Copy plugins into 0.4.1 release branch

2 files changed, 2170 insertions, 0 deletions

diff --git a/plugins/managesieve/lib/Net/Sieve.php b/plugins/managesieve/lib/Net/Sieve.php
new file mode 100644
index 000000000..ecc907194
--- /dev/null
+++ b/plugins/managesieve/lib/Net/Sieve.php
@@ -0,0 +1,1211 @@
+<?php
+/**
+ * This file contains the Net_Sieve class.
+ *
+ * PHP version 4
+ *
+ * +-----------------------------------------------------------------------+
+ * | All rights reserved.                                                  |
+ * |                                                                       |
+ * | Redistribution and use in source and binary forms, with or without    |
+ * | modification, are permitted provided that the following conditions    |
+ * | are met:                                                              |
+ * |                                                                       |
+ * | o Redistributions of source code must retain the above copyright      |
+ * |   notice, this list of conditions and the following disclaimer.       |
+ * | o Redistributions in binary form must reproduce the above copyright   |
+ * |   notice, this list of conditions and the following disclaimer in the |
+ * |   documentation and/or other materials provided with the distribution.|
+ * |                                                                       |
+ * | THIS SOFTWARE IS PROVIDED BY THE COPYRIGHT HOLDERS AND CONTRIBUTORS   |
+ * | "AS IS" AND ANY EXPRESS OR IMPLIED WARRANTIES, INCLUDING, BUT NOT     |
+ * | LIMITED TO, THE IMPLIED WARRANTIES OF MERCHANTABILITY AND FITNESS FOR |
+ * | A PARTICULAR PURPOSE ARE DISCLAIMED. IN NO EVENT SHALL THE COPYRIGHT  |
+ * | OWNER OR CONTRIBUTORS BE LIABLE FOR ANY DIRECT, INDIRECT, INCIDENTAL, |
+ * | SPECIAL, EXEMPLARY, OR CONSEQUENTIAL DAMAGES (INCLUDING, BUT NOT      |
+ * | LIMITED TO, PROCUREMENT OF SUBSTITUTE GOODS OR SERVICES; LOSS OF USE, |
+ * | DATA, OR PROFITS; OR BUSINESS INTERRUPTION) HOWEVER CAUSED AND ON ANY |
+ * | THEORY OF LIABILITY, WHETHER IN CONTRACT, STRICT LIABILITY, OR TORT   |
+ * | (INCLUDING NEGLIGENCE OR OTHERWISE) ARISING IN ANY WAY OUT OF THE USE |
+ * | OF THIS SOFTWARE, EVEN IF ADVISED OF THE POSSIBILITY OF SUCH DAMAGE.  |
+ * +-----------------------------------------------------------------------+
+ *
+ * @category  Networking
+ * @package   Net_Sieve
+ * @author    Richard Heyes <richard@phpguru.org>
+ * @author    Damian Fernandez Sosa <damlists@cnba.uba.ar>
+ * @author    Anish Mistry <amistry@am-productions.biz>
+ * @author    Jan Schneider <jan@horde.org>
+ * @copyright 2002-2003 Richard Heyes
+ * @copyright 2006-2008 Anish Mistry
+ * @license   http://www.opensource.org/licenses/bsd-license.php BSD
+ * @version   SVN: $Id: Sieve.php 300898 2010-07-01 09:49:02Z yunosh $
+ * @link      http://pear.php.net/package/Net_Sieve
+ */
+
+require_once 'PEAR.php';
+require_once 'Net/Socket.php';
+
+/**
+ * TODO
+ *
+ * o supportsAuthMech()
+ */
+
+/**
+ * Disconnected state
+ * @const NET_SIEVE_STATE_DISCONNECTED
+ */
+define('NET_SIEVE_STATE_DISCONNECTED', 1, true);
+
+/**
+ * Authorisation state
+ * @const NET_SIEVE_STATE_AUTHORISATION
+ */
+define('NET_SIEVE_STATE_AUTHORISATION', 2, true);
+
+/**
+ * Transaction state
+ * @const NET_SIEVE_STATE_TRANSACTION
+ */
+define('NET_SIEVE_STATE_TRANSACTION', 3, true);
+
+
+/**
+ * A class for talking to the timsieved server which comes with Cyrus IMAP.
+ *
+ * @category  Networking
+ * @package   Net_Sieve
+ * @author    Richard Heyes <richard@phpguru.org>
+ * @author    Damian Fernandez Sosa <damlists@cnba.uba.ar>
+ * @author    Anish Mistry <amistry@am-productions.biz>
+ * @author    Jan Schneider <jan@horde.org>
+ * @copyright 2002-2003 Richard Heyes
+ * @copyright 2006-2008 Anish Mistry
+ * @license   http://www.opensource.org/licenses/bsd-license.php BSD
+ * @version   Release: 1.3.0
+ * @link      http://pear.php.net/package/Net_Sieve
+ * @link      http://www.ietf.org/rfc/rfc3028.txt RFC 3028 (Sieve: A Mail
+ *            Filtering Language)
+ * @link      http://tools.ietf.org/html/draft-ietf-sieve-managesieve A
+ *            Protocol for Remotely Managing Sieve Scripts
+ */
+class Net_Sieve
+{
+    /**
+     * The authentication methods this class supports.
+     *
+     * Can be overwritten if having problems with certain methods.
+     *
+     * @var array
+     */
+    var $supportedAuthMethods = array('DIGEST-MD5', 'CRAM-MD5', 'EXTERNAL',
+                                      'PLAIN' , 'LOGIN');
+
+    /**
+     * SASL authentication methods that require Auth_SASL.
+     *
+     * @var array
+     */
+    var $supportedSASLAuthMethods = array('DIGEST-MD5', 'CRAM-MD5');
+
+    /**
+     * The socket handle.
+     *
+     * @var resource
+     */
+    var $_sock;
+
+    /**
+     * Parameters and connection information.
+     *
+     * @var array
+     */
+    var $_data;
+
+    /**
+     * Current state of the connection.
+     *
+     * One of the NET_SIEVE_STATE_* constants.
+     *
+     * @var integer
+     */
+    var $_state;
+
+    /**
+     * Constructor error.
+     *
+     * @var PEAR_Error
+     */
+    var $_error;
+
+    /**
+     * Whether to enable debugging.
+     *
+     * @var boolean
+     */
+    var $_debug = false;
+
+    /**
+     * Debug output handler.
+     *
+     * This has to be a valid callback.
+     *
+     * @var string|array
+     */
+    var $_debug_handler = null;
+
+    /**
+     * Whether to pick up an already established connection.
+     *
+     * @var boolean
+     */
+    var $_bypassAuth = false;
+
+    /**
+     * Whether to use TLS if available.
+     *
+     * @var boolean
+     */
+    var $_useTLS = true;
+
+    /**
+     * Additional options for stream_context_create().
+     *
+     * @var array
+     */
+    var $_options = null;
+
+    /**
+     * Maximum number of referral loops
+     *
+     * @var array
+     */
+    var $_maxReferralCount = 15;
+
+    /**
+     * Constructor.
+     *
+     * Sets up the object, connects to the server and logs in. Stores any
+     * generated error in $this->_error, which can be retrieved using the
+     * getError() method.
+     *
+     * @param string  $user       Login username.
+     * @param string  $pass       Login password.
+     * @param string  $host       Hostname of server.
+     * @param string  $port       Port of server.
+     * @param string  $logintype  Type of login to perform (see
+     *                            $supportedAuthMethods).
+     * @param string  $euser      Effective user. If authenticating as an
+     *                            administrator, login as this user.
+     * @param boolean $debug      Whether to enable debugging (@see setDebug()).
+     * @param string  $bypassAuth Skip the authentication phase. Useful if the
+     *                            socket is already open.
+     * @param boolean $useTLS     Use TLS if available.
+     * @param array   $options    Additional options for
+     *                            stream_context_create().
+     * @param mixed   $handler    A callback handler for the debug output.
