecting to %s...failed" sieve-manage-server))
    (when (sieve-manage-opened buffer)
      (sieve-manage-erase)
      buffer)))

(defun sieve-manage-opened (&optional buffer)
  "Return non-nil if connection to managesieve server in BUFFER is open.
If BUFFER is nil then the current buffer is used."
  (and (setq buffer (get-buffer (or buffer (current-buffer))))
       (buffer-live-p buffer)
       (with-current-buffer buffer
	 (and sieve-manage-process
	      (memq (process-status sieve-manage-process) '(open run))))))

(defun sieve-manage-close (&optional buffer)
  "Close connection to managesieve server in BUFFER.
If BUFFER is nil, the current buffer is used."
  (with-current-buffer (or buffer (current-buffer))
    (when (sieve-manage-opened)
      (sieve-manage-send "LOGOUT")
      (sit-for 1))
    (when (and sieve-manage-process
	       (memq (process-status sieve-manage-process) '(open run)))
      (delete-process sieve-manage-process))
    (setq sieve-manage-process nil)
    (sieve-manage-erase)
    t))

(defun sieve-manage-authenticate (&optional user passwd buffer)
  "Authenticate to server in BUFFER, using current buffer if nil.
It uses the authenticator specified when opening the server.  If the
authenticator requires username/passwords, they are queried from the
user and optionally stored in the buffer.  If USER and/or PASSWD is
specified, the user will not be questioned and the username and/or
password is remembered in the buffer."
  (with-current-buffer (or buffer (current-buffer))
    (if (not (eq sieve-manage-state 'nonauth))
	(eq sieve-manage-state 'auth)
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      (make-local-variable 'sieve-manage-username)
      (make-local-variable 'sieve-manage-password)
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      (if user (setq sieve-manage-username user))
      (if passwd (setq sieve-manage-password passwd))
      (if (funcall (nth 2 (assq sieve-manage-auth
				sieve-manage-authenticator-alist)) buffer)
	  (setq sieve-manage-state 'auth)))))

(defun sieve-manage-capability (&optional name value buffer)
  (with-current-buffer (or buffer (current-buffer))
    (if (null name)
	sieve-manage-capability
      (if (null value)
	  (nth 1 (assoc name sieve-manage-capability))
	(when (string-match value (nth 1 (assoc name sieve-manage-capability)))
	  (nth 1 (assoc name sieve-manage-capability)))))))

(defun sieve-manage-listscripts (&optional buffer)
  (with-current-buffer (or buffer (current-buffer))
    (sieve-manage-send "LISTSCRIPTS")
    (sieve-manage-parse-listscripts)))

(defun sieve-manage-havespace (name size &optional buffer)
  (with-current-buffer (or buffer (current-buffer))
    (sieve-manage-send (format "HAVESPACE \"%s\" %s" name size))
    (sieve-manage-parse-okno)))

(defun sieve-manage-putscript (name content &optional buffer)
  (with-current-buffer (or buffer (current-buffer))
    (sieve-manage-send (format "PUTSCRIPT \"%s\" {%d+}%s%s" name
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                               ;; Here we assume that the coding-system will
                               ;; replace each char with a single byte.
                               ;; This is always the case if `content' is
                               ;; a unibyte string.
			       (length content)
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			       sieve-manage-client-eol content))
    (sieve-manage-parse-okno)))

(defun sieve-manage-deletescript (name &optional buffer)
  (with-current-buffer (or buffer (current-buffer))
    (sieve-manage-send (format "DELETESCRIPT \"%s\"" name))
    (sieve-manage-parse-okno)))

(defun sieve-manage-getscript (name output-buffer &optional buffer)
  (with-current-buffer (or buffer (current-buffer))
    (sieve-manage-send (format "GETSCRIPT \"%s\"" name))
    (let ((script (sieve-manage-parse-string)))
      (sieve-manage-parse-crlf)
      (with-current-buffer output-buffer
	(insert script))
      (sieve-manage-parse-okno))))

(defun sieve-manage-setactive (name &optional buffer)
  (with-current-buffer (or buffer (current-buffer))
    (sieve-manage-send (format "SETACTIVE \"%s\"" name))
    (sieve-manage-parse-okno)))