+     */
+    function Net_Sieve($user = null, $pass  = null, $host = 'localhost',
+                       $port = 2000, $logintype = '', $euser = '',
+                       $debug = false, $bypassAuth = false, $useTLS = true,
+                       $options = null, $handler = null)
+    {
+        $this->_state             = NET_SIEVE_STATE_DISCONNECTED;
+        $this->_data['user']      = $user;
+        $this->_data['pass']      = $pass;
+        $this->_data['host']      = $host;
+        $this->_data['port']      = $port;
+        $this->_data['logintype'] = $logintype;
+        $this->_data['euser']     = $euser;
+        $this->_sock              = new Net_Socket();
+        $this->_bypassAuth        = $bypassAuth;
+        $this->_useTLS            = $useTLS;
+        $this->_options           = $options;
+        $this->setDebug($debug, $handler);
+
+        /* Try to include the Auth_SASL package.  If the package is not
+         * available, we disable the authentication methods that depend upon
+         * it. */
+        if ((@include_once 'Auth/SASL.php') === false) {
+            $this->_debug('Auth_SASL not present');
+            foreach ($this->supportedSASLAuthMethods as $SASLMethod) {
+                $pos = array_search($SASLMethod, $this->supportedAuthMethods);
+                $this->_debug('Disabling method ' . $SASLMethod);
+                unset($this->supportedAuthMethods[$pos]);
+            }
+        }
+
+        if (strlen($user) && strlen($pass)) {
+            $this->_error = $this->_handleConnectAndLogin();
+        }
+    }
+
+    /**
+     * Returns any error that may have been generated in the constructor.
+     *
+     * @return boolean|PEAR_Error  False if no error, PEAR_Error otherwise.
+     */
+    function getError()
+    {
+        return PEAR::isError($this->_error) ? $this->_error : false;
+    }
+
+    /**
+     * Sets the debug state and handler function.
+     *
+     * @param boolean $debug   Whether to enable debugging.
+     * @param string  $handler A custom debug handler. Must be a valid callback.
+     *
+     * @return void
+     */
+    function setDebug($debug = true, $handler = null)
+    {
+        $this->_debug = $debug;
+        $this->_debug_handler = $handler;
+    }
+
+    /**
+     * Connects to the server and logs in.
+     *
+     * @return boolean  True on success, PEAR_Error on failure.
+     */
+    function _handleConnectAndLogin()
+    {
+        if (PEAR::isError($res = $this->connect($this->_data['host'], $this->_data['port'], $this->_options, $this->_useTLS))) {
+            return $res;
+        }
+        if ($this->_bypassAuth === false) {
+            if (PEAR::isError($res = $this->login($this->_data['user'], $this->_data['pass'], $this->_data['logintype'], $this->_data['euser'], $this->_bypassAuth))) {
+                return $res;
+            }
+        }
+        return true;
+    }
+
+    /**
+     * Handles connecting to the server and checks the response validity.
+     *
+     * @param string  $host    Hostname of server.
+     * @param string  $port    Port of server.
+     * @param array   $options List of options to pass to
+     *                         stream_context_create().
+     * @param boolean $useTLS  Use TLS if available.
+     *
+     * @return boolean  True on success, PEAR_Error otherwise.
+     */
+    function connect($host, $port, $options = null, $useTLS = true)
+    {
+        if (NET_SIEVE_STATE_DISCONNECTED != $this->_state) {
+            return PEAR::raiseError('Not currently in DISCONNECTED state', 1);
+        }
+
+        if (PEAR::isError($res = $this->_sock->connect($host, $port, false, 5, $options))) {
+            return $res;
+        }
+
+        if ($this->_bypassAuth) {
+            $this->_state = NET_SIEVE_STATE_TRANSACTION;
+        } else {
+            $this->_state = NET_SIEVE_STATE_AUTHORISATION;
+            if (PEAR::isError($res = $this->_doCmd())) {
+                return $res;
+            }
+        }
+
+        // Explicitly ask for the capabilities in case the connection is
+        // picked up from an existing connection.
+        if (PEAR::isError($res = $this->_cmdCapability())) {
+            return PEAR::raiseError(
+                'Failed to connect, server said: ' . $res->getMessage(), 2
+            );
+        }
+
+        // Check if we can enable TLS via STARTTLS.
+        if ($useTLS && !empty($this->_capability['starttls'])
+            && function_exists('stream_socket_enable_crypto')
+        ) {
+            if (PEAR::isError($res = $this->_startTLS())) {
+                return $res;
+            }
+        }
+
+        return true;
+    }
+
+    /**
+     * Disconnect from the Sieve server.
+     *
+     * @param boolean $sendLogoutCMD Whether to send LOGOUT command before
+     *                               disconnecting.
+     *
+     * @return boolean  True on success, PEAR_Error otherwise.
+     */
+    function disconnect($sendLogoutCMD = true)
+    {
+        return $this->_cmdLogout($sendLogoutCMD);
+    }
+
+    /**
+     * Logs into server.
+     *
+     * @param string  $user       Login username.
+     * @param string  $pass       Login password.
+     * @param string  $logintype  Type of login method to use.
+     * @param string  $euser      Effective UID (perform on behalf of $euser).
+     * @param boolean $bypassAuth Do not perform authentication.
+     *
+     * @return boolean  True on success, PEAR_Error otherwise.
+     */
+    function login($user, $pass, $logintype = null, $euser = '', $bypassAuth = false)
+    {
+        if (NET_SIEVE_STATE_AUTHORISATION != $this->_state) {
+            return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
+        }
+
+        if (!$bypassAuth ) {
+            if (PEAR::isError($res = $this->_cmdAuthenticate($user, $pass, $logintype, $euser))) {
+                return $res;
+            }
+        }
+        $this->_state = NET_SIEVE_STATE_TRANSACTION;
+
+        return true;
+    }
+
+    /**
+     * Returns an indexed array of scripts currently on the server.
+     *
+     * @return array  Indexed array of scriptnames.
+     */
+    function listScripts()
+    {
+        if (is_array($scripts = $this->_cmdListScripts())) {
+            $this->_active = $scripts[1];
+            return $scripts[0];
+        } else {
+            return $scripts;
+        }
+    }
+
+    /**
+     * Returns the active script.
+     *
+     * @return string  The active scriptname.
+     */
+    function getActive()
+    {
+        if (!empty($this->_active)) {
+            return $this->_active;
+        }
+        if (is_array($scripts = $this->_cmdListScripts())) {
+            $this->_active = $scripts[1];
+            return $scripts[1];
+        }
+    }
+
+    /**
+     * Sets the active script.
+     *
+     * @param string $scriptname The name of the script to be set as active.
+     *
+     * @return boolean  True on success, PEAR_Error on failure.
+     */
+    function setActive($scriptname)
+    {
+        return $this->_cmdSetActive($scriptname);
+    }
+
+    /**
+     * Retrieves a script.
+     *
+     * @param string $scriptname The name of the script to be retrieved.
+     *
+     * @return string  The script on success, PEAR_Error on failure.
+    */
+    function getScript($scriptname)
+    {
+        return $this->_cmdGetScript($scriptname);
+    }
+
+    /**
+     * Adds a script to the server.
+     *
+     * @param string  $scriptname Name of the script.
+     * @param string  $script     The script content.
+     * @param boolean $makeactive Whether to make this the active script.
+     *
+     * @return boolean  True on success, PEAR_Error on failure.
+     */
+    function installScript($scriptname, $script, $makeactive = false)
+    {
+        if (PEAR::isError($res = $this->_cmdPutScript($scriptname, $script))) {
+            return $res;
+        }
+        if ($makeactive) {
+            return $this->_cmdSetActive($scriptname);
+        }
+        return true;
+    }
+
+    /**
+     * Removes a script from the server.
+     *
+     * @param string $scriptname Name of the script.
+     *
+     * @return boolean  True on success, PEAR_Error on failure.
+     */
+    function removeScript($scriptname)
+    {
+        return $this->_cmdDeleteScript($scriptname);
+    }
+
+    /**
+     * Checks if the server has space to store the script by the server.
+     *
+     * @param string  $scriptname The name of the script to mark as active.
+     * @param integer $size       The size of the script.
+     *
+     * @return boolean|PEAR_Error  True if there is space, PEAR_Error otherwise.
+     *
+     * @todo Rename to hasSpace()
+     */
+    function haveSpace($scriptname, $size)
+    {
+        if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
+            return PEAR::raiseError('Not currently in TRANSACTION state', 1);
+        }
+        if (PEAR::isError($res = $this->_doCmd(sprintf('HAVESPACE "%s" %d', $scriptname, $size)))) {
+            return $res;
+        }
+        return true;
+    }
+
+    /**
+     * Returns the list of extensions the server supports.
+     *
+     * @return array  List of extensions or PEAR_Error on failure.
+     */
+    function getExtensions()
+    {
+        if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
+            return PEAR::raiseError('Not currently connected', 7);
+        }
+        return $this->_capability['extensions'];
+    }
+
+    /**
+     * Returns whether the server supports an extension.