;; Protocol parsing routines

(defun sieve-manage-ok-p (rsp)
  (string= (downcase (or (car-safe rsp) "")) "ok"))

(defsubst sieve-manage-forward ()
  (or (eobp) (forward-char)))

(defun sieve-manage-is-okno ()
  (when (looking-at (concat
		     "^\\(OK\\|NO\\)\\( (\\([^)]+\\))\\)?\\( \\(.*\\)\\)?"
		     sieve-manage-server-eol))
    (let ((status (match-string 1))
	  (resp-code (match-string 3))
	  (response (match-string 5)))
      (when response
	(goto-char (match-beginning 5))
	(setq response (sieve-manage-is-string)))
      (list status resp-code response))))

(defun sieve-manage-parse-okno ()
  (let (rsp)
    (while (null rsp)
      (accept-process-output (get-buffer-process (current-buffer)) 1)
      (goto-char (point-min))
      (setq rsp (sieve-manage-is-okno)))
    (sieve-manage-erase)
    rsp))

(defun sieve-manage-parse-capability-1 ()
  "Accept a managesieve greeting."
  (let (str)
    (while (setq str (sieve-manage-is-string))
      (if (eq (char-after) ? )
	  (progn
	    (sieve-manage-forward)
	    (push (list str (sieve-manage-is-string))
		  sieve-manage-capability))
	(push (list str) sieve-manage-capability))
      (forward-line)))
  (when (re-search-forward (concat "^OK" sieve-manage-server-eol) nil t)
    (setq sieve-manage-state 'nonauth)))

(defalias 'sieve-manage-parse-greeting-1 'sieve-manage-parse-capability-1)

(defun sieve-manage-is-string ()
  (cond ((looking-at "\"\\([^\"]+\\)\"")
	 (prog1
	     (match-string 1)
	   (goto-char (match-end 0))))
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	((looking-at (concat "{\\([0-9]+\\+?\\)}" sieve-manage-server-eol))
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	 (let ((pos (match-end 0))
	       (len (string-to-number (match-string 1))))
	   (if (< (point-max) (+ pos len))
	       nil
	     (goto-char (+ pos len))
	     (buffer-substring pos (+ pos len)))))))

(defun sieve-manage-parse-string ()
  (let (rsp)
    (while (null rsp)
      (accept-process-output (get-buffer-process (current-buffer)) 1)
      (goto-char (point-min))
      (setq rsp (sieve-manage-is-string)))
    (sieve-manage-erase (point))
    rsp))

(defun sieve-manage-parse-crlf ()
  (when (looking-at sieve-manage-server-eol)
    (sieve-manage-erase (match-end 0))))

(defun sieve-manage-parse-listscripts ()
  (let (tmp rsp data)
    (while (null rsp)
      (while (null (or (setq rsp (sieve-manage-is-okno))
		       (setq tmp (sieve-manage-is-string))))
	(accept-process-output (get-buffer-process (current-buffer)) 1)
	(goto-char (point-min)))
      (when tmp
	(while (not (looking-at (concat "\\( ACTIVE\\)?"
					sieve-manage-server-eol)))
	  (accept-process-output (get-buffer-process (current-buffer)) 1)
	  (goto-char (point-min)))
	(if (match-string 1)
	    (push (cons 'active tmp) data)
	  (push tmp data))
	(goto-char (match-end 0))
	(setq tmp nil)))
    (sieve-manage-erase)
    (if (sieve-manage-ok-p rsp)
	data
      rsp)))

(defun sieve-manage-send (cmdstr)
  (setq cmdstr (concat cmdstr sieve-manage-client-eol))
  (and sieve-manage-log
       (with-current-buffer (get-buffer-create sieve-manage-log)
	 (sieve-manage-disable-multibyte)
	 (buffer-disable-undo)
	 (goto-char (point-max))
	 (insert cmdstr)))
  (process-send-string sieve-manage-process cmdstr))

(provide 'sieve-manage)

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;; arch-tag: 321c4640-1371-4495-9baf-8ccb71dd5bd1
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;; sieve-manage.el ends here