+     *
+     * @param string $extension The extension to check.
+     *
+     * @return boolean  Whether the extension is supported or PEAR_Error on
+     *                  failure.
+     */
+    function hasExtension($extension)
+    {
+        if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
+            return PEAR::raiseError('Not currently connected', 7);
+        }
+
+        $extension = trim($this->_toUpper($extension));
+        if (is_array($this->_capability['extensions'])) {
+            foreach ($this->_capability['extensions'] as $ext) {
+                if ($ext == $extension) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Returns the list of authentication methods the server supports.
+     *
+     * @return array  List of authentication methods or PEAR_Error on failure.
+     */
+    function getAuthMechs()
+    {
+        if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
+            return PEAR::raiseError('Not currently connected', 7);
+        }
+        return $this->_capability['sasl'];
+    }
+
+    /**
+     * Returns whether the server supports an authentication method.
+     *
+     * @param string $method The method to check.
+     *
+     * @return boolean  Whether the method is supported or PEAR_Error on
+     *                  failure.
+     */
+    function hasAuthMech($method)
+    {
+        if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
+            return PEAR::raiseError('Not currently connected', 7);
+        }
+
+        $method = trim($this->_toUpper($method));
+        if (is_array($this->_capability['sasl'])) {
+            foreach ($this->_capability['sasl'] as $sasl) {
+                if ($sasl == $method) {
+                    return true;
+                }
+            }
+        }
+
+        return false;
+    }
+
+    /**
+     * Handles the authentication using any known method.
+     *
+     * @param string $uid        The userid to authenticate as.
+     * @param string $pwd        The password to authenticate with.
+     * @param string $userMethod The method to use. If empty, the class chooses
+     *                           the best (strongest) available method.
+     * @param string $euser      The effective uid to authenticate as.
+     *
+     * @return void
+     */
+    function _cmdAuthenticate($uid, $pwd, $userMethod = null, $euser = '')
+    {
+        if (PEAR::isError($method = $this->_getBestAuthMethod($userMethod))) {
+            return $method;
+        }
+        switch ($method) {
+        case 'DIGEST-MD5':
+            return $this->_authDigestMD5($uid, $pwd, $euser);
+        case 'CRAM-MD5':
+            $result = $this->_authCRAMMD5($uid, $pwd, $euser);
+            break;
+        case 'LOGIN':
+            $result = $this->_authLOGIN($uid, $pwd, $euser);
+            break;
+        case 'PLAIN':
+            $result = $this->_authPLAIN($uid, $pwd, $euser);
+            break;
+        case 'EXTERNAL':
+            $result = $this->_authEXTERNAL($uid, $pwd, $euser);
+            break;
+        default :
+            $result = PEAR::raiseError(
+                $method . ' is not a supported authentication method'
+            );
+            break;
+        }
+
+        if (PEAR::isError($res = $this->_doCmd())) {
+            return $res;
+        }
+
+        return $result;
+    }
+
+    /**
+     * Authenticates the user using the PLAIN method.
+     *
+     * @param string $user  The userid to authenticate as.
+     * @param string $pass  The password to authenticate with.
+     * @param string $euser The effective uid to authenticate as.
+     *
+     * @return void
+     */
+    function _authPLAIN($user, $pass, $euser)
+    {
+        return $this->_sendCmd(
+            sprintf(
+                'AUTHENTICATE "PLAIN" "%s"',
+                base64_encode($euser . chr(0) . $user . chr(0) . $pass)
+            )
+        );
+    }
+
+    /**
+     * Authenticates the user using the LOGIN method.
+     *
+     * @param string $user  The userid to authenticate as.
+     * @param string $pass  The password to authenticate with.
+     * @param string $euser The effective uid to authenticate as.
+     *
+     * @return void
+     */
+    function _authLOGIN($user, $pass, $euser)
+    {
+        if (PEAR::isError($result = $this->_sendCmd('AUTHENTICATE "LOGIN"'))) {
+            return $result;
+        }
+        if (PEAR::isError($result = $this->_doCmd('"' . base64_encode($user) . '"', true))) {
+            return $result;
+        }
+        return $this->_doCmd('"' . base64_encode($pass) . '"', true);
+    }
+
+    /**
+     * Authenticates the user using the CRAM-MD5 method.
+     *
+     * @param string $user  The userid to authenticate as.
+     * @param string $pass  The password to authenticate with.
+     * @param string $euser The effective uid to authenticate as.
+     *
+     * @return void
+     */
+    function _authCRAMMD5($user, $pass, $euser)
+    {
+        if (PEAR::isError($challenge = $this->_doCmd('AUTHENTICATE "CRAM-MD5"', true))) {
+            return $challenge;
+        }
+
+        $challenge = base64_decode(trim($challenge));
+        $cram = Auth_SASL::factory('crammd5');
+        if (PEAR::isError($response = $cram->getResponse($user, $pass, $challenge))) {
+            return $response;
+        }
+
+        return $this->_sendStringResponse(base64_encode($response));
+    }
+
+    /**
+     * Authenticates the user using the DIGEST-MD5 method.
+     *
+     * @param string $user  The userid to authenticate as.
+     * @param string $pass  The password to authenticate with.
+     * @param string $euser The effective uid to authenticate as.
+     *
+     * @return void
+     */
+    function _authDigestMD5($user, $pass, $euser)
+    {
+        if (PEAR::isError($challenge = $this->_doCmd('AUTHENTICATE "DIGEST-MD5"', true))) {
+            return $challenge;
+        }
+
+        $challenge = base64_decode(trim($challenge));
+        $digest = Auth_SASL::factory('digestmd5');
+        // @todo Really 'localhost'?
+        if (PEAR::isError($response = $digest->getResponse($user, $pass, $challenge, 'localhost', 'sieve', $euser))) {
+            return $response;
+        }
+
+        if (PEAR::isError($result = $this->_sendStringResponse(base64_encode($response)))) {
+            return $result;
+        }
+        if (PEAR::isError($result = $this->_doCmd('', true))) {
+            return $result;
+        }
+        if ($this->_toUpper(substr($result, 0, 2)) == 'OK') {
+            return;
+        }
+
+        /* We don't use the protocol's third step because SIEVE doesn't allow
+         * subsequent authentication, so we just silently ignore it. */
+        if (PEAR::isError($result = $this->_sendStringResponse(''))) {
+            return $result;
+        }
+
+        return $this->_doCmd();
+    }
+
+    /**
+     * Authenticates the user using the EXTERNAL method.
+     *
+     * @param string $user  The userid to authenticate as.
+     * @param string $pass  The password to authenticate with.
+     * @param string $euser The effective uid to authenticate as.
+     *
+     * @return void
+     *
+     * @since  1.1.7
+     */
+    function _authEXTERNAL($user, $pass, $euser)
+    {
+        $cmd = sprintf(
+            'AUTHENTICATE "EXTERNAL" "%s"',
+            base64_encode(strlen($euser) ? $euser : $user)
+        );
+        return $this->_sendCmd($cmd);
+    }
+
+    /**
+     * Removes a script from the server.
+     *
+     * @param string $scriptname Name of the script to delete.
+     *
+     * @return boolean  True on success, PEAR_Error otherwise.
+     */
+    function _cmdDeleteScript($scriptname)
+    {
+        if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
+            return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
+        }
+        if (PEAR::isError($res = $this->_doCmd(sprintf('DELETESCRIPT "%s"', $scriptname)))) {
+            return $res;
+        }
+        return true;
+    }
+
+    /**
+     * Retrieves the contents of the named script.
+     *
+     * @param string $scriptname Name of the script to retrieve.
+     *
+     * @return string  The script if successful, PEAR_Error otherwise.
+     */
+    function _cmdGetScript($scriptname)
+    {
+        if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
+            return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
+        }
+
+        if (PEAR::isError($res = $this->_doCmd(sprintf('GETSCRIPT "%s"', $scriptname)))) {
+            return $res;
+        }
+
+        return preg_replace('/{[0-9]+}\r\n/', '', $res);
+    }
+
+    /**
+     * Sets the active script, i.e. the one that gets run on new mail by the
+     * server.
+     *
+     * @param string $scriptname The name of the script to mark as active.
+     *
+     * @return boolean  True on success, PEAR_Error otherwise.
+    */
+    function _cmdSetActive($scriptname)
+    {
+        if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
+            return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
+        }
+        if (PEAR::isError($res = $this->_doCmd(sprintf('SETACTIVE "%s"', $scriptname)))) {
+            return $res;
+        }
+        $this->_activeScript = $scriptname;
+        return true;
+    }
+
+    /**
+     * Returns the list of scripts on the server.
+     *
+     * @return array  An array with the list of scripts in the first element
+     *                and the active script in the second element on success,
+     *                PEAR_Error otherwise.
+     */
+    function _cmdListScripts()
+    {
+        if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
+            return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
+        }
+
+        if (PEAR::isError($res = $this->_doCmd('LISTSCRIPTS'))) {
+            return $res;
+        }
+
+        $scripts = array();
+        $activescript = null;
+        $res = explode("\r\n", $res);
+        foreach ($res as $value) {
+            if (preg_match('/^"(.*)"( ACTIVE)?$/i', $value, $matches)) {
+                $scripts[] = $matches[1];
+                if (!empty($matches[2])) {
+                    $activescript = $matches[1];
+                }
+            }
+        }
+
+        return array($scripts, $activescript);
+    }
+
+    /**
+     * Adds a script to the server.
+     *
+     * @param string $scriptname Name of the new script.
+     * @param string $scriptdata The new script.
+     *
+     * @return boolean  True on success, PEAR_Error otherwise.
+     */
+    function _cmdPutScript($scriptname, $scriptdata)
+    {
+        if (NET_SIEVE_STATE_TRANSACTION != $this->_state) {
+            return PEAR::raiseError('Not currently in AUTHORISATION state', 1);
+        }
+
+        $stringLength = $this->_getLineLength($scriptdata);
+
+        if (PEAR::isError($res = $this->_doCmd(sprintf("PUTSCRIPT \"%s\" {%d+}\r\n%s", $scriptname, $stringLength, $scriptdata)))) {
+            return $res;
+        }
+
+        return true;
+    }
+
+    /**
+     * Logs out of the server and terminates the connection.
+     *
+     * @param boolean $sendLogoutCMD Whether to send LOGOUT command before
+     *                               disconnecting.
+     *
+     * @return boolean  True on success, PEAR_Error otherwise.
+     */
+    function _cmdLogout($sendLogoutCMD = true)
+    {
+        if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
+            return PEAR::raiseError('Not currently connected', 1);
+        }
+
+        if ($sendLogoutCMD) {
+            if (PEAR::isError($res = $this->_doCmd('LOGOUT'))) {
+                return $res;
+            }
+        }
+
+        $this->_sock->disconnect();
+        $this->_state = NET_SIEVE_STATE_DISCONNECTED;
+
+        return true;
+    }
+
+    /**
+     * Sends the CAPABILITY command
+     *
+     * @return boolean  True on success, PEAR_Error otherwise.
+     */
+    function _cmdCapability()
+    {
+        if (NET_SIEVE_STATE_DISCONNECTED == $this->_state) {
+            return PEAR::raiseError('Not currently connected', 1);
+        }
+        if (PEAR::isError($res = $this->_doCmd('CAPABILITY'))) {
+            return $res;
+        }
+        $this->_parseCapability($res);
+        return true;
+    }
+
+    /**
+     * Parses the response from the CAPABILITY command and stores the result
+     * in $_capability.
+     *
+     * @param string $data The response from the capability command.
+     *
+     * @return void
+     */
+    function _parseCapability($data)
+    {
+        // Clear the cached capabilities.
+        $this->_capability = array('sasl' => array(),
+                                   'extensions' => array());
+
+        $data = preg_split('/\r?\n/', $this->_toUpper($data), -1, PREG_SPLIT_NO_EMPTY);
+
+        for ($i = 0; $i < count($data); $i++) {
+            if (!preg_match('/^"([A-Z]+)"( "(.*)")?$/', $data[$i], $matches)) {
+                continue;
+            }
+            switch ($matches[1]) {
+            case 'IMPLEMENTATION':
+                $this->_capability['implementation'] = $matches[3];
+                break;
+
+            case 'SASL':
+                $this->_capability['sasl'] = preg_split('/\s+/', $matches[3]);
+                break;
+
+            case 'SIEVE':
+                $this->_capability['extensions'] = preg_split('/\s+/', $matches[3]);
+                break;
+
+            case 'STARTTLS':
+                $this->_capability['starttls'] = true;
+                break;
+            }
+        }
+    }
+
+    /**
+     * Sends a command to the server
+     *
+     * @param string $cmd The command to send.
+     *
+     * @return void
+     */
+    function _sendCmd($cmd)
+    {
+        $status = $this->_sock->getStatus();
+        if (PEAR::isError($status) || $status['eof']) {
+            return PEAR::raiseError('Failed to write to socket: connection lost');
+        }
+        if (PEAR::isError($error = $this->_sock->write($cmd . "\r\n"))) {
+            return PEAR::raiseError(
+                'Failed to write to socket: ' . $error->getMessage()
+            );
+        }
+        $this->_debug("C: $cmd");
+    }
+
+    /**
+     * Sends a string response to the server.
+     *
+     * @param string $str The string to send.
+     *
+     * @return void
+     */
+    function _sendStringResponse($str)
+    {
+        return $this->_sendCmd('{' . $this->_getLineLength($str) . "+}\r\n" . $str);
+    }
+
+    /**
+     * Receives a single line from the server.
+     *
+     * @return string  The server response line.
+     */
+    function _recvLn()
+    {
+        if (PEAR::isError($lastline = $this->_sock->gets(8192))) {
+            return PEAR::raiseError(
+                'Failed to read from socket: ' . $lastline->getMessage()
+            );
+        }
+
+        $lastline = rtrim($lastline);
+        $this->_debug("S: $lastline");
+
+        if ($lastline === '') {
+            return PEAR::raiseError('Failed to read from socket');
+        }
+
+        return $lastline;
+    }
+
+    /**
+     * Send a command and retrieves a response from the server.
+     *
+     * @param string $cmd   The command to send.
+     * @param boolean $auth Whether this is an authentication command.
+     *
+     * @return string|PEAR_Error  Reponse string if an OK response, PEAR_Error
+     *                            if a NO response.
+     */
+    function _doCmd($cmd = '', $auth = false)
+    {
+        $referralCount = 0;
+        while ($referralCount < $this->_maxReferralCount) {
+            if (strlen($cmd)) {
+                if (PEAR::isError($error = $this->_sendCmd($cmd))) {
+                    return $error;
+                }
+            }
+
+            $response = '';
+            while (true) {
+                if (PEAR::isError($line = $this->_recvLn())) {
+                    return $line;
+                }
+                $uc_line = $this->_toUpper($line);
+
+                if ('OK' == substr($uc_line, 0, 2)) {
+                    $response .= $line;
+                    return rtrim($response);
+                }
+
+                if ('NO' == substr($uc_line, 0, 2)) {
+                    // Check for string literal error message.
+                    if (preg_match('/^no {([0-9]+)\+?}/i', $line, $matches)) {
+                        $line .= str_replace(
+                            "\r\n", ' ', $this->_sock->read($matches[1] + 2)
+                        );
+                        $this->_debug("S: $line");
+                    }
+                    return PEAR::raiseError(trim($response . substr($line, 2)), 3);
+                }
+
+                if ('BYE' == substr($uc_line, 0, 3)) {
+                    if (PEAR::isError($error = $this->disconnect(false))) {
+                        return PEAR::raiseError(
+                            'Cannot handle BYE, the error was: '
+                            . $error->getMessage(),
+                            4
+                        );
+                    }
+                    // Check for referral, then follow it.  Otherwise, carp an
+                    // error.
+                    if (preg_match('/^bye \(referral "(sieve:\/\/)?([^"]+)/i', $line, $matches)) {
+                        // Replace the old host with the referral host
+                        // preserving any protocol prefix.
+                        $this->_data['host'] = preg_replace(
+                            '/\w+(?!(\w|\:\/\/)).*/', $matches[2],
+                            $this->_data['host']
+                        );
+                        if (PEAR::isError($error = $this->_handleConnectAndLogin())) {
+                            return PEAR::raiseError(
+                                'Cannot follow referral to '
+                                . $this->_data['host'] . ', the error was: '
+                                . $error->getMessage(),
+                                5
+                            );
+                        }
+                        break;
+                    }
+                    return PEAR::raiseError(trim($response . $line), 6);
+                }
+
+                if (preg_match('/^{([0-9]+)\+?}/i', $line, $matches)) {
+                    // Matches String Responses.
+                    $str_size = $matches[1] + 2;
+                    $line = '';
+                    $line_length = 0;
+                    while ($line_length < $str_size) {
+                        $line .= $this->_sock->read($str_size - $line_length);
+                        $line_length = $this->_getLineLength($line);
+                    }
+                    $this->_debug("S: $line");
+
+                    if (!$auth) {
+                        // Receive the pending OK only if we aren't
+                        // authenticating since string responses during
+                        // authentication don't need an OK.
+                        $this->_recvLn();
+                    }
+                    return $line;
+                }
+
+                if ($auth) {
+                    // String responses during authentication don't need an
+                    // OK.
+                    $response .= $line;
+                    return rtrim($response);
+                }
+
+                $response .= $line . "\r\n";
+                $referralCount++;
+            }
+        }
+
+        return PEAR::raiseError('Max referral count (' . $referralCount . ') reached. Cyrus murder loop error?', 7);
+    }
+
+    /**
+     * Returns the name of the best authentication method that the server
+     * has advertised.
+     *
+     * @param string $userMethod Only consider this method as available.
+     *
+     * @return string  The name of the best supported authentication method or
+     *                 a PEAR_Error object on failure.
+     */
+    function _getBestAuthMethod($userMethod = null)
+    {
+        if (!isset($this->_capability['sasl'])) {
+            return PEAR::raiseError('This server doesn\'t support any authentication methods. SASL problem?');
+        }
+        if (!$this->_capability['sasl']) {
+            return PEAR::raiseError('This server doesn\'t support any authentication methods.');
+        }
+
+        if ($userMethod) {
+            if (in_array($userMethod, $this->_capability['sasl'])) {
+                return $userMethod;
+            }
+            return PEAR::raiseError(
+                sprintf('No supported authentication method found. The server supports these methods: %s, but we want to use: %s',
+                        implode(', ', $this->_capability['sasl']),
+                        $userMethod));
+        }
+
+        foreach ($this->supportedAuthMethods as $method) {
+            if (in_array($method, $this->_capability['sasl'])) {
+                return $method;
+            }
+        }
+
+        return PEAR::raiseError(
+            sprintf('No supported authentication method found. The server supports these methods: %s, but we only support: %s',
+                    implode(', ', $this->_capability['sasl']),
+                    implode(', ', $this->supportedAuthMethods)));
+    }
+
+    /**
+     * Starts a TLS connection.
+     *
+     * @return boolean  True on success, PEAR_Error on failure.
+     */
+    function _startTLS()
+    {
+        if (PEAR::isError($res = $this->_doCmd('STARTTLS'))) {
+            return $res;
+        }
+
+        if (!stream_socket_enable_crypto($this->_sock->fp, true, STREAM_CRYPTO_METHOD_TLS_CLIENT)) {
+            return PEAR::raiseError('Failed to establish TLS connection', 2);
+        }
+
+        $this->_debug('STARTTLS negotiation successful');
+
+        // The server should be sending a CAPABILITY response after
+        // negotiating TLS. Read it, and ignore if it doesn't.
+        $this->_doCmd();
+
+        // RFC says we need to query the server capabilities again now that we
+        // are under encryption.
+        if (PEAR::isError($res = $this->_cmdCapability())) {
+            return PEAR::raiseError(
+                'Failed to connect, server said: ' . $res->getMessage(), 2
+            );
+        }
+
+        return true;
+    }
+
+    /**
+     * Returns the length of a string.
+     *
+     * @param string $string A string.
+     *
+     * @return integer  The length of the string.
+     */
+    function _getLineLength($string)
+    {
+        if (extension_loaded('mbstring')) {
+            return mb_strlen($string, 'latin1');
+        } else {
+            return strlen($string);
+        }
+    }
+
+    /**
+     * Locale independant strtoupper() implementation.
+     *
+     * @param string $string The string to convert to lowercase.
+     *
+     * @return string  The lowercased string, based on ASCII encoding.
+     */
+    function _toUpper($string)
+    {
+        $language = setlocale(LC_CTYPE, 0);
+        setlocale(LC_CTYPE, 'C');
+        $string = strtoupper($string);
+        setlocale(LC_CTYPE, $language);
+        return $string;
+    }
+
+    /**
+     * Write debug text to the current debug output handler.
+     *
+     * @param string $message Debug message text.
+     *
+     * @return void
+     */
+    function _debug($message)
+    {
+        if ($this->_debug) {
+            if ($this->_debug_handler) {
+                call_user_func_array($this->_debug_handler, array(&$this, $message));
+            } else {
+                echo "$message\n";
+            }
+        }
+    }
+}
diff --git a/plugins/managesieve/lib/rcube_sieve.php b/plugins/managesieve/lib/rcube_sieve.php
new file mode 100644
index 000000000..926e8a7e0
--- /dev/null
+++ b/plugins/managesieve/lib/rcube_sieve.php
@@ -0,0 +1,959 @@
+<?php
+
+/*
+  Classes for managesieve operations (using PEAR::Net_Sieve)
+
+  Author: Aleksander Machniak <alec@alec.pl>
+
+  $Id$
+
+*/
+
+//  Sieve Language Basics: http://www.ietf.org/rfc/rfc5228.txt
+
+define('SIEVE_ERROR_CONNECTION', 1);
+define('SIEVE_ERROR_LOGIN', 2);
+define('SIEVE_ERROR_NOT_EXISTS', 3);    // script not exists
+define('SIEVE_ERROR_INSTALL', 4);       // script installation
+define('SIEVE_ERROR_ACTIVATE', 5);      // script activation
+define('SIEVE_ERROR_DELETE', 6);        // script deletion
+define('SIEVE_ERROR_INTERNAL', 7);      // internal error
+define('SIEVE_ERROR_DEACTIVATE', 8);    // script activation
+define('SIEVE_ERROR_OTHER', 255);       // other/unknown error
+
+
+class rcube_sieve
+{
+    private $sieve;                 // Net_Sieve object
+    private $error = false;         // error flag
+    private $list = array();        // scripts list
+
+    public $script;                 // rcube_sieve_script object
+    public $current;                // name of currently loaded script
+    private $disabled;              // array of disabled extensions
+
+
+    /**
+     * Object constructor
+     *
+     * @param string  Username (for managesieve login)
+     * @param string  Password (for managesieve login)
+     * @param string  Managesieve server hostname/address
+     * @param string  Managesieve server port number
+     * @param string  Managesieve authentication method 
+     * @param boolean Enable/disable TLS use
+     * @param array   Disabled extensions
+     * @param boolean Enable/disable debugging
+     */
+    public function __construct($username, $password='', $host='localhost', $port=2000,
+        $auth_type=null, $usetls=true, $disabled=array(), $debug=false)
+    {
+        $this->sieve = new Net_Sieve();
+
+        if ($debug) {
+            $this->sieve->setDebug(true, array($this, 'debug_handler'));
+        }
+        if (PEAR::isError($this->sieve->connect($host, $port, NULL, $usetls))) {
+            return $this->_set_error(SIEVE_ERROR_CONNECTION);
+        }
+        if (PEAR::isError($this->sieve->login($username, $password,
+            $auth_type ? strtoupper($auth_type) : null))
+        ) {
+            return $this->_set_error(SIEVE_ERROR_LOGIN);
+        }
+        $this->disabled = $disabled;
+    }
+
+    public function __destruct() {
+        $this->sieve->disconnect();
+    }
+
+    /**
+     * Getter for error code
+     */
+    public function error()
+    {
+        return $this->error ? $this->error : false;
+    }
+
+    /**
+     * Saves current script into server
+     */
+    public function save($name = null)
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        if (!$this->script)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        if (!$name)
+            $name = $this->current;
+
+        $script = $this->script->as_text();
+
+        if (!$script)
+            $script = '/* empty script */';
+
+        if (PEAR::isError($this->sieve->installScript($name, $script)))
+            return $this->_set_error(SIEVE_ERROR_INSTALL);
+
+        return true;
+    }
+
+    /**
+     * Saves text script into server
+     */
+    public function save_script($name, $content = null)
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        if (!$content)
+            $content = '/* empty script */';
+
+        if (PEAR::isError($this->sieve->installScript($name, $content)))
+            return $this->_set_error(SIEVE_ERROR_INSTALL);
+
+        return true;
+    }
+
+    /**
+     * Activates specified script
+     */
+    public function activate($name = null)
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        if (!$name)
+            $name = $this->current;
+
+        if (PEAR::isError($this->sieve->setActive($name)))
+            return $this->_set_error(SIEVE_ERROR_ACTIVATE);
+
+        return true;
+    }
+
+    /**
+     * De-activates specified script
+     */
+    public function deactivate()
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        if (PEAR::isError($this->sieve->setActive('')))
+            return $this->_set_error(SIEVE_ERROR_DEACTIVATE);
+
+        return true;
+    }
+
+    /**
+     * Removes specified script
+     */
+    public function remove($name = null)
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        if (!$name)
+            $name = $this->current;
+
+        // script must be deactivated first
+        if ($name == $this->sieve->getActive())
+            if (PEAR::isError($this->sieve->setActive('')))
+                return $this->_set_error(SIEVE_ERROR_DELETE);
+
+        if (PEAR::isError($this->sieve->removeScript($name)))
+            return $this->_set_error(SIEVE_ERROR_DELETE);
+
+        if ($name == $this->current)
+            $this->current = null;
+
+        return true;
+    }
+
+    /**
+     * Gets list of supported by server Sieve extensions
+     */
+    public function get_extensions()
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        $ext = $this->sieve->getExtensions();
+        // we're working on lower-cased names
+        $ext = array_map('strtolower', (array) $ext);
+
+        if ($this->script) {
+            $supported = $this->script->get_extensions();
+            foreach ($ext as $idx => $ext_name)
+                if (!in_array($ext_name, $supported))
+                    unset($ext[$idx]);
+        }
+
+        return array_values($ext);
+    }
+
+    /**
+     * Gets list of scripts from server
+     */
+    public function get_scripts()
+    {
+        if (!$this->list) {
+
+            if (!$this->sieve)
+                return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+            $this->list = $this->sieve->listScripts();
+
+            if (PEAR::isError($this->list))
+                return $this->_set_error(SIEVE_ERROR_OTHER);
+        }
+
+        return $this->list;
+    }
+
+    /**
+     * Returns active script name
+     */
+    public function get_active()
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        return $this->sieve->getActive();
+    }
+
+    /**
+     * Loads script by name
+     */
+    public function load($name)
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        if ($this->current == $name)
+            return true;
+
+        $script = $this->sieve->getScript($name);
+
+        if (PEAR::isError($script))
+            return $this->_set_error(SIEVE_ERROR_OTHER);
+
+        // try to parse from Roundcube format
+        $this->script = $this->_parse($script);
+
+        $this->current = $name;
+
+        return true;
+    }
+
+    /**
+     * Loads script from text content
+     */
+    public function load_script($script)
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        // try to parse from Roundcube format
+        $this->script = $this->_parse($script);
+    }
+
+    /**
+     * Creates rcube_sieve_script object from text script
+     */
+    private function _parse($txt)
+    {
+        // try to parse from Roundcube format
+        $script = new rcube_sieve_script($txt, $this->disabled);
+
+        // ... else try to import from different formats
+        if (empty($script->content)) {
+            $script = $this->_import_rules($txt);
+            $script = new rcube_sieve_script($script, $this->disabled);
+        }
+
+        // replace all elsif with if+stop, we support only ifs
+        foreach ($script->content as $idx => $rule) {
+            if (!isset($script->content[$idx+1])
+                || preg_match('/^else|elsif$/', $script->content[$idx+1]['type'])) {
+                // 'stop' not found?
+                if (!preg_match('/^(stop|vacation)$/', $rule['actions'][count($rule['actions'])-1]['type'])) {
+                    $script->content[$idx]['actions'][] = array(
+                        'type' => 'stop'
+                    );
+                }
+            }
+        }
+
+        return $script;
+    }
+
+    /**
+     * Gets specified script as text
+     */
+    public function get_script($name)
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        $content = $this->sieve->getScript($name);
+
+        if (PEAR::isError($content))
+            return $this->_set_error(SIEVE_ERROR_OTHER);
+
+        return $content;
+    }
+
+    /**
+     * Creates empty script or copy of other script
+     */
+    public function copy($name, $copy)
+    {
+        if (!$this->sieve)
+            return $this->_set_error(SIEVE_ERROR_INTERNAL);
+
+        if ($copy) {
+            $content = $this->sieve->getScript($copy);
+
+            if (PEAR::isError($content))
+                return $this->_set_error(SIEVE_ERROR_OTHER);
+        }
+
+        return $this->save_script($name, $content);
+    }
+
+    private function _import_rules($script)
+    {
+        $i = 0;
+        $name = array();
+
+        // Squirrelmail (Avelsieve)
+        if ($tokens = preg_split('/(#START_SIEVE_RULE.*END_SIEVE_RULE)\n/', $script, -1, PREG_SPLIT_DELIM_CAPTURE)) {
+            foreach($tokens as $token) {
+                if (preg_match('/^#START_SIEVE_RULE.*/', $token, $matches)) {
+                    $name[$i] = "unnamed rule ".($i+1);
+                    $content .= "# rule:[".$name[$i]."]\n";
+                }
+                elseif (isset($name[$i])) {
+                    // This preg_replace is added because I've found some Avelsieve scripts
+                    // with rules containing "if" here. I'm not sure it was working
+                    // before without this or not.
+                    $token = preg_replace('/^if\s+/', '', trim($token));
+                    $content .= "if $token\n";
+                    $i++;
+                }
+            }
+        }
+        // Horde (INGO)
+        else if ($tokens = preg_split('/(# .+)\r?\n/i', $script, -1, PREG_SPLIT_DELIM_CAPTURE)) {
+            foreach($tokens as $token) {
+                if (preg_match('/^# (.+)/i', $token, $matches)) {
+                    $name[$i] = $matches[1];
+                    $content .= "# rule:[" . $name[$i] . "]\n";
+                }
+                elseif (isset($name[$i])) {
+                    $token = str_replace(":comparator \"i;ascii-casemap\" ", "", $token);
+                    $content .= $token . "\n";
+                    $i++;
+                }
+            }
+        }
+
+        return $content;
+    }
+
+    private function _set_error($error)
+    {
+        $this->error = $error;
+        return false;
+    }
+
+    /**
+     * This is our own debug handler for connection
+     */
+    public function debug_handler(&$sieve, $message)
+    {
+        write_log('sieve', preg_replace('/\r\n$/', '', $message));
+    }
+}
+
+
+class rcube_sieve_script
+{
+    public $content = array();      // script rules array
+
+    private $supported = array(     // extensions supported by class
+        'fileinto',
+        'reject',
+        'ereject',
+        'copy',                     // RFC3894
+        'vacation',                 // RFC5230
+    // TODO: (most wanted first) body, imapflags, notify, regex
+    );
+
+    /**
+     * Object constructor
+     *
+     * @param  string  Script's text content
+     * @param  array   Disabled extensions
+     */
+    public function __construct($script, $disabled=NULL)
+    {
+        if (!empty($disabled))
+            foreach ($disabled as $ext)
+                if (($idx = array_search($ext, $this->supported)) !== false)
+                    unset($this->supported[$idx]);
+
+        $this->content = $this->_parse_text($script);
+    }
+
+    /**
+     * Adds script contents as text to the script array (at the end)
+     *
+     * @param    string    Text script contents
+     */
+    public function add_text($script)
+    {
+        $content = $this->_parse_text($script);
+        $result = false;
+
+        // check existsing script rules names
+        foreach ($this->content as $idx => $elem) {
+            $names[$elem['name']] = $idx;
+        }
+
+        foreach ($content as $elem) {
+            if (!isset($names[$elem['name']])) {
+                array_push($this->content, $elem);
+                $result = true;
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Adds rule to the script (at the end)
+     *
+     * @param string Rule name
+     * @param array  Rule content (as array)
+     */
+    public function add_rule($content)
+    {
+        // TODO: check this->supported
+        array_push($this->content, $content);
+        return sizeof($this->content)-1;
+    }
+
+    public function delete_rule($index)
+    {
+        if(isset($this->content[$index])) {
+            unset($this->content[$index]);
+            return true;
+        }
+        return false;
+    }
+
+    public function size()
+    {
+        return sizeof($this->content);
+    }
+
+    public function update_rule($index, $content)
+    {
+        // TODO: check this->supported
+        if ($this->content[$index]) {
+            $this->content[$index] = $content;
+            return $index;
+        }
+        return false;
+    }
+
+    /**
+     * Returns script as text
+     */
+    public function as_text()
+    {
+        $script = '';
+        $exts = array();
+        $idx = 0;
+
+        // rules
+        foreach ($this->content as $rule) {
+            $extension = '';
+            $tests = array();
+            $i = 0;
+
+            // header
+            $script .= '# rule:[' . $rule['name'] . "]\n";
+
+            // constraints expressions
+            foreach ($rule['tests'] as $test) {
+                $tests[$i] = '';
+                switch ($test['test']) {
+                case 'size':
+                    $tests[$i] .= ($test['not'] ? 'not ' : '');
+                    $tests[$i] .= 'size :' . ($test['type']=='under' ? 'under ' : 'over ') . $test['arg'];
+                    break;
+                case 'true':
+                    $tests[$i] .= ($test['not'] ? 'not true' : 'true');
+                    break;
+                case 'exists':
+                    $tests[$i] .= ($test['not'] ? 'not ' : '');
+                    if (is_array($test['arg']))
+                        $tests[$i] .= 'exists ["' . implode('", "', $this->_escape_string($test['arg'])) . '"]';
+                    else
+                        $tests[$i] .= 'exists "' . $this->_escape_string($test['arg']) . '"';
+                    break;
+                case 'header':
+                    $tests[$i] .= ($test['not'] ? 'not ' : '');
+                    $tests[$i] .= 'header :' . $test['type'];
+                    if (is_array($test['arg1']))
+                        $tests[$i] .= ' ["' . implode('", "', $this->_escape_string($test['arg1'])) . '"]';
+                    else
+                        $tests[$i] .= ' "' . $this->_escape_string($test['arg1']) . '"';
+                    if (is_array($test['arg2']))
+                        $tests[$i] .= ' ["' . implode('", "', $this->_escape_string($test['arg2'])) . '"]';
+                    else
+                        $tests[$i] .= ' "' . $this->_escape_string($test['arg2']) . '"';
+                    break;
+                }
+                $i++;
+            }
+
+//          $script .= ($idx>0 ? 'els' : '').($rule['join'] ? 'if allof (' : 'if anyof (');
+            // disabled rule: if false #....
+            $script .= 'if' . ($rule['disabled'] ? ' false #' : '');
+            $script .= $rule['join'] ? ' allof (' : ' anyof (';
+            if (sizeof($tests) > 1)
+                $script .= implode(", ", $tests);
+            else if (sizeof($tests))
+                $script .= $tests[0];
+            else
+                $script .= 'true';
+            $script .= ")\n{\n";
+
+            // action(s)
+            foreach ($rule['actions'] as $action) {
+                switch ($action['type']) {
+                case 'fileinto':
+                    array_push($exts, 'fileinto');
+                    $script .= "\tfileinto ";
+                    if ($action['copy']) {
+                        $script .= ':copy ';
+                        array_push($exts, 'copy');
+                    }
+                    $script .= "\"" . $this->_escape_string($action['target']) . "\";\n";
+                    break;
+                case 'redirect':
+                    $script .= "\tredirect ";
+                    if ($action['copy']) {
+                        $script .= ':copy ';
+                        array_push($exts, 'copy');
+                    }
+                    $script .= "\"" . $this->_escape_string($action['target']) . "\";\n";
+                    break;
+                case 'reject':
+                case 'ereject':
+                    array_push($exts, $action['type']);
+                    if (strpos($action['target'], "\n")!==false)
+                        $script .= "\t".$action['type']." text:\n" . $action['target'] . "\n.\n;\n";
+                    else
+                        $script .= "\t".$action['type']." \"" . $this->_escape_string($action['target']) . "\";\n";
+                    break;
+                case 'keep':
+                case 'discard':
+                case 'stop':
+                    $script .= "\t" . $action['type'] .";\n";
+                    break;
+                case 'vacation':
+                    array_push($exts, 'vacation');
+                    $script .= "\tvacation";
+                    if ($action['days'])
+                        $script .= " :days " . $action['days'];
+                    if ($action['addresses'])
+                        $script .= " :addresses " . $this->_print_list($action['addresses']);
+                    if ($action['subject'])
+                        $script .= " :subject \"" . $this->_escape_string($action['subject']) . "\"";
+                    if ($action['handle'])
+                        $script .= " :handle \"" . $this->_escape_string($action['handle']) . "\"";
+                    if ($action['from'])
+                        $script .= " :from \"" . $this->_escape_string($action['from']) . "\"";
+                    if ($action['mime'])
+                        $script .= " :mime";
+                    if (strpos($action['reason'], "\n")!==false)
+                        $script .= " text:\n" . $action['reason'] . "\n.\n;\n";
+                    else
+                        $script .= " \"" . $this->_escape_string($action['reason']) . "\";\n";
+                    break;
+                }
+            }
+
+            $script .= "}\n";
+            $idx++;
+        }
+
+        // requires
+        if (!empty($exts))
+            $script = 'require ["' . implode('","', array_unique($exts)) . "\"];\n" . $script;
+
+        return $script;
+    }
+
+    /**
+     * Returns script object
+     *
+     */
+    public function as_array()
+    {
+        return $this->content;
+    }
+
+    /**
+     * Returns array of supported extensions
+     *
+     */
+    public function get_extensions()
+    {
+        return array_values($this->supported);
+    }
+
+    /**
+     * Converts text script to rules array
+     *
+     * @param string Text script
+     */
+    private function _parse_text($script)
+    {
+        $i = 0;
+        $content = array();
+
+        // remove C comments
+        $script = preg_replace('|/\*.*?\*/|sm', '', $script);
+
+        // tokenize rules
+        if ($tokens = preg_split('/(# rule:\[.*\])\r?\n/', $script, -1, PREG_SPLIT_DELIM_CAPTURE)) {
+            foreach($tokens as $token) {
+                if (preg_match('/^# rule:\[(.*)\]/', $token, $matches)) {
+                    $content[$i]['name'] = $matches[1];
+                }
+                else if (isset($content[$i]['name']) && sizeof($content[$i]) == 1) {
+                    if ($rule = $this->_tokenize_rule($token)) {
+                        $content[$i] = array_merge($content[$i], $rule);
+                        $i++;
+                    }
+                    else // unknown rule format
+                        unset($content[$i]);
+                }
+            }
+        }
+
+        return $content;
+    }
+
+    /**
+     * Convert text script fragment to rule object
+     *
+     * @param string Text rule
+     */
+    private function _tokenize_rule($content)
+    {
+        $result = NULL;
+
+        if (preg_match('/^(if|elsif|else)\s+((true|false|not\s+true|allof|anyof|exists|header|not|size)(.*))\s+\{(.*)\}$/sm',
+            trim($content), $matches)) {
+
+            $tests = trim($matches[2]);
+
+            // disabled rule (false + comment): if false #.....
+            if ($matches[3] == 'false') {
+                $tests = preg_replace('/^false\s+#\s+/', '', $tests);
+                $disabled = true;
+            }
+            else
+                $disabled = false;
+
+            list($tests, $join) = $this->_parse_tests($tests);
+            $actions = $this->_parse_actions(trim($matches[5]));
+
+            if ($tests && $actions)
+                $result = array(
+                    'type'     => $matches[1],
+                    'tests'    => $tests,
+                    'actions'  => $actions,
+                    'join'     => $join,
+                    'disabled' => $disabled,
+            );
+        }
+
+        return $result;
+    }
+
+    /**
+     * Parse body of actions section
+     *
+     * @param string Text body
+     * @return array Array of parsed action type/target pairs
+     */
+    private function _parse_actions($content)
+    {
+        $result = NULL;
+
+        // supported actions
+        $patterns[] = '^\s*discard;';
+        $patterns[] = '^\s*keep;';
+        $patterns[] = '^\s*stop;';
+        $patterns[] = '^\s*redirect\s+(.*?[^\\\]);';
+        if (in_array('fileinto', $this->supported))
+            $patterns[] = '^\s*fileinto\s+(.*?[^\\\]);';
+        if (in_array('reject', $this->supported)) {
+            $patterns[] = '^\s*reject\s+text:(.*)\n\.\n;';
+            $patterns[] = '^\s*reject\s+(.*?[^\\\]);';
+            $patterns[] = '^\s*ereject\s+text:(.*)\n\.\n;';
+            $patterns[] = '^\s*ereject\s+(.*?[^\\\]);';
+        }
+        if (in_array('vacation', $this->supported))
+            $patterns[] = '^\s*vacation\s+(.*?[^\\\]);';
+
+        $pattern = '/(' . implode('$)|(', $patterns) . '$)/ms';
+
+        // parse actions body
+        if (preg_match_all($pattern, $content, $mm, PREG_SET_ORDER)) {
+            foreach ($mm as $m) {
+                $content = trim($m[0]);
+
+                if(preg_match('/^(discard|keep|stop)/', $content, $matches)) {
+                    $result[] = array('type' => $matches[1]);
+                }
+                else if(preg_match('/^fileinto/', $content)) {
+                    $target = $m[sizeof($m)-1];
+                    $copy = false;
+                    if (preg_match('/^:copy\s+/', $target)) {
+                        $target = preg_replace('/^:copy\s+/', '', $target);
+                        $copy = true;
+                    }
+                    $result[] = array('type' => 'fileinto', 'copy' => $copy,
+                        'target' => $this->_parse_string($target));
+                }
+                else if(preg_match('/^redirect/', $content)) {
+                    $target = $m[sizeof($m)-1];
+                    $copy = false;
+                    if (preg_match('/^:copy\s+/', $target)) {
+                        $target = preg_replace('/^:copy\s+/', '', $target);
+                        $copy = true;
+                    }
+                    $result[] = array('type' => 'redirect', 'copy' => $copy,
+                        'target' => $this->_parse_string($target));
+                }
+                else if(preg_match('/^(reject|ereject)\s+(.*);$/sm', $content, $matches)) {
+                    $result[] = array('type' => $matches[1], 'target' => $this->_parse_string($matches[2]));
+                }
+                else if(preg_match('/^vacation\s+(.*);$/sm', $content, $matches)) {
+                    $vacation = array('type' => 'vacation');
+
+                    if (preg_match('/:days\s+([0-9]+)/', $content, $vm)) {
+                        $vacation['days'] = $vm[1];
+                        $content = preg_replace('/:days\s+([0-9]+)/', '', $content);
+                    }
+                    if (preg_match('/:subject\s+"(.*?[^\\\])"/', $content, $vm)) {
+                        $vacation['subject'] = $vm[1];
+                        $content = preg_replace('/:subject\s+"(.*?[^\\\])"/', '', $content);
+                    }
+                    if (preg_match('/:addresses\s+\[(.*?[^\\\])\]/', $content, $vm)) {
+                        $vacation['addresses'] = $this->_parse_list($vm[1]);
+                        $content = preg_replace('/:addresses\s+\[(.*?[^\\\])\]/', '', $content);
+                    }
+                    if (preg_match('/:handle\s+"(.*?[^\\\])"/', $content, $vm)) {
+                        $vacation['handle'] = $vm[1];
+                        $content = preg_replace('/:handle\s+"(.*?[^\\\])"/', '', $content);
+                    }
+                    if (preg_match('/:from\s+"(.*?[^\\\])"/', $content, $vm)) {
+                        $vacation['from'] = $vm[1];
+                        $content = preg_replace('/:from\s+"(.*?[^\\\])"/', '', $content);
+                    }
+
+                    $content = preg_replace('/^vacation/', '', $content);
+                    $content = preg_replace('/;$/', '', $content);
+                    $content = trim($content);
+
+                    if (preg_match('/^:mime/', $content, $vm)) {
+                        $vacation['mime'] = true;
+                        $content = preg_replace('/^:mime/', '', $content);
+                    }
+
+                    $vacation['reason'] = $this->_parse_string($content);
+
+                    $result[] = $vacation;
+                }
+            }
+        }
+
+        return $result;
+    }
+
+    /**
+     * Parse test/conditions section
+     *
+     * @param string Text
+     */
+    private function _parse_tests($content)
+    {
+        $result = NULL;
+
+        // lists
+        if (preg_match('/^(allof|anyof)\s+\((.*)\)$/sm', $content, $matches)) {
+            $content = $matches[2];
+            $join = $matches[1]=='allof' ? true : false;
+        }
+        else
+            $join = false;
+
+        // supported tests regular expressions
+        // TODO: comparators, envelope
+        $patterns[] = '(not\s+)?(exists)\s+\[(.*?[^\\\])\]';
+        $patterns[] = '(not\s+)?(exists)\s+(".*?[^\\\]")';
+        $patterns[] = '(not\s+)?(true)';
+        $patterns[] = '(not\s+)?(size)\s+:(under|over)\s+([0-9]+[KGM]{0,1})';
+        $patterns[] = '(not\s+)?(header)\s+:(contains|is|matches)\s+\[(.*?[^\\\]")\]\s+\[(.*?[^\\\]")\]';
+        $patterns[] = '(not\s+)?(header)\s+:(contains|is|matches)\s+(".*?[^\\\]")\s+(".*?[^\\\]")';
+        $patterns[] = '(not\s+)?(header)\s+:(contains|is|matches)\s+\[(.*?[^\\\]")\]\s+(".*?[^\\\]")';
+        $patterns[] = '(not\s+)?(header)\s+:(contains|is|matches)\s+(".*?[^\\\]")\s+\[(.*?[^\\\]")\]';
+
+        // join patterns...
+        $pattern = '/(' . implode(')|(', $patterns) . ')/';
+
+        // ...and parse tests list
+        if (preg_match_all($pattern, $content, $matches, PREG_SET_ORDER)) {
+            foreach ($matches as $match) {
+                $size = sizeof($match);
+
+                if (preg_match('/^(not\s+)?size/', $match[0])) {
+                    $result[] = array(
+                        'test' => 'size',
+                        'not'  => $match[$size-4] ? true : false,
+                        'type' => $match[$size-2], // under/over
+                        'arg'  => $match[$size-1], // value
+                    );
+                }
+                else if (preg_match('/^(not\s+)?header/', $match[0])) {
+                    $result[] = array(
+                        'test' => 'header',
+                        'not'  => $match[$size-5] ? true : false,
+                        'type' => $match[$size-3], // is/contains/matches
+                        'arg1' => $this->_parse_list($match[$size-2]), // header(s)
+                        'arg2' => $this->_parse_list($match[$size-1]), // string(s)
+                    );
+                }
+                else if (preg_match('/^(not\s+)?exists/', $match[0])) {
+                    $result[] = array(
+                        'test' => 'exists',
+                        'not'  => $match[$size-3] ? true : false,
+                        'arg'  => $this->_parse_list($match[$size-1]), // header(s)
+                    );
+                }
+                else if (preg_match('/^(not\s+)?true/', $match[0])) {
+                    $result[] = array(
+                        'test' => 'true',
+                        'not'  => $match[$size-2] ? true : false,
+                    );
+                }
+            }
+        }
+
+        return array($result, $join);
+    }
+
+    /**
+     * Parse string value
+     *
+     * @param string Text
+     */
+    private function _parse_string($content)
+    {
+        $text = '';
+        $content = trim($content);
+
+        if (preg_match('/^text:(.*)\.$/sm', $content, $matches))
+            $text = trim($matches[1]);
+        else if (preg_match('/^"(.*)"$/', $content, $matches))
+            $text = str_replace('\"', '"', $matches[1]);
+
+        return $text;
+    }
+
+    /**
+     * Escape special chars in string value
+     *
+     * @param string Text
+     */
+    private function _escape_string($content)
+    {
+        $replace['/"/'] = '\\"';
+
+        if (is_array($content)) {
+            for ($x=0, $y=sizeof($content); $x<$y; $x++)
+                $content[$x] = preg_replace(array_keys($replace),
+                    array_values($replace), $content[$x]);
+
+            return $content;
+        }
+        else
+            return preg_replace(array_keys($replace), array_values($replace), $content);
+    }
+
+    /**
+     * Parse string or list of strings to string or array of strings
+     *
+     * @param string Text
+     */
+    private function _parse_list($content)
+    {
+        $result = array();
+
+        for ($x=0, $len=strlen($content); $x<$len; $x++) {
+            switch ($content[$x]) {
+            case '\\':
+                $str .= $content[++$x];
+                break;
+            case '"':
+                if (isset($str)) {
+                    $result[] = $str;
+                    unset($str);
+                }
+                else
+                    $str = '';
+                break;
+            default:
+                if(isset($str))
+                    $str .= $content[$x];
+            break;
+            }
+        }
+
+        if (sizeof($result)>1)
+            return $result;
+        else if (sizeof($result) == 1)
+            return $result[0];
+        else
+            return NULL;
+    }
+
+    /**
+     * Convert array of elements to list of strings
+     *
+     * @param string Text
+     */
+    private function _print_list($list)
+    {
+        $list = (array) $list;
+        foreach($list as $idx => $val)
+            $list[$idx] = $this->_escape_string($val);
+
+        return '["' . implode('","', $list) . '"]';
+    }
+}
